JPH11156670A - Grease circulation system for chuck with counter balance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grease circulation system for a chuck with a counter balance which can certainly feed grease, reduce rebelling work of grease, and efficiently consume grease. SOLUTION: A space 3 connected with a body 1 and a master jaw 2 is formed, a counter weight 4 is placed in the space 3 on the body 1 side slidably in the centrifugal direction, both end fixing parts 5A, 5B of a lever 5 placed in the space 3 are grabbed by the counter weight 4 and the master jaw 2, the space 3 from a fulcrum part 5C of the lever 5 to the counter weight side is used as a grease bank 15 in a chuck having a counter balance grabbed by the intermediate fulcrum part 5C and the body 1, a supply hole 12 passing from the grease bank 15 into a lever grabbing recessed part 6 of the counter weight 4 is provided for the counter weight 4, a through hole 13 passing to both end surfaces longitudinally to the lever 5, and a communicating hole 14 passing from inside of a lever grabbing recessed part 7 of the master jaw 2 to a grease delivering route 10 is formed in the master jaw 2. In addition, a passage 17 communicating each grease bank 15 can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grease circulation device for maintaining stable lubrication of internal parts in a counterbalanced chuck.

[0002]

2. Description of the Related Art In a chuck for holding a workpiece,
A counterbalanced check already exists. This counterbalanced zipper rotates as the joystick rotates,
It counteracts the centrifugal force generated in the pawl, and transmits a compensating force related to the rotation speed to the pawl via a lever provided in the main body of the chuck, thereby performing an action of holding the gripping force.

FIG. 3 shows an example of a conventional counterbalanced chuck, in which a space 3 connecting a body 1 and a master jaw 2 is formed, and a counterweight 4 is slidable in a centrifugal direction in a space on the body side. A lever 5 having locking portions 5A, 5B at both ends and a fulcrum portion 5C in the middle is installed in the space 3, and the locking portions 5A, 5B at both ends are provided.
Is a lever holding recess 6 provided on the counterweight 4,
The master jaw 2 is gripped by the lever holding recess 7 and the intermediate fulcrum 5C is held by a holding frame 8 formed in the space 3 of the body 1.

The lever 5 performs a seesaw motion with the sandwiched intermediate fulcrum 5C as a fulcrum, and the position of the counterweight 4 is longer. Accordingly, as the master jaw 2 fitted by the operation of the shifter 9 slides in the centrifugal direction, the lever 5 gripped by the gripping concave portion of the master jaw 2 is moved to the intermediate fulcrum 5.
Since it swings in the centrifugal direction about C as a fulcrum, there is no problem in the chucking action.

At the time of high-speed rotation of the cutting process, the centrifugal force causes the counterweight 4 to be centrifugally oscillated, and this force acts on the intermediate clamped fulcrum 5C as a fulcrum and on the locking portion 5B at the other end. Then, since the master jaw 2 is pressed toward the center, the gripping force is compensated against the centrifugal force of the chuck pawl due to the high-speed rotation.

On the other hand, in order to maintain the optimum performance of the chuck, it is necessary that the internal parts thereof be stably lubricated. Therefore, a grease supply passage 10 is formed in each master jaw 2 by drilling. An end is provided on each sliding surface with the shifter 9 and the body 1, and grease is supplied from each grease nipple 11 into each distribution path 10 to be filled, and lubrication is maintained by using sliding and rotation. It is.

[0007]

In the conventional grease supply described above, grease is unilaterally supplied to each sliding surface from each distribution path, and the supplied grease is applied to the sliding surface by centrifugal action or the like due to rotation. Either they are released and scattered from the outside of the chuck or remain in gaps between the internal parts and disappear.

Therefore, in order to maintain a normal gripping force of the chuck claws, grease is injected and supplied from each grease nipple every day. FIG. 4 shows the gripping force of the chuck claws and the grease. Is an example showing the replenishment of grease in relation to the operation time. Grease supply of 6 to 9 cc is required every 8 hours, and 84 to 126 cc of grease is consumed in 112 hours of operation.

SUMMARY OF THE INVENTION Accordingly, the present invention is to provide a grease circulating device for a counter-balanced hack that can reliably supply grease, reduce grease replenishment work, and can further efficiently consume grease. It is.

[0010]

SUMMARY OF THE INVENTION According to the present invention, a space connecting a body and a master jaw is formed, a counterweight is slidable in a space on the body side in a centrifugal direction, and a lever installed in the space is provided. Grip the space between the lever fulcrum and the counterweight side into a grease pool. The counterweight is provided with a supply hole leading into the lever holding recess of the counterweight, a through hole is provided on both ends in the longitudinal direction of the lever, and the communication hole leading from the inside of the lever holding recess of the master jaw to the grease supply path is master. It is characterized by being provided on the jaw, and it is also possible to provide a passage communicating with each grease reservoir. .

Since the grease passes from the grease reservoir through the supply hole, passes through the lever holding recess of the counterweight, passes through the through hole of the lever, passes through the lever holding recess of the master jaw, and further passes through the communication hole, and is led to the grease supply passage. Lubrication of each sliding surface with grease can be maintained.

[0012] Then, the well-formed counterweight provided in the grease reservoir acts as a pump by the reciprocating movement of the master jaw in the centrifugal direction for gripping / releasing the chuck claws, thereby forcing a predetermined amount of grease. As a result, the grease that has entered the gap between the internal parts from the sliding surface returns to the grease pool, and a part of the grease that does not scatter outside the chuck acts to circulate.

Further, since the grease reservoir is formed in the body, if the respective grease reservoirs are communicated, the grease replenishing operation can be performed with only one grease nipple.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional side view of a counterbalanced check showing an embodiment, and shows a body 1, a master jaw 2, a shifter 9, and a counterweight 4 installed in a space 3 connected to the body 1 and the master jaw 2. FIG.
It consists of the main parts.

A counterweight 4 is slidably provided in a rearward direction of the body 1 of the space 3 so as to be slidable in the centrifugal direction. And a supply hole 12 communicating with the space 3 and the lever holding recess 6.

A small holding frame 8 is provided near the master jaw 2 in the space 3 formed by the body 1, and a fulcrum 5 C located at an intermediate portion of the lever 5 near the master jaw is held. The locking portion 5A at one end is fitted into the lever gripping concave portion 6 of the counterweight 4 and the locking portion 5B at the other end.
Is held by a lever holding recess 7 which is a space 3 formed by the master jaw 2. The fulcrum part 5C and the locking part 5 at each end
A and 5B have a spherical surface and are slidable with the locking surface.

The body 1 according to the above description,
The configuration of the master jaw 2, the shifter 7, the space 3 and the lever 5, except for the supply hole 12 of the counterweight 4,
It is the same as the basic configuration of this type of counterbalanced chuck, and naturally has the same operation and effect.

The lever 5 locked by the holding frame 8 and the counterweight 4 of the body 1 and the lever holding recesses 6 and 7 of the master jaw 2 has through holes 13 communicating with both end surfaces. The jaw 2 is provided with a communication hole 14 communicating from the lever holding recess 7 to the grease supply passage 10 disposed in the master jaw 2.

The grease supply passage 10 has a multi-branch end for opening the inside of the master jaw 2 to each sliding surface in order to supply grease to each sliding surface as in the prior art. It is only the communication hole 14 and does not have a grease nipple or the like directly communicating with the outside of the check.

On the other hand, the space on the counterweight 4 side divided by the holding frame 8 of the space 3 and the fulcrum 5C of the lever 5 is used as a grease reservoir 15, and a grease nipple 16 communicating with the outside is provided to supply grease. There is.

Therefore, grease is supplied from the grease reservoir 15 to the supply passage 10 from the supply hole 12, the lever holding recess 6, the through hole 13, the lever holding recess 7, and the communication hole 14, and the centrifugal movement of the counterweight is performed by the pump. The grease is forcibly fed by a predetermined amount, and a part of the grease returns to the grease reservoir 15 through the gap between the internal parts and circulates, so that the grease can be reused.

As a result, under the same conditions as in FIG. 4 in the conventional grease supply device, the results are as shown in the table of FIG.
The replenishment every hour was sufficient, and the effect of suppressing the consumption of grease of 80 cc was obtained.

The grease nipples 16 for supplying grease to the grease reservoir 15 may be provided individually. However, since the grease reservoir 15 is formed in the body 1, a plurality of grease reservoirs 15 can communicate with each other. Passage 17
Is provided, the supply from the grease nipple 16 is sufficient.

[0024]

As described above, the present invention reliably supplies grease in a counterbalanced chuck and enables circulation of grease, thereby reducing the work of replenishing grease and achieving efficient consumption of grease. The effect that can be performed is exhibited.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a chuck showing an embodiment of the present invention.

FIG. 2 is a graph showing the state of grease replenishment of the present invention.

FIG. 3 is a vertical sectional side view of a conventional chuck.

FIG. 4 is a graph showing a state of conventional grease replenishment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Master jaw 3 Space 4 Counterweight 5 Lever 6 Lever gripping concave part 7 Lever gripping concave part 5A End locking part 5B End locking part 5C Support point part 8 Holding frame part 9 Shifter 10 Grease distribution path 11 Grease nipple 16 Grease nipple 12 Supply hole 13 Through hole 14 Communication hole 15 Grease reservoir 17 Passage

Claims (2)

[Claims] 1. A space connected to a body and a master jaw is formed, a counterweight is slidable in the space on the body side in a centrifugal direction, and both ends locking portions of a lever installed in the space are defined as a counterweight. In a counterbalanced chuck that is gripped by the master jaw and the middle fulcrum is clamped by the body, the space on the counterweight side from the fulcrum of the lever is used as a grease pool, and the grease pool is used to hold the counterweight in the lever gripping recess. The counterweight is provided with a supply hole leading to both ends of the lever in the longitudinal direction of the lever, and the master jaw is provided with a communication hole communicating with the grease supply passage from inside the lever holding recess of the master jaw. Grease circulation device with a counterbalanced chuck. 2. The grease circulating device for a counterbalanced check according to claim 1, further comprising a passage communicating with each grease reservoir.