Abstract: A pinch roller mechanism includes a rail, a slider, a roller bracket, a spring, and a pinch roller. The rail extends in a first direction crossing the conveyance direction of a medium while being apart from a medium driving roller configured to convey the medium. The slider is supported by the rail to be movable along the rail. The roller bracket is supported by the slider to be movable with respect to the medium driving roller. The spring is provided between the slider and the roller bracket and biases the roller bracket toward the medium driving roller. The pinch roller is rotatably supported by the roller bracket while setting the axial direction in the first direction.

Abstract: A pinch roller mechanism includes a rail, a slider, a roller bracket, a spring, and a pinch roller. The rail extends in a first direction crossing the conveyance direction of a medium while being apart from a medium driving roller configured to convey the medium. The slider is supported by the rail to be movable along the rail. The roller bracket is supported by the slider to be movable with respect to the medium driving roller. The spring is provided between the slider and the roller bracket and biases the roller bracket toward the medium driving roller. The pinch roller is rotatably supported by the roller bracket while setting the axial direction in the first direction.

Abstract: A printing device includes: a printing unit printing on a recording paper; a feeder unit that has a roller rotating in a first direction about a shaft and feeding the recording paper, and a motor rotating the shaft; a detection unit detecting a rotation of the shaft in the first direction and a rotation thereof in a second direction opposite to the first direction; and a control unit controlling the feeder unit, based on the rotation of the shaft detected by the detection unit. The control unit causes the motor of the feeder unit to rotate the shaft in the first direction and then stop the shaft, and subsequently causes the motor to rotate the shaft in the first direction before the printing unit prints, based on the rotation of the shaft in the second direction detected by the detection unit.

Abstract: A sheet discharge apparatus includes a discharge and sheet support unit, a detection unit, a rotation member having a first abutting portion positioned above the sheet support unit, and a pressing member provided rotatably independent of the rotation member. The discharge unit nips and discharges a sheet in a sheet discharge direction. The sheet support unit supports the discharged sheet. The rotation member rotates when the first abutting portion is pressed by the sheet. The detection unit detects a position of the rotation member. A second abutting portion of the pressing member abuts against the sheet at a position downstream from a position at which the discharge unit nips the sheet and upstream from the first abutting portion in the sheet discharge direction. The pressing member presses the sheet discharged from the discharge unit downward using the second abutting portion, regardless of a position of the rotation member.

Abstract: A liquid ejection device includes: a casing; a holder for rotatably supporting a sheet roll including a continuous sheet; a power transmission mechanism positioned beside the holder for transmitting rotational driving force thereto; a cartridge attachment portion positioned above the power transmission mechanism; a conveying mechanism for conveying the continuous sheet to a discharge opening of the casing; and a head for ejecting liquid to the continuous sheet. The holder supporting the sheet roll is rotatable about a rotation axis extending in a leftward/rightward direction. A cartridge is attachable to the cartridge attachment portion. An occupying range of the cartridge attachment portion is overlapped with an occupying range of the power transmission mechanism and outside of an occupying range of the sheet roll and the holder in the leftward/rightward direction. The holder and the cartridge are attachable to and detachable from the casing through an opening thereof.

Abstract: An image forming system, having a recording head, a sheet conveyer, an inverting mechanism, and a controller, is provided. The sheet conveyer conveys a sheet in a sheet-conveying direction. The sheet is nipped at nipping points located at positions upstream and downstream in the sheet-conveying direction with respect to a discharging position. The inverting mechanism inverts the sheet from a first side to the second side. The controller determines an initial arrangement of the sheet in the sheet conveyer where image-forming on the second side starts, and controls a length of a period between time, when image-forming on the first side of the sheet in the posture with the first side facing the recording sheet is completed, and time, when the image-forming on the second side of the sheet inverted and refed to the sheet conveyer starts, based on the determined initial arrangement of the sheet in the sheet conveyer.

Abstract: A sheet conveying device includes a conveying roller configured to convey a sheet and a plurality of driven rotating units. The conveying roller includes a plurality of roller portions disposed at positions opposite to the driven rotating units. Each of the roller portions has three or more annular grooves arranged side by side. Each of the driven rotating units includes three or more driven rotating bodies that are disposed at positions opposite to the annular grooves, respectively. A plurality of convex portions and a plurality of concave portions are alternately provided on an outer edge of each of the driven rotating bodies. The driven rotating bodies include two first rotating bodies positioned at both ends and one or more second rotating bodies located between the first rotating bodies and having an outer diameter smaller than the outer diameter of the first rotating bodies.

Abstract: An image forming apparatus forms a second image on a sheet including a previously formed first image. The image forming apparatus includes a reading apparatus, a controller, and an image forming section. The reading apparatus reads the first image to generate first image data. The controller acquires first formation area data indicating an area in which the first image is formed based on the first image data. The image forming section forms a second image on a recording surface of the sheet based on second image data. The controller acquires second formation area data indicating an area in which the second image is to be formed based on the second image data. The controller executes a comparison process to compare the first and second formation area data. The controller determines whether or not to form the second image on the recording surface based on a comparison process result.

Abstract: A web transporting method includes a drive roller (Gd), N (where N is an integer of 1 or greater) driven rollers (Gn) which nip a wound portion of a web between the drive roller and the driven rollers, and a tension application unit which applies a tension Tl to a portion of the web which is one side of the wound portion and applies a tension Th which is higher than the tension Tl to a portion of the web which is opposite the one side of the wound portion, in which an angle ?0, an angle ?(n), a load P(n), a static friction coefficient ?0, and a static friction coefficient ?(n) satisfy a predetermined relational expression (expression 1).

Abstract: A printer includes a first roller and a second roller that pinch a paper sheet therebetween and rotate to transport the paper sheet to the recording unit, a roller support member that support the second roller and is capable of switching between a first state in which the second roller is in contact with the first roller and a second state in which the second roller is moved away from the first roller, and a slider that engages the roller support member and is linearly displaceable in the rotation axis direction of the second roller so as to perform switching by the roller support member.

Abstract: A transportation device includes a first roller that transports a sheet-shaped medium from an upstream to downstream in a transporting direction; a guide member that has a guide section extended along the transporting direction and is arranged upstream of the first roller in the transporting direction; and a second roller that is movable between a correcting position where the second roller pinches the sheet-shaped medium with the first roller and corrects a curl of the sheet-shaped medium, and a standby position where the second roller separates from the transporting passage further than the correcting position, wherein the guide member is movable to an escaping position that is separated from a moving passage that is from the correcting position to the standby position of the second roller if the second roller moves to the correcting position.

Abstract: When the user operates a paper feed button 9c while the access cover 11 is open (steps ST1, ST2), the printer 1 moves the printhead 12 from the printhead-down position 12D to the printhead-up position 12U, and moves the second paper feed roller pair 31 from the nip state to the nip-release state (step ST3). When the access cover 11 is then closed, the printer 1 returns the second conveyance roller pair 31 to the nip state, and returns the printhead 12 to the printhead-down position 12D (steps ST4, ST5). The operation for changing the second conveyance roller pair 31 between the nip state and the nip-release state is therefore intuitive, easily understood, and simple for the user.

Abstract: An ink ribbon cassette and printing apparatus capable of stably conveying an ink ribbon includes a supply shaft around which an ink ribbon is wound, a rewinding shaft around which the ink ribbon from the supply shaft is to be rewound, a guide shaft configured to abut the ink ribbon on a conveying path of the ink ribbon from the supply shaft to the rewinding shaft, and a regulation portion configured to abut the guide shaft according to a force applied to the guide shaft by the ink ribbon, thereby deforming the guide shaft to protrude toward the ink ribbon.

Abstract: There is provided a recording apparatus including a recording unit and a transporting mechanism to transport a recording medium. The transporting mechanism includes, a guide surface to guide an end portion, of the recording medium, in a direction intersecting with a transporting direction of the recording medium, and a pair of rollers arranged, in a direction orthogonal to the guide surface, at a position between the guide surface and a central portion of the transporting path. The pair of rollers includes, a driving roller to transport the recording medium, and a driven roller having a rotary portion facing a recording surface, of the recording medium, on which the image is recorded, and configured to rotate about a rotation axis thereof following movement of the recording medium, and a first shaft to support the rotary portion rotatably. The rotary portion is supported rockably with respect to the first shaft.

Abstract: A roll-to-roll printing system includes driven rolls to apply a feeding force to a flexible substrate so that the flexible substrate is fed from an unwinder to a rewinder, nip rolls respectively disposed above two opposite end portions of each of the driven rolls to pressurize two opposite side portions of the flexible substrate, nip roll driving motors connected to the nip rolls to rotate the nip rolls, and a control unit to receive information regarding change of torque values of the nip roll driving motors and control tension of the flexible substrate based on the information.

Abstract: A document-feeding roller mechanism includes a feeding roller assembly and a clamping-force adjusting module. The feeding roller includes a roller frame, a first roller unit, and a second roller unit. A document is conveyed by the first and second roller units through a printing module. The clamping-force adjusting module includes a cam unit and a resilient pressing unit. The resilient pressing unit is disposed between the roller frame and the cam unit. When the cam unit is rotated, the biasing force of the resilient pressing unit applied to the roller frame can be adjusted to change the document clamping force of the first and second roller units. Hence, just before a trailing end of the document is separated from the first and second roller units, the document clamping force can be reduced.

Abstract: A method of controlling transport amounts of a pair of first rollers and a pair of second rollers, the pair of first rollers operable to nip a medium so as to transport the medium in a transport direction, the pair of second rollers operable to nip the medium so as to transport the medium and disposed at a downstream side of the pair of first rollers in the transport direction, the medium on which a recording is performed by a recording head disposed between the pair of first rollers and the pair of second rollers, the method includes performing a first correction with respect to the transport amounts of the pair of first rollers and the pair of second rollers; and performing a second correction with respect to the transport amounts of at least the pair of first rollers, from a state in which length between a trailing end of the medium and a nip point of the medium at which the medium is nipped by the pair of first rollers is a predetermined length to a state in which the medium is released from being nipped

Abstract: A rotary shaft locking device includes a locking unit having a transmission gear receiving rotary torque from a power source, transmitting rotary torque to a rotary shaft as the transmission gear receives rotary torque from the power source, and locking the rotary shaft as transmission of rotary torque from the power source is cut off, and a first planetary gear and a second planetary gear provided to be meshed with a sun gear and to planetarily move around the sun gear, and displaced between a meshed position and an unmeshed position so as to be meshed with and separated from the transmission gear. The locking unit locks the rotary shaft for a power cutoff time which occurs when the rotation direction of the sun gear is switched and for which the transmission gear is not meshed with both the first planetary gear and the second planetary gear.

Abstract: A printer includes printing unit provided on a conveying path of a recording sheet and sheet feed unit provided on the downstream and upstream sides of the printing unit in a conveying direction of a recording sheet. The printer includes a platen roller, a first sheet feed roller, a second sheet feed roller, a first branch transmission gear group, a second branch transmission gear group, and thrust amount adjusting unit. A tooth trace of one of the gears of each of the first and second branch transmission gear groups has an inclination angle with respect to an axial direction, and the first and second branch transmission gear groups are formed of first and second idler gears including inclined gear portions of which inclined directions of tooth traces are the same as each other.

Abstract: A medium transport apparatus includes a feeding roller configured to rotate around a rotational axis. A guide rail extends along the rotational axis. A slider is supported by the guide rail and movable along the rotational axis. A rotatable pinch roller is configured to clamp medium between the feeding roller and the pinch roller to move the medium. A lever is connected to the pinch roller and movable to change a clamping state with respect to the medium between the feeding roller and the pinch roller. An arm is connected to the slider and configured to take an engaging position where the arm moves the lever to change the clamping state when the slider moves along the rotational axis and a standby position where the arm is not engaged with the lever when the slider moves along the rotational axis.

Abstract: There is provided a recording apparatus in which a pressure contact position of a pinch roller to a conveying roller and a distance between the pressure contact position of the pinch roller and a platen can be properly set corresponding to different recording conditions so that a high quality image can be recorded even under the different recording conditions. A movement of the pressure contact position in which the pressure contact position of the pinch roller 37 to the conveying roller is moved by moving a pinch roller holder and a movement of the platen in which a position of the platen which faces a recording head 7 is moved for the pressure contact position of the pinch roller are executed in an interlocking relational manner.

Abstract: Medium engaging members are rotatable about an axle. In one embodiment, the members have filed hubs asymmetrically extending towards one another. In another embodiment, the members have centers of mass such that the members lean into abutment with one another.

Abstract: A sheet feeding procedure supplies recording media from a medium enclosing portion to a medium conveying path. An overlap-feed detecting procedure monitors a thickness of recording media supplied to the medium conveying path, thereby detecting the overlap-feed media. Sheet returning procedures (A) and (B) return the overlap-feed media into the medium enclosing portion when the overlap-feed media are detected. A looseness forming procedure applies rotational forces of different rotation speeds to upper and lower surfaces of the overlap-feed media during the medium returning procedure, thereby forming a looseness in the overlap-feed media. A medium re-feeding procedure supplies again the returned recording media to the medium conveying path from the medium enclosing portion. In the medium feed control, the overlap-feed can be further certainly recovered.

Abstract: A method of interrupting a printing operation in a continuous transport process in which a first roller and a second roller transports plural printing mediums including a first medium on a tray in a transport direction to a printing area at which the printing operation is performed to each printing medium, the second roller is arranged at a downstream side of the first roller in the transport direction, and a third roller comes in contact with the first roller at a contact point to transport the printing mediums together with the first roller and is separated from the first roller not to transport the printing mediums, the method includes: separating the third roller from the first roller, when a trailing end edge of the first medium at least apart of which is disposed in the printing area is located at an upstream side of a predetermined point in the transport direction, and driving the second roller to transport the first medium after the third roller is separated from the first roller.

Abstract: A printing apparatus and method are capable of printing an image in a rear end area of a print medium. A sheet is transported by a transport roller and pinch rollers situated upstream of a print head with respect to the transport direction, and by a discharge roller and spurs situated downstream of the print head. After the sheet has left the transport roller and the pinch rollers, it is transported by the discharge roller and spurs. The sheet is printed with a test pattern for detecting a difference between a transport amount appearing before the sheet leaves the transport roller and pinch rollers and a transport amount appearing when the sheet leaves them. Based on a correction value set according to a printed result of the test pattern, the transport amount used when the sheet leaves the transport roller and pinch rollers is corrected.

Abstract: A method of controlling transport amounts of a pair of first rollers and a pair of second rollers, the pair of first rollers operable to nip a medium so as to transport the medium in a transport direction, the pair of second rollers operable to nip the medium so as to transport the medium and disposed at a downstream side of the pair of first rollers in the transport direction, the medium on which a recording is performed by a recording head disposed between the pair of first rollers and the pair of second rollers, the method includes performing a first correction with respect to the transport amounts of the pair of first rollers and the pair of second rollers; and performing a second correction with respect to the transport amounts of at least the pair of first rollers, from a state in which length between a trailing end of the medium and a nip point of the medium at which the medium is nipped by the pair of first rollers is a predetermined length to a state in which the medium is released from being nipped

Abstract: An image generating apparatus includes a rotatable roller for carrying a paper, provided movably in an axial direction, a roller gear fixedly mounted on the roller, a drive gear meshing with the roller gear and driven by a driving source, and a position adjustment member regulating an axial position of the roller gear so as to hold the roller gear from axial both sides while capable of moving the roller gear to a separate position for separating the roller gear and the drive gear from each other in a state of applying no pressing force to the roller gear and to a mesh position for meshing the roller gear and the drive gear with each other in carrying the paper.

Abstract: A cylindrical shaft which is formed in a cylindrical shape by pressing process in a state in which a pair of ends are opposite to each other is disclosed. A joint is formed between the pair of ends, and includes a plurality of intersection portions extending in a direction intersecting with an axial direction of the cylindrical shaft, a first straight portion connecting the ends of one side each of the pair of adjacent intersection portions, and a second straight portion connecting the ends of the other sides of the pair of adjacent intersection portions and being shorter than the first straight portion. A distance between the pair of ends at the first straight portion is shorter than a distance between the pair of ends at the second straight portion.

Abstract: The method comprises the steps of feeding media from a media roll, arranged about an axis, through an input driving device and an output driving device of the media advance mechanism, wherein the output driving device engages the media with lower friction than said input driving device; releasing said input driving device such that it does not engage the media; and causing the media to move in the media advance mechanism such that the media is pulled taut between the roll and the output driving device and later the media slips with respect to said output driving device, whereby the media is aligned at right angles to the roll axis by effect of the friction between the media and the output driving device.

Abstract: A document feeder device is disclosed. The document feeder device includes a frame and at least one cantilevered roller shaft for advancing a document, where an unsupported end of the at least one cantilevered roller shaft floats. The document feeder device eliminates the need for a rigid frame to support the unsupported end. This decreases the cost of production by eliminating the need for additional frame hardware and/or more rigid frame hardware. The document feeder device can be implemented in existing designs.

Abstract: A conveying roller is disposed downstream of a feeding roller in a conveying direction and conveys a sheet of recording medium to a printing position along a conveying path. A medium detecting unit is disposed between the feeding roller and the conveying roller along the conveying path and detects the sheet of the recording medium. A printing unit performs printing at the printing position. A target-rotational-amount setting unit sets a target rotational amount for feeding the sheet of the recording medium to the conveying roller, based on a rotational amount of the feeding roller measured from when the feeding roller begins feeding the sheet of the recording medium accommodated in the feeding cassette until the medium detecting unit detects the sheet of the recording medium. A controller controls the feeding roller to continue rotating until the rotational amount of the feeding roller reaches the target rotational amount.

Abstract: A paper feed mechanism is provided. The paper feed mechanism includes a pair of paper feed rollers at the upstream side and the downstream side of a printing device in a direction in which a recording paper is fed during printing, and press contact rollers in press contact therewith. The back surface of the recording paper receives a pushing force from projections formed on the pair of paper feed rollers by a predetermined depth such that the recording paper is fed during printing by the printing device.

Abstract: A method for controlling the media feed of a print media sheet in an imaging apparatus having a media feed roller includes selecting between using absolute positioning of the media feed roller and relative positioning of the media feed roller for various media feed roller moves.

Abstract: A liquid ejection head is operable to eject a liquid droplet toward a medium at a liquid ejection point A first roller transports the medium toward the liquid ejection point. A second roller ejects the medium transported from the liquid ejection point to the outside of the apparatus. At least one detection roller is directly brought into contact with the medium and is rotated in accordance with the transportation of the medium, the at least one detection roller being disposed in the vicinity of at least one of the first roller and the second roller. A detector detects a rotation amount of the detection roller. A controller controls the transportation of the medium in accordance with the rotation amount.

Abstract: A print media moving apparatus is disposed in a printer for controlling movement of a print media. The print media moving apparatus includes a motor, a first media moving module, a second media moving module, a controlling module, a first power transmission module and a second power transmission module. The first and second media moving module are both coupled to the motor. The controlling module is coupled to the first and second media moving modules, and is for turning on the first media moving module when the printer operates under a first mode, and turning on the second media moving module when the printer operates under a second mode. The first and second power transmission modules are respectively coupled between the motor and the first and second media moving modules, and are respectively for delivering power from the motor to the first and second media moving modules.

Abstract: A medium transport apparatus includes a feeding roller configured to rotate around a rotational axis. A guide rail extends along the rotational axis. A slider is supported by the guide rail and movable along the rotational axis. A rotatable pinch roller is configured to clamp medium between the feeding roller and the pinch roller to move the medium. A lever is connected to the pinch roller and movable to change a clamping state with respect to the medium between the feeding roller and the pinch roller. An arm is connected to the slider and configured to take an engaging position where the arm moves the lever to change the clamping state when the slider moves along the rotational axis and a standby position where the arm is not engaged with the lever when the slider moves along the rotational axis.

Abstract: When the trailing edge of a recording sheet is released from a nip of a first pair of rollers which hold and convey the recording sheet, on the upstream side in the conveyance path, a variance of electric power for driving the first pair of rollers is detected, and image data to be outputted to the print head is shifted to the upstream side in the conveyance direction of the recording sheet, so that the print head is driven. As a result, it is possible to prevent the positional shift of image due to the conveyance error of the recording sheet caused when the recording sheet is released from the nip.

Abstract: A method for feeding a recording medium includes the steps of: feeding the recording medium along a sheet-feeding path by a unit feeding amount, detecting an entrance of a rear end of the recording medium into a jumping alarm area, dividing the unit feeding amount into minute divisional feeding amounts such that the recording medium is fed by each minute divisional feeding amount when the rear end of the recording medium enters the jumping alarm area, detecting a jumping amount of the recording medium corresponding to a rotation of a driving roller when a jumping phenomenon occurs in the recording medium, and adjusting the minute divisional feeding amount to cancel the jumping amount.

Abstract: A printer having a paper discharge mechanism which reliably prevents recording paper after completion of the printing operation from being pulled back inside the printer. The printer includes a paper feed roller 62 located on the upstream side of the printing position 83 along the horizontal paper transportation path of the printer. A paper cutting mechanism 67 is located downstream from the printing position. A pressure roller 66 presses the recording paper against a discharge roller 65 from the top side of the paper transportation path. A reversing-prevention lever 80 is disposed coaxially and freely rotatably to the pressure roller 66. The center of gravity of the reversing-prevention lever 80 is downstream from the axis of rotation 66e of the pressure roller 66, and the weight of the reversing-prevention lever 80 causes the reversing-prevention lever 80 to contact the top of the discharged paper 10.

Abstract: A sheet carrier, includes an upstream side sheet carriage part; a downstream side sheet carriage part; an overlapping detection part which is provided between the upstream side sheet carriage part and the downstream side sheet carriage part and is configured to detect an overlap of a front sheet and a rear sheet carried by the upstream side sheet carriage part and the downstream side sheet carriage part; and a driving control part configured to drive the upstream side sheet carriage part and the downstream side sheet carriage part at the time when the sheets are carried so that the sheets are carried via the sheet carriage path, and configured to stop driving the upstream side sheet carriage part and continue driving the downstream side sheet carriage part at the time when the overlap of the sheets is detected by the overlapping detection part.

Abstract: A document feeder method is disclosed. The document feeder method includes providing at least one cantilevered roller shaft in the printer for advancing the document, and coupling a supported end of the at least one cantilevered roller shaft to a frame of the printer such that an unsupported end of the at least one cantilevered roller shaft floats. This decreases the cost of production by eliminating the need for additional frame hardware and/or more rigid frame hardware. The document feeder method can be implemented in existing designs.

Abstract: An apparatus for transporting a sheet recording medium (12) has an entrance drive roller (16) paired with a corresponding entrance pressure roller (18) to form an entrance nip (14) for transporting the sheet recording medium (12) into a scanning section (20) between the entrance nip (14) and an exit nip (24). The exit nip (24) is formed by an exit drive roller (26) with a corresponding exit pressure roller (28) for transporting the recording medium (12) out from the scanning section (20). At each end of the entrance pressure roller (18), an entrance pressure roller actuation arm (120) actuates the entrance pressure roller (18) to exert variable force against the entrance drive roller (16). At each end of the exit pressure roller (28), an exit pressure roller actuation arm (130) actuates the exit pressure roller (28) to exert variable force against the exit drive roller (26).

Abstract: A printer less susceptible to paper jams, allowing reduction in number of components and having superior printing precision is provided. The printer includes a chassis, a printing portion mounted on the chassis for printing on a sheet of recording paper, a press roller rotatably mounted on the chassis, kept at an approximately constant distance from the printing portion for pressing the sheet of recording paper, a feed roller rotatably mounted on chassis, movable in directions toward and away from the press roller and holding the sheet of recording paper in close contact with the press roller, and a spring urging the feed roller to the press roller. The chassis has a guide portion extended to guide a sheet of recording paper between the press roller and the feed roller.

Abstract: A medium pickup unit including a pickup roller, having a circumferential section and a non-circumferential section, to rotate and to pick up a medium due to friction between the circumferential section and the medium, idle rollers respectively disposed at opposite ends of the pickup roller to maintain an orientation of the medium once the non-circumferential section of the pickup roller faces the medium during the rotation of the pickup roller, and a connecting unit coupled to the pickup roller to cause the idle rollers to rotate together.

Abstract: An inkjet printer includes a single transport roller (4), two first driven rollers (A: A1, A2), two first driven rollers (B: B1, B2), and a single first driven roller (C). The rollers (A1, A2, B1, B2, C) are rotatably held by holders (8a to 8e) at respective downstream ends thereof. The holders (8a to 8e) are aligned with one another along a fast scanning direction and are rotatably supported at upstream ends thereof by a support shaft (81). The holders (8a to 8e), the shaft (81), and a plurality of springs (9) are assembled into a holder assembly (8). The holder assembly (8) has the shaft (81) fixed to a main frame (1). The springs (9) are fixed at one end to respective middle portions of the holders (8a to 8e), and at the other end to the frame (1).

Abstract: A printing device comprises a feed mechanism configured to advance the printing medium intermittently. The feed mechanism is adjusted so that an average feed error ?ave is in the vicinity of zero with respect to a most slippery printing medium among plural types of printing media designed to be used in the printing device. Alternatively, a printing device comprises a controller to correct a feed amount such that an average feed error ?ave is in the vicinity of zero with respect to at least one specific printing medium among plural types of printing media designed to be used in the printing device.

Abstract: An apparatus for recording an image onto a sheet medium (12) has an entrance drive roller (16) paired with a corresponding entrance pressure roller (18) to form an entrance nip (14) for transporting the sheet medium into an image recording section (20). The image recording section has a write head (56) for recording onto a portion of the sheet medium being transported between the entrance nip (14) and exit nip (24). The exit nip is formed by a drive roller (26) paired with a corresponding exit pressure roller (28) for transporting the sheet medium out from the image recording section. A motor (60) provides rotary motion to a pinion roller (40) mechanically coupled to the entrance and exit drive rollers (16, 26). A loading mechanism provides a loading force to nest the pinion roller into rotational contact against a portion of the entrance and exit drive rollers (16, 26).

Abstract: A backup roller is formed by a member having a rotational axis and a circumferential region around which a plurality of teeth are arranged. Each tooth of the plurality of teeth has a tip end extending in a direction away from the rotational axis. When the backup roller is rotated the tip end of each of the plurality of teeth sequentially extends toward the rotational axis of a drive roller at an angle non-orthogonal to the rotational axis of the drive roller.

Abstract: An encoder is adapted to be opposed to a scale provided with a plurality of marks or slits arranged in a first direction at predetermined intervals. A plurality of detectors is arranged in a second direction perpendicular to the first direction while being staggered in the first direction, each of which detects a position of each of the marks or slits, and the plurality of detectors being operable to respectively output an detection signal which has a first frequency. A first signal generator is operable to generate an first output signal which has a second frequency which is 2n-times of the fist frequency based on the detection signal output from a first detector of the plurality of detectors. A second signal generator is operable to generate a second output signal which has the second frequency based on the detection signal output from a second detector of the plurality of detectors.

Abstract: In a thermally transcribing printer including a frame, a roller made of a metal for feeding sheet at constant speed, a gear made of a resin, a motor, a press-fit engaging member, and a compression coil spring, the roller includes a shaft portion attached to project from an inner side to an outer side of the frame 1 and the press-fit engaging member is press-fitted to the shaft portion. Further, the gear includes a shaft inserting hole in a circular shape inserted from an outer side of the press-fitted engaging member made of a metal into a shaft portion of the roller, and four second engaging portions provided at intervals of 90 degrees between the shaft inserting hole and an outer peripheral portion of the gear and having a predetermined length in a rotational direction.