Patent GB-402484-A (GB)
Title: Improvements in ink ribbon mechanism
IPC: B41J35/30
Filed: 1932-06-10
Abstract: 402,484. Ink-ribbon mechanism. ROYAL TYPEWRITER CO., Inc., 2, Park Avenue, New York, U.S.A.-(Assignees of Myers, L. C. ; 20, Wilson Place, Freeport, and Handley, G. F.; 7030, 83rd Street, Glendale, both in New York, U.S.A.) June 10, 1932, No. 16480. Convention date, June 25, 1931. [Class 100 (iv).] Ink-ribbon mechanism, particularly for use in duplicating-arrangements for typewriters, comprises one or more spools mounted on a shaft provided with spool-brakes and releasing- means therefor, or comprises a number of spools associated with brakes and simultaneousrelease means therefor, or comprises means for locking the spools before or on completion of the feed-movement of the ribbons to hold taut the ribbons and thereby prevent them from being dragged by the papers during line-spacing movement thereof. The manifolding- attachment for typewriters shown in Figs. 1 and 4 comprises, as described in Specifications 276,995, [Class 100 (iv), Typewriters &c.], and 367,768, feeding-means L for a number of ribbons K which are guided along the front of the platen C and are interleaved with webs H, the platen-carriage B being provided with a hand-lover 41 for operating the feeding-means L, and line-spacing mechanism for the webs. The ribbon spools S are revoluble on a shaft e fixed at the front in a frame F comprising front and rear plates a, b, and braces c, d, the rear plate having an opening for permitting removal of the spools. The frame is connected to the carriage B and is provided with a roller 14 running on a rail 10 secured to adjustable brackets 11 on the framework A of a typewriter. Each spool is, as shown in Figs. 17 and 18, formed with internal teeth 77 and a groove 76 co-operating with a locking-dog 84 and a spring - urged brakeplunger 93 which are mounted in a groove 81 and a recess 80 respectively. A rock-shaft 99 mounted in the shaft e is formed with grooves 100, 101 receiving lugs 86 on the locking-dogs, and heads 96 on the brake-plungers respectively. Normally the brake - plungers engage the spools, and the locking-dogs are held in disengaged position by the shoulder 102 of the groove 100. An arm 109, Figs. 4 and 16, on the shaft 99 carries a pivoted latch 121 having a shoulder 120 engaging a lug 116 on a loose arm 113. A roller 128 on the arm 113 engages a cam-slot 127 in a rocking plate 125 having a pin-and-slot connection 133 to a bell-crank 134 which is connected by linkage 135-140 to a bell-crank 143 operated by the cam 49 on the line-spacing lever 4 . When the line-spacing lever is operated, the arms 113, 109 are swung downwards, the shaft 99 is rocked anti-clockwise and, before completion of the ribbon-feeding movement, the shoulder 103 moves the locking-dogs into engagement with the spools. The remainder of the ribbon-feeding movement is effective to remove slack from the ribbons and thereby prevent them from being dragged upwards by the webs during line-spacing movement thereof. To permit of removal of the spools, the locking- dogs and brake-plungers are retracted into the spools by rocking clockwise the shaft 99 and thereby causing the shoulders 102, 104 to engage the lugs 86 and heads 96. For this purpose, a loose bell-crank 149, co-operating with a lug 122 on the latch 121, is connected by a link 150 to an arm 153 on a rock-shaft 146 provided with a hand-lever 154 in the form of a plate. The rear end of the shaft e is normally supported by engagement of the coned end thereof with a hole in the hand-lever. On depression of the hand-lover, the bell-crank 149 is rocked clockwise, the latch is released from the lug 116 and engaged with a lug 112 on the arm 109, and the shaft 99 is rocked clockwise to retract the locking-dogs and brake-plungers, and thereby permit of the spools being moved axially along the shaft and removed from the machine. On return of the hand-lever the locking-dogs and brake-plungers are restored to normal position. The hand-lever has a cam lip 157 which rides over the coned end of the shaft e when the hand-lever is depressed or returned. The hand-lever is locked in normal position by co-operation of a hole therein with a spring- plunger mounted in a barrel 159 on the frame F. The spring-plunger is releasable by means of finger-operated plate 166 which is pivoted at 167 to the hand-lever 154 and has an aperture co-operating with the coned end of the spring- plunger.