DE1561154A1 - Sheet removal device - Google Patents

Description

PATENT Attorney DIPL.-ING. H. E. BOHM

703 BDBLINCEN StNDELFINGEB STRASSE 49 FtRNSPBECHER (07031) 6613040

Boeblingen, March 9, 1967 ki-sch

Applicant: International Business Machines

Corporation, Armonk, N »Y» 10504

Official * file number: New registration file »of the applicant in Docket 25 617

Blatte nt take care

The invention relates to a device for removing each top sheet of a stack of sheets by means of a cyclically moving suction device.

Such a removal device is known from the American patent specification 2,348,073. The leaves are dated Stacks are pulled and transported to one or more processing stations, in which the sheets undergo various processing operations must undergo, for example, printed, punched, »folded, read, reproduced, counted or classified will. This peeling off the top sheet of a stack leads to difficulties if the leaves are relatively thin and slack.

Docket 25 617 ÖÖ9816 / Ö142

1661164

tend to withstand tensile forces, so that the frequency of the Damage to the same increases sharply, especially when the Leaves with irregularities or minor damage have already passed due to their previous types of treatment, z. B * if the sheets have previously been provided with manual entries are »Small tears or gaps reduce the resistance» ability of the material and do the utmost care in the subsequent machining of these? Sheets required. In the known device, the sheet is removed from the Stack subjected to tensile or shear forces, so that said The requirement for special care is not met "

It is the object of the invention to create a device for removing sheets, the pneumatic suction device of which with the length * sucked leaf edge execute a flow movement, d * h. the single ones Parts of a sheet are accelerated one after the other, so that the sheet is largely spared from tensile forces «This task solves the invention by driving the suction device Gear, which the 'gripping the sheet at its front edge Suction device imparted a cycloidal movement with the direction of the cycloidal path toward the rear edge of the sheet Progress * Accordingly, in an apparatus constructed in accordance with the invention, the first sheet of the stack becomes gradual as it is unrolled moved, d. H. the individual parts of the sheet are set in motion one after the other, so that not the entire sheet begins to move at a point in time «. The first moving part

BADORIGINAt,

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Docket 25 617 009816/0142

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of each leaf runs normal to the plane of the leaf and thus normal to the level of the second sheet. The part of the first sheet that has already been lifted off the stack and is gradually moving towards it moved above, is evenly curved at every point. Of the Starting point of the sheet that has already been lifted from the stack, the speed "gradually" increases in the curved part and thus the tangential component of the 'speed' gradually increases with the radial component decreasing. The highest Point of the Sykloldic way. Reaches the speed its maximum and the direction is purely tangential, so that the sheet the transport device with a fallen on IJuIl Radialgeschwindigkelt reached. In this way there is danger the damage to a leaf is reduced to the greatest possible minimum, so that thin, slack leaves from this device. " safely "and flawlessly lifted from the stack" and handed over to the sports facility can be.

According to an advantageous embodiment of the egg findunc is a second four-bar drive -provided, on the swingarm one Suction device is attached and a spring engages on its crank for pivoting in one direction of rotation and εu: n pivoting in the other direction of rotation an arm rests on a shaft that can be rotated, which is also non-rotatable The crank of the first four-bar linkage takes up and the free the .Ku-rcel .. 'of the second four-bar mechanism is rotatable, wherein the second four-bar linkage is designed such that

Docket 25 ... SiT;., - _: ,,;: "; 0 0 9 816/0 1 4 2

about the first suction device located halfway above the stack the suction device connected to the second four-bar linkage is directly opposite, in such a way that the Suction openings of the two suction devices are facing each other. It is true through the American patent 1,539,083 the use of a second periodically moving suction device is known, but this device is only used for intervening and stripping off an accidentally lifted second sheet, whereas the second suction device in the case of the invention Device holds the sheet in the same position until the first Suction device returns to her and takes over the sheet before moving back to the stack.

Further features of the invention can be found in the claims.

Details of the invention are described below using an exemplary embodiment illustrated in the figures. It demonstrate:

Fig. Ι a removal device in a diagrammatic representation and

ric. 2 shows a front view of the device with only schematically indicated suction devices and part of the transport device to which the lifted Sheets are passed.

0 0 9816/0142 BAD QRJQiNAi.

Docket 25 617. . ■ -

"The first suction device 1 consists of the tube 2 made of a light material, e.g. aluminum or plastic, which is equipped with several suction cups 3. The latter are evenly spaced over the length of the tube 2 and all suction openings point into the same direction. Each suction cup 3 is made of a pipe socket and the actual resilient cup 4, which is used for propagation of the negative pressure. the one end of the tube 2 is connected to open and the tube 5 with the vacuum control unit 6. the \ latter is also connected via the Hose 7 connected to a vacuum source (not shown) The valve 8 of the vacuum control unit 6 can be operated mechanically and hereby alternately connects the hose 7 to the hose 5 or to the opening 9 pointing into the ambient atmosphere 8 to hold in the position shown in which the suction device 1 is connected to the vacuum.

The tube 2 of the suction device 1 is attached at its closed end * to the central arm 15 of three arms 14, 15, 16 articulated to one another. The arm I ¹ I is provided with the hub 17, which is firmly connected to the shaft 18, which is mounted in a bore of the only partially shown frame 1 $. The arm 16 is pivotably mounted on the bolt 20, which is also fastened in the frame 19. The end of the arm 14 is hinged to the arm 15 with the aid of the bolt 21 and the end of the arm 16 with the aid of the bolt 22, the position of which is thus determined by the two arms ΪΗ, 16. ;

Docket 25 617 009818/0142

The arms 14, 15, 16 form a four-bar linkage. On one Point of the arm 14 engages the rod 23, which is through the eccentric 24 is driven so that the arm 14 performs a reciprocating pivoting movement. The eccentric 24 is through the Belt 25 driven. The arm 14 is a double-armed lever, the other arm 26 is equipped with the leg 27, the interacts with the button 28 of the 3/2-way valve 8. With this one The 3/2-way valve 8 will interact against the spring 10 moved so that the suction device 1 from vacuum to atmospheric pressure is switched. In order to be able to precisely determine the point in time of this switchover, the vacuum control unit 6 is at the Frame 19 fastened by means of an elongated screw connection. '

The stack of sheets 31 lies on a suitable one, not shown Platform on. This platform can be moved vertically and this displacement is dependent on the height of the The stack of sheets is automatically controlled so that the top surface of the Stack 31 is permanently at a constant height. Keeping the stack height constant in this way is known and is as it does not form part of the invention, not described in detail.

In order to transport the sheets removed from the stack of sheets, the transport device 34 is provided, which the from the suction device 1 taken sheets takes over and to transported to various processing stations. The transport device 34 (Fig. 2) has the perforated endless Belt 35 on, which over the driven roller 36 and another,

009316/0142

Docket 25 61?

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not shown tension roller is performed. above the '37 portion of the strap 35 »which is directly opposite the stack 31 is the one with the perforated bottom 39 provided vacuum chamber 38 arranged * In Another wall of the chamber 38 has openings 4o, which are connected to the vacuum tube * »1. Thus, the lower Attach part 37 of belt 35 to nearby leaves and take away.

In the position of the four-bar linkage 14, 15, 16 shown in FIG. 1, the suction device 1 is located opposite the edge of the first top sheet .32 of the sheet stack 31. The flexible cups' k lie on the sheet 32, and there the vacuum control unit 6 the suction device Ί connects to the vacuum, the sheet 32 is pulled against the suction cups. As a result of the drive of the eccentric 24, the arm Ik begins to pivot in a clockwise direction. The arm 16 is pivoted at the same time over the arm 15 in a clockwise direction. The arm 15 is here also rotated in a clockwise direction according to the transmission ratio specified by the four-bar linkage. Consequently, the suction device 1 attached to the arm 15 is moved from the position la (FIG. 2) to the position Ib and from there to the positions Ic and Id. The four-bar joint I ¹ *, 15, 16 is designed in such a way that the suction device 1 describes a VJeg which corresponds approximately to an eycloid. From Fig. 2 it can be seen that during this movement the suction device 1 also changes its position, i. hey that there are many oils in position la downwards, in position Ib afterwards

Docket _a5 6 "009816/0142. 'BADOR _IGINAL

left, in position lc upwards and in position Id inclined downwards top right. The movement is ended in position Id. The vacuum detects the edge of the sheet 32, which must follow the movement described above, whereby an internally increasing part of sheet 32 is unrolled from the stack. During this unwinding process, the sheet 32 does not slide over the second sheet, since the sheet 32, as it were, wraps around a cylinder rolling over the stack.

The Lap; e Ic is the highest point of the cycloidal path of the Suction device 1 and the speed is here arr. Greatest. At this moment, the vacuum control unit 6 switches the suction device by Vakuurr. to atmospheric pressure. In the position 32c, the leading edge of the first sheet 32 confronted in the effective area the suction belt 32, whereby the sheet is completely unrolled from the stack 31 and finally transported on. The suction device 1 descends during its movement to the position Id, in which the sequence of movements is reversed «If long leaves can be taken from the stack, the position Id can be moved further to the right moved so that more time is available for the completion of the unwinding movement of the first sheet. By doing remaining part of the bev-fugungs cycle of the suction device 1 reverses the same from the position Id via the positions Ic and Ib back into the Starting position la back.

The described performance effectively removes large slack Sheets from a pile. The first or top sheet never slides *

008816 / 0U2

Docket 25 617

BATH ORIGINAL

-mais over the leaf underneath, "- as-already above is described. This creates the possibility that, a second. Sheet with the first lifted off the stack is largely switched off. When sliding a sheet is between the same and the one below creates friction, through polygamy that ■ The sheet underneath can possibly be taken away. The one here the resulting electrical charge supports the sticking together of leaves. By unrolling the top sheet as described, by gradually lifting off from the one below, a sticking of leaves is almost impossible, even if the surfaces of the touching leaves show cracks and traces of sticky substances.

A second suction device 45 can be provided which has the tube 46, the open end of which is connected to a vacuum source via the hose 47, without completely excluding the occasional simultaneous unrolling of two sheets under the most unfavorable conditions. The tube 46 is provided with a number of suction cups 48 ″ and is fastened with its closed end to the arm 49 of the four-bar linkage 49, 50, 51. the first-mentioned four-bar linkage 14, 15, 16 serves as a fulcrum; the arm 51 is mounted on the shaft 18 such that it can rotate freely. The two ends of the arm 50 are _{articulated to the arms 5I 8} 59, the arm 4 £ being pivotable about the bolt 52 fastened in the frame 19. The frame 19 has the rectangular opening · 53 and the recess · 54 · on its outside in order to create a space for 'the arm 50'.

ÖQ984S / ÖH2

Docket 25 617 BATH

to leave when the four-bar linkage 49, 50, 51 moves - This makes it possible to arrange the arms 49, 51 on different sides of the frame I9. The spring 55 tries to pivot the arm 51 clockwise. ^{However, the movement of the arm 51 is limited on} the one hand by the leg 56 of the arm 57 and on the other hand by the stop 59 on the frame 19. The arm 57 is firmly connected via the: iabe 5Ö with -der, UeHe 18.

The movement of the four-bar linkage 49, 50, 51 is controlled by the movement of the four-bar linkage 14, 15, 16. The arm 57 is connected to the arm 14 via the V.'elle 18. ¹ Jenn. thus the arm 14 moves in the clockwise direction of rotation, the Arn 57 is pivoted in the same direction of rotation, whereby the. Poor. 51 is allowed to move under the influence of the spring 55 in the same direction of rotation until the arm 51 strikes against the stop 59. This movement of the arm SI causes the arm 49 to move in the opposite direction. is pivoted opposite to the clockwise direction of rotation, whereby the second suction device 45 is moved from the position 45a (FIG. 2) into the position 45b. The first suction device 1 is now in position 1b, so that at this moment both suction devices face each other with their suction openings facing each other on one side / ues-edge of the first unrolled sheet 32b. _{The ( .;} Suction device 45 has a lower suction effect than the suction device, so that the latter will hold the sheet on, hold it and transport it further

Docket 25 617 009816/0142

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If sheets of paper have accidentally unrolled from the stack, has an effect the full suction effect of the second suction device 45 second sheet so that it is held in this position, until the first suction device over the layers Ib, Id and again Ic until the position ib has moved back. The first suction device 1 is now connected to the vacuum again and takes over the sheet 5 "0 from the suction device 45 * Now the second suction device returns empty back from position 45b to position 45a, as a result that caused by the arm 57 against the force of the spring 55 Counterclockwise rotation that occurs when the arm 14 is also pivoted clockwise. The first suction device moves from position Ib and bercest the sheet 60 back onto the stack 31, followed by a new pick cycle starts if not the. Drive by the excenter 24 is switched off, the device according to the invention is also then fully functional if they are not in the figures 1 and 2 are arranged 1st, i. H. it can too Leaves are taken from Ölattstapeln, the surface of which is not in a horizontal position.

Although a quarter-turn gearbox is preferred for the drive Suction device is envisaged, it is of course also aöjlich, uie invention & s-e ^ i ^ e sycloidic rolling motion of the to be removed Sheet by means of other gear * 2. Bv by means of a in a Filhruni: reciprocated, on the top sheet of the stack rolling wheel to achieve. In this case it is

Covers 25 eggs '00dst6 / 0142

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it is advantageous to transfer the suction work to the wheel itself, d. h «to train this wheel as a suction wheel.

Docket 25 617 0 0 9816/0142 _BAD

Claims (8)

Claims f 1 \ / device for. Removal of the uppermost Blatfc.es of a ^^ Blattstap.el "s by means of a cyclically moving suction device, characterized by a gear (14, 15, 16) which drives the suction device (1) and which the sheet (32) on its front The edge-gripping suction device (1) is given a cycloidal movement, the direction of the cyclical path being towards the rear edge of the sheet (32). 2. ■ device according to claim 1, characterized in that im above your - sheet stack (31) highest point (Ic) of the cycloledic Trajectory (la, Ib, ic, Id) of the suction device (1) the same a transport device (3 * 1) for the purpose of transferring the lifted sheet (32) opposite and that this transport device (3 ^) has a transport speed, which is the same as the speed of the suction device (1) in said point (Ic) of its path (la, Ib, lc, Id). 3. Apparatus according to claim 1 and 2, characterized in that the web speed of the suction device (I) - up to that above the stack of sheets pi) highest point "(Ic) of the cycloid path (la, Ib, lc, Id) increases, 4. Device according to claims 1 to 3 »characterized in that that the suction device (1) is a suction wheel whose BATH ORIGINAL Docket 25-617 009816/0142 - i4 - Axis in a guide parallel to the stack surface (3I) is displaceably and rotatably mounted, whereby a gear engages for the displacement movement of the axis on the same » 5. Device according to claims 1 to 3 | characterized, that the gearing (1 * 1, 15 * l6) represents a four-bar linkage, of which the suction device (1) load-bearing coupling (15) performs the cycloidal movement. 6. Apparatus according to claim 5, characterized in that the crank (I ¹ I) of this four-bar linkage (I ¹ I, 15 "l6) is ^{in drive connection with an eccentric (2 1} O") 7. Apparatus according to claim 1 and 5, characterized in that a second four-bar linkage (49, 50, 51) is provided, a suction device (45) is attached to its rocker arm (49) is and on the crank (51) for pivoting in one direction of rotation a spring (55) engages and for pivoting in the other direction of rotation rests an arm (57) which sits non-rotatably on a shaft (18) which is also non-rotatable Crank (14) of the first four-bar linkage (14, 15, 16) receives and on the freely rotatable the crank (51) of the second Four-bar linkage (49, 50, 5I) is mounted, the second four-bar linkage (49, 50, 51) is designed such that about half the height above the stack (3D) the first suction device (1) with the second four-bar joint 0098 16/0142 BADORIGiNAt Docket 25 617 ^ - ^ 156115 « drives (49, 50 »51) connected suction device (45), directly opposite lies in such a way that the suction openings of the both suckers (1 and 45) face each other. 8. Apparatus according to claim 5 »characterized in that di-e Crank (14) of the four-bar gear driven by the eccentric (24) (14, .15 »16) embodies a double-armed lever, its free lever arm (26) with. one: 3- / 2 ^ Wegeventl.l (8) like this cooperates that in the highest position (Ic) of the suction device (1) starting over the stack of sheets (32) and -; over the red Yvusschwenkl & üe (la) of the aforementioned double-ainic lever (26.) back to the above-mentioned highest position (Ic), continuously the Suction device (1) from vacuum to normal atmospheric Pressure uia ^ it is maintained. 9 »University of Applied Sciences .; according to claim ^! ; and 7, cffdurch, -eken ^ Siichnet, that "each sow device (1 or 45) is attached to the corresponding track (lij or 49) of the quarter joint (1 ^, 1-5» 16 b.zK. 49, 50, ^c jl) attached, open on a ridge,; r> it αε: τι 3/2-way valve (S) fzv .. a vacuum; r.cuelle connected pipe (2 or 46) aar shows, in aas several alike ' Lothete "ear stubs which have at their free sins Näcli /: iebi £ e Sau ^ n 4 or 48) - show. BATH ORIGINAL 0 09616/0142 , -Ab '. Read 11 e