摘要:
An exposure portion scans, in an axial direction, light which is emitted from a light source based on image data of a document sheet, and applies the light to surfaces of image carriers, to form an electrostatic latent image on each image carrier. The cleaning member is disposed so as to contact with each image carrier and removes residual toner on each image carrier, to perform cleaning. The driving mechanism causes each image carrier to shuttle in the axial direction with a predetermined amplitude while the image carrier is driven to rotate. The detecting member detects positional information representing a position, in the axial direction, obtained when each image carrier shuttles. The control portion controls, based on a result of detection by the detecting member, a time when scanning on each of the image carriers by the exposure portion is to be started.
摘要:
A side wall surface of a carriage is disclosed with two first projection parts and a second projection part that define the inclination of a reflective optical sensor in its vertical direction. The two first projection parts are arranged at the same height position with a detection surface as a reference, and the second projection part is arranged at a position higher than the first projection parts with the detection surface as the reference. The second projection part has a first part higher in position from the side wall surface of the carriage than the first projection parts and has a second part lower in position than the first part. The second part has a screw hole into which a clamping member for fixing the reflective optical sensor to the second part is tightened.
摘要:
A conveying unit conveys a recording sheet. A carriage comprises a process unit for forming a latent image and developing it so as to produce a developed image on an image carrier having a rotation axis parallel to a direction along which the conveying unit conveys the recording sheet, and a fixing unit using a fixing member for fixing the developed image to the recording sheet after the developed image has been transferred to the recording sheet. A transfer unit transfers the developed image produced on the image carrier to the recording sheet. A moving unit moves the carriage on the transfer unit along a direction perpendicular to the direction along which the conveying unit conveys the recording sheet, the carriage thus repeating a go-and-return operation in which the carriage fixes a line of the developed image onto the recording sheet while moving and then returns to a predetermined position. A heating unit heats the fixing member to a predetermined temperature. A measuring unit measures the temperature of the fixing member. A heating control unit drives the heating unit so as to make the temperature of the fixing member be the predetermined temperature based on the temperature measured by the measuring unit, the driving being performed either when the carriage is located at the predetermined position or while the carriage is returning to the predetermined position after the go-and-return operations has been performed a predetermined number of times.
摘要:
A serial type electrophotography printer includes a transport mechanism for transporting a recording sheet in a transport direction, a carriage including a process part and a fixing unit, where the process part includes an image bearing member rotatable about a rotary axis parallel to the transport direction of the recording sheet and a toner developing a latent image formed by charging the image bearing member, the fixing unit includes a rotatable fixing member and a heater for heating the fixing member, and the fixing member fixes a developed image which is transferred onto the recording sheet from the image bearing member, a driving mechanism for rotating the image bearing member and the fixing member when the carriage is moved to carry out developing, transfer and fixing processes with respect to the recording sheet, and for rotating at least one of the image bearing member and the fixing member during a predetermined time other than the time when the carriage is moved to carry out the developing, transfer and fixing processes, a transfer unit confronting the carriage via the recording sheet in a main scan direction of the carriage for transferring the developed image on the image bearing member onto the recording sheet, and a moving mechanism for moving the carriage in the main scan direction which is perpendicular to the transport direction of the recording sheet.
摘要:
A fixing method for a printing machine includes the steps of (a) forming a latent image on a latent image carrier by a process unit during a time when the latent image carrier is moved in a main scanning direction substantially perpendicular to a direction in which a recording sheet is transported, (b) transferring a visible image corresponding to the latent image onto the recording sheet, and (c) performing a fixing operation on the visible image on the recording sheet at least two times by a fixing device.
摘要:
A printer which includes a latent image carrier in the form of an endless belt, a carriage moveable parallel to a lengthwise dimension of the endless belt, and a paper transport device for moving a sheet of paper perpendicular to the direction of movement of the belt. Mounted on the carriage is a condition control mechanism for putting the latent image carrier in a condition ready for writing a latent image on it, a writing mechanism for forming a latent image on the latent image carriage, a transfer unit for transferring a toner image from the latent image carrier to a recording medium, and a fixing unit for fixing the toner image on the recording medium. After a write operation, the belt is rotated on-half its length and held immoveable. The carriage, having mounted on it the condition control mechanism, writing mechanism, transfer unit and fixing unit, is then moved in the length direction of the latent image carrier and a concurrent write operation, transferring operation, and fixing operation is conducted on three separate lines of images.
摘要:
An image forming apparatus including a photosensitive drum unit (photosensitive unit) including a photosensitive body, a fixing unit for fixing a toner image transferred from the photosensitive body onto a recording material, and a vertical conveying path for conveying the recording material between the photosensitive drum unit and the fixing unit. Rails (guiding members) for guiding the removable photosensitive drum unit in a longitudinal direction are provided on the fixing unit. The rails are constituted of resin material capable of blocking heat transmitted towards the photosensitive drum unit.
摘要:
The present invention is an improved compact media web electrophotographic printer including photographic full-color, and an automatic web feeding and cutting registration apparatus and method for media web and closely spaced short printouts. This apparatus comprises an improved media web-handling unit for feeding from a recording roll, and an improved sensing system for sensing a buckle and for precisely cutting the short printout at a desired controlled length, and includes an automatic setup prior to each print cycle. In addition a color serial printer having equiangularly arranged process cartridge units movable along guide rails and which is parallel to a common transfer roll which is also seperately movable along guide rails is disclosed.
摘要:
Various methods and apparatus are disclosed for facilitating the loading, transportation, and modulation of toner particles on a print head, as well as the transfer of toner particles onto a print medium. These methods and apparatus relate to the optimization of various elements on the print head to improve the speed and control of toner particles on the print head, as well as to the alteration of the electric field in the vicinity of the end of the print head, and to the use of a scanning print head.
摘要:
A band printer having a transport mechanism, an endless photoreceptive image carrying ribbon, a latent toner imaging apparatus, a transfer mechanism, and a fixing mechanism is disclosed. The transport mechanism defines a printing medium path extending in a first direction and transports a printing medium along the printing medium path. The endless photoreceptive image carrying ribbon circulates adjacent the printing medium path in a second direction at an angle to the first direction, and the latent toner imaging apparatus is adjacent to and stationary with respect to the circulating ribbon. The imaging apparatus forms an electrostatic latent toner image on the surface of the ribbon according to received image data as the ribbon moves past the imaging apparatus, and the transfer mechanism transfers the formed toner image to the printing medium when the formed toner image is aligned with the printing medium. Thereafter, the fixing mechanism fixes the image to the printing medium.