JP2001293627A - Cramping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cramping device capable of placing a work at a predetermined position by preventing the work from levitating during cramping. SOLUTION: The cramping device cramps the work on a reference surface so as to be caught in with a plurality of cramp members comprising a cramp member main body and a cramp part which is integral with or separate from the cramp member main body and provided so as to be elastically displaceable. The cramp part is reset in one direction during unclamping, elastically displaced in the other direction until it is abuts on the cramp part main body during the cramping, and the work is thereby cramped while pressed on the reference surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamping device for clamping a work on a reference surface by sandwiching the work with a plurality of clamp members. The present invention relates to a device devised so that it can be prevented from being easily changed.

[0002]

2. Description of the Related Art A clamp device is generally constructed as follows. First, there is a pair of clamp members, and the pair of clamp members are configured to be relatively detachable. Then, by relatively approaching each other, the workpiece placed between them and clamped so as to sandwich the work placed on the reference surface is clamped.

[0003]

According to the above-mentioned conventional configuration, there are the following problems. In the case of a conventional clamp device, a pair of clamp members are relatively close to each other to clamp the work on the reference surface, but at this time, an upward force acts on the work, As a result, there has been a problem that the workpiece is slightly floated from the reference plane during clamping. in this way,
If the workpiece is clamped while floating above the reference surface, there is a problem that it becomes impossible to perform highly accurate processing. In other words, even if the accuracy of various types of processing is ensured, the work is floating from the reference plane and its position is shifted in the first place, so that high dimensional accuracy cannot be obtained after all. . Incidentally, there has been proposed a mechanism provided with a mechanism for pressing the work against the reference surface separately from the pair of clamp members at the time of clamping. In this case, the work is pressed against the reference surface separately from the pair of clamp members. Therefore, there has been a problem that the configuration is complicated and the size of the apparatus is increased.

The present invention has been made based on such a point, and an object of the present invention is to provide a clamp device which can prevent a workpiece from floating from a reference surface during clamping and can be positioned at a predetermined position. Is to do.

[0005]

According to a first aspect of the present invention, there is provided a clamp apparatus for clamping a workpiece on a reference surface by a plurality of clamp members. The member is composed of a clamp member main body and a clamp portion which is integrated with or separate from the clamp member main body and is provided so as to be elastically displaceable. The clamp portion returns in one direction when not clamped. When the workpiece is clamped, the workpiece is urged through the work and elastically displaced in the other direction until it comes into contact with the clamp body, whereby the work is clamped while being pressed against the reference surface. According to a second aspect of the present invention, there is provided the clamping device according to the first aspect, wherein a gap is provided in the single member, and the single member is partially divided into two through the gap to form one of the clamping member main bodies. The other is a clamp portion, wherein the clamp portion is integrated with the clamp member main body and elastically displaceable within the range of the gap. According to a third aspect of the present invention, there is provided the clamp device according to the second aspect of the present invention, wherein the clamp portion is bisected so as to be more distant from the main body of the clamp member toward the tip thereof. According to a fourth aspect of the present invention, there is provided the clamp device according to the first aspect, wherein the clamp portion is incorporated separately from the clamp member main body.

That is, in the case of the clamp device according to the present invention, the clamp member comprises a clamp member body and a clamp portion, and the clamp member body and the clamp portion are provided integrally or separately, and the clamp portion is provided. It is configured to be elastically displaceable with respect to the clamp member main body. The clamp portion is elastically returned when not clamped, and is elastically displaced by being urged via a work when clamped. In other words, the work is pressed against the reference surface by elastic displacement during clamping, thereby preventing the work from floating above the reference surface during clamping.
Further, with respect to how to configure the clamp member body and the clamp portion, for example, by providing a gap in a single member and partially bisecting the single member through the gap, one of the clamp member body and It is conceivable that the other part is used as a clamp part. That is, at the time of non-clamping, the clamp portion is elastically restored and a gap is formed between the clamp portion and the clamp member main body. On the other hand, at the time of clamping, the clamp portion is elastically displaced within the range of the gap and clamps the work while pressing it against the reference surface. In this case, it is conceivable to divide the clamp portion into two parts so as to be more apart from the clamp member body toward the tip end, whereby a force for pressing the work against the reference surface can be generated more effectively. .
As a means for forming the gap, for example, adoption of a wire cutting method is considered. The gap may be formed by a method other than the wire cutting method. In addition, it is conceivable to incorporate the clamp portion separately from the clamp member main body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view of the clamp member 1, and FIG. 2 is a sectional view taken along line II-II of FIG. First, the clamp member 1 includes a clamp member main body 3, and the clamp member main body 3 has a clamp portion 5.
Are integrated and provided in an elastically displaceable state. Although the clamp member body 3 and the clamp portion 5 are initially a single member, gaps 7, 9, and 11 are formed by applying a wire cutting method to the clamp member body 3 and the clamp portion 5. 5 is partially divided into two.

The cutting by the wire cutting method will be described in more detail. As shown in FIG. 2, first, a gap 7 is formed by a first wire cutting. Next, hole 13
And a second wire cut is performed using the hole 13, thereby forming the gap 9. In addition, 3
The gap 11 is formed by the second wire cutting. Through such steps, the clamp member main body 3 and the clamp portion 5 can be partially divided into two. Then, the clamp portion 5 is provided integrally with the clamp member main body 3 via bridge portions 15 and 17 arranged vertically, and is provided in a state capable of elastic displacement. FIG. 3 is an enlarged view of the gaps 9 and 11. The gap 7 is in the same state as the gap 11. As the clamp device, a pair of clamp members 1 having the above-described configuration is arranged, and the pair of clamp members 1, 1 are relatively separated from each other, and a work 21 (FIGS. 4 and 5) disposed therebetween. ) Will be clamped appropriately.

Here, the elastic displacement of the clamp portion 5 will be described. First, at the time of non-clamping, that is, when no force acts on the clamp portion 5 via the work 21, as shown in FIG. 3, the clamp portion 5 is in a state of elastically returning to the upper right in FIG. 3. . Therefore, the gaps 7, 9,
11 is opened as it is. On the other hand, when a force is applied via the work 21, the clamp portion 5 is elastically displaced in the direction indicated by the arrow a in FIG. That is, the clamp portion 5 is centered on the base A of the bridge portion 15.
The side is elastically displaced against the elastic force of the bridge portion 15. This is the same for the upper bridge 17 side. Then, the displacement is allowed until the clamp portion 5 comes into contact with the clamp member main body 3.

The operation will be described based on the above configuration. First, as shown in FIG. 4, a pair of clamp members 1 and 1 are opposed to each other, and a work 21 is disposed between the pair of clamp members 1 and 1 and is appropriately clamped. By bringing the pair of clamp members 1 and 1 relatively close to each other, a state as shown in FIG. 4 is obtained. Various means can be considered as a means for relatively separating the pair of clamp members 1 and 1, and for example, a screw / nut mechanism or the like can be considered. The state shown in FIG. 4 is a state where the work 21 has not yet been completely clamped, and the clamp portions 5 and 5 of the pair of clamp members 1 and 1 are in contact with the work 21.

When the pair of clamp members 1, 1 is further moved closer from the state shown in FIG. 4, the clamp portions 5, 5 of the respective clamp members 1, 1 are urged obliquely downward. For example, in the case of the clamp member 1 on the left side in FIG.
The clamp portion 5 is urged obliquely downward to the left against the elastic force of the bridge portions 15 and 17. Similarly, in the case of the clamp member 1 on the right side in FIG.
It is urged obliquely downward and to the right against the elastic force of 5 and 17. As a result, a state as shown in FIG. 5 is obtained.

In FIG. 5, the respective clamp portions 5, 5 are elastically displaced and are in contact with the clamp member main bodies 3, 3. As a result, the workpiece 21 is completely clamped. At this time, as described above, the clamp portions 5, 5 of the clamp members 1, 1 are used.
Is biased obliquely downward, so that the work 21
A force that presses this downward acts. As a result, the floating of the work 21 is regulated, and the work 21 is clamped in a state of being in close contact with the table surface 23 as a reference surface.

According to this embodiment, the following effects can be obtained. First, the floating of the work 21 at the time of clamping is restricted, and the work 21 can be clamped while being pressed against the table surface 23. This is because, when the clamp portions 5 and 5 of the clamp members 1 and 1 are urged obliquely downward during clamping, a force acts on the work 21 downward, that is, against the table surface 23. Further, in the present embodiment, the clamp member 1 has an extremely simple configuration, that is, the gap members 7, 9 and 11 are simply formed by performing a predetermined wire cut on a single member. Therefore, the configuration is not complicated, and the apparatus is not enlarged. Incidentally, in the case of this embodiment, the work 21
Does not require a separate device in addition to the pair of clamp members 1 and 1 to press the table against the table surface 23, and can exhibit both the clamp function and the press function with a very simple configuration. It is.

Next, a second embodiment of the present invention will be described with reference to FIGS. In the case of the second embodiment, an example is shown in which the configuration of the clamp member is further simplified as compared with the case of the first embodiment. First, the clamp member 31 is composed of a clamp member main body 33 and a clamp portion 35 which is integrated with the clamp member main body 33 and provided so as to be elastically displaceable. That is, a single member is subjected to wire cutting to form a gap 37, and the clamp member main body 33 and the clamp portion 35 are partially divided with the gap 37 interposed therebetween. In the case of the clamp member 31, the clamp portion 35 is displaced in the direction shown by the arrow b in FIG. 8 during clamping, thereby clamping a work (not shown) while pressing it downward. Therefore, the same effect as that of the first embodiment can be obtained, and the structure of the clamp member 31 is further simplified, so that the manufacture thereof becomes easy. Specifically, the gap 37
Since only one wire needs to be provided, it is only necessary to perform the wire cut once, and it is not necessary to perform an operation such as making a hole for performing the wire cut.

In this case, as shown in FIG. 7 (a), when the gap 37 is set to be relatively small, for example, the work 39 to be clamped projects above the clamp member 31. In some cases, it is expected that sufficient clamping will not be obtained. Therefore, as shown in FIG. 7B, when setting the gap 37 between the clamp portion 35 and the clamp member main body 33, the size of the gap 37 is gradually increased toward the tip. Can be considered. Thereby, the amount of displacement of the clamp portion 35 can be increased, and the work 3
9 can be generated more effectively. Therefore, the work 39 is connected to the clamp member 3.
Even in the case of protruding above 1, it is possible to reliably press against the reference surface and clamp.

Next, a third embodiment of the present invention will be described with reference to FIGS. In this case, as shown in FIG. 10, a pair of clamp members 41 and 43 are opposed and arranged. The clamp member 41 includes a clamp member main body 45 and a clamp portion 47 which is provided integrally with the clamp member main body 45 so as to be elastically displaceable. That is, a gap 49 is formed by wire-cutting a single member (shown in an enlarged manner in FIG. 11), and the clamp member body 45 and the clamp portion 47 are partially formed through the gap 49. Is to divide.

Similarly, opposed and arranged clamp members 4
Reference numeral 3 denotes a clamp member main body 51 and a clamp portion 53 which is integrated with the clamp member main body 51 and is elastically displaceable. That is, by performing wire cutting on a single member, the gap 55
(Shown in an enlarged manner in FIG. 11), and is partially divided into the clamp member main body 51 and the clamp portion 53 through the gap 55.

Then, as shown in FIG.
When the clamp members 41 and 43 are brought close to each other in order to clamp the
In FIG. 11, the clamp member 5 is urged diagonally to the lower left.
The one clamp portion 53 is urged obliquely downward and to the right. Thereby, the work 57 is pressed downward, and is prevented from floating from the table surface 58 as a reference surface, and is clamped in a state where it is securely located at a predetermined position. The work 57 has a substantially semi-cylindrical shape, its both ends are clamped by the clamp members 41 and 43, and its arc-shaped curved surface 57a is ground by a grindstone 59.

Incidentally, in the case shown in FIGS. 9 and 10,
As shown in FIG. 9, a workpiece 57 clamped below the disk-shaped grindstone 59 is repeatedly rocked at a predetermined angle (α degrees). Thus, the arc-shaped curved surface 57a of the work 57 is ground. Therefore, the same effects as those of the first and second embodiments can be obtained.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. In the first to third embodiments, a case where a pair of clamp members are disposed and a workpiece is clamped by the pair of clamp members has been described as an example. In the case of the form, three clamp members 61, 63, 65 are arranged, and the work 67 is clamped by these three clamp members 61, 63, 65.

First, the case shown in FIGS. 12 and 13 will be described. As shown in FIGS. 13 and 14, the clamp member 61 includes a clamp member main body 69 and a clamp portion 71 provided integrally with the clamp member main body 69 and capable of elastic displacement. A gap 73 formed by wire cutting is formed between the clamp member body 69 and the clamp portion 71 as shown in an enlarged manner in FIG. The clamp portion 71 elastically displaces within the range of the gap 73 during clamping.
The other clamp members 63 and 65 have the same configuration. That is, the clamp member 63 is provided with a clamp member body 75 and a clamp portion 77 which is integrated with the clamp member body 75 and is provided so as to be elastically displaceable.
A gap 79 is provided between the clamp member main body 75 and the clamp portion 77.
The clamp member 65 is composed of a clamp member main body 81 and a clamp portion 83 which is integrated with the clamp member main body 81 and is provided so as to be elastically displaceable. A gap 85 is provided between them.

According to the above configuration, at the time of clamping, the clamp portions 71, 7 of the three clamp members 61, 63, 65 are provided.
7, 83 are elastically displaced obliquely downward within the range of the gaps 73, 79, 85 during clamping.
Clamp while pressing downward. Therefore, the workpiece 87 can be clamped at a predetermined position while preventing the workpiece 87 from floating. In the configurations shown in FIGS. 12 to 14, the configurations shown in FIGS. 15 and 16, and the configurations shown in FIGS. 16 and 17, the shape of the clamp member and the shape and size of the work 87 are different. Is the same.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. In the first to fourth embodiments, the clamp member in which the clamp member main body and the clamp portion are integrated has been described as an example, but the clamp member according to the fifth embodiment is described. In this case, an example is shown in which the clamp member is configured by assembling the clamp portion into the clamp member body while the clamp portion is separate from the clamp member body.

First, in the case shown in FIG.
Work support members 99 are arranged at three positions at 120 degrees above (note that only one of the three positions is shown in FIG. 19). Also, the clamp members 90 are arranged at the positions of 120 degrees so as to be alternate with the three work support members 99, in addition, FIG.
Only one of the three middle parts is shown). The clamp member 90 includes a clamp member main body 91 and a clamp portion 93 provided separately from the clamp member main body 91 and incorporated.

The fitting recess 9 is provided in the clamp member body 91.
1a is formed, and the clamp portion 93 is movably fitted to the fitting concave portion 91a via the fitting convex portion 93a. The clamp portion 93 is rotatably mounted around a fitting portion formed by the fitting concave portion 91a and the fitting convex portion 93a as a fulcrum when the clamp portion 93 is not clamped. A support member 101 is provided below the clamp 93.
Are arranged so as to restrict unnecessary downward rotation of the clamp portion 93.

When clamping the work 103, the clamp members 90 arranged at three positions move inward. Thus, the distal end portion 93b of the clamp portion 93 comes into contact with the outer peripheral surface of the work 103. From there, when the clamp is further clamped, a force acts on the clamp portion 93 such that the clamp portion 93 is rotated counterclockwise in FIG. 19 with the fitting portion formed by the fitting concave portion 91a and the fitting convex portion 93a as a fulcrum. . Thus, the work 103 is pressed downward, that is, onto the work support members 99 arranged at three places. In this way, the work 103 is clamped while being pressed downward. Therefore, the same effects as in the first to fourth embodiments can be obtained. 20 is basically the same as the configuration shown in FIG. 19, except that the shape of the work 107 and the configuration of the work support member 105 are different.

It should be noted that the present invention is not limited to the first to fifth embodiments. For example, in the first to fourth embodiments, in any state, Whether to provide them may be arbitrarily set. or,
The size and range of the gap are not limited. Further, the number of the clamping members constituting the clamping device is not limited. Further, the method of forming the gap is not limited to the wire cutting method.

[0028]

As described above in detail, according to the clamp device of the present invention, first, the floating of the work from the reference surface at the time of clamping can be restricted and the work can be clamped at a predetermined position. Became. This is because, when the clamp portion of the clamp member is urged at the time of clamping, a force for pressing the work against the reference surface acts. In addition, the clamp member has a very simple configuration,
That is, a gap is simply formed in a single member, or a separate member, which simply incorporates a clamp portion into a clamp member body. Therefore,
It does not complicate the configuration or increase the size of the device.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of the present invention, and is a front view of a clamp member.

FIG. 2 is a view showing the first embodiment of the present invention, and is a sectional view taken along line II-II of FIG.

FIG. 3 is a diagram showing the first embodiment of the present invention, and is an enlarged cross-sectional view showing a part III in FIG. 2;

FIG. 4 is a view showing the first embodiment of the present invention, and is a cross-sectional view showing a state before a work is sandwiched and completely clamped by a pair of clamp members.

FIG. 5 is a view showing the first embodiment of the present invention, and is a cross-sectional view showing a state where the work is sandwiched between a pair of clamp members and completely clamped.

FIG. 6 is a view showing a second embodiment of the present invention, and is a front view of a clamp member.

FIG. 7 is a diagram showing a second embodiment of the present invention.
FIG. 7A is a sectional view taken along line VII-VII of FIG.
(B) is sectional drawing which shows another form.

FIG. 8 is a view showing a second embodiment of the present invention, and is an enlarged sectional view showing a portion VIII in FIG. 7;

FIG. 9 is a view showing a third embodiment of the present invention, and is a front view of a clamp member.

FIG. 10 is a diagram showing a third embodiment of the present invention, and FIG.
It is XX sectional drawing of.

FIG. 11 is a diagram showing a third embodiment of the present invention, and FIG.
FIG. 4 is an enlarged cross-sectional view showing an XI part of FIG.

FIG. 12 is a view showing a fourth embodiment of the present invention, and is a plan view of a clamp device.

FIG. 13 is a view showing a fourth embodiment of the present invention, and is a partial side view of a clamp device.

FIG. 14 is a diagram showing a fourth embodiment of the present invention, and FIG.
FIG. 4 is an enlarged cross-sectional view showing an XIV portion of FIG.

FIG. 15 is a view showing a fourth embodiment of the present invention, and is a plan view of a clamp device.

FIG. 16 is a view showing a fourth embodiment of the present invention, and is a partial side view of a clamp device.

FIG. 17 is a view showing a fourth embodiment of the present invention, and is a plan view of a clamp device.

FIG. 18 is a view showing a fourth embodiment of the present invention, and is a partial side view of a clamp device.

FIG. 19 is a view showing a fifth embodiment of the present invention, and is a front sectional view of a clamp device.

FIG. 20 is a view showing a fifth embodiment of the present invention, and is a front sectional view of a clamp device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clamp member 3 Clamp member main body 5 Clamp part 7 Gap 9 Gap 11 Gap 15 Bridge part 17 Bridge part 21 Work 23 Table

Claims (4)

[Claims] 1. A clamp device for clamping a workpiece on a reference surface by sandwiching the workpiece with a plurality of clamp members, wherein the clamp member is integral with or separate from the clamp member main body and the clamp member main body. And the clamp portion is provided so as to be elastically displaceable. When the clamp portion is not clamped, the clamp portion returns in one direction. When the clamp portion is clamped, the clamp portion is urged via a work until it comes into contact with the clamp portion main body. A clamping device which elastically displaces in the other direction and thereby clamps a workpiece while pressing the workpiece against the reference surface. 2. The clamping device according to claim 1, wherein a gap is provided in the single member, and the single member is divided into two parts through the gap to form one as a clamp member body and the other as a clamp portion. The clamp device is characterized in that the clamp portion is integrated with the clamp member body and elastically displaceable within the range of the gap. 3. The clamp device according to claim 2, wherein the clamp portion is bisected so as to be more distant from the clamp member body toward the tip. 4. The clamp device according to claim 1, wherein the clamp portion is incorporated separately from the clamp member main body.