US3658418A - Printer multi-belt tension control - Google Patents
Printer multi-belt tension control Download PDFInfo
- 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
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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
Abstract
Master and copy materials are conveyed around the rotating glass cylinder of a printer in the exposure section of a whiteprint duplicating machine, by multiple belts which are driven by a main printer drive roller which advances the belts toward such glass cylinder, and an auxiliary booster 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 coefficient 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.
Description
United States Patent Mastroianni et al.
PRINTER MULTI-BELT TENSION CONTROL Inventors: Emilio G. Mastroianni, Endicott, N.Y.;
Robert C. Goodman, St. Croix, V.l.
GAF Corporation, New York, N.Y.
Dec. 31, 1969 Int. Cl. ..G03b 27/10 Field of Search ....355/l04, 1 l0 Relerences'Cited UNITED STATES PATENTS 6/1967 Russelletal ..355/110X 3/1969 Vercoulen ..355/110X revs/01v Ila, 40,1 0. MEANS OVER-DRIVEN SLIP-PULL DRIVE ROLLER [451 Apr. 25, 1972 Primary Examiner-Samuel S. Matthews Assistant Examiner-E. M. Bero ABSTRACT Master and copy materials are conveyed around the rotating glass cylinder of a printer in the exposure section of a whiteprint duplicating machine. by multiple belts which are driven by a main printer drive roller which advances the belts toward such glass cylinder, and an auxiliary booster 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.
2 Claims, 1 Drawing Figure SPEED 62,, 40.1'0. MEANS a, I
DRIVE MEANS 6' MAIN DRIVE ROLLER 09/1 5 MEANS PATENTEDAPRZSISYZ 3658.418
TENS/0N 77 ADJ'D. SPEED MEANS 6' ADJ'D. MEA /vs ovmo/e/vs/v sL/P- PULL 5 DRIVE ROLLER my; MEANS lav/7m ATTORNEY PRINTER MULTI-BELT TENSION CONTROL 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.
In the past the multiple belts were driven by a single drive roller located just ahead of the printing cylinder, resulting in the slack side of the belts being located at or adjacent to the critical exposure zone of printing cylinder. Belt matching tolerances and inconsistent properties of the individual belts caused them to have varying tensions, which resulted in uneven and variable contact pressure between the master and print copy at the printing area adjacent such slack side of the belts.
The main object of this invention, therefore, 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.
Also, in the prior art, another disadvantage of the single drive roller system of driving multiple belts around the glass printing cylinder, was that the belts required a great deal of tension to keep them from stalling. Such high tension also caused buckling of the materials being processed, resulting in blurred images, and physical wadding" of the prints.
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.
According to the invention such objects are accomplished by the provision of an 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.
Therefore, 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.
In the drawing, the single FIGURE is a view mainly in side elevation of a belt tension control system illustrative of the invention.
As shown in the drawing, 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. Also 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.
Thus, in operation, 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.
As used herein the term "glass" as applied to the printing cylinder, include all suitable transparent materials including plastics.
What is claimed is:
1. 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
means for driving said auxiliary booster roller at a speed greater than that of said main drive roller for continuously taking up any undesirable slack tending to form in the belts as they move on said cylinder through said exposure zone.
2. The invention as defined by claim 1, in which the speed of rotation of said auxiliary drive roller is only slightly greater than that of the main drive roller,
whereby the belts are continuously lightly tensioned as they move the master and copy materials over the critical printing area of the rotating glass cylinder.
i t 1 i
Claims (2)
1. 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 means for driving said auxiliary booster roller at a speed greater than that of said main drive roller for continuously taking up any undesirable slack tending to form in the belts as they move on said cylinder through said exposure zone.
2. The invention as defined by claim 1, in which the speed of rotation of said auxiliary drive roller is only slightly greater than that of the main drive roller, whereby the belts are continuously lightly tensioned as they move the master and copy materials over the critical printing area of the rotating glass cylinder.
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 (en) |
CA (1) | CA924949A (en) |
CH (1) | CH516175A (en) |
DE (2) | DE2063667B2 (en) |
GB (1) | GB1310446A (en) |
NL (1) | NL7018976A (en) |
SE (1) | SE357628B (en) |
ZA (1) | ZA708714B (en) |
Cited By (3)
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 (en) * | 1979-09-26 | 1981-03-27 | Hansa Technik Gmbh | PHOTO-CALCING APPARATUS |
Citations (2)
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 |
-
1969
- 1969-12-31 US US889525A patent/US3658418A/en not_active Expired - Lifetime
-
1970
- 1970-12-21 GB GB6067070A patent/GB1310446A/en not_active Expired
- 1970-12-24 DE DE19702063667 patent/DE2063667B2/en not_active Withdrawn
- 1970-12-24 DE DE19707047591U patent/DE7047591U/en not_active Expired
- 1970-12-28 CH CH1918970A patent/CH516175A/en not_active IP Right Cessation
- 1970-12-29 ZA ZA708714A patent/ZA708714B/en unknown
- 1970-12-29 NL NL7018976A patent/NL7018976A/xx unknown
- 1970-12-30 CA CA101697A patent/CA924949A/en not_active Expired
- 1970-12-30 SE SE17789/70A patent/SE357628B/xx unknown
Patent Citations (2)
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)
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 (en) * | 1979-09-26 | 1981-03-27 | Hansa Technik Gmbh | PHOTO-CALCING APPARATUS |
Also Published As
Publication number | Publication date |
---|---|
SE357628B (en) | 1973-07-02 |
NL7018976A (en) | 1971-07-02 |
DE2063667A1 (en) | 1971-07-08 |
GB1310446A (en) | 1973-03-21 |
CA924949A (en) | 1973-04-24 |
CH516175A (en) | 1971-11-30 |
DE2063667B2 (en) | 1976-12-30 |
ZA708714B (en) | 1971-11-24 |
DE7047591U (en) | 1971-04-01 |
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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 |