Abstract: A clamp device includes a support mechanism that supports a grip member when expanding the diameter thereof, a clamping hydraulic cylinder that can drive the grip member and a clamp rod axially forwards and backwards (up and down), and a main body member to which the grip member, the clamp rod, the support mechanism, and the clamping hydraulic cylinder are mounted, with the grip member, the clamp rod, and the support mechanism being positioned at one end portion of the body member, and with the common axis of the grip member and the clamp rod being offset from the axis of the clamping hydraulic cylinder in a direction orthogonal to the clamp rod.

Abstract: The injection molding machine has a fixed platen and a movable platen for fixing a pair of molds; a pair of clamp plates mounted to the fixed platen and the movable platen, respectively, and having a fixation surface for mold fixation, respectively; and magnetic force generation mechanisms for generating a magnetic force for fixing the molds to the fixation surfaces. An air-gap formation mechanism is provided at least in one of the clamp plates for automatically forming air-gaps between the fixation surfaces and the molds in association with the movement start of the movable platen while the magnetic force generation mechanisms are inactivated for detaching the molds from the fixation surfaces.

Abstract: A positioning mechanism in a positioning and clamping device includes an annular tapered surface that is formed on an outer periphery of a cylindrical shaft for positioning a pallet in the horizontal direction, and has a decreasing diameter toward an axial tip of the cylindrical shaft. An annular engaging mechanism, which is formed on an inner periphery side portion of an annular engagement member, is engageable with the annular tapered surface, and is elastically deformed in the radial direction, as a result of engagement with the annular tapered surface. The engaging mechanism has a tapered ring portion, which makes a face contact with the annular tapered surface, and multiple ribs extending outward, radially, from the tapered ring portion.

Abstract: A tool unclamping device according to the present invention comprises a motor, a rotary shaft connected to the motor, a cam provided on the rotary shaft, a power transmission member, pressed by the cam to be axially movable, having a recess at the center in the radial direction thereof, a frame so provided as to enclose the power transmission mechanism, a support member inserted into the power transmission mechanism in the radial direction thereof and fixed to the frame, an elastic member set in the recess located between the power transmission member and the support member for urging the power transmission member toward the motor and an output shaft driven by power from the power transmission mechanism for unclamping a tool.

Abstract: Each of a plurality of injection molding machines is provided with clamp plates fixed on platens and a plurality of magnet units to generate magnetic force for fixing a mold to the clamp plate fitted on the clamp plates; and the plurality of injection molding machines are provided with a plurality of common connectors having the same structure, each of which is electrically connected to the magnetic unit, a molding machine control unit and a power source device; and the mold fixing system comprises a set of operation control units to be shared by the plurality of injection molding machines, and when a mold is to be exchanged in any of the injection molding machines, the plurality of magnet units are switched to the non-adsorbing state or the adsorbing state via the operation control unit in the state where the operation control unit is connected to the common connector of the injection molding machine.

Abstract: The injection molding machine has a fixed platen and a movable platen for fixing a pair of molds; a pair of clamp plates mounted to the fixed platen and the movable platen, respectively, and having a fixation surface for mold fixation, respectively; and magnetic force generation mechanisms for generating a magnetic force for fixing the molds to the fixation surfaces, and, an air-gap formation means for automatically forming air-gaps between the fixation surfaces and the molds in association with the movement start of the movable platen while the magnetic force generation mechanisms are inactivated for detaching the molds from the fixation surfaces is provided at least in one of the clamp plates.

Abstract: A main shaft includes a plurality of elastic engagement pieces arrayed along an outer perimeter of an attachment hole. During and after assembly, the elastic engagement pieces elastically abut at least an outer surface of a tapered shank in a tool holder and deform slightly in a radial direction. The elastic engagement pieces provide uniform engagement force between the main shaft and the tool holder over a broad surface area. An elastic flange provides additional elastic engagement and easy separation from the main shaft. Together, the elastic engagement pieces and elastic flange reliably engage and securely attach the main shaft to the tool holder while aiding disengagement.

Abstract: A gas spring (7) comprises a cylinder main body (20); a rod member (21) slidable to cylinder main body; a gas filled chamber (23) filled with compressed gas and urging the rod member in a first direction; a rod inserting hole (32) inserting the rod member (21); an annular collar (24) slidable on the rod member at a position apart from the rod inserting hole in the second direction opposite to the first direction; an annular groove (24a) on the annular collar which is open toward the second direction; and a lock ring (26) engaging with an annular ring mounting groove (25) on the rod member (21). In assembling, the lock ring (26) is moved in the first direction together with the rod member, to thus engage with the annular groove (24a) on the annular collar, so that the annular collar for stopping the rod member and the lock ring is stopped by an end wall of the cylinder main body.

Abstract: A workpiece support has a simplified structure and can operate with improved dependability and reliability. The workpiece support has a rod, a sleeve body externally fitted on the rod and elastically deformable so as to shrink in diameter, a case member supporting the sleeve body, and an external peripheral hydraulic chamber formed on the external periphery of the sleeve body. A hydraulic cylinder is provided for moving the rod in the axial direction and oil passage are provided for connecting the hydraulic operating chamber of the hydraulic cylinder with the external peripheral hydraulic chamber when the piston member of the hydraulic cylinder has moved up to or to the vicinity of the stroke end thereof.

Abstract: A workpiece support provides enhanced reliability of operation and enhanced durability. The workpiece support comprises a rod, a sleeve body, a case member, a scraper, an external peripheral hydraulic chamber, and oil passages, and is further provided with an air passage formed between the rod and the internal peripheral surface of the sleeve body, and connected to the small gap between the rod and the scraper, and an air input port for supplying compressed air to the air passage; wherein compressed air is supplied from the air input port to the air passage and expelled from the small gap between the rod and the scraper when the rod is retracted.

Abstract: A clamp device is disclosed which maintains a stable clamped state, even if an object to be fixed, being a work pallet or die, is clamped in a repeated fashion, and which is compact in size and yet capable of clamping the object to be fixed with a large clamping force.

Abstract: A gas spring has a cylinder body, a rod member internally slidably fitted in the cylinder body, and a gas chamber which is formed inside the cylinder body and filled with compressed gas. The seal members for sealing between the cylinder body and the rod member are disposed at both sides of the gas chamber, while ring members for partitioning the gas chamber are disposed at the end portions of the gas chamber close to the seal members, and accordingly, annular grease chambers for grease between the seal member and the ring member are formed, and it is possible to prevent grease shortage by the grease in the grease chambers.

Abstract: A clamping device 2 is provided with a hydraulic cylinder 7 for biasing a collet member 5 upward via a collet supporting member 6 and driving a pull rod 4 downward. A piston member 30 has a greater pressure receiving area than the collet supporting member 6 in the circular hydraulic chamber 31 of the hydraulic cylinder 7. Therefore, the hydraulic cylinder 7 can drive the pull rod 4 downward while the collet member 5 is biased upward. Meanwhile, the collet 5a of the collet member 5 is resiliently deformed in a diametrically expanding manner to engage in the vertical bore 1b of a workpiece 1 while slightly moving downward, ensuring a secure locking of the workpiece 1 to a workpiece receiving surface 3a.

Abstract: The present invention presents a work pallet positioning and fixing device capable of positioning in both horizontal and vertical directions through elastic deformation of an annular engaging portion, wherein the engaging portion can elastically deform along the entire periphery and even locally in a circumferential direction thereof.

Abstract: A work pallet that is arranged to be simple in construction capable of machining five faces of a work by rotating it around the axis of rotation. A work pallet (4) comprises a base body (5) detachably fixed to the table (3) of a machine-tool (1), a pallet main body (6) fixed on the top face of this base body (5), and a work setting face forming body (7), provided on this pallet main body (6) in a way to turn around the rotational axis (20) and having a work setting face (21a) for fixing a work (2), and the pallet main body (6) is provided with a clamping mechanism (31) for releasably fixing the work setting face forming body (7), and a rotational driving mechanism (32) for rotationally driving the work setting face forming body (7) around the rotational axis (20).

Abstract: A gas spring comprising a cylinder body filled with compressed gas and an upright rod passing through a rod side end wall member of the cylinder body. By supporting a main shaft unit with the gas spring, the load on a vertical displacement mechanism is reduced. A pair of upper and lower ring-shaped seal members, which seal between the rod end wall member and the rod, are provided inside the rod wall member. Ring-shaped oil filling chambers are formed in between the ring-shaped seal members and between the rod end wall member and the rod. An oil filling mechanism fills the oil filling chambers with lubrication oil.

Abstract: The abutment of the rod to the work piece is accomplished in a stable manner by providing an air passage in the inside of the work support for supplying pressurized air for detecting the abutment between the rod and the work piece. Work support is equipped with case, rod, sleeve that elastically deforms to reduce its diameter, hydraulic cylinder for driving rod in an advancing direction, spring for elastically energizing rod in advancing direction, detection nozzle for ejecting pressurized air, air passage connected to detection nozzle, sensor for detecting abutment between the tip of rod and work piece based on air pressure, and a control unit. Work piece is supported by the tip of rod abutting work piece while ejecting pressurized air from detection nozzle, and locks rod by elastically deforming sleeve to reduce its diameter after detecting the abutment of rod by a pressure sensor and control unit.

Abstract: A machine tool main spindle balancer wherein the annular sealing members of a gas spring that supports the main spindle unit to reduce the load of an elevating mechanism are easily replaceable. A gas spring of a machine tool main spindle balancer comprises a cylinder body, which is filled with a compressed gas, a rod that extends downward from the inside of cylinder body, a head-side end wall member of cylinder body having a filling valve, a sleeve member forming a circumferential wall around a rod insertion hole mounted hermetically and detachably on a rod-side end wall member, and annular sealing members and mounted on said sleeve member, so that annular sealing members can be replaced easily by discharging the compressed gas, and removing only sleeve member while holding rod on head-side end wall member.

Abstract: A clamp system includes a plurality of clamping devices arrayed along at least a first hydraulic supply loop and a plurality of support devices arrayed along at least a second hydraulic supply loop. The clamping devices may include vertical rotating clamping devices which rotate vertically to secure a workpiece to a base plate. The clamping devices may also include horizontally rotating clamping devices which rotate axially and extend vertically to clamp the workpiece. The support devices support and stabilize the workpiece during machining operations. The first and second hydraulic supply loops are interconnected and allow the clamping devices to clamp the workpiece before the support pieces support the workpiece. The second hydraulic supply loop boosts support to and locks the support devices for additional stability.

Abstract: A robot hand tool linkage device includes a locking mechanism and an actuation shaft driven between a lock position and a release position. A piston moves an actuation shaft upward and downward to cam outward a plurality push rods urging outward a plurality arc-shaped locking members. The locking members are captured under an arcuate surface of a tool plate which is thereby attached. A resilient member engages an outer groove in each of the locking members to urge them inward. When the outward force on the locking members is released, the resilient member moves the locking members inward to reduce their combined diameter sufficiently to disengage from the arcuate surface, and thereby to release the tool plate.