Patent GB-362500-A (GB)
Title: Improvements in and relating to typewriting machines, typewriting-calculating and like machines
IPC: B41J11/14
Filed: 1930-09-05
Abstract: 362,500. Typewriters &c. MERCEDES BœROMASCHINEN - WERKE AKT.-GES., Benhausen, Post, and K€MMEL, H., 6, Am Bahnhof West, both in Mehlis, Zella, Thuringia, Germany. Sept. 5, 1930, No. 26544. [Class 100 (iv).] Platen-shift mechanism; sheet feeding and guiding arrangements.-To facilitate front feed of sheets or cards to the platen of a typewriter or like machine, means are provided for simultaneously disabling the shift-stop, and moving the platen and the paper-holding devices to an abnormal position; these means may be arranged also to move relatively the platen and the paper-holding devices, and to operate keyboard-locking devices. In the arrangement shown in Fig. 1, the platen frame 5 is mounted to shift in the carriage 3 and has a rail 6 running on a roller 8a carried by a member 8 operated by the shift-keys, the shift movement being limited by means of stops 31 which cooperate with arms 30 mounted on the axles 29 of the platen 4. An ink-ribbon vibrator 13 and a printing-line indicator 9 are carried by the member 8. Shafts 17, 25 on the platen frame are provided with arms 19, 26 connected by links 23, a bar 14a connecting the arms 26 normally engaging a hook 14 on the member 8 and coupling the member to the platen frame. To raise the platen frame abnormally, and thereby permit of front feed of sheets without interference by the vibrator and printing-line indicator, the shaft 17 is rocked by means of a crank 18. The bar 14a is released from the hook 14 during the initial movement. During the subsequent movement of the crank, rollers 22 carried by the pivoted connections 21 of the links 23 and arms 19, ride on plates 27 on the carriage, and the platen frame is raised, cams 23b on the links 23 displacing the arms 30 during the final part of the movement. A latch 34 co-operates with a pin 40 on the crank to hold the platen frame in raised position. The latch can be released by means of a key 39. Feedrollers 45, 46 are mounted on spindles carried by arms 49, which are connected by a spring-supported cross-bar and engage bell cranks 43 on a shaft 41 supported by the platen frame. An apron 55 is pivotally mounted on bell cranks 44 on the'shaft 41, springs holding the front of the apron in contact with the platen. The bell cranks engage recesses in the shaft 25, and on movement of the crank, the apron and the feed-rollers 46 are separated from the platen. The feed-rollers 45 remain in light contact with the platen and serve to hold a record sheet whilst permitting of front feed of a bill. The record sheet is held at the front of the platen by means of adjustable fingers, and a spring-urged bail 64, Fig. 10, which is raised to permit of insertion of the record sheet. The bill is held at the front of the platen by means of fingers 72d pivoted to sleeves 72a adjustable on a spring-urged bail 67 which is raised to permit of front insertion of the bill. The fingers have extensions 72f overlying the bail 64. Adjustable sideguides for the bill are carried by the bail 64. Locking-devices.-When the platen frame 5, Fig. 1, is raised by the crank 18, the keyboard of the machine is locked and the type-levers are thereby prevented from being injured by striking the anvil. As applied to a calculating machine comprising interconnected typing and calculating key-levers 147; 134, Fig. 11, raising of the frame is arranged to lock both sets of key-levers. The key-levers 134 work in a comb 133 containing loose rollers 135, a rocking arm 132 being provided for moving together the rollers and thereby locking the key-levers. A similar arrangement of rollers controlled by a rocking arm 146 is provided for the key-levers 147. The rail 6 engages a spring- urged lever 90 co-operating with a lever 98 engaging a lever 107. A rod 110b engaging the lever 107 rests on a bell crank 115 connected by an adjustable link 123 to the arm 132. The lever 107 engages an arm 144 connected to the arm 146. When the platen frame is raised, the lever 90 is rocked, the arms 132, 146 displace the rollers, and the keylevers are locked.