Chucks or sockets – With safety feature
Patent
1996-12-19
1998-10-06
Bishop, Steven C.
Chucks or sockets
With safety feature
192129A, 192135, 200 6158R, 279148, 279157, 408 4, 408710, B23B 2504
Patent
active
058165851
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a chuck element for machine tools with a rotating jaw chuck, in which clamping jaws of the jaw chuck are radially adjustable relative to an axis of rotation, and in which the clamping jaws are mounted displaceably in a bearer connected with a drive shaft, and in which engagement openings are arranged in the region of the bearer for the introduction of an adjusting element for the positioning of the clamping jaws.
Machine tools of this sort are used in a plurality of embodiments. For example, different embodiments are lathes or milling machines. Another embodiment is that of an engraving machine for printing cylinders for rotogravure. Before the beginning of the engraving, the print cylinder is clamped into the engraving machine. The clamping in of the print cylinder occurs in such a way that axis pieces of the print cylinder are held in adjustable jaw chucks. Normally, three clamping jaws are thereby used. This clamping ensures a secure seating of the print cylinder during engraving. Chuck devices of this sort are also used for fastening scanning cylinders.
However, the known machine tools comprise certain operating characteristics that do not guarantee all requirements for an optimal working safety. For the adjustment of the clamping jaws, it is necessary to introduce a suitable tool into the rotatably mounted part of the machine tool. If the machine tool is unintentionally switched on during the introduction of the tool or of the print cylinder, operator injury can result. Another problem is that with clamping jaws that protrude externally, sharp edges are exposed, which can cause injury if immediate contact with the hand of an operator takes place. This is likewise critical above all for rotating machine parts.
SUMMARY OF THE INVENTION
It is an object of the present invention to construct a machine tool of the type named above in such a way that operating safety is increased.
According to the invention, a chuck system is provided for machine tools. The chuck system has a rotating jaw chuck and clamping jaws of the jaw chuck which are radially adjustable relative to an axis of rotation. The clamping jaws are displaceably mounted in a bearer that is connected with a drive shaft. Engagement openings are arranged in a region of the bearer for introduction of an adjustment tool for positioning of the clamping jaws. The bearer is surrounded by a protective sheath that is displaceably guided in a direction of rotation. The protective sheath has two openings which in a handling position of the protective sheath are arranged congruent to the engagement openings and in an operating position of the protective sheath are arranged so as to be offset to the engagement openings. The protective sheath at least partially radially surrounds the clamping jaws
The invention is explained in more detail on the basis of FIGS. 1 to 4.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross-section through a bearer provided with a jaw chuck, the bearer being surrounded by a protective sheath;
FIG. 2 is a highly schematized top view of a bearer with jaw chuck, with a positioning of the clamping jaws that is altered in relation to FIG. 1;
FIG. 3 shows a cross-section according to the sectional line III--III in FIG. 2; and
FIG. 4 is a partial representation of a region of the circumference of the protective sheath.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows a cross-section through a bearer 1 that can be coupled with a drive shaft (not shown) of a drive motor via a connecting element 2. The bearer 1 thereby extends along an axis of rotation 3. In general, the drive shaft of the drive motor is oriented in the direction of the axis of rotation. However, it is also possible in principle to implement a different arrangement of the drive motor via a corresponding deflection gearing.
The bearer 1 comprises a jaw chuck 4 on its side facing away from the connecting element 2, which jaw chuck is formed of clamping jaws 5 arranged displaceably along jaw guides 6. A displacem
REFERENCES:
patent: 1454898 (1923-05-01), Lee
patent: 2578317 (1951-12-01), Pealer
patent: 2706544 (1955-04-01), Schuman
patent: 3761654 (1973-09-01), Davis
patent: 3814876 (1974-06-01), Biafore
patent: 4290717 (1981-09-01), Aslen
patent: 4563013 (1986-01-01), Hunger et al.
patent: 4655464 (1987-04-01), Manschitz et al.
The Principles and Techniques of Mechanical Guarding, Bulletin No. 197. U.S. Department of Labor, p. 39., Jul. 1959.
Bishop Steven C.
Linotype-Hell AG
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