摘要:
There is described an image forming apparatus, which forms high quality images free from a phenomenon of inter-sheet adhesion. The image forming apparatus includes a conveyance section to convey the transfer material along a conveying path; a cooling device disposed along the conveying path to cool the transfer material just after the toner image is fixed with heat; a controller-to control the conveyance section and the cooling device; and a first transfer-material detecting device disposed at a position adjacent to and upstream from the cooling device, in order to detect the transfer material coming into the conveying path. When the first transfer-material detecting device detects the transfer material coming, the controller controls the conveyance section to decelerate a conveyance velocity of the transfer material to a decelerated velocity lower than a normal conveyance velocity, so that the transfer material passes through the conveying path at the decelerated velocity.
摘要:
An image forming apparatus has a transfer attitude correcting section for correcting a transfer attitude of the transfer sheet to receive the toner image and for conveying the corrected transfer sheet to the transfer section with a timing to match with the movement of the toner image. The transfer attitude correcting section includes a roller unit including a base board rotatable around a center of rotation and a registration roller mounted on the base board, a detecting section for detecting a position of the transfer sheet being conveyed by the registration roller; and a control section for control the roller unit based on detection data detected by the detecting section so as to correct a skew of the transfer sheet by rotating the base board and to correct a deviation of a transfer position of the transfer sheet by shifting the registration roller on the base board.
摘要:
An image forming apparatus has a transfer attitude correcting section for correcting a transfer attitude of the transfer sheet to receive the toner image and for conveying the corrected transfer sheet to the transfer section with a timing to match with the movement of the toner image. The transfer attitude correcting section includes a roller unit including a base board rotatable around a center of rotation and a registration roller mounted on the base board, a detecting section for detecting a position of the transfer sheet being conveyed by the registration roller; and a control section for control the roller unit based on detection data detected by the detecting section so as to correct a skew of the transfer sheet by rotating the base board and to correct a deviation of a transfer position of the transfer sheet by shifting the registration roller on the base board.
摘要:
There is described an image forming apparatus, which forms high quality images free from a phenomenon of inter-sheet adhesion. The image forming apparatus includes a conveyance section to convey the transfer material along a conveying path; a cooling device disposed along the conveying path to cool the transfer material just after the toner image is fixed with heat; a controller-to control the conveyance section and the cooling device; and a first transfer-material detecting device disposed at a position adjacent to and upstream from the cooling device, in order to detect the transfer material coming into the conveying path. When the first transfer-material detecting device detects the transfer material coming, the controller controls the conveyance section to decelerate a conveyance velocity of the transfer material to a decelerated velocity lower than a normal conveyance velocity, so that the transfer material passes through the conveying path at the decelerated velocity.
摘要:
A heater control apparatus is provided for controlling a plurality of heaters used for fixing operations of an image forming apparatus, wherein each of the heaters is incorporated inside one of a plurality of rollers. The heater control apparatus includes: a plurality of switching elements to switch flowing paths of electronic currents supplied to the heaters from a common power source; a switching control section to control the switching elements so that a connecting mode of the heaters is changeable between a serial connection mode and a parallel connection mode; and a plurality of temperature detecting devices to detect temperatures of the rollers heated by the heaters, each of the temperature detecting devices corresponding to each of the rollers. The switching control section controls the switching elements so as to change the connecting mode of the heaters according to temperature conditions of the rollers.
摘要:
There is described an image-forming apparatus for forming a toner image on a recording medium, a size of which is larger than that of the toner image being a fixed form size, based on image data corresponding to the fixed form size. The image-forming apparatus includes an image-forming section to form the toner image in a region of the fixed form size, based on the image data corresponding to the fixed form size, and to form a specific toner image in a specific region outside the fixed form size, both the region and the specific region being shared each other within a whole area of the recording medium; and a controlling section to control the image-forming section so as to form a predetermined patch image, serving as the specific toner image, in the specific region outside the fixed form size.
摘要:
An image forming apparatus includes: a writing device for writing an image on the basis of image data thereof; a controller for controlling a writing position in a primary scanning direction by the writing device; a conveying device for conveying a recording material; and a position detecting sensor for detecting an edge of the recording material, which is conveyed by the conveying device in the primary scanning direction as an absolute position. The controller determines the writing position in the primary scanning direction by the writing device on the basis of a position of the edge of the recording material in the primary scanning direction detected by the position detecting sensor, and controls the writing position of the writing device in the primary scanning direction.
摘要:
A speed controlling circuit for controlling an optical scanning system driving motor in use with an image forming apparatus such as a copier and a printer. The speed controlling circuit includes; an encoder for generating pulse signals according to a rotation of the optical scanning system driving motor; a generating circuit for generating reference clock signals; a first memory for storing a first set of numbers for dividing a frequency of the pulse signals; a second memory for storing a second set of numbers corresponding to a target rotation speed of the optical scanning system driving motor; a first setting circuit and a second setting circuit for respectively reading one of the first set of numbers from the first memory and one of the second set of numbers from the second memory, and for setting those numbers at every predetermined interval time while the optical scanning system driving motor is accelerating or decelerating; a frequency-dividing circuit for dividing the frequency of the pulse signals according to the set number of the first set of numbers; a detecting circuit for detecting a rotating speed of the optical scanning system driving motor according to the reference signals and pulse signals at every frequency period which is divided by the frequency-dividing circuit; a comparator circuit for comparing the rotating speed, detected by the detecting circuit, with the set number of the second set of numbers at every frequency period which is divided by the frequency-dividing circuit; and a control circuit for controlling the rotating speed of the optical scanning system driving motor according to a result of the comparing of the comparator circuit.
摘要:
An electric circuit provided with an abnormal condition detector for a motor, for use in a toner image forming apparatus, includes a current detection circuit for detecting a presence of a current when a power supply circuit is switched OFF; a test circuit for confirming a line connection between a control circuit and a switch by transmitting a test signal between the control circuit and the switch and a control circuit for determining an abnormal section causing an abnormal condition of a motor.
摘要:
A toner conveyance device for conveying toner particles including: a toner mixing unit having a toner introducing portion to introduce toner particles, for mixing the toner particles from the toner introducing portion with air to make a toner fluid; a first conveyor for receiving the toner fluid in the toner mixing unit and conveying; a toner separation unit for separating the toner fluid conveyed by the first conveyor into air and toner particles, the toner separation unit having a toner discharging portion for discharging the separated toner particles to an outside; a second conveyor for conveying the air separated by the toner separation unit back to the toner mixing unit; and a tightly closed circulation path of air, formed starting at the toner mixing unit which leads to the toner separation unit through the first conveyor and returning back to the toner mixing unit through the second conveyor.