Patent GB-860267-A (GB)
Title: Improvements in tabulating mechanism for typewriter or like machines
IPC: B41J21/14
Filed: 1957-05-17
Abstract: 860,267. Typewriters &c. ROYAL McBEE CORPORATION. May 17, 1957 (Aug. 6,.1956], No. 15826/57. Class 100(4) In a tabulating mechanism having a series of stops 23, Fig. 1, on the stationary frame, which are power operated and key controlled, and a further series of stops 7 on the movable carriage, the stops on the frame are mounted in a subsidiary carrier which is biased towards the stops on the movable carriage when the power operated stops are in their retracted position. This bias is rendered inoperative when the power operated stops are set so that the subsidiary carriage mounting the latter stops never fails to be displaced, to reset the tabulation mechanism, unc'er the impact of a stop on the movable carriage at the end of a tabulation run. Depressing a key 30, Fig. 1, rocks a lever 32 and operates a link 34, a lever 36, and a link 38 to move the stop device 23 to an intermediate position in which an edge 43 is above a bail cam edge 42a. Continued depression of key 30 will cause a finger 72 to rock rod and arm assembly 73, 74 to move a pawl carrier 66 counterclockwise to engage a pawl nose 69a with a snatch roll 65. Roll 65 wil) now drive the pawl 69 and carrier 66 forwards to operate a lever 44, a link 46 and a shaft and bail assembly 41, 42 to move the stop setting bail edge 42a into engagement with the edge 43 of the stop device 23 and cam the stop into fully projected position 231, Fig. 5, in which its upper portion is in the path of stop 7<SP>1</SP>. At the same time an arm 50 on a shaft 41 will operate a rack releasing lever 51 to disengage a rack 12 from an escapement pinion 18 and enable the carriage to perform a tabulating run. The rocking of shaft 41 also moves a latch arm 55, Fig. 1, into engagement with nose 53b and debiasing nose 63c of biasing lever 63 to rock the latter and disengage contact part 63b on the lever 63 from contact part 58c on a carrier arm 58, thereby removing the bias from the carrier and conditioning it to be moved freely to the left. When the carriage approaches the end of a tabulation run the stop 71 engages a stop 23 and moves the latter together with the rest of stops 23 and the carrier 24 towards the left until arrested by engagement of the carrier frame side 26a with frame part A1. Since this leftward movement of the carrier 24 and stops 23 takes place without restraint of a biasing spring 61 movement of the carrier and stops is insured even though the carriage has performed only a short tabulating run and has acquired only a small amount of kinetic energy. Leftward movement of the carrier 24 causes resetting part 58b on the arm 58 to press against resetting part 60 on latch 53 to rock the latch anticlockwise and release the latch arm 55, thereby permitting arm 55 and associated parts to be returned to their normal positions by spring 48. Clockwise rocking of bail 42 urged by spring 48 releases stop 23 to be returned to its normal position by spring 27 and if the stop is not fully returned by spring 27 the lower edge of bail 42 engages a surface 43a to rock the stop back to retracted position. Restoration of latch arm 58 to its normal position by spring 48 also reactivates biasing lever 63 and spring 61 to cause contact part 63b to press against contact part 58c on arm 58 and move carrier 24 and stops 23 toward the right until arrested by engagement of carrier frame side 26b with fixed frame A2. Rocking of shaft 41 by spring 48 when arm 55 is unlatched will deactivate the escapement releasing lever 51, Fig. 5, and the machine will then be in condition for typing or further tabulation operations.