US3885353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding machine
Assignee: Toyoda Koki KK
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Filing: 1973-10-29
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Granted: 1975-05-27
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Expires: 1993-10-29
Abstract
Abstract A grinding machine having a bed, workpiece supporting means, a wheel slide rotatably supporting a grinding wheel, a dresser for dressing the grinding wheel, and dresser feed means for feeding the dresser toward the grinding wheel by a predetermined dressing amount whenever a dressing operation is requested includes original position determination means having shiftable means supported on the wheel slide and movable together with the same, drive means serving to move the shiftable means by an amount corresponding to the predetermined dressing amount in a direction of retraction of the wheel slide whenever the dressing operation on the grinding wheel is performed, and means for detecting an original position of the wheel slide in co-operation with the shiftable means and generating a signal serving to stop the movement of the wheel slide, whereby the wheel slide can be accurately positioned at the original position thereof which must be varied in accordance with a reduction of the grinding wheel by dressing operations thereon.
Inventors
- 👤 Hiroshi Ota
- 👤 Tetsuo Matsuzaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:56
CPC Classifications
B; B24; B24B; B24B49/00; B24B49/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
317 words
A grinding machine comprising: a bed; workpiece supporting means mounted on said bed; a wheel slide slidably mounted on said bed and rotatably supporting a grinding wheel driven by a motor thereon; a hydraulic cylinder provided on said bed and serving to rapidly move said wheel slide toward and away from a workpiece on said workpiece supporting means; a stepping motor mounted on said bed and serving to feed said wheel slide toward and away from the workpiece for grinding the same; dressing means mounted on said wheel slide and being movable toward and away from said grinding wheel for dressing the same; first feed means mounted on said wheel slide for feeding said dressing means toward said grinding wheel by a predetermined dressing amount whenever a dressing operation on said grinding wheel is performed; second feed means mounted on said wheel slide for actuating said dressing means so as to perform a dressing operation on said grinding wheel; said stepping motor further serving to move said wheel slide toward the workpiece by a distance correspondiNg to said predetermined dressing amount whenever the dressing operation is performed; and original position determination means, having shiftable means slidably supported on said wheel slide, drive means connected to said first feed means for shifting said shiftable means by a distance corresponding to said predetermined dressing amount in a direction of retraction of said wheel slide whenever the dressing operation is performed, and detecting means mounted on said bed for detecting an original retracted position of said wheel side in cooperation with said shiftable means and generating a signal for serving to stop the retraction movement of said wheel slide when said wheel slide is retracted from said workpiece, whereby said wheel slide can be accurately positioned at the original retracted position thereof which must be varied in accordance with a reduction of said grinding wheel caused by dressing operations thereon.
Claim 2
Dependent Claim
317 words
A grinding machine comprising: a bed; workpiece supporting means mounted on said bed; a wheel slide slidably mounted on said bed and rotatably supporting a grinding wheel driven by a motor thereon; a hydraulic cylinder provided on said bed and serving to rapidly move said wheel slide toward and away from a workpiece on said workpiece supporting means; a stepping motor mounted on said bed and serving to feed said wheel slide toward and away from the workpiece for grinding the same; dressing means mounted on said wheel slide and being movable toward and away from said grinding wheel for dressing the same; first feed means mounted on said wheel slide for feeding said dressing means toward said grinding wheel by a predetermined dressing amount whenever a dressing operation on said grinding wheel is performed; second feed means mounted on said wheel slide for actuating said dressing means so as to perform a dressing operation on said grinding wheel; said stepping motor further serving to move said wheel slide toward the workpiece by a distance correspondiNg to said predetermined dressing amount whenever the dressing operation is performed; and original position determination means, having shiftable means slidably supported on said wheel slide, drive means connected to said first feed means for shifting said shiftable means by a distance corresponding to said predetermined dressing amount in a direction of retraction of said wheel slide whenever the dressing operation is performed, and detecting means mounted on said bed for detecting an original retracted position of said wheel side in cooperation with said shiftable means and generating a signal for serving to stop the retraction movement of said wheel slide when said wheel slide is retracted from said workpiece, whereby said wheel slide can be accurately positioned at the original retracted position thereof which must be varied in accordance with a reduction of said grinding wheel caused by dressing operations thereon.
Claim 3
Dependent Claim
25 words
A grinding machine according to claim 1, further comprising switching means for selectively utilizing said signal serving to stop the movement of said wheel slide.
Claim 4
Dependent Claim
81 words
A grinding machine according to claim 1, wherein said shiftable means comprises a shaft which is driven by said drive means connected to said first feed means in a direction of the retraction of said wheel slide by a distance corresponding to said predetermined dressing amount whenever the dressing operation is performed, and a dog member adjustably mounted on one end of said shaft, said dog member co-operating with said detecting means for determining said original position of said wheel slide.
Claim 5
Dependent Claim
35 words
A grinding machine according to claim 1, wherein said first feed means comprises an intermittent motion mechanism for feeding said dressing means toward said grinding wheel by said predetermined dressing amount in each dressing operation.
Claim 6
Dependent Claim
54 words
A grinding machine according to claim 1, wherein said detecting means comprises first and second switches for respectively generating a signal serving to reduce the speed of said wheel slide and a stopping signal serving to stop said wheel slide, when the same reaches the original position thereof, in co-operation with said shiftable means.
Claim 7
Dependent Claim
27 words
A grinding machine according to claim 1, further comprising second detecting means for detecting an advancing end of said wheel slide in cooperation with said shiftable means.
Claim 8
Dependent Claim
53 words
A grinding machine according to claim 3, wherein said detecting means comprises a box mounted on said bed, a lever pivotally mounted on said box and being swingable by an engagement of the same with said dog member, and a detector fixedly mounted on said box and having a sensor contacting said lever.
Claim 9
Dependent Claim
24 words
A grinding machine according to claim 7, further comprising an adjustable member provided between said lever and said sensor for adjusting the distance therebetween.
Claim 10
Dependent Claim
102 words
A grinding machine according to claim 1, wherein said first feed means comprises an intermittent infeed mechanism, a worm connected to said intermittent infeed mechanism, a first worm wheel engaged with said worm, a first screw connected to said first worm wheel for feeding said dressing means in accordance with rotation of said first worm wheel, and said drive means comprises a second worm wheel engaged with said worm and second screw connected to and rotated by said second worm wheel, said second screw being engaged with said shiftable means for shifting the same in accordance with rotation of said feed screw.
Claim 11
Dependent Claim
18 words
A grinding machine according to claim 9, wherein said first and second worm wheels have the same diameter.
Claim 12
Dependent Claim
18 words
A grinding machine according to claim 10, wherein said first and second screws have the same thread pitch.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |