Patent GB-189820888-A (GB)
Title: Improvements in Apparatus for Reproducing Type Faces.
Inventor: LOCK WILLIAM HENRY
Filed: 1898-10-04
Granted: 1899-09-30
Abstract: 20,888. Lock, W. H., and Barr, M. Oct. 4. Type.-Relates to apparatus for reproducing the face of a type on a larger scale. An apparatus for this purpose is also described in Specification No. 23,397, A.D. 1896. A standard 2, capable of a transverse movement across the bed-plate 1, carries a projection surface 5 which consists of a continuous band of sensitive paper carried on rollers 6. The rollers are mounted in bearings projecting from the inner ring 8 of a pair of gimbal rings. This ring is capable of a vertical motion up and down the standard 2. The type 13 to be reproduced is held in a vice 14 supported by the inner ring 15 of a pair of gimbal rings. The vice is also attached to a plate 16 capable of sliding in a standard 18 fixed to the bed-plate. The outer rings 12 and 20 of the two pairs of gimbal rings are connected by rods 23, which also pass through the inner member 31 of a pair of gimbal rings supported in a standard 24. The standard 24 is adjustable by means of a screw and nut, and thus forms a movable fulcrum for the rods 23, which constitute a system of levers. The optical system for projecting the face of the type 13 consists of a compound microscope 33 having a projecting ocular in combination with a secondary magnifying system, capable of adjustment by suitable means such as the screw 36. A funnel 36<a> is arranged between the projection surface and the optical instrument, and has opaque discs 37, 38 across the ends to cut off the outer rays. A tube 74 admits light to the prism. The optical system is supported by a bracket 66. The projection surface must be moved past the face of the type 13 so as to follow a gridiron line in order that the face of the type may be photographed in sections. The mechanism here employed for this purpose consists of a screw 43 which engages a nut 45 on the foot of the standard 2. A worm-wheel 46, Fig. 4, is fixed to the end of the screw 43, and may be engaged by either of the two driving-worms 52, 53 according to the direction the standard has to be moved. The shafts 50, 51 carrying the worms are provided with pinions engaging a mitre-wheel 49 secured to the driving-shaft 48 and turn in bearings in the block 47, which rocks upon the shaft 48. The rocking of the block 47 so as to engage the worms with the wheel 46 is effected by suitable means, such as by magnets 57, 58 having their armatures 59, 60 fastened to the block 47 and adapted to be alternately magnetized. A motor is employed to drive the shaft 48. The screw 61, which governs the vertical motion of the projection surface and which travels with the standard 2, has a star-wheel 67 secured to it, which is operated at the proper moment by means of spring-controlled fingers pivoted to the bed-plate. The projection surface and the face of the type move past the optical system in opposite directions, as they are at the opposite ends of a lever with an intermediate fulcrum. By this arrangement the sections to be photographed are kept in focus. If the optical system is such as to cast an erect image, the fulcrum is placed beyond the type. In a modified form of the apparatus so arranged, a single lever replaces the rods 23, and is connected to the various parts by ball-and-socket joints. The fulcrum of this lever is provided by a ball carried in a bracket placed beyond the type.