JPH0111404Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a chucking device related to chucking technology.

[Conventional technology]

In recent years, automation has been promoted in the production process of various products, and various chucking devices for holding and releasing workpieces are also being used. An example of the chucking device shown in FIG. 12 is one that clamps and releases a disc or annular workpiece, and includes a pair of chucks that open and close by reciprocating to widen and narrow the gap between them by the operation of an actuator (not shown) or the like. Three pairs of V-type Vs each having chuck plates 1 and 2 and holding one workpiece a on opposing surfaces 3 and 4 of both chuck plates 1 and 2.
Concave step portions 5a, 5b, 6a, 6b,
7a and 7b, and as shown in FIG. 13, after clamping the workpiece a, the workpiece a is transported, for example, in the direction of arrow A, and released at a predetermined position.

[Problem that the invention attempts to solve]

The chucking device having the above configuration has a problem in that when three workpieces a are conveyed at the same time, if there is a dimensional error in machining of the workpieces a, all the workpieces a cannot be reliably clamped. In other words, when transporting two workpieces a at the same time, the workpieces a
Even if there is a dimensional error in either or both of the
By swinging the chuck plates 1 and 2 so as to be inclined to each other, it is possible to hold two workpieces a at the same time, but when there are three workpieces a, the postures of the chuck plates 1 and 2 change to two. (Here, large and small do not refer to the absolute size of workpiece a, but to the relative size to the true dimensions of each workpiece a. The same applies hereinafter.) As illustrated in Fig. 13, the third and smallest workpiece a (on the right side of the figure) cannot be firmly held, and there is a risk that the workpiece a may be dropped during transportation. There is.

In addition, there is another conventional technique in which a pair of fingers are attached to a finger support member via a spring, such as the object gripping mechanism disclosed in Utility Model Application Publication No. 58-887. Since three pairs of clamping recesses are formed side by side on the opposing surfaces of the fingers, there is a problem that the three workpieces a cannot be reliably clamped, similar to the first conventional example. This problem also applies to devices that simultaneously transport four or more workpieces a.

In view of the above points, the present invention provides a chucking device that reliably clamps all the workpieces, transports them to a predetermined position, and drops them in a device of this type configured to clamp three or more workpieces at the same time. The purpose is to

[Means for solving problems]

In order to achieve the above object, the chucking device of the present invention has a pair of chuck plates that move back and forth so as to widen and narrow the distance between them, and three or more pairs of workpiece holding recesses on opposing surfaces of both chuck plates. A chucking device having a stepped portion includes a pawl plate with a stopper that slides in a moving direction of the chuck plate with respect to the chuck plate, and an elastic member that elastically biases the pawl plate in a direction to clamp a workpiece. The elastic clamping mechanism is provided separately in each of the clamping recesses.

[Effect]

The chucking device of the present invention having the above configuration reliably clamps all workpieces because the claw plate provided in each workpiece clamping concave step elastically presses against the workpiece and absorbs dimensional errors. be able to.

〔Example〕

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

As shown in FIG. 1, the chucking device is designed to clamp three workpieces as in the conventional example, and three pairs of chucks are mounted on opposing surfaces 3 and 4 of a pair of chuck plates 1 and 2. A recessed step is formed for holding the workpiece, and each of the recessed holding steps is individually provided with a pair of elastic workpiece holding mechanisms 8a and 8b having the following configuration, as shown in the figure.

2 to 4 show an enlarged view of one side 8b of this elastic workpiece holding mechanism, in which a substantially rectangular recessed portion 9 is formed on the opposing surface 4 of the chuck plate 2. A guide frame 1 having a thickness approximately half of the thickness of the chuck plate 2 is provided on both side walls and the bottom wall.
0, 10 and a stopper frame 11 are integrally provided in a protruding manner. Reference numeral 12 indicates that the concave stepped portion 9 is covered from one side of the chuck plate 2, leaving a gap 13.
It is a support plate fixed to the chuck plate 2 with screws 14, and has a V-shaped (drugged) shaped holding recessed part 15 formed on the end face of the chuck plate 2 on the opposite surface 4 side.
The support plate 12 and the guide frame 1 of the chuck plate 2
Between 0, 10 and stopper frame 11 (plate thickness direction)
A claw plate 16 is interposed between the two. In other words, this nail plate 16
The main body 17 has approximately the same thickness as the chuck plate 2.
An elastic clamping recess 18 having the same shape as the clamping recess 15 formed on the support plate 12 is formed on the upper end surface, and the support plate 12 and the chuck plate are formed on both side end surfaces of the main body 17. 2 guide frame 10, 10
Slide protrusions 20, 20 are integrally formed to slidably engage guide grooves 19, 19 sandwiched between the support plate 12 and the lower end surface of the main body 17.
and a stopper protrusion 21 that slides between the stopper frame 11 of the chuck plate 2 and that engages the lower edge of the extended protrusion 21 with the lower end surface of the support plate 12 through the gap 13 so as to be able to approach and separate. 22 is formed. The slide protrusions 2, 20 and the extension protrusion 2
1 has the same thickness and surrounds the main body 17 in a U-shape. Reference numerals 23 and 23 denote small holes 24 and 2 that open in the bottom wall of the recessed step 9 of the chuck plate 2.
This spring is inserted into the spring 4 and elastically biases the claw plate 16 in the direction of arrow B.

With the above configuration, the claw plate 16 can be attached to the stopper protrusion 22.
The lower end surface 25 of the main body 17 changes from the normal state shown in the drawings (FIGS. 3 and 4) in which the
With the stroke until it comes into contact with the upper end surface of the stopper frame 11, it can freely slide in the vertical direction in the figure,
In response to this sliding, the elastic clamping recess 18 elastically protrudes from the clamping recess 15 of the support plate 12. The amount of protrusion (length) is set so as to absorb dimensional errors during processing of the workpiece a.

The chucking device having the above-mentioned configuration can be used even when the workpiece a cannot be reliably clamped due to a dimensional error in machining. comes into elastic pressure contact with the workpiece, securely grips and conveys the workpiece.

[Effect of idea]

As explained above, the chucking device of the present invention is capable of reliably gripping all the workpieces in a device that simultaneously grips three or more workpieces, thereby improving the work efficiency of chucking and conveyance operations. According to the device of the present invention, no matter how many of the three or more workpieces held at the same time have dimensional errors, and no matter where in the row the workpieces with these dimensional errors are located, all the workpieces are It is possible to securely hold the workpiece.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a schematic configuration of a chucking device according to an embodiment of the present invention, Fig. 2 is a plan view of main parts, Fig. 3 is a front view of the same, and Fig. 4 is a cross section taken along the line - in Fig. 3. Figure 5 is a plan view of the main parts of the chuck plate, Figure 6 is a front view of the same, Figure 7 is a side view of the claw plate,
Figure 8 is a front view of the same, Figure 9 is a perspective view of the same, Figure 10 is a side view of the support plate, Figure 11 is a front view of the same, and Figure 12 is a front view of the same.
The figure is a front view showing a schematic configuration of a chucking device according to a conventional example, and FIG. 13 is an explanatory diagram of the same operating state. 1, 2...chuck board, 3, 4...opposite surface, 8
a, 8b... Work elastic clamping mechanism, 9... Recessed step, 10... Guide frame, 11... Stopper frame, 1
2... Support plate, 15... Recessed step for clamping, 16...
Claw plate, 18... Recessed step for elastic clamping, 19... Guide groove, 20... Slide protrusion, 22... Stopper protrusion, 23... Spring.

Claims (1)

[Scope of utility model registration request] In a chucking device comprising a pair of chuck plates that reciprocate so as to widen and narrow the gap between them, and three or more pairs of workpiece holding recesses are formed on opposing surfaces of both chuck plates, the chuck plate The elastic clamping mechanism includes a claw plate with a stopper that slides in the moving direction of the chuck plate against the chuck plate, and an elastic member that elastically biases the claw plate in the direction of clamping the workpiece. A chucking device characterized in that each of the chucking recesses is individually provided.