US3724839A - Copy sheet feed tray raising and lowering device for duplicator or the like - Google Patents

Copy sheet feed tray raising and lowering device for duplicator or the like Download PDF

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Publication number
US3724839A
US3724839A US00209642A US3724839DA US3724839A US 3724839 A US3724839 A US 3724839A US 00209642 A US00209642 A US 00209642A US 3724839D A US3724839D A US 3724839DA US 3724839 A US3724839 A US 3724839A
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United States
Prior art keywords
operation lever
copy sheet
sheet feed
feed tray
lever
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Expired - Lifetime
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US00209642A
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English (en)
Inventor
M Suzuki
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Ricoh Co Ltd
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Ricoh Co Ltd
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Publication date
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Publication of US3724839A publication Critical patent/US3724839A/en
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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
    • B65H1/00—Supports or magazines for piles from which articles are to be separated
    • B65H1/08—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device
    • B65H1/14—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device comprising positively-acting mechanical 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
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/21—Industrial-size printers, e.g. rotary printing press

Definitions

  • ABSTRACT A copy sheet feed tray operating device comprising an operation lever, pivotally supported by a side plate of the duplicating machine in which it is incorporated and movable from a first position to second and third positions, and suitable operating mechanisms whereby pivoting of the operation lever from the'first position to the second position moves the copy sheet feed tray downwardly and the copy sheet feed roller upwardly, thereby permitting the placing of a predetermined number of copy sheets on the tray. Shifting of the operation lever from the second position to the third position moves the copy sheet feed tray upwardly so as to bring the top of a new stack of copy sheets on the tray into pressing engagement with the copy sheet feed roller. The force with which the copy sheet feed roller presses against the stack of copy sheets on the tray is automatically adjusted to an optimum level so that it is possible to feed each copy sheet under optimum conditions without requiring further adjustments. When the operation lever is released, it automatically returns to the first position.
  • the copy sheet feed tray is gradually moved upwardly by a known copy sheet feed tray elevating device coupled to the printing machine as the number of copy sheets on the tray gradually decreases with the progress of printing operation.
  • the command to move upwardly is generally given when a detection lever operatively associated with the copy sheet feed roller moves downwardly.
  • This invention embodies a copy sheet feed tray raising and lowering device for duplicating machines or the like comprising suitable mechanism actuated by an operation lever which is movable from a first position to second and third positions.
  • the mechanism When the operation lever is shifted from the first position to the second position, the mechanism causes a detection lever to be moved in pivotal motion, a copy sheet feed roller to move upwardly, and a ratchet wheel for moving the copy sheet feed tray upwardly to be released, thereby permitting the copy sheet feed tray to move downwardly by its own weight to its lower position for the placing of a new stack of copy sheets thereon.
  • the operation lever When the operation lever is moved from the second position to the third position, the ratched wheel is rotated so as to move the copy sheet feed tray upwardly into pressing engagement with the copy sheet feed roller.
  • the operation lever When the operation lever is released, it automatically returns to the first position and the force with .which the copy sheet feed roller presses against the top of the new stack of copy sheets is automatically adjusted to an optimum level so that it is possible to feed each copy sheet under optimum conditions without requiring further adjustments.
  • This invention thus permits the copy sheet feed tray to be moved upwardly and downwardly by merely shifting the operation lever from the first position to the second and third positions, and the additional operation of adjusting the force with which the copy sheet feed roller presses against the top of the new stack of copy sheets on the copy sheet feed tray can be eliminated.
  • the need to manually perform the operations of raising the copy sheet feed roller, raising the copy sheet feed tray and lowering the copy sheet feed tray separately as is done in conventional devices of this type is eliminated.
  • These operations can be performed by merely shifting the operation lever from the first position to the second and third positions.
  • the operation of adjusting the force with which the copy sheet feed roller presses against the top of the new stack of copy sheets on the copy sheet feed tray can be eliminated, thereby simplifying the operation of placing a new stack of copy sheets on the copy sheet feed tray and greatly increasing printing efficiency.
  • FIG. 1 is a side view of a conventional copy sheet feed tray for rotary mimeograph printing machines in which the present invention can be incorporated.
  • FIG. 2 is a side view of the copy sheet feed tray raising and lowering device embodying the present invention.
  • FIGS. 3 to 5 are views illustrating the operation of the device shown in FIG. 2.
  • FIG. 6 is a side view of the segmental gear and the ratchet wheel portion of the device shown in FIG. 2.
  • FIG. 7 is a view illustrating the operation of the ratchet wheel and the feed roller force adjusting means.
  • FIG. 8 is a perspective view of the boss of the ratchet wheel shown in FIG. 7;
  • FIG. 9 is a fragmentary sectional view in plan of the ratchet wheel portion shown in FIG. 6.
  • a rotary mimeograph printing machine generally comprises a pair of (upper and lower) master cylinders having a screen entrained thereover, a pair of ink form rollers each maintained in pressing engagement with one of the two master cylinders, and a pressure roller maintained in pressing engagement with the lower master cylinder through the screen. Printing is carried out as a copy sheet fed by the copy sheet feed device is pressed by the pressure roller against the original to be duplicated which is mounted on the screen beforehand.
  • FIG. 1 such a screen 5 having an original 4 to be duplicated mounted thereon is shown entrained about a master cylinder 3 supported by a shaft 2 connected to a machine side plate '1 (shown in FIG. 2).
  • An ink form roller 6 is maintained in pressing engagement with the peripheral surface of master cylinder 3.
  • a copy sheet guide plate 13, and a wall 14 are also secured to the side plate 1.
  • Wall 14 is formed therein with an opening 14a through which projects leftwardly in the figure a portion of a drive pinion 16 mounted on the side plate 1 by a shaft 15.
  • a rack 17a of a rack plate 17 is maintained in meshing engagement with the projecting portion of pinion 16.
  • Cutouts 21a and 21b formed in copy sheet feed tray 21 engage pins 18 and 19, respectively, which are attached to rack plate 17.
  • Copy sheet feed tray 21 is provided with a guide side wall 24 which brings side edges of copy sheets 25 piled in a stack on copy feed tray 21 into alignment with one another. Front edges of the copy sheets 25 facing rightwardly in the figure are lightly held in place by a comer separator 26.
  • a copy sheet feed roller 28 supported by a shaft 27 is maintained in engagement with the top of the stack of copy sheets 25.
  • Shaft 27 is mounted at a free end of a supporter 29 which is secured at its base to a shaft 31 rotatably connected to the side plate 1.
  • the shaft 31 extends outwardly through the side plate 1 and has secured to the projecting end portion thereof a base 32b of a detection lever 32 as shown in FIG. 2.
  • Supporter 29 and detection lever 32 operate in a substantially integral manner with each other.
  • detection lever 32 is formed with a tab portion 32a having an opening for threadably receiving therein an adjusting screw 33. Adjusting screw 33 is maintained in engagement with a tab portion 34a formed on a charge member 34 which is supported by a shaft 35 connected to the side wall 1.
  • a spring 37 is mounted between a first lock member 36, also supported by shaft 35, and charge member 34 so that another tab portion 34b of charge member 34 is maintained in pressing engagement with sideedge 36b of first lock member 36 by the biasing force of spring 37.
  • Adjacent lock member 36 is a follower 39 which is supported by a shaft 38 connected to the side wall 1 and urged to pivot counter-clockwise by the biasing force of a spring 43 which is mounted at one end on a pin 41 attached to the side plate 1 and at the other end on a pin 42 attached to follower 39.
  • counterclockwise pivotal movement of follower 39 is normally precluded by the pressing engagement of an extended portion 390 formed on follower 39 with an offset.
  • Above follower 39 is a drive cam 44 mounted on shaft 2 supporting master cylinder 3 and adapted to be rotated clockwise, that is, in a direction opposite to the direction of rotation of master cylinder 3 by suitable reverse rotation means.
  • a roller 46 mounted at a free end of follower 39 by a shaft 45 is engaged by cam 44, moving follower 39 slightly against the action of spring 43 each time cam 44 makes one complete revolution, soas to reduce the force with which extended portion 39a is maintained in pressing engagement with offset portion 36a.
  • a feed pawl 48 pivotally connected to follower 39 by a shaft 47 is urged to pivot clockwise about shaft 47 by the biasing force of a spring 49 which is mounted at one end on a pin 51 attached to the side plate 1 and at the other end on a pin 48a attached to the pawl 48.
  • Feed pawl 48 is formed at its front end with a pawl member 48b which is maintained in pressing engagement with the peripheral edge of a ratchet wheel 55 by the biasing force of spring 49.
  • a reverse rotation check pawl 53 is pivotally supported by a shaft 54 connected to the side plate 1 and has a .pawl member 53a at its front end which is maintained in pressing engagement with the peripheral edge of ratchet wheel 55 by the biasing force of a spring 53b shown in FIG. 6.
  • Cutouts 56a and 56b are formed in a boss 56 of ratched wheel 55. Received in the two cutouts are opposite ends of a cotter pin 58 which secures a pinion 57 to shaft 15 (see FIG. 9). With this arrangement, ratchet wheel 55 is mounted on shaft 15 such that it can rotate freely relative to shaft 15 within limits defined by the side surfaces of the two cutouts 56a and 56b in boss 56 which abut against cotter pin 58 after permitting a degree of play as shown in FIG. 7.
  • a segmental gear 59 is maintained in meshing engagement with pinion 57 which segmental gear is pivotally supported at its base by a shaft 61 connected to the side plate 1.
  • a biasing spring 62 mounted on shaft 61 is maintained by a free end 62a thereof in pressing engagement with a tab portion 59a formed on segmental gear 59.
  • Spring 62 is maintained by the other end 62b thereof in engagement with a tab portion 63a formed in a click stopper 63 pivotally supported by a shaft 64 connected to the side wall 1.
  • a roller 65 mounted by a shaft at a free .end of click stopper 63 is maintained in pressing engagement in a recess 67 formed in an actuation cam 66, mounted on shaft 61, by the biasing force of spring 62.
  • An operation lever 71 in accordance with the present invention extends from an actuation cam 66 which has a tab portion 66a that is brought, by the weight of lever 71, into engagement with a straight arm portion 620 of spring 62.
  • Actuation cam 66 is formed with an opening 72 into which extends a roller 73 mounted on a shaft at a free end of detection lever 32. As subsequently to be described, roller 73 may be brought into engagement with a downwardly facing arcuate inner edge portion 72a an upwardly facing straight edge portion 72b and a valley 72c contiguous with edge portions 72a and 72b, as operation lever 71 is operated.
  • a release cam 74 for releasing pawl members 53a and 48b from engagement with ratchet wheel 55 is mounted on the shaft 15 which ratchet wheel 55 is mounted.
  • Release cam. 74 is urged to rotate clockwise by the biasing force of a spring 76, whose opposite ends are mounted on a pin 75 attached to a short arm of cam 74 and shaft 35 respectively; The short arm is maintained by one side edge in pressing engagement with a pin 77, attached to actuation cam 66, by the biasing force of spring 76.
  • copy-sheet feed roller 28 intermittently rotates in the direction of the arrow as the copy sheet feed mechanism (not shown) is actuated to feed one copy sheet 25 after another to the pair of delivery rollers 11 and 12 which deliver each copy sheet between master cylinder 3 and pressure roller 9, so that printing is carried out.
  • Copy sheet feed roller 28 gradually moves downwardly as the copy sheets 25 on copy sheet feed tray 21 are reduced in number, with supporter 29 pivoting counter-clockwise as shaft 31 angularly rotates in the same direction.
  • detection lever 32 shown in FIG. 2 which is substantially integral in operation with supporter 29 as aforesaid, pivots in the same direction and causes charge member 34 to pivot counterclockwise, so that some energy of resilience is gradually stored in spring 37.
  • the energy of resilience stored in spring 37 is low in magnitude, counter-clockwise pivotal movement of lock member 36 does not occur even if follower 39 is caused to slightly pivot clockwise by the action of cam 44 and the force with which extended portion 39a is maintained in pressing engagement with offset portion 36a is reduced.
  • lock member 36 continues to lock follower 39.
  • lock member 36 When the energy of resilience stored in spring 37 increases in magnitude with a reduction of the number of copy sheets 25 on copy sheet feed tray 21 by, for example, about sheets, then lock member 36 is caused to pivot counter-clockwise about shaft 35 by the biasing force of spring 37 when the force with which follower 39 is maintained in engagement with lock member 36 is reduced, thereby releasing follower 39 from engagement with lock member 36.
  • follower 39 makes one pivotal motion about shaft 38 in slaved relation to the rotation of cam 44.
  • feed pawl 48 angularly rotates ratchet wheel 55 clockwise a predetermined amount, and cotter pin 58 maintained in pressing engagement with the boss 56 of ratchet wheel 55 as shown in FIG. 7 pivots clockwise as shaft rotates in the same direction.
  • operation lever 71 is shown disposed in a first position in which it is inoperative and copy sheets are fed one after another to perform a printing operation.
  • operation lever 71 is' shifted clockwise to a second position shown in FIG. 4.
  • the roller 73 of detection lever 32 is pushed upwardly by the upwardly facing straight edge portion 72b of action cam 66 and into valley 720 as shown in FIG. 4.
  • Clockwise pivotal movement of detection lever 32 results in clockwise pivotal movement of copy sheet feed roller supporter 29 shown in FIG. 1 which is substantially integral in operation with detection lever 32, so that copy sheet feed roller 28 is moved upwardly to a dash-and-dot line position 28a in FIG. 1.
  • release cam 74 is caused to pivot counterclockwise by pin 77 during the clockwise pivotal movement of actuation cam 66.
  • ratchet wheel 55 and shaft 15 are thus released, copy sheet feed tray 21 which is mounted on the rack plate 17 in meshing engagement with the pinion 16 shown in FIG. 1 is free to move downwardly by its own weight to a predetermined position.
  • the segmental gear 59 in meshing engagement with pinion 57 angularly rotates and returns to a position shown in FIG. 4 in conjunction with the downward movement of copy sheet feed tray 21.
  • segmental gear 59 causes the drive pinion 16, shown FIG. 1, which is substantially integral in operation with pinion 57, to angularly rotate clockwise, thereby raising rack plate 17 and copy sheet'feed tray 21.
  • the position at which roller 73 comes into abutment with the arcuate edge portion 72a will vary depending on the number of copy sheets piled in a stack on copy sheet feed tray 21. The smaller number of copy sheets, the greater is the, counter-clockwise pivotal movement of operation lever 71., Regardless of the extent, however, the counter-clockwise angular movement of operation lever 71 is terminated as roller 73 is forcibly brought into abutting engagement with arcuate inner edge portion 72a.
  • the force with which roller 73 is brought into abutting engagement with inner edge portion 72a is produced by the action of the copy sheets on copy sheet feed tray 21 upwardly pushing copy sheet feed roller 28 and the manual force exerted on lever 71 in moving it from the second to the third position.
  • release cam 74 angularly rotates clockwise till it stops when the arm 74b thereof abuts against a stopper 78 affixed to the side plate 1.
  • This angular rotation of release cam 74 brings the pawl members 53a and 48b of check pawl 53 and feed pawl 48 respectively into engagement with ratchet 55 again as shown in FIG. 5.
  • segmental gear 59 angularly rotates counterclockwise, the cotter pin 58 attached to pinion 57 turns the boss 56 of ratchet wheel 55 clockwise in a manner shown in FIG. 6.
  • the amount of reverse movement of cotter pin 58 may thus be varied by regulating the dimensions of the cutouts 56a and 56b.
  • the pinion 16 secured to shaft 15 as shown in FIG. .1 rotates counterclockwise, thereby causing copy sheet feed tray 21 to move slightly downwardly.
  • the distance of this downward movement corresponds to the thickness of several number of copy sheets, so that the force with which copy sheet feed roller 28 presses against the top of the stack of copy sheets is brought to an optimum level which permits the carrying out of copy sheet feeding under satisfactory conditions.
  • Apparatus for raising and lowering a copy sheet feed tray in a duplicating machine comprising:
  • a copy sheet feed roller for feeding copy-sheets in succession from a stack of copy sheets on said feed tray to the machine
  • first cam means actuated by said operation lever for pivoting said detection lever when said operation lever is shifted to its second position so as to raise said feed roller;
  • second cam means actuated by said operation lever for preventing the pivoting of said detection lever when said operation lever is in its third position so as to maintain said feed roller in position when said feed tray is raised by the shifting of said operation lever to said third position whereupon said feed roller is urged upwardly by engagement with a stack of copy sheets on said feed tray.
  • lever means resiliently connected to said pivotable means and pivoted when said pivotable means pivots beyond a predetermined displacement
  • cam means rotated by said drive means and cooperating with said follower means upon the release of said follower means by said lever means to drive said feed pawl.
  • Apparatus as in claim 1, wherein the means connected to said operation lever for rotating said rotatable shaft when the operation lever is shifted to its third position comprises:
  • Apparatus as in claim 1 including a member on said operation lever having an edge with adjacent recesses therein and a spring loaded roller means riding on the edge of said member and respectively seating in said recesses when said operation lever is in its first and third positions for holding said operation lever in said positions.
  • said drive means comprises a continuously rotating cam means operatively connected to a master print cylinder of the duplicating machine.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US00209642A 1970-12-28 1971-12-20 Copy sheet feed tray raising and lowering device for duplicator or the like Expired - Lifetime US3724839A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45129418A JPS503682B1 (enrdf_load_stackoverflow) 1970-12-28 1970-12-28

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US3724839A true US3724839A (en) 1973-04-03

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US00209642A Expired - Lifetime US3724839A (en) 1970-12-28 1971-12-20 Copy sheet feed tray raising and lowering device for duplicator or the like

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US (1) US3724839A (enrdf_load_stackoverflow)
JP (1) JPS503682B1 (enrdf_load_stackoverflow)
DE (1) DE2164820C3 (enrdf_load_stackoverflow)
DK (1) DK144367C (enrdf_load_stackoverflow)
GB (1) GB1376898A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4330114A (en) * 1980-04-28 1982-05-18 Coombs Peter M Sheet delivery apparatus with horizontal plate
US6382619B1 (en) 2000-04-19 2002-05-07 Hewlett-Packard Company Pick mechanism and image forming device including the same
US20060226592A1 (en) * 2005-03-29 2006-10-12 Lexmark International Inc. Apparatus providing reduction in media skew during a sheet picking operation
US20060285447A1 (en) * 2005-06-01 2006-12-21 Sherman Raymond C Automatic, lockable and engageable/disengageable media tray
US20090008868A1 (en) * 2007-07-04 2009-01-08 Brother Kogyo Kabushiki Kaisha Sheet Feeding Device and Image Forming Apparatus
US20100109230A1 (en) * 2008-11-06 2010-05-06 Daniel Paul Cahill Media Sheet Feeding Method for Overcoming at Least One Media Handling Failure Mode
US9533844B2 (en) * 2015-04-07 2017-01-03 Kyocera Document Solutions Inc. Paper feeding device and image forming apparatus

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2301840C3 (de) * 1973-01-15 1981-03-26 MAN Roland Druckmaschinen AG, 63075 Offenbach Bogenauslegevorrichtung einer Bogendruckmaschine
DE3616804A1 (de) * 1986-05-17 1987-11-19 Kodak Ag Blattvereinzelungsvorrichtung
CN112005164B (zh) 2018-03-30 2023-09-12 日产化学株式会社 液晶取向剂、液晶取向膜和液晶表示元件

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2595015A (en) * 1949-12-03 1952-04-29 Bemis Bro Bag Co Lift control
US3652083A (en) * 1969-10-31 1972-03-28 John Benton Inc Paper feed mechanism
US3667385A (en) * 1968-10-11 1972-06-06 Ricoh Kk Paper feed table lifting device for a printing press

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2595015A (en) * 1949-12-03 1952-04-29 Bemis Bro Bag Co Lift control
US3667385A (en) * 1968-10-11 1972-06-06 Ricoh Kk Paper feed table lifting device for a printing press
US3652083A (en) * 1969-10-31 1972-03-28 John Benton Inc Paper feed mechanism

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4330114A (en) * 1980-04-28 1982-05-18 Coombs Peter M Sheet delivery apparatus with horizontal plate
US6382619B1 (en) 2000-04-19 2002-05-07 Hewlett-Packard Company Pick mechanism and image forming device including the same
US20060226592A1 (en) * 2005-03-29 2006-10-12 Lexmark International Inc. Apparatus providing reduction in media skew during a sheet picking operation
US7380783B2 (en) * 2005-03-29 2008-06-03 Lexmark International, Inc. Apparatus providing reduction in media skew during a sheet picking operation
US20060285447A1 (en) * 2005-06-01 2006-12-21 Sherman Raymond C Automatic, lockable and engageable/disengageable media tray
US7540491B2 (en) * 2005-06-01 2009-06-02 Hewlett-Packard Development Company, L.P. Automatic, lockable, engageable and disengageable media tray
US20090008868A1 (en) * 2007-07-04 2009-01-08 Brother Kogyo Kabushiki Kaisha Sheet Feeding Device and Image Forming Apparatus
US7984902B2 (en) * 2007-07-04 2011-07-26 Brother Kogyo Kabushiki Kaisha Sheet feeding device and image forming apparatus
US20100109230A1 (en) * 2008-11-06 2010-05-06 Daniel Paul Cahill Media Sheet Feeding Method for Overcoming at Least One Media Handling Failure Mode
US8113504B2 (en) * 2008-11-06 2012-02-14 Lexmark International, Inc. Media sheet feeding method for overcoming at least one media handling failure mode
US9533844B2 (en) * 2015-04-07 2017-01-03 Kyocera Document Solutions Inc. Paper feeding device and image forming apparatus

Also Published As

Publication number Publication date
DE2164820B2 (de) 1974-06-27
JPS503682B1 (enrdf_load_stackoverflow) 1975-02-08
GB1376898A (en) 1974-12-11
DE2164820A1 (de) 1972-07-13
DK144367B (da) 1982-03-01
DE2164820C3 (de) 1975-02-20
DK144367C (da) 1982-08-16

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