JP4174727B2 - Nailer - Google Patents

Description

  The present invention relates to a nailing machine for driving nails using compressed air as a power source.

An example of a conventional nailing machine will be described with reference to FIGS.
Compressed air from a compressor (not shown) is stored in a pressure accumulating chamber 2 in the nailer body 1 via an air hose (not shown). A cylindrical cylinder 3 is provided in the nailing machine body 1, and a piston 4 is provided in the cylinder 3 so as to be slidable in the vertical direction. The piston 4 has a piston portion 4a and a driver blade portion 4b integrated. The nail 21 is driven by the tip portion 4c. The inner diameter of the cylinder 3 is larger than the outer diameter of the piston part 4a so that the piston part 4a can easily move up and down. A groove 28 is provided in the piston portion 4a, and a well-known O-ring 26 made of a flexible material such as rubber is provided to seal the inner periphery of the cylinder 3 and the piston portion 4a.

  A main valve 5 is provided at the upper end of the cylinder 3. The main valve 5 is opened when the upper end of the cylinder 3 is opened and the exhaust valve rubber 6 is closed, and the upper side of the piston 4 in the accumulator 2 and the cylinder 3 is closed. When the main valve 5 is lowered, the upper end of the cylinder 3 is closed and the exhaust valve rubber 6 is opened. The upper side of the piston 4 in the cylinder 3 is a three-way valve communicating with the atmosphere.

  A return air chamber 7 for returning the piston 4 from the bottom dead center to the top dead center is provided on the outer periphery of the lower end of the cylinder 3, and a check that communicates only from the cylinder 3 in the direction of the return air chamber 7 during the reciprocating stroke of the piston 4. An air passage 9 provided with a valve 8 is provided, and an air passage 10 communicating the cylinder 3 and the return air chamber 7 is provided on the outer periphery of the lower end of the cylinder 3. A piston bumper 11 that absorbs surplus energy of the driver blade 4b after driving the nail 21 is provided at the lower end of the cylinder 3. The lower side is larger than the inner diameter of the cylinder 3 so that the piston bumper 11 does not move to the top dead center side of the cylinder 3. The lower inner surface of the cylinder 3 has a tapered surface 3a that expands in the direction of the bottom dead center, which is substantially the same as the outer shape of the piston bumper 11.

  A plurality of protrusions 3b are provided on the outer periphery of the upper portion of the cylinder 3 so as to be engaged with the nailing machine body 1 so that the cylinder 3 does not move in the direction of the top dead center when the pressure of the return air chamber 7 is higher than that of the pressure accumulating chamber 2. ing. A plurality of protrusions 3b are provided intermittently in the vertical direction so that the compressed air flowing in from the handle flows to the main valve 5 side. The protrusion 3 b is connected to the body 14 via the separator 12 and the exhaust cover 13.

  The injection unit 15 includes a feeding mechanism 18 that sequentially feeds the nails 21 loaded in the magazine 16 to the injection port 17 in response to the reciprocation of the piston 4. The feeding mechanism 18 includes a tail cover 19 as a main component, and the tail cover 19 includes a guide hole 19a for guiding the driver blade portion 4b in the axial direction. The inner diameter of the guide hole 19a is slightly larger than the outer diameter of the driver blade portion 4b so that the driver blade portion 4b can easily move up and down.

  Next, a driving operation by the nailing machine having the above-described configuration will be described with reference to FIGS.

First, FIG. 6 shows a state where an air hose is connected to the nail driver main body 1 before driving.
The piston 4 is at the top dead center, and the piston portion 4 a is guided to the cylinder 3 via the O-ring 26. The driver blade portion 4b is guided in the guide hole 19a. Compressed air is stored in the pressure accumulation chamber 2.

  Next, FIGS. 7 and 8 show a state when the piston portion 4a moves to the bottom dead center in response to the operation of the trigger valve 20. FIG.

  When the trigger valve 20 is operated, the main valve 5 is opened, and compressed air flows from the pressure accumulating chamber 2 to the upper side of the piston 4 of the cylinder 3. The piston 4 drives the nail 21 while rapidly moving to the bottom dead center by the compressed air that has flowed in. The driving energy of the nail driver is set larger than the resistance of the wood so that the nail 21 can be driven even if the hardness of the wood slightly changes. Therefore, the normal piston 4 hits the nail 21 and then collides with the piston bumper 11. The piston bumper 11 is deformed and absorbs excess energy of the piston 4. The air below the piston 4 of the cylinder 3 and part of the compressed air above the piston 4 flows into the return air chamber 7 via the air passages 9 and 10.

  Next, when the trigger valve 20 is returned, the main valve 5 is closed and the upper side of the piston 4 in the cylinder 3 communicates with the atmosphere. The lower side of the piston 4 of the cylinder 3 is pressed by the compressed air accumulated in the return air chamber 7, and the piston 4 suddenly moves to the top dead center. The air above the piston 4 of the cylinder 3 is released to the atmosphere via the air passage 13a and returns to the initial state.

The problem to be solved by the present invention will be described with reference to FIGS.
The piston bumper 11 is deformed and absorbs surplus energy after the nail driving of the piston 4, but the axial direction is small, and the piston bumper 11 is largely deformed in the radial direction. When the piston bumper 11 is deformed, a part of the outer side of the piston bumper 11 comes into contact with the tapered surface 3 a inside the lower part of the cylinder 3, and a load 22 is generated in the direction of expanding the diameter of the cylinder 3. The load 22 generated at that time generates a component force 23 in the direction of the top dead center by the tapered surface 3 a inside the lower part of the cylinder 3. The component force 23 acts in the direction in which the cylinder 3 is lifted, but the cylinder 3 is connected to the nailing machine body 1 by the projection 3b, and therefore does not lift.

  Usually, since the nail is driven, the energy received by the piston bumper 11 is small, and the deformation amount of the piston bumper 11 is small. Especially, in the idle driving state in which the driving operation is performed without loading the nail, the energy for driving the nail is Since all are received by the piston bumper 11, the piston bumper 11 is greatly deformed, and the component force 23 for pushing up the cylinder 3 is also increased. In order to counteract the component force 23, the strength of the separator 12, the exhaust cover 13, and the body 14 connected to the protrusion 3b and the protrusion 3b must be improved, and the material cost, the processing cost increase, the mass increase, There was a problem that the volume of the pressure accumulating chamber 2 was reduced.

  Of course, the nailing machine body receives acceleration in the driving direction due to the impact of the piston 4 colliding with the piston bumper 11 during driving, whereas the cylinder 3 cannot be attached to the main body and is relatively left behind. Causes a known phenomenon that the cylinder 3 rises.

  An object of the present invention is to provide a nailing machine that eliminates the above-mentioned drawbacks of the prior art, reduces material costs, processing costs, mass, and secures the volume of a pressure accumulating chamber.

In order to achieve the above object, the present invention includes a cylindrical cylinder provided in a nailing machine body, a piston slidably provided in the cylinder, and an integrally connected piston. In a nailing machine including a driver blade portion and a piston bumper provided at a lower end portion of the cylinder, a plurality of projecting portions extending in a radial direction of the cylinder are intermittently provided along an outer periphery of the cylinder. And providing a locking member for locking the projection on the nailing machine main body side, and arranging a ring-shaped buffer between the plurality of projections and the locking member, One feature is that a ring-shaped metal washer is provided between the plurality of protrusions .

  According to the present invention, it is not necessary to make the protrusion, the separator connected to the protrusion, the exhaust cover, and the body highly rigid, the material cost, the processing cost, and the mass can be reduced, and the volume of the pressure accumulating chamber can be secured.

  1 and 2 show an embodiment of the nailing machine of the present invention.

  Compressed air from a compressor (not shown) is stored in a pressure accumulating chamber 2 in the nailer body 1 via an air hose (not shown). A cylindrical cylinder 3 is provided in the nailing machine body 1, and a piston 4 is provided in the cylinder 3 so as to be slidable up and down. The piston 4 includes a piston portion 4 a and a driver blade portion 4 b, and The nail 21 is driven by the tip portion 4c. The inner diameter of the cylinder 3 is larger than the outer diameter of the piston part 4a so that the piston part 4a can easily move up and down. The piston portion 4a is provided with a groove 28, and includes an O-ring 26 made of a flexible material such as rubber in order to seal the inner periphery of the cylinder 3 and the piston portion 4a.

  A main valve 5 is provided at the upper end of the cylinder 3. The main valve 5 is opened at the upper end of the cylinder 3 when the main valve 5 is raised, and the exhaust valve rubber 6 is closed. When the main valve 5 is lowered, the upper end of the cylinder 3 is closed, the exhaust valve rubber 6 is opened, and the upper side of the piston 4 in the cylinder 3 is a three-way valve communicating with the atmosphere.

  A return chamber 7 for returning the piston 4 from the bottom dead center to the top dead center is provided on the outer periphery of the lower end of the cylinder 3, and a check valve 8 communicating only from the cylinder 3 to the return chamber 7 is provided in the middle of the reciprocating stroke of the piston 4. The provided air passage 9 is provided, and an air passage 10 that communicates the cylinder 3 and the return chamber 7 is provided on the outer periphery of the lower end of the cylinder 3. A piston bumper 11 that absorbs surplus energy of the driver blade after driving the nail 21 is provided at the lower end of the cylinder 3. The lower side of the piston bumper 11 is larger than the inner diameter of the cylinder 3 so as not to move to the top dead center side of the cylinder 3. The lower inner surface of the cylinder 3 includes a tapered surface 3a that expands toward the bottom dead center side, which is substantially the same as the outer shape of the piston bumper 11.

  A plurality of protrusions 3b that extend intermittently outward in the radial direction to be engaged with the nailing machine body 1 are provided on the outer periphery of the upper portion of the cylinder 3 so that the cylinder 3 does not move in the direction of the top dead center. The body 14 is connected to the body 14 of the nailing machine body 1 through a ring-shaped buffer 24, a continuous ring-shaped washer 25, a separator 12, and an exhaust cover 13. In the present embodiment, the buffer body 24 is formed of rubber in a cylindrical shape, and the washer 25 is provided between the projection 3b of the cylinder 3 and the buffer body 24, and intermittently applies the load 22 toward the top dead center of the cylinder 3. It is made of metal so as not to be deformed into a corrugated shape even if it is pushed by a typical projection 3b. In order to prevent the shock absorber 24 from being deformed too much and protruding or damaged when the shock absorber 24 is deformed, an appropriate deformation allowance space 27 is provided and the inside is a part of the intermittent projection 3b, and the outside is the body 14 It is regulated by a wall.

  The injection unit 15 includes a feeding mechanism 18 that sequentially feeds the nails 21 loaded in the magazine 16 to the injection port 17 in response to the reciprocation of the piston 4. The feeding mechanism 18 includes a tail cover 19 as a main component, and the tail cover 19 includes a guide hole 19a for guiding the driver blade portion 4b in the axial direction. The inner diameter of the guide hole 19a is slightly larger than the outer diameter of the driver blade portion 4b so that the driver blade portion 4b can easily move up and down.

Next, a driving operation by the nailing machine having the above configuration will be described with reference to FIGS.
FIG. 1 shows a state in which an air hose is connected to a nail driver main body 1 before driving. The piston 4 is at the top dead center, and the piston portion 4 a is guided to the cylinder 3 via the O-ring 26. The driver blade portion 4b is guided in the guide hole 19a. Compressed air is stored in the pressure accumulation chamber 2.

2 and 3 show a state when the piston portion 4a moves to the bottom dead center in response to the operation of the trigger valve 20. FIG.
When the trigger valve 20 is operated, the main valve 5 is opened, and compressed air flows from the pressure accumulating chamber 2 to the upper side of the piston 4 of the cylinder 3. The piston 4 drives the nail while moving rapidly to the bottom dead center by the compressed air that has flowed in. The driving energy of the nail driver is set large so that the nail can be driven even if the hardness of the wood changes slightly. Therefore, the normal piston 4 collides with the piston bumper 11 after driving a nail. The piston bumper 11 is deformed and absorbs excess energy of the piston 4. The air below the piston 4 of the cylinder 3 and part of the compressed air above the piston 4 flows into the return chamber 7 through the air passages 9 and 10. The piston bumper 11 is small in the axial direction and large and deforms in the radial direction. When the piston bumper 11 is deformed, a load 22 is generated in a direction of increasing the diameter of the cylinder 3 by contacting the tapered surface 3a inside the lower portion of the cylinder 3. The generated load 22 transmits a component force 23 in the direction of the top dead center by the tapered surface 3a inside the lower part of the cylinder 3. The component force 23 acts in the direction in which the cylinder 3 is lifted, but the buffer body 24 of the present invention provided between the protrusion 3b on the outer periphery of the cylinder 3 and the exhaust cover 13 deforms and cushions to absorb the component force 23. The plurality of protrusions 3b of the cylinder 3 are intermittently provided so that compressed air can pass through them. However, since the metallic washers 25 are interposed, the buffer body 24 can receive the load 22 evenly over the entire contact surface. In addition, since the fine gap 27 and the wall for restricting deformation of the buffer body 24 are provided on the outer diameter side of the buffer body 24, the entire buffer body 24 is not deformed more than the set deformation, and it protrudes or breaks. It is supposed not to.

  Next, when the trigger valve 20 is returned, the main valve 5 is closed and the upper side of the piston 4 in the cylinder 3 communicates with the atmosphere. The lower side of the piston 4 of the cylinder 3 is pressed by the compressed air accumulated in the return chamber 7, and the piston 4 suddenly moves to the top dead center. The air above the piston 4 of the cylinder 3 is released to the atmosphere via the air passage 13a and returns to the initial state.

The side surface partial cross section figure of the piston top dead center which shows one Embodiment of this invention nailing machine. The side surface partial cross section figure of the piston bottom dead center which shows one Embodiment of this invention nailing machine. The side surface partial sectional view which shows the load and component force which a piston bumper exerts on a cylinder at the time of piston bottom dead center of this invention nailing machine. Section AA of FIG. Side surface partial sectional drawing of the piston top dead center which shows other embodiment of this invention nailing machine. The side surface partial sectional view of the piston top dead center which shows an example of the conventional nailing machine. Side surface partial sectional drawing of the piston bottom dead center which shows an example of the conventional nailer. The side surface partial sectional view which shows the load and component force which a piston bumper exerts on a cylinder at the time of piston bottom dead center of the conventional nailer.

Explanation of symbols

1 is a nailing machine body, 2 is a pressure accumulating chamber, 3 is a cylinder, 3a is a tapered surface, 3b is a protrusion, 4 is a piston, 11 is a piston bumper, 12 is a separator, 13 is an exhaust cover, 14 is a body, 24 is A buffer, 25 is a washer, and 27 is a gap.

Claims (1)

A cylindrical cylinder provided in the nailing machine body, a piston slidably provided in the cylinder, a driver blade portion integrally connected to the piston, and a lower end portion of the cylinder And a plurality of protrusions extending in the radial direction of the cylinder intermittently along the outer periphery of the cylinder, and the protrusions on the nailing machine main body side. A locking member for locking the portion is provided, a ring-shaped buffer is disposed between the plurality of protrusions and the locking member, and a ring-shaped buffer is disposed between the buffer and the plurality of protrusions. A nailer characterized by a metal washer .

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