Patent GB-261629-A (GB)
Title: Improvements relating to platen carriages for typewriting machines
IPC: B41J11/02
Filed: 1926-06-01
Abstract: 261,629. James, R. W., (Remington Typewriter Co.). June 1, 1926. Paper-supports; line-spacing mechanism.- The platen is mounted in an open bearing in the carriage and is retained by a pivoted bracket which supports the entire line-spacing mechanism excepting the ratchet-wheel, the bracket being turned away from the bearing when it is required to detach the platen. The carriage plates 1, 2, 3 have open bearings 7, 11 receiving hubs 8, 13 on the platen 10, detachment of the platen being prevented by a bracket 33 which is pivoted on a shaft 65 and carries the entire line-spacing mechanism excepting the ratchet-wheel 26. The bracket is normally in the horizontal position and is secured by a spring-latch 74 which is pivoted on an extension 77 of the plate 2 and has a shoulder 74a for engaging the bracket. The plate 2 has a pin 2a for engaging a hole 33<a> in the bracket. The hub 8 is held down by a lug 71 on an arm 68 pivoted to the plate 2 and abutting on the bracket, a lug 73 on the bracket lifting the arm when the bracket is moved to the position shown in Fig. 2 to permit detachment of the platen. The hub 13 may have a reduced part 13<a>, Fig. 5, carrying a loose sleeve 14 formed with a collar 15 entering the bearing 11, and a tongue 16 entering the narrow mouth 12 of the opening. To permit detachment of the platen, the bracket is moved into the position shown in Fig. 2, the hub 8 is raised slightly to release a groove 23 therein from a plate 24, and the platen is then moved to the left until the collar 15 is released from the bearing 11. The line-spacing mechanism mounted on the bracket 33 may comprise a pawl 27 pivoted at 28 to a slide 30 guided by a slot 31 and screw 32 and having a short slot 40 engaging the end 39 of a pin 36 on the line-spacing lever 34. A pin 44 on the pawl engages the upper edge of a member 45 pivoted at 46, engagement being maintained by contact of the pin 36 with a spring-pin 37 mounted in the path above the pivot 28. The member 45 determines the point of engagement of the pawl and ratchetwheel 26 and is adjustable to vary the spacing, being maintained in adjusted position by a means of an arm 48 pivoted at 49 and having a pin 51 for engaging one of a number of notches in the bottom of the member. The arm 48 has a fingerpiece 58 and a flange having the marks 1, 2, 3 which register with the pin 44 to indicate the spacing. At the end of the spacing movement the pawl is locked bv contact of an inclined face thereon with an extension of the pivot 46. A detent-roller 61 co-operating with the ratchetwheel is carried by a spring-pressed arm 62 on the plate 2, a stop 62<a> limiting the movement of the arm when the platen is detached. To prevent obstruction of the ratchet-wheel when the platen is moved longitudinally to seat the collar 15 in the bearing 11, a wide detent-roller is employed. Platen-roller couplings. - The line-spacing wheel 26, Fig. 3, may be provided with a coupling releasable by pulling out the platen knob 81, a latch 83 for retaining the knob in displaced position being mounted on the bracket 33 and formed with a nose 89 adapted to engage a collar 91 on the hub of the knob. The latch has slots engaging guide-screws 66, 87 on a flange 82 on the bracket, and is moved by a finger-piece 88. The latch is pressed against the flange by a spring 86 and is retained frictionally in the normal or displaced position. If the latch is inadvertently moved to the forward position when the knob 81 is in normal position, the latch is, on pulling out the knob, moved to normal by co-operation of the collar 91 and an incline 92 on the nose 89. Sheet-feeding arrangements. - Feed-rollers 94 are mounted on a rod 93 carried by arms 95 pivoted to extensions 77. 77a of the carriage plates 2, 3, catches 98 pivoted on the plates normally engaging hubs 97 on the arms to retain the feedrollers in engagement with the platen. When the feed-rollers are out of use the arms are swung forwards and rest on a bracket 99 on the top plate 100. The catches are connected to springs 101 and have arms 104 normally abutting on the above described hub 8 and sleeve 14. When the platen is inserted in the carriage, the hub and sleeve engage the arms 104 and the catches are moved into position for engaging the hubs 97 when the arms 95 are turned backwards.