JP2015114528A5 - - Google Patents

Claims (7)

An image recording means for recording an image on the recording sheet; a feeding means for feeding the recording sheet toward the image recording means; a feeding path for feeding the recording sheet toward the feeding means; A plurality of sheet supply means for supplying a recording sheet contained therein to the feeding path, and a light reflectivity for detecting the light reflectivity of the surface of the recording sheet supplied from the sheet supply means to the feeding path An image forming apparatus comprising: a detection unit; and a control unit that adjusts a predetermined control parameter based on a result of obtaining an output value from the light reflectivity detection unit when detecting the light reflectivity of the surface. In
The control means is configured to perform a process of determining a timing for acquiring the output value based on which of the plurality of sheet supply means supplies the recording sheet to the feeding path. An image forming apparatus. The image forming apparatus according to claim 1.
The time when the conveyance of the recording sheet is temporarily stopped in a state where the leading edge of the recording sheet in the feeding path is in contact with the feeding unit, and then the recording sheet is started to be fed into the image recording unit by the feeding unit. An image forming apparatus, wherein the control unit is configured to perform a process for estimating the timing with reference to a reference. The image forming apparatus according to claim 1 or 2,
As the feeding means, using a pair of feeding rollers that rotate while forming a nip in contact with each other and feed the recording sheet sandwiched in the nip toward the image recording means,
A conveying roller pair that rotates while forming a nip by contacting each other and conveys the recording sheet sandwiched between the nips toward the feeding roller pair is provided upstream of the feeding roller pair in the sheet conveying direction,
When the sheet supply means that has sent the recording sheet to the feeding path supplies the recording sheet to the vicinity of the entrance of the pair of conveying rollers in the feeding path, the recording sheet is the light reflectivity detecting means. As the timing to stabilize the posture at the opposite position of the sheet, the trailing edge release of the sheet is the timing before the trailing edge of the recording sheet sandwiched in the nip of the feeding roller pair exits the nip of the conveying roller pair. An image forming apparatus, characterized in that the control means is configured to perform a process for specifying a pre-timing. The image forming apparatus according to claim 3.
A length information acquisition means for acquiring length information in the recording sheet after being supplied to the feeding path or before being supplied;
The control unit is configured to perform a process of specifying a longer period as the timing before releasing the sheet trailing edge as the length acquired by the length information acquisition unit increases. Image forming apparatus. The image forming apparatus according to claim 3 or 4,
In the case where the sheet supply unit that has sent the recording sheet to the feeding path supplies the recording sheet to a position on the upstream side in the sheet conveyance direction from the vicinity of the entrance of the conveyance roller pair in the feeding path, The timing at which the posture of the recording sheet is stabilized at the facing position is the timing after the trailing end of the recording sheet having the leading end sandwiched in the nip of the feeding roller pair exits the nip of the conveying roller pair. An image forming apparatus, wherein the control unit is configured to perform a process of specifying a timing after a sheet trailing edge is released. The image forming apparatus according to claim 1,
For at least any one of the plurality of sheet supply means, a basis weight information acquisition means for acquiring basis weight information of a recording sheet accommodated therein is provided,
Among the plurality of sheet supply means, the sheet supply means capable of acquiring the information has different timings according to the basis weight as the timing even for the recording sheets supplied from the same sheet supply means. An image forming apparatus, characterized in that the control means is configured to perform a specified process. The image forming apparatus according to claim 1,
An environment detection means is provided to detect the environment.
Even if the recording sheets are supplied from the same sheet supply means in the plurality of sheet supply means, the control is performed so that the timing is determined as a timing depending on the detection result by the environment detection means. An image forming apparatus comprising means.