Patent GB-190815441-A (GB)
Title: Improvements in Typewriting Machines.
Filed: 1908-07-21
Granted: 1909-09-21
Abstract: 15,441. Underwood Typewriter Co., and Cooper, J. J. July 21. Typewriters. -In condensed-billing devices of the kind in which the platen is rotated backwards and forwards by means rotatable about the platen axle, means is provided whereby the rotation of the platen may extend through several revolutions, so that large bill-heads may be dealt with. One form of the device is shown in Figs. 2, 4, and 5, which are respectively a plan, a section on the line 4-4, and an end elevation. An arm 18 loose on the platen shaft 15 is provided with a stud 20 whereon is pivoted-a link 19 carrying a block 16, which is adapted, when the arm 18 is swung, to traverse a spiral groove 12 in a disk 13 secured to the carriage 14 by a link 46. An arm 30, provided on opposite sides with a pin 31 and a finger 32, may slide on the arm 18 and be tensioned upwards by a spring 33. When the arm is at the zero position, the pin 31 is seated in a notch 34 formed in a flange 35 on the disk 13. By pressing in a handle 17 on the arm 30, the pin 31 is freed from the notch 34 and the finger 32 is engaged with a toothed wheel 36 secured on the platen shaft, so that rotation of the arms 18, 30 by the handle 17 is transmitted to the.platen, engagement of the finger 32 and the wheel 36 being maintained by the pin 31 which engages the flange 35. The spiral 12 is formed with as many convolutions as the maximum number of times it is required to rotate the platen, and to prevent the pin 31 from dropping into the.notch 34 at the end of each revolution and thereby releasing the finger 32, there is provided on the link 19 a projection 37, which is caused by the tilting of the link to engage with a lug 38 on the arm 30 and thereby hold it depressed. The motion of the block 16 towards the centre of the spiral is limited by an adjustable stop 21 which may be seated in any of a series of holes 22 in the disk 13, there being as many holes as there are teeth on the wheel 36. The stop 21 is mounted in a box 24 on a link 25, which is pivoted at 26 to a sleeve 27 loose on the hub of the disk 13. The stop is pressed inwards by a spring, and may be released and seated in another hole by pulling a knob 29 and rotating the sleeve 27 and the link 25. In the device shown in horizontal and vertical section in Figs. 9 and 11, the crank 18 is loose on the spindle 15 and works between the convolutions of a helix 40 secured to the carriage 14 by a link 46. The spindle 15 may slide inside the platen-shaft, and has a driving connexion therewith consisting of a disk provided with pins which may slide in holes in a disk on the platen shaft. The crank 18 carries a pivoted spring pawl 32 having a pin 31, which may engage the inside of the helix and hold the pawl in engagement with a toothed wheel 36 fast on the spindle 15. When the crank is at the zero position, the pin 31 enters a notch 34 in the helix and the pawl is released. The notch 34 is provided with a spring-gate 33. The stop for arresting the crank consists of a block 45 fitting between the convolutions and secured by a spring-pressed pin 21, which is mounted in a box 24 and may be seated in any of a series of holes 22 in the periphery of the helix.