JPH09168977A - Contact arm mechanism in nailing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a trace of a contact arm from being attached on a material to be nailed as well as to press the contact arm to the material to be nailed with a small pressure. SOLUTION: In a nailing machine for supplying nails charged in a magazine 4 to a nose part 3, pressing the tip of a contact arm 6 slidably provided along the nose part 3 to a material to be nailed 7, and driving nails 5 supplied into the nose part 3, a receiving surface 10 for receiving the front surface of a first nail supplied in the nose part 3 is formed in a part facing the tip opening part of the magazine 4 across the nose 3, and an opening part 8 for avoiding the receiving part 10 is formed on the contact arm 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact arm mechanism of a nailing machine improved so that a contact arm does not come into contact with a leading nail supplied from a magazine to a nose portion.

[0002]

2. Description of the Related Art A nailing machine is provided with a contact arm which is slidable along a nose portion and which is pushed toward the body by pressing the tip of the nailing machine against a material to be driven. This contact arm enables the operation of the trigger lever that activates the nailing machine when it is pressed against the material to be driven (activates the activation valve), and constitutes a safety mechanism.

Then, as shown in FIG. 5, in a nailing machine for ejecting plate nails, a part of the contact arm 11 is sandwiched between an ejection opening 13 provided in a nose portion 12 and a magazine 1
It was arranged so as to face the front end opening of No. 6 and was configured as a receiving surface for receiving the front surface of the nail pressed by the pusher (not shown) toward the injection port 13 side as indicated by the arrow.

[0004]

However, according to the above configuration, since the contact arm 11 is constantly subjected to the spring load by the pusher, the contact arm 1 is not affected.
When the nail 14 is directly pressed against the contact arm 1,
A frictional resistance is generated between 1 and the nail 14, and the spring force of the return spring must be increased so as to overcome the frictional resistance when returning the contact arm 11 to the top dead center after driving the nail. However, when the spring force is increased, not only the pressing load of the contact arm 11 is increased and the operability is deteriorated, but also the strong pressing force is applied to the driven material 15.
However, there is a problem that the contact arm 11 is pushed by the mark.

The present invention solves the above problems, improves the operability by allowing the contact arm to be pressed with a small load, and prevents the contact arm mechanism of a nailing machine from leaving a contact arm pushing mark on the material to be driven. I will provide a.

[0006]

In order to solve the above problems, a contact arm mechanism of a nailing machine according to the present invention supplies a nail loaded in a magazine to a nose portion provided at a tip of a body, When the tip of a contact arm slidably provided along the nose portion is pressed against the material to be driven and pushed toward the body side, the nail supplied into the nose portion is driven by the striking mechanism provided in the body. In the nailing machine, a receiving portion for receiving the front surface of the leading nail supplied into the nose portion is formed in a portion corresponding to the tip opening portion of the magazine across the nose portion, and the contact arm has the above-mentioned portion. It is characterized in that an opening is formed to avoid the receiving portion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes a body of a nailing machine for driving plate nails such as finish nails and staples and ordinary nails. This body 1 has a known striking mechanism (not shown) inside, and a nose portion 3 in which a nail injection port 2 is located at the lower end of its tip. A straight magazine 4 is connected to the nose portion 3, and a nail 5 is loaded inside the magazine 4 and a spring load shown by an arrow in FIG. It is supplied to the outlet 2.

1 to 4, reference numeral 6 indicates a contact arm which is slidable vertically along the nose portion 3. This contact arm 6 constitutes a safety mechanism like the known one, and when it is pushed out from the lower end of the nose portion 3 by a spring (not shown), the operation of the trigger lever (not shown) is disabled and the lower end When is pressed against the material 7 to be driven, the spring is contracted so that it is pushed toward the body 1 side, and the operation of the trigger lever is made effective to enable the starting.

A contact arm retainer 9 is arranged and fixed on the outside of the contact arm 6. Then, the contact arm retainer 9 has a ridge-shaped receiving portion which receives the front surface of the leading nail 5a supplied into the nose portion 3 at a portion corresponding to the front end opening portion of the magazine 4 with the nose portion 3 interposed therebetween. 10 are formed.

Next, an opening 8 is formed in the contact arm so as to receive the receiving portion 10 of the contact arm retainer 9 and avoid the receiving portion 10. For this reason, the receiving portion 10 has a width narrower than the opening 8 of the contact arm 6 and a length longer than the opening 8 of the contact arm 6.
It is formed to be shorter by the moving distance up and down.

According to the above construction, the spring load of the pusher is applied to the nail 5 in the magazine 4, so that the nail 5 is supplied to the nose portion 3. At this time, since the spring load is received by the receiving portion 10 of the contact arm retainer 9 that contacts the front surface of the leading nail 5a as described above, the contact arm 6 does not receive the spring load at all. Further, since the opening 8 of the contact arm 6 avoids the receiving portion 10, there is no hindrance to vertical sliding. Therefore, the spring load of the spring for returning the contact arm 6 after driving the nail is small, so that it is possible to press the material to be driven 7 with a small load, and the operability of the nail driving machine is improved and the driven material is driven. The inconvenience of making a trace of the contact arm 6 on the material 7 does not occur.

[Brief description of the drawings]

FIG. 1 is a side view showing a part of a nailing machine adopting a contact arm mechanism of a nailing machine according to the present invention.

FIG. 2 is a front view of the nail driver.

FIG. 3 is a perspective view of a contact arm of a nailing machine according to the present invention and a contact arm arm holder related thereto.

FIG. 4 is a vertical sectional view of the contact arm mechanism.

FIG. 5 is an explanatory view of a conventional contact arm mechanism.

[Explanation of symbols]

 1 body 3 nose part 4 magazine 6 contact arm 7 material to be driven 8 opening 10 receiving part

Claims (1)

[Claims] 1. A nail loaded in a magazine is supplied to a nose portion provided at a tip of a body, and a tip of a contact arm slidably provided along the nose portion is pressed against a material to be driven. In the nailing machine that ejects the nails supplied into the nose part by pushing the nose part toward the body side, the nose part is inserted into the nose part at a position corresponding to the tip opening of the magazine. A contact arm mechanism in a nailing machine, characterized in that a receiving portion for receiving a front surface of a nail is formed, and an opening portion for avoiding the receiving portion is formed in the contact arm.