Claims
- 1. A traction drive tool adapter having a rotary portion provided at the front half section thereof with an axially extending central bore and fitted firmly at the rear half section thereof in a main shaft of a machine tool, a fixed portion consisting of a housing fitted rotatably around the outer circumferential surface of the front half section of said rotary portion and connected detachably to a fixed part of said machine tool, and a tool mount portion inserted in said central bore in said rotary portion, rotatable with respect to said fixed portion and said rotary portion and used to attach a tool to a front end section thereof, all of which three portions are put together via a planetary roller speed increasing mechanism, comprising a first revolution speed detecting means provided on said fixed portion and adapted to detect the number of revolutions per unit time of said rotary portion, a second revolution speed detecting means provided on said fixed portion and adapted to detect the number of revolutions per unit time of said tool mount portion, and an abnormal rotation judgement means which is connected to said first and second detecting means so that output signals from these detecting means are input thereinto, and which is adapted to generate an abnormality signal when a speed increasing ratio, i.e. a ratio of the number of revolutions per unit time of said tool mount portion to that of said rotary portion is lower than a predetermined level.
- 2. A traction drive tool adapter according to claim 1, wherein a rotor is provided at the outer circumferential part of a front half section of said rotary portion, a stator being provided in a hollow of said fixed portion so as to be opposed to said rotor, whereby a generator as a power source for said abnormal rotation judgement means is formed.
Parent Case Info
This is a continuation of application Ser. No. 07/928,413, filed Aug. 12, 1992, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (5)
Number |
Date |
Country |
46351 |
Feb 1990 |
JPX |
3-51568 |
Mar 1991 |
JPX |
3-213756 |
Sep 1991 |
JPX |
4-39450 |
Feb 1992 |
JPX |
8103554 |
Feb 1983 |
NLX |
Non-Patent Literature Citations (1)
Entry |
Abstract of Japanese Appln., pub. no. JP 62118799 May 11, 1992, vol. 011338. |
Continuations (1)
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Number |
Date |
Country |
Parent |
928413 |
Aug 1992 |
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