Patent GB-546257-A (GB)
Title: Improvements in or relating to photographic copying apparatus
IPC: G03B27/62
Filed: 1941-07-18
Abstract: 546,257. Photographic copying-apparatus. KODAK, Ltd. July 18, 1941, No. 9140. Convention date, July 19, 1940. Addition to 517,595. [Class 98 (i)] In the photographic apparatus for copying documents forming the subject of the parent Specification a yieldable connection is provided between the movable guide means 10 by which the documents may be led to the reversing means and the control means therefor. As shown, the general construction is the same as that described in the parent Specification, the documents being fed, according to their size, by either of two hoppers 8 and 9 to a rotating drum 1 by which they are carried behind a glass plate 3 through which they are photographed and thence to the guide means 10, which consists of a series of fingers carried by a plate 28. In the position shown, the fingers lie in circumferential grooves on the drum, so that when the document reaches them it is stripped by them from the drum. When both sides of the document, however, are to be photographed, the plate 28 is moved to carry the fingers clear of the surface of the drum, when they form guide means beneath which the document is carried to a reversing-chamber formed between plates 12, 13. Here the front edge of the document strikes the plate 12, whereby it is stripped from the drum and reversed face for face. It is then directed by a rotating rubber-covered roller 20 back on to the drum and is carried round below the edge of the plate 12 and so that the opposite side is photographed through the plate 3. When it again reaches the fingers 10 they have been returned to the position shown, so that they strip the document from the drum. In order to move the fingers 10, the plate 28 which carries them is mounted on arms 29 pivoted at 30, and is rocked by an adjustable spring blade 35 which engages a cam 32 on a shaft 25. This blade forms the yieldable connection between the cam and the fingers which it operates, so that should for any reason a document be beneath the fingers when the cam tends to move them they will not damage it. The movement of the fingers 10 is controlled, as described in the parent Specification, by an arm 50 which is rocked by fingers 52 engaged by the document and the end 51 of which engages alternately lugs 48, 49 on a trip plate 47. When the leading edge of the document engages the fingers 52 the arm 50 is rocked to disengage a lug 48, and the trip plate then, together with a cam 44, rotates with the drum to cause one point 45 of the cam to rock a lever 43., thereby disengaging a lug 42 on this lever from a shoulder on a fourshouldered disc 40 on the shaft 25. This shaft then rotates through a quarter of a revolution causing the cam 32 to rock the fingers 10 away from the drum. As the trailing edge of the document passes the fingers 52 the lever 50 is returned, and the shaft 25 again makes another quarter revolution, during which the cam 32 maintains the fingers 10 stationary. After reversal of the document, its leading and trailing edges cause the third and fourth quarter turns of the shaft 25 to occur as before, the third quarter turn causing the fingers 10 to return to the stripping position shown, in which they remain during the fourth quarter turn so that the document is stripped from the drum. To prevent insertion of a document before the preceding one has passed the hoppers for the second time, pivoted members 53, 54 are moved by a lever 60 operated by a cam on the shaft 25 so as to block the hoppers during the first three movements of the shaft and to free them again during the last quarter revolution. When one side only of the documents is to be copied, operation of the shaft 25 is prevented by moving the lever 43 out of contact with the cam 44 by movement of a control lever 70, as described in the parent Specification, the fingers 10 remaining in the stripping position. The glass plate 3 may be slid out for cleaning, is removal causing the opening of a switch in the motor circuit to prevent operation of the machine until it is replaced.