Patent GB-144651-A (GB)
Title: Improvements in and relating to the paper carriages of typewriting machines
IPC: B41J19/74
Filed: 1920-06-07
Abstract: 144,651. Hillard, F. W. June 15, 1916, [Convention date]. Paper-carriages; platen-shift mechanism. - A paper-carriage comprising outer and inner members 43, 45, Fig. 30, the inner member 45 having case-shift movements, is arranged so that it can be swung upwards when in predetermined endways positions for inspection, repair, and cleaning, and can be locked in the raised position. The movement may be effected when the carriage is in either or both extreme positions, the parts being made right, left, or double handed, as required. During the upward movement of the carriage the carriage rack is withdrawn from the escapement pinion, and in order to prevent endways movement of the carriage by the driving- spring, especially when the carriage is in the extreme right-hand position, three stop devices are arranged to come into operation successively as the carriage is swung upwards. In the preferred arrangement, the carriage is hinged on a truck 40 mounted between upper and lower rails 55, 56, ball or roller bearings being provided in raceways on the parts. The outer carriage member 43 is hinged by rearwardly projecting lugs 44 upon a shaft 42 carried bv end brackets on the truck. The inner carriage member 45 is made fast to the shaft 42 by pinning the usual shift-arms 46 to the ends of the shaft; the usual open bearings in the shift-arms receiving studs on the inner carriage member are closed over by caps to maintain the parts in fixed relation. Lifting movement of the carriage is normally prevented as usual by a locking-finger 50 underlying the upper front rail 52, a notch 82 being provided for the passage of the finger. The finger and notch serve also as the first stop device for preventing endways movement. The second stop device is associated with the finger 96 which, in conjunction with the guide-wheel 97, locks the carriage upon the shift-rail 95, the end 98 of which is cut away or flattened to release the finger in the required endways position of the carriage. The finger 96 is formed with a projecting lug 99, and a fixed stop plate 100 is provided for engagement by the lug 99 in any shift position of the inner carriage member. The third stop device is a locking- finger 105 on the shaft 42 adapted to engage a projecting arm 106 on the upper rail 55. These stops come into and out of operation successively and overlap in action. To prevent obstruction by the second stop device when lowering the carriage, the stop plate 100 is bevelled on its upper edge to cam the finger 96 aside. To prevent any binding of the guide-wheel 97 on the shift-rail when the latter is in upper-case position, the finger 96 is provided on one side with a roller for engagement with the top of the shift-rail. To prevent any possibility of the finger 96 locking above the shift-rail under abnormal conditions of the parts, a tongue 104 is provided, projecting over the shift-rail in position to prevent the finger from passing entirely over the rail and to cam the finger clear of the rail on elevation of the rail or by slight jarring of the carriage. The means for locking the carriage in the raised position comprises the back rod 108 on the inner carriage member supporting the usual marginal paper guide, and bevelled studs 111 attached to the end brackets 54 supporting the rails 55, 56. The studs are recessed, the rod 108 finally snapping into the recesses and locking the carriage members together with the inner member held firmly in upper-case relation. The studs are adjusted by spacing-washers to vary the grip on the rod 108. The ball or roller bearings for the truck 40 preferably comprise three elements 58, Fig. 8, arranged as described in Specification 156,112. The travelling bearing-cage member 60 carries a pinion 62 engaging between an upper rack on the truck and a lower rack on the lower raceway rail 56. Paper-feeding arrangements; paper-scales; inkribbon mechanism.-The paper-feed plate under the platen is provided with camming projections for forcing back the paper-scale to clear the paperfeed rollers, and for forcing back the ink-ribbon away from the paper-clip when the carriage is being lowered. Slots for inspection of the work are provided in the paper-feed plate, and extend at the front ends in advance of the paper-feed rollers. The line-spacing device may be arranged on the right-hand side, in which case the link between the key and the bell-crank of the releasing-devices for the paper-feed rollers is provided with a projection for camming the paper-scale outwards to clear the bell-crank. The Specification as open to inspection under Sect. 91 (3) (a) describes also a margin stop and a carriage brake. This subject-matter, which now forms the subject-matter of Specification 156,112, does not appear in the Specification as accepted.