Abstract: A device for tight fixing a rotary body such as a gear and a pulley, to a rotary shaft such as a motor shaft and a transmitting shaft, provides a slippage between the rotary body and the rotary shaft when an over-load occurs to the rotary body. A groove portion is formed either at the inner surface of a mounting hole in the center of the rotary body or at the outer surface of the rotary shaft, in which a pair of key members having a tapered contact surface are arranged in the longitudinal direction of the rotary shaft. A clamping bolt going through one of key members is screwed into the other key member, and pressed to both key members. Due to the pressure from the clamping bolt, each key member is displaced outward as guided by the tapered surface. One of key members makes a contact with the inner surface of the mounting hole or rotary body, and at the same time, the other begins to press the outer surface of the rotary shaft, respectively.

Abstract: A reference plane moving device comprises an attachment section which is movable along a given reference plane, and a balancer which can operate in correspondence with this attachment section, the attachment section including an air intake hole section capable of creating a vacuum condition between the attachment section and the reference plane by sucking air, and compressed air ejecting hole sections capable of creating a high pressure condition between the attachment section and the reference plane by blowing compressed air against the reference plane. By virtue of a combined action of the vacuum and the high pressure conditions thus created, the attachment section can be kept away from the reference plane by a fixed distance while being attracted thereto. The attachment section with an appropriate attachment can be readily moved on the reference plane.

Abstract: A vacuum breaking device for an ejector pump is provided. The vacuum breaking device according to the present invention features that it is provided with a movable sealing valve for blocking the outlet port of the ejector hole of the pump when a vacuum generated in a system within the pump is be broken. The valve is arranged in opposite relationship with the ejector hole of the pump and shifts to block the outlet port due to the pressure of compressed air supplied to the air sucking chamber of the pump so that the leakage of the vacuum breaking compressed air from the ejector hole is prevented thereby increasing the efficiency of vacuum breaking operation. The vacuum breaking device is applicable to a vacuum sucking device for attracting and sucking an article so as to transfer it to a desired place.

Abstract: Workpieces are gripped by a pair of jaws having rear end parts contained within a housing. A single pinion borne within the housing meshes with racks formed on the rear end parts and the jaws are synchronized to operate in opposition to each other.

Abstract: A vacuum generating device for an ejector pump is provided. The vacuum generating device according to the present invention comprises an ejector pump mechanism having on one of the side surfaces thereof with an air intake port, air inlet port and exhaust port and attached with a fitting base including an air intake pipe, inlet pipe and exhaust pipe capable of connecting to the ports of the ejector pump mechanism, respectively. The device according to the present invention can be effectively used as one of the units of a vacuum generator assembly in a compact form in which the fitting bases of the units are arranged adjacent to one another with the inlet and exhaust pipes thereof held communicating with each other, respectively, whereby the number of pipes is minimized and the noise level from the assembly is reduced. The device or the assembly is applicable to a sucking device for attracting and sucking an article so as to transfer it to a required place.

Abstract: A pressure switch wherein electrode plates are provided on both sides of a pressure conductive rubber plate. The pressure switch is interposed between a body and a receiving block slidably fitted to the body so that both electrodes may be connected with each other by connecting the rubber plate into conductive state to obtain an electric signal across the electrodes. The pressure applied to the rubber plate is regulated by a variable spring.

Abstract: A solenoid on-off valve for opening or closing a flow channel passing through a valve chamber by alternately moving a plunger in the valve chamber with a solenoid and a return spring, comprises valve seats on both ends of the valve chamber, a valve head 12 for closing valve seats is disposed at one end, while a path 14 for communicating the valve hole of the valve seat with the valve chamber is disposed at the other end of the plunger and the flow channel is adapted so as to be normally open or normally closed by the mounting of the plunger in the valve chamber while turning the direction depending on the case.

Abstract: A vacuum valve-sensor device mounted on a vacuum source and maintaining the vacuum generated by the vacuum source to a required level. It includes a one-way valve which allows gas to flow towards the vacuum source but not away therefrom, and a pressure sensor on the side of the one-way valve remote from the vacuum source. The one-way valve includes a valve seat through which flow of gas is directed and a valve element biased toward seating on the valve seat from the side of the vacuum source. The pressure sensor may be located on the side of the valve seat remote from the valve element thereof, and may include a V-ring seal member fitted on the valve element.

Abstract: Herein disclosed is an ejector pump which can be used favorably with a sucking disk for carrying an article. In the bore of a pump body, there are fitted a nozzle block having a nozzle hole and an ejector block which has an ejector hole aligned with the nozzle hole of the nozzle block, so that a suction chamber formed between the nozzle hole and the ejector hole may communicate with a suction port which is formed in one side of the pump body. Fitted in the pump body, too, is a spool valve for opening or closing a communication passage providing communication between the nozzle hole and the compressed air inlet port of the pump body. The spool valve is controlled by an electromagnetic change-over valve disposed outside of the pump body. The pump has the advantage that the compressed air can be supplied at a high flow rate to establish a strong sucking force even with a relatively small-sized electromagnetic change-over valve.

Abstract: An air assisted sliding device has a pallet supported on a base. The pallet has a recess provided on the periphery of its bottom surface in which a flexible tubular sealing member is mounted. The sealing member has a memory normally contracting it so as to be flat. An air passage communicates with the interior of the flexible sealing member so that compressed air can be fed to it. A groove is evenly provided on the bottom surface of the pallet within the bounds of the recess and a separate air passage for feeding compressed air or vacuum air is communicated with the groove so that the pallet may be provided with an air film of compressed air or may be stopped and a vacuum applied to attract the pallet to the base at a predetermined position on the base. A timing belt drive or an electromagnetic motor is used.

Abstract: A center chuck assembly for rotatably supporting the end of a cylindrical workpiece comprises a shaft rotatable in a mounting pipe to be mounted on a receiving member and having an operating flange and a disc formed on the outer end thereof. The disc has a spiral groove on the end surface thereof. A chuck holding member having chuck members slidably fitted within holes formed radially in the chuck holding member, is rotatably fitted on the disc of the rotating shaft. The chuck members have teeth on one side thereof, and these teeth engage with the spiral groove on end surface of the disc. By rotating the operation flange relative to the chuck holding member, the chuck members are caused to project outwardly by means of engagement of said teeth and spiral groove and to abut the inside surface of the workpiece at a position spaced from the end of the workpiece, thereby supporting the workpiece securely. By using this center chuck assembly, end surface of the workpiece can be machined easily in one process.

Abstract: A fluid feeding valve, having a valve chamber with a valve member contained movably therein, the valve member being actuated by the pressure difference between fluid receiving port and fluid feeding port to close and open said ports alternately. The fluid feeding valve body also comprises a fluid reservoir communicating with said fluid receiving and feeding ports.When the fluid receiving port receives the pressurized fluid, the valve member closes the fluid feeding port and the pressurized fluid is stored in the fluid reservoir through the valve chamber, and when the fluid receiving port stops the receiving of fluid, the valve member closes the fluid receiving port and opens the fluid feeding port, and the pressurized fluid stored in the reservoir is fed to the fluid feeding line automatically.

Abstract: An ejector pump which is used with a suction disk for carrying an article. In the bore of a pump body, there are fitted a nozzle block having a nozzle opening and an ejector block which has an ejector opening aligned with the nozzle opening of the nozzle block, so that suction chamber formed between the nozzle opening and the ejector opening may communicate with a suction port which is formed in one side of the pump body. In the bore of the pump body, too, is disposed an electromagnetic valve which has a moving member for opening and closing the entrance of the nozzle opening with its leading end position.

Abstract: A fixed ceiling is provided from which depends a carrier block which is movable forward, rearward, rightward and leftward. An exhaust port is provided on the upper surface of the carrier block and a seal member is provided on the surface of the carrier block about its periphery so that a vacuum can be created on the upper surface of the carrier block and the carrier block may be freely sucked to the fixed ceiling. Vertically movable fitting parts for a plurality of tools are provided below the carrier block.

Abstract: A nut means engages with a thread formed on an outside surface of the cylindrical form valve body. A valve member having a flow restricting means such as needle valve device on one end is fitted slidably within the valve body and the same is connected to the nut means with an engaging member which is slidably fitted within a slit formed lengthwise on said threaded surface and engages with the valve member and the nut means.Fluid flow in the valve body is regulated by moving said valve member by turning said nut means. Thus the flow regulating valve of very compact form and capable of making fine adjustment of the flow rate can be provided because the conventional valve stem which engages with the internal thread of the valve body and projecting out therefrom for regulating flow is not used, and the adjustment is made with the thread of comparatively large diameter. Such flow regulating valve can be used suitably for controlling piston speed of power cylinder by providing the check valve therein.

Abstract: The present invention relates to a vacuum controlling device wherein a vacuum can be obtained by jetting compressed air, a predetermined vacuum state can be automatically confirmed and further the vacuum state can be quickly released by switching compressed air.

Abstract: A device for obtaining a vacuum by jetting compressed air characterized in that compressed air, that is, a vacuum state can be switched by changing the internal member fitting position so as to be in a form in response to the use and the manufacture is very easy.