Patent GB-765391-A (GB)
Title: Improvements in or relating to precision gauges for setting a traversing member which measures character and space widths in linear composition in a photographic-type composing machine
Inventor: JUPP ROBERT ALFRED
IPC: B41B21/20
Filed: 1955-02-14
Abstract: 765,391. Photographic type-composing. MONOTYPE CORPORATION, Ltd. Feb. 14, 1955, No. 4271/55. Class 98(1) A photographic type-composing machine includes a member which is moved stepby-step to determine the width to be allocated to each character or blank space in a line, a gauge black adjustable bodily on the member to indicate its starting point relatively to a fixed stop co-operating therewith, the gauge block being movable within itself to move the member with micrometer precision relatively to the starting point determined by the gauge block and the fixed stop. The movable member may be a carrier for the photosensitive surface, but in the form shown in Fig. 1 it consists of a, carrier whereon mirrors A, A<SP>1</SP> are mounted at right-angles to each other and at 45 degrees to horizontal guides X on which the carrier moves, the mirrors reflecting light from a lens system to a photo-sensitive surface, which are both stationary and are not shown in the Figures. The carrier is moved step-by-step for character spacing by known means acting on a draw bar A<SP>2</SP>. A gauging block B is slotted to slide on draw bar A<SP>2</SP>, and has a housing B<SP>2</SP> slidable thereon and carrying a pointer B<SP>1</SP> (see also Fig. 2) co-operating with a scale A<SP>3</SP> on bar A<SP>2</SP>. The left-hand end B<SP>12</SP> of gauge block B co-operates with a surface A<SP>4</SP> on the casing X' wherein the mirror carrier is mounted to determine the position of. projected carriers with respect to a lefthand margin. A spring-loaded locking bolt B' carried in housing B<SP>2</SP> has teeth B<SP>8</SP> which engage teeth of a rack A<SP>5</SP> formed on the upper edge of bar A'. To set bar A<SP>2</SP> for a given length of line, bolt B<SP>7</SP> is raised and turned by a knob, so that projections thereon leave their recesses in the bolt bearing and keep the bolt raised. With the surfaces A<SP>4</SP>, B<SP>12</SP> in contact bar A<SP>3</SP> is adjusted for the required line length, and is then locked to block B by lowering bolt B<SP>7</SP>. In this way, a second column can be composed on a page beside a first column. When the magnification of the projected image is varied, the position of the stop may have to be adjusted to compensate for the edge of the character image extending beyond or falling short of the margin. This is effected by a micrometer screw B<SP>4</SP> mounted in a bearing on block B and threaded into housing B<SP>2</SP>. When screw B<SP>4</SP> is rotated by means of knob B<SP>6</SP>, block B<SP>2</SP> is moved relatively to housing B<SP>2</SP>, which is locked by bolt B<SP>7</SP>. The extent of the movement is indicated on a scale on block B by means of a pointer on the housing B<SP>2</SP>. When the surfaces A<SP>4</SP>, B<SP>12</SP> are in contact, a spring B<SP>13</SP>, mounted on block B and engaging a shoulder on the casing X<SP>1</SP>, helps to prevent accidental separation of the surfaces. Specification 563,331 is referred to.