When sheets having the same surface property and grammage are registered on a size basis, adjustment value registration operations need to be repeated for the respective sheets as many as these sizes. An image forming apparatus that includes a display unit and forms an image on a sheet sets a setting value of adjustment influenced by the characteristics of the image forming apparatus upon forming an image by using a sheet, and then displays a sheet list which displays a list of a plurality of types of sheets on a display unit and reflects the set setting value on at least one sheet selected from the sheet list.

An image forming apparatus includes an optical sensor configured to detect an image formed on an intermediate transfer belt. The optical sensor includes a first light emitting diode (LED), a second LED, a first photodiode (PD), and a second PD on a substrate. The first PD is arranged at a position at which specularly reflected light of light emitted from the first LED can be received, and scattered reflected light of light emitted from the second LED can be received. The second PD is arranged at a position at which scattered reflected light of light emitted from the second LED can be received. A light receiving surface of the first PD and a light receiving surface of the second PD are formed at different angles. The light receiving surface of the first PD has an area that is smaller than an area of the light receiving surface of the second PD.

A printer includes a first printing unit responsible for one of preceding printing and subsequent printing that are to be performed on one sheet in overprinting, an other of the preceding printing and the subsequent printing being performed by a second printing unit; and a base-printing controller that causes the first printing unit to print a base for printing by the second printing unit in an operation of forming a test pattern for registration between the preceding printing and the subsequent printing on the sheet.

An image forming apparatus includes an image forming unit that forms an image on a recording medium, a reversal transport unit that reverses front and back sides of the recording medium having an image formed by the image forming unit, and then transports the recording medium to the image forming unit, a detection unit disposed in a transport path of the reversal transport unit to detect the position of the recording medium in a transverse direction transverse to a transport direction, the transport direction being the direction of transport of the recording medium, and an adjustment unit that adjusts the position of an image in the image forming unit in accordance with the position of the recording medium detected by the detection unit.

An edge position detecting apparatus includes a light emitting device, a detecting device, and a calculating circuit. The light emitting device includes a plurality of light sources with different emission wavelengths. The light emitting device irradiates a conveyed object with linear light along a width direction of the conveyed object, the width direction being perpendicular to a conveying direction of the conveyed object. The detecting device detects, at a plurality of positions in the width direction of the conveyed object, intensity of reflected light of light emitted by the light emitting device. The calculating circuit calculates, based on a detection result of the detecting device, a position of an edge of the conveyed object in the width direction.

According to one embodiment, an image forming apparatus includes: a registration roller; a motor configured to drive the roller; and a controller configured to control the motor. The roller is disposed at a first position on a conveyance path of paper on which an image is to be formed, and sends out the paper toward a second position on the conveyance path. The second position is downstream from the first position on the conveyance path and is an image transfer position on the paper. The controller controls the motor by using both speed control and position control when the leading end of the paper is at a position from the first position to the second position, and controls the motor by using only the speed control when the leading end of the paper reaches the second position.

When sheets having the same surface property and grammage are registered on a size basis, adjustment value registration operations need to be repeated for the respective sheets as many as these sizes. An image forming apparatus that includes a display unit and forms an image on a sheet sets a setting value of adjustment influenced by the characteristics of the image forming apparatus upon forming an image by using a sheet, and then displays a sheet list which displays a list of a plurality of types of sheets on a display unit and reflects the set setting value on at least one sheet selected from the sheet list.

A registration system for a printing device and a method for controlling the same are disclosed. For example, the registration system includes a lead screw motor, a lead screw coupled to the lead screw motor, and a carriage coupled to the lead screw. The carriage includes two drive rollers, wherein each drive roller is coupled to a respective splined shaft coupled to a respective yoke, wherein the respective yoke is coupled to a drive pulley and a drive motor that is in a fixed position, wherein movement of the carriage causes the respective splined shaft of the two drive rollers to move guided by the respective yoke.

An image forming apparatus includes an image carrier, a transfer member, a registration roller pair, and a conveyance guide which includes a first conveyance guide and a second conveyance guide. The second conveyance guide has a main body portion and a shaft member. The shaft member is held by a shaft holding portion of the main body portion so as to be reciprocatable between a first position which is a most downstream-side position and a second position on an upstream side of the first position. When a first recording medium is conveyed, the shaft member is arranged at the first position such that a distance between the shaft member and the first conveyance guide is a predetermined distance. When a second recording medium is conveyed, the shaft member is arranged at the second position such that the distance between the shaft member and the first conveyance guide is increased.

An image forming apparatus includes a print engine, a sheet transportation unit, a line sensor, and a control unit. The print engine is configured to physically print an image to be printed on a print sheet. The sheet transportation unit is configured to transport the print sheet. The line sensor is arranged along a direction perpendicular to a transportation direction of the print sheet, and configured to detect positions of both end edges of the print sheet. The control unit is configured to (a) determine as a sheet center actual position a center position of the print sheet on the basis of the detected positions of both end edges of the print sheet, and (b) adjust a center position of the image to be printed so as to cause the center position of the image to be printed to agree with the sheet center actual position.