Patent GB-220234-A (GB)
Title: Improvements in carbon paper conserving devices for use upon typewriting and similarmachines
IPC: B41J17/00
Filed: 1924-02-04
Abstract: 220,234. Carpmael, A., (Champion Consercei- Co.). Feb. 4, 1924. Carbon-sheet holders.-A carbon-paper conserving device for attachment to the paper carriage of a typewriter or like machine comprises a frame carrying a roll of carbon-paper mounted to enable it to be inserted between paper sheets already positioned in the machine. The attachment comprises a lower U-shaped member consisting of a horizontal portion 5, Fig. 1, with two short vertical arms 6 which are provided with recesses 7 at their upper ends to form pivotal bearings for headed studs 16 on the sides 15 of a swinging frame-member consisting of a base bar 14, a crossbar 17, and the vertical side members 15. The attachment is mounted upon projecting arms 1 which are secured by clips 3 to a bar B on the rear of the carriage. An antifriction roller 10 mounted on the underside of the bar 5 bears upon a track rod 11 carried by arms 12 screwed upon the machine frame A. The spool carrying the carbon roll C may be supported in bearing slots 26 in the upper ends of the bars 15 to facilitate interchanging. Attached to the middle of the bar 17 is an upwardly extending resilient arm 40 bent at its free end to hold a rod 41 carrying rubber surfaced rollers which bear against the carbon roll to prevent accidental unwinding. A tensioning and rewinding spring 38 may be secured at one end to a head 37 on one of the spool spindles, the other end being secured in a clip 39 on the side of the frame. Teeth 18 are provided along the lower edge of the bar 17 to facilitate the tearing of the carbon sheet. The swinging frame carrying the carbon spool may be held in either a vertical or an inclined position bv a catch member formed like an inverted U which is hinged in a bearing 19 near the centre of the horizontal bar 14, and is arranged so that its arms such as 21 hang down on either side of the bars 14, 5 to hold the frame vertically, or the catch can be adjusted so that when the frame is inclined the end of the arm 21 is engaged in a notch 22 in a bar 8 secured in front of and parallel to the bar 5. When the machine is not in use the swinging portion can be folded upon the carriage. In a modification for use in a machine wherein the entire carriage moves vertically for case-shift, the weight of the attachment is counterbalanced by mounting the track roller upon a bowed spring which is secured at one end only on the underside of the bottom horizontal bar. The carbon roll is preferably wound on a core 27, Fig. 9, provided with one or more notches 28 at each end. This core is supported on end pieces consisting of cylindrical members 35, Figs. 6 and 7, attached to large discs 31 which are secured upon headed axial spindles 32. Lugs 36 are provided in the cylindrical heads 35 to engage within the notches 28 in the core 27. A modified spool, as shown in Fig. 10, comprises a spindle 52 with a detachable head 53 at one end, and at the other end a fixed head 54 provided with inwardly extending resilient fingers 55 to grip the inside of the carbon roll. The spindle 53 is provided with a spring-pressed keeper 26 to exert a braking action on the spindle.