Typewriter carriage escapement mechanism having two sets of teet

Details Typewriter carriage escapement mechanism having two sets of teet Typewriter carriage escapement mechanism having two sets of teet

1985-11-26

1987-12-15

Wright, Jr., Ernest T.

Typewriting machines

Carriage or carriage-moving or movement-regulating mechanism

Carriage-feed mechanism

4003307, 4003321, 4003323, 4003324, 4003326, 4003343, B41J 1948

Patent

active

047129344

ABSTRACT:
A typewriter carriage escapement mechanism comprises a rack (10) movable with the typewriter carriage (2) and having two sets of teeth (16 and 18) projecting in opposite directions. An escapement dog (30) has two separate teeth or sets of teeth (44 and 54) arranged to engage the two sets of rack teeth (16 and 18) alternately as the dog (30) moves at right angles to the rack (10), on operation of the keys (90) or space bar (92) of the typewriter. One of the sets of teeth (54) is mounted on a pawl (50) movable relative to the other tooth (44) or set of teeth, to enable both sets of teeth to be disengaged from the rack (10) to release the carriage (2). The pawl (50) is movable against a return spring (70) by means of an actuating rod (80) engaging a lug (62) on the pawl (50). The mechanism of the invention enables a single escapement member (30) to effect both the stepwise movement of the carriage (2) and also the carriage release. The elements of the mechanism need only to be reciprocated in a straight line, so simplifying the construction of the mechanism.

REFERENCES:
patent: 344933 (1986-07-01), Baldrige et al.
patent: 444873 (1891-01-01), Barron
patent: 456350 (1891-07-01), Yost
patent: 672523 (1901-04-01), Fox et al.
patent: 711358 (1902-10-01), Smith
patent: 712945 (1902-11-01), Lotterhand
patent: 727340 (1903-05-01), Fox et al.
patent: 827044 (1906-07-01), Smith
patent: 1041557 (1912-10-01), Alexander
patent: 1841113 (1932-01-01), Garbell

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