JP2000042851A - Cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively use an installation space by reducing the entire cylinder in its size and to reduce manufacturing costs. SOLUTION: This cylinder is provided with a cylinder part 12, and a displaceable arm 64 integrated with a piston rod with the aid of a knuckle joint 70 connected to one end of the piston rod 26. A first body 58 and a second body 60 are provided with a first guide groove 68 for guiding the arm 64 in the axial direction with the arm 64 retained in a state generally intersecting the axis, and a second guide groove 84 for guiding the arm 64 in such a way that the arm 64 may be turned and moved by the given angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, clamping a work or positioning the work via a reference pin by an arm which rotates by a predetermined angle and is linearly displaced under the action of a piston. To a cylinder device capable of doing so.

[0002]

2. Description of the Related Art Conventionally, cylinders have been used to clamp components such as automobiles when welding them. The cylinder for this clamp is
It has the function of converting the linear movement of the piston displaced under the action of the pressurized fluid supplied into the main body into the rotational movement of the arm, and clamping the work via the arm which rotates by a predetermined angle.

In the prior art, when a reference pin is connected to one end of the arm, and the reference pin is inserted into a positioning hole formed in the work by press-fitting, the arm is positioned. A first cylinder that is rotatable at a predetermined angle and a second cylinder that linearly moves the first cylinder up and down under the reciprocating action of a piston rod connected to the first cylinder are required.

In other words, a first cylinder for displacing a reference pin connected to the arm to a position facing a positioning hole of a work under the action of rotation of the arm, and a cylinder tube connected to the first cylinder. By lowering the first cylinder linearly under the action of displacement of the piston rod, the reference pin connected to one end of the arm is integrally assembled with the second cylinder for press-fitting the reference pin into the positioning hole of the work. Is done.

[0005]

However, in the prior art, a first pin for pivotally displacing the arm to a position where the reference pin connected to one end of the arm faces the positioning hole.
Two cylinders including a cylinder and a second cylinder that presses the reference pin into the positioning hole by lowering the first cylinder in a straight line are required. There is a disadvantage that it cannot be used.

SUMMARY OF THE INVENTION The present invention has been made to overcome the above-mentioned disadvantages, and provides a cylinder device capable of reducing the manufacturing cost while reducing the size of the entire device to effectively use the installation space. The purpose is to:

[0007]

In order to achieve the above object, the present invention provides a piston which reciprocates along a cylinder chamber under the action of a pressure fluid supplied from a fluid pressure input / output port; A cylinder portion having a piston rod connected thereto and displaced integrally with the piston, a body fixed to one end of the cylinder portion, and a connecting member connected to one end of the piston rod; An arm provided so as to be freely displaceable integrally with the piston rod, wherein the body guides the arm along the axial direction of the body while holding the arm substantially perpendicular to the axis of the body. The present invention is characterized in that one guide means and a second guide means for guiding the arm so as to be rotatable by a predetermined angle are provided.

In this case, the first guide means comprises a linear first guide groove for guiding the connecting member along the axial direction of the body, and the second guide means guides a roller connected to the arm. The second guide groove includes a linear portion formed linearly along the axial direction of the body, and an arc portion formed in an arc shape continuous with the linear portion. Consists of A relief groove for a roller that slides along the second guide groove is formed in a portion adjacent to the second guide groove. The arm is pivotally mounted on a connecting member, and is provided to be rotatable by a predetermined angle around a rod pin that supports the arm.

The body is composed of a first body and a second body which are symmetrically divided into two, and a first guide groove and a second guide groove are respectively formed in the first body and the second body. They are provided symmetrically facing each other. The body is provided with a stopper member for locking the arm.

According to the present invention, after the arm rotates by a predetermined angle under the guiding action of the second guiding means, the arm is moved by the body under the guiding action of the first guiding means following the rotating action. The arm is displaced along the axial direction of the body while being held substantially perpendicular to the axis.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a cylinder device according to the present invention will be described below in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 denotes a cylinder device according to an embodiment of the present invention. The cylinder device 10 includes a cylinder section 12 and an arm operation section 16 connected to an upper portion of the cylinder section 12 via a substrate 14.

As shown in FIG. 3, the cylinder portion 12 is formed of a rectangular parallelepiped bottomed cylindrical body.
8a, 18b, a set of fluid pressure input / output ports 20
a and 20b are formed in the cylinder tube 22;
A piston 24 reciprocates along 18b and a piston rod 26 connected to the piston 24 and displaced integrally with the piston 24.

A ring-shaped magnet 28 and a piston packing 30 are formed on the outer peripheral surface of the piston 24 through an annular groove.
A ring-shaped damper member 32 is provided on one end surface of the piston 24 via a concave portion.

A rod cover 3 for airtightly closing the cylinder chambers 18a, 18b is provided at one end of the cylinder tube 22.
4 is mounted via a retaining ring 36 and the rod cover 3
4, a ring-shaped damper member 38 is provided via a recess. A hole is formed in the center of the rod cover 34 in which the piston rod 26 is slidably displaced. A rod packing 40 and a bush 42 are mounted on the sliding surface of the rod cover 34. The piston packing 30 and the rod packing 40 may be formed of an elastic material such as NBR, for example. In addition, on the three side surfaces along the circumferential direction of the cylinder tube 22, long grooves 44a to 44c for mounting sensors (not shown) are formed so as to extend along the axial direction (see FIG. 2). ).

As shown in FIG. 2, the substrate 14 is fixed to the cylinder tube 22 through screw members 48 which are screwed into screw holes 46 formed at four corners. A hole 50 having a circular cross section in which the piston rod 26 is displaced along the up-down direction is formed.

The arm operation section 16 is fixed to a first projection 52 and a second projection 54 projecting from the substrate 14 via a screw member 56, and is divided into two substantially symmetrically. A first body 58 and a second body 60;
A pair of cover members 62a and 62b mounted on the first body 58 and the second body 60, respectively. In addition, the first body 58 and the second body
The body 60 is formed with an opening 66 through which an arm 64 described later rotates by a predetermined angle (see FIG. 1).

As shown in FIG. 2, the arm operating portion 16 has first guide grooves (first guide means) formed on inner wall surfaces of the first body 58 and the second body 60 facing each other. A knuckle joint (connecting member) 70 slidingly displaced along 68;
The arm 64 is sandwiched between the forked portions 72a and 72b formed through the rod pin 74 via a rod pin 74, and is provided to be rotatable by a predetermined angle around the rod pin 74.

As shown in FIG. 2, the knuckle joint 70 has a threaded portion 76 connected to one end of the piston rod 26, and bifurcated portions 72a and 72b which are branched substantially in parallel at a predetermined interval. The forked part 7
On both sides of 2a and 72b, flat portions 78 which are sliding surfaces with respect to the first guide groove 68 are formed. The rod pin 74 is prevented from rotating via a pin member 80 locked on the knuckle joint 70.

The first body 58 and the second body 60
A second guide groove (second guide means) 84 for guiding rollers 82a and 82b, which will be described later, is formed on the inner wall surface and the outer wall surface of the first body 58 and the second body 60. And an opening penetrating therethrough.
In this case, the second guide groove 84 has a linear portion 84a formed close to the first guide groove 68 and substantially parallel to the first guide groove 68, and an arc shape continuous with an upper portion of the linear portion 84a. And an arc portion 84b formed.

A relief groove 86 (see FIG. 9) extending along the shape of the second guide groove 84 is formed on the outer wall surfaces of the first body 58 and the second body 60. Are rollers 82 sliding along the second guide groove 84
It has a function as a relief for the sliding surfaces a and 82b.

As shown in FIG. 2, a roller pin 90 extending in a direction perpendicular to the axial direction is connected to one end of the long arm 64 as shown in FIG.
At both ends of the roller pin 90 along the longitudinal direction, a pair of ring-shaped spacers 92a with an arm 64 therebetween,
92b and rollers 82a and 82b are mounted. A set of spacers 92a, 92b and rollers 82a, 82b
Are pin members 94 inserted into small holes formed at both ends.
Are respectively locked to the roller pins 90. In this case, the width of the spacers 92a and 92b is formed to be substantially the same as the thickness of the forked portions 72a and 72b of the knuckle joint 70 (see FIG. 9).

The arm 64 has a pair of stopper pins (stopper members) 96a, 9 supported by a pair of first body 58 and second body 60 opposed to each other.
6b engages with a pair of grooves 98a, 98b
Are formed at predetermined intervals, and the pair of grooves 98a,
98b are set to different heights in the vertical direction as shown in FIG.

The knuckle joint 70 is connected to one end of the piston rod 26 of the cylinder portion 12 via a screw portion 76. The knuckle joint 70, the arm 64, the rollers 82a and 82b, It is provided so as to be displaced integrally.

The cylinder device 10 according to the present embodiment
Basically, the configuration is as described above. Next, the operation and operation and effect will be described.

First, a reference pin 10 is attached to one end of the arm 64.
0, and a pressure fluid supply source (not shown) is connected to a pair of fluid pressure input / output ports 20a and 20b of the cylinder section 12 via a tube (not shown) or the like. Note that, as shown in FIG. 5, a state in which the arm 64 stands upright along the vertical direction will be described below as an initial position.

In the initial position shown in FIG. 5, a pressure fluid supply source (not shown) is energized to
A pressurized fluid (for example, compressed air) is supplied to the cylinder chamber 18a via a. The piston 24 is pressed downward under the action of the pressure fluid supplied to the cylinder chamber 18a, and the piston 24 descends. The other fluid pressure input / output port 20b is open to the atmosphere under the switching action of a switching valve (not shown).

Accordingly, the knuckle joint 70 connected to one end of the piston rod 26 linearly descends along the first guide groove 68, and the arm 64
Under the guide action of the rollers 82a and 82b that slide along the arc portion 84b of the second guide groove 84, the second guide groove 84 turns around the rod pin 74 in the direction of arrow A (see FIG. 6).

As shown in FIG. 7, when the arm 64 is rotated by a predetermined angle (set to about 90 degrees in the present embodiment) to reach a substantially horizontal state, the rollers 82a and 82
2b is guided by a linear portion 84a that is continuous with the arc portion 84b of the second guide groove 84. That is, when the arm 64 is rotated by a predetermined angle to be in a substantially horizontal state, the reference pin 100 connected to one end of the arm 64 moves the workpiece W
At a position facing the positioning hole H formed at the bottom. The set of works W is placed on a jig G, respectively.

Further, by lowering the piston rod 26 under the driving action of the cylinder portion 12, the knuckle joint 70 is lowered linearly under the guide action of the first guide groove 68, and the arm 64 is moved to the second guide groove. It descends linearly along the linear part 84a of 84. As a result, the arm 64 descends linearly while maintaining a substantially horizontal state, whereby the reference pin 100 is pressed into the positioning hole H formed in the work W, and the work W is positioned at a predetermined position. (See FIG. 8). When a pair of grooves 98a and 98b formed in the arm 64 abut against the stopper pins 96a and 96b, respectively, the lowering of the arm 64 is regulated, and the arm 64 comes to the displacement end position.

Then, under the switching action of a switching valve (not shown), a pressure fluid is supplied to the other fluid pressure input / output port 20b, and the one fluid pressure input / output port 20a is opened to the atmosphere. Therefore, the piston 24 is under the action of the pressure fluid.
Rises, the knuckle joint 70, the rollers 82a, 8
2b and the arm 64 are displaced integrally with the piston rod 26. In this case, the knuckle joint 70 rises linearly under the guide action of the first guide groove 68 and the roller 82
As the arms a and 82b rise linearly under the guidance of the linear portion 84a of the second guide groove 84, the arm 64 rises by a predetermined distance while maintaining a substantially horizontal state.

When the rollers 82a and 82b are guided by the arc portion 84b which is continuous with the linear portion 84a of the second guide groove 84, the arm 64 is moved to the rod pin 74.
, And return to the initial position. In this case, the knuckle joint 70
Rises linearly along the first guide groove 68 and comes into contact with the ceiling portions of the first body 58 and the second body 60, whereby the displacement thereof is regulated.

In this embodiment, the knuckle joint 70 is linearly slid and displaced under the guide action of the first guide groove 68 formed in a straight line, so that the arm 64 is held in a substantially horizontal state. The arms 64 can be moved up and down linearly, and the rollers 82a and 82b are slid and displaced under the guide action of the arc portion 84b of the second guide groove 84 formed in an arc shape, thereby moving the arm 64 around the rod pin 74. It can be rotated by a predetermined angle. in this case,
The vertical movement of the arm 64 in a substantially horizontal state and the rotation movement about the rod pin 74 can be performed continuously.

As a result, in this embodiment, it is not necessary to use two cylinders as compared with the prior art, so that the entire apparatus can be downsized and the installation space can be effectively used.

Further, in the present embodiment, the raising and lowering operation and the turning operation of the arm 64 can be performed smoothly and continuously with a simple configuration, so that the number of parts is reduced and the manufacturing cost is reduced. Can be.

Further, in this embodiment, when the arm 64 held in a substantially horizontal state moves up and down linearly, it is guided by the knuckle joint 70 guided by the first guide groove 68 and the second guide groove 84. The rollers 82a and 82b are provided so as to be guided at the same time, thereby preventing the occurrence of play when the arm 64 moves up and down. When the arm 64 held in a substantially horizontal state moves up and down linearly, the knuckle joint 70 slides along the first guide groove 68 without sliding the rollers 82a and 82b in the second guide groove 84. The arm 64 may be moved up and down only by the movement.

Further, in the present embodiment, the description has been made based on the work of positioning the work W in which the reference pin 100 is press-fitted into the positioning hole H of the work W, but the present invention is not limited to this. Needless to say, the present invention can be used in various fields such as positioning of a jig, clamping of a work, and setting of a work that requires assembling accuracy.

When the work is clamped, the work can be clamped at an arbitrary position where the arm 64 held in a substantially horizontal state descends, so that it is possible to cope with a work having various thicknesses.

The cylinder device 1 according to the present embodiment
0 is applied to spot welding, the arm 64
Can be raised and lowered while maintaining a substantially horizontal state, so that there is an advantage that the interval between the spots to be spot-welded can be reduced.

In addition, the driving source for driving the arm operating section 16 is not limited to the cylinder section 12, but instead of the cylinder section 12, means for linearly reciprocating the knuckle joint 70, for example, An electric linear actuator (not shown) or the like may be used. In this case, by connecting one end of the ball screw shaft or the feed screw shaft provided on the electric linear actuator to the knuckle joint 70, it is needless to say that the same operation and effect as in the present embodiment can be obtained.

[0041]

According to the present invention, the following effects can be obtained.

That is, since it is not necessary to use two cylinders as compared with the prior art, the entire apparatus is downsized,
Effective use of the installation space can be achieved.

Further, since the raising and lowering operation and the turning operation of the arm can be performed smoothly and continuously with a simple configuration, the number of parts can be reduced and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state where a cover member is opened from a cylinder device according to an embodiment of the present invention.

FIG. 2 is a partially exploded perspective view of the cylinder device shown in FIG.

FIG. 3 is a vertical sectional view of a cylinder section taken along line III-III of FIG. 2;

FIG. 4 is a partially cutaway perspective view of the cylinder device shown in FIG. 1;

FIG. 5 is an operation explanatory diagram when an arm constituting the cylinder device of FIG. 1 is at an initial position.

FIG. 6 is an operation explanatory diagram when the arm has been rotated by a predetermined angle from the initial position shown in FIG. 5;

7 is an operation explanatory diagram when the arm further rotates from the state shown in FIG. 6;

FIG. 8 is an operation explanatory diagram when the arm is lowered from the state shown in FIG. 7 while maintaining a substantially horizontal state.

FIG. 9 is a transverse sectional view taken along line IX-IX of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Cylinder device 12 ... Cylinder part 14 ... Substrate 16 ... Arm operating part 18a, 18b ... Cylinder chamber 20a, 20b ... Fluid pressure inlet / outlet port 22 ... Cylinder tube 24 ... Piston 26 ... Piston rod 58, 60 ... Body 64 ... Arm 68 , 84 ... guide groove 70 ... knuckle joint 72a, 72b ... bifurcated part 74 ... rod pin 78 ... plane part 82a, 82b ... roller 84a ... linear part 84b ... arc part 86 ... escape groove 96a, 96b ... stopper pin

 ──────────────────────────────────────────────────の Continued on the front page F term (reference) 3C016 CA01 CC02 HA04 HB05 3C020 CC01 CC07 CC08 YY04 YY06

Claims (7)

[Claims] 1. A cylinder portion having a piston reciprocating along a cylinder chamber under the action of a pressure fluid supplied from a fluid pressure inlet / outlet port, and a piston rod connected to the piston and displaced integrally with the piston. And a body fixed to one end of the cylinder portion, and an arm provided on the body so as to be displaceable integrally with the piston rod via a connecting member connected to one end of the piston rod. A first guide means for guiding the body along the axial direction of the body while holding the arm in a state substantially perpendicular to the axis of the body; and a second guide for guiding the arm so as to be rotatable by a predetermined angle. A cylinder device provided with two guide means. 2. The apparatus according to claim 1, wherein said first guide means comprises a first linear guide groove for guiding the connecting member along an axial direction of the body, and said second guide means comprises an arm. A second guide groove having a circular arc shape for guiding a roller connected to the cylinder device. 3. The cylinder device according to claim 2, wherein the arm is pivotally mounted on a connecting member, and is provided so as to be rotatable by a predetermined angle around a rod pin that supports the arm. 4. The apparatus according to claim 2, wherein the body comprises a first body and a second body which are symmetrically divided into two, and the first body and the second body respectively include a first body and a second body. A cylinder device wherein a guide groove and a second guide groove are provided to be substantially symmetrically opposed to each other. 5. The device according to claim 4, wherein the second guide groove has a linear portion formed linearly along the axial direction of the body, and an arc portion formed in an arc shape continuous with the linear portion. And a cylinder device. 6. The cylinder device according to claim 1, wherein a stopper member for locking the arm is provided on the body. 7. The device according to claim 2, wherein a relief groove for a roller that slides along the second guide groove is formed in a portion adjacent to the second guide groove. Cylinder device.