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US3758105A - Sheet catch tray for automatic sheet feeding apparatus - Google Patents

Sheet catch tray for automatic sheet feeding apparatus Download PDF

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Publication number
US3758105A
US3758105A US00073083A US3758105DA US3758105A US 3758105 A US3758105 A US 3758105A US 00073083 A US00073083 A US 00073083A US 3758105D A US3758105D A US 3758105DA US 3758105 A US3758105 A US 3758105A
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US
United States
Prior art keywords
housing
sheet
sheets
receiving plate
protrusion
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
US00073083A
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English (en)
Inventor
T Okamoto
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Application granted granted Critical
Publication of US3758105A publication Critical patent/US3758105A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B65H3/00—Separating articles from piles
    • B65H3/46—Supplementary devices or measures to assist separation or prevent double feed

Definitions

  • SHEET 2 (IF 2 NUMBER OF COPIES INVENTOR Yoo OKRMOTO BYWQ ATTORNEYS SHEET CATCH TRAY FOR AUTOMATIC SHEET FEEDING APPARATUS
  • the invention relates to a sheet catch tray for an automatic sheet feeding apparatus.
  • This sheet catch tray for an automatic sheet feeding apparatus holds a supply of printing paper or cut photosensitive sheets in a reproduction apparatus or a printing machine for continuously feeding sheets in cooperation with an automatic paper-feeding apparatus mounted to the feeder portion of said reproduction apparatus.
  • FIG. 1 is a perspective view of a sheet catch tray for an automatic sheet feeding apparatus, illustrating one embodiment of the present invention
  • FIGS. 2 and 3 are longitudinal sectional views of sheet catch trays, illustrating operative features thereof;
  • FIG. 4 is a view similar to those of FIGS. 2 and 3 but illustrating another embodiemtn of the present invention.
  • FIG. 5 is a diagram showing a relation between the pressure of sheet separation fingers against a supply of sheets and the number of the sheets.
  • the present sheet catch tray comprises a housing 1 for holding a supply of sheets, sheet separation fingers 2a and 2b for depressing both front corners of said sheets held in said housing 1, a sheet receiving plate 3 which is dropped down to the bottom of the housing 1 under gravitation and openings 4a and 4b formed in the front portion of said bottom of the housing 1.
  • This sheet catch tray holds a stack of sheets 5 on the sheet receiving plate 3, and causes to fit loosely into the openings 4a and 412, two supporting posts 5 (only one of them being shown in the drawings) which are set in parallel with each other to the feeder portion of the reproduction apparatus, whereby the front portion of the sheet receiving plate 3 is supported.
  • This sheet catch tray is mounted to the feeder portion of the reproduction apparatus in such a way as the back portion of the bottom of the housing 1 is supported by a housing supporting member 7 provided at the free end portion of an arm member 6 fixed to said feeder portion at the other end portion thereof, and the front portion of the housing 1 is suspended by the sheet separation fingers 2a and 2b.
  • a feed roller 8 provided at the feeder portion is pressed against said stack of sheets S by its own weight and the stack of sheets S is then depressed by the sheet separation fingers 2a and 2b at their front corners.
  • said roller 8 rotates in the direction shown by an arrow a, which causes the topmost sheet of the sheet stack S to proceed forward through frictional contact therewith.
  • the drive of the topmost sheet depends greatly on p 2 the pressure of the separation fingers 2a and 217 against the stack of sheets S, and in order to insure the separation of the topmost sheet only from the stack, said pres sure must be adjusted properly.
  • the preferable pressure there is a certain allowable range which is determined by experiments.
  • finger pressure The restraining pressure of the separation fingers 2a and 2b to the stack of sheets S (hereinafter being called finger pressure") depends mainly onthe weight of the housing 1 per se and the stack of sheets S contained therein.
  • said finger pressure P is expressed by the following equation:
  • L is the length from the front end of the housing 1 to the contact portion between the housing I and the housing support member 7; W, is the weight of the housing 1 at that portion; W is the weight of the housing 1 at the portion from the contact portion to the rear end; L, and L are respectively lengths from the contact portion to the points of action of W, and W that is, to the centers of the gravity of the above-mentioned portions; W, is the weight of the sheet receiving plate 3 and the stack of sheets S which bears on the contact portion between the rear end of the sheet receiving plate 3 and the housing I; and I0 is the length from this contact portion to the contact portion between said housing 1 and the housing receiving member 7.
  • W, and W are mainly determined by the size of the housing 1 and the kind of its material, whereas L, L,, L and 10 are determined by the size of the housing 1 and the position of the contact portion between the housing 1 and. the housing support member 7.
  • the size of the housing 1 is mainly determined by the size of a stack of sheets S to be housed therein, and W, is mainly determined by the quantity of the sheets.
  • W is mainly determined by the quantity of the sheets.
  • P is increased along with the gradual decrease of W,.
  • the allowable limits of the finger pressure P is in the range from P,, to P, in FIG. 5 (this range being determined by experience as mentioned above), and the size of the housing 1 is such as to contain a certain size of sheets, and assuming that the quantities such as W,, W L, L,, L and 10 in the equation (1) are set in accordance with the position of the contact portion between the housing 1 and the housing supporting member 7 so that the finger pressure P may be within the range from P,, to P,, the finger pressure P will be increased along the straight line A in accordance with the successive decrease of the stack of sheets in the housing, for example, from the maximum number of sheets 200, that is, in accordance with the decrease of W, as seen in FIG. 5.
  • the finger pres sure P will not be decreased to less than the lower threshold pressure P,, even if a large number of sheets are introduced, nor increased more than the upper threshold pressure P, even if the housing 1 becomes empty.
  • the instant problem lies in the position of the contact portion between the housing 1 and the housing support member 7, which determines the values of L, L L and lo in the equation (1
  • Both the arm member 6 and the housing support member 7 are fixed and their lengths are usually determined in accordance with a catch tray which contains a stack of sheets of the smallest size. For this reason, it is practically impossible to greatly change the position of the contact portion in accordance with the catch tray of all sizes. Further, assuming that the adjustment is effected whenever the size of the sheet is changed, the operation processes in a printing machine or a reproduction apparatus will be increased and complexity will also be increased.
  • an object of the invention to provide a sheet catch tray for an automatic sheet feeding apparatus which overcomes the above-mentioned drawbacks and enables feeding of sheets of all sizes continuously and smoothly through the simplest way.
  • the bottom plate of the housing 1 is provided with a protrusion 9 of any height which supports the rear portion of the sheet receiving plate 3.
  • a sheet catch tray as seen in FIG. 2
  • the weights W, of both the stack of sheets S and the rear portion of the sheet receiving plate 3 bear on said protrusion 9.
  • the back portion of the bottom of the housing 1 is provided with a fulcrum member 10 at the position corresponding to the housing supporting member 7, and in the present invention the fulcrum member 10 is in contact with the housing support member 7.
  • the finger pressure P is expressed by the following equation:
  • I is the distance between the protrusion 9 and the fulcrum member 10.
  • the position of the protrusion 9 is changed as a design matter whenever the size of the housing I is changed in accordance with the size of a stack of sheets contained therein, and is determined so that the value of 1 in the equation (2) may be such as the finger pressure P is always within the allowable limiting range from P to P,. That is to say, in the sheet catch tray of the present invention, even if the stack of sheets S contained in the housing I is of any size, the finger pressure P may be changed to a suitable value along a straight line A as shown in FIG. 5 by means of the protrusion 9, and therefore, it is always possible to set the pressure within a preferable pressure range, which results in feeding a single sheet out of the stack of sheets S smoothly.
  • the fulcrum member 10 It is not always necessary to provide the fulcrum member 10, but it is desirable to provide it since it is by means of this fulcrum member 10 that the position of the sheet catch tray is changeable in design in accordance with the size of the sheet catch tray and since it is possible to set the values of L, L and L in the equation (2) so that the finger pressure P may be in the suitable range. Furthermore, in the case fulcrum member 10 is provided, the following advantages are obtainable.
  • FIG. 4 there is shown a sheet catch tray which is provided with a protrusion 11 in place of the abovementioned protrusion 9, both the position and the height of said protrusion 11 being determined, that is, the position is determined so that, when the housing 1 is filled with a stack of sheets, the value of I in the equation (2) may be such as the finger pressure P becomes a suitable one, and the height thereof is determined so that, when the housing 1 is rotated on the protrusion 11 as a fulcrum in the counterclockwise direction to increase its inclination, the bottom surface of the sheet receiving plate 3 may become free from the protrusion 11 and at the same time the rear end 3a of the sheet receiving plate 3 may come in contact with the bottom of the housing 1.
  • FIG. 4 The condition in which said rear end 3a is supported by the housing 1 is shown in FIG. 4.
  • the protrusion 11 With the position and the height of which are set as mentioned above, the supporting position in the rear portion of the housing 1 which supports the sheet receiving plate 3 is transferred from the protrusion 11 to the rear end portion of the receiving plate 3 during the decreasing process of the stack of sheets S. Accordingly, the finger pressure P is changed in accordance with the equation (2) from the beginning of the sheet feeding operation to the middle of the operation, whereas the same is changed in accordance with the equation (I) from the middle of the operation.
  • each of theprotrusions 9 and 11 and the fulcrum member 10 is made in the shape of a flat narrow plate in the embodiments described above and illustrated in the drawings, in the sheet catch tray of the present invention their shapes may be optional, for example, they may be outwardly curved ones or flat wide plates.
  • the protrusions 9 and 11 may be provided in the sheet receiving plate 3, not in the housing 1.
  • the mounting of the separation fingers 2a and 2b is of course optional, for example, they may be formed integral with the housing 1 as seen in FIG. 1 or they may be made as separate members and may be suitably fixed to the housing 1.
  • the above-mentioned housing 1 is covered with a sheet protecting cover. This cover is slidable on the housing 1, and the cover is designed so as to be half or fully opened so that in the sheet feeding operation the separation fingers 2a and 2b and the roller 8 are positioned into pressure contact with the stack of sheets 8.
  • a sheet catch tray for an automatic sheet feeding apparatus comprising a housing, sheet separation fingers which depress both front corners of the sheets contained in said tray, a sheet receiving plate which is loosely dropped down to the bottom of the housing, openings formed in the bottom of said housing through which supporting posts are upwardly inserted to support the forward portion of said sheet receiving plate and a protrusion formed between the bottom of said housing and said sheet receiving plate to support the back portion of said sheet receiving plate, said protrusion being located at such a position so that the pressure of said sheet separation fingers against the sheets becomes a suitable pressure so as to separate a single sheet from the stack of sheets when said sheet receiving plate and the back bottom surface of said housing are supported by said supporting posts and a housing support member, respectively, and the front portion of said housing is suspended by said sheet separation fingers, and
  • a sheet catch tray for an automatic feeding apparatus comprising:
  • a housing having openings formed in the bottom thereof; sheet separation finger means mounted on said housing for depressing both front comers of sheets disposed in said tray and for supporting the front portion of said housing in its mounted position; a sheet receiving plate loosely supported on the bottom of said housing; supporting means, including a post member inserted through said openings in said housing for supporting the forward portion of said sheet receiving plate and a housing support member contacting the bottom of said housing at the outside thereof; and means for ensuring the application of a pressure of said sheet separation finger means against said sheets for separating a single sheet from a stack of sheets when said sheet receiving plate and said housing are supported by said supporting means and the front portion of said housing is suspended by said sheet separation finger means, comprising a protrusion member disposed between the bottom interior of said housing and said sheet receiving plate and being displaced with respect to the point of contact of said housing support member with said housing, wherein said protrusion member is positioned so that the rear portion of the sheet receiving plate contacts the bottom of the housing when said housing is rotated about a fulcrum

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Pile Receivers (AREA)
  • Replacement Of Web Rolls (AREA)
US00073083A 1969-10-22 1970-09-17 Sheet catch tray for automatic sheet feeding apparatus Expired - Lifetime US3758105A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44084546A JPS4926847B1 (de) 1969-10-22 1969-10-22

Publications (1)

Publication Number Publication Date
US3758105A true US3758105A (en) 1973-09-11

Family

ID=13833632

Family Applications (1)

Application Number Title Priority Date Filing Date
US00073083A Expired - Lifetime US3758105A (en) 1969-10-22 1970-09-17 Sheet catch tray for automatic sheet feeding apparatus

Country Status (6)

Country Link
US (1) US3758105A (de)
JP (1) JPS4926847B1 (de)
CA (1) CA939405A (de)
DE (1) DE2051321C3 (de)
FR (1) FR2062833A5 (de)
GB (1) GB1331237A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033577A (en) * 1974-09-18 1977-07-05 La Cellophane Sheet feeding devices
US4165871A (en) * 1976-05-14 1979-08-28 Tokyo Shibaura Electric Co., Ltd. Pattern reading device
US4265442A (en) * 1979-09-17 1981-05-05 Nashua Corporation Cassette locking and alignment assembly
US4363477A (en) * 1979-02-02 1982-12-14 Olympus Optical Company, Ltd. Extra sheet feeder for copying machine
US4505571A (en) * 1978-11-02 1985-03-19 Mita Industrial Co. Ltd. Copy paper supply system for a transfer type electrostatic copying apparatus
US4826147A (en) * 1984-09-12 1989-05-02 Rank Xerox Limited Paper feed cassette
US4830354A (en) * 1986-05-14 1989-05-16 Xerox Corporation Sheet feed apparatus and cartridge therefor
US5005820A (en) * 1989-06-23 1991-04-09 International Business Machines Corporation Paper tray with leaf spring
US6286827B1 (en) * 1999-11-18 2001-09-11 Xerox Corporation High capacity automatic sheet input system for a reproduction apparatus
US20050211720A1 (en) * 2000-05-23 2005-09-29 Munroe Chirnomas Method and apparatus for storing articles for use with an article handling device
US20210204765A1 (en) * 2019-12-18 2021-07-08 Essity Hygiene And Health Aktiebolag Apparatus and methods for paper dispensing

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1005130B (zh) * 1985-01-08 1989-09-06 夏普公司 复印机及其类似设备的喂纸盒放置就位机构

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1582610A (en) * 1924-02-28 1926-04-27 Bakeries Service Corp Card or pamphlet holding and feeding device
US2922644A (en) * 1957-04-25 1960-01-26 Dick Co Ab Sheet separating mechanism for duplicators
US3339916A (en) * 1965-03-19 1967-09-05 Addressograph Multigraph Sheet feeding assembly
US3343716A (en) * 1966-03-22 1967-09-26 Peebles David Meade Dispensers for facial tissues and the like
US3533617A (en) * 1967-03-29 1970-10-13 Omal Group Ltd Sheet feeding arrangements for feeding sheets from a stack thereof
US3635468A (en) * 1968-09-30 1972-01-18 Ricoh Kk Sheet container and feeding device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1582610A (en) * 1924-02-28 1926-04-27 Bakeries Service Corp Card or pamphlet holding and feeding device
US2922644A (en) * 1957-04-25 1960-01-26 Dick Co Ab Sheet separating mechanism for duplicators
US3339916A (en) * 1965-03-19 1967-09-05 Addressograph Multigraph Sheet feeding assembly
US3343716A (en) * 1966-03-22 1967-09-26 Peebles David Meade Dispensers for facial tissues and the like
US3533617A (en) * 1967-03-29 1970-10-13 Omal Group Ltd Sheet feeding arrangements for feeding sheets from a stack thereof
US3635468A (en) * 1968-09-30 1972-01-18 Ricoh Kk Sheet container and feeding device

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033577A (en) * 1974-09-18 1977-07-05 La Cellophane Sheet feeding devices
US4165871A (en) * 1976-05-14 1979-08-28 Tokyo Shibaura Electric Co., Ltd. Pattern reading device
US4505571A (en) * 1978-11-02 1985-03-19 Mita Industrial Co. Ltd. Copy paper supply system for a transfer type electrostatic copying apparatus
US4363477A (en) * 1979-02-02 1982-12-14 Olympus Optical Company, Ltd. Extra sheet feeder for copying machine
US4265442A (en) * 1979-09-17 1981-05-05 Nashua Corporation Cassette locking and alignment assembly
US4826147A (en) * 1984-09-12 1989-05-02 Rank Xerox Limited Paper feed cassette
US4830354A (en) * 1986-05-14 1989-05-16 Xerox Corporation Sheet feed apparatus and cartridge therefor
US5005820A (en) * 1989-06-23 1991-04-09 International Business Machines Corporation Paper tray with leaf spring
US6286827B1 (en) * 1999-11-18 2001-09-11 Xerox Corporation High capacity automatic sheet input system for a reproduction apparatus
US20050211720A1 (en) * 2000-05-23 2005-09-29 Munroe Chirnomas Method and apparatus for storing articles for use with an article handling device
US20210204765A1 (en) * 2019-12-18 2021-07-08 Essity Hygiene And Health Aktiebolag Apparatus and methods for paper dispensing
US12144470B2 (en) * 2019-12-18 2024-11-19 Essity Hygiene And Health Aktiebolag Apparatus and methods for paper dispensing

Also Published As

Publication number Publication date
JPS4926847B1 (de) 1974-07-12
CA939405A (en) 1974-01-01
DE2051321C3 (de) 1974-03-14
DE2051321A1 (de) 1971-06-24
FR2062833A5 (de) 1971-06-25
GB1331237A (en) 1973-09-26
DE2051321B2 (de) 1973-08-23

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