Patent GB-868520-A (GB)
Abstract: 868,520. Accounting - machines. BURROUGHS CORPORATION. Aug. 29, 1967 [Sept. 11, 1956], No. 27276/57. Class 106 (1). [Also in Group XVI] An accounting machine comprises cyclicallyoperable multi-order differential, calculating and printing mechanisms and a typewriting mechanism, and has a paper carriage normally retained against lateral movement by a mechanism actuated to release the carriage (a) by the main operating mechanism in calculating operations for movement to another columnar position, and (b) by the typewriting mechanism for letter-spacing movement. The invention is applied to the machine described in Specification 709,181 which is modified by the addition of typewriting mechanism. Type selection.-On depression of a typewriter key, e.g. 4543, Fig. 4, a corresponding lever, e.g. 4555, is rocked so as to depress a bail 4570 secured to a shaft 4572 also carrying an arm 4574, Fig. 8. A pawl 4576 on this arm is normally positioned over an arm 4579 which blocks movement of an ear of an arm 4585 on a release shaft 4586. On depression of a key, the pawl 4576 depresses the arm 4579 and so frees the arm 4585 for counter-clockwise movement to the position shown. The shaft 4586 is coupled to cause the engagement of a one-revolution clutch, Fig. 17 (not shown), which rotates a set of cams, one of which rocks a driving shaft for the typewriter mechanism. The coupling between the cam and the driving shaft is broken if the carriage is so far to the right that it is beyond the typing position, and also under the control of one of the coding slides described below which is freed for movement only when the space bar is depressed. The shaft 4586 is restored during the cycle and the arm 4579 moves up to block it again even if the key is held depressed since the pawl 4576 was moved from over the arm 4579 by the release of the arm 4585. A Repeat key holds the arm 4579 depressed to cause repeated cycles if desired. A bail 4595 on the shaft 4586 holds a depressed key in operated position during the cycle, and prevents depression of another key. The levers associated with the keys co-operate with crowding lock rollers 4566, Fig. 6, in a member 4650 and control the movement of toothed coding slides 4651-7. The latter in turn control the movement of a second set of seven slides which are released under cam control during the typewriter cycle. One of these is held against movement whenever a character key is depressed. The other six control links 4801-6, Fig. 16; arranged to couple slides 4821-6 for actuation by a blade 4832. Three of these 4821-3 have upward fingers with projections 4834 by which they rock levers 4841-3. Additional levers 4844 and 4845 with fingers 4850 are controlled by the levers 4841-3 and each of the levers 4841-6 is coupled to a slide 4871-5. The slides 4824-6 similarly control six slides 4881-6. The two sets of slides -4871-5 and 4881-6 together with a stop plate 4888 control two differential mechanisms for positioning a type box vertically to one of six positions and horizontally to one of seven positions respectively. The type box 5000, Fig. 22, slidably supports type bearing members in two rectangular groups, each having six rows of seven members each. It is removably secured in a support 5006 mounted for horizontal movement by rollers on a bar 5020 which is carried by vertically movable slides 5040. One of the latter carries a pawl 5050 coupled to a link 5051 which is urged upwardly by an arm on the typewriter driving shaft. The type box is thus raised until the pawl 5050 strikes the projected one of the stop slides 4871 &c. (or the stop plate 4888) when it is, rocked so as to break a toggle formed by itself with the link 5051. An arm 5065 is released to latch the slide 5040 by engaging the appropriate one of a series of steps at its base. The slides 4881 &c. similarly determine the position of a slide 5110 (see also Fig. 24), coupled to a lever 5108, 5104 which through links 5102 rocks levers 5101.so that their lower ends move outwardly. Normally, a rocker 5100 mounted on a pin passing through the type box support 5006 engages a pin in the lower end of the left lever 5101 so that the rocker and type box will be moved to the left, but an arm 5138, Fig. 25, may be rocked by a Shift key to rock the rocker so that it engages the other lever 5101 and moves the type box to the right instead. A toothed yoke 5150, Fig. 27, engages square pins 5038 at the end of the pin carrying the rocker 5100 to lock the type box in its selected horizontal position. Also, toothed members 5155 are thrust rearwardly to engage pins in the slides 5040 controlling the vertical movement of the type box. The yoke 5150 and the members 5155 are actuated by a shaft 5151 operated as described below. Hammer impression mechanism.-The selected type is struck by a plug 5216, Figs. 22 and 30, at the end of a tube 5211 sliding in bearings 5212. A spring 5215 passes through the tube and is anchored to the plug 5216 which can rock to prevent damage to the type. The tube has a flange 5210 which is struck by an arm 5200 to drive the plug against the type. The arm 5200 is released to the action of a spring by the rocking of a latch 5202 due to rocking of the shaft 5151 which occurs when an ear 5185 of an arm 5170 thereon is freed by a latch 5186, in turn actuated from the typewriter driving shaft. The arm 5170 is urged downwardly by a spring 5183 connecting it to a lever 5172 and when the arm 5200 is released, it trips a latch 5174 for the lever 5172 which then allows and assists in the return movement of the shaft 5151 and the locking devices operated thereby. During the last part of the typewriter cycle, the latch 5186 is able to re-engage the ear 5185 and an arm 5220 restores the lever 5172 and the arm 5200. Ink-ribbon mechanism.-The ribbon feed and lift mechanism described in Specification 709,181 is modified so as to be actuated during each cycle of the typewriter mechanism as well as in calculating cycles. Line-spacing.-The typewriter keyboard includes a Line-space key, depression of which causes actuation of the line-spacing mechanism described in Specification 709,181. This mechanism may also be actuated by slides, settable to effective position, on the tabulating keys 5471-5474 described below. Carriage drive.-As described in Specification 709,181, the carriage may be driven in either direction by the engagement of tabulating and return clutches under the control of tabulating and return shafts 1348, 1349, Figs. 37 and 40. In the present machine, a hysteresis clutch is introduced between the motor and the clutches. The hysteresis clutch is normally partly energized and the tabulating clutch is now normally engaged so that the carriage tends to move in the tabulating direction. The hysteresis clutch is fully energized by the means described below and also by a switch closed by the ribbon lift lever. The carriage is now arrested and located after both tabulating and letter-spacing movements by pawls 5341, 5340, Fig. 37, co-operating with reversely arranged ratchet wheels 5331, 5330 to arrest movement in the tabulating and return direction respectively. The wheels 5330, 5331 are connected to a pinion engaging the carriage rack through a resilient disc which absorbs shock. Letter-spacing.-At the start of a typewriter cycle, a switch 5344, Fig. 37, is closed so as to energize the hysteresis clutch fully and near the end of the cycle, a lever 5350 is momentarily rocked to rock the pawl 5341 to enable the ratchet wheel 5331 to escape one tooth for a letter-spacing movement in the tabulating direction. Back spacing.-The Back Space key actuates the spacing mechanism but also actuates a switch 5383, Fig. 37, to energize a solenoid Fig. 19 (not shown), which couples a link 5388 for cam operation. An arm 5397 (see also Fig. 40), is thus rocked to shift a link 5401 which it normally engages so as to rock the return control shaft 1349. An arm 5404 on this shaft rocks a lever 5406 which by means of a link 5409 withdraws the pawl 5340 to permit return movement. The shaft 1349 is retained in operative position by a latch 5420. An arm 5380 operated directly by the Back space key shifts a pawl 5416 into engagement with the tabulating ratchet wheel 5331 and when the ratchet wheels rotate, the pawl 5416 is cammed outwardly and its other end cams the latch 5420 so as to release the return shaft after one letter-space movement. Column spacing.-The tabulating and return control shafts 1348, 1349, Fig. 42, are latched when actuated by a latch 5430 and the latch 5420 respectively. An arm 5434, Fig. 37, and the arm 5404 on these shafts both co-operate with the lever 5406 to withdraw the pawl 5340 and, through a link 5436, the pawl 5341 so as to free the carriage. Moreover, actuation of either of the control shafts 1348, 1349 is arranged to close the switch 5344 to cause the hysteresis clutch to be fully energized. An active latch 5420 or 5430 is tripped to release its control shaft and hence the pawls 5340, 5341, by a column control projection 5425, Fig. 43, on the carriage programme unit shaft 1740. When the return control shaft 1349 is rocked, an arm 5452 rocks a lever 5443, Fig. 48, which releases a lever 5445 carrying a stud, the downward movement of which engages the return clutch. The lever 5443 is coupled to a lever 5450 which rocks a lever 5440 carrying a stud which disengages the tabulating clutch. When the control shaft 1349 is restored, a link 5454 restores the lever 5445 to disengage the return clutch and re-engage the tabulating clutch through the levers 5443 and 5450. When the tabulating control shaft 1348 is actuated, an arm 5456 rocks a lever 5457 which rocks the lever 5445 to ensure the disengagement of the return clutch. Both control shafts may be rocked at the same time to disengage both clutches to permit manual movement of the carriage. Typewriter skip tabulation and return.-The tabulating and return control