US2064851A - Means for and method of separating sheet material - Google Patents

Description

Dec. 22, 1936. REIN'ARTZ 2,064,851

MEANS FOR AND METHOD OF SEPARATING SHEET MATERIAL -Filed Nov. 15, 1934 Patented Dec. 22,1936

MEANS FOR AND DIETHOD OF SEPARATING SHEET MATERIAL Robert Relnartz, OiIenbach-on-the-Main, Germany, assignor, by mesne assignmentsgto Arthur Wormser, Oflenbach-on-the-Main, Germany Application November 15, 1934, Serial No. 753,212 In Germany December 6, 1933 23 Claims. (01. 271-28) This invention relates to sheet separating devices for sheet feeding machines and has for its object to provide a device by which-the sheet separating effect of suction nozzles is improved.

, In the accompanying drawing:

Figure 1 is an elevation partly in section of a suction device embodying my invention;

Figs. 2 to 6 are diagrammatic sections of the device shown in: Fig, 1 with certain parts omitted for the sake of clarity, indicating successive positions of the device during its operation;

Figs. '7 to 10 are similar sections of different modifications of my invention.

In the bearings I, 2 of a fork 3 a cylindrical suction nozzle 4 is supported to the interior 5 of which a, suction effect is applied by a flexible tube 6. The vertical and horizontal motions of the fork 3 and the rocking of the suction nozzle 4 around its axle I are dependent on the manner'of application of the suction device in thefeeding machine, and need not be described in detail herein.

On the axle i of the suction nozzle 4 is loosely mounted a specially shaped arm 8 which by means of a connecting rod .9 is given a rocking motion around the axis of the suction nozzle. A small rod I is fixed to the arm 8 so that said rod continuously moves concentrically to the axis of the suction nozzle 4 close to its cylindrical surface.

The operation lows:

In Fig. 2 the suction nozzle is near the stack l I of sheets 13 so'that the opening l2 or a series of openings disposed on the surface of the suction nozzle 4 parallel to its axis touches the stack or is near the point of contact'The connecting rcd 9 has brought the arm 3 in such a position that the separating rod 10- is on the right of the openings l2 and does not touch the surface of the stack or touches it only slightly.

Now suction is applied and the nozzle 4 is slightly raised as shown in Fig. 3, so that the separating rod I!) which now begins moving to the left from the position shown may enter between of this simple device is as folthe suction nozzle 4. This motion is shown in Figs. 4 to 6 which are selfexplanatory. The reason for the improved separating effect of this motion of the separating rod may be explained by. the fact that the deflection of the sheet runs over its surface like a wave and by the fact that temporarily the sheet is slightly lifted from the suction opening and the suction effect is much diminished (Fig, 4.)

While the rod I0 is passing between the suction nozzle and the pile, the vertical motion of the suction nozzle may be interrupted as shown in Figure 4. The nozzle 4 is suitably supported by a pair of levers l fulcrumed' at [6 and engaging the axle 'I. The other end of the levers is provided with a roller I! held in contact with the cam l8 by the resilient means 20. The cam is rotated to cause vertical movement of the nozzle but the contour of the cam is such as to provide for an interruption in the vertical movement at a predetermined point in the movement of the separating rod in. The effect of this interruption is that excess sheets gripped by the suction nozzle, must fall back a small distance only; but if time enough is available the suction nozzle may raise without any interruption.

In the modifications shown in Figs. 7 and 8 the separating rod I-" has not a circular section,

but a section ,similar to a mushroom or to a,

' crescent. Experience has shown that very thin the suction nozzle 4 and the top sheet l3. The

nearer the separating rod Ill comes to the openings l2 the more the sheets l3, sucked on by the nozzle, are deflected. The effect of this deflection is that one or more excess sheets sucked on fall down. Generally the motion of the separating papers are sucked into the sharp angle between the suction nozzle and the separating rod and may be mutilated. This is prevented if the knifelike part of the profile of Figs. 7 and 8 fits closely to the surface of the nozzle. But as in this case the large surface of contact between the separating rod and the suction nozzle would completely close a single series of openings l2 and therefore as it is to be feared that the correctly sucked on sheet would fall down when the machinemoves slowly, a second series of openings I4 is provided at such a distance from the principal serlestof openings [2 that at least one series ofi openings is always open. The second series of openings may consist of smaller holes than the principal openings such as is shown in Figs. 7 and 8.

In Fig. 7, l5 designates a finger which presses down the surface of sheet I3 while the rod. l0 passes between the suction nozzle and the sheet( In spite of the fact that the separating'rod' l0, causes the sheet l3' to participate in its motion far less than might be anticipated so that in general it is unnecessary to hold the sheet l3, in some cases it is desirable to prevent any'shifting of the sheet l3 relatively to the nozzles I2.

The separating effect may be further assisted by a rocking of the'suction nozzle 4 around the axle 'I. In this case the total stroke of the separating rod I0. may be so long that it has completely passed by the openings after the suction nozzle has been rocked as shown in Fig. 9.

Instead of being cylindrical, the suction nozzle may be provided with a fiat suction plane as shown in Fig. 10. In this case the separating rod l0 moves to and fro in a horizontal path. ,The suction nozzle 4 provided witha separating rod l0 like any other one may be disposed in the middle of a sheet edge or near the corner.

'In the first case it is desirable to move the separating rod from inside against the edge and in the second case against the corner.

I claim- I. A separating device for sheet feeding machines comprising a suction nozzle mounted adjacent a stack of sheets for sucking the sheets from the stack, and a member movable parallel to the face of said nozzle and between the nozzle of the stack to deflect the sheets from the nozzle whereby excess sheets sucked from the stack are released by the nozzle.

3. A separating device for sheet feeding machines comprising a suction device having" a suction aperture therein and movable in close proximity to a stack of sheets to be separated, and

anrod movable above said stack parallel to the face of said suction device, between the suction aged sheet and said aperture for deflecting sheets from the suction device.

4.. A separating device for sheet feeding machines comprising a nozzle member having a series of apertures therein for sucking sheets from a stack arranged beneath the apertures, and a deflecting rod movable between the suction engaged sheet and, said apertures parallel to the face of said nozzle member for deflecting the sheets from the nozzle.

1 5. A separating device for sheet feeding machines comprising a nozzle member having a series of apertures therein for sucking sheets from a stack arranged beneath the apertures, and a deflecting rod movable above the stack parallel to the face of said member and between the suc tion engaged sheet and said member and having a profile section which clings knife-like to the nozzle member.

6. A separating device for sheet feeding machines comprising a nozzle member having a plurality of series of suction apertures suitably spaced apart, and a deflecting member movable between the suction engaged sheet and said member and parallel to the face thereof for successively cooperating with different series of apertures. l

7. A separating device for sheet feeding machines comprising a vertically movable nozzle member having a series of apertures therein for sucking sheets from a stack arranged beneath the apertures, adeflecting rod movable beneath 'said apertures for deflecting the sheets from the nozzle, the'n ovementof said nozzle being interrupted during the passage of the deflecting rod beneath the apertures.

8. In separating mechanism for sheet material, the combination of means for causing sheet material to be withdrawn from a pile, and means located exteriorly of said aforesaid means and movable between the latter and a sheet being in contact therewith for separating the second sheet from the first sheet if a second she adheres-to the first sheet.

9. A separating device for sheet feeding ma: chines comprising a suction nozzle mounted adjacent a stack of sheets for sucking the sheets from the stack, and a member located exteriorly of said nozzle and movable between said nozzle and a sheet directly engaged thereby to deflect.

the sheet from the nozzle to release excess sheets thereunder.

'10. The method of separating the top sheet from a stack of sheets consisting in withdrawing the top sheet from the stack, then partially stripping the withdrawn sheet from the separating means by buckling it for separating a second sheet from said withdrawn sheet if the second sheet adheres to the latter sheet.

11. .The method of separating thetop sheet from a stack of sheets consisting in withdrawing the top sheet from the stack, then deflecting the withdrawn sheet from the separating means by bucklingdt for separating a second sheetfrom said withdrawn sheetif the second sheet adheres to the latter sheet. i i

12. The method of separating the top sheet from a stack of sheets for the purpose of ad-.

vancing sheets to a sheet handling machine, consisting in engaging the top sheet of a stack by a pneumatic member, raising said pneumatic member together with a sheet above the level of said stack, moving a member parallel to the face of said pneumatic member and between the latter suction member between the latter and the sheet engaged thereby and across the suction aperture or apertures thereof, to thereby deflect said sheet from said suction member for the purpose of releasing any excess sheets adhering to said top sheet. A a I 14'. The method of separating by suction the top sheet from a stack of sheets consisting in withdrawing the top sheet from a stack by, .suction, temporarily slightly lifting said sheet from suction influence, and deflecting said slieet from the, exterior of the suction medium for the purpose of releasing any excess sheets adhering to said top sheet. r v

15. In a separating mechanism for sheet material, the combination of relatively movable means comprising, a suction member having an air opening for withdrawing sheet material from a pile, a sheet deflecting member located exteriorly of said suction member and adapted to partially seal said opening in said suction member and deflect a sheet engaged directly and held' by said suction member until the end of the relative movement of said means from thelatter for the purpose of removing amember parallel to the face of said F leasing any excess sheets adhering to said sheet.

16. In a separating mechanism for sheet material, the combination or relatively movable means comprising, a suction member having an air opening for withdrawing sheet material from a pile, a sheet deflecting rod located, exteriorly of said suction member and having a diameter less than the dimension of the air opening in said suction member to partially seal said air opening and deflect a sheet engaged directly and held by said suction member until the end of the relative movement or said means from saidsuction memher for the purpose of releasing any excess sheets adhering to said sheet.

1'7.*In' separating mechanism for sheet material, the combination of means withdrawing sheet material from the pile, and means located exteriorly f said beforesaid means and arranged to move .between the latter and a sheet being in contact therewith up to a point adjacent to the sheet engaging part of said withdrawing means I 19. .In' separating mechanism for sheet material, the combination of means withdrawing sheet material from the pile, and means located exteriorly of said aforesaid means and arranged to move between the latter and a sheet being in contact therewith up to a point beyond the sheet engaging part of said withdrawing means for the purpose or deflecting such sheet Irom said withdrawing memberandreleasing therebyanyexcess sheetsadherlngtosaidsheet.

20. In a separating mechanism for sheet material, the combination of relatively movable means comprising. a sheet separating member arranged to engage and withdraw sheet material from a pile of sheets, and a deflecting member located exteriorly of said separating member and adapted to deflect the sheet, the relative movement or said members being terminated when said deflecting member and the sheet engaging part of said separating member are adjacent each other.

' '21. In a separating mechanism for sheet material, the combination of relatively movable means comprising, a sheet separating member arranged to engage and withdraw sheet material from a pile of sheets, and a deflecting member located exteriorly' of said separating member and adapted to deflect the sheet, the relative movement of said members being terminated when said defleeting member and the sheet engaging part of said separating member have reached a position opposite, each other.

22. In a separating mechanism for sheet material, the combination of relatively movable means comprising, a sheet separating member arranged .to engage and withdraw sheet material from a pile of sheets, and a deflecting member located exterioriy of said separating member and adapted to deflect the sheet held by said separating member until after said deflecting member and the sheet engaging part of said separating member have passed each other.

23. In separating mechanism for sheet material, the combination of a member for withdrawing sheet material from a pile of sheets and means located exteriorly of said aforesaid member and movable between the latter and a sheet being in contact therewith i'or. deflecting said sheet from said withdrawing member, and means for interrupting the movement of said withdrawing member during movement of located means.

'- ROBERT REINAR'IZ.

said exteriorly

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