Patent GB-191113517-A (GB)
Title: Machine for Forming Designs by Means of Photography.
Inventor: HEIDE HENRY CONRAD
IPC: G03F7/22
Filed: 1911-06-06
Granted: 1912-05-23
Abstract: 13,517. Heide, H. C., [Print Weave Co.]. June 6. Enlarging, copying, and reducing.-In a complete machine for making designs from a copy, enlarging - mechanism such as described in Specifications 13,934/09 and 13,935/09, is combined with means for moving the sensitive plate in exact predetermined steps to obtain the required number of repeats to complete the design. The plate-holder is carried by a frame 11, 12, 13, 14, Fig. 2, which is suspended from and moves transversely on the guide 8 of a frame 8, 9, 10, and the latter frame is vertically adjustable on the smooth vertical guideways of the upright frame 3, Figs. 1 and 2, secured to the base 2 of the machine. The guide 8 is situated slightly towards the lens side of the vertical plane passing through the centre of gravity of the frame 11 ... 14, whereby gravity will tend to keep the lower edge of the said frame tilted against the guide 9. The frame 6 on which the lens slide 51 is mounted is secured to a beam 5 stretching between the uprights 3 and the graduated wheel 67 for adjusting the enlargement or reduction turns in the bracket 69 on the beam 5. The horizontal movement of the plate is effected by a handle 25 mounted on a threaded shaft 15, which passes through a threaded nut (not shown), at the rear of the bar 11, and is journaled in a bracket 16 on the bar 8, the shaft at its outer end being journaled in another bracket (not shown). The vertical movement of the plate is effected by means of two threaded shafts 17 journaled in brackets 18 on the upright 3 and passing through threaded nuts on the rear of the cross bar 8. The shafts are rotated by a handle 25<1> through gearing 20, 21, 22. To balance the weight of the plateholding frame, a counterweight 28 is suspended over pulleys 27 at the top of the frame 3. To gauge the shift of the plate on turning the handles 25, 25<1>, dials 114 are secured to brackets on the plate frame, and are graduated with a series of holes 115, which are adapted to be engaged by a spring pin 116, Fig. 5, for locking the shaft against rotation. The shaft is unlocked by pressing the knob 119. In order further to facilitate an accurate movement of the plate without having to count the revolutions of the handle 25, a sliding stop 32 is mounted on a rod 29 on the bar 8, and has a projection 34 which is arranged to be engaged by a similar projection 35 on a sliding stop 36 mounted on a graduated strip 37 on the bar 11. The stop 36 is set at a distance from the stop 32 equal exactly to the width of the first image projected and the handle 25 is rotated until the stops 34, 36 engage. The stop 36 is then again moved back along the bar 37 through exactly the same distance, and so on. A similar arrangement is provided for measuring the successive vertical movements. A sliding stop 46, Fig. 1, is mounted on a vertical rod 44 on the frame 3, and engages with a second stop 47 mounted in a graduated strip 48 on the end pieces 10 of the plate carriage. To obviate successively shifting the stops 36, 47, these stops may be kept fixed, and the stops 32, 46 may he shifted back each time to the zero of the graduated scales, and further fixed stops 32<a>, 46<a> may be provided on the scales to arrest the stops at the zero position. The stops, may be set to allow a slightly larger movement than actually required, the dividing-heads being used to bring the carriage back to the exact position.