Abstract: A machine such as a machine tool includes a pair of spaced platforms. One platform (11, 31, 185, 72, 159, 142) may mount an operator such as a tool in a spindle and the other platforms (10, 20, 180, 170, 144, 163) may mount an object such as a workpiece. The spaced platforms are joined by six powered and extensible legs (20-25, 40-45, 64-69, 145-150, 166, 182-84, 187-89) joined to the respective platforms by universal joints. The length of the legs is individually manipulated to vary the position of the platforms and, therefore, the object and operator relative to each other in six axes. The powered legs may be hydraulic cylinders (20-25) or recirculating ball screw driven (195, 197, 198). The distance between the spaced platforms may be measured by separate extensible instrument arms (130, 131, 171) which join the platforms. The instrument arms may use a digital position device (238, 240) to measure the extension and contraction of the instrument arms or may use a laser interferometer (267) for that purpose.
February 20, 1992
Date of Patent:
October 11, 1994
Kearney & Trecker Corporation
Paul C. Sheldon, Edward E. Kirkham, Lyle D. Ostby, Bruce P. Konkel
Abstract: A machining system is provided which includes a selected number of machining centers for selectively cutting or machining metallic parts, the system further including a rack structure for providing inventory storage for parts which are to be machined by the centers. There is further provided a part transport device for moving a given one of the parts in a first part flow loop when the given part is in a condition which enables the part to be readily moved around a plant or other manufacturing establishment or to be shipped in commerce. The part transport device also moves the given part through a second part flow loop when the part is in a condition which enables the part to be machined by one of the machining centers.
Abstract: A probe device (10) for a machine tool includes a part sensing device (28) attached to the end of a piston rod (26), movable along a cylinder (12) mounted on the machine tool spindle head (14). The rod (26) is attached to a piston (42) that is air actuated to extend or retract the rod (26) to respectively move the sensing device (28) to a part measurement position outside the cylinder (12), or to a protected position within the cylinder. When the device (28) is in its measurement position the spindle had (14) is selectively moved to bring device (28) into contact with a machined part to determine the accuracy of machining.
Abstract: A tool clamping mechanism (12) is provided for a tool engaging arm having a frame or chassis (18) which is moved along a path of travel toward a tool (47). The mechanism includes a tool contact member or tongue (60) and preferably includes a pair of spaced apart fingers (40) positioned to engage a groove formed in the tool (47). The tongue (60) is mounted for movement along the path of travel with the frame, such as by means of bar (62) joined to the fingers, a pin (67) supported by the bar and projecting through a slot in the tongue (60), and a rod (72) attached to the tongue which extends into the frame (18) along a bore (75). Such mounting arrangement enables the frame (18) to continue to move toward the tool (47) after the tongue (60) has contacted the tool, thereby achieving relative motion between the frame (18) and tongue (60).
Abstract: A carriage for a machine tool includes ways (16) and (18), a base (14) supporting the ways and a saddle (20) supported by bearings (22) and (24) for movement along the ways to carry a column (26) along the X-axis of the machine tool. The load bearing surface (16a) of way (16) is located at a higher level above machine tool support surface (16a) than the load bearing surface (18a) of way (18). Thrust directed against column (26) in the course of a machining operation is transmitted to saddle (20) through Z-axis ways 40 and way bearings (42), and is transmitted from saddle (20) to thrust bearing surface (16c) of way (16).
Abstract: A composite for constructing an article which is composed of a nonmetallic substance as represented by igneous rock of different particle sizes which are compacted and then surrounded by a solidified plastic resin. In a preferred manner, the igneous rock material is a selected type of basalt with the basalt particles being of different mesh sizes to be compacted into a mold. After compaction, the plastic resin as represented by an epoxy resin is introduced into the mold so as to displace air from any voids surrounding the basalt particles and to surround them with a resin which later solidifies. A novel resin delivery system is also presented.
March 23, 1984
Date of Patent:
November 15, 1988
Kearney & Trecker Corporation
Richard Johnstone, Edward E. Kirkham, Edward J. Hummelt
Abstract: A numerically controlled automatic tool changing machining center is provided with a rotary driven spindle concentric within which is a spindle bar that may be reciprocated out from or into the spindle by a hydraulic cylinder. Located at the forward end of the spindle bar is a tool receiving socket which is operative to releasably engage the shank of a single toolholder or multiple spindle toolhead transferred to the spindle bar from the machine tool storage magazine by a tool transfer arm. When a large, single toolholder is engaged by the spindle bar, the spindle bar is retracted into the spindle to urge the large single toolholder against the nose of the spindle.
Abstract: A tool measuring apparatus for a machine tool is provided with a plunger (16) mounted to move along an axis (22) to vary the spacing between the end of the plunger and an inductive element (26) of an inductive displacement measuring device (24). Device (24) generates a signal V.sub.y which varies as a function of the spacing between the plunger (16) and device (24). Spindle (14), engaging a tool (12), is moved to a position M located a known distance from inductive element (26). As the spindle is moved to position M, tool (12) engages plunger 16 and moves the plunger to decrease the spacing between the plunger and the element (26) to a value S.sub.3, corresponding to an unknown length d of tool (12). Levels of V.sub.y corresponding to spacing S.sub.3 and to S.sub.2, representing a known nominal value N of tool length, are coupled to a processor 32 and a control 30 to determine tool offset e, i.e., the difference between actual length d and nominal length N.
Abstract: A magazine (10) for a machine tool (not shown) comprises a number of links (12) joined together by pins (14) to form a closed chain (16). A socket (32) is formed in each link for receiving a tool (34) to position the tool center line (36) midway between and in parallel relation with, the axes (40) of the two pins (14) which join the link to adjacent links in the chain (16). A frame (18) supports the chain (16) and received tools (34) for movement along a path of travel to selectively position the tools, the path including sections (26) of little or no curvature, and sections (28, 30) of substantial curvature. To maintain tool movement precisely along the path of travel, and thus prevent contact between tools in adjacent links (12) when the adjacent links travel around a section (28, 30) of substantial curvature, guide bearings (54) are joined to the links and constrained to move along a channel (56) which is in parallel relation with the desired chain path of travel.
Abstract: A high speed toolholder for driving a small high speed cutting tool from the large slow speed spindle of a machining center comprises a housing having a retention pin extending from side end thereof. An input shaft, dimensioned to be received in the machining center spindle, is rotatably journaled into the toolholder housing parallel to the retention pin. Rotatably journaled into the opposite side of the housing so as to be coaxial with the input shaft is an output shaft whose distal end has a tapered bore therein dimensioned to receive the shank of a high speed cutting tool. Within the housing, each of the input and output shaft carry a separate one of a pair of sheaves which are each lined by a V-belt to a separate one of a pair of sheave members on a step sheave rotatably journaled in the housing parallel to the input and output shaft.
Abstract: A rotary shuttle (10) for a machine tool (11) in which no power mechanism is required for moving the pallet (14, 15) with the workpiece off of the shuttle (10) and on to the machine tool worktable (13A) or for withdrawing a pallet (14, 15) with the completed workpiece on it off of the machine tool worktable (13A) and back on to the shuttle (14, 15). A rotatable shuttle (10) is presented with a workpiece support which can also be raised and lowered with pallets (14, 15), which in conjunction with an indexing table (13) moves workpieces between the worktable (13A) and a workpiece support (16, 19). A frame (66) of the shuttle mechanism (10) includes an offset rotatable section (65) which is arranged to extend over a portion (79) of the indexing table (13) with the shuttle mechanism (10) including support arms (16, 19) in conjunction with the offset rotatable section to extend over a portion of the indexing table (13).
Abstract: A gear change mechanism for a machine tool in which shifting forks with sliding gears and constant mesh gearing using clutch and/or brake shifting is eliminated. A shiftable gear mechanism is presented in a gear train for meshing engagement with any one of a plurality of gears for selectively varying the speed of the machine spindle. The shiftable gear mechanism includes a first rotatable shaft and a second shaft connected to a cluster gear positioned to slide and rotate the second shaft in relation to the first shaft. A cylinder apparatus is connected coaxially to the second shaft to slide the second shaft in a reciprocating manner along the first shaft so as to move the cluster gear and vary the gear ratios between the cluster gear and the other gears in the gear train. A bearing assembly is also utilized in conjunction with the second slidable shaft so as to prevent any sliding action between the cluster gear and the shifting mechanism.
Abstract: An apparatus for angularly orienting a machine tool spindle (24) to a keylock position includes a resolver (39) which is directly mounted on a shaft (13) of a spindle drive motor (12), the spindle (24) rotating synchronously with the shaft (13) through a shiftable gear train. Resolver (39) is connected to update a register (45) so that the count shown by the register indicates the angular position of shaft (13) with respect to the spindle head (11) as the shaft rotates. During synchronous rotation, a target (33) revolving with the spindle causes a proximity sensor (32) on the spindle head (11) to generate a pulse when the spindle (24) is in a known orientation relative to the spindle head (11). When a pulse occurs a data processing unit (46) of a numerical control circuit (42) compares the actual count in register (45) with a number of possible count values contained in a data storage table (44).
Abstract: Three machine tools are positioned in spaced apart relationship at the corners of a triangle. Each machine tool has a worktable which is rotatably mounted on a corresponding bed for rotation about a corresponding vertical axis. Each worktable has guide means for slidably receiving a pallet carrying one or more workpieces. At least three workpiece transfer units are each positioned adjacent to the worktable of a corresponding machine tool for interaction therewith. Each workpiece transfer unit has guide means for slidably receiving a pallet and has a hydraulically actuated slide which engages the pallet and moves it along the guide means to transfer the pallet from one machine tool to the adjacent machine tool. One or more workpieces are clamped on each pallet. The pallets are introduced into the loop at an operator's station.
Abstract: An automatic dynamic error compensator for compensating the position error arising within a servo drive system includes a measuring head which is operative to measure the relative indicated position of two or more measuring vanes on the movable member. The measuring head, together with a feedback transducer, that measures indicated movable member position, are coupled to a feedback system. The feedback system determines the indicated movable member position from the feedback transducer reading and then compares the indicated movable member position to the known vane position upon occurrence of a vane crossing to yield a compensating value.
June 29, 1983
Date of Patent:
December 9, 1986
Kearney & Trecker Corporation
Richard Johnstone, Edward E. Kirkham, Han C. Chung, Lyle D. Ostby
Abstract: A device (10) for measuring the difference in elevation between first and second substantially horizontal surfaces (12a, 12b) includes first and second chambers (10a, 10b) respectively located on the surfaces (12a, 12b). The chambers contain quantities of a fluid such as mercury (116) and are coupled together through a conduit (20) which enables mercury (116) to flow between them as required, so that the mercury levels in the chambers will be in the same horizontal plane. A first device (140a) is mounted at a first distance above the fluid in the first chamber and at a fixed distance above the first surface (12a). Likewise, a second device (140b) is mounted at a second distance above the fluid in the second chamber, and at the same fixed distance above the second surface (12b).
Abstract: A tool changer for interchanging tools between a machine tool and a magazine in a minimum amount of time so as to reduce the down time of a machine tool. The tool changer includes a frame or base member for mounting on the machine tool with the frame member presenting at least two spaced apart mounting planes. Two tool change arm members are rotatably mounted on the frame and in the spaced apart mounting planes. A drive mechanism affords a reciprocating rotatable motion as well as a linear motion of each arm member so as to effect a motion similar to a fourbar linkage and a parabolic motion to the arm members. Each arm member has a clamping portion to grip tools in a firm but releasable manner. In a preferred manner, the arms are rotated through an arc of 180.degree. and the clamping members are positioned 90.degree. out of phase from each other. Also preferably the mounting planes are positioned at an angle of 45.degree.
Abstract: A numerically controlled automatic tool changing machining center is provided with a rotary driven spindle concentric within which is a spindle bar that may be reciprocated out from or into the spindle by a hydraulic cylinder. Located at the forward end of the spindle bar is a tool receiving socket which is operative to releaseably engage the shank of a single toolholder or multiple spindle toolhead transferred to the spindle bar from the machine tool storage magazine by a tool transfer arm. When a large, single toolholder is engaged by the spindle bar, the spindle bar is retracted into the spindle to urge the large single toolholder against the nose of the spindle.
Abstract: A machine tool having a numerically controlled adjustable arbor for facilitating different straddle milling operations on random workpieces without the need for manual adjustment of the cutter width comprises a frame which carries a power station thereon. The power station has a rotary driven spindle which is journaled within a quill which is movable out from and into the power station under numerical control. A bifurcated arbor, configured of a pair of coaxial shafts which are in sleeved engagement with each other so as to be axially movable to and from each other while rotating co-jointly with each other, is coupled at one end to the power station spindle and is journaled at its distal end in a fixed arbor support. Each shaft of the bifurcated arbor carries a straddle milling cutter thereon in spaced apart relationship with the cutter on the other arbor member.
Abstract: A motorized nut for use in conjunction with a fixedly secured lead screw for displacing a movable member along a fixed member into which the lead screw is journaled parallel to the desired path of member movement, includes an induction motor whose case is rigidly secured to the movable member. The motor rotor is made hollow so as to allow the lead screw to extend coaxially therethrough. A pair of nuts are each secured in a separate one of the ends of the tubular motor rotor for threadedly engaging the lead screw so that as the motor rotor rotates in response to motor excitation, the motor stator and hence, the movable member, are displaced on the movable member along the axis of the ball screw.