Abstract: A print media feed system comprises: a drive unit configured to move a feed roller; a sensing unit configured to sense movement of a feed roller; a detection unit configured to detect movement of a pinch roller; and a controller arranged to control the drive unit using a gain parameter and signals provided by the detection unit and the sensing unit. If it is detected that the pinch roller is in a first position in which the pinch roller presses against the feed roller such that a print media is between the pinch roller and the feed roller, the gain parameter is set to a first value. If it is detected that the pinch roller is not in the first position, the gain parameter is set to a second value which is lower than the first value.

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 printer including: at least one elongate roller arranged, in use, to rotate so as to transport print media within the printer; a support frame for supporting the roller at the longitudinal first and second ends of the roller so as to allow the rotation of the roller; and fixing means for fixing the roller to the support frame at the first end of the roller, the fixing means including: a bearing into which the first end of the roller is positioned for allowing the rotation of the roller; and engagement means arranged to slidably engage with the support frame so as to fix the roller thereto, the bearing being configured to allow pivotal movement of the elongate roller about the second end of the roller during the sliding engagement of the engagement means and support frame.

Abstract: A paper pickup apparatus in a printer for pivotally moving by a motor includes a driving shaft rotated by the motor, a first pickup housing having at least one first transmission gear and first and second end portions, the first end portion mounted to the driving shaft, the first transmission gear transmitting torque from the driving shaft, a second pickup housing having at least one second transmission gear and being rotatably mounted to the second end portion of the first pickup housing, the second transmission gear transmitting torque from the first pickup housing, a connecting portion for connecting the first and second pickup housing with each other, the first pickup housing being rotatable to the second pickup housing centering thereon, and a pickup roller mounted to the second pickup housing and rotated by torque from the second transmission gear.

Abstract: A common printer platen for conveying printed media and documents to a printer exit includes an exit mechanism having a series of floating spaced guide ribs to accommodate printed media or documents of a first range of thickness and printed media or documents of a second range of greater thickness. An exit chassis includes a longitudinal first edge, a series of spaced guide ribs including an integral beam forming a star wheel carrier is pivotably mounted transversely to the chassis first edge, and spring members extend between the chassis and the beams for accommodating printed media or documents of a greater thickness conveyed through a nip formed by the star wheels and a printer roller.

Abstract: A sheet feeding device for feeding sheets from a sheet input side to a sheet output side, the sheet feeding device comprising a rotatable sheet feed roller; a pressing roller disposed in confrontation with the sheet feed roller so that a sheet sandwiched between the pressing roller and the sheet feed roller contacts the sheet feed roller at a contact position and is fed from the sheet input side to the sheet output side by rotational force of the sheet feed roller, a tangential plane passing through the contact position dividing space between a sheet feed roller side and a pressing roller side; a reference surface disposed at the sheet output side in intersection with the tangential plane; an arm swingably supporting the pressing roller in confrontation with the sheet feed roller; and a swinging axis swingably supporting the arm and disposed at the sheet input side and at the pressing roller side.

Abstract: A borderless printer includes a clamp assembly having a clamp; at least one roller installed on the clamp and located on the circumferential surface of a drum and rotating while in contact with the drum; and a clutch placed between the clamp and drum, for permitting the drum to rotate relative to the clamp in one condition and for permitting the drum and clamp to rotate together in another condition, thereby simplifying the structure and preventing the waste of paper.

Abstract: A carriage support system for a computer driven printer/plotter employs a slider rod and a slider bar mounted parallel to each other on a printer chassis wherein the bar supports the front side of a printer carriage and the rod supports the rear side of the carriage thus eliminating expensive centerless ground carriage support rods. The slider bar also has a plurality of dual edge paper pinch wheels supported thereon which are biased into engagement with the paper or other medium on which printing takes place by a plurality of springs integrally formed from a single member affixed to the slider bar.

Abstract: A printer with a printing paper feeding apparatus is disclosed.The printer comprises a pressing device for pressing a printing sheet on the platen roller which is operable to an open position to allow the sheet to pass freely, a detection device for detecting a position of the sheet being fed along said platen roller by said sheet feeding device and an operation device for moving the pressing device from a said first position to a second position or vice versa according to the position of the sheet detected by the detection device.

Abstract: A guide shaft guides a print head, which moves along a print line of a platen to perform a printing operation. A rotating member and an eccentric cam member, having a toothed sector portion on its periphery, are mounted on the guide shaft. The guide shaft is guided on a frame by a bearing slot, so as to be movable toward and away from the platen. The eccentric cam member rotates as it is always spring-urged to engage a fixed engaging pin. As a result, the guide shaft moves in a direction transverse to its axis, thus changing a gap between the print head and the platen. As the eccentric cam member rotates in one direction, the print head moves away from the platen, in a retreat stroke. In a rear half of the retreat stroke, the toothed sector portion of the rotating member engages a toothed arm, which is connected to a paper bail member for holding a printing medium down on the platen.

Abstract: The present invention relates to a laser scanning apparatus, which includes a drivingly rotatable subscanning drum and at least one nipping roller rotatable by the drum in pressing contact therewith and having an outer peripheral surface provided by an elastic member. The drum and the roller have their axes spaced at a constant distance from each other at all times for transporting a sheet when nipped therebetween, so that the sheet, while being transported, can be scanned with a laser beam in a direction perpendicular to the direction of transport of the sheet.

Abstract: A paper feed mechanism comprises first and second rotating members rotated by a drive source, and pressing means swingable in a first direction to contact to and separate from the first rotating member and movable in a second direction crossing to the first direction to contact to and separate from the second rotating member. The pressing member selectively presses the first rotating member or the second rotating member to feed a record paper.

Abstract: An easily adjustable and automatically aligning pinch roller assembly for use in a graphics plotter. A movable carriage hangs from a supplemental inverted T-shaped track below the main carriage track of the plotter. The pinch roller is pivotally attached to an arm from the carriage. A leaf spring on the carriage pulls the carriage loosely into positional alignment with the pinch roller aligned with the drum while allowing translational movement easily. A second bias spring urges the pinch roller down and the carriage into gripping engagement with the supplemental track with sufficient force to prevent translational movement thereof. A release bar holds the pinch roller off the drum and releases the gripping force to allow the carriage to be slid for adjustment.