Patent GB-819467-A (GB)
Title: Improvements in wire printers
IPC: F15B11/02
Filed: 1955-12-23
Abstract: 819,467. Selective printing. INTERNATIONAL BUSINESS MACHINES CORPORATION. Dec. 23, 1955 [Dec. 31, 1954], No. 36936/55. Class 100(4) In a wire printer, the print wires together with their selecting code rods are assembled on the same support plates 42 which may be readily assembled and removed from the printer. There is one support plate 42 for every two letter-spaces, the group of print wires 56 forming the type-elements for one character being mounted on one side of the support plate 42, and the wires for an adjacent character on the other side. The plates are mounted on cross-bars 12, 14, 16, 18 and spaced transversely across the printer by combs 52 so that the wires 56 from the printing heads 28 may be received in slots in a bar 58, Fig. 3. The wires extend from the bar 58 to accommodate inertia slugs 64 and project towards wire setting control rods 72, and which are movable in a housing 70 slidably supported on the removable plates 42. The control rods 72 are axially and rotatively shifted according to which wires are to be displaced by setup assemblies 24 suspended from a cam assembly 26 and detachably mounted on cross bars 18, 20. Axial movement of the code rods 72 is effected by an extension stem 98 engaged by a compound lever 104 operated by a wire 110 and lever 148, whose degree of movement is dependent upon the aggregate shift cause by three sliding wedges 155. The wedges 155 in the lowerright, Fig. 1b, are raised by rods 168 and levers 170 carrying pawls 178 which swing into the path of power-reciprocating cam slides 174, 176 when appropriate righthand electromagnets A-F are energized in accordance with an incoming code. Rotative shift of the control rods 72 is effected by a pinion 100 on the stem 98, and a pair of racks 116, 118, engaging either side of pinions 100, and which are coupled together by a lever 130; the rack 118 is detachably clipped to a wire 128 operated by the mechanism on Fig. 1b in a manner similar, to the wire 110. The print wires positioned en the other face of the plate 42, are operated by the lefthand assemblies of wedges 155. slides 174, 176, and left-hand electromagnets A-F. There are two slides 174, 176 associated with each printing head to enable a non- return-to-zero arrangement of the wedges 155, the slides being operated by cams 200 in the cam assembly 26. This assembly also includes a cam 208 that operates linkage 210, 216, 218, 220, and reset, wires 192 to. restore latch arms 183 associated with the electromagnets and the pawls 178 after operation. After the code rods 72 have been set they are moved to selectively displace the print wires by a cam 334, Fig. 1a, followers 336, 338, cranks 354, 356 and adjustably associated headed slide bars 364 which co-operate with lugs 366, Fig. 3, of the control rod housing 70. To effect impression the printing heads 28, with appropriate wires displaced, are moved by a red 382 from a crank 368 and powered cam 378. The print heads 28 are carried by a transverse frame 30 attached to end plates 386 slidably adjustable in openings in the printer framework 10. Vernier line-spacing adjustment is made by rotation of eccentrics 390, which through movement of blocks 388, .cause a vertical movement of plates 386. Specifications 662,160, 729,064, 763,407 and 785,661 are referred to.