| US 7,568,691 B2 | ||
| Image forming apparatus | ||
| Yuzo Matsumoto, Abiko (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Apr. 20, 2007, as Appl. No. 11/737,967. | ||
| Claims priority of application No. 2006-135892 (JP), filed on May 15, 2006; and application No. 2007-097891 (JP), filed on Apr. 03, 2007. | ||
| Prior Publication US 2008/0036134 A1, Feb. 14, 2008 | ||
| Int. Cl. B65H 3/14 (2006.01); G05B 11/28 (2006.01) | ||
| U.S. Cl. 271—97 [271/98; 318/599] | 2 Claims |
| 2. An apparatus having a sheet feeding apparatus for blowing an air to sheets stacked on a tray, loosening the sheets, and
feeding the loosened sheet toward an image forming unit, comprising:
an air blowing mechanism which is constructed by combining a plurality of fans in order to blow the air to the sheets stacked
on the tray;
a control unit which controls the air blowing mechanism so as to form a set wind pressure by combining the plurality of fans,
the control unit controlling rotational speeds of at least two of the plurality of fans, individually, wherein the control
unit controls rotational speeds of at least two of the plurality of fans of the air blowing mechanism so as to be equal to
a target rotational speed set for each of the plurality of fans so that the set wind pressure can be obtained, wherein the
control device discriminates whether or not the rotational speeds of the plurality of fans are within target rotational speed
ranges which have been set for the plurality of fans, and wherein the rotational speeds of the plurality of fans are controlled
by PWM control and if it is determined by the control device that the rotational speeds of the plurality of fans are not within
the target rotational speed ranges, a PWM value of the fan whose rotational speed is not within the target rotational speed
range is adjusted; and
a memory which stores the PWM values of the every plurality of fans at the time when it is determined by the control device
that the rotational speeds of the plurality of fans are within the target rotational speed ranges,
wherein the PWM values of the every plurality of fans stored in the memory are corrected according to a type of sheet which
is fed and the fans are controlled based on the corrected PWM values.
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