Abstract: An image forming apparatus includes an image forming mechanism for forming an image and a matrix circuit having connected thereto a plurality of keys including an initiating key for instructing the start of image formation and a stop key for interrupting image formation. The image forming apparatus further includes a controller for controlling image formation by the image forming mechanism in accordance with a control sequence and a memory containing a program for sensing key input of the matrix circuit. Prior to the start of image formation, the controller executes the program for sensing key input of the matrix circuit and executes the control sequence in response to the sensing input of the initiating key. During image formation, the controller executes the program for sensing key input of the matrix circuit such that sensing whether the stop key has been input is executed without sensing whether the initiating key has been input.

Abstract: A document scanning apparatus includes a first scanner for reciprocating an optical member and for exposing an original document put on a document platen, and a second scanner for feeding an original document to an exposure position and for exposing the original document at the exposure position. A selector selects either the first scanner in a stationary exposure mode or the second scanner in a dynamic exposure mode. In the stationary exposure mode, a controller causes forward movement of the reciprocating optical member to stop and the reciprocating member to move backward in accordance with a detection signal signifying that the trailing edge of a recording sheet has passed a predetermined position in the transport path for the recording sheet. In the dynamic exposure mode, the controller controls the second scanner to feed successive original documents in accordance with the same detection signal for the trailing edge of the recording sheet.

Abstract: An image processing apparatus provided with a plurality of operation devices for recording or reproducing an image. Using operation control signals, a controller controls the operation devices in accordance with selected information signals. Appropriate ones of the information signals are selected in accordance with the control signals.

Abstract: An image forming apparatus capable of feeding or transporting recording medium of different sizes through the image forming path. A discriminating device determines whether or not a recording medium has reached a predetermined position in the transport path and a detecting member detects the recording medium a predetermined time thereafter to identify the size of the recording medium. If the recording medium is detected within the predetermined time, it is identified as being of a particular size. When the medium is detected during a time period different from the predetermined time period, the medium is identified as being of a size smaller than the particular size. The image formation operation is controlled as a function of the size identification of the recording medium.

Abstract: An image forming apparatus including image forming device, for forming an image on a recording member, having a scanner for scanning the recording member, an input device for selecting and instructing the function mode of the scanner, and a controller having a plurality of stored programs corresponding to the scanning modes for controlling the function of the image forming device, the controller being adapted to select a stored program in response to the input device and controlling the function of the image forming device in accordance with the program of the selected scanning mode.

Abstract: A spring clutch device includes a driving side clutch shell, a driven side clutch shell opposed to and coaxial with the driving side clutch shell, a clutch spring disposed in a tight manner over the two clutch shells, a stop member disposed coaxially with the clutch shells and engaged with one end of the clutch spring to control the action of the clutch spring, and a control member for acting on the stop member, there are formed projections on the circumference of the stop member, in an axially and circumferentially staggered relationship, and the control member is selectively displaceable to positions corresponding to the projections for engagement and disengagement with the projections, thereby controlling ON-OFF of the clutch.

Abstract: This specification discloses an original urging device for enabling an original to be well placed and supported on the original supporting carriage of a copying machine, a printing machine or the like. The supporting member for the original urging plate of the device has one end thereof pivotally supported. A point for taking the resilient force of a resilient member is provided at a point on the supporting member. During replacement of the original, the original urging plate may be made stationary within a predetermined range of angles facilitating the handling of the urging plate, in accordance with the rotated position of the supporting member and by the relationship between the moment produced by the gravity force acting to the supporting member and urging plate and the moment produced by the resilient force of the resilient member.