摘要:
A fixing device includes a fixing roller, a single heating member that heats the fixing roller, a pressure roller, a first temperature detecting element that detects the temperature of the contact region, of the fixing roller, that comes into contact with the recording paper transported, and a second temperature detecting element that detects the temperature of the noncontact region of the fixing roller. The fixing device carries out energization control of the heating member based on the temperature detected by the first temperature detecting element and stops energization control of the heating member when the temperature detected by the second temperature detecting element reaches a prescribed temperature.
摘要:
An image forming apparatus includes a history storage portion for storing the usage history involving the number of prints of the image forming apparatus, and a processing time controller for changing the time of the pre-processing operation before or the time of the post-processing operation after a printing process of the printing portion, based on the stored usage history so as to exclude the influence of the unfixed developer on the printing process.
摘要:
One embodiment of an image forming apparatus according to the present invention is an image forming apparatus in which registration rollers are arranged immediately before an electrostatic latent bearing member and, after a carried paper is caused to temporarily stop by the registration rollers, carrying of the paper recommences with a timing enabling a leading edge of image information visualized on the electrostatic latent bearing member and a leading edge of the paper that has been stopped by the registration rollers to correspond, wherein, at a time of successive printing of multiple sheets, a carrying recommencement timing of an immediately subsequent paper is determined using information of a carrying recommencement timing of an immediately preceding carried paper.
摘要:
A link member interlinks an external member forming part of a cabinet of an apparatus and an internal member capable of pivoting about a pivot shaft located more deeply inside the apparatus than the external member for causing the internal member to pivot in cooperation with the external member pivoting. The link member has a stretchable length and is provided with a resilient biasing member biasing the link member in such a direction as to stretch the length. When the external member is in its closed position, the internal member is positioned to abut a predetermined contact portion by the biasing force of the resilient biasing member. Parts storage shelves are provided in the space defined between the external member and the internal member.
摘要:
A sheet feeding device of an image forming apparatus receives various operations such as an operation to start an image formation and output process (step S101), inhibits opening and closing of a feeding route interlocked with opening and closing of a storage section if the received operation or a process executed based on the operation satisfies a preset predetermined condition (step S103), and then starts the image formation and output process (step S104).
摘要:
An image forming apparatus includes a photoreceptor drum, a developing roller, a registration roller for positioning and conveying the paper and a drive controller for controlling the drive of the registration roller. The registration roller conveys the paper so that its leading end collides with the photoreceptor drum. The drive controller corrects the timing of driving the registration roller based on the detected eccentric variation of the peripheral surface of the photoreceptor drum and the rotational phase. The drive controller may acquire the eccentric variation as external data instead of detecting it.
摘要:
A guide member, which is constituted by an upper paper guide and a lower paper guide that form a paper transport path, is arranged between registration rollers and pre-registration rollers. At least one of the upper paper guide and the lower paper guide is supported swingably during printing operation.
摘要:
The invention provides a fixing unit including a fixing roller and a pressure roller pressed against the fixing roller inside a housing, for holding and conveying a sheet carrying an image formed by a developer between the fixing roller and the pressure roller thus to fix the image onto the sheet, including a removal section that removes an unfixed developer adhered to the fixing roller or the pressure roller, and an air vent located close to the removal section.
摘要:
In a paper-punching device for use in an image-forming apparatus, the rear edge of a sheet of paper that is being transported through a transport guide is detected by the photosensor. After a predetermined time has passed since the detection, a punching device is activated. At this time, a punching member is depressed downward, and a punching blade attached to its top penetrates through the sheet of paper, thereby forming a punch hole. Even during the punching operation, transport rollers continue to rotate. Therefore, when the sheet of paper is caught by the punching blade, the transport rollers are allowed to slip predetermined amount with respect to the paper. For this reason, at least one of the transport rollers is made of a foamed material. With this arrangement, since the punching operation is carried out on the rear side of the sheet of paper, it becomes possible to reduce the occurrence of paper jams even if sheets of paper are transported in succession. Further, the punching operation is carried out while the paper is being transported; this makes it possible to provide a high-speed operation. Further, even if the sheet of paper is caught by the punching blade, it is not damaged because of the slip that is provided.
摘要:
An image forming apparatus provided with a photoreceptor with an internal gear includes the internal gear in a photoreceptor drum, a pinion gear in engagement with the internal gear, and a cleaning unit and a developer unit which apply contact pressure onto the photoreceptor drum. The pinion gear is provided in such an area that a resulting force of the contact pressure respectively applied from the process elements does not cause a distortion of the photoreceptor drum which exceeds an axial backlash determined in initialization according to a distance between axes of the pinion gear and the internal gear. The described arrangement prevents interference between non-driving surfaces of the internal gear and the pinion gear. As a result, a smooth rotary motion of the photoreceptor drum can be ensured, thereby preventing an image defect caused by an unstable rotary motion of the photoreceptor drum.