JPH06328182A - Blind rivet caulking machine - Google Patents

Abstract

PURPOSE:To provide a blind rivet caulking machine which precisely guides a blind rivet into a holding hole and holds it. CONSTITUTION:On a pair of chuck claws 16 freely openable and closable formed with a holding hole 16a to hold a blind rivet 7, a guide groove 16b of a shape that the blind rivet 7 can be passed is provided in smoothly extensible into the holding hole 16a. Further, a magnet 21 is buried in a mandrel groove 16c on the rear of the chuck claw 16 and surely guiding the blind rivet into the holding hole to hold it. Therefore, the blind rivet 7 is surely guided into the holding hole 16a of the chuck claw 16 along the guide groove 16c and the mandrel of the rivet 7 is surely held in the mandrel groove with the magnet, and the rivet can be prevented from dropping out inward the caulking machine or inclining.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supplies a blind rivet in a holding hole of a chuck claw in a smooth and accurate direction, and then accurately adjusts the blind rivet with an axial center until the blind rivet is inserted into a prepared hole of a workpiece. Blind rivet crimping machine that keeps on.

[0002]

2. Description of the Related Art Conventionally, when a work made of a plurality of thin plates is fixed, a work unit cannot be arranged on the back side of the work, and a caulking method using a blind rivet (hereinafter referred to as a rivet) as shown in FIG. Is used,
A hand-type blind rivet crimping machine (hereinafter referred to as "crimping machine") is used for the crimping work. Although various kinds of caulking machines have been developed, the caulking machine 1 shown in FIG. 5 is generally used. This caulking machine 1 has a cylindrical outer cylinder cap 6 to which a tip 8 having a guide hole 8a for guiding the mandrel 7a of the rivet 7 is attached at the tip, and this outer cylinder cap 6 is a cylinder mechanism. The outer cylinder piston rod 2a (not shown) is operated so that it can be moved forward and backward. Inside the outer cylinder cap 6, the inner cylinder piston rod 2 of the cylinder mechanism is provided.
Cylindrical jaw holder 9 that can be moved forward and backward by the operation of b
Is arranged so as to abut on the outer cylinder cap 6, and the tip of the jaw holder 9 is provided with a tapered storage hole 9a. And the storage hole 9a of this jaw holder 9
A pair of jaws 13 biased toward the forward side by a spring 11 are housed therein so as to be able to expand in the radial direction. When the jaw holder 9 is at the most forward position, the jaws 13 abut on the distal tip 8. It is configured to retract into the jaw holder 9 against the spring 11 and widen the gap between the jaws 13. A chuck unit 14 having a pair of openable and closable chuck claws 16 for holding the rivet 7 supplied by a swing pipe 19 is attached in front of the cylinder mechanism.
A mandrel receiver 22 for supporting the mandrel 7 a of the rivet 7 is attached to the outer circumference of the rivet 7. The mandrel receiver 22 has a rotatable mounting portion,
During the caulking work, when the mandrel 7a is inserted into the guide hole 8a of the tip 8 attached to the outer cylinder cap 6 which is advanced by the operation of the cylinder mechanism, the mandrel 7a is pushed out to the outside of the chuck unit 14 by the outer cylinder cap 6 almost at the same time. It is configured to

[0003]

In the caulking machine 1 described above,
The rivet 7 which is air-fed from the swing pipe 19 is introduced into the holding hole 16a provided in the chuck claw 16 at the tip of the chuck unit 14, and the mandrel 7a of the rivet 7 is held.
Is supported by a mandrel receiver 22 attached to the outer periphery of the chuck unit 14 and extending to the inside of the chuck unit 14. After that, the mandrel 7a of the rivet 7 is introduced into the guide hole 8a of the tip tip 8 which is advanced by the operation of the cylinder mechanism, and is held by the jaw 13 inside thereof, and is pushed out to the tip of the caulking machine 1 in that state for caulking work. Prepare However, in this caulking machine 1, when the rivet 7 air-fed by the swing pipe 19 is transferred from the inside of the swing pipe 19 to the holding hole 16a of the chuck claw 16, the swing pipe 19 is inclined with respect to the holding hole. Since the rivets 7 are attached while being inclined, the rivets 7 are supplied to the holding holes 16a while being inclined, and there is a problem that the caulking work cannot be performed thereafter. Also, the holding hole 16a
Even if the rivet 7 is correctly held on the rivet 7, if the mandrel 7a of the rivet 7 is changed in the axial direction of the caulking machine 1 before being introduced into the guide hole 8a of the tip 8, the rivet 7 is held in the holding hole 16a. The rivet 7, which has been used, comes out inside the caulking machine 1 or is inclined with respect to the axial center, and cannot be introduced into the guide hole 8a of the tip end 8.

[0004]

According to the present invention, in order to solve the above problems, a holding hole for holding a blind rivet is formed in a main body portion having a cylinder mechanism having a two-step stroke and a grip portion. A blind rivet in a blind rivet caulking machine in which a chuck unit having a chuck claw and a swing pipe whose tip is positioned near the chuck claw is connected to the pair of openable and closable chuck claws provided at the tip of the chuck unit. A blind rivet supplied to the chuck claw with a smooth curved guide groove through which the blind rivet can pass and a magnet attached to the rear part of the chuck claw so that the rivet can be smoothly and accurately introduced into the holding hole of the chuck claw. The mandrel is securely sucked and held by the chuck claw.

[0005]

In the blind rivet crimping machine having the above construction, the air-blended blind rivet is introduced into the holding hole at the tip of the chuck claw through the swing pipe, and the mandrel is inserted into the guide hole of the tip that is advanced by the cylinder mechanism. Be prepared to be guided. At this time, the rivet is supplied by the swing pipe inclining with respect to the caulking machine axis, but the chuck claw has a smooth guide groove through which the blind rivet can pass so as to extend from the surface on the tip side of the swing vipe to the holding hole. Since it is formed with a curved surface, the rivet supplied to the guide groove of the chuck claw gradually changes its direction along the guide groove in the direction of the caulking machine axis, and the rivet axis is completely swaged near the holding hole. Since it coincides with the axial direction, the mandrel of the rivet can be surely introduced into the guide hole of the tip that is advanced thereafter without being inclinedly introduced into the holding hole. Also, the rivet mandrel is securely held by the chuck claw by the magnet attached to the rear part of the chuck claw, and the held mandrel is introduced into the guide hole and separated from the chuck claw until the chuck claw is spread by the outer cylinder cap. There is nothing to do.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1 and FIG. 2, reference numeral 1 denotes a blind rivet caulking machine (hereinafter referred to as a caulking machine), and a main body portion 4 including a cylinder mechanism 2 having two piston rods and a grip portion 3 having a start switch 3a. have.
A cylindrical mandrel recovery bottle 5 equipped with an ejector mechanism (not shown) is attached to the rear portion of the main body portion 4, and a guide pipe 10 described later is connected thereto and cut after caulking work. The mandrel 7a is sucked and stored. The cylinder mechanism 2 of the main body portion 4 has a cylindrical outer cylinder piston rod 2a and a cylindrical inner cylinder piston rod 2b that passes through the inside of the outer cylinder piston rod 2a coaxially with the outer cylinder piston rod 2a. The inside of the cylinder mechanism 2 is the first cylinder chamber 2
c, the second cylinder chamber 2d, and the third cylinder chamber 2e. The first cylinder chamber 2c and the third cylinder chamber 2e use air, and the second cylinder chamber 2d uses hydraulic oil as the working fluid. The cylindrical piston rod 2a and the inner cylindrical piston rod 2b are configured to perform a two-step stroke motion. The outer diameter of the inner cylinder piston rod 2b is the same as the inner diameter of the outer cylinder piston rod 2a, and has a stepped shape with a larger diameter than that. When the cylinder mechanism operates, the inner cylinder has a predetermined length or more. The piston rod 2b is configured so as not to enter the outer cylinder piston rod 2a.

A tip portion of the outer cylinder piston rod 2a is located in a chuck unit 14 which will be described later, and a cylindrical outer cylinder cap 6 having a tapered tip is screwed into the chuck unit 14. A blind rivet 7 (hereinafter, referred to as a blind rivet 7 as shown in FIG.
It is called a rivet. The tip tip 8 having a guide hole 8a through which the mandrel 7a) is opened is attached, and the mandrel 7a of the rivet 7 can be introduced into the outer cylinder cap 6. Also, the inner cylinder piston rod 2b
A jaw holder 9 having a tapered storage hole 9a is abutted on the inner diameter of the outer cylinder cap 6 and slidably screwed into the tip of the storage hole 9a of the jaw holder 9.
In a, a plurality of jaws 13 each having an acute tooth portion on the opposing surface are housed so as to be movable in a direction away from the axis of the crimping machine 1 and along the tapered hole 9a of the jaw holder 9. A jaw pusher having a through hole through which a mandrel of a rivet can pass is arranged at the rear of this jaw so as to come into contact with the rear portion of the jaw, and can be moved forward and backward along the inner diameter of the inner cylinder piston rod 2b and the jaw holder. Is configured. Further, a guide pipe on the pipe through which the mandrel of the rivet extending to the mandrel collecting bottle can pass is installed in the inner cylinder piston rod, and the circular head of the guide pipe pushes the jaw pusher to push the jaw pusher. One end of a spring for constantly urging the jaw abutting on the pusher in the forward direction is supported.

On the other hand, in front of the main body 4, a chuck unit 14 having a hollow structure having a hole having substantially the same diameter as the outer diameter of the outer cylinder piston rod 2a is attached inside via a flange 15, and a cylinder mechanism is provided. The outer cylinder piston rod 2a extending from 2 and the outer cylinder cap 6 are guided. A pair of chuck claws 16 that can be opened and closed are arranged at the tip of the chuck unit 14 such that the tips are always closed by a spring. The sleeve of the rivet 7 is attached to the tip of the chuck claw 16 at the axial center. 7b for holding the mandrel 7a of the rivet 7 as shown in FIG.
A V-shaped mandrel groove 16c of 90 ° is formed so as to extend over a pair of claws of the chuck claw 16. further,
The chuck unit 14 is provided with a hose connecting portion 14a that projects in the lateral direction.
In a, a hose fitting 18 that connects a supply hose 17 extending from a rivet supply device (not shown) to one end and a semi-circular hole provided at the other end of the hose fitting 18 have one end abutting the hole. A swing pipe 19 which is rotatably supported along is attached. This swing pipe 1
9 is a part of which is located in the opening 14 b provided in the chuck unit 14 and the tip of which is always the chuck claw 1.
6 is biased by a spring 20 toward a guide groove described later. Moreover, a notch 19a through which the mandrel 7a can pass is provided at the tip of the swing pipe 19, and when the rivet 7 supplied through the swing pipe 19 is held by the chuck claws 16, the mandrel 7a is cut. Is protruded from the notch 19a into the chuck claw 16 and is held by the mandrel groove 16c.

The rear end surface 16d of the chuck claw 16 is machined at an angle that is perpendicular to the mounting angle of the swing pipe 19, and the tip of the swing pipe 19 and the chuck claw 1 are formed.
The intervals of 6 are configured to be even. A guide groove 16b through which the rivet 7 can pass is formed in the chuck claw 16 from the rear end surface 16d of the chuck claw 16 in the holding hole 16b.
It is formed in a curved tube shape with a smooth curved surface across a pair of claws of the chuck claw 16 so as to reach a. The guide groove 16b is formed on the side of the rear end surface 16d on the swing pipe 1 side.
It has an axis of inclination 9 and is formed so as to be smoothly connected to the holding hole 16a by the curved surface portion, and holds the rivet 7 sent through the swing pipe 19 in the holding hole 16a.
It is configured so that it can be accurately supplied. Further, on the rear part of the chuck claw 16, a pair of claws of the chuck claw 16 are arranged such that the axis thereof is oriented in a direction forming an angle of 45 ° with the longitudinal section of the caulking machine 1 and one end is located on the inclined surface of the V-shaped groove of the mandrel groove 16c. One columnar magnet 21 is embedded in each of the above, and the mandrel 7a of the rivet 7 is securely held in the mandrel groove 16c.

Next, the operation of the present invention will be described. In the blind rivet crimping machine 1, when the previous crimping work is completed, the outer cylinder piston rod 2a and the inner cylinder piston rod 2b.
When reaches the most retracted position, a rivet supply device (not shown) is driven. At the same time, the rivet supply device is actuated, and the rivet 7 is air-fed to the holding hole 16a of the chuck claw 16 through the supply hose 17 and the swing pipe 19 with the sleeve portion 7b forward and the mandrel 7a rearward. The mandrel 7a falls off from the notch 19a of the swing pipe 19 and is held in the mandrel groove 16c of the chuck claw 16. At this time, the rivet 7 supplied from the swing pipe 19 to the chuck claw 16 is accurately introduced into the holding hole 16a of the chuck claw 16 along the guide groove 16b formed in the chuck claw 16, so that the rivet 7 does not tilt. , The magnet 2 embedded in the chuck claw 16 on it
1, the mandrel 7a is sucked into the mandrel groove 16c, so that the mandrel 7a is securely held and is not separated from the mandrel receiver 21. After that, when a predetermined time elapses, air is supplied to the third cylinder chamber 2e of the cylinder mechanism 2, and the hydraulic oil in the second cylinder chamber 2d and the air in the first cylinder chamber 2c are discharged. Therefore, the outer cylinder piston rod 2a and the inner cylinder piston rod 2b advance, and the outer cylinder cap 6 and the tip 8 also advance integrally with them. With the forward movement of the outer cylinder cap 2a, the swing pipe 19 is pushed out to the outside of the chuck unit 14 and is supported by the mandrel groove of the chuck claw.
a is passed through the guide hole 8a of the tip 8, and the jaw holder 9
Will be introduced in. In this state, the outer cylinder piston rod 2a and the inner cylinder piston rod 2b further move forward, and at the most advanced position, the chuck claw 16 at the tip of the caulking machine 1 is expanded to push the rivet 7 forward of the tip 8. Rivets 7 at this time
Is held by being sucked to the rear of the caulking machine 1 because the edge ejector mechanism is operating.

After that, in a state where air is sent to the third cylinder chamber 2e of the cylinder mechanism 2, low pressure hydraulic pressure is applied to the second cylinder chamber 2d, and the inner cylinder piston rod 2b begins to retreat together with the jaw holder 9. Since the jaws 13 in the jaw holder 9 do not move backward due to the elastic force of the spring 11, the distance between the jaws 13 is gradually narrowed by the tapered hole of the jaw holder 9, and the jaws 13 are sucked by the ejector mechanism. Rivet 7 mandrel 7a
Hold in. At the same time, the operation of the ejector mechanism is stopped,
The rivet 7 is held by the jaw 13 holding the mandrel 7a. In this state, when the rivet 7 is inserted into the pilot hole of the work (not shown) and the start switch 3a is pushed, the air supply to the cylinder mechanism 2 is stopped and the high pressure oil pressure is applied to the second cylinder chamber 2d. The inner cylinder piston rod 2b is suddenly retracted. Therefore, the mandrel 7a held by the jaw 13 is cut, and the rivet 7 is crimped at the tip of the crimping machine 1.

After that, at the same time when the ejector mechanism is reactivated, air is supplied to the first cylinder chamber 2c of the cylinder mechanism, the hydraulic oil in the second cylinder chamber 2d and the air in the third cylinder chamber 2e are discharged. To be done. for that reason,
The outer cylinder piston rod 2a and the inner cylinder piston rod 2b retreat to the last retracted position, and accordingly, the jaw holder 9 and the outer cylinder cap 6 that are separated from each other come into contact with each other. At this time, the jaw 13 in the jaw holder 9 is moved to the outer cylinder cap 6
Is pressed by the tip 8 attached to the spring 1
Against the elastic force of No. 1, the jaw holders 9 move in the directions of separating from each other along the tapered holes 9a and separate from the cut mandrel 7a. Therefore, the cut mandrel 7a has the through hole 12a of the jaw pusher 12 and the guide pipe 1 which are in a vacuum state due to the operation of the ejector mechanism.
It is sucked into the mandrel recovery bottle 5 behind the caulking machine 1 through 0. Further, at this time, the chuck claw 16 that has been expanded by the outer cylinder cap 6 is closed, and the swing pipe 19 that is extruded to the outside of the chuck unit 14 is closed.
Since it has returned to the inside of the chuck unit 14, as described above, the new rivet 7 is air-fed to the holding hole 16a of the chuck claw 16 and can be prepared for the next caulking operation. In this embodiment, the magnet 21 embedded in the chuck claw 16 has a cylindrical shape. However, the shape of the magnet 21 may be a square bar shape, and the same effect can be obtained if the number of magnets is two or more. If the magnet 21 is a magnet having a property of attracting a metal, such as a permanent magnet or an electromagnet, the same effect can be obtained.

[0013]

As described above, according to the present invention, since the guide claws are provided in the chuck claws of the blind rivet crimping machine, the blind rivet supplied by the swing pipe inclined with respect to the axis of the crimping machine is held by the guide groove. As it approaches the hole, it changes direction to the axial center of the caulking machine, so it is accurately introduced into the holding hole of the chuck claw, and the magnet is embedded in the mandrel groove of the chuck claw to allow the blind rivet to guide the tip hole. Even if you change the axial direction of the crimping machine to any direction before it is introduced, the rivet will fall into the crimping machine or tilt because the mandrel of the rivet is securely held in the mandrel groove by the magnet. Is gone
It can be surely introduced into the guide hole of the tip that is advancing.

[Brief description of drawings]

FIG. 1 is an enlarged vertical sectional view of a main part of FIG.

FIG. 2 is a front vertical sectional view of a blind rivet crimping machine according to the present invention.

FIG. 3 is a front view of a blind rivet.

FIG. 4 is an enlarged cross-sectional view of a main part taken along the line AA of FIG.

FIG. 5 is a longitudinal sectional view of a main part of a conventional blind rivet crimping machine.

[Explanation of symbols]

 1 Blind rivet caulking machine 2 Cylinder mechanism 2a Outer cylinder piston rod 2b Inner cylinder piston rod 2c First cylinder chamber 2d Second cylinder chamber 2e Third cylinder chamber 3 Grip 3a Start switch 4 Body 5 Mandrel recovery bottle 6 Outer cylinder cap 7 blind rivet 7a mandrel 7b sleeve part 8 tip tip 8a guide hole 9 jaw holder 9a storage hole 10 guide pipe 11 spring 12 jaw pusher 12a through hole 13 jaw 14 chuck unit 14a hose connection portion 14b opening 15 flange 16 chuck claw 16a Hole 16b Guide groove 16C V-shaped groove 16d Rear end face 17 Supply hose 18 Hose fitting 19 Swing pipe 19a Cutout 20 Spring 21 Magnet 22 Mandrel receiver

Claims (2)

[Claims] 1. A pair of openable and closable chuck claws provided with a main body portion having a cylinder mechanism having a two-step stroke and a grip portion, and having a holding hole for holding a blind rivet formed in the main body portion, and its holding. A chuck unit having a swing pipe rotatable with its tip positioned near the hole is connected, and an outer cylinder cap is provided in which a part of an outer cylinder piston rod extending from the cylinder mechanism is located. A tip that guides the mandrel of the blind rivet is attached to the tip of the outer cylinder cap, and a direction away from the center of the outer cylinder cap via a jaw holder that can be moved forward and backward independently of the outer cylinder cap by the cylinder mechanism. In a blind rivet caulking machine that stores multiple jaws that can be moved to The guide grooves in India rivets can pass shape, continuously from the swing pipe holding hole of the chuck claws and the blind rivet setting tool machine, characterized in that provided as smoothly extends. 2. The blind rivet crimping machine according to claim 1, wherein one or more magnets are attached to the rear portion of the chuck claws.