Patent GB-517595-A (GB)
Title: Improvements in or relating to photographic copying apparatus
IPC: G03B27/62
Filed: 1938-08-04
Abstract: 517,595. Photographic copying apparatus. KODAK, Ltd. Aug. 4, 1938, No. 23043. Convention date, Aug. 4, 1937. [Class 98 (i)] Apparatus in which documents are conveyed by a rotating drum through the field of a camera so that one side of each may be photographed includes means for reversing the documents so that the other side of a selected document, or of each of a series of documents, may be advanced by the drum and photographed, - and means operable at will for permitting said reversing means to become effective. In the form shown, the drum 11 conveys the documents through the field of a camera as described in U. S. A. Specification 1,976,346, from hoppers 25 and 26. They are held in contact with the drum by. stretched wires 16. They may be stripped from the drum by fingers 30 which extend into peripheral grooves on the drum. If the fingers are removed from the grooves the document is fed to the chamber 54 and removed from the drum by plate 50. As it now rests on a rotating roller 61 it is reengaged with the drum 11 and fed through the machine again with its opposite side outwards. The guiding is assisted by members 19, 35, and 40 and rollers 18, 20 and 41. These rollers are driven from the drum 11 and the roller 61 is driven from the roller 41. A clutch housing 75 is also driven from the drum 11, the arrangement being such that when the disc 87 is allowed to rotate the shaft 71 also rotates, but is otherwise stationary. The disc 87 may be held against rotation by a lug, at the end of a pivoted lever 90, which may engage one of two shoulders 88 formed on its circumference. A cam 85 carried by the shaft 71 acts on two lugs 86 on a plate to which the fingers 30 are attached. By allowing the disc 87 and consequently the shaft 71 to rotate in timed relation to the movements of a document on the drum 11 it may first be allowed to pass under the fingers 30, reversed, photographed again and then to be stripped from the drum by the fingers 30. To secure this result the free end of the lever 90 is engaged by the edge of a cam disc 95 having pointed portions 96 and substantially circular portions 98. This and the disc 100 are mounted on the shaft 12 and rotate with the drum when the disc 100 is not restrained by the engagement of one of the lugs 110 or 111 with the end 109 of a pivoted lever 101. As a document is fed into the machine its forward edge strikes a series of fingers 108 which extend into the peripheral grooves in the drum 11. These are attached to a member pivoted at 107 and carrying a pin 105 engaging a groove 104 in the lever 101. Thus the lever is rotated and a projection 110 released from the end 109, allowing the members 95 and 100 to rotate until the next projection 111 strikes the lever 101. One of the points 96 thus rocks the lever 90 to release the disc 87 and allow the fingers 30 to be lifted from their grooves. When the document has passed the fingers 108 they return to the grooves in the drum 11 and the lever 101 releases the disc 100 which rotates until the next projection 110 abuts against its end 109. The corresponding movement of the cam 95 does not again release the disc 87 due to the shape of the portion 98 of its surface. The disc 87 is again released and the fingers 30 replaced in their grooves by the second passage of the document through the machine after reversal. A series of fingers which may be moved across the hopper 25 by a cam 120 on the shaft 71 ensure the proper relationship of the movements of the fingers 30 and the entry of the documents into the machine. The reversing means may be brought in or out of action by means of a lever 30 pivoted to the opposite end of the bell crank 93 to which the lever 90 is also pivoted. To obtain' the reversing action described it is depressed slightly and moved to the left, the shoulder 135 being engaged under a member 136. The resulting movement of the crank brings the end of the lever 90 into contact with the cam 95. In the position of the lever shown the reversing means is out of action. If the lever is depressed and moved to the right the reversing means is brought into operation but the lever is returned to the neutral position after the passage of the document by being struck by a pin 132 carried by the disc 87.