JP2002346950A - Blank shot preventing mechanism for nailer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a blank shot reliably irrespective of the size of a nail and the position of a nailhead. SOLUTION: A first blank shot preventing member 28 is arranged on a trigger lever 16 so that a base end is pivotable. A second blank shot preventing member 29 is slidably arranged so that an upper end near a free end of the first blank shot preventing member is movable between a first position wherein it supports up the free end of the first blank shot preventing member, and a second position wherein it does not support up the free end of the first blank shot preventing member. A third blank shot preventing member 25 is arranged in a position opposed to a lower end of the second blank shot preventing member, and is movable in a nail supplying direction of a magazine 13 so as to move, when engaging a pusher 24, to an actuating position from an initial position wherein it is located under a lower end face of the second blank shot preventing member to maintain the second blank shot preventing member in the first position. The third blank shot preventing member, when in the actuating position, retracts from under the lower end face of the second blank shot preventing member to permit the second blank shot preventing member to move to the second position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nailing machine having an idle driving prevention mechanism, and more particularly to a nailing machine having no contact member for starting a nailing machine in contact with a material to be driven. The present invention relates to an idle hit prevention mechanism.

[0002]

2. Description of the Related Art In a nailing machine for finishing nails or the like having a contact member as a safety device provided so as to protrude toward a tip end of a nose portion forming an injection opening for nailing, the finishing nail is set in a magazine. The pusher, which elastically presses the back, advances with the consumption of nails in the magazine, and when the nails are gone, the protrusion formed in front of the pusher engages with the contact member that slides along the nose. An idle driving prevention mechanism that locks the contact member and operates the trigger lever to prevent the nailing machine from starting because the contact member as a safety device does not operate.

[0003]

The problem with this mechanism is that when the contact member is pressed against the material to be driven and the shearing is performed, the contact member is always operated at the operating position. When the inside nail is lost, even if the protrusion of the pusher comes into contact with the contact member, the pusher cannot enter the notch, and the contact member cannot be locked in the inoperative position. Therefore, if the nail in the magazine is lost during the above-mentioned slip driving, the blank is hit and the material to be driven is damaged. In order to perform such slippage, a contact member as a safety device does not function and is unnecessary, and a nailing machine without a contact member has appeared. Further, there is a demand for a mechanism for preventing an idle driving in a nailing machine without a contact member as a safety device.

[0004] In a nailing machine that hits a staple molded in a U-shape, the setting of the finish nail and the nail in the magazine is different, and the staple is always arranged at the top regardless of the size used. As an idle hit prevention mechanism, an opening is formed in the upper surface of the magazine, and a sign for preventing the idle hit is taken by a member that contacts the upper surface of the staple. In the case of finish nails, the setting of the nails in the magazine is arranged downward, the position of the nail head in the magazine differs depending on the length of the nail used, except when the nail size used is a fixed model, A hitting prevention mechanism cannot be arranged on the upper surface of a magazine unlike a nailing machine for staples.

According to the present invention, even if the nailing machine is not provided with a contact member, the nailing can be reliably performed regardless of the size of the nail used and the position of the nail head in the magazine. An object of the present invention is to provide an idle driving prevention mechanism for a nailing machine that can prevent the driving.

[0006]

In order to solve the above-mentioned problems, the present invention provides an idle hit prevention mechanism which is capable of rotating a first member for actuating the driving means on a trigger lever by pivotally supporting a base end thereof. , The upper end is located near the free end of the first member, and a first position for supporting the free end of the first member upward, and the free end of the first member is positioned upward. A second member that is movable between a second position that is not supported by the second member and a second member that is slidably disposed at a position facing the lower end of the second member; Moveable along a direction, and actuated by engaging the pusher from an initial position disposed below a lower end surface of the second member to maintain the second member in the first position. A third member that is moved to a position, wherein the third member is in the operating position. In, wherein the second member and the second member is retracted from the lower end surface lower was made to allow the movement to the second position.

According to a second aspect of the present invention, a first member for activating the driving means is rotatably disposed on a trigger lever by pivotally supporting a base end thereof, and an upper end thereof is provided with the first member. Between a first position disposed near the free end of the member and supporting the free end of the first member upward, and a second position not supporting the free end of the first member upward; A second member movable in the manner described above is slidably provided, and a lower end of the second member is disposed so as to enter the magazine from an opening formed in the magazine, and the second member is engaged with a nail in the magazine. A third member that is rotated by the combination is disposed, and a lower end of the second member is disposed to face the third member.

[0008]

As described above, according to the present invention, since the third member operated by the pusher and the second member whose up and down movement is controlled by the third member are provided, safety is provided. It is possible to mount the idle driving prevention mechanism on a nailing machine that does not have a contact member as an apparatus. In addition, since the contact member protruding from the tip of the nose is not used, even when the nail is being driven, the blank hit prevention works when the nail in the magazine is gone, and the material to be driven may be damaged. Can be prevented. Furthermore, even in a magazine in which nails such as finish nails are arranged in a lower position, and the position of the nail head changes depending on the size to be used, a blank hitting prevention mechanism can be arranged on the upper surface of the magazine. It is possible to reduce the size of the machine.

[0009]

Embodiments of the present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 shows a nailing machine 10 provided with an idle driving prevention mechanism according to an embodiment of the present invention, and a hollow housing 1 integrally formed with a grip portion 11.
A piston / cylinder mechanism constituting a drive mechanism (not shown) is housed in the housing 2 and is supported between a rear portion of the grip portion and a nose portion 14 forming an injection port of a nail. The connecting nail loaded in the magazine 13 is driven from the nail injection port toward the material to be driven by the nail driving mechanism.

A plug 15 connected to a source of compressed air
Compressed air supplied via the gripper 11 is operated by a trigger lever 16 arranged at the base of the grip 11, whereby compressed air is introduced into the cylinder of the drive mechanism, and the piston is driven. Is operated in the nail injection port of the nose part 14 to drive the first nail of the connection nail supplied into the nail injection port from the nail injection port. At the lower part of the trigger lever 16, when the nail in the magazine 13 runs out, the operation of the trigger lever is invalidated to prevent the nail driving machine from starting, and an idle hit prevention mechanism 20 is provided.
Are formed.

A first embodiment of the idling prevention mechanism will be described with reference to FIGS. A magazine 13 accommodating a large number of nails connected to each other is supported by a magazine body 22 having a front end fixed to a wear plate 21 constituting a nose portion 14 and slidably with respect to the magazine body 22. The slider 23 is slid rearward with respect to the magazine main body 22, thereby opening the side surface of the magazine main body and loading nails. Further, the magazine 1 has a magazine 1
A pusher 24 is provided which engages with the last one of the connecting nails loaded in 4, presses the connecting nail forward, and feeds the leading nail into the ejection opening of the nose portion 14.

Outside the magazine main body 22, there is provided a third idle hit prevention member 25 slidably disposed along the side surface of the magazine main body 22, and the third idle hit prevention member 25 is provided. The front end portion 25 is bent substantially at a right angle, and the front end portion 25 a is arranged so as to face the pusher 24. The pusher 24 has a protrusion 2 protruding forward.
A projection 4a is formed, and the projection 24a can be brought into contact with the front end 25a of the third idle hit prevention member 25. The third blanking prevention member 25 is constantly urged toward the rear of the magazine by the action of the spring 26, and is brought into contact with the projection 24a of the pusher 24 pressing the nail in the magazine 13 so as to move forward. Moved to The projection 24a of the pusher 24 is used to prevent the nail 13 from moving out of the nose portion 14 and move to a position at which the magazine 13 has no nail.
Of the third hitting prevention member 25 by engaging with the front end portion 25a of the
Is to be moved forward. The spring 26 is set to have a sufficiently small pressing force that the pusher 24 presses the nail in the magazine toward the ejection port, so as not to prevent the pusher 24 from supplying the nail.

A trigger lever 16 rotatably attached to the base of the grip portion 11 of the nailing machine 10 includes a nailing machine 1
A base end of a first idle hit prevention member 28 for operating a trigger valve stem 27 for activating the valve 0 is rotatably pivotally supported. A second idle hit prevention member 29 having an upper end 29a disposed on the lower surface facing the free end of the first idle hit prevention member 28 is supported by the magazine body 22 slidably in the vertical direction. The lower end 29b of the second idle hit prevention member 29 is disposed to face the rear end 25b of the third idle hit prevention member 25.
The second idle hit prevention member 29 is constantly urged upward by a spring 30. When the trigger lever 16 is not operated, the lower end portion 29 of the second idle hit prevention member 29 is turned off.
b is kept out of contact with the rear end portion 25b of the third idle hit prevention member 25. This reduces the resistance when the third idle hit prevention member 25 is moved by the pusher 24 to prevent malfunction. The load of the spring 30 for urging the second idle hit prevention member 29 upward is set sufficiently smaller than the operation load of the trigger valve stem 27, and the first idle hit prevention member 2
8 allows the free end side to push down the second idle hit prevention member 29 without operating the trigger valve stem 27.

FIG. 4 shows the operation of the idle hit prevention mechanism of the above embodiment.
And FIG. FIG. 4 shows a state in which nails remain in the magazine 14, and the pusher 24 is engaged with and pressed against the last nail shaft of the nails in the magazine. In this case, the pusher 24 is formed in front of the pusher 24. The protrusion 24a is not in contact with the front end 25a of the third blank hit prevention member 25. Therefore, the rear end portion 25b of the third idle prevention member 25
Is disposed below the lower end portion 29b of the second idle hit prevention member 29 by being pressed by the spring 26.

When the trigger lever 16 is not operated, the second idle hit prevention member 29 is always arranged upward by the spring 30, and the upper end 29a of the second idle hit prevention member 29 is moved to the first position. The free end of the first idle hit prevention member 28 is rotated upward by contact with the free end of the idle hit prevention member 28. The second idle hit prevention member 29 is always urged upward by a spring 30. When the trigger lever 16 is not operated, the lower end of the second idle hit prevention member 29 is closed by the third idle hit prevention. The contact member 25 is maintained in a state where it does not contact the member 25.

When the trigger lever 16 is pulled, the base end side of the first idle hit prevention member 28 supported by the trigger lever 16 moves upward, and the central portion of the first idle hit prevention member 28 moves upward. It comes into contact with the trigger valve stem 27. Since an operation load such as a compressed air pressure is applied to the trigger valve stem 27, the central portion of the first idle hit prevention member 28 is received by the trigger valve stem 27, and the trigger valve stem 27 rotates. And the first blanking prevention member 2
8, the free end side is moved downward. By this movement, the second idle hit prevention member 29 is moved downward against the spring 30.
The lower end 29b of the first abutment prevention member 25 is in contact with the rear end 25b of the third idle prevention member 25 and is prevented from descending, so that the free end of the first idle prevention member 28 is supported at the upper position, Further, when the trigger lever 16 is pulled, the first idle hit prevention member 28 is rotated about the free end side, and the central portion of the first idle hit prevention member 28 moves upward. The nail driving machine is activated by pushing up the trigger valve stem 27.

When the last nail in the magazine 13 is driven, a projection 2 formed in front of the pusher 24 is formed.
4a comes into contact with the front end 25a of the third idle hit prevention member 25, and presses and moves the third idle hit prevention member 25 toward the front of the magazine 13 against the spring 26. The rear end of the third idle hit prevention member 25 is retracted from a position below the lower end of the second idle hit prevention member 29 to restrict the downward movement of the second idle hit prevention member 29. Is released and it is possible to move downward.

When the trigger lever 16 is pulled, the first idle hit prevention member 28 rotatably supported by the trigger lever 16 is rotated, and the center portion contacts the trigger valve stem 27 and is free. The end side is moved downward, and the second idle hit prevention member 29 disposed in contact with the free end is pressed downward. Since the rear end 25b of the third idle hit prevention member 25 that has received the lower end 29b of the second idle hit prevention member 29 has moved forward, the lower end of the second idle hit prevention member 29 has The portion 29b is not received, and the second idle hit prevention member 29 moves downward. Therefore, the first
Is rotated about a central portion in contact with the trigger valve stem 27, and the trigger valve stem 27 is not operated. As a result, the nailing machine is not started, and the idling prevention functions.

A second embodiment of the present invention will be described with reference to FIGS. In this embodiment, a second idle hit prevention member 31 is disposed below the free end of the first idle hit prevention member 28 supported by the trigger lever 16 so as to be vertically movable. Is inserted into the magazine 13 through the opening 32 formed in the magazine main body 22, and the lower end 31b of the second idle hit prevention member 31 A third idle hit prevention member 33 is rotatably supported by a pivot 34 at the opposed portion. A part of the third idle prevention member 33 is advanced to the nail loading portion of the magazine 13 and is engageable with the nail shaft loaded in the magazine 13.

When the nail remains in the magazine 13, the third blanking prevention member 33 comes into contact with the nail shaft and the pivot 34
And a part of the third idle prevention member 33 is disposed at a position facing the lower end 31 b of the second idle prevention member 31. As a result, the downward movement of the second idling prevention member 31 is restricted, and the free end side of the first idling prevention member 28 by the operation of the trigger lever 16 is supported at the upper position and the trigger valve stem The operation of step 27 is made valid to activate the nailing machine.

When all the nails in the magazine 13 are driven and the magazine 13 is emptied, the third blanking prevention member 33
Is rotated by the urging force of the spring 35 so as to enter the nail loading portion of the magazine 13 deeply, and the third idle prevention member 3
3 is retracted from a position below the lower end 31b of the second idling prevention member 31. As a result, the second idle hit prevention member 31 can move downward, and the second idle hit prevention member 28 is moved by the pulling operation of the trigger lever 16 toward the free end side of the first idle hit prevention member 28. The first emptying prevention member 2
8, the operation of the trigger valve stem 27 is invalidated and the nailing machine is not started.

[Brief description of the drawings]

FIG. 1 is a side view of a nail driving machine in which an idle driving prevention mechanism according to the present invention is implemented.

FIG. 2 is a perspective view showing a main part of an idle driving prevention mechanism of the same nail driving machine as FIG.

FIG. 3 is a longitudinal sectional view taken along line AA in FIG. 1;

FIG. 4 is a longitudinal sectional side view showing a state in which nails remain in a magazine of the same idle hit prevention mechanism as in FIG. 1;

FIG. 5 is a longitudinal side view of the same magazine as FIG. 4 with no nails in the magazine;

FIG. 6 is a perspective view showing a main part of an idle hit prevention mechanism according to a second embodiment of the present invention in a partially sectional view.

FIG. 7 is a longitudinal rear view of the magazine of the embodiment of FIG. 6 with nails remaining in the magazine.

8 is a longitudinal rear view of the same magazine as that of FIG. 7 with no nails in the magazine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Nailer 11 Grip part 12 Housing 13 Magazine 14 Nose part 15 Plug 16 Trigger lever 20 Idling prevention mechanism 21 Wear plate 22 Magazine main body 23 Slider 24 Pusher 24a Projection 25 3rd Idling prevention member 25a Front end 25b Rear End 26 Spring 27 Trigger valve stem 28 First idle hit prevention member 29 Second idle hit prevention member 29a Upper end 29b Lower end 30 Spring 31 Second idle hit prevention member 32 Opening 33 Third empty Hammering prevention member 34 Axis 35 Spring

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takao Tsukada 6-6, Hakozaki-cho, Nihonbashi, Chuo-ku, Tokyo F-term (reference) in Max Corporation 3C068 AA02 AA07 BB01 DD18 HH17

Claims (2)

[Claims] A magazine accommodating a connecting nail to which a number of nails are connected; and a slidably disposed nail in the magazine for engaging with a last nail in the magazine to press the connecting nail forward. A pusher for supplying the injection port formed in the nose part one after another,
A driving means for driving a driver by the power of compressed air or the like to drive the nail in the injection port from the injection port by the driver, and a nail driving machine including a manually operable trigger lever for activating the driving means; A first member for activating the driving means is rotatably disposed on the trigger lever by pivotally supporting a base end thereof, and an upper end is disposed near a free end of the first member, and Slidable second member movable between a first position supporting the free end of the first member upward and a second position not supporting the free end of the first member upward. And further disposed at a position facing the lower end of the second member, and movable along the nail supply direction of the magazine, and disposed below a lower end surface of the second member. Maintaining the second member in the first position; A third member which is moved from the initial position to the operating position by engaging with the pusher, wherein the third member is retracted from below the lower end surface of the second member in the operating position. An idle hit prevention mechanism in a nailing machine, wherein the second member is allowed to move to the second position. 2. A magazine accommodating a connecting nail to which a number of nails are connected, and a sliding nail disposed in the magazine to engage with a last nail in the magazine to press the connecting nail forward. A pusher for supplying the injection port formed in the nose part one after another,
A driving means for driving a driver by the power of compressed air or the like to drive the nail in the injection port from the injection port by the driver, and a nail driving machine including a manually operable trigger lever for activating the driving means; A first member for activating the driving means is rotatably disposed on the trigger lever by pivotally supporting a base end thereof, and an upper end is disposed near a free end of the first member, and Slidable second member movable between a first position supporting the free end of the first member upward and a second position not supporting the free end of the first member upward. And a lower end of the second member is inserted into the magazine through an opening formed in the magazine and arranged therein, and a third member rotated by engaging with a nail in the magazine is arranged in the magazine. And the lower end of the second member is Idle driving prevention mechanism in the nailing machine is characterized in that is disposed third member opposed to.