Patent GB-707944-A (GB)
Title: Improvements in or relating to control mechanism for photographic-type composing machines
Inventor: DEWHURST MAURICE RICHARD
IPC: B41B27/14
Filed: 1952-05-20
Abstract: 707,944. Photographic type-composing machines. MONOTYPE CORPORATION, Ltd. May 20, 1952, No. 12704/52. Class 98(1) A control mechanism for a record-strip controlled photographic type-composing machine comprises four pistons having different lengths of stroke and operated by air controlled by the record-strip, a pivoted lever operated by any one of the pistons, a component carried by the lever which can be variably positioned relatively to three air supply valves according to which of the pistons is actuated, and a mechanically operated device which in each cycle of operation acts through the said component on one or more of the air supply valves to supply air to one or more of three air-distributing valves which when operated act as selected upon a lens shutter, a driving mechanism for a step-by-step movable character-projecting reflector, a re-setting mechanism, and a record-strip feed mechanism. As shown, the mechanism is applied to a photographic type-composing machine of the kind described in Specification 563,331. A casing A has cylinders in which pistons A<SP>1</SP>, A<SP>2</SP>, A<SP>3</SP>, A<SP>4</SP> move the pistons having different lengths of stroke and having stems which project through the casing beneath two arms of a lever B pivoted to the casing:at B<SP>4</SP> and having a third arm B<SP>3</SP> to which a bar B<SP>5</SP> is pivoted. Sliding valves C, C<SP>1</SP>, C<SP>2</SP> control the supply of air to valves E, I, L. To effect justification, two wedges are set by separate signals on the record-strip; as the record-strip is fed backwards over an air supply bar X during composition, these signals appear first. The uncovering of a port 1 supplies air to a device X' to set one of the justification wedges, and also supplies air by a pipe 1a a to the piston A<SP>1</SP>, which rises and tilts lever B, bringing a projection B<SP>7</SP> on bar B<SP>5</SP> opposite valve C. A disc D with six teeth D<SP>1</SP> is geared to a cam-shaft to rotate onesixth of a revolution for each cycle of the machine, so that, at a certain part of the cycle, a tooth D<SP>1</SP> acts on bar B<SP>5</SP> to depress valve C. This allows air to pass by pipe 2 to valve E which is operated to allow air from a supply 20 to pass by a pipe 3 to a piston F, which closes a lens shutter G so that no image is projected during setting of the first justification wedge. Air also passes by pipe 4 to a mechanism Y which controls the step-by-step advance of a reflector which determines the character spacing and prevents this mechanism from operating while the justification wedge is being set. The uncovering of a port 5 admits air to a device X2 for setting the second justification wedge. This air also passes through a pipe 5a to raise piston A<SP>2</SP>, bringing projection B<SP>7</SP> again opposite valve C. As before, shutter G and mechanism Y are prevented from operating. When any devices set during a line of composition are to be re-set, ports 7, 8 are uncovered in conjunction with ports 1, 5. When ports 5, 7, 8 are uncovered simultaneously, air admitted through port 5 causes one of the justification wedges to be set, and prevents operation'of shutter G and mechanism Y, as described above. At the same time, air through ports 7, 8 acts on a switch 5 and passes by a pipe 9 to a lock-out device H, which halts the record-strip during three successive cycles of the machine for each justification signal. Air also passes by pipe 10 to piston A<SP>4</SP>, which is raised, and since it has a longer stroke than pistons A<SP>1</SP> A<SP>2</SP> it turns lever B and places a projection B<SP>6</SP> on bar B<SP>5</SP> opposite valve C, and projection B opposite valve C<SP>2</SP>, so that both valves are operated at the next movement of disc D. Operation of valve C<SP>2</SP> admits air by a pipe 12 to the valve I, which operates to allow air from supply 20 to pass by pipe 11 to release a clamp J normally holding a driving bar attached to the reflector. Air also passes by a pipe 12a to a feed mechanism K to advance the film to receive a fresh line, and by a pipe 12b to valve L which is thus re-set for operation by the first justification signal uncovering port 1. In composing tabular matter, each section of each line is composed as an open line of full measure, and is completed by justification signals without re-setting signals. At the end of the last section, the re-setting signals uncovering ports 7, 8 appear together with the justification signals. When an inaccurate line is composed, to prevent it from being photographed signals are made which uncover ports 6, 8 simultaneously. Switch 5 is operated, passing air by a pipe 13 to raise piston A<SP>3</SP>, thus placing projection B7 in line with valve C<SP>1</SP>. When valve C<SP>1</SP> is operated, it transmits air by pipe 14 to valve L, which admits air from supply 20 through a pipe 15 to piston F to hold shutter G closed. Air is also transmitted by a pipe 16 to the mechanism Y to release the driving bar of the reflector. During each cycle a disc M operated from a cam-shaft is rotated and a projection Ml thereon operates an air valve M<SP>2</SP> allowing air to enter valve E and valve I to restore their pistons to their original positions.