Abstract: The induction coil unit (1) for heating a sleeve section (3) of a tool holder (5) holding the shaft (13) of a rotation tool in a receiver opening (11) in press fit comprises two coil units (21, 23), whose distance can be changed selectively through at least one slanted surface cam assembly (43). A magnetic flux concentrator assembly (33) with several concentrator elements (55) distributed in circumferential direction is associated with the coil unit (21) adjacent to the free end (15) of the sleeve section (3). The width of a pass through opening (57) defined by the concentrator elements (55) for the tool shaft (13) is also changeable through a control cam (69), to which the concentrator elements (55) are coupled through a slanted surface cam assembly (73). The two slanted surface cam assemblies (43, 73) are coupled amongst each other in a useful manner in order to simplify the operation of the unit (1).

Abstract: A circuit 1 for controlling the supply of electrical power to an induction coil 2, in particular to an induction coil 2 for heating a shrink attachment for tools, comprises a rectifier 3, having an input 3a, 3b, 3c for feeding an input power, and a rectifier output. The circuit 1 furthermore comprises an inverter 5 for putting out an AC-voltage, having an input and an inverter output 5a, 5b for connecting the induction coil 2, an intermediary circuit 4 for connecting the rectifier 3 with the inverter 5, and a regulation unit for regulating the power supplied to the induction coil 2. A measurement apparatus 6 for measuring a voltage A2 as an input variable for the regulation unit is connected to the output side of the inverter 5. A respective method for regulating the power supplied to the induction coil 2 comprises a regulation step, in which the current A2 supplied to the induction coil 2 is used as an input variable for the regulation of the power supplied to the induction coil 2.

Abstract: The aim of the invention is to improve the guiding of a lubricant through a tool holder in a small quantity lubrication system. According to the invention, a tool holder (1) comprises, in the maintaining body thereof (3), an axially displaceable stop sleeve (45) which is mounted in a through opening (31) which is connected to the receiving opening (13) for a tool shaft (15) and a stop surface (47) which is adjacent to the front end (23) of the tool shaft (15). Said stop sleeve (45) is screwed into an inner thread (43) of the through opening (31) and is coupled in a rotationally fixed manner, but in an axially displaceable manner, to a control tube (49) which engages in said stop sleeve (45) in an axial manner. Said control tube (49) is mounted in an axially fixed manner to the side thereof, but in a rotatable manner to the fluid coupling (27). A lubricant can be guided over the blades of the tool (9) by means of the fluid coupling (27), the control tube (49), the stop sleeve (45) and channels (17).

Abstract: A tool holder for a tool which can be rotated about an axis of rotation, in particular a drilling, milling or reaming tool, comprises a clamping shank which, in an end shank region (7), has an accommodating opening (9) which is central in relation to the axis of rotation and is intended for accommodating a retaining shank of the tool. Clamping surfaces for securing the retaining shank of the tool with a press fit are arranged on the circumferential casing of the accommodating opening. According to the invention, the end shank region (7) of the clamping shank has a plurality of at least more or less axially extending tension spokes (13) distributed in the circumferential direction, it being possible for said tension spokes to be subjected to an essentially radially outwardly directed tensile force in order for the clamping surfaces to be spread apart radially from one another.

Abstract: A tool holder is disclosed for a boring, milling or reaming tool that can rotate about an axis of rotation. At the end of its clamping shank that is located on the side of the tool, the tool holder has a bush part with a mounting opening, which is centered with regard to the axis of rotation and which is provided for accommodating a fixing shank of the tool. The mounting opening for a bush part can be radially expanded to a width, which enables the fixing shank to be inserted or removed, particularly by means of eddy currents that are magnetically induced inside the bush part by an induction coil. In addition, the mounting opening can, by cooling, be radially contracted to a width that holds the fixing shank with an interference fit.

Abstract: A centering device, in particular for a tracer-type measuring instrument (1), is proposed. The centering device comprises an instrument carrier (3) defining an instrument axis (7), a carrying shank (41) defining a shank axis (43) and a centering holder (45) holding the instrument carrier (3), with the instrument axis (7) parallel to the shank axis (43), radially movably to the latter, but so as to be capable of being fixed to the carrying shank (41). The centering holder (45) is designed as a parallelogram guide with a parallelogram-link region (59), or a plurality of these regions, distributed about the shank axis (43) and the instrument axis (47) and extending along these axes (7, 43). Such a parallelogram guide may be integrally formed in one piece on the carrying shank (41) and/or on the instrument carrier (3), thus reducing the outlay in terms of production.

Abstract: A shrinking arrangement for a tool holder (12) which retains a rotary tool (10) with a press fit in a central accommodating opening (20) comprises an accommodating unit (24) for accommodating the tool holder and a temperature-controlling arrangement (46, 64) at least for the thermal expansion, in particular also for subsequent cooling, of the tool holder in the region of the accommodating opening. According to the invention, the accommodating unit is arranged on a carriage (32) which is guided such that it can be displaced in the longitudinal direction of the rails of a rail system (30), which runs parallel to the axis (16) of the tool holder accommodated in the accommodating unit and is fastened on a supporting base (28), and it being possible for said carriage to be moved along its displacement path into at least one region of action of the temperature-controlling arrangement.

Abstract: A multicoordinate sensing measuring device is proposed in which a sensing lever (5) that is resiliently spring-pretensioned in a resting position in a housing (3) can be displaced along a measuring axis (7) and can be pivoted transversely to the measuring axis (7). A connecting piece (25) is guided in a movable manner in the direction of the measuring axis (7) on a guide surface (23) of the housing (3). The sensing lever carries along the connecting piece (25) via a linkage (31, 33) when the sensing arm (5) is displaced in the direction of the measuring axis (7) as well as when the sensing arm is deflected in the direction of the measuring axis (7). A measuring device (21) detects the position of the connecting piece (25) relative to the housing (3).

Abstract: The invention relates to a tool holder for receiving a tool, especially a boring, milling, or grinding tool, which can be rotated about a rotational axis and which comprises a clamping shank. In a preferred form of embodiment, said clamping shank comprises a receiving opening (9) which is centrically arranged in an end socket (7) in relation to the rotational axis, said end socket being closed in an annular manner and said receiving opening being used for the interference fit of a holding shank pertaining to the tool. The end socket (7) contains a plurality of pressure chambers which are distributed in the circumferential direction and which extend at least approximately in the direction of the rotational axis. Said pressure chambers (13) can be connected to a pressure means supply which is especially hydraulic, in order to radially expand the receiving opening (9).

Abstract: The induction coil (13) of an arrangement which heats a tool-holder (1) inductively for the purpose of changing a tool shank (11) retained with a press-fit therein has a winding (19), in the case of which the number of coil turns per unit of length in the direction of the coil axis and/or the number of coil turns per unit of surface area is smaller in an intermediate region located, in the direction of the coil axis, between two main winding regions (21, 23) than in the two main winding regions (21, 23) and/or the internal winding diameter is smaller in the two main winding regions (21, 23) than in the intermediate region and/or, at least in an axial sub-region of the induction coil (13), increases from the two main winding regions (21, 23) in the direction of the intermediate region.

Abstract: An apparatus for inductively heating a sleeve section, having a central holding opening for a shank of a rotary tool, of a tool holder that holds the shank in the holding opening in a press fit and releases it upon heating. The apparatus includes an induction coil arrangement with at least one induction coil, a generator that feeds the induction coil arrangement with electric current of periodically varying amplitude, and a yoke arrangement of magnetizable material, which concentrates the magnetic flux of the induction coil onto the sleeve section in a fashion distributed all around. The induction coil is axially offset from the tool holder axis of rotation, in particular substantially radially next to the axis of rotation, and does not wrap around the section. Furthermore, the induction coil includes a coil core, of magnetizable material, that is connected in a magnetically conducting fashion to the yoke arrangement.

Abstract: The induction coil of a device that heats a toolholder (1) inductively for the tool change comprises a shielding collar (27) of magnetizable material which, firstly, concentrates the magnetic flux of the induction coil (13) in a sleeve section (5) of the toolholder (1) which holds the shaft (11) of a rotary tool with a press fit and, secondly, shields the part of the tool shaft (11) that projects out of the sleeve extension (5), in order to facilitate unclamping the tool from the toolholder (1). On its side facing the winding (19) of the induction coil (13) axially, the shielding collar (27) has an outer circumferential surface (31) which widens conically away from the sleeve extension (5) and an axial height (h) which is at least 1.5 times the diameter (d) of the tool shaft (11). The shielding collar (27) runs on all sides at a distance from a yoke shell (23) of magnetizable material which encases the winding (19) of the induction coil (13).

Abstract: The adjustable-length tool holder for a rotating tool comprises a base element (7) which is provided with a coupling shank (9) for connecting to a machine tool and which, axially remote from the coupling shank (9), ends in a sleeve part (11) forming a central locating opening (13). The tool holder also comprises a plurality of tubular-cylindrical extension sleeves (15, 19) which in turn each form a central locating opening (17, 21) and of which a first extension sleeve (15) is arranged in an interference fit in the locating opening (13) of the sleeve part (11) in such a way that it can be positioned in an axially variable manner, and each of the further extension sleeves (19) is arranged in an interference fit in the locating opening (17) of the adjacent extension sleeve (15) toward the base element (7) in such a way that it can be positioned in an axially variable manner.

Abstract: A clamping device for clamping a machine element (3), in particular a tool holder for a drilling, milling or grinding tool or the like, which rotates about an axis of rotation (9), comprises a base body unit (11) which has a receiving opening (21) which is central with respect to the axis of rotation (9) and into which a coupling shank (5) of the machine element (3) can be fitted axially from one end, a chuck (23) which is arranged in the receiving opening (21), and a chuck-actuating unit (25), which is guided on the base body unit (11) in such a manner that it can be displaced in the axial direction relative to the latter, for actuating the chuck (23).

Abstract: The adjustable-length tool holder for a rotating tool comprises a base element (7) which is provided with a coupling shank (9) for connecting to a machine tool and which, axially remote from the coupling shank (9), ends in a sleeve part (11) forming a central locating opening (13). The tool holder also comprises a plurality of tubular-cylindrical extension sleeves (15, 19) which in turn each form a central locating opening (17, 21) and of which a first extension sleeve (15) is arranged in an interference fit in the locating opening (13) of the sleeve part (11) in such a way that it can be positioned in an axially variable manner, and each of the further extension sleeves (19) is arranged in an interference fit in the locating opening (17) of the adjacent extension sleeve (15) toward the base element (7) in such a way that it can be positioned in an axially variable manner.

Abstract: A shrinking arrangement for a tool holder (12) which retains a rotary tool (10) with a press fit in a central accommodating opening (20) comprises an accommodating unit (24) for accommodating the tool holder and a temperature-controlling arrangement (46, 64) at least for the thermal expansion, in particular also for subsequent cooling, of the tool holder in the region of the accommodating opening. According to the invention, the accommodating unit is arranged on a carriage (32) which is guided such that it can be displaced in the longitudinal direction of the rails of a rail system (30), which runs parallel to the axis (16) of the tool holder accommodated in the accommodating unit and is fastened on a supporting base (28), and it being possible for said carriage to be moved along its displacement path into at least one region of action of the temperature-controlling arrangement.