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 Sheet decurling apparatus

Details
Inventors: Ohmichi, Yoshiki;
Assignee: Minolta Co., Ltd. (Osaka, JP)
Primary Examiner: Chen; Sophia S.
Assistant Examiner:
Attorney, Agent or Firm: McDermott, Will & Emery

In an electrophotographic image forming apparatus, curling occurs in the sheet when it passes through the thermal fixing device. The invention equips the apparatus with a decurling path having a decurling mechanism and a path without any such mechanism, as well as an alternating claw that guides the sheet to either of the paths, such that the alternating claw 9 alternates between the paths based on the settings for each sheet supply unit that supplies the sheets. The sheets from a sheet supply unit that requires decurling are guided to the decurling path and decurling is performed. On the other hand, sheets from a manual paper tray in which special types of paper, such as transparencies, are often placed are guided to the path without any decurling mechanism and no decurling is performed. Consequently, a sheet decurling apparatus that appropriately decurls the curling of plain paper only and does not perform decurling on special types of paper, such as thick paper or transparencies, may be realized without an increase in cost.

DETAILED DESCRIPTION The object of the present invention is to resolve the problems identified above.
Another object of the present invention is to provide a sheet decurling apparatus that does not decurl special types of paper such as thick paper and transparencies, and that decurls plain paper only without any increase in cost.
Yet another object of the present invention is to provide a sheet decurling apparatus capable of performing appropriate decurl using a simple construction by detecting the properties or parameters of the sheet and performing control so that an amount of loop specified in advance may be obtained, or by selecting a conveyance path based on the detection results.
These and other objects may be attained by a sheet decurling apparatus, comprising: a plurality of sheet supply units; a first conveyance path that has a decurling device within its length and that conveys the sheets supplied from a sheet supply unit; a second conveyance path that does not have a decurling device within its length and that conveys the sheets supplied from a sheet supply unit; and selecting means for selecting either the first or second conveyance path depending on the sheet supply unit used.
In the construction described above, prescribed types of sheet are placed in the sheet supply units, and selecting means operates a conveyance path alternating means to alternate the conveyance paths based on the setting of each sheet supply unit.
Sheets supplied from a sheet supply unit that requires decurling are guided to the first conveyance path equipped with a decurling device, and sheets supplied from a sheet supply unit that does not require decurling are guided to the second conveyance path that is not equipped with a decurling device.
Each sheet supply unit comprises a sheet cassette or manual sheet tray.
A drive means such as a solenoid may be used for the conveyance alternating means.
It is preferred that the decurling device comprises means for warping the sheet in the direction opposite the direction of the curling caused through the thermal fixing process



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