Abstract:
An image reading device includes a reading unit provided with an image sensor and configured to read a manuscript placed on a contact glass, a manuscript sensor whose output level varies depending on whether the manuscript is detected, and a moving mechanism configured to move the manuscript sensor from a predetermined reference position in an oblique direction with respect to a main scanning direction and a sub scanning direction such that a detection zone of the manuscript sensor passes through a side of the manuscript parallel to the sub scanning direction and a side of the manuscript parallel to the main scanning direction. A recognizing unit is also included that is configured to recognize lengths in the main scanning direction and the sub scanning direction of the manuscript, based on a displacement of the manuscript sensor from the reference position.
Abstract:
A sheet conveying device includes a sensor, a movement control portion, a detection processing portion, and a switching processing portion. The sensor detects a position in a width direction of a sheet conveyed by a pair of conveying members. The movement control portion controls the movement along the width direction of the pair of conveying members which is nipping the sheet, based on an amount of shift between the position detected by the sensor and a reference position. The detection processing portion detects a sheet size of the sheet. The switching processing portion switches between permitting and not permitting the movement of the pair of conveying members based on a sheet size associated with a sheet feed source and the sheet size detected by the detection processing portion.
Abstract:
An image forming device includes an image forming unit, a reading unit, a registration-less unit, and an engine control unit. The reading unit reads a sheet to be conveyed. The engine control unit moves the other end side of the registration-less unit to correct skew. The engine control unit obtains a deviation amount (first deviation amount) of the position of the sheet based on the correction, and changes a sheet conveyance speed from a first speed to a second speed when the sheet enters the registration-less unit. The engine control unit adjusts the timing to change from the first speed to the second speed based on the first deviation amount.
Abstract:
An image forming device includes a first control circuit, a second control circuit, a high-voltage substrate, and a polygon motor. The high-voltage substrate applies a voltage with a frequency of an application signal to a toner image forming member. The first control circuit generates a first clock signal, counts the number of the first clock signal, and generates a motor drive signal. The first control circuit counts the first clock signal and generates an adjustment signal. The second control circuit counts the number of actual measurements which is a count value of the second clock signal during one cycle of the adjustment signal. The second control circuit counts the second clock signal by a set value. A setting circuit in the second control circuit sets the set value in accordance with the difference between the number of actual measurements and a theoretical number of times.
Abstract:
An image forming apparatus includes a paper transport unit, an image forming unit, a reading unit, a foreign matter detection signal generation circuit, and a foreign matter detection control circuit. The foreign matter detection signal generation circuit generates a first foreign matter detection signal, based on an analog image signal to be output from a line sensor. In foreign matter detection processing, when a pixel that reads foreign matter continues by a specific first consecutive number or more in a signal based on the analog image signal of each pixel to be output from the line sensor, the foreign matter detection signal generation circuit sets a level of the first foreign matter detection signal to a level indicating the presence of foreign matter.
Abstract:
A maintenance system includes an image forming apparatus that performs image formation by a setting depending on the replacement part using a replaceably configured replacement part and a portable terminal that performs near field communication with the portable terminal. The portable terminal includes an image reading part that reads part information of the replacement part from a printed part affixed to the replacement part and a near filed communication part that transmits the part information read by the image reading part via the near filed communication. The image forming apparatus includes a non-contact IC tag in which the part information is written based on power generated from the near filed communication and an reflection processing part that reads the part information from the IC tag at the time of power on and reflects the part information in the setting.
Abstract:
A fixing device includes a heating rotating member, a pressing rotating member, a motor, a fixing pressure adjustment mechanism, a control section, a motor drive section, a detecting member, and a stop control circuit. The heating rotating member heats a paper sheet. The pressing rotating member is pressed to the heating rotating member. The motor can rotate in both forward and backward directions. The fixing pressure adjustment mechanism moves a rotating member to be moved between first and second positions. The control section includes a control device, issues an instruction of voltage to be applied to the motor. The motor drive section controls the voltage to be applied to the motor. The detecting member detects that the rotating member to be moved reaches the first position. The stop control circuit stops the motor without software control when the rotating member to be moved reaches the first position.