Abstract: A gas oscillator consisting of a plurality of laser tubes with discharge electrodes arranged in a straight line so that the cathodes are next to each other, a gas drive, a heat exchanger to cool a laser gas and an exhaust device provided to expel the laser gas from the laser tubes and containing an injection device for non-ionized gas to separate and expel the ionized gas from the laser tubes so as to suppress electrical discharges between the cathodes of the laser oscillator.

Abstract: An optical system for a folded cavity laser has a partially transmitting output mirror and a fully reflective folding mirror on one side of an active laser medium, and another folding mirror on the other side of the active laser medium disposed so that a resonating laser beam inside the resonator cavity may make multiple passes to obtain a long effective cavity length. Means are provided for adjusting at least one of the folding mirrors so that the laser beam resonates within the cavity. Means are also provided for adjusting the output mirror so that misalignments of the folding mirrors are compensated.

Abstract: A method and apparatus for controlling the cutting of bandsaw machines includes continuous feeding of the bandsaw blade relative to the workpiece by alternating the speed at which the bandsaw blade is fed relative to the workpiece between fast and slow, so that the bandsaw blade is continuously periodically fed relative to the workpiece alternately fast and slow. In a first embodiment, the bandsaw blade is fed into the workpiece and a continuously operating control motor is used to control a flow valve to alternate the speed at which the bandsaw blade is fed into the workpiece. In a second embodiment, the workpiece is fed into the bandsaw blade and a continuously operating control motor is used to control a flow control valve to alternate the speed at which the workpiece is fed into the bandsaw blade.

Abstract: A method of controlling a cutting machine to cut workpieces according to the machinability of the workpieces includes the steps of providing a plurality of predetermined constant voltage outputs, each constant voltage output corresponding to a predetermined cutting speed for the cutting machine, selecting one of a plurality of constant voltage outputs in response to a desired workpiece material to be cut by the machine, and driving the cutting tool at a predetermined cutting speed corresponding to the desired material to be cut in response to the selected constant voltage output.

Abstract: A tapping machine has a plurality of punches for punching a plate-shaped workpiece and extruding or plunging the punched holes and a plurality of tapping units for carrying out the tapping operation continuously in the tapping machine. A free positional workpiece transfer-and-position device is provided which moves the plate-shaped workpiece in the longitudinal and transverse directions of the work area of the machine. The plurality of punches are provided in the direction transverse to the longitudinal direction of the machine. First operating means provide an operating force for the tapping units and second operating means provide an operating force for the punches.

Abstract: The up and down movement of the tool electrode of an electrical discharge machine is controlled by a circuit arrangement including an electrical discharge condition judgment circuit monitoring the electrical discharge between a tool electrode and a workpiece from the waveform of the discharge and outputting a pulse signal in the event the discharge is abnormal, a motion command circuit which receives and counts the judgment circuit output signal and generates a command signal when the count reaches a set value, and an electrode control circuit responsive to the command signal and causing the tool electrode to move up and down.

Abstract: In order to facilitate the initiation of plasma discharge inside a gaseous discharge tube, some form of pre-ionizing the gas is required. This invention describes a technique whereby a small but intense discharge region is created near the cathode of a d.c. discharge in order to generate the necessary electrons to initiate the formation of the main electrical discharge. It makes use of the high negative voltage that is applied on the discharge cathode with respect to the discharge anode. A third auxiliary pin electrode near the cathode is introduced into the discharge tube. It is connected on the outside to the anode through a resistor of a suitable value. In the presence of a high voltage across the main electrodes, corona discharge occurs near the auxiliary electrode. This leads to the formation of a small region of intense discharge between it and the cathode. The electron generated in this small discharge region would drift towards the anode under the high electric field between the main electrodes.

Abstract: The present invention relates to a multiple processing machine having a punch press for punching a sheet-like workpiece and a ram-operated forming press for performing a variety of forming operations such as bending, shearing, and drawing on the workpiece. The punch press and forming press are interconnected with each other along a central partition. A feeding device is also provided adjacent the punching and forming press on a central worktable. In addition, a tool changing device is provided to change the tools in either or both of the punching and forming presses.

Abstract: The present invention relates to a device for replacing upper and lower dies in a bending processing machine, such as, for example a press brake. According to the invention, long upper and lower dies used in a bending processing machine are comprised of freely dividable sections that can be taken apart and recombined for convenient storage in an adjacent die exchange device. In the die exchange device, die holders are formed on the insides of a number of link members which are pivotably linked in a loop.

Abstract: A shearing machine is so arranged that the ram, when vertically moved, is resiliently guided by spring guides and is driven in such a manner as to be kept urged into contact with the guides. The shearing machine is provided with hold-down clamps which can firmly hold the work-sheet being sheared without damaging the work-sheet. A hydraulic pump for the the hold-down clamps is provided with a large diameter piston which will supply a large amount of flow under low pressure and damp the surge and a small diameter piston which will supply a small amount of flow under high pressure. The shearing machine is also provided with hold-up supports which will hold up the work-sheet being sheared to prevent the work-sheet from bending and curling. The shearing machine also has with a back gauge which can be used to set the widths or lengths into which the work-sheet is to be sheared but can be moved out of the way.

Abstract: A mirror adjustment device in a laser oscillator has a mirror holder which is mounted for free rotation about the X and Y axes of the laser. Pivot means are supported on the mirror holder bracket and about the mirror holder and drive means are connected with the pivot means to selectively rotate the mirror holder to adjust the mirror. Injection holes are also provided in the mirror holder whereby fresh laser gas may be injected in the direction of the mirror to clean and cool the mirror.

Abstract: A holder for the rear mirror of a laser generator has a pressure balance orifice formed in the block supporting the rear mirror in the mirror mounting member. The orifice equalizes the pressure between the chamber through which the laser passes and a chamber formed by the support block and the rear mirror. An additional pressure balance orifice is formed in the support block between a chamber formed by a power monitor supported in the support block and the chamber formed by the rear mirror in the support block, thus equalizing the pressure between these chambers. Another pressure balance orifice is formed in an addditional block supporting a total reflection mirror in the mirror mounting member, between the laser chamber and a chamber formed by the total reflection mirror in the block. Pressure is thus equalized between these two chambers.

Abstract: The invention relates to a shearing machine comprising of upper and lower blades with a non-contact detection means for measuring the thickness of a work piece. The machine also has a control means for adjusting the clearance between the upper and lower blades of the shearing machine to a value matching the plate thickness.

Abstract: The feed bars of a transfer press are reciprocated in the longitudinal and the transverse directions and a cam device synchronously links the longitudinal and transverse reciprocation. The cam device includes a conjugate cam which is built up from a plurality of layered cams.

Abstract: A nozzle lifting apparatus for a wire cutting electric discharge machine consisting of a nozzle for supplying a processing liquid or dielectric fluid to the electric discharge section of a workpiece, the nozzle being provided on the lower section of an elevating rod vertically movably supported by an upper arm; a slide member provided vertically movably on the inside of a guide frame integrally provided on the elevating rod; and an elevating activation rod supported on the upper arm for vertically activating the elevating rod through the slide member and interlockingly linked to the slide member. A concave section formed in the guide frame of the nozzle lifting apparatus is provided with a shock absorbing member. The slide is also located in the concave section.

Abstract: A band saw machine is provided with a fixed and movable blade guide arm which are set apart by a distance which is proportional to the width of workpiece to be cut. A detector mounted on one of the guide arms senses the lateral deviation of the saw blade during cutting and a control circuit outputs a termination signal to shut down the machine when the deviation is larger than a desired maximum value. When a workpiece of a different width is to be cut the guide arms are reset apart by a distance proportional to the width of the new workpiece and a detector is provided which senses the change of distance between the guide arms and outputs a signal to a revising circuit. The revising circuit then revises the maximum value of deviation to be allowed based on the change of distance between the guide arms.

Abstract: A process and apparatus for controlling an electric discharge machine consisting of applying a pulse voltage across a working gap when the predetermined time of interruption of the electric discharge has lapsed and when the interpolar voltage has exceeded a reference voltage, increasing the reference voltage and lengthening the time of interruption of the electric discharge when the rate of abnormal discharge occurrence becomes greater than an allowable rate and decreasing the reference voltage and reducing the time of interruption of the electric discharge when the rate of abnormal electric discharge occurrence is less than an allowable rate.

Abstract: A vertical, hydraulic bending press has a ram which is connected with the hydraulic cylinder so that an even and uniform sectional modulus is applied over the full length of the ram to decrease stress concentration of the ram during bending of the workpiece. The press frame includes means for guiding the ram. Additionally, a load detection device is provided on either side of the ram so that the ram may be stopped when misloading of the ram is detected.

Abstract: Adjustment of the rear or output mirror of a laser oscillator is performed by pivoting a laser mirror holder about three pivot points connecting the laser mirror holder and a support bracket. The first and third pivot points form an X-axis about which the holder may be rotated and the second and third pivot points form a Y-axis about which the holder may be rotated. The first and second pivot points are mounted so as to displace the holder in a direction parallel to the central longitudinal axis of the holder. Two control motors are disposed with their actuating shafts transverse to the central longitudinal of the laser mirror holder, at opposite sides of the side surface of the holder and act against the first and second pivot points to adjust the angular alignment of the laser mirrors.

Abstract: A press comprises a bed affixed to a frame, a slide vertically movably provided above the bed, a lower cushion mounted to the underside of the bed and having chambers, an upper cushion mounted to the slide and having chambers, a pneumatic hydraulic control circuit for a pressure source of each of the cushions, and a control for controlling individually the pressure within the chambers, wherein a complicated workpiece can be formed in one stroke of the slide.