Patent GB-629975-A (GB)
Abstract: 629,975. Typewriters &c. MONROE CALCULATING MACHINE CO. July 10, 1947, No. 18387. Convention date, July 7, 1943. [Class 100 (iv)] [Also in Group XIX] A motor-operated adding and listing machine comprises spring-operated printing hammers and cyclic operating means, including a main clutch, differentially setting type members during the first half of a cycle and causing restoration during the last half of the cycle and is characterized by a lever settable to effect disengagement of the main clutch in half-cycle position and to activate normally inactive reprint controls operable to repeatedly engage an auxiliary clutch driving an arm which tensions and releases the printing hammers, and a pawl arranged to operate after a given number of operations of the auxiliary clutch to re-engage the main clutch. The invention, which provides for repeatedly printing an item in several columns (as required, e.g. in preparing public utility statements) is described as a modification of the machine described in Specifications 389,630, 389,632, [both in Group XIX], and 406,152. The digit keys 215, Fig. 2, when depressed, are latched down to provide abutments limiting the advance of differential stop bars 615 which are connected to members 610 controlling the position of the type bars 611 and entry into the totalizers 472 in known manner. The machine cycle is initiated by depression of a key 138, Fig. 1, which disengages a latch 148 from a spring-urged lever 150, whereby the lower arm of the latter releases a spring-urged clutch pawl 153 to engage a notched disc 157 driven from the motor 48 through gears 50. The lever 150 also engages a stud 160 on a lever 61, causing an insulated roller 63 to close contacts completing the motor circuit. For repeat printing a lever 101 is adjusted to its forward position which moves the opposite end of the lever clear of a lug 104 on a spring-urged bell-crank 103 bringing the lug into the path of the clutch pawl 153 and causing disengagement of the main clutch immediately after the release of the printing hammers 715. A rearwardly extending arm of the lever 101 carries a pin 107, Fig. 2, controlling the latch 702<SP>1</SP> of a dummy printing hammer 715<SP>1</SP> and when this is released with the other hammers 715, its spring actuator 700<SP>1</SP> with its arm 109 lifts a detent 110 to render operative a one-cycle clutch 111, driving a shaft 51. A snail cam 112, Fig. 3, on the shaft 51 is then rotated and a follower roller 113 transmits motion to a linkage 114 which moves a bail 707 to restore the printing hammers 715. A stud 116 fixed to the snail 112 engages a projection 117 depressing a slide 118, Fig. 5, and bringing a pawl 119 down to disengage a known link 7 from the tabulation control bar 1. Upon release from the bar 1, link 7 is spring-urged to rock a lever 20 counter-clockwise, a stud 23 on this lever moving to the R.H. end of a slot 10 and rocking a bell-crank 120, Fig. 6, to allow an arm 123, Fig. 1, of a further bellcrank to be lowered, by spring means, thus bringing a lug 124 on its other arm into latching engagement with the hammer restoring bail 707. This prevents actuation of the printing hammers until the tabulating movement has been completed, when the lug 6, Fig. 5, engages the next slot 11 and the lever 20 is returned with a clockwise movement. The counterclockwise movement of the lever 20 during movement of the carriage, brings a cut-away portion of the link 7 below the pawl 119, thus providing for immediate re-engagement of the lug 6 with the tabulating bar 1 irrespective of the position of the link 118. When the repeated printings actuated from the auxiliary clutch 111 and controlled by the tabulating bar 1 have been completed a cam 194 on the carriage engages and rocks an arm 192, Fig. 7, fixed to a square shaft 199 carrying an arm 218, Fig. 1, with a pawl 122 a lug on which is thus brought under the slide 118. When the slide is depressed, the pawl 122 is rocked and en-. gages the bell-crank 103, thereby freeing the clutch pawl 153 and allowing completion of the main cycle. The arm 218 also operates through a link 220, Fig. 7, to lift a latch 222 into the path of a pin 165 on an arm 163 during the return movement of the latter. This causes a plate 223 to be rocked and, through a yieldable connection 226, to operate a friction clutch to cause carriage return. When the carriage reaches its initial position, a cam 196, acting on an arm 198, restores the square shaft 199 &c., to original positions and releases the carriage return clutch. Line-spacing mechanism includes linkage controlled from the cam 316, Fig. 7, operable to lower an arm 179, Fig. 3, which allows a bar 216 on the carriage to be lowered and a pawl 814 to engage the platen ratchet 820. Selection of totalizers is controlled by a tube 82, Fig. 5, mounted on the platen carriage and provided with four rows of graded perforations adapted to be sensed by feelers 83, Fig. 6, related to the respective totalizers as described in Specification 406,152. To prevent a change of control during tabulation the pin 23 operates a latch 27 when the carriage is returned, the latch releasing a spring-urged plate 33 for clockwise movement about a point 34. An extension 36 engages a pin 37 to operate a one-cycle setting clutch 24 while a projection 59 operates to close the motor circuit. Towards the end of the totalizer setting cycle which is as described in Specification 406,152, a cam 55 fast to the driven member of the clutch operates through a linkage 202, 203, 204 to restore the plate 33. The above operation is prevented at other times by a projection 267, Fig. 1, on the main clutch operating lever 150 which, while in operative position, prevents movement of the plate 33. Total printing. A total is taken by releasing the differential actuators 610, Fig. 2, and allowing them to rotate the totalizers subtractively until projections 457 engage zero stops on a member 613, the machine being set for subtractive operation by contact of the total key 278, Fig. 1, with a pin 352 of the rocker control plate 326. Thus the total is set up in the type bars 611 and is printed when the machine cycle is automatically started after the zeroizing operation has been completed. If the lever 101 is in operative position the cycle will be interrupted for repeat printing as described above. Upon completion of the main cycle, the record sheet is ejected automatically by known mechanism. For printing negative totals three machine cycles are required as described in Specification 389,630. Means are therefore provided to prevent interruption of the machine operation during the first two cycles. Movement of a sector 140, Fig. 3, to read off a " nine " in the highest denomination of the totalizer (indicating a negative total) trips a latch 144 which allows clockwise movement of a spring-urged arm 145 controlling the negative total mechanism in known manner. A second spring-urged lever 159 is allowed to move counter-clockwise and latches a member 149 to prevent movement of the printing hammers 715 during two machine cycles until the restoration of the arm 145 towards the end of the second cycle.