Boots – shoes – and leggings
Patent
1990-12-20
1993-11-30
Smith, Jerry
Boots, shoes, and leggings
36416701, 36447411, 318625, 318595, G05B 1302, G05B 1132, G05B 1118
Patent
active
052671429
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a spindle rotation control method applied to a machine having two spindles, and more particularly, to a spindle rotation control method for driving the spindles at the same rotational speed with the same rotational phase.
BACKGROUND ART
In a machine tool provided with two spindles, it is known to rotate the spindles at the same speed. For example, in a lathe of this kind, two spindles are rotated at the same speed when a shift is made from a state where one end of a workpiece is gripped by a first chuck coupled to one of the spindles, to a state where the other end of the workpiece is gripped by a second chuck coupled to the other spindle. When a workpiece having an anisotropic configuration with respect to the axis thereof is gripped by the second chuck, the workpiece can collide with the second chuck, if the rotational phases (rotational angle positions) of the chucks are different from each other, even though these chucks are rotated at the same speed. In this case, the workpiece can be damaged or deformed.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a spindle rotation control method capable of driving two spindles of a machine at the same rotational speed with the same rotational phase.
In order to achieve the above-described object, according to the present invention, there is provided a spindle rotation control method for performing speed control for first and second spindles of a machine such that the first and second spindles are rotated at the same rotational speed. The control method comprises the steps of (a) detecting rotational positions of the first and second spindles, (b) generating a one-revolution signal when each of the first and second spindles assumes a predetermined rotational position, (c) detecting first and second rotational quantities measured from those time points at which the one-revolution signals for the first and second spindles are respectively generated, when the first and second spindles are brought to be rotated at the same speed, and (d) reducing the rotational speeds of the first and second spindles in accordance with the first and second rotational quantities, respectively.
Preferably, this control method further includes a step (e) of performing speed control for the first and second spindles, after execution of the step (d), such that the first and second spindles are rotated at the same rotational speed again.
As described above, according to the present invention, speed control for the first and second spindles is performed so that both the spindles are rotated at the same rotational speed, and then the rotational speeds of these spindles are decreased in accordance with the first and second rotational quantities measured from the time points at which the one-revolution signals for the spindles are respectively generated. Accordingly, a deviation between rotational phases of the spindles can be eliminated. Preferably, after the rotational speeds of the first and second spindles are decreased so that the rotational phase deviation between the spindles is eliminated, speed control is performed again such that the spindles are rotated at the same speed. This makes it possible to rotate the spindles at the same rotational speed with the same rotational phase. Thus, in case, for example, that a shift is made from a state where a workpiece having an anisotropic configuration is gripped by a first chuck coupled to the first spindle of a lathe to a state where the workpiece is gripped by a second chuck coupled to the second spindle, by applying the spindle rotation control method of the present invention, collision of the workpiece with the second chuck can be positively prevented, whereby the workpiece can be prevented from being damaged and deformed.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a functional block circuit diagram showing a control unit for embodying a spindle rotation control method according to a first embodiment of the present invention, together with peripher
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Fukukura Masaaki
Kono Shinichi
Fanuc Ltd.
Smith Jerry
Trammell Jim
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