US3658418A - Printer multi-belt tension control - Google Patents

Printer multi-belt tension control Download PDF

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Publication number
US3658418A
US3658418A US889525A US3658418DA US3658418A US 3658418 A US3658418 A US 3658418A US 889525 A US889525 A US 889525A US 3658418D A US3658418D A US 3658418DA US 3658418 A US3658418 A US 3658418A
Authority
US
United States
Prior art keywords
drive roller
belts
cylinder
main drive
auxiliary
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
US889525A
Other languages
English (en)
Inventor
Emilio G Mastroianni
Robert C Goodman
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.)
R Q O HOLDING CO Inc
Original Assignee
GAF 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 GAF Corp filed Critical GAF Corp
Application granted granted Critical
Publication of US3658418A publication Critical patent/US3658418A/en
Assigned to R Q O HOLDING COMPANY INC reassignment R Q O HOLDING COMPANY INC ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GAF CORPORATION
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
    • 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
    • G03B27/14—Details

Definitions

  • auxiliary drive roller which draws the belts from the cylinder by rotating at a speed slightly higher than that of the main drive roller.
  • the outer surface of the auxiliary drive roller also has a coefi'lcient of friction that is less than that of the main drive roller, so that the auxiliary drive roller continuously slips against the printer belt, but at the same time pulls and evens out the looped belts over the critical printing area of the cylinder.
  • This invention relates to photo-copy machines, and more particularly to printer multi-belt tension control of a plurality of belts for conveying master and copy materials around the rotating glass cylinder of a printer.
  • the main object of this invention is to provide a printer multi-belt tension control .which overcomes such problems by novel means providing a controlled uniform and minimum amount of tension in the critical printing area.
  • Another object of the invention is to provide a novel multibelt driving system which resolves such drawbacks of the prior art, thereby providing smooth and clear images in the prints produced .by the machine, and increasing the efficiency thereof.
  • a further object is to provide a multiple belt drive for copying machines that is simple, inexpensive and efiective, especially in the critical printing area thereof.
  • auxiliary booster (pulling) drive roller which is located above the glass cylinder about which the belts are driven by the main (pushing) drive roller which is located in front of the cylinder.
  • the auxiliary drive roller is driven at a speed slightly greater than that of the main drive roller.
  • the anti drive surface of the auxiliary drive roller also is provided with a smooth finish having a coefficient of friction which is less than that of the main drive roller.
  • the auxiliary drive roller slips continuously against the printer belt, but at the same time pulls and evens out the looped belts at the printing cylinder area. Having each belt drawn around the cylinder with the same tension, results in images of uniform density and with no blurring. At the same time, undesirable belt tension is reduced.
  • FIGURE is a view mainly in side elevation of a belt tension control system illustrative of the invention.
  • a main drive roller 1 is rotated in a counter-clockwise direction to advance a plurality of belts 2 toward and about a glass printing cylinder 3. Without the present invention this alone results in undesirable tensions in the critical exposure area, due to the (exaggerated) slackness at 4 in the adjacent side of the belts 2.
  • Such problem is solved according to the invention by incorporating a novel auxiliary or booster (slip-pull) drive roller 5 in the system, located above the cylinder 3.
  • the auxiliary drive roller 5 is over-driven by means 6 having a speed slightly faster than that of the main drive roller 1 by its drive means 7.
  • the surface 8 of the roller 5 in contact with the printer belt 2a is smooth and provided with a coefficient of friction which is less than that of the surface 9 of the roller 1.
  • the speed of the over-driven slip-drive roller is accurately set so that the auxiliary roller surface 8 slips continuously against the surface of the printer belt 20 and thereby uniformly pulls and tensions the belts 2 on the critical printing area 10 of the glass cylinder 3 with a finely controlled minimum amount of tension thereby gently taking up all of the unwanted slack at 4.
  • the belts 2 convey master and copy materials M and C (note: put in correct sition with respect to belts) as film, webs or shuts, first un er the glass cylinder 3, through the exposure zone 10, than upwardly toward the auxiliary drive roller 5 which is picked-off by pick-off fingers 11.
  • the belts 2 then pass downwardly over idler-roller 12, under tensionroller 13, over nip-roller l4, and finally around main drive roller 1.
  • the roller 13 is adjustable so that the belt tensions can be finely adjusted and reduced up to percent of the tension heretofore require with prior conventional single drive roller systems.
  • This feature has the big advantage of eliminating possible wadding or buckling of the prints C.
  • Another advantage of the auxiliary drive roller 5 is that far less power is required to drive the printer section 15 of the copy machine by virtue of the lower belt tension provided by the invention.
  • glass as applied to the printing cylinder, include all suitable transparent materials including plastics.
  • An improved apparatus for driving multiple belts which convey master and copy materials around the exposure zone of a rotating glass printing cylinder in a white-print duplicating machine including a main drive roller located beyond said printing cylinder and toward which the belts are advanced by said main drive roller; the improvement comprising an auxiliary booster drive roller located beyond said printing cylinder having a surface with a coefficient of friction less than that of said main drive roller, and

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Projection-Type Copiers In General (AREA)
US889525A 1969-12-31 1969-12-31 Printer multi-belt tension control Expired - Lifetime US3658418A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US88952569A 1969-12-31 1969-12-31

Publications (1)

Publication Number Publication Date
US3658418A true US3658418A (en) 1972-04-25

Family

ID=25395283

Family Applications (1)

Application Number Title Priority Date Filing Date
US889525A Expired - Lifetime US3658418A (en) 1969-12-31 1969-12-31 Printer multi-belt tension control

Country Status (8)

Country Link
US (1) US3658418A (xx)
CA (1) CA924949A (xx)
CH (1) CH516175A (xx)
DE (2) DE2063667B2 (xx)
GB (1) GB1310446A (xx)
NL (1) NL7018976A (xx)
SE (1) SE357628B (xx)
ZA (1) ZA708714B (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3749491A (en) * 1972-02-07 1973-07-31 Stromberg Datagraphix Inc Microfiche duplicator
US3811772A (en) * 1972-03-03 1974-05-21 Canon Kk Film reproduction device
FR2466036A1 (fr) * 1979-09-26 1981-03-27 Hansa Technik Gmbh Appareil a photo-calquer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324292A (en) * 1964-10-26 1967-06-06 Robert B Russell Thermographic copying machine with a series of driven rollers to separate the copy and transfer sheets
US3432236A (en) * 1965-07-23 1969-03-11 Grinten Chem L V D Photoprinting apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324292A (en) * 1964-10-26 1967-06-06 Robert B Russell Thermographic copying machine with a series of driven rollers to separate the copy and transfer sheets
US3432236A (en) * 1965-07-23 1969-03-11 Grinten Chem L V D Photoprinting apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3749491A (en) * 1972-02-07 1973-07-31 Stromberg Datagraphix Inc Microfiche duplicator
US3811772A (en) * 1972-03-03 1974-05-21 Canon Kk Film reproduction device
FR2466036A1 (fr) * 1979-09-26 1981-03-27 Hansa Technik Gmbh Appareil a photo-calquer

Also Published As

Publication number Publication date
ZA708714B (en) 1971-11-24
DE2063667B2 (de) 1976-12-30
SE357628B (xx) 1973-07-02
DE7047591U (de) 1971-04-01
NL7018976A (xx) 1971-07-02
GB1310446A (en) 1973-03-21
CA924949A (en) 1973-04-24
DE2063667A1 (de) 1971-07-08
CH516175A (de) 1971-11-30

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Legal Events

Date Code Title Description
AS Assignment

Owner name: R Q O HOLDING COMPANY INC, NEW YORK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GAF CORPORATION;REEL/FRAME:004006/0585

Effective date: 19820526

Owner name: R Q O HOLDING COMPANY INC 111 WEST 2ND ST JAMESTOW

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GAF CORPORATION;REEL/FRAME:004006/0585

Effective date: 19820526