JPH09267206A - Floating chuck having centripetal characteristic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably and easily perform inside diameter finishing work or the like of a work by arranging a piston chamber and a crank chamber in a chuck main body, and constituting so as to longitudinally move a jaw and a claw by swinging cranks in the crank chamber through pairs of pistons and piston sliders in the piston chamber. SOLUTION: A pair of piston sliders 7 are advanced and retreated by an advance-retreat of a pair of pistons 6 arranged in a piston chamber 3. These piston sliders 7 are formed by fitting a slider constituting projecting member 07 and a slider constituting recessed member 007, and the projecting member 07 is composed of three collar pieces 71, fitting clearances 72 of three places and a cylindrical main body 73, and the recessed member 007 is composed of three collar pieces 71', fitting clearances 72' of three places and a cylindrical main body 73'. Respective horizontal arms 82 of respective cranks 8 are respectively arranged between the collar pieces 71 and 71 and between the collar pieces 71' and 71', and the cranks 8 are swung by the collar pieces 71 and 71', and advance and retreat a jaw 10 through a vertical arm 81, and chuck a work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating chuck capable of finishing inner diameter and having centripetal properties.

[0002]

As is well known, a floating chuck,
In a chuck such as a spawn chuck, a piston that moves back and forth is inserted in a cylinder chamber provided in the body of the chuck, and a swinging crank is pivotally supported by a crank chamber provided in the body, and The crank is oscillated through the motion, and several oscillating jaws provided on the chuck body are moved back and forth by utilizing this oscillating movement, and the workpieces are held or held open by the several claws synchronized with the jaws. It is configured to do. At this time, the work is fixed to the center pin of the chuck body, and is clamped by several claws that follow the outer peripheral surface of the work as described above.
It is held by using the action of doing. That is, the work fixed to the center of the chuck body is held by a few claws. It should be noted that the prior art relating to the above configuration is actually fair.
There is a work tightening mechanism in the 8005 spawn chuck.

[0003]

As described above, the work is fixed to the center of the chuck body, and the claw follows the outer peripheral surface of the fixed work. Therefore, when staying in a chucking operation using an inclusion (for example, a center pin) or when performing various processing such as inner diameter finishing processing on a workpiece, the inclusion interferes and the inner diameter finishing processing can be performed. There are no drawbacks, eg gears,
There is a problem such that the perforation of the collar or the like or the above-mentioned processing cannot be performed.

Further, the moving claws (moving claws) have a structure in which they move substantially simultaneously toward the center of the chuck body by the jaws. Therefore, a plurality of works cannot be chucked at the same time by the moving claw, so that there are problems such as inability to process a plurality of works at the same time and inefficiency.

[0005]

SUMMARY OF THE INVENTION In view of the above, the present invention provides
To provide a floating chuck that can reliably and easily perform work such as inner diameter finishing and inner diameter processing of workpieces.
Alternatively, the following configuration is adopted for the purpose of being able to chuck a plurality of works at the same time.

That is, the floating chuck having the centripetal characteristic of the present invention includes a chuck body having a piston chamber and a crank chamber, a pair of pistons provided in the piston chamber so as to be movable back and forth, and the pair of pistons and the piston. Centripetal characteristics including a plurality of cranks swingably provided in the crank chamber that swings with a slider, a drive source that operates the pistons, and a plurality of jaws having claws that move back and forth by the cranks. In the floating chuck, the piston slider is composed of a pair of slider-constituting concave-convex members that are provided so as to be fitted between the pair of pistons.

[0007]

Embodiments of the present invention will be described below.

To tighten the work provided on the chuck body, the pistons are retracted, and the piston sliders are individually retracted. That is, the flange piece of the slider-constituting convex member and the flange piece of the slider-constituting concave member are individually retracted. As a result, the cranks that are respectively locked to the flange piece of the slider-constituting convex member and the flange piece of the slider-constituting recess member are respectively swung in the clockwise direction (this is an example of the drawing, and is not limited; the same applies hereinafter), Due to this swinging, the jaw is moved in the centripetal direction (the X arrow direction, but it is not limited to this in the example. The same applies hereinafter), and is provided on the chuck main body by each claw that synchronizes with the movement of the jaw. The work is chucked. That is, in this example, the three claws simultaneously move as a unit, and the two workpieces can be chucked almost simultaneously in one step (one operation). In addition, there are no obstacles such as center pins in the center of the work, and inner diameter processing (center processing)
Etc. can be processed. That is, it is possible to machine the inner diameter of parts such as gears, collars, washers, and equipment.

[0009]

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

Reference numeral 1 denotes a mounting base which also serves as a lid mounted on a face plate of a processing machine (not shown) such as a grinding machine.
A case main body 2 is provided in the housing 1. The mounting base 1 and the case main body 2 form a chuck main body A, and a piston chamber 3 and a crank chamber 4.

Next, in the embodiment of the invention shown in FIG. 1, the piston chamber 3 has a pair of pistons 6 and 6 which are moved forward and backward by a drawbar connector 5 provided in a processing machine, and between the pair of pintons 6 and 6. Is equipped with a piston slider 7,
By the forward and backward movement of the pair of pintons 6, 6, the piston slider 7 is individually forward and backward moved. In this example, the piston slider 7 includes a slider-constituting convex member 07 and a slider-constituting concave member 00.
7 and 7 are configured to be fitted to each other (an example).
The slider-constituting convex member 07 is composed of three flange pieces 71, three fitting gaps 72, and a tubular body 73, and the slider-constituting recess member 007 includes three flange pieces 71 ′. And a fitting gap 72 'at three locations and a tubular body 73'. Then, the three flange pieces 71 ′ of the slider component concave member 007 are fitted into the three fitting gaps 72 of the slider component convex member 07, and the three fitting gaps of the slider component concave member 007. The three brim pieces 71 of the slider-constituting convex member 07 are fitted to 72 '. That is, three flange pieces 71 'are fitted between the three flange pieces 71, and the three flange pieces 71,
The three flange pieces 71 ′ have pins 6 individually provided on the piston 6.
1 is a stop. Therefore, the slider-constituting convex member 07 and the slider-constituting concave member 007 move forward and backward individually. Reference numeral 8 denotes a large number of cranks (six cranks 8 in this example) provided in the crank chamber 4 so as to be swingable by a shaft 9, and each of the cranks 8 (hereinafter, one crank 8 will be described. Each horizontal arm 82 (hereinafter, referred to as one horizontal arm 82) is between the collar pieces 71, 71 of the slider constituting convex member 07, and the collar pieces 71 ′, 71 of the slider constituting concave member 007. And the horizontal arm 82 and the crank 8 are similarly configured to move forward and backward (swing) when the collar pieces 71 and 71 'move forward and backward. Also this crank 8
Each vertical arm 81 (hereinafter, described as one vertical arm 81) of each jaw 1 that moves forward and backward on the surface of the case body 2
0 (hereinafter, described with one jaw). Therefore, as described above, the swing of the crank 8 swings the vertical arm 81, and the swing of the vertical arm 81 causes the jaw 10 to move forward and backward.
In other words, it is a structure that approaches or separates from the center of the case body 2. The jaw 10 is provided with a pawl 11, and the pawl 11 approaches or separates from the center of the case body 2 similarly to the jaw 10, and chucks the works W and W ′ provided on the case body 2. It is a king configuration. As shown in FIGS. 4 and 5, the claw 11 is ideally structured such that two workpieces W and W ′ are chucked at the same time as a structure having a lower cutout 11a and an upper cutout 11b. is there.

In the embodiment of FIG. 2, a supply hole 21 for fluid such as air and hydraulic pressure is formed in the side wall of the mounting base 1, and an annular groove is formed on the outer peripheral wall surface of the case body 2 in correspondence with the supply hole 21. 22 is engraved, and the annular groove 22 is provided so as to communicate with the piston chamber 3 through the passage 23 and supply air to the rear surface of the piston 6. This piston chamber 6
Is provided with a pair of pistons 6, 6, and a piston slider 7 is provided between the pistons 6, 6. In this example, each pin 24 provided on the piston 6 is inserted between the top walls of the piston chambers 3, and a spring 25 is wound around each pin 24 and the spring 25 The piston 6 is always biased in the backward direction by the elastic force. Therefore, in this example, the piston 6 is moved forward by the supply of the fluid, and is retracted by the stop of the fluid and the elastic force of the spring 25. The other configuration is almost the same as the above-described example.

[0013]

According to the present invention, the chuck body has a piston chamber,
A crank chamber is provided, and a plurality of cranks provided in the crank chamber are oscillated through a pair of pistons and piston sliders that can be moved back and forth in the piston chamber, so that the jaw and the claw are brought to the center of the chuck body. Since it is configured to move forward and backward, it is possible to provide a floating chuck that can surely and easily perform work such as inner diameter finishing processing and inner diameter processing of a workpiece. Further, it is possible to provide a floating chuck having centripetal properties without requiring inclusions. Further, according to the present invention, a plurality of works can be chucked at the same time by providing the claw with the upper and lower cutouts.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a second embodiment of the present invention.

FIG. 3 is an enlarged perspective view of a piston slider.

FIG. 4 is an enlarged perspective view of a claw.

FIG. 5 is an enlarged perspective view of a claw.

[Explanation of symbols]

 1 Mounting Base 2 Case Main Body 3 Piston Chamber 4 Crank Chamber 5 Drawbar Connecting Tool 6 Piston 61 Piston Pin 7 Piston Slider 07 Slider Constituent Projection Member 71 Collar Piece 72 Fitting Gap 73 Main Body 007 Slider Configuration Recessed Material 71 'Collar Piece 72' Gap 73 'Main body 8 Crank 81 Vertical arm 82 Horizontal arm 9 Axis 10 Jaw 11 Claw 11a Lower notch 11b Upper notch 21 Supply hole 22 Annular groove 23 Passage 24 pin 25 Spring A Chuck body W work W'work

Claims (3)

[Claims] 1. A chuck body having a piston chamber and a crank chamber, a pair of pistons provided in the piston chamber so as to be movable back and forth, and a swing in the crank chamber which is swung by the pair of pistons and a piston slider. A floating chuck having a centripetal characteristic, comprising: a plurality of cranks that are provided so as to move, a drive source that operates the piston, and a plurality of jaws that have a claw that moves back and forth with the crank; A floating chuck having a centripetal characteristic, characterized in that the floating chuck is composed of a pair of slider-constituting concave and convex members provided in a fitting manner between the pair of pistons. 2. The centripetal characteristic according to claim 1, wherein the pair of pistons provided in the piston chamber so as to be movable back and forth are configured to move back and forth by the hydraulic pressure that is press-fitted or pushed into the piston chamber. Floating chuck having. 3. A floating body having a centripetal characteristic according to claim 1, wherein the pair of pistons provided in the piston chamber so as to be movable back and forth are configured to be moved back and forth by a draw bar provided in a processing mechanism. Chuck.