Abstract: A punching unit is arranged so that a plurality of punches is grouped into a first group having a predetermined number of punches and a second group containing any one of the punches in the first group and having a smaller number of punches. A punching state of the predetermined number of punches is produced by reciprocating a reciprocating member within a first range and by vertically moving the punches of the first group through the intermediary of cams and followers corresponding to the first group and another punching state of the smaller number of punches is reached by reciprocating the reciprocating member within a second movable range and vertically moving the punches of the second group through the intermediary of cams and followers corresponding to the second group. This arrangement allows the number of punches and dies to be reduced as compared to the prior art.

Abstract: A display device has a video circuit for pixels arranged in a matrix. The video circuit includes a digital data store section; a transfer-data processing section for generating a data signal at a time assigned to one of gray scale levels for the data in synchronism with a supplied clock; a gray-scale voltage generator for generating gray-scale voltages; a selection gate circuit for successively generating gate pulses associated with the gray-scale voltages, in synchronism with the clock; and a gray-scale voltage selector circuit for receiving the data signal via a selection-data transfer line provided for each of plural columns of the pixels, and for successively selecting the gray-scale voltages from the gray-scale voltage generator, in synchronism with the gate pulses. The gray-scale voltage selector circuit outputs as the video signal, one of the gray-scale voltages selected from the successively selected gray-scale voltages in synchronism with the data signal.

Abstract: A D/A conversion circuit with a small area is provided. In the D/A conversion circuit, according to a digital signal transmitted from address lines of an address decoder, one of four gradation voltage lines is selected. A circuit including two N-channel TFTs is connected in series to a circuit including two P-channel TFT, and a circuit including the circuits connected in series to each other is connected in parallel to each of the gradation voltage lines. Further, an arrangement of the circuit including the two N-channel TFTs and the circuit including the two P-channel TFTs is reversed for every gradation voltage line. By this, the crossings of wiring lines in the D/A conversion circuit becomes small and the area can be made small.

Abstract: A punch includes a base, a plurality of punch pins, a lever and a plank. The base includes a lower member defining a plurality of holes and an upper member defining a plurality of holes corresponding to the holes defined in the lower member. Each of the punch pins is for insertion through one of the holes defined in the upper member and one of the holes defined in the lower member. The lever is pivotally mounted on the base. The plank defines a plurality of holes. The plank is movably attached to the lever between several positions in each of which it pushes a different set of the punch pins when the lever is operated.

Abstract: A punch includes a base, a plurality of punch pins, a lever and a plank. The base includes a lower member defining a plurality of holes and an upper member defining a plurality of holes corresponding to the holes defined in the lower member. Each of the punch pins is for insertion through one of the holes defined in the upper member and one of the holes defined in the lower member. The lever is pivotally mounted on the base. The plank defines a plurality of holes. The plank is movably attached to the lever between several positions in each of which it pushes a different set of the punch pins when the lever is operated.

Abstract: A notching apparatus for notching both an outer lamination and an inner lamination from a single lamination blank at s single station using a single press device includes a multi-piece die assembly provides multiple outer slot punches, multiple inner slot punches, and a separator punch. The outer slot punch portion, inner slot punch portion, and separator punch portion of the multi-piece die assembly are all selectively positionable in respective punching positions and non-punching positions to facilitate a controlled notching operation.

Abstract: Punch machine 30 has a plurality of punches 52, 53 and dies 54, 61 for punching a hole out of a sheet, a driving means 35 for reciprocating in a direction intersecting with respect to the punch by the driving force of driving source 33, and cam mechanisms 44, 84, 94, 62, 69 for changing the motion of the driving means into the movement direction of the punch so as to transmit to the punch between the punch and the driving means. A plurality of punches are divided into first group and second group. The cam mechanism provided between each punch of the first group and the driving means moves each punch 52 by the motion operation of the driving means in a first direction, and the cam mechanism provided between each punch of the second group and the driving means moves each punch 53 by the motion operation of the driving means in a second direction. Different pattern of punching is respectively possible by the first and second groups of punches.

Abstract: An apparatus for putting on a thin strip a bar code consisting of a plurality of parallel thin and wide bars of respective thin and wide widths and a plurality of thin and wide spaces separating the bars has a plurality of stations spaced apart along a transport path extending in a transport direction and each having a respective group of tools of the relatively thin width, the tools of each station being immediately juxtaposed with one another in the direction. The strip is stepped in the direction along the path through the stations and only selected ones of the respective tools are selected and moved by actuators down into the strip. A controller is connected to the selector and actuator unit and to the transporter for forming each of the thin bars by pressing into the strip a one of the tools.

Abstract: A method and apparatus for press-cutting selected patterns in a workpiece. The apparatus includes a plurality of dies and at least one punch element associated with each die. A plurality of backing plates are provided to drive the punch elements against the workpiece when the backing plates are positioned in the operative position. A press-cutting pattern selector selectively positions the backing plates in the operative position or an inoperative position depending upon the pattern to be press-cut.

Abstract: A simplified punch press die assembly with a punch selecting mechanism, wherein vertically movable punches are each loaded with a downwardly biasing spring, and a punch selecting plate with escape holes in predetermined positions is mounted on the upper ends of the punches slidably in the direction perpendicular to the axis of the punches to select one of predetermined punching patterns with different combinations of punching holes.