JP2021062434A - Chuck device - Google Patents

Abstract

To provide a chuck device comprising a plurality of clamp bodies that can be opened/closed, wherein while an amount of retraction of each clamp body is ensured, gripping accuracy is improved and a driving stroke in a direction of an axis is restricted to achieve compactness.SOLUTION: A chuck device comprises: a support body 11; a drive body 2 disposed so as to be movable relative to the support body in a direction of an axis and having a drive part 2c on a side of the support body; a plurality of clamp bodies coupled to the support body so as to be rotatable around a rotation axis, provided with a driven part 13c facing the drive part and driven in a radial direction to grip a to-be-gripped object; and means 15 for urging the clamp bodies in a release direction opposite to a radial grip direction, wherein one of the drive part and the driven part has an inclination surface inclining relative to the axis in a chuck grip state of the clamp bodies.SELECTED DRAWING: Figure 3

Description

The present invention relates to a chuck device.

Conventionally, various chuck devices such as scroll chucks, independent chucks, and collet chucks have been known for gripping workpieces and tools in machine tools and the like. Since the collet chuck of such a chuck device is configured to be gripped by a collet which is an integral metal material having a slit, it is easy to align the object to be gripped and it is possible to position the object to be gripped with high accuracy. Due to its advantages, it is widely used as a chuck device for machine tools.

However, while the collet chuck can improve the gripping accuracy, the tightening allowance is small, so that when a headed shaft such as a bolt is used as a workpiece, the shape cannot be directly gripped. It was attached to the collet chuck via a split bush attached to the workpiece. For this reason, work such as attaching and detaching the split bush is required before and after processing, which is complicated. Therefore, in order to save the trouble of attaching and detaching the split bush and improve the work efficiency, a clamp arm 3 configured to be retractable inside the collet 6 is provided, and the work is gripped by retracting the clamp arm 3 into the collet 6. A structure has been proposed in which the clamp arm 3 is held in a gripped state by tightening the tapered surface 6a of the collet 6 by the spindle 12 (see Patent Document 1 below).

Jikkensho 57-7448

However, in the collet chuck provided with the conventional clamp arm 3, the retreat amount of the clamp arm 3 (the angle or stroke of the retracting operation of the clamp arm 3 from the chuck gripping state to the chuck release state, hereinafter simply referred to as "retraction amount". Since it is necessary to pull the clamp arm 3 into the front opening 6a of the collet 6 from the state where the clamp arm 3 is projected to the outside of the collet 6 in order to secure), it is necessary to operate the sliding operation culm 8 with a large stroke. Therefore, there are problems that the size of the drive system in the axial direction becomes large and that the existing drive system must be significantly modified. Further, even though the collet 6 is used, the operating stroke at the time of driving in the axial direction is large, and the radial driving force given from the main shaft 12 does not directly act on the clamp arm 3, so that the collet 6 is interposed. Since the clamp arm 3 is tightened in the radial direction, it is difficult to improve the gripping accuracy of the clamp arm 3, and there is also a problem that the work cannot be gripped accurately.

Therefore, the present invention solves the above-mentioned problems, and the problem is that in a chuck device provided with a plurality of clamp bodies that can be opened and closed, the gripping accuracy is improved while ensuring the amount of retreat of the clamp body, and the axis line. The purpose is to reduce the size by suppressing the operation stroke when driving in the direction of.

In order to solve the above problems, the chuck device according to the present invention is coaxial with the support so as to be movable relative to the support in the direction of the axis of the support. A drive body that is arranged and has a drive unit on the side of the support is rotatably connected to the support around a rotation axis set along a tangential direction around the axis and has a radius. A chuck gripping state in which a driven portion facing the driving portion is provided so as to be openable and closable in a direction, and the driving portion is driven in the radial direction to grip the object to be gripped by sliding contact with the driven portion. The clamp body is provided with a plurality of clamp bodies, and means for urging the clamp body in a release direction opposite to the gripping direction in the radial direction. At this time, one of the driving portion and the driven portion is configured so that the other of the driving portion and the driven portion is in sliding contact with each other during driving, and is aligned with the axis when the clamp body is gripped by the chuck. It is characterized by having an inclined surface that is inclined with respect to the inclined surface.

In the present invention, the inclined surface is adjacent to a steeply inclined surface portion provided in a range where the other is in sliding contact at the initial stage of driving and a destination where the contact position of the other is moved with respect to the steeply inclined surface portion during driving. It is preferable that the chuck is provided with a gently inclined surface portion formed in a range where the other is in contact with the chuck in the gripped state. By providing the steeply inclined surface portion on the inclined surface, a concave step portion is formed on the inclined surface when the virtual surface obtained by extending the gently inclined surface portion to the side of the steeply inclined surface portion is used as a reference.

In this case, in a chuck released state in which the clamp body is rotated in the radial direction of the release until the maximum amount of retreat is reached, the other is a virtual surface in which the gently inclined surface portion is extended toward the steeply inclined surface portion. It is preferable that the surface is arranged on the side of the inclined surface. At this time, it is desirable to provide a regulation structure that regulates the rotation range of the clamp body in the direction of release so that the other end does not come into contact with the inclined surface. At this time, it is preferable that the regulation structure further includes a stopper that restricts the rotation of the clamp body in the release direction. In this case, the stopper may regulate the position of the end portion on the opposite side of the rotation axis from the side where the drive portion and the driven portion abut when driving in the clamp body in the rotation direction. desirable.

In the present invention, the inclined surface is formed on the clamp body, and the clamp body rotates in the gripping direction toward the chuck gripping state, so that the inclination angle of the inclined surface is reduced and the chuck gripping state is performed. In the state, it is preferable that the inclination angle of the inclined surface is smaller than that in the chuck released state.

In the present invention, the support has the driven portion on the outer surface arranged on the inner peripheral side of the drive body, and the drive body has the drive portion on the inner surface arranged on the outer peripheral side of the support. The means for urging the clamp body is configured to give the clamp body an outward urging force in the radial direction, and the driving portion abuts on the driven portion to exert the urging force. It is preferable that the clamp body is driven inward in the radial direction. In this case, it is desirable that one of them is the clamp body and the inclined surface is formed on the clamp body. At this time, it is desirable that the inclination angle of the inclined surface remains in the state where the chuck is gripped. However, one of them may be the driving body, and the inclined surface may be formed on the driving body. Further, the support body is configured in a sleeve shape having the driven portion on an inner surface arranged on the outer peripheral side of the drive body, and the drive body has the drive unit on an outer surface arranged on the inner peripheral side of the support body. The means for urging the clamp body is configured to give the clamp body an inward urging force in the radial direction, and the driving portion abuts on the driven portion to resist the urging force. The clamp body may be driven outward in the radial direction.

In the present invention, the clamp body is configured to be rotatably connected to the support around the rotation axis and to be detachably attached to and detachable from the base member provided with the driven portion. , It is preferable to have a clamp member attached in a posture extending further to the front of the base member. In this case, the base member is rotatably connected to the support around the rotation axis, and the base end side portion where the driven portion is provided and the front side of the base end side portion ( It is preferable to have a connecting side portion which is provided on a side away from the rotation axis), projects forward from the support and the driving body, and is connected to the clamp member. In particular, it is preferable that the connection side portion has a form in which the thickness increases in the radial direction of the grip with respect to the base end side portion. Further, the base member and the clamp member have a connection region in which the base member and the clamp member overlap each other in the radial direction and are connected and fixed. In the connection region, the base member and the clamp member are positioned so as to be inserted in the radial direction. It is desirable to connect and fix with a pin and a fixing screw screwed in the radial direction. In the above example, this connection region is composed of the connection side portion of the base member and a portion that overlaps the connection side portion of the clamp member in the radial direction.

In the present invention, the means for urging the clamp body is preferably an elastic body arranged in a compressed state that gives an urging force between the support and the clamp body. Here, examples of the elastic body include a coil spring and the like.

In the present invention, the support is provided in a notch portion for accommodating a portion of the clamp body rotatably connected around the rotation axis in the front end region in the direction of the axis, and in the notch portion. On the other hand, it is preferable to provide a support end portion having an outer surface shape adjacent to the axis and having an inclination along the inclination of the inclined surface in the chuck gripping state.

In the present invention, it is preferable to further include a drive mechanism for relatively moving the support and the drive body in the direction of the axis. Here, it is desirable that the drive mechanism includes a cylinder structure that generates a driving force by the pressure of the supplied fluid.

According to the present invention, in a chuck device including a plurality of clamp bodies that can be opened and closed, it is possible to improve gripping accuracy while ensuring a retracting amount (moving amount in the radial direction) of the clamp body, and in the direction of the axis. It is possible to reduce the size of the device by suppressing the operation stroke during driving.

In particular, a steeply inclined surface portion and a gently inclined surface portion are provided adjacent to the inclined surface, the other side slides into contact with the steeply inclined surface portion at the initial stage of driving, and the contact position of the other side shifts from the steeply inclined surface portion to the gently inclined surface portion during driving. By configuring the clamp body to abut on the gently inclined surface portion in the gripped state of the chuck, the operating stroke during driving can be further reduced without sacrificing the amount of retreat of the clamp body, and the gripping accuracy of the clamp body can be maintained.

Further, the clamp body is formed with the inclined surface, and the inclined surface has a large inclination angle in the chuck released state, and the clamp body rotates in the gripping direction during driving, so that the inclined surface is inclined. Since the angle is lowered and the inclination angle of the inclined surface is smaller in the chuck gripping state than in the chuck released state, the inclination angle of the inclined surface is large at the initial stage of driving, so that the clamp body rotates. Since the dynamic efficiency can be increased, the operating stroke during driving can be further reduced, and the gripping accuracy can be further improved because the tilt angle of the inclined surface is small in the chuck gripping state.

It is a perspective view which shows the clamp connection unit which connects the support body and the clamp body of the chuck device of 1st Embodiment. It is an end view (a) and a vertical sectional view (b) of the clamp connection unit of 1st Embodiment. It is a vertical cross-sectional view (a) which shows the chuck release state of the main part of the chuck device of 1st Embodiment, and a vertical cross-sectional view (b) which shows a chuck gripping state. It is an end view (a) and a vertical sectional view (b) which show the whole structure example of the chuck device of 1st Embodiment. It is an end view (a) and a vertical sectional view (b) which show the structure of the main part of the chuck device of 2nd Embodiment. It is a vertical cross-sectional view (a) which shows the state of the clamp body at the time of the maximum retreat in the chuck open state of 1st Embodiment, and the enlarged partial cross-sectional view (b) which shows the facing part of the driving part and the driven part by enlarging. It is a vertical cross-sectional view (a) of the chuck gripping state of 1st Embodiment, and the enlarged partial cross-sectional view (b) which shows the facing portion of the driving part and the driven part by enlarging. An end view (a) and a vertical sectional view (b) showing a state of gripping the work in the chuck gripping state of the first embodiment, a sectional view (c) showing an inclination angle in the vicinity of the driving portion of the driving body, and a driven portion of the clamp body. It is sectional drawing (d) which shows the inclination angle of (inclination surface). An end face showing a state in which the outer view (a), inner view (b), perspective view (c), and three sets of base members of the base member of the clamp body in each embodiment are matched to obtain a rotation angle in a chuck gripping state. It is a figure (d). An end view and a vertical cross-sectional view (a) showing the structure of the main part of the chuck device of the third embodiment, a perspective view (b) and a vertical cross-sectional view (c) showing the shape of the clamp member, and a work shape are shown. It is a three-view view (d). An end view and a vertical cross-sectional view (a) showing the structure of the main part of the chuck device of the fourth embodiment, a perspective view (b) and a vertical cross-sectional view (c) showing the shape of the clamp member, and a work shape are shown. It is a side view (d).

Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, the overall configuration of the first embodiment of the chuck device according to the present invention will be described with reference to FIGS. 1 to 4.

As shown in FIGS. 1 and 2, the clamp connecting unit 10 of the chuck device 1 of the first embodiment includes a support 11 and a clamp body 12 connected to the support 11. The clamp body 12 has a base member 13 connected to the support body 11 and a clamp member 14 detachably fixed to the base member 13. Further, an interior body 16 is arranged inside the support 11, and the interior body 16 is fitted into the interior sleeve 17 and a knockout pin 18 slidably fitted in the interior sleeve 17 in the direction of the axis 10x. And an elastic body 19 such as a coil spring that urges the knockout pin 18 forward in the direction of the axis 10x (left side in the drawing of FIG. 2B). Further, an elastic body 15 such as a coil spring that urges the clamp body 12 outward in the radial direction is interposed between the clamp body 12 and the interior body 16 in a compressed state. In the illustrated example, the elastic body 15 is arranged between the clamp body 12 and the interior body 16, and an elastic force (urging force) is applied between the support 11 and the clamp body 12 via the interior body 16. Generally, the clamp body 12 may be configured so that a force for urging the clamp body 12 in the radial release direction is generated between the clamp body 12 and the support 11.

In the support 11, a tubular (cylindrical) base portion 11a is provided behind in the direction of the axis 10x, and an inverted pyramid (inverted conical) tip that expands in diameter forward in the front portion in the direction of the axis 10x. A portion 11b is provided. The tip portion 11b is provided with a plurality of (three in the illustrated example) notches 11c around the axis 10x so as to open toward the tip side. The base end side portion 13a of the base member 13 of the clamp body 12 is inserted into the notch portion 11c, and the base end side portion 13a is inserted along the tangential direction around the axis 10x fixed to the tip end portion 11b. The connecting shaft 11d is inserted. It should be noted that the structure is not limited to the structure via the connecting shaft 11d, and any configuration is configured so that the support 11 and the clamp body 12 can be rotatably connected around the rotation axis 12x (see FIGS. 6 and 7). Axial support structures can be used.

Here, the rotation axis 12x is set within the range from the opening of the notch portion 11c to the innermost portion with respect to the support 11, but in order to increase the rigidity of the shaft support structure, the figure is shown in the figure. As shown in the example, it is preferable that the component is provided at a position closer to the innermost part than the opening. However, in the present embodiment, since the inverted weight-shaped tip portions 11b are formed on both sides of the notch portion 11c as described above, the rotation axis 12x is located at a position away from the most extreme portion of the notch portion 11c. Is provided, it is possible to suppress a decrease in the rigidity of the shaft support structure. Further, the rotating axis 12x is arranged in front of or behind the clamp body 12 in the direction of the axis 10x with respect to the positions of the driving portion 2c and the driven portion 13c that are in sliding contact with each other during driving, which will be described later. At this time, in the present embodiment, as shown in the illustrated example, it is more preferable that the drive unit 2c and the driven unit 13c are arranged behind the contact position in the direction of the axis 10x.

The connection side portion 13b of the base member 13 and the base end side portion 14a of the clamp member 14 overlap each other in the radial direction. Then, the connection side portion 13b and the proximal end side portion 14a are fixed to each other by the positioning fixing means (positioning fixing structure). In the illustrated example, the positioning fixing means (positioning fixing structure) includes a connecting side portion 13b, a positioning pin 14c inserted through the base end side portion 14a, and a fixing screw 14d. The connecting side portion 13b projects forward in the direction of the axis 10x of the support 11 and is arranged in front of the support 11 (in the illustrated example, the support 11 and the interior body 16). The thickness of the connection side portion 13b is increased inward in the radial direction (the gripping direction of the clamp body 12) as compared with the proximal end side portion 13a. By doing so, the rigidity of the clamp body 12 can be increased and the fixing strength of the base member 13 and the clamp member 14 can be improved without increasing the size in the radial direction, and the positioning fixing means (positioning fixing structure) can be improved. ) Size (hole depth) can also be secured.

As shown in FIG. 9, a radial step 13j is provided between the outer surface including the inclined surface 13d of the front end side portion 13a and the outer surface of the connection side portion 13b, and the outer surface of the connection side portion 13b is the tip end. It is arranged radially inside the outer surface of the side portion 13a. Since the thickness of the clamp member 14 in the radial direction can be absorbed or reduced by the step 13j, the chuck device 1 can be easily miniaturized in the radial direction.

The clamp connecting unit 10 is inserted into the inner hole 2a inside the drive body 2 shown in FIG. In the illustrated example, the drive body 2 is configured in a sleeve shape (cylindrical shape) capable of accommodating the support 11 of the clamp connecting unit 10. A cone-shaped (conical) inclined inner surface portion 2b that expands in diameter toward the front is provided at the front end portion of the inner hole 2a in the direction of the axis 10x. The inclined inner surface portion 2b has a shape that follows the inclined outer surface shape of the tip end portion 11b of the support 11. In the present embodiment, the driving unit 2c for driving the clamp body 12 of the driving body 2 is composed of a part of the inclined inner surface portion 2b, and in the illustrated example, the front end edge of the inclined inner surface portion 2b.

FIG. 4 shows an example of the drive structure of the chuck device 1. In this drive structure, the drive body 2 operates in the direction of the axis 10x due to the cylinder structure composed of the cylinder 3 and the lid body 4. In this cylinder structure, the drive body 2 is configured to be slidable in the direction of the axis 10x inside the cylinder 3 and the lid 4, and the drive body 2 is used as a piston, and the first pressure chamber 3a is moved back and forth in the direction of the axis 10x. And the second pressure chamber 4a are formed. Then, by controlling the pressure of the fluid supplied to the first pressure chamber 3a and the second pressure chamber 4a via the intake / exhaust ports 3b and 4b, for example, a gas such as compressed air or a liquid such as oil, the drive body 2 can be slid back and forth. The front frame 6 supports the clamp connecting unit 10 (support 11) from the front.

Next, the detailed structure of the chuck device 1 of the first embodiment will be described with reference to FIGS. 6-9. As shown in FIG. 6, the base end side portion 13a of the base member 13 constituting the base portion of the clamp body 12 is rotatable inside the notch portion 11c so as to form a rotation axis 12x with respect to the support body 11. It includes a shaft support structure and a driven portion 13c that comes into contact with the driving portion 2c of the driving body 2 described later. The drive unit 2c and the driven unit 13c are in sliding contact with each other at positions shifted in the front-rear direction (forward in the illustrated example) in the direction of the axis line 10x with respect to the rotation axis line 12x. An inclined surface 13d inclined with respect to the direction of the axis 10x is provided on the outer surface of the driven portion 13c. As shown in FIG. 9, the inclined surface 13d is a side where the contact point between the steeply inclined surface portion 13e to which the driving portion 2c, which will be described later is slid, and the steeply inclined surface portion 13e are driven at the initial stage of driving, moves. A gently inclined surface portion 13f adjacent to the surface is provided. By providing the steeply inclined surface portion 13e, a step portion 13g is formed on the inclined surface 13d. In the case of the illustrated example, the positions of the driving portion 2c and the driven portion 13c that are in sliding contact with each other during driving are arranged in front of the rotating axis 12x in the direction of the axis 10x. Further, the position is arranged outside the rotation axis 12x in the radial direction. As a result, the clamp body 12 can be efficiently driven in the present embodiment in which the gripping direction is inward in the radial direction.

In the illustrated example, in the base end side portion 13a, an inclined surface having the same inclination angle as the inclination angle of the gently inclined surface portion 13f is also formed on the base end side of the step portion 13g. As a result, a concave portion is formed on the inclined surface 13d by the stepped portion 13g. In the present embodiment, in the chuck released state shown in FIG. 6, since the clamp body 12 is rotated outward in the radial direction (release direction), the entire inclined surface 13d is in the direction of the axis 10x. It has a steep slope. In the chuck gripping state shown in FIG. 7, since the clamp body 12 rotates inward in the radial direction (grasping direction), the entire tilting surface 13d is gently tilted. Even in this chuck gripping state, as shown in the illustrated example, the inclination angle of the gently inclined surface portion 13f with respect to the axis 10x of the inclined surface 13d remains and is larger than 0.

In the chuck gripping state shown in FIG. 7, the driving portion 2c of the driving body 2 and the driven portion 13c of the clamp body 12 come into contact with each other. At this time, the driving portion 2c is the front end edge of the inclined inner surface portion 2b, and the driven portion 13c is the inclined surface 13d. The reason why the drive unit 2c is the front end edge of the inclined inner surface portion 2b is that the inclination angle (taper angle) θd of the inclined inner surface portion 2b of the drive body 2 and the chuck gripping are as shown in FIGS. This is because the relationship between the inclination angle θe of the steeply inclined surface portion 13e of the inclined surface 13d and the inclination angle θf of the gently inclined surface portion 13f in the state is as follows.
θd <θf <θe
However, the angle difference between θd and θf is as small as about 1 degree because θd = 29 degrees and θf = 30 degrees in the illustrated example. Due to this slight angle difference, the driving portion 2c at the front end edge of the inclined inner surface portion 2b comes into contact with the inclined surface 13d during driving. Note that FIGS. 8A and 8B show how the sphere W, which is the object to be gripped, is actually gripped.

The maximum amount of retreat of the clamp body 12 is limited by the stopper structure that regulates the rotation range in the radial release direction (outward in the illustrated example). In the chuck released state shown in FIG. 6, the corner portion 13h further closer to the base end side than the rotation axis 12x of the base end side portion 13a abuts on the surface 17a of the interior sleeve 17 which is a stopper, whereby the clamp body 12 It is regulated so that the amount of receding in the radial direction does not increase any more. At this time, the inclined surface 13d, which is the driven portion 13c of the clamp member 12, is designed so as not to come into contact with the driving portion 2c of the driving body 2. That is, the maximum retreat amount (maximum opening angle) of the clamp body 12 does not depend on the positional relationship between the driving portion 2c and the driven portion 13c, and the clamp body 12 (corner portion 13h) is regulated by the stopper (interior sleeve 17). It is decided by being done. As a result, the maximum opening angle of the clamp body 12 of the clamp connecting unit 10 is prevented from fluctuating due to the positional relationship with the drive system. This is usually an important configuration because the standby position of the drive body 2 in the chuck released state is not always accurate.

In the present embodiment, the drive unit 2c is arranged in the concave space created by the stepped portion 13g formed by providing the steeply inclined surface portion 13e in the chuck released state. That is, the drive unit 2c is arranged on the side of the inclined surface 13d with respect to the virtual surface extending from the gently inclined surface portion 13f to the side of the steeply inclined surface portion 13e. As a result, the drive unit 2c and the inclined surface 13d can be kept in non-contact without changing the dimensions of the drive body 2. Therefore, there is an advantage that the chuck device 1 can be made compact in the radial direction while ensuring the amount of retreat of the clamp body 12. In other words, the amount of retreat (opening amount) of the clamp body 12 can be increased while suppressing the increase in the size of the chuck device 1 in the radial direction.

Further, by providing the steeply inclined surface portion 13e on the inclined surface 13d of the driven portion 13c, the rotation angle changes in the radial gripping direction (inward in the illustrated example) when the driving portion 2c is in sliding contact at the initial stage of driving. Can be increased, so that the operating stroke during driving can be further reduced. In particular, in the initial stage of driving, since the clamp body 12 itself is in a posture of being greatly inclined with respect to the axis 10x, the amount of change in the rotation angle by the steeply inclined surface portion 13e is particularly large.

Further, in the chuck gripping state shown in FIG. 7, since the drive unit 2c is in contact with the gently inclined surface portion 13f having a small inclination angle, the gripping position of the clamp body 12 is less likely to vary depending on the positional relationship with the drive body 2, and the clamp body 12 is gripped. Since the holding force in the direction of the axis 10x of the drive body 2 for receiving the reaction force from the object W can be reduced, the gripping accuracy of the clamp body 12 can be improved. Further, such an effect is obtained because the inclined surface 13d is provided on the clamp body 12 that rotates in the gripping operation, so that the inclination angle of the inclined surface 13d (slowly inclined surface portion 13f) in the chuck gripping state is further reduced. , Further strengthened.

Next, the chuck device of the second embodiment will be described with reference to FIG. Here, the clamp connecting unit 20 of the second embodiment has substantially the same structure as that of the first embodiment except for the clamp member 24, and the drive body 2 (not shown) has the same structure as that of the first embodiment. Therefore, the same parts are designated by the same reference numerals, and the description of their structures will be omitted. In this embodiment, the work W1 having the small diameter portion Wb between the large diameter portions Wa can be gripped by the grip portion 24c of the clamp portion 24b of the clamp member 24.

Next, the chuck device of the third embodiment will be described with reference to FIG. Here, the clamp connecting unit 30 of the third embodiment has substantially the same structure as that of the first embodiment except for the clamp member 34, and the drive body 2 (not shown) has the same structure as that of the first embodiment. Therefore, the same parts are designated by the same reference numerals, and the description of their structures will be omitted. In this embodiment, the work W2 having the square small diameter portion Wd in front of the large diameter portion Wc is provided by providing the planar viewing angle grip portion 34c of the clamp portion 34b of the clamp member 34 in front of the groove portion 34d. Can be gripped.

Next, the chuck device of the fourth embodiment will be described with reference to FIG. Here, the clamp connecting unit 40 of the fourth embodiment has substantially the same structure as that of the first embodiment except for the clamp member 44, and the drive body 2 (not shown) has the same structure as that of the first embodiment. Therefore, the same parts are designated by the same reference numerals, and the description of their structures will be omitted. In this embodiment, the clamp portion 44b of the clamp member 44 is provided with two grip portions 44c and 44d in the direction of the axis 10x with the groove portion 44e sandwiched between them, so that the small diameter shaft portions We and Wf sandwich the large diameter portion Wg. The work W3 provided in the above can be gripped.

Next, the effects of each of the above-described embodiments will be described by taking the first embodiment as an example. In this embodiment, the clamp connecting unit 10 and the drive body 2 are relative to each other in the direction of the axis 10x by operating the drive body 2 in the direction of the axis 10x using the drive mechanisms 3, 4, 5 and the like shown in FIG. Move to. For example, in the illustrated example, the drive body 2 moves to the front side (left side in the drawing) of the axis 10x from the chuck released state shown in FIG. Then, as shown in FIG. 6B, the drive unit 2c initially slides on the steeply inclined surface portion 13e of the inclined surface 13d of the driven portion 13c, thereby moving the clamp body 12 around the rotation axis 12x. Make a big turn. Eventually, the drive unit 2c shifts from the steeply inclined surface portion 13e to the gently inclined surface portion 13f, and while moving on the gently inclined surface portion 13f, rotates the clamp body 12 more slowly than the initial time, and finally, FIG. As shown in (b), the chuck is gripped while the drive unit 2c is in contact with the gently inclined surface portion 13f.

In each of the above embodiments, the drive unit 2c of the drive body 2 is made to act directly on the driven portion 13c of the clamp body 12, and one of the drive unit 2c and the driven portion 13c is on the axis 10x in the chuck gripping state. The clamp body 12 is provided with an inclined surface 13d inclined in a direction, and is driven by sliding contact of either one of the inclined surfaces 13d with respect to the inclined surface 13d, so that the clamp body 12 rotates and grips the object W to be gripped. Therefore, it is possible to shorten the operation stroke during driving in the direction of the axis 10x and improve the gripping accuracy of the clamp body 12 while ensuring the amount of retreat of the clamp body 12 by the inclination of the inclined surface 13c during driving. ..

Further, in each of the above embodiments, the clamp body 12 is configured to open outward in the radial direction when the chuck is released, and the clamp body 12 is closed inward in the radial direction when the chuck is gripped. By providing the inclined surface 13d on the driven portion 13c, the inclination angle of the inclined surface 13d with which the driving unit 2c is in sliding contact with respect to the axis 10x is large in the chuck open state. Since the rotation angle of the clamp body 12 increases with respect to the movement amount, as a result, the maximum retreat amount of the clamp body 12 can be largely secured without increasing the operating stroke so much. Further, when the chuck is in the gripped state, the tilt angle of the inclined surface 13d with respect to the axis 10x becomes small, so that the gripping position of the clamp body 12 is less likely to vary, and the driving body 2 when receiving the reaction force from the object W to be gripped Since the holding force for maintaining the position in the direction of the axis 10x is also small, the gripping accuracy of the clamp body 12 can be improved.

Further, in each of the above embodiments, by providing the steeply inclined surface portion 13e on the inclined surface 13d, the rotation angle of the clamp body 12 with respect to the operation stroke of the driving body 2 at the initial stage of driving can be further increased, and the steeply inclined surface portion 13e can be further increased. By providing the gently inclined surface portion 13f adjacent to the inclined surface portion 13e, the inclination angle of the inclined surface 13d with which the drive unit 2c abuts in the chuck gripping state with respect to the axis 10x can be further reduced. Therefore, the maximum retreat amount of the clamp body 12 can be further secured, and the gripping accuracy can be further improved.

Contrary to each of the above embodiments, the inclined surface may be provided on the driving portion instead of the driven portion. In this case, as shown by the alternate long and short dash line in FIGS. 6 (b) and 7 (b), the inclined surface 2d is provided on at least a part of the inclined inner surface portion 2b of the drive body 2, and can be slidably contacted with the inclined surface 2d. A part of the base end side portion 13a may be a driven portion 13i. Here, similarly to the above, it is preferable to provide the steeply inclined surface portion 2e and the gently inclined surface portion 2f on the inclined surface 2d. As a result, the operating stroke of the drive body 2 in the direction of the axis 10x can be further shortened, and the gripping accuracy can be further improved. At this time, by providing the steeply inclined surface portion 2e on the inclined surface 2d, the stepped portion 2g is formed in the same manner as described above. Even in this case, as described above, by arranging the driven portion 13i in the concave space formed by the step portion 2g in the chuck released state, the maximum retreat amount can be largely secured as described above. The variation can be reduced.

Further, in each of the above embodiments, the clamp body 12 has a structure in which the base member 13 and the clamp member 14 are detachably fixed, so that the clamp member 14 can be appropriately replaced according to the object to be gripped W. It will be possible. In particular, a base end side portion 13a provided with a connecting structure of the base member 13 to the support body 11 and a driven portion 13c is provided, and the clamp member 14 extends from the base end side portion 13a and projects forward from the support body 11. By providing the connection side portion 13b connected to the connection side portion 13b, the degree of freedom in designing the connection structure of the connection side portion 13b can be increased, so that the connection structure between the base member 13 and the clamp member 14 can be formed as an object to be gripped. While ensuring consistency with the form of the clamp member 14, it can be easily formed according to the requirements for the form of the clamp member 14. In particular, by arranging the connection side portion 13b in front of the support 11 or the like, it is possible to realize a connection mode with the clamp member 14 without being restricted by the support 11 or the like. Further, as described above, by forming the connection side portion 13b thicker in the radial direction than the proximal end side portion 13a, the rigidity of the clamp body 12 can be improved and the clamp member can be used while maintaining the compactness in the radial direction. It is possible to improve the connection strength and accuracy between the two.

The chuck device according to the present invention is not limited to the above-mentioned illustrated examples, and it goes without saying that various modifications can be made without departing from the gist of the present invention. For example, each of the above embodiments is configured such that the clamp body 12 rotates outward in the radial direction to enter the chuck release state, and rotates inward in the radial direction to enter the chuck gripping state. On the contrary, the clamp body may be configured to be in the chuck released state by rotating inward in the radial direction and in the chuck gripping state by rotating outward in the radial direction. Further, in each of the above embodiments, the driving portion 2c of the driving body 2 is arranged on the outer peripheral side in the radial direction, and the driven portion 13c of the support body 11 and the clamp body 12 is arranged on the inner peripheral side in the radial direction. On the contrary, the driving portion of the driving body may be arranged on the inner peripheral side in the radial direction, and the driven portion of the support and the clamp body may be arranged on the outer peripheral side in the radial direction. Further, in each of the above embodiments, the driving portion 2c and the driven portion 13c that come into contact with each other during driving are arranged in front of the rotation axis 12x of the clamp body 12 in the direction of the axis 10x, but the opposite is true. , The driving portion and the driven portion may be arranged behind the rotation axis of the clamp body in the direction of the axis. Further, in each of the above embodiments, the driving portion 2c and the driven portion 13c that come into contact with each other during driving are arranged outside the rotation axis 12x of the clamp body 12 in the radial direction. It may be arranged inside the rotation axis of the clamp body in the radial direction. Further, in each of the above embodiments, the driving unit is driven by moving forward relative to the driven portion in the direction of the axis 10x, but conversely, the driving unit moves relative to the rear in the direction of the axis 10x. It may be configured to be driven by such means. From each of the above viewpoints, the optimum combination may be appropriately set according to the structure and function of the chuck device required by the work shape and the like.

Further, in each of the above embodiments, the steeply inclined surface portions 13e and 2e and the gently inclined surface portions 13f and 2f are configured as surfaces having linear contours in the axial direction, and between the surface portions. It has a clear boundary line. However, the steeply inclined surface portions 13e and 2e and the gently inclined surface portions 13f and 2f need not be limited to the above configuration because the inclination angles with respect to the axis 10x may be large or small and are different from each other. It may be configured as a surface having a continuous integral convex curved contour.

1 ... Chuck device, 2 ... Drive body, 2a ... Inner hole, 2b ... Inclined inner surface portion, 2c ... Drive unit, 2d ... Inclined surface, 2e ... Steep inclined surface portion, 2f ... Slowly inclined surface portion, 2g ... Step portion, 3 ... Cylinder, 3a ... 1st pressure chamber, 3b ... intake / exhaust port, 3c ... connector, 4 ... lid, 4a ... second pressure chamber, 4b ... intake / exhaust port, 4c ... connector, 4d ... opening, 5 ... elastic body , 6 ... Front frame 10, 20, 30, 40 ... Clamp connecting unit, 11 ... Support, 11a ... Base, 11b ... Tip, 11c ... Notch, 11d ... Connecting shaft, 12 ... Clamp body, 12x ... Rotating axis, 13 ... base member, 13a ... base end side portion, 13b ... connecting side portion, 13c ... driven portion, 13d ... inclined surface, 13e ... steeply inclined surface portion, 13f ... gently inclined surface portion, 13g ... stepped portion, 14 , 24, 34, 44 ... Clamp member, 14a ... Base end side part, 14b ... Clamp part, 14c ... Positioning pin, 14d ... Fixing screw, 15 ... Elastic body, 16 ... Interior body, 17 ... Interior sleeve, 18 ... Knockout Pin, 19 ... elastic body

Claims (11)

With the support
A drive body that is arranged coaxially with the support so as to be movable relative to the support in the direction of the axis of the support and has a drive unit on the side of the support.
It is rotatably connected to the support around a rotation axis set along the tangential direction around the axis so that it can be opened and closed in the radial direction, and is driven to face the drive unit. A plurality of clamp bodies provided with a portion and in a chuck gripping state in which the driving portion is driven in the radial direction by sliding contact with the driven portion to grip the object to be gripped.
A means for urging the clamp body in a release direction opposite to the radial gripping direction is provided.
One of the driving portion and the driven portion is configured so that the other of the driving portion and the driven portion is in sliding contact with each other during driving, and is inclined with respect to the axis in the chuck gripped state of the clamp body. Has a slanted surface,
Chuck device. The inclined surface is provided adjacent to a steeply inclined surface portion provided in a range where the other is in sliding contact at the initial stage of driving and a destination where the contact position of the other is moved with respect to the steeply inclined surface portion during driving. The chuck is provided with a gently inclined surface portion formed in a range where the other abuts in the gripped state.
The chuck device according to claim 1. In a chuck released state in which the clamp body is rotated in the radial direction of the release until the maximum amount of retreat is reached, the other side tilts the gently inclined surface portion toward the side of the steeply inclined surface portion. Placed on the side of the face,
The chuck device according to claim 2. It is provided with a regulation structure for restricting the rotation range of the clamp body in the direction of release so that the other does not abut on the inclined surface in the chuck release state.
The chuck device according to any one of claims 1-3. The inclined surface is formed on the clamp body, and the inclined surface is formed on the clamp body.
By rotating the clamp body in the gripping direction toward the chuck gripping state, the inclination angle of the inclined surface is lowered, and the inclination angle of the inclined surface is smaller than that in the chuck released state in the chuck gripping state. Get smaller,
The chuck device according to any one of claims 1-4. The support has the driven portion on an outer surface arranged on the inner peripheral side of the drive body.
The drive body is configured in a sleeve shape having the drive unit on an inner surface arranged on the outer peripheral side of the support.
The means for urging the clamp body is configured to give the clamp body an outward urging force in the radial direction.
When the driving portion is in sliding contact with the driven portion, the clamp body is driven inward in the radial direction against the urging force.
The chuck device according to any one of claims 1-4. The inclined surface is formed on the clamp body, and the inclined surface is formed on the clamp body.
The inclination angle of the inclined surface remains in the chuck gripped state.
The chuck device according to claim 5. The clamp body is rotatably connected to the support around the rotation axis, and is configured to be detachably attached to and detachable from a base member having the driven portion and the base member. It has a clamp member, which is attached in a posture extending further forward of the.
The chuck device according to any one of claims 1-7. The base member is rotatably connected to the support around the rotation axis, and is provided in front of the base end side portion where the driven portion is provided and the base end side portion, and the above-mentioned base member is provided. It has a support and a connecting side portion that protrudes forward of the driving body and to which the clamp member is connected.
The chuck device according to claim 8. The connection side portion has a form in which the thickness increases in the radial direction of the grip with respect to the base end side portion.
The chuck device according to claim 9. The support has a notch that accommodates a portion of the clamp body that is rotatably connected around the rotation axis in the front end region in the direction of the axis, and the axis with respect to the notch. A support end having an outer surface shape that is adjacent to the periphery of the chuck and has an inclination along the inclination of the inclined surface in the gripped state of the chuck.
The chuck device according to any one of claims 1-10.

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