425,690. Typewriters &c. BURROUGHS ADDING MACHINE CO., 2nd Boulevard, Detroit, Michigan, U.S.A. Sept. 20, 1933, No. 26001. Convention date, Oct. 6, 1932. [Class 100 (iv)] Paper feeding and guiding arrangements; papersupports; feed-roller rotation for blanking; linespacing mechanism ; web-cutting arrangements. A calculating or like machine comprises a rotatable platen about which a record sheet may be held, a work-sheet holding-means independent of the platen and movable from open to closed throat-position and vice versa, means co-operating with the platen to form a second work-sheet holding-means, a printing- mechanism, and means operable automatically in a predetermined operation of the machine to move both the work-sheet holding-means simultaneously to open-throat position together with a single means for moving them both back to closed-throat position. Provision is also made for front-feeding a work sheet, printing on it twice and cutting off a strip, for line-spacing a record sheet, for interlocking the keys which initiate the different operations, and for using the machine as an adding machine. The machine is provided with amount keys 1, Fig. 1, which set stop-bars 2, racks 3, and through them, registers and type-bars 4. Total and sub-total keys T and ST and operating-keys No. 1, No. 2, are also mounted on the keyboard. The platen 10, Figs. 10, 14 is mounted on side plates 11, 12 forming a frame swinging about an axle 13. The platen frame is supported in open-throat position by a toggle-joint 16, 19 between the frame and a fixed plate 18, and is always urged towards that position by a spring 15. A hand-lever 21 returns the platen to printing position, where it is latched by an arm 24 engaging a shoulder 27 on the frame. A record strip 40 is fed from a roll 41 round the platen, to which it is pressed by a spring-pressed roller 47, over an autographic table 42, and to a take up roll 43. Both rolls 41, 43 and roller 47 are mounted to move with the platen frame, the rolls 41, - 43 in a locked casing 50. A front-feed table 55 for a work-sheet or bill W is pivoted to a stationary part of the carriage and has slotted arms 57 engaging studs 58 on the platen frame so that, when the platen is rocked back, the table moves to a position to guide the worksheet between the platen and an apron 59 and between feed-rollers 60, 61. Rollers 60, 61 are mounted respectively on the fixed plate 18 and on an arm 62 pivoted about the axle 13 and controlled by a spring 63. The roller 61 is held out of contact with the roller 60 by a latch 65 engaging a shoulder 64 on the arm 62. The latch 65 is part of a pivoted yoke 66, Figs. 10, 14, 15 with a spring-pulled arm 68 and an abutment 70 engaged by an arm 71 of another yoke 72. The yoke 72 has an arm 74 with a cam surface 75. When the platen frame is being returned to printing position, the surface 75 wipes over a stationary pin 76, rocks the yoke 72 anti-clockwise, Fig. 14, and allows the yoke 66 to rock to release the arm 62. The rollers 61, 60 then grip the worksheet W before the platen and hold it against displacement. As the platen comes into printing position, the surface 75 passes the pin 76 and permits the re-latching of the arm 62 to the frame, ready for the next platen rocking. Arms 80 pivoted to a stationary plate 84 have downwardly bent parts 81 lying in annular grooves in the rollers 61 and acting as a stop to position the work-sheet when it is introduced. When the platen is returned to printing position, the arms 80 are raised by a pin on the platen frame, so as to permit feeding of the work sheet. Depression of key No. 1 (1) starts the machine operation, including a printing operation ; (2) locks the platen in printing position ; (3) places the machine in non-add condition ; (4) feeds the work-sheet ; (5) locks the amount keys and key No. 1. For these purposes the following arrangements are provided :-(1) The shank of key No. 1, Fig. 19, depresses an arm 90 which depresses a slide 93. The slide 93 has an arm 96 which depresses a pin 97 carried by an arm 98 which controls the driving motor, or enables the use of an actuating-lever to give one cycle of operation ; (2) A link 100 connects the pin 97 to a bell-crank lever 101 adapted to intercept a dependent lug 103 on a spring-drawn slide 29, which engages the lower end of the platen release lever 24. Depression of key No. 1 thus prevents platen release and, conversely, if the platen is in rockedback position the lug 103 intercepts the lever 101 and prevents depression of key No. 1. ; (3) Key No. 1 rocks another arm 105 which disables a pawl 108, thus " non-adding " the machine ; (4) A pin 117 on the arm 90 is engaged by the forked end of an arm 116, whose other end restrains a stud 118 on a spring-urged yoke 119. The yoke is pivoted to a pivoted sector-arm 112 and has a shoulder 129 adapted to engage a pin 128, Fig. 8 on a pivoted arm 126. Mounted on the main driving-shaft 6 is a cam 122 and connected to this cam is a link 123 to which the arm 126 is connected by a link 125. The link 123 also operates a bell-crank 124. A gear wheel 110 is mounted on the axle of the roller 60 and is engaged by a toothed sector 111 on the end of arm 112. During the first cycle of operation (initiated by key No. 1) the link 123 is moved rearwardly and then forwardly; during the forward motion the pin 128 engages the shoulder 129, which has been released by the rocking of lever 116, and rocks the sector arm 112, thus feeding the work-sheet independently of the platen. A latch arm 130 then engages a pin 120 on the arm 112 and locks the arm in forward position. (5) Normally, the amount keys are latched depressed by bars 140, and are released during the cycle of operations by a rocking lever 141 actuated by a sliding plate 145, which is pressed forward by a pin 147 on the cam 122 and raised by a spring 107 so as to engage the lever 141. When key No. 1 is depressed a pin 153 on arm 90 rocks a lever 154 and a pin 156 restrains the plate 145, so that it engages the lever 141 with a step 157 which does not move it sufficiently to release the amount keys. Key No. 1 is also latched depressed, but is allowed to rise sufficiently to prevent a second operation cycle. Depression of key No. 2, (1) releases key No. 1. (2) initiates a second operation, including a second printing ; (3) cuts off the stub of the work sheet, which carries the first impression ; (4) linespaces the record-sheet; (5) releases the platen and returns work-sheet feeding means to normal. For these purposes the following arrangements are provided :-(1) Key No. 2 is not locked by the bar 140, since the shank engages a wide cam slope 158, Fig. 1 on the bar, carries it back and thus releases key No. 1. The plate 145 is thereby released so that the amount keys are unlatched at the end of the cycle of operation. (2) The key depresses a slide 245, Fig. 8, which engages a stud 93<a> on slide 93, and thereby initiates a machine cycle and also maintains the platen lock but does not non-add the machine. Key No. 2 also rises sufficiently after depression to prevent a second cycle of operation. (3) Mounted on the carriage are a sliding knife 165 and a fixed knife 166, Figs. 10, 14 and 15, between which the sheet w is guided by plates 135. Knife 165 is depressed by arms 171 mounted on a shaft 172 and oscillated by an arm 201. The bell-crank 124 engages an arm 173, Fig. 8, of a yoke which is provided with other arms 176, 177, Fig. 16 engaging a stud 178 which actuates the printing mechanism. A second yoke is pivoted on the same axle 175 and has arms 182, 183, engaging the stud 178 and carrying a pendant arm 185 respectively. The pendant arm 185 has a shoulder 186 and cam-faces 187, 188. Also mounted on the arm 183 is a link 200 pivoted to the arm 201. When slide 245, Fig. 8, is depressed by key No. 2, an arm 190 rocks a lever 191, whose other arm carries a pin 193 which rocks a yoke 195, Fig. 15, carrying a pin 198 adapted to rock the pendant arm 185. When the pendant arm is rocked the shoulder 186 engages the stud 178, which can then rock the arm 183 and actuate the knife 165 to cut off the stub 5, which receives the first impression made during No. 1 operation and which falls into a locked container. The stud 178 and arm 182 return the parts to rest position. (4) Pivoted on the platen frame is an arm 212 carrying a platen-feed pawl 211 and a stud 216 which engages a slot 217 in the link 200. During the forward motion of the machine, the pawl is drawn back and, during the rearward motion, it line-spaces the platen and record sheet. The upright curved portion of the slot 47 permits the rocking movement of the platen. (5) A lever 221 forming part of a yoke 222 is adapted to engage a pin 220 on the platen-release slide 29. Pivoted to the yoke is a latch 225 with a shoulder 226 adapted to engage a pin 227 on the rocking member 126. Normally, engagement is prevented by a stud 228 on the yoke 195 which depresses the latch 225, but, when the yoke 195 is rocked, the engagement takes place and, during the return stroke, the platen is released for removal of the worksheet. During the return movement, an abutment on the latch 225 engages a dependent arm on the latch 130 and thereby releases the sector arm 112, which returns to normal under its spring 114. To prevent the engagement of shoulder 129 and stud 128 interfering with this movement, the shoulder is temporarily cammed out of the way by engagement of a spring-pressed pawl 242 with a pin 241 on the yoke 119. Date-printing mechanism is incorporated in the machine. The machine can be used as an adding-listing machine by using key No. 2 only. In this case the printing and other mechanism operates once only for each depression of the key, and does not feed an inserted work-sheet rearwardly. To prevent the automatic platen-rocking after each operation, the pin 120 on the arm 112 is adapted, when the arm 112 is in the rearward po