US3689062A - Sheet feed device for printing machines and the like - Google Patents

Sheet feed device for printing machines and the like Download PDF

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Publication number
US3689062A
US3689062A US86424A US3689062DA US3689062A US 3689062 A US3689062 A US 3689062A US 86424 A US86424 A US 86424A US 3689062D A US3689062D A US 3689062DA US 3689062 A US3689062 A US 3689062A
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Prior art keywords
tray
lifting member
sheet feed
arm
movement
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Expired - Lifetime
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US86424A
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English (en)
Inventor
Minoru Suzuki
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Ricoh Co Ltd
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Ricoh Co Ltd
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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
    • B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
    • B65H3/54—Pressing or holding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H1/00—Supports or magazines for piles from which articles are to be separated
    • B65H1/04—Supports or magazines for piles from which articles are to be separated adapted to support articles substantially horizontally, e.g. for separation from top of pile

Definitions

  • ABSTRACT [2.1] A 1 86 424 A pair of sheet hold-down members, provided with respective sheet-engaging pawls, are moved upward simultaneously upon actuation of a lifting member au- [30] Foreign Application Priority Data tomatically held in its operative position by holding means.
  • the holding means are released, to permit :33 :2 fig: movement of the lifn'ng member to an inoperative l position, responsive to movement of a sheet feed l W roller from a lifted inoperative position downwardly (g1 into engagement with a stack of sheets If the Sheet [58] Fieid s 36 39 feed device has a retractable sheet feed tray, the holding means for the lifting member is released responsive to movement of the tray to its retracted position, [56] References Cited for movement of the lifting member to its inoperative UNITED STATES PATENTS Position- 2,893,729 7/1959 Perzentka ..271/21 10 Claims, 6Drawing Figures Pmmd Sept. 5, 1912 I 3,689,062
  • Sheets-Sheet 2 INVENTOR MmoRu suzum K 27 waf le/Em ATTORNEYS I Patented Sept. 5, 1972 3 Sheets-Sheet 3 INVENTOR.
  • Sheet feed devices for printing machines, copying machines, and the like, are provided with sheet holddown members having pawls for engaging and holding down the front corners of master plates, copy sheets, photosensitive sheets and the like, which are hereinafter referred to as sheets, and which are piled in a stack on a sheet feed tray, in order that the sheets may be fed positively and smoothly.
  • a sheet feed device embodying the invention permits readily supplying the sheet feed tray with a fresh stack of sheets without any trouble. It is possible, with the device of the invention, to bring the sheet hold-down members, having the pawls, into engagement with the sheets simultaneously with movement of the sheet feed roller into pressing engagement with the stack of sheets on the tray.
  • the lifting member is brought to its lower, or inoperative, position whenever the sheet feed tray is moved to its retracted position. With this arrangement, the difficulty of being unable to move the sheet hold-down members upwardly when the sheet feed tray is brought to its operative position in the next cycle of operation can be eliminated.
  • An object of the invention is to provide an improved sheet feed device for printing machines, copying machines and the like.
  • Another object of the invention is to provide such a sheet feed device in which the sheet hold-down members are moved upwardly simultaneously by a lifting device which is then releasably held in its operative position.
  • a further object of the invention is to provide such a sheet feed device in which the lifting member is automatically released from its operative position responwhen the tray is to be supplied with another stack of sheets.
  • the sheet hold-down members are mounted separately on opposite sides of the sheet feed tray.
  • the operator is required to use both hands to move the sheet hold-down members to their retracted positions while he is required, on the other hand, to move the sheet feed roller to its upper position, when a fresh supply of sheets is placed on the tray.
  • the operation of supplying a fresh stack of sheets to the tray therefore has been troublesome and time consuming.
  • This invention relates to sheet feed devices, for printing machines, copying machines, and the like and, more particularly, to an improved and simplified means greatly facilitating placing a fresh stack of sheets on a sheet feed tray by retaining sheet old-down members and a sheet feed roller in an upper retracted position in a simple and positive manner.
  • the objective of the invention is to provide a sheet feed device in which a pair of sheet hold-down members, having respective pawls, can be moved upwardly simultaneously and held in their upper retracted positions, and can be automatically moved downwardly to their lower operative positions responsive to downward movement of a sheet feed roller, or when a sheet feed tray is moved to its upper or retracted position, when a retractable sheet feed tray is provided on the machine.
  • a pair of these sheet hold-down members are moved simultaneously upwardly by a lifting member which is automatically retained in its upper or operative position by holding means.
  • This holding means is automatically released, to permit the lifting member to move to its lower or inoperative position, responsive to movement of a sheet feed roller to its operative position in engagement with a stack of sheets.
  • the lifting member is sive to movement of a sheet feed roller downwardly to engage a stack of sheets on a sheet feed tray.
  • Another object of the invention is to provide such a sheet feed device in which the lifting member is automatically released, for movement to its inoperative position, responsive to movement of a retractable sheet feed tray to its retracted position.
  • FIG. 1 is a side elevation view of a sheet feed device, for printing means and the like, constituting one embodiment of the present invention
  • FIG. 2 is a partial plan view illustrating the left half of a sheet feed tray, as viewed in the sheet feeding direction;
  • FIGS. 3, 4 and 5 are side elevation views illustrating the manner of operation of the sheet feed device shown in FIG. 1;
  • FIG. 6 is a perspective view of the sheet hold-down members and the lifting member, showing the relative positions as the sheet hold-down members are moved upwardly by the lifting member.
  • a sheet feed section of a printing machine or the like has a sheet feed tray 1 provided, on opposite edges of its front end, with a pair of upright members or ears la apertured to receive a mounting shaft 2 connected to a pair of side walls 3 of the sheet feed section, so that tray 1 can pivot about the axis of shaft 2.
  • a shaft 4 extends through the lower portions of the upright members la, and side walls 3 have arcuate slots 3a each being a circular are centered on shaft 2.
  • the opposite ends of shaft 4 are slidably received in slots 3a, and collars 5 are firmly secured to each end of shaft 4.
  • Sheet feed tray 1 is so constructed that it can be pivoted about the axis of shaft 2 between the operative, or sheet feeding, position shown in FIG. 1 and an inoperative, or retracted, position shown in FIG. 4, by manually moving tray 1 between these two positions.
  • Slots 3a have an arcuate length sufficient to permit tray 1 to move between the two predetermined positions thereof.
  • a pair of side plates 6 are provided on the upper surface of tray 1, and include mounting members 6a having apertured bent depending portions extending through transversely directed slots lb (FIG. 2), formed in the central portion of the bottom of tray 1, and fitted loosely over a guide rod 7 firmly secured at its opposite ends to feed tray 1.
  • a pair of sheet hold-down members 8, having respective pawls 8a (FIG. 2) at their forward ends, are pivotally mounted by pivots or pins 9 on opposite sides of side plates 6. The forward end of each hold-down member 8 is bent downwardly, as shown in FIG. 1, to form a foot 8b.
  • An internally threaded member 10 is firmly secured to the underside of the horizontal portion of each mounting member 6a to threadedly receive a headed screw 11 extending downwardly and loosely through an opening formed in each sheet hold-down member 8.
  • Sheets S are placed on feed tray 1 by being posi tioned on the horizontal portion 6b of side plates 6. Each time a fresh supply of sheets S is placed on tray 1, side plates 6 are adjusted laterally relative to each other along guide rod 7 within the limits permitted by slots lb, so as to effect adjustment of the position of sheets S which are piled in a stack.
  • a head 11a of each screw 11 is turned so as to thread screw 11 downwardly until its forward end abuts against guide rod 7.
  • side plates 6 are firmly secured and sheets S are held by side plates 6 in the predetermined position.
  • a rubber plate 12 is provided toward the forward end of the horizontal portion 6b of each side plate 6, for preventing slipping of sheets S on tray 1. Furthermore, an upright wall 60 is provided on such forward end of each side wall 6 and is disposed laterally outwardly of side plates 6, as best seen in FIG. 2. Pawls 8a are adapted to move upwardly and downwardly along upright walls 60.
  • the disclosed arrangement, in which upright walls 60 are disposed outwardly of side plates 6, makes it possible to feed the sheets smoothly by bringing inclined edges 8a,, as shown in FIG. 2, of pawls 80 into engagement with opposite side edges of sheets S when these are held down at the two front corners by pawls 8a.
  • Upper and lower guide plates 13 and 14, respectively, are disposed forwardly of tray 1 in the sheet feed section, and delivery rollers 15 and 16 press against each other and are disposed substantially in the central portion of the sheet feed section.
  • a support shaft 17 is connected to side walls 3 in a position above and to the right of roller 15, as viewed in FIG. 1.
  • Shaft 17 loosely mounts support arms 19 for a sheet feed roller 18 mounted on a support shaft 18a supported in arms 19, and-connected by suitable means to a drive mechanism (not shown) so that feed roller 18 may be rotated in the direction of the arrow a of FIG. 1 when sheets S are fed.
  • Support arms 19 are moved to the dash and dot line positions 19A, shown in FIG.
  • Sheets S on tray 1 are gradually reducedin number as they are fed singly to the section in which they are treated and, as the sheets decrease in number, pawls 8a and feed roller 18 move downwardly until they are brought into engagement with the bottom wall of feed try 1 when there are no sheets thereon.
  • the position of foot 8b of one member 8, when pawl 8a engages the bottom wall of tray 1, is shown in dash and dot line at 8bA in FIG. 3.
  • a substantially u-shape lifting member 27 has its legs 27a secured to shaft 23, as by welding, brazing, or the like, and its bight 27b is disposed beneath feet 8b of hold-down members 8. The length of bight 27b is sufficient that it is disposed beneath feet 8b when the lateral distance between these feet is at its maximum as side plates 6 are separated laterally the maximum possible distance.
  • Lifting member 27 normally is disposed in its lower or inoperative position shown in FIG. 1, but can be moved to its upper or operative position by operating arm 26 from the exterior of the machine, to turn this arm in the direction of the arrows b of FIG. 1 so as to angularly displace member 27 about the axis of shaft 23. If arm 26 is turned in the direction of arrow b, lifting member 27, then disposed in its lower position 27A shown in dash and dot lines in FIG. 3, will move to the solid line position shown in FIG 3. Thereby, feet 8b of hold-down members 8 are moved from the dash and dot line positions 8bA of FIG. 3 to the solid line positions of FIG. 3, while pawls 8a of members 8 disengage the bottom wall of sheet feed tray 1.
  • a locking lever 28 is loosely mounted at that end of shaft 17 nearer to the plane of FIG. 1, this being the shaft supporting support arms 19 for sheet feed roller 18.
  • Engaging arm 25 has a bent engaging portion 25a at its upper end which is adapted to come into engagement with a locking notch 28a at the end of one arm of lever 28, when lifting member 27 is moved upwardly to its upper or operative position shown in FIG. 3. Thereby, lifting member 27 can be held in its upper operative position, so that pawls 8a are moved upwardly and remain clear of tray 1, as shown in FIG. 3, to permit loading another stack of sheets on tray 1.
  • a pin 29 on the support arm 19, for feed roller 18, disposed nearer to the plane of FIG. 1, projects outwardly through an arcuate slot 3b formed in the adjacent side wall 3, this arcuate slot being centered on the axis of shaft 17.
  • the other arm 28b of lever 28 is disposed in the path of movement of pin 29.
  • Pin 29 does not interfere with the operation of locking lever 28 when sheets S are placed on tray 1, because feed roller 18 is disposed in its upper position shown in FIG. 3, as mentioned.
  • pin 29 moves from its upper position shown in FIG. 3, and which is the dot and dash line position 29A shown in FIG. 1, to its solid line position, as shown in FIG. 1, along slot 3b.
  • pin 29 engages arm 28b of lever 28 locking engaging arm 25, and moves this arm clockwise about the axis of shaft 17, thereby releasing locking lever 28 from locking engagement with engaging arm 25.
  • lifting member 27 moves downwardly by its own weight to its lower position shown in FIG. 1, and which is the dot and dash line position 27A of FIG. 3. Accordingly, pawls 8a of holddown members 8 move downwardly, by their own weight, into pressing engagement with the sheets S stacked on tray 1.
  • Base portions 270 of the arms of the U-shaped lifting member 27 are bent upwardly, as best seen in FIG. 6, so that the range of pivotal movement of member 27 can be restricted by inhibiting movement of base portions 27c by engagement with suitable stops.
  • Locking lever 28 is pushed downwardly by pin 29 at all times while the sheet feed roller 18 is in its operative or sheet feeding position. However, if roller. 18 is moved upwardly to its inoperative position, lever 28 is released from engagement with pin 29 and pivots counterclockwise about the axis of shaft 17 by its own weight, so that locking member 28 can lock engaging arm 25 of lifting member 27.
  • a locking release lever 30 is pivotally mounted at that end of shaft 2, mounting tray 1, which is disposed nearer to the plane of FIG. 1, and a frictional force of a low order is imparted to lever 30 by a leaf spring 31, as best seen in FIG. 2.
  • Lever 30 has three arms 30a, 30b and 30c. Arms 30b and 300 are disposed on opposite sides of shaft 4, and spaced from each other a distance slightly smaller than the range of movement of shaft 4 along slots 3a. If tray 1 is brought to its sheet feeding position shown in FIG. 1, shaft 4 pivots clockwise about the axis of shaft 2, so that arm 30b is pushed and moved by collar 5 and lever 30 is pivoted clockwise about shaft 2.
  • the bent end portion of arm 30a which is disposed in a position corresponding to the position of arm 28b of locking lever 28, moves away from arm 28b when lever 30 pivots clockwise.
  • FIG. 1 shows the sheet feed device embodying the invention in this state.
  • FIG. 3 shows the sheet feed device embodying the invention in this state.
  • locking release lever 30 for moving lifting member 27 downwardly from its upper operative position to its lower inoperative position upon movement of feed tray 1 to its inoperative retracted position is effective to prevent failure of lifting member 27 to move hold-down members 8 to their upper positions. If lifting member 27 remained in its upper position, shown in dash and dot lines at 27B in FIG. 5, after tray 1 has been moved to its retracted position, feet 8b of member 8 would be disposed below lifting portion 278 of member 27 when tray 1 is moved to its operative or sheet feeding position. This would make it impossible to move members 8 to their upper positions even if operation arm 26 were operated to move lifting member 27 to its upper position.
  • FIG. 5 shows tray 1 in a position intermediate its retracted and sheet feeding positions. If lifting member 27 were in its upper operative position 27B when tray 1 is in this intermediate position, feet 8b of hold-down members 8 would move to their dash and dot line positions 8bA as tray 1 is moved to its operative sheet feeding position. Thus, lifting member 27 would move into its dash and dot line position 27C in which member 27 rides on feet 8b, if member 27 were moved downwardly. When this happens, lifting member 27 would move only idly and cannot lift hold-down members 8 even if operation arm 26 is operated by hand.
  • the dash and dot line positions 25A, 26A and 28A in FIG. 5 are the positions in which engaging arm 25, operation arm 26 and locking lever 28 are respectively disposed when lifting member 27 is in its upper or operative position.
  • tray 1 is attached to the frame of the machine, the manner in which side plates 6 are mounted on tray 1 and the manner in which sheet feed roller 18 is constructed and supported, as well as the means for holding lifting member 27 in its upper operative position and moving it downwardly to its lower inoperative position in conjunction with the downward movement of feed roller 18 or feed tray 1 are not limited to the specific examples shown and described above, but that other suitable means may be used without departing from the spirit and scope of the invention.
  • a sheet feed device for printing and the like sheet-utilizing machines having a frame, said device comprising, in combination, a sheet feed tray mounted on said frame; a pair of sheet hold-down members pivotally mounted on said tray and having respective pawls for holding down front corners of sheets stacked on said tray; a lifting member mounted on said frame in a position to engage said hold-down members; externally accessible operating means operable to move said lifting member from an inoperative position, out of engagement with said hold-down members, into engagement with said hold-down members and to an operative position lifting said hold-down members to an upper inoperative position, for stacking a fresh supply of sheets on said tray; holding means on said frame operable to retain said lifting member in its operative position; a sheet feed roller manually movable, independently of said operating means, between an operative position, engaging a sheet stack on said tray, and a retracted position permitting reloading of said tray; and first release means engageable and operable by said roller, upon movement thereof toward its operative position, to release said holding means
  • a sheet feed device as claimed in claim 1, in which said sheet feed tray has side flanges; said holddown members being pivotally supported by said side flanges.
  • a sheet feed device as claimed in claim 1, in
  • said hold-down members have depending feet each adjacent a respective pawl; a shaft rotatably mounted on said frame; said lifting member comprising a U-shape member including a pair of legs secured to said shaft for rotation therewith and interconnected by a bight disposed beneath said feet and engageable with said feet upon movement of said lifting member toward its operative position.
  • a sheet feed device as claimed in claim 3, in which said externally accessible operating means comprises an arm secured to an outwardly projecting end of said shaft.
  • a sheet feed device in which said sheet feed roller is rotatably supported by a pair of roller support arms pivotal on a second shaft supported in said frame; said lifting member including an engaging arm secured to rotate with said first-mentioned shaft and having a bent free end; said holding means comprising a holding lever pivotal on said second shaft and having an arm formed with a notch at its free end engageable with said bent end of said engaging arm upon movement of said lifting member to its operative position to retain said lifting member in its operative position; and means on one of said support arms engageable with a second arm of said holding lever upon movement of said sheet feed roller toward its operative position, to rock said holding lever to release said bent end of said engaging arm for return of said lifting member to its inoperative position.
  • a sheet feed device as claimed in claim 5, in which said means and said one support arm engageable with said holding lever comprises a pin extending through an arcuate slot in said frame and which is centered on the axis of said second shaft; said holding lever having a second arm engageable by said pin.
  • a sheet feed device for printing and the like sheet-utilizing machines having a frame, said device comprising, in combination, a sheet feed tray mounted on said frame; a pair of sheet hold-down members pivotally mounted on said tray and having respective pawls for holding down front corners of sheets stacked on said tray; a lifting member mounted on said frame in a position to engage said hold-down members; externally accessible operating means operable to move said lifting member from an inoperative position, out of engagement with said hold-down members, into engagement with said hold-down members and to an operative position lifting said hold-down members to an upper inoperative position, for stacking a fresh supply of sheets on said tray; holding means on said frame operable to retain said lifting member in its operative position; a sheet feed roller movable between an operative position, engaging a sheet stack on said tray, and a retracted position permitting reloading of said tray; and first release means operable responsive to movement of said roller toward its operative position, to release said holding means for return of said lifting member to its inoperative position and lowering
  • a sheet feed device as claimed in claim 7, in which said sheet hold-down members are formed with depending feet each adjacent a respective pawl; a first shaft rotatably mounted on said frame; said lifting member'comprising a U-shape member having a pair of legs secured to said first shaft to rotate therewith and interconnected by a bight positioned beneath said feet and engageable therewith upon movement of said lifting member to its operative position; said externally accessible operating means comprising an operating arm secured to a projecting end of said first shaft exteriorly of said frame; said sheet feed roller being rotatably supported by a pair of roller support arms pivotal on a second shaft mounted in said frame; said lifting member further including an engaging arm secured at one end to said first shaft and having a bent free end; said holding means comprising a holding lever pivotal on said second shaft and having a first arm formed with a notch in its free end engageable with the bent end of said engaging arm upon movement of said lifting member to its operative position to lock said lifting member in its operative position; said first
  • a sheet feed device including a third shaft pivotally mounting said tray for movement between its inoperative retracted position and its operative sheet feeding position; a rod extending transversely of said tray and extending through a second arcuate slot in said frame and concentric with the axis of said third shaft; said second release means comprising a three-arm lever pivotal on said third shaft and having first and second arms extending across said second arcuate slot and spaced apart an angular distance less than the range of angular movement of said rod for engagement by said rod as said rod reaches its limit of movement in either direction during movement of said tray between its inoperative retracted position and its operative sheet feeding position; the third arm of said three-arm lever, upon movement of said tray to its inoperative retracted position being swung, by the oscillation imparted to said three-arm lever by said rod, to engage said third arm with said second arm of said holding lever to release said notch from said bent end of said engaging arm.
  • a sheet feed device as claimed in claim 9, including means restraining inadvertent pivotal movement of said three-arm lever.

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US86424A 1969-11-15 1970-11-03 Sheet feed device for printing machines and the like Expired - Lifetime US3689062A (en)

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JP10914069 1969-11-15
JP9201269 1969-11-15

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3957366A (en) * 1974-09-05 1976-05-18 Xerox Corporation Sheet feeding apparatus
US4602775A (en) * 1985-04-08 1986-07-29 Eastman Kodak Company Modular cover inserter unit
US4830353A (en) * 1986-05-20 1989-05-16 Oce-Nederland B.V. Device for holding a stack of sheets and discharging them from the top thereof
US20050062217A1 (en) * 2003-08-12 2005-03-24 Brother Kogyo Kabushiki Kaisha Recording medium feed apparatus
US20060017217A1 (en) * 2004-07-22 2006-01-26 Funai Electric Co., Ltd. Paper tray supporting structure
US20070201921A1 (en) * 2006-02-27 2007-08-30 Brother Kogyo Kabushiki Kaisha Image recording apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2679801A (en) * 1950-08-04 1954-06-01 Frank R Ford Ltd Driving mechanism for sheet-feeding devices in duplicating and like machines
US2893729A (en) * 1957-04-29 1959-07-07 Dick Co Ab Sheet separating mechanism for duplicators
US3369804A (en) * 1965-11-26 1968-02-20 Addressograph Multigraph Sheet feeding apparatus
US3588097A (en) * 1969-02-20 1971-06-28 Scm Corp Sheet feeding apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2679801A (en) * 1950-08-04 1954-06-01 Frank R Ford Ltd Driving mechanism for sheet-feeding devices in duplicating and like machines
US2893729A (en) * 1957-04-29 1959-07-07 Dick Co Ab Sheet separating mechanism for duplicators
US3369804A (en) * 1965-11-26 1968-02-20 Addressograph Multigraph Sheet feeding apparatus
US3588097A (en) * 1969-02-20 1971-06-28 Scm Corp Sheet feeding apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3957366A (en) * 1974-09-05 1976-05-18 Xerox Corporation Sheet feeding apparatus
US4602775A (en) * 1985-04-08 1986-07-29 Eastman Kodak Company Modular cover inserter unit
US4830353A (en) * 1986-05-20 1989-05-16 Oce-Nederland B.V. Device for holding a stack of sheets and discharging them from the top thereof
US20050062217A1 (en) * 2003-08-12 2005-03-24 Brother Kogyo Kabushiki Kaisha Recording medium feed apparatus
US7036813B2 (en) * 2003-08-12 2006-05-02 Brother Kogyo Kabushiki Kaisha Recording medium feed apparatus
US20060017217A1 (en) * 2004-07-22 2006-01-26 Funai Electric Co., Ltd. Paper tray supporting structure
US7520502B2 (en) * 2004-07-22 2009-04-21 Funai Electric Co., Ltd. Paper tray supporting structure
US20070201921A1 (en) * 2006-02-27 2007-08-30 Brother Kogyo Kabushiki Kaisha Image recording apparatus
US7883285B2 (en) * 2006-02-27 2011-02-08 Brother Kogyo Kabushiki Kaisha Image recording apparatus

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GB1326902A (en) 1973-08-15
DE2056024B2 (de) 1972-11-23
DK131556C (da) 1976-01-05
DE2056024A1 (de) 1971-07-29
DK131556B (da) 1975-08-04

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