JPH0623402Y2 - Work holding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a work gripping device for gripping or separating a work in a device for automatically supplying a work to a machine tool such as a pressing device.

[Conventional technology]

A conventional device of this type requires one to hold one work piece.
When a table is required and a plurality of works need to be gripped at the same time, a plurality of apparatuses are installed in parallel and used.

[Problems to be solved by the device]

According to the conventional device as described above, the same number of devices must be used for simultaneously gripping a plurality of workpieces, which increases the equipment cost and increases the installation space, resulting in an extra space such as a press device. It becomes difficult to incorporate into.

Moreover, a plurality of drive devices are required, and it is troublesome to synchronize the drive devices with each other.

The present invention has been made in view of the above problems of the conventional technique, and a single drive device can efficiently and simultaneously grip or separate a plurality of works in a narrow range. Moreover, it is an object of the present invention to provide a work holding device having a simple structure.

[Means for Solving the Problems]

In order to achieve the above object, the work gripping device of the present invention is
A pair of fixed fingers projecting forward are fixed to both side parts of a movable head that can be moved in an appropriate direction by a moving device, and a front end part faces the front end part of the fixed finger inside thereof. A front end portion of one opening / closing rod pivotally attached to an intermediate portion of a pair of movable fingers, and a rear end portion of each of the movable fingers can be moved in the front-rear direction with respect to the movable head by an appropriate driving device. In addition, both of the movable fingers are opened and closed with respect to the fixed fingers facing each other by retreating and advancing the opening and closing rod, and are linked with each other.

[Action]

When the opening / closing rod is located at the appropriate retracted position, the pair of movable fingers are open with respect to the fixed fingers.

From this state, when the open / close rod moves forward, both movable fingers simultaneously rotate in the closing direction with respect to the fixed finger,
Two workpieces can be simultaneously gripped by the tips of the fixed finger and the movable finger that face each other.

In this state, when the movable head is moved to a desired position by the moving device and then the opening / closing rod is retracted, both movable fingers open with respect to the fixed fingers, and the two works fall simultaneously.

Next, after returning the movable head to the original position, by repeating the same operation as described above, two works can be simultaneously conveyed from the original position to the desired position.

〔Example〕

1 to 4 show an embodiment in which the present invention is applied to an automatic feeding device for an engine valve, which is a work, and is fixed to the upper end of an appropriate moving device (1) to move up and down. In addition, a pair of push rods (3) and one opening and closing are provided at the both side ends and the center of the movable base (2) that moves in the left and right direction and that moves in the lateral direction and are parallel to each other in the front and rear direction. The rod (4) and the rod (4) are slidably provided in the front-back direction.

A flange (5) as a stopper is continuously provided at the rear end (lower end in FIG. 1) of each extruding rod (3), and a bottomed hole (6) is bored from the rear surface to form a bottomed hole (6). A sliding rod (7) is fitted to the. A compression spring (8) is contracted between the rear end in the bottomed hole (6) and the front end of the sliding rod (7).
The sliding rod (7) always slightly projects from the flange (5).

A pair of upper and lower pivotal support pieces (4a) (4a) formed at the front end of the opening and closing rod (4).
A roller (9) oriented in the up-down direction is pivotally supported on a), and a pivot shaft (10) of the roller (9) projects in the up-down direction from the pivot support pieces (4a) (4a).

The rear end of the opening / closing piece (4) and the rear ends of the both sliding rods (7) and (7) are connected by a connecting plate (11), and the connecting plate (11) is connected by the moving device (1) to the base ( 2) A drive device (not shown) that moves up and down together with sideways and is moved sideways can be moved forward and backward through the drive rod (12).

At the front ends of both extrusion rods (3) (3) protruding from the base (2),
A movable head (13), which is always in contact with the front surface of the base (2) and is made of a pair of upper and lower parallel plate members, is fixed.
At the center of the movable head (13), there are long holes (14) (1
4) is provided, and both ends of the pivot shaft (10) of the roller (9) are engaged with the elongated holes (14).

The rear part of the pair of left and right fixed fingers (15) and (15) is fixed inside the left and right ends of the movable head (13).
The work holding piece (15a) provided on the inner surface of the front part of (15) projects forward from the movable head (13).

Between the fixed fingers (15) and (15) of the movable head (13), the middle part of the pair of left and right movable fingers (16) and (16) is
It is pivoted with a pin (17).

Each movable finger (1
A V-shaped groove (18) facing the work holding piece (15a) of the fixed finger (15) is cut on the outer surface of the work holding piece (16a) provided on the front outer surface of (6).

A compression spring (19) is placed between the front parts of the two movable fingers (16) (16).
The inclining piece (16b), which is contracted and is connected to the rear part of the facing surface of the movable fingers (16) and (16) and faces inward and rearward, is in contact with the roller (9).

Reference numeral (20) is a part of the machine tool located in front of the movable head (13), and reference numeral (21) is a work which has been machined in the machine tool (20), that is, an engine valve.

FIG. 1 shows the state in which the movable head (13) is in the waiting position. Each member other than the base (2) is retracted to the rear end, and the movable head (13) moves to the base (2). Abutting on the front surface, the connecting plate (11) is spaced rearward from the flange (5) of the pushing rod (3).

The pivot (10) of the roller (9) at the front end of the opening / closing rod (4) has a long hole.
Located at the rear end of (14), the roller (9) pushes the inclined pieces (16b) (16b) of both movable fingers (16) (16) outward,
The work holding pieces (16a) of both the movable fingers (16) and (16) are rotated in a direction in which they approach each other against the compression spring (19), and the fixed finger (15) and the movable finger (16) facing each other. Both holding pieces (15a) and (16a) are separated from each other.

As shown in FIG. 3, when the connecting plate (11) is moved forward, each member other than the base (2) moves forward while maintaining the above-mentioned state, and the flange (5) of the pushing rod (3) is moved. While abutting on the rear surface of the base (2), the holding pieces (15a) of the fixed fingers (15) contact the side surface of the shaft portion of the engine valve (21).

As shown in FIG. 4, when the connecting plate (11) is further advanced against the compression spring (8) until it comes into contact with the flange (5), the roller (9) moves together with the opening / closing rod (4) to move the movable head. Advance along the long hole (14) of (13), and move both movable fingers.
(16) Separated from the inclined pieces (16b) and (16b) of (16) forward, both movable fingers (16) and (16) are rotated by the biasing force of the compression spring (19), and both holding pieces (15a) ) (16a) holds the engine valve (21).

Then, the moving device (1) raises the base (2) to pull out the engine valve (21) from the machine tool (20), and then the base (21) is moved laterally to move the connecting plate (11). When retracted, each member operates in the reverse of the above, and the engine valve (2
1) can be supplied to a machine tool (not shown) for the next process.

[Modification]

The present invention is not limited to the above embodiment,
For example, as shown in FIG. 5, a shaft (32) facing up and down in a long hole (31) formed in the front end of the opening and closing rod (4) and long in the left-right direction
The left and right pair of movable fingers (1
The movable fingers (16) and the opening / closing rod (4) may be linked to each other by connecting the other ends of the connecting links (33), one end of which is connected to 6).

The other structure is the same as that of the above embodiment.

The same members as those in the above embodiment are shown with the same reference numerals and their detailed description is omitted.

Even with such a configuration, the same operation and effect as those of the above-described embodiment can be obtained.

In addition to this, many variations and modifications are possible.

[Effect of device]

According to the present invention, a single drive device can simultaneously open and close a pair of movable fingers to simultaneously grip and separate two workpieces, which is efficient.

Further, since the pair of movable fingers are arranged inside the pair of fixed fingers, it is easy to link both the movable fingers and one opening / closing rod, the structure can be simplified, and the entire device can be made compact. Can be converted.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view of the embodiment of the present invention during a waiting period, FIG. 2 is a vertical sectional side view taken along the line AA of FIG. 1, and FIG. FIG. 4 is a partially cutaway plan view of the same when the work is gripped. Fig. 5 is a partially cutaway plan view similar to Fig. 1 showing a modified example of the present invention, (1) ... moving device, (2) ... base (3) ... extrusion rod, (4) ... … Opening and closing rod (4a) …… Pivot piece (5) …… Flange (stopper) (6) …… Bottomed hole, (7) …… Sliding rod (8) …… Compression spring, (9)… … Roller (10) …… Axis, (11) …… Coupling plate (12) …… Drive rod, (13) …… Movable head (14) …… Elongated hole, (15) …… Fixed finger (15a)… … Clamping piece, (16) …… Movable finger (16a) …… Clamping piece, (16a) …… Inclined piece (17) …… Pin, (17) …… V-shaped groove (19) …… Compression spring, ( 20) Machine tool (21) Engine valve (work) (31) Long hole, (32) Axis (33) ...... Link

Claims (1)

[Scope of utility model registration request] 1. A pair of fixed fingers projecting forward are fixed to both side portions of a movable head that can be moved in an appropriate direction by a moving device, and a front end portion has a front end portion inside the front end of the fixed finger. A pair of movable fingers facing each other, and the rear ends of the movable fingers are movable with respect to the movable head in the front-rear direction by an appropriate driving device. A work gripping device, wherein both movable fingers open and close with respect to a fixed finger facing each other at a front end portion of the open / close rod by retracting and advancing the open / close rod, respectively.