Patent GB-190428440-A (GB)
Title: Improvements in Microscope Tracing Apparatus
Inventor: NEWTON HENRY EDWARD
Filed: 1904-12-27
Granted: 1905-02-02
Abstract: 28,440. Newton, H. E., [American Type Founders Co.]. Dec. 27. Microscopes ; p a n t ographs.-Relates to pattern - reproducing apparatus,comprising a tracing- microscope and a pantographic or like marking or cutting apparatus, for obtaining proportional or non-proportional enlargements, or italicized or back - sloped reproductions, from a pattern such as a type or type-bar, print, drawing, or engraving, and particularly adapted for obtaining patterns for use in machines for cutting type dies or punches. The tracing- microscope E, Figs. 1 and 4, is mounted on a block 53 adjustable on a rotating table A, which is supported by one or other of two brackets B, C on a table D carrying the paper or other material on which the pattern is to be reproduced. The pattern is carried by a table 93 adjustable for inclination in a carrier F, which is supported on carriage plates 100, 101 for horizontal movement in any direction. The pantograph a, b, b<1>, c, c' is pivoted at 35 directly over the pivot stud of the table A. The inner end of the arm c carries an adjustable block e<2> provided with a pin for connection to the carriage plate 100. The arms b, b<1> are formed of two strips of metal secured by blocks 36, and the pivots 30, 31, 34 are fixed in the members a, c' and seated in conical bearings in the two bars of the arms b, b<1>, the lower bearings being adjustable. The arm c is secured to the arms b, b<1> by adjustable pivot mountings 32, 33 on heads e, e<1> adjustable longitudinally on the arms b, b<1>. The reproducing-tool is preferably of the form shown in Fig. 18. A shouldered post 123 passes through the arm a and carries a finger-piece 124 secured by a set-screw 125. The post 123 is perforated to receive a lead or other marking- device 126, upon which rests a pin 127 provided with a finger-piece 128. The microscope E, Figs. 1 and 4, is guided by adjustable rolls 60 on arms 58 on a bracket 57. which is secured to one arm of a bracket 56 on the block 53. The adjustment rack 62 engages with a pinion 63 on a shaft 64 mounted in a block 65, in which the microscope is held frictionally. The block 65 is held in position by engagement of a roll 68 against a lever 67, and the connections of the lever 67 are such that, when the table 93 is inclined for non-proportional work, the microscope is automatically focussed. The lever 67 is carried by a block 70 pivoted to a block 72 adjustable according to a acale f for inclination of the table 93. The outer end of the lever 67 carries a counterweight 86 and bears under a roll 77 on a slide 78, which can be held against upward movement by a cut-away screw head 80. A cord or wire 82 is attached to the slide 78 for connection to the pattern carrier. For italicized or backsloped work, the table 93 is inclined and the pattern is turned so that its base line is inclined to the plane of the tracing movement. The tracer used in the microscope may consist of crossed threads or a glass disc having a central dot. Difference of width or weight of lines in non-proportional work is compensated for by using a tracer having a central oblong dot y, Fig. 16. The tracing-microscope may be movable and the pattern stationary.