Title: Shifting arrangement for exact space positioning of a writing carriage in typewriters

Abstract: A shifting arrangement is provided for the exact space positioning of a writing carriage for office, teletype or data typewriters in which the writing carriage is moved step-by-step alongside of a record structure in accordance with a predetermined character positioning pattern. The writing carriage is driven by a stepping motor which has a rotary field. A specific number of angle positions of the stepping motor field serve as basic advance positions of the stepping motor in order to compensate for the load angle of the stepping motor during running of the writing carriage. Such basic advance positions are assigned to each character positioning point of the positioning pattern. An electronic device is provided for triggering the rotary field of the stepping motor and automatically adjusting this rotary field to the corresponding basic advance position during running and setting the field to a rest position during stopping of the stepping motor in order to correct for the stepping motor load angle.

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Inventors: Giebler, Fritz (Munich, DE, US)
Hotzel, Oskar (Neuried, DE, US)

Application Number: 769563
Filing Date: 1977-02-17
Publication_date: 1979-03-13
Assignee: Siemens Aktiengesellschaft (Berlin & Munich, DE)
Primary Class(es): 400/322 318/685, 318/696, 400/320, 400/903
Other Classes:
US Patent Ref:

3541418	Nov, 1970	Agin et al.	318/685.
3554347	Jan, 1971	Perkins	197/82.
3586953	Jun, 1971	Markkanen et al.	318/685.
3748566	Jul, 1973	Brembs	318/685.
3950685	Apr, 1976	Kramer	197/82.
3986094	Oct, 1976	Quioque et al.	318/696.
3991355	Nov, 1976	Reehil et al.	318/696.
4004672	Jan, 1977	Hirano et al.	197/82.

Other Refs:
Primary Examiner: Wright, Jr., Ernest T.
Assistant Examiner:
Attorney: Hill, Gross, Simpson, Van Santen, Steadman, Chiara & Simpson