摘要:
An image forming unit includes an elastic roller that rotates in contact with a recording medium to apply a force thereto, a rigid roller disposed facing the elastic roller and that contacts the recording medium, and a pressing device that applies pressing force to each end of the elastic roller or the rigid roller in an axial direction to press one of the elastic roller and the rigid roller against the other. The elastic roller includes a straight roller portion disposed in a specified region extending from a center of the elastic roller toward each end of the elastic roller in the axial direction, and taper roller portions that sandwich the straight roller portion in the axial direction. Each taper roller portion has an outside diameter decreasing from an outer end of the straight roller portion toward an outer end of the elastic roller in the axial direction.
摘要:
The invention relates to a device for guiding a band-type product (1) especially a metal band, comprising at least two conical deflectors (2, 2′) arranged head to foot.According to the invention, each deflector (2, 2′) comprises a fixed base (3, 3′) whereon are mounted, in the manner of satellites, a plurality of rotating guiding rolls (4, 4′) forming the same angle (A) with an axis (30, 30′) of the deflector (2, 2′), and said deflectors (2, 2′) are oriented relative to the longitudinal running axis (10) of the band (1) so that the latter comprises successively, in the running direction, an upstream portion (1a) tangent and perpendicular to an input generatrix (5a) on a first deflector (2), a central portion (1b) tangent and perpendicular, upwardly to an output generatrix (5b) of the first deflector (2) and, downwardly, to an input generatrix (5′a) on the second deflector (2′) and a downstream portion (1c) tangent and perpendicular to an output generatrix (5′b) of the second deflector (2′).
摘要:
A retard roller of non-ground surface type which is virtually free from adhesion of paper dust thereby to have an excellent friction coefficient sustain ability, and which is free from creaky noises at a relatively low sheet feeding speed; a retard roller of non-ground surface type having little variation in outer diameter; and a sheet feeder employing such a retard roller. The retard roller comprises a roller body and a shaft extending axially therethrough, the roller body having a textured roller surface comprising a multiplicity of island portions (10) and a sea portion (11) recessed from the island portions, the island portions and the sea portion each having a multiplicity of fine projections (12). The ratio S1/S2 of the total area S1 of the island portions to the area S2 of the sea portion preferably is 0.25 to 0.55. The fine projections preferably each have a height of 3 to 25 &mgr;m.
摘要:
An ink printer for printing on a recording medium using a liquid ink includes at least one rotatable member arranged in a region of a transport path of the recording medium. The rotatable member is located so as to be capable of contacting liquid ink for forming an image on the recording medium. The rotatable member includes a radially outermost perimeter portion which serves as a recording medium contacting peripheral surface. The outermost perimeter portion has an outermost edge which is continuously contactable with the printing surface of the recording medium. The bonding force with respect to the ink on the outermost edge is less than the sum of a bonding force between the recording medium and the ink on a surface of the recording medium, and the cohesive force of the ink itself on the surface of the recording medium. As a result adherence of the ink to the contacting peripheral surface of the at least one rotatable member is prevented.
摘要:
A sheet conveying device includes a metal feed roller driven by a drive source and a plastic pinch roller pressed against the feed roller. A sheet is held between the feed roller and the pinch roller, to convey the sheet to a recording unit. An elastic ring having a high wear resistance is fitted over a part of an outer surface of the pinch roller in a width direction of the pinch roller. Accordingly, the elastic deformation of the elastic ring reduces or absorbs load (impact) that causes a rear end of the sheet to flick or spring and the improper sheet feeding, when the rear end of the sheet passes through a nip portion between the feed roller and the pinch roller. Thus, variances in the sheet feeding amounts and the poor image formation are prevented.
摘要:
An air exhausting concave portion is provided on an outer peripheral surface of a paster roller that pushes a first web and a second web in their overlapped state. Both end portions of the outer peripheral surface of the paster roller are chamfered. The paster roller is formed like a crown shape.
摘要:
A sheet registration and deskew assembly including a force reducing deskew roll having deflectable ribs, and alternating grooves for enabling the ribs to deflect once the sheet is in resisting contact against a registration edge guide member of the registration assembly, thus reducing a driving force on the sheet, and hence preventing damage to the sheet as well as excessive wear on the registration edge guide member.
摘要:
A multi-layer structure roller is a muti-layer structure composed of a tubular-shaped metal-made outer cylinder section located at the outer-most position, a tubular-shaped metal-made middle cylinder section located on the inside of the outer cylinder section, and an tubular-shaped metal-made inner cylinder section located on the inside of the middle cylinder section, in which coefficient of linear expansion of the middle cylinder section is greater than the coefficient of linear expansion of the outer cylinder section, the outer cylinder section and the middle cylinder section are coupled by using the difference in heat-expansion caused by heating both cylinder sections in the state sandwiching an elastic body between both cylinder sections to be laminated, tapers are respectively provided at the inner circumference of the middle cylinder section and the outer circumference of the inner cylinder section to fit the taper of the middle cylinder section, certainly coupled with the outer cylinder section to sandwich the elastic body by expanding with heating, the taper of the inner cylinder section, being in the cooling shrinking state or the room-temperature state, and further, the middle cylinder section and the inner cylinder section are combined in the fitted state of the tapers with prevention from shrinkage caused when the middle cylinder section is changed to the room-temperature. The middle cylinder section can be attached onto the outer circumference surface with an elastic body.
摘要:
One embodiment of this invention is an elastic roller including: a roller shaft; and an elastic material member surrounding the roller shaft. The elastic material member may include: an inner layer elastic material member disposed on an outer periphery of the roller shaft, a coating layer disposed on an outer periphery of the inner layer elastic material member, a first side end part circumferential surface having a first side end part, and a second side end part circumferential surface having a second side end part. The coating layer is formed from a silicone resin having a hardness of 20 degrees or less based on a spring type hardness tester Asker C in accordance with SRIS 0101. The second side end part circumferential surface having an elastic roller diameter that gradually decreases towards the second side end part opposite to the first side end part.
摘要:
A recording apparatus includes a recording head, a transport driving roller, and a transport driven roller. The recording head discharges ink onto a transported recording medium, thereby performing recording. The transport driving roller is provided on the upstream side of the recording head in the transport direction and includes driving side roller portions and depressed portions. The driving side roller portions are rotationally driven, thereby transporting the recording medium. The diameter of the depressed portions is smaller than that of the driving side roller portions. The driving side roller portions and the depressed portions are arranged in a direction perpendicular to the transport direction of the recording medium in such a manner that at least one driving side roller portion alternates with at least one depressed portion. The transport driven roller is provided opposite the transport driving roller and includes driven side roller portions and presser rollers.