WO2016158130A1

WO2016158130A1 - Driver

Info

Publication number: WO2016158130A1
Application number: PCT/JP2016/055840
Authority: WO
Inventors: 賢志小堀; 佐藤　慎一郎
Original assignee: 日立工機株式会社
Priority date: 2015-03-31
Filing date: 2016-02-26
Publication date: 2016-10-06
Also published as: JP6319512B2; JPWO2016158130A1

Abstract

The purpose of the present invention is to provide a driver with which changes in impact force when the temperature changes can be limited. The present invention is a driver equipped with a compression chamber (42) provided inside a casing (62), a piston (31) that is provided inside the casing (62) so as to be capable of being operated and is for changing the pressure of the compression chamber (42), and a blade (21) for generating an impact force corresponding to the pressure of the compression chamber (42), wherein: the driver comprises a pressure adjustment chamber (43) provided inside the casing (62), a passage (45) for connecting the compression chamber (42) and the pressure adjustment chamber (43), and a relief valve (44) for opening and closing the passage (45); and the relief valve (44) reduces the pressure of the compression chamber (42) by opening the passage (45) when the pressure of the compression chamber (42) is higher than a prescribed value, and closes the passage (45) when the pressure of the compression chamber (42) is at or below the prescribed value.

Description

Driving machine

The present invention relates to a driving machine that applies a striking force to a striking element with the pressure of a pressure chamber.

2. Description of the Related Art Conventionally, a driving machine that applies a striking force to a striker with the pressure of a pressure chamber is known. The driving machine described in Patent Document 1 drives a nail into an object. The driving machine includes a cylinder provided in the housing, a piston accommodated in the cylinder so as to be able to reciprocate, a driver blade fixed to the piston, and a bellows provided in the cylinder.

The bellows is extendable, the first end of the bellows is connected to the piston, and the second end of the bellows is fixed to the housing. Compressed air is enclosed in the bellows to form a pressure chamber. The driving machine includes a motor provided in the housing, a gear train to which a rotational force is transmitted from the motor, and a cam that is rotated by the rotational force transmitted from the gear train. The cam has a protrusion that engages and disengages from the piston.

In the driving machine described in Patent Document 1, the rotational force of the motor is transmitted to the cam via the gear train. While the protrusion is engaged with the piston, the piston is moved from the bottom dead center to the top dead center by the power of the cam. While the piston moves from the bottom dead center toward the top dead center, the bellows is compressed and the pressure in the pressure chamber rises. When the piston reaches top dead center, the protrusion is detached from the piston, and the cam power is not transmitted to the piston. Then, an impact force according to the pressure in the pressure chamber is applied to the driver blade, and the driver blade drives the nail into the object.

JP 2014-69289 A

However, in the driving machine described in Patent Document 1, when the temperature changes, the pressure in the pressure chamber changes. As a result, there is a problem that the striking force changes due to a change in temperature.

The objective of this invention is providing the driving machine which can suppress the change of striking force, when temperature changes.

Another object of the present invention is to provide a driving machine capable of adjusting the hitting force.

The driving machine according to an embodiment includes a first pressure chamber provided in a casing, an operation member that is operatively provided in the casing and changes the pressure of the first pressure chamber, and the first pressure chamber. A hammer that generates a striking force according to the pressure of the second pressure chamber, the second pressure chamber provided in the casing, the first pressure chamber, and the second pressure chamber. And a first valve that opens and closes the first passage. The first valve opens the first passage when the pressure in the first pressure chamber is higher than a predetermined value. The first passage is opened to reduce the pressure in the first pressure chamber, and the first passage is closed when the pressure in the first pressure chamber is not more than a predetermined value.

The driving machine according to the present invention can suppress the change of the striking force even if the temperature changes.

The driving machine of the present invention can adjust the striking force of the striker by changing the pressure in the first pressure chamber.

It is front sectional drawing which shows Embodiment 1 of the driving machine of this invention. FIG. 2 is a partial side cross-sectional view of the driving machine shown in FIG. 1. FIG. 2 is a partial side cross-sectional view of the driving machine shown in FIG. 1. (A), (B) is typical sectional drawing which shows operation | movement of a driving machine. (A), (B) is typical sectional drawing which shows operation | movement of a driving machine. It is typical sectional drawing which shows the non-return valve provided in the driving device. It is front sectional drawing which shows Embodiment 2 of the driving machine of this invention. It is front sectional drawing which shows the principal part of the driving machine shown in FIG. It is front sectional drawing which shows the example of a change of the principal part of the driving machine shown in FIG. (A) is a schematic diagram of an operation panel corresponding to the driving machine shown in FIG. 9, and (B) is a block diagram showing a control system of the driving machine shown in FIG.

A driving machine according to an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1) A driving machine 10 shown in FIG. 1 includes a driving machine main body 11, a battery 12 attached to and detached from the driving machine main body 11, and a magazine 13 attached to and detached from the driving machine main body 11. Have. The driving machine main body 11 includes a hollow housing 14, a nose portion 15 continuous with the housing 14, a motor case 16 continuous with the housing 14, a grip 17 continuous with the housing 14, and a grip 17 and a motor case 16. And a mounting portion 18 to be mounted. Furthermore, the driving machine main body 11 has a connection portion 85 that connects the motor case 16 and the mounting portion 18. Further, the driving machine 10 includes an electric motor 19 and a speed reducer 22 housed in the motor case 16.

The nose portion 15 includes an injection port 23, and the blade 21 is disposed in the injection port 23 so as to be reciprocally movable. The magazine 13 accommodates a plurality of nails 24 and supplies the nails 24 to the injection port 23 one by one. Furthermore, a trigger 49 is provided on the grip 17.

The battery 12 has a storage case and a plurality of battery cells stored in the storage case. The battery cell is a secondary battery that can be charged and discharged, and a lithium ion battery, a nickel hydrogen battery, a lithium ion polymer battery, a nickel cadmium battery, or the like can be used as the battery cell. The battery 12 is a direct current power source, and the battery 12 can be attached to and detached from the attachment unit 18.

The electric motor 19 includes a stator 25 fixed to the motor case 16 and a rotor 26 that is rotatably provided in the motor case 16. In the electric motor 19, the rotor 26 is rotated by the power of the battery 12. The speed reducer 22 includes an input member and an output member. The speed reducer 22 has a low rotational speed of the output member relative to the rotational speed of the input member. The rotor 26 is connected to the input member of the speed reducer 22. A rotating shaft 27 connected to the output member of the speed reducer 22 is provided, and a disc-shaped plate 28 is provided on the rotating shaft 27. The rotating shaft 27 and the plate 28 are rotatable about the axis A1. A bearing 51 that rotatably supports the rotary shaft 27 is provided. The electric motor 19, the speed reducer 22, and the rotating shaft 27 are disposed concentrically about the axis A1. The plate 28 has a plurality of pins 29 as shown in FIGS. The plurality of pins 29 are arranged at intervals in the rotation direction of the plate 28.

A cylinder 30 is provided in the housing 14. The cylinder 30 has a cylindrical shape, and the cylinder 30 is positioned and fixed in the radial direction by a boss portion 32. Further, a holder 33 for positioning the cylinder 30 in the direction along the center line B 1 is provided in the housing 14. In FIG. 1 when the driving machine 10 is viewed from the front, the center line B1 and the axis A1 are arranged at right angles. Further, as shown in FIG. 2, when the cylinder 30 is viewed from the side, the axis A1 and the center line B1 do not intersect.

A damper 34 is fixed in the housing 14. The damper 34 is disposed at the open end of the cylinder 30. Specifically, the damper 34 is disposed at the opening end closer to the motor case 16 out of the two opening ends of the cylinder 30. The damper 34 is integrally formed of a rubber-like elastic body. The damper 34 is formed in an annular shape around the center line B 1, and the damper 34 includes a shaft hole 35.

The piston 31 is operable in the direction along the center line B 1 in the cylinder 30, and a seal member 36 is attached to the outer peripheral surface of the piston 31. The blade 21 has an axial shape, and the end of the blade 21 in the longitudinal direction is fixed to the piston 31. The blade 21 is disposed along the center line B 1 and is movable in the shaft hole 35. The blade 21 includes a rack 37 in a direction along the center line B1. The rack 37 is configured by alternately arranging concave portions and convex portions. As the plate 28 rotates, the pins 29 can engage or disengage from the rack 37. The damper 34 has a notch 52 extending outward from the inner surface of the shaft hole 35. The rack 37 can enter the notch 52 when the blade 21 operates.

A push rod 38 is provided on the nose portion 15. The push rod 38 is movable within a predetermined range in the direction along the center line B1 with respect to the nose portion 15. The push rod 38 is pushed and stopped in the direction along the center line B1 by the force of the compression spring. Specifically, the push rod 38 is pushed away from the cylinder 30 by the force of the compression spring. When the push rod 38 is pressed against the object, the push rod 38 moves toward the cylinder 30 against the force of the compression spring, and the push rod 38 comes into contact with the stopper and stops.

Wall members

39 and 40 are provided in the housing 14. The wall member 39 includes an outer cylinder portion 39A, an annular flange 39B that continues to the inside of the outer cylinder portion 39A, and an inner cylinder portion 39C that continues to the inner peripheral end of the flange 39B. The wall member 40 includes a cylindrical portion 40A and a disc portion 40B continuous with the cylindrical portion 40A. A partition wall 41 is interposed between the outer cylinder portion 39A and the cylindrical portion 40A. The wall member 39, the wall member 40, and the partition wall 41 are all positioned and fixed in the direction along the center line B1. The wall member 39 is fixed to the open end of the cylinder 30.

Both the wall member 39, the wall member 40, and the partition wall 41 are made of a metal material such as aluminum. A compression chamber 42 is formed from the cylinder 30 to the wall member 39, and a pressure adjusting chamber 43 is formed in the wall member 40. The partition wall 41 partitions the compression chamber 42 and the pressure adjustment chamber 43 in an airtight manner. The compression chamber 42 and the pressure adjustment chamber 43 are both airtight with respect to the outside of the housing 14. Air that is a compressible fluid is sealed in the compression chamber 42 and the pressure adjustment chamber 43. The piston 31 receives the pressure of the compression chamber 42. The casing 62 includes the cylinder 30 and

wall members

39 and 40.

A seal member 73 is provided for sealing a contact portion between the partition wall 41 and the cylindrical portion 40A, and a seal member 74 is provided for sealing a contact portion between the partition wall 41 and the outer cylinder portion 39A. Further, the inner cylinder portion 39C is attached to the outer periphery of the cylinder 30, and a seal member 75 that seals between the inner cylinder portion 39C and the cylinder 30 is provided.

As shown in FIG. 2, a relief valve 44 is provided on the partition wall 41. The relief valve 44 includes a passage 45 that connects the compression chamber 42 and the pressure adjustment chamber 43, a valve seat that forms the passage 45, a valve body that opens and closes the passage 45, and a spring that presses the valve body against the valve seat. I have. The relief valve 44 closes the passage 45 when the pressure P in the compression chamber 42 is equal to or less than a predetermined value Pmax. The relief valve 44 opens the passage 45 when the pressure P in the compression chamber 42 is higher than a predetermined value Pmax.

The predetermined value Pmax is a pressure necessary for driving the maximum length nail 24 used in the driving machine 10. Therefore, the set pressure of the relief valve 44 is set to a value that is equal to or slightly larger than the predetermined value Pmax.

A passage 46 is provided in the partition wall 41, and the passage 46 connects the compression chamber 42 and the pressure adjustment chamber 43. A check valve 47 that opens and closes the passage 46 is provided in the compression chamber 42. The check valve 47 is a metal leaf spring, and the check valve 47 is fixed to the partition wall 41 using a fixing element 48. The check valve 47 automatically opens and closes the passage 46 in accordance with the relationship between the pressure in the compression chamber 42 and the pressure in the pressure adjustment chamber 43. The check valve 47 closes the passage 46 when the pressure in the compression chamber 42 is equal to or higher than the pressure in the pressure adjustment chamber 43. The check valve 47 opens the passage 46 when the pressure in the compression chamber 42 is less than the pressure in the pressure adjustment chamber 43. That is, the check valve 47 opens the passage 46 in the direction in which the air in the pressure adjustment chamber 43 flows into the compression chamber 42, and closes the passage 46 in the direction in which the air in the compression chamber 42 flows into the pressure adjustment chamber 43. The compression chamber 42 and the pressure adjustment chamber 43 are both sealed from the outside of the housing 14 and are always at a pressure exceeding the atmospheric pressure. A stopper 50 is attached to the partition wall 41. The stopper 50 is fixed to the partition wall 41 by a fixing element 48. The stopper 50 restricts elastic deformation of the check valve 47.

Further, in the driving machine main body 11, a pressing detection sensor that detects that the push rod 38 is pressed against the object, a trigger switch that detects that the trigger 49 is operated, and a rotation angle of the plate 28 are detected. And an angle detection sensor. Further, a controller for rotating and stopping the electric motor 19 by processing signals from the pressing detection sensor, the trigger switch, and the angle detection sensor is provided in the driving machine main body 11.

Next, a usage example of the driving machine 10 will be described. If the trigger 49 is not operated and the trigger switch is turned off, the electric motor 19 is stopped. Further, as shown in FIG. 2, the piston 31 receives the pressure of the compression chamber 42 and comes into contact with the damper 34 and stops. That is, the piston 31 is stopped at the bottom dead center.

When the controller detects that the push rod 38 is pressed against the object and that the trigger switch is turned on, the controller rotates the electric motor 19 in one direction by a predetermined angle and removes the pin 29 from the rack 37. Then, the electric motor 19 is stopped. The rotational force of the electric motor 19 is transmitted to the rotary shaft 27 via the speed reducer 22. The plate 28 rotates counterclockwise in FIG. When the plate 28 rotates, the pin 29 engages with the rack 37, and the rotational force of the plate 28 is converted into the operating force of the blade 21. Therefore, the piston 31 moves from the bottom dead center toward the top dead center, and the pressure in the compression chamber 42 increases.

When the piston 31 reaches the top dead center as shown in FIG. 3 and all the pins 29 are separated from the rack 37, the controller stops the electric motor 19. The controller stores in advance the rotation angle from when the electric motor 19 starts rotating until it stops. When the pin 29 is disengaged from the rack 37, the force that raises the piston 31 is released, a striking force corresponding to the pressure in the compression chamber 42 is generated, and the striking force is applied to the blade 21. The blade 21 drives the nail 24 into the object, and the piston 31 stops at the position pressed against the damper 34 by the pressure of the compression chamber 42 as shown in FIG.

After driving the nail 24 into the object, the operator moves the push rod 38 away from the object with the trigger switch turned on. When the operator pushes the push rod 38 against the object again, the electric motor 19 rotates in a predetermined direction in one direction and the pin 29 is removed from the rack 37, and then the electric motor 19 stops. For this reason, the driving machine 10 performs the same operation as described above, the nail 24 is driven into the object, and the electric motor 19 stops. Thereafter, the operator repeats the above operation and sequentially drives the nail 24 into the object.

The operation of the relief valve 44 and the operation of the check valve 47 are shown in FIGS. First, the case where the temperature of the workplace where the driving machine 10 is used is low will be described. When the piston 31 is at the bottom dead center as shown in FIG. 4A, the pressure in the compression chamber 42 and the pressure in the pressure adjustment chamber 43 are the same pressure P0. When the piston 31 moves from the bottom dead center toward the top dead center, the pressure P in the compression chamber 42 increases. When the pressure P in the compression chamber 42 is equal to or lower than a predetermined value Pmax from when the piston 31 starts to move until the top dead center is reached as shown in FIG. Regardless of the position, the passage 45 is always closed.

The pressure P in the compression chamber 42 when the piston 31 reaches the top dead center is an initial pressure necessary for driving the nail 24 into the object even at a low temperature. The pressure P in the compression chamber 42 can be set based on conditions such as the maximum volume of the compression chamber 42, the pressure receiving area of the piston 31, and the stroke of the piston 31.

Furthermore, the case where the temperature of the workplace where the driving machine 10 is used becomes high will be described. If the pressure P in the compression chamber 42 is higher than a predetermined value Pmax between the start of the piston 31 and the arrival at the top dead center, the relief valve 44 opens the passage 45. Then, as shown in FIG. 5A, the air in the compression chamber 42 flows into the pressure adjustment chamber 43, and the pressure in the pressure adjustment chamber 43 increases. That is, the pressure P2 in the pressure adjustment chamber 43 is expressed by the following equation.

P2 = P0 + ΔP Here, P0 is the pressure in the pressure adjustment chamber 43 before the pressure increases, and ΔP is the pressure increased in the pressure adjustment chamber 43.

The relief valve 44 closes the passage 45 when the pressure in the compression chamber 42 becomes equal to or lower than a predetermined value Pmax. That is, the pressure P in the compression chamber 42 is equal to the predetermined value Pmax. The check valve 47 closes the passage 46 when the pressure P in the compression chamber 42 is equal to or higher than the pressure P2 in the pressure adjustment chamber 43.

After the relief valve 44 closes the passage 45, when the piston 31 moves toward the bottom dead center and the pressure P in the compression chamber 42 becomes less than the pressure P2 in the pressure adjustment chamber 43, the check valve 47 is shown in FIG. Open the passage 46 as shown in FIG. Then, the air in the pressure adjustment chamber 43 flows into the compression chamber 42 and the pressure in the pressure adjustment chamber 43 decreases. The check valve 47 closes the passage 46 when the pressure in the compression chamber 42 and the pressure in the pressure adjustment chamber 43 become the same.

Thus, the relief valve 44 opens the passage 45 when the pressure P in the compression chamber 42 is higher than the predetermined value Pmax. That is, the relief valve 44 suppresses the pressure increase in the compression chamber 42. The predetermined value Pmax is a value obtained based on the relationship between the pressure in the compression chamber 42 and the striking force applied to the blade 21. The pressure in the compression chamber 42 varies depending on the temperature in addition to the operating position of the piston 31. When the temperature is relatively high, the pressure in the compression chamber 42 is also relatively high, and the striking force applied to the blade 21 is also relatively high. The predetermined value Pmax is a value set by performing an experiment or simulation so that an excessive striking force is not applied to the blade 21.

For this reason, even if temperature changes, the pressure fluctuation of the compression chamber 42 when the piston 31 reaches the top dead center can be suppressed. That is, the striking force applied to the blade 21 is substantially the same regardless of the temperature. In other words, the striking force can be secured at a low temperature, and an excessive striking force can be prevented from being applied to the blade 21 at a high temperature. Therefore, stabilization of the striking force applied to the blade 21 and improvement of the durability of the blade 21 can both be achieved. *

Further, when the driving machine 10 is stored in a state where the piston 31 is stopped at the bottom dead center as shown in FIG. 2 and the temperature is changed from a high temperature state to a low temperature state, the compression chamber is connected via the check valve 47. The pressure of 42 and the pressure of the pressure adjusting chamber 43 can be made the same. For this reason, even if it is stored after using the driving machine 10 when the outside air temperature is high, and the driving machine 10 is used when the outside air temperature is low, the piston 31 is at the top dead center as shown in FIG. When reaching, the pressure P in the compression chamber 42 can be set to a predetermined value Pmax. An example when the outside temperature is high is summer, and an example when the outside temperature is low is winter.

Another example of a check valve is shown in FIG. The check valve 53 is provided on the wall member 39 or the wall member 40. A passage 54 is provided in the wall member 40 and a storage chamber 55 is provided. The passage 54 is connected to the pressure adjustment chamber 43, and the accommodation chamber 55 connects the passage 54 and the compression chamber 42. The check valve 53 includes a valve seat 56, a valve body 57 that opens and closes the passage 54, and a spring 58 that presses the valve body 57 against the valve seat 56. The valve body 57 and the spring 58 are accommodated in the accommodation chamber 55.

Further, an operation member 59 is provided. The operation member 59 is operated by an operator. The operation member 59 includes a shaft portion 60 and a knob 61 fixed to the shaft portion 60, and the knob 61 is disposed outside the housing 14. The shaft portion 60 is movable in the longitudinal direction of the shaft portion 60 with respect to the housing 14 and the wall member 40. The tip of the shaft portion 60 is disposed in the passage 54 and contacts the valve body 57.

When no operating force is applied to the operating member 59, the valve body 57 is pressed against the valve seat 56 by the force of the spring 58 to close the passage 54. When an operating force is applied to the operating member 59, the valve element 57 is separated from the valve seat 56 against the force of the spring 58, and the passage 54 is opened.

In the driving machine provided with the check valve 53 of FIG. 6, the relief valve 44 opens the passage 45 when the pressure P in the compression chamber 42 is higher than a predetermined value Pmax. For this reason, the pressure in the pressure adjusting chamber 43 increases and the pressure in the compression chamber 42 decreases. The relief valve 44 closes the passage 45 when the pressure P in the compression chamber 42 decreases to a predetermined value Pmax.

Thereafter, when the piston 31 moves toward the bottom dead center, the check valve 53 closes the passage 54 even when the pressure P in the compression chamber 42 becomes lower than the pressure P2 in the pressure adjustment chamber 43. When the operator applies an operating force to the operating member 59, the valve element 57 is separated from the valve seat 56 against the force of the spring 58 and the passage 54 is opened, and the pressure in the compression chamber 42 and the pressure in the pressure adjusting chamber 43. And become the same. When the operator releases the operating force applied to the operating member 59, the valve body 57 is pressed against the valve seat 56 by the force of the spring 58 and closes the passage 54. When the check valve 53 of FIG. 6 is used, the air in the pressure adjustment chamber 43 does not return to the compression chamber 42 unless the operator operates the operation member 59.

Therefore, the relief valve 44 and the check valve 53 do not operate for each impact, and the durability of the relief valve 44 and the durability of the check valve 53 can be improved. Further, when the driving machine 10 is stored with the piston 31 stopped at the bottom dead center as shown in FIG. 2 and the air temperature is changed from the high temperature state to the low temperature state, the pressure P of the compression chamber 42 is changed to the pressure adjusting chamber. Even when the pressure P2 is less than 43, the check valve 53 closes the passage 54. For this reason, when the operation member 59 is operated as described above, the pressure in the compression chamber 42 and the pressure in the pressure adjustment chamber 43 can be made the same. Therefore, even if it is stored after using the driving machine 10 when the outside air temperature is high and the driving machine 10 is used when the outside air temperature is low, the pressure P of the compression chamber 42 is kept at a certain predetermined value. Pmax can be set.

Here, the correspondence between the configuration described in Embodiment 1 and the configuration of the present invention will be described. The casing 62 is the casing of the present invention, the cylinder 30 is the cylinder of the present invention, and the wall member 39 is The first wall member of the present invention, and the wall member 40 is the second wall member of the present invention. The compression chamber 42 is the first pressure chamber of the present invention, the piston 31 is the operating member of the present invention, the passage 45 is the first passage of the present invention, and the pressure adjustment chamber 43 is the present invention. The relief valve 44 is the first valve of the present invention, and the battery 12 is the power supply device of the present invention.

The direction along the center line B1 is the predetermined direction of the present invention, and the predetermined value Pmax is the predetermined value of the present invention. Furthermore, the passage 46 is the second passage of the present invention, the

check valves

47 and 53 are the second valve of the present invention, and the partition wall 41 is the partition wall of the present invention. The operation member 59 is the operation member of the present invention, the cylinder 30 is the cylinder of the present invention, the blade 21 is the striker of the present invention, and the nail 24 is the object of the present invention. The electric motor 19 is the electric motor and motor of the present invention. The plate 28, the pin 29, and the rack 37 correspond to the power conversion mechanism of the present invention. Further, the plate 28 is the rotating member of the present invention, the pin 29 is the first engaging portion of the present invention, and the rack 37 is the second engaging portion of the present invention.

(Embodiment 2) Embodiment 2 of the driving machine of the present invention will be described with reference to FIG. 7 and FIG. 7 and 8, the same configurations as those shown in FIGS. 1 to 6 are denoted by the same reference numerals as those shown in FIGS. The driving machine 10 includes a relief valve 63. The relief valve 63 is a mechanism for adjusting the pressure in the compression chamber 42, and the relief valve 63 is disposed outside the cylinder 30 in the radial direction of the cylinder 30. The relief valve 63 includes a passage 64 that connects the compression chamber 42 and the pressure adjustment chamber 43, a valve body 65 that opens and closes the passage 64, a spring 66 that presses the valve body 65 against the partition wall 41, and a holder 67 that supports the spring 66. And.

The passage 64 passes through the partition wall 41. The valve body 65 includes a shaft portion 68 and a disc portion 69 provided at an end portion of the shaft portion 68 in the direction of the axis C1. The disc portion 69 is disposed in the pressure adjustment chamber 43. The shaft portion 68 is movable in the direction of the axis C 1 within the passage 64, and the outer diameter of the disc portion 69 is larger than the inner diameter of the passage 64. The axis C1 and the center line B1 are parallel to each other. The valve body 65 is supported by a holder 67 so as not to rotate. The holder 67 has a cylindrical shape, and the holder 67 is fixed to the flange 39B.

The spring 66 is disposed in the shaft hole 71 of the holder 67. A male screw is formed on the outer peripheral surface of the shaft portion 68, and a movable member 70 is attached to the outer peripheral surface of the shaft portion 68. The movable member 70 is annular, a female screw is formed on the inner peripheral surface of the movable member 70, and the movable member 70 is a spur gear. The internal thread of the movable member 70 meshes with the axial section 68 external thread.

The holder 67 is disposed from the compression chamber 42 to the outside of the wall member 39, and a seal member 72 that seals between the inner peripheral surface of the holder 67 and the shaft portion 68 is provided. The seal member 72 prevents the compressed air in the compression chamber 42 from leaking from the shaft hole 71. The spring 66 is a metal compression spring, and the spring 66 is disposed between the seal member 72 and the movable member 70 in the direction of the axis C1. The spring 66 is elastically deformed by receiving a compressive load, and the urging force of the spring 66 is transmitted to the valve body 65 via the movable member 70. The valve body 65 receives the biasing force of the spring 66 and is biased in the direction of the axis C 1 in a direction away from the pressure adjustment chamber 43. The valve body 65 stops when the disk portion 69 contacts the partition wall 41 with an urging force.

An adjustment mechanism 76 is provided in the housing 14. The adjustment mechanism 76 is a mechanism that adjusts the position of the movable member 70 in the direction of the axis C1. The adjustment mechanism 76 includes a disc-shaped dial 77, a shaft portion 78 fixed to the center of the dial 77, and a spur gear 79 provided on the shaft portion 78. The adjustment mechanism 76 is disposed so as to be rotatable about the center line of the shaft portion 78, and the spur gear 79 is engaged with the movable member 70. The movable member 70 is movable in the direction of the axis C 1 while meshed with the spur gear 79. Therefore, the biasing force of the spring 66 can be adjusted. Further, the adjustment mechanism 76 does not move in the direction of the axis C1 within the housing 14. In the direction of the axis C 1, the width of the spur gear of the movable member 70 is shorter than the width of the spur gear 79. A part of the outer peripheral surface of the dial 77 is exposed outside the housing 14 as shown in FIG.

Therefore, when the operator operates the dial 77 to rotate the shaft portion 78, the rotational force of the shaft portion 78 is transmitted to the movable member 70 via the spur gear 79, and the movable member 70 is transferred to the male screw of the shaft portion 68. Rotate along and move in the direction of the axis C1. By switching the rotation direction of the spur gear 79, the direction in which the movable member 70 moves in the direction of the axis C1 can be switched between the direction in which the movable member 70 is closer to the holder 67 and the direction in which the movable member 70 is away from the holder 67. is there.

A lever 80 is attached to the housing 14. The lever 80 is rotatable with the support shaft 81 as a fulcrum, and the first end portion 82 of the lever 80 contacts the tip of the shaft portion 68. An opening 83 is provided in the housing 14, and the second end 84 of the lever 80 is exposed from the opening 83 to the outside of the housing 14.

The driving machine 10 shown in FIGS. 7 and 8 does not include the passage 46 and the check valve 47. 7 and 8 performs the same operation and control for the same components as the driving machine 10 shown in FIGS. 1 to 3.

The driving machine 10 shown in FIG. 8 adjusts the pressure in the compression chamber 42 by the function of the relief valve 63. The relief valve 63 closes the passage 64 when the pressure P in the compression chamber 42 is equal to or lower than the set pressure P1. The relief valve 63 opens the passage 64 when the pressure P in the compression chamber 42 is higher than the set pressure P1. The set pressure P1 is a value determined from the urging force transmitted from the spring 66 to the valve body 65. More specifically, the valve element 65 of the relief valve 63 is urged in the direction of the axis C 1 by the force of the spring 66. Further, the pressure P in the compression chamber 42 is applied to the disc portion 69 of the valve body 65 from the passage 64. The direction of the urging force applied from the spring 66 to the valve body 65 is opposite to the direction of the urging force applied to the valve body 65 by the pressure of the compression chamber 42.

When the pressure in the compression chamber 42 is equal to or lower than the set pressure P1, the disk portion 69 is maintained in close contact with the partition wall 41 by the force of the spring 66, and the passage 64 is closed. That is, the spring 66 has a role as a valve closing mechanism. When the temperature of the environment in which the driving machine 10 is used rises and the pressure P of the compression chamber 42 exceeds the set pressure P1, the valve body 65 approaches the pressure adjustment chamber 43 against the biasing force of the spring 66. The direction 64 moves in the direction of the axis C1, and the passage 64 opens. For this reason, the air in the compression chamber 42 flows into the pressure adjustment chamber 43, and the pressure in the pressure adjustment chamber 43 increases. Therefore, an increase in pressure in the compression chamber 42 can be suppressed. When the pressure P in the compression chamber 42 becomes equal to or lower than the set pressure P1, the valve body 65 is moved by the biasing force of the spring 66, and the passage 64 is closed.

As described above, the driving machine 10 shown in FIGS. 7 and 8 increases the pressure in the compression chamber 42 when the piston 31 reaches the top dead center, similarly to the driving machine 10 shown in FIGS. Can be suppressed. Therefore, the same effect as the driving machine 10 shown in FIGS. 1 to 3 can be obtained.

In the driving machine 10 shown in FIG. 8, the operator can adjust the pressure at which the relief valve 63 opens the passage 64, that is, the set pressure P1. When the operator operates the dial 77 to rotate the shaft portion 78, the rotational force of the shaft portion 78 is transmitted to the movable member 70. That is, by switching the rotation direction of the shaft portion 78, the movable member 70 moves either in the direction approaching the holder 67 in the direction of the axis C1 or in the direction away from the holder. The urging force transmitted from the spring 66 to the valve body 65 via the movable member 70 is determined according to the distance between the movable member 70 and the holder 67 in the direction of the axis C1.

In FIG. 8, the solid first state where the distance between the holder 67 and the movable member 70 is short is compared with the second state indicated by a broken line where the distance between the holder 67 and the movable member 70 is long. The urging force transmitted from the spring 66 to the valve body 65 is larger in the first state than in the second state. The set pressure P1 increases as the urging force transmitted from the spring 66 to the valve body 65 increases.

As described above, in the driving machine shown in FIGS. 7 and 8, the operator can arbitrarily adjust the set pressure P1 at which the relief valve 63 opens by operating the dial 77. For this reason, it is possible to adjust the setting pressure P1 according to the temperature which uses the driving machine 10. FIG.

Note that after the passage 64 is opened and the air in the compression chamber 42 flows into the pressure adjusting chamber 43 and the passage 64 is closed, the operator can finish the driving operation. When the driving operation is not performed, the piston 31 is in a position other than the top dead center. That is, the air pressure in the compression chamber 42 is lower than the air pressure in the pressure adjustment chamber 43. Here, the operator can operate the lever 80 counterclockwise in FIG. 8 to move the valve body 65 against the urging force of the spring 66, thereby forcibly opening the passage 64. Then, the air in the pressure adjustment chamber 43 returns to the compression chamber 42 via the passage 64. Thereafter, when the operator releases his / her hand from the lever 80, the lever 80 is rotated clockwise in FIG. 8 by the force of the spring 66, and the valve body 65 stops when the disc portion 69 contacts the partition wall 41. The passage 64 is closed.

Also, the operator can adjust the set pressure P1 by operating the dial 77 based on conditions other than temperature. For example, if the set pressure P 1 is adjusted according to the length of the nail 24, the striking force applied to the nail 24 can be adjusted for each length of the nail 24. Specifically, the set pressure P1 can be set higher as the nail 24 becomes longer. In this case, the higher the set pressure P1, the stronger the striking force applied to the nail 24. Further, the set pressure P1 may be adjusted according to the hardness of the object into which the nail 24 is driven, and the striking force applied to the nail 24 may be adjusted for each hardness of the object. The worker sets the set pressure P1 higher as the hardness of the object is higher.

Another example of the adjusting mechanism for setting the set pressure P1 of the relief valve 63 will be described with reference to FIGS. Instead of the adjustment mechanism 76 of FIG. 7, an adjustment mechanism 86 shown in FIG. 9 can be provided. The adjustment mechanism 86 includes an adjustment motor 87 and a spur gear 89 provided on the output shaft 88 of the adjustment motor 87. The adjustment motor 87 is an electric motor, more specifically a stepping motor. When a voltage is applied from the battery 12, the adjustment motor 87 rotates the output shaft 88 by a predetermined angle and stops. Further, the controller 90 switches the rotation direction of the output shaft 88. Therefore, the direction in which the movable member 70 moves in the direction of the axis C1 can be switched between the direction in which the movable member 70 moves away from the holder 67 and the direction in which the movable member 70 approaches the holder 67 by switching the rotation direction of the spur gear 89. It is.

The driving machine 10 has an operation panel 92 shown in FIG. The operation panel 92 is provided in the driving machine main body 11. For example, the operation panel 92 is provided to be exposed on either the surface of the mounting portion 18, the surface of the motor case 16, or the surface of the connection portion 85. The operation panel 92 includes a switching button 93 and a display unit 94. The operator operates the switch button 93 to switch the set pressure P1 to a plurality of stages, for example, three stages of a first set pressure, a second set pressure, and a third set pressure according to the three types of length of the nail 24. be able to. The second set pressure is higher than the first set pressure, and the third set pressure is higher than the second set pressure. The display unit 94 is three lamps provided corresponding to the first set pressure, the second set pressure, and the third set pressure. The display unit 94 corresponding to the selected set pressure is turned on, and other displays The part turns off.

The driving machine 10 includes a controller 90 shown in FIG. The controller 90 is provided in the motor case 16. The controller 90 controls the electric motor 19 and the adjustment motor 87. An operation signal from the operation panel 92 is input to the controller 90. A current value detection sensor 91 is provided in the motor case 16, and the current value detection sensor 91 detects a current value supplied from the battery 12 to the electric motor 19. A signal output from the current value detection sensor 91 is input to the controller 90. An operation signal for the trigger 49 is input to the controller 90.

The driving machine 10 illustrated in FIG. 9 does not include the lever 80, the support shaft 81, and the opening 83 illustrated in FIG. On the other hand, the driving machine 10 shown in FIG. The stopper 95 is fixed in the housing 14. The stopper 95 is disposed outside the shaft portion 68 in the radial direction of the shaft portion 68. In a plan view perpendicular to the axis C1, the arrangement area of the stopper 95 and the arrangement area of the movable member 70 overlap. The movable member 70 is disposed between the stopper 95 and the holder 67 in the direction of the axis C1. When the spur gear 89 rotates, the movable member 70 moves in the direction of the axis C1 between the stopper 95 and the holder 67. .

The driving machine 10 shown in FIG. 9 can set three types of set pressures P 1 according to the length of the nail 24 by operating the operation panel 92 shown in FIG. 10. Then, the controller 90 controls the rotation direction and rotation angle of the adjustment motor 87 in accordance with the set pressure P1, and changes the distance between the movable member 70 and the holder 67. That is, the adjustment mechanism 86 in FIG. 9 can change the set pressure P1 at which the relief valve 63 opens the passage 64, similarly to the adjustment mechanism 76 in FIG. When the controller 90 controls the rotation direction and rotation angle of the adjustment motor 87 according to the set pressure P1, the movable member 70 stops at a position where it does not contact the stopper 95.

The driving machine 10 shown in FIG. 9 can control the adjustment motor 87 to return the air in the pressure adjustment chamber 43 to the compression chamber 42 via the passage 64 when the driving operation is not performed. . In this case, the operation panel 92 is provided with an operation unit for executing “control for returning the air in the pressure adjustment chamber 43 to the compression chamber 42 via the passage 64”. When this operation unit is operated, the controller 90 rotates the adjustment motor 87 and presses the movable member 70 against the stopper 95, and then rotates by a predetermined angle in the same rotation direction and stops. Then, the valve body 65 moves against the biasing force of the spring 66 from the time when the movable member 70 contacts the stopper 95 until the movable member 70 stops, and the passage 64 is forcibly opened. That is, the air in the pressure adjustment chamber 43 returns to the compression chamber 42 via the passage 64.

Thereafter, the controller 90 switches the rotation direction of the adjustment motor 87 to release the movable member 70 from the stopper 95 and then stops the adjustment motor 87. As a result, the valve body 65 is pushed by the urging force of the spring 66, and when the disc portion 69 comes into contact with the partition wall 41, the valve body 65 stops and the passage 64 is closed. The other configurations and operational effects of the driving machine 10 illustrated in FIG. 9 are the same as the configurations and operational effects of the driving machine 10 illustrated in FIGS. 7 and 8.

Further, another example in which the controller 90 controls the adjustment mechanism 86 will be described with reference to FIG. The controller 90 indirectly obtains the load of the electric motor 19 when the piston 31 is moved toward the top dead center from the signal of the current value detection sensor 91. The load of the electric motor 19 is an output of the electric motor 19 when the actual pressure in the compression chamber 42 when the piston 31 reaches top dead center is set to the set pressure P1. The longer the nail 24 is, the higher the striking force and set pressure P1 required for striking the nail 24 are. That is, the load of the electric motor 19 increases as the length of the nail 24 increases.

Therefore, the set pressure P1 can be adjusted by controlling the adjustment motor 87 so that a striking force corresponding to the length of the nail 24 is generated. For example, the set pressure P1 can be set so that the pressure of the compression chamber 42 becomes as high as possible when the piston 31 reaches the top dead center as the length of the nail 24 increases.

In the second embodiment, the control for adjusting the set pressure P1 by rotating and stopping the output shaft 88 of the adjusting motor 87 includes the control for adjusting the set pressure P1 stepwise, and the stepwise setting of the set pressure P1. Adjusting control.

The driving machine of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof. For example, the check valve shown in FIGS. 2 to 5 of the first embodiment may include a metal plate that is not subjected to spring treatment and a spring that presses the metal plate against the partition wall. The metal plate and the spring are disposed in the compression chamber 42. Further, the passage 54, the accommodation chamber 55, and the check valve 53 shown in FIG. 6 can be provided in the partition wall 41.

In the second embodiment, the mechanism for biasing the valve body 65 in the direction of the axis C1 in the direction in which the valve body 65 closes the passage 64 includes a solenoid in addition to the spring. Further, at least a part of the valve body 65 is manufactured from a magnetic material. The controller controls the voltage applied to the solenoid. The solenoid has a coil that is energized from the battery 12, and the solenoid generates a magnetic attractive force in accordance with the applied voltage. The valve body is urged by a magnetic attractive force to close the passage.

Then, when the air pressure in the pressure adjusting chamber 43 exceeds the set pressure P1, the valve body 65 moves against the magnetic attractive force, and the passage 64 is opened. Therefore, the controller can change the set pressure P1 by controlling the voltage applied to the solenoid to adjust the magnetic attractive force. In this case, the solenoid serves as both a valve closing mechanism that generates a force for closing the passage by the valve body and the adjusting mechanism of the present invention. For this reason, it is not necessary to provide a dedicated adjustment mechanism in addition to the valve closing mechanism.

Furthermore, a pressure detection means for detecting the pressure in the compression chamber 42 may be provided, and the controller 90 may drive the solenoid in accordance with the pressure in the compression chamber 42. The pressure detection means may be a pressure sensor or a current value detection sensor 91. The controller can estimate the pressure in the compression chamber 42 from the load current of the motor 19 when the piston 31 is moved from the bottom dead center toward the top dead center.

The spring 66 and the solenoid coil described in the second embodiment correspond to the biasing member of the present invention, and the

adjustment mechanisms

76 and 86 correspond to the adjustment mechanism of the present invention. The biasing member may be a mechanism that applies a biasing force to the valve body. The biasing member includes a hydraulic cylinder and a pneumatic cylinder in addition to a spring and a solenoid.

Motors that transmit rotational force to the speed reducer include an engine, a hydraulic motor, and a pneumatic motor in addition to an electric motor. The electric motor may be either a brush motor or a brushless motor. The power supply device that supplies power to the electric motor may be either a DC power supply or an AC power supply. Further, the driving machine of the present invention includes a first driving machine in which the axis is off the center line in a side view of the driving machine, and a second driving machine in which the axis is located on the center line. Including. The motion conversion mechanism in the second driving machine includes a single protrusion and a locking piece that can slide while the protrusion is in contact. The power conversion mechanism of the present invention may be a rack and pinion mechanism including a pinion gear provided on the plate 28 and a rack provided on the blade 21.

In the driving machine of the present invention, the operating member operates to reduce the volume of the first pressure chamber, whereby the pressure in the first pressure chamber increases. That is, there is no path for supplying the compressive fluid from outside the casing to at least one of the first pressure chamber and the second pressure chamber. The casing of the present invention includes a metal cylinder and wall member whose shape does not change even when the operation member operates. The casing of the present invention may be constituted by a bellows and a wall member. The partition wall is interposed between the wall member and the bellows, the first pressure chamber is formed in the bellows, and the second pressure chamber is formed in the wall member. The bellows expands and contracts when the operating member operates, and the pressure in the first pressure chamber changes.

The rotating member of the present invention includes a rotating shaft, a gear, a pulley, and a planetary gear mechanism carrier. The stoppers accommodated in the magazine include a bar-like nail and a U-shaped stopper. The driving machine of the present invention includes a driving machine that hits a stopper with an impactor and drives the stopper into an object, and an impacting machine that hits the object with the impactor and crushes or scrapes the object. Including.

DESCRIPTION OF SYMBOLS 10 ... Placing machine, 11 ... Placing machine main body, 12 ... Battery, 13 ... Magazine, 14 ... Housing, 15 ... Nose part, 16 ... Motor case, 17 ... Grip, 18 ... Mounting part, 19 ... Electric motor, 21 ... Blade, 22 ... Reduction gear, 23 ... Injection port, 24 ... Nail, 25 ... Stator, 26 ... Rotor, 27 ... Rotating shaft, 28 ... Plate, 29 ... Pin, 30 ... Cylinder, 31 ... Piston, 32 ...

Boss

33, 67 ... Holder, 34 ... Damper, 35, 71 ... Shaft hole, 36, 72, 73, 74, 75 ... Seal member, 37 ... Rack, 38 ... Push rod, 39, 40 ... Wall member, 39A ... Outside Tube portion, 39B ... Flange, 39C ... Inner tube portion, 40A ... Cylindrical portion, 40B ... Disc portion, 41 ... Partition, 42 ... Compression chamber, 43 ... Pressure adjustment chamber, 44, 63 ... Relief valve, 45, 46, 54, 64 ... Road, 47, 53 ... check valve, 48 ... fixed element, 49 ... trigger, 50 ... stopper, 51 ... bearing, 53 ... check valve, 55 ... storage chamber, 56 ... valve seat, 57, 65 ... valve body, 58, 66 ... Spring, 59 ... Operation member, 60, 68, 78 ... Shaft part, 61 ... Knob, 62 ... Casing, 69 ... Disc part, 70 ... Movable member, 76, 86 ... Adjustment mechanism, 77 ... Dial, 79, 89 ... spur gear, 80 ... lever, 81 ... support shaft, 82 ... first end, 83 ... opening, 84 ... second end, 85 ... connection, 87 ... adjusting motor, 88 ... output shaft, DESCRIPTION OF SYMBOLS 90 ... Controller, 91 ... Current value detection sensor, 92 ... Operation panel, 93 ... Switching button, 94 ... Display part, 95 ... Stopper, A1 ... Axis, B1 ... Center line

Claims

A first pressure chamber provided in the casing, an operating member provided in the casing so as to be operable and changing the pressure in the first pressure chamber, and a striking force corresponding to the pressure in the first pressure chamber are generated. A driving device comprising: a second pressure chamber provided in the casing; a first passage connecting the first pressure chamber and the second pressure chamber; A first valve that opens and closes one passage, and the first valve opens the first passage when the pressure in the first pressure chamber is higher than a predetermined value, and the pressure in the first pressure chamber The driving machine closes the first passage when the pressure in the first pressure chamber is equal to or lower than a predetermined value.
The driving device according to claim 1, wherein the striker is fixed to the operating member.
2. A second passage that connects the first pressure chamber and the second pressure chamber, and a second valve that opens and closes the second passage when the first passage is closed. Or the driving machine of 2 description.
The driving machine according to claim 3, wherein a partition wall that partitions the first pressure chamber and the second pressure chamber is provided, and the first valve and the second valve are provided in the partition wall.
The second valve closes the second passage when the pressure in the first pressure chamber is equal to or higher than the pressure in the second pressure chamber, and the pressure in the first pressure chamber is less than the pressure in the second pressure chamber. The driving machine according to claim 4, wherein the second passage is opened.
An operating member is provided for operating the second valve with an operator's operating force. When the operating force is applied to the operating member, the second valve closes the second passage, and the operating force applied to the operating member is released. The driving machine according to claim 4, wherein when opened, the second passage is opened.
The casing includes a cylinder that operably supports the operating member, a first wall member fixed to the cylinder, and a second wall member fixed to the first wall member, The first pressure chamber is formed between the cylinder and the first wall member, and the second pressure chamber is formed between the first wall member and the second wall member. The driving machine according to claim 6, wherein the driving machine is formed in the second wall member.
The driving machine according to claim 1 or 2, wherein the predetermined value at which the first valve opens and closes the first passage is changeable.
The driving machine according to claim 8, further comprising an adjustment mechanism that changes the predetermined value.
The first valve includes a valve body that opens and closes the first passage, and the adjustment mechanism includes a biasing member that applies a biasing force to the valve body and closes the first passage with the valve body, The driving device according to claim 9, wherein the valve body receives the pressure of the first pressure chamber and operates against a biasing force of the biasing member to open the first passage.
11. The driving machine according to claim 10, wherein the adjustment mechanism changes an urging force applied from the urging member to the valve body to change the predetermined value at which the first valve opens and closes the first passage.
The driving machine according to claim 10 or 11, wherein the adjustment mechanism includes a dial that adjusts an urging force of the urging member.
The driving machine according to claim 10 or 11, wherein the adjustment mechanism includes a motor for adjusting a biasing force of the biasing member.
The driving machine according to claim 10, wherein a lever that opens the first passage by operating the valve body against a biasing force of the biasing member is provided.
The striking device according to any one of claims 1 to 11, further comprising: a motor that generates power to be transmitted to the operating member; and a power conversion mechanism that converts the power of the motor into operating force of the operating member. Embedded machine.
The power conversion mechanism includes a rotating member that rotates with the power of the motor, a first engaging portion provided on the rotating member, and a second engaging portion provided on the striker, The operating member raises the pressure of the first pressure chamber when the rotating member rotates in a state where the first engaging portion is engaged with the second engaging portion, and the striker moves the first pressure chamber. The driving machine according to claim 12, wherein when the first engagement portion is separated from the second engagement portion after the pressure increases, an impact force corresponding to the pressure in the first pressure chamber is generated.
The motor is an electric motor that generates power by being supplied with electric power, and is attached to the casing, the motor and the power conversion mechanism, a driving machine main body, the driving machine main body, and the hammering The magazine which accommodates the stopper hit | damaged by a child, and the mounting part which is provided in the said driving machine main body, and the power supply device which supplies electric power to the said electric motor is attached or detached. The driving machine described.