Patent GB-730604-A (GB)
Title: Improvements in or relating to photographic copying apparatus
IPC: G03B27/465
Filed: 1952-10-17
Abstract: 730,604. Photographic document-copying cameras. KODAK, Ltd. Oct. 17, 1952 [Oct. 17, 1951], No. 26139/52. Class 98 (1). An apparatus in which documents in one stack on a copy holder are transferred one at a time to a second stack on the holder, and during the transfer are turned over so that the reverse side of one document and the obverse side of the next document are presented at the same time for photographing on a light-sensitive strip in an exposure gate comprises optical means for imaging the different pairs of sides on successive displaced areas of said strip which abut along one longitudinal edge and are displaced longitudinally by a distance equal to one half of the length of each area so that the images of the two sides of each document are disposed side-by-side in the width of the strip, shutter means provided with apertures co-operating with said optical means to make successive exposures of each of said different pairs of sides, means for advancing through the exposure gate a length of strip equal to the length of the area, a clutch connecting drive means to the advancing and shutter driving means so that the shutter and strip move in synchronism, and an escapement mechanism operated by means actuated by manual control for each exposure to control the driven member of the clutch so as to provide a cycle of operation for each revolution of the clutch in which successive areas are exposed and the lightsensitive strip is advanced. As shown, cheques, copies of both sides of which are required, are placed in a recess 18 in a base 15 and limited by a fixed wall 19 and a movable rear wall 20 so that the cheques may be successively transferred from a stack 42 to an adjacent stack 43 and are copied by means of a camera 25 having a film exposure gate 28 in which is slidable a masking plate 32 forming by co-operation with a fixed plate 30 an aperture 31 as best shown in Fig. 14 and adjustable in accordance with the document by means of an endless chain 22 movable with said wall 20 rotating by means of a further sprocket and chain drive a cam 85 engaged by a pin on a pivoted level 82 connected by a link 79 to a link 88 pivoted to the plate 32. A frusto-conical shutter drum 44 provided with two diametrically opposite pairs of adjacent but laterally and circumferentially spaced apertures 45a and 45b, 46a and 46b is rotatable between the film F and a pair of laterally and longitudinally spaced objectives 40, 41, the two apertures 45a, 46a co-operating with the objective 40 and the apertures 45b, 46b (Fig. 5, not shown) co-operating with the objective 41. As the aperture 45a first moves across the objective 40, the first exposure records only the front F1 of the first cheque in the half a of the film, but when the cheque has been turned over and placed at 43, the second expdsure made by the passage of the aperture 45b across the objective 41 records one above the other, the rear B1 of the first cheque and the front F2 of the second cheque in the half b of the film. The film is then fed forward an amount equal to the length of the area exposed at each exposure whereafter the third and fourth exposures are effected by the apertures 46a and 46b. This method of recording is described and claimed in Specification 705,629. With the present invention, an electric motor 50 drives through worm gearing and a friction clutch 54 a shaft 57 which with a 2 : 1 reduction through sprocket and chain and bevel gearing rotates the shutter 44 and also rotates without reduction through a friction clutch 61a, a shaft 61 bearing a disc 62 to which is pivoted eccentrically a link 70 pivoted to an arm 71 freely rotatable on the shaft 72 of a film-feeding roller 29 to which shaft is also secured a ratchet-toothed disc 74, whereby an anticlockwise urged pawl 73 pivoted on the arm 71 and engaging with said disc effects a ratchet-drive feed of the film at each upward movement of the link 70. The feed is limited by a cam disc 77 which is freely rotatable on the shaft 72 and which engages a pin 92 on the pawl 73 to disengage it from the disc 74. The extent of the film feed is adjusted in accordance with the cheque size by connecting the cam 77 to the link 79. The movement of the link 70 also moves a link 93 horizontally to rotate a disc 38 to which it is pivoted eccentrically- and which by means of a further eccentrically pivoted forked arm 36 raises the platen 35 for the film gate. The sequence of operations is controlled by means of a disc 100 pinned to the shaft 57 and having two pins 101a, 101b and a co-operating escapement pawl 103 movable against a spring 107 by a solenoid 102 energized by a pair of series-connected switches 111, 'this switch arrangement necessitating both the hands of the operator being clear of the copying field. Assuming the disc 100 andpawl 103 are initially as shown in Fig. 8, energization of solenoid 102 moves the shoulder 107 clear of the pin 101a and the finger 108 into the path thereof so that the first exposure is made. Release of the switches 111 allows return of the pawl so that pin 101a is freed and the disc -rotates until pin 101b is arrested by shoulder 107. A second actuation of the switches after turning over the first cheque and placing it on the stack position 43 then causes the pin 101b to be released from shoulder 107 so that the second exposure is made, pin 101b then being arrested by finger 108. Release of the switches 111 then causes the pin 101b to be freed and the shafts 57, 61 rotate to feed the film until the pin 101a is re-engaged by the shoulder 107. If the switches 111 are depressed only momentarily, the first two movements of the disc are combined but a second exposure, still awaits a second actuation of the switches, and similarly the second exposure and film feed movements of the disc are continuous but a third exposure awaits a further switch actuation. If initially the pin 101b is engaged by the shoulder 107, the first exposure is followed by a film feed, but thereafter the pin 101a engages the shoulder 107 so that the cycle of operation becomes as already described. A clockwiseurged pawl 115 is adapted to engage pin 117 located diametrically opposite pin 101a, 101b to prevent backward movement of the disc 100 when the pins 101a, 101b engage the pawl 103. Specifications 526,296 and 528,952 also are referred to.