Patent GB-1056111-A (GB)
Title: Improvements in or relating to photocopying apparatus
IPC: G03D3/06
Filed: 1964-04-17
Abstract: 1,056,111. Photographic processing apparatus. W. ZINDLER [trading as LUMOPRINT ZINDLER KOMM.-GES], April 17, 1964 [April 27, 1963], No. 16053/64. Heading G2A. In a photographic processing apparatus the motor operating the paper transport is also connected to a lever controlling the discharging and refilling of a supply container associated with a developer dish, the lever being moved through a predetermined angle when the motor is started, and back again when it is stopped. As shown in Fig. 1b when not in use the developing liquid is stored in a flexible bag 34 housed below the developing bath 36. When the apparatus is to be used, a pressure plate 3 carried by a spring plate 31 is lowered on to the bag to compress it, and so drive the liquid through pipe 35 into the bath. Photographic sheets are then passed through the bath between guides 60, and squeezed together between rollers 38, 39 in the usual way. On raising pressure plate 3, the liquid flows back into bag 34. The end of spring plate 31 is secured in a square rod 58, so that rotation of rod 58 controls the liquid flow. The transport rollers 38, 39 are operated by an electric motor 2, which can be energized by closing either of two switches 13 or 33 arranged in parallel. The apparatus is initially started by turning clockwise a triangular plate 4, by means of a handle, from the rest position of Fig. 1a into the position of Fig. 2a. The plate turns on a pivot sleeve 6, on which is also mounted a lever 9. Plate 4 and lever 9 are connected, via respective pins 7 and 10, by a bow-shaped spring 11. Thus clockwise movement of plate 4 causes anticlockwise movement of lever 9, whose lower edge consequently pushes in contact 55 of switch 13, so starting the motor 2. This drives an intermediate gear 15 which, besides driving rollers 38, 39, also drives a crank disc 16 in the direction of arrow 59. Disc 16 carries a fixed pin 18 having a roller 19 thereon, and as the disc rotates, the roller 19 engages against a flanged part 21 of a control lever 20 which is pivoted at 40, thus pivoting lever 20 downwards. At the other end of lever 20 is a guide bolt 24, 25, which slides in a slot 66 of another lever 28 pivoted on a pin 57. Thus as lever 20 pivots downwards, lever 28 is also caused to pivot downwards. As it turns, it engages against a further lever 30 fixed to a pin 57, so that pin 57 turns also. The other end of pin 57 forms the square-section pin 58, so that the drive from the motor, transmitted through disc 16, levers 20, 28, 30 and pins 57, 58 operates plate 3 to force the liquid up into the bath for operative use. At the same time, a switch finger 32 releases switch 33 to close the second motor circuit. (Switches 13 and 33 work in opposite directions.) The apparatus is stopped by turning plate 4 anticlockwise, which causes clockwise movement of lever 9. This moves away from, and so opens, switch 13, although the motor is still in circuit because switch 33 is still closed. Continued rotation of disc 16 causes lever 20 to pivot upwards again, by means of roller 19 bearing against a coupling lever 27 and hence pin 26, which is fixed to lever 20. This in turn causes lever 28 to pivot upwards again, thus turning pin 58 and so raising plate 3 until its movement is arrested by an abutment 42. The liquid in the bath 36 can now run back into the bag 34, all the parts approaching once more the rest position of Fig. 1a. Switch finger 32 engages switch 33 once more to open it, and so shut off the motor.