Patent GB-1056302-A (GB)
Title: A selector mechanism for moving the type body of an electrically controlled printer
IPC: H04L17/24
Filed: 1964-05-29
Abstract: 1,056,302. Selective-printing machines. MITE CORPORATION. May 29, 1964 [June 14, 1963], No. 22463/64. Heading B6F. [Also in Division F2] A type-carrying member of an electrically e.g. computer, controlled printer is moved to select a particular type face for printing by means of a continuously-oscillating lever connected to the type member and a number of fulcrum pins for the lever, one or other of the pins being moved into the path of the lever so that the movement of the type-member is such as to position the required type face at the printing position. FITST EMBODIMENT. Type selection.-As shown in one embodiment, Fig. 1, a four-sided type cylinder 62, ten characters long, is slidably mounted on a square shaft 64 for selecting a circumferential row of characters and for letter spacing, the shaft being rotated to select the required character from the circumferential row. For the latter purpose, the shaft 64 is rotated by a belt 68 against the action of a restoring spring 66. The belt 68 passes over a pulley 72 on a lever 76, and a pulley 74 on a lever 78, and its end is secured to a fixed pin 92. The levers 76, 78 are oscillated once for each printing cycle by a linkage 84, 86, 90 and eccentric 82 from a main shaft 80. Each lever 76, 78 is notched for engagement with one of four pivot pins 99<SP>1</SP>, 961, 93<SP>1</SP>, 94. In the initial position with one longitudinal row of type lying along the printing line, the levers swing about fixed pins 94 near their upper ends and no movement of the pulleys 72, 74 on the belt 68 occurs. For turning the shaft 64 to present the next longitudinal line, electromagnets 104 are engaged to move two pins 93<SP>1</SP> one for each lever axially into the path of corresponding notches 93 in the levers. The levers now pivot about the pins 93<SP>1</SP> which with their notches 93 are so disposed that a differential movement of pulleys 72, 74 occurs causing the belt 68 to turn the shaft 64 through 90 degrees. Similarly, projection of the pins 96<SP>1</SP>, 99<SP>1</SP> cause the shaft 64 to be rotated through 180 degrees and 270 degrees respectively. A similar arrangement of levers 106, 108, pulleys 122, 124 and belt 158 is provided for selecting the axial movement of the type cylinder except that ten pins and ten notches are necessary. Further, since the type cylinder has to be letter spaced, the belt 158 is connected indirectly to the type cylinder as will now be described. Letter spacing.-The selecting belt 158 is connected to a pulley 128 around which passes a belt 138 connected at its ends to a spring 156 and a drum 140. Intermediate its ends the belt 138 has secured thereto a yoke 132 connected by a sleeve 130 to the type cylinder. A ratchet wheel 144 on the shaft 142 of drum 140 is rotated for letter spacing by a pawl 146 cam-operated from the main shaft 80. Hammer impression is effected by a spring 182 attached to an arm 178 secured to the hammer shaft 166 and controlled by a cam 180 on the shaft 80. The hammer 162 is letter spaced, being carried by a sleeve 164 slidable on a square shaft 166, the sleeve being attached to a spring-retracted belt 170 passing over a pulley 174 and drum 176 fixed to the shaft 142. Carriage return.-Energizing of an electromagnet 184 causes withdrawal of pawl 146 and a retaining pawl 154 from the ratchet wheel 144 thus allowing carriage return by the spring 156 to take place. Multiple printing units; printing cylinder construction.-A second printing cylinder 194 is connected to the sleeve 130 so as to partake of the movements of the cylinder 62. The cylinders 62, 64 are for printing on a sheet 60 and a passbook 192 respectively. Each circumferential row of characters of the cylinder 194 is movable as a unit at right angles to the shaft 64 for printing as described in Specification 1,002,120, the hammer 198 therefor being attached to the sleeve 164 of hammer 162. Driving arrangements.-The main shaft 80 may be rotated half revolutions on a stopstart basis, being intermittently driven from a continuously rotating shaft 186 through a halfrevolution clutch mechanism controlled by an electromagnet 190. SECFND EMBODIMENT. Type selection.-In a modified construction, the notches of each pair of associated selection levers face in the same direction and the operative ends of the levers e.g. 310, 312, Fig. 7, are connected to the ends of a belt 366 passing over a pulley 360, Fig. 9 (not shown). The pulley 360 is attached to a pulley 396 around which passes a belt 382 connected at one end to a spring drum 392, Fig. 7, and at the other end to a drum 402 operated for letter spacing by a pawl 404. Intermediate its ends the band is connected to the type cylinder 370. Different movement of pulley 396 effects axial selecting movement and a similar arrangement effects circumferential selection. Letter spacing; carriage return.-The pawl 404, Fig. 12 (not shown), which rotates the drum 402 for letter spacing is formed on a long strip 440 connected to a lever 448 oscillated by a cam 452. A check pawl is pivoted at 490. A magnetically-operated lock 453 may be operated to hold the cam follower 450 of lever 448 in its outer inoperative position when the machine is idling. A pin 488 on a lever 486 overlies the pawls and is moved downwardly to release them for carriage return when a magnetically-operated lock 481 is actuated to release the lever 486 for operation by a cam 480. The pawls when released are held by a hook 494 but at the beginning of the typing of the next line the hook 494 is disengaged by a pin 497 on the hammer action. Hammer action.-The hammer 430, Fig. 9, is moved against the action of a spring to effect an impression, by the downward movement of a hook 468 engaging an arm 466 on the hammer, the hook being cammed off the arm 466 at the end of the stroke. The hook 468 is actuated by a lever 464 oscillated by a cam on the main shaft. The hammer is moved for letter spacing by a band 436, Fig. 7, passing over a drum fixed to drum 402. Hammer, letter spacing and ink-ribbon feed suppression may be effected whilst the machine is idling by magnetic locks such as the lock 453, Fig. 12, for the letter-spacing lever 448.