JPS6348367Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chuck device that can clamp and hold a workpiece with claws and perform drilling or other cutting operations with a cutting tool during automatic lathe work.

In general, with this type of equipment, if the chuck force is unstable during chuck work, especially when chucking or re-chucking, there is a risk of a decrease in machining accuracy and a number of defective products, as well as damage to tools and component parts. This cannot be avoided, so it is necessary to make the chuck strong, but in the conventional type, the chuck part moves during work, making the configuration extremely complicated, expensive, and prone to slipping with the workpiece during work. It is quite difficult to prevent removal over a long period of time, and since the gripping position is limited due to the structure, other operating mechanisms and machining timing alignment are complicated, and machining after a certain period of time is relatively time-consuming. This was an inconvenience that caused a decline in productivity. Furthermore, when the workpiece to be tightened into the chuck is supplied to the chuck, it is inserted at a predetermined position and is not chucked at the same position all the time, resulting in irregularities and deviations in the machining position of the cutting tool, resulting in uneven products. There were drawbacks such as a decrease in accuracy and the extremely complicated inspection and selection process.

The purpose of the present invention is to easily eliminate these conventional drawbacks, and it has a simple structure that makes the grip strong and accurate, and also prevents chuck from becoming unstable during the chuck operation. It maintains good retention of the workpiece, and ensures chucking at precisely aligned and uniform positions, making it possible to perform dimensionally delicate machining with good accuracy, and these adjustments can be made easily and quickly, improving work efficiency. The present invention is intended to present a chuck device that can be significantly improved.

In the present invention, the chuck part A, which is composed of a claw body 1 that chucks the workpiece M, an operating rod 2 that rotates the claw body 1, and an auxiliary lever 21 that opens and closes the claw body ₁ , is located at the position of the main shaft S. In a chuck device that is moved to a processing position D to perform drilling or milling, etc., the operating rod 2 is provided on a mounting member 3, and the claw body 1 is moved by the mounting member 3 and fluid pressure.
A drive unit 4 for opening and closing the shaft is provided on the shaft 6, and the shaft 6
is supported so as to be slidable in the axial direction and pivotable in the radial direction, and the operating rod 2 is rotated by a transmission mechanism 5 provided on the shaft 6, and the claw body 1 is rotated by the rotating movement of the operating rod 2. a mounting portion ₇₁ having a push-in body 7 urged by a spring ₇₄ and facing a stopper ₁₃ protruding within the chuck pawl body 1 at a central movement path position;
This chuck device for an automatic lathe is characterized in that a push-in positioning part B consisting of a bracket ₇₃ provided on the mounting part ₇₁ via a positioning piece ₇₂ is provided.

An embodiment of the present invention will be described with reference to the drawings.

The chuck part A consists of a claw body 1 for chucking the workpiece M and a cylindrical case ₁₂ that slidably accommodates the claw body 1, and is attached to the end of the operating rod 2. The claw body 1 is a split body made of a spring material that forms a cylindrical inner surface and a tapered outer surface that follows the tapered inner surface of the case 1 ₂ whose opening side is enlarged when the claw body ₁ is housed in the case 1 2 , and will be described later. A collar ₁₁ is provided as a drive transmission section from the drive section 4. A stopper ₁₃ is provided on the collar ₁₁ so as to protrude into the hollow part of the claw body.

The operating rod 2 has an annular base, and a mounting member 3 is attached to the shaft 6.
However, the diameter of the hole in the operating rod 2 into which the mounting member 3 is inserted is made larger than the outer diameter of the mounting member 3 to be inserted into the hole, so that the operating rod 2 can be attached to the protruding base of the operating rod 2. The inner surface of the annular base of 2 and the mounting member 3
The gap d between the mounting member 3 and the outer circumferential surface of the mounting member 3 can be adjusted, and the mounting member 3 is fastened to a flange portion ₃₁ provided at an appropriate position. The mounting member 3 is fixed to rotate together with the shaft 6.

A stopper rod 2 ₂ is protruded from the annular base of the operating rod 2 at _an appropriate angle.
and an adjustment bolt 2 at each end of the operating rod 2.
₃ ′, 2 ₃ are attached.

The shaft 6 is a hollow shaft supported by bearings 6 ₁ and 6 ₁ provided on the main body, and is provided with a pinion gear 5 and a spring 5 ₃ as a rotational transmission mechanism on its outer surface. The spring ₅₃ is stretched between a support rod ₅₅ protruding from the main body and a wire ₅₆ fixed to a wire attachment wheel ₅₄ that is continuous with the cylindrical body of the pinion gear 5 so as to be able to be wound thereon.

The pinion gear 5 is connected to the cam C via a lever ₅₂ having a sector gear ₅₁ . Lever 5 ₂
The cam C side of the lever _{52' is connected to a lever 52} ' having a pin portion that directly contacts the cam C via a spring member ₅₃ .

A spring 82 is disposed between the main body and a cylindrical body having a pinion gear 5 and a wire attachment wheel ₅₄ and fixed to the shaft 6, and a lever ₈ is further provided on the outer surface of the shaft 6.
A collar 8 ₁ is fixedly connected to the cam 9 via a collar 8 1 and constitutes a sliding drive for the shaft 6 .

The shaft 6 also slidably accommodates a rod ₄₅ therein, and a collar ₄₆ is provided at the end of the rod ₄₅ that protrudes outward from the shaft 6 on the side to which the mounting member 3 is attached. There is. This collar ₄₆ and the collar ₁₁ of the chuck portion A are connected by an auxiliary lever ₂₁ . The other end of the rod ₄₅ is connected to a piston ₄₁ that slides in a cylinder ₄₂ fixed to the other end of the shaft 6, and the cylinder ₄₂ has a flow passage ₄₃ , which is connected to a source of pressurized air. 4 ₄ is provided, and the drive section 4 for opening and closing the chuck section A is constituted by an air cylinder.
The air cylinder is connected to a solenoid valve (not shown) controlled by a cam.

The auxiliary lever ₂₁ is pivotally supported by a pin ₂₅ to a protrusion ₂₄ provided on the operating rod 2 at a portion of the lever near the collar ₁₁ , and is connected in a lever manner using this as a fulcrum.

The main axis S and the machining position D are arranged on a curved surface formed by the movement of the locus formed by the chuck center axis of the chuck part A in the direction of the axis 6 by the rotation of the operating rod 2 due to the rotation of the axis 6. However, a push positioning portion B for the workpiece M is provided on the curved surface.

This pushing positioning part B is provided with a pushing body with a rod slidably attached to the mounting part ₇₁ attached to the main body via a bracket ₇₃ , and a spring ₇₄ wound around the rod.
It is arranged parallel to the shaft 6 so that it can be protruded and retracted, and its pushing abutting end surface is formed into a flat surface. The bracket 7 ₃ is attached to the main body of the processing tool 13 via a long groove 7 ₅ and can be adjusted in the axis 6 direction, and the mounting portion 7 ₁ is attached to the bracket 7 ₃ at an appropriate rotational position with a bolt 7 serving as a positioning piece. ₂ , and the distance from the shaft 6 (in the radial direction) can be adjusted.

In the figure, reference numeral 10 denotes a stopper plate for regulating the stop position of the operating rod 2 at the main axis S and processing position D, and is provided at an appropriate position on the main body so as to protrude to a position where it can come into contact with the adjustment bolts 2 ₃ and 2 ₃ ′. It will be done. Reference numeral 11 is a camshaft connected to a drive section (not shown). 12 is an O-ring. Reference numeral 13 denotes a processing tool at the processing position D, such as a drilling device or a milling device shown in FIG. Briefly referring to FIG. 6, the shaft 13 ₁ and the pulley 13 ₂ are connected via a key 13 ₃ , and the shaft 13 ₁ is slidable relative to the pulley 13 ₂ and rotatably connected via a bearing. It is incorporated into the sleeve ₁₃₄ . The sleeve ₁₃₄ is connected to the lever ₁₃₆ via the plate ₁₃₅ , and the lever 1 resists the spring ₁₃₇ of the plate ₁₃₅ .
When the shafts 13 _{and 13} move, the shafts 13 _{and 1} also move together (go and go). 13 ₇ is a spring for reverse movement (go-around), 13 ₈ is an integrated fixed unit, 1
₃₉ is a belt, ₁₃₁₀ is a guide rod. In this case, since the pulley 13 ₂ is supported by the unit 13 ₈ with a bearing, the movement of the shaft 13 ₁ is not affected by tension. The lever ₁₃₆ communicates with the cam on the camshaft 11.

After the operating rod 2 is pivoted onto the main shaft S to which the workpiece M is supplied, the rod ₄₅ is pushed out by the drive unit 4, and the workpiece M is moved into the jaw with the claw body 1 expanded. The workpiece M is inserted into the jaw by pushing the operating rod 2 forward toward the workpiece M by moving the shaft 6, and the workpiece M cut by the tool is pulled into the jaw by retracting the rod ₄₅ . The body 1 is stored and held in the case ₁₂ . At this position, the degree of protrusion is adjusted so that the adjusting bolt 2 ₃ ' protruding from the stopper rod 2 ₂ comes into contact with the stopper plate 10, thereby making the rotation stop position accurate.

Further, the turning radius _r1 of the chuck portion A is aligned by adjusting the gap d in FIG. The rear shaft 6 is rotated counterclockwise in FIG. 2 using the cam C, the lever 5 ₂ , the sector gear 5 ₁ and the pinion gear 5 to rotate the operating rod 2 . At this time, in FIG. 8, the wire ₅₆ is wound around the wire mounting wheel ₅₄ and the spring ₅₃
is pulled and stores a restoring force that rotates the shaft 6 clockwise.

The turning is temporarily stopped at a position of a push-in positioning part B provided in the turning path leading to the machining position D of the chuck part A. That is, the operating rod 2 is stopped at a position where the end faces of the pushing body 7 and the workpiece M are opposed to each other, and after the holding force of the workpiece M is slightly loosened by a slight push of the rod ₄₅ , the shaft 6 is Move the cam 9, lever 8, and collar 8 ₁ to the left in FIG.
The workpiece M is pushed in by the pushing body 7 until its end face hits the pad ₁₃ . With the end face of the workpiece M in contact with the stopper ₁₃ , retract the rod ₄₅ and remove the workpiece M.
is completely maintained. Thereafter, the spring ₈₂ is restored and the shaft 6 is returned to the right in FIG. 2, and begins to rotate again to the machining position D.

At processing position D, the adjustment bolt 2 of the operating rod 2
₃ is adjusted so that it comes into contact with the stopper plate 10.

After finishing the machining at the machining position D, the rod ₄₅ is pushed out, the claw body 1 is expanded, and the workpiece M is dropped and collected.

The shaft 6 rotates clockwise as the spring ₅₃ restores its original state, returning the operating rod 2 to the main axis S.

That is, in the push-in positioning part B, as shown in FIG. 9, after cutting off the workpiece M with the parting tool E located on the main shaft S, the workpiece M is tentatively chucked by the claw body 1 of the chuck part A. From (FIG. 9a), it is moved to the pushing body 7 using the operating rod 2 and stopped at the pushing positioning position (FIG. 9b). Next, the pawl body 1 in the case ₁₂ is pushed open by the auxiliary lever ₂₁ through the collar ₁₁ , and at the same time, the stopper ₁₃ is brought into contact with the workpiece M and pushed out, and the pusher body 7 is pressed against the spring ₇₄ . After being pressed against it (FIG. 9c), the claw body 1 retreats and chucks the workpiece M (FIG. 9d).
Then, the operator retreats away from the pushing body 7, pushes out the claw body 1 at a predetermined position, and discharges the loosened workpiece M from the claw body 1 by supplying oil from the cutting oil nozzle F (FIG. 9e).

The axis alignment of the pushing body 7 and the workpiece M can be done by tightening and fixing the pushing body 7 at any position on the radius r ₂ centered on the bolt 7 ₂ in Fig. 2, so the radius
This is done by positioning the pushing body 7 on _r1 and tightening and fixing it. In addition, to explain an example of the process of back-drilling the workpiece M, as shown in FIG. 10a), the chuck part A is moved back enough to avoid other tools G (Fig. 10b), and then the chuck is opened by placing it opposite to the pushing body 7 of the pushing positioning part B (Fig. 10b). 10 c), and the pusher 7
Dimensions are determined by pressing the chuck and closing the chuck (first step).
Figure 0 d). Next, release it from the pushing body 7 (Fig. 10e)
From there, the workpiece M is placed opposite to the machining position D of the drill, and is abutted against the stopper H for machining (FIG. 10f). Then release it from the stopper H (Fig. 10g)
Afterwards, the processed workpiece M is discharged by opening the chuck (Fig. 10h).

Next, the chucking part A is moved to a position opposite to the main shaft S using the operating rod (Fig. 10i), and the workpiece M led out from the main shaft S is inserted into the claw body 1. (FIG. 10j), it can be kept firmly attached to the chuck portion A, and the process of processing with the cutting tool can be repeated.

According to this embodiment, since the turning radius r ₁ can be adjusted even by using the integrally formed operating rod 2, the operating rod 2
Since the sliding of the shaft 6 and the opening/closing of the claw body 1 are independent of each other, there is no need to design and manufacture an extra lever or a difficult cam for separate operations. can.

In addition, since the workpiece M can be pushed linearly in the axial direction with the pusher 7 and held accurately,
The accuracy of tracking can be further improved.

Furthermore, the shaft 6 has no notched grooves and there is no unstable chucking force caused by chips.

In this embodiment, when attaching the operating rod to the mounting bracket 3, the turning radius _r1 can be adjusted by adjusting the gap d. Operating rod 2 is installed eccentrically with respect to the
The radius r ₁ can also be adjusted by connecting the mounting bracket 3 so that it protrudes from an appropriate radial position on the outer periphery of the mounting bracket 3 .

Furthermore, it goes without saying that a hydraulic cylinder other than an air cylinder can be used as the drive unit 4. Furthermore, it is also possible to provide the drive unit 4 in a fixed manner, but in that case, the sliding of the shaft 6 will affect the opening and closing of the claw body 1, so a mechanism to avoid this is required. Become.

This invention enables accurate chuck work during cutting during automatic lathe work, maintains strong gripping action until the end of machining without causing chuck variations during machining, and improves machining accuracy. In addition, the timing of chucking is greatly reduced, which improves work efficiency.Moreover, the chuck tightening force can be strengthened with the lever for controlling chuck opening and closing, and the movement of the chuck part is also restricted. The configuration can be simplified without any problems, and the grip position can be adjusted to any position, eliminating the complexity of timing adjustment in configuration or work, making it easy to handle and versatile. It can be used adaptively for various machining operations, and in addition, it is easy to shorten the time required for chuck work, and each task can be carried out efficiently. Furthermore, especially in the present invention, the position of the workpiece to be chucked by the chuck is always aligned and corrected at the same position, so that there is no shift in the machining position with the tool, improving product accuracy and fine machining. In addition, it is possible to easily prevent tool breakage and damage to each component, and to maintain reliable positioning and stable machining without having to create a complicated configuration to accurately feed the workpiece to the chuck. There are effects such as being able to.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partially cutaway plan view, Fig. 2 is a front view, Fig. 3 is a partially cutaway plan view, and Fig. 4 is a cutaway front view along the line of Fig. 3. , FIG. 5 is a front view cut along the line of FIG.
Figure 6 is a vertical sectional view along the line of Figure 2;
The figure is a longitudinal sectional view taken along the line in Figure 2, and Figure 8 is a front view of the arm return mechanism. 9A to 9E are explanatory views of the operation of the push-in positioning portion B, and FIGS. 10A to 10J are process explanatory views of processing examples. A...chuck part, B...pushing positioning part, C
...Cam, D...Machining position, S...Spindle, M...
Workpiece material, 1... Claw body, 2... Operating rod, 3... Mounting member, 4... Drive unit, 5... Pinion gear, 6
...Main shaft, 7...Press body, 8...Lever, 9...
cam.

Claims (1)

[Claims for Utility Model Registration] (1) A claw body 1 that checks the workpiece M and the claw body 1
In a chuck device for performing drilling or milling by moving a chuck part A, which is composed of an operating rod 2 that pivots and an auxiliary lever ₂₁ that opens and closes a claw body 1, from the position of the main shaft S to a processing position D, The operating rod 2 is provided on a mounting member 3, and the mounting member 3 and a drive unit 4 for opening and closing the pawl body 1 by fluid pressure are provided on a shaft 6, and the shaft 6 is slidable in the axial direction. The operating rod 2 is rotatably supported in the radial direction by a transmission mechanism 5 provided on the shaft 6, and the operating rod 2 is pivoted at the center of the pawl 1 at the movement passage position. A stopper 1 protruding inside the claw body 1
A mounting portion 7 ₁ having a pusher body 7 facing ₃ and biased by a spring 7 ₄ , and a positioning piece 7 attached to this mounting portion 7 _{1 .
1.} A chuck device for an automatic lathe, characterized in that a push positioning part B is provided with a bracket ₇₃ provided through a bracket 73. (2) A utility model registration claim in which the mounting member 3 is a cylindrical body with a flange portion ₃₁ , and is fitted into the fitting hole of the operating rod 2 with a gap d on the circumferential surface. The chuck device according to item 1. (3) The drive unit 4 is composed of a piston 4 ₁ provided at one end of the shaft 6 and a cylinder 4 ₂ into which the piston 4 is slidably fitted, and a flow path 4 that is connected to a pressure air source and supplies and discharges air. The chuck device according to claim 1 or 2 of the utility model registration claim, which is an air cylinder equipped with ₃ and ₄ .