Abstract: An apparatus for joining the trailing end of a preceding sheet to the leading end of a following sheet is disclosed which effects the union of the two sheet ends by keeping the trailing end of the preceding sheet sucked to the lower side of a pair of suction boxes disposed on a sheet path as separated by an interval, cutting the sheet so held in place along the interval, elevating a movable receiving table disposed below the sheet path, and holding in place the leading end of the following sheet, thereby bringing the leading end of the following sheet into contact with the cut end of the preceding strip of sheet and thereby allowing the two sheet ends to be joined.

Abstract: This invention concerns a process for producing a molded thermoplastic resin by interposing during molding a thermoplastic resin different from the thermoplastic resin to be molded as a skin layer between the die surface and the thermoplastic resin to be molded. A lubricant is provided to lubricate the interface between the die surface and the skin layer. After molding, the skin layer with lubricant is removed.

Abstract: A cleaning device for an electrophotographic copying machine collects residual toner from the photoconductive surface of a copying machine by using a rotary brush and deposits the collected toner in a specific part such as a filter via vacuum means, wherein it typically includes an air duct formed between a specific part and the rotary brush and a vacuum-activating fan mounted in a proper position inside the air duct.

Abstract: A sheet winding apparatus having stationary type touch roller is provided with means for moving a winding core between a sheet winding position and a sheet roll waiting position. Whenever a strip of sheet is wound in a roll of prescribed amount on the winding core, the finished sheet roll is moved to the sheet roll waiting position and, in the meantime, a new winding core is supplied and the sheet of the aforementioned finished sheet roll is cut at the trailing end and the newly formed leading end of the sheet is attached to the new winding core. The winding of the sheet on the new winding core is started as soon as the winding core supporting means returns to the winding position.

Abstract: A tough acrylic sheet having a smooth surface and a thickness of 1 to 10 mm, which is composed of methacrylate polymer having a weight average molecular weight of at least 1,000,000 and being biaxially oriented at an area stretch ratio of at least 3 and has a maximum orientation release stress of at least 20 kg/cm.sup.2. The acrylic sheet is prepared by a method wherein an acrylic resin blank having a surface area of at least 400 cm.sup.2 is heated at a temperature higher than the glass transition temperature of the resin but lower than the melting point of the resin so that the ratio of the viscosity of the resin in the surface layer portion to the viscosity of the resin in the core portion is smaller than 0.8; the heated resin blank is placed in a flat clamping mold heated to the temperature of the surface layer portion of the resin blank or a temperature close thereto, a high compressive force of at least 45 kg per cm.sup.

Abstract: Wrapping of a coiled strip of thin sheet of steel or other metal produced in a rolling mill is accomplished by placing under the coiled strip a wrapping paper of a suitable width cut to a length sufficient to encircle the outer periphery of the coiled strip, winding the leading half of the wrapping paper on a rolling core, fixing the tail end of the wrapping paper in position, rotating the aforementioned rolling core in the direction of unwinding the wound wrapping paper and at the same time, revolving the rolling core around the outer periphery of the coiled strip thereby winding the unwound wrapping paper on the coiled strip, thereafter superposing the leading end and the tail end of the wrapping paper one over the other and joining the overlapping ends fast to each other.

Abstract: An apparatus for winding a sheet into a roll by the center drive system, comprising a device for detecting a winding tension, a device for calculating the detected value by comparison with a desired tensile value conditioned by a dimension of the winding roll as based on a winding length growing with the progress of the winding, and a device for controlling the winding tension by the compared and calculated value. The tensile control adopts a theoretical equation in which the winding length is a variable and for which certain conditions are taken into consideration. The detected winding tension is compared with the preset appropriate tensile value, and is calculated in an analog or digital system so as to control a winding torque. The tensile control is accomplished by a torque actuator which is coupled to a winding axis.

Abstract: On the circular periphery of a winding shaft, flat recesses are formed at fixed intervals both in the axial and circumferential directions, with small rollers mounted one each on the flat recesses rollably on and inseparably from the flat recesses. A spool for winding a strip of sheet material thereon is slid over the circular periphery of the winding shaft sidewise from one end of the winding shaft. A slight rotation of the spool relative to the winding shaft causes the aforementioned rollers to be moved and wedged into the gap between the spool and the winding shaft, with the result that the spool and the winding shaft are locked to each other.

Abstract: A winder wherein, following completion of the winding operation, a roll receiver is moved from a standby position to a position under the completed sheet roll or rolls and the winding shaft used to wind the roll or rolls is then extracted to free the rolls for removal from the winder. Additionally, the winder is provided with a supply tension control for changing the tension in the web from that in the operation of unwinding the sheet from the web roll to a tension better suited for the winding operation, a winding torque adjuster which adjusts the winding torque by increasing the friction between the winding shaft and the winding core by regulating the air pressure within the hollow center of the winding shaft, and a winding core locking mechanism whereby the winding core is locked in place by spheres provided on the outer surface of a large number of core supporting collars fitted on the winding shaft.

Abstract: A self-propelling bevel fusion-cutting machine for beveling pipes comprises a machine main body which holds a fusion-cutter, such as a burner, for effecting the bevel fusion-cutting of the end face of a pipe, traveling guide rollers which roll on the pipe end face, and outer roller which rolls circumferentially on the outer peripheral surface of the pipe, and an inner roller which rolls circumferentially on the inner peripheral surface of the pipe. The machine main body is movable along the pipe end face by means of these rollers. The outer or inner roller is removably pressed against the peripheral surface of the pipe and this roller or the other roller is connected to a drive source mounted on the machine main body so as to be thereby driven for rotation.

Abstract: A self-propelling bevel fusion-cutting machine for beveling pipes has a machine main body which holds a fusion-cutter, such as a burner, for effecting the bevel fusion-cutting of the end face of a pipe, traveling guide rollers which roll on the pipe end face, and outer roller which rolls circumferentially on the outer peripheral surface of the pipe, and an inner roller which rolls circumferentially on the inner peripheral surface of the pipe. The machine main body is movable along the pipe end face by means of these rollers. The outer or inner roller is removably pressed against the peripheral surface of the pipe and this roller or the other roller is connected to a drive source mounted on the machine main body so as to be thereby driven for rotation. This rotatably driven roller has a substantial width and the diameter of its portion located nearer to the pipe end face is greater than that of its portion located remote therefrom.

Abstract: A multicolor rotogravure printing system comprising a train of as many monochromatic printing units as the number of the colors required, each printing unit comprising an upper structure including an impression roll and a lower structure including a plate cylinder. These upper and lower structures are adapted to connect and disconnect from each other, and the upper structures are fixed to and suspended from a main frame. Each lower structure has a moving means, thus making it easy to change a used lower structure for a fresh one, and at the same time to perform necessary adjustment of those parts of the printing unit which are made accessible by removal of the lower structure. Also, the length of idle time in printing operation is appreciably reduced.

Abstract: A method of winding a sheet into a roll by the center drive system, comprising the step of detecting a winding tension, the step of calculating the detected value by comparison with a desired tensile value conditioned by a dimension of the winding roll as based on a winding length growing with the progress of the winding, and the step of controlling the winding tension by the compared and calculated value. The tensile control adopts a theoretical equation in which the winding length is a variable and for which certain conditions are taken into consideration. The detected winding tension is compared with the preset appropriate tensile value, and is calculated in an analog or digital system so as to control a winding torque. The tensile control is accomplished by a torque actuator which is coupled to a winding axis.

Abstract: Molten synthetic resin material containing foaming agent in an amount of 0.05 to 5 percent by weight is injected into a pre-pressurized mold cavity in a mold which is closed by a relatively low clamping force having a coefficient in the range of 10 to 40, said coefficient being represented as a ratio of clamping force to maximum injection shot volume. The above injection step is carried out for at least 3 seconds. After the injection step has been initiated, the pre-pressurized mold is released to atmosphere during the injection step at the soonest. At least two molds may be used to be alternately charged with said material.

Abstract: Disclosed is a device for wrapping up the ends of a roll in a wrapping paper which has been wrapped to encircle the roll and which being longer than the roll extends cylindrically from both ends thereof, which device is characterized by having a plurality of tucking members disposed at given intervals on the outer peripheral surface of the wrapping paper extending from the ends of the roll and by having a plurality of projecting members disposed on the inner peripheral surface of the wrapping paper spaced to fall one between each adjacent pair of tucking members. By moving the plurality of tucking members toward the center of the roll and at the same time gradually drawing in the plurality of projecting members, the extended portion of wrapping paper is formed with alternate ridge portions and groove portions and is pressed onto the ends of the roll.

Abstract: A multi-layered article molded according to the present invention has in its cross-section a triple-layered structure consisting of two surface layers and a core layer interposed between said surface layers, said triple-layered structure being injection molded in a single shot from two kinds of thermoplastic synthetic resins to be formed into the surface and core layers, respectively, said core layer having a thickness less than one half of the entire thickness of said article.

Abstract: In a sheet winder for winding sheet material into rolls while holding the sheet roll in contact with a touch roller, the contact pressure between the sheet roll and the touch roll is maintained constantly at the optimum magnitude by a method which comprises determining the uncompensated contact pressure owing to the weight of the sheet roll and the rocking arm on which the sheet roll is supported, comparing the uncompensated contact pressure with an optimum contact pressure predetermined on the basis of various properties of the material of the sheet being wound and adjusting the actual contact pressure to the optimum contact pressure.

Abstract: A process for producing moldings comprises the steps of injecting a plastified synthetic resin into a mold cavity, thereafter or simultaneously injecting heated fluid having a viscosity of 0.01 - 100 poise into the same mold cavity to fill it with said fluid in such a manner that said heated fluid is surrounded by said synthetic resin within said mold cavity and releasing said fluid from said mold cavity after at least a portion of said synthetic resin has set. If the injected synthetic resin contains any foaming agent, a foamed article having its outer smooth skin can be obtained according to the present invention. If the injected synthetic resin contains no foaming agent, a hollow, smooth-surfaced article can be obtained.

Abstract: Foamable synthetic resin materials are plastified and injected into a mold cavity in an amount less than the volume of mold cavity and a body of gas under pressure is charged in the mold cavity in such manner that it is enclosed by said resin materials. When the injected resin materials sets at least at its outer surface layer, the gas is discharged out of the mold cavity so that the foamable resin materials can be expanded in the hollow portion formed by the pressure of the charged gas. Said foamable resin materials may be surrounded by unfoamable resin materials in the mold cavity.

Abstract: An apparatus for injection molding synthetic resin materials comprises means for injecting the material to be molded, mold means having a cavity for receiving the material from said injecting means, entrance passage means connecting said injecting means with the cavity of said mold means and valve means disposed in said entrance passage means for closing it to shut off the flow of material in said entrance passage means, said valve means having a fluid passage communicating at its one end with only the cavity of said mold means when said valve means is closed, said fluid passage having the opposite end thereof adapted to connect with another source of pressurized fluid.