JP2002144120A - Working apparatus for manual operation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working apparatus for manual operation, capable of preventing a work from being flipped and restraining generation of heat in working with a grip of the tip part of a flexible shaft gripped by one hand and with the work gripped by the other hand. SOLUTION: In this working apparatus for manual operation 1 having a rotary working tool 9 at the tip part of the flexible shaft 7 for manual operation, the base end part of an inner shaft in the flexible shaft 7 is connected and interlocked with an output shaft 29 to freely rotate around the axis of the shaft itself and freely rotate with eccentricity with the minimum radius of the shaft center, and the length of the flexible shaft 7 is set so that vibration produced by the minimum eccentric rotation applied to the base end part of the flexible shaft 7 is enough transmitted to the tip part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining apparatus for manual operation, in which a rotary working tool such as a rotary cutting tool, a brush, a grindstone or the like is detachably mounted on a distal end of a flexible shaft having a grip on the distal end side. More particularly, the present invention relates to a manual processing device that generates less relative bouncing between a workpiece and a rotary processing tool during processing of a workpiece and generates less heat during processing.

[0002]

2. Description of the Related Art In a conventional manual processing apparatus of this kind, a base end of an inner shaft of a flexible shaft is integrally connected to a front end of an output shaft rotated by a motor, and a front end of the inner shaft is connected to the flexible shaft. In this configuration, a rotary processing tool such as a brush or a grindstone is attached to the section. When the work is processed, the operator holds the grip provided at the distal end of the outer tube of the flexible shaft, and brings the rotary processing tool into contact with the processed portion of the work to perform the processing.

[0003]

In the conventional structure as described above, for example, a worker holds a work in one hand and holds the grip of the outer tube on the flexible shaft with the other hand, and rotates the work. When a rotating tool is brought into contact with the workpiece, the rotating tool is rotated relatively to the workpiece due to the reaction force of the resistance that increases rapidly when the rotating tool contacts the workpiece while rotating. They tend to move and bounce. In this case, when the holding of the rotary working tool is strong, the work tends to be jumped off by the rotation of the rotary working tool.

Therefore, it is necessary to hold the work and the grip relatively firmly, and there is a problem that fatigue is likely to occur. Further, when the work is processed while firmly holding the work and the grip, the work and the rotary processing tool generate heat due to resistance during the processing, making it difficult to hold the work and shortening the life of the rotary processing tool. There is.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and is directed to a manual processing apparatus provided with a rotary processing tool at a distal end of a manual flexible shaft. The base end of the inner shaft of the flexible shaft is linked to an output shaft that is rotatable around its own axis and that is eccentrically rotatable with a small radius.

According to a second aspect of the present invention, in the manual working device according to the first aspect, the length of the flexible shaft is such that the deflection caused by the minute eccentric rotation imparted to the base end of the flexible shaft is at the tip end. It is set to the length transmitted to.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a manual processing apparatus 1 according to an embodiment of the present invention
And a flexible shaft 7 whose base end is connected to the output shaft 5 of the rotary drive device 3. The distal end of the flexible shaft 7 has an appropriate rotation such as a rotary cutting tool, a grindstone, a brush, or the like. A processing tool 9 is attached.

As shown in FIG. 2, the rotary drive device 3 includes a support block 11, and an input shaft 15 is rotatably supported on the support block 11 via a plurality of bearings 13. The input shaft 15 is appropriately linked to a drive motor (not shown), and a drive pulley 17 having an appropriate diameter is attached to one end of the input shaft 15.

An eccentric collar 23 is rotatably supported via a plurality of bearings 21 on a cylindrical bearing housing 19 mounted on the support block 11 via a plurality of bolts (not shown). The axis of the eccentric collar 23 coincides with the axis of the input shaft 15. However, the axis of the eccentric hole 25 provided in the eccentric collar 23 is slightly eccentric with respect to the axis of the eccentric collar 23. Therefore, when the eccentric collar 23 is rotated, the axis of the eccentric hole 25 is aligned with the eccentric collar 2.
An eccentric rotation (oscillating rotation of a small radius) with a small amount of eccentricity with respect to the axis 3 is performed.

An output shaft 29 is rotatably supported in an eccentric hole 25 of the eccentric collar 23 via a plurality of bearings 27. The output shaft 29 is connected to the input shaft 15 and the output shaft 29 (same as the output shaft 5). Between the input shaft 15 and the output shaft 29, an appropriate universal joint mechanism 31 is interposed to transmit the rotation.
Therefore, the rotation of the input shaft 15 is directly transmitted to the output shaft 29 via the universal joint mechanism 31.

An appropriate chuck mechanism 33 such as a collet chuck or a scroll chuck is provided at the tip of the output shaft 29.
The base end of the flexible shaft 7 is detachably held and connected.

In order to rotate the eccentric collar 23 in conjunction with the rotation of the input shaft 15, an intermediate shaft 35 is rotatably supported by the support block 11, and is provided at one end of the intermediate shaft 35. Intermediate pulley 37 and the input shaft 15
A belt 39 having an "8" shape twisted is wound around the driving pulley 17 provided in the first direction so that the intermediate pulley 37 rotates in the reverse direction with respect to the driving pulley 17. A belt 45 extends between a large-diameter intermediate pulley 41 provided on the other end of the intermediate shaft 35 and a small-diameter driven pulley 43 provided on the eccentric collar 23.

Therefore, the input shaft 1 is driven by the drive motor.
5, the drive pulley 17, the intermediate pulleys 37, 4
The eccentric collar 23 is rotated at an increased speed in the direction opposite to the rotation direction of the input shaft 15 via the first and driven pulleys 43 and the like. Further, since the rotation of the input shaft 15 is transmitted to the output shaft 29 via the universal joint mechanism 31, the output shaft 29
Rotates in the same direction as the rotation direction of the input shaft 15, and
The rotation of the eccentric collar 23 revolves in the opposite direction with a small radius.

The flexible shaft 7 has a structure in which an inner shaft (not shown) is rotatably provided in an outer tube 47. The inner end 49 and the grip 51 at the distal end of the outer tube 47 are provided inside the inner tube 47. The rotating shaft 53 provided at the end of the shaft is a bearing (not shown).
The rotatable shaft 53 on the base end 49 side is detachably held by the chuck mechanism 33. A tool chuck 55 such as a collet chuck for holding the rotary processing tool 9 in a detachable manner is attached to a rotary shaft (not shown) on the distal end side.

In the above construction, when the input shaft 15 is rotated by the drive motor, the output shaft 29 is rotated and the inner shaft of the flexible shaft 7 is rotated in conjunction with the rotation, so that the rotary working tool held by the tool chuck 55 is rotated. 9 will also be rotated. As described above, when the rotary processing tool 9 is being rotated, the grip 51 at the distal end of the flexible shaft 7 is appropriately held to process the rotating rotary processing tool 9 into a work (not shown). By touching the position, processing of the work is performed.

The output shaft 29 revolves around its own axis and eccentrically rotates (revolves) with a small radius due to the rotation of the eccentric collar 23. The rotation and revolving of the output shaft 29 are performed by a flexible shaft. 7 is transmitted. That is, the base end 49 of the outer tube 47 of the flexible shaft 7 revolves according to the revolution of the output shaft 29,
In addition, the base end side of the inner shaft rotates and revolves according to the rotation and revolving of the output shaft 29.

The rotation (rotation) of the inner shaft is transmitted to the tool chuck 55 at the tip end, and the rotary working tool 9 held by the tool chuck 55 is rotated. The revolutions of the outer tube 47 and the inner shaft on the base end side are attenuated toward the distal end and become smaller, but are transmitted slightly. In this case, when the operator holds the grip 51 at the distal end portion of the flexible shaft 7, the vibration is transmitted to the distal end side to such an extent that the deflection caused by the revolving motion at the proximal end side is slightly felt. In other words,
As for the length of the flexible shaft 7, the run-out due to the revolution on the base end side is attenuated, but the run-out is sufficiently maintained even when the operator grips the grip 51 at the distal end for processing. Is set to the length transmitted to the distal end side.

By the way, as shown in FIG. 3, when the rotary working tool 9 rotating at a high speed for processing the work W is brought into contact with the work W, the rotating tool 9 rotating in the direction of arrow A in FIG. The processing tool 9 tends to roll on the surface of the work W in the direction of arrow B due to resistance during processing. That is, the rotary machining tool 9 tends to rebound relative to the workpiece W due to the reaction force of the resistance during machining.

However, in the present embodiment, the length of the flexible shaft 7 is large enough that the deflection caused by the minute eccentric rotation on the base end side is transmitted to the distal end side even when the operator grips. The rotary processing tool 9 attached to the tip of the flexible shaft 7 rotates on its own axis and revolves in the opposite direction with a small radius, so that the rotary processing tool 9 acts on the workpiece W. Working point P
Note that the machining action point P is eccentrically rotated (eccentrically oscillated) with a small radius as shown in FIG.
It moves sequentially from P2 → P3 → P4 → P1.

The working point P moves to draw a trajectory obtained by combining the rotation of the rotary working tool 9 in the direction of arrow A and the eccentric rotation of the small radius in the direction of arrow C. The distance from the center of 9 to the working point P is L
(Mm), the minute radius of the eccentric rotation is R (mm), and the rotation speed α (rad / sec) of the rotary machining tool 9 in the direction of arrow A.
c), the rotation speed in the direction of the eccentric rotation arrow C is β (rad /
sec), the locus drawn by the machining action point P is
(Lsin αt + Lcos αt−Rsin βt +
Rcos βt).

Therefore, depending on the ratio between the rotational speed of the rotary working tool 9 in the direction of arrow A and the eccentric rotational speed in the direction of arrow C, the same working point P returns to the same position.
It is necessary to rotate tens to hundreds of times in the direction of arrow A. In other words, even if there is no relative movement between the rotary processing tool 9 and the workpiece W, the same location of the rotary processing tool 9 acts on the same location of the workpiece W for each rotation of the rotary processing tool 9. Is not. Therefore, the rotary machining tool 9
In this case, extreme wear is suppressed and the tool life is prolonged.

When the working point P1 of the working point P is brought into contact with the workpiece W by the rotation of the rotary working tool 9 in the direction of the arrow A, at the next moment, the working point P1 moves in the direction of the arrow C with a small radius. Moves in the direction of the position P2 due to the eccentric rotation of. The direction of the position P2 is substantially equal to the direction of the reaction force of the resistance when the processing action point P1 attempts to perform the processing of the workpiece W, and is the direction in which the workpiece W escapes from the processing position of the workpiece W. That is, the machining action point P1 tends to escape at the moment when the machining contact point comes into contact with the workpiece W, so that the resistance at the time of machining is reduced and the bouncing of the rotary machining tool 9 due to the reaction force of the resistance is suppressed, so that safety is improved. It will improve more.

Further, since the working point P1 is moved to the position P2, the resistance at the time of working is small, the cutting action is weakened, the working is light, and the heat generation at the time of working can be suppressed. In addition, since the rotary processing tool 9 is eccentrically rotated with a minute radius, the cut of the rotary processing tool 9 with respect to the workpiece W is small and intermittent, and the heat generation of the workpiece and the rotary processing tool 9 is more effectively suppressed. Can be done.

Therefore, when the operator grips the grip 51 of the flexible shaft 7 with one hand and grips the workpiece with the other hand, the grip 51 and the workpiece are slightly elastic due to the flexibility of the operator's hand. When performing appropriate machining with the rotary machining tool 9, the workpiece is not splashed or heated, and the manual machining can be performed safely and easily. is there.

[0025]

As will be understood from the above description, according to the present invention, the grip and the work of the flexible shaft in the manual processing device are gripped by the hands and attached to the distal end of the flexible shaft. When the above-mentioned work is machined with a rotary working tool, the work is not rebounded, and the heat generation of the work can be effectively suppressed, so that the conventional problems as described above can be solved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram schematically showing an overall configuration of a manual processing device according to an embodiment of the present invention.

FIG. 2 is an explanatory sectional view of a rotary drive device.

FIG. 3 is an operation explanatory diagram for explaining a cutting operation of a rotary working tool on a work.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 manual processing device 3 rotary drive device 7 flexible shaft 9 rotary processing tool 15 input shaft 23 eccentric collar 25 eccentric hole 29 output shaft 33 chuck mechanism 47 outer tube 49 base end 51 grip 55 tool chuck

Claims (2)

[Claims] 1. A manual machining apparatus comprising a rotary machining tool at a distal end of a flexible shaft for manual operation, wherein a base end of an inner shaft of the flexible shaft is rotatable about its own axis and the shaft is A manual processing apparatus characterized in that the center is linked to an output shaft that is eccentric and rotatable with a small radius. 2. The manual processing apparatus according to claim 1, wherein the length of the flexible shaft is such that the deflection caused by the minute eccentric rotation imparted to the base end portion of the flexible shaft is transmitted to the tip end portion. A manual processing apparatus characterized in that it is set to: