Abstract: In a stencil printer, when a print drum reaches a stand-by position where a new master produced by a master making operation should have its leading edge clamped on the drum, a master discharging operation under way for discharging a used master is interrupted. After the leading edge of the new master has been clamped on the print drum, the master discharging operation is resumed while a master feeding operation for wrapping the new master around the print drum is under way. A printing operation for printing a document image on a sheet is effected simultaneously with the resumption of the master discharging operation. Such a procedure is implemented as a high speed 1 control mode and executed by a main control unit.

Abstract: A printing machine comprising a sheet feeding station for feeding sheets into a printing station and capable of being detachably attached into a sheet inlet, a sheet discharging station for discharging printed sheets from the printing station and positioned near a sheet outlet, and a cover disposed near at least the sheet inlet or the sheet outlet and shielding either the sheet inlet or sheet outlet except for at a sheet passing area thereof.

Abstract: In a stencil printer including a rotatable drum for wrapping a perforated stencil or master therearound, a pair o f inclined tension rollers are movable into and out of contact with the drum in order to smooth a creased master. The distance between the tension rollers sequentially increases from the upstream side toward the downstream side with respect to an intended direction of master transport. While the master is sequentially wrapped around the drum, the tension rollers pull the opposite side edges of the master outward. At the same time, the elastic member presses the intermediate portion of the master. The tension rollers and elastic member cooperate to smooth the master. The elastic member is located at a position not closer to the drum than a position around a line connecting the points of the tension rollers contacting the master, and where it can contact the intermediate portion of the master.

Abstract: A stencil printer of the present invention is selectively operable in a simplex print mode or a duplex print mode and includes two drums. The drums each has a respective master support on its circumferential surface. The master supports of the two drums are movable into and out of contact with each other without the distance between the shafts of the drums being changed. In the duplex print mode, the master supports contact each other with the intermediary of a paper so as to print images on both sides of the paper at the same time. The printer obviates noise and insures high image quality.

Abstract: A stencil printer of the present invention includes a print drum and a pressing member. After a cut stencil or master has been wrapped around the print drum, the pressing member presses a paper or similar recording medium against the master. As a result, ink fed to the print drum oozes out to the paper and prints a desired image thereon. When the pressing member presses the paper against the master, an electric field is formed between the pressing member and the print drum in the direction in which the ink migrates from the drum to the paper. The printer is capable of adjusting image density without varying a mechanical pressure to act on the drum or varying the print speed.

Abstract: A printer of the type wrapping a master around a print drum and pressing a sheet against the master with the print drum or a press drum is disclosed. A pulse encoder is mounted on the press drum for sensing changes in the rotation speed of the press drum, so that a timing for feeding the leading edge of the sheet toward a clamper can be controlled. The clamper is capable of surely clamping the leading edge of a sheet and preventing it from rolling up. The sheet can be fed stably and reliably and can therefore be brought into accurate registration.

Abstract: This invention is intended to prevent loosening of a stencil which is wound round a core 16B in the shape of a roll 16. The stencil roll 16 has at least one side surface 16t thereof applied with a paste 16a1. This is effective in preventing the stencil from becoming loose by an inertia force of the stencil roll 16 when it is unstable during its rotation. Thus, the stencil can be paid out from the stencil roll without becoming slack.

Abstract: A sheet feeding apparatus for image producing systems such a stencil duplicating machine, a printer, and a copying machine. The sheet feeding apparatus comprises a sheet feed roller, a sheet feeding pressure regulator, a pair of register rollers, a sheet feeding time detector, and a control unit. The control unit compares a sheet feeding time detected by the sheet feeding time detector with a predetermined reference sheet feeding time, and controls a sheet feeding pressure on the basis of a compared result during a sheet feeding operation.

Abstract: A stencil base sheet includes a thermoplastic resin film, with a surface of the stencil base sheet on the side of the thermoplastic resin film having a surface smoothness of at least 6000 seconds. From this stencil base sheet, a printing master is prepared by use of a heat-emitting resistor with the application of electric signals thereto with pulse modulation corresponding to image recording density, thereby forming perforations of a different size corresponding to recording image density in the stencil base sheet by thermal fusing. Furthermore, a monochrome or multi-color stencil printing is performed by using the printing master.

Abstract: A heat-sensitive stencil including a thermoplastic resin film, and a porous resin layer formed thereon. The porous resin layer contains fibers having an average length in the range of 30 .mu.m to 10 mm. The stencil is produced by applying a coating liquid over a surface of a thermoplastic resin film to form a coated layer, and drying the coated layer. The coating liquid has a viscosity of 80-250 cp at 25.degree. C. and contains a resin and fibers having an average length in the range of 30 .mu.m to 10 mm.

Abstract: A drum and an ink holding member for a stencil printer and capable of obviating offset effectively, and a stencil highly resistive to printing are disclosed. The ink holding member constitutes the outer periphery of the drum and allows the stencil or master to be wrapped therearound. The ink holding member is implemented as a sintered sheet of fibers. At least the surfaces of the fibers are constituted by metal.

Abstract: An inner bag is adhered by an adhesive to the substantially entire region of a pouring spout attaching panel of a carton blank, and to substantially half regions of panels bordering the pouring spout attaching panel, which are on the side of a pouring spout. The inner bag is adhered to the carton at a part which is remotest from the pouring spout and is normal to a direction of movement made by the inner bag when air is drawn. The inner bag is adhered to the carton blank at the substantially entire region of the pouring spout attached panel, and four corners on the side of the panel, which enables the inner bag to be set up into a square shaft with high precision upon the setting-up of the carton blank.

Abstract: A used stencil receptacle for facilitating the disposal of used stencils. The used stencil receptacle is in the shape of a box, and comprises a base, a pair of long straight sides, a short straight side, and an open side or a movable side which is freely opened and closed.

Abstract: In a thermal printer for feeding a direct thermal paper or a thermal transfer ribbon and a printing paper between a thermal head and a platen roller while such paper is pressed and held by pressing force of a pressure application means, and printing on such paper by heating a heating portion of the thermal head, the positioning or the thermal head relative to the platen roller in the paper feeding direction can be easily performed by a simple mechanism without using an exclusive assembling instrument.

Abstract: In an image forming apparatus, a large capacity paper feeder has a single pick-up roller capable of selectively feeding papers from an LCT (Large Capacity Table) or from a cassette removably mounted to the apparatus. The paper feeder, therefore, does not need a bulky paper feed unit for a cassette feed mode. In addition, a space for an LCT feed mode is not necessary above the pick-up roller, so that the height of the apparatus is not increased.

Abstract: An image producing apparatus including a control panel. When a school mode is selected, numeric or alphanumeric keys are pressed on a keypad so as to select one or a plurality of classes or grades. Numerical data concerning the number of students per class and grade are extracted, and are registered as the number of prints to be produced and sorted.

Abstract: A heat-sensitive stencil is disclosed which includes a porous substrate having opposing first and second surfaces, and a thermoplastic resin film bonded to the first surface of the substrate with an adhesive, wherein the second surface of the substrate is negative to a wax No. 6 pick test defined in the specification herein so that the fibers constituting the substrate are not picked off during its contact with a platen roller in the master forming stage.

Abstract: A used stencil receptacle for facilitating the disposal of used stencils. The used stencil receptacle is in the shape of a box, and comprises a base, a pair of long straight sides, a short straight side, and an open side or a movable side which is freely opened and closed.

Abstract: A drum, stencil and ink holding member for a stencil printer are disclosed. The stencil is made up of a porous substrate and a thermoplastic resin film. The side of the substrate contacting the film has a surface roughness of 5 .mu.m Rz to 45 .mu.m Rz, preferably 5 .mu.m Rz to 35 .mu.m Rz or more preferably 5 .mu.m Rz to 25 .mu.m Rz.

Abstract: A method of printing a document image on a paper by wrapping a stencil, or master, perforated by, for example, a thermal head around a print drum, and a stencil printer. A wedge effect occurs between the print drum and an ink roller disposed in the print drum. The wedge effect, coupled with the pressure of a pressing member, causes ink to exude from the inner periphery to the outer periphery of the print drum and further from the master to the paper. The paper is separated from the master at a position downstream, with respect to the direction of rotation of the print drum, of a portion where the ink exudes due to the wedge effect. At the paper separating position, the ink does not exude from the master, and the ink pressure does not act. This obviates the blur of a printed image and prevents the ink from being transferred from the front of an underlying printing sheet to the rear of an overlying printing sheet stacked on the underlying sheet due to excessive ink transfer.