Copying apparatus with image smear control

Details Copying apparatus with image smear control Copying apparatus with image smear control

1989-01-13

1990-08-21

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355309, G03G 1516

Patent

active

049510959

ABSTRACT:
A xerographic copying machine has a circulating endless belt photoreceptor. A toner image is transferred from the photoreceptor to a copy sheet at the transfer region. The sheet is fed to the transfer region by a pair of coating rolls driven by a variable speed stepper motor. The rolls feed the leading portion of the copy sheet at approximately the same speed as the photoreceptor. When the copy sheet contacts the photoreceptor the feed rolls are driven at a faster speed for a short interval to generate a buckle in the copy sheet just before the transfer region. The speed of the feed rolls is then returned to its initial value so that the buckle size remains constant while the remainder of the sheet is fed. The buckle provides sufficient surplus in the copy sheet to prevent it being pulled taut in the transfer region. This prevents smearing the unfused toner image. Also, the buckle bears against the concave guide surface of guide member which acts to stiffen the copy sheet in the process direction at the transfer station. This helps to reduce the tendency for any post-transfer lead-edge "socks" from propagating back to the transfer station which can also cause image smear.

REFERENCES:
patent: 4017067 (1977-04-01), Soures et al.
patent: 4025187 (1977-05-01), Taylor et al.
patent: 4092021 (1978-05-01), Fletcher
patent: 4355881 (1982-10-01), Tarumi et al.
patent: 4372669 (1983-02-01), Fantuzzo et al.
patent: 4519700 (1985-05-01), Barker et al.
patent: 4541711 (1985-09-01), Takahashi
patent: 4561756 (1985-12-01), Lang
Xerox Disclosure Journal, vol. 1, No. 5, May 1976, "Copy Sheet Registration System", Looney, J., pp. 85-86.

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