Patent GB-522333-A (GB)
Title: Improvements in printing machines
IPC: B41K3/08
Filed: 1939-01-06
Abstract: 522,333. Typewriters. MURCHISON, B. K. Jan. 6, 1939, No. 541. [Class 100 (iv)] Type-wlteel machines; index setting arrangements justifying.-In, a line-printing machine, type-members loosely mounted on a shaft are set successively by means of a member carried by and longitudinally movable on the shaft, and are locked successively by another longitudinally movable member and, after impression, are restored by means of a member rotatably mounted on the shaft. The type-members may be provided with means co-operating with the shaft for moving the type-members longitudinally to effect justification. Means. may also be provided for printing in page-form on a sheet, and in lineform. on a proof-strip, and for inking and cleaning the types. In the machine shown in Figs. 1, 2 and 3, type-discs 33 are mounted on a shaft 32 which is supported in bearings 30 on the base 31, and is provided with a hand - wheel 39 having index-characters 40 which are set with reference to apointer 41. 'Each type-disc is formed with a slot 34, Fig. 7,. for engaging a key 3.7 formed on a setting-bar 36 which is mounted in one of a series of longitudinal grooves 35 in the shaft. The typediscs are arranged between a revoluble head 91, and a movable head 92 having stop-rods 93 for co-operation with, an abutment 94 which is adjustable, in accordance with the length of the line, on a guide. 95.. 'The grooves 35, except the one occupied by the key 37, are normally filled by bars 83 on a head 84 revolubly connected to a rack 85 co-operating with a pinion operated by a crank 90. The setting-bar 36 isconnected to a collar 56 revolubly mounted in a sleeve 44 which can slide on the shaft 32 and is connected by a latch 66 to a bar 64 mounted in guides 63 and adapted to engage notches arranged between the types on the type-discs. A pawl 45 on the collar engages a rack 46 which is reciprocated by means of a hand-lever 60 on a shaft 59 having an eccentric pin co-operating with a pocket in the rack. During each operation of the handlever, the bars 36, 64 receive a movement towards the right-hand equal to half the thickness of a type-disc. An arm 125 co-operates with stops to limit movement of the hand-lever. A locking-. tooth 43 for the hand-wheel 39 is moved into engagement with one of a series of notches 42 therein by means of a cam 120 on a sleeve 118 having lost-motion engagement with the shaft 59. To provide for justifying the line, each type-disc is provided with a loose ring 71, Fig. 7, which is arranged in a recess 69 and is retained by clips 70, a spring 74 normally holding the ring eccentrically to the shaft 32. Each ring supports spring-urged pawls 77, 78 and is provided with spring-shoes 81 for co-operation with inclines 80 on the associated type-disc. The key 37 passes through recesses 76 in the rings. Initially, the key engages all the type-discs, and the bar 64 is out of engagement. To compose a line, the type-discs are set successively by turning the hand-wheel 39 and, after each setting, the handlever 60 is. operated twice to move the key out of engagement with the set type-disc and its ring 71, and to move the bar 64 into engagement with the set type-disc. The hand-wheel is provided with types 100 for printing a proof of the line on a strip 103. When a type-disc corresponding to the end of a word has been set, the hand-wheel is slightly turned before the second operation of the hand-lever, and a cam 72 on the ring 71-of the type-disc co-operates with one of the clips 70 to displace the ring and thereby bring the pawls, 7778 into position for engaging the grooves 35. The crank 90 is then operated to withdraw the filler-bars 83 and permit the pawls to engage the grooves. The shaft 32 is then turned, and the spring-shoes 81 of the rings that have been coupled to the shaft ride up the inclines 80 and force the adjacent type-discs towards the right-hand to justify the line, the justification' movement being limited by the stop 94. When an imprint has been made from the set line on a sheet supported by a platen-roller 130, the shaft 32 is turned to restore the rings 71 to their original position, determined by stops 75, the bar 64 is unlatched and returned to the starting position, the filler-bars 83 are moved into the grooves 35, and the head 92 is moved to bring the type-discs into contact. The type-discs are then restored to initial position, this being determined by co-operation of teeth 166 on the type-discs with a plate 167 which is moved into the path of the teeth by means of a hand-lever 171. The type-discs are restored by co-operation of the teeth with a plate 178 pivotally mounted on a bar 175 which is secured to the head 91 and a disc 174. The plate can be placed in neutral position, or with the edge 179 or 180 in the path of the'teeth by means of an arm 181 having a spring-pin 182 for engaging holes 183, 184, 185 in the head 91. To restore the type-discs; the edge 180 is moved into position for engaging the adjacent teeth 166, and the disc 174 is rotated slightly. After return of the disc, the edge 179 is moved into position, and the disc is given a full revolution to bring the teeth into engagement with the plate 167. On return of the disc, the arm 181 co-operates with a dog 186 to restore the plate to neutral position. The rack 46 is then depressed slightly by means of a knob 49, and the key 37 is returned to normal position by turning a crank 55 in connection with a pulley 54 which engages a cord 51 connected to the sleeve 44. Aligning for impression.-The type-discs 33, Figs. 1 and 3, are aligned initially by,the bar 64, and digit errors are corrected, before impression, by means of an aligning - bar 161 which is mounted in brackets 160 and is moved into the spaces between the types by means of spring hooks 165 on levers 127. Hammer-impression arrangements; letter-spacing mechanisms.-The proof-strip 103, Figs. 1 and 2, and. an interwound carbon-strip are fed from a reel 123 and through a guide 99 by means of feed-rollers 105, Fig. 23, on.a shaft 106. A ratchetwheel 112 on the shaft co-operates with a threetoothed star-wheel 113 on a shaft provided with a six - toothed ratchet - wheel 114 co-operating with a pawl 115 on the hand-lever 60. A hammer 109a is mounted in a cylinder 109 secured to the arm 108 of a bell-crank 107 having another arm 110 co-operating with the star-wheel 113. During the first operation of the hand-lever, the feedrollers 105 are operated to letter-space the proofstrip, and the bell-crank 107 is rocked forwards in opposition to a spring, 111, and during the second operation of the hand-lever, the bellcrank is swung rearwatds by the spring, and the hammer 109a effects impression from one of the types 100.  Platen-impression arrangements; line-spacing mechanism.-A sheet, on which matter is typed line-by-line, is secured by clamps 131, Figs. 1 and, 3, to a roller 130 mounted on a shaft 133 which is carried by three-armed levers 127 secured to a shaft 129. The., levers carry a platen-bar 126 and are connected to toggle-arms 150 on a shaft 148 provided with a hand-lever 149. A ratchet - wheel' 134 on the roller cooperates with pawls 136 on a swinging frame 135 which is connected by a spring 138 to an arm 137 on the shaft 129 and is provided with a pin 141 for co-operation with an abutment 142. When the hand - lever is raised, the roller is swung 'forwards to effect impression from the type-discs 33, and the pawls are retracted, and on depression of the hand-lever, the roller is returned and the pawls turn the roller to line-space the sheet. The abutment 142 is adjustable, to vary the line-spacing, by means of a knob on a threaded shaft 144 having a scaledrum 146 which is read by a pointer 147. To provide for single, double &c. line-spacing, one of the pawls 136 is selected by means of a manually-adjustable slide 158.  Roller inking-arrangements.-The type-discs 33 are inked by means of a roller 206, Fig. 3 and 30, mounted on bell-cranks 203 carried by blocks 201 which are secured to a cross-bar 201 connecting slides 200. The blocks support a distributing-roller 207 and slides 210 which support another distributing-roller 211. Springs 208, 212 hold the rollers in contact. A stationary rack 213 co-operates with a pinion 214 on the roller 207, and stationary cams 218 and pins 220 cooperate with pins 219 on the slides 210, and fingers 205 on the. bell-cranks 203 respectively. The slides 200 are operated by a forked arm 223 on 'a shaft 222 provided with a plate 232 having an adjustable tooth 233 and cam 234 for co-operating with a dog 229 which is pivoted on a plate 228 on the shaft 129 and is formed with a cam 235. When the hand-lever 149 is raised, the dog 229 and tooth 233 co-operate to raise the slides 200, the roller 207 is rotated, and fingers 204 on the bell-cranks 203 co-operate with cams 216 to swing the roller 206 into contact with the type-discs before impression occurs. The cam 234 then lifts the dog 229 into contact with a stop 231, and the cams 234, 235 co-operate to depress the slides 200. When the slides approach their low position, the rollers 206, 211 are separated from the roller 207 by means of the pins 220 and cams 218, and the roller 207 is moved into contact with an inking - roller mounted in an ink-trough 197. On return of the hand-lever 149, the inking-roller is turned by means of a pawl 240 carried by a rock-arm 239 engaging the arm 223. Types, cleaning.-A tank 188, Figs. 2 and 3, containing a felt roller 190 and a distributing-roller 189, is supported by spring-urged rock-arms 191 and is normally held in depressed position by a catch 194. On release of the catch, the roller 190 moves into contact with the type-discs 33, and the types can be cleaned by rotating the hand-wheel 39.