Patent GB-692477-A (GB)
Title: Duplicating ribbon attachment
IPC: B41J35/35
Filed: 1949-07-08
Abstract: 692,477. Typewriters &c. HOCHMAN, J. C. July 8, 1949 [July 9, 1948], No. 18169/49. Class 100(iv) Ink-ribbon mechanism; sheet feeding and guiding arrangements. -A ribbon carrier frame for holding one or more ink ribbons along the printing line of a front-feed bookkeeping machine has retaining means coacting with conventional parts of the machine whereby it may be readily mounted and removed; means may be associated with the ribbons to facilitate the front insertion of forms. The frames shown are generally in the form of curved end arms 57, 113, 173, 205 riveted to a spring metal angle bar 52, 103, 191; platenlength ribbons (see below) are retained on the reduced ends 116 of the arms by lock shoulders 117, Fig. 12. In Fig. 4 spring steel form insertion guides 67, 68, 69 are riveted to the left hand or both arms 57, the intermediate guide 68 being double to straddle the front ribbon 92: its front limb forms with the front guide 67 a passage to feed a form in front of this ribbon and behind the movable deflector plate of the bookkeeping machine which extends from beneath the platen in front of the lower end 75 of the guide 67; its rear limb forms with the rear guide 69 a passage to guide a form between the ribbons 91, 92; the form beneath the rear ribbon 91 is fed into the machine before the frame is applied to the platen. Where more than three forms are to be printed; additional ribbons and intermediate guides 68 may be provided. To enable all parts of the ribbons to be fully used, collars on the bail rod of the machine, which engages notches 59 in stiffening ledges 58 to hold the frame in position, allow one type space play longitudinally, while the notches 59 are slightly wider than the bail rod to give vertical play; the ribbons may also be inverted. In the form shown in Figs. 10 and 12, applicable to a machine having a transparent plastic front plate 136 and a paper table 138 both movable towards each other to form a front feed throat, and a bail rod 132 and supporting rod 134 mounted on common pivot arms, the frame has hangers 109 'and spring clips 111 to engage the rod 134 and stops 115 to engage the rod 132; for front feed the front ribbon holders 145 may swing out from the Fig. 10 to the Fig. 12 position, for which purpose they have spring steel levers 152 engaged by the plate 136 and are hinged to curved extensions 141 of the arms 113, the outer hinge pins 146 being further from the platen than the inner hinge pins; if more than three forms are to be printed the holders 145 may carry more than one ribbon 155 and may be provided with form guides 67, 68, 69 as in Fig. 4; in a modification the parts 141, 145 are of spring steel and are integral, a fold replacing the hinge. Single-ribbon devices are also described having frames as in Fig. 12 but with the extensions 141 and parts mounted thereon omitted: in one form an intermediate ribbon guide arm is provided slidable along the bar 103 and having a slotted end through which the ribbon 156 passes; in another form, Fig. 17, the ribbon is mounted on the end of an inclined lateral wing 174 extending from each end arm 173 and inserted between the head 181 of an indicator plate pivot pin and the beveled end 179 of the platen; in another form, Fig. 19, the end arms 205 have upwardly extending attachment arms 198 and are articulated at 213 to facilitate insertion between the platen 184 and an obstructing rod 187 of a machine with under-striking type heads 183. Ink-ribbons.-The platen-length ribbon, Fig. 20, has an impervious backing and its ends, which have parallel longitudinal slits 64, 65 for mounting, may be reinforced by impervious fabric tabs 63.