A cylinder member includes: a cylinder body having a cylindrical shape; a sheet member wound on the cylinder body; a first attachment portion provided at one end portion of the sheet member in a circumferential direction, the first attachment portion being detachably attached to the cylinder body; and a second attachment portion provided at the other end portion of the sheet member in the circumferential direction, the second attachment portion being detachably attached to the cylinder body.

An image forming apparatus includes a sheet storage, a sheet feed roller, an image forming device, a fixing device, a motor, a sensor, and a controller having a processor. The sheet storage is configured to store a sheet. The sheet feed roller is configured to feed the sheet stored in the sheet storage into the conveyance path. The image forming device is configured to form an image on the sheet. The fixing device includes a fixing belt and a pressure roller abutting on an outside of the fixing belt, and is configured to fix the image formed on the sheet. The motor is configured to drive and rotate the fixing belt by rotating the pressure roller. The sensor is configured to measure the drive current in the motor. The processor is configured to control a conveyance speed of the sheet based on the measured drive current.

A heating device includes a heating unit that heats in a non-contact manner an upper surface of a transport material that is transported; and a blowing unit that blows air against a lower surface of the transport material via multiple blowing holes that open with respect to the lower surface, the multiple blowing holes being disposed so that blowing holes that are closest and adjacent to each other in a transport direction of the transport material are shifted from each other in an intersection direction that intersects the transport direction.

An image forming apparatus includes an image forming portion configured to form a developer image on a recording material, a fixing portion configured to heat-fix the developer image to the recording material, a first motor configured to drive the image forming portion, a second motor configured to drive the fixing portion, and a control portion configured to control the first motor and the second motor. The second motor is a stepping motor. The control portion allows the second motor to start rotation at a speed in a self-start region, temporarily stops the second motor at a timing at which the first motor is activated, then allows the second motor to restart rotation at a speed in the self-start region, and changes the speed of the second motor to a speed outside the self-start region before the recording material arrives at the fixing portion.

Provided is an image forming apparatus including a secondary transfer portion which transfers a toner image onto a recording material; a fixing device which fixes the toner image onto the recording material, and a belt conveying portion which adsorbs the recording material between the secondary transfer portion and the fixing device, and conveys the recording material, in which the belt conveying portion includes a first velocity at the time of receiving a front end portion of the recording material in a traveling direction from the secondary transfer portion, and a second velocity before a rear end portion of the recording material in the traveling direction leaves the secondary transfer portion at the time of delivering the front end portion of the recording material in the traveling direction to the fixing device, and the second velocity is faster than the first velocity.

An image forming apparatus includes a first casing including a transfer unit, a second casing including a fixing unit, and a third casing provided between the first casing and the second casing and including an intermediary feeding member. The first casing includes a first discharging port discharging a recording material with a toner image. The second casing includes a first receiving port receiving the recording material with the toner image. A height from an installing surface of the image forming apparatus to the first receiving port in a vertical direction is different from a height from the installing surface to the first discharging port. The intermediary feeding member of the third casing is provided obliquely in the vertical direction from a second receiving port receiving the recording material from the first discharging port to a second discharging port delivering the recording material to the first receiving port.

An image forming apparatus includes: a rotatable transfer cylinder with a first groove formed in an outer portion thereof in a rotational radial direction that causes an image to be transferred to a recording medium when it passes along an outer surface of the transfer cylinder; a rotatable fixing cylinder that has a second groove formed in an outer portion thereof in a rotational radial direction, that causes the image transferred to the recording medium to be fixed thereto when the recording medium passes along an outer surface of the fixing cylinder; a loop-shaped circulating member that is wrapped at least around the transfer and fixing cylinders, that circulates in response to rotations of the transfer and fixing cylinders; a recording medium holding member supported by the circulating member, disposed in the first groove when the holding member passes along the transfer cylinder and disposed in the second groove when the holding member passes along the fixing cylinder; first and second driving units that rotate the transfer and fixing cylinders respectively; and that is configured such that a ratio of a moment of inertia of the fixing cylinder to an output torque of the second driving unit is set to be greater than a ratio of a moment of inertia of the transfer cylinder to an output torque of the first driving unit.

A transport device includes a rotating body including a recessed portion on an outer surface, a rotatable heat unit that is in contact with the outer surface of the rotating body and forms an interposition region in which a recording medium is interposed between the heat unit and the rotating body, a transport unit that: (i) includes a hold member capable of holding a portion of the recording medium near a leading edge, (ii) transports the recording medium by moving the hold member in a rotational direction of the rotating body with the hold member contained in the recessed portion, and (iii) causes the hold member to pass through the interposition region, and a controller that controls rotation of the rotating body such that the recessed portion stops at a position upstream or downstream of the interposition region in the rotational direction when an anomaly is detected.

An image forming apparatus includes a temperature sensor, a conveyance control portion, a driving control portion, an adjustment processing portion, and a stop processing portion. The temperature sensor is provided apart from a contact position between a fixing member and a transferred sheet to which a toner image has been transferred. The conveyance control portion continuously executes conveyance processes of conveying the transferred sheet. The driving control portion controls driving of a heater for heating the fixing member so that a temperature detected by the temperature sensor matches a predetermined temperature. The adjustment processing portion restricts the execution of the conveyance process until an adjustment process of adjusting a formation condition of the transferred sheet is completed. The stop processing portion stops the continuous execution of the conveyance processes when the restriction on the execution of the conveyance process continues beyond a predetermined timing.

A photoresponsive polymer includes a structural unit represented by the following general formula (1), the photoresponsive polymer being fluidized by light irradiation, and reversibly non-fluidized:

[Chemical formula 1]

R.sub.1—Z.sub.1═Z.sub.2—R.sub.2  General formula (1) in the formula, Z.sub.1 and Z.sub.2 each represent CH or N, and Z.sub.1≠Z.sub.2, R.sub.1 represents an aromatic hydrocarbon group having a substituent R.sub.a selected from the group consisting of an alkyl group, an alkoxy group, and a halogen atom at each of two ortho positions with respect to Z.sub.1, R.sub.2 represents an aromatic heterocyclic group with or without a substituent, and at least one of the R.sub.1 and the R.sub.2 is bonded to a group containing a structure derived from a polymerizable group.