JP5245667B2 - Driving machine - Google Patents

Description

  The present invention relates to air consumption reduction of a driving machine for driving a stopper such as a nail or a staple.

  2. Description of the Related Art A driving machine is known in which a piston is driven by power such as compressed air and a stopper is driven into wood or the like. These driving machines are provided with a pressure accumulation chamber that stores compressed air, a cylinder that can communicate with the pressure accumulation chamber, and a head valve that controls communication between the pressure accumulation chamber and the cylinder. When the trigger of the driving machine is pulled, the head valve moves, and the accumulator and the cylinder are communicated. Then, the piston provided so as to be able to reciprocate in the cylinder descends, and the leading stopper sent to the injection portion is driven. Such a driving machine is already known as described in Patent Document 1.

JP2003-236768

  When driving a stopper in the driving machine described in Patent Document 1, the head valve is raised, and the pressure accumulating chamber and the cylinder communicate with each other. Then, when the compressed air in the pressure accumulating chamber flows into the cylinder, the piston is rapidly lowered to drive the stopper. Immediately after the stopper is driven, the piston is rapidly lowered, so that the pressure on the upper side of the piston is smaller than the pressure in the pressure accumulating chamber. Therefore, the compressed air in the pressure accumulation chamber flows into the cylinder until the pressure on the piston upper side in the cylinder is equal to the pressure in the pressure accumulation chamber. After driving the stop, that is, after the piston reaches bottom dead center, the compressed air flowing into the cylinder is discharged without any work.

  To achieve the above object, a housing, a pressure accumulating chamber for storing compressed air provided in the housing, a cylinder capable of communicating with the pressure accumulating chamber, a head valve for controlling communication between the pressure accumulating chamber and the cylinder, In the driving machine including the trigger for controlling the movement of the head valve, the cylinder has a moving means, and by pulling the trigger, the pressure by the compressed air acts on the moving means.

  According to the present invention, even after the stopper is driven, that is, after the piston reaches bottom dead center, the compressed air in the pressure accumulating chamber does not continue to flow in until the pressure in the cylinder and the pressure accumulating chamber becomes substantially equal. Therefore, it is possible to reduce the compressed air that is discharged without becoming the driving energy, and to reduce the air consumption.

  An example of a conventional driving machine will be described. For convenience of explanation, the upper direction in the drawing is defined as the upper direction and the lower direction in the drawing is defined as the lower direction. However, this definition does not limit the present invention.

  As shown in FIG. 5, in the driving machine, compressed air from an air compressor (not shown) is accumulated in the pressure accumulating chamber 1 in the driving machine 1 via an air hose (not shown). The driving machine is provided with a cylindrical cylinder 7 in which a piston 10 that reciprocates so as to be slidable up and down is disposed. A rubber bumper 16 is disposed below the cylinder 7. An injection portion 24 for driving a stopper is formed below the bumper 16.

  The pressure accumulating chamber 1 is connected to an air compressor (not shown) via an air hose and an air plug, and accumulates compressed air serving as power for the driving machine.

  The cylinder 7 accommodates the piston 10 so as to be slidable up and down. The piston 10 has substantially the same outer peripheral surface as the inner periphery of the cylinder 7, and has a seal member such as an O-ring on the outer periphery of the piston 10. Accordingly, the cylinder 7 is separated by the piston 10 into an upper chamber of the cylinder 7 and a lower chamber of the cylinder 7. The cylinder upper chamber can selectively communicate with the pressure accumulation chamber 1 and the atmosphere. A head valve 6 is provided at the upper part of the cylinder 7 and is urged downward by a spring.

  The bumper 16 is located at the lower end in the cylinder 7, and the upper surface thereof abuts when the piston 10 reaches the bottom dead center. Since the bumper 16 is an elastic body such as rubber, it is deformed and absorbs surplus energy of the piston 10.

  The injection part 24 is located at the lower end of the bumper 16 and forms an injection port 25 therein. The nail 11 stored in the magazine is sent to the injection unit 24 by a feeding member (not shown) that is biased in the direction of the injection port 25 by a spring. The injection port 25 also has a role of guiding the driver blade 26 integrated with the piston 10.

  Next, the operation of the conventional driving machine will be described. When an air hose (not shown) is connected, a part of the compressed air accumulated in the pressure accumulating chamber 1 flows into the control valve 3 through the air passage 2 and further flows into the head valve chamber 5 through the air passage 4. Flow into. The compressed air sent to the head valve chamber 5 further brings the head valve 6 and the cylinder 7 into close contact with each other and prevents the inflow of compressed air.

  When the trigger 8 is pulled, the plunger 9 in the control valve 3 is pushed up, and the compressed air in the head valve chamber 5 is discharged to the atmosphere via the air passage 4. When the compressed air in the head valve chamber 5 is exhausted, the head valve 6 is pushed up by the pressure of the compressed air in the pressure accumulating chamber 1, and the upper chamber of the cylinder 7 and the pressure accumulating chamber 1 are communicated. At the same time, the upper chamber of the cylinder 7 and the atmosphere are shut off, and the compressed air in the pressure accumulating chamber 1 flows into the upper chamber of the cylinder 7. The compressed air flowing into the upper chamber of the cylinder 7 moves the piston 10 rapidly to the bottom dead center and drives the nail 11. At this time, the air in the lower chamber of the cylinder 7 flows into the return air chamber 13 through the air passage 12. An air passage 15 provided with a check valve 14 that allows compressed air to flow only in the direction of the return air chamber 13 is provided on the side surface of the cylinder 7. Therefore, when the piston 10 is positioned below the air passage 15 provided in the cylinder 7, a part of the compressed air flowing into the upper chamber of the cylinder 7 flows into the return air chamber 13 through the air passage 15. The piston 10 lowered by the compressed air flowing in from the pressure accumulating chamber 1 contacts the bumper 16 at the bottom dead center. The bumper 16 absorbs excess energy of the piston 10 and deforms.

  When the trigger 8 is returned, the plunger 9 returns and compressed air flows into the control valve 3. Then, the compressed air flows into the head valve chamber 5 through the air passage 2 and the air passage 4. When the compressed air flows into the head valve chamber 5, the sleeve valve 6 is pushed down, and the pressure accumulating chamber 1 and the upper chamber of the cylinder 7 are shut off. The exhaust valve unit 17 communicates the upper chamber of the cylinder 7 with the atmosphere. The piston 10 is pressed from below by the compressed air accumulated in the return chamber air 13 and moves to the top dead center side. The air in the upper chamber side of the cylinder 7 is released to the atmosphere while being depressurized and silenced in the air passage 18 and the expansion chamber 19, and returns to the initial state. When this process is repeated, the connected nails 11 are sequentially driven.

  Next, an embodiment of a driving machine according to the present invention will be described with reference to FIGS. The members corresponding to those of the conventional driving machine are assigned common numbers.

  As shown in FIG. 1, in the driving machine according to the present invention, compressed air from an air compressor (not shown) is accumulated in a pressure accumulating chamber 1 in the driving machine via an air hose (not shown). The driving machine is provided with a cylindrical cylinder 7 provided with a moving means, and a piston 10 that reciprocates in a vertically slidable manner is disposed in the cylinder 7. Further, a head valve 6 that controls communication between the pressure accumulating chamber 1 and the cylinder 7 is provided.

  The pressure accumulating chamber 1 is connected to an air compressor (not shown) via an air hose and an air plug, and accumulates compressed air serving as power for the driving machine according to the present embodiment.

  The cylinder 7 accommodates the piston 10 so as to be slidable up and down. The piston 10 has substantially the same outer peripheral surface as the inner periphery of the cylinder 7, and has a piston ring 22 as a seal member on the outer periphery of the piston 10. Accordingly, the cylinder 7 is separated by the piston 10 into an upper chamber of the cylinder 7 and a lower chamber of the cylinder 7. A head valve 6 is positioned near the upper end of the cylinder 7, and the head valve 6 is supported by a spring provided in the head valve chamber 5 so as to be movable up and down. The head valve chamber 5 is a space formed by the upper end of the head valve 6 and the inner wall of the housing. An air passage 4 is provided on the inner wall of the housing forming a part of the head valve chamber 5. The air passage 4 can selectively communicate with the pressure accumulating chamber 1 or the atmosphere via the control valve 3. Therefore, the compressed air in the pressure accumulating chamber 1 flows into the head valve chamber 5 through the air passage 4.

  The control valve 3 is mainly composed of a plunger 9 and a valve piston 27. The valve piston 27 has a hollow cylindrical shape and includes an O-ring on the outer peripheral portion. The plunger 9 has a cylindrical shape and is provided with an O-ring on the outer peripheral portion like the valve piston 27. The plunger 9 is located in the hollow portion of the valve piston 27. In a state where the trigger 8 is not pulled, the plunger 9 is not pushed up, so that the air passage 4 communicates with the pressure accumulating chamber 1. When the plunger 9 is pushed upward in the state where the trigger 8 is pulled, the valve piston 27 moves downward and the head valve chamber 5 communicates with the atmosphere.

  In a state where the trigger 8 is not pulled, the head valve 6 is urged downward by two compressed air from the pressure accumulating chamber 1 and a spring provided in the head valve chamber 5. The force with which the spring provided in the head valve chamber 5 urges the head valve 6 downward is smaller than the force with which the compressed air in the pressure accumulating chamber 1 pushes the head valve 6 upward. Therefore, when the trigger 8 is pulled and the head valve chamber 5 communicates with the atmosphere, only the spring provided in the head valve chamber 5 is in a state of urging the head valve 6 downward. Thereby, the head valve 6 can move upward against the urging force of the spring.

  The cylinder 7 has a structure that can move up and down. An air passage 15 for sending the compressed air in the cylinder 7 to the return air chamber 13 is provided on the side surface of the cylinder 7. The air passage 15 is provided with a check valve 14 that allows compressed air to flow only in the direction of the return air chamber 13. A cylinder plate 20 is provided on the outer periphery of the cylinder 7. The cylinder plate 20 has a hollow cylindrical shape, and a seal member such as an O-ring is provided on each of the inner periphery and the outer periphery thereof. The inner periphery of the cylinder plate 20 is substantially equal to the outer periphery of the cylinder 7, and the outer periphery of the cylinder plate 20 is sealed with the housing inner wall of the driving machine body. The upper end surface of the cylinder plate 20 forms a part of the pressure accumulating chamber 1 and is fixed to the inner wall of the housing so as not to move.

  The moving means provided in the cylinder 7 will be described. The moving means is a flange portion 7 a of the cylinder 7. A flange portion 7 a is provided on the outer peripheral side surface of the cylinder 7, and the shape thereof is substantially equal to the cylinder plate 20. Further, a sealing member such as an O-ring is provided on the outer peripheral portion of the flange portion 7a. The flange portion 7 a is provided below the cylinder plate 20 and above the air passage 15. The air passage 15 is provided on the side surface of the cylinder 7, and connects the inside of the cylinder 7 and the return air chamber 13. Further, the air passage 15 includes a check valve 14 that allows compressed air to flow only from the inside of the cylinder 7 toward the return air chamber 13. A cylinder biasing portion 21 is formed by the outer peripheral surface of the cylinder 7, the flange portion 7a, the cylinder plate 20, and the inner wall of the housing. The cylinder biasing portion 21 is a hollow cylindrical space, and a spring 23 is provided inside. The spring 23 always urges the flange portion 7a forming a part of the cylinder urging portion 21 downward. A hole is provided in the inner wall portion of the housing forming a part of the cylinder urging portion 21 to communicate with the atmosphere. Thereby, when the force with which the pressure of the return air chamber 13 presses the flange portion 7a upward becomes larger than the force with which the spring 23 urges the flange portion 7a downward, the cylinder 7 returns to the return air chamber. This is a structure that moves upward against the urging force of the spring 23 by the pressure of 13.

  The bumper 16 is located at the lower end in the cylinder 7, and the upper surface thereof abuts when the piston 10 reaches the bottom dead center. Since the bumper 16 is an elastic body such as rubber, it is deformed and absorbs surplus energy of the piston 10.

  The injection part 24 is located at the lower end of the bumper 16 and forms an injection port 25 therein. The nail 11 stored in the magazine is sent to the injection unit 24 by a feeding member (not shown) that is biased in the direction of the injection port 25 by a spring. The injection port 25 also has a role of guiding the driver blade 26 integrated with the piston 10.

  Next, operation | movement of the driving machine which concerns on embodiment of this invention is demonstrated using FIGS. When an air hose (not shown) is connected, a part of the compressed air accumulated in the pressure accumulating chamber 1 flows into the control valve 3 through the air passage 2 and further into the head valve chamber 5 through the air passage 4. Flow into. The compressed air sent to the head valve chamber 5 further brings the head valve 6 and the cylinder 7 into close contact with each other and prevents the inflow of compressed air.

  When the trigger 8 is pulled, the plunger 9 in the control valve 3 is pushed up, and the compressed air in the head valve chamber 5 is discharged to the atmosphere via the air passage 4. When the compressed air in the head valve chamber 5 is exhausted, the head valve 6 is pushed up by the pressure of the compressed air in the pressure accumulating chamber 1, and the upper chamber of the cylinder 7 and the pressure accumulating chamber 1 are communicated. At the same time, the upper chamber of the cylinder 7 and the atmosphere are shut off, and the compressed air in the pressure accumulating chamber 1 flows into the upper chamber of the cylinder 7. The compressed air flowing into the upper chamber of the cylinder 7 moves the piston 10 rapidly to the bottom dead center and drives the nail 11. At this time, the air in the lower chamber of the cylinder 7 flows into the return air chamber 13 through the air passage 12.

  When the piston 10 passes through the air passage 15, a part of the compressed air that has flowed from the pressure accumulating chamber 1 into the upper chamber of the cylinder 7 flows into the return air chamber 13. The compressed air that has flowed into the return air chamber 13 presses the lower side of the flange portion 7 a that forms the upper portion of the return air chamber 13. When the force by which the compressed air that has flowed into the return air chamber 13 presses the lower side of the flange portion 7 a becomes larger than the force by which the spring 23 urges the upper side of the flange portion 7 a, the cylinder 7 acts on the urging force of the spring 23. It moves against the cylinder plate 20 side. At this time, the upper end surface of the cylinder 7 seals with the head valve 6 to block the flow of compressed air from the pressure accumulating chamber 1 to the upper chamber of the cylinder 7. The piston 10 lowered by the compressed air flowing in from the pressure accumulating chamber 1 contacts the bumper 16 at the bottom dead center. The bumper 16 absorbs excess energy of the piston 10 and deforms.

  Here, in the driving process of the driving machine according to the present invention, the relationship among the pressures in the pressure accumulating chamber 1, the upper chamber of the cylinder 7, and the lower chamber of the cylinder 7 will be described with reference to FIGS. In FIG. 2, since the trigger 8 is not pulled, compressed air supplied from an air hose (not shown) flows only into the pressure accumulating chamber 1. In FIG. 2, since compressed air does not flow into the upper chamber of the cylinder 7 and the lower chamber of the cylinder 7, the pressure remains at atmospheric pressure. When the relationship between the pressure in the pressure accumulating chamber 1, the cylinder 7 upper chamber, and the cylinder 7 lower chamber of the driving machine of FIG. 2 is expressed as a ratio, it is about 10: 1: 1.

  As shown in FIG. 3, when the trigger 8 is pulled, the head valve 6 moves upward, so that the compressed air in the pressure accumulating chamber 1 suddenly flows into the upper chamber of the cylinder 7. The pressure accumulation chamber 1 is continuously supplied with compressed air from an air hose (not shown). However, since the amount of compressed air flowing from the pressure accumulation chamber 1 into the upper chamber of the cylinder 7 is larger, the pressure in the pressure accumulation chamber 1 slightly decreases. When compressed air flows from the pressure accumulating chamber 1 into the upper chamber of the cylinder 7, the piston 10 moves downward. As a result, the pressure rises in both the upper chamber of the cylinder 7 and the lower chamber of the cylinder 7. The air in the lower chamber of the cylinder 7 is only slightly increased since the piston 10 is lowered. The ratio of the pressures in the pressure accumulating chamber 1, the cylinder 7 upper chamber, and the cylinder 7 lower chamber of the driving machine of FIG. 3 is about 9: 5: 1.5.

  As shown in FIG. 4, when the piston 10 passes through the air passage 15, the compressed air flows into the return air chamber 13 through the air passage 15. As a result, the pressure in the return air chamber 13 becomes larger than the urging force of the spring 23, so that the cylinder 7 moves upward. When the cylinder 7 moves upward, the upper end of the cylinder 7 seals with the head valve 6. Thereby, the communication between the pressure accumulating chamber 1 and the upper chamber of the cylinder 7 is blocked. Similar to the state of FIG. 3, compressed air continues to be supplied to the pressure accumulating chamber 1 from an air hose (not shown). However, the communication between the pressure accumulating chamber 1 and the upper chamber of the cylinder 7 is blocked. Therefore, the pressure in the pressure accumulating chamber 1 becomes equal to the pressure in FIG. Since the communication between the pressure accumulating chamber 1 and the upper chamber of the cylinder 7 is blocked, the compressed air does not flow into the upper chamber of the cylinder 7. Therefore, the pressure increase in the upper chamber of the cylinder 7 is slight. As the piston 10 further descends from the state of FIG. 3, the pressure in the lower chamber of the cylinder 7 further increases. The relationship among the pressures in the pressure accumulating chamber 1, the cylinder 7 upper chamber, and the cylinder 7 lower chamber of the driving machine in FIG. 4 is about 10: 6: 2.5.

  When the trigger 8 is returned, the plunger 9 returns and compressed air flows into the control valve 3. Then, the compressed air flows into the head valve chamber 5 through the air passage 2 and the air passage 4. When compressed air flows into the head valve chamber 5, the head valve 6 is pushed down, and the head valve 6 and the cylinder 7 move downward together. Thereafter, the lower side of the piston 10 is pressed by the compressed air accumulated in the return air chamber 13, and the piston 10 moves to the top dead center side. At this time, the compressed air on the upper side of the piston 10 is released into the atmosphere while being depressurized and silenced in the air passage 18 and the expansion chamber 19, and returns to the initial state.

  By driving the nail 11 in this way and blocking the compressed air flowing into the upper side of the piston 10 while the piston 10 is descending, the compressed air that does not become the driving energy can be reduced.

The embodiment of the present invention has been described above. The present invention is not limited to this embodiment, and can be changed without departing from the content of the invention.

1 is an overall sectional view showing an embodiment of a driving machine according to the present invention. The expanded sectional view which shows the principal part of one Embodiment of this invention driving machine. The expanded sectional view which shows the principal part when the trigger of this invention driving machine is pulled. The expanded sectional view which shows the principal part when the trigger of this invention driving machine is pulled. The whole sectional view showing one embodiment of the conventional driving machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Accumulation chamber 4 ... Air passage 6 ... Head valve 7 ... Cylinder 7a ... Flange part 10 ... Piston 13 ... Return air chamber 21 ... Cylinder urging part 23 ... Spring 24 ... Injection part

Claims (2)

A housing;
A pressure accumulating chamber for storing compressed air provided inside the housing;
Inside the accumulating chamber communicable with cylinder,
A head valve provided so as to be movable between a first position and a second position in the housing, and shuts off the communication between the pressure accumulating chamber and the cylinder when located in the first position ;
A trigger for controlling the movement of the head valve ,
In a driving machine that performs a driving operation by communicating the pressure accumulating chamber and the inside of the cylinder ,
The cylinder has moving means;
The head valve by pulling the trigger communicates the accumulating chamber and the cylinder moves to the second position from the first position,-out then the pressure working with compressed air to said moving means, said cylinder A driving machine characterized in that communication between the pressure accumulating chamber and the cylinder is interrupted by movement . A housing;
A pressure accumulating chamber for storing compressed air provided inside the housing;
Inside the accumulating chamber communicable with cylinder,
A head valve for controlling the accumulating chamber and communicating the inside of the cylinder,
A piston capable of reciprocating in the cylinder;
In a driving machine provided with a return air chamber for storing pressure for returning the piston to the top dead center,
The cylinder has a flange portion;
The flange portion seals with the housing to form part of the return air chamber;
An impacting machine characterized in that an elastic body that constantly urges the flange downward is provided at an upper portion of the flange portion, and the urging force of the elastic body is smaller than the maximum pressure of the return air chamber.

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