Patent GB-622088-A (GB)
Title: Improvements relating to means for inking ribbons
IPC: B41J31/16
Filed: 1947-03-12
Abstract: 622,088. Typewriters &c. NATIONAL CASH REGISTER CO. March 12, 1947, No. 6906. Convention date, July 10, 1946. [Class 100 (iv)] Ink-ribbon mechanism.-A ribbon inking device particularly for cash registers, accounting machines, &c., comprises an independent removable ink reservoir mounted below a freelymounted non-absorbing ink transfer roller rotated by the ribbon, a capillary device to supply ink from the reservoir to the roller and a resiliently-mounted compression roller adapted to press the ribbon against the transfer roller. The ribbon 50 travels in either direction between spools 30, 31 over guiding rollers 51, 52, 56, 58 and is guided across the machine below the type-wheels 76 by a ribbon guide 54 attached to frames 39, 40. The frames 39, 40 are slotted at 44 to engage spindles 41, 42 and can be pivoted about the spindles to align red or black strips of the ribbon with the type-wheels, and raised to bring the ribbon adjacent to the type-wheels for the impression. The frames are raised by the rotation of cams 43, 44, which engage rollers and pins 47, 48. The swinging movement is derived from a link 75 which when depressed actuates a lever 71 having a pin-andslot connection 72 with an arm 67 connected by levers 68 to latches 61, 62 imparting the oscillatory movement to the frames 39, 40. The connection between the arms is adjustable and comprises eccentric rollers 63, 64, carried on the frames 39, 40 co-acting with a pin 65, the levers 61, 62 being held in slotted engagement with the collars by a spring 70. The ink reservoirs 124, 125 are removably mounted on supports 121 and secured by a latch 123, and the wick 126 is upwardly pressed to the roller 130 by a spring 127. In an alternative form, the two reservoirs are constituted as a single divisional unit which has a coverable top opening for filling purposes. The ribbon feed mechanism is operated from a cam on a main shaft of the machine through a pair of segmental levers oscillating an arm 88 freely pivoted about a shaft 32 carrying the spools 30, 31. Detachably secured to the spool 31 is a ratchet disc 81 operated by a tooth of a three-toothed pawl 84 carried by arms 85, 86 pivoted at 87 to the arm 88. A spring-pressed arm 95, also pivoted at 87, normally holds the member 84 with one tooth thereof in operative position. The arm 85 has a pawl 91 engaging a wide-toothed member 92 on the shaft 32 and is arranged so as normally to hold the tooth 84 away from the disc 81. When the member 88 is oscillated, the pawl 91 first rides down into a space between two teeth on the member 92 and allows the members 81, 84 to engage and rotate the spool 31. On the reverse movement, the tooth 91 rides upwardly and frees the tooth 84 so that clicking is prevented. Operation of the ribbon reversing mechanism causes a pawl 111 to engage the disc 81 and prevent its rotation, so that on operation of the member 88, the member 84 is rotated, forcing the pawl 93 outwardly. Fixed to the member 84 is another three-toothed member 93 with its teeth intermediate of those of member 84. The rotation of the latter causes its teeth to move out of engagement with the disc 81 and one of the teeth of member 93 to engage a ratchet disc 94 fixed to the spindle 32 to which the spool 30 is detachably secured. The tooth 95 holds the members 84, 93 in the new position and operation of the member 88 now causes the spool 30 to be rotated to wind up the ribbon through the ratchet feed 93, 94. Specification 447,481 is referred to.