Patent GB-191116761-A (GB)
Title: Improvements in Photographic Enlarging, Copying, and Reducing Projection Apparatus.
Inventor: HOLST LODEWYK JAN RUTGER
IPC: G03B27/36
Filed: 1911-07-21
Granted: 1912-10-21
Abstract: 16,761. Holst, L. J. R. July 21. Enlarging, copying, and reducing.-Relates to a complete machine which combines reproducing-apparatus, such as described in Specification 15,027/11 with means for successively repeating an image on the plate to build up a pattern, in which the vertical and horizontal movements of the plateholder are automatically arrested at the end of each predetermined movement. The plateholder is carried by a frame 17, 17<a>, 17<b>, Figs. 1 and 2, which moves transversely on the frame 10, 10<a>, 10<b>, 10<c>, and the latter frame is vertically adjustable on the upright frame 7. The vertical movement of the frame 10, 10<a>, 10<b>, 10<c> is effected from a handle 26, which turns a threaded shaft 12 through the shaft 14<a> and mitre gearing 33, 34. The shaft 12 passes through a threaded nut 11<a> on the frame 10, 10<a>, 10<b>, 10<c>, and journals on hall bearings in a bracket 12<a>. To adjust the shift of the plate, a graduated index plate 28, Fig. 4, is freely mounted on the shaft 14<a>, and is locked to the handle 26 by a spring pin 27. The plate is graduated with one hundred holes, and carries a toothed wheel 28<a> which drives a second wheel 29 through a small wheel 30. The wheel 29 has one tooth less than the wheel 28, and a second graduated plate 29<a> freely mounted on the shaft can be clamped to the wheel 29 by a handle 32. The index plates are held at zero positions by a catch 31, which engages notches in the wheels 28, 29<a>. To obtain fractions of a revolution of the handle 26, two index fingers 35, 36 are adjusted to embrace the arc including the number of hundredths of a revolution required. One of the fingers is adjusted against the pin 27, which is then disengaged from the wheel 28, and the handle 26 is rotated until it engages the other arm. To obtain any number of complete revolutions required, the catch 31 is lifted and the plate 29<a> is turned backwards through an arc corresponding to the number of complete revolutions required. On turning the handle 26, which is locked by the pin 27 to the wheel 28, the wheel 29<a> gains one tooth per revolution, the notches in the plates 29<a>, 28 will again be in alinement at the end of the number of complete revolutions set by the wheel 29<a>, and the catch 31 will engage the plates and stop further rotation. To adjust the plate 29<a> in the dark, a stop 29<b> is fitted on the edge of the plate and is positioned to be arrested by the stop 31 each time the plate 29<a> is set. The horizontal step-by-step movement of the frame is effected by similar mechanism from the handle 26<1> on a screw shaft 14 which passes through a threaded nut 13<b> on the bar 17, and journals in brackets 15 on the end of the bar 10. The reproducing-apparatus 5 is adjusted for various enlargements from the wheel 18<a> which turns a screw shaft 18 journaled in a bracket 20 and passes through a screwed swivel nut 24 on the arm 22. The arm 22 turns the shaft 23, which journals in brackets 7<a> on the standard 6 and operates the arm 25 actuating the lens and design or pattern of the apparatus 5.