JP2951298B2 - Retaining mechanism for bar with head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headed bar holding mechanism for holding a headed bar such as a blind rivet or a screw on a moving path of a working tool.

[0002]

2. Description of the Related Art Conventionally, as a mechanism for holding a rod with a head,
What is generally used in a blind rivet caulking machine or an automatic screw tightening machine is generally used. This type of headed bar holding mechanism generally has a main body that can guide a working tool such as a blind rivet caulking unit or a screwdriver bit, and has a pair of holding claws on the main body. It is configured to be rotatably mounted. The holding claw is urged to be always closed, and a holding hole capable of holding a headed bar on the moving path of the work tool is formed on the opposing surface thereof. The headed bar is adapted to be fed by air from a supply device, and a guide pipe is arranged in the main body so that the headed bar thus fed can be guided to the holding claws. You.

[0003]

However, in the above-mentioned conventional headed bar holding mechanism, when the headed bar is held by the holding claws, the air in the holding mechanism is pressed by the air that has fed the headed bar. The pressure rises, which causes the holding claws to be pushed open, causing problems such as the headed bar sticking out of the predetermined position and being held in an unstable position. As a countermeasure to prevent this, there is a structure in which a spring for urging the holding claw is strengthened so that the holding claw is not easily expanded. Problems such as an increase in frictional resistance with the tool and early wear of the holding claw and the working tool have occurred.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a headed bar holding mechanism capable of properly holding a headed bar fed by air at a predetermined position. The purpose is to provide. In order to achieve this object, the present invention provides a main body for guiding a work tool movable by being driven by a reciprocating drive source.
The holding claw is connected rotatably, and the holding claw is
The headed rod-shaped member fed by a
Form a holding hole that can be held on the moving path, and
On the head of the rod with head supplied to the predetermined position of the holding hole
Open at the position where the air flowing along the surface
An exhaust hole communicating with the portion is formed.

[0005] According to the configuration of the present invention described above, a bar with a head
The air that has supplied the air
Exhaust holes along the top surface of the headed bar by reaching
And discharged to the outside. Therefore, a bar with a head
Prevents the holding claw from expanding while holding it in place
can do. In addition, the exhaust hole was held in the holding hole.
The head with the head is formed diagonally according to the inclination of the top of the head.
If this is the case, the air exhaust efficiency is further improved.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4, reference numeral 1 denotes a blind rivet caulking machine used for caulking a blind rivet 30 which is an example of a bar with a head. The caulking machine main body 2 is integrally formed, and a headed bar holding mechanism 10 (hereinafter simply referred to as a holding mechanism 10) for temporarily holding the blind rivet 30 at the tip of the caulking machine main body 2. I have.

The caulking machine main body 2 has therein a cylinder mechanism 3 which is an example of a reciprocating drive source. The cylinder mechanism 3 includes a working tool 4 capable of holding a mandrel 31 of a blind rivet 30. Are connected. The work tool 4 is arranged to extend into a guide path 11a formed in the main body 11 of the holding mechanism 10, and is configured to move along the guide path 11a in response to the operation of the cylinder mechanism 3. Have been.

The holding mechanism 10 has a pair of holding claws 12, 12 rotatably connected to the main body 11, and the holding claws 12, 12 are always closed by springs 13, 13. , The moving path of the working tool 4 is closed. The holding claws 12,
A holding hole 12a is formed on the opposing surface of the working tool 4 on the moving path of the working tool 4 in a divided manner.
A guide pipe 14 of a blind rivet is connected to the main body 11 so as to communicate with 2a. The guide pipe 14 is rotatably connected to the main body 11, and is normally urged by a spring 15 to a position communicating with the holding hole 12a. A hose connector 16 is fixed to the main body 11 so as to communicate with the guide pipe 14. A supply hose (not shown) extending from the blind rivet supply device (not shown) to the hose connector 16. (Not shown) are connected to supply a blind rivet. In addition, the blind rivet is pressure-fed by air from a supply device through a supply hose.

Exhaust holes 17, 17 communicating from outside with the holding holes 12a are formed through the holding claws 12, 12, respectively. When the blind rivet is held in the holding hole 12a, the exhaust holes 17, 17 are opened at positions communicating with the upper surface of the head, and are formed obliquely in accordance with the inclination of the upper surface of the head of the blind rivet. , The exhaust efficiency of the air for supplying blind rivets is increased.

In the blind rivet caulking machine 1, the blind rivet 30 fed by air from a supply device (not shown) is engaged and held in the holding holes 12 a of the holding claws 12, 12 through the guide pipe 14. At this time, the air that has fed the blind rivet 30 is
When the blind rivet 30 reaches a predetermined position in the holding hole 12a, the blind rivet 30 is discharged to the outside through the exhaust hole 17, so that an increase in pressure in the holding mechanism 10 is suppressed, and the holding claws 12, 1
2 can be prevented from being pushed open. Therefore, the blind rivet can be held in the holding hole 12a without strengthening the springs 13, 13 for urging the holding claws 12, 12 in order to prevent the holding claws 12, 12 from being opened by air pressure.
At a predetermined position. Further, since the air flows along the upper surface of the head of the blind rivet reaching the predetermined position of the holding hole 12a, and flows into the exhaust hole 17 and is exhausted, the air pressure acts on the blind rivet simultaneously with the exhaust to perform the predetermined operation. Can be reliably held at the position. Therefore, for example, even when the blind rivet caulking machine 1 is used so that the tip faces upward, the blind rivet can be correctly held at a predetermined position of the holding hole 12a.

Thereafter, the blind rivet is clamped by the work tool 4 which advances in response to the operation of the cylinder mechanism 3, and is pushed out to the front of the holding claws 12, 12 while being swaged into the prepared hole of the work. When the blind rivet is pushed out from the holding claws 12, 12, the holding claws 12, 12 are pushed open by the working tool 4, but the force of the springs 13, 13 for urging the holding claws 12, 12 is unnecessarily increased. Since it is not necessary to reinforce, it is possible to suppress abrasion due to both frictional contacts.

In the embodiment of the present invention, a mechanism for holding a bar with a head in a blind rivet caulking machine has been described. However, the present invention is not limited to this.
The holding mechanism of the headed bar according to the present invention is, for example, an automatic screw tightening machine having a driver bit that can be rotated by a motor as a working tool and that can be engaged with a screw head, or as a working tool. The present invention is applicable to various mechanical devices that handle a bar with a head, such as a rivet caulking machine having a stem that can be fitted to a rivet head. Also, the position where the exhaust hole is provided can be arbitrarily changed without departing from the gist of the present invention.

[0013]

As described above , according to the headed rod holding mechanism of the present invention, the flow along the upper surface of the head of the headed rod is achieved.
The exhaust hole is provided at the position where the
Hold the bar with head in place in the hole
Air is discharged from the holding hole and the holding claw is
Spreading can be prevented. Therefore, always use a bar with a head.
Can be properly held at a predetermined position of the holding hole. Ma
The holding hole is oblique to the top of the head
Air is efficiently exhausted from inside the holding hole.
Can be issued.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view of a holding mechanism of a rod with a head according to the present invention.

FIG. 2 is a front view of a blind rivet caulking machine using the headed bar holding mechanism according to the present invention.

FIG. 3 is a front view of a headed rod holding mechanism according to the present invention.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Blind rivet caulking machine 3 Cylinder mechanism 4 Work tool 10 Retaining mechanism of bar with head 11 Main part 12 Retaining claw 12a Retaining hole 17 Exhaust hole

Claims (2)

(57) [Claims] 1. A main body for guiding a work tool movable by receiving a driving force of a reciprocating drive source is provided.
Rotatably connected to the holding claw to supply air from the supply device.
Movement of the working tool by moving the rod-shaped member with head
Form a holding hole that can be held on the road and
On the top of the head of the rod with head provided at the predetermined position of the hole
Communicates with the outside where the air flowing along flows in
A holding mechanism for a rod with a head, wherein an exhaust hole is formed . 2. An exhaust hole is a rod with a head held in a holding hole.
That it is formed diagonally according to the inclination of the top of the head
The holding mechanism for a bar with a head according to claim 1, wherein: