Recording medium transfer apparatus

[0004] 1. Field of the Invention

[0005] This invention relates to a recording medium transfer apparatus, which uses a one-direction motor as a drive source for reciprocally transferring a recording medium, such as a disc or a tape cassette.

[0006] 2. Description of the Prior Art

[0007] In a recording medium transfer apparatus provided in a disc player, a cassette deck and so forth, which uses a motor as a drive source for the loading and unloading of a recording medium, the rotational direction of the motor is usually switched for the loading and the unloading.

[0008] Where a two-direction motor is used, however, a polarity inversion circuit is required, thus leading to increase of manufacturing cost. It is thus desired to use a one-direction motor for reducing the cost of manufacture. If a one-direction motor is to be used as a drive source for the reciprocal transfer of the recording medium, however, a direction change mechanism employing an electromagnet or the like has to be assembled in a power transmission line from the motor to the transfer means. Therefore, the power transmission line is complicated, leading to high price of the mechanical portions.

[0009] In another aspect, if the recording medium transfer speed when taking out a recording medium is high, the recording medium may be forced to get out of a recording medium insertion slot. Accordingly, it is desired that the recording medium transfer speed is high when loading the medium and low when unloading the same. For providing different transfer speeds for the loading and unloading, however, it is necessary to control the motor rotation as such, thus leading to complication of the motor control circuit.

[0010] The present invention seeks to solve the above problems. Specifically, an object of the invention is to provide a recording medium transfer apparatus, which uses a one-direction motor as a drive source, and permits reciprocal transfer of the recording medium without complication of the power transmission line from the motor to transfer means, as well as simple in construction and permitting inexpensive manufacture and easy change in the recording medium transfer speed for the loading and unloading of the recording medium.

[0011] Another object of the invention is to permit the motor to serve as a common motor and be operated as a drive source for other separate process performed subsequent to the transfer of recording medium.

[0012] A further object of the invention is to permit satisfactory setting of the timings of the start and stop of the motor.

[0013] The recording medium transfer apparatus according to the invention comprises a rotation member driven for rotation by a one-direction motor, an idler gear, and a transfer means. The rotation member has a partial gear and a push member, the partial gear being held in mesh with the idler gear only during rotation of the rotation member for a predetermined angle.

[0014] The transfer means has a gear portion in mesh with the idler gear and a contact portion. The transfer means is caused, with its contact portion pushed by the push member, to undergo rocking movement in one direction. After separation of the push member from the contact portion, the transfer means is rocked in the other direction with the partial gear held in mesh without idler gear. The recording medium is thus reciprocally transferred by the transfer means with reciprocal rocking movement thereof caused during one rotation of the rotation member.

[0015] With this arrangement, it is possible to obtain reciprocal transfer of a recording medium by using an inexpensive one-direction motor as a drive source and without complicating the power transmission line from the motor to the transfer means.

[0016] In addition, since different power transmission line from the rotation member to the transfer means are provided for the loading and unloading of the recording medium, it is readily possible without complicating the construction to provide a high transfer speed for the loading and a relatively low transfer speed for the unloading.

[0017] Particularly, the push member has a push portion for pushing the contact portion and arcuate surfaces or holding the contact portion at predetermined positions after separation of the contact portion from the push portion.

[0018] With this arrangement, it is possible, when the invention is applied to, for instance, a disc transfer apparatus of a disc player, to utilize the torque of the rotation member for causing such operation as holding a disc, which has been transferred to a playing portion, with the transfer means held at a predetermined position.

[0019] Furthermore, the timings of starting and stopping the one-direction motor are set as follows. The transfer means is pushed and rocked in one direction by an inserted recording medium. As a result, the motor is started with the contact portion of the transfer means brought to an orbit of rocking of the push member, and stopped after separation of the push member from the contact portion. Also, in response to an operation of unloading the recording medium, the motor is started to bring the partial gear into mesh with the idler gear, and it is stopped when the rotation member has competed one rotation.

[0020] By the above arrangement, the timings of starting and stopping the motor can be set satisfactorily.

[0021] The invention will become more apparent upon a reading of the following detailed specification with reference to the accompanying drawings, in which:

[0022] FIG. 1 is a perspective view showing an embodiment of the disc player according to the invention;

[0023] FIG. 2 is a plan view showing the internal construction of a playing unit in the disc player:

[0024] FIG. 3 is a plan view showing the playing unit;

[0025] FIG. 4 is a left side view showing the internal construction of the playing unit;

[0026] FIG. 5 is a right side view showing the same;

[0027] FIG. 6 is a front view, partly in section, showing the playing unit;

[0028] FIG. 7 is a front view showing the same with a disc loaded therein;

[0029] FIG. 8 is a plan view showing a transfer apparatus;

[0030] FIG. 9 is a view for describing the shapes of end portions of a push-forth and a push-back member and an elastic holding mechanism;

[0031] FIG. 10 is a perspective view showing the relation between the push-back member and a turntable;

[0032] FIG. 11 is a plan view showing the transfer apparatus;

[0033] FIG. 12 is a view similar to FIG. 11 but showing the transfer apparatus in a different state;

[0034] FIG. 13 is a view similar to FIG. 11 but showing the transfer apparatus in a further state;

[0035] FIG. 14 is a perspective view showing the relation between a rotation member and an idler gear;

[0036] FIGS. 15A, 15B, 15C, 15D, and 15E are plan views showing the relation between the push-back member and a holding member;

[0037] FIG. 16 is a side view showing the relationship among the rotation member, the push-back member and a switch;

[0038] FIG. 17 is a fragmentary perspective view showing an elastic holding mechanism;

[0039] FIG. 18 is a view for describing the range of disc, in which the disc can be held by the elastic holding mechanism;

[0040] FIG. 19 is a sectional view showing the relation between the turntable and a clamper;

[0041] FIG. 20 is a perspective view showing a stopper;

[0042] FIGS. 21A, 21B and 21C are elevational views showing the relation between the stopper and a damper supporting member;

[0043] FIG. 22 is a front view showing the relation between a slide and a double insertion prohibit member;

[0044] FIG. 23 is a front view showing the relation between the slide and the double insertion prohibit member;

[0045] FIG. 24 is a view for describing the timings of the start and stop of a one-direction motor;

[0046] FIG. 25 is a plan view showing the disc player with a disc taken out during transfer thereof;

[0047] FIG. 26 is a plan view showing the relation among the push-forth and push-back members and the stopper;

[0048] FIG. 27 is also a plan view showing the relationship among the push-forth and push-back members and the stopper; and

[0049] FIG. 28 is a plan view showing the relationship among the rotation member, the idler gear and the push-forth and push-back members.

[0050] FIG. 1 is a perspective view showing a car-mounted disc player. The disc player has a cabinet 1, which accommodates a playing unit 2 mounted in it via a damper (not shown). The cabinet 1 has a disc insertion slot 3 formed in its front surface.

[0051] FIG. 2 is a plan view showing the disc playing unit in an initial state thereof when a disc D is inserted from the disc insertion slot 3 or in a state when the disc D is pushed back from a playing portion P of the playing unit 2 toward the disc insertion slot 3. FIG. 3 is a plan view showing the disc playing in a state when the disc D is loaded in the playing portion P. As shown in FIGS. 1 and 3, the top of the playing unit 2 is covered by a ceiling plate 2aand a clamper supporting member 4. In FIG. 2, the ceiling member 2aand the clamper supporting member are not shown.

[0052] FIGS. 4 and 5 are a left side and a right side view, respectively, showing the internal construction of the playing unit 2. The playing portion P is disposed in a central part of the playing unit 2, and includes a turntable 5, a damper 6, a motor 7 and a pick-up 8 (see FIG. 2). In the playing unit P, the disc D is held on the turntable 5 by the clamper 6, and the turntable 5, the clamper 6 and the disc D are driven to be rotated in unison with one another by a motor 7 for playing back data recorded in the disc D with the pick-up 8.

[0053] The playing portion P is disposed near the disc insertion slot 3 for playback with the disc D at a position, which is assumed when the entirety of the disc D is inserted slightly from the disc insertion slot 3 (see FIG. 3).

[0054] FIGS. 6 and 7 are front views, partly broken away, of the playing unit 2, which show a state that the disc D is not loaded and also show an initial state that the disc D is inserted, respectively. A passage 9 of disc D continuing from the disc insertion slot 3, is formed in a synthetic resin portion constituting a front end portion of the playing unit 2. The upper wall surface of the passage 9 has upward inclined surface portions 9aadjacent to and extending from the opposite edges of the passage 9. The lower wall surface of the passage 9, on the other hand, has downward inclined surface portions 9bin the like locality.

[0055] As shown in FIGS. 2 and 8, a transfer means 10 is disposed on one side of the passage 9 of the disc D (i.e., left side of the playing unit 2). The transfer means 10 includes a push-forth member 11 disposed near the disc insertion slot 3, a push-back member 12 disposed rearwardly thereto, and a connecting member 13 connecting the push-forth and push-back members 11 and 12 to each other. The push-forth member 11 and the connecting member 13 are elastically made integral by the spring 14 with their facing portions 11aand 13ain contact with each other. The facing portions 11aand 13acan be separated from each other against the force of the spring 14. The push-forth member 11, the connecting member 13 and the spring 14 together constitute a main push member 15.

[0056] A driving means 16 is disposed on the left side in the playing unit 2 and rearwardly of the push-back member 12. The driving means 16 includes a rotation member 17, an idler gear 18 and a one-direction motor 19 as a drive source, and can reciprocally drive the push-back member 12.

[0057] The push-back member 11 and the connecting member 13 are rockably mounted on a common shaft 20a, and the push-back member 12 is rockably mounted on another shaft 20b.

[0058] As shown in FIG. 9, rockable ends of the push-forth and push-back members 11 and 12 have a disc push portion 21, in a V-shaped form when viewed sidewise, and a first disc receiving portion 22a, respectively. As shown in FIG. 8, the push-back member 12 has another disc receiving portion, i.e., a second disc receiving portion 22b, also having a V-shaped form, between the center of its rocking and the first disc receiving member 11 is at a receiving position to receive the insertion of the disc, the disc push portion 21 is at a position near the left end of the disc insertion slot 3, the push-back member 12 is at a waiting position for being in contact with the edge of the disc D inserted from the disc insertion slot 3, and the first and second disc receiving portions 22aand 22bare located above the turntable 5 (FIGS. 8 and 10).

[0059] As shown in FIG. 8, the push-back member 12 has a cam groove 23 formed spirally around the center of its rocking. The connecting member 13 has a cam pin 24, which is received in the cam groove 23, the cam groove 23 and the cam pin 24 thus constituting a cam mechanism 25. The cam groove 23 has an inclined groove portion formed as a separating portion 23aadjacent its end closer to the center of rocking. When the disc D is not inserted, the cam pin 24 is at its position as shown in FIG. 8, near the end of the cam groove 23 closer to the center of rocking of the push-back member 12. When the disc D is inserted to cause rocking of the push-back member 12 rearwardly of the playing unit 2, the cam pin 24 is moved along the cam groove 23 toward the other end thereof, as shown in FIGS. 11 and 12, thereby causing the connecting member 13 to follow the push-back member 12 and rock. When the cam pin 24 is moved to the separating portion 23a, as shown in FIG. 13, the connecting member 13 is slightly pushed back. When the connecting member 13 rocks about the shaft 20a, the push-forth member 11 also rocks about the shaft 20ain unison with the connecting member 13.

[0060] Reference numeral 26 in FIG. 2 designates a disc guide, which is formed such that it is integral with a synthetic resin portion constituting a front end portion of the playing unit 2. An orbit of transfer of the disc D is set with the edge thereof in contact with the disc guide 26.

[0061] As shown in FIG. 8, the push-back member 12 has a gear portion 27, a contact portion 28 and a spiral pressure receiving portion 29, these portions being formed around the center of its rocking.

[0062] As shown in FIG. 14, the rotation member 17 has a spur gear 30 formed in its lower portion and a partial gear 31 formed in its upper or remaining portion and having teeth formed only in an angular range of about 100 degrees. The torque of the motor 19 is transmitted via a worm gear 19amounted on the motor shaft, a worn wheel 32 and a first and a second speed reduction gear 33aand 33bto the spur gear 30. The partial gear 31 can be selectively meshed with the idler gear 18, which in turn is always in mesh with the gear portion 27 of the push-back member 12. The worm wheel 32 and the first and second speed reduction gears 33aand 33bconstitute the driving means 16 together with the rotation member 17 and the idler gear 18.

[0063] As also shown in FIG. 14, from the top surface of the rotation member 17 is projected a push member 35, which has a clamper control cam 34 formed by recessing a portion of its top surface. The rotation member 17 also has a first and a second angular hole 36aand 36bwhich is formed to penetrate the rotation member 17. The push member 35 has a push portion 37 coincident with the radial direction of the rotation member 17 and also a first and a second arcuate surface 38 and 39 continuous in succession from the push portion 37. When the disc D is not inserted, the contact portion 28 of the push-back member 12 is out of the orbit of rocking of the push portion 37, but when the push-back member 12 is pushed by the disc D and caused to rock, it is brought to the orbit of rocking of the push portion 37, as shown in FIG. 11.

[0064] With clockwise rotation of the rotation member 17 caused in this state, the push portion 37 pushes the contact portion 28 of the push-back member 12 and causes rocking thereof rearwardly of the playing unit 2, i.e., in the counterclockwise direction. As the rotation of the rotation member 17 proceeds, the push portion 37 is eventually separated from the contact portion 28, and subsequently the first arcuate surface 38 is brought into contact with the contact portion 28, as shown in FIG. 12. During this time, the push-back member 12 is held at a fixed position. As the rotation of the rotation member 17 further proceeds, the second arcuate surface 39 replaces the first arcuate surface 38 and is brought into contact with the contact portion 28. At this time, the push-back member 12 is again pushed rearwardly. While the second arcuate surface 39 is in contact with the contact portion 28, the push-back member 12 is held at a fixed position.

[0065] As shown in FIG. 8, a push member 40 is rockably mounted by a shaft 40ato the underside of the push-back member 12. The push member 40 has a push pin 40bprovided at its rockable end, and it is always pushed by a spring 41 against the outer periphery of the pressure receiving portion 29 of the push-back member 12.

[0066] As shown in FIGS. 15A to 15E, the pressure receiving portion 29 has a locking portion 29afor being in contact with the push pin 40band thus locking the push-back member 12 at the end position of clockwise rocking, a first pressure receiving surface 29bprogressively more distant from the center of rocking in the clockwise direction from the locking portion 29a, a second pressure receiving surface 29cfor being progressively closer to the center of rocking from the first pressure receiving surface 29b, and an arcuate surface 29espaced apart from the second pressure receiving surface 29cby a step 29d.

[0067] When the push pin 40bis held pushed against the first pressure receiving surface 29b, its pushing force acts to cause clockwise rocking of the push-back member 12. Before the disc insertion, as shown in FIG. 15A, the locking portion 29ais in contact with the push pin 40band thus prohibiting clockwise rocking of the push-back member 12, and the push-back member 12 is held at its initial position by the pushing force of the push pin 40breceived by the locking portion 29a.

[0068] When the disc D is inserted form the disc insertion slot 3, the push-back member 12 is pushed by the disc D and, as shown in FIG. 15B, rocks in the counterclockwise direction while pushing back the push pin 40bwith the first pressure receiving surface 29b.

[0069] When the second pressure receiving surface 29creplaces and is brought into contact with the push pin 40b, as shown in FIG. 15C, the pushing force of the push pin 40bexerted to the second pressure receiving surface 29cacts to cause counterclockwise rocking of the push-back member 12.

[0070] When the push pin 40bis brought from the second pressure receiving surface 29cvia the step 29das shown in FIG. 15D to the arcuate surface 29e, as shown in FIG. 15E, the pushing force of the push pin 40bexerts no rocking force to the push-back member 12 in either direction.

[0071] As shown in FIG. 16, a first switch 42ais disposed below the push-back member 12, and a second switch 42bis disposed below the rotation member 17. In FIG. 16, reference numeral 42 designate a printed circuit board. Although not shown, an ejection switch is further provided, which is operated by the disc unloading operation. These switches are provided for controlling the one-direction motor 19. The first switch 42ais turned on when it is pushed by the pressure receiving portion 29 of the push-back member 12. The second switch 42bis held “off” when it is in the first or second angular hole 36aor 36b, and is turned on when it is detached from the angular hole 36aand 36band pushed by the bottom surface of the rotation member 17.

[0072] As shown in FIGS. 2, 3, 6 and 7, an elastic holding mechanism 43 is provided in the front end portion of the playing unit 2. The elastic holding mechanism 43 is constituted by a pair of elastic retainers 44 disposed symmetrically above and on the opposite sides of the passage 9, auxiliary springs 44a(see FIG. 17) for downwardly biasing the retainers 44, and the inclined surfaces 9aof the bottom wall surface of the passage 9. The pair elastic retainers 44 are formed to be integral with a synthetic resin portion as a front end portion of the playing unit 2. As shown in FIG. 17, each inclined surface 9ahas a recess 45 (only left side one being shown) formed at a position corresponding to the free end of each elastic retainer 44 to increase the flexing extent thereof.

[0073] The pair elastic retainers 44 are held within the passage 9 of the disc D with their lower surfaces inclined relative to the plane of the disc D. When the disc D is inserted from the disc insertion slot 3, the elastic retainers 44 have their lower surfaces raised by the edge of the disc D, thus permitting the disc D to enter the space between them and the inclined surface portions 9a. When the disc D reaches a playing position, as shown in FIG. 3, it is spaced apart form the elastic retainers 44 and the inclined surfaces 9a.

[0074] As shown in FIG. 2, the elastic holding mechanism 43 serves to elastically hold a portion of the disc D on the outer side of the recording area lest the disc D so that the disc D does not get out from the disc insertion slot 3 to the outside when the disc D is pushed back by the transfer means 10 from the playing portion P toward the disc insertion slot 3.

[0075] In order that the disc D can be readily taken out with a hand, the extent of push-back of the disc D by the push-back member 12 is desirably set to be as great as possible. When the disc D is pushed back by the push-back member 12 to a position, at which the center hole of the disc D at least partly projects from the disc insertion hole 3, the disc D can be readily taken out by holding its portion on the inner side of the recording area from both the upper and lower sides with fingers. As shown in FIG. 2, with an arrangement that the disc D is pushed back up to a position, at which the center hole of the disc D fully projects from the disc insertion slot 3, the disc D can be readily taken out by inserting fingers into the center hole.

[0076] The disposing position of the elastic holding mechanism 43 is restricted. That is, the elastic holding mechanism 43 should be disposed at a position that the disc D can be held at the position thereof reached when pushed back by the transfer means 10, while being out of contact with the disc during playback and also out of contact with the recording area of the disc during the disc transfer. Referring to FIG. 18, shown coarsely shaded is passage of the recording area of the disc D, and the range of the disc that can be held is on the outside of the coarsely shaded area as finely shaded. Thus, with the elastic retainers 44 formed such that their lower surfaces are inclined relative to the plane of the disc D for holding the edge of the disc D pushed back by the transfer means, the scope be increased, thus increasing the degree of freedom of design.

[0077] As shown in FIG. 2 to FIG. 7, a lower guide piece 46 is provided on the lower wall surface of the passage 9 of the disc D, and a left and a right upper guide pieces 47 are provided on the ceiling plate 2abetween the disc insertion slot 3 and the turntable 5. The disc D inserted form the disc insertion slot 3 is thus led through the space between the lower guide piece 46 and the upper guide piece 47 to the space between the turntable 5 and the clamper 6.

[0078] As shown in FIGS. 4 and 5, the clamper supporting member 4 is mounted by a horizontal shaft 48 in the rearmost portion of the playing unit 2. The clamper 6 can be moved vertically by causing vertical rocking of the damper supporting member 4. The clamper supporting member 4 has a cam contact portion 49 depending from its lower surface. As shown in FIG. 3, the cam contact portion 49 is always biased by a pair of springs 50 to be in contact with the top surface of the rotation member 17.

[0079] When the cam contact portion 49 is brought into contact with the damper control cam 34 with rotation of the rotation member 17, the clamper supporting member 4 is caused to rock downward. As a result, the clamper 6 is lowered and comes to hold the disc D on the turntable 5. In this state, the turntable 5 can be rotated for playing back data with the pick-up 8.

[0080] As shown in FIG. 19, the turntable 5 has a center boss 51 having a center hole, in which the shaft of the motor 7 is fitted, an annular projection 52 formed around the boss 51, and a disc holding surface 53 formed on the outer periphery of the top surface. The boss 51 and the annular projection 52 do not project upward from the disc holding surface 53. Thus, the disc D can be transferred from the disc insertion slot 3 to the playing portion without being obstructed by the boss 51 or annular projection 52. That is, the disc D can be transferred horizontally at a level very close to the disc holding surface 53. After the disc D has been transferred to its set position on the turntable 5, it can be held on the disc supporting surface 53 by merely lowering the clamper 6.

[0081] The clamper 6 has a flange portion 54 for pushing the disc D on the disc holding surface 53 and an annular projection 55 for being fitted on the boss 51. The annular projection 55 has a circular small recess 56, in which the annular projection 52 is to be fitted. The turntable 5 and the clamper 6 are centered to each other by the engagement between the outer periphery of the boss 51 and the inner periphery of the annular projection 55. In addition, the turntable 5, the clamper 6 and the disc D are centered to one another by fitting the annular projection 55 in the center hole of the disc D.

[0082] As shown in FIG. 2, in a right side part of the playing unit 2 a stopper 57 is mounted on a shaft 58 for horizontal rocking thereabout. As shown in FIG. 20, the stopper 57 has a disc receiving portion 59 provided at one end, having a V-shaped form, and also an engagement pin 60 provided at the other end, and it is biased for rocking in the counterclockwise direction by a torsion spring 61. The stopper 57 has an upwardly projecting preventing portion 62 formed between the disc receiving portion 59 and the center of rocking. The preventing portion 62 terminates in a downwardly inclined surface, which serves as a sliding contact portion 63.

[0083] As shown in FIG. 5, the clamper supporting member 4 has a downwardly extending engagement portion 64 provided on one side. The engagement portion 64 is movable along a line of movement as the damper supporting member 4 rocks. The stopper 57 is located beneath the engagement portion 64 so as to be selectively positioned on the line of movement of the engagement portion 64. The stopper 57 is normally at a position as shown in FIG. 2. In this state, the preventing portion 62 is located under the engagement portion 64 as shown in FIG. 21A and prohibiting downward rocking of the clamper supporting member 4. When the disc D is inserted and reaches the position to be held on the turntable 5, the disc receiving portion 59 is pushed by the edge of the disc D, thus causing rocking of the stopper 57 to an approach allowable position. As shown in FIG. 21B, the preventing portion 62 is caused to depart from its position under the engagement portion 64, and the sliding contact portion 63 replaces the preventing portion 62 and is brought to the position under the engagement portion 64, so that the clamper supporting member 4 becomes ready to rock downward. When the damper supporting member 4 rocks downward, the engagement portion 64 is brought into contact with the sliding contact portion 63 and causes further clockwise rocking of the stopper 57, thus bringing the disc receiving portion 59 to a retreated position spaced apart from the edge of the disc D, as shown in FIG. 21C.

[0084] As shown in FIGS. 2 and 22, in the playing unit 2 at a position thereof near the disc insertion slot 3, a slide 65 is mounted for movement in transversal directions. The slide 65 has a rack 66 provided at the top surface, and is always pulled by a spring 67 toward a rightward direction. A double insertion prohibit member 68 is mounted through a shaft 69 between the slide 65 and the disc insertion slot 3. The member 68 had a gear portion 70 in mesh with the rack 66.

[0085] The double insertion prohibit member 68 is normally at a position spaced apart from the passage 9 of the disc D. When the slide 65 is moved to the right, the member 68 is caused to rock by substantially 90 degrees to an upright state at a front position of the passage 9 of the disc D, as shown in FIG. 23, and thus prohibits insertion of the disc D from the disc insertion slot 3. As shown in FIG. 2, the stopper 57 and the slide 65 are coupled to each other via an intermediate member 71. The intermediate member 71 is capable of rocking horizontally about a shaft 72, and has an end portion having an elongate hole 73, in which the engagement pin 60 of the stopper 57 is received, and has the other end rockably coupled to the slide 65. The engagement pin 60 is held at the right end of the elongate slot 73 by the elastic force of the spring 67.

[0086] In the disc player having the construction as described above, the disc D is transferred as follows.

[0087] Before the disc insertion, the push member 40 is holding the push-back member 12 at the position as shown in FIG. 8, with its first and second disc receiving portions 22aand 22bfound above the turntable 5. In this state, the cam pin 24 of the connecting member 13 is located in the cam groove 23 in the end portion thereof remote form the center of rocking, and is holding the disc push portion 21 of the push-forth member 11 at the left end of the disc insertion slot 3. Also, as shown in FIG. 15A, the first switch 42ais held pushed and “on” by the pressure receiving portion 29 of the push-back member 12, and the second switch 42bis found in the first angular hole 36aof the rotation member 17 and “off”. Furthermore, the one-direction motor 19 is held stationary.

[0088] In this state, the edge of disc D inserted from the disc insertion slot 3 passes by the disc pushing portion 21 of the push-forth member 11 and, as shown in FIG. 7, comes to intervene between the elastic retainers 44 and the inclined surface portions 9a.

[0089] As shown in FIG. 2, after the edge tip of the disc D has been brought into contact with the first disc receiving portion 22aof the push-back member 12, the disc D pushes forth the push-back member 12 (toward the rear of the playing unit 2).

[0090] At this time, the push-back member 12 rocks to cause movement of the cam pin 24 of the connecting member 13 along the cam groove 23. The connecting member 13 and the push-forth member 11 thus follow the push-back member 12, and the disc push portion 21 of the push-forth member 11 is brought to be ready for pushing forth the edge of the disc D.

[0091] The rocking of the push-back member 12 eventually also brings the second disc receiving portion 22bof the push-back member 12 into contact with the edge of the disc D. Eventually, however, as shown in FIG. 11, the first disc receiving portion 22ais separated from the edge of the disc D, and the disc D consequently pushes the sole second disc receiving portion 22b.

[0092] As shown in FIG. 15C, when the push-back member 12 has rocked to the position shown in FIG. 11 and the contact portion 28 enters the orbit of rocking of the push portion 37, the first switch 42ais released from the pressure receiving portion 29 and turned off, whereupon the one-direction motor 19 (at position a in FIG. 24) is started.

[0093] The rotation member 17 receives the torque from the motor 19 thus started, and is rotated in the clockwise direction, thus pushing the contact portion 28 with the push portion 37 and causing counterclockwise rocking of the push-back member 12. The connecting member 13 and the push-forth member 11 follow the push-back member 12, and rock in the counterclockwise direction. The disc push portion 21 of the push-forth member 11 thus quickly pushes forth the disc D.

[0094] At this time, the connecting member 13 and the push-forth member 11 are held to be integral with each other merely elastically by the spring 14. Thus, the elastic force of the spring 14 neither affects the engagement relation between the cam groove 23 and the cam pin 24 nor constitutes any load on the one-direction motor 19. The push-back member 12, the connecting member 13 and the push-forth member 11 are thus smoothly moved.

[0095] Sometimes, the user may intend in fluster to pull out the disc D which is being brought forth by the driving force of the motor 19. In such a case, it is undesired if the disc can not be pulled out due to surpassing mechanical force or if the internal mechanism is damaged due to excessively strong pulling force.

[0096] In the disc player as described above, the push-forth member 11 and the connecting member 13 are held integrally by the spring 14. Thus, when the user intends to pull out the disc D being brought forth toward the playing portion P by the diving force of the motor 19, the push-forth member 11 is pushed by the edge of the disc D and, as shown in FIG. 25, rocks away from the connecting member 13 while elongating the spring 14. The disc D thus can be pulled out safely without possibility of damaging the internal mechanism.

[0097] Besides, since the stopper 57 prohibits the descent of the clamper 6 until the disc D has been set in the play position, it is not possible the clamper which may otherwise be lowered makes it difficult to take out the disc D being inserted.

[0098] Right after the start of the one-direction motor 14, the second switch 42bis detached from the first angular hole 36a, and is pushed and turned on by the bottom surface of the rotation member 17. At this time, the one-direction motor 19 continues its rotation. (at position b in FIG. 24) In the meantime, the push pin 40bof the push member 40 is shifted from the first pressure receiving surface 29bof the pressure receiving portion 29 to the second pressure receiving surface 29cthereof, and applies counterclockwise torque to the push-back member 12.

[0099] When the disc D comes to a position to be concentric with the turntable 5, as shown in FIG. 12, the push portion 37 of the rotation member 17 is separated from the contact portion 28 of the push-back member 12, and the first arcuate surface 38 is in turn brought into contact with the contact surface 28. At this time, the push-back member 12 suspends its rocking for a while. Also, the push pin 40bof the push member 40 is on the shoulder 29dof the pressure receiving member 13, and provides no torque to the push-back member 12. Furthermore, the cam pin 24 of the connecting member 13 is at a position in the cam groove 23 of the push-back member 12 near the end closer to the center of rocking.

[0100] When the disc D comes to a position to be capable of being held on the turntable 5, the edge of the disc D pushes the disc receiving portion 59 of the stopper 7. As a result, the preventing portion 62 of the stopper 57 departs from its position below the engagement portion 64, and this position is in turn assumed by the sliding contact portion 63. As shown in FIG. 26, the edge of the disc D is consequently held at three points by the disc push portion 21 of the push member 11, the second disc receiving portion 22bof the push-back member 12 and the disc receiving portion 59 of the stopper 57.

[0101] While the first arcuate surface 38 is in contact with the contact portion 38, the push-back member 12 is suspending its rocking. During this time, the rotation member 17 is still continually rotated. The cam contact portion of the clamper supporting member 4 is thus eventually brought into contact with the clamper control cam 34 of the rotation member 17. As a result, the clamper supporting member 4 is caused to rock down to lower the clamper 6. The clamper 6 thus comes to hold the disc D on the turntable 5 with its flange portion 54. During the downward rocking of the damper supporting member 4, as shown in FIG. 21C, the engagement portion 64 slides on the sliding contact portion 63, thus causing movement of the stopper 57 to the retreated position to be out of contact with the edge of the disc D.

[0102] With further rotation of the one-direction motor 19, the contact point of the contact portion 28 is eventually shifted from the first arcuate portion 38 to the second arcuate portion 39. As a result, the push-back member 12 is caused to slightly rock again in the counterclockwise direction.

[0103] As shown in FIG. 13, the counterclockwise rocking of the push-back member 12 causes the cam pin 24 of the connecting member 13 to be moved to the separating portion of the cam groove 23, causing slight clockwise rocking of the push-forth member 11. As shown in FIG. 27, the disc push portion 21 of the push-forth member 11 and the disc receiving portion 22bof the push-back member 12, following the disc receiving portion 59 of the stopper 57, are separated from the edge of the disc D. While the cam pin 24 is moved along the cam groove 23, the elastic force of the spring 14 neither affects the engagement relation between the cam pin 24 and the cam groove 23 nor constitutes any load on the one-direction motor 19.

[0104] At the time of separation of the disc receiving portion 59 from the edge of the disc D with the downward rocking of the clamper supporting member 4, the stopper 59 is caused to rock, thus causing the engagement pin 60 to move along the elongate hole 73 in the intermediate member 71 and eventually come to push the other end of the elongate hole 73. As a result, the intermediate member 71 is caused to rock in the clockwise direction, thus causing rightward movement of the slide 65 against the force of the spring 67. As shown in FIG. 23, the double insertion prohibit member 68 is thus brought to its upright position.

[0105] When the second angular hole 36bof the rotation member 17 comes to the position of the second switch 42b, the second switch 42bis released from the rotation member 17 and turned off, thus stopping the one-direction motor 19 (at position c in FIG. 24).

[0106] Then, the motor 7 of the playing portion P is started to cause rotation of the turntable 5, the clamper 6 and the disc D in unison with one another, while the pick-up 8 is also operated. Data recorded in the disc D is thus played back.

[0107] There may occur a circumstance when the user intends by mistake to insert other disc during the above playback operation. In such a case, the other disc being inserted may be brought into contact with and damage the inner disc D under rotation or cause damage to the internal mechanism. In the disc player of the present invention as described herein, the double insertion prohibit member 68 is held upright on the passage 9 of the disc D and prohibits the insertion of other disc during the playback operation. It is thus possible to eliminate the possibility of doubly inserting a disc and causing damage to the disk and the internal mechanism due to otherwise possible double insertion.

[0108] When the operation of unloading the disc D is caused by stopping the playback operation, an ejection switch (not shown) is turned on to start the one-direction motor 19 (at position d in FIG. 24) again.

[0109] The re-start of the one-direction motor 19 causes the clamper control cam 34 to be separated downward from the cam contact portion 49. As a result, the clamper supporting member 4 is caused to rock upward and raise the clamper 6. At this time, the stopper 57 is released from the engagement portion 64 and restored to the initial position by the torsion spring 61, thus bringing its disc receiving portion 59 into contact with the edge of the disc D. Also, the slide 65 is restored by the spring 67, causing rocking of the double insertion prohibit member 68 to a position beneath the passage 9 of the disc D.

[0110] Right after the re-start of the one-direction motor 19, the second switch 42bis detached from the second angular hole 36 of and turned on by the rotation member 17. At this time, the motor 19 (at position e in FIG. 24) is continually rotated. In the meantime, the partial gear 31 of the rotation member 17 is brought into mesh with the idler gear 18. Since the idler gear 18 is normally in mesh with the gear portion 27 of the push-back member 12, the torque of the motor 19 is thus the gear portion 27 of the push-back member 12, thus causing clockwise rocking thereof and bringing the second disc receiving portion 22binto contact with the edge of the disc D. At the same time, the cam pin 24 of the connecting member 13 leaves the separating portion 23aand causes slight counterclockwise rocking of the push-forth member 11, thus also bringing the disc push portion 21 of the push-forth member 11 into contact with the edge of the disc D.

[0111] As the clockwise rocking of the push-forth member 11 proceeds in this state, as shown in FIG. 28, the disc D is pushed back from the playing portion P toward the disc insertion slot 3 by the second disc receiving portion 22band subsequently by the first disc receiving portion 22areplacing the second one. In this operation, the disc is transferred relatively slowly compared to the speed in the disc loading operation although the rotation speed of the motor 19 is constant. This is so because in the disc unloading operation the disc is transferred via the train of the partial gear 31, the idler gear 18 and the gear portion 27 meshed with one another, while in the disc loading operation it is transferred with the contact portion 28 of the push-back member 12 pushed by the push portion 37 of the rotation member 17.

[0112] When the pressure receiving portion 29 of the push-back member 12 comes to the position above the first switch 42aagain, the switch 42ais turned on (at position f in FIG. 24).

[0113] When the disc D has been pushed back by the first disc receiving portion 22aof the push-back member 12 up to a position with its center hole fully exposed on the outside of the disc insertion slot 3, the cam pin 24 of the connecting member 13 is caused to move along the cam groove 23 from a position thereof close to the rocking center to a position near the end remote from the rocking center. As a result, the disc push portion 21 of the push-forth member 11 is restored to a position in the neighborhood of the left end of the disc insertion slot 3.

[0114] Also, the first angular hole 36aof the rotation member 12acomes again to be above and turns on the second switch 42b, thus stopping the one-direction motor 19 (at position g in FIG. 24).

[0115] The edge of the disc D is pushed back by the push-back member 12 while being elastically held between the elastic retainers 44 and the inclined surface portions 9a, so that it does not get out or down from the disc player although it is brought to a position that more than one half of it projects from the disc player to the outside. The disc D at this position can be readily taken out by inserting fingers into its center hole.

[0116] As has been described in the foregoing, with the recording medium transfer apparatus according to the invention, when rocking the transfer means 10 in one direction with the driving, by the motor 19, of the rotation member 17 having the partial gear 31 and the push member 35 for rocking in one direction, the rotation of the rotation member 17 is transmitted directly by the push member 35 to the transfer means 10. When rocking the transfer means in the other direction, the partial gear 31 is meshedly coupled via the idler gear 18 to the gear portion 27 of the transfer means 10.

[0117] Thus, although the rotation member 17 is rotated in a fixed direction, the direction of rocking of the transfer means 10 can be changed with the insertion of the idler gear between the rotation member 17 and the transfer means 10. It is thus possible to provide a recording medium transfer apparatus, which permits reciprocal transfer of recording medium with the one-direction motor 19 used as a drive source and without complicating the power transmission line from the motor 19 to the transfer means 10.

[0118] Particularly, with the push member 35 formed such as to have the push portion 37 for pushing the contact portion 28 and the arcuate surfaces 38 and 39 for holding the contact portion 28 at predetermined position after separation of the push portion 37 from the contact portion 28, it is possible, when the invention is applied to, for instance, a disc transfer apparatus for a disc player, to utilize the torque of the rotation member 17 for causing such operation as holding the disc D, having been transferred to the playing portion P, with the transfer means 10 held at a predetermined position. In this way, the motor 19 can serve as a common motor and be operated as a drive source for other separate process caused subsequent to the transfer of recording medium.

[0119] The timings of starting and stopping the one-direction motor may be satisfactorily set as follows.

[0120] The transfer means is pushed and rocked in one direction by an inserted recording medium, causing the motor to be started with the contact portion 28 of the transfer means 190 brought to the orbit of rotation of the rotation member. The motor 19 is stopped after separation of the push member 35 from the contact portion 25. Also, in response to the operation of unloading the recording medium, the motor 19 is started to bring the partial gear 31 into mesh with the idler gear 18, and it is stopped when the rotation member 17 has completed one rotation.