JPS6240773Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a type of nailing machine that drives nails using a piston that is energized by compressed air and moves back and forth.

Conventionally, there has been a type of nailer that reduces back pressure in order to increase the efficiency of the nailer.
Both had the disadvantage of complicated structures, such as the need to provide a separate valve.

An object of the present invention is to provide a nailing machine that is simple in structure and eliminates backpressure.

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, 1 is a hollow handle provided at the upper end of the nailer main body H, into which compressed air is supplied. A housing 3 housing a nail driving mechanism is connected to the front end of the supply chamber 2, and a valve mechanism 4 is installed in the vicinity of the front end of the housing 3.

Reference numeral 5 denotes a valve case of the valve mechanism 4, which is formed into a cylindrical shape and communicates with the communication passage 6 via a valve seat 5a at its lower end.

Reference numeral 7 denotes a ball valve that is movably fitted in the valve case 5, and is normally in contact with a seal ring 8 attached to the valve seat 5a of the valve case 5, so that the compressed air in the supply chamber 2 The valve seat 5a can be closed by pressing against the valve seat 5a.

Reference numeral 9 denotes a valve stem that is slidably disposed opposite to the lower part of the valve case 5, is pivotably mounted on the rear side of the housing 3 about a guide pin 11 as a fulcrum, and has an exhaust hole 10 extending therethrough. The trigger 12 is opposed to the idler 13 of the trigger 12 so as to be able to come into contact with and separate from it, and when pushed by the idler 13, the ball valve 7 is moved upward and the valve seat 5a of the valve case 5 is moved.
will be released.

14 is a bottom cap attached to the lower end of the housing 3, and a driver guide 14a is protruded from the tip thereof.

15 is an upper cap attached to the upper end of the housing 3; 16 is a disk-shaped head valve attached to the inner center of the upper cap 15;
It projects slightly downward into the housing 3.

A cylindrical cylinder 17 is vertically installed in the housing 3, and is loosely fitted into the housing 3 via a flange 17a that protrudes circumferentially near the top of the cylinder. A return air chamber 18 is formed between the lower housing 3 and the cylinder 17, and a first ventilation hole 17b and a second ventilation hole 17c are formed at the lower end of the cylinder 17.
are installed through each.

A main piston 19 is tightly fitted into the cylinder 17 so as to be able to move up and down. In order to buffer the impact of the main piston 19 that has reached the lower moving end against the inner lower end of the cylinder chamber 17B, a buffer ring 20 is fitted into the lower surface of the main piston 19 so as to be in close contact with the inner lower end of the cylinder chamber 17B.
is formed.

Reference numeral 21 is a valve cushion fitted to the head valve 16, and 22 is a main valve installed so as to be movable up and down between the outer surface of the upper end of the cylinder 17 and the inner surface of the housing 3. The through hole 23 is provided through the upper end portion 22a.
The head valve 16 is removably fitted on the outside in order to communicate and cut off the pressurizing chamber 25, which is always in communication with the supply chamber 2, and the upper cylinder chamber 17A above the head valve 16, and is fitted inside the upper end of the housing 3. The lower end 22b of the main valve 22 is slidably fitted into the provided support piece 26.
A variable pressure chamber 27 communicating with the communication passage 6 is formed between the flange 17a of the cylinder 17 and a third passage provided through the housing 3 between the main valve 22 and the support piece 26. An external pressure chamber 29 is formed which communicates with the outside air through the air hole 28 . When the valve mechanism 4 is opened, the main valve 22 is moved upward by the compressed air flowing into the variable pressure chamber 27 from the supply chamber 2 through the communication path 6, and the upper end portion 22a opens the head valve 16, and the pressurized chamber 2
5 flows into the upper cylinder chamber 17A, and the main piston 19 is moved downward. Near the end of the downward movement of the main piston 19, the upper cylinder chamber 17A
The compressed air inside is passed through the first ventilation hole 1 at the lower end of the cylinder 17.
7b into the return air chamber 18, and when the valve mechanism 4 is closed, the compressed air in the variable pressure chamber 27 is discharged into the atmosphere through the communication passage 6 and the exhaust hole 10a. 22 is moved downward by the pressure applied to the upper end surface 22c of the cylinder 22, and the upper cylinder chamber 17A is isolated from the pressurizing chamber 25 and communicated with the outside air, while the compressed air in the return air chamber 18 flows into the lower cylinder chamber 17B. Then, the main piston 19 is moved upward.

Reference numeral 30 denotes a round rod-shaped driver attached downward to the axial center of the main piston 19, the lower end of which extends into the driving path 31 passing through the driver guide 14a, main piston 1
The nail in the driving path 31 can be driven downward by the advance movement of step 9.

Reference numeral 32 denotes a nail feeding device disposed opposite to the driver guide 14a to feed nails supplied from a magazine disposed below the housing 3 into the driving path 31 in synchronization with the forward and backward movement of the main piston 19. The nail feeding cylinder 35 is provided with a nail feeding chamber 34 and a nail feeding cylinder 35 arranged in parallel with the nail feeding chamber 34. A feeding claw 37 that moves together with the piston rod 36a is swingably connected to the rear end of the piston rod 36a of the driven nail feeding piston 36, and extends into the nail feeding chamber 34. A nail K is hooked to the tip of the arm portion 37a of the feeding claw 37 to open the driving path 31.
A hooking portion 37b for feeding into the inside a is formed in a sawtooth shape.

39 is a check claw for holding the nail following nail K in the driving path 31 when the feeding claw 37 retreats; 40 is a torsion spring for biasing the feeding claw 37 clockwise; , 34a are the doors of the nail feeding chamber 34.

41 is an inner compartment formed at the rear of the nail feeding cylinder 35 divided by the nail feeding piston 36,
An exhaust port 42 is provided at the lower end of the exhaust port 42 so that the inner chamber 41 communicates with the outside air when the nail feeding piston 36 moves forward, and is closed by the nail feeding piston 36 when the nail feeding piston 36 retreats. An introduction pipe 43 is connected to the upper end for communicating the inner division chamber 41 and the buffer ring chamber 17C, and when the main piston 24 advances, the back pressure air in the lower cylinder chamber 17B flows through the introduction pipe 43. The air is introduced into the inner compartment 41 through the exhaust port 42 and exhausted into the outside air through the exhaust port 42.

Reference numeral 44 denotes an outer chamber formed in front of the nail feed cylinder 35, and a branch pipe line 45 for communicating the outer chamber 44 and the return air chamber 18 is connected to the tip thereof, and the main piston 19 reaches the lower moving end, the compressed air in the return air chamber 18, which is communicated with the upper cylinder chamber 17A through the first ventilation hole 17b, is introduced into the outer and inner chambers 44 through the branch pipe line 45, and is moved to the forward position. As the nail feeding piston 36 retreats, the exhaust port 42 is closed and the communication between the internal chamber 41 and the outside air is cut off, and compressed air flowing from the return air chamber 18 into the lower cylinder chamber 17B through the second ventilation hole 17c The main piston 19 is urged in the retracting direction by air.

Next, the operation and effects of the embodiment having the above configuration will be explained.

First, the valve mechanism 4 is opened to introduce the compressed air in the supply chamber 2 into the variable pressure chamber 27, and when the main valve 22 is moved upward, the head valve 16 is opened and the compressed air in the pressurizing chamber 25 is introduced into the upper cylinder. The nail rapidly flows into the chamber 17A, and the driver 30 moves forward together with the main piston 19, and the nail in the driving path 31 is driven into the nail driving surface.

At this time, as the main piston 19 moves forward, the air in the lower cylinder chamber 17B is removed from the buffer cylinder chamber 1.
The nail feeding cylinder 3 is inserted from inside 7C through the introduction pipe 43.
5 into the inner branch chamber 41, and the inner branch chamber 4
1 (see Fig. 3). Therefore, while the main piston 19 is moving, the inside of the lower cylinder chamber 17B is always maintained at the external pressure, and the main piston 19 is being moved. The main piston 19 can be smoothly and rapidly advanced by eliminating the backflash that suppresses it, and this has the effect of increasing the number of times the nail is driven per unit time and the driving force.

On the other hand, when the main piston 19 reaches the folded end where it comes into close contact with the buffer ring 21, the upper cylinder chamber 17
A enters the return air chamber 1 through the first ventilation hole 17b.
At the same time, the compressed air in the return air chamber 18 flows into the outer chamber 44 of the nail feed cylinder 35 through the branch pipe line 45, and as a result, the nail feed piston 36 retreats to the exhaust port of the inner chamber 41. 42 is occluded (see Figure 4).

Then, the valve mechanism 4 is closed and the main valve 22 is closed.
When the is moved downward, the upper cylinder chamber 17A becomes at external pressure, and the compressed air in the air return chamber 18 is introduced into the lower cylinder chamber 17B through the second vent hole 17c, and this compressed air is discharged from the exhaust port 42. With air leakage blocked by the nail feeding piston 36, air flows from the return air chamber 18 into the lower cylinder chamber 17B, and the main piston 19 is pressed by the compressed air that has flowed into the lower cylinder chamber 17B and moves upward. Return to the edge.

Near the retreating end of the main piston 19, as the pressure in the return air chamber 18 is reduced, the pressure in the outer chamber 44 is reduced, and the nail feeding piston 36 is moved forward under the force of the spring 38, and the lower cylinder chamber 17B is communicated with the outside air. The residual pressure when the main piston 19 retreats is exhausted.

Therefore, the upper and lower cylinder chambers 17 are moved by the nail feeding piston 36 which operates in synchronization with the nail driving operation of the main piston 19 and the nail feeding operation of the nail feeding device 32.
The air pressure inside A and 17B can be automatically regulated so as to be adapted to the biasing direction to the main piston 19, and the biasing force to the main piston 19 can be controlled to an appropriate state to repeat the nail driving operation. .

That is, in the present invention, a main piston fitted in a cylinder in a housing of a nailer main body is energized by compressed air flowing into an upper cylinder chamber formed above the main piston. While the main piston advances to drive out a nail in a driving path formed below, the main piston, which has advanced to the advancing end, releases the air from a return air chamber formed between the housing and the cylinder. The nail driver is configured to move backward by compressed air flowing into a lower cylinder chamber formed below the main piston, and the nail driver is configured to move backward by compressed air flowing into a lower cylinder chamber formed below the main piston. In order to send nails to the driving path, a nail feeding cylinder installed in parallel with the nail feeding chamber is formed into an inner division chamber and an outer division chamber by a nail feeding piston tightly fitted so as to be movable with respect to the nail feeding cylinder. In addition to dividing the
An introduction pipe communicating with the lower cylinder chamber is connected to the inner chamber in order to introduce back pressure air in the lower cylinder chamber into the inner chamber when the main piston advances; The inner division chamber has an exhaust port for discharging back pressure air introduced into the inner division chamber from the lower cylinder chamber into the outside air, and when the nail feeding piston moves forward, the exhaust port is opened and the nail feeding piston is opened. The exhaust port is arranged and penetrated so that it is closed by the nail feeding piston when the main piston moves back, and the outer compartment is provided with a gas in the return air chamber when the main piston moves toward the forward end. By connecting a branch pipe line communicating with the return air chamber to introduce compressed air into the outer division chamber and retract the nail feed piston, the air pressure in the upper and lower cylinder chambers is transferred to the nail feed cylinder. Optimized by the connected inlet pipe, branch pipe, and exhaust port that is opened and closed by the nail feed piston, it reliably eliminates back pressure during nail driving operation and unauthorized retraction movement of the main piston, and the nail driving operation is optimized. It has the effect of facilitating the

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a vertical cross-section showing the main parts of the nailing machine, FIG. 2 is an enlarged sectional view taken along the line X-X of FIG. The figure is an explanatory diagram of the operation of the main piston and the nail feeding piston. 3...Housing, 17...Cylinder, 17A...Upper cylinder chamber, 17B...Lower cylinder chamber, 18...Return air chamber, 19...Main piston, 31...Drive path, 34...Nail feeding chamber, 35...Nail feeding cylinder, 36 …
Nail feeding piston, 41...inner compartment, 42...exhaust port, 4
3, 45...pipeline, 44...external branch.

Claims (1)

[Scope of utility model registration request] A main piston fitted in a cylinder in the housing of the nailer main body is formed below the main piston by being urged by compressed air flowing into an upper cylinder chamber formed above the main piston. While the main piston moves forward to drive out the nail in the driving path, the main piston, which has moved to the advancing end, is positioned below the main piston from the return air chamber formed between the housing and the cylinder. The nail driving machine is configured to move backward by compressed air flowing into a lower cylinder chamber formed in The inside of the nail feeding cylinder arranged in parallel with the nail feeding chamber for sending the nail to the nail feeding chamber is partitioned into an inner chamber and an outer chamber by a nail feeding piston that is movably and tightly fitted into the nail feeding cylinder, and An introduction pipe communicating with the lower cylinder chamber is connected to the inner division chamber in order to introduce back pressure air in the lower cylinder chamber into the inner division chamber when the main piston advances. The branch chamber has an exhaust port for discharging back pressure air introduced from the lower cylinder chamber into the inner branch chamber to the outside air, and when the nail feed piston moves forward, the discharge port is opened and the nail feed piston When retracting, the exhaust port is arranged and penetrated so as to be closed by the nail feeding piston, and further,
The outer branch communicates with the return air chamber in order to introduce compressed air in the return air chamber into the outer branch and retract the nail feeding piston when the main piston moves near the advancing end. A nailing machine characterized by having a branch pipe connected thereto.