Patent GB-662368-A (GB)
Title: Improvements in photographic document copying apparatus
IPC: G03B27/50
Filed: 1949-05-12
Abstract: 662,368. Feeding webs. KODAK, Ltd. May 12, 1949 [May 13, 1948], No. 12707/49. Class. 100 (i). [Also in Group XX] A photographic document copying apparatus, through which a film strip is fed in synchronism with the movement of the documents to be copied includes control means having a part continuously moved by the moving film so as to reach a predetermined position periodically and timing: means which is energised when a switch is closed by a moving document and is adapted to render the apparatus inoperative after an interval of time greater than that required for said part to reach its predetermined position, said timing means being re-set automatically each time said part reaches its predetermined position to initiate another time interval. In the documentcopying apparatus shown, documents are fed between rollers 10 and 11 and glass plates 13 where they are exposed to light from lamps 14 so that juxtaposed images of each side of the document . are formed on a film passing round a roller 22, geared to the rollers 10, by light directed through a lens 16 by reflectors 18, 19. As a document enters the nip between rollers 11, it contacts fingers 38, pivotally carried at 40 by a rod 39 These fingers and rod 39 are thus rotated clockwise so that an arm 41 on rod 39 closes a switch 44 to energize a motor 30 and thus cause the film to be fed in synchronism with the documents. Movement of the film causes rotation of a roller 50<SP>1</SP> carrying a contact strip 54' which brushes contacts 120, 121 once per revolution to energize a solenoid 62. This solenoid forms part of a timing mechanism which also includes an electric motor 60 that is energized when switch 44 is closed and drives a shaft 63 through gears 75, 76. Shaft 63, when solenoid 62 is de-energised, is clutched at 64 with a shaft carrying an arm 77 which is rotated against the action of a spring 78 and a cam 65. In the path of an arm 77 is a pin 71, carried by a plate 70 and the position of which relative to arm 77 is determined by rotation of a knob 69. Provided the film continues to run, solenoid 62 is energised and the shafts de-clutched before arm 77 contacts pin 71, whereupon spring 78 returns the arm to its initial position. If however, the film drive fails, arm 77 rotates into contact with pin 71, and the cam 65 rotates sufficiently to actuate a switch 66 whereby the motor 30 is de-energised. Thus, knob 69 is rotated so that the time interval, as marked on the plate 70 and observed through an aperture 73 in the casing of the timing mechanism, required for the arm 77 to contact pin 71 is greater than that required for roller 50 to complete one revolution. If switch 66 is actuated, motor 30 is de-energised and a pilot lamp 116 ignited. Thereafter a switch 118 is closed to energise temporarily motor 30 so that the documents already fed into the machine can be withdrawn therefrom. Another embodiment is described wherein the rotation of the film driving roller 22 is translated by a contacting and eccentrically mounted roller and a pivoted lever into reciprocation of the movable contact member of a double pole switch and wherein two identical timers are alternatively operative. Specification 637,268, [Group XX], is referred to.