Abstract: A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, the main assembly including an output contact movable between an electrical connecting position and a retracted position retracted from the electrical connecting position, a displaceable member for moving the output contact, and an elastic function member for elastically urging the displaceable member to urge the output contact toward the retracted position away from the electrical connecting position, the process cartridge includes an electrophotographic photosensitive drum; process means actable on the electrophotographic photosensitive drum; a movable operation member movable relative to a cartridge frame, wherein when the process cartridge is inserted into the main assembly of the apparatus, the movable operation member is engageable with a fixed engageable member fixed in the main assembly of the apparatus to move relative to the cartridge frame, and is engageable with a displaceable engaging po

Abstract: A driving force transmitting apparatus includes first and second transmitting means for transmitting a driving force; a first mounting portion for mounting driving means for driving both of said first and second transmitting means; a second mounting portion for mounting driving means driving said first transmitting means and not driving said second transmitting means; and a third mounting portion for mounting driving means driving said second transmitting means and not driving said first transmitting means.

Abstract: A toner cartridge memory for detecting a toner cartridge information item is provided to shield a read/write circuit substrate from the outside. If the read/write circuit substrate is shielded from the outside, a shield member is anew installed, thus leading to an increase in the manufacturing cost of the relevant image forming apparatus. In order to shield a radiant noise with a simple arrangement, an image forming apparatus is provided which includes a unit detachably mountable on a main assembly, the unit having at least an image bearing member and a memory; an image writing unit for writing an image on the image bearing member in accordance with an image information; and a communication unit for communicating with the memory, in which the communication unit is arranged under the image writing unit; and the image writing unit functions to shield the: radiant noise emitted from the communication unit.

Abstract: In the provision of a toner cartridge memory for detecting a toner cartridge information item, it is considered to shield a read/write circuit substrate from the outside. If the read/write circuit substrate is shielded from the outside, a shield member is anew installed, thus leading to an increase in the manufacturing cost of the relevant image forming apparatus. In order to shield a radiant noise with a simple arrangement, an image forming apparatus is provided which includes a unit detachably mountable on a main assembly, the unit having at least an image bearing member and a memory; an image writing unit for writing an image on the image bearing member in accordance with an image information; and a communication unit for communicating with the memory, in which the communication unit is arranged under the image writing unit; and the image writing unit functions to shield the radiant noise emitted from the communication unit.

Abstract: A positioning control device wherein an abnormality in a position detector is judged only by use of two position signals having differing phases emitted from the position detector for effecting position detection of a movable article without using the data of movement of the movable article to be controlled. For this purpose, direction determining means are provided which are responsive to the position signals to provide normal or reverse direction signals. A logical circuit for effecting abnormality judging of the position detector is provided in a controller for emitting a position control signal corresponding to the position signal to a control circuit for effecting position control of the movable article. When an abnormal condition occurs in the position detector, the signal aspect of the position signal emitted from the position detector is varied from that during the normal operation.

Abstract: A corrosion-resistant tire rim coated with a plastic paint which is obtained by the addition of flake filler to unsaturated polyester resin or epoxy resin in order to improve the chemical-resistance.

Abstract: The present invention relates to improvements in a method of sensing a position of a movable body by directly or indirectly converting a unit movement of the movable body into digital pulse signals and an apparatus therefor. A reference position is selected at a point, at which said movable body abuts against and presses a stopper provided at a specific position within the moving range thereof. The pulse signals are counted as the movable body moves from the stopper using the reference position as a reference number. The coincidence of the number of the pulse signals counted with a first predetermined pulse number corresponding to a predetermined position is sensed so as to sense the fact that the movable body has reached a predetermined position and position sensing signals are emitted.

Abstract: In the cam-controlled "sizematic" type grinding method and apparatus therefor, a novel "in process" "gagematic" type measuring means has been introduced so as to maintain the strong points of the former and develop a new grinding method and apparatus capable of securing high precision and fine surface finish of workpieces at the same time. For attaining the above purpose (a) a novel process of comparing the timing of signals of reaching the target final dimension and lapsing of the minimum required "spark-out" grind time and (b) a compensation process for wear of the dresser point are introduced.

Abstract: In the cam-controlled "sizematic" type grinding method and apparatus therefor, a novel "in process" "gagematic" type measuring means has been introduced so as to maintain the strong points of the former and develop a new grinding method and apparatus capable of securing high precision and fine surface finish of workpieces at the same time. For attaining the above purpose (a) a novel process of comparing the timing of signals of reaching the target final dimension and lapsing of the minimum required "sparkout" grind time and (b) a compensation process for wear of the dresser point are introduced.

Abstract: An automatic quality control system for a machine which measures workpieces processed by the machine. An estimated value to be obtained from an unprocessed workpiece depending upon information obtained from previously processed workpieces is calculated and is compared with a predetermined control limit. An instruction signal is generated when the estimated value is beyond the control limit to indicate a need for adjustment of the machine.