Device for collating sheets of paper

[0002] The invention pertains to a device for collating sheets of paper for subsequent transport together to a collection station, with feeders for separating the sheets of paper. In the general state of the art it is already known how to separate the sheets of paper arriving for collation, in particular in an envelope-stuffing or collating system, for example, by means of a conveyor belt, for transport to a collection station. Further processing, such as envelope stuffing and distribution in a collection bin occurs from this collection station.

[0003] The present invention addresses the problem of improving a collating device to increase the effectiveness and efficiency of the collation operation.

[0004] This problem is solved according to this invention, in that the feeders provided for simultaneous feeding of the sheets of paper are connected to a chute which is located above the collection station. The advantage of this arrangement is that the separated sheets of paper are fed into a chute which is free of transport restrictions of any kind. Therefore, mechanical transport features are not needed, so that the expense for the manufacture of such equipment will be reduced significantly.

[0005] The separated sheets of paper fed into the chute float downwardly on a cushion of air and thus an orderly collating of the sheets of paper is possible in an exceptionally simple and effective manner. The cross section of the chute in this case should preferably be dimensioned so that the side walls forming the shaft have a spacing which is only slightly larger than the length of the appropriate side of the sheet of paper. In this regard, it should be mentioned that the paper for collation need not be individual sheets of paper, of course. Rather, already folded or otherwise joined paper may be used. The term paper as used within the framework of this disclosure is not restricted exclusively to the material “paper.” Rather, this term is intended also to include sheet-like, also folded or otherwise joined, sheets or leaves of any particular material, such as plastic.

[0006] The feeding of the sheets of paper takes place preferably simultaneously, so that due to the presence of the chute, a uniform sinking of the separated sheets of paper is possible.

[0007] In a further refinement of the invention, the chute can have a rectangular shape, whereby the feeders are located on at least on one side of the chute. Alternatively, it is possible to place the feeders at opposite sides of the chute and with a height offset. For a smooth output of the sheets of paper, the feeders can be positioned at an angle to a vertical axis of the chute, whereby it is expedient for the angle of incline of the feeders to be in a range of 60° to 80°, with respect to the vertical axis.

[0008] According to another feature of the invention, the feeders on the front side leading to the chute are each equipped with a retention device and with separating rollers. In order to be able to transport relatively soft sheets of paper, in a further refinement of the invention, an additional stabilizing roller can be provided in the feeder which gives the sheets of paper a slight V-shape. This will stabilize the sheets of paper and improve the aerodynamics of the sheets of paper moving in the chute.

[0009] Openings for the escape of air can be provided, preferably in the base of the chute, so that the air located underneath the sheets of paper floating downward can escape below and the sinking movement of the sheets of paper will not be disrupted by eddy currents or streams. Thus a clean collating or placement will be assured.

[0010] In a preferred embodiment of the invention, at least one, and preferably two, of the side walls forming the chute are designed so that the distance between the mutually opposite side walls can be adjusted. In this regard, the given side walls are designed so that they are displaceable. Preset positions corresponding to fixed standard sizes of sheets of paper can be defined by lock-in positions. The given side walls can be locked into these lock-in positions, but it should also be possible to lock the walls in any particular intermediate position. Thus, sheets of paper of different size can be optimally collated. By setting of the distance(s) of the side walls, that is, defining the cross section of the chute, the air cushion forming beneath the sheets of paper, and thus the rate of sinking and the sinking behavior of the sheets of paper, can be affected and adjusted in an optimum manner.

[0011] The adjusting of the position of the side walls can take place, of course, through the use of a suitable adjusting drive.

[0012] The invention will be explained in greater detail below based on the embodiments presented in the drawing.

[0013] These and other objects, advantages, and features of the invention will be apparent from the following description of the preferred embodiments, considered along with the accompanying drawings.

[0014] FIG. 1 is a schematic side view of the device embodying the principles of the invention for collating sheets of paper.

[0015] FIG. 2 is front view of the feeding device with stabilizing rollers.

[0016] FIG. 1 presents a device 1 for collating of sheets of paper 10. The device 1 is combined with an additional device for the feeding of envelopes 11 and a collection station 20, so that the device presented in FIG. 1 pertains to an envelope-stuffing machine.

[0017] The device 1 features a chute 3, which has preferably a rectangular shape, whereby at the base of the chute, the sheets of paper 10 are collated into a stack of paper 22. At the bottom there are preferably features which ensure a neat forming of the stack, for example, in the form of guide walls 13. Furthermore, although not shown in the figures, features can be provided for keeping the stack of paper 22 until it is fully formed and for release of the finished stack of paper 22 for subsequent processing.

[0018] One or more of the side walls, side walls 16 and 16′, for example, forming the chute can be of adjustable design with regard to their position or spacing. Thus it is possible to adapt the spacing of the side walls to the particular edge lengths of the sheets of paper being collated. As an adjustment, the side walls can be moved along one or more rails 17. The rails and the side walls moving thereon can define lock-in positions which correspond to the standard sizes of the sheets of paper to be collated. Of course, an adjustment drive 18 can also be provided for automatic adjustment of the side walls. Thus the adjustment of the spacing of the side walls can be performed, for example, by merely pressing a button on an appropriate operator console.

[0019] By adjustment of the cross section of the chute 3, the sinking behavior of the sheets of paper being collated, in particular the rate of sinking, can be adjusted in an optimum manner. Thus an optimum collating result will be assured, namely, of the formation of a neat and orderly stack of paper 22 at the bottom of the chute 3.

[0020] In the embodiment presented in FIG. 1, the feeders 2 and 2′ are used for separating the sheets of paper 10 and these feeders are located at opposite sides 5 and 6 of the chute 3. In the present case, on each of the sides 5 and 6 there are two feeders 2 and 2′, which are offset in height with respect to each other, that is, by an amount V between the feeder 2 on side 6 and the feeder 2′ on side 5, for instance.

[0021] These feeders 2 and 2′ are inclined with a vertical axis A—A of the chute 3, wherein the angle of inclination α of the feeders 2, 2′ is about 60° to 80° with respect to vertical axis A—A.

[0022] From FIG. 1 it is evident that the feeders 2, 2′ are each provided with a retainer 14 and with separating rollers 8 on the front side leading to the chute 3.

[0023] Starting materials, that is, sheets of paper 10, which are present on the particular feeders 2, 2′, are usually already prefolded, whereby these sheets of paper 10 have a high inherent stability due to the folding.

[0024] The sheets of paper 10′ singled out by the feeders 2, 2′ drop into the chute 3 which is free of any kind of transport restrictions. As is evident in the representation according to FIG. 1, there are four separated sheets of paper 10′ in the chute that are fed in simultaneously via the two pairs of height-offset feeders 2 and 2′.

[0025] Due to this configuration of the shaft, a uniform and simultaneous sinking of the individual sheets of paper 10′ is possible, and the sheets collect at the bottom of the chute 3 to form the stack of paper 22.

[0026] Each stack of paper 22 may then be pushed in a known (and not illustrated) manner into an envelope 11 supplied from the underside of the device 1. Thereafter, the envelopes may be closed and sent to the collection station 20. In order also to be able to transport and collate even relatively soft sheets of paper, according to FIG. 2 it is possible to install an additional stabilizing roller 15 in the particular feeders 2 and 2′. Due to this stabilizing roller 15, a slight V-shape is imparted to the given sheets of papers 10′, so that a stabilization of the paper will result. Thus the aerodynamics of the paper 10′ moving downwardly in the chute 3 are improved. The attachment of the feeders can occur both on the right and left side of the chute 3, or on both sides. Thus an increase in the system capacities is obtained for the individual feeders. In addition, the sheets of paper 10′ supplied to the chute 3 are stabilized by the simultaneous and uniform sinking onto the stack 22. The device 1 according to this invention for collating sheets of paper makes it possible to increase the efficiency of the overall device in a simple manner.

[0027] The above-described preferred embodiments are intended to illustrate the principles of the invention, but not to limit the scope of the invention. Various other embodiments and modifications to these preferred embodiments may be made by those skilled in the art without departing from the scope of the following claims.