Abstract: A table translation apparatus for a wood working machine is disclosed wherein a table can be repetitively moved at a high speed within a small distance to enhance the working efficiency for wood. A pair of front and rear screw shafts are supported for rotation linearly at front and rear portions of a bed extending forwardly and backwardly and driven to rotate forwardly or reversely independently of each other by a motor. A pair of front and rear shuttles are held in threaded engagement with the front and rear screw shafts, respectively. A pair of front and rear side clutches for releasably connecting the table and the front and rear side shuttles to each other, respectively, are provided on the table mounted for forward and backward sliding movement on the bed.

Abstract: An apparatus for providing a warning of the rotation of a spindle for a machine such as a wood working machine which gives a warning while a spindle continues to rotate due to inertia even after a motor driver for a spindle motor for rotating the spindle is interrupted thus enhancing the safety of operation of the machine. The apparatus comprises a warning device for warning that the spindle is rotating, a rotation detecting device for detecting rotation of the spindle and continuously generating, while the spindle is rotating, an electric signal independently of whether the motor driver is operative or inoperative, and a controller for discriminating between the presence and absence of an electric signal from the rotation detecting device and controlling the warning device in accordance with a result of the discrimination.

Abstract: A workpiece is placed on a plurality of supporting cylinders which are projected upwardly from an upper plate or a hollow table body. All of the supporting cylinders normally assume a lowered position at which lower end faces thereof contact seat portions in a chamber of the table body so that attracting pads provided at upper ends of the supporting cylinders are disconnected from the chambers. Accordingly, even if the chamber is put into a negative pressure condition, the workpiece is not attracted to the attracting pads. Then, compressed air is supplied to the pneumatic cylinders of those supporting cylinders which fall within a horizontal area of the workpiece to lift those supporting cylinders. Consequently, the lower end faces of those supporting cylinders are spaced away from the seat portions to allow communication between the attracting pads and the chamber by way of air sucking passageways formed in the supporting cylinders to suck air through the attracting pads.

Abstract: A power supply circuit for a magnetron adapted to supply microwave energy to an electrodeless discharge bulb is disclosed. The circuit includes a rectifier coupled across a commerical AC voltage source, a filter for smoothing the output of the rectifier, an inverter for converting the DC voltage supplied from the filter into a high frequency AC voltage, a step-up transformer for stepping up the high frequency AC voltage outputted from the inverter, and a rectifier which rectifies the high voltage AC output of the transformer into a unidirectional voltage which is supplied to the magnetron. The inverter switching is controlled by a pulse width modulation control circuit to maintain the magnetron output power at a predetermined level.

Abstract: A power supply circuit for a magnetron adapted to supply microwave energy to an electrodeless discharge bulb is disclosed. The circuit includes a rectifier coupled across a commercial AC voltage source, a filter for smoothing the output of the rectifier, an inverter for converting the DC voltage supplied from the filter into a high frequency AC voltage, a step-up transformer for stepping up the high frequency AC voltage outputted from the inverter, and a rectifier which rectifies the high voltage AC output of the transformer into a unidirectional voltage which is supplied to the magnetron. The inverter switching is controlled by a pulse width modulation control circuit to maintain the magnetron output power at a predetermined level.

Abstract: The invention relates to a machine tool on which an extra working head can be exchanged readily.

Abstract: A power supply circuit for a magnetron adapted to supply microwave energy to an electrodeless discharge bulb is disclosed. The circuit comprises a rectifier coupled across a commercial AC voltage source, a filter for smoothing the output of the rectifier, an inverter for converting the DC voltage supplied from the filter into a high frequency AC voltage, a step-up transformer for stepping up the high frequency AC voltage outputted from the inverter, and a rectifier which rectifies the high voltage AC output of the transformer into a unidirectional voltage which is supplied to the magnetron. The inverter switching is controlled by a pulse width modulation control circuit to maintain the magnetron output power at a predetermined level.

Abstract: A chip removing device for a multi-head machine tool which is reduced in cost, facilitates maintenance thereof and allows adjustment of the distance between adjacent working heads by a comparatively great amount. The device comprises a duct having a slit formed in a lower wall thereof, and an expansible shutter for normally closing the slit. A connecting pipe extends upwardly from each of the working heads, and upper end portions of the connecting pipes extend in an airtight condition through the shutter into the duct. When a working head is moved, the shutter is partially expanded and contracted following the working head to maintain the closed condition of the slit. A seal plate is secured horizontally within the duct and disposed commonly to the working heads.

Abstract: A table exchanging device for a wood working machine wherein workpieces of wood can be individually attracted and fixed by a sucking action by vacuum and such sucking action can be maintained also while the slide tables are slidably moved. The device comprises a pair of hollow slide tables having air sucking holes formed in upper walls thereof, a hollow bracket provided in a pneumatically communicating relationship on each slide table, and a hollow tubular shaft provided on each of a pair of left and right beds of the wood working machine and connected to a blower or a vacuum pump. A first hollow arm is supported for horizontal pivotal motion on each hollow bracket and pneumatically communicated with the follow bracket at their mutually connecting location. A second hollow arm is supported for horizontal pivotal motion on each hollow tubular shaft and pneumatically communicated with the hollow tubular shaft at their mutually connection location.

Abstract: An automatic processing head replacement device for a NC type wood working machine in which a rack is provided on one of beams, a carriage is mounted on rails another beam, a slide block is mounted on rails on the other beam, the carriage and slide block are connected together, a pinion on the carriage is driven by a motor and meshes the carriage, the plurality of head holders are arranged in side by side relationship for movement in unison with the carriage and slide block.

Abstract: An automatic polishing machine which can polish a curved skin of a large area fully automatically and efficiently along a three-dimensional plane of the skin. The machine comprises a fixed horizontal beam, a movable table movable in a horizontal direction perpendicular to the beam for receiving thereon a work to be polished, a carriage mounted for movement on the beam, a slider mounted for up and down movement on the carriage, a turning member mounted for forward and backward turning movement within a predetermined angular range on an arcuate rail which is located at a lower end portion of the slider and has an upwardly swollen arcuate configuration, a rocking member mounted for up and down rocking motion on the turning member, a spindle supported for rotation on the rocking member, and a buff removably mounted on the spindle.

Abstract: In a microwave discharge light source apparatus for effecting discharge of an electrodeless discharge lamp held in a cavity which causes resonance by microwaves, the wall surface of the cavity resonator is constituted by a mesh and wires constituting the mesh, are electrically connected at each crossing point without resistance of contact. Effective discharging of the lamp is attainable and the cavity has a mechanically strengthened structure.

Abstract: A meal vapor discharge lamp having an outer jacket, the inside wall of which is covered by a fluorescent layer comprising at least one red emitting phosphor whose emission peak is in a wavelength range of 610-630 nm and whose luminescence forms a line, said lamp containing an arc tube within the confines of said outer jacket which encloses zinc and/or cadmium in addition to mercury as the main luminous components.