Patent GB-943005-A (GB)
Title: Photographic projection-printing machine for use with light-sensitive material in roll form
IPC: G03B27/58
Filed: 1960-03-22
Abstract: 943,005. Photographic printing machines. AGFA A. G. March 22, 1960 [March 26, 1959], No. 10192/60. Heading G2A. A photographic projection printing machine for light-sensitive material in roll form includes devices for setting variable masking means for different print sizes and for setting variable advance means for the light sensitive material corresponding to the selected print size, and control means common to both devices whereby one control operation effects corresponding setting of both devices. As shown in Figs. 2 and 4, a forked guide member 35 can be adjusted to any of the positions I, II, or III by a control knob 6 on the exterior of the casing which constitutes the common control means. A motor driven rotating disc 12 produces, on each rotation, three immediate actions: (1) roller 19 is caused to impart a reciprocating action on fork 20 which is transmitted to a toothed segment 25 via levers 22, 24 the angle between which, in dependence upon the prior setting of fork 35, determines the amplitude of the reciprocation of segment 25 and pinion 27, and hence the amount of rotation imparted, in one direction only, by the pawl 29 to the ratchet wheel 30 whereby rollers 31, 32 feed the printing material 33 by a fixed amount, this amount thus varying, according to the desired size of print, in dependence on the setting of the fork 35; (2) lever 17 operates rod 85 to control a cutter 65; the transmission of the motion of 17 to-the rod 85 is controlled by the positioning of rod 105 and associated parts, according to the number of prints desired in the form of a single strip; (3) lever 60 operates a numeral stamping device 53. The setting of fork 35 to any one of the three positions corresponding to different amounts of feed also operates, via levers 51, 42 a pair of masks for varying the printing field on the material 33, and, via lever 87, pivoted to a lever arm of fork 35 at 89 and to the cutter assembly at 88, adjusts the position of the latter, in correspondence with the selected print size, so that the cut will be made in the margin between two prints. The stamping device 53 is so positioned that it will always fall within the boundary of the print just exposed whatever the size of the print. For individually-cut prints control 7 is set to the position shown in broken lines in Fig. 6 whereby rod 105 is moved to the right the pins 113 pivoting lever 85 so as to bring the concave abutment 111 into the path of pin 112 of lever 17 which will thus operate the cutter once in each revolution of disc 12. This setting is maintained by latching lug 116 of lever 115. To obtain a strip carrying a selected number of prints, control 7 is set to the full-line position shown in Fig. 4 to allow rod 105 to be moved into the position shown by spring 122 whereby abutment 111 is moved out of the path of pin 112 so that the cutter will not be operated until the lever 17 has moved a selected number of times (according to the setting of control 8) after which, by means of the alternate engagement and disengagement of an abutment 125 and the toothed portions 128 of lever 99 with, respectively, the toothed member 126 and a pin 124 of the lever 17, the lever 99 is pivoted anti-clockwise in step-bystep fashion causing lever 98 to move rod 105 to the right so that pin 112 may strike abutment 111 to operate the cutter. The number of strokes of lever 17 required to bring rod 105 to this position will depend on the initial angular setting of lever 99. This is controlled, in accordance with the setting of control 8, by the action of lever 90 on the upper end 103 of lever 99, compensation for different print sizes being made automatically by coupling of lever 90 to the carriage of the cutter 65. Alternatively, the step-by-step pivoting of lever 99 may be produced by a ratchet wheel pivoted on 93 cooperating with a pin on lever 99.