Abstract: In a carriage drawing machine for uniformly drawing elongated material to drawn, having two drawing carriages reciprocatingly displaceable in mutually opposite directions, a drawing jaw vise on each carriage for alternately gripping the material to be drawn, each of the vises having two drawing jaws held in a housing by a wedge structure with bearing rollers interposed which serves to self-lock during the drawing, both of said drawing jaw vises being disposed to receive and simultaneously draw two bars of the material to be drawn, at least one of the two drawing jaws being engageable in common with both of the bars, and including an equalizing support in association with the other of the two drawing jaws.
Type:
Grant
Filed:
August 29, 1977
Date of Patent:
September 12, 1978
Assignee:
Schumag Schumacher Metallwerke Gesellschaft mit beschrankter Haftung
Abstract: Method of grinding elongated, cylindrical workpieces in continuous operat in a grinding machine wherein the workpieces are advanced while they are rotated about their longitudinal axes includes exerting an oscillating grinding pressure transversely to the longitudinal axis of the workpiece, and adjusting the frequency of the oscillations to lie substantially in low-to-medium frequency range, outside the frequency ranges of resonant vibrations of parts of the workpiece and of the grinding machine; and device for carrying out the foregoing method.
Type:
Grant
Filed:
August 11, 1976
Date of Patent:
December 20, 1977
Assignee:
SCHUMAG Schumacher Metallwerke Gesellschaft mit beschrankter Haftung
Abstract: Method of controlling with heightened accuracy a processing machine driven t different operating speeds and having a machine part moving through a predetermined full range, the processing machine, at an initial setting of the moving machine part, within a given tolerance range, repeatedly permitting start-up of a processing cycle that has been instituted in advance through a precontrolled time period dependent upon the operating speed and which includes a control commencement build-up time period and a full range displacement time period, which includes interposing a blocking time period between the control commencement build-up time period and the full range displacement time period, the blocking time period always ending at the same position in the displacement range of the moving machine part, blocking the full range displacement by the moving machine part until the end of the blocking time period, and advancing the start of the control commencement build-up time period in accordance with the blocking time
Type:
Grant
Filed:
November 3, 1975
Date of Patent:
December 28, 1976
Assignee:
Schumag Schumacher Metallwerke Gesellschaft mit beschrankter Haftung
Inventors:
Walter Wetzels, Johann Greven, Wilhelm Romer, Heinz Hoppe
Abstract: Method of controlling with heightened accuracy a processing machine driven t different operating speeds and having a machine part moving through a predetermined full range, the processing machine, at an initial setting of the moving machine part, within a given tolerance range, repeatedly permitting start-up of a processing cycle that has been instituted in advance through a precontrolled time period dependent upon the operating speed and which includes a control commencement build-up time period and a full range displacement time period, which includes interposing a blocking time period between the control commencement build-up time period and the full range displacement time period, the blocking time period always ending at the same position in the displacement range of the moving machine part, blocking the full range displacement by the moving machine part until the end of the blocking time period, and advancing the start of the control commencement build-up time period in accordance with the blocking time
Type:
Grant
Filed:
April 30, 1974
Date of Patent:
March 16, 1976
Assignee:
Schumag Schumacher Metallwerke Gesellschaft mit beschrankter Haftung
Inventors:
Walter Wetzels, Johann Greven, Wilhelm Romer, Heinz Hoppe