US3852920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine tool having rest apparatus
Assignee: Toyoda Koki KK
•
Filing: 1973-11-19
•
Granted: 1974-12-10
•
Expires: 1993-11-19
Abstract
Abstract A grinding machine having means to momentarily stop the in-feed movement of the grinder toward a rotably supported workpiece. The diameter of the workpiece is determined by a sizing device after the momentary stop of the tool and stored in a memory. Subsequently the engaging pieces of a work rest cause the workpiece to be deflected toward the tool for continued machining and both the tool and rest are subjected to synchronized advance when the output from the sizing device reaches a preselected value greater than the stored value in the memory.
Inventors
- 👤 M Takida
- 👤 T Ota
- 👤 I Suzuki
- 👤 M Osuga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:49
CPC Classifications
B; B24; B24B; B24B41/00; B24B41/06; B24B41/065; B23; B23Q; B23Q15/00; B23Q15/007; B23Q15/013; B23Q15/02; B24B47/00; B24B47/20; B24B47/206; G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/416; G05B19/4166; Y; Y10; Y10T; Y10T409/00; Y10T409/30; Y10T409/304536; Y10T409/305544; Y10T409/305656; Y10T409/305768
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
315 words
A machine tool having rest means comprising a bed; workpiece supporting means mounted on said bed; drive means for rotating a workpiece supported by said workpiece supporting means; tool slide means carrying at least one machining tool serving to machine the workpiece; first feed means for moving said tool slide means toward and away from the workpiece; rest apparatus located on the opposite side of the workpiece from the tool slide and having an engaging finger operative to support the workpiece during machining thereof; second feed means for moving said rest means toward and away from the workpiece; first control means for controlling said first and second feed means to move said tool slide means and said rest means toward and away from the workpiece; sizing device means for measuring a dimension of the workpiece and generating an output corresponding to the dimension of the workpiece; second control means for effecting a momentary stop of said tool slide means at a given moment in the course of a machining operation on the workpiece; third control means for controlling said second feed means so as to move said engaging means in a direction to the workpiece during said momentary stop through a predetermined stroke in cooperation with said sizing device means, whereby the workPiece is forcedly shifted toward said machining tool by said rest apparatus, said workpiece continuing to be machined while the tool slide means is at its momentary stop; and fourth control means for controlling a movement of said engaging finger in a direction to the workpiece synchronously with a movement of said tool slide means at a same speed with each other when said forcedly shifting movement of said engaging means and the workpiece has been completed by said third control means, whereby the machining operation on the workpiece can be performed with high accuracy independently of a wear of said engaging finger.
Claim 2
Dependent Claim
315 words
A machine tool having rest means comprising a bed; workpiece supporting means mounted on said bed; drive means for rotating a workpiece supported by said workpiece supporting means; tool slide means carrying at least one machining tool serving to machine the workpiece; first feed means for moving said tool slide means toward and away from the workpiece; rest apparatus located on the opposite side of the workpiece from the tool slide and having an engaging finger operative to support the workpiece during machining thereof; second feed means for moving said rest means toward and away from the workpiece; first control means for controlling said first and second feed means to move said tool slide means and said rest means toward and away from the workpiece; sizing device means for measuring a dimension of the workpiece and generating an output corresponding to the dimension of the workpiece; second control means for effecting a momentary stop of said tool slide means at a given moment in the course of a machining operation on the workpiece; third control means for controlling said second feed means so as to move said engaging means in a direction to the workpiece during said momentary stop through a predetermined stroke in cooperation with said sizing device means, whereby the workPiece is forcedly shifted toward said machining tool by said rest apparatus, said workpiece continuing to be machined while the tool slide means is at its momentary stop; and fourth control means for controlling a movement of said engaging finger in a direction to the workpiece synchronously with a movement of said tool slide means at a same speed with each other when said forcedly shifting movement of said engaging means and the workpiece has been completed by said third control means, whereby the machining operation on the workpiece can be performed with high accuracy independently of a wear of said engaging finger.
Claim 3
Dependent Claim
22 words
A machine tool according to claim 1 in which the forced shift of the workpiece is sufficient to cause a deflection thereof.
Claim 4
Dependent Claim
113 words
A machine tool according to claim 1 in which the first feed means includes a first hydraulic cylinder fixedly mounted on the body, a piston disposed within the first cylinder and having an axial bore extending therethrough, a feed screw extending through the bore in the piston, said feed screw being constrained from axial movement relative to the piston and being free to rotate with respect thereto, a nut depending from the tool slide and threadably engaging with one threaded end of the feed screw, a first gear secured to the other end of the feed screw, and a first stepping motor mounted on the bed and driving the first gear for rotation.
Claim 5
Dependent Claim
129 words
A machine tool according to claim 1 in which the second feed means includes a second hydraulic cylinder and a second stepping motor and wherein the rest means comprises a base secured to the bed, a body placed on the base, a slide rod receive in a bore within the body and carrying the engaging finger at its one end which extends externally of the bore and a threaded bore at its other end, and a threaded shaft rotatably journaled in the body, said threaded shaft carrying at its one end a threaded portion which threadably engages the threaded bore in the slide rod and carrying a second geat at its other end, said second stepping motor being mounted on the body for meshing engaging with the second gear.
Claim 6
Dependent Claim
30 words
A machine tool according to claim 1, further including a memory circuit for storing the output produced by the sizing means immediately after the momentary stop of the tool slide.
Claim 7
Dependent Claim
69 words
A machine tool according to claim 5 in which the fourth control means is operative to initiate the synchronized movement of the engaging finger and the tool slide toward each other when the difference between a varying output from the sizing means during the momentary stop of the tool slide means and the value stored immediately after the momentary stop of the tool slide means reaches a preset value.
Claim 8
Dependent Claim
45 words
A machine tool according to claim 3, further including a power supply for supplying a pulse train to the first stepping motor, and wherein the first control means includes a first gate connected in the path from the power supply to the first stepping motor.
Claim 9
Dependent Claim
45 words
A machine tool according to claim 4, further including a power supply for supplying a pulse train to the second stepping motor, and wherein the first control means includes a second gate connected in the path from the power supply to the second stepping motor.
Claim 10
Dependent Claim
63 words
A machine tool according to claim 7 in which the tool slide means is initially moved by a drive from the first hydraulic cylinder, followed by a drive from the first stepping motor, and wherein the drive from the first stepping motor is interrupted by the second control means which closes the first gate when the tool slide means reaches a given position.
Claim 11
Dependent Claim
120 words
A machine tool according to claim 8 in which the sizing means is carried by the rest means, and the rest means is moved by a drive from the second hydraulic cylinder until the sizing means is in a position to measure the diameter of the workpiece, said movement of the rest means being initiated in response to the momentary stop of the tool slide means, said rest means being further moved in a direction to deflect the workpIece toward the tool slide means under the control of the third control means enabling the second gate to feed the pulse train to the second stepping motor, the further movement of the rest means being interrupted by the fourth control means.
References Cited (Backward Citations)
US2638719A
Cited
US3153884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |