JPH0741363B2 - Blind rivet crimping machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention accurately holds a mandrel of a blind rivet supplied in a holding hole formed in a chuck claw, and then holds the mandrel until the blind rivet is inserted into a pilot hole of a work. The present invention relates to a blind rivet crimping machine that keeps accurate centering.

[0002]

2. Description of the Related Art Conventionally, a blind rivet (hereinafter referred to as a rivet) as shown in FIG. 5 is used where a working unit cannot be arranged on the back side of a work when firmly fixing a work made of a plurality of thin plates. A caulking method is performed, and a hand type blind rivet caulking machine (hereinafter referred to as a caulking machine) is used for the caulking work. Various kinds of caulking machines have been developed,
The crimping machine 1 shown in FIG. 5 is general. This caulking machine 1
Has a cylindrical outer cylinder cap 6 to which a tip tip 8 having a guide hole 8a for guiding the mandrel 7a of the rivet 7 is attached at the tip thereof.
Outer cylinder piston rod 2a of cylinder mechanism (not shown)
It is arranged so that it can move forward and backward by the operation of. Inside the outer cylinder cap 6, a cylindrical jaw holder 9 which can be moved forward and backward by the operation of the inner cylinder piston rod 2b of the cylinder mechanism is arranged so as to contact the outer cylinder cap 6, and the jaw holder 9 is provided. Tapered storage hole 9a at the tip of
Is provided. A pair of jaws 13 biased to the forward side by a spring 11 are housed in the housing hole 9a of the jaw holder 9 such that the jaws 13 can be expanded in the radial direction. The jaws 13 are configured so as to come into contact with the tip 8 and retract into the jaw holder 9 against the springs 11 to widen the distance 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 to the front of the cylinder mechanism, and the rivet is attached to the outer periphery of the chuck unit 14. A mandrel receiver 21 for supporting the mandrel 7a of No. 7 is attached.
A mounting portion of the mandrel receiver 21 is rotatable, and a tip 8 attached to an outer cylinder cap 6 that is advanced by the operation of a cylinder mechanism during caulking work.
When the mandrel 7a is inserted into the guide hole 8a, the outer cylinder cap 6 pushes it out of the chuck unit 14 almost at the same time.

[0003]

In the blind rivet crimping machine 1 described above, the blind rivet 7 fed by air 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 to rivet. The mandrel 7 a of No. 7 is attached to the outer circumference of the chuck unit 14 and is supported by a mandrel receiver 21 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 the blind rivet crimping machine 1, when the blind rivet 7 air-fed by the swing pipe 19 is obliquely supplied to the holding hole 16a of the chuck claw 16, the mandrel 7a of the rivet 7 is displaced from the axial center. Therefore, there is a defect that the rivet 7 is clogged without being introduced into the guide hole 8a of the tip 8. In addition, the rivet 7 is accurately attached to the holding hole 16a of the chuck claw 16.
If the axial direction of the crimping machine 1 is changed in the state of being introduced into the rivet, the rivet 7 will fall out from the holding hole 16a of the chuck claw 16 toward the inside of the crimping machine, or the rivet 7 will be tilted, so that the tip 8 is guided There is a problem that it is not introduced into the hole 8a.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a blind rivet crimping machine in which a rivet feeding device feeds a holding hose formed in a pair of chuck claws through a feeding hose and a swing pipe. A magnet is attached to the mandrel receiver for supporting the mandrel of the blind rivet, and the rivet mandrel is attracted to the mandrel receiver by magnetic force, so that the rivet is securely held on the axis of the caulking machine. There is.

[0005]

In the blind rivet crimping machine having the above structure, the air-fed blind rivet is held in the holding hole formed in the chuck claw at the tip by the swing pipe, and the mandrel of the held blind rivet is held by the mandrel receiver. It At this time, since the magnet is attached to the mandrel receiver, the mandrel is securely held in the mandrel receiver by the attracting action of the magnet. The held mandrel does not separate from the mandrel receiver until the mandrel receiver is pushed by the outer cylinder cap that is advanced by the operation of the cylinder mechanism, and is reliably introduced into the guide hole of the tip.

[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 piston 2b has a predetermined length or more. The 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 in which a tapered storage hole 9a is formed is screwed into the tip end of the so as to come into contact with the inner diameter of the outer cylinder cap 6, and the storage hole 9a of the jaw holder 9 is accommodated.
In the inner cylinder piston rod 2b, the mandrel 7a of the rivet 7 is centered by the spring 11 supported by the circular head of the guide pipe 10 installed so as to extend to the mandrel recovery bottle 5 at the rear of the caulking machine 1. It has a through hole 12a through which it can pass, and through an inner cylinder piston rod 2b and a jaw pusher 12 that can advance and retreat along the inner diameter of the jaw holder 9, a sharp tooth portion is constantly urged in the advancing direction. A plurality of formed jaws 13 are housed therein and are configured to be movable in a direction away from the axial center of the crimping machine 1 and along the tapered hole 9a of the jaw holder 9.

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. Further, a pair of chuck claws 16 that can be opened and closed are arranged at the tip of the chuck unit 14, and the tip is always closed by a spring. The chuck claw 16 has a mandrel 7a at the axial center position.
A holding hole 16a for holding the sleeve portion 7b of the blind rivet 7 having the sleeve portion 7b and the sleeve portion 7b is formed. Further, the chuck unit 14 is provided with a hose connecting portion 14a that projects in the lateral direction, and a hose that connects a supply hose 17 extending from a rivet supplying device (not shown) to one end of the hose connecting portion 14a. The metal fitting 18 and a swing pipe 19 whose one end abuts on a hemispherical hole provided at the other end of the hose metal fitting 18 and is rotatably supported along the hole are attached. A part of the swing pipe 19 is the chuck unit 14
Is urged by a spring 20 so that it is located in the notch groove 14b provided in the and the tip is always located near the holding hole 16a of the chuck claw 16. Moreover, a split groove 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 claw 16, the mandrel 7a. Is projected into the chuck unit 14 from the split groove 19a and is held by a mandrel receiver 21 which will be described later.

The chuck unit 14 is provided with a mandrel receiver 21 rotatably supported about an attachment portion as a fulcrum, and an opening 1 provided over a pair of chuck claws 16.
It is biased by a spring 22 so as to always project into the inside of the chuck unit 14 from 6b, and is arranged so that its tip is located near the axial center of the chuck unit 14. A groove 21a having a Y-shaped cross section as shown in FIG. 4 is formed at a part of the tip of the mandrel receiver 21 so that the mandrel 7a of the rivet 7 can be properly held in the axial direction. ing. Further, the mandrel receiver 21 is formed with a flat surface portion extending in the same plane as the bottom surface portion of the groove 21a, and one end of the flat surface portion is exposed to the flat surface portion in a direction orthogonal to the axial center of the chuck unit 14. A cylindrical magnet 23 is embedded so as to extend so as to securely hold the mandrel 7a of the rivet 7 in the groove of the mandrel receiver 21.

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 passes through the supply hose 17 in a posture in which the sleeve portion is in the front and the mandrel is in the rear, and the chuck claw 16 is provided.
The air is fed to the holding hole 16a of the swing pipe 19, the mandrel drops out from the split groove 19a of the swing pipe 19, and is held by the mandrel receiver 21. At this time, since the mandrel 7a is attracted to the mandrel receiver 21 by the magnet 23 embedded in the mandrel receiver 21, 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. As the outer cylinder cap 2a moves forward, the swing pipe 19 and the mandrel receiver 21 are pushed out of the chuck unit 14, and the mandrel receiver 2
The mandrel 7a supported by 1 is introduced into the jaw holder 9 through the guide hole 8a of the tip 8. 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. At this time, the rivet 7 is sucked and held behind the caulking machine 1 because the 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 are sucked by the ejector mechanism. 7 rivet 7 mandrel 7
Hold a. At the same time, the operation of the ejector mechanism is stopped, and 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.
Also, since the mandrel receiver 21 is 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 example,
Although the magnet 23 embedded in the mandrel receiver 21 has a cylindrical shape, the magnet may have a rectangular bar shape, and the same effect can be obtained if the number of magnets is two or more. Further, if the magnet 23 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, the blind rivet supplied by the swing pipe is introduced into the holding hole of the chuck claw with an inclination because the magnet is embedded in the mandrel receiver of the blind rivet caulking machine. Even if the mandrel of the rivet can be attracted to the predetermined groove of the mandrel receiver by magnetic force, it can be held on the axis of the crimping machine and the axial direction of the crimping machine can be moved in any direction when the blind rivet is supplied. Even if it is changed, the rivet mandrel is securely held by the magnet, so the rivet will not fall out of the holding hole of the chuck claw, and the rivet mandrel can be securely inserted into the guide hole of the tip that is advancing. it can.

[Brief description of drawings]

FIG. 1 is an enlarged 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 4a Mandrel Storage 5 Mandrel Collection 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 part 14b Notch groove 15 Flange 16 Chuck claw 16a Holding hole 16b Opening 17 Supply hose 18 Hose metal fitting 19 Swing pipe 19a Split groove 20 Spring 21 Mandrel receiver 21a Groove 22 Spring 23 Magnet

Claims (1)

[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 whose tip is located near the hole and which is rotatable, and a mandrel receiver which holds the mandrel of the blind rivet but is detachable from the shaft center of the machine is connected to the inside of the chuck unit. An outer cylinder cap is provided in which a part of the outer cylinder piston rod extending from the cylinder mechanism is located, and a tip tip that guides the mandrel of the blind rivet is attached to the tip of this outer cylinder cap, while the cylinder mechanism is installed inside the outer cylinder cap. Away from the center via a jaw holder that can move forward and backward independently of the outer cylinder cap A blind rivet caulking machine that houses a plurality of jaws that can move in one direction, characterized in that one or more magnets are attached to a mandrel receiver that supports the mandrel of the blind rivet held in the holding hole of the chuck claw. Crimping machine.