US3685111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-spindle automatic bar machine
Assignee: Seiko Seiki KK
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Filing: 1969-12-08
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Granted: 1972-08-22
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Expires: 1989-12-08
Abstract
Abstract A multiple-spindle bar machine has a rotatable and indexable drum with tool carriers and drives at each position. The bar machine is particularly suitable for the high precision production of long parts of small diameter in that it is fitted with a moving support which fits around the workpiece and is maintained at a constant distance from the corresponding bit thereby minimizing deflection of the workpiece, and because it is also fitted with locating pins and stops in both radial and circumferential directions. The bar machine also provides for cutting of gears with high precision.
Inventors
- 👤 Kenji Nemoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:06
CPC Classifications
B; B23; B23B; B23B9/00; B23B9/02; Y; Y10; Y10T; Y10T29/00; Y10T29/51; Y10T29/5104; Y10T29/5109; Y10T29/5114; Y10T29/5124; Y10T29/5125; Y10T29/5126; Y10T82/00; Y10T82/25; Y10T82/2524
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
258 words
A multi-spindle automatic bar machine comprising an indexible spindle drum a plurality of rotatable work spindles spaced at equal intervals along a common circle in said spindle drum, said circle being coaxial with same, said spindles when said drum is at rest being at fixed spindle positions, a plurality of tool carriers equal in number to the number of work spindles, each of said tool carriers being located at a position suitable for coacting with a spindle at a spindle position, said tool carriers being swingably mounted on said machine and being slidable both parallel to and radially to the corresponding spindle axis when in a spindle position, cutting tools mounted on a plurality of said tool carriers, each of said tool carriers being movable relative to the corresponding spindle to bring a tool into and out of overlapping relationship with a workpiece on a corresponding spindle simultaneously, each of said workpieces being transferable on its corresponding spindle to a successive tool carrier position by indexed rotation of said drum, a plurality of guide bushing carriers, each supporting a guide bushing having an end face and each corresponding to a spindle, said bushings being slidable parallel to said drum axis and said spindle axes, and serving to prevent deflection of said workpiece by said tool, and means connected to each tool carrier to move the corresponding guide bushing in an axial direction and maintain a constant axial distance between an end face of said bushing and the cutting point of a tool mounted on the corresponding tool carrier.
Claim 2
Dependent Claim
258 words
A multi-spindle automatic bar machine comprising an indexible spindle drum a plurality of rotatable work spindles spaced at equal intervals along a common circle in said spindle drum, said circle being coaxial with same, said spindles when said drum is at rest being at fixed spindle positions, a plurality of tool carriers equal in number to the number of work spindles, each of said tool carriers being located at a position suitable for coacting with a spindle at a spindle position, said tool carriers being swingably mounted on said machine and being slidable both parallel to and radially to the corresponding spindle axis when in a spindle position, cutting tools mounted on a plurality of said tool carriers, each of said tool carriers being movable relative to the corresponding spindle to bring a tool into and out of overlapping relationship with a workpiece on a corresponding spindle simultaneously, each of said workpieces being transferable on its corresponding spindle to a successive tool carrier position by indexed rotation of said drum, a plurality of guide bushing carriers, each supporting a guide bushing having an end face and each corresponding to a spindle, said bushings being slidable parallel to said drum axis and said spindle axes, and serving to prevent deflection of said workpiece by said tool, and means connected to each tool carrier to move the corresponding guide bushing in an axial direction and maintain a constant axial distance between an end face of said bushing and the cutting point of a tool mounted on the corresponding tool carrier.
Claim 3
Dependent Claim
114 words
The multi-spindle automatic bar mAchine as defined in claim 1, further comprising a first location pin on each tool carrier, corresponding first location stop means secured on each corresponding guide bushing, means engaging said first location pins and corresponding first stop means by radial movement of each of said tool carriers for the elimination of indexing error in the radial direction, a second location pin on each of said tool carriers, corresponding second location stop means secured on each corresponding guide bushing carrier and means engaging said second pin and second stop means by swinging movement of said tool carrier for the elimination of circumferential error in the indexing of said drum and spindles.
Claim 4
Dependent Claim
51 words
A multi-spindle automatic bar machine claimed in claim 1, providing, for manufacturing pinions, at least a hob-cutting attachment at one station of the machine and a means for mechanically transmitting a synchronized rotation to the work spindle of the station from the hob-driving motor with a definite rate for the hobbing.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |