JP5694267B2 - Chuck - Google Patents

Description

  The present invention relates to a chuck that is provided in an NC table device and is rotated while holding a workpiece.

  The chuck is provided in an NC table device such as a speed reducer and an indexing device, and is rotated while holding the workpiece. Various rotary chucks are already known, and among them, there is a rotary chuck disclosed in Japanese Utility Model Laid-Open No. 6-57507. FIG. 3 shows a state in which such a rotating chuck is attached to the NC table device.

  As shown in FIG. 3, a table face plate 81 that rotates integrally with the spindle is fixed to the end of the spindle of the NC table device 80, and the chuck 90 is attached to the table face plate 81 via an adapter 82. Attached.

  The chuck 90 includes a cylindrical chuck body 91, a master jaw 92 slidably engaged with the chuck body 91, and a claw 93 attached to the master jaw 92 and gripping a workpiece. .

  The chuck body 91 is formed with a fitting groove 91a into which the master jaw 92 is fitted. The fitting groove 91a is a long groove that communicates from the outer periphery of the chuck body 91 toward the center of rotation. The fitting groove 91a has an open surface (hereinafter referred to as a claw-side surface) opposite to a surface (hereinafter referred to as a table-surface plate-side surface) attached to the table surface plate 81 of the chuck body 91. The exposed surface of the master jaw 92 is exposed from this open portion. A claw 93 is attached to the exposed surface of the exposed master jaw 92.

  Further, guide convex portions 92b are respectively provided on both sides of the master jaw main body 92a of the master jaw 92 in the width direction. The pair of guide convex portions 92b are slidably engaged with guide concave portions (guide grooves) 91b provided in the fitting grooves 91a of the chuck body 91, respectively. The guide recess (guide groove) 91 b is a groove communicating with the chuck body 91 in the radial direction. The master jaw 92 is movable in the radial direction of the chuck main body 91 in the fitting groove 91a through a pair of guide convex portions 92b engaged with the guide concave portions (guide grooves) 91b.

Japanese Utility Model Publication No. 6-57507

  In the above chuck, when the chuck groove 91a is cut and processed in the chuck body 91, cutting is performed from a surface opposite to the side of the chuck body 91 attached to the table face plate 81 (hereinafter referred to as a claw-side surface). To do.

  Further, in this fitting groove 91a, the table face plate 81 of the chuck body 91 is cut from the surface on the claw side in order to form a guide recess (guide groove) 91b.

  In the processing of the fitting groove 91a and the guide recess (guide groove) 91b, processing accuracy is required so that the master jaw 92 can be accurately slid, but cutting can be performed only from the surface of the chuck body 91 on the claw side. . Therefore, it is difficult to process the fitting groove 91a and the guide recess (guide groove) 91b, and there is a problem that the processing time becomes long in order to realize the required processing accuracy.

  Further, in the conventional chuck 90, the master jaw 9 is fitted to the chuck main body 91. In the axial direction of the main shaft, the length from the surface of the chuck body 91 on the table face plate side to the surface on the chuck side (the thickness of the chuck body 91) is the face on the side of the master jaw 92 attached to the table face plate (hereinafter referred to as It is longer than the length (the height of the master jaw 92) from the opposite surface (hereinafter referred to as the upper surface of the master jaw 92) to the opposite surface (hereinafter referred to as the upper surface of the master jaw 92).

  When the claw 93 grips the workpiece, a force that acts to raise the master jaw 92 relative to the chuck body 91 via the claw 93 is generated. Even if this force occurs, the master jaw 92 can be prevented from rising by the bottom surface of the master jaw 92 coming into contact with the fitting groove 91a and the guide recess (guide groove) 91b. The thickness of the chuck body 91 in which the fitting groove 91a is formed is made somewhat longer than the height of the master jaw 92 so that the master jaw 92 can receive the force that makes contact with the fitting groove 91a and the guide recess (guide groove) 91b. There is a problem that it is difficult to make the chuck body 91 thinner and lighter.

  Further, this conventional chuck 90 having a thick chuck body 91 is attached to the table face plate 81 of the NC table device 80 via the adapter 82, whereby the amount of protrusion of the chuck 90 from the table face plate 81 is increased, and the work space is reduced. There was a problem of becoming narrower.

  From the above points, the present invention makes it easy to process the portion with which the master jaw engages, shortens the processing time, realizes energy saving of the NC table device by reducing the weight of components attached to the main shaft, and attaches to the main shaft. An object of the present invention is to provide a chuck capable of realizing an enlargement of the work space of the NC table device by reducing the thickness of the parts to be manufactured.

  In order to solve the above problem, the chuck according to claim 1 is an NC table device having a main shaft, and is attached to a table face plate that is fixed to an end portion of the main shaft and rotates integrally with the main shaft, and has a cylindrical shape. A chuck body in which a plurality of engagement notches are formed from the outer periphery toward the center of rotation, and slidably engaged with each of the engagement notches, and the same number of master jaws as the engagement notches And a plurality of claws respectively attached to the master jaws and radially disposed from the center of rotation toward the outer circumferential direction on the surface opposite to the side on which the chuck body is attached to the table face plate. The engagement notch has a surface that is attached to the table face plate of the chuck body and a surface opposite to the surface thereof open, and the chuck Body said master jaws being attached to said table surface plate is adapted to abut on the table surface plate.

  According to the chuck of the first aspect, the surface of the chuck main body attached to the table face plate and the opposite surface are open, so that the engagement notch that is a portion with which the master jaw engages is processed. This can be done from both the surface of the chuck body attached to the table face plate and the opposite surface. Therefore, the engagement notch can be easily processed, and the processing time can be shortened.

  Further, in the chuck according to the first aspect, the force that acts to raise the master jaw with respect to the chuck body is received by the master jaw coming into contact with the table face plate. Accordingly, it is not necessary to secure the thickness of the chuck body, and in the chuck according to the first aspect, the thickness of the chuck body can be approximately the same as the height of the master jaw. Furthermore, the chuck of claim 1 is directly attached to the table face plate without using an adapter. Therefore, it is possible to reduce the weight and thickness of components attached to the table face plate, thereby saving energy of the NC table device and expanding the work space of the NC table device.

  The chuck according to claim 2 is an NC table device including a main shaft, is attached to an end of the main shaft, has a cylindrical shape, and has a plurality of notches for engagement from the outer periphery toward the rotation center. Chuck bodies and slidably engaged with the engaging notches, respectively, the same number of master jaws as the engaging notches, and attached to the master jaws, respectively, the chuck body being the end of the main shaft A chuck having a plurality of claws radially arranged from the center of rotation toward the outer circumferential direction on a surface opposite to a side attached to the chuck, wherein the engagement notch is an end of the main shaft of the chuck body And the opposite surface is open, and the master jaw is attached to the end of the main shaft in a state where the chuck body is attached to the end of the main shaft. So that the contact.

  According to the chuck of the second aspect, since the surface attached to the end portion of the main shaft of the front chuck body and the surface on the opposite side are open, the engagement notch that is the portion with which the master jaw engages Processing can be performed from both the surface of the chuck body attached to the table face plate and the opposite surface. Therefore, the engagement notch can be easily processed, and the processing time can be shortened.

  Further, in the chuck according to the second aspect, similarly to the chuck according to the first aspect, the force that acts to raise the master jaw with respect to the chuck main body can be received by contacting the end of the main shaft with the master jaw. ing. Accordingly, it is not necessary to ensure the thickness of the chuck body, and in the chuck according to claim 2, it is possible to make the thickness of the chuck body substantially the same as the height of the master jaw. Furthermore, the chuck of claim 2 is directly attached to the table face plate without using an adapter. Therefore, it is possible to reduce the weight and thickness of parts attached to the end of the main shaft, and to save energy in the NC table device and to expand the work space of the NC table device.

  According to a third aspect of the present invention, in the chuck according to the first or second aspect, the engagement notch has a pair of side walls extending from the outer periphery toward the rotation center in a state of being opposed to each other. Is a step surface facing the table face plate or the end of the main shaft, a first facing surface extending from one side of the step surface to a surface attached to the end of the main shaft of the chuck body, and the other side of the step surface A second opposing surface extending toward the opposite surface, the first opposing surface spacing of both side walls is longer than the second opposing surface spacing, The guide protrusions are formed on surfaces respectively corresponding to the pair of side walls of the engagement notch, and the guide protrusions are formed on the table face plate or the end of the main shaft, the first facing surface, and the step surface. Mates in enclosed space It has become to so that.

  According to the chuck of the third aspect, in addition to acting in the same manner as the chuck of the first or second aspect, the guide projecting portion includes the table face plate or the end of the main shaft, the first facing surface, and the step surface. So that the master jaw 92 can be accurately slid.

  According to the invention of any one of claims 1 to 3, it is easy to process the notch for engagement, which is a portion for engaging the master jaw, and the processing time can be shortened. Furthermore, the NC table device can be made energy-saving by reducing the weight of the chuck body, and the work space of the NC table device can be expanded by reducing the thickness of the chuck body.

It is a perspective view which shows the NC table apparatus which attached the chuck | zipper of one Embodiment of this invention. It is an enlarged plan view of the master jaw vicinity of the NC table device to which the chuck is attached. It is a perspective view which shows the NC table apparatus which attached the conventional chuck | zipper.

  Hereinafter, a chuck 1 according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the chuck 1 is attached to an NC table device 2 such as a lathe having a main shaft in order to grip and rotate a workpiece. In this embodiment, it is directly attached to a disk-shaped table face plate 3 that is fixed to the end of the main shaft of the NC table device 2 and rotates integrally with the main shaft.

  The chuck 1 includes a cylindrical chuck body 11 attached to the table face plate 3, three claws 12 disposed on the surface of the chuck body 11 opposite to the table face plate 3 (hereinafter referred to as a claw side face), These claws 12 are attached to each other, and a master jaw 13 for reciprocating the claws 12 in the radial direction of the chuck body 11 is provided.

  Hereinafter, the chuck 1 will be described in detail.

  The chuck body 11 has a cylindrical shape, a circular surface on the side to be attached to the table surface plate 3 (hereinafter referred to as a surface on the table surface plate side), and a circular shape that faces the surface on the table surface plate side in the axial direction of the main shaft. A claw side surface, and a side peripheral surface between the table face plate side surface and the claw side surface. The thickness of the chuck body, which is the distance in the axial direction of the spindle between the surface on the table face plate side and the surface on the claw side of the chuck body 11 of this embodiment, is shorter than that of the conventional chuck body. Therefore, it can be said that the chuck body 11 has a disk shape rather than the above-described columnar shape.

  With the chuck 1 attached to the table face plate 3, the center of the table face plate side surface and the claw side surface is positioned on the axis of the main shaft, and the center of the table face plate side surface and the claw side surface. Is the center of rotation.

  The chuck body 11 is formed with a plurality of engagement notches 14 from the side peripheral surface, which is the outer periphery, toward the center of rotation. The engaging notch 14 has a table face plate side surface and a claw side surface open. Further, the engagement notch 14 is also opened on the side peripheral surface side of the chuck body 11.

  The engagement notch 14 has a pair of side walls extending from the outer periphery toward the rotation center in a state of being opposed to each other.

  As shown in FIG. 2, each side wall has a step surface 14a facing the table surface plate 3, a first facing surface 14b extending from one side of the step surface 14a toward the surface on the table surface plate side of the chuck body 11, and a step. A second opposing surface extending from the other side of the surface 14a toward the surface on the claw side. The interval between the first opposing surfaces 14b of both side walls is longer than the interval between the second opposing surfaces 14c.

  The perpendicular lines of the first facing surface 14b and the second facing surface 14c are orthogonal to the axis of the main shaft and are orthogonal to the radii of the surface of the chuck body 11 on the table face plate side and the claw side. Moreover, the perpendicular of the step surface 14a is parallel to the axis of the main axis.

  Since the notch 14 for engagement is open on the surface on the table face plate side and the surface on the claw side, the master jaw 13 exposes both surfaces facing the axial direction of the main shaft as shown in FIG. It is like that. The exposed surface of the master jaw 13 has a table face plate side as a bottom surface and a claw side as an upper surface. The distance in the axial direction of the main shaft from the bottom surface to the top surface of the master jaw 13 is defined as the height of the master jaw 13.

  A claw 12 is attached to the upper surface of the master jaw 13. Further, the bottom surface of the master jaw 13 comes into contact with the table face plate 3.

  The master jaw 13 is formed with guide protrusions 13a and 13a on surfaces corresponding to the pair of side walls of the engagement notch 14, respectively. As shown in FIG. 2, the master jaw 13 has a substantially cross shape when viewed from the open portion of the side peripheral surface of the engagement notch 14.

  The guide protrusion 13a of the master jaw 13 is slidably fitted in a space surrounded by the table face plate 3, the first facing surface 14b, and the stepped surface 14a on each side wall side.

  The bottom surface of the master jaw 13 is in contact with the table face plate 3.

According to the chuck 1 configured as described above, since the surface on the table face plate side and the surface on the claw side of the chuck main body 11 are open, the engagement notch 14 which is a portion with which the master jaw 13 is engaged. This processing can be performed from both the surface on the table face plate side and the surface on the claw side of the chuck body 11. The engagement notch 14 is slidably fitted in contact with the master jaw 13, and in particular, the surface of the engagement notch 14 that contacts the master jaw realizes accurate sliding of the master jaw. Therefore, sufficient processing accuracy is required.

As described above, in the conventional chuck, the fitting groove and the guide recess (guide groove) with which the bottom surface of the master jaw abuts can be processed only from the claw side of the chuck body. In order to realize sufficient processing accuracy, there is a problem that processing time becomes long. On the other hand, the chuck of the present invention that can process the engagement notch 14 from both the table face plate side surface and the claw side surface of the chuck body 11 has sufficient processing accuracy of the engagement notch 14. Can be easily processed to reduce the processing time.

Further, in the chuck 1, the force that acts to raise the master jaw 13 with respect to the chuck body 11 is received by the bottom surface of the master jaw 13 coming into contact with the table face plate 3. Thereby, it is not necessary to ensure the thickness of the chuck body 11, and in the chuck 1 of the present embodiment, the thickness of the chuck body 11 can be made substantially the same as the height of the master jaw 13. Furthermore, the chuck 1 of this embodiment is directly attached to the table face plate 3 without using an adapter.

  Therefore, by reducing the weight of the chuck 1 itself and directly attaching the chuck 1 to the table face plate 3 without using an adapter, it is possible to reduce the weight of the parts attached to the table face plate 3, thereby realizing energy saving of the NC table device. .

  Furthermore, by making the chuck 1 itself thin and attaching the chuck 1 directly to the table face plate 3 without using an adapter, the amount of parts to be attached to the table face plate 3 from the table face plate 3 is reduced, and the work of the NC table apparatus is reduced. Space can be expanded.

Moreover, in this invention, when the bottom face of the master jaw 13 contact | abuts to the table surface board 3, there also exist the following effects.

In the conventional chuck, the bottom surface of the master jaw comes into contact with a fitting groove and a guide recess (guide groove) formed in the chuck body by cutting. The surface of the fitting groove and the guide recess (guide groove) with which the master jaw abuts needs to have a sufficient processing accuracy to realize accurate sliding of the master jaw. However, as described above, in the conventional chuck, the fitting groove and the guide recess (guide groove) with which the bottom surface of the master jaw comes into contact can be processed only from the claw side of the chuck body. In order to realize sufficient processing accuracy, there is a problem that processing time becomes long.

  In contrast, in the present invention, it is the table face plate 3 that the bottom surface of the master jaw 13 contacts. Since the table face plate 3 has a disk shape, the surface processing for realizing sufficient processing accuracy can be performed relatively easily.

  Further, in order to secure a space for accommodating a mechanism for sliding the master jaw 13, a cylindrical protruding portion that protrudes toward the table surface plate 3 from the surface on the table surface plate side of the chuck body 11 may be provided. The axis of this cylindrical protrusion is configured to coincide with the axis of the main shaft. Further, the table face plate 3 and the main shaft are formed with insertion holes through which the cylindrical protrusions are fitted. Thereby, the protrusion amount from the table surface plate 3 of the component attached to the table surface plate 3 can be made small.

  In the above embodiment, the case where the claw 12, the master jaw 13 and the engagement cutout 14 are three has been described. However, the claw 12, the master jaw 13 and the engagement cutout 14 are not limited to this. Two or more than four may be used.

  In the above embodiment, the case where the chuck is attached to the end portion of the main shaft via the table face plate has been described. However, the present invention is not limited to this, and the chuck may be directly attached to the end portion of the main shaft.

DESCRIPTION OF SYMBOLS 1 Chuck 2 NC table apparatus 3 Table surface board 11 Chuck main body 12 Claw 13 Master jaw 13a Guide protrusion part 13b Table surface board side protrusion part 14 Notch for engagement 14a Step surface 14b First opposing surface 14c Second opposing surface 80 NC table device 81 Table face plate 82 Adapter 90 Chuck 91 Chuck body 91a Fitting groove 91b Guide recess (guide groove)
91c Bottom 92 Master jaw 92a Guide convex part 93 Claw

Claims (3)

In an NC table device having a spindle,
A chuck fixed to an end of the main shaft and attached to a table face plate that rotates integrally with the main shaft, has a cylindrical shape, and has a plurality of engagement notches formed from the outer periphery toward the rotation center. The body,
Each of the engaging notches is slidably engaged, and the same number of master jaws as the engaging notches,
Each chuck is attached to each of the master jaws, and the chuck body includes a plurality of claws radially arranged from the center of rotation toward the outer circumferential direction on the surface opposite to the side on which the chuck body is attached to the table face plate. ,
The engaging notch has a surface that is attached to the table face plate of the chuck body and a surface opposite thereto, and the master jaw is attached to the table while the chuck body is attached to the table face plate. A chuck characterized by being in contact with a face plate. In an NC table device having a spindle,
A chuck body attached to the end of the main shaft, having a cylindrical shape, and having a plurality of engagement notches formed from the outer periphery toward the rotation center;
Each of the engaging notches is slidably engaged, and the same number of master jaws as the engaging notches,
A chuck that is attached to each of the master jaws and includes a plurality of claws radially disposed from the center of rotation toward the outer circumferential direction on a surface opposite to the side on which the chuck body is attached to the end of the main shaft. There,
The engagement notch has a surface open to an end portion of the main shaft of the chuck body and a surface opposite to the surface, and the master body is attached to the end portion of the main shaft. A chuck characterized in that a jaw is in contact with an end of the main shaft. The engagement notch has a pair of side walls extending from the outer periphery toward the rotation center in a state of being opposed to each other, and each side wall has a stepped surface facing the end portion of the table face plate or the main shaft, A first opposing surface extending from one side of the step surface toward a surface attached to the end of the main shaft of the chuck body; and a second opposing surface extending from the other side of the step surface toward the opposite surface. And the interval between the first opposing surfaces of both side walls is longer than the interval between the second opposing surfaces,
The master jaw has guide protrusions formed on surfaces corresponding respectively to the pair of side walls of the engagement notch,
3. The guide protrusion according to claim 1, wherein the guide protrusion is fitted into a space surrounded by the table face plate or the end of the main shaft, the first facing surface, and the step surface. The chuck described.

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