Table feed apparatus
AssigneeSeiko Seiki Kabushiki Kaisha
InventorsTetsuya Nagata, Osamu Ohashi
Life of this patent
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Abstract
A grinder wheel table feed apparatus which converts a rotation of the table driving motor into a reciprocation movement of the grinder wheel table through a ball-screw mechanism and exerts a traverse movement to the table between a stand-by position and a working position. Additionally, a device of the invention converts a rotation of a reciprocation axle drive motor into a reciprocal movement of said table through an eccentric cam, and it also exerts an oscillation operation to the table in its working position. A drive control means of said eccentric cam is comprised of an encoder operable to read a rotation position of the reciprocal axle drive motor and to control same through a control device so as to be effective to stop the eccentric cam at a predetermined angle.
Claims12
A table feed apparatus of the type which converts rotation of a table drive motor into reciprocal movement of a grinder wheel table through a ball-screw assembly to thereby impart a traverse movement to said grinder wheel table between a non-working position and a working position and converts rotation of a reciprocation axle drive motor into reciprocal movement of said table through an eccentric cam to thereby impart an oscillation movement to said grinder wheel table when the table is in the working position;
- characterized in that a drive control means of said eccentric cam comprises an encoder for effecting reading of a rotation position of said reciprocation axle drive motor, and a control device for controlling the rotational drive of said reciprocation axle drive motor so as to be effective to stop the eccentric cam at a predetermined angle.
A grinder wheel table control apparatus comprising a grinder wheel table reciprocally mounted on a table base and controlled for reciprocation by a servo-motor, an encoder, and a ball-screw and nut arrangement, said ball-screw and nut arrangement being fixedly attached to a cam assembly comprising a slide-ring, a cam block, a reciprocation axle extending from a reciprocation axle drive motor, a second encoder mounted beneath said reciprocation axle drive motor, said cam axle extending from an upper end of said reciprocation axle and eccentric thereto, a cam plate journaled for rotation in said cam block, and an adjustment plate provided with a pair of elongated adjusting holes mounted on said cam plate, said second encoder operable to read a rotation position of said reciprocation axle drive motor and to report said position to control device means for controlling the rotational drive of said reciprocation axle drive motor effecting a stop of said cam plate at a predetermined angle.
A table feed apparatus comprising:
- a table mounted to undergo sliding movement between a stand-by position and a working position;
- first drive means for driving the table between the stand-by and working positions;
- second drive means for reciprocatingly driving the table while the table is in the working position, the second drive means comprising a controllable rotary motor for producing a rotary output about a given axis of rotation, an eccentric cam, means mounting the eccentric cam for rotational eccentric movement about the given axis of rotation, means for converting the rotational eccentric movement of the eccentric cam into reciprocating movement of the table;
- and control means for controlling the operation of the rotary motor to stop the rotation thereof after a preselected number of reciprocating movements of the table, the control means including means for stopping the rotation of the rotary motor such that the eccentric cam stops its rotational eccentric movement at a predetermined angular position.
Dependencies are inferred from the claim text.