Abstract: Provided is a transport device including a first transport member that transports a sheet-shaped medium in a transport direction, a transport path that is formed by a first guiding member which guides the medium in the transport direction and a second guiding member which guides the medium in the transport direction, at least one of the first guiding member and the second guiding member including a widened part on a downstream side of a processing position and on an upstream side of a second transport member, a pressing member that presses the medium to the first guiding member, a processing unit that performs a processing on the medium which is transported in the transport path, and a second transport member that transports the medium, which is guided by the first guiding member and the second guiding member, in the transport direction.

Abstract: A conveyance apparatus includes: a first conveying unit that includes a first conveyance passage along a first direction forming an angle with respect to a horizontal direction, and conveys a medium in the first direction; a returning conveyance unit that conveys the medium towards a second direction having a component of an opposite direction to the first direction; a second conveying unit that includes a second conveyance passage along the second direction, and conveys the medium in the second direction; a first processing unit that is disposed on the first conveyance path, and performs processing on a first surface of the conveying medium; and a second processing unit that is disposed at a position closer to the returning conveyance unit than the first processing unit, and performs processing on a second surface of the conveying medium.

Abstract: Provided is a transport device including a first transport member that transports a sheet-shaped medium in a transport direction, a transport path that is formed by a first guiding member which guides the medium in the transport direction and a second guiding member which guides the medium in the transport direction, at least one of the first guiding member and the second guiding member including a widened part on a downstream side of a processing position and on an upstream side of a second transport member, a pressing member that presses the medium to the first guiding member, a processing unit that performs a processing on the medium which is transported in the transport path, and a second transport member that transports the medium, which is guided by the first guiding member and the second guiding member, in the transport direction.

Abstract: A conveyance apparatus includes: a first conveying unit that includes a first conveyance passage along a first direction forming an angle with respect to a horizontal direction, and conveys a medium in the first direction; a returning conveyance unit that conveys the medium towards a second direction having a component of an opposite direction to the first direction; a second conveying unit that includes a second conveyance passage along the second direction, and conveys the medium in the second direction; a first processing unit that is disposed on the first conveyance path, and performs processing on a first surface of the conveying medium; and a second processing unit that is disposed at a position closer to the returning conveyance unit than the first processing unit, and performs processing on a second surface of the conveying medium.

Abstract: An image forming apparatus includes an image forming unit forming an image on a recording sheet; a transport unit transporting the recording sheet; a support surface supporting the recording sheet; a rotating member having an outer peripheral surface pressed against the support surface and rotationally following the recording sheet when the recording sheet passes through between the support surface and the outer peripheral surface; an ascertaining unit ascertaining a length of the recording sheet on the basis of an amount of rotation of the rotating member; and a restricting unit restricting a movement of the rotating member that moves toward the support surface after the recording sheet passes through between the support surface and the outer peripheral surface, the restricting unit preventing the outer peripheral surface, which comes into contact with the recording sheet, and the support surface from coming into contact with each other.

Abstract: A controller includes a pattern forming unit that forms patterns multiple times on a first image holding member which is driven such that a surface thereof is circulated, a first detection unit that optically detects the patterns formed on the first image holding member by the pattern forming unit, a second detection unit that optically detects the patterns transferred from the first image holding member to a recording medium which is transported in a set transport direction, and an adjustment unit that adjusts a length in the transport direction of an image transferred to the recording medium on the basis of a time interval when the patterns are detected by the first detection unit and a time interval when the patterns are detected by the second detection unit.

Abstract: A position detection apparatus includes: a moving member in contact with a detection object that moves following movement of the detection object; and a support member that rotatably supports the moving member; a detection unit that detects a positional change of the moving member, the moving member being acted on by a first force as a force to press the moving member against the detection object, a second force as a force to press the moving member substantially in a direction of a rotation shaft of the moving member, and a third force as a force to press the moving member in a direction substantially orthogonal to the direction of the rotation shaft of the moving member.

Abstract: A rotation amount detecting device for a rotation body includes: a first rotation body having a first surface; a second rotation body having a second surface formed of a material different from that of the first surface and contacting the first surface, and rotating with rotation of the first rotation body; a first support member rotatably supporting the first rotation body at a first position and supporting thereof to be swingable around a first axis at a position different from the first position; a second support member rotatably supporting the second rotation body at a second position and supporting thereof to be swingable around a second axis provided at a position different from the second position, the second axis being the first axis or an axis in the first support member other than the first axis; and a detector that detects a rotation amount of the second rotation body.

Abstract: An information processor includes a storage unit storing a first coefficient in correspondence with a characteristic of a sheet of paper, a first acquisition unit acquiring a first signal based on the water content of a first sheet of paper not having an image formed thereon, a second acquisition unit acquiring a second signal based on the water content of the first sheet of paper having an image formed thereon and being heated for fixing, a determination unit determining the characteristic of the first sheet of paper, a first calculation unit calculating a variation in water content of the first sheet of paper using the difference between the first signal and the second signal and the first coefficient stored in correspondence with the determined characteristic, and a second calculation unit calculating an expansion and contraction ratio of the first sheet of paper using the variation in water content.

Abstract: A controller includes a pattern forming unit that forms patterns multiple times on a first image holding member which is driven such that a surface thereof is circulated, a first detection unit that optically detects the patterns formed on the first image holding member by the pattern forming unit, a second detection unit that optically detects the patterns transferred from the first image holding member to a recording medium which is transported in a set transport direction, and an adjustment unit that adjusts a length in the transport direction of an image transferred to the recording medium on the basis of a time interval when the patterns are detected by the first detection unit and a time interval when the patterns are detected by the second detection unit.

Abstract: An image forming apparatus includes a forming section that forms an image on a side of paper; a fixing section that applies heat to fix the image onto the side of the paper; a paper reversing section that reverses a front and back of the paper having the image fixed onto a first side in the fixing section; a first measuring section that is provided between a registration roller and the forming section to measure a first moisture content of the paper before an image is formed on the first side, and a second moisture content of the paper before an image is formed on a second side, after the image is fixed on the first side; and a calculating section that calculates amount of change of the size of the paper on the basis of the difference between the first moisture content and the second moisture content.

Abstract: An abnormality detecting device for a rotation body includes: a rotation body rotating while coming in contact with a sheet transported at a predetermined speed; an output unit outputting pulses of a number in proportion to a rotation amount of the rotation body; an acquisition unit acquiring periodic information associating a position of the rotation body during a single rotation and a period of each of the pulses corresponding to the position with each other, the periodic information being acquired based on the plural pulses outputted from the output unit along with the rotation of the rotation body at the predetermined speed; a memory storing the periodic information as reference periodic information; and an abnormality detector detecting an abnormality occurred in at least one of the rotation body and the output unit based on the reference periodic information and new periodic information acquired after the reference periodic information is acquired.

Abstract: A length measurement apparatus including: a measurement portion that measures a sheet length based on a rotational amount of a length measurement roll for a first detection period in which first and third sensors detect the sheet, and a sheet length based on a rotational amount of the length measurement roll for a second detection period in which the second sensor and any one of the first and third sensors detect the sheet, the any one of the first and third sensors being disposed at a position opposite to the second sensor via the length measurement roll; and a whole length calculation portion that selects the sheet length nearer to integral multiples of the circumference length of the length measurement roll from the sheet lengths measured for the first and second detection periods, and calculates the whole length of the sheet by using the selected sheet length.

Abstract: An information processor includes a storage unit storing a first coefficient in correspondence with a characteristic of a sheet of paper, a first acquisition unit acquiring a first signal based on the water content of a first sheet of paper not having an image formed thereon, a second acquisition unit acquiring a second signal based on the water content of the first sheet of paper having an image formed thereon and being heated for fixing, a determination unit determining the characteristic of the first sheet of paper, a first calculation unit calculating a variation in water content of the first sheet of paper using the difference between the first signal and the second signal and the first coefficient stored in correspondence with the determined characteristic, and a second calculation unit calculating an expansion and contraction ratio of the first sheet of paper using the variation in water content.

Abstract: An image forming apparatus includes a forming section that forms an image on a side of paper; a fixing section that applies heat to fix the image onto the side of the paper; a paper reversing section that reverses a front and back of the paper having the image fixed onto a first side in the fixing section; a first measuring section that is provided between a registration roller and the forming section to measure a first moisture content of the paper before an image is formed on the first side, and a second moisture content of the paper before an image is formed on a second side, after the image is fixed on the first side; and a calculating section that calculates amount of change of the size of the paper on the basis of the difference between the first moisture content and the second moisture content.

Abstract: An image forming apparatus includes an image forming unit forming an image on a recording sheet; a transport unit transporting the recording sheet; a support surface supporting the recording sheet; a rotating member having an outer peripheral surface pressed against the support surface and rotationally following the recording sheet when the recording sheet passes through between the support surface and the outer peripheral surface; an ascertaining unit ascertaining a length of the recording sheet on the basis of an amount of rotation of the rotating member; and a restricting unit restricting a movement of the rotating member that moves toward the support surface after the recording sheet passes through between the support surface and the outer peripheral surface, the restricting unit preventing the outer peripheral surface, which comes into contact with the recording sheet, and the support surface from coming into contact with each other.

Abstract: A sheet length measurement apparatus including: a rotating member that comes in contact with a recording sheet conveyed on a conveying path, and rotates along with the conveyance of the recording sheet; a rotation amount detector that detects a rotational amount of the rotating member; a fixing support member that fixedly supports an rotating shaft of the rotating member at a fixed position; an opposed member that is disposed opposite to the rotating member so as to hold the recording sheet between the rotating member and the opposed member, the opposed member being disposed so that the rotating member rotates along with the conveyance of the recording sheet; and a support member that supports the opposed member in a movable state in a direction to separate from or come in contact with a surface of the recording sheet.

Abstract: A sheet feed device includes an air flow generating part that generates an air flow for floating a sheet; a feed member that feeds a sheet by rotating, while applying a load to the top one of sheets stacked; and a transport condition sensing unit that is positioned not to obstruct an air flow generated by the air flow generating part and senses a transport condition of a sheet fed by the feed member.

Abstract: A recording medium supply apparatus includes: a conveyance member that conveys a recording medium; a retard member, in contact with the conveyance member, that forms a contact portion between the conveyance member and the retard member and retards the recording medium by holding the recording medium in the contact portion; and a buckling prevention unit, configured to contact with the recording medium on the upstream side of the contact portion between the conveyance member and the retard member in a conveyance direction of the recording medium, that prevents buckling of the recording medium in the conveyance direction.

Abstract: An abnormality detecting device for a rotation body includes: a rotation body rotating while coming in contact with a sheet transported at a predetermined speed; an output unit outputting pulses of a number in proportion to a rotation amount of the rotation body; an acquisition unit acquiring periodic information associating a position of the rotation body during a single rotation and a period of each of the pulses corresponding to the position with each other, the periodic information being acquired based on the plural pulses outputted from the output unit along with the rotation of the rotation body at the predetermined speed; a memory storing the periodic information as reference periodic information; and an abnormality detector detecting an abnormality occurred in at least one of the rotation body and the output unit based on the reference periodic information and new periodic information acquired after the reference periodic information is acquired.