Carl Hurth Maschinen- Und Zahnradfabrik Gmbh & Co.

Heinrich R Fischer

Johann Spensberger

Richard Mueller

Walter Schmidkunz

Karl Buschhoff

A method and apparatus for the rolling drive of a gear grinding machine. The rotation portion of the rolling movement of the workpiece is effected by roll bands, which at one end are secured to a roll-band carriage movable back and forth with respect to the workpiece axis and at the other end are secured to a roll cam and roll onto and off therefrom. The roll cam and the workpiece are supported on a roll-cam carriage movable back and forth parallel to the roll-band carriage. The roll-band carriage and the roll-cam carriage can be driven at a substantially phase-equal movement. The relationship between the stroke of the roll-band carriage and the roll-cam carriage can be adjusted corresponding with the difference between the diameter of the roll cam and of the workpiece. To control the drive of the roll-band carriage, on the one hand the path covered above ground by the roll-cam carriage and on the other hand the distance between the roll-cam carriage and the roll-band carriage is determined in intervals, the relationship between these two values is calculated and is compared with a desired value corresponding with the adjusted stroke relationship, and the drive of the roll-band carriage is corrected corresponding with a determined deviation.

Method and device for controlling the rolling drive of a gear grinding

A method and an apparatus for the chamfering of the axially facing ends of toothed cylindrical or conical workpieces in which a cutting tool arranged on a rocking lever is moved back and forth in response to the peripheral speed of the workpiece which constantly rotates about its axis. The cutting edge of the tool acts chip-removingly during each stroke that is directed onto or toward the axially facing surface of each tooth of the workpiece. The cutting edge moves along a circular segment path, the axis of which extends at least approximately parallel to a radial of the workpiece, which radial starts out from the workpiece axis and extends through the tooth which is to be worked or machined.

Method for chamfering the axially facing ends of toothed workpieces, a

An apparatus for orienting the position of a machine tool carriage relative to a stationary machine part, which machine tool carriage is movable in a plane defined by orthogonally related X and Y axes. In a first embodiment, the carriage is freely movable on a holder parallel with respect to the X axis and the holder is arranged freely movably in the stationary machine part parallel with respect to the Y axis. In a different embodiment, two pairs of steering knuckle arms are provided and which are arranged symmetrically with respect to the carriage. Each pair of arms consists of two hingedly connected steering knuckle arms which define a right angle with one of each thereof being hinged to the carriage, the other one to the stationary machine part. Two modifications are described for the design of the joints. The apparatus can be used, for example in machines for the precision working of gears.

Apparatus for orienting the position of a machine tool carriage relative

A method and an apparatus for shaving, rolling or similar ones of the tooth flanks of gears in which a gearlike workpiece which is to be worked is supported stationarily, however, rotatingly and is in a two flank meshing engagement with a toothlike tool. The tool carries out a rectilinear back-and-forth feed movement in a plane, which is parallel with respect to the workpiece axis, a plunge movement perpendicularly with respect to the workpiece axis and a swivelling movement about an axis which is directed transversely with respect to the feed direction. To produce crowned tooth flanks, the plunge feed and the swivelling movement of the tool is changed independently from one another in dependency of the respective position of the tool along the feed path. A rocking device is provided on which is arranged the tool and which also takes part in the back-and-forth feed movement and which furthermore can be driven pivotally about an axis which extends transversely with respect to the feed direction. Feed, plunge and swivelling movements are controlled corresponding with the pregiven flank line of the workpiece. An adjusting device is connected to the rocking device through a coupling member which is capable of accommodating a swivelling movement. The adjusting device includes a motor which drives a spindle, wherein the spindle cooperates with a spindle nut, to which is hingedly connected a coupling member which, in turn, is connected to the rocking device.

Method for producing crowned tooth flanks on a toothed workpiece, and a

A machine for the precision working of tooth surfaces on toothed workpieces. The machine has a frame, a rotatingly drivable gearlike tool which is arranged substantially above the workpiece on the frame and structure supporting the tool for movement into a tooth engaging relation with the workpiece. Structure is also provided for adjusting a crossed-axes angle between the tool and the workpiece. Guide structure is provided for effecting a change in the spacing between the geometric centers of the tool and the workpiece during a machining operation. The workpiece is stationarily mounted on the frame and all guideways on the frame required for facilitating an adjustment of the tool and during the working operation are arranged substantially above the workpiece. Additional structure is provided for facilitating an adjustment of the axis of rotation of the tool about both horizontal and vertical axes.

Machine for the precision working of tooth surfaces of toothed workpieces

A machine for precision working, for example shaving, of the tooth flanks of a toothed workpiece supported rotatably on a machine frame. A tool carrier carries a multi-toothed tool, for example a shaving cutter, and is supported substantially above the workpiece for rotative adjustment of the crossing of the axes of the workpiece and tool, about an axis perpendicular to the workpiece axis. The tool carrier is guided movably in a guide carrier and is driven for longitudinal feeding of the tool. The guide carrier is suspended swingably about a horizontal axis for spherical or conical tooth working. The guide carrier is supported pendantly from a swivel plate which is swingable and lockable about an axis perpendicular to the workpiece axis for adjusting the feed direction. The tool carrier is guided by a guide arm which is adjustable in its inclination and is securable by a pivot member on the swivel plate. Structure is provided for cancelling a portion of the feed movement of the tool toward the workpiece, and the guide arm comprises an inclined swivel guide bar which produces such feed movement of the tool toward the workpiece in response to longitudinal movement of the tool carrier.

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Munich, Germany

Heinrich R Fischer