Patent GB-223866-A (GB)
Abstract: 223,866. Rockford Milling Machine Co., (Assignees of Sundstrand, 0. J.). Oct. 25, 1923, [Convention date]. Aligning for impression.-According to the Specification as open to inspection under Sect, 91 (3) (a), and in a single-bank key-set leveroperated adding and subtracting machine in which the item-printing type-bars 3, Fig. 1, are controlled in their differential upward movements by a field of stops 42 selected and protruded by the keys in a known manner, the aligning blade 276, Figs. 12 (Cancelled) and 15 (Cancelled), carried by pendant arms 278, 279 is drawn by a spring 281 towards engagement with notches 277 in the front edges of the typebars and is positively controlled in the opposite direction by a slotted bar 282 to which the spring is connected. A pin 288 on arm 278 is normally blocked by a detent 286 connected bv a spring 289a to a second detent 289 pivoted at 285 coaxially with a lever 284 supporting the bar 282. In the forward stroke of the operating lever the pin 37 moves to the right, Fig. 12 (Cancelled), and striking the lower arm of the lever 284 withdraws the bar 282 towards the left, the aligner meanwhile being held out of action by the detent 286. At the end of this stroke, the pin 37 rocks the detent 289 to raise the detent 286, the pin 288 then being received and held by the detent 289. At the beginning of the return stroke, as soon as the pin 37 leaves the lower arm of the detent 289, the pin 288 slips between the detents and the aligner consequently is drawn into engagement with the notches 277. Subsequently, the pin 37 leaves the lever 284 and the spring 281 acts to advance the bar 282 to disengage the aligner. Hammer-impression arrangements.-The types are struck by hammers 300, Fig. 1, each pivoted on a rod 141<b> and urged to effect impression by means of a spring 301. The hammers are restored by a rod 302 supported by a spring-controlled bell-crank lever 304, Fig. 10 (Cancelled), pivoted at 305. The lower arm of a lever carries a roller 307 co-operating with a cam plate 308 fixed to the rock arm 25 oscillated by the main operating lever. The surfaces 311, 312 on the plate cause the lever 304 to rock first anticlockwise and then back again at the end of the forward and beginning of the return stroke. Pivoted at 315 on each hammer is a latch plate 314, Fig. 9<b>, tending to turn anticlockwise to engage by a pin 316 at its rear end the forward edge of the corresponding type-bar. Near the end of the forward .stroke the latch plates are permitted to rock to feel the edges of the type-bars, then differentially positioned, but otherwise they are restrained by a universal bar 319, Fig. 1, supported by pivoted plates 320 bifurcated to be rocked in timed relation by the rod 302. To prevent displacement of the bar 319 before the type-bars are in correct position, the plates 320 are normally held by latches 324, Fig. 3, engaging pins on the plates until by the ascent of the rod 302 the latches are displaced and the plates rocked to free the latch plates from the restraint of bar 319. A universal bar 329 positively holds the lugs 303 of the hammers until by the movement of the main operating-mechanism acting through a pin 341, Fig. 10 (Cancelled), a catch 336 and a latch member 333, the first-named forces the bar 329 to release the hammers, this occurring at the beginning of the return stroke. To the right of the type-bars is a special bar 3<1>. Fig. 3, provided with two sign-printing types, the upper denoting when printing in red a total and in blue a non-added item, and the lower in red a negative balance and in blue a subtracted item. The selective positioning of the bar 3<1> is determined by a lever 222, which has a shoulder presenting either of two surfaces 297, 298 to a pin 296 on the bar. Thus when the lever is shifted to adjust the machine for subtraction the surface 298 stops the pin, but otherwise the surface 297 is effective. Normally the bar occupies the position for printing the total and non-add signs and the latch 314 restrains the corresponding hammer to prevent an imprint. When the total or non-add key is depressed, however, a finger 344 extending from the bell-crank 261 blocks a pin 345 on the latch which consequently is disabled so that the hammer is free to strike the type. This subject-matter does not appear in the Specification as accepted.