Abstract: The heatsensitive stencil sheet perforating device of this invention includes a pedestal for an original mounted thereon; a pressing body attached pivotaly on one end of the pedestal for supporting a heatsensitive stencil sheet on an area corresponding to the original mounted on the pedestal; a light irradiation device attached detachably to the pressing body in a defined state, including a light source for irradiating the heatsensitive stencil sheet; a power supply device installed inside of the pressing body, for supplying electric energy to emit light from the light source; a first contact member attached to the light irradiation device, connected to the light source; a second contact member attached to the pressing member, connected to the power source of the power supply device, so as to come into contact with the first contact member when the light irradiation device is engaged in the pressing body in a defined state; and a support member attached to the pressing body, for supporting the light irradiati

Abstract: A document exposure apparatus includes a glass plate on which a document original is located, a press cover for covering the glass plate, an open/close discriminating unit for discriminating an open state and a close state of the press cover, an exposure unit, disposed under the glass plate, for illuminating the original with light, and a control unit for controlling the illuminating operation of the exposure unit according to an open/close state of the press cover, which is discriminated by the open/close discriminating unit.

Abstract: An image forming apparatus has two exposure control modes, automatic and manual, and a controlling section to switch the mode from one to another. When the exposure control mode is switched from automatic to manual, the medium value of the exposing degree range, from which the user may choose, is controlled to be equal to the exposing degree determined in automatic mode. However, if the exposing degree was not determined when in automatic mode, or if its change of the original is detected, e.g., in case of job interruption, a predetermined value is fixed to be the median of the exposing degree range.

Abstract: A flash lamp type device for illuminating an original document insures safety operation by alerting an operator, by an alarm, display and others, to the breakage of a glass platen and/or the open position of a protective cover which may occur while the voltage charge in a capacitor is higher than any desired voltage. A trigger circuit associated with a trigger wire is disenabled by sensing the breakage of a glass platen and/or the open position of the protective cover.

Abstract: A latent contact photographic copy of an original image is formed by apparatus comprising a translucent platen for supporting on one side thereof an assembly including an original image to be copied and an unexposed photographic film overlying the original image. Parallel connected lamps mounted on the opposite side of the platen are provided for irradiating the photographic film through the platen and original image. A cover is movable between an open position in which it uncovers the platen for receiving the assembly and a closed position in which it covers the platen and assembly. A circuit connected to the lamps includes a switch for selectively enabling the circuit to activate the lamps. The switch is mounted for contact with the cover when the cover is in the closed position. The switch is thus closed to effect exposure of the photographic film in response to pressure exerted on the cover when the cover is in the closed position.

Abstract: An original document presser includes a pressing member for pressing an original document on an original carriage, a driver for driving the pressing member for its opening and closing, a detector for detecting that the pressing member is in a predetermined position, and a control unit for controlling the motion of the pressing member. The control unit has a first signal generator and a second signal generator. In response to the start of an image forming operation, the first generator generates a signal to make the driver close the pressing member, and in response to the end of the image forming operation, the second generator generates a signal to make the driver open the pressing member. The control unit controls also the operation of the driver at the start of an image forming operation by means of an output signal from the detector.

Abstract: A device which may be operated in a mode of thermally perforating thermal stencils, and another mode of producing printed copies by employing the perforated thermal stencils, wherein the thermal stencils are provided as a particular type of framed assembly for employing a relatively viscous printing ink, the device having a base plate, a cushion plate, and a press plate pivotally mounted to the base plate and having an aperture covered with a transparent rigid plate and a light source unit mounted at the aperture for emitting flash light to the aperture.

Abstract: An exposure indicator which is attachable to a hinged glass mask cover frame, the indicator comprising a light emitting diode having one end lead connected in series through a light sensitive cell; a sensitivity-controlling resistance and switch to the appropriate pole of a source of electrical potential, such as a battery, the other pole of the battery being connected to the other end lead of the diode; the switch being arranged so that it is closed when the glass mask frame is closed against the blanket frame on which there is loaded a light-sensitive printing plate, and onto which an activating light is adapted to be directed, whereupon the light-sensitive photo cell is activated (resistance decreased) so that current is allowed to flow from the battery, through the switch and the light-activated silicon controlled rectifier, causing the diode to glow, thus indicating that the material has been exposed, and thereby preventing a second exposure due to the inattentiveness or forgetfulness of the operator.

Abstract: An exposure system for a microfiche duplicating machine includes a mercury vapor light source and a light transparent platen disposed above the light source for supporting an original microfiche card and a duplicating film card for exposure by the light source. A shutter mechanism is interposed between the light source and the transparent platen to control the exposure of the duplicating film card, and a cover is disposed over the transparent platen to prevent the escape of light from the duplicating machine during the exposure. A mechanical linkage is provided for automatically opening a pair of shutters within the shutter mechanism upon the closing of the cover to initiate the exposure of the duplicating film card. Simultaneously, a timer is energized by the closing of the cover to initiate an exposure timing sequence.