JP2865546B2 - Switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening and closing device used as an air nipper or the like.

[0002]

2. Description of the Related Art Conventionally, a first conventional example shown in FIG. 5 and a second conventional example shown in FIG. 6 have been used as an air nipper used in an assembly line of electric parts or a site for cutting ears of a cloth material. It is known. In the first conventional example shown in FIG.
Numeral 0 denotes a cylindrical main body, 31 denotes a working head, and 32 denotes a power unit.

[0003] The work head 31 has a pivot
It has a pair of lever bodies 34 that are pivotally supported in a cross shape. Each lever body 34 has a side projecting from the cylindrical main body 30 as an output end 35, and the output end 35 is provided with cutting blades 36 facing each other. The side housed in the cylindrical main body 30 is an input end 37, and the outer end of the input end 37 has a rounded surface. Reference numeral 38 denotes a spring for holding the output end portions 35 in an open state.

[0004] The power section 32 is constituted by a plunger 39 being slidably housed in the cylindrical main body 30. Reference numeral 40 denotes a base for holding the plunger 39 so as not to escape from the cylindrical main body 30. The base 40 has an air supply passage 41 formed therein. 42 is plunger 3
9 is a spring that urges the base 9 toward the base 40. The plunger 39 has a tapered hole 43 that is in contact with the outer side surface (round surface) of the input end 37 of the lever body 34.

Therefore, in the first conventional example, compressed air is supplied to the air supply passage 41 from the state shown in FIG.
As shown in FIG. 7B, the plunger 39 advances to the left in the drawing, whereby the lever body 34 brings the input ends 37 and the output ends 35 closer to each other, and the cutting blade 36 An object to be cut (for example, an electric wire) can be cut by the mutual closing movement. In addition, by stopping the supply of the compressed air and enabling the exhaust, the plunger 39 is retracted rightward in the drawing by the elastic force of the springs 38 and 42, and the levers 34 are connected to the input ends 37 and the output ends 35.
Both are separated from each other, and the state returns to the state of FIG.

That is, in the first conventional example, the power unit 32 is configured as a single-acting air cylinder. On the other hand, in the second conventional example shown in FIG. 6, the power unit 50 is configured as a double-acting air cylinder. Work head 51
In this case, although the lever bodies 52 are pivotally supported with the pivot 53 as a common fulcrum, they are held in a state where they do not cross each other.

In the power unit 50, the plunger 54 is
The lever body 52 has a stepped shape with a small-diameter portion 55 nearer. A large diameter portion for forming the peripheral space 58 is formed. Further, a second air supply path 61 communicating with the peripheral space 58 is formed on the peripheral wall of the cylindrical main body 56, separately from the first air supply path 60 provided on the base 59.

The distal end of the plunger 54 is linked to the input end 64 of the lever 52 via link pins 62 and 63. Accordingly, in the second conventional example, by supplying compressed air to the first air supply passage 60 from the state shown in FIG. 6A, the plunger 5 is supplied as shown in FIG.
4 advances to the left of the drawing, whereby the lever body 52 causes the input ends 64 to move away from each other, and causes the output ends 65 to move closer to each other. Can be cut. Further, the supply of the compressed air in the first air supply path 60 is stopped to enable exhaust, and the compressed air is supplied to the second air supply path 61, so that the plunger 54 retreats to the right in the drawing, and the lever 5
2 causes the input ends 64 to approach each other and the output ends 65 to move away from each other, and returns to the state of FIG.

[0009]

In the first conventional example (see FIG. 5), the output end 35 of the lever body 34 (cutting blade 36).
Since the spring 38 for keeping the open state is constantly repeating compression and expansion, there is a disadvantage that the elasticity is likely to be deteriorated or broken, and maintenance must be performed frequently.

On the other hand, the second conventional example (see FIG. 6) eliminates the need for the spring 38 which is indispensable in the first conventional example, so that the above-mentioned disadvantages of the first conventional example are temporarily solved. Has been reached. However, in the second conventional example, the plunger 54 and both lever bodies 52 are connected with the link pins 62,
Since the link is formed by the link 63, the tubular main body 56 needs to be configured so that it can be divided into the power unit 50 side and the work head 51 side. Also,
Since an air pipe is required for the second air supply path 61, there is a disadvantage that the outer diameter is increased.

In addition, the lever body 52 needs to be detached from the tubular main body 56 as necessary or periodically for replacement or polishing due to chipping or abrasion of the cutting blade 66.
In attaching and detaching the lever body 52, as described above, in parallel with disassembly and assembly of the tubular main body portion 56, the link pin 6
Since it is necessary to disassemble and combine 2,63, there is a disadvantage that it is troublesome.

The present invention has been made in view of the above circumstances, and has a structure in which a spring which causes frequent maintenance is not used. An object of the present invention is to provide an opening / closing operation device such as an air nipper, which can be easily attached and detached.

[0013]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is,
The feature of Ming is that the cylindrical main body and this cylindrical main body
Work head provided with one part protruding from one end of the part
And a power unit provided on the other end side of the cylindrical main body.
The working head protrudes out of the tubular main body.
Part as the output end, and the part housed in the tubular body
A pair of levers serving as input ends are turned around the cylindrical main body.
The power unit is movably pivotally supported, and the power unit includes the cylindrical main body.
A cylindrical plunger slidably housed in a part, and the cylindrical plunger
Core plunger slidably housed in a cylindrical plunger
The tip of the cylindrical plunger is provided with the input
By contacting both outer surfaces of the ends, the output ends can be connected to each other.
A tip of the core plunger configured to approach each other;
The abutting portion contacts the inner surfaces of the input end so that the
The cylindrical end is configured to separate the force ends from each other.
The power part side end of the body part is covered with the first base part.
And a rear end of the cylindrical plunger is connected to a second base portion.
The first base has the second base.
A fluid supply passage facing the base and slidable on the second base
Penetrates and projects into the cylinder and faces the core plunger
And a fluid guide tube. In addition, the
2 The base is formed to be larger in diameter than the cylindrical plunger.
The piston of the double-acting cylinder sliding on the inner surface of the cylindrical main body.
Ton, and the cylindrical plunger has
A communication passage communicating with the outside is formed.

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

According to the present invention, when the output ends of the lever body are brought closer to each other and when they are moved away from each other, the respective pressing pieces are brought into contact with the input ends. That is, once the lever body is opened or closed,
Be those causing the backward movement by a spring, also not name is intended to work with the plunger by the link joint.

[0024]

[0025]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of an opening / closing operation device 1 according to the present invention implemented as an air nipper. FIG. 1A is a plan sectional view showing an open state, and FIG. ) Is a plan sectional view showing the closed state, and FIG. 2 is a partially crushed side view.

In FIGS. 1 and 2, 2 is a cylindrical main body, 3 is a working head, and 4 is a power unit. The tubular main body 2 is formed in a cylindrical shape, and a horizontal groove-shaped head holding portion 5 for holding the working head 3 is provided at one end thereof, and a cylindrical bore is provided at the other end thereof. Is screwed in. On the inner peripheral surface of the cylindrical main body 2, of the portion where the power unit 4 is provided, the inner diameter of about a half near the base 6 is formed slightly larger than the portion near the work head 3. .

The working head 3 has a pair of levers 7 pivotally supported in an intersecting manner around a pivot 8 which is screwed in a state of vertically penetrating the head holding portion 5 of the cylindrical main body 2. . In each lever body 7, the side protruding from the cylindrical main body 2 is an output end 9, and the output end 9 is provided with a cutting blade 10 on the side facing each other. These cutting blades 10 are abutted with the output ends 9 closest to each other. In each lever body 7,
The side housed in the cylindrical main body 2 is an input end 11,
These input end portions 11 are formed such that inner corners facing each other and outer corners opposite to each other have a smooth radius.

As shown in FIG. 2, a long screw of the neck 8a is used for the pivot 8 and the neck 8a
Spring 1 for urging and holding the overlapping state of lever bodies 7
2 has been inserted. It goes without saying that the two levers 7 can be removed from the tubular main body 2 simply by removing the pivot 8. The power unit 4 has a double-cylinder structure composed of an outer driving tool 14 and an inner driving tool 16, of which the outer driving tool 14 is slidable inside the cylindrical main body 2. A cylindrical plunger 13,
The inner driving tool 16 includes the cylindrical plunger 13 and a core plunger 15 slidable therein.

The cylindrical plunger 13 is formed in a cylindrical shape using a resin material as a material, and its tip (left end in the drawing) has a tapered shape in which the inner diameter of the cylinder is increased toward the open end. The tapered portion is a pressing piece 1 for closing movement.
7 is set. When the cylindrical plunger 13 moves to the left in the drawing, the closing movement pressing piece 17 can come into contact with the outer surface (corner round surface) of the input end 11 of the lever body 7.

A base portion 18 is integrally provided at the rear end of the cylindrical plunger 13 so that the core plunger 15 is provided.
Has prevented escape. The base portion 18 is formed to be slightly larger in diameter than the outer diameter of the cylindrical plunger 13, and fits in the larger diameter portion of the cylindrical main body 2. Therefore, the step portion 1 in the large diameter portion of the cylindrical main body portion 2
9 and a step portion 20 in the base portion 18 of the cylindrical plunger 13 are opposed to each other along the axial direction, so that a peripheral space 21 is formed between the two. This surrounding space 21
Are expanded and contracted by sliding of the cylindrical plunger 13.

The core plunger 15 is made of a metal material and formed in a bullet shape, and a tapered portion at the tip (left end side in the drawing) of the core plunger 15 is used as an opening pressing piece 22. The opening movement pressing piece 22 is attached to the core plunger 15.
When it moves to the left in the drawing, it can contact the inner side surface (corner round surface) of the input end 11 of the lever body 7.

A fluid supply passage 23 facing the base 18 of the cylindrical plunger 13 is formed in the base portion 6 of the tubular main body 2. A fluid guide tube 24 is provided that penetrates the base 18 and projects into the cylinder. This fluid guide tube 2
The inside of 4 is a fluid guide passage 25 facing the base of the core plunger 15. A communication passage 26 is formed on the outer peripheral surface of the cylindrical plunger 13 to communicate the inside of the cylinder with the peripheral space 21.

Therefore, in the first embodiment, FIG.
By supplying compressed air to the fluid supply passage 23 from the state shown in FIG. 2, the cylindrical plunger 13 advances to the left in the drawing as shown in FIG. Both outer surfaces of the portion 11 are pressed inward. Therefore, the output ends 9 of the lever bodies 7 come closer to each other, and the object to be cut (for example, an electric wire) can be cut by the closing movement of the cutting blades 10. When the input ends 11 of both lever bodies 7 approach each other as described above,
Since the inner side surface of the input end portion 11 presses the opening pressing piece 22 of the core plunger 15, the core plunger 15 is retracted rightward in the drawing.

On the other hand, the supply of the compressed air to the fluid supply passage 23 is stopped to make it possible to exhaust the air, and the compressed air is supplied to the fluid guide passage 25, so that the core plunger 15 as shown in FIG. Moves forward, and the opening pressing piece 22 presses both inner side surfaces of the input ends 11 of the both lever bodies 7 outward. In addition, the compressed air from the fluid guide passage 25 flows into the peripheral space 21 through the communication passage 26 and acts to push the step 20 of the cylindrical plunger 13, so that the cylindrical plunger 13 retreats. As a result, the input ends 11 of both lever members 7 are separated from each other, and the cutting blades 10 open.

That is, the power unit 4 of the first embodiment is configured as a single-acting hydraulic cylinder in which the inner driving tool 16 advances the core plunger 15 by fluid pressure and retreats by the cam. And the outer drive 14
However, it is configured as a double-acting fluid pressure cylinder in which the advance and retreat of the cylindrical plunger 13 are both performed by fluid pressure.

FIG. 3 shows a second embodiment of the switching device 1 according to the present invention.
An example is shown. The difference between the second embodiment and the first embodiment is that the lever body 7 is pivotally supported without intersecting each other while using the fulcrum portions as a common fulcrum. Accordingly, the distal end of the cylindrical plunger 13 is connected to the input end 11 of each lever body 7.
The outer end surfaces of the levers 7 are used as opening push pieces 22 that separate the output ends 9 from each other by coming into contact with each other. The closing pressing piece 17 is brought into contact with the side surface to bring the output ends 9 closer to each other.

The other constructions and operations are substantially the same as those of the first embodiment. Therefore, the same members are given the same reference numerals and their detailed explanation is omitted. FIG. 4 schematically shows a reference example of the opening / closing operation device 1, in which one (lower side in the drawing) of the lever body 7 is fixed and the other (upper side in the drawing) of the lever body 7 is fixed. The opening movement pressing piece 22 and the closing movement pressing piece 17 provided integrally with each other with respect to the input end 11 can be brought into contact with and separated from each other. In addition, these two pressing pieces 22, 17 are
It is designed to be driven by one driving tool 14.

[0038]

According to the present invention, the above-mentioned structure is provided, and when pressing the output ends of the lever body toward each other or separating them from each other, each of the pressing pieces is moved to the input end. And a link joining structure with a spring for returning and a plunger is not adopted. For this reason, there is no risk of the maintenance being unnecessarily frequent, and the attachment / detachment of the lever body to / from the tubular main body can be extremely easily performed.

In order to drive the opening movement pressing piece and the closing movement pressing piece, different driving tools are used, a fluid pressure cylinder is used as each of these driving tools, and both driving tools have a double cylinder structure. Means such as disposing these driving tools on the rear side of the lever body are taken, so that the structure can be prevented from becoming complicated and large as a whole, and can be made compact. Therefore, it can be easily incorporated into an automatic machine or the like.

[Brief description of the drawings]

FIG. 1 is a plan sectional view showing a first embodiment of an opening / closing operation device according to the present invention, wherein (a) is an open state and (b) is a closed state.

FIG. 2 is a partially crushed side view of the first embodiment.

3A and 3B are plan sectional views showing a second embodiment of the opening / closing operation device according to the present invention, wherein FIG. 3A is an open state and FIG. 3B is a closed state.

FIG. 4 is a schematic view showing a reference example of the opening and closing operation device .

5A and 5B are plan sectional views showing a first conventional example of the opening / closing operation device, wherein FIG. 5A is an open state and FIG. 5B is a closed state.

FIGS. 6A and 6B are plan sectional views showing a second conventional example of the opening / closing operation device, wherein FIG. 6A is an open state and FIG. 6B is a closed state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Opening-and-closing operation device 2 Cylindrical main body part 3 Working head 4 Power part 6 Base part (cylindrical main body part) 7 Lever body 8 Pivot part 9 Output end part 10 Cutting blade 11 Input end part 13 Cylindrical plunger 14 Outside driving tool 15 Core plunger 16 Inner driving tool 17 Closing pressing piece 18 Base (cylindrical plunger) 19 Step (cylindrical main body) 20 Step (cylindrical plunger) 21 Circumferential space 22 Opening pressing piece 23 Fluid supply path 24 Fluid guide pipe 25 Fluid guide path 26 Communication path

Claims (1)

(57) [Claims] 1. A cylindrical main body (2), a work head (3) provided at one end of the cylindrical main body (2) so as to protrude partially, and a cylindrical main body (2). And a power unit (4) provided at the other end of the cylindrical body. The working head (3) has a portion protruding outside the cylindrical body (2) as an output end (9). A pair of lever bodies (7) having an input end part (11) as a part housed in the part (2), rotatably supported by the cylindrical body part (2); (4) A cylindrical plunger (13) slidably housed in the cylindrical main body (2) and a core plunger (Slidably housed in the cylindrical plunger (13)). 15), wherein the distal end of the cylindrical plunger (13) is in contact with both outer surfaces of the input end (11) to form the output ends (9) with each other. And the distal end of the core plunger (15) is brought into contact with both inner surfaces of the input end (11) to separate the output ends (9) from each other. The end of the cylindrical main body (2) on the power unit side is covered with a first base (6), and the rear end of the cylindrical plunger (13) is a second base. The first base portion (6) has a fluid supply path (23) facing the second base portion (18), and the first base portion (6) slides on the second base portion (18). A fluid guide tube (24) penetrating as much as possible and projecting into the cylinder and facing the core plunger (15) .
Ri, the second base portion (18), the tubular plunger (1
It is formed larger in diameter than 3), and is formed in the cylindrical main body (2).
It is configured in the piston of a double acting cylinder that slides surfaces, said tubular plunger (13) and its cylinder inside and the outside
An opening / closing operation device, wherein a communication passage (26) for communication is formed .