Patent GB-657319-A (GB)
Title: Improvements in or relating to photographic copying apparatus
IPC: G03B27/62
Filed: 1948-07-21
Abstract: 657,319. Photographic copying apparatus. KODAK, Ltd. July 21, 1948, No. 19576. Convention date, July 21, 1947. Addition to 648,296. [Class 98 (i)] The photographic copying apparatus combined with a printing assembly claimed in the parent Specification is modified in that the numbering unit is keyed to a shaft clutched to rollers in frictional engagement with the feed drum when the tripping means is actuated by the leading edge of a document, such rollers constituting the driving members of clutch means, the driven members of which are circular plates having peripheral wedge-shaped recesses accommodating rollers and also lateral pins projecting from locking discs that are normally clutched to the shaft by a second clutch means, and in that the numbering unit shaft is axially movable against the action of a spring to uncouple the second clutch means so that the shaft and numbering unit may be rotated manually relative to the remainder of the printing assembly. As in the parent Specification, the printing assembly is mounted between end plates, and supported between the sides of the copying apparatus adjacent the feed drum 1. As shown, Fig. 2, the document 2 to be copied is fed under a pressure plate 56 between the drum and the numbering unit, which makes one revolution only to print a number on the document before it is fed to the copying position, the number being changed sequentially at each revolution. The numbering unit is mounted on a shaft 104, Fig. 4, passing through the end plates 3 and 4 and the wall 112 of the copying apparatus. Shaft 104 bears splined bosses 101, 101a and a pair of knobs 118, 119 on the end projecting outside the wall 112. Knob 119 is slidable on a square portion of the shaft 104 and knob 118 is screwed to the end thereof, and is slidable over the knob 119. The shaft 104 is normally urged to the right in Fig. 4 by a compression spring 121a between the knobs 118, 119 and by a compression spring 109 between the boss 101a and a cap 110 bolted to the end plate 4. The splined bosses 101, 101a are urged by the springs into correspondingly grooved recesses in circular extensions of discs 108 journalled in the end plates 3, 4 through which the shaft 104 passes freely. Shaft 104 is then keyed to the discs 108, but is freed therefrom when shaft 104 is urged to the left by pressing knob 118. Dicsc 24, 25 are also freely mounted on shaft 104, and have recesses into which fit clutch plates 127. Plates 127 have notches in their edges in which rollers fit. Pins 131 on the discs 108 also project into the notches. Discs 108 are normally held against rotation by a pair of coupled levers 134, Fig. 2, pivoted at 48 to the end plates 3, 4, the ends 132 of the levers engaging notches 133 in the discs. When the document 2 is fed in, the leading edge rocks a tripping lever 45 about an axle 40 supported between the end plates. A lever 39, one of a pair at each end of the axle, rocks back, and a pin 52 thereon moves against a sloping portion of the tail of the lever 134 and raises the end of the lever from the notch 133, freeing the disc 108. As the discs 24, 25 turn, the rollers are jammed against the sides of the notches in the discs 127 and rotate together with the discs 108 since the rollers also press the pins 131. The whole printing assembly is thus turned to print a number on the document 2, and the end of the lever 45 rides on the periphery of the disc 108 until on completion of a revolution of the printing assembly it drops back into the notch 133 and stops the disc. The pins 131 then act to prevent the rollers from jamming in the notches, so that although discs 24, 25 continue to rotate while the document is passing through the apparatus, the printing assembly does not turn. When the trailing edge of the document has passed, the lever 45 returns to its original position. To vary the distance from the leading edge at which the number is printed, knob 118 is pressed to the left in Fig. 4, disengaging shaft 104 from the discs 108, and then turned and released. Knob 119 has a spring-pressed ball engaging recesses in a plate 122 on the wall 112 carrying a scale co-operating with a pointer on the knob 119.