US3432236A - Photoprinting apparatus - Google Patents

Photoprinting apparatus Download PDF

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Publication number
US3432236A
US3432236A US566801A US3432236DA US3432236A US 3432236 A US3432236 A US 3432236A US 566801 A US566801 A US 566801A US 3432236D A US3432236D A US 3432236DA US 3432236 A US3432236 A US 3432236A
Authority
US
United States
Prior art keywords
cylinder
original
belts
clamping device
roller
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
US566801A
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English (en)
Inventor
Johannes Cornelis Au Vercoulen
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 US3432236A publication Critical patent/US3432236A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/02—Exposure apparatus for contact printing
    • G03B27/10—Copying apparatus with a relative movement between the original and the light source during exposure
    • G03B27/12—Copying apparatus with a relative movement between the original and the light source during exposure for automatic repeated copying of the same original

Definitions

  • the invention relates to photoprinting by the use of apparatus of the type which comprises a rotatably driven exposure cylinder which is provided With a clamping device for holding the leading edge of an original to be copied and a driven belt system for pressing the nonheld part of the original together with a sheet of light-sensitive material against the wall of the cylinder during exposure.
  • Apparatuses of this type generally function in a satisfactory manner when the original is copied once or only a few times.
  • the exposure cylinder is driven through contact With the belt system, if necessary via the original and the light-sensitive material situated in between, and thus with the same circumferential velocity as the belt system.
  • the velocity with which the belt system is driven is somewhat higher than the velocity with which the cylinder is driven.
  • the velocity of movement of the belt system is 0.5-3% higher than the velocity of movement of the cylinder.
  • 1 is the glass exposure cylinder of the apparatus, which is supported at its ends in a conventional manner in end plates so as to be freely rotatable.
  • a tubular copying lamp 2, as well as a screen 3, which prevents undesirable radiation of light towards the operating side of the apparatus, are stationarily mounted inside the cylinder.
  • rollers 5, 6, 7, which serve to guide and stretch the belts.
  • At least one of these rollers, e.g., roller 7, is provided with disks 9, which extend between the belts 4 and which serve to guide the belts and to form slit-shaped interspaces between the belts.
  • the parts 2 and 3 and the rollers 5 to 8 are also supported in the said end plates in a usual manner.
  • a clamping device which serves to hold the leading edge of an original to be copied, is attached to the cylinder 1.
  • This clamping device comprises a shaft 10, which is rotatatbly supported in bearings (not shown) which are carried by the cylinder and to which are attached a number of mutually spaced clamps 11 and ejecting pins 12, which extend through openings in the cylinder wall.
  • the members 11 and 12 respectively are at the same time situated in the region of the slit-shaped spaces between the belts 4, and they are dimensioned in such a way that they are able to extend through these spaces.
  • the clamping device In a conventional manner the clamping device is normally kept closed with the aid of springs (not shown), which tend to press the clamps 11 against the wall of the cylinder 1.
  • springs not shown
  • the clamping device can be opened at the desired moments by turning the shaft 10 contrary to the action of the said springs.
  • the apparatus is further provided with a device, known per se, for feeding originals, which consists of guide plates 13 and 14 respectively, a rotatably supported shaft 15, to which stops 16 and a continuously rotating transport roller 17 are connected.
  • a device known per se, for feeding originals, which consists of guide plates 13 and 14 respectively, a rotatably supported shaft 15, to which stops 16 and a continuously rotating transport roller 17 are connected.
  • An original to be copied O is placed between the plates 13 and 14 in such a way that its leading edge rests against the stops.
  • the shaft 15 is turned, the stops 16 swing away, while at the same time the rotating transport roller 17 seizes the original and sets it in motion.
  • the apparatus is now controlled in such clamping device of cylinder 1, which at that moment, in the opened position, moves past the original-feeding mechanism, and that afterwards the clamping device is closed and the original starts rotating along with the cylinder.
  • the apparatus comprises a conventional device for feeding sheets of light-sensitive material, which device consists of guide plates 18 and 19 respectively, a rotatably supported shaft 20, stops 21, and a rotating transport roller 22.
  • This device is controlled in the same way as mentioned hereinbefore with regard to the original-feeding mechanism, so that with each revolution of cylinder 1 a light-sensitive copy sheet K is put on the original 0 between cylinder 1 and belts 4, with a view to making a copy.
  • the copy sheet After the exposure the copy sheet is sucked against the belts 4 by means of a suction 'box 23, so that it is detached from the cylinder and via a guiding plate 24 is guided away, e.g., to the developing unit of the apparatus.
  • the clamping device When the desired number of copies of an original has thus been made, the clamping device is opened.
  • the clamps 11 release the edge of the original, while the ejecting pins 12 separate the edge of the original from the cylinder wall and guide it over a guiding plate 25, along which the original is afterwards guided away, e.g., to a receiving trough.
  • the belts 4 are driven by the driving roller 8, which is a way that the leading edge of the original gets into the coupled to the driving motor (not shown) of the apparatus.
  • This motor is positioned at the outside of the apparatus, i.e., outside one of the end plates.
  • cylinder 1 is provided with a pulley unit, over which a belt 26 is guided, which is tensioned over a tension roller 27 and extends over a driving roller 28.
  • a gear wheel 29 mounted on the roller 28 is a gear wheel 29, which co-operates with a .gear wheel mounted on the roller 8, and via these gear wheels, the roller 28, and the belt 2-6, the cylinder 1 is also coupled to the driving motor of the apparatus.
  • the diameters of therollers 8 and 28 respectively and the number of teeth of the gear wheels 29 and 30 respectively are so chosen that the required difference between the velocities with which the cylinder 1 and the belts 4 are driven is set up.
  • the desired difference can of course be obtained in various ways.
  • the driving rollers 8 and 28 respectively may have the same diameter and the gear wheels 29 and 30 respectively may have different numbers of teeth, the gear wheel 30 having slightly fewer teeth than the gear wheel 29.
  • gear wheel 30 may have fifty-nine teeth and gear wheel 29 sixty.
  • the two gear wheels may also be equally large and the diameter of roller 8 be somewhat larger than that of roller 28.
  • the diameter of the roller 8 is 0.5-3% larger than that of the roller 28 if the gear wheels 29 and 30 have the same number of teeth, and anyhow the diameters of rollers 8 and 28 and the numbers of teeth of gear wheels 29 and 30 are chosen so that the linear speed of the belt-s 4 is 0.5 to 3% higher than the peripheral speed of glass cylinder 1.
  • a very convenient form of the apparatus is obtained when a conventional rope pulley with a variable diameter is used for the roller 28. In such an embodiment it is very easy to realize the desired difference in velocity.
  • Photoprinting apparatus comprising a rotatably driven exposure cylinder, which is provided with a clamping device for holding the leading edge of a sheet original to be copied and a driven belt system for pressing the nonheld part of the original together with sheet lightsensitive material against the wall of the cylinder during exposure, and means for driving the belt system at a speed slightly higher than the speed of the cylinder.
  • Apparatus according to claim 1 said cylinder being driven by a nonslipping belt drive comprising a driven rotary pulley, said driving means comprising a rotary member engaging the belts of said belt system and means coupling said member with said pulley for rotation therewith at a relative speed advancing said belts slightly faster than said cylinder surface.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Photographic Developing Apparatuses (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
US566801A 1965-07-23 1966-07-21 Photoprinting apparatus Expired - Lifetime US3432236A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6509596A NL6509596A (enrdf_load_stackoverflow) 1965-07-23 1965-07-23

Publications (1)

Publication Number Publication Date
US3432236A true US3432236A (en) 1969-03-11

Family

ID=19793723

Family Applications (1)

Application Number Title Priority Date Filing Date
US566801A Expired - Lifetime US3432236A (en) 1965-07-23 1966-07-21 Photoprinting apparatus

Country Status (5)

Country Link
US (1) US3432236A (enrdf_load_stackoverflow)
CH (1) CH439966A (enrdf_load_stackoverflow)
DE (1) DE1982244U (enrdf_load_stackoverflow)
GB (1) GB1093015A (enrdf_load_stackoverflow)
NL (1) NL6509596A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3578861A (en) * 1967-08-31 1971-05-18 Ricoh Kk Copy paper feeding device for use with photocopying machine
US3658418A (en) * 1969-12-31 1972-04-25 Gaf Corp Printer multi-belt tension control
US3813163A (en) * 1971-11-17 1974-05-28 Ricoh Kk Copying machine of the penetration printing type

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2048754A (en) * 1932-08-31 1936-07-28 Charles P Putnam Web processing machine
US2297573A (en) * 1940-10-17 1942-09-29 Bruning Charles Co Inc Cylinder drive mechanism for printing machines
US3033095A (en) * 1958-04-05 1962-05-08 Zindler Lumoprint Kg Apparatus for making copies
US3199864A (en) * 1963-02-21 1965-08-10 Pitney Bowes Inc Document handling apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2048754A (en) * 1932-08-31 1936-07-28 Charles P Putnam Web processing machine
US2297573A (en) * 1940-10-17 1942-09-29 Bruning Charles Co Inc Cylinder drive mechanism for printing machines
US3033095A (en) * 1958-04-05 1962-05-08 Zindler Lumoprint Kg Apparatus for making copies
US3199864A (en) * 1963-02-21 1965-08-10 Pitney Bowes Inc Document handling apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3578861A (en) * 1967-08-31 1971-05-18 Ricoh Kk Copy paper feeding device for use with photocopying machine
US3658418A (en) * 1969-12-31 1972-04-25 Gaf Corp Printer multi-belt tension control
US3813163A (en) * 1971-11-17 1974-05-28 Ricoh Kk Copying machine of the penetration printing type

Also Published As

Publication number Publication date
GB1093015A (en) 1967-11-29
CH439966A (de) 1967-07-15
NL6509596A (enrdf_load_stackoverflow) 1967-01-24
DE1982244U (de) 1968-03-28

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