Patent GB-762899-A (GB)
Title: Improvements in work sheet feeding and positioning mechanism for typewriters or like machines
Filed: 1954-06-15
Abstract: 762.899. Typewriters. ROYAL McBEE CORPORATION, [formerly ROYAL TYPEWRITER CO., Inc.]. June 15, 1954 [Aug. 11, 1953] No. 17578/54. Class 100(4) A work sheet feeding and posi tioning mechanism for a type writer &c. comprises a work sheet feeding member 2, Figs 1, 8, a work sheet associating member B mounted for move ment to a set-up position and to a working position, work sheet end indicator mechanism C, means for operating that mechanism in response to operation of the feeding member, and control means 55 effected by positioning of the associating member in its set-up position for immobilizing the indicator mechanism against being driven in response to operation of the feeding member. There is a friction drive transmission between the feed member and the indicator mechanism The control means 55 is positioned to lock or to free the indicator mechanism by a part 64 operable by movement of the associating member. Platen 2 is turned by means of knob 21 which acts via a clutch ring and coupling disc, line spacing increments being determined by a ratchet mechanism including a ratchet wheel fast with the clutch ring. By pressing button 31 inwardly the coupling disc and clutch ring are disengaged so that knob 21 can be used to turn the cylinder fractional amounts. Line spacing may also be effected by power driven means co-operating with the ratchet wheel. The pivoted bail 34 is normally held in the working position by spring 39, but may be pulled forwardly to the set-up position, as in Fig. 1, when a work sheet W is to be inserted, and again is held in this position by spring 39. The bail may also be swung to an upper position. Mechanism C includes an indicator drum 46 which is pressed against the coupling ring by a frictional drive transmission washer, is provided with scale markings 50 co-operating with a reference slate 52, (not shown), and has a groove 53 to receive the nose 54 of control pawl 55 pivoted at 56. An anti repeat line spacing camplate is also pivoted on screw 56. Pawl 55 which is urged clockwise (Fig. 1) by spring 62 is held in a raised inoperative position by cam plate 64 when bail 34 is in the working position, but when the latter moves to the set-up position plate 64 moves away from pawl 55 which is then pulled into groove 53 in drum 46, and when the drum reaches the starting position the nose 54 of the pawl enters a notch in groove 53 and prevents movement of the drum. With the drum in the starting position, the work sheet W is arranged so that its bottom edge registers with a datum mark 68 on a flange 67 on the paper table 45, when the machine is then operated, pawl 55 being rendered inoperative by movement of bail 34 to the working position, the drum 46 rotates with the platen 2 and indicates the amount of space remaining for receiving typing. The datum flange may be retractable, as in Fig. 9 so as not to interfere with the paper, particularly during reverse feeding. When bail 75 is moved forwardly to the set-up position it operates through 78, 79, 82, to raise the guide member 72 from its lower position to one in which the datum edge 74 projects through a slot 71 in the paper table 69. Bail arm 76 may be equipped with a roller 83 adapted to rest on a fixed track 84.