JPS624407Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cam-type chuck that clamps a workpiece and transmits rotation.

Conventionally, a rotary plate equipped with a floating plate is rotated relative to a driving face plate by a fluid pressure cylinder installed on a fixed part such as a headstock, and a rotary plate provided with a floating plate is rotated in three equal parts on the circumference. The workpiece can be tightened by two support bolts that can protrude inward at two adjacent positions, and a tightening cam at the remaining position that is pivoted by a support pin and has an inward cam surface. In addition, when the floating plate is unclamped, a chuck is provided in which the workpiece is inserted and pulled out in a direction that does not interfere with the workpiece when the floating plate is unclamped. The gap between the support bolt and the tightening cam is obtained only by the gap between the tightening cam and the workpiece, so the gap between the support bolt and the workpiece is created by the floating plate falling downward under its own weight. It has gained. Therefore, depending on the stop position of the spindle, there may be no gap, resulting in problems such as difficulty in inserting a workpiece during unclamping.

For this reason, there are some models in which the floating plate is engaged with an engaging protrusion, and the floating plate is swung using the engaging protrusion as a fulcrum to separate the pair of support bolts from the workpiece. It is used.

However, in such a chuck, since the floating plate is swung by a spring, for example, if the sliding resistance of the guide portion of the floating plate is large, the floating plate may not swing smoothly due to the spring. , there was a risk that the support bolt could not be reliably separated from the workpiece.

The present invention has improved the above-mentioned conventional problems, and its feature is that the floating plate having the support bolt and the tightening cam is swingable, and the movement of the unclamping actuating device is reduced during unclamping. The present invention provides a cam-type chuck which secures a gap with the workpiece by forcibly displacing the floating plate in the radial direction away from the workpiece using the support bolt.

Embodiments of the present invention will be described below with reference to the drawings.
In FIGS. 1 and 2, 1 is a headstock, which is fixed on a table 36. 2 is a center mounted on the headstock 1; A shaft portion 3 concentric with the axis of the center 2 is formed on the headstock 1, and this shaft portion 3
A pulley 4 is rotatably supported through a bearing 5. A driving face plate 6 is fixed to the side surface of the pulley 4, and a plurality of support plates 7 are superposed and integrally fixed to the driving face plate 6. A support plate 8 having sawtooth teeth 9 formed on its outer periphery is fixed to the support plate 7. Further, between the support plate 8 and the support plate 7, a rotary plate 10 having serrated teeth 11 formed on the outer periphery in a direction opposite to the teeth 9 of the support plate 8 is rotatably supported. There is. This rotating plate 10 and support plate 8
There is a spring 1 that pulls in the direction of relative rotation between the
2 is stuck.

A ring-shaped floating plate 13 is held on the surface of the support plate 8 opposite to the rotary plate 10, that is, on the front surface of the support plate 8, so as to be swingable about the center 2. The holding structure of this floating plate 13 is such that a holding ring 21 is fixed to the front part of the support plate 8.
It has a structure in which a circular engaging member 21 integrally connected to the floating plate 13 is held swingably.

The floating plate 13 has a diameter of about 3 on its circumference.
Two support bolts 14 protrude inward at two equally spaced adjacent positions, and a support pin 16 at the remaining one position.
The cam member 15 has a cam surface 15a on the inside and a long hole 17 on the outside. A drive pin 18 protruding from the support plate 8 is engaged with the elongated hole 17.

Further, an arm 19 is provided protruding from the floating plate 13, and a tension spring 20 is latched between the arm 19 and the cam member 15.
Further, a contact member 25 that contacts this arm 19 and rotates the floating plate 13 is connected to the rotating plate 10.
more prominent.

an engaging member 2 that is integral with the floating plate 13 and is swingably held by a retaining ring 22;
A guide mechanism is provided between 1 and the support plate 8. This guide mechanism consists of a pair of engagement grooves 23 and a pair of engagement pins 24 that engage with each other, and the engagement pins 24 are implanted in the support plate 8. is formed. As shown in FIG. 3, this guide groove 23 extends along a circumferential line _C1 centered on the center axis,
It gradually slopes in a direction away from the circumferential line C ₁ from the middle, and at the end it is l relative to the circumferential line C ₁ .
It is formed by being biased inward or outward.

Therefore, when the floating plate 13 is rotated, the guiding action of the guide groove 23 causes the floating plate 13 to be displaced in the direction of the arrow in FIG. It's summery.

In the above structure, 20 is a spring that applies a tensile force between the fixed pin 50 on the support plate 8 and the fixed pin 51 on the rotating plate 10,
5 to one end of the long groove 55. Further, by rotating the cam member 15 around the support pin 16 by the tensile force of the spring 20, the workpiece W supported on the center 2 is moved by the support bolt 14 and the cam member 15 as shown in FIGS. As shown in FIG. 2, the pulley 4 is automatically centered and clamped, and the rotation of the pulley 4 is transmitted to the workpiece W via the drive face plate 6, support plate 8, drive pin 18, and cam member 15. Unclamping is achieved by relatively rotating the support plate 8 and the rotating plate 10 against the spring 12. 26 is this unclamp actuating device.

The unclamp device 26 has the following configuration. A rotating plate 1 is attached to the tip of an operating shaft 27 that moves forward and backward by a fluid pressure cylinder 37 fixed to the headstock 1.
The operating pawl 32 that engages with the tooth 11 of 0 is the pivot pin 33.
The tooth 11 is pivoted by a spring 34.
It is pressed to pivot in the direction of engagement.
Reference numeral 35 designates a fixing pin protruding from the mounting block 30 that is integrated with the headstock 1, and is engaged with the operating pawl 32, so that the actuating pawl 32 is moved against the pressing force of the spring 34 at the end of the backward movement of the operating shaft 27. Tooth 1 of rotating plate 10
1, and when the actuating shaft 27 moves forward, the spring 34 allows a pressing turning movement to engage the actuating pawl 32 with the teeth 11 of the rotating plate 10.

Furthermore, an engaging pawl 28 that engages with the teeth 9 of the support plate 8 is pivotally supported on the mounting block 30 by a pivot pin 29, and is pressed by a spring 38 to pivot in the direction of engagement with the teeth 9. are doing. A contact surface 31 is formed on this engagement claw 28, and a pivot pin 33 for pivotally supporting the operating claw 32 is formed on this contact surface 31.
When the actuating shaft 27 moves backward, the engaging pawl 28 is moved by the pivot pin 33 to the teeth 9 of the support plate 8.
The actuating shaft 2
7, the structure is such that the engaging claw 28 is allowed to be pressed and pivoted by the spring 38 so as to engage the teeth 9 of the support plate 8. Furthermore, the operating shaft 27
With the forward movement of , the engaging pawl 28 engages the teeth 9 of the support plate 8 , and then the operating pawl 32 engages the teeth 11 of the rotating plate 10 .
It is something that engages with.

Next, to explain the operation of the device of the present invention, the workpiece W
When the machining is completed, the rotation of the motor (not shown) is stopped, and the rotation of the drive face plate 6 is stopped. After the driving face plate 6 stops rotating, the unclamp actuating device 26 is activated. That is, the hydraulic cylinder 37 moves the operating shaft 27 forward. This allows pivot pin 3
3 and the contact surface 31 disengage, the engagement claw 28
is pivoted toward the support plate 8 using the pivot pin 29 as a fulcrum by the pressing force of the spring 38, and engages with the teeth 9 of the support plate 8 to restrain rotation of the support plate 8. Thereafter, the operating pawl 32 pivots toward the rotating plate 10 using the pivot pin 33 as a fulcrum due to the pressing force of the spring 34, engages with the teeth 11 of the rotating plate 10, and rotates the operating shaft 27.
The rotating plate 10 is rotated by the amount of movement to the stroke end in the forward direction. Therefore, the support plate 8 and the rotating plate 1
It will rotate relative to 0. This rotating plate 10
As a result of the rotation, the abutting member 25 protruding from the rotating plate 10 comes into contact with the arm 19 fixed to the floating plate 13, and the floating plate 13 is rotated counterclockwise in FIG. move. By the counterclockwise rotation of the floating plate 13, the support pin 16 that pivotally supports the cam member 15 is also rotated in the same direction. Therefore, the cam member 15 protrudes from the support plate 8 whose rotation is restrained, and rotates clockwise about the drive pin 18 engaged with the elongated hole 17 of the cam member 15, so that the cam surface 15a is rotated. A gap is formed away from the workpiece W, and the workpiece W is unclamped.

Simultaneously with this unclamping by the cam member 15, the counterclockwise rotation of the floating plate 13 causes the engaging member 21 integral with the floating plate 13 to also rotate in the same direction. That is, it rotates relative to the support plate 8 whose rotation is restricted. This rotation of the engaging member 21 in the counterclockwise direction causes the support plate 8 to
The engaging pin 24 that protrudes more and the engaging groove 2 provided in the engaging member 21 that is engaged with the engaging pin 24
3, the engaging member 21 is displaced in the radial direction, as shown by the arrow in FIG. The support bolt 14 that was in contact with the workpiece W is forcibly separated from the workpiece W by swinging in the direction to form a gap. Therefore, when unclamping, no matter where the drive face plate 6 is stopped, the center 2
The outer periphery of the workpiece W supported by the support bolt 1
4 and the cam surface 15a of the cam member 15, making it easy to pull out the processed workpiece W and insert the unprocessed workpiece W.

To clamp the unprocessed workpiece W supported on the center 2, the operating shaft 27 is moved backward and the operating claw 3
2 is disengaged from the teeth 11 of the rotating plate 10.
As a result, the rotating plate 10 rotates relative to the support plate 8 whose rotation is restrained due to the tensile force of the spring 12 in the opposite direction to that at the time of unclamping, and the abutting plate 10 that was in contact with the arm 19 The member 25 rotates clockwise and separates from the arm 19, and the tension of the spring 20 causes the floating plate 13 to rotate clockwise. Due to the clockwise rotation of the floating plate 13, the guide member 21, which had been displaced in the radial direction by the guiding action of the engagement groove 23 and the engagement pin 24, becomes free, and at the same time, the cam member 15 releases the spring 20. The tensile force rotates counterclockwise about the support pin 16, and the cam surface 15a comes into contact with the workpiece W. When the cam surface 15a comes into contact with the workpiece W, the floating plate 13 swings so that the support bolt 14 comes into contact with the workpiece W, and the support bolt 14 is attracted to the workpiece W, so that the two support bolts 14 The floating plate 13 is automatically centripeted by the three points of the cam member 15 and the single cam member 15, and the workpiece W is clamped.

At the time when this clamping is completed, the engagement claw 28 disengages from the teeth 9 of the support plate 8, the rotation restraint of the support plate 8 is released, and the rotation of the pulley 4 is transferred to the suspension face plate 6, the support plate 7, and the support plate. 8. Drive pin 18 and cam member 15
The signal is transmitted to the workpiece W through the rotor to drive the workpiece W to rotate. In the above embodiment, the engagement groove 23 is formed on the engagement member 21 side, and the engagement pin 2 is formed on the support plate 8 side.
4 is provided, but the present invention is not limited to this, and the engagement pin 24 may be fixed to the engagement member 21 side, and the engagement groove 23 may be formed on the support plate 28 side.

Furthermore, the formation positions of the pair of engagement grooves 23 are not limited to those in the embodiment described above, and as shown in _{FIG .}
A pair of engagement grooves 23 may be formed on the top. When formed in such a position, the pair of guide grooves 23
is inclined with respect to the circumferential line C ₁ centered on the center axis O ₁ .Similar to the embodiment described above, by rotating the floating plate 13 , the floating plate is rotated by the action of the guide groove 23 . 13 can be displaced in the direction of the arrow in FIG.

As described above, according to the present invention, the cam member forms a gap with the workpiece during unclamping, and the floating plate having the cam member and the support bolt is forcibly displaced in the radial direction to move the support bolt away from the workpiece. Because it separates and forms a gap,
No matter what position the driving face plate stops at, the floating plate will no longer fall under its own weight and the supporting bolts will come into contact with the workpiece, eliminating the gap as in the past.
Since the workpiece can be easily pulled out and inserted, and the floating plate is forcibly displaced using the motion of the unclamping actuating device, there is no need to provide an extra special actuating device.
Moreover, it has the advantage that the floating plate can be reliably displaced regardless of some sliding resistance, and the operation is reliable.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional plan view of the main part of the present invention, Fig. 2 is a partial sectional view taken in the direction of the arrow in Fig. 1, Fig. 3 is a sectional view taken along the line shown in Fig. 1, and Fig. 4 is a sectional view taken in the direction of the arrow in Fig. 2. 5 are sectional views taken along the line of FIG. 1, showing other embodiments of the guide mechanism. 1... Headstock, 2... Center, 4... Pulley,
6... Drive face plate, 8... Support plate, 9... Teeth, 10
... Rotating plate, 11 ... Teeth, 13 ... Floating plate, 14 ... Support bolt, 15 ... Cam member, 1
6...Support pin, 17...Elongated hole, 18...Drive pin, 19...Arm, 20...Spring, 21
...Engagement member, 23...Engagement groove, 24...Engagement pin, 25...Abutting member, 26...Unclamp actuating device, 27...Operating shaft, 28...Engagement claw, 29
... Pivotal pin, 31 ... Contact surface, 32 ... Operating claw, 33 ... Pivot pin, 35 ... Fixed pin, 37
...Fluid pressure cylinder.

Claims (1)

[Scope of utility model registration request] A support plate that is provided on the side of a pulley that is rotatably supported on the headstock concentrically with the axis of a center fixed to the headstock and has serrated teeth on the outer periphery, and a relative rotation on one side of the support plate. a rotary plate that is pivotably supported and has serrations on its outer periphery in a direction opposite to the teeth of the support plate;
A floating plate held on the other side of the support plate so as to be able to swing around the center, and a floating plate approximately 3 inches above the circumference so as to support a workpiece on the floating plate.
a cam member having two support bolts protruding inward at two equally spaced adjacent positions and a cam member pivotally connected by a support pin at the remaining one position and having a cam surface on the inside and a long hole on the outside; a drive pin that protrudes from the support plate and engages with an elongated hole of the cam member; a contact member that protrudes from the rotation plate and contacts an arm fixed to the floating plate to rotate the floating plate; A tension spring tensioned on the arm and the cam member, an engagement groove formed on one end surface of the floating plate or the support plate so as to be inclined in a direction away from a circumferential line centered on the center axis; It is composed of an engaging pin attached to the other of the floating plate or the support plate, and the engaging groove is engaged with the engaging pin, and as the floating plate rotates, the angle formed by the pair of support bolts is a guide mechanism that displaces the floating plate in a substantially intermediate angular direction; an engaging pawl that engages with teeth of the support plate to restrain rotation of the support plate; and a guide mechanism that engages with the teeth of the rotation plate. A cam-type chuck equipped with an unclamp actuating device having an actuating pawl that rotates a rotating plate.