Thread cutting machine
First Claim
Patent Images
1. A thread cutting machine, comprising:
- a workpiece supporting stand having a surface for holding a workpiece;
a spindle head movably supported with respect to said workpiece supporting stand;
means to move said spindle head in opposite directions towards and away from said workpiece holding surface;
a rotatable spindle for holding a thread cutting tool, said spindle being rotatably supported by said spindle head; and
means for rotating said spindle;
first and second means operable to control the position of said thread cutting tool;
said first means being responsive to said spindle head moving means to generate a signal corresponding to the movement of said spindle head; and
said second means for rotating said spindle in accordance with said signal to synchronize the amount of movement per revolution of said spindle with the movement of said spindle head relative to said workpiece holding surface.
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Accused Products
Abstract
A thread cutting machine where the rate of advance of the thread cutting tool is controlled by means of a control system whereby the rotation of the tool and its rate of advance toward the workpiece are both used to control the position of the cutting tool.
32 Citations
7 Claims
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1. A thread cutting machine, comprising:
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a workpiece supporting stand having a surface for holding a workpiece;
a spindle head movably supported with respect to said workpiece supporting stand;
means to move said spindle head in opposite directions towards and away from said workpiece holding surface;
a rotatable spindle for holding a thread cutting tool, said spindle being rotatably supported by said spindle head; and
means for rotating said spindle;first and second means operable to control the position of said thread cutting tool; said first means being responsive to said spindle head moving means to generate a signal corresponding to the movement of said spindle head; and said second means for rotating said spindle in accordance with said signal to synchronize the amount of movement per revolution of said spindle with the movement of said spindle head relative to said workpiece holding surface. - View Dependent Claims (2)
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3. A thread cutting machine, comprising:
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a workpiece supporting stand having a surface for holding a workpiece;
a spindle head movably supported with respect to said workpiece supporting stand;
means to move said spindle head in opposite directions towards and away from said workpiece holding surface;
a rotatable spindle for holding a thread cutting tool, said spindle being rotatably supported by said spindle head;
means for rotating said spindle;means for generating an instruction signal corresponding to a selected speed of rotation of a thread cutting tool held by said spindle; first position detecting means, connected to said spindle head moving means, for generating a first signal corresponding to the movement of said spindle head;
means for controlling said spindle head moving means in accordance with said first signal and said instruction signal;second position detecting means, connected to said spindle rotating means, for generating a second signal corresponding to the rotational angle of a selected thread cutting tool held by said spindle;
means for controlling said spindle rotating means in accordance with said first signal and said second signal. - View Dependent Claims (4)
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5. A thread cutting machine, comprising:
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a workpiece supporting stand for supporting at least one workpiece, said work piece supporting stand having a surface for holding said workpiece, a column arranged vertically on one side of said workpiece supporting stand by said column, a spindle head movable supported with respect to said workpiece supporting stand by said column, a plurality of spindles rotatably supported by said spindle head, the axes of said spindles disposed parallel each other, a thread-cutting tool detachably coupled to the lower end portion of each of said spindles, means to rotate each of said spindles, moving means to move said spindle head in opposite directions toward and away from said workpiece holding surface; and means to control said rotating means governed by said moving means.
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6. A thread cutting machine, comprising:
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a workpiece supporting stand having a surface for holding a workpiece; a spindle head movably supported with respect to said workpiece supporting stand; a first AC servo motor to move said spindle head in opposite directions toward and away from said workpiece holding surface; a rotatable spindle for holding a thread cutting tool, said spindle being rotatably supported by said spindle head; a second AC servo motor to rotate said spindle; first and second means operable to control the position of said thread cutting tool; said first means responsive to said first AC servo motor to generate a signal corresponding to the movement of said spindle head; and said second means for rotating said spindle in accordance with said signal to synchronize the amount of movement per revolution of said spindle with the movement of said spindle head relative to said workpiece holding surface.
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7. A thread cutting machine, comprising:
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a workpiece supporting stand for supporting at least one workpiece, said workpiece supporting stand having a surface for holding said workpiece; a column and a threaded shaft arranged vertically on one side of said workpiece supporting stand; a spindle head movably supported with respect to said workpiece supporting stand by said column and said threaded shaft; a spindle rotatably supported by said spindle head; a thread cutting tool detachably coupled to the lower end portion of said spindle; a first AC servo motor to rotate said spindle; a second AC servo motor to move said spindle head in opposite directions toward and away from said workpiece holding surface, said second AC servo motor directly coupled to said threaded shaft; and means to control said first AC servo motor governed by said second AC servo motor.
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Specification