JPS6014641B2 - Mechanical work driver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanical work driver that is attached to the main shaft of a machine tool such as a lathe and grips and rotates the outer periphery of a centered work (workpiece).

Conventional mechanical work drivers of this type have a plurality of rotating claws rotatably supported on an annular bearing ring that is floating relative to the chuck body, and these rotating claws are rotated. It is known that the bearing ring is moved to make contact with the workpiece, and when the workpiece is eccentric, the bearing ring is moved toward the eccentric side according to the eccentricity of the workpiece.
In such a mechanical work driver, it is difficult to manufacture a lightweight bearing ring due to its strength, and the weight is quite large, so when the bearing ring is moved to the corner side, the rotational balance may be affected. becomes noticeably looser,
It had the disadvantage of being unsuitable for machine tools that rotate at high speeds, and could not be used when high precision was required.

In addition, the grasping range changes only by the rotation of the rotating claws, so if you want to obtain a large grasping range with one type of rotating claws, you must increase the rotation angle of the rotating claws considerably. However, when the grasping diameter is large, the spreading jaws protrude outward beyond the outer periphery of the chuck body, resulting in a large swing of the mechanical work driver as a whole, resulting in poor rotational balance. Moreover, in the case of the conventional structure, since the bearing ring is made to float, the structure becomes complicated and the manufacturing cost increases.
Therefore, the present invention aims to eliminate the above-mentioned conventional drawbacks by making it possible to extremely reduce the eccentric weight when grasping a workpiece, and to ensure a large grasping range without increasing the rotation angle of the rotating claw. It is an object of the present invention to provide a mechanical work driver which can be manufactured at low cost due to its simple structure. Next, embodiments of the present application will be described in detail with reference to the drawings.
Reference numeral 1 denotes a chuck body constituting a two-jaw automatic centripetal chuck A, whose rear surface (the left side in FIG. 2) is supported by the main shaft (not shown) of a machine tool and is fixed with a mounting bolt 2. There is. A sleeve flow hole 3 is formed in the center of the chuck body 1, and a draw sleeve 4 is inserted into the sleeve flow hole 3 in the direction of the rotational axis of the chuck body 1 while being prevented from rotating by a sliding key 5. It has been made possible to do so. A connecting bolt 6 is rotatably inserted into the stepped sleeve hole 4a of the draw sleeve 4, and is prevented from being removed by a locking nut 7. The connecting bolt 6
is screwed to a drawbar (not shown) inserted into the hole of the main shaft. A matching groove 8 (one not shown) is formed on the outer periphery of the draw sleeve 4 so as to divide the periphery into two equal parts. Furthermore, one pawl sliding groove 9 is formed in the front side of the chuck body 1 in a radial direction, and master pawls 10 are fitted into these pawl sliding grooves so as to be slidable in the radial direction. . This parent claw 101 has an iron handle 11 formed on its rear side, and a pivot 12 on its front side (right side in Fig. 2).
are integrally protruded. In addition, this parent nail has 10 parent nails.
An oil supply hole 13 for supplying lubricating oil from the outer circumferential end surface of the chuck body 1 is formed on the sliding surface between the chuck body 1 and the chuck body 1,
It is closed by grease fitting 14. Further, a crank storage chamber 15 is formed in the chuck body 1 behind the pawl sliding groove 9, and an L-shaped crank 16 is inserted into the crank housing chamber 15 via a shaft 17 on which the chuck body 11 is supported. It is supported so that it can swing. One end of this crank 16 is connected to the joining groove 8 of the draw sleeve 4, and the other end is connected to the competing groove 11 of the main pawl 10, and is swung by the movement of the draw sleeve 4 in the mariline direction to connect the main pawl 10. It is designed to slide in the radial direction. Further, an oil supply hole 18 is formed in the crank 16 and the shaft 17 for supplying lubricating oil to the fitting grooves 8 and 11, and is closed by a grease fitting 19. Next, a pilot bushing 20 is fixed to the front central portion of the chuck body 1 with a mounting screw 21, and a center 22 with a flange 22a is rotatably iron-coupled to a hole 20a of the pilot bushing 20.

Further, a bearing 23a is interposed between the golden plate 22a of the center 22 and the pilot bushing 20 for smooth rotation of the center 22. Said center 2
2 is a mounting screw 24 on the front of the pilot bushing 20.
The tip of the center 22 is prevented from coming out by the center presser 25 which is firmly attached to the hole 25 of the center presser 25.
The center hole of the workpiece M is protruded from the center and can receive the center hole of the workpiece M. The center presser 25 has a rectangular planar shape as shown in FIG.
The zero-side surface 25a is positioned in a direction perpendicular to the moving direction of the master claw 10, that is, the moving direction of a correction plate to be described later. The surface 25a of this sensor presser foot 25 has a fourth
As shown in FIGS. 1 to 6, spring supporting portions 27 are formed respectively. Further, the center presser 25 is formed with a cover plate 28 over the entire circumference, which covers a notch hole of a correction plate to be described later with a considerable margin in the direction of movement of the master claw 10. On the other hand, a correction plate guide groove 29 is formed on the front surface of the chuck body 1 in the same direction as the sliding direction of the main claw 10, and a correction plate 30, which is illustrated as a correction member, can be slid on this correction plate guide book 29. They are grouped together.

Notches 31 are provided at both ends of the correction plate 30 to avoid interference with the pivot shaft 12 provided on the main pawl 10, and the notches 31 are fitted with iron into the pivot shaft 12. Further, a rectangular notch hole 32 is provided in the center of the correction plate 30 to avoid interference with the center presser 25, and the center presser 25 is inserted into this notch hole 32 with a considerable margin in the movement direction of the correction plate 30. Fitted pilot bushing 2
It is fixed at 0. Each surface 32a of the peripheral surface of the notch hole 32 on the parent claw 10 side is provided in a direction perpendicular to the moving direction of the correction plate 30, and these surfaces 32a have fourth to fourth surfaces 32a.
As shown in Fig. 6, the spring part 2 of the center presser 25
A spring abutment rear part 33 is formed at a position opposite to 7. A posture maintaining spring 34 made of a plate spring is compressed and interposed between the spring support part 33 and the spring contact part 27, respectively.
As a result, the correction plate 30 is normally held in a symmetrical position with respect to the rotation center of the chuck body 1, and as will be described later, the gripping portion 38 of the double sardine claw 36 is held symmetrically with respect to the rotation axis of the chuck body 1. It is designed to be located at a position where
Furthermore, correction pins 35 are provided in the vicinity of the sides of the notches 31 at both ends of the correction plate 30 . On the other hand, each master claw 1
A rotating pawl 36 is rotatably iron-coupled to each of the pivot shafts 12 in front of the correction plate 30, and is prevented from being removed by a retaining screw 37 screwed onto the pivot shaft 12.

The rotating claw 36 is formed with a grip portion 38 that draws a curve that gradually increases in distance from the pivot shaft 12. The grip portions 38 of both rotating claws 36 are formed symmetrically with respect to the rotation axis of the chuck body 1, as shown in FIG. In addition, each rotary pawl 36 is provided with respect to a straight line passing between the mounting portions of the two rotary pawls 36 and the pivot shafts 12 in the rotation range between the open state and the closed state of the rotary pawl 36.
Connecting grooves 39, which are illustrated as connecting parts, are formed in portions located on the opposite side of the gripping part 38, respectively. As shown in FIG. 1, the correction pins 35 of the correction plate 30 are fitted in these connecting grooves 39, respectively, and the two connecting portions are connected via the correction plate 30. The connecting groove 39 is set so that when the correction plate 30 is positioned at the center position as will be described later, both rotating claws 36 become symmetrical with respect to the center of rotation of the chuck body 1. Next, place the center of the workpiece M on the center 22 of the mechanical workpiece driver having the above configuration as shown in FIG. 7A.
As shown in FIG.
, 36 will be described below. First, when the draw sleeve 4 is slid to the left in FIG. 2 by the hydraulic cylinder, both cranks 16, 16 are swung, respectively, and the main claws 10, 10 are slid toward the rotation center of the chuck body 1. make it move. When the main claws 10, 10 are slid in the direction of the rotation center of the chuck body 1 in this way, the rotating claws 36, 36, which are iron-coupled to the pivots 12, 12 on the main claws 10, 10, 12 is moved toward the rotation center of the chuck body, but the connection grooves 39 and 39 portions are moved toward the rotation center of the chuck body 1 by the correction plate 3.
0, the gripping parts 38, 38 are respectively rotated so as to approach the rotation center of the chuck body 1, as shown in FIG. 7B. Due to the rotation of these rotating claws 36, 36, the gripping part 38 of the rotating claw 36 on the side where the workpiece M is biased, that is, the upper rotating claw 36 in FIGS. It first comes into contact with the outer circumferential surface of the workpiece M, and subsequent rotation of the rotating claw 36 in the same direction is prevented. The master claws 10, 10' are also forcibly slid toward the rotation center of the chuck body 1. Therefore, as the parent claws 10, 10 slide thereafter, the upper rotating claw 36
Due to the movement of the pivot shaft 12, the connecting groove 39 pushes the correction pin 35 and moves the correction plate 30 downward in the direction of the other rotating claw 36, that is, in FIGS. 1 and 7, against the spring force of the posture holding spring 34. As shown in FIG. 7C, the gripping portion 38 of the rotating claw 36 is rotated in the clockwise direction (claw opening direction) with the gripping portion 38 in contact with the outer peripheral surface of the workpiece M. The workpiece M is rotated slightly counterclockwise together with the center 22 via the bearing 23 and is pressed against the outer peripheral surface of the workpiece M. On the other hand, the other rotating claw 36, that is, the lower rotating claw 36 in FIGS.
is rotated counterclockwise in FIG. 7C by the movement of the correction plate 30 toward the center of rotation, and the connecting groove 39 is also pushed by the correction pin 35 due to the movement of the correction plate 30, and the recoil gauge is rotated in the direction of the rotation center in FIG. 7C. As a result, the gripping portion 38 of the rotating claw 36 is supported on the outer circumferential surface of the workpiece M. After the gripping part 38 of the lower rotating claw 36 has touched the outer circumferential surface of the workpiece M in this way, the gripping parts 38 of both the rotating claws 36, 36,
38 is strongly pressed against the outer peripheral surface of the workpiece M, and this workpiece M
grip firmly. Next, in this state, rotate the spindle to move the mechanical work driver and work M to the first
, 7 in the counterclockwise direction to process the workpiece M. Along with this machining of the workpiece M, the workpiece M has the first,
In Fig. 7, when a rightward (clockwise) moment is applied, both rotating claws 36, 36 are slightly rotated counterclockwise by an angle corresponding to the biting into the workpiece M. The large force applied to the correction pin 35 on the correction plate 30 is removed, and no large force is applied to the correction pin 35 and the correction plate 30. Note that the connecting grooves 39, 39 provided in the rotating claws 36, 36 are provided in a size that allows the rotating claws 36, 36 to rotate with a margin corresponding to the biting, as described above. next,
When releasing the grip on the work M, draw sleeve 4
is moved to the left in FIG.
0 and 10 are slid in the radial outward direction by the cranks 16 and 16, thereby releasing the grip on the workpiece M. That is, when the main claw 10, ID is moved in the radial outward direction, the seventh
In the figure, the gripping portion 38 of the upper rotating claw 36 remains in contact with the workpiece M, and the lower rotating claw 36 is rotated clockwise while the correction plate 30 is moved to the center by the force of the posture holding spring 34. The parts are returned to their original positions, and then the upper spreading claws 36 are also rotated clockwise to release the grip on the workpiece M.
In the above embodiment, the rotating claws are connected to each other by a correction plate guided by the chuck body, but the present application is not limited to this, and the correction plate does not pass through the center of the chuck body. The correction member may also be formed by a connecting rod or a connecting plate that is bent in this way or has a hole, and the rotating pawl and the rotating pawl may be connected by this connecting rod or connecting plate.

It goes without saying that the same machine can also be applied to a chuck body other than a crank type, such as a chuck using a sliding door, or a chuck equipped with a movable center and a workpiece locator. As described above, in the present invention, a spreading claw is attached to each master claw of the second jaw motion seeking zero chuck, these spreading claws are connected to each other by a correction member, and the grasping side of the main claw is When the rotation of one of these rotation claws is stopped, the compensation member is moved by the subsequent movement of the master claw, and the other rotation claw is rotated. I made it move, so
If the workpiece to be gripped is offset from the center of rotation of the chuck body, the rotation angle of the rotary jaws can be corrected according to the workpiece's eccentricity. The gripping portion can be brought into reliable contact with the circumferential surface of the workpiece, and the workpiece can be gripped reliably.

Furthermore, even if the gripping part of the rotating claw can be brought into reliable contact with the circumferential surface of the eccentric workpiece as described above, the connection parts of the two rotating claws each pivotally connected to the main claw may not be connected to each other. They are connected to each other by a correction member, and when the rotation of one rotating pawl is stopped, the master pawl moves the correction member, and this correction member rotates the other rotating pawl, so that both rolling pawls are connected to each other. Since the gripping part is brought into contact with the workpiece, the correction member that is moved according to the workpiece's deviation D' can be manufactured to be relatively lightweight in terms of strength, thereby reducing the overall deviation of the mechanical workpiece driver to zero. The weight can be reduced and rotational balance can be improved, which is particularly effective when used for high-speed rotation. Also, as mentioned above, the rotating claw is pivotally attached to the main claw,
By moving the parent jaw toward the gripping side, the rotation center of the rotating jaw is moved in the radial direction of the chuck body, and the rotating jaw is rotated to grip the workpiece. Even with the rotating claw, a wide grasping range can be secured, which has the practical effect of expanding the range of application. Furthermore, even if a large grasping range can be secured as described above, the center of rotation of the rotary jaw is moved in the radial direction of the chuck body, and the rotating jaw is rotated to grip the workpiece. Therefore, it is possible to reduce the rotation angle of the spreading claw, which has the advantage of preventing the spreading claw from protruding greatly toward the outer diameter of the chuck body, thereby reducing the overall swing. , which has a remarkable effect in achieving high-speed rotation. Moreover, it has the advantage of being extremely simple in structure and inexpensive to manufacture.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a front view of the Isoriki type work driver, FIG. 2 is a sectional view taken along the Rolo line in FIG. 1, and FIG. 3 is a sectional view taken along the line m-m in FIG. Figure 4 is an enlarged view of the main part of Figure 1, Figure 5 is a sectional view taken along the line V-V in Figure 4, and Figure 6 is
The figure is an exploded perspective view of the main parts of the mechanical work driver.
The figure is an explanatory diagram of the operation. A... Automatic centripetal chuck, 1... Chuck body, 1
0... Main claw, 30... Correction plate (correction member), 34... Posture holding spring, 36... Rotating claw, 39... Gripping section. Figure 4 Figure 5 Figure 6 Figure 1 Figure 2 Figure 3 Figure 7

Claims (1)

[Claims] 1. Rotating claws whose tips are formed into gripping parts are pivotally attached to the front surface of each parent claw in a two-jaw automatic centripetal chuck so as to rotate on a plane perpendicular to the rotational axis of the chuck body, and these The rotating claws are located on the opposite side of the gripping part of each rotating claw with respect to the straight line passing through the pivot joints of both rotating claws in the rotation range between the open state and the closed state of the rotating claws. A connecting portion is provided, and the connecting portions of the rotating claws are connected to each other by a correction member, and the gripping portions of both rotating claws are symmetrical with respect to the rotational axis of the chuck body between the correction member and the chuck body. A mechanical work driver characterized by being equipped with a biasing spring that resiliently holds a correction member in a central position so that