JP2001225214A - Holding mechanism for pillar material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holding mechanism for a pillar material that can advantageously accommodate a wide range of diametral dimensions of pillar materials, and further facilitate holding and centering operations and improve the holding effect. SOLUTION: A rotary baseboard is installed in a case body, and pivot pins are arranged in circumferentially trisecting places on the rotary baseboard to support subsidiary lever rods. Anchor pins are secured in circumferentially trisecting places on each of a pair of frame boards to support main lever rods. The tip of each main lever rod supports a tip holding member rotatably, and the tip of each subsidiary lever rod is journalled to the substantial middle place on the related main lever rod.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for gripping a columnar object, and more particularly, to a wide range from a large-diameter columnar object to a small-diameter columnar object. The present invention relates to a gripping mechanism for a columnar object that is simple and reliable, can also perform centering reliably, and has a perfect gripping effect. In addition, the columnar object in this specification includes both a cylindrical body such as a circular pipe and a solid rod having a circular cross section.

[0002]

2. Description of the Related Art Conventionally, in the fields of chucks for lathes and column holders in pipe cutting machines, in order to stably hold a columnar object to be processed, various mechanisms for holding columnar objects are used. Have been.

[0003]

By the way, in the gripping mechanism, there is provided a tip gripping member which is pressed against the columnar object to directly pinch and grip the columnar object. Because a large stroke width could not be secured when the member appeared, the applicable range of the diameter of the columnar object that could be accommodated was narrowed, and the gripping operation was complicated and the gripping effect was not strong. There was a problem.

Further, conventionally, in order to cope with a columnar object having a large diameter, a plurality of individually attachable attachments are prepared, and the most suitable attachment is selected and attached. It took effort.

Accordingly, a first object of the present invention is to make it possible to widely correspond to the size of the diameter of a columnar object.
The object of the present invention is to make it possible to easily perform a gripping operation and a centering operation and to enhance the gripping effect. By providing a column-shaped gripping mechanism having such advantages, all the above problems can be solved. It is to try to make it.

[0006]

Means for Solving the Problems As means for solving the problems of the present invention, first, a case body is constituted by a pair of frame plates having through holes through which a columnar object can be inserted. Inside the case body, there is provided a through hole through which a columnar object can be inserted, and a rotating board that is rotatable in the circumferential direction is provided, and the circumferential direction of the rotating board is divided into three equal parts. Three pivot pins are provided, and the rear ends of the sub-lever rods are pivotally supported by the pivot pins. Each of the pair of frame plates is divided into three equal parts in the circumferential direction. Attach three anchor pins, and at each anchor pin, support the rear end of each of the three main lever rods in a pivotal manner. A tip holding member capable of pinching and holding a columnar object is pivotably supported pivotably, The distal end of serial sub-lever rod, a gripping mechanism of pillars, characterized in that the pivotally mounted connected to a substantially middle position of the main lever rod.

According to a second aspect of the present invention, there is provided a column-like object gripping mechanism according to the first aspect, wherein the distal end gripping member is supported in a pivotally supported manner in a double-supported state.

According to the first aspect of the present invention, an organic link mechanism is used to secure a large stroke width when the tip gripping member protrudes and retracts. There is a feature that the operation and the centering operation are simplified, and the gripping effect is also enhanced.

Further, in the columnar object gripping mechanism according to the second aspect, the distal end gripping member is supported in an axially mounted state in a stable double-supported support state, so that it can be compared with a conventional cantilevered support state distal end gripping member. And the contact state with the columnar object becomes stable,
There is a feature that the contact pressure is increased, and as a result, the gripping effect is also perfect.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, one embodiment of a column-shaped object gripping mechanism of the present invention will be described in detail, but the present invention is not limited to these.

First, the present invention will be described with reference to FIGS. 1 to 6. FIG. 1 is an explanatory view of the operation principle of the gripping mechanism, FIGS. 2 and 3 are central longitudinal sectional views of the gripping mechanism, and FIG. 3 shows a state in which the gripping of the columnar object is released, and FIG. 4 shows a cross-sectional view taken along line XX in FIG. FIG. 5 is a perspective view of a case body, and FIG. 6 is a perspective view of a rotating board.

In the present invention, a pair of frame plates 1a and 1b are arranged in parallel, and an outer peripheral frame 2 is stretched between the frame plates 1a and 1b so as to be integrated as a whole. Through holes 5a and 5b for penetrating the columnar object 4 are formed substantially near the center of the plates 1a and 1b.

The shapes of the frame plates 1a and 1b and the through holes 5
Generally, the shapes of a and 5b are preferably disk-shaped as shown in the figure, but other shapes may of course be used. In addition, although the columnar member 4 is generally long in the shape of a cylinder or a solid rod and having a circular cross section, it is needless to say that a long shape such as a polygonal cross section other than a circle can be used.

Next, a rotating board 6 is provided in the case body 3.
Are arranged so as to be rotatable within the case body 3. A through hole 6a through which the columnar object 4 can be inserted also into the rotating substrate 6.
Are formed. The turning operation of the turning board 6 is performed by appropriate means.
The operating rod 7 is set so as to be freely movable in the direction of arrow A or the direction of arrow B in the elongated hole 8 formed in the outer peripheral frame 2. The rotation width (rotation angle) of the rotation substrate 6 is freely designed, but is restricted by the length of the long hole 8 in the illustrated embodiment.

As a method of moving the operating rod 7, in addition to directly applying power to the operating rod 7, there are a method using a rack and pinion mechanism, a method using a worm gear, and the like.
According to these methods, since the reverse rotation from the operation rod 7 does not occur, there is a characteristic that the operation rod does not return unexpectedly.

Next, the pivot substrate 6 is provided with three pivot pins 9a, 9b, 9c at positions divided into three equal parts in the circumferential direction. The sub-lever is provided by the pivot pins 9a, 9b, 9c. The rear ends of the rods 10a, 10b, 10c are pivotally supported.

In the embodiment shown in FIG. 6, the pivot pins 9a, 9b, 9c are formed at an inward position as far as possible on the pivot board 6. In the embodiment of FIG. Protruding bulges 15a, 15b, 15c were formed in one side. As a result, a large space can be secured inside the rotating board 6 other than the protruding bulging portions 15a, 15b, 15c, and due to the large space, other link mechanisms do not collide with the rotating board 6. This makes it possible to move smoothly, and as a result, a feature is obtained in which a large stroke width can be secured when the tip gripping member described later appears and disappears.

At positions where the circumferential direction of the pair of frame plates 1a and 1b is divided into three equal parts, the respective frame plates 1a and 1b are positioned.
b, three anchor pins 11a, 11b, and 11c are attached.
b, 11c, three main lever rods 12a, 12
The rear ends of b and 12c are pivotally supported by the frame plates 1a and 1b.

On the other hand, the main lever rods 12a, 12b,
12c, the tip gripping members 13a, 13b, 1
3c is pivotally supported in a rotatable manner. The distal end gripping members 13a, 13b, 13c are configured so as to cooperate with each other to pinch and hold the columnar object 4.

Further, the sub-lever rods 10a, 10b,
The distal end of 10c is pivotally connected at a substantially intermediate position between the main lever rods 12a, 12b, 12c via shafts 14a, 14b, 14c.

According to the mechanism having the above structure, first, the frame plates 1a and 1b and the through holes 5a of
The columnar object 4 is inserted through 5b and 6a. Next, when the driving rod 7 is moved in the direction of arrow A by an appropriate driving source, the rotating substrate 6 is moved by a predetermined amount in the case body 3 (in the embodiment of FIGS. To rotate. When the rotating board 6 rotates, the pivot pins 9a, 9b, 9c provided on the rotating board 6 also move in the direction of arrow a, so that the sub-lever rods 10a, 10b, 10c are pulled in the same direction. Become.

After the sub-lever rods 10a, 10b, 10c are pulled in the above-mentioned directions, the shafts 14a, 14b, 1
The main lever rods 12a, 12b and 12c are pulled by the sub lever levers via 4c. At this time, the rear ends of the main lever rods 12a, 12b, 12c are
Since it is pivotally supported on the frame plates 1a, 1b by the anchor pins 11a, 11b, 11c, it remains immobile at that position.

As described above, the main lever rods 12a, 12
Since the rear ends of b and 12c are in an immovable state integrally with the case body 3 (however, since they are only supported pivotally, the shaft can freely rotate), each main lever rod is With the anchor pins 11a, 11b and 11c as fulcrums, FIG.
From the state shown by the solid line in FIG.

When the main lever rods 12a, 12b and 12c move to the state shown by the dashed lines, the three tip gripping members 13a, 13b and 13c pivotally supported at the respective ends of the main lever rods, The state of moving in the direction of arrow D in FIG.

The pivot pins 9a, 9b, 9c of the present invention are formed at positions that divide the circumferential direction of the rotary board into three equal parts.
12b and 12c are attached, and the sub-lever rod 1
0a, 10b, and 10c are also formed in the same size, so that the three tip gripping members 13a, 13b, and 13c abut against the outer peripheral surface of the column 4 with uniform pressure. Will be automatically and accurately performed.

The tip gripping members 13a, 13b, 13c
Is excellent in gripping effect, and a strong gripping effect can be obtained.
In addition, it is possible to achieve a more reliable gripping effect by improving the anti-slip effect by a method such as knurling the surface of the tip gripping member.

Subsequently, as shown in FIG. 2, when the operating rod 7 is moved in the direction of arrow B, the sub-lever rod and the main lever rod are moved in the reverse order to the above description, and the distal end gripping member is formed into a columnar shape. The object 4 can be released from the gripping state.

Further, as shown in FIG.
3a, 13b, and 13c are constituted by rotating rollers and the like, and the left and right ends of the rotating rollers and the like are pivotally supported in a double-supported state.
The stability of the gripping surface is particularly excellent.

[0029]

As described above, according to the columnar object gripping mechanism of the present invention, since the link mechanism that allows the distal end gripping member to largely protrude and retract in the through-hole is employed, the columnar object can be widely applied to the diameter of the columnar object. In addition to this, there is no need for an attachment or the like corresponding to each individual, and there are excellent effects such that the gripping operation and centering operation of the columnar object are simplified and the gripping effect is improved.

Further, the invention according to claim 2 is characterized in that since the distal end gripping member is supported in an axially mounted state with both ends held, the state of contact with the columnar object is stable and the gripping effect is enhanced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of the operation principle of a gripping mechanism according to the present invention.

FIG. 2 is a central longitudinal sectional view of the gripping mechanism according to the present invention in a state where a columnar object is gripped.

FIG. 3 is a central longitudinal sectional view of the gripping mechanism according to the present invention in a state where the gripping of the columnar object is released.

FIG. 4 is a sectional view taken along line XX in FIG.

FIG. 5 is a perspective view of a case body of the gripping mechanism according to the present invention.

FIG. 6 is a perspective view of a rotating substrate of the gripping mechanism according to the present invention.

[Explanation of symbols]

 1a, 1b ... frame plate 2 ... outer peripheral frame 3 ... case body 4 ... columnar object 5a, 5b ... through hole in frame plate 6 ... rotating substrate 6a ... through hole in rotating substrate 6b ... peripheral wall of rotating substrate 7 ... operation Rod 8 ... Long hole 9a, 9b, 9c ... Pivot pin 10a, 10b, 10c ... Sub-lever rod 11a, 11b, 11c ... Anchor pin 12a, 12b, 12c ... Main lever rod 13a, 13b, 13c ... Members 14a, 14b, 14c: shafts 15a, 15b, 15c: projecting bulges

Claims (2)

[Claims] 1. A case body is constituted by a pair of frame plates having a through hole through which a columnar object can be inserted. The case body has a through hole through which a columnar object can be inserted, and is rotatable in a circumferential direction. Is provided, and three pivot pins are provided at positions obtained by dividing the circumferential direction of the rotating substrate into three equal parts,
The rear end of the sub lever lever is pivotally supported by this pivot pin, and three anchor pins are attached to each frame plate at positions where the circumferential direction of the pair of frame plates is divided into three equal parts. At each anchor pin, the rear end of each of the three main lever rods is pivotally supported, and each of the distal ends of the main lever rods has a front end grip that can cooperate and pinch a columnar object. A gripping mechanism for a columnar object, wherein a member is rotatably supported pivotally, and a tip of the sub-lever rod is pivotally connected to a substantially middle position of the main lever rod. 2. The column-shaped gripping mechanism according to claim 1, wherein the distal end gripping member is supported pivotally in a double-supported state.