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A power module for typewriters employs a planetary gear arrangement to selectively divert power to either the indexing apparatus or the escapement apparatus.
English (United States)
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Typewriter Power Module For Indexing And Escapement
A power module for typewriters employs a planetary gear arrangement to
selectively divert power to either the indexing apparatus or the escapement
Referring to Fig. 1, a dual output power module for use in
indexing and escapement employs a stepper motor 1 as the prime mover.
An output shaft 1A of stepper motor 1 is coupled to an input shaft
11B for a planetary gear system 4. The input shaft 11B rotates with
a sun gear 4C (Fig. 2) of the gear system 4. A shaft 3, one
of the output shafts of the gear box 4, is part of the structure that
supports the planet gears 4D. Attached to shaft 3 is a gear 3A and a
disc 3B. The gear 3A drives an idler gear 10 which, in turn, drives
a platen gear 9A that is attached to platen shaft 9B of a platen 9.
(Platen gear 9A is shown as a single part; however, in the usual
typewriter or printer installation, a clutch device is interposed
between the platen gear 9A and the platen shaft 9B to permit the
platen to be rotated independently of the drive system.)
A second drive path for the planetary gear system 4 includes a ring gear 4E.
The ring gear 4E, an output pulley 4A and a brake disc 4B all move as one part.
Motion is transmitted from the pulley 4A to a leadscrew shaft 8 by a drive belt 7
which drives a pulley 8A. A disc 3B and an electromagnetic actuator 5 constitute
a brake and positive reference stop for output shaft 3. Similarly, disc 4B and
actuator 6 constitute a brake and a positive stop for output pulley 4B.
Alternatively, the brake stop could be located on idler shaft 10A or platen shaft
9B for the p...