GB519181A - Driving mechanism for operating photographic contact printing machines - Google Patents
Driving mechanism for operating photographic contact printing machinesInfo
- Publication number
- GB519181A GB519181A GB2689538A GB2689538A GB519181A GB 519181 A GB519181 A GB 519181A GB 2689538 A GB2689538 A GB 2689538A GB 2689538 A GB2689538 A GB 2689538A GB 519181 A GB519181 A GB 519181A
- Authority
- GB
- United Kingdom
- Prior art keywords
- shaft
- disc
- friction disc
- drive
- friction
- 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
Links
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
- G03B27/14—Details
- G03B27/18—Maintaining or producing contact pressure between original and light-sensitive material
- G03B27/22—Maintaining or producing contact pressure between original and light-sensitive material by stretching over a curved surface
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Friction Gearing (AREA)
- Projection-Type Copiers In General (AREA)
Abstract
519,181. Photographic contact - printing apparatus. MORSE, S. H. Sept. 15, 1938, No. 26895. [Class 98 (ii)] Variable speed driving mechanism for contact-printing apparatus comprises a friction disc connected with the source of power, for example an electric motor, and a friction disc at rightangles to the first-mentioned disc engaging with its peripheral edge the plane surface of the firstmentioned disc, the second-mentioned disc being mounted upon a shaft 'transmitting through gearing the drive to the part of the apparatus to be driven, the second-mentioned disc being held against the face of the first-mentioned disc by the load applied to the shaft or shafts. As shown, the plane surface of the friction disc e mounted on the shaft d of an electric motor c is engaged by the peripheral edge of a friction disc f keyed to and slidable on the shaft g carrying a pulley t transmitting the drive through a belt a, a second pulley v, reduction gearing w, and a chain or belt to the rollers carrying the endless band or bands drawing the sensitive material and tracings round the outside of an internally illuminated glass drum. One end of a fork l engages a grooved collar n secured to the disc f and the other end is supported on a guide rod o. The centre is secured to a rod m provided at one end with a toothed rack p engaged by a pinion q on a rod r provided with a knob s, rotation of which accordingly varies the speed and alters the direction of the drive. A shaft 4 driven from the pulley 6 on the motor shaft d carries pulleys 9 driving fans mounted in the ends of the glass drum through belts. The bearing h<1> for the shaft g can move slightly by reason of the slots j and the pull of the driving belt u moves the shaft g to pull the friction disc f against the face of the friction disc a. The driving mechanism may also be applied to apparatus of the kind in which both the band and the glass drum are rotated. A second friction drive on a doubleshafted motor may be provided for twin contact-printing machines.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2689538A GB519181A (en) | 1938-09-15 | 1938-09-15 | Driving mechanism for operating photographic contact printing machines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2689538A GB519181A (en) | 1938-09-15 | 1938-09-15 | Driving mechanism for operating photographic contact printing machines |
Publications (1)
Publication Number | Publication Date |
---|---|
GB519181A true GB519181A (en) | 1940-03-19 |
Family
ID=10250887
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2689538A Expired GB519181A (en) | 1938-09-15 | 1938-09-15 | Driving mechanism for operating photographic contact printing machines |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB519181A (en) |
-
1938
- 1938-09-15 GB GB2689538A patent/GB519181A/en not_active Expired
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