US3874071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine tool with automatic tool changing device
Assignee: Toyoda Koki KK
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Filing: 1973-02-23
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Granted: 1975-04-01
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Expires: 1993-02-23
Abstract
Abstract A machine tool having an automatic tool changing device includes a tool magazine upon which a plurality of cutting tools, having recesses for engaging drive keys upon a drive spindle, are mounted, a spindle head mounting the drive spindle which can be rotationally stopped by a braking device, first detecting means which detects the angular position of the stopped drive spindle, second detecting means which detects the angular position of a tool to be used for a subsequent machining operation and which is supported upon an arm device, and control means which serves to rotate the tool upon the arm device in accordance with the differential between output signals of the first and second detecting means so as to attain the desired tool exchanging operation through engagement of the drive keys upon the drive spindle and the recesses upon the tool being exchanged and inserted within the drive spindle.
Inventors
- 👤 Sadamu Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:30
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/24; B23B31/26; B23Q; B23Q5/00; B23Q5/02; B23Q5/04; B23Q5/20; Y; Y10; Y10T; Y10T483/00; Y10T483/13; Y10T483/17; Y10T483/1733; Y10T483/1736; Y10T483/1743; Y10T483/1748; Y10T483/1752; Y10T483/1755; Y10T483/1757; Y10T483/176
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
363 words
A machine tool having an automatic tool changing device comprising: a bed; workpiece supporting means movably mounted upon said bed and moved by motor means; a column mounted upon said bed for slidably supporting spindle head means, said spindle head means rotatably supporting a drive spindle having first engagement means including one of a key means and a recess means for driving a tool holder carrying cutting tool means mounted upon said drive spindle; tool magazine means mounted upon said column for supporting a plurality of said tool holders securely holding said cutting tool means and means for indexing said magazine to position a preselected one of said tool holders and said cutting tool means thereon to a predetermined position when a tool changing operation is to be performed, said tool holders respectively having second engagement means including the other of said key means and recess means being engagEable with said first engagement means upon said drive spindle; arm means for removing and replacing said holder carrying said cutting tool means from said tool magazine; primary arm means for exchanging said holder carrying said cutting tool means upon said arm means for said holder carrying said cutting tool means within said drive spindle; first detecting means connected with said drive spindle for detecting a first angular position of said first engagement means upon said drive spindle; second detecting means for detecting a second angular position of said second engagement means upon said tool holder while held upon said arm means; first control means, responsive to the outputs of said first and second detecting means, serving to generate an output signal corresponding to the differential between said first angular position and said second angular position; and second control means for rotating one of said drive spindle and said tool holder held by said arm means that is to be exchanged for a tool holder mounted on said drive spindle, responsive to said output signal of said first control means so as to prealign said first and second angular positions, whereby when said primary arm means interchanges said tool holder from said arm means to said spindle said first and second engagement means are coincident.
Claim 2
Dependent Claim
363 words
A machine tool having an automatic tool changing device comprising: a bed; workpiece supporting means movably mounted upon said bed and moved by motor means; a column mounted upon said bed for slidably supporting spindle head means, said spindle head means rotatably supporting a drive spindle having first engagement means including one of a key means and a recess means for driving a tool holder carrying cutting tool means mounted upon said drive spindle; tool magazine means mounted upon said column for supporting a plurality of said tool holders securely holding said cutting tool means and means for indexing said magazine to position a preselected one of said tool holders and said cutting tool means thereon to a predetermined position when a tool changing operation is to be performed, said tool holders respectively having second engagement means including the other of said key means and recess means being engagEable with said first engagement means upon said drive spindle; arm means for removing and replacing said holder carrying said cutting tool means from said tool magazine; primary arm means for exchanging said holder carrying said cutting tool means upon said arm means for said holder carrying said cutting tool means within said drive spindle; first detecting means connected with said drive spindle for detecting a first angular position of said first engagement means upon said drive spindle; second detecting means for detecting a second angular position of said second engagement means upon said tool holder while held upon said arm means; first control means, responsive to the outputs of said first and second detecting means, serving to generate an output signal corresponding to the differential between said first angular position and said second angular position; and second control means for rotating one of said drive spindle and said tool holder held by said arm means that is to be exchanged for a tool holder mounted on said drive spindle, responsive to said output signal of said first control means so as to prealign said first and second angular positions, whereby when said primary arm means interchanges said tool holder from said arm means to said spindle said first and second engagement means are coincident.
Claim 3
Dependent Claim
90 words
A machine tool as set forth in claim 1, wherein said arm means comprises an arm, actuating means connected with said arm for rotating and moving said arm in a direction parallel to the axis of said cutting tool means mounted upon said tool magazine, a socket rotatably mounted upon said arm and removably holding said tool holder, and a plunger provided upon said socket which is movable in an axial direction of said socket for engaging with said second engagement means upon said tool holder placed within said socket.
Claim 4
Dependent Claim
49 words
A machine tool as set forth in claim 2, wherein said second control means is a servo-motor mounted upon said arm for rotating said socket, and said second detecting means detects the angular position of said socket wherein said angular position of said socket defines said second angular position.
Claim 5
Dependent Claim
46 words
A machine tool as set forth in claim 3, wherein said second control means includes a power source and switching means for selectively supplying an electrical power output of said power source to said servo-motor so as to rotate said control means at a constant speed.
Claim 6
Dependent Claim
18 words
A machine tool as set forth in claim 4, wherein said first and second detecting means are synchro-generators.
References Cited (Backward Citations)
US3691655A
Cited
US3791022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |