Image forming apparatus
AssigneeCanon Kabushiiki Kaisha
InventorsTakashi Nakahara, Hitoshi Ueki, Tomoko Tanaka, Kohei Maeda, Atsushi Wada, Hiroshi Fuse
Life of this patent
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Abstract
A position detecting sensor for detecting that a sheet having come into an openable both-face conveying path for reversing the surfaces of the sheet having an image formed on one surface thereof and conveying the reversed sheet to an image forming portion has arrived at a predetermined re-feeding position, and the position detecting sensor is designed to be capable of detecting also the presence or absence of the occurrence of jam in the both-face conveying path, the mounting and dismounting of a both-face conveying portion and the opening and closing of the both-face conveying path.
Claims25
An image forming apparatus for reversing surfaces of a sheet having an image formed on one surface thereof by an image forming portion and re-conveying the reversed sheet to said image forming portion for image formation on a second surface of said sheet, said image forming apparatus comprising:
- a two-sided copy conveying portion having an openable and closable two-sided copy conveying path for conveying the reversed sheet to the image forming portion, said two-sided copy conveying portion detachably mounted to said image forming apparatus;
- and
- a position detecting sensor means for detecting a sheet in said two-sided copy conveying path at a predetermined position,
- said position detecting sensor means also for detecting a jam in said two-sided copy conveying path, a detachment of said two-sided copy conveying portion, and an opening and closing of said two-sided copy conveying path.
An image forming apparatus for reversing surfaces of a sheet having an image formed on one surface thereof by an image forming portion and re-conveying a reversed sheet to said image forming portion for image formation on a second surface of said sheet, said image forming apparatus comprising:
- a two-sided copy conveying portion having an openable and closable two-sided copy conveying path for conveying the reversed sheet to the image forming portion, said two-sided copy conveying portion detachably mounted to said image forming apparatus;
- a position detecting sensor for detecting a sheet in said two-sided copy conveying path at a predetermined position;
- and
- control means for controlling a stoppage and conveyance of said sheet based on a detection signal from said position detecting sensor
- based on a detecting an occurrence of a jam in said two-sided copy conveying path, a mounting and dismounting of said two-sided conveying portion and an opening and closing of said two-sided copy conveying path by use of said position detecting sensor.
An image forming apparatus for reversing surfaces of a sheet having an image formed on one surface thereof by an image forming portion and re-conveying the reversed sheet to said image forming portion for image formation on a second surface of said sheet, said image forming apparatus comprising:
- a two-sided copy conveying portion having an openable and closable two-sided copy conveying path for conveying the reversed sheet to the image forming portion, said two-sided copy conveying portion detachably mounted to said image forming apparatus;
- and
- a position detecting sensor comprised of a photo interrupter and a pivotally mounted flag member, wherein said flag member is pivotal among positions sensing an absence of a sheet in said two-sided copy conveying path, a presence of a sheet in said two-sided copy conveying path and an opened state of said two-sided copy conveying path.
Dependencies are inferred from the claim text.