JP3301243B2 - Tool holding device for driving machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastener holding device of a driving machine in which a magnet is provided on a nail guide, and the magnet sucks and holds a fastener such as a nail in the nail guide.

[0002]

2. Description of the Related Art As conventional examples, Japanese Patent Application No. 61-163002 and Japanese Patent Application No. 6-5286 filed earlier by the present applicant are shown in FIG. The driving operation of the driving machine will be described below with reference to FIG. First, the nail head 12b is inserted into the nail guide 10 provided to be vertically slidable, and the nail tip 12c is pressed against the wood 21 (not shown). Thus the nail tip 12
When c is pressed against the wood 21, the nail head 12b hits the nail sensing portion 9a of the push lever 9, and the force of the nail 12 pushing up the nail sensing portion 9a causes the spring 18 pressing the push lever 9 to the ejection port side. When it exceeds the pressing force,
The push lever 9 is pushed upward and the lock of the trigger 5 is released. Next, when the trigger 5 is pulled with the trigger 5 unlocked as described above, the compressed air accumulated in the upper portion of the head valve 2 passes through the air passage 4 and escapes from the trigger valve 3, so that the head valve 2 rises. Then, the compressed air suddenly flows into the cylinder 6, the piston 8 descends rapidly, and the driver blade 7, which is integrally connected with the piston 8, strikes the nail head 12b with the striking surface 17 to fix the nail 12. It is driven into wood 21 (not shown). Nail 1 left behind
When the trigger 5 is released with the head 2 remaining in the nail guide 10, the head valve 2 descends, and the piston 8 and the driver blade 7 are moved to the top dead center by compressed air accumulated around the cylinder 6 as shown in FIG. Return to. By repeating this operation several times, the nail 12
Is flushed into wood 21 (not shown).

[0003] In the fastener holding device of the driving machine shown in the figure, a magnet 11 is bonded to the tip of a nail guide 10 by an adhesive, and when a nail 12 is inserted into the nail guide 10, a nail shaft portion 12 a becomes a suction portion. 15 so that the driving machine body 1 and the nail 12 can be held with one hand.
It has a safe structure that makes it easy to aim at the driving point and does not need to support the nail 12 with the other hand. Further, since the nail guide 10 is formed of a high-manganese steel which is a non-magnetic material, the magnetic flux of the magnet 11 can be used effectively, and the non-magnetic material has a non-magnetic property by heat treatment or work hardening and has a Rockwell hardness of 20 to 50. Therefore, the nail guide 10 can be prevented from being deformed and worn even when the fastener moves while hitting and sliding within the nail guide 10 when the fastener is driven. Further, a nail 12 is provided in the nail guide 10.
There is a step 14 so that the nail 12 is held substantially parallel to the driving direction of the driving machine at the time of suction, and the step 14 is connected to the suction section 15 by a gentle slope 16.

[0004]

In the initial state of driving, the axis of the driver blade 7 and the axis of the nail 12 are eccentric. At the time of driving, the nail head 12b moves sharply while contacting the slope 16. A large impact force is applied to the nail guide 10 in a direction perpendicular to the axial direction. In the fastener holding device of the driving machine having the above-described structure, when a large impact force is applied to the nail guide 10 as described above, the magnet 11 provided on the nail guide 10 sinters the powder to magnetize the magnet. Therefore, the magnet 11 is fragile like ceramics and may be damaged. When the damaged magnet 11 is detached, the force for holding the nail 12 by suction is reduced. SUMMARY OF THE INVENTION It is an object of the present invention to provide a fastener holding device for a driving machine in which a magnet is hardly damaged while maintaining the original work efficiency, and even if the magnet is damaged, the force for holding and holding the fastener is not reduced. It is to provide.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to provide a magnet cover made of a material softer than the nail guide, which covers almost all the surface of the nail guide except for the surface of the magnet which holds the fastener. This is achieved by:

[0006]

In the fastener holding device of the driving machine configured as described above, even if the impact force generated at the time of the driving is absorbed by the magnet cover and the magnet is damaged, the magnet is held on the side for holding the fastener by suction. Since the surface except the surface is almost covered by the magnet cover, the damaged magnet does not come off the nail guide.

[0007]

1 to 3 show a fastener holding device of a driving machine according to the present invention. The driving operation of the driving machine and the configuration of the driving machine other than the fastener holding device are the same as those in the related art. As shown in the figure, a magnet 11 and a magnet cover 2 which cover almost the surface of the nail guide 10 except for the surface of the magnet 11 on the suction portion 15 side so that the nail 12 is sucked and held by the suction portion 15.
0 are connected by an adhesive. Further, as shown in FIG. 2, the nail 12 is inserted into the nail guide 10 to
There is a step 14 in the nail guide 10 such that the axis of the nail 12 is substantially parallel to the driving direction of the driving machine main body 1 when the a is adsorbed to the adsorbing section 15, and the step 14 is gradual. The slope 16 is connected to the suction unit 15. The magnet cover 20 fixes the magnet 11 via an adhesive and substantially covers the magnet 11 except for the surface on the suction portion 15 side. Although not shown, the surface of the magnet 11 on the side of the attraction portion 15 is slightly projected from the magnet cover 20. This is to prevent an air gap from being generated between the magnet 11 and the attracting portion 15 from lowering the attracting / holding force. Also magnet cover 2
Numeral 0 is made of aluminum which is softer than the nail guide 10 and the magnet 11. Further, the magnet cover 20 is provided with a hole 20a as shown in the figure, and when the magnet 11 is inserted, the internal air escapes from the hole 20a, so that the assembly can be easily performed.

In the fastener holding device of the driving machine as described above, the impact force generated at the time of driving can be absorbed by the magnet cover 20, so that the magnet 11 is hardly damaged, and even if it is damaged, the magnet 1
1 is a magnet cover 2 except for the surface on the suction unit 15 side.
Damaged magnet 1 because it is almost covered by 0
Since the nail 1 does not come off from the nail guide 10, it is possible to prevent a decrease in the force for holding the nail 12 by suction. FIG.
FIG. 4 is a view showing another embodiment of the present invention. As shown in the figure, the nail guide 10 and the magnet cover 20 are provided with a thread, and the bonding force is further increased by screw-fitting and using an adhesive together. Can be.

[0009]

According to the present invention, the surface of the magnet provided on the nail guide except for the surface on the side where the stopper is held by suction is substantially covered with the magnet cover in order to hold the stopper in the nail guide by suction. Accordingly, the present invention provides a fastener holding device for a driving machine in which the magnet is hardly damaged while maintaining the original work efficiency, and even if the magnet is damaged, the force for holding and holding the fastener of the magnet does not decrease. can do.

[Brief description of the drawings]

FIG. 1 is a cross-sectional side view showing an embodiment of a driving machine employing a fastener holding device of the present invention.

FIG. 2 is an enlarged view of a main part of FIG. 1 showing a state where a nail is held;

FIG. 3 is an enlarged view of a main part of FIG. 1 showing an initial state of driving.

FIG. 4 is a cross-sectional side view showing an example of a conventional driving machine.

FIG. 5 is a sectional side view showing another embodiment of the fastener holding device of the present invention.

[Explanation of symbols]

7 is a driver blade, 8 is a piston, 10 is a nail guide, 11 is a magnet, 12 is a nail, 12a is a nail shaft,
12b is a nail head, 12c is a nail tip, 14 is a step, 15 is a suction part, 16 is a slope, 20 is a magnet cover, 20a
Is a hole.

Claims (1)

(57) [Claims] 1. A piston driven by air pressure and reciprocated in a cylinder by opening and closing a trigger valve, a driver blade integrally connected to the piston, and a nail guide for guiding a stopper hit by the driver blade. In a driving machine having a magnet provided on a nail guide so as to suck and hold a fastener in a nail guide, a surface of the magnet except for a surface on which the fastener is sucked and held is almost covered, and is softer than the nail guide. A magnet cover made of a material is provided, and holes for venting air are formed in the magnet cover.
A fastener holding device for a driving machine, which is provided .