US3584861A - Clamping device - Google Patents

Clamping device Download PDF

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Publication number
US3584861A
US3584861A US809363A US3584861DA US3584861A US 3584861 A US3584861 A US 3584861A US 809363 A US809363 A US 809363A US 3584861D A US3584861D A US 3584861DA US 3584861 A US3584861 A US 3584861A
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US
United States
Prior art keywords
platen
arms
clamping
slots
receiver
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
US809363A
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English (en)
Inventor
William A Macdonald Jr
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Application granted granted Critical
Publication of US3584861A publication Critical patent/US3584861A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6502—Supplying of sheet copy material; Cassettes therefor

Definitions

  • the invention relates to a clamping device, andmore particularly a clamping device for securing one of twomembers which are electrostatically held together while the other member is stripped therefrom.
  • the present invention is adapted for use in an electrophotographic device, such as that disclosed in my commonly assigned copending U.S. application Ser. No. 665,915, filed Sept. 6, 1967 and now abandoned.
  • a receiver in the form of a web having a nonconductive surface and a conductive backing is fed from a roll onto a conductive platen and cut to appropriate lengths to form receiver sheets.
  • a flexible photoconductor having a conductive backing is lowered onto a receiver sheet on the platen and a potential applied between the platen and the conductive backing of the photoconductor. If the photoconductor is exposed to a pattern of radiation at the same time, an electrostatic image will be left on the receiver. After exposure, the flexible photoconductor is raised, thereby stripping it from the receiver sheet.
  • clamp means are provided which are actuated as the photoconductor is raised to grip the side edges of the receiver sheet and hold it taut and flat as the photoconductor is pulled away. Subsequently, the clamps are released and the cut receiver sheet is fed through a suitable developing station where the electrostatic image thereon is toned and through the fusing station to fix the image thereon.
  • the receiver may be coated with a photoconductive material.
  • the member which is lowered and raised is merely a flexible electrode. In either case, there is an electrostatic attraction between the receiver and the other member tending to pull the receiver away from the platen when the members are separated.
  • the clamping means may include paper guides which receive the edges of the sheet and have spaced slots therein through which clam'ps may be moved downwardly upon actuation of a clamping bar to clamp the receiver to the platen.
  • the clamping bar is moved upon energization ofa solenoid.
  • the solenoid is deenergized permitting the clamps to be spring urged back to their initial position so that the receiver sheet may be fed through the paper guides to a toning station.
  • the clamps pivot so that they tend to stretch the receiver tight across the platen.
  • FIG. I is a perspective view of the clamping device of this invention, with parts broken away for clarity of illustration;
  • FIG. 2 is a transverse section, on an enlarged scale, taken along line 2-2 of FIG. 1.
  • a platen I0 for supporting a receiver extends between spaced sidewalls 11 and 12 of a frame F which are interconnected by a bottom wall 13.
  • the platen is conductive and may be suitably insulated from sidewalls 1] and 12 by means not shown.
  • a length of material, such as a receiver sheet 14, which conveniently may include a conductive backing and an insulating layer, may be fed from a roll (not shown) under longitudinal extending paper guides l5 and 15' which include flange portions 16 and 16, respectively, extending over the lateral edges of the receiver, as shown.
  • a flexible photoconductive member (not shown) can be lowered onto the receiver.
  • a drive motor 40 which rotates a shaft 41 by means of pulley 42 to raise and lower photoconductor support arms 43 by means of excentrics 44.
  • One end of the photoconductor is attached to supports 43 of FIG. 1, but best seen in my above-mentioned copending application.
  • the other end of the photoconductor is connected to photoconductor support arm 45 which is pivotally connected to one end of a link 46 whose opposite end is pivoted to sidewall 11.
  • a cam follower such as roller 47 which rides on cam 48.
  • Cam 48 is rotatably driven by motor 40 through pulley 49 to raise and lower support arm 45.
  • a potential may be applied between platen l0 and a conductive backing on the photoconductor to place an electrostatic charge on the insulating surface of receiver 14.
  • the photoconductor may be exposed through its back surface so as to dissipate the charge and exposed areas on receiver 14 leaving an electrostatic image. After exposure the potential is discontinued and the photoconductor is raised from receiver 14 upon energization of motor 40.
  • Each clamping device Prior to raising the photoconductor, however, clamping devices D and D are actuated to clamp the receiver so that it will not be pulled out of paper guides 15 and 15'.
  • Each clamping device includes a longitudinal channel having a bottom wall 17 and 17 respectively, interconnecting short upstanding walls 18 and 18 with longer upstanding walls 19 and 19', respectively. Bottom walls 17 and 17 are attached, respectively, to guide 15 and 15.
  • Clamping arms 21 and 21 extend through slots 22 and 22 respectively in short legs 18 and 18 and through slots 23 and 23 respectively in long legs 19 and 19.
  • slot 22 is relatively narrow and serves as a pivot-for clamping arm 21 whereas slot 23 is relatively long to permit pivotal movement of clamping arm 21.
  • Slots 22 and 23' are similarly constructed.
  • Each clamping arm is provided with a pressure pad such as pressure pad 24 adapted to moved downwardly through a slot such as slot 25 in flange 16 of paper guide 15 and into engagement with receiver I4, as described below.
  • the opposite end of each clamping arm 21 is connected to a spring 26 which extends between the clamping arm and paper guide 15', as shown.
  • a pressure link such as pressure link 27 extends along the outer side of leg 19, one end thereof being pivoted to a support or arm 28 which in turn is pivoted to leg 19.
  • the other end link 28 is pivoted intermediate the ends of an arm 29 whose upper end is pivoted to leg 19.
  • Spaced along link 27 above each clamping arm 21 is a pressure pad 31 adapted to engage and pivot pressure arms 21 about slots 22 against the force of spring 26, as described below.
  • Arms 29 and 29' are pivotally connected at their lower ends to yokes 32 and 32', respectively, which in turn are fixedly attached to a pivotal rod 33 extending between and journaled in sidewalls 11 and 12.
  • An outwardly extending end of rod 33 is connected to a lever 34 which in turn is connected to arm 35 of solenoid 36.
  • clamping arms to pivot about slot 22 against the force of springs 26 so that clamping pads 24 moved downwardly through slots 25 into engagement with the side edges of receiver 14.
  • the clamping pads 24 moved downwardly they will also move outwardly slightly due to their pivotal movement about slot 22. This tends to stretch the receiver 14 in a lateral direction so that it is held taut and cannot be raised by the electrostatic attraction between the receiver and the photoconductor.
  • solenoid 36 When solenoid 36 is deenergized, spring 37, encircling arm 35, will cause rod 33 to be rotated in a counterclockwise direction thereby raising the pressure links.
  • the clamping arms, such as clamping arms 21 will be pivoted back to their initial positions under the influence of springs 26.
  • cam 48 When motor 40 is energized to raise the photoconductor, cam 48 will be rotated in a clockwise direction through the position shown in FIG. 1 so that the leading end of cam 48 closes switch 50 in the circuit to solenoid 36. As cam 48 continues to rotate, cam follower 47 will be raised to raise the photoconductor. While the photoconductor is in the fully raised position, the trailing end of cam 48 will pass the switch just before motor 40 is deenergized. This will cause switch 50 to be opened and solenoid 36 to be deenergized.
  • the member whichis raised and lowered may be a flexible conductive electrode.
  • a means has been provided wherein a receiver sheet may be firmly clamped to a platen while a flexible member is separated therefrom after charging so that the electrostatic attraction between the two will not cause the receiver to be pulled out of its guides.
  • a series of pressure pads space along the longitudinal edges of the receiver are adapted to pivot through an arc so as to grip the edges of the receiver and pull it taut.
  • An apparatus for clamping lateral edges of a length of material comprising:
  • a platen having side edges, for supporting said length of material fed from a first end of said platen toward a second end thereof;
  • each clamping means being movable from a first position spaced from said side edges to a second position in engagement with said platen to clamp the lateral edges of said length ofmaterial to said platen;
  • each said guide means having means defining at least one opening through which each of said clamping means is movable from said first position to said second position.
  • An apparatus for clamping lateral edges of a cut sheet comprising:
  • a platen having side edges, for supporting said cut sheet fed from a first end of said platen toward a second end thereof;
  • each guide having means defining a plurality of slots
  • a plurality of clamping arms mounted adjacent each side edge of said platen for pivotal movement from a first position spaced from said side edges to a second position in engagement with said platen a foot on each of said clamping arms, each movable through one of said slots upon movement of said arms from said first position to said second position to clamp the lateral edges of said sheet against said platen;
  • a receiver sheet clamping apparatus comprising:
  • a platen having side edges, for supporting a receiver sheet having lateral edges, fed from a first end of said platen toward a second end thereof;
  • each guide having means defining a plurality of slots
  • clamping arms having feet thereon, said clamping arms being pivotally mounted on each of said support means for movement from a first position wherein said feet are spaced from said platen to a second position wherein said feet move through said slots into engagement with said platen to grip said lateral edges of said receiver sheet therebetween;
  • actuatable moving means connected to said linkage means for moving said pressure links into engagement with said clamping arms to moved said clamping arms from said first position to said second position.
  • said support means comprising:
  • linkage means includes:
  • said moving means includes:
  • a solenoid connected to said second end of said lever for rotating said rod upon actuation of said solenoid to move said pressure links into engagement with said clamping arms.
  • An apparatus for clamping lateral edges of a cut sheet comprising:
  • a platen having side edges, for supporting said cut sheet fed from a first end of said platen toward a second end thereof;
  • a plurality of clamping arms mounted adjacent each side edge of said platen for pivotal movement from a first posi-

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Handling Of Cut Paper (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
US809363A 1969-03-21 1969-03-21 Clamping device Expired - Lifetime US3584861A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US80936369A 1969-03-21 1969-03-21

Publications (1)

Publication Number Publication Date
US3584861A true US3584861A (en) 1971-06-15

Family

ID=25201153

Family Applications (1)

Application Number Title Priority Date Filing Date
US809363A Expired - Lifetime US3584861A (en) 1969-03-21 1969-03-21 Clamping device

Country Status (4)

Country Link
US (1) US3584861A (enrdf_load_stackoverflow)
DE (1) DE2013852A1 (enrdf_load_stackoverflow)
FR (1) FR2039683A5 (enrdf_load_stackoverflow)
GB (1) GB1308000A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990004217A1 (en) * 1988-10-04 1990-04-19 Spectrum Sciences B.V. Imaging apparatus
US4945387A (en) * 1988-10-04 1990-07-31 Spectrum Sciences B.V. Image transfer apparatus and method using tension transfer member
US20090146355A1 (en) * 2007-12-10 2009-06-11 Universal Instruments Corporation Flexible substrate tensioner

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1158686A (en) * 1914-05-09 1915-11-02 Earl W Henning Cloth-measuring machine.
US1798240A (en) * 1927-02-19 1931-03-31 Welter Nicolaus Sheet-applying apparatus for printing presses
US2167823A (en) * 1936-08-25 1939-08-01 Backhouse Headley Townsend Sheet feeding machine
US2685927A (en) * 1951-01-11 1954-08-10 Harry B Fechter Flange and/or hole cutting machine for sheet material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1158686A (en) * 1914-05-09 1915-11-02 Earl W Henning Cloth-measuring machine.
US1798240A (en) * 1927-02-19 1931-03-31 Welter Nicolaus Sheet-applying apparatus for printing presses
US2167823A (en) * 1936-08-25 1939-08-01 Backhouse Headley Townsend Sheet feeding machine
US2685927A (en) * 1951-01-11 1954-08-10 Harry B Fechter Flange and/or hole cutting machine for sheet material

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990004217A1 (en) * 1988-10-04 1990-04-19 Spectrum Sciences B.V. Imaging apparatus
US4945387A (en) * 1988-10-04 1990-07-31 Spectrum Sciences B.V. Image transfer apparatus and method using tension transfer member
US20090146355A1 (en) * 2007-12-10 2009-06-11 Universal Instruments Corporation Flexible substrate tensioner
WO2009076045A1 (en) 2007-12-10 2009-06-18 Universal Instruments Corporation Flexible substrate tensioner
US8490271B2 (en) * 2007-12-10 2013-07-23 Universal Instruments Corporation Flexible substrate tensioner

Also Published As

Publication number Publication date
GB1308000A (enrdf_load_stackoverflow) 1973-02-21
FR2039683A5 (enrdf_load_stackoverflow) 1971-01-15
DE2013852A1 (de) 1970-10-08

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