Patent GB-410381-A (GB)
Title: Improvements relating to power actuated tabulator mechanism for typewriting and like machines
IPC: B41J25/18
Filed: 1933-09-07
Abstract: 410,381. Typewriters &c. REMINGTON TYPEWRITER CO., Ilion, New York. U.S.A.-(Assignees of Hart, F. A.; R.F.D. A87, Fallbrook, California, U.S.A.) Sept. 7, 1933, No. 24868. Convention date, Sept. 24, 1932. Addition to 395,555. [Class 100 (iv).] Relay tabulating-mechanism.- In the key-controlled cam mechanism for selectively operating tabulating-stops described in the parent Specification, the cam is provided with a long dwell for delaying return of the selected tabulating-stop and restoration of the carriage to control of the escapement until the carriage has finished rebounding and has come to rest in correct position. A lock may be provided for preventing operation of the numeralprinting keys until the selected tabulating-stop has returned. The mechanism shown in the Figure comprises, as described in the parent Specification (1) denominationstop levers 14 abutting on slides 16 operated by bell-cranks 53 carrying links 60 resting on slides 62 operated by the denomination keylevers, (2) a universal bar 63, for selectively operating the links 60, secured to arms 82 on a shaft 85 and provided with a roller 89 cooperating with a cam 91 which is mounted loosely on a driving-shaft 93 and is provided with a pawl 96 for co-operating with a toothed wheel 94 fast on the driving-shaft, and (3) carriage-releasing mechanism connected by linkage 40, 35 to a universal bar operated by the denomination-stop levers. The cam is now provided with a dwell 103 which runs into a drop 104, and extends over approximately half the circumference. The pawl 96 cooperates with two tripping-arms 100, 101 forming part of a bell-crank 133 which is connected to a spring-urged link 135. A pin 142 on the link is arranged in the path of a universal bar 139 which engages notches 141 in the slides 142. Each link 60 has a shoulder 64 which overlies the universal bar 63 when the latter is operated. On depression of any denomination key, the selected slide 62 and link 60 are lifted, the universal bar 139 raises the link 135, the bell-crank 133 is rocked, and the arm 100 is released from the pawl. Thereupon, the pawl engages the toothed wheel 94, and the cam, after making a quarter-revolution, is arrested by co-operation of the arm 101 with the pawl. During revolution of the cam, the universal bar 63 co-operates with the selected link 60, the selected denomination-stop lever is operated, and the carriage is released. When the carriage is arrested by the denomination stop lever, the operator releases the denomination key, and the cam completes a revolution and is again arrested by co-operation of the arm 100 with the pawl. During revolution of the cam, the dwell 103 prevents return of the universal bar 63, and the shoulder 64 prevents the link 60 from dropping. By these means return of the denomination-stop lever, and restoration of the carriage to control of the escapement are delayed until the carriage has finished rebounding and has come to rest in the correct denominational position. When the drop 104 engages the roller 89, the parts are permitted to return to normal position. The link 60 is positively returned by means of a spring-urged universal bar 143. To prevent the pawl-spring 99 from turning the cam 91 when the pawl is held in released position by the arm 100 or 101, another cam 105, attached to the cam 91, is provided with projections 108, 107 co-operating with a roller 109 on a spring- urged bell-crank 110. The denomination-stop levers and the slides 16 are preferably mounted in a frame section 12 which is hinged to a frame section 50 supporting the driving-shaft and associated parts, including the bell-cranks 53. To prevent injury due to accidental interference of the bell-cranks and slides when the section 12 is turned downwards, the slides 16 are mounted on rods 18 secured to a yoke 19 which is pivoted to a housing on the frame section 12, and is held in contact with pins by means of springs. The yoke 19 is formed with combs 20, 21. The denomination stops may consist of slides engaging the upper ends of the denomination - stop levers. Specification 374,109 is referred to. Key locks.-To prevent operation of the numeral-printing key-levers until the selected denomination-stop lever has been returned, and the carriage has been restored to control of the escapement, the numeral-printing key-levers are associated with a locking-device which is operative during the time that the denomination stop is projected and the carriage is released. The locking-device preferably consists of a rocking blade which is arranged to enter a channel containing balls, and is connected by linkage to an arm 148 operated by an arm 146 in connection with the carriagereleasing link 40.