US 2085612 A
Description (OCR text may contain errors)
June29, G; sp s's SHEET SEPARATE 1G DEVICE Filed Feb. 8, less 5 Sheats-Shee t '1'" lnvenlbr:
SPIESS SHEET 'SEPARATING DEVICE Julie 29, 1937'.
Filed Feb. a, 1956 5 Sheets-Sheet z June 29, 1937-. G. sPlESS mm SEPARATING DEVICE.
Filed Feb. 8, 1956 5 Sheets-Sheet 3 Mvenfom I June 29, 1937. G. S:PIESS 2,085,612
SHEET SEPARATING DEVICE June 29, 1937;
G. SPIESS 2,085,612
SHEET SEPARATING DEVICE Filed Feb. 8, 1956 5 Sheets-Sheet 5 l l l Inventor:
Patented June 29, 1937 UNITED STATES PATENT OFFICE Application February 8, 1936, Serial No. 63,027 In Germany October 22, 1935 10 Claims. '(Cl. Til -+27) This invention relates to sheet separating devices for sheet feeding machines. I There are sheet separating devices known which grip the sheet on the edge directed away from the feeding direction and which are displaceable as a whole in the feeding direction along a guiding and supporting bar. In such separating devices the difierent operations required for the separation of the sheet from the pile are not derived from a controlling shaft displaceable with the separating device, but the control of the different working operations is effected in such manner that they, are brought about partly by means of the vacuum in the suction conduit arising during the sucking up of the sheet, through the medium of a shifting piston, and partly by means of a lifting bar extending in the direction of displacement and controlled by a lifting cam provided on a stationary control shaft. The allotment of control of the various operations in these known devices is such that by means of the vacuum in the air conduit the suction member together with the sheet sucked up from the pile is lifted up and the separating blo'weris brought into operative position, whilst by means of the lifting bar and control shaft respectively the forward movement of the suction member in the feed direction, the return of the suction member into the position of readiness and the return ofthe separating blower are con! trolled, the automatic switching on and off of the suction and blast air being effected in coordination with the different movements of the suction member and separating blower. With this arrangement of the separating device the vac uum in the suction conduit has to carry out a comparatively large amount of work, and the swinging-of the separating blower into operative position as also the return of the suction member into sucking upposition are effected by force closure.
The present invention proposes to provide a sheet separating device differing from these known devices in that the vacuum in the suction conduit brings about the tipping of the suction member together with the sucked-up part of the sheet, whilst the further necessary working operations, namely the raising of the suction member together with the sucked-up part of the sheet,
the swinging over of the separating blower into operative position, the forward movement of the suction member for the delivery of the separated sheet to the device for conveying it onwards, the return of the separating blower intoa position I of readiness and the return of the suction memher into sucking up position are brought about by a lifting bar extending in the direction of feed.
The arrangement is, according to the invention, suchthat the different devices and linkages are in positive connection with the lifting bar. The lifting bar itself may be in positive connection with the driving part of the control shaft in one or both directions of stroke. The switching on and off of the suction and blast air is effected auto- 'matical ly in dependence on the corresponding 10 movements of the suction member and the separating blower. i
The advantage of the arrangement of the separating device according to the invention resides in a considerable simplification of the construction 15 and operation, particularly when the sheet dimensions are altered, inasmuch as there is no gearing which has to be adjusted, whilst the suction power is lessened and all operations are positively controlled. 20
By way of example, one form of the invention is illustrated in the accompanying drawings, in which Figures 1 to 5 each show an elevation with certain details in section in various working positions, Fig.1 showing the device in the position 25 during the sucking upof a pile sheet; Fig. 2, in the tipping position of the suction member; Fig. 3, in the raised position of the suction member; Fig. 4, in the position before the beginning of the forward-movement; and Fig. 5, at the end of the forward movement of the suction member. Referring to the drawings, the support I of the separating device is slidably guided on the sup-- porting bar 2 extending in the direction of feed above the sheet pile, is secured against rotation 35 by a key 93 sliding in a groove 92 of the bar 2 tion cylinder 3 is mounted, the opening 95 of which is controlled by a slide valve 96 and is put in 40 communication in the position shown in Fig. 1 with a suction air space 98 through'the medium of a recessed part 91 of the slide valve, said suction air space being connected onthe one hand with ,the air pump and on the other hand, by 45 means of aconduit, not shown, with a pipe 99 on which the suction air'nozzles I4 are arranged. The nozzle pipe'BB is fixed to a lever Hill, which is forked atits lower end and the upper end of which is connected by an articulated bar "ll 5 with a fixed extension I02 of the piston 5 of the suction cylinder 3. The lever I00 is further pivotally connected at I03 to a lever Ill4, which is pivotally connected at its upper-end at I05 with I whilst the arm H3 is mounted on the shaft pin II which is journalled in the frame and provided witha second arm II I. The latter is pivotally connected by means of a link bar I I8 with the one arm of a two-armed lever I20, which is fulcrumed at H9 in the support I, and the other arm of which is pivotally connected to the bearing frame I2I of a roller triangle, the rollers of which embrace the lifting bar 43. a
The sucking-up position of the separating nozzles I4 shown in Fig. 1 is thus determined on the one hand through the positioning of the lifting bar 43 by means of the above-described linkage, and on the other hand by means of the position of readiness of the snifting piston 5, which it assumes under the action of a compression spring 50 through the medium of the linkage I00, IOI, I02. The position of the lifting bar 43 is determined by the lifting cam 50 and by the weight of the lifting linkage, assisted by, a spring 49 which might be replacedby a counter cam.
The stroke of the suction piston 5 is limited by a stop I23 provided in the interior of the suction cylinder 3. The sucking-up position (Fig. 1) of the suction nozzles I4, 1. e., the angular position of their suction surfaces with regard to the pile surface, is adjustable by means of an exterior adjusting stop I23 for the suction piston 5, which stop is, arranged at one end of an adjusting spindle I25 provided with an adjusting button I24 and guided on the cylinder body. In the position of adjustment of the stop I23 shown in Fig. 1 the suction surfaces of the suction nozzles are parallel to the pile surface, whilst in Fig. 2 a position of adjustment of the piston stop I23 is shown in which the piston stroke is shortened and in consequence of this the nozzles are slightly tipped in sucking-up position. This adjustment of the suction nozzles is for example suitable when the rear pile edge is rolled upwards. If, however, the edge of the pile is bent downwards, then it is advantageous to employ the oppositely inclined position of'the nozzles which is effected by bringing the piston stop I23 into the other limiting position-by means of the adjusting spindle I25 and thus increasing the piston stroke. The adjustment of the suction nozzles with regard to the pile surface is regulatable during operation, inasmuch as the suction cylinder 3 is mounted so as to be stationary.
The separating blower and pile feeling member for the adjustment of the pile transport, which consists of the holder 25, the pipe 28 and the blast nozzle member 30, forms the coupling of a rectangular linkage, the crank arm 23 of which is mounted so as to be capable of swinging around the fixed pin 22 and the wing 28 of which is mounted so as to be capable of swinging around the fixed pin 21 of the support I. Similarly, the S p rating blower and pile feelin'g devlce is subjected to the action of a spring I25 which has the tendency to swing it out of the position of readiness shown in Fig. 1 into the operating position shown in Fig. 4. The separating blower and pile feeling member is locked in its position of readiness (Fig. .1) against the action of said spring by a locking stop I2'I. Both the spring I26 and the locking stop I2I are mounted on a driving rod I28, which is pivoted at I29 to the curved coupling bar H2, and enclose a cubical sliding member I30, with which the free end of a second arm 23a of the crank 23 of the blower linkage is pivotally connected. The free end of the driving rod I 28 contacts byv means of a buffer I32 with the arcuate stop surface of a stop roller I35 mounted at the end .of a crank arm 23.
During the movement of the rectangular linkage II3, H4, H2 by means of the lifting bar 43, the coupling point I29 describes the path mm. In the course of this movement of the coupling point I29 the driving rod I28 acts in the first place as a, push rod against the roller I33, which is mounted on the link pin connecting the crank arm 23 with the holder 25, and thereby causes the blower and feeler to swing over in the first place into the position shown in Fig. 3 until the roller I33 slides off from the stop surface of the buffer I32. From this moment onward, the connection of the blower holder 25 and of the driving arm,23, 23a respectively with the driving rod I28, is caused to be a resilient one by the action of the spring I26 and as soon as theblowing nozzle member applies itself as a feeler to the pile, the spring I26 is compressed whilst the driving rod I28 slides without hindrance in the cubical slide member I30.
On a pin I34 fixed in the support I a bell crank lever I35, the one arm of which .is pivotally connected by means of a link bar I 36 with the link pin I3I, and the other arm of which is pivotally connected by means of a slotted link I31 with the suction air control valve 96, is mounted so as to be capable of swinging. In consequence of this connecting linkage, the air control valve is also displaced during the swinging motion of the separating blower and pile feeler and arrives finally in the position shown in Fig. 4 in which it interrupts the connection between the internal space of the suction cylinder 3 and the suction space 98 and established connection between the internal space of the cylinder and the external air by means of the control opening 95 and a flattened part I38 at its upper end.
The suction air space 98 connected with the air pump through a control valve, not shown, is further connected by a bore I controlled by a valve I39 with an air space I, which is connected by means of an air conduit, not shown, with a 'snifting cylinder which operates the control gear of the pile lifting device. The valve I39, which is held in closed position by means of a spring I42, is lifted off from its seating by striking against the end of the valve rod I40 by means of a carrier I43 provided on the control valve 96, when the foot of the feeler, in consequence of the diminished height of the pile surface, goes correspondingly 'far downwards (Fig. 4) until it comes to rest on the pile surface.
By displacement of the support I on the rod 2 andfixing the same in place the separating device is adjusted according to the dimensions of the sheet. By the displacement the parts of the separating device are not altered in their relationship to one another. In the position shown in Fig. 1, which is determined on the one hand by the cooperation of the lifting cam 50 and the spring 49, and on the other hand by the piston spring 5a and the piston stop I23, the sucking up of the sheet takes place after the space 98 and the nozzle pipe 89 leave been put in communication with the airpump Ia. During this time the loosening blower 20, 2| is in action whilst the separating blower 30 is inoperative. When the up-v permost sheet of the pile jumps up to the suction nozzles I4 and closes them, a vacuum is produced in the snifting cylinder connected with the suction nozzles by means of the space 08, the re- 1 cessed part 9Iof the control valve 96 and the cylinder control opening 95, whereby the piston 5 is drawn in into the cylnder while compressing the spring 5a. The movement of the linkage I 00,
IOI, I I0, I09 thereby produced causes a tipping motion of the suction member or members I4 around their front end together with the suckedup part of the sheet, as is shown in Fig. 2 v
During the upward movement of the-lifting bar 43 which now takes place owing to the action of the control cam 50, the rectangular linkage consisting of the parts II3, H4, H2 is set in motion through the medium of the roller triangle- I2 I, the driving lever I and the connecting linkage II8, II I, the point of application III of the coupling of the suction lifting linkage I29 and the moving linkage of the separating blowerand feeler describing meanwhile the curves indicated in the figure by the reference numerals I I la and I29a; respectively.
The lifting linkage for the separating suction member passes in the meantime first from the position shown in Fig. 2 into the position shown in Fig. 3, in which the suction member is raised but is not yet moved into the tipped position.
. Simultaneously, the driving rod I28 for moving the separating blower and pile feeler is displaced by the movement of the rectangular link coupling II2. At the commencement of this movement the rod I28 with its impact buifer I32 has positively initiated the movement of ,the separating blower and pile feeler 25, 28, 30. At the moment at which the impact buffer I32 has slid off from the roller I3I, the further drive of the separating blower and feeler takes place by force closure by the action of the spring I26 on the bell crank lever 23, I30. During this movement of the separating blower and pile feeler the lower" edge of its bowing nozzle describes the curve a, which runs approximately horizontally in its first part and nearly rectilinearly in its second .part.
In the further course of the upward movement of the lifting bar 43, the rectangular linkage I I 3, 2', II 4 moves into the position shown in Fig. 4.
During this movement no noticeable displacement .of the point of application III of the coupling of the linkage for lifting the suction member takes place, so that said linkage does not alter its adjustment with regard to the position shown in Fig. 3. On the other hand, the point of application I29 of the coupling of the driving linkage ing nozzle closing means is brought into the open position. During this movement of the separating blower and pile feeler, the control valve 96 is further displaced by means of theconnecting link I36 and the bell crank lever I into the position shown in Fig. 4, and the internal space of the shifting cylinder 3' is shut off from the air space 98 and put in communication with the open air by means of the 'flattened part I38. As a result of the release of the vacuum the piston 5 is returned under the pressure of the spring 5a path located surface.
movement of the tipping linkage IOI,' I00 assoelated therewith from the position shown in Fig. 4, the suction nozzles I4 are tipped back, so that their suction surfaces together with the suckedup partof the sheet again lie parallel or approximately parallel to the pile surface.
In Fig. 4 it has been assumed that the height of the pile surface inconsequence of the removal of the sheets has sunk below .the normal height necessary for the proper operation of the separating device. As a result of the larger descent of the separating blower and pile feeler thereby rendered possible in placing itself on the pile, the control valve 96 is displaced to a corresponding extent so that its carrier. I43 has lifted the is operated.
In the further course of the stroke of the bar 43, which is transmitted by means of the linkage I20, II8, III to the rectangular linkage II4, II3,'I I2, the point of application III of the coupling of the nozzle lever "I04 describes a curved to a greater extent horizontally in the direction of feed. This motion of the coupling point III is accompanied by a forwardly directed movement of the lower end of the nozzle lever I 04 and consequently of the nozzles I4 together with the sucked-up sheet, during which the nozzles are simultaneously guided by the tipping lever I 00 and the connecting linkage I09, H0 in such manner that the nozzle suction surfaces maintain their position parallel to the pile The path of the nozzle .tipping edge is indicated in the drawings by the reference nu- I meral I411.
In the position shown in Fig. 5 the sheet separated from the pile is gripped in known manner by the device for forwarding it onwards after the vacuum in the nozzle suction conduit has been eliminated by the opening of a valve flap in the suction conduit of the pump and consequently the sheet is released by the nozzles. Thereupon the return of the lifting bar 43 into initial position, shown in Fig. 1, begins, whereby the rectangular linkage together with the nozzle lever I04 connected with the coupling I I 2 and the driving rod I28 likewise connected with the coupling H2 and the driving rod I20 likewise connected to the coupling for the movement of the separating blower and pile feeler are returned into the initial position for the commencement of a new working operation.
I claim:. v
1. Sheet separating device for sheet feeding machines, comprising separating means engaging the rear of the pile of sheets including a nozzled separating suction member, a suction conduit for said member, an air pump connection with said member, the part of the sheet sucked up by said separating member being automatically lifted by the suction force arising in said conduit and a cylinder upon closure of the suction ope'ning by the sheet and the vacuum produced in said conduit during the sucking up of the sheet effecting the tipping of said suction member, a separating blower and pile feeler, a'lifting bar extending in the direction of feed and operating linkages conblower and pile feeler with said lifting bar for raising the suction member together with the sucked-up part of the sheet, swinging the separating blower and pile feeler into operative position, moving thesuction member to deliver the sheet and returning the blower and the suction member.
2. Sheet separating device according to claim 1, wherein a roller triangle positively connects the operating linkages of the suction member and of the separating blower and pile feeler with the lifting bar.
v 3. Sheet separating device according to claim 1,
wherein a coupling of a rectangular linkage controlled by the lifting bar controls the operating linkages of the suction member and the separating blower and pile feeler.
4. Sheet separating device according to claim 1,
wherein a separating suction nozzle is linked to the end of a nozzle lever and is guided on a tipwherein the nozzle together with the sucked-up part of the sheet is tipped back after the operation of lifting oil! from the pile before the beginning of the forward movement by the return of a tipping piston into initial position after the admission of air into a cylinder has been effected by the lifting bar, and the suction surface is again parallel to the pile surface.
8. Sheet separating device according to claim 1, wherein a slide valve controlling the pressure in a tipping suction cylinder is operatively connected with the, separating blower and pile feeler to I cause said valve during the duration of the position of readiness, of the'tipping and of the lifting movement of the suction nozzle and of the initial motion of the blower to maintain the interior of the .cylinder in communication with the suction conduit and during the period of rest of the suction nozzles to connect the interior of the cylinder with the open air.
9. Sheet separating device according to claim 1, wherein a slide valve controlling the pressure in a tipping suction cylinder is operatively connected with the operating and driving linkage of the separating blower and pile feeler to cause said valve during the duration of the position of readiness, of the tipping and of the lifting movement of the suction nozzle and of the initial motion of the blower to maintain the interior of the cylinder in communication with the suction conduit and during the period of rest of the suction nozzles to connect the interior of the cylinder with the open air.
10. Sheet separating device according to claim 1, wherein a control valve controls by means of a carrier a valve by means of which a snifting piston controlling a pile locking device is set in operation.
- GEORG SPIESS,