JP3344458B2 - Operation timing adjustment mechanism for continuous driving and single shot driving of a nailing 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 nailing machine which switches between continuous and single shots, and in which the timing of the driving operation can be changed between a continuous shot mode and a single shot mode. The present invention relates to a timing adjustment mechanism.

[0002]

2. Description of the Related Art A nail driving mode using a nail driving machine includes a single-shot driving mode in which the tip of a contact arm is first pressed against a material to be driven and then a nail driving operation is performed only by pulling a trigger lever. 2. Description of the Related Art There is known a continuous driving mode in which a nail is driven by pressing a contact arm against a material to be driven. Single hitting is used for accurately aiming and hitting a nail, and continuous hitting is used for quickly hitting a nail. A nailing machine is provided with a switching mechanism for switching between the two. Also, in any of the driving modes, the operation of the nailing machine is performed by setting the tip of a contact arm slidably provided along a nose forming a nail injection port of the nailing machine body to the material to be driven. Since the pressing operation and the pulling operation of the trigger lever cooperate with each other to press the valve stem of the trigger valve with the contact lever provided on the trigger lever, the operation timing is the same.

[0003]

By the way, in the single-shot mode, the nailing machine generally operates when the trigger lever is pulled, that is, near the end of the operation stroke of the trigger lever, but at the same operation timing. When the mode is switched to the continuous driving mode, the contact arm is pressed against the material to be driven, and the nail driver operates after the tip of the nose lands on the material to be driven. When the impact mechanism operates, a reaction force is applied, and the reaction force largely acts on the hand holding the nailing machine.
In the case of this continuous driving, by operating the nailing machine at the beginning of the operation stroke of the contact arm, that is, while the nose of the nailing machine is moving toward the material to be driven,
Preferably, the recoil due to the operation of the nailing machine is canceled out by offsetting the movement of the nailing machine toward the material to be driven, so that the nail is driven almost simultaneously with the nose landing on the material to be driven. However, if the operation timing is set to the continuous beating mode, the operation timing is too early in the single-shot mode, so that the aim is easily deviated. As described above, there is a disadvantage that the driving feeling is deteriorated in any of the driving modes.

The present invention solves the above-mentioned drawbacks, and can drive a nail at an optimum operation timing in a single-shot mode and a continuous-shot mode, thereby improving the driving feeling. It is an object to provide an operation timing adjusting mechanism.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a continuous and single-shot operation timing adjusting mechanism of a nailing machine according to the present invention is provided with a contact arm attached to a material to be driven while a trigger lever is pulled. Nail driving that can be switched between a continuous driving mode in which the activation valve stem is activated each time it is pressed and a single-shot operation in which the activation valve stem is activated only by pulling the trigger lever after pressing the contact arm first In the apparatus, the trigger lever is provided with a contact lever which is pressed against the valve stem of the trigger valve so as to be movable in a direction crossing the extension of the operation of the valve stem, and the contact lever has both moving end portions. A contact portion that contacts the valve stem at the position is formed. By varying the distance between the stem, time from start of operation of the contact lever until it abuts against the said valve stem, characterized in that the different between the first movement end position and the other moving end position.

[0006]

FIG. 1 is a sectional view of a starting operation portion of a conventional nailing machine. Reference numeral 1 denotes a trigger valve, 2 denotes a contact arm, and 3 denotes a trigger lever 3.

The trigger valve 1 controls the opening / closing operation of the head valve 4. The trigger valve 1 has a valve stem 5, and when the valve stem 5 is pushed in, the head valve 4 is opened, and the inside of the air chamber 7 of the nail driver body 6 is opened. Compressed air is supplied into the striking cylinder 8, and the striking piston 9 and the driver 10 connected thereto are driven to perform the nail driving operation. When the pushing force of the valve stem 5 is released, the head valve 4 closes, the supplied compressed air is exhausted, the striking piston 9 returns, and preparation for the next nail driving is made.

The contact arm 2 is slidably disposed along the nail driving direction with respect to the nail driving machine body 6, and the distal end side thereof is disposed along a nail injection portion (nose portion) (not shown). 2 a is arranged near the trigger valve 1. The contact arm 2 is spring-biased so that the tip of the contact arm 2 always projects from the emitting portion.

The trigger lever 3 is swingably supported by a support shaft 15 as shown in FIGS. 1 and 2, and is biased by a spring 11 to be separated from the valve stem 5. A contact lever 12 is rotatably supported on the trigger lever 3 by a pin 13. The contact lever 12 is an elongated member bent in a Z-shape, and is disposed so as to be able to engage with the valve stem 5 and the contact arm 2.

The contact lever 12 is supported by a pin 13 provided on a contact lever guide 14. The contact lever guide 14 moves along a slide groove 16 formed on the trigger lever 3 (see FIG. 3). Are slidably mounted in the longitudinal direction of the device, and are urged by a spring 17 so as to be located on the nailer body 6 side (the left side in the figure). Therefore, the contact lever 12 also moves according to the moving position of the contact lever guide 14,
In this case, the contact lever 12 is
Across the base 2a of the contact arm 2
1 and FIG. 4 to FIG. 6 and a second position (FIG. 7 to FIG.
(Position 0). In addition, in the second position, when the trigger lever 3 is pulled, the pin 13 rotates around the pin 13 to disengage from the base end 2a of the contact arm 2 in a non-operating state (see FIG. 9 described later), and It is arranged to evacuate. The contact lever 12 is always spring-biased toward the first position.

The contact lever 12 engages with the base end 2a of the contact arm 2 and has a first contact portion 18 which contacts the valve stem 5 at a first position and a second position, respectively. A second contact portion 19 is formed. The first contact portion 18 is formed in a flat shape, and the second contact portion 19 is formed in an inclined shape. For this reason, the first contact portion 18
The distance h1 between the valve stem 5 and the valve stem 5 is smaller than the distance h2 between the second contact portion 19 and the valve stem 5.

Next, a pin 20 is fixed to a substantially intermediate portion of the trigger lever 3, and a torsion coil spring 21 is attached to the pin 20.
Is attached. One end 21 of torsion coil spring 21
“a” is arranged to be engageable with the base end 2 a of the contact arm 2, and the other end 21 b is engageable with the front end of the contact lever guide 14.

The contact lever 12 has an engagement hole 2.
2 is formed, and the nailing machine main body 6 is provided with an engaging rod 23 corresponding thereto. The engagement rod 23 is a spring 24
Urged in the direction of engagement with the engagement hole 22.

Here, an operation mode of the nailing machine having the above configuration will be described. First, when the continuous driving mode is set, the trigger lever 3 is pulled from the preparation state of FIG. 1 as shown in FIG. 4, and then the contact arm 2 is pressed against the workpiece. As a result, the base end 2a of the contact arm 2 pushes up the contact lever 12 (see FIG. 5), so that the contact lever 12 pushes the valve stem 5, the trigger valve 1 is activated, and the nailing machine is driven into the nail. When the contact arm 2 is separated from the material to be driven after nailing, the contact arm 2 returns to the original position as shown in FIG. 6 and the pushing force against the valve stem 5 is lost, so that the contact lever 12 is also returned to the original position. Return. When the contact arm 2 is pressed against the material to be driven again in this state, the contact lever 12 is pushed up and the valve stem 5 is pressed, so that the nailing machine operates again. Therefore, by repeatedly pressing and releasing the contact arm 2 while pulling the trigger lever 3, nails can be driven continuously. By releasing the trigger lever 3, the nailing machine returns to the initial state of FIG.

In the continuous striking mode, since the trigger lever 3 is pulled first, the one end of the torsion coil spring 21 moves to a position retracted from the movement locus of the base end 2a of the contact arm 2, so that the contact lever guide 14 is It has been moved forward by the spring 17 and the contact lever 12 is also in the first position.

On the other hand, in the single shot mode, the contact arm 2 is first pressed against the material to be driven as shown in FIG. 7 from the ready state of FIG. In this case, the base end 2a of the contact arm 2 pushes up the contact lever 12 and pushes up one end 21a of the torsion coil spring 21 by pressing. For this reason, the torsion coil spring 21
Rotates around the pin 20, and the other end 21 b moves the contact lever guide 14 backward against the spring 17. Therefore, the contact lever 12 also moves to the second position. When the trigger lever 3 is pulled in this state, FIG.
As described above, the contact lever 12 pushes the valve stem 5, the trigger valve 1 is operated, and the nailing machine operates to drive the nail. However, as shown in FIG.
Is at the second position, the pulling of the trigger lever 3 causes the engaging rod 23 to engage with the engaging hole 22, and the contact lever 12 is held at the second position.

When the contact arm 2 is separated from the material to be driven after nailing, the contact arm 2 returns to its original position as shown in FIG. 9 and the pushing force is lost. The contact arm 2 rotates as before, comes off the base end 2a of the contact arm 2 in a non-operating state, and retreats from its movement locus. Therefore, even if the contact arm 2 is pressed against the material to be driven again in this state, the contact arm 2 operates idle and the contact lever 12 cannot be pushed up as shown in FIG.
The valve stem 5 is not pushed in and the nailer does not operate.
In order to restart the nailing machine, the trigger lever 3 must be released once and rocked to the original position. As a result, the engagement between the engagement rod 23 and the engagement hole 22 is released, so that the contact lever guide 14 is moved forward by the spring 17 and the contact lever 12 is moved to the first position. It will be in the initial state. When the operation sequence of pressing the contact arm 2 again and then pulling the trigger lever 3 is followed, the next nail driving operation is performed.

According to the switching mechanism described above, the driving mode is automatically switched by the operation of pulling the trigger lever 3 first or pressing the contact arm 2 first, but as shown in FIG. When the contact lever 12 is in the second position, the distance h1 between the first contact portion 18 and the valve stem 5 when the contact lever 12 is in the second position is larger than the distance h1 between the first contact portion 18 and the valve stem 5. The distance between the valve stem 5 and the valve stem 5 is smaller than h2. For this reason, in the continuous driving mode, the time from the start of the pressing operation of the contact arm 2 to the time when the contact lever 12 comes into contact with the valve stem 5 and pushes up to the position where the nail driver operates is short, and in the single-shot driving mode, the trigger lever is pressed. The time from the first pulling of the lever 3 until the contact lever 12 comes into contact with the valve stem 5 and pushes it up to the position where the nailing machine operates is lengthened, and the operation timing is adjusted.

Therefore, in the continuous driving mode, the operation timing of the nailing machine is relatively early, and the tip of the contact arm 2 is operated by abutting the material to be driven, and the nose of the nailing machine is moved to the material to be driven. Since the nailing machine operates while moving toward, the recoil of driving is small,
The driving feeling is good. On the other hand, in the single shot mode, since the operation timing is slightly delayed, the nail driving machine is operated just before the trigger lever 3 is pulled, so that the aim is less disturbed and the driving feeling is good. In this way, a nailing machine with a good driving feel and operation feeling can be obtained in any mode.

In the above-described example, the driving mode is automatically switched. However, the operation timing adjusting mechanism for the continuous driving and the single driving is not limited to the automatic switching. A manual switching method may be used.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a switching mechanism between continuous and single shots in a non-operating state.

FIG. 2 is an assembly drawing of a trigger lever.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is an explanatory view of an operation mode in a state where a trigger lever is first pulled.

FIG. 5 is an explanatory view of an operation mode in a state where a contact arm is pressed next.

FIG. 6 is an explanatory view of an operation mode in a state where the contact arm is further separated from the driven member.

FIG. 7 is an explanatory view of an operation mode in a state where the contact arm has been pressed first.

FIG. 8 is an explanatory view of an operation mode in a state where the trigger lever is pulled next.

FIG. 9 is an explanatory view of an operation mode in a state where the contact arm is further separated from the driven member.

FIG. 10 is an explanatory view of an operation mode in a state where the contact arm is pressed again.

[Explanation of symbols]

 2 Contact Arm 3 Trigger Lever 5 Valve Stem 12 Contact Lever 18 First Contact Part 19 Second Contact Part

Claims (1)

(57) [Claims] 1. A continuous driving mode in which a start valve stem is actuated each time a contact arm is pressed against a workpiece while a trigger lever is pulled, and a trigger lever is pulled after a contact arm is pressed first. In the nailing machine, which can be switched to a single-shot mode in which the actuation valve stem is operated only by the trigger lever, the trigger lever has a contact lever which pushes against the valve stem of the trigger valve to extend the operation of the valve stem. The contact lever is formed so as to be movable in the transverse direction, and the contact lever has a contact portion that contacts the valve stem at both moving end positions, and the distance between the contact portion and the valve stem at each of the moving end positions is increased. By changing the time, the time from the start of operation of the contact lever to the contact with the valve stem , The first movement end position and the other of the nailing machine of the continuous beating and single handed actuation timing adjustment mechanism for different way thing characterized by the moving end position.