Abstract: An apparatus for detecting the length of web wound on a bobbin. The apparatus detects the amount of rotation of the bobbin and the amount of feed of the web and detects the amount of roll by an operation on the basis of the detected amounts. The amount of rotation of the bobbin is detected by the pulses generated in response to the rotation of the bobbin and counted by a first counter. The amount of feed of the web is detected by the pulses generated in response to the feeding of the web and counted by a second counter. The amount of roll is calculated by an operation device on the basis of the count values of the first and second counters.

Abstract: An electrophotographic copying apparatus includes original supporting device for supporting thereon an original to be copied, illuminating device for illuminating the original, an electrophotographic photosensitive medium movable through a charging station, a developing station and an image transfer station, the photosensitive medium having an image bearing area and a non-image bearing area set thereon, the non-image bearing area being set on the side edge portion of the photosensitive medium, charging device for charging both of the two areas of the photosensitive medium at the charging station, a projection optical system for projecting the optical image of the original upon the image bearing area of the photosensitive medium between the charging station and the developing station to form an electrostatic latent image, developing device for developing the electrostatic latent image into a visible image, image transfer device for transferring the visible image from the photosensitive medium to a transfer med

Abstract: A cleaning device for an image forming apparatus, wherein a magnetic developer image formed on the surface of an endlessly moving image bearing member is transferred onto an image transfer member, which comprises: a cleaning device to remove the magnetic developer remaining on the surface of the image bearing member; a magnetic field forming source situated in the vicinity of the cleaning device to confine the magnetic developer; a magnetic developer absorbing device having a surface to lead the confined magnetic developer from the surface of the image bearing member to a position away from it; a separating and guiding device which separates the magnetic developer from the magnetic developer adsorbing device, and guides the same outside the confining magnetic field; and a developer conveying device which conveys the removed toner in the direction substantially orthogonal to the moving direction of the image bearing member at a position where the confining magnetic field does not extend substantially.

Abstract: An auxiliary exposure device for use in an electrophotographic apparatus is utilized for eliminating unnecessary electrostatic charge from the end portions of the photosensitive member and includes a light reflecting member and light source for auxiliary exposure, wherein the light reflecting member is positioned to maintain the light source and the plane of the original in mutually conjugate relationship, and/or the end portion of the light reflecting member is shaped to match the form of the light beam reflected from the original.

Abstract: A device for supporting and fixing at a predetermined position an optical member such as a lens barrel supporting therewithin a lens or a mirror which takes part in projecting the image of an original to be copied upon a photosensitive medium. The device has a plate member formed with a supporting surface for supporting the optical member by press cutting and an element for pressing the optical member against said supporting surface of the plate member.

Abstract: A lens is fixed in a molded lens tube by a molded fastening ring. The fastening ring has a projection and the lens tube has a notch. The projection is elastically engaged in the notch so that the fastening ring is secured to the lens tube.

Abstract: A photoguide member having a first end face opposed to the path followed by a moving body and a second end face through which the light having entered through said first end face exits is disposed along the path of the moving body. The photoguide member is formed of a light transmitting material and has a recess formed in the second end face thereof. Light projected on the moving body enters the photoguide member through its first end face and passes through the photoguide member, whereafter the light travels to photodetector disposed in opposed relationship with the recess in the second end face. The body is detected in accordance with the presence of the light passing to the photodetector. The gap between the photoreception surface of the photodetector and the recess may be filled with a light transmitting material.

Abstract: A device for detecting the presence of a moving object, especially in a rotary camera, copier or printer, comprises transport rolls for the object. A pair of reflector members are disposed in opposed relationship so as to define an object transport passage therebetween. The opposed surfaces of the reflector members provide light reflecting surfaces. A light source and a non-transparent member are disposed at or adjacent one end of the reflector members for emitting light into the gap between the reflector members, and a light receiving element is disposed at or adjacent the other end of the reflector members for receiving a light beam passed thereto under repetitive reflections between the reflector members. The non-transparent member prevents the light from the light source from directly reaching the light receiving element. The light reflected between the reflector members may be intercepted by an object transported therebetween, thus detecting the presence of the moving object.