JPH0325306B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a nailing machine that is capable of continuously driving nails, and in particular, by configuring the stroke of a driver support shaft to be variable according to the length of the nail. , the stroke of the driver can be adjusted arbitrarily,
This invention relates to a nailing machine that enables efficient nail driving work.

[Conventional technology]

Conventionally, a so-called nail belt for a nail gun, in which a large number of nails are arranged on a wire or a band-like object at the required intervals, is set on the nose of the nail gun and used to continuously drive nails into the required locations. Nailers with configurations that allow this are known.

This kind of general nailing machine uses compressed air as a driving source to slide a piston placed in a cylinder, which applies a striking force to the driver and a pressing force. The driver is configured to drive nails that are continuously supplied to the tip of the driver through the nose and into a desired object.

[Problem that the invention seeks to solve]

Such conventional nailing machines have the following problems.

In other words, the objects into which nails are driven vary widely, from thick to extremely thin, and nails of various lengths and shorts are used depending on the thickness of the object. be done.

However, the sliding stroke of the piston in a conventional nail gun is not variable but always constant, and the driving stroke of the driver integrated with the piston is also constant. Therefore, if the nail to be driven is short, the nail may be driven deeper than the surface of the object, and the head of the nail may be driven deeper into the surface of the object.

On the other hand, if the nail is long, only the tip can be driven into the object, and the head of the nail will protrude from the surface of the object. In any case, it is a difficult task to drive nails of different lengths using the same nail gun so that the heads of the nails are approximately inserted into the surface of the object.

The present invention provides a nailing machine that solves the above problems.

[Means for solving problems]

The nailing machine according to the present invention is provided with a cylinder built into the case body, and the base end of a driver slidably inserted into the cylinder is struck by a piston, and the nail driver is supplied to the nose provided at the tip of the case body. In a nailing machine that strikes a nail with the tip of the driver, a first cylinder member and a second cylinder are formed by making the cylinders face each other with their openings facing each other and screwing threaded portions formed on the respective cylinder walls. The first cylinder member is fixed to the case body, and the case body is configured such that the piston contact surface of the inner circumferential cylindrical portion integrally provided with the second cylinder member is movable in the axial direction of the piston. The second cylinder member is rotatably operated from the outside, and a driver is provided movably through the center of the second cylinder member so that its base end can come into contact with the piston. The proximal end applies a force to enter the cylinder, and the piston is further provided with an air passage that communicates the upper chamber and the lower chamber of the piston, and the air passage is provided with an air passage that contacts the piston contact surface when the piston is lowered. It is characterized by a configuration in which a ball valve is operated by a contacting ball valve operating shaft.

[Effect]

The piston moves back and forth by supplying compressed air into the first cylinder member, and the piston applies a striking force to the driver support shaft, and furthermore, the compressed air supplied through the passage formed in the piston causes the piston to move back and forth. A pressing force is applied to the driver, and the tip of the nail at the tip of the driver can be driven into the object.

At this time, by movably adjusting the screwing position of the second cylinder member relative to the first cylinder member in advance, the position of the collision surface of the piston of the second cylinder member, which is the forward end of the piston, is set. I'll keep it.

Thereby, the driving protrusion length of the driver driven by the piston is adjusted according to the length of the nail to be used, and the tip of the nail is driven into the object by the required amount according to the length of the nail. I can do it.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a longitudinal sectional view at the start of the nail driving operation, Fig. 2 is a longitudinal sectional view immediately after the start of the nail driving operation, and Fig. 3 is the longitudinal sectional view at the end of the nail driving operation. FIG.

In the figure, 1 is a case body, 2 is a grip that communicates with the inside of this case body 1 via a communication portion 3, and an air chamber 4 is formed inside the grip.

A cylinder 7 consisting of a first cylinder member 5 and a second cylinder member 6 is housed inside the case body 1 . A piston 8 is inserted into the first cylinder member 5 in an airtight and slidable manner. 9 is a driver support shaft, and the driver 1 can be freely attached and detached by screwing onto the tip of this shaft.
0 is attached. Further, the shape of the driver 10, particularly the cross section of the tip portion, can be configured into any shape such as a square or a circle.

Reference numeral 11 denotes a head block provided at the upper part of the case body 1, and a driving valve body 12 is provided between this head block and the upper end of the first cylinder member 5. Furthermore, an air pipe 14 and a trigger valve 15 connected thereto are arranged between the head valve 13 provided on the head block 11 and the air chamber 4.

The head valve 13 includes a head valve cylinder 17 formed by a combination of a head block 11 of the case body 1 and a piston stopper 16 provided inside the head block 11, and a head valve cylinder 17 that is slidably and tightly fitted into the head valve cylinder 17. The driving valve body 1
It is composed of 2.

The upper end of the air pipe 14 is connected to the inside of the head valve cylinder 17, and when the trigger valve 15 is not operated, the air inside the air chamber 4 is guided to the upper chamber 18 of the head valve cylinder 17 through the air pipe 14. The drive valve body 12 is moved down.

That is, the area of the upper pressure receiving part 19 of the driving valve body 12 is the same as that of the lower end of the head valve cylinder 17 and the first cylinder member 5.
Lower pressure receiving part 21 formed between upper end part 20 of
It is formed larger than the area of . Therefore, the air pressure from the air chamber 4 is applied to the upper pressure receiving part 19 to a greater extent than to the lower pressure receiving part 21 of the driving valve body 12, pushing the driving valve body 12 downward.

At this time, the lower end of the driving valve body 12 is in airtight contact with the upper end surface of the first cylinder member 5 (specifically, the packing member 22 provided on this upper end surface),
Further, since the driving valve body 12 and the head valve cylinder 17 are in close contact with each other, the piston upper chamber 23 in the first cylinder member 5 and the air chamber 4 are isolated from each other, and no air pressure is applied to the piston 8.

At this time, the lower end of the buffer spring 24 attached to the piston stopper 16 is in contact with the drive valve body 12, and works together with the upper pressure receiving part 19 of the drive valve body 12 to assist in pushing down the drive valve body 12. When the piston 8 returns, its protrusion 8a
passes through the lower opening 25 of the driving valve body 12 and is received by the piston stopper 16.

The trigger valve 15 for actuating the head valve 13 is comprised of a casing 26 provided in the grip portion 2 and an operating rod 27 slidably built into the casing 26.

That is, the air passage 2 provided in the casing 26
8 is in communication with the air pipe 14, and the other end is bifurcated into a first branch passage 29.
communicates with the air chamber 4 and is connected to the second branch passage 30.
communicates with the atmosphere.

Further, when the operating rod 27 is not operated, it is pushed downward via a coil spring 33 built in its small diameter portion 31 and a convex portion 32 provided on the casing 26 .

In this way, when the operating rod 27 is not operated,
It is pushed downward, and closes the second branch passage 30 communicating with the atmosphere at its outer peripheral portion, while opening the second branch passage 30 communicating with the air chamber 4 through the small diameter portion 31 so as to communicate with the air passage 28. There is.

When the operating rod 27 is pressed against the coil spring 33, this passage is switched and the air passage 28 and the second branch passage 30 are cut off.

Therefore, if you press the operation rod 27 now,
The upper chamber 18 of the head valve cylinder 17 becomes atmospheric pressure via the trigger valve 15 and the air pipe 14, and air pressure is not applied to the upper pressure receiving surface 19 of the drive valve body 12, but only to the lower pressure receiving surface 21. Therefore, the drive valve body 12 is lifted up.

Therefore, the space between the lower pressure receiving surface 21 of the drive valve body 12 and the upper end of the first cylinder member 5 is opened, and the air chamber 4 and the piston upper chamber 23 of the first cylinder member 5 are opened.
This communicates with the piston 8 and pushes the piston 8 down rapidly.

In FIG. 1, when the drive valve body 12 is down, the piston 8 is lifted upward.

Further, the drive valve body 12 has an exhaust hole 34, and when the drive valve body 12 is moving downward, the exhaust hole 34
An exhaust passage 35 communicating with the head block 11
When the piston 8 moves upward, the first
The air in the upper chamber 23 of the cylinder member 5 is driven by the valve body 12.
The air is exhausted to the outside through a lower end opening 25, an exhaust hole 34, and an exhaust passage 35.

Next, a related structure between the first cylinder member 5 and the second cylinder member 6 will be explained.

An annular protrusion 36 is provided on the outer circumference of the cylindrical portion of the first cylinder member 5, and this annular protrusion is engaged with the upper surface of an annular engagement portion 37 provided on the inner circumference of the case body 1, They are airtightly fixed via a ring 38. Further, a male thread 39 is formed on the outer periphery of the thick lower portion of the first cylinder member 5.

On the other hand, the second cylinder member 6 has an inner circumferential cylinder part 40 and an outer circumferential cylinder part 41, as shown in the figure, and both are movably integrally formed at a lower end connecting part 42. That is, a female thread 43 is formed on the inner periphery of the outer cylindrical part 41, and the lower part of the first cylinder member 5 is connected to the gap 44 between the inner cylindrical part 40 of the second cylinder member 6 and the outer cylindrical part 41. The male screw 39 and the female screw 43 are screwed together so that they can move forward and backward.

The outer cylindrical portion 41 is brought into close contact with the inner circumferential surface of the case body 1 via an O-ring 45, and the piston 8 is slidably inserted into the first cylinder member 5 on the upper end surface of the inner cylindrical portion 40. The contact surface 46 that the lower end touches
is provided.

Furthermore, the lower end of the outer circumferential cylinder part 41 of the second cylinder member 6 has a rotation operation part 66 for finger hooking, and a part of this rotation operation part 66 is formed in a part of the cylinder wall of the case body 1. It is located in the opening 60.

Therefore, by rotating the rotary operation part 66 in the opening 60, the female thread 43 provided on the outer circumferential cylinder part 41 is rotated along the fixedly provided male thread 39 of the first cylinder member 5. The second cylinder member 6 as a whole moves up and down within the range provided with the female thread 43, and the position of the piston contact surface 46 of the inner circumferential cylinder portion 40 against which the piston 8 collides can be moved up and down. , This allows the forward stroke of the piston 8 to be freely changed.

That is, the second cylinder member 6 is movably screwed to the first cylinder member 5 within the range where the female screw 43 is provided. Inside the second cylinder 6, a driver support shaft 9 is attached to the cylindrical body 4.
7 in an airtight and slidable manner,
The upper end of the support shaft 9 is brought into contact with the lower surface of the piston 8.

Further, a plurality of communication holes 48 are formed in the lower part of the first cylinder member 5, and a piston lower cavity 49 and a cavity formed between the first cylinder member 5 and the case body 1. 50 through this communication hole 48.

Furthermore, a plurality of communication holes 51 are also formed in the upper part of the first cylinder member 5.
An elastic ring 52 that can be freely opened and closed is fitted around the outer periphery of the first cylinder member 5.

The opening position of the communication hole 51 is higher than the upper end surface of the piston 8 when the piston 8 is set at the maximum stroke and is located at the forward end. When the piston upper chamber 23 of the first cylinder member 5 is filled with compressed air in order to move the piston 8 back and forth, a part of this compressed air pushes the elastic ring 52 that closes the communication hole 51. It is expanded to open this communication hole 51 and enter the cavity 50, and then pass through the lower communication hole 48 and enter the piston lower cavity 50 and the piston lower chamber 53 which is the inside of the second cylinder member 6.

Note that at this time, the air pressure that presses the top surface of the piston 8 is greater than the air pressure that presses the bottom surface of the piston 8.

The piston 8 is formed with an air passage 54 that communicates the piston upper chamber 23 and the piston lower chamber 53. During movement, compressed air is prevented from flowing from the piston upper chamber 23 into the piston lower chamber 53. moreover,
The operating shaft 58 is inserted into the shaft hole 57 formed in communication with the air passage 54, the upper end of the operating shaft 58 is brought into contact with the ball valve 56, the lower end is slightly protruded from the lower end surface of the piston 8, and the second It is configured so that it can be locked onto the piston contact surface 46 of the cylinder member 6.

Therefore, when the piston 8 hits the piston contact surface 46, the actuating shaft 58 is lifted,
Push up the ball valve 56 to open the air passage 54,
The compressed air in the piston upper chamber 23 is transferred to the piston lower chamber 53.
supplied to

Since the driver support shaft 9 passes through the cylindrical body 47 in an airtight and slidable manner, the pressure receiving surface 67 at the upper end of the driver support shaft 9 receives the pressure of the compressed air in the piston lower chamber 53. , which provides thrust.

59 is an end plate that closes the lower side of the opening 60 at the bottom of the case body 1; 70 is a guide case that has a cylindrical part 71 attached to the lower part of the end plate 59; 62 is a guide case that is attached to the cylindrical part 71; It's the nose. The driver 10, which is detachably attached to the driver support shaft 9, is inserted into the nose 62 through the shaft hole 61 provided in the end plate 59 and the cylindrical portion 71 of the guide case 70, and is moved forward and backward into the nose 62. There is.

Further, the driver 10 needs to be retreated into the cylinder after driving the nail. Therefore, it is preferable to use any means to apply a force to the driver 10 in a direction that causes the driver to retreat into the cylinder.
As an example, in the illustrated example, a coil spring 72 is disposed inside the guide case 70, and the driver 1 is placed inside the coil spring 72.
0 through the coil spring 72 and locking the upper end of the coil spring 72 to the driver 10.
The elastic force of 2 is used to provide a force for retracting the driver 10 into the cylinder.

A nail supply port 63 is provided in the peripheral portion of the nose 62.
is opened, and a magazine 64 is attached to it. Further, a large number of nails 65, 65, .

Therefore, according to this embodiment, when the operating rod 27 of the trigger valve 15 is operated, compressed air is supplied to the piston upper chamber 23 as shown in FIGS. 1 and 2, the piston 8 is lowered, and the driver support shaft is By hitting the upper end surface of the nail 65, that is, the pressure receiving surface 67, the driver 10 is applied with a striking force, and the nail 65
The target object 6 is sequentially moved in response to the downward movement of the driver 10.
8.

At this time, since the height position of the piston contact surface 46 of the second cylinder member 6 can be accurately set according to the length of the nail 65 as described above, the tip of the nail 65 can be adjusted by the required amount. Make sure that the target object 68
is driven into. Note that this piston contact surface 46 is provided with a necessary packing material 69.

When the piston 8 hits the piston contact surface 46 as shown in the third figure, the actuating shaft 58 is actuated.
The ball valve 56 opens the air passage 54, and the compressed air in the piston upper chamber 23 enters the piston lower chamber 53, and the compressed air pressure receiving surface 67 of the driver support shaft 9 enters the piston lower chamber 53.
By pressing , thrust is applied to the driver 10. Then, by moving the driver 10 downward, the nail 65 can be driven into the object 68 by a preset required amount.

In this way, the nails 65 continuously supplied from the magazine 64 can be continuously driven into the object 68 by the driver 10. Further, after the driving is completed, the driver 10 is raised by the elastic force of the spring 72.

〔Effect of the invention〕

As described above, the screwing position of the first cylinder member and the second cylinder member is set in advance according to the length of the nail used, and the height of the piston contact surface of one cylinder member is adjusted. By adjusting this, the stroke of the piston can be changed to accurately drive the desired nail into the object. Moreover, there is an advantage that the screwing position can be easily set using the rotary operation section. In this way, the present invention allows the driving to be adjusted to suit various lengths of nails by varying the forward stroke of the driver, and unlike conventional methods, a driving depth adjustment device is attached as a separate member to the tip of the nose. This eliminates the need for the nail gun to be bulky at the tip of the nail gun, and allows it to be driven smoothly into recesses in corrugated plates and the like.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional view at the start of the nail driving operation of the present invention, FIG. 2 is a longitudinal sectional view immediately after the start, and FIG. 3 is a longitudinal sectional view after the nail driving operation is completed. It is. 1... Case body, 5... First cylinder member,
6... Second cylinder member, 7... Cylinder, 8...
...Piston, 9...Driver support shaft, 10...
Driver, 62...nose.

Claims (1)

[Scope of Claims] 1. A case body is provided with a cylinder containing a piston operated by compressed air, and the base end of a screwdriver slidably inserted into this cylinder is struck by the piston. In the nailing machine, in which the nails supplied to the nose are struck with the tip of the driver, the cylinders are formed by screwing threaded parts formed on the respective cylinder walls with the opening sides facing each other. Consisting of a first cylinder member and a second cylinder member, the first cylinder member is fixed to the case body, and the piston contact surface of the inner circumferential cylinder part provided integrally with the second cylinder member is aligned with the axis of the piston. The second cylinder member is configured to be rotatable and operable from the outside of the case body so as to be movable in the direction,
A driver is provided movably through the center of the cylinder member so that its base end can abut against the piston, the driver's base end applies a force to enter the cylinder, and the piston , a nail characterized in that an air passage communicating between an upper chamber and a lower chamber of the piston is provided, and this air passage is provided with a ball valve operated by a ball valve operating shaft that comes into contact with the piston contact surface when the piston descends. Hitting machine.