Apparatus for Changing Intervals at Which Selected Wires Are Arranged in a Lateral Arrangement of Wires

The present invention relates generally to an apparatus for changing intervals, or spacing, at which selected wires are arranged in a lateral arrangement of wires, which apparatus is used in crimping or otherwise fixing male or female connector elements to wire ends arranged at selected intervals.

As is well known, male or female connector elements are automatically crimped or otherwise fixed to the ends of a plurality of wires in the production of wire harnesses. Often, it is necessary to rearrange a lateral arrangement, i.e., the position, of wires so as to be at same intervals in which the male or female connector elements are arranged at the crimping stage. One conventional wire-rearranging apparatus uses a wire-passing stand having a plurality of slots arranged laterally at given intervals. Another conventional wire-rearranging apparatus uses a comb-like plate having a plurality of slots laterally arranged at given intervals in which the slots are arranged at fixed intervals. Such conventional wire-rearranging apparatuses are disclosed for instance, in Japanese Utility Model Application Public Disclosure No. 2-44243 and Patent Application Public disclosure No. 1-307185.

The arrangement of slots at fixed intervals in the comb-like plate permits a lateral wire arrangement or position to be rearranged so as to be at the same regular intervals as the slots of the comb-like plate or in the same pattern as the slots of the comb-like plate are arranged. Therefore, it is necessary to have a large supply of different comb-like plates having slots at different intervals or in different interval patterns so as to meet a variety of demands for changing wire intervals. The preparing of numerous different comb-like plates to meet occasional demands requires laborious and time-consuming work using extra jigs and tools. Accordingly, the work efficiency will be lowered.

One object of the present invention is to provide an apparatus for changing intervals or positions at which selected wires are arranged in a lateral arrangement of wires, which apparatus is capable of meeting all demands for changing wire intervals or wire-interval patterns quickly.

To attain this object, an apparatus for changing intervals at which selected wires are arranged in a lateral arrangement of wires is improved according to the present invention in that: a lateral arrangement of linear wire carriers, such as hollow pipes each allotted to each of the wires of the lateral wire arrangement; means for applying opposing forces to the linear pipes to cause the linear pipes to get close to each other; and a wire-interval changing blade assembly comprising a plurality of blades between selected adjacent linear pipes against the opposing forces applied to the linear pipes, thereby causing their forward ends to separate from each other while allowing their backward ends to remain close to each other, thus diverging forward as a whole.

With this arrangement, blades in the wire-interval changing blade assembly are selected according to a desired interval or interval pattern to allow the blades to intervene between selected adjacent linear pipes against the opposing forces applied to the linear pipes, thereby causing their forward ends to separate from each other while allowing their backward ends to remain close to each other, thus diverging forward to form a desired interval pattern. Then, wires are passed through the rearranged pipes, and the forward ends of the wires appearing from the forward ends of the pipes arranged in the same pattern as the male or female connector elements arranged in the crimping or otherwise connecting stage. When the wire-interval pattern is desired to be changed, the blades are reselected in the wire-interval changing blade assembly to intervene between selected adjacent linear pipes according to the new wire-interval pattern.

The means for applying the opposing forces to the pipes may be springs.

Each blade of the wire-interval changing blade assembly may have a tapered top, and may be equipped with a pneumatic cylinder for raising and descending the blade. Each blade may be detachably fixed to a transverse plate at a selected level. This plate may have a single pneumatic cylinder for raising and descending all the blades with respect to the lateral arrangement of linear pipes.

Each blade may be a cam detachably fixed to a shaft at a selected axial position. The cam may have rising and descending sections along its circumference, and the shaft is adapted to be rotated by an associated motor.

Other objects and advantages of the present invention may be understood from the following description of some preferred embodiments of the present invention, which are shown in accompanying drawings:

FIG. 1 is a plan view of a wire rearranging apparatus according to a first embodiment of the present invention;

FIG. 2 is an elevational view of the wire rearranging apparatus of FIG. 1 taken along lines 2--2 thereof;

FIG. 3 is a sectional view of the wire rearranging apparatus of FIG. 2 taken along lines 3--3 thereof with a portion of the wires removed;

FIG. 4 is a sectional view of the wire rearranging apparatus of FIG. 3 taken along lines 4--4 thereof;

FIG. 5 is an elevational view of the wire rearranging apparatus of FIG. 2, taken from the rear of the apparatus;

FIG. 6 is a sectional view of the wire rearranging apparatus of FIG. 2 taken along line 6--6 thereof;

FIG. 7 is an elevational view of the wire rearranging apparatus of FIG. 2, taken from the front of the apparatus;

FIG. 8 is an enlarged view of a comb plate used in the wire rearranging apparatus;

FIG. 9 is a sectional view of the wire rearranging apparatus of FIG. 2 taken along line 9--9 thereof;

FIG. 10 is a diagrammatic view illustrating the relative positions of the linear pipes, the wires and the slots of the comb plate of the wire rearranging apparatus;

FIG. 11 is a plan view of the wire rearranging apparatus of FIG. 2, illustrating how the linear pipes are arranged in parallel at the outset;

FIG. 12 is a sectional view of the wire rearranging apparatus of FIG. 11 taken along line 12--12 thereof;

FIG. 13 is a plan view of the wire rearranging apparatus of FIG. 11 illustrating how the linear pipes are separated into two groups by a selected blade to provide a divergent form, and that all wires are corrected in position by an associated pitch correction means;

FIG. 14 is a sectional view of the wire rearranging apparatus of FIG. 13 taken along line 14--14 thereof;

FIG. 15 is a plan view similar to FIG. 13, but showing that all wires are not corrected in position;

FIG. 16 is a plan view of the wire rearranging apparatus, showing partly in section, that the linear pipes are separated into three groups by one selected blade and two selected adjacent blades to provide a divergent form, and that all wires are corrected in position by an associated pitch correction means;

FIG. 17 is a sectional view of the wire rearranging apparatus of FIG. 16 taken along line 17--17 thereof;

FIG. 18 is a plan view similar to FIG. 16, but showing that all wires are not corrected in position;

FIG. 19 is a plan view of a second embodiment of a wire rearranging apparatus according to the present invention, illustrating how the wires are inserted in the pipes arranged close in parallel;

FIG. 20 is a sectional view of the wire rearranging apparatus of FIG. 19 taken along line 20--20 thereof;

FIG. 21 is a plan view illustrating the linear pipes separated into two groups by a selected blade to define a divergent form, and that all wires are not corrected in position by an associated pitch correction means;

FIG. 22 is a sectional view of the wire rearranging apparatus of FIG. 21 taken along line 22--22 thereof;

FIG. 23 is a plan view of the wire rearranging apparatus, showing that the linear pipes are separated into four groups by three selected blades to provide a divergent form, and that all wires are not corrected in position by an associated pitch correction means;

FIG. 24 is a sectional view of the wire rearranging apparatus of FIG. 23 taken along line 24--24 thereof;

FIG. 25 is a perspective, exploded view of a wire-interval changing blade assembly used in the wire rearranging apparatus of FIG. 26;

FIG. 26 is a plan view of a third embodiment of a wire rearranging apparatus according to the present invention, illustrating the wires inserted in the pipes parallel;

FIG. 27 is a sectional view of the wire rearranging apparatus of FIG. 26 taken along line 27--27 thereof;

FIG. 28 is a plan view of a wire rearranging apparatus illustrating how the linear pipes are separated by a selected cam blade into two groups, thus defining a divergent form, and that all wires are not corrected in position by an associated wire-pitch correction means;

FIG. 29 is a sectional view of the wire rearranging apparatus of FIG. 28 taken along line 29--29 thereof;

FIG. 30 is a plan view of the wire rearranging apparatus, illustrating the linear pipes separated by three selected cam blades into four groups, and that all wires are not corrected in position;

FIG. 31 is a sectional view of the wire rearranging apparatus of FIG. 30 taken along line 31--31 thereof;

FIG. 32 is a sectional view of a wire rearranging apparatus according to a fourth embodiment of the present invention;

FIG. 33 is a sectional view, partly broken, of the wire rearranging apparatus of FIG. 32 taken along line 33--33 thereof; and

FIG. 34 is a perspective view of a cylindrical displacement member used in the wire rearranging apparatus of FIG. 32.

Referring now to FIGS. 1 to 18, a first embodiment of a wire rearranging apparatus constructed in accordance with the principles of the present invention is generally described at 100. As seen from FIGS. 1 to 10, the apparatus 100 includes a base plate 1 with forward and rearward walls 2 and 3 rising from its forward and rearward ends. In operation, wires are fed from the rearward wall 3 to the forward wall 2. A plurality of wire-receiving carriers, illustrated as elongated pipes 4a-j, are arranged in parallel, extending from the forward to rearward end walls 2, 3 in perpendicular relation to these opposite end walls 2 and 3. These pipes 4a-j are pushed into contact with each other by opposing springs 12a and 12b, which are fixed to spring mounts 13a and 13b which are disposed at the centers of the opposite longitudinal sides of the base plate 1.

As for the manner in which the parallel pipes 4a-j are supported by the forward and rearward walls 2, 3, it can be seen from FIG. 6, that the rearward wall 3 includes a series of circular recesses 6 to hold the rearward ends 5 of the parallel pipes 4a-j, which circular recesses 6 are so close as to communicate with each other on their adjacent sides, permitting the remaining upper and lower arc sections thereof to grip allotted pipe ends, preventing the pipes from shifting between adjacent recesses. Thus, parallel wire-passages 7 are defined by the circular recesses 6 and the longitudinal hollow spaces of associated pipes 4a-j.

The forward end wall 2 has a lateral slot 9 disposed therein in a direction transverse to the axes of the pipes 4a-j to loosely hold the forward ends 8 of the parallel pipes 4a-j. The forward end wall 2 includes an additional lateral slot 11 in communication with slot 9 to permit wires to pass therethrough after passing through the pipes 4a-j. As seen from FIGS. 1 and 7, extra spaces 10 are provided at the opposite ends of the lateral slot 9. Likewise, extra spaces are provided at the opposite ends of the lateral slot 11. Thus, the forward end 8 of each pipe can move laterally with its rearward end 5 remaining at its fixed center to form a divergent pattern of pipe arrangement. As seen from FIG. 2, the lateral slot 9 has a vertical size somewhat larger than the lateral slot 11, thus forming a step therebetween to thereby to prevent the forward ends of the parallel pipes 4a-j from going beyond the forward end wall 2.

A wire-interval changing blade assembly 14 is provided with the apparatus 100 and is disposed under the pipes 4a-j just behind their forward ends.

As best shown in FIG. 9, the wire-interval changing blade assembly 14 comprises a plurality of displacement members, such as blades 15a-j, preferably equal in number to the number of pipes 4a-j (ten in this particular embodiment 100), and associated pneumatic cylinder 18 and pistons 19 for raising and lowering the blades 15a-j relative to the overlying 4a-j. Each blade has a tapered end 17. The tapered end 17 has a slanted surface 16, which can intervene between adjacent tubes at the pipe boundary lines indicated at 21. All blades 15a-j are arranged so as to put their tapered ends 17 in alignment with the boundary lines 21 defined between adjacent pipes.

In this particular embodiment the pneumatic cylinders 18 are fixed to a base 20 in the vicinity of the forward end wall 2, and all of the blades 15d-j are arranged so as to permit the rising and descending of the blades through a lateral slot 22 formed in the overlying base 1, thereby intervening between and withdrawing from the pipes 4a-j.

A wire-interval correction unit 23 may be disposed ahead of the forward end wall 2 and includes a comb plate 24, a pneumatic cylinder 27 and an associated piston 28 for raising and lowering the comb plate 24. The comb plate 24 has a plurality of slots 25a-n arranged at regular intervals for accepting wires appearing from the forward ends of the pipes 4a-j. The comb plate 24 is placed in the vicinity of the forward end wall 2. As best seen from FIG. 10, the comb plate 24 has chamfered tooth projections which define divergent spaces between adjacent tooth projections.

FIG. 10 illustrates how the interval, or pitch P, between adjacent wires 29a-j, the outer diameter W of the pipes 4a-j, the width H of the blades 15a-j and the pitch R between adjacent slots 25a-n are related. In operation, the wires 29a-j are inserted in the pipes 4a-j with their longitudinal axes exactly aligned with each other, and all pipes 4a-j are maintained in a parallel arrangement with each other by the springs 12a, 12b so that the interval, or pitch P, between adjacent wires 29a-j is equal to the outer diameter W of the pipe 4a-j.

Even if wires are somewhat offset from their common longitudinal axes, the interval, or pitch, P between adjacent wires is substantially equal to the outer diameter W of the pipe because the offset is negligible as compared with the wire-interval P or pipe diameter W.

The width H of each blade 15a-j, the slot pitch R of the comb-like plate 24, the wire interval P and the outer diameter W of each pipe 4a-d are preferably equal to each other, and the width of each slot 25a-n is adequate to allow the wire to fit therein.

Referring to FIGS. 11 to 18, the operation of the wire-interval changing apparatus according to the first embodiment shall now be described. A plurality of wires 29a-j are arranged at regular intervals P, and the wires 29a-j are fed into the wire-interval changing apparatus 100. In instances where the wire-interval changing apparatus is used in combination with an apparatus for crimping and fixing male or female connector pieces to wire, the wires to be fed into the wire-interval changing apparatus are cut to a predetermined length before feeding into the wire-interval changing apparatus.

Prior to the feeding of wires into the wire-interval changing apparatus, the intervals at which selected pipes containing at least two wires are changed. A description is now given as to how the arrangement pattern of FIGS. 11 and 12 is changed to the arrangement pattern of FIGS. 13, 14 and 15. Specifically, the interval between the wires 29e and 29f is changed while the other wires remain at same intervals P. Accordingly, the interval between the pipes 4e and 4f in which the wires 29e and 29f are to be inserted is changed as follows. The blade 15f is raised by the pneumatic cylinder 18 until its tapered end has intervened between the pipes 4e and 4f, thereby permitting the slanted surface of the tapered end to push the pipes 4f, 4g, 4h, 4i and 4j toward the spring 12b while the spring 12b is yieldingly compressed, as seen in FIG. 15. The pipes 4a-4e remain stationary because the straight side of the tapered end of the blade 15f slides on the pipe 4e, causing no pushing, or shifting, force on the pipe 4e, whereas the slanted surface of the blade 15f causes a pushing force on the pipe 4f like a wedge. Thus the forward ends of pipes 4f-j are shifted as a whole in the lateral slot 9 of the forward end wall 2 while the rearward ends of pipes 4f-j remain stationary in the rearward end wall 3, thus forming a divergent pattern of pipe arrangement. The wires 29a-j are subsequently inserted in the pipes 4a-j. Specifically, the wires 29a-e are inserted in the pipes 4a-e, which extend perpendicular to the rearward and forward end walls 3 and 2, and the wires 29f-j are inserted in the pipes 4f-j, which are shifted away from the wires 29a-j. Thus, the wires 29a-29j when exiting from the pipes 4a-4j are changed partly in their interval, and particularly, the wires 29e and 29f are arranged at intervals which are different from those of the other wires.

The blade width H is equal to the wire interval or pitch P, and therefore the pipes 4e and 4f are separated by a two-pitch distance, and accordingly, the wires 29e and 29f are separated by a two-pitch distance. The pipe 4f is inclined, and therefore the distance between the pipes 4e and 4f and hence between the wires 29e and 29f is not exactly equal to two pitches, but almost equal to two pitches. All wires 29a-j appear above the wire interval correction unit 23, and then the comb plate 24 is raised by the pneumatic cylinder 27 and the piston 28 so that the forward ends of all wires 29a-j are fitted in the slots 25a-n. The forward ends of the wires 29a-e extend straight in alignment with corresponding slots of the comb plate 24. The forward ends of the wires 29f-j, however, extend somewhat slanted, accordingly deviating a little from the exact alignment with corresponding slots 25g-25m of the comb plate 24. The comb plate 24 is positioned close to the forward wall 2, and therefore the chamfered teeth of the comb plate can catch the forward ends of the wires 29f-j, the degree of deviation of which remains small because of a small-distance extension beyond the forward wall 2. Thus, these wires 29f-j are yieldingly bent to fit in corresponding slots 25g-m with the result their interval is changed exactly to a two-pitch distance, as shown in FIG. 13. The deviation of the wire within the pipe from its longitudinal, center axis can be reduced by allowing it to be fitted in the corresponding slot of the comb plate 24.

As may be understood, when the wires exit from the forward ends 8 of the pipes 4a-j, the wire-interval correction unit will put all the wires 29a-j into the exact pattern of wire arrangement as desired.

FIGS. 16, 17 and 18 illustrate how the wires 29a-j are rearranged to form another pattern of wire arrangement, in which the wires 29c and 29d are separated by a two-pitch distance (2P), and the wires 29e and 29f are separated by a three-pitch distance (3P). First, the blades 15c and 15f are raised to intervene between the pipes 4c and 4d and between the pipes 4d and 4f, respectively, thereby pushing a group of pipes 4a-4c toward the spring 12a, and at the same time, another group of pipes 4f-j toward the spring 12b. Thereafter, the blade 15g is raised to intervene between the blade 15f and the pipe 4f, thereby further shifting the group of pipes 4f-j toward the spring 12b, as seen in FIGS. 17 and 18. When the wires 29e and 29f exit from the forward ends 8 of the pipes 4a-j, the wire-interval correction unit puts all wires 29a-j into the exact pattern of wire arrangement, as shown in FIG. 16.

The raising-and-lowering of selected blades may be controlled according to a computer program, which is prepared to cause selected pipes to be separated from each other thereby to form a plurality of wire arrangement patterns one after another as desired. Thus, automatic wire-rearrangement can be effected without changing the blade assembly.

Referring now to FIGS. 19 to 24, a second embodiment of a wire-interval changing apparatus 200 according to the present invention is illustrated as using a single pneumatic cylinder 18 in place of a plurality of pneumatic cylinders in the first embodiment 100. As seen from FIGS. 20, 22 and 24, the pneumatic cylinder 18 has an associated piston 19 and a cross plate 30, which has a plurality of holes 32 laterally arranged at regular intervals. Each blade has two holes 31 for adjusting its level with respect to the cross plate 30. As shown in these drawings, the blades 15c, 15f and 15h are fixed to the cross plate 30 by inserting bolts 33 in the selected holes 32 of the blades 15c, 15f and 15h and in selected holes 13 of the cross plate 30, and by fastening these blades and the cross plate 30 with the bolts and nuts 33.

In this particular embodiment, center blade 15f is fixed to the cross plate 30 by using the lower hole 32 whereas the right and left blades 15c and 15h are fixed to the cross plate 30 by using the upper holes 32. When the piston 19 is raised by the pneumatic cylinder 18 to raise the cross plate 30, the blade 15f intervenes between the pipes 4e and 4f (FIG. 22), and thereafter the blades 15c and 15h intervene between the pipes 4c and 4d and between the pipes 4f and 4g, respectively (FIG. 24). Thus, the wire-arrangement is changed from FIGS. 19 and 20 to FIGS. 21 and 22 (the pipes 4e and 4f being separated to separate the wires 29e and 29f by a two-pitch distance), and then to FIGS. 23 and 24 (the pipes 4e and 4f, 4c and 4d, and 4g and 4f being separated to separate the wires 29e and 29f, 29c and 29d, and 29g and 29f by a two-pitch distance).

More specifically, as seen from FIGS. 21 and 22, the piston 19 is raised by the pneumatic cylinder 18 so that a group of pipes 4a-e are shifted toward the spring 12a and so that another group of pipes 4f-j are shifted toward the spring 12b. The piston 19 is further raised to cause the blades 15c and 15h intervene between the pipes 4c and 4d and between the pipes 4f and 4g (FIG. 24) until the forward ends of the wires 29c and 29d, and 29f and 29g are separated by a two-pitch distance, respectively. The wire intervals are finally corrected by the comb plate 24 of the wire-interval correction unit 23.

Referring to FIGS. 25 to 29, a third embodiment of a wire-interval changing apparatus 300 is illustrated as using a cam blade assembly 14 for changing the wire intervals.

The cam blade assembly 14 comprises a splined shaft 34, cam-shaped blades 35c, 35f and 35h and adjusting rings 36. The splined shaft 34 is supported at one end by a bearing 40, and is connected at the other end to the shaft of a control means, such as a stepping motor 39. If occasions demand, the stepping motor 39 may be connected to the cam blade assembly 14 via a reduction gearing unit. The cam-shaped blades 35c, 35f and 35h are adjusted in position along the splined shaft 34 by intervening rings 36 in order to select and raise tubes according to a desired pattern of wire arrangement. In this particular embodiment, a splined shaft 34 is used to permit the cam-shaped blades 35c, 35f and 35h to be detachably fixed to the shaft, but any conventional means may be used to permit the detachable fixing of cam-shaped blades to the shaft.

Each ring 36 has a width equal to the outer diameter of the associated pipe. Referring to FIG. 27, the cam-shaped blades 35, 35f and 35h are arranged on the splined shaft 34 with two rings 36 intervening between the cam-shaped blades 35c and 35f, and with one ring 36 intervening between the cam-shaped blades 35f and 35h, thus putting the cam-shaped blades 35c, 35f and 35h in alignment with the tubes 4c, 4f and 4h respectively. All of the cam-shaped blades 35c, 35f and 35h preferably have the same shape, that is, with similar rising-and descending-sections 37 and 38. In the Figures, particularly in FIGS. 27 & 29, the boundary between the rising- and descending-sections 37 and 38 is indicated by inclined line 41. The cam-shaped blades 35c and 35h are fixed to the splined shaft 34 with their rising sections 37 at same angular positions, and the cam-shaped blade 35f is fixed to the splined shaft 34 with its rising section 37 at a different angular position.

As seen from FIGS. 26 and 27, no cam-shaped blades intervene between the overlying pipes, but the rising-section of the cam-shaped blade 35f is about to intervene between the pipes 4e and 4f, and the splined shaft 34 is rotated to cause the rising-section of the cam-shaped blade 35f to intervene between the pipes 4e and 4f, pushing the pipes 4f-j toward the spring 12b as the right-to-left downwardly inclined wall 41 of the rising-section 37 of the cam-shaped blade 35h (FIG. 31) functions like wedge against the pipe 4g to push the pipes 4g-j away from the pipe 4f. Thus, the forward end of the pipe 4c is put away from the forward end of the pipe 4d by a distance equal to the width of the cam-shaped blade 35c, and the forward end of the pipe 4g is put away from the forward end of the pipe 4f by the distance equal to the width of the cam-shaped blade 35h.

If the wires 29a-j are fed into the wire-interval changer whose pipes 4a-j are arranged as shown in FIG. 28, the wires 29a-j are separated into two groups (one group including the wires 29a-e, the other group including the wires 29f-j) with the wires 29e and 29f separated by a two-pitch distance away from each other. If the wires 29a-j are fed into the wire-interval changer whose pipes 4a-j are arranged as shown in FIG. 30, the wires 29a-j are separated into four groups (the first group including the wires 29a-c; the second group including the wires 29d-e; the third group including the wire 29f; and, the fourth group including the wires 29g-j) with the wires 29c and 29d; 29e and 29f; and 29f and 29g being separated by a two-pitch distance. All wire intervals can be corrected with the aid of the comb plate 24 of the wire-interval correction unit 23.

Referring to FIGS. 32 to 34, a fourth embodiment of a wire-interval changing apparatus according to the present invention is indicated generally at 400. The wire-interval changing apparatus 400 uses cylindrical blades 15a-i in place of the rectangular-sectioned blades used in the first embodiment 100. As best shown in FIG. 34, each cylindrical blade has a tapered end 17, and its tapered end 17 is aligned with the boundary line 21 of adjacent pipes 4. The chamfer 16 of the tapered end 17 functions like a wedge to separate adjacent pipes a distance equal to the diameter of the blades 15.

The springs 12a, 12b which maintain the pipes close together may be replaced by rubber or pneumatic cylinders. The wires are described as being inserted in the pipes after being rearranged, but the wires may be inserted in the pipes before rearranged.

The blade is described as having a width H equal to the outer diameter W of the pipe. It, however, should be understood that the width of the blade can be determined in consideration of the intervals at which selected wires are arranged, the positions at which such blades are placed between the forward and backward walls of the wire-interval changer, and other factors. In any event, it suffices that selected pipes are caused to diverge from each other with their forward ends separated appropriate distances for permitting the wires to be arranged at desired intervals when they exit from the forward ends of the pipes. In instances where the blades have a square cross-section, such as illustrated in the first embodiment and where the blades are positioned closest to the forward end wall 2 of the wire-interval changing apparatus the blade width is determined to be somewhat smaller than the outer diameter of the pipe for the following reason. One of two selected pipes is somewhat inclined to the intervening blade, and therefore, the two selected adjacent pipes are liable to be separated a distance equal to a diagonal of, rather than the side of the square. In contrast, where the blades are positioned apart from the forward wall of the wire-interval changing apparatus, the blade width is smaller than the outer diameter of the pipe, decreasing inversely with the increase of the distance from the forward wall of the wire-interval changer. If occasions demand, the blade width and/or blade position may be determined so as to permit selected wires to be separated by an integer multiple distance of the initial wire-interval at the outlet of the wire-interval changer.

In case that a wire-interval correction unit 23 having a comb 24 is used in correcting selected wires to exact intervals as requested, it is necessary to determine the blade width and/or position so as to permit selected wires to be deviated within the permissible range of each divergent slot of the comb plate 24, thereby allowing the teeth of the comb plate 24 to catch the deviated wires at the outlet of the wire-interval changing apparatus.

The pneumatic cylinders for driving the blades or the stepping motor 39 for driving the splined shaft 34 having the blades fixed thereto may be controlled according to an appropriate computer program or manually for instance, by selecting switches among a group of switches connecting between associated blade drivers and the power supply and by turning the so selected switches on according to an appropriate schedule.

As may be understood from the above, the wire-interval changer according to the present invention facilitates the quick changing of wire-arrangement patterns.

It will be appreciated that the embodiments of the present invention which have been discussed are merely illustrative of some of the applications of this invention and that numerous modifications may be made by those skilled in the art without departing from the true spirit and scope of this invention.