Patent GB-322141-A (GB)
Title: Improvements relating to tabulating mechanism for typewriting machines
IPC: B41J11/24
Filed: 1929-03-04
Abstract: 322,141. James, R. W., (Remington Typewriter Co.). March 4, 1929. Tabulating - mechanism; back-spacing mechanism; carriage -re turning mechanism. - Tabulating- mechanism comprising a mutilated feed - rack for permitting the carriage to jump from one columnposition to the next is associated with means for back-spacing the carriage from the column positions and thereby enabling one or more characters to be typed in advance of those positions. The back-spacing means may comprise an auxiliary feed-rack which is automatically engaged with the carriage-feed pinion when the carriage is in a column position. When poweroperated carriage-returning mechanism is employed automatic means is provided for disabling the auxiliary rack during carriage-return. In the mechanism shown in Figs. 2 and 5, a mutilated feed-rack 27 and an auxiliary rack 41 co-operate with a feed-pinion 14 connected to a back-spacing wheel 12 which co-operates with a pawl operated by a back-spacing key 15, and is coupled by a pawl to an escapement wheel 11 co-operating with dogs 9, 10. The escapement wheel is coupled to the pinion 14 for letterspacing but remains stationary during backspacing. The rack 27 is secured to a cross-bar 29 which is carried by pivoted arms 30 on the carriage 6 and is provided with a stud 37 normally resting on a lug 38. The rack 41 is secured to brackets 44 which are secured to blocks 46 on a rack-shaft 47 on the carriage. Springs 36, 51 hold the racks in normal position and the racks are lifted for carriage-release by means of a lever which engages the rack 27 and is operated by a carriage-release lever, a pin 35 on the rack 27 co-operating with a slot 53 in the rack 41 to couple the racks during the release movement. The rack 27 is formed at intervals with one tooth or a group of teeth, the intervals corresponding in length to the space between the final and initial characters in successive columns on the bill or the like for which the rack is designed, and the number of teeth in a group being equal to the number of characters to be typed across the corresponding column. A bar 54, mounted on trunnions 57, 68 on the framework 1 and urged forwards by a spring 66, is formed with a number of cam-projections 70 which correspond in length to the intervals in the rack 27 and are each formed with an incline 69, and a bevel 71 having a vertical edge. The cam-projections cooperate with a block 76 which is secured to the rack 41 and is formed with an incline 77. When a bill is typed, the intervals in the rack 27 permit the carriage to jump from one columnposition to the next, and the teeth control letterspacing within the columns. During letterspacing, the rack 41 is disengaged from the feedpinion by means of the inclines 69, 77, and during the jump between columns, the block 76 rides on one of the cam-projections and maintains the rack in disengaged position. At the end of the jump the block drops into one of the gaps 80 between the cam-projections and the rack re-engages the feed-pinion. If it is now desired to type one or more additional characters in advance of the column position determined by the rack 27, the back-spacing key is operated one or more times before typing is commenced, movement being transmitted to the carriage by means of the rack 41. During back-spacing, the bar 54 is moved rearwards and retained by co-operation of the block 76 with the bevel 71 and face 72 on one of the cam-projections, the bar being thereby prevented from disengaging the rack 41 from the feed-pinion. In machines provided with totalizers, the back-spacing movement places the totalizer for any column in correct position with respect to the master wheel. The carriage is associated with the carriage-returning mechanism described in Specification 247,144 and comprising a motor 82 for driving a shaft 86 geared to the carriage, stops on the carriage operating a rack-shaft 92 provided with a bellcrank 90 for operating a clutch 91 and a contactarm 96. To prevent the rack 41 from being raised and dropped by the bar 54 during carriagereturn, the bar is provided with a bracket 127, Fig. 2, having pin-and-slot engagement 126 with a link 124 which has pin-and-slot engagement 122 with an arm 120 on the shaft 92, the arrangement causing the bar to be moved rearwards during carriage-return.