GB1073088A - Improvements in or relating phototypesetting apparatus - Google Patents

Abstract

1,073,088. Photo - typesetting apparatus. HARRIS - INTERTYPE CORPORATION. July 8, 1964 [July 12, 1963], No. 28177/64. Heading B6W. [Also in Division G2] In photo-typesetting apparatus of the type having a continuously rotating matrix disc 120, Fig. 1, and a light source 115 adapted to illuminate selectively characters on the disc controlled by a coded tape 10, the tape 10 also controls an adjustable optical system including a pair of lenses 125, to vary the point size. Any adjustment to the optical system also results in an automatic variation of the intensity of the light source and an automatic variation of the unit width allotted to the character selected according to the point size of the character selected. Variable optical system, Fig. 4.-The optical system is similar to that described in Specification 919,465 and comprises two lenses 125 mounted on carriages 185 movable by endless bands 184. A reversible motor 184 drives the bands. Stops 186 on the carriages 185 engage abutments 188 on a drum 190 which is rotated to a selected position by a selector drive motor 198 via a slip clutch 199 and a ratchet 200. Point size control, Figs. 1 and 4.-When an automatic point size control code appears at the reader 15, the reader stops and the following takes place: (a) Power is supplied to the reversible motor 182 to move the lens carriages 185 apart to the ends of the drum 190 so that the drum is free to rotate. (b) Simultaneously, power is supplied to the selector drive motor 198. (c) When the carriages 185 reach their path extremities, a pair of switches L1 and L2 (in series) are closed. Motor 182 is stopped and the drum 190 is rotated to a selected position when the solenoid 205 operating intermittently to release the pawl 202 allows the drum to rotate. The amount of rotation of the drum 190 is controlled by a size selector stepping switch 225 coupled for direct rotation with the drum. Potentials are applied to various termini of the switch according to the code following the point size control code on the tape 10. When the required amount of rotation of drum 190 is achieved, according to this code, the intermittent energization of the solenoid 205 ceases. (d) When the drum 190 is in its selected position, the motor 198 is de-energized and the motor 182 is energized to move the lens carriages 185 inwardly until the stops 186 engage the abutments 188. (e) When step (d) is achieved, the motor 182 is de-energized and a " tape advance " signal is sent to the reader 15 to commence type setting of the characters with the new point size. Unit width control, Fig. 1 and 4.-Coupled for direct rotation with the drum 190 is a point size stepping switch 152 which has seven output circuit lines from its seven different levels connected through a cable 150 to the space computer 145. Flash-light intensity control, Figs. 1 and 4.- Coupled for direct rotation with the drum 190 is a spark intensity control stepping switch 265. Through this switch, connections can be completed at five different levels thereof to five A.C. relay coils. The contacts of these relays are connected to form parallel circuits with a plurality of spark firing condensers, and these condensers are in turn connected according to a selected pattern, to the spark control unit 112. In this manner the intensity of the spark is varied such that greater capacitance and a more intense spark discharge is employed at the larger point sizes, where greater illumination is required.