Typewriter carriage escapement mechanism having two sets of teeth
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United States of America Patent
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-
Dec 15, 1987
Grant Date -
N/A
app pub date -
Nov 26, 1985
filing date -
Nov 28, 1984
priority date (Note) -
Expired
status (Latency Note)
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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.
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