JP2616858B2 - Blind rivet caulking machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention supplies a blind rivet into a holding hole formed by a chuck claw,
The present invention relates to a blind rivet caulking machine which pushes out this blind rivet until a flange portion protrudes from the tip of a chuck claw, and then pushes the blind rivet into a prepared hole of a work.

[0002]

2. Description of the Related Art Conventionally, when a work consisting of a plurality of thin plates is firmly fixed, a hand-type blind for performing a caulking operation by a blind rivet (hereinafter referred to as a rivet) where a work unit cannot be located on the back surface of the thin plate. A rivet caulking machine (hereinafter referred to as a caulking machine) is used. Although various types of caulking machines of this type have been developed, a caulking machine shown in FIG. 5 is generally used. The caulking machine 1 has a cylindrical nose 13 having a mandrel guide 6c into which the mandrel 9a of the rivet 9 is inserted at the tip. A cylinder mechanism (not shown) is provided in the nose 13.
A jaw sleeve 15 is provided which can be moved forward and backward by the operation of. The jaw sleeve 15 has a tapered storage hole 15b at the tip thereof. A pair of jaws 14 urged forward by a spring 18 are accommodated in the accommodating hole 15b of the jaw sleeve 15 so as to be releasable in the radial direction. When the jaw sleeve 15 is at the most advanced position, 14 is configured to abut against the mandrel guide 6c and retreat into the jaw sleeve 15 against the spring 18 so that the gap between the jaws 14 is widened. A chuck unit 25 having a pair of chuck claws 11 for holding the rivet 9 supplied through a supply hose 24 is provided on the nose 13 so that the chuck unit 25 can advance and retreat in parallel with the nose 13 by the operation of a cylinder 27, and the distal end side has a nose. 13
The rivet 9 held by the chuck pawl 11 is moved by the mandrel as the chuck unit 25 moves forward and its tip is separated from the nose 13. It is configured to be located in front of the guide 6.

[0003]

In this caulking machine, the rivet 9 held by the mandrel guide 6c at the tip of the nose 13 is inserted into a prepared hole of a work (not shown), and then the cylinder mechanism in the nose 13 is inserted. When the jaw sleeve 15 is retracted by operating the jaw 14, the jaw 14
Depart from c. As a result, the jaw 14 is pressed by the elastic force of the spring 18 into the storage hole 15b of the jaw sleeve 15, whereby the jaw 14 moves to the center side and clamps the mandrel 9a of the rivet 9. Further, when the jaw sleeve 15 retreats, the mandrel 9 of the rivet 9 is moved.
a is pulled, the rivet 9 is caulked at its tip, and the mandrel 9a is reliably cut. However, in this caulking machine 1, the chuck unit 25 must be advanced along the nose 13, the rivet 9 held by the chuck pawl 11 must be supplied to the front of the nose 13, and inserted into the guide hole of the mandrel guide 6c. However, it takes a long time to supply 9 and the apparatus is not suitable for continuous operation.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks. A chuck claw for holding a rivet is arranged to be openable and closable in front of a mandrel guide, and when the rivet is supplied to the chuck claw, the rivet is chucked. An object of the present invention is to provide a blind rivet caulking machine configured to be pushed out to the tip of a claw to prepare for a caulking operation.

[0005]

A main body is provided with a first cylinder mechanism having a piston rod and a gripper, and the main body has an opening and closing formed with a holding hole for holding a desired blind rivet. A nose having a pair of free chuck claws and a supply pipe rotatable with its tip positioned near the holding hole is connected. The nose is provided with a second cylinder mechanism having a piston sleeve on which a part of the piston rod is located, and a mandrel guide for guiding a mandrel of a blind rivet is attached to a tip of the piston sleeve.

On the other hand, within the piston sleeve of the second cylinder mechanism, there is disposed a jaw sleeve which is moved forward and backward integrally with the piston rod of the first cylinder mechanism with a slight delay. Is provided with a tapered storage hole. A plurality of jaws movable in a direction away from the center through a jaw holder having a tapered hole on the retreat side are provided in the storage hole of the jaw sleeve, and a collet portion is provided at the tip on the retreat side in the jaw sleeve. The collet chuck is housed by being urged toward the piston rod.

[0007]

In the above-described blind rivet caulking machine, when the previous caulking operation is completed, the blind rivet is air-fed to the chuck claws, and the mandrel is guided and held by the mandrel guide. In this state, the piston rod of the first cylinder mechanism advances, the collet chuck advances with respect to the jaw sleeve, closes the collet portion at the tip thereof, and the piston sleeve moves slightly after the piston rod advances. The blind rivet stops at a position where the blind rivet is pushed out of the chuck pawl and is held at that position by suction or the like.

In this state, when the leading end of the rivet is inserted into the prepared hole of the work and the piston rod of the first cylinder mechanism in the nose is retracted, only the collet chuck is retracted integrally by the spring, and the collet portion is moved to the jaw holder. Break away from Thereafter, as the jaw sleeve also begins to retreat and moves away from the mandrel guide, the jaw projects together with the jaw holder from the jaw sleeve. for that reason,
The jaws move toward the center to narrow the gap and bite the rivet mandrel. Further, when the piston rod retreats together with the jaw sleeve and the jaw retreats and returns to the original position while holding the mandrel, the tip of the sleeve portion of the rivet is securely caulked and the mandrel is cut.

Thereafter, the piston sleeve of the second cylinder mechanism is moved back, and the mandrel guide pushes the jaw together with the jaw holder into the jaw sleeve, moves the jaw away from the center, separates the jaw from the mandrel, and is cut. Discharge the mandrel to the outside by air suction, etc., immediately feed the blind rivet to the chuck pawl as described above, hold this blind rivet at the position pushed out from the chuck pawl, and prepare for the next work Can be.

[0010]

Embodiments will be described below with reference to the drawings. 1 to 3, reference numeral 1 denotes a blind rivet caulking machine (hereinafter, referred to as a caulking machine), and a piston rod 2
The main body 4 includes a first cylinder mechanism 2 having an a. and a grip portion 3 having a start switch 3a of an air hydraulic control circuit (not shown) described later. The piston rod 2a of the first cylinder mechanism 2 is configured to be driven by a spring pressure of a spring 5 disposed at the back thereof when moving forward, and to be hydraulically driven only when the piston rod 2a is retracted.
A part of the piston rod 2a protrudes into a second cylinder mechanism 6, which will be described later, and one end of the piston rod 2a is connected to a connecting shaft 7 having a swelling portion at a distal end via a connecting member 8. A through hole 10 through which a mandrel 9a to be described later can pass is provided over the connecting shaft 7 and a collet chuck 17 to be described later. Further, a mandrel accommodating portion 4a connected to an air suction mechanism (not shown) is attached to a rear portion of the main body 4, and the cut mandrel 9a is actuated by the mandrel 9a in the mandrel accommodating portion 4a. Thus, it is configured to be sucked and stored through the inside of the through hole 10 and the inside of the guide sleeve 2b which moves integrally with the piston rod 2a.

A nose 13 having a pair of openable and closable chuck claws 11 having a holding hole 11a for holding a blind rivet 9 (hereinafter referred to as a rivet) having a mandrel 9a and a sleeve portion 9b is formed in the main body portion 4. The nose 13 is connected to the piston rod 2.
A second cylinder mechanism 6 having a piston sleeve 6a extending concentrically with a is provided. The piston sleeve 6a of the second cylinder mechanism 6 has a guide groove 6b in a direction in which the piston sleeve 6a extends. A pin 13a fixed to the nose 13 is located in the guide groove 6b so that the piston sleeve 6a does not rotate. Have been. A mandrel guide 6c for guiding the mandrel 9a of the rivet 9 is attached to the tip of the piston sleeve 6a, and is configured to come into contact with a jaw 14 described later when the piston sleeve 6a is retracted. Further, the piston sleeve 6a
A jaw sleeve 15 is slidably disposed inside the jaw sleeve 15. The jaw sleeve 15 is locked to the enlarged diameter portion of the connecting shaft 7 and is connected to the connecting shaft 7 via a slightly movable joint fitting 15a. The piston rod 2a is configured to integrally move forward and backward with a slight delay from the forward and backward movement of the piston rod 2a. Further, the jaw sleeve 15 has a tapered storage hole 15b on the distal end side, and a jaw holder 16 having a tapered hole 16a on the retreat side is stored in the storage hole 15b. The jaw holder 16 is provided with a storage groove 16b extending from the center thereof in the radial direction. The storage groove 16b houses a plurality of jaws 14 having sharp teeth on opposite surfaces. It is configured to be movable in a direction away from the camera. Further, the jaw sleeve 15 houses a collet chuck having a collet portion 17a at the tip.
Is a connecting shaft 7 integrated with the piston rod 2a by a spring 18.
It is urged to abut. Between the jaw sleeve 15 and the collet chuck 17, a collet 1
A spacer 19 is arranged so as to include the 7a and the spring 18, and is configured to protect the collet portion 17a.

On the other hand, the nose 13 is provided with a hose connecting portion 13b projecting in the lateral direction. The hose connecting portion 13b has a hose fitting 13c and a supply pipe 12 rotatably arranged at one end thereof. Are connected. A part of the supply pipe 12 is located in a notch groove 13 d provided in the nose 13 and the tip thereof is
Is biased by the linear spring 20 so as to be located near the holding hole 11a. Moreover, a split groove 12 a through which the mandrel 9 a can pass is provided at the center of the nose 13 at the tip end of the supply pipe 12, and the rivet 9 supplied through the supply pipe 12 is held by the chuck pawl 11. Then, the mandrel 9a falls out of the split groove 12a and is held by a mandrel receiver 21 described later. Further, a mandrel receiver 21 is disposed on the nose 13 via a leaf spring 22 so as to protrude into the nose 13 from an opening 11b provided across the pair of chuck claws 11, and a tip of the nose 13 is connected to the nose 13. The rivet 9 can be held horizontally by being positioned near the center of the rivet 9.

The pneumatic control circuit of the first cylinder mechanism 2 and the second cylinder mechanism 6 discharges oil in the cylinder chamber from the first supply / drain port 2c of the first cylinder mechanism 2 when the rivet 9 is supplied with air. Then, after a while, the second supply / discharge port 6d of the second cylinder mechanism 6 is opened to discharge air from the third supply / discharge port 6e, and to perform air suction by the air suction mechanism. The pneumatic control circuit supplies oil from the first supply / discharge port 2c by a one-shot signal output when the start switch 3a is pressed to return the piston rod 2a to the original position. Thereafter, air is supplied from the third supply / discharge port 6e and discharged from the second supply / discharge port 6d.

In the above-described caulking machine, when the mandrel of the rivet is cut off by the previous caulking operation and the discharge of the rivet is completed, the rivet 9 passes through the supply pipe 12 and the holding hole 1
Air is fed to the supply pipe 1a, the mandrel 9a falls out of the split groove 12a of the supply pipe 12, and is held by the mandrel receiver 21. Subsequently, the oil in the cylinder chamber of the first cylinder mechanism 2 is discharged, and the piston rod 2a moves forward by the spring pressure of the spring 5. Therefore, the piston rod 2a moves forward with respect to the piston sleeve 6a, and the connecting shaft 7 integral therewith advances the collet chuck 17 with respect to the jaw holder 16, and the collet portion 17 of the collet chuck 17
a comes into contact with the hole 16a on the retreat side of the jaw holder 16 and closes. In this state, the piston rod 2a further advances, the piston sleeve 6a of the second cylinder mechanism 6 advances integrally, the tip of the piston sleeve 6a abuts on the supply pipe 12 and the mandrel receiver 21, and moves these from the movement path. Let go. Thereafter, the piston rod 2a moves a predetermined stroke, and the mandrel 9a of the rivet 9 passes through the mandrel guide 6c at the tip of the piston sleeve 6a and hits the collet chuck 17, and as shown in FIG. 9 is pushed out from the chuck pawl 11 and its flange is
Stop at the position located at the front end of 1. At this time, one end of the rivet mandrel is sucked by the tip of the collet chuck 17 and the rivet is held.

In this state, when the tip of the rivet 9 pushed out to the tip of the chuck pawl 11 is inserted into the prepared hole of the work 23 and the start switch 3a of the gripper 3 is pressed, the piston rod 2a of the first cylinder mechanism 2 is pushed. Is retracted by hydraulic pressure. Accordingly, only the collet chuck 17 is retracted by the spring 18, and the collet portion 17a is separated from the jaw holder 16 and opened so that the mandrel 9a can pass through the hole therein. Further, the piston rod 2a
Is retracted and the enlarged diameter portion of the connecting shaft 7 comes into contact with the joint fitting 15a, the jaw sleeve 15 also starts to retract integrally,
The jaw 14 moves away from the mandrel guide 6c. Therefore, the jaw 14 projects from the jaw sleeve 15 together with the jaw holder 16, and the jaw 14
Of the rivet 9 is pushed by the inner wall of the storage hole 15b to move toward the center side, thereby narrowing the gap and biting the mandrel 9a of the rivet 9.
At this time, the saw-shaped teeth provided on the opposing surfaces of the jaws 14 can bite the mandrel 9a firmly.
When the piston rod 2a further retreats and returns to the original position while the jaw 14 clamps the mandrel 9a, the tip of the sleeve portion 9b of the rivet 9 is securely caulked as shown in FIG. Be cut off.

Thereafter, when the piston rod 2a returns to the home position, the piston sleeve 6a of the second cylinder mechanism 6 moves back as shown in FIG. 4c, and reaches the home position.
At this time, the mandrel guide 6c at the tip of the piston sleeve 6a hits the tip of the jaw 14 and pushes the jaw 14 together with the jaw holder 16 into the jaw sleeve 15. Therefore, the jaw 14 is guided by the jaw holder 16 and moves in a direction away from each other, and separates from the mandrel 9a. At this time, the air suction mechanism connected to the mandrel storage section 4a is operated, and the mandrel 9 cut through the through hole provided over the guide sleeve 2b, the piston rod 2a, the connecting shaft 7 and the collet chuck 17 is operated.
a is sucked and discharged to the mandrel storage section 4a. Thereafter, as described above, the rivet is immediately air-fed, and the rivet can be held at a position protruding from the chuck pawl to prepare for the next operation.

[0017]

As described above, according to the present invention, the chuck pawl holding the rivet is arranged to be openable and closable in front of the mandrel guide, and when the rivet is supplied to the chuck pawl, the rivet is attached to the tip of the chuck pawl. Because it is configured to push out and prepare for caulking work, the mandrel of the rivet can be clamped and pulled in by a series of forward and backward movements of the cylinder mechanism, and the mandrel can be cut while caulking the sleeve part of the rivet, A rivet can be supplied in a short time, and a blind rivet caulking machine with good workability can be provided.

[Brief description of the drawings]

FIG. 1 is an enlarged vertical sectional view of FIG.

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

FIG. 3 is an enlarged sectional view of a main part taken along line AA of FIG. 2;

FIG. 4a is an explanatory view of a main part showing a state before a caulking operation according to the present invention.

FIG. 4b is an explanatory view of a main part showing a caulking operation according to the present invention.

FIG. 4c is an explanatory view of a main part showing a state when the caulking operation of the present invention is completed.

FIG. 5 is a vertical sectional view of a main part of a conventional blind rivet caulking machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Blind rivet caulking machine 2 1st cylinder mechanism 2a Piston rod 2b Guide sleeve 2c 1st supply / discharge port 3 Gripping section 3a Start switch 4 Main body section 4a Mandrel storage section 5 Spring 6 2nd cylinder mechanism 6a Piston sleeve 6b Guide groove 6c Mandrel Guide 6d Second supply / discharge port 6e Third supply / discharge port 7 Connecting shaft 8 Connecting tool 9 Rivet 9a Mandrel 9b Sleeve portion 10 Through hole 11 Chuck claw 11a Holding hole 11b Opening 12 Supply pipe 12a Split groove 13 Nose 13a Pin 13b Hose Connection part 13c Hose joint 13d Notch groove 14 Jaw 15 Jaw sleeve 15a Joint fitting 15b Storage hole 16 Jaw holder 16a Hole 16b Storage groove 17 Collet chuck 17a Collet part 18 Spring 19 Spacer 20 Linear shape 21 mandrel receiving 22 the leaf spring 23 work 24 supply hose 25 chuck unit 26 spring 27 cylinder

Claims (2)

(57) [Claims] 1. A main body having a first cylinder mechanism having a piston rod and a gripping part, and a pair of freely openable and closable chuck claws having a holding hole for holding a desired blind rivet in the main body. A second cylinder mechanism having a piston sleeve in which a part of the piston rod is provided is connected to a nose having a rotatable supply pipe having a tip positioned near the holding hole, and the piston sleeve is connected to the nose. A mandrel guide for guiding the blind rivet mandrel is attached to the tip of the cylinder sleeve, and a jaw sleeve that moves forward and backward integrally with the piston rod of the first cylinder mechanism with a slight delay is arranged in the piston sleeve of the second cylinder mechanism. A tapered storage hole is provided on the tip side of the jaw sleeve, and a tapered hole is formed in the storage hole of the jaw sleeve. A plurality of jaws movable in a direction away from the center thereof are accommodated through a jaw holder held on the retreat side, and a collet chuck having a collet portion at the tip on the retreat side in the jaw sleeve is biased toward the piston rod. A blind rivet caulking machine characterized by storage. 2. A blind rivet caulking machine according to claim 1, wherein teeth are formed on opposing inner surfaces of the jaws.