Patent GB-813322-A (GB)
Title: Data printing or indicating apparatus
IPC: B41J3/44
Filed: 1956-03-02
Abstract: 813,322. Calculating-apparatus. BURROUGHS CORPORATION. March 2, 1956 [March 4, 1955], No. 6691/56. Class 106 (1). [Also in Groups XVI and XXXVII] The differential actuators of a cyclicallyoperating data-printing or indicating machine are arrested under the control of electrical selecting means and a pulse-generator operating synchronously with the machine. The invention is applied to the control of the type-bars 562 of the machine described in Specification 709,181. The twelve type-bars are respectively geared to plates 523 movable in known manner under the control of differential actuators 511. In the present arrangement, the latter are arrested by the differentially timed releases of tongues 46, Fig. 6, by electromagnets 41 arranged in a frame 36, 37. Each of the electromagnets I-XII, Fig. 2, is connected to a row of nine switches, one of which is closed, to cause a corresponding decimal digit to be printed, under the control of a separate calculating machine or of an electronic computer. All of the switches of a given digital value are connected to a corresponding one of nine switches which form a pulse generator 34 (see Group XXXVII), and are actuated in sequence as the actuators 511 are moved forwardly in a machine cycle. These switches 77, 89, Figs. 5 and 9, are normally closed but tappets 92 controlling them are released in turn, to allow the switches to open, by a shoe 157 movable with the bail rod 531 which controls the differential actuators 511. The circuit is energized early in each machine cycle so that all the electromagnets for which switches have been closed are energized and hold their tongues 46 away from the teeth 171. In denominations in which zeros are to be printed, no switches are closed and consequently, the electromagnets remain de-energized and their tongues 46 remain in the path of the first teeth 171 so as to arrest the corresponding actuators 511 in zero positions. The other electromagnets are de-energized as the switches of the signal generator corresponding to the closed digit switches are opened so as to arrest the associated actuators in corresponding positions. The tongues 46 have low retentivity inserts to prevent sticking. At the end of the forward movement of the actuators, the circuit is deenergized and a cam-shaped shaft 126, Fig. 6, is rocked clockwise to cause arms 55 to lower the tongues 46 through springs 68. The shaft 126 remains in this position until after the energization of the circuit early in the next cycle when it is returned to the position shown to enable the tongues 46 to become effective. Prior to the return movement of the actuators, a cam (not shown) co-operates with a stud 116, Fig. 5, in a frame 96 to lower the latter and with it the tappets 92. The frame is restored early in the next cycle to allow the tappets to reengage the shoe 157. The cams referred to above for controlling the tongues of the electromagnets and the signal generator are mounted on a shaft 800<SP>11</SP>, Fig. 8, together with a lever 144 carrying a latch 913<SP>11</SP>, which must be depressed, to engage a stud 923<SP>11</SP> in an operating slide 924, in order to render the mechanism effective. The latch 913<SP>11</SP> is depressible by a finger 921<SP>11</SP> which may be controlled remotely as described in Specification 782,253 or manually.