Attachment for dust collection for cutting machining, dust collecting duct for machine tools, tool holder for machine tools, and machine tool

1. An attachment for dust collection for cutting machining, comprising:

a rotation mechanism; and a dust collection enclosure, rotatably configured by being fixed to the rotation mechanism, for enclosing at least part of a tool, wherein a gap for checking a machining state is provided in the dust collection enclosure, and the dust collection enclosure has a shape such that the gap faces a travel direction side of the tool, due to the dust collection enclosure rotating together with the rotation mechanism, by a frictional force between a workpiece and the dust collection enclosure, when the dust collection enclosure contacts a top face of the workpiece during a feeding operation.

2. The attachment for dust collection for cutting machining according to claim 1 , wherein the dust collection enclosure has

a first portion on a rotation mechanism side, having a first strength, and

a second portion that constitutes a workpiece side, having a second strength smaller than the first strength.

3. The attachment for dust collection for cutting machining according to claim 1 , wherein a shield member is provided for preventing intrusion of chips into a gap of a bearing that is used as the rotation mechanism.

4. The attachment for dust collection for cutting machining according to claim 1 , wherein the dust collection enclosure has a shape in which part of a side face of a tubular structure is cut, or a tubular shape of non-constant height.

5. The attachment for dust collection for cutting machining according to claim 1 , wherein the dust collection enclosure comprises a brush configuration.

6. A dust collecting duct device for machine tools, comprising:

the attachment for dust collection according to claim 1 ; and

a flow channel of air for dust collection that is coupled to the rotation mechanism of the attachment for dust collection.

7. A tool holder for machine tools, comprising:

the dust collecting duct device according to claim 6 ; and

a holder section, to which the dust collecting duct device is removably coupled, for holding a tool and for being attached to a rotating shaft of a machine tool.

8. The tool holder for machine tools according to claim 7 , wherein a dust collection port for discharge of chips out of the dust collecting duct device is provided in such a manner that a discharge direction of the chips is oriented perpendicularly to a central axis of the tool.

9. A machine tool device, comprising:

the dust collecting duct device according to claim 6 ; and

a driving mechanism, to which the dust collecting duct device is coupled, for relatively displacing a tool with respect to the workpiece while rotating the tool.

10. The machine tool device according to claim 9 further comprising the tool.

11. The machine tool device of claim 10 further comprising a power source for tool rotation that is independent of rotation of the dust collection enclosure with the rotation mechanism.

12. An attachment device for machine tool generated dust collection, comprising:

a rotation mechanism; and

a dust collection enclosure, the dust collection enclosure being secured to the rotation mechanism for rotation with the rotation mechanism, said dust collection enclosure extending, for tool visibility, only partially about a circumference extending about the rotation mechanism and only partially about the tool, and said dust collection enclosure being flexible such that upon contact with a workpiece said dust collection enclosure rotates into a tool visibility position, wherein

the dust collection enclosure is configured to rotate together with the rotation mechanism, on account of a frictional force between a workpiece and the dust collection enclosure, when a feeding operation is given to the dust collection enclosure contacting with a top face of the workpiece, such that the dust collection enclosure will not extend about a travel direction side of the circumference of the tool during the feeding operation.

13. The attachment device of claim 12 wherein the rotation mechanism is a bearing assembly with a first portion configured for attachment with a flow duct of the machine tool and a second portion fixed to the dust collection enclosure.

14. The attachment device of claim 13 further comprising a shield that is secured to both said bearing assembly and said dust collection enclosure.