US3655183A - Sheet feed apparatus - Google Patents

Sheet feed apparatus Download PDF

Info

Publication number
US3655183A
US3655183A US3655183DA US3655183A US 3655183 A US3655183 A US 3655183A US 3655183D A US3655183D A US 3655183DA US 3655183 A US3655183 A US 3655183A
Authority
US
United States
Prior art keywords
tray
stack
cam
sheets
return
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
Inventor
John W Wagner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xerox Corp
Original Assignee
Xerox Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xerox Corp filed Critical Xerox Corp
Priority to US5414070A priority Critical
Application granted granted Critical
Publication of US3655183A publication Critical patent/US3655183A/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H1/00Supports or magazines for piles from which articles are to be separated
    • B65H1/08Supports 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
    • B65H1/18Supports 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 controlled by height of pile

Abstract

Sheet feed apparatus comprising a frame, a tray for supporting a stack of sheets adapted to be fed along a predetermined path, the tray mounted for pivotable movement on an axis a direction away from the direction in which feed is to be affected, a cam member operatively engageable with the lower portion of the tray to continually pivot the tray in an upward direction on the high rise portion of the cam and then return the tray to its original position upon a rotation of the cam to the low rise portion, drive means for operatively rotating the cam member in intermittent fashion upon receipt of discrete electrical signals, and control means associated with the stack for actuating the drive means when the top of the stack falls below a predetermined plane until the sheets have been fed.

Description

United States Patent Wagner [54] SHEET FEED APPARATUS [72] Inventor: John W. Wagner, Penfield, NY.

[73] Assignee: Xerox Corporation, Stamford, Conn.

[22] Filed: July 13, 1970 [21] Appl. No.: 54,140

[52] u.s.cn. ..27l/62,271/39 51] lnt.Cl. ..B65hl/18,B65h3/06 [58] Field oiSearch ..271/62, 39, 61, 30, 28, 24, 271/22 [56] References Cited UNITED STATES PATENTS 3,237,935 3/1966 3,265,383 8/1966 3,360,259 12/1967 3,067,885 12/1962 2,902,278 9/1959 3,025,052 3/1962 Gutteling ..271/28 FOREIGN PATENTS OR APPLICATIONS 1,168,202 10/1969 Great Britain ..271/39 [15] 3,655,183 [4 1 Apr. 11, 1972 Primary Examiner-Joseph Wegbreit Assistant Examiner-Bruce H. Stoner, Jr.

Attorney-James J. Ralabate, Norman E. Schrader and Melvin ein. a

[ ABSTRACT Sheet feed apparatus comprising a frame, a tray for supporting a stack of sheets adapted to be fed along a predetermined path, the tray mounted for pivotable movement on an axis a direction away from the direction in which feed is to be affected, a cam member operatively engageable with the lower portion of the tray to continually pivot the tray in an upward direction on the high rise portion of the cam and then return the tray to its original position upon a rotation of the cam to the low rise portion, drive means for operatively rotating the cam memberin intermittent fashion upon receipt of discrete electrical signals, and control means associated with the stack for actuating the drive means when the top of the stack falls below a predetermined plane until the sheets have been fed.

me insl'fim.

CONTROL LOGIC Patented April 11, 1972 INVENTOR JOHN w. WAGNER BY Q ATTORNEY SHEET FEED APPARATUS This invention relates to improvements in sheet feeding devices and particularly to an improved stack advancing mechanism.

It is commonly known to feed sheets from the top of a stack which normally requires an elevator to raise the stack to a constant level or alternatively a feeder which adjusts to different stack heights. This type of arrangement has placed undue restraints on some machine configurations as are used, for example, in the copying field.

It is an object of the present invention to improve sheet feed apparatus.

It is another object of the present invention to maintain the level of a stack of sheets to be fed in a manner more simple than heretofore.

It is still another object of the present invention to enable the feeding of a stack of sheets without complicated elevating mechanisms or associated equipment.

It is still another object of the present invention to feed sheet material without elevating feed rolls in the sheet material path.

The foregoing objects as well as others will become more apparent with the following description which is to be read in conjunction with the FlGURE showing the apparatus of the present invention.

The sheet feeding mechanism of the invention includes a nudger roll 18 adapted to feed the top sheet of a stack 19 of sheets on a tray 20 to feed rollers 22 and 24. As the sheets are fed into the rollers 22 and 24, one or more guide members 25 serve to guide the sheets into the nip of the rollers as well as ensure proper alignment of the leading edge of the stack of sheets. In feeding sheets from the stack one at a time, as the topmost sheet is advanced forward, the movement of the topmost sheet will tend to advance the second sheet also. In order to ensure separation of the topmost sheet from the stack,

roller 24 functions as a rejector roll through a slip clutch operating off the drive of the gearing from the positively driven roll 22.

In accordance with the present invention as sheets are fed from the top of the stack, the tray 20 is elevated by pivoting on an axis by means of a control mechanism as will now be described. Situated on the top of the stack in contact with the topmost sheet is a paper level sensing mechanism comprising a wheel 32 secured to an arm 34 which is pivotally mounted to a switch 36. As the sheets are fed, wheel 32 through gravity will try to follow the level of the sheets and such action will cause switch 36 to be energized and provide a signal to a control motor 38 through a control logic 58. Motor 38 provides the drive input to an elevating mechanism 39 which will now be described. The elevating mechanism 39 comprises a worm 40 which meshes with a worm wheel 42 which, in turn, drives a shaft 44 received by the wheel which shaft is mounted for rotation on suitable bearings. Mounted on the shaft 44 is an elevating cam member 50 which is eccentric in shape and serves to urge the lower surface of the tray member 20 upwardly under control of the sheet level sensing switch 36 thereby causing tray member 20 to pivot about the axis 30. Upon tray member 20 reaching its uppermost position, a switch 56 similar to switch 36 is actuated which is coupled to motor 38 through control logic 58. Control logic 58 serves to energize the motor until tray member 20 is returned to its original position through the action of a spring 60. At this time, a limit switch 62 is actuated to signal control logic 58 to deenergize motor 38.

It will now be appreciated that as the sheets from the-stack are fed, the tray member continues to maintain the topmost sheet into contact with the feed rolls 18 due to the action of the level sensing control and elevating mechanism just described. In this manner, the level of the stack is maintained at a predetermined height which enables separation and advancement of a single sheet from the stack without the re uirement of elevating feed rolls and the lilge.

t will be appreciated hat the tray mechanism of the present invention is a unique way for feeding a stack of sheets. I! does not require complicated drives or sensing mechanisms which are not only costly but tend to complicate and restrict the design of sheet feed apparatus. It will be further appreciated that the device of the invention can be used in many applications and is especially useful in the copying art where sheet feed mechanisms which are simple and reliable are in great demand.

What is claimed is:

1. An improved sheet feed apparatus comprising a frame,

a tray for supporting a stack of sheets adapted to be fed along a predetermined path,

said tray being mounted for pivotable movement on an axis in an upward direction,

a cam member operatively engageable with the lower portion of said tray to pivot said tray in an upward direction during operation on a high rise portion of said cam and then return said tray to its original position upon actuation of said cam to a low rise portion thereof,

drive means including a motor connected to a worm member driving a worm wheel operatively rotating said cam member in response to discrete electrical signals,

control means associated with said stack including first circuit means operative in response to the level of said stack for energizing said motor in intermittent fashion for actuating said drive means when the top of said stack falls below a predetermined plane until said sheets have been fed from said tray and second circuit means operative when said tray reaches its uppermost position for continuously energizing said motor to return said tray to its starting position, and

a spring member connected to said frame and the bottom of said tray to facilitate the return of said tray to its starting position.

Claims (1)

1. An improved sheet feed apparatus comprising a frame, a tray for supporting a stack of sheets adapted to be fed along a predetermined path, said tray being mounted for pivotable movement on an axis in an upward direction, a cam member operatively engageable with the lower portion of said tray to pivot said tray in an upward direction during operation on a high rise portion of said cam and then return said tray to its original position upon actuation of said cam to a low rise portion thereof, drive means including a motor connected to a worm member driving a worm wheel operatively rotating said cam member in response to discrete electrical signals, control means associated with said stack including first circuit means operative in response to the level of said stack for energizing said motor in intermittent fashion for actuating said drive means when the top of said stack falls below a predetermined plane until said sheets have been fed from said tray and second circuit means operative when said tray reaches its uppermost position for continuously energizing said motor to return said tray to its starting position, and a spring member connected to said frame and the bottom of said tray to facilitate the return of said tray to its starting position.
US3655183D 1970-07-13 1970-07-13 Sheet feed apparatus Expired - Lifetime US3655183A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US5414070A true 1970-07-13 1970-07-13

Publications (1)

Publication Number Publication Date
US3655183A true US3655183A (en) 1972-04-11

Family

ID=21989026

Family Applications (1)

Application Number Title Priority Date Filing Date
US3655183D Expired - Lifetime US3655183A (en) 1970-07-13 1970-07-13 Sheet feed apparatus

Country Status (1)

Country Link
US (1) US3655183A (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768803A (en) * 1972-02-11 1973-10-30 Xerox Corp Sheet feeder
US3921970A (en) * 1974-05-31 1975-11-25 Jay E Stanfield Paper feed regulating assembly for presses and duplicators
US4506877A (en) * 1982-08-04 1985-03-26 Savin Corporation Automatic biasing mechanism for paper cassette support plate
US4566684A (en) * 1984-01-12 1986-01-28 National Computer Systems Automatic sheet feed mechanism
US4763891A (en) * 1984-10-30 1988-08-16 Ricoh Company, Ltd. Sheet feed device for electronic copier, printer, etc.
US4872660A (en) * 1985-02-12 1989-10-10 Ricoh Company, Ltd. Sheet feed device for recording apparatus
US4888617A (en) * 1987-03-05 1989-12-19 Fuji Photo Film Co., Ltd. Sheet feeding mechanism for an image recording device
US5104111A (en) * 1989-02-17 1992-04-14 Minolta Camera Kabushiki Kaisha Sheet feed arrangement
US5106073A (en) * 1981-08-21 1992-04-21 Hitachi, Ltd. Sheet feeding device
US5195738A (en) * 1989-06-30 1993-03-23 National Computer Systems, Inc. Single sheet picking and transport mechanism
US5324018A (en) * 1992-03-31 1994-06-28 Eastman Kodak Company Paper transport system
US5480131A (en) * 1982-01-25 1996-01-02 Canon Kabushiki Kaisha Paper feeding device
EP0684141A3 (en) * 1994-05-24 1996-06-05 Canon Aptex Inc Printing apparatus, printing method and sheet feeding units thereof.
FR2733971A1 (en) * 1995-05-12 1996-11-15 Cp Bourg Sa Distributor of flat flexible envelopes
US20050047900A1 (en) * 2003-08-27 2005-03-03 Marius Buibas Object catch bin
US20060076728A1 (en) * 2004-09-30 2006-04-13 Brother Kogyo Kabushiki Kaisha Recording medium feeding device and image forming apparatus
US20070114716A1 (en) * 2005-11-22 2007-05-24 Pfu Limited Sheet feeding apparatus

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2902278A (en) * 1957-12-30 1959-09-01 Burroughs Corp Pneumatic controlled sheet feeder
US3025052A (en) * 1958-02-25 1962-03-13 Ibm Sheet feeding device
US3067885A (en) * 1959-02-24 1962-12-11 Conrad D Kohler Automatic panel feeder
US3237935A (en) * 1964-02-17 1966-03-01 Ibm Stack positioning document hopper feed
US3265383A (en) * 1965-04-22 1966-08-09 Eastman Kodak Co Film sheet feeder
US3360259A (en) * 1964-09-21 1967-12-26 Datron Systems Inc Tabulating card feed
GB1168202A (en) * 1968-02-08 1969-10-22 Pentacon Dresden Veb Sheet Feed Apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2902278A (en) * 1957-12-30 1959-09-01 Burroughs Corp Pneumatic controlled sheet feeder
US3025052A (en) * 1958-02-25 1962-03-13 Ibm Sheet feeding device
US3067885A (en) * 1959-02-24 1962-12-11 Conrad D Kohler Automatic panel feeder
US3237935A (en) * 1964-02-17 1966-03-01 Ibm Stack positioning document hopper feed
US3360259A (en) * 1964-09-21 1967-12-26 Datron Systems Inc Tabulating card feed
US3265383A (en) * 1965-04-22 1966-08-09 Eastman Kodak Co Film sheet feeder
GB1168202A (en) * 1968-02-08 1969-10-22 Pentacon Dresden Veb Sheet Feed Apparatus

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768803A (en) * 1972-02-11 1973-10-30 Xerox Corp Sheet feeder
US3921970A (en) * 1974-05-31 1975-11-25 Jay E Stanfield Paper feed regulating assembly for presses and duplicators
US5106073A (en) * 1981-08-21 1992-04-21 Hitachi, Ltd. Sheet feeding device
US5480131A (en) * 1982-01-25 1996-01-02 Canon Kabushiki Kaisha Paper feeding device
US4506877A (en) * 1982-08-04 1985-03-26 Savin Corporation Automatic biasing mechanism for paper cassette support plate
US4566684A (en) * 1984-01-12 1986-01-28 National Computer Systems Automatic sheet feed mechanism
US4763891A (en) * 1984-10-30 1988-08-16 Ricoh Company, Ltd. Sheet feed device for electronic copier, printer, etc.
US4872660A (en) * 1985-02-12 1989-10-10 Ricoh Company, Ltd. Sheet feed device for recording apparatus
US4888617A (en) * 1987-03-05 1989-12-19 Fuji Photo Film Co., Ltd. Sheet feeding mechanism for an image recording device
US5104111A (en) * 1989-02-17 1992-04-14 Minolta Camera Kabushiki Kaisha Sheet feed arrangement
US5195738A (en) * 1989-06-30 1993-03-23 National Computer Systems, Inc. Single sheet picking and transport mechanism
US5324018A (en) * 1992-03-31 1994-06-28 Eastman Kodak Company Paper transport system
EP0684141A3 (en) * 1994-05-24 1996-06-05 Canon Aptex Inc Printing apparatus, printing method and sheet feeding units thereof.
US5953035A (en) * 1994-05-24 1999-09-14 Canon Aptex Inc. Printing apparatus and printing method for use with rolled sheet and cut sheet feeding units
FR2733971A1 (en) * 1995-05-12 1996-11-15 Cp Bourg Sa Distributor of flat flexible envelopes
US20050047900A1 (en) * 2003-08-27 2005-03-03 Marius Buibas Object catch bin
US20060076728A1 (en) * 2004-09-30 2006-04-13 Brother Kogyo Kabushiki Kaisha Recording medium feeding device and image forming apparatus
US7467791B2 (en) * 2004-09-30 2008-12-23 Brother Kogyo Kabushiki Kaisha Recording medium feeding device and image forming apparatus
US20070114716A1 (en) * 2005-11-22 2007-05-24 Pfu Limited Sheet feeding apparatus
US8201823B2 (en) 2005-11-22 2012-06-19 Pfu Limited Sheet feeding apparatus

Similar Documents

Publication Publication Date Title
US3044770A (en) Sheet feeding device
US3469834A (en) Sheet feeder and separator apparatus
US4801134A (en) Paper feed apparatus capable of feeding of common use papers and specifically processed papers
US7591459B2 (en) Sheet feeding apparatus and image forming apparatus
US3894732A (en) Apparatus for converting a stack of sheets into a stream of overlapped sheets
US5026042A (en) Sheet feeder for copiers and printers
US3761079A (en) Document feeding mechanism
US3947018A (en) Universal feeder-stacker
US5326181A (en) Envelope addressing system adapted to simultaneously print addresses and bar codes
US20020074711A1 (en) Sheet sorting apparatus and automatic document feeder apparatus including the same
US3510125A (en) Document registration system
US6554270B2 (en) Sheet feeding apparatus, image reading apparatus and image forming apparatus
CA1121752A (en) Printer feeding and stacking
EP0680903A1 (en) Media sheet pick and feed system
US6059280A (en) Roller supporting device allowing easy replacement of separating roller
US3991998A (en) Document feed system
US5842694A (en) Stack height control with height sensing feedhead
US3963339A (en) Sheet feeding apparatus
US4212456A (en) Apparatus for automatically feeding individual sheets from a stack through an office machine
US3957366A (en) Sheet feeding apparatus
EP1380524B1 (en) Sheet feeding device and image forming apparatus equipped with the same
US20050035536A1 (en) Sheet conveying apparatus and image forming apparatus
US5384631A (en) Automatic document feeding apparatus
US3900192A (en) Sheet feeding apparatus
US4268021A (en) Transportation arrangement for sheetlike recording carriers