Patent GB-669625-A (GB)
Title: Justification device for photographic type-composing machines
IPC: B41B27/32
Filed: 1949-10-13
Abstract: 669,625. Photographic type - composing. HIGONNET, R. A. E., and MOYROUD, L. M. Oct. 13, 1949, No. 21141/60. Divided out of and addition to 669,532. Class 98 (i). In a justifier for a photographic typecomposing machine of the kind described in the parent Specification, the selector means comprise a stepping switch 171 having a, plurality of contacts TO-T20 arranged in sets or levels R1-R10 and a number of brushes 178-1 to 178-10 (one for each level) adapted to be moved, during composition of a line and under the control of the primary counter, to a final position spaced from a terminal contact TO in each level by a number of contacts equal to the line deficit in elementary width units; the interword counter 175 being adapted, during photography of the line, to energize the brushes selectively in accordance with the number of interwords in the composed line; and the brushes being adapted to traverse the contacts during photography of the line, the contacts of the switch being interconnected in groups with the variable advance mechanism for the light-sensitized surface so that when a contact in a level is met by an energized brush, the light-sensitized surface is advanced by an appropriate distance to form the desired interword. The switch 171 is moved by a solenoid-operated ratchet and pawl or the like controlled by the line counter; the arrangement being such that when the line reaches a minimum length during composition, the brushes, starting from contacts T20, move towards contacts TO in steps corresponding to the length of the line in minimum width units in excess of the minimum length, so that at the end of the line the brushes are spaced from contacts TO by a number of contacts equal to the line deficit D in minimum width units. The brushes 178-1 to 178-10 are connected to a stepping switch 175 (the interword counter) the brush of which is stepped from one contact to the next each time the space bar is pressed during composition of a line. The contacts ofswitch 171 are interconnected in groups, as shown, which are connected by wires a0 ... a5 to the variable advance mechanism EV. This mechanism advances the light-sensitized sur, face by i minimum width units when energized by wire a0, and by i+1, t+2, ... units when energized by wires al, a2, ... The exciting circuit runs through switches 175, 171, wires aO ... a5 to the variable advance mechanism EV, and thence to an earth return through a switch closed by a cam Ca during the appropriate part of the cycle of operation of the machine, and a switch R closed by the register whenever an interword space is to be recorded. In the example shown, switches 175, 171 are in the positions reached after composing a line with seven interwords and which is 15 units short, the positions of brushes 178-1 to 178-10 being shown in dotted lines. When, during photography of the line, the first interword is reached, switch R is closed by the register, and at the appropriate instant cam Ca completes the circuit through contact 7 of switch 175, brush 178-7, contact T14 of level R7, wire a3 to the variable advance mechanism EV, which operates to advance the lightsensitized surface by (i+3) units. The brushes of switch 171 are then stepped to contacts T14, so that when the next interword is reached the circuit is completed through contact T14 of level R7 through wire a2, and the surface is advanced by (i+2) units. A similar advance is effected for the remaining five interwords. In general,. the deficit D is distributed as evenly as possible between the interwords. At the end of the line switch 175 is stepped on until it returns to its zero position. It is possible also to arrange for the brushes 178-1 to 178-10 to move by a number of contacts equal to the number of units by which the interword is increased, and for the switch 175 to move back a step at each interword. This would bring the action of the selector into closer analogy to the action of the selector of the parent Specification, but would have the disadvantage that it is more difficult to design switch 175 to be stepped in both directions.. Specification 669,531 is also referred to.