Abstract: A transferring apparatus for a transfer press machine which includes a plurality of working stations disposed in a work-transferring direction and provided with lower dies and upper dies cooperating to press workpieces, so that the workpieces are sequentially transferred between the working stations. A plurality of sets of pairs of left and right carriages are associated with one of the working stations. The spacings between adjacent twos of the sets of the carriages are adjusted in said transferring direction during operation. At least one cross bar is mounted to extend between the left and right carriages of each set and has suction cups mounted on an intermediate portion thereof for holding the workpiece. The cross bar is cyclically movable in the transferring direction and in a vertical direction. A pair of left and right guide bars vertically movably are mounted to extend along opposite sides of the working stations to provide the cyclic motion of the cross bar.

Abstract: A path for retreating movement of a cross bar from a standby position between a drawing mold and a mold of the next step to the drawing mold for holding the workpiece drawn by the drawing mold and a path for advancing movement of the cross bar holding the workpiece to the mold of the next step are formed into an upwardly smoothly curved line, and raising of a blank holder for the drawing mold is stopped temporarily for a period until the workpiece is discharged from the drawing mold by the cross bar. The paths for movement of the cross bar includes no suddenly turning portion and hence, any vibration of the cross bar due to an inertia force is prevented. Even if the paths for movement of the cross bar associated with all the molds are established in the same form, it is avoided that the cross bar or the workpiece interferes with the blank holder in the drawing mold.

Abstract: A method for producing a wheel rim of an automotive vehicle comprising the steps of supporting a cylindrical body on a vertical axis between an upper punch attached to an upper mold and a lower punch attached to a lower mold; fitting a side die to an outer peripheral surface of the cylindrical body, with the cylindrical body supported; then lowering the upper punch together with the upper mold to insert the upper punch into an upper portion of the cylindrical body and to form the upper end portion of the cylindrical body into the flange portion by press forming between the upper punch and the side die; thereafter releasing the cylindrical body from the supported state at its lower end surface; and further lowering the upper punch together with the side die and the cylindrical body to insert the lower punch into a lower portion of the cylindrical body and to form the lower end portion of the cylindrical body into the flange portion by press forming between the lower punch and the side die, whereby the working

Abstract: A press machine includes at least one mobile bolster movable with respect to the press machine, a plurality of die assemblies mounted on the mobile bolster and arranged in a row at equal intervals, a plurality of handling bars for transferring a plurality of workpieces successively through the die assemblies, one or more workpiece holders detachably mounted on each of the handling bars for holding the workpieces, feed bars for moving the handling bars, lifting/lower units for vertically moving the feed bars, and handling bar gripping devices for gripping the handling bars. A method of changing the workpiece holders comprises the steps of gripping the handling bars with the handling bar gripping devices, releasing the feed bars from the handling bars, elevating the feed bars beyond the die assemblies with the lifting/lowering units, moving the mobile bolster out of the press machine, and detaching the workpiece holders from the handling bars and replacing the workpiece holders with new workpiece holders.

Abstract: In a system for removing press-formed parts formed in a pressing machine, a loading transfer device is disposed between an ejection position to which a plurality of press-formed parts are simultaneously ejected in parallel from the pressing machine and a loading position established to load the press-formed parts onto each of a plurality of carrier pallets which are on standby in parallel to individually correspond to the plurality of press-formed parts. The loading transfer device comprises a plurality of transfer pallets connected to one another with variable spacings therebetween and reciprocally movable in parallel between the ejection position and the loading position so that the plurality of press-formed parts may be placed onto the individual transfer pallets, and a spacing-varying drive device for varying the spacing between the transfer pallets. During transferring of the press-formed parts by the loading transfer device, the spacing between the press-formed parts is varied.

Abstract: A press machine includes at least one mobile bolster movable with respect to the press machine, a plurality of die assemblies mounted on the mobile bolster and arranged in a row, a plurality of handling bars disposed in retracted positions between the die assemblies and movable, when one pressing cycle is completed, for gripping and transferring a plurality of workpieces successively through the die assemblies, and a plurality of handling bar gripping devices disposed in the retracted positions closely to the opposite sides of the side assemblies.

Abstract: A workpiece transfer device in a press machine simultaneously transfers workpieces from die assembly to die assembly for each pressing cycle. The workpiece transfer device includes two vertically movable bars extending along a direction in which the workpieces are transferred through the press machine, the movable bars being vertically movable by a lifting/lowering mechanism, two feed bars mounted respectively on the vertically movable bars and axially movable by a moving mechanism, and a plurality of handling bars detachably mounted on the feed bars and each having a plurality of workpiece holders for holding the workpieces.

Abstract: A transfer system for moving workpieces between a plurality of processing stations in sequential order. A pair of guide rails extend in a workpiece transferring direction on opposed sides of the stations and are movable up and down by a driving mechanism. A plurality of arm carriages are movable along the guide rails and are joined to one another by longitudinally extending connecting bars. A plurality of handling arms extend laterally between opposed pairs of the carriages. All of the arm carriages are moved as a group by a carriage driving mechanism. Auxiliary guide rails can be fixed to the carriages extending in parallel with the main guide rails. The handling arms can be movable longitudinally along the auxiliary guide rails. Rack and pinion mechanisms can be mounted on the arm carriages and the handling arms and interconnected with each other so as to drive each pair of arms in opposite directions.

Abstract: A conveyor in a plastic working machine, wherein lower dies and upper dies for plastic working of a work in collaboration are disposed on a plurality of working stations, respectively, the stations being set at intervals along the direction in which the work is conveyed, arms each having a handling mechanism for holding the work are provided on transfer bars disposed sideway of the working stations for conveying the work in sequence among the working stations, the transfer bars are provided on both sides of each working station, the arms are bridged between both the transfer bars with both the ends borne on both the transfer bars movably back and forth in the conveying direction or fixed to both the transfer bars.

Abstract: A conveyor in a plastic working machine, wherein lower dies and upper dies for plastic working of a work in collaboration are disposed on a plurality of working stations, respectively, the stations being set at intervals along the direction in which the work is conveyed, arms each having a handling mechanism for holding the work are provided on transfer bars disposed sideway of the working stations for conveying the work in sequence among the working stations, the transfer bars are provided on both sides of each working station, the arms are bridged between both the transfer bars with both the ends borne on both the transfer bars movably back and forth in the conveying direction or fixed to both the transfer bars.

Abstract: A method for preparing a sliding face of a machine tool, comprising the steps of: providing a flat surface as a slide surface to a slide component of a machine proper by gluing a plastic material prepared from a kneaded mixture of sintered metal powder and a synthetic resin binder to the slide component; and thermally dissolving out said synthetic resin binder contained in the plastic material and sintering said metal powder.

Abstract: A conveyor in a plastic working machine, wherein lower dies and upper dies for plastic working of a work in collaboration are disposed on a plurality of working stations, respectively, the stations being set at intervals along the direction in which the work is conveyed, arms each having a handling mechanism for holding the work are provided on transfer bars disposed sideway of the working stations for conveying the work in sequence among the working stations, the transfer bars are provided on both sides of each working station, the arms are bridged between both the transfer bars with both the ends borne on both the transfer bars movably back and forth in the conveying direction or fixed to both the transfer bars.

Abstract: A press of improved moldability and operation efficiency, including an upper movable die having a concave bottom surface, a lower, stationary arc having a convex top surface conforming to the concave bottom surface of the upper die, a blank holder arranged around the lower die for vertical sliding movement, and a blank support lever arm pivotally mounted on top of the blank holder. The blank holder is normally held raised by cushion means in such a position that its top surface is lower than the crest of the convex top surface of the lower die. The blank support lever arm is normally biased to a horizontal position to support a blank in a horizontal position in co-operation with the crest of the lower die and is tilted down by the upper die in downstroke movement out of its path, allowing the blank to be pressed down.