Typewriting machines – Means auxiliary to typewriting function – Indicator means
Patent
1996-09-12
2000-06-27
Hilten, John
Typewriting machines
Means auxiliary to typewriting function
Indicator means
400709, 400711, B41J 2942
Patent
active
060798920
ABSTRACT:
A sheet end detector comprising a light-emitting element and a light-receiving element for detecting changes in the amount of light associated with movement of a piece of a recording medium is provided. A standard value calculator detects the difference between the sheet end detector platen voltage Vp corresponding to light reflected only from said platen and said sheet end detector paper saturation voltage Vm corresponding to light reflected only from the recording medium. The amount necessary to feed the paper for platen voltage Vp to reach paper saturation voltage Vm is a constant value, irrespective of recording medium characteristics, which is when all of the light is reflected by the recording medium and the entire end portion of a piece of a recording medium has reached a predetermined position relative to the position of the sheet end detector. A standard value is calculated by multiplying this difference by a constant coefficient C and then adding back the lesser of Vp or Vm, C being a numerical value greater than 0 and less than 1 and being an indication of the desired position of the leading edge of the recording medium. A comparator compares the standard value and a signal from the sheet end detector and determines when the signal corresponds to the standard value, which is indicative that the presence of a leading edge or trailing edge of the recording medium has reached a predetermined position.
REFERENCES:
patent: 4540299 (1985-09-01), Yamada
patent: 4614950 (1986-09-01), Ito
patent: 5150977 (1992-09-01), Yoshikawa
700 IBM Technical Disclosure Bulletin 30 (1987) Sep., No. 4, Armonk, NY, USArr.
Ishida Hiroshi
Kumazaki Masayuki
Uchiyama Yukihiro
Yamaguchi Kazuhiko
Yamaguchi Naoto
Hilten John
Seiko Epson Corporation
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