US2722416A - Separation of sheets of paper or the like from the top of a pile - Google Patents

Separation of sheets of paper or the like from the top of a pile Download PDF

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Publication number
US2722416A
US2722416A US225251A US22525151A US2722416A US 2722416 A US2722416 A US 2722416A US 225251 A US225251 A US 225251A US 22525151 A US22525151 A US 22525151A US 2722416 A US2722416 A US 2722416A
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Prior art keywords
gripper
pile
sheet
grippers
sheets
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Expired - Lifetime
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US225251A
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English (en)
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Backhouse Headley Townsend
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/08—Separating articles from piles using pneumatic force
    • B65H3/0808—Suction grippers
    • B65H3/0816—Suction grippers separating from the top of pile
    • B65H3/0825—Suction grippers separating from the top of pile and acting on the rear part of the articles relatively to the final separating direction

Definitions

  • the invention relates to machines for separating sheets of paper, card or other mateiialone at a time from the top of a pile and is concerned withlmachines of the kind in which a suction gripper is lowered ontoeach uppermost sheet in turn and is employed to grip and elevate a portion of the sheet and which comprises a co-operating piston and cylinder (or equivalent bellows or diaphragm and chamber) arranged for suction operation to effect elevation of the gripper, the machine having open connection betweeri'the mouth of the suction gripper and the cylinder when the gripper is lowered to engage a sheet and being so arranged that closing of the mouth of the gripper by engagement with the sheet serves'as a valve sealing the cylinder from the atmosphere and enables suction, usually already applied to the cylinder, to effect relative move ment between the piston and
  • the removing means may comprise a conveyor and the suction grippermay be arranged, after it has raised a portion of the uppermost sheet of the pile, to rnove in a directionover the top of the pile for the purpose of forwarding the sheet or assisting in the forwarding of the sheet to the conveyor.
  • the conveyor may be arranged to forward the sheets singly or in the form of a stream of partly overlapping or partly underlapping sheets.
  • Machines of the above kind may be employed to feed the sheets to a printing or other machine operating on individual sheets.
  • the suction gripper is carried on the end of a piston rod attached to thepiston and the arrangement is that the suction effects the lifting of the gripper against the reaction of a return spring or other restoring forces.
  • the suction gripper in a machine of the above kind is carried on a lever and the piston and cylinder arearranged to rock the lever to efiiect'the liftingof the gripper.
  • the machine according to the invention has the advantage that a single cylinder may be employed to elevate two or more grippers supported from the lever at spaced positions and the inventionincludes an arrangement in which two or more grippers are elevated in this way.
  • gripper may be carried on the end of an arm dependent from the lever aforesaid and means may be provided for imparting a swinging movement to the arm.
  • mechanical means are provided which are subject to the overriding control of the suction elevating means, for rocking the lever to lower the gripper at a controlled rate into engagement with a sheet, the arrangement permitting the suction operated piston and cylinder to lift the gripper independently of the lowering means.
  • the gripper may be lowered under accurate control on to the sheet and immediately the sheet is engaged the sealing of the gripper mouth automatically causes the suction means to elevate the sheet.
  • the area of the piston and the source of suction are such as to provide a rapid upward movement of the gripper (e. g., faster than it is lowered mechanically).
  • the mechanical means for lowering the gripper may comprise a cam with a follower on the lever which follower is free to be lifted off the cam when the suction lifting means become operative.
  • the machine may include means for moving the gripper in a direction over the top of the pile while gripping the lifted sheet thereby to forward or assist in forwarding the sheet to conveying means to remove the sheet from the pile and then to return the gripper and also a valve which, at the end of the forward movement, opens the gripper to atmosphere thereby releasing the sheet without opening the cylinder and at the end of the return movement opens the cylinder to atmosphere through the gripper.
  • the valve may be arranged and operate in the manner described in my co-pending U. S. application Ser. No. 88,861, filed April 24, 1949, now Patent No. 2,591,116, and my British application No. 11098/48, filed April 22, 1948, now Patent No. 674,843.
  • Figure 1 is a side view, partly in section of the machine
  • Figure 2 is a plan view of the machine
  • Figure 3 is a section on the line III-III in Figure 1, and
  • ' Figure 4 is a section on the line IV-IV in Fi ure 1.
  • the machine constituting this example is arranged to separate sheets of paper one at a time from the top of a pile 1 and to deliver the sheets on to a conveyor (not shown) where they form a continuous stream of partly overlapping sheets to be delivered to a rotary printing press.
  • the machine embodies a single lifting and forwarding mechanism with suction grippers spaced apart across the width of the pile adjacent the rear edge thereof (i. e., the rear edge considered in relation to the direction of the forwarding movement of the sheets to the conveyor).
  • the mechanism is supported from two bars 2, 3 extending transversely across the pile.
  • a supporting housing 4 which is clamped to the bars for sliding adjustment along the length thereof.
  • the dependent portion of the housing is forked and embraced within the arms of the fork there is a cylinder 5 having its mouth open and directed downwardly.
  • the cylinder which is of substantial diameter, contains a piston 6 which is urged downwardly by the weight of the mechanism connected thereto as about to be described.
  • a spring may, if desired, be provided to assist in urging the piston downwardly.
  • the piston has a rod 7 which extends upwardly through a guide and at its upper end the rod is provided with a cross-head 8 connected to the two parts, 9, 10 of the bifurcated arm of a bell-crank lever, the two parts embracing the guide and the piston rod.
  • the arm of the bell-crank lever extends approximately horizontally forwardly from the fulcrum 11 of the lever which is behind the guide to, and beyond, the piston rod 7.
  • the fulcrum is provided by a short shaft supported in the two arms of the fork of the housing 4.
  • the other arm 12 of the bell-crank extends downwardly and is provided at its lower end with a follower 13 engageable with a cam 14 which is carried for rotation on a shaft 15 passing through the arms of the bracket and across the pile parallel to the aforesaid supporting rods.
  • the piston 6 is a loose fit in the cylinder and is guided by the rod 7 in its guide.
  • the arrangement ensures a rapid and substantial lift of the gripper without the need of undue weight movable with the gripper over the pile. Further, by the use of a large diameter cylinder sufficient power is easily made available to provide a rapid stroke even when mechanical multiplication of the movement is employed, thereby allowing the use of a short cylinder with consequent saving in weight.
  • a rubber sealing ring 6A is provided on top of the piston and makes sealing engage- I ment with a seat 6B on the cylinder head.
  • the horizontal arm 9, 10 of the bell-crank lever carries at its front end a dependent parallelogram of links.
  • the parallelogram is pivoted at its top rear corner to the end of the arm.
  • the two downward links 16, 17 are of I double form (one part to each side of the top and bottom links) and at the lower end of the dependent links there is a carrier 18 for a pair of suction grippers 19, the carrier also constituting the bottom link.
  • a spring 23 extending across the corner between the top link and the stop 22 aforesaid serves to hold the stop against the abutment and to retain the system in a fixed condition during the raising and lowering of the bell-crank arm.
  • This arrangement in conjunction with the cam and push rod later described ensures that the links and grippers are in a defined backward position during the raising and lowering.
  • the two grippers 19 are respectively dependent from the two ends of a cross tube 26 held by the carrier 18 and extending cross-wise of the pile.
  • the cross tube 26 is attached to a slide 27 which may be adjusted in position on the carrier to move the tube 26 in the fore and aft direction of the pile.
  • the arrangement of the carrier and parallel links is that, as the links swing to move the grippers over the pile, the axes of the grippers remain at a substantially constant angle to the top of the pile.
  • the carrier embodies a shuttle valve 30 which is constructed as described in my U. S. Patent No. 2,591,116 and has two positions in which the suction grippers are open to the atmosphere and to a source of suction respectively.
  • the shuttle valve 30 co-operates with stops 31, 32 in the supporting bracket which are positioned respectively for engagement by the shuttle at th mit of the forward swing of the carrier to move the valve to open the grippers to atmosphere while maintaining suction in the cylinder, and for engagement by the shuttle valve 30 at the end of the backward movement to open the grippers to the suction, thereby to admit air to the cylinder and to allow the piston to fall under the control of the cam.
  • stops 31, 32 are spring loaded or made adjustable in position and the valve shuttle is arranged to have some latitude of movement.
  • a push rod 36 Pivoted to an arm 34 movable with the rear downward link 16 of the parallelogram about its pivotal support 35 to the bell-crank arm there is a push rod 36 which extends rearwardly and at its rear end is forked to embrace the cam shaft 15.
  • the rod 36 carries a follower 38 co-operating with a further cam 39 on the shaft to effect reciprocatory movements of the rod 36 and consequential swinging movements of the downward links and gripper carrier against the action of a return spring.
  • the effective length of the arm 34 is adjustable to vary the extent of swing of the gripper carrier. This feature forms the subject of a British application No. 4181/50.
  • the cylinder 5 is constantly open through a restricted passage 40, pipe 47 and tube 3 to a source of suction, and there is a communication from the cylinder through passageways 42 and the tubular piston rod 7 to the suction grippers 19 to constitute the suction supply to the grippers.
  • the flips 50 Close behind and between the grippers are two flips 50 at a fixed height (e. g., half an inch) above the pile at the rear edge, but preferably adjustable to the extent to which they extend over the pile.
  • the flips 50 are of springy steel strip and are located between the two grippers and are supported from the bracket 4. The flips prevent the sheets being fiuffed up to the foot (later described) when the foot is fully raised. Two further flips are positioned over the rear corners of the pile respectively to control the sheets immediately beneath the sheet being separated.
  • a second pair of parallel links 60, 61 which are each pivoted to the support bracket 4 at a position behind and above the rear edge of the pile, and which extend forwardly and approximately horizontally one above the other from their pivotal attachments.
  • the links and 61 carry a pressure foot 62 and a pair of dependent air-blast nozzles 63 located one on either side of the foot and behind the top of the pile.
  • the foot has an upward extension 62A which connects to two links.
  • the parallel links ensure that the foot and nozzles may be raised and lowered without change in their angular relations to the pile.
  • a spring 64 urges the foot downward.
  • the operation of the machine to separate a sheet from the top of the pile is as follows. Initially the foot 62 rests on the top of the pile adjacent to the rear edge thereof.
  • the fiufiing air-blast which is adjustable in strength to suit different types of stock, is turned on to the nozzles 63 and at the same time the foot 62 and air nozzles are raised by means of the associated cam 67.
  • the air blasts fluff the uppermost sheets of the pile so that their rear edges tend to rise up to or towards the flips 50 as indicated .in chain lines in Figure l.
  • the foot 62 comes to rest after it has been raised a short distance above the flips (i. e., in the chain line position shown in Figure 1).
  • the cylinder Prior to this engagement the cylinder has been open to atmospheric pressure through the grippers and the weight of the parts assisted by a spring has lowered the piston in the cylinder under the control of the cam.
  • the gripper mouths are sealed by engagement with the sheet, the suction builds up in the cylinder and causes the piston rapidly to rise thereby immediately to lift the grippers even though the operation of the cam may still tend to continue their down movement.
  • the grippers 19 engage the sheet a short distance from the rear edge (e. g. the part of the grippers engaging the sheet nearest to the edge may be about one inch from the edge) and the flips 50 extend over the edge a somewhat smaller distance (e. g. about A to of an inch).
  • the foot 62 is lowered on to the top of the pile and engages the pile under pressure derived from the spring to clamp the remaining sheets against movement.
  • an air blast is emitted from the foot and is directed between the partially lifted sheet and the remainder of the pile to complete the separation of the sheet.
  • the grippers 19 are then moved forwardly, carrying the top sheet, by a swinging movement of the parallel links 16, 17 derived from the cam 39 through the push rod 36.
  • the shuttle valve 30 is operated to open the grippers to atmospheric pressure and to close the connection between the grippers and the cylinder 5 thereby to retain the reduced pressure in the cylinder.
  • the sheet is released by the grippers 19 to be taken by nipper rolls or other mechanism associated with the conveyor and the grippers are retained in their raised position.
  • the grippers 19 are then swung rearwardly and at the end of this movement the shuttle valve 30 is operated to open the grippers to the cylinder thereby applying suction to the grippers and substantially destroying the reduced pressure in the cylinder.
  • the piston is now free to fall, but the falling movement of the piston and the grippers is controlled by the cam 14 operating on the bell-crank lever so that the grippers 19 are lowered comparatively slowly into engagement with the next sheet which has in the meantime been fluffed-up ready for separation as described above.
  • the timing of the operations of the two air blasts is approximately as follows:
  • the air blast against the rear edge of the pile to fiufi the sheets operates during the rearward swing of the grippers 19 for a total period corresponding to 60 to 70 of the revolution of the press cylinder and ceases as soon as the top sheet has been gripped.
  • the remainder of the sheets then fall back on to the pile and are clamped by the foot 62.
  • the separating blast from the foot 62 operates from the time that the foot has been lowered on to the sheets, or a little before, for about 60 before the forwarding starts and until the sheet is released by the grippers 19.
  • the machine described in the above example is intended for use with sheets of comparatively narrow width.
  • the tube 26 may be lengthened (e. g. from about inches up to two or three feet) and there may be two pairs of grippers, one pair at each end of the tube with a separation of about 2 to 2 inches between the grippers of each pair. With this arrangement there will be a flip between each pair of grippers in addition to the two flips one on each side of the foot as described above. The additional flips may be supported from the bars 2 and 3.
  • Alterna-' tively for use in separating large sheets there may be two devices as described above spaced apart across the rear of the pile. Again the fiuifing nozzles may be arranged to direct air obliquely on to the rear of the pile to increase the spread of the air and/or the nozzles may be further distributed over the rear of the pile. Further, it is within the invention so to modify the above example that the two parts of the double parallel links carrying the grippers are spaced apart outside the side edges of the sheets respectively and are carried for swinging movement near the side frames of the machine.
  • the grippers may be carried on a cross-link extending over the top of the pile from one link part on one side frame to the other link part in the other side frame, the suction cylinders remaining at the centre of the width of the pile and being connected by a cross-member to the links.
  • the above example relates to a machine and conveyor arranged to produce, on the conveyor, a continuous stream of sheets.
  • the arrangement may, however, be varied (e. g. by increasing the speed of the conveyor) so that the sheets are conveyed individually.
  • a machine for separating sheets from the top of a pile comprising a frame, a suction gripper for gripping each uppermost sheet in turn, and means for elevating the gripper while gripping a sheet; said means comprising a lever pivoted to the frame, means attaching the gripper to the lever at one position spaced apart from the pivot, and a suction operated contracting device connecting the lever to the frame at another position on the lever spaced from the pivot to rock the lever to lift the gripper on contraction of the device by building up of suction therein, the said device being arranged for continuous connection to a source of suction and having a connection to atmosphere through the gripper whereby sealing of the gripper by a sheet causes suction to be applied to the device to contract the device, and means for releasing the suction in the device.
  • a machine as claimed in claim 6, in which the mechanical means for controlling the rate of descent of the gripper comprise a cam with a follower on the lever, which follower is free to be lifted off the cam when the contracting device becomes operative to lift the gripper.
  • a machine for separating sheets in turn from the top of a pile comprising, a frame, a lever pivotally supported by said frame for movement about a substantially horizontal axis, a suction gripper for gripping each uppermost sheet in turn, pivoted link means attaching the gripper to the lever at one position spaced therealong from the pivot, the lever being urged to rotate about its pivot in a direction to lower the gripper, abutment means abutting against the lever to limit rotation of the lever about its pivot in said direction, means for moving said abutment means to permit controlled movement of the lever about its pivot in said direction, thereby to lower the gripper towards the uppermost sheet of the pile, a suctionoperable lifting device connecting the lever to the frame at a second position spaced along the lever from the pivot, whereby on operation of said device the lever is rotated about its pivot in the opposite direction away from the abutment means thereby to raise the gripper, the device being arranged for continuous connection to a source of suction and having a connection to atmosphere through the grip

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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US225251A 1950-05-10 1951-05-08 Separation of sheets of paper or the like from the top of a pile Expired - Lifetime US2722416A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2982188A (en) * 1957-04-26 1961-05-02 New Jersey Machine Corp Box making machines
US3278078A (en) * 1964-10-02 1966-10-11 Ertma S A Device for dispensing documents singly
US3559985A (en) * 1968-08-21 1971-02-02 Adamovske Strojirny Np Sheet-feeding mechanism for printing presses
US3675917A (en) * 1969-07-26 1972-07-11 Heidelberger Druckmasch Ag Suction head in sheet-feed systems
US3938800A (en) * 1972-04-26 1976-02-17 Heidelberger Druckmaschinen Aktiengesellschaft Suction head for sheet feeding apparatus
US4248417A (en) * 1975-03-12 1981-02-03 Ricoh Company, Ltd. Sheet feed mechanism comprising one-rotation clutch and suction foot assembly
US4327906A (en) * 1978-05-02 1982-05-04 Stahl Gmbh & Co. Sheet separating apparatus
US4569512A (en) * 1982-10-01 1986-02-11 Hotchkiss-Brandt Sogeme H.B.S. Device for destacking letters associated with a storage magazine and sorting machine equipped with such a device
US4596385A (en) * 1984-09-27 1986-06-24 Xerox Corporation Top vacuum corrugation feeder with moveable air blocking vane
US4786043A (en) * 1985-10-10 1988-11-22 Zvs - Adamovsky Strojirny Koncernovy Podnik Adamov Device for feeding single paper sheets from a pile
WO1991013822A1 (de) * 1990-03-03 1991-09-19 Georg Binnen Schleppdüseneinrichtung für schnellaufende bogenanleger
EP0803457A2 (de) * 1996-04-24 1997-10-29 MAN Roland Druckmaschinen AG Vorrichtung zum Trennen und Anheben des obersten Bogens von einem Bogenstapel

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1121629B (de) * 1958-01-28 1962-01-11 Addressograph Multigraph Ltd Bogenzufuehrungsvorrichtung fuer bogenverarbeitende Maschinen
DE1100043B (de) * 1958-08-15 1961-02-23 Leipziger Buchbindereimaschine Greifer an Druck- und Buchbinderei-Maschinen zum Erfassen und Festhalten von Bogen aus Papier, Pappe oder aehnlichem Material
GB1222546A (en) * 1967-05-12 1971-02-17 Adamovske Strojirny Np Improvements in or relating to apparatus for feeding sheets in printing machines
JPS5024517B1 (de) * 1971-06-23 1975-08-15
DE2220353C2 (de) * 1972-04-26 1981-06-11 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Saugkopf an Bogenanlegern

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2085612A (en) * 1935-10-22 1937-06-29 Spiess Georg Sheet separating device
US2215458A (en) * 1936-05-28 1940-09-24 Backhouse Headley Townsend Sheet separating and lifting means
US2341521A (en) * 1941-03-04 1944-02-15 Dexter Folder Co Sheet feeding apparatus
US2591116A (en) * 1948-04-22 1952-04-01 Backhouse Headley Townsend Sheet separating and forwarding machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2085612A (en) * 1935-10-22 1937-06-29 Spiess Georg Sheet separating device
US2215458A (en) * 1936-05-28 1940-09-24 Backhouse Headley Townsend Sheet separating and lifting means
US2341521A (en) * 1941-03-04 1944-02-15 Dexter Folder Co Sheet feeding apparatus
US2591116A (en) * 1948-04-22 1952-04-01 Backhouse Headley Townsend Sheet separating and forwarding machine

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2982188A (en) * 1957-04-26 1961-05-02 New Jersey Machine Corp Box making machines
US3278078A (en) * 1964-10-02 1966-10-11 Ertma S A Device for dispensing documents singly
US3559985A (en) * 1968-08-21 1971-02-02 Adamovske Strojirny Np Sheet-feeding mechanism for printing presses
US3675917A (en) * 1969-07-26 1972-07-11 Heidelberger Druckmasch Ag Suction head in sheet-feed systems
US3938800A (en) * 1972-04-26 1976-02-17 Heidelberger Druckmaschinen Aktiengesellschaft Suction head for sheet feeding apparatus
US4248417A (en) * 1975-03-12 1981-02-03 Ricoh Company, Ltd. Sheet feed mechanism comprising one-rotation clutch and suction foot assembly
US4327906A (en) * 1978-05-02 1982-05-04 Stahl Gmbh & Co. Sheet separating apparatus
US4569512A (en) * 1982-10-01 1986-02-11 Hotchkiss-Brandt Sogeme H.B.S. Device for destacking letters associated with a storage magazine and sorting machine equipped with such a device
US4596385A (en) * 1984-09-27 1986-06-24 Xerox Corporation Top vacuum corrugation feeder with moveable air blocking vane
US4786043A (en) * 1985-10-10 1988-11-22 Zvs - Adamovsky Strojirny Koncernovy Podnik Adamov Device for feeding single paper sheets from a pile
WO1991013822A1 (de) * 1990-03-03 1991-09-19 Georg Binnen Schleppdüseneinrichtung für schnellaufende bogenanleger
US5308055A (en) * 1990-03-03 1994-05-03 Koenig & Bauer Aktiengesellschaft Trailing nozzle device for fast paper feeders
EP0803457A2 (de) * 1996-04-24 1997-10-29 MAN Roland Druckmaschinen AG Vorrichtung zum Trennen und Anheben des obersten Bogens von einem Bogenstapel
EP0803457A3 (de) * 1996-04-24 1998-04-01 MAN Roland Druckmaschinen AG Vorrichtung zum Trennen und Anheben des obersten Bogens von einem Bogenstapel

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DE928950C (de) 1955-06-16

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