US3044770A - Sheet feeding device - Google Patents

Sheet feeding device Download PDF

Info

Publication number
US3044770A
US3044770A US85230A US8523061A US3044770A US 3044770 A US3044770 A US 3044770A US 85230 A US85230 A US 85230A US 8523061 A US8523061 A US 8523061A US 3044770 A US3044770 A US 3044770A
Authority
US
United States
Prior art keywords
friction
sheet
roller
sheets
conveyor
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
US85230A
Other languages
English (en)
Inventor
Breuers Theo Pierre Chretien
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.)
Chemische Fabriek L Van der Grinten NV
Original Assignee
Grinten Chem L V D
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 Grinten Chem L V D filed Critical Grinten Chem L V D
Application granted granted Critical
Publication of US3044770A publication Critical patent/US3044770A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B65H3/52—Friction retainers acting on under or rear side of article being separated
    • B65H3/5246—Driven retainers, i.e. the motion thereof being provided by a dedicated drive
    • B65H3/5253—Driven retainers, i.e. the motion thereof being provided by a dedicated drive the retainers positioned under articles separated from the top of the pile
    • B65H3/5261—Retainers of the roller type, e.g. rollers

Definitions

  • the invention relates to a device for feeding out, one by one, sheets of laminar material, such as paper, cardboard, and the like, which together form a stack, said device comprising a positively driven conveyor member and a movable friction member cooperating under pressure with the conveyor member and acting upon the sheets, the cooperating parts of which members move along closed tracks and between which members the sheets are fed out, the direction of movement of the friction member being dependent on the possible presence between friction member and conveyor member of at least two superimposed sheets of laminar material, and the friction between friction member and laminar material as well as the friction between conveyor member and laminar material being greater than the friction between two sheets of laminar material.
  • a device which comprises a positively driven conveyor roller and a friction roller pressing against the conveyor roller.
  • the friction roller is connected with one end of a helical spring, while the other end of the helical spring is connected with the frame of the device via a slip clutch.
  • the sheets are pushed from the stack and fed into the nip between conveyor roller and friction roller by means of a feed roller.
  • the slip clutch and the pressure between friction roller and conveyor roller are adjusted in such a way that if only one sheet gets between friction roller and conveyor roller, the sheet is taken along by the conveyor roller and fed out. The sheet in its turn drives the friction roller.
  • the helical spring is thus wound up and tensioned. When the tension of the spring has risen to a maximum permissible value, the slip clutch will slip. The spring thus tensioned tends to drive the friction roller in a direction opposite to that in which the'sheet fed through is moving and consequently exerts a retarding action on the said sheet.
  • the sheet that has been rubbed back can then still be fed through the device together with the sheet that has already been partly fed out.
  • the capacity of the helical spring is limited. When handling a stack of sheets which adhere somewhat to each other (eg due to static electricity or deformed edges), two or more sheets at a time may repeatedly get between friction roller and conveyor roller. The helical spring will soon be released under such conditions.
  • Another disadvantage of the known device is that, if the spring has been fully tensioned, the friction roller exerts a retarding force which is greater than the force that is required for the rubbing-back, because, if it were not so, this force might soon fall below the minimum necessary value during the release of the spring.
  • the device according to the present invention is equipped with continuously operating driving members for the friction member, and a slip clutch between the driving members and the friction member, said driving members continuously tending to drive the friction member via the slip clutch with a force which is always sufficient to overcome the friction between two sheets of laminar material in a direction opposite to the direction in which it is influenced by the conveyor member.
  • the device according to the invention owing to the continuously operating driving members, has the advantage that the friction member is always able to exert a retarding action with a constant force. A reliable operation is thus obtained, even if sheets adhering to each other are handled, and even if repeatedly some of them are simultaneously fed between friction member and conveyor member, and the friction member has to move almost continuously contrary to the movement of the conveyor member.
  • the device To ensure reliable operation it is naturally necessary for the device to be adapted to the nature of the sheets to be handled. Generally speaking, its construction should be such that the driving force which is exerted on the friction member via the slip clutch is greater than the driving force exertedby the conveyor member (if two or more sheets are present between this member and the friction member) on the friction member via these sheets, but
  • the projecting sheet will at first be gripped by the conveyor member and will be fed further. It is not until the other sheet has moved so far that it has arrived in the zone between friction member and conveyor member that the movement of the friction member will change direction. The sheet with the projecting edge is then rubbed back, while the other sheet is fed further. If one sheet projects far beyond the other sheet, it might not have been rubbed back altogether when the other sheet has already been passed through altogether. The sheet that is rubbed back would then be gripped again by the conveyor member, and be fed out while partly overlapping the sheet which has already been passed through.
  • the device according to the invention is preferably so constructed that the velocity of rotation of the driving member of the slip clutch has such a value that the circumferential speed of the friction member, when being driven via the slip clutch, is considerably greater than the circumferential speed of the conveyor member (1.5-3 times as large, for instance).
  • the device being adjusted in such a way that the direction of movement of the friction member is not reversed until at least two sheets are present between said member and the conveyor member, the friction member counteracting at great speed cannot do damage to the sheets. Even sheets carrying easily damaged texts or images can be fed through the device without risk of damage.
  • FIGURE 1 is a diagrammatical longitudinal section of a device according to the invention, with which invariably th lowermost sheet of a stack of sheets is fed out.
  • FIGURE 2 is a diagrammatical cross-section of the device according to FIGURE 1.
  • FIGURE 3 is a diagrammatical longitudinal section of a device according to the invention, in which upon feedingout of the sheets it is invariably the uppermost sheet of the stack which is fed out.
  • the device according to FIGURES 1 and 2 is provided with a conveyor roller 1, which has a cover of wearresistant elastic rubber.
  • the roller 1 which is supported in stationary bearings in frame 2, is continuously driven as indicated by an arrow.
  • Shaft 3 on which some friction discs 4 are mounted at distances of 10 cm., for instance, is supported in frame 2 so as to be vertically movable.
  • the friction discs 4, which rest against the cover of roller 1 under pressure caused by their own weight and the weight of shaft 3 and of the parts (to be mentioned hereinafter) connected with siiaft 3, have a cover of Vulkollan (polyurethane of Bayer A.G., Leverkusen, Germany).
  • gear wheel 8 mounted on a journal of conveyor roller 1 extending through frame 2 is a wheel 5, which is provided with a toothed rim cooperating with the teeth of pinion 6. Pinion 6 cooperates with a gear wheel 8, which is adapted to rotate on journal 7 of the shaft 3. When roller 1 is driven, gear wheel 8 rotates as indicated by the dotted arrow.
  • Gear wheel 8 forms part of a slip clutch system mounted on journal 7, which furthermore comprises slipping discs 9 and E3, clutch discs 11 and 12, spring 13, and nut 14.
  • Clutch disc 11 is rigidly connected with journal 7;
  • clutch disc 12 is equipped with a projecting key, adapted to slide in a slot in journal 7. Consequently clutch disc 12 can be moved in the axial direction on journal 7.
  • Nut 14 can be moved over the threaded end of journal 7, and thus the degree of compression of spring 13 can be varied by means of nut 14, and consequently the value of the couple which is transmitted to shaft 3 via the slip clutch and which naturally has to be adapted to the nature of the sheets to be handled, can be adjusted.
  • roller 1 The diameters of roller 1, friction discs 4, wheel 5 and gear wheel 3 have been so chosen that the circumferential peed of the discs 4 is about one and a half times as neat as the circumferential speed of roller 1.
  • a stack of sheets 16 is arranged, of which the lowermost sheet extends with one edge into the nip between conveyor roller 1 and friction discs 4,
  • this sheet is gripped and taken along by the rubber cover of roller 1. Owing to friction between the sheet and the covers of friction discs 4 the sheet also exerts a driving force on the friction discs. This force counteracts the couple which acts on the friction discs via the slip clutch and shaft 3 described above.
  • the slip clutch has been adjusted in such a way that the couple exerted by it is too small to overcome the friction between the sheet and the friction discs. Consequently the friction discs turn with the sheet, while the slip clutch, which continuously tends to drive discs 4 in the opposite direction, will slip.
  • roller 13 which is supported in stationary bearings, is driven continuously via rope 20, which lies in a groove of wheel 5 and a rope pulley on the journal of roller 18.
  • Roller 19, which is supported in bearings so as to be vertically movable, under the influence of its own weight rests on roller 13 and thus is also driven continuously.
  • an arresting plate 21 which extends the full width of the device with its lowermost edge parallel to and at a short distance from the feeding table, is mounted in such a way that near the nip between friction member and conveyor member a narrow slit is present between the lower edge of the arresting plate and table 15.
  • roller 1 is no longer able to exert suflicient driving force on friction discs 4 via the sheets, because the friction between the sheets is too small.
  • the friction discs are then no longer driven by roller 1, but by the slip clutch. In consequence their movement changes direction. Owing to friction the sheet coming into contact with the friction discs is taken along by the friction discs and thus rubbed back beyond the nip between roller 1 and discs 4. It is not until the lowermost sheet has passed completely between roller 1 and friction discs 4 that the sheet which has been rubbed back is able to pass between roller 1 and discs 4 again. If more than two sheets at a time pass through the slit between table 15 and plate 21 and get between conveyor roller 1 and friction discs 4, the lowermost of them is fed out normally, while all the other sheets are rubbed back successively by the friction discs.
  • the device described above has a simple construction and is extremely suitable for feeding out one by one sheets which together form a loose stack of not too great a size. It is suitable, for instance, for automatically feeding documents or transparent originals to continuously operating photographic reproduction apparatus.
  • FIGURE 3 is a diagrammatical illustration of a device according to the invention, by means of which large stacks of sheets can be handled.
  • This device comprises a conveyor roller 1 supported in stationary bearings in frame 2 and driven (by members not shown) in the direction of the arrow, and a friction disc 4 resting against roller 1 under pressure.
  • the shaft of friction disc 4 rests in bearings 22, adapted to slide in slots in frame 2.
  • the compression of the helical springs 36 can be varied, and thus the pressure between friction disc 4 and conveyor roller 1 can be adapted to the nature (smoothness and evenness of the surface) of the sheets to be handled.
  • Friction disc 4 accordingly is influenced by a driving force, which is exerted by roller 1, and a couple counteracting this force, which is caused by the slip clutch.
  • Friction disc 4 and conveyor roller 1 are both covered with a high-friction, somewhat elastic, and wear-resistant material.
  • a rubber-covered feed roller 24 which is driven continuously with the aid of rope 25 and the rope pulleys 26 and 27, which are fixed on journals of the rollers 1 and 24 respectively.
  • the stack of sheets 16 to be fed out is put on a table 28 that is movable in the vertical direction.
  • Table 28 is fitted with sliding sleeves 29, adapted to slide on stationary bars 30, and with an elongated rack 31.
  • Gear Wheel 32 is continuously influenced for this purpose, by a motor via a slip clutch, for instance.
  • the vertical plate 33 acts as a stop when the sheets to be handled are put in the apparatus.
  • Feed roller 24 continuously pushes sheets from stack 16 to the nip between conveyor roller 1 and friction disc 4. The quantity of sheets is limited by the width of the slit between conveyor roller 1 and the curved upper end of plate 33.
  • the device With the aid of adjusting screws 26 and the nut of the slip clutch system the device is adjusted in such a way that the friction disc is driven by the conveyor roller if one sheet is present between conveyor roller and friction disc, but that the friction disc is driven in the opposite direction by the slip clutch if two or more sheets are present between conveyor roller and friction disc.
  • roller 24 If one sheet is thus pushed from stack 16 by roller 24, this sheet is gripped by conveyor roller 1 and fed out via the guiding members 34 and 35. If roller 24 pushes several sheets at a time between conveyor roller and friction disc, only the uppermost sheet is fed out, while the other sheets are rubbed back successively by the counter-rotating friction disc.
  • the device according to FIGURE 3 is suitable for successively feeding out large numbers of sheets of laminar materiaL- With the aid of adjusting screws 23- and the nut on the slip clutch, the device can be adjusted for handling sheets of several kinds, which vary widely in respect of smoothness and evenness.
  • the device is extremely suitable as a sheet-feeding device forming part of or being used in apparatus for handling sheets, such as photoprinting apparatus and ofiset printing machines.
  • the conveyor member used in the devices described above is a conveyor roller.
  • Other members such as a conveyor belt or a number of parallel endless belts, may be used as conveyor members.
  • friction rollers or belts may also be employed.
  • Device for feeding out, one by one, sheets of laminar material, which together form a stack comprising a positively driven conveyor member and a movable friction member cooperating under pressure with the conveyor member, the cooperating parts of which members move along closed tracks and between which members the sheets are fed out, the direction of movement of the friction member being dependent on the possible presence between the friction member and the conveyor member of at least two super-imposed sheets of laminar material, while the friction between the friction member and one of the sheets as well as the friction between the conveyor member and one of the sheets is greater than the friction between two of the sheets, continuously operating driving means for the friction member, including driving members and a slip clutch between the driving members and the friction member, continuously tending to drive the friction member via the slip clutch, with a force which is always suificient to overcome the friction between two of the sheets of laminar I material, in a direction opposite to the direction in which the friction member is influenced by the conveyor member.
  • said driving means being operative with a speed of rotation such that the circumferential speed of the friction member, when being driven via the slip clutch, is considerably greater than the circumferential speed of the conveyor member.
  • a device which further comprises a feeding table sloping downwards in the direction of delivery of the sheets and, mounted above said table near the nip between the friction member and the conveyor member, an arresting plate the lowermost edge of which extends parallel to and at a short distance from the feeding table.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US85230A 1960-02-02 1961-01-27 Sheet feeding device Expired - Lifetime US3044770A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL247994 1960-02-02

Publications (1)

Publication Number Publication Date
US3044770A true US3044770A (en) 1962-07-17

Family

ID=19752152

Family Applications (1)

Application Number Title Priority Date Filing Date
US85230A Expired - Lifetime US3044770A (en) 1960-02-02 1961-01-27 Sheet feeding device

Country Status (5)

Country Link
US (1) US3044770A (it)
BE (1) BE599465A (it)
CH (1) CH396952A (it)
GB (1) GB922780A (it)
NL (1) NL247994A (it)

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3108801A (en) * 1960-06-28 1963-10-29 Nederlanden Staat Device for conducting postal articles, forms or the like
US3272500A (en) * 1960-01-25 1966-09-13 Nederlanden Staat Device for guiding postal articles, forms or the like
US3295139A (en) * 1963-10-09 1966-12-27 Universal Match Corp Depository machine
US3583696A (en) * 1967-08-11 1971-06-08 Ruenzi Kurt Apparatus for feeding and removal of flat items into and from a processing machine
US3584867A (en) * 1969-05-19 1971-06-15 Us Navy Card input hopper
US3594549A (en) * 1968-06-05 1971-07-20 Scan Data Corp Document handler
US3614089A (en) * 1969-06-16 1971-10-19 Copystatics Mfg Corp Automatic original feeder for copying machine
US3754754A (en) * 1971-12-03 1973-08-28 Honeywell Inf Systems Document separator for accidental bunching
US3788638A (en) * 1971-01-29 1974-01-29 Baeuerle Gmbh Mathias Roller arrangement, in particular for paper folding, creasing and like machines
US4105199A (en) * 1975-12-22 1978-08-08 Nippon Electric Co., Ltd. Paper feeder comprising a selectively drivable resilient body in frictional contact with a feed roller
DE3023893A1 (de) * 1979-06-27 1981-01-22 Savin Corp Vorrichtung zum zufuehren von blaettern, insbesondere von kopierpapierblaettern
US4305525A (en) * 1978-11-18 1981-12-15 Nixdorf Computer Ag Method and arrangement for dispensing sheet material
US4420149A (en) * 1979-01-29 1983-12-13 Savin Corporation Automatic original document feeder for electrophotographic copier
JPS5961138U (ja) * 1982-10-15 1984-04-21 株式会社リコー 給紙装置
EP0116895A2 (en) * 1983-02-16 1984-08-29 Hitachi, Ltd. Automatic sheet feeding device
US4548395A (en) * 1983-02-04 1985-10-22 Donald L. Snellman Microfiche feeder
US4607833A (en) * 1984-09-14 1986-08-26 Bell & Howell Company Demand document feeder
US4674735A (en) * 1983-12-07 1987-06-23 R. Clark DuBois Automatic sheet feeder for copiers and other machines having sheet transport mechanisms and assemblies therewith
US4801134A (en) * 1986-03-04 1989-01-31 Minolta Camera Kabushiki Kaisha Paper feed apparatus capable of feeding of common use papers and specifically processed papers
US4884796A (en) * 1988-05-26 1989-12-05 Daboub Henry A Singulator for document feeder
US4934684A (en) * 1988-04-05 1990-06-19 National Computer Systems, Inc. Sheet picking mechanism
US5052836A (en) * 1988-12-20 1991-10-01 Sanyo Electric Co., Ltd. Printer
US5195738A (en) * 1989-06-30 1993-03-23 National Computer Systems, Inc. Single sheet picking and transport mechanism
US5207788A (en) * 1991-04-04 1993-05-04 Cummins-Allison Corp. Feed arrangement for currency handling machines
US5333848A (en) * 1993-09-29 1994-08-02 Xerox Corporation Retard feeder
US5564689A (en) * 1993-10-28 1996-10-15 Ricoh Company, Ltd. Paper sheet separating apparatus
US5687963A (en) * 1994-11-14 1997-11-18 Cummison-Allison Corp. Method and apparatus for discriminating and counting documents
US5730439A (en) * 1996-07-15 1998-03-24 Pitney Bowes Inc. Sheet feeder
US5815592A (en) * 1990-02-05 1998-09-29 Cummins-Allison Corp. Method and apparatus for discriminating and counting documents
US6798899B2 (en) 2001-01-04 2004-09-28 Cummins-Allison Corp. Document feeding method and apparatus

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51491B1 (it) * 1966-12-31 1976-01-08
US3937453A (en) * 1974-08-02 1976-02-10 Docutel Corporation Single document transport
US3968959A (en) * 1974-12-31 1976-07-13 International Business Machines Corporation Document transport and separating device
GB2150921A (en) * 1983-12-07 1985-07-10 R Clark Dubois Automatic shoot feeding device, particularly for copiers and other machines having sheet transport mechanisms and assemblies therewith

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2762623A (en) * 1952-05-10 1956-09-11 Pitney Bowes Inc Sheet feeding device
US2813717A (en) * 1955-05-11 1957-11-19 Cummins Chicago Corp Feeding arrangement

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2762623A (en) * 1952-05-10 1956-09-11 Pitney Bowes Inc Sheet feeding device
US2813717A (en) * 1955-05-11 1957-11-19 Cummins Chicago Corp Feeding arrangement

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3272500A (en) * 1960-01-25 1966-09-13 Nederlanden Staat Device for guiding postal articles, forms or the like
US3108801A (en) * 1960-06-28 1963-10-29 Nederlanden Staat Device for conducting postal articles, forms or the like
US3295139A (en) * 1963-10-09 1966-12-27 Universal Match Corp Depository machine
US3583696A (en) * 1967-08-11 1971-06-08 Ruenzi Kurt Apparatus for feeding and removal of flat items into and from a processing machine
US3594549A (en) * 1968-06-05 1971-07-20 Scan Data Corp Document handler
US3584867A (en) * 1969-05-19 1971-06-15 Us Navy Card input hopper
US3614089A (en) * 1969-06-16 1971-10-19 Copystatics Mfg Corp Automatic original feeder for copying machine
US3788638A (en) * 1971-01-29 1974-01-29 Baeuerle Gmbh Mathias Roller arrangement, in particular for paper folding, creasing and like machines
US3754754A (en) * 1971-12-03 1973-08-28 Honeywell Inf Systems Document separator for accidental bunching
US4105199A (en) * 1975-12-22 1978-08-08 Nippon Electric Co., Ltd. Paper feeder comprising a selectively drivable resilient body in frictional contact with a feed roller
US4305525A (en) * 1978-11-18 1981-12-15 Nixdorf Computer Ag Method and arrangement for dispensing sheet material
US4420149A (en) * 1979-01-29 1983-12-13 Savin Corporation Automatic original document feeder for electrophotographic copier
DE3023893A1 (de) * 1979-06-27 1981-01-22 Savin Corp Vorrichtung zum zufuehren von blaettern, insbesondere von kopierpapierblaettern
JPS5961138U (ja) * 1982-10-15 1984-04-21 株式会社リコー 給紙装置
JPS6341382Y2 (it) * 1982-10-15 1988-10-31
US4548395A (en) * 1983-02-04 1985-10-22 Donald L. Snellman Microfiche feeder
EP0116895A3 (en) * 1983-02-16 1985-08-14 Hitachi, Ltd. Automatic sheet feeding device
US4709911A (en) * 1983-02-16 1987-12-01 Hitachi, Ltd. Automatic sheet feeding device
EP0116895A2 (en) * 1983-02-16 1984-08-29 Hitachi, Ltd. Automatic sheet feeding device
US4674735A (en) * 1983-12-07 1987-06-23 R. Clark DuBois Automatic sheet feeder for copiers and other machines having sheet transport mechanisms and assemblies therewith
US4607833A (en) * 1984-09-14 1986-08-26 Bell & Howell Company Demand document feeder
US4801134A (en) * 1986-03-04 1989-01-31 Minolta Camera Kabushiki Kaisha Paper feed apparatus capable of feeding of common use papers and specifically processed papers
US4934684A (en) * 1988-04-05 1990-06-19 National Computer Systems, Inc. Sheet picking mechanism
US4884796A (en) * 1988-05-26 1989-12-05 Daboub Henry A Singulator for document feeder
US5052836A (en) * 1988-12-20 1991-10-01 Sanyo Electric Co., Ltd. Printer
US5195738A (en) * 1989-06-30 1993-03-23 National Computer Systems, Inc. Single sheet picking and transport mechanism
US5815592A (en) * 1990-02-05 1998-09-29 Cummins-Allison Corp. Method and apparatus for discriminating and counting documents
US5207788A (en) * 1991-04-04 1993-05-04 Cummins-Allison Corp. Feed arrangement for currency handling machines
US5333848A (en) * 1993-09-29 1994-08-02 Xerox Corporation Retard feeder
US5564689A (en) * 1993-10-28 1996-10-15 Ricoh Company, Ltd. Paper sheet separating apparatus
US5687963A (en) * 1994-11-14 1997-11-18 Cummison-Allison Corp. Method and apparatus for discriminating and counting documents
US5806650A (en) * 1994-11-14 1998-09-15 Cummins-Allison Corp. Currency discriminator having a jam detection and clearing mechanism and method of clearing a jam
US5730439A (en) * 1996-07-15 1998-03-24 Pitney Bowes Inc. Sheet feeder
US6798899B2 (en) 2001-01-04 2004-09-28 Cummins-Allison Corp. Document feeding method and apparatus

Also Published As

Publication number Publication date
BE599465A (nl) 1961-05-16
GB922780A (en) 1963-04-03
CH396952A (de) 1965-08-15
NL247994A (it)

Similar Documents

Publication Publication Date Title
US3044770A (en) Sheet feeding device
CA1091706A (en) Mechanism for sequentially separating documents, sheets, coupons and the like
US3966193A (en) Mail handling stacking and feeding apparatus
US3844552A (en) Document feed device
US3754754A (en) Document separator for accidental bunching
US4569514A (en) Copy sheet decelerator for electrophotographic copier
CA1055057A (en) Semi-automatic document feeder
US3630516A (en) Sheet-feeding apparatus
US4394009A (en) Sheet feeder with buckle restraint and feed roll slippage
US4348786A (en) Opening and closing apparatus
US3627304A (en) Apparatus for handling continuous strips of material
US5971389A (en) Feeder for flat articles of varying thickness
US3737158A (en) Controlled torque document feed system
US4174102A (en) Sheet separating and feeding apparatus
CA1059541A (en) Floating gate sheet separator
US3861671A (en) Liftable bail bar for allowing return of multi-ply separated sheets to stack
US3468531A (en) Drive mechanisms
US4513959A (en) Sheet deceleration apparatus
GB829719A (en) Sheet feeding apparatus
US3083959A (en) Device for separating by means of friction two superimposed sheets of laminar material
EP0340373B1 (en) Document feeder for printing equipment
US3608894A (en) Original feeding device for photocopying machine
JPS5953334A (ja) 給紙装置
JPH0330350Y2 (it)
JPH0330351Y2 (it)