Patent GB-179210-A (GB)
Title: Improved apparatus for printing and copying music and the like
IPC: B41J3/34
Filed: 1920-11-09
Abstract: 179,210. Walton, T. Nov. 9, 1920. Machines with types separate for writing music; hammer-impression arrangements; cases h i f t mechanism. - Loose type-members are mounted in a magazine which is movable mechanically to bring the selected type-member to a fixed position, and is associated with a device for positively gripping and removing the selected type-member and conveying it to the printing point. To permit the employment of a large number of types, each type-member may be formed with a number of types which are selected by subsidiary shift-mechanism. In the machine shown in Figs. 1 and 2, an arcuate magazine 50, revoluble horizontally about a pin 52, carries loose type-members 73, and is movable differentially, to bring the selected type-member to the middle position, by depressing keys 53. The hey-levers 55 engage levers 54 having inclined ends engaging a lever 61, pivoted on a stationary pin 63 and having a forked end 64 in engagement with a pin 65 carried by an arm 62 on the magazine. Or, the levers 54 may engage an arm on a pinion meshing with a pinion on the magazine. The selected type-member is removed from the magazine, and swung upwards for impression on a platen 7 by means of a printing-member or hammer 58 pivoted at 72 and operated by an impression-key 79. The hammer carried a loose sleeve 74a which is moved endways to grip the type-member, by means of a cam-groove 76 and a co-operating pin 75 on the sleeve. The impression-key may operate, by means of linkage 81, a wedge 83 engaging the tail 85 of the hammer, or may operate a lever engaging the tail. The typemembers may be formed with three types 86, 87, 88, and the hammer may be caused to present any of these types at the printing point by adjusting the pivot 72 of the hammer by means of a lever 89. The magazine may comprise a number of separate tiers adapted to be coupled to the keyboard by means of a fork which can be raised to engage any of the tiers, the fork being also arranged to raise the hammer. The tiers are formed at the middle with a slot for the passage of a type-member selected from one of the lower tiers. In the machine shown in Fig. 16, the type-members 135 are mounted loosely by means of projections 145 on the periphery of a revoluble magazine or drum 123 provided with a pinion 130 engaging segments 125 which are rocked differentially by key-levers 55. The impression key 79 operates, by means of linkage 138, 139, a rocking and sliding sleeve or hammer 140 engaging grippers 136. On depressing the impression-key, the sleeve causes the grippers to seize the selected type-member and swing it upwards for impression. In the machine shown in Fig. 18, the type-members 135 are mounted in trays on the faces of a bar 150 which can be turned by means of a knob 152 to bring one of the trays to the top, and can be moved axially by means of keyboard mechanism. The selected type-member is seized by grippers 136, engaging rollers 153<a> on a rocking and sliding member 152<a> operated by the impression-key. To prevent detachment of the type-members at the sides and bottom of the bar 150, the typemembers are formed with pins which pass through holes in the trays and engage keyhole slots in a locking-plate, or fingers on a locking- bar. The locking-plates or bars are held in locking position by springs, and are moved longitudinally by a cam to release the set of typemembers at the top of the bar. Paper-supports; platen rotation for writing music. The paper-carriage 3, Figs. 1 and 2, is formed with arms 5, 6 supporting a platen bar 7 having a slight rocking movement limited by stops 8, 9. The paper passes over the platen bar and is mounted on a support comprising segments 4 secured to a rock shaft 10 which is differentially revoluble, by means of keys 103, to position the printed notes on the stave. For this purpose, the rock shaft is provided with an arm 14 engaging a fork 18 on a slide 20 connected to a rack 117 which is geared to a ratchet-wheel 109 co-operating with a pawl 116 carried by a slide 114. The keys 103 operate levers engaging the slide, and operate also, by linkage 106, 107, a masking-plate 108 for determining the active throw of the pawl. The pawl and masking-plate may be arranged to co-operate directly with the rack 117. The paper-support can be rotated, independently of the keys 103, by means of thumbwheels 10<a>, or by means of a hand-lever 24 which is coupled by linkage to the slide 20. In a modified mechanism, shown in Fig. 19, for rotating the paper-support in either direction, a rack on the paper-support engages a worm 170 which can be coupled by clutches 171 or 172 to pinions 163 or 164 engaging racks 161, 162 carried by a rack 160 operated differentially by the keys 103. The paper-support shown in Fig. 18 consists of a drum 154 which may be rotated by pawl-andratchet mechanism, the setting being indicated by a pointer. The paper passes over a stationary platen bar 155. The drum is provided with a blanket of rubber, cardboard or the like, which may be secured to the drum by a clamp 178 and a ratchet stretching-device 180. According to the Provisonal Specification, the drum may be provided with a pinion engaging a pinion which can slide on a square shaft, geared to a hand-wheel which is set with reference to a pointer. Sheet-clamping arrangements; line-spacing mechanism.-In the apparatus shown in Fig. 16, the paper is secured to a clamp 149 movable laterally for line-spacing, the movement being limited by an adjustable stop 148. The stop and clamp engage a serrated bar 149<a>. Platen-shift mechanism. - The platen drum 154, Fig. 18, can be moved from the normal position into either of two shift positions by means of a hand-lever 156 connected to supports 158 for the drum. Letter-spacing and back-spacing mechanisms. -A rack 28, Fig. 2, on the paper-carriage 3 cooperates with fast and loose dogs on a rocking plate 32, the loose dog being arranged to slide in a slot. The spacing is varied by means of an adjustable stop which determines the normal position of the loose dog. The rack may cooperate also with a back-spacing pawl. The platen-rotating mechanism shown in Fig. 19 and described above may be adapted for use as a differential letter-spacing or back-spacing mechanism. Ruling-devices.-A stave-ruling wheel 50<a>, Figs. 1 and 2, and inking-rollers 52<a> therefor aremounted on a pillar 51<a> and can be swung into' operative position by means of a handle 53<a>.