JP2000126994A - Indexing lock mechanism in indexing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obviate a worm gear mechanism, and to reduce weight by providing a lock pin having an eccentric head on the tip, and locking a rotary table on an indexing position by rotating the eccentric head by making the eccentric head of the lock pin enter an indexing hole of the rotary table. SOLUTION: Marks 31g, 12d are adjusted, the guide part 31d of a lock pin 31 is inserted into a bush of a guide hole 12a, and when the lock pin 31 is rotated by a prescribed angle in the clockwise direction through an operation lever 32, an eccentric head 31a turns in the bush of an indexing hole 21a, so that a rotary table 20 is rotated by an eccentric quantity of the eccentric head 31a. That is, the rotary table 20 is pressed to the base 10 side through the eccentric head 31a by rotation of a microscopic turning angle of the lock pin 31, and the under surface of the main body part 21 is brought into close contact with a base 10, so that the rotary table 20 is locked. The lock pin 31 for releasing this lock is inversely rotated up to a former position to extract the lock pin 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indexing lock mechanism in an indexing device capable of simplifying the entire structure and reducing the weight.

[0002]

2. Description of the Related Art When drilling or cutting a work, an indexing device is sometimes used to position and index the work at an arbitrary rotational position.

[0003] A conventional indexing device is constructed by mounting a rotary table on a suitable base, and the base incorporates a worm gear mechanism for driving the rotary table. Therefore, in this apparatus, by setting the rotary table at an appropriate indexing position via the worm gear mechanism, the workpiece on the rotary table can be correctly positioned and indexed at an arbitrary rotational position.

[0004]

The problem with the prior art is that the worm gear mechanism requires a large number of parts and has a complicated structure, so that the overall weight increases and the product cost tends to be excessive. was there.

[0005] In view of the above-mentioned problems of the prior art, the object of the present invention is to adopt a lock pin with an eccentric head, thereby simplifying the structure, reducing the overall weight, and reducing the product cost. An index locking mechanism in an indexing device is provided.

[0006]

According to a first aspect of the present invention, there is provided a lock pin having an eccentric head at an end thereof, and the lock pin rotates the eccentric head through a guide hole of a base. The gist of the invention is to enter the indexing hole of the table, rotate the table, and lock the rotary table at the indexing position.

The lock pin can be locked by driving the rotary table toward the base via the eccentric head.

Further, a stopper portion is formed on the lock pin, and the stopper portion can define a maximum depth at which the eccentric head enters the index hole.

Further, an operation lever may be attached to the lock pin, and the operation lever may be set at an arbitrary rotation angle with respect to the lock pin.

[0010] A restricting member for restricting the rotary table to an arbitrary indexing position may be attached to the base.

[0011]

According to the structure of the present invention, the lock pin having the eccentric head is moved into the index hole of the rotary table through the guide hole of the base, and is rotated by rotating the eccentric head. Can be locked. The index hole of the rotary table is formed at a predetermined angle in the radial direction of the rotary table with respect to the outer peripheral surface of the rotary table, and the inner diameter of the index hole is set slightly larger than the diameter of the eccentric head. It is assumed that
Therefore, the lock pin makes the eccentric direction of the eccentric head substantially coincide with the rotating direction of the rotary table, and allows the eccentric head to enter the index hole through the guide hole of the base, and then rotate the entirety into the index hole. By rotating the eccentric head, the rotary table can be locked such that the eccentric head slides on the inner surface of the index hole.

The lock pin is such that the diameter of the guide portion except for the eccentric pin at the tip is adapted to the guide hole, and the guide hole is formed at a position where each index hole sequentially corresponds when the rotary table is rotated. It is assumed that The lock pin can rotate the eccentric head in the opposite direction to separate it from the inner surface of the index hole and remove it from the index hole and the guide hole, so that the rotary table can be rotatably released.

The lock pin can be locked by bringing the rotary table into close contact with the base by driving the rotary table to the base side via the eccentric head. At this time, the lock pin is necessary for the rotary table. A sufficient restraining force can be easily realized.

Since the stopper formed on the lock pin defines the maximum depth at which the eccentric head enters the index hole,
There is no danger that the eccentric head will penetrate into the index hole more deeply than necessary, and that the eccentric head will inadvertently come into close contact with the index hole so that the lock pin cannot be removed.

If the operation lever is attached to the lock pin, the lock pin can be easily inserted into and removed from the guide hole and the index hole through the operation lever, and the eccentric head can be turned forward and backward. There is no need to use tools.

If the operation lever can be set at an arbitrary rotation angle with respect to the lock pin, the operation lever can be set by selecting a rotation angle at which the operation is most easily performed, and the usability can be further improved. .

If the restricting member is attached to the base, the restricting member can restrict the rotary table at an arbitrary indexing position. Therefore, the restricting member has no indexing hole and can be locked even at the indexing position where locking by the lock pin is impossible. Thus, the rotary table can be securely locked, and the work can be positioned and indexed at an arbitrary rotational position.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

The indexing lock mechanism in the indexing device includes:
The lock table 31 is combined with the turntable 20 mounted on the base 10 (FIGS. 1 and 2).

The base 10 is a prismatic block having a chamfered corner, and a short pillar 12 and long pillars 13, 13... Further, a through hole 11a is formed inside the base 10 via a ring-shaped partition wall 11 at the center. Base 1
A reference scale 15 for indicating the indexing position of the turntable 20 is provided on one side surface of the rotary table 20, and a stepped recess 16 is formed on the lower surface, and set screws 17a, 17a.
A ring-shaped cover 17 is attached via the. The column 12 has a guide hole 12 a facing the center of the base 10.
A bush 12b is press-fitted into the guide hole 12a toward the center of the base 10.

Each of the pillars 13 has an accommodating portion 13a which is cut out in an arc shape toward the center of the base 10 (FIGS. 2 and 3). The accommodating portion 13a is provided with a bolt 14a. Thus, the restraining member 14 is detachably housed. In addition,
Each restraining member 14 is formed with a mounting hole 14b through which a bolt 14a penetrates up and down, and an engaging recess 14c whose bottom surface is open. A threaded hole 13b that fits the bolt 14a is formed at the bottom of the storage portion 13a located in the middle of the column portion 13, and a stud bolt 13c that protrudes into the engagement recess 14c and stops the restraining member 14 from projecting is provided. ing. Each restraining member 14 can lock the rotary table 20 so that it cannot rotate by pressing the peripheral edge of the rotary table 20 by tightening the bolt 14a (two-dot chain line in FIG. 2).

The rotary table 20 has a main body 21 and a boss 22 protruding from the rear surface of the main body 21 integrally formed, and a chuck 26 is mounted on the upper surface of the main body 21 (FIG. 2). , FIG. 3).

An index hole 21 is provided on the outer peripheral surface of the main body 21.
are formed in the radial direction of the main body 21 at predetermined angles, and each index hole 21a has a guide hole 12a.
A bush 21b smaller in diameter than the bush 12b on the a side is press-fitted. A through hole 21c is commonly formed in the center of the main body 21 and the boss 22. On the upper surface of the main body 21, a large-diameter concave portion 21f is formed.
An annular rib 21d is formed on the outer periphery of the. An annular oil groove 21 e is formed on the lower surface of the main body 21. Each indexing hole 21a partially opens at the periphery of the concave portion 21f on the upper surface. Also, the main body 2
Scales 21g facing the reference scale 15 on the base 10 side are formed at predetermined angles on the outer periphery of the base 1 (FIG. 1).
However, it is assumed that a vernier (not shown) facing the scale 21g is displayed in parallel with the reference scale 15 on the base 10 side.

The turntable 20 is rotatably held on the base 10 via a boss 22 and a bearing 23 (FIG. 2). However, the boss portion 22 penetrates the bearing 23 so as to be movable in the axial direction, and the leading end protruding below the partition wall 11 through the through-hole 11 a has a partition wall 11.
The screw member 24 which is in contact with. The screw member 24 is housed in the recess 16 of the base 10. A stopper bolt 25 is set up inside the boss portion 22 so as to be exchangeable via a mounting base 25a and a lock nut 25c. The mounting base 25a is provided with set screws 25b, 25
It is screwed to the tip of the boss part 22 via b. The stopper bolt 25 is connected to the chuck 2 through the through hole 21c.
6, the work can be positioned by defining the depth at which the work (not shown) mounted on the chuck 26 enters the chuck 26.

The chuck 26 has a cylindrical block 26a.
A plurality of chuck claws 26b, 26b,... Are assembled on the upper side in the radial direction (FIGS. 1 and 2). The block 26a
Drive members 26c, 26c... For driving the chuck claws 26b, 26b. Therefore,
The chuck 26 is connected to the driving member 26 via a tool (not shown).
By rotating c, 26c in the forward and reverse directions, the chuck claws 26b, 26b... can be opened and closed in the radial direction of the block 26a.

The lock pin 31 has an eccentric head 31a, a guide portion 31b, and a rod body portion 31c formed in this order from the tip, and an operation lever 32 is provided on the opposite side of the eccentric head 31a.
Is attached.

The operation lever 32 has a lever portion 32a and a mounting portion 32b integrally formed (FIGS. 1 and 4). The mounting portion 32b has recesses 32d and 32f formed on both sides of an intermediate ring-shaped partition portion 32c. The rod body 31c at the rear of the lock pin 31 is inserted into the recess 32d, and is inserted into the recess 32f. A set screw 31f that stands upright at the rear end of the lock pin 31 is accommodated through the partition 32c. The recess 32d has an internal tooth 32e meshed with an external tooth 31e formed at the rearmost portion of the lock pin 31, and the recess 32f has a space between the head of the set screw 31f and the partition 32c. A compression spring 32g is interposed.

Then, the operating lever 32 releases the engagement of the internal teeth 32e and the external teeth 31e by pushing the set screw 31f into the recess 32f against the spring 32g (two-dot chain line in FIG. 4). The lever 32a can be arbitrarily rotated relative to the lever 31. The operation lever 3
2 can be set to an arbitrary rotation angle with respect to the lock pin 31 by meshing the external teeth 31e with the internal teeth 32e via the spring 32g (solid line in the figure).

The guide portion 31b of the lock pin 31 is formed to have a diameter suitable for the inner diameter of the bush 12b of the guide hole 12a (FIG. 5). The lock pin 31 is
The stopper portion 31d that contacts the end of the rod body 3
1c, formed between the guide portion 31b. The eccentric head 31a protrudes from the tip of the guide portion 31b by eccentrically moving the axis C1a by an eccentric amount δ with respect to the axis C1 of the guide portion 31b. The eccentric head 31a has a smaller diameter than the guide portion 31b, and furthermore, the bush 21 of each indexing hole 21a.
The diameter of the eccentric head 31a is slightly smaller than the inner diameter of the eccentric head 31a. A mark 31 g indicating the eccentric direction of the eccentric head 31 a is displayed on the rod body 31 c of the lock pin 31 (FIG. 1), and the guide hole 1 is provided on the column 12 of the base 10.
In the vicinity of 2a, a mark 12d corresponding to the mark 31g is displayed according to the rotation direction of the turntable 20.

The lock pin 31 is arranged such that the mark 31g is aligned with the mark 12d, and the guide portion 31b is inserted into the bush 12b of the guide hole 12a (FIG. 5). Can be entered. At this time, the stopper 31d
Defines the maximum depth D at which the eccentric head 31a enters the index hole 21a by contacting the end of the bush 12b.

In this case, since the axis C2a of the indexing hole 21a passes through the center of rotation C2 of the rotary table 20 and the eccentric head 31a is eccentric by the amount of eccentricity δ, The axis C2a of the hole 21a is tilted by a small angle θ with respect to the axis C1 of the lock pin 31, and the eccentric head 31a contacts the inner surface of the bush 21b at the contact P1 on the eccentric direction. However, at this time, the rotary table 20 has the respective axes C of the index holes 21a, 21a,.
The height of 2a coincides with the axis C1 of the lock pin 31, that is, the height of the axis of the guide hole 12a, and the lower surface of the main body 21 has a small gap d≪δ with respect to the upper surface of the base 10. (FIG. 2).

When the lock pin 31 is rotated clockwise through the operation lever 32 by the rotation angle α (FIG. 5).
Arrow K1 direction), the eccentric head 31a is
a in the bush 21b, the axis C1a turns around the axis C1 of the lock pin 31 in the same direction by the rotation angle α (FIG. 6), and the contact point P1 between the eccentric head 31a and the bush 21b moves to the contact point P1a. I do. The contacts P1 and P at this time
The distance of 1a is a = rsin α in the axial direction of the turntable 20.
And b = r (1-co in the rotation direction of the turntable 20.
s α). Here, r is the axis C of the lock pin 31.
It represents the distance from 1 to the contacts P1, P1a.

Therefore, assuming that r≫δ 、 d,
The lock pin 31 realizes a = rsin α = d by rotating by an extremely small rotation angle α.
The rotary table 20 is driven so as to be pressed against the base 10 via the base 1a, and the rotary table 20 can be locked by bringing the lower surface of the main body 21 into close contact with the base 10. At this time, the rotation amount of the turntable 20 is b = r (1-cos) at the positions of the contacts P1 and P1a.
α) ≒ 0, which can be substantially ignored.

When releasing the lock of the rotary table 20, the lock pin 31 is rotated backward to the original position so that the mark 31g coincides with the mark 12d, and the index hole 21 is released.
a, The lock pin 31 may be extracted from the guide hole 12a.

When the eccentric head 31a of the lock pin 31 is inserted into the indexing hole 21a to lock the rotary table 20, if the diameter of the eccentric head 31a is sufficiently smaller than the inner diameter of the bush 21b, the eccentric head 31a will not move. May not come into contact with the inner surface of the contact and the contact P1 may not be formed. However, even in that case, the contact pin P1 is formed when the eccentric head 31a comes into contact with the inner surface of the bush 21b within the range of the rotation angle α <90 °, and the lock pin 31 is connected via the eccentric head 31a. It is sufficient if the rotary table 20 can be driven toward the base 10 by a distance corresponding to the gap d (FIG. 7). In the figure, the contact point P1 is formed at the rotation angle α1 of the lock pin 31,
The contact point P1 is moved to the contact point P1a by the subsequent rotation angle α2, and the turntable 20 is set to a1 = r (sin α−sin α1
) = D in the axial direction toward the base 10 side. However, α = α1 + α2 <90 °.

The diameter of the eccentric head 31a is such that when the eccentric head 31a is inserted into the indexing hole 21a, the contact P1 is formed in the eccentric direction and the contact P2 is also formed in the opposite direction.
May be determined so as to form a relative relationship with the inner diameter of the bush 21b (FIG. 5). Eccentric head 31a at this time
When the lock pin 31 is rotated to turn inside the bush 21b, the rotary table 20 can be driven in the axial direction while moving the contact P1 in the same direction and moving the contact P2 in the opposite direction.

The rotary table 20 can be locked at an arbitrary indexing position via the restraining members 14, 14 without using the lock pins 31 and the indexing holes 21a, 21a. 3). That is, the restraint member 14,
14 can press the peripheral portion of the turntable 20 toward the base 10 by screwing the bolt 14a deeply into the screw hole 13b, thereby locking the turntable 20 so that it cannot rotate. When the rotary table 20 is released, the bolts 14a may be loosened.

Such an indexing device is used by being attached to the entire machine vise MS via the base 10 (FIG. 8). That is, the indexing device sets the base 10 on the base frame MS1 of the machine vise MS, and sends the machine vise MS via the fixed jaw MS2 and the movable jaw MS3.
Set to. In addition, the chuck 26 is
.. can be gripped and any workpiece W can be gripped, and the workpiece W can be positioned at an arbitrary indexing position via the rotary table 20 and indexed. In addition, the indexing device is mounted on the machine vise MS such that the chuck 26 is mounted sideways in one of left and right directions.
May be mounted upward, and in any case, the base 10 can be appropriately rotated so that the pillar portion 12 into which the lock pin 31 is inserted is at an appropriate position. Further, the rotation angle of the operation lever 32 of the lock pin 31 with respect to the lock pin 31 may be arbitrarily set so that the rotation operation of the lock pin 31 is easy.

[0039]

As described above, according to the present invention, by adopting the lock pin having the eccentric head at the tip, the lock pin can index the eccentric head to the rotary table through the guide hole of the base. Since the rotary table can be inserted into the hole and rotated to lock the rotary table at the indexing position, there is no need to incorporate complicated mechanical components such as a worm gear mechanism into the base, and the overall structure can be simplified and the weight can be reduced. There is an excellent effect that the cost of goods can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view of the overall configuration.

FIG. 2 is an enlarged cross-sectional view taken along line X1-X1 of FIG.

FIG. 3 is an enlarged plan view of an enlarged view corresponding to an arrow X2 in FIG.

FIG. 4 is an enlarged sectional explanatory view of a main part of FIG. 1;

FIG. 5 is an enlarged sectional explanatory view of a main part of FIG. 3;

FIG. 6 is an operation explanatory view (1).

FIG. 7 is an operation explanatory view (2).

FIG. 8 is an explanatory view of a use state.

[Explanation of symbols]

 D ... Maximum depth 10 ... Base 12a ... Guide hole 14 ... Restriction member 20 ... Rotating table 21a ... Indexing hole 31 ... Lock pin 31a ... Eccentric head 31d ... Stopper part 32 ... Operation lever

Claims (6)

[Claims] A lock pin having an eccentric head at an end thereof, wherein the lock pin rotates the eccentric head by entering the index hole of the rotary table through a guide hole of a base and rotating the rotary table. An indexing lock mechanism in an indexing device, which locks at an indexing position. 2. The indexing lock mechanism according to claim 1, wherein the lock pin drives and locks the rotary table to the base via the eccentric head. 3. The lock pin according to claim 1, wherein a stopper is formed on the lock pin, and the stopper defines a maximum depth at which the eccentric head enters the index hole.
Or an indexing lock mechanism in the indexing device according to claim 2. 4. An indexing lock mechanism in an indexing device according to claim 1, wherein an operation lever is attached to said lock pin. 5. The indexing lock mechanism according to claim 4, wherein the operation lever can be set at an arbitrary rotation angle with respect to the lock pin. 6. An indexing lock mechanism in an indexing device according to claim 1, wherein a restricting member for restricting the rotary table to an arbitrary indexing position is attached to the base.