JP4075462B2 - Contact lever of trigger lever for starting nailer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a contact lever of the starting trigger lever of the nailing machine to be subjected to the switching mechanism for switching between continuous beating and single handed automatically.
[0002]
[Prior art]
The nail driving mode with the nail driver includes the single shot mode in which the nail is driven only by first pulling the trigger lever after pressing the tip of the contact arm against the material to be driven, and the trigger lever is first pulled. A continuous driving mode is known in which a nail driving operation is performed by pressing the contact arm against the driven material. Single shots are used when aiming nails accurately, and continuous hits are used when nails are driven quickly. A nailing machine is provided with a switching mechanism for switching between the two.
[0003]
As a mechanism for switching between the single shot mode and the continuous shot mode, a mechanism for changing the position of the contact arm, a mechanism for changing the pulling position of the trigger lever , or a mechanism for moving the trigger lever are known.
[0004]
[Problems to be solved by the invention]
However, according to the conventional driving mode switching mechanism, in order to switch the mode, a switching operation for changing or moving the position of the contact arm or the trigger lever is necessary, and the operation is mistaken or forgotten. There was a problem.
[0005]
In the present invention , the contact lever provided on the trigger lever operates the trigger valve by the cooperation of the push-up operation by the base end of the contact arm and the swing accompanying the pull-up operation of the trigger lever in both single shot and continuous strike. In particular, it is an object of the present invention to provide a contact lever for a trigger lever for starting a nail driver that is useful for a switching mechanism that automatically switches a driving mode .
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the contact lever mechanism of the trigger lever for activation of the nailing machine according to the present invention is slidably arranged along the nail driving direction with the valve stem that controls the operation of the trigger valve for activation. A contact lever arranged between the base end of the contact arm is provided on a trigger lever pivotally supported by the nailing machine body, and the contact lever is pushed up by the base end of the contact arm and Single shot mode in which the trigger valve is operated by pushing in the valve stem only when the trigger lever is lifted after the push-up operation of the base end of the contact arm in cooperation with the swing associated with the pull-up operation of the trigger lever. When the trigger lever is pulled up, the base end of the contact arm is pushed up In contact lever mechanism for starting the trigger lever of the nailing machine in which a continuous beat mode for operating the trigger valve push the valve stem slidably contact lever provided on the trigger lever along the sliding groove At the time of pulling operation of the trigger lever, the contact arm side end of the contact lever is provided so that it can be rotated in accordance with the push-up operation of the base end of the contact arm. It is possible to move to either the first position for entering the continuous trajectory mode on the movement trajectory and the second position for retracting from the trajectory of the proximal end of the contact arm before the push-up operation to enter the single shot mode. When the trigger lever is returned to the state before the pulling operation, the contact arm moves forward on the movement trajectory. Position with biasing spring by a compression spring provided along the sliding groove to move, between the nailing machine main body and the trigger lever, the trigger lever pull operated, and the contact Holding means for holding the contact lever at the second position against the spring bias by the compression spring when the lever is moved to the second position is provided, and the trigger lever is returned to the state before the pulling operation. The above-mentioned holding is canceled when the
[ 0007 ]
【The invention's effect】
According to the first aspect of the present invention, when the contact lever is in the first position, the base end of the contact arm is accompanied by pressing the contact arm against the driven material after the trigger lever is first lifted. As a result of the push-up operation, the contact arm and the trigger lever cooperate to push up the contact lever and push in the valve stem, thereby starting the nailing machine. Then, when the trigger arm is pulled, the contact arm is separated from the material to be driven and pressed against the material to be driven again, the nailing machine is similarly activated. That is, continuous hitting is possible.
On the other hand, when the contact lever is in the second position, if the trigger lever is first lifted, the contact arm side end of the contact lever retracts from the movement locus of the base end of the contact arm before the push-up operation. Therefore, even if the contact arm is pressed against the driven material after that, the contact lever does not operate. Therefore, the contact arm does not cooperate with the trigger lever and the nailer does not start. In other words, continuous hitting is not possible. On the other hand, if the trigger lever is lifted after the contact arm is first pressed against the material to be driven, the contact arm and the trigger lever cooperate to push the contact lever and push the valve stem. To do. However, after the nail driving is finished, if the contact arm is released from the driven material while the trigger lever is pulled up, the base end of the contact arm is in the state before the push-up operation, and the end of the contact lever on the contact arm side is the contact arm side. It retreats from the movement trajectory of the base end. Therefore, continuous hitting is not possible. The nailing machine is activated only when the trigger lever is returned to the state before the pulling operation, the contact arm is pressed against the material to be driven again, and then the trigger lever is pulled. Therefore, only a single shot is possible.
As described above, the contact lever that directly pushes the valve stem stem of the trigger valve is moved to the first position, unlike the case where the driving mode is switched by changing or moving the position of the contact arm or the pulling position of the trigger lever. Alternatively, continuous hitting and single shots are possible with a simple configuration of moving to the second position. The movement of the contact lever can be linked to the operation of the contact arm or trigger lever. Therefore, the contact lever is very useful for a switching mechanism that automatically switches the driving mode according to the driving operation.
[ 0008 ]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view of a starting operation portion of a normal nailing machine. Reference numeral 1 denotes a trigger valve, 2 denotes a contact arm, and 3 denotes a trigger lever.
[ 0009 ]
The trigger valve 1 controls the opening / closing operation of the head valve 4, and includes a valve stem 5. When the valve stem 5 is pushed in, the head valve 4 is opened, and the compressed air in the air chamber 7 of the nailing machine body 6 is compressed. The hammer 10 is supplied into the striking cylinder 8 and the striking piston 9 and the driver 10 coupled thereto are driven to perform a nail driving operation. When the pushing force of the valve stem 5 is released, the head valve 4 is closed, the supplied compressed air is exhausted, the striking piston 9 returns, and preparation for the next nail driving is performed.
[ 0010 ]
The contact arm 2 is slidably arranged along the nail driving direction with respect to the nailing machine main body 6, the distal end side thereof is arranged along a not-shown nail injection portion (nose portion), and the base end 2a is a trigger. It is arranged in the vicinity of the valve 1. The contact arm 2 is spring-biased so that the tip of the contact arm 2 always protrudes from the injection portion.
[ 0011 ]
The trigger lever 3 is supported between the valve stem 5 of the trigger valve 1 and the base end 2a of the contact arm 2 and is swingably disposed on the support shaft 11. 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 engageable with the valve stem 5 and the contact arm 2. The trigger lever 3 is urged so that the contact lever 12 is separated from the valve stem 5 by a spring 14 provided between the trigger lever 3 and the nailing machine body 6.
[ 0012 ]
The above-described configuration is known, and according to this, the contact arm 2 slides along the nailing machine body 6 by pressing the tip of the contact arm 2 against the material to be driven, and the base end 2a pushes up the contact lever 12. However, the contact lever 12 cannot be engaged with the valve stem 5 only by this. Similarly, the contact lever 12 approaches the valve stem 5 by pulling the trigger lever 3 and swinging it, but it cannot engage with the valve stem 5 by itself. Only when the push-up operation by the contact arm 2 and the swinging of the trigger lever 3 cooperate, the contact lever 12 pushes the valve stem 5 to activate the trigger valve 1.
[ 0013 ]
By the way, the contact lever 12 is supported by a pin 13 provided on the contact lever guide 15, and the contact lever guide 15 slides in the longitudinal direction along the sliding groove 20 formed in the trigger lever 3 (see FIG. 2). It is movably attached and is urged by a spring 17 so as to be positioned on the nailing machine body 6 side (left side in the figure). Accordingly, the contact lever 12 also moves in accordance with the movement position of the contact lever guide 15. In this case, the contact lever 12 advances on the movement locus of the base end 2a of the contact arm 2 with the trigger lever 3 pulled. The first position that can be deeply engaged with the base end 2a of the contact arm 2 (the position shown in FIGS. 3 to 5 described later) and the second position that can be engaged shallowly (the later described FIGS. 7 to 9). Position). In addition, in the second position, when the trigger lever 3 is pulled, the contact arm 2 is rotated before the contact lever 2 is rotated around the pin 13 to press the contact arm 2 against the workpiece and the contact lever 12 is pushed up to operate. It is arranged so as to be disengaged from the base end 2a (see FIG. 8 to be described later) and retreat from the movement locus. The contact lever 12 is constantly biased toward the first position. In addition, when the trigger lever 3 is returned to the state before the pulling operation, the contact lever 12 is in both the first position and the second position as shown in FIG. 1 (in the case of the first position) and FIG. As shown in the case of the second position), the contact arm 2 is disposed so as to be engaged with the base end 2a.
[ 0014 ]
Next, a pin 18 is fixed to a substantially middle portion of the trigger lever 3, and a torsion coil spring 19 is attached to the pin 18. One end 19 a of the torsion coil spring 19 is disposed at the base end 2 a of the contact arm 2, and the other end 19 b is disposed at the front end of the contact lever guide 15. As a result, one end 19a of the torsion coil spring 19 engages with the base end 2a when the contact arm 2 is slid without pulling the trigger lever 3 and rotates around the pin 18, and the torsion coil spring 19 is rotated. The other end 19b functions as an operating means for moving the contact lever 12 to the second position. The one end 19a of the torsion coil spring 19 is provided so as to move to a position where it is retracted from the movement locus of the base end 2a of the contact arm 2 as the trigger lever 3 swings.
[ 0015 ]
An engagement hole 21 is formed in the contact lever 12, and an engagement rod 22 is provided in the nailing machine body 6 correspondingly. The engagement rod 22 is engaged with the engagement hole 21 by a spring 23. It is energized in the direction to do. As a result, when the trigger lever 3 is pulled with the contact lever 12 in the second position, the engagement rod 22 engages with the engagement hole 21 to hold the contact lever 12 in the second position. Acts as a means.
[ 0016 ]
Here, an operation mode of the nailing machine having the above-described configuration will be described. First, when the continuous driving mode is set, first, the trigger lever 3 is pulled from the preparation state of FIG. 1 as shown in FIG. 3, and then the contact arm 2 is pressed against the material to be driven. As a result, the base end 2a of the contact arm 2 pushes up the contact lever 12 (see FIG. 4), so that the contact lever 12 pushes the valve stem 5, the trigger valve 1 is actuated, and the nail driver is actuated. After the nail is driven, when the contact arm 2 is separated from the material to be driven, the contact arm 2 returns to the original position as shown in FIG. 5 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 again pressed against the driven material in this state, the contact lever 12 is pushed up and the valve stem 5 is pressed, so that the nail driver is driven again. Therefore, if the operation of pressing and releasing the contact arm 2 while repeating the trigger lever 3 is repeated, the nail can be driven continuously. By releasing the trigger lever 3, the nailer returns to the initial state of FIG.
[ 0017 ]
In the continuous hammering mode, the trigger lever 3 is pulled first, so that the one end 19a of the torsion coil spring 19 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 15 has a spring 17 The contact lever 12 is also in the first position.
[ 0018 ]
On the other hand, when the single shot mode is set, the contact arm 2 is first pressed against the material to be driven as shown in FIG. 6 from the preparation state shown in FIG. In this case, the base end 2 a of the contact arm 2 pushes up the contact lever 12 and pushes up the one end 19 a of the torsion coil spring 19 by pressing. Therefore, the torsion coil spring 19 rotates around the pin 18 and the other end moves the contact lever guide 15 backward against the spring 17. For this reason, the contact lever 12 also moves to the second position.
[ 0019 ]
When the trigger lever 3 is pulled in this state, the contact lever 12 pushes the valve stem 5 as shown in FIG. 7, the trigger valve 1 is activated, and the nail driver is driven to nail. However, since the contact lever 12 is in the second position as shown in the figure, by pulling the trigger lever 3, the engagement rod 22 is engaged with the engagement hole 21, and the contact lever 12 is held in the second position. Will be.
[ 0020 ]
After the nail is driven, when the contact arm 2 is separated from the material to be driven, the contact arm 2 returns to the original position as shown in FIG. 8 and the push-up force is lost. , Moves away from the base end 2a of the contact arm 2 in the non-operating state, and retreats from the movement locus. Therefore, even if the contact arm 2 is again pressed against the driven material in this state, the contact arm 2 is idled as shown in FIG. 9 and the contact lever 12 cannot be pushed up. Therefore, the valve stem 5 is not pushed in, and the nail driving is performed. The machine does not work. In order to restart the nailing machine, the trigger lever 3 must be once released and swung to the original position. As a result, the engagement between the engagement rod 22 and the engagement hole 21 is released, so that the contact lever guide 15 is moved forward by the spring 17 and the contact lever 12 is moved to the first position, as shown in FIG. 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 performed, the next nail driving operation is performed.
[ 0021 ]
As described above, when the trigger lever 3 is pulled first, the contact lever 12 is held at the first position by the spring force. Therefore, each time the contact arm 2 slides, the contact lever 12 is moved to the valve stem. 5 is pushed, the trigger valve 1 is actuated, and the nailing machine can be continuously driven to nail.
[ 0022 ]
On the other hand, when the contact arm 2 is pressed first, the operating means (torsion coil spring 19) engages with the base end 2a of the contact arm 2 and the contact lever 12 moves to the second position. By pulling the trigger lever 3, a nail driving operation is performed. However, since the contact lever 12 is held at the second position by the holding means (engagement hole 21 and engagement rod 22) at this time, when the contact arm 2 is separated from the material to be driven and inactivated, The contact lever 12 retreats from the movement locus of the base end 2 a of the contact arm 2. Therefore, even if the contact arm 2 is again pressed against the driven material and slid, the idle operation is performed and the nail driver is not started. Once the contact lever 12 is not moved to the first position by releasing the trigger lever 3 and releasing the holding by the holding means, the initial state is not restored.
[0023]
As described above, since the contact lever 12 that directly pushes the valve stem 5 of the trigger valve 1 is moved to the first position or the second position, continuous and single shots can be performed. Depending on whether the trigger lever 3 is pulled or the contact arm 2 is pushed up to perform the push-up operation, it is possible to automatically switch between the continuous hit mode and the single shot mode. Further, the movement of the contact lever 12 can be interlocked with the operation of the contact arm 2 and the trigger lever 3. Therefore, the contact lever mechanism is very useful for a switching mechanism that automatically switches the driving mode according to the driving operation.
[Brief description of the drawings]
1 is a cross-sectional view of the main part of a switching mechanism between continuous and single shots in a non-actuated state. FIG. 2 is a cross-sectional view taken along the line XX in FIG. 1. FIG. Fig. 4 is an explanatory diagram of the operation state when the contact arm is pressed and operated. Fig. 5 is an explanatory diagram of the operation mode when the contact arm is separated from the driven material. Fig. 6 is the contact arm first. FIG. 7 is a diagram illustrating the operation mode when the trigger lever is pulled. FIG. 8 is a diagram illustrating the operation mode when the contact arm is separated from the workpiece. FIG. Explanatory drawing of the operating mode when the contact arm is pressed again.
DESCRIPTION OF SYMBOLS 1 Trigger valve 2 Contact arm 2a Base end 3 Trigger lever 5 Valve stem 6 Nailing machine body 12 Contact lever

Claims (1)

A contact lever arranged between the valve stem that controls the operation of the trigger valve for activation and the base end of the contact arm that is slidable along the nail driving direction is swingable to the main body of the nailing machine. The contact lever is provided on a pivotally supported trigger lever, and the contact lever is operated after the push-up operation of the base end of the contact arm by the cooperation of the push-up operation by the base end of the contact arm and the swing accompanying the pull-up operation of the trigger lever. Only when the trigger lever is lifted, the single shot mode in which the valve stem is pushed in to operate the trigger valve, and the valve is lifted whenever the base end of the contact arm is pushed up with the trigger lever lifted. For nailing machine start-up, which is a continuous driving mode in which the trigger valve is operated by pushing the stem In the contact lever mechanism of Rigareba,
A contact lever provided on the trigger lever is slidably attached along the sliding groove, and is provided to be rotatable in accordance with a push-up operation of the base end of the contact arm.
In the state when the trigger lever is pulled, the end of the contact lever on the side of the contact arm advances on the movement locus of the base end of the contact arm to enter the continuous hit mode and before the push-up operation When the trigger lever is returned to the state before the pulling operation, the contact arm moves when the trigger lever is moved to any one of the second positions to be retracted from the movement locus of the proximal end of the contact arm and set to the single shot mode. While being urged by a compression spring provided along the sliding groove so as to move to a position to advance on the locus,
The contact between the nailing machine main body and the trigger lever against the spring bias by the compression spring when the trigger lever is pulled and the contact lever is moved to the second position. A contact lever mechanism for a trigger lever for starting a nailing machine, characterized in that a holding means for holding the lever in a second position is provided, and the holding is released when the trigger lever is returned to the state before the pulling operation. .

Images