FR2597795A1 - PICKING HEAD USED FOR FLAT PAPERING OF STACKS OF PAPER BY MEANS OF A U-STAPLE, COMPRISING A SEPARATE STAPLE DEVICE AND A SEPARATE PUSHER - Google Patents

Abstract

A STITCHING HEAD USED FOR THE FLAT BROACHING OF STACKS OF PAPER BY MEANS OF A U-SHAPED STAPLE, AND EQUIPPED WITH A MAGAZINE FOR RECEIVING THE SETS OF STAPLES 1 COMPOSED OF A NUMBER OF STAPLES ARRANGED PARALLELY BETWEEN THEY AND DETACHABLE, FROM A PUSHER WHICH ACTS ON ONE OF THE STAPLES HAVING BEEN DETACHED FROM A SET SO THAT IT PICKS THE PILE OF PAPER TO BROACH, IS CHARACTERIZED AS A SEPARATION DEVICE 20 IS PROVIDED FOR DETACHING A STAPLE FROM SET 1 BY ACTION ON THE INTERNAL FACE OF THE MIDDLE PART 14 OF THE U-STAPLE. ONE SLIDER TARE PER SPRING IS NOT ESSENTIAL AND IT IS POSSIBLE TO RELOAD THE STAPLE MAGAZINE WITHOUT INTERRUPTING BROACHING.

Description

a 2597795 The invention relates to a tapping head used for the

  flat broaching of stacks of paper by means of a U-shaped staple having on one side two sides and, between them, a middle part, and provided with a magazine arranged more or less vertically and intended to receive sets of '' staples composed of a number of staples arranged parallel to each other and detachable, a separation device used to detach a staple from the game by action on its middle part, and a pusher, which acts on one staples having been detached from a set so that it

pricks the stack of broach paper.

  The sets of staples named above consist of staples individually preformed and assembled by gluing. In known broaching devices, these sets of staples are arranged, lengthwise, parallel to the stack of paper to be broached, that is to say generally horizontally, and are stored in a store. The pusher is also used to detach one by one the staples of the game necessary for pinout. To this end, the pusher exerts pressure on the external face of the middle part or back of the U-shaped clip, which has two straight sides and a right middle part which connects them. The sets of staples are pressed, at their end opposite the pusher, by a spring-loaded slide valve and are, at the end of each

  stitching process, staple width advances.

  To reload the staple magazine, it is necessary to pull the slide backwards, or even, on certain models, to extract it from the device, to introduce a new set of staples into the magazine and to replace the slide against the new game. It is therefore impossible to broach continuously with known devices because it is necessary to interrupt the broaching to introduce a refill of staples in the magazine. The slide, which exerts considerable pressure on the rear end of the set of staples, is necessary to prevent the set of staples from getting stuck when the pusher meets the external face of the middle part of the staple to be detached, and this, more particularly when the set of staples only comprises a few staples, which would not allow pinning to be carried out under optimal conditions. Indeed, the clip held by the slide, and which follows that which has just been detached by the pusher, serves, at least during part of the pusher stroke, to guide the clip

detached from the game by the latter.

  Patent US-A 3748717 describes a broaching device without slide, where the separation device also detaches the clip by action on the external face (that is to say the face opposite to the sides) of the middle part of that -this. However, when the set of staples has only a few staples left, it can get stuck, which can

disrupt pinout.

  The present invention aims to create a stitching head of the type described in the first paragraph, which in principle makes it possible to remove the spring-loaded slide, so that it then becomes possible to reload the staple magazine during the pinout, and thus avoid the malfunctions that occur when a set of staples only includes a few staples. The object sought is achieved by the present invention in the sense that the travel of the separation device is such that it

  detaches the clip by action on the internal face of the middle part thereof, and that the pusher constitutes an element separate from the separation device.

  In this device, the free front face of the staple to be detached, that is to say the face which is not in contact with the other staples of the set, rests on a surface. Admittedly, the separation device, which acts between the two sides on the internal face of the middle part of the staple, also generates a torque acting on the staple to be detached, and this, because this staple is glued to the others game staples; but this torque is intended to more firmly press the free ends of the sides of the clip to be detached against the above-mentioned surface of the stitching head, which makes it possible to prevent the clip from becoming stuck. Consequently, considerable pressure must not be exerted on the free end of the set of staples to prevent jamming of the staple to be detached. Therefore, a spring-loaded slide is not necessary, and it is therefore possible to reload the staple magazine during broaching. It is not necessary, after detachment of each staple, to apply significant forces to move the set of staples towards the separation device, this displacement being able to simply result from the action of

  gravity if the magazine and the set of staples are available more or less vertically lengthwise.

  In this device, the stapling of the staple cannot be done in the same direction of movement as the detachment of the staple from the game by the separation device. This is why the separation device cannot, as in the case of known tapping heads, be used as a pusher. The invention however offers many possibilities, such as a pusher, placed in the device, and

  which stitch the detached staples from the set one by one into the stack of paper to be broached.

  An embodiment of the invention consists of a device in which the direction of movement of the separation device forms an angle with the direction of movement of the pusher, a device being provided for tilting

  the clip detached from the set of the value of the angle indicated.

  The angle indicated must be preferably around 90.

  This embodiment makes it possible for example to arrange the magazine more or less vertically in the direction described above, so that the sides of the staples of the game are in

  horizontal position, but the stitching of the clip detached from the game is done vertically.

  It is particularly easy to design a tilting device in which the middle part of the clip

  acts as the pivot axis of the clip. The positioning of the staples by tilting is then particularly easy.

  One embodiment of the invention consists of a separation device having at least one slide, the abutment surface of which comes, at the start of the detachment phase of the staple from the game, into contact with the internal face of the middle part of the staple, the support surface of which supports the free front face of the middle part of the staple still stuck to the game. Thus, the support surface can support the staple already detached from the game, and this, more particularly when the slide moves horizontally, and bring this staple to a place where the pusher can act on it. Previously, the clip must have tilted so that its sides are arranged parallel to the direction of movement of the pusher. As a general rule, the slider must then go back, over a length at least equal to the maximum length of the sides of the staples which can be stitched

  by the device in question, so that the ends of the sides are not supported by the support surface sup25 carrying the free front face of the clips to be detached from the game.

  Even when the device is designed in such a way that the force of gravity can in principle tip the staple detached from the set into its correct position for the pinning of the stack of paper, it may be useful that an embodiment of the invention provides that the stitching head has, for the tilting of the staple, a tilting plunger sliding more or less parallel to the pusher and which, after tilting the staple, serves to guide the staple to be moved by the pusher. The result

  then a very safe operation of the device.

  One embodiment of the invention consists of a provision

  sitive in which the free front face of a staple still glued to the game and placed in a position allowing its detachment from the game, presses on the surface of a magnet. It is thus possible to avoid an untimely change of position of the clip. An embodiment of the invention consists of a device in which is provided a device for driving the slider which separates the latter from the staple before the pusher acts on the staple. This promotes noise-free operation of the device. It is also possible to use the pusher to move the slide away from the clip. Additional notes and benefits of

  the invention, on the one hand, in the following description of a

  exemplary embodiment of the invention, with reference to the drawing which represents the important characteristics of

  the invention, and secondly, in the claims.

  Each remark can be taken individually or associated with others, whatever they may be, to constitute an embodiment of the invention. There is shown in FIG. 1 the principle of detaching a staple from a set of staples according to the invention, in the form of a diagram in section, the different phases of movement of an example of a broaching device, of FIG. 2 in fig. 5 at la.fig. 6 in fig. 7 an enlarged view of the slide compared to FIG. 4,

  a section along line VII-VII of fig. 2.

  Fig. 1 represents a set of staples 1, the axis of which

  tudinal is oriented vertically, and which is placed in a device having for the lower clip 4 a bearing surface on which rests this clip 4 with the front face, opposite to the other clips of the game, of the mé5 diane part, as well as the two sides. A guide surface 6 serves as a support for the external faces of the middle parts of the staples of the set 1 located above the staple 4. The correct position of the set of staples is also ensured by a guide element 8 of section U-shaped, whose two sides 12, 10 contiguous to the sides 10 of the staples of the set 1, extend to the bearing surface 2, and whose part 16, contiguous to the internal face of the middle part 14 (or back) of staples is not at its end directly in contact with the support surface 2, but the space which separates it from the support surface is at a distance slightly greater than the maximum thickness of the staples used . Elements 6 and 8 form a store in which several sets

  staples can be inserted from above.

  By moving to the left between the sides 10 of the lower clip 4 against the middle part 14 of the lower clip 4, a slide 20 takes off the lower clip 4 from the next clip of the game, which is, during of this detachment process, held in place by the guide surface 6. The pairs possibly acting on the clip 4 during detachment are intended to more firmly press the free ends of the sides against the bearing surface 2, so that set 1 keeps a correct position during this operation. FIGS. 2 and 5 simply represent a vertical section of the elements of a pricking head important for the

  understanding of the invention. The parts of the stitching head necessary for guiding the various movable elements 35 have not been shown.

  The stitching head 30 has two slides 31 separated from each other by a certain distance. Opposite faces

  sées, parallel to the plane of Figure 2, of the two slides 31, are separated by an interval slightly smaller than the distance between the two sides of the staples. The slides 31 are guided and driven in such a way that they move, as shown in FIGS. 2 to 5, from right to left and vice versa. In FIGS. 2 to 5, the sliders 31 are roughly in the form of a narrow rectangle, the upper right corner of which, however, has been removed so as to form (cf. also fig. 6) 10 a bearing surface 32, parallel to the direction of movement of the slide 31, and an abutment surface 33, perpendicular thereto. When detaching a staple still glued to the set 10, the abutment surface 33 meets the internal face of the middle part of the staple, the staple detached from the set 15 remains integral with the bearing surface 32 and is transported in this way by moving the slide until the middle part of the clip 4 is flush with the stitching channel 34. During the broaching, the clip is ejected by the

stitching channel 34.

  A pusher 36 slides vertically. Its upper end is intended to allow the engagement of a drive element when the stitching head must be actuated by a machine. The pusher 36 is connected by a rod 25 37 to a pusher 38 sliding vertically. The pusher 38 is used to eject the clip 4 through the stitching channel 34 and thus carry out the stitching process. When the pusher 36 is in the downward phase, it moves the pusher 38 downward. However, when the pusher 38 is located, as in FIG. 2, in its initial position, it is still so far from the clip 4 that it is possible to use the stroke which it must perform before reaching it to lower two tilting pushers 40, sliding them -also vertically. During this process, the tilting pushers precede the lower end of the pusher 38 and can therefore tilt downward, anticlockwise

  shows, the sides of clip 4 around its medial part

  diane acting as a tilting axis, if the clip 4 is still, following its friction against the parts of the device, in an oblique position, as shown in FIG. 2. To carry out this operation, the two tilting pushers 40 run along the outer face of the two slides 31 and meet the sides of

clip 4.

  Fig. 3 describes the device in a position such that the tilting pushers 40 have arrived at their lowest point, the surfaces 42 contiguous to the clip 4 constituting an extension of one of the limiting surfaces of the stitching channel 34. Figure 3 shows the pusher 38

  just above the middle part (or back) of the clip 4.

  Continuing its downward phase, the pusher 38 exceeds the tilting pushers 40 because the fixed pusher 36-pusher unit 38 is simply driven by friction with the tilting pushers 40. The friction drive 20 is provided by a spring 44 placed on the rod 37 and which presses a friction plate 46 against the left face (in the drawings) of a stop piece 43 of the tilting pushers 40. The rod 6 is placed in an oblong hole 48 so that, when the tilting pushers 40 abut against a surface 50 of a main part 52 of the stitching head, the pushbutton 36 and the pusher 38 can continue their downward movement, since the sliding coupling thus described slides. During its downward movement, the pusher 38 ejects the clip 4 from the stitching channel 34 and pricks it through a stack of paper not shown, the sides of the clip 4 being bent by a matrix located under the stack of paper and

also missing from the figure.

  Just before the pusher 38 meets the middle part of the clip 4, the sliders 31 are moved to the left, until they return to the position described in FIG. 4, where the middle part of the new lower clip of the set 10 can then fall back and come

  rest on the bearing surface 32 of the slides 31.

  Fig. 4 shows the pusher 38 at its lowest point.

  When the pusher 36 again enters the ascending phase, it causes with it, due to the friction coupling described above, the tilting pusher 40 and the pusher 38, until the stop piece 43 of the tilting pushers 40 reaches a stop 55 disposed 10 fixedly in the stitching head, and that its descending course is thus stopped. Fig. 5 shows the position of the various parts of the device at this time. At this moment, the slides 31 have already detached the next clip from the set 10 and have carried out approximately half of the distance to travel to reach the position described in the

fig. 2.

  As the pusher 36 continues its upward movement, the pusher 38 continues to move upwards and the sliders 31 to the right, until reaching the position described in FIG. 2.

  The stroke of the sliders 31 described above is generated by the slider drive device 31 sui25 vant, simply shown schematically. At the lower end of the pusher 36 is provided a projecting part 60, protruding to the right, and comprising an orifice 62 arranged parallel to the direction of movement of the pusher 36, and in which a rod 64 slides. The rod 30 64 comprises at its upper end a plate 66 serving as a stop. A compression spring 68 of cylindrical shape is disposed on the rod 64, between the plate 66 and the projecting part 60. A stop plate 70 is fixed to the rod 64, under the projecting part 60, and allows the 35 rod 64 to slide upwards relative to pusher 36 until the stop plate 70 comes to rest against the projecting part 60, as described in FIG. 4. The rod 64 also comprises at its lower end a stop plate 72, above which a bush 74 slides along the rod 64. A cylindrical compression spring 76 is placed between the stop plate 70 and the bush 74. An articulated lever 80 is integral with a pivoting bearing 82 located in a main part 52. In the example given, the articulated lever describes an elbow of 90. One of the arms 84 is articulated, at its free end, by the bush 74. The free end of the other arm 86 is connected to a link 88, in turn connected to the left end 10 (in the figure ) of the slides 31. From the rest position, shown in FIG. 2, o the upper spring 68 is strongly compressed, and the lower spring 76, on the contrary, practically relaxed, the upper spring 68 expands during the downward movement of the pusher 36, and, until the pusher reaches the position described in fig. 3, the lower spring 76 is not further compressed. This is why the sleeve 74 and the slides 31 remain in the same position. When the pusher 36 continues its downward phase (fig. 4), the stop plate 70 descends and compresses the lower spring 76, thereby actuating the articulated lever 80 and making the sliders 31 move back. When the pusher enters the ascending phase (fig. 5), the upper spring 68 drives the rod 64 upwards, the stop plate 70 remaining attached to the protruding part 60 under the action of the spring 76. The lower stop plate 72 of the rod 68 slides the socket 74 and thus pivots the articulated lever 80 anticlockwise, which causes the sliders 31 to move again to the right. These continue to slide when the pusher 36, continuing its upward movement, finally returns to the position shown in FIG. 1. The opening 62 is of such width that the rod 64 can oscillate somewhat in it. In the rest position, the slides 31 prevent the staples from leaving the store where the sets of staples 10 are arranged, and from accessing other parts of the device, which makes it possible to avoid possible breakdowns. When the stitching head is in this rest position, the clip 4 supported in FIG. 2 by slides 31 east

  also immobilized and cannot leave its position due to the fact that the part delimiting on the right the stitching channel 34 protrudes above the middle part of the clip 4.

  During operation of the device, it is possible to reload the vertical magazine, formed by the guiding elements 6 and 8, and in which the sets of staples slide

  down, under the action of gravity.

  The reference numbers contained in the claims are not limiting, but are intended to facilitate understanding.

Claims (12)

Claims   1. Stitching head used for stapling flat stacks of paper by means of a U-shaped staple, having on one side two flanks and, between them, a middle part, and provided with a magazine arranged 5 more or less vertically and intended to receive sets of staples composed of a number of staples arranged parallel to each other and detachable, a separation device used to detach a staple from the game by acting on its middle portion, and a pusher, which acts on one of the staples of a set which has been detached so that it pricks the stack of paper to be broached, characterized in that the stroke of the separation device is such that it detaches the clip by action on the internal face of the middle part of   the latter, and that the pusher (38) constitutes a separate element from the separation device.   2. tapping head according to claim 1, characterized in that the direction of movement of the separation device forms with the direction of movement of the pusher (38) an angle different from 0 and that a device is provided for tilting.   the clip (4) detached from the clearance (10) by the value of the angle indicated.   3. tapping head according to claim 2, characterized in that the angle is of the order of 90.   4. tapping head according to claim 2 or 3, characterized in that the tilting device is designed such that the middle part of the clip acts as the tilting axis of the clip.   5. tapping head according to claim 4, charac-   characterized in that the separation device has at least one slide (31), the abutment surface (33) of which comes, at the start of the detachment phase of the staple from the game (10), in contact with the face inside of the middle part of the clip, and the bearing surface (32) of which supports the free front face of the middle part of the clip again glued to the game.   6. tapping head according to one of claims 2   5, characterized in that the clip tilting device has a tilting pusher (40) sliding more or less parallel to the direction of movement of the pusher (38) and serving, after tilting the clip, to guide the staple   to be bitten by the pusher.   7. tapping head according to one of the preceding claims, characterized in that a device for driving a slide (31) of the   separation is designed so that the slide (31) is no longer in contact with the clip after the tilting device has tilted the clip.   8. tapping head according to one of the preceding claims, characterized in that a slide (31) of the separation device is equipped with a drive device which separates the slide from the clip before the latter is not ejected by the pusher (38).   9. tapping head according to claim 8, characterized in that the drive device has at least one spring (68, 76) coupled to the pusher (38) of the tapping head.   10. tapping head according to claim 6, charac-   terized in that the pusher (38) is coupled by   friction on the tilting pusher (40).   11. tapping head according to claim 1, characterized in that the separation device has at least one slide (31), the abutment surface (33) of which comes, at the start of the detachment phase of the staples from the game (10 ), in contact with the internal face of the middle part 10 of the staple, and whose support surface (32) supports the free front face of the middle part of the staple still glued to the game, on the side of the staple to be detached opposite the other staples in the game, in that the slide is driven in such a way that after detaching the staple from the other staples in the game, it moves the staple until the middle part of the latter is flush with a stitching channel (34), the stitching channel (34) being intended to guide the staple during its ejection by the pusher (38), in that a tilting pusher (40) is frictionally coupled to the pusher (38), the pusher sliding more or less parallel to the direction of movement of the pusher (38), meeting the clip e before the pusher (38) when moving it in the direction of the staple, causing it to tilt, and serving to guide the staple to be ejected by the pusher after tilting it, in this that the slide drive device (31) is designed in such a way that it separates the slide from the clip before the pusher (38) ejects it, in that a drive device of the slide (31) has a rod (64), on which are arranged two compression springs (68, 76), between which a stop plate (70) is fixed to the rod, in that the rod (64) slides more or less parallel to a vertically sliding pusher (36), in that a fixed articulated lever (80) is coupled at its end to a sliding bushing (74) located at   the lower end of the rod (64), and in that the other end of the articulated lever is connected to the slide (31) by a link (88).   12. stitching head according to one of claims   above, characterized in that the free front face 10 of a clip still glued to the game is, in the position suitable for detaching it from the game,   resting on the surface of a magnet.