Patent GB-468054-A (GB)
Title: Improvements in or relating to calculating and the like machines
IPC: B41J11/48
Filed: 1935-09-21
Abstract: 468,054. Typewriters &c. BURROUGHS ADDING MACHINE CO. Sept. 21, 1935, No. 26235. Void. Convention date, Sept. 22, 1934. [Class 100 (iv)] Sheet-feeding arrangements ; paper-supports; column-printing arrangements.-In a calculating or like machine having a front-feed throat and column-printing means, the throat is controlled independently of the columnprinting means. In the preferred arrangement, the platen is automatically lifted, to provide a throat, while the platen-carriage remains stationary. The mechanism includes, as described in Specification 382,613 a bail which is raised to separate the platen and feed-rollers, thereby providing a front-feed throat, by means of a roller on a slide in connection with a bellcrank which is operated by a spring and is returned by a snail-cam on a one-revolution shaft, the slide being normally locked by a latch arranged in the path of releasing-studs on the bail. The mechanism is associated with tabulating-mechanism comprising tabulating-stops 122, Fig. 11, carried by a rock-shaft on the carriage and adapted to be released successively from an abutment 121 by mean of a pawl 127 on a reciprocating slide 124. Each tabulating- stop, on moving into contact with the abutment, rides over a nose 135 on a bell-crank 130 pivoted on the abutment, and thereby moves an arm of the bell-crank away from a pin 134 to permit of the pawl engaging the tabulating-stop. For causing the carriage to remain stationary in a predetermined column position, the ordinary tabulating-stop is replaced by a special stop 1122 which is so formed as to avoid contact with the nose 135. When the special stop moves into contact with the abutment, the bell-crank 130 remains in contact with the pin 134, the pawl is unable to release the special stop, and the carriage remains stationary. The carriage is released by depressing the total key, a bell-crank 146,operated thereby being connected by a link 147 to the bell-crank. During the cycle following depression of the total key, the pawl is permitted to engage the special stop, and the carriage is released and moves to the next column position. A number of special stops may be employed but usually one is placed in the last column position so that in the cycle following depression of the total key the carriage moves slightly to the left and is then automatically returned. For automatically closing and opening the front-feed throat while the carriage remains stationary, the throat-control bail 25, Fig. 7, is operated by means of a roller 72 which is mounted directly on the cam-and-spring operated slide 150, the pivoted roller-support described in the above-mentioned Specification being omitted or, alternatively, fixed to the slide. A latch 151 for holding down the slide is released by means of a finger-piece 154 or automatically by means of studs 110 on the bail. When the carriage is stationary in a column determined by the special stop 1122, the slide, having being released by means of the finger-piece or the stud, is raised and the frontfeed throat is opened, and on return of the slide the throat is closed. The operation is repeated during any desired number of cycles. In an alternative arrangement, the latch 151 is automatically released during descent of the bail 25 by co-operation of a stud thereon with a cam face on the side of the latch. The stud can be pushed inwards when out of use, a spring clip being provided for retaining the stud in operative or inoperative position. In the mechanism shown in Fig. 13, for automatically closing and opening the front-feed throat in any selected column position, the slide 150 carrying the roller 72 is held down by a latch 151 having an arm 161 in the path of a spring-urged hammer 186 which is normally restrained by a latch 182. A stud 181 on the latch 182 co-operates with a pawl 180 on a slide 179 connected to a bellcrank which abuts on another bell-crank operated by an auxiliary motor-bar overlapping the main motor-bar. When the auxiliary motorbar is depressed, the slide 179 is depressed idly, and in the initial part of the subsequent cycle the slide 150 is depressed and latched, and the frontfeed throat is closed. After printing has been effected, the auxiliary and main motor-bars return, the slide 179 moves upwards, the hammer is tripped and releases the latch 151 and the slide 150 is raised to open the front-feed throat. The hammer is returned by means of a bellcrank 192 co-operating with a stud 190 on the slide 150. If the auxiliary motor-bar is depressed while the tabulating-mechanism is operative, the front-feed throat is opened during movement of the carriage. To permit of the carriage remaining stationary while the front-feed throat is closed and opened, the bellcrank operated by the auxiliary motor-bar is arranged to depress a slide 201, Fig. 11, cooperating with a lever 205 in conection with a slide 207 for moving the pawl 127 and thereby disabling the tabulating-mechanism. If it is not desired to disable the tabulating-mechanism, a stud is removed from the slide 201 to avoid operation thereof by the bell-crank. If the front-feed throat is closed when the auxiliary motor-bar is depressed, the throat is opened and again closed during the following cycle.