JP2012187640A - Hammering tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology which contributes to avoiding a phenomenon that compressed air remains in a hammering tool.SOLUTION: This hammering tool 100 includes: a hammering piston 123 having a hammering unit 125 for hammering a stop; a hammering cylinder 121; a battery 110; a motor 111; a compression device 130 driven by the motor 111, a compressed air supply path 135; an opening/closing device 137 of the compressed air supply path 135; and control members 103a, 141 for controlling driving/stopping the motor 111. The hammering tool also includes an atmosphere release path 153 which makes the compression chamber 131a of the compression device 130 or the cylinder 121 communicate with the atmosphere. The atmosphere release path 153 is provided with an atmosphere release valve 151 which can make changeover between the opening mode and the closing mode of the atmosphere release path 153.

Description

  The present invention relates to an electro-pneumatic driving tool for driving a stopper such as a nail into a workpiece.

A conventional electro-pneumatic driving tool is described in, for example, Japanese Patent Publication No. 7-47270 (Patent Document 1). The driving tool described in Patent Document 1 includes a battery-driven electric motor and a compression device driven by the electric motor, and supplies compressed air generated by the compression device into a striking cylinder. The stopper is driven by operating the driving mechanism with the supplied compressed air.
As described above, according to the electro-pneumatic driving tool equipped with the electric motor driven by the battery and the compression device, the power cord for supplying power from the external power source and the compressed air from the external air supply source are supplied. The advantage that the air hose is unnecessary and the operation is easy can be obtained.

  However, in the conventional electro-pneumatic driving tool, for example, when the operation of the compression device stops halfway, an excessive load acts on the motor or the like due to the compressed air remaining in the compression device at the next start-up. there's a possibility that.

Japanese Patent Publication No. 7-47270

  In view of the above problems, an object of the present invention is to provide a technique that contributes to avoidance of residual compressed air in a driving tool.

  In order to achieve the above object, preferred embodiments of the driving tool according to the present invention include a cylinder, a piston, a battery, a motor driven by electric power supplied from the battery, and a volume change of the compression chamber driven by the motor. A compressor for generating compressed air, a compressed air supply path for supplying compressed air in the compression chamber into the cylinder, an opening / closing device for opening and closing the compressed air supply path, and for controlling driving and stopping of the motor And a control member. The piston includes a sliding portion that is slidably accommodated in the cylinder, and a long driving portion that is provided on the sliding portion and drives a stopper. Then, the compressed air in the compression chamber compressed by the compression device is supplied into the cylinder through the opening operation of the opening / closing device, the piston is moved linearly by the compressed air, and the stopper is moved by the driving portion of the piston. The driving operation is performed. The “driving tool” in the present invention typically corresponds to a nailing machine or a tucker, and the “stopper” is a straight bar having a pointed tip and is attached to the head. Widely includes those having or not having a shade and U-shaped staples. The “control member” in the present invention is typically a trigger that is pulled by a finger to drive the motor and a contact that is retracted in a direction opposite to the pressing direction by pressing the workpiece. In addition to operation members that can be operated by an operator such as an arm, widely includes members related to energization driving of the motor, such as a motor drive switch operated between an on position and an off position by the trigger and contact arm. .

  According to a preferred embodiment of the driving tool according to the present invention, the characteristic configuration includes an atmosphere opening passage that communicates the inside of the compression chamber or the cylinder with the atmosphere, and the atmosphere opening passage includes opening and closing of the atmosphere communication path. It is set as the structure provided with the atmospheric | air-release valve | bulb which can be switched. The atmosphere release valve is preferably a solenoid valve.

  According to the present invention, the air release valve is provided in the air release passage that communicates the inside of the compression chamber or the cylinder with the atmosphere, so that the inside of the compression chamber or the impact cylinder is switched between the open state and the closed state with respect to the atmosphere. Can do. Therefore, the driving tool can be steadily operated in a state where the atmosphere release valve is switched to the closed side. When the stopper driving operation by the piston driving portion is completed, the compression device then operates to increase the compression chamber volume. At that time, the piston moves into the compression chamber and the cylinder as the compression chamber volume increases. The generated negative pressure returns to the initial position before the driving operation. For this reason, it is possible to reliably return the piston to the initial position by setting the air release valve to switch to the open side after waiting for the piston to return to the initial position. In other words, during the steady operation of the driving tool, the air release valve functions as a member that keeps the normal cycle of the driving operation of the stopper every time the stopper is driven.

  On the other hand, in a state where the atmosphere release valve is switched to the open side, the compression chamber or the cylinder can be opened to the atmosphere. For this reason, for example, by setting the air release valve to switch to the open side when the compression device stops in the middle of the compression operation, the motor or the like is caused by residual compressed air in the compression chamber at the next start-up. It is possible to prevent an excessive load from acting and protect the motor and the like from the overload. In addition, when compressed air remains in the compression chamber, when the open / close device of the compressed air supply path is opened, compressed air is supplied from the compression chamber to the cylinder, and an unexpected driving operation is performed. However, according to the present invention, such an unexpected driving operation can be avoided.

According to the further form of the driving tool according to the present invention, when the internal mechanism defined by the battery, the motor, the compression device, the opening / closing device, the piston, and the control member is in a predetermined operation state, the atmosphere release valve is switched. Is done. The “predetermined operation state” in the present invention typically means that when all of the internal mechanisms are in a steady operation state, and at least one of the internal mechanisms is in an unsteady operation state different from the steady operation state. Any of the operating states is suitably included.
According to the present invention, the air release valve can be switched when the internal mechanism is in a predetermined operation state.

  According to the further form of the driving tool which concerns on this invention, it has a detection means which detects the operation state of an internal mechanism, The structure which switches an air release valve when the said detection means detects the predetermined operation state of an internal mechanism It is said.

  According to the further form of the driving tool which concerns on this invention, a predetermined operation state is defined by the operation state of the control member which controls a drive and a stop of a motor. Typically, this corresponds to the case where the operator stops the operation during the operation of the control member. When such an operating state is performed, the atmosphere release valve is switched to the open side, and the compressed air in the compression chamber or cylinder is released to the atmosphere, so that the motor and the like can be protected from overload caused by residual compressed air. Unexpected driving of fasteners can be avoided. In addition, the control member according to the present invention is preferably configured by a trigger that energizes the motor by a pulling operation by an operator and stops the motor by releasing the pulling operation.

The predetermined operating state of the internal mechanism according to the present invention can be set in various forms as described below, in addition to being determined by the operating state of the control member that controls the driving and stopping of the motor. The
One is determined by the operating state of the compressor. Typically, when the power transmission mechanism that transmits the rotational output of the motor to the compressor stops during operation (when the internal mechanism is in an unsteady operation state), or when the compressor is a reciprocating type If the crank mechanism that linearly moves the compression piston stops in the middle of the compression operation (when the internal mechanism is in an unsteady operation state), the compression piston returns to the initial position (internal This is the case when the mechanism is in a steady operating state.
The other is determined by the operating state of the piston that drives the stopper. Typically, when the piston stops in the middle of operation (when the internal mechanism is in an unsteady operation state), or when the piston returns to the initial position when one cycle of the driving operation is completed (When the internal mechanism is in a steady operation state) corresponds to this.
Still another is determined by the pressure value in the compression chamber. Typically, this is the case when the pressure in the compression chamber rises abnormally (when the internal mechanism is in an unsteady operation state).
Still another one is determined by the operating state of the switchgear. Typically, this corresponds to the case where the opening / closing device does not perform the opening operation at the timing when the opening / closing device should originally perform the opening operation (when the internal mechanism is in an unsteady operation state).
The other is determined by the state of energy supply to the compressor. Here, the energy is the rotational force output to the compression device by the motor to drive the compression device, the electric power supplied from the battery to the motor to drive the motor, and the like. Therefore, the predetermined operating state of the internal mechanism can be set as, for example, a current value or a voltage value related to driving of the motor, or a temperature value, and when these measured values exceed a predetermined set value ( The atmospheric release valve can be configured to switch to the open side when the internal mechanism is in an unsteady operation state.

  According to the further form of the driving tool which concerns on this invention, it determines with the correlation state of the several element of the predetermined operation states defined in Claim 4 and Claims 6-10. According to the present invention, it is possible to avoid a sensitive operation of the atmosphere release valve by switching the atmosphere release valve when a plurality of conditions are met.

  According to the present invention, in the driving tool, a technique that contributes to avoidance of residual compressed air is provided.

It is sectional drawing which shows the whole structure of the nail driver which concerns on embodiment of this invention, and shows an initial state. The compression middle state of the compression device driven by an electric motor is shown. The main valve is opened and a nail is driven by the driver. The striking piston return state due to negative pressure is shown. The compression piston stops in the middle of compression, and the air release valve is activated. It is a figure which shows other embodiment of this invention, and the piston for compression stops in the middle of compression, and shows the state which the air release valve and the main valve act | operated.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. This embodiment will be described using an electro-pneumatic nailing machine as an example of an electro-pneumatic driving tool. As shown in FIG. 1, the nailing machine 100 generally includes a main body 101 as a tool main body, a long handle 103 that is gripped by an operator, and a stopper that is driven into a workpiece. And a magazine 105 loaded with the nail n. The handle portion 103 protrudes from the side surface portion on one end side (the upper side in the drawing) of the main body portion 101 in the long axis direction (the vertical direction in FIGS. 1 to 5) toward the side (the right side in the drawing) intersecting the long axis direction. It is provided integrally in a state. A rechargeable battery pack 110 serving as a power source for the drive motor 111 is attached to the protruding end portion of the handle portion 103. 1 to 5 show a state in which the nailing machine 100 faces downward, that is, a state in which the front end portion (lower end portion in the drawing) of the main body 101 is directed to the workpiece. For this reason, the downward direction in FIGS. 1 to 5 is the driving (launching) direction (major axis direction) of the nail n, which is the direction in which the driver 125 hits the nail n.

  The main body 101 is mainly composed of a main body housing 107 in which a striking cylinder 121 of the nail driving mechanism 120 and a compression cylinder 131 of the compression device 130 are integrally formed, and a motor housing 109 in which a drive motor 111 is accommodated. Is done. The motor housing 109 is disposed substantially parallel to the handle portion 103 at a front end side (lower end side) of the main body housing 107 at a predetermined interval, and one end side in the long axis direction is connected to the main body housing 107. The end side is connected to the protruding side end portion of the handle portion 103.

  A driver guide 141 that constitutes an injection port for the nail n is disposed at the tip of the impact cylinder 121 in the main body housing 107 (downward in FIGS. 1 to 5). The magazine 105 is arranged on the foremost side of the main body 101 in a state of being close to the motor housing 109 and substantially parallel to the motor housing 109, the nail supply side tip is connected to the driver guide 141, and the other end is the motor housing. The other end of 109 is connected. Although not shown for convenience, the magazine 105 is provided with a pusher plate for pushing the nail n in the supply direction (leftward in FIGS. 1 to 5), and the nail n is attached to the driver guide 141 by the pusher plate. The driving passage 141a is configured to be supplied one by one from the direction intersecting the driving direction. For convenience of explanation, the front end side (lower side in the figure) of the main body 101 in the major axis direction is referred to as the front, and the opposite side is referred to as the rear.

  The striking cylinder 121 of the nail driving mechanism 120 and the compression cylinder 131 of the compression device 130 are formed so that their major axis directions are parallel to each other. A striking piston 123 for striking the nail n is accommodated in the striking cylinder 121 so as to be slidable in the long axis direction. The striking cylinder 121 corresponds to a “cylinder” in the present invention. The striking piston 123 includes a piston main body 124 that is slidably accommodated in the striking cylinder 121, and a long driver for striking the nail n, which is integrally provided in the piston main body 124. 125, which moves linearly in the long axis direction of the hitting cylinder 121, and functions as an operating member that the driver 125 moves forward in the driving passage 141a of the driver guide 141 and drives the nail n. The striking piston 123 corresponds to the “piston” in the present invention, the piston main body portion 124 corresponds to the “sliding portion” in the present invention, and the driver 125 corresponds to the “driving portion” in the present invention. A nail driving mechanism 120 is configured by the hitting cylinder 121 and the hitting piston 123.

  A compression piston 133 is accommodated in the compression cylinder 131 of the compression device 130 so as to be slidable in the long axis direction. The compression piston 133 is driven from the drive motor 111 via the crank mechanism 115. The drive motor 111 is disposed in the motor housing 109 so that the rotation axis intersects the long axis direction of the compression cylinder 131. The rotation output of the drive motor 111 is appropriately decelerated by the gear reduction mechanism 113 and converted into a linear motion by a crank mechanism 115 as a motion conversion mechanism to reciprocate the compression piston 133 linearly. As a result, the volume of the compression chamber 131a, which is the internal space of the compression cylinder 131, changes, and the compression piston 133 moves to the rear side that decreases the compression chamber 131a, so that the air in the compression chamber 131a is compressed. That is, in the present embodiment, a reciprocating type compression device mainly composed of the compression cylinder 131, the compression piston 133, and the crank mechanism 115 is used as the compression device 130.

  The crank mechanism 115 has a crank shaft 115a that is decelerated and rotated by the gear reduction mechanism 113, an eccentric pin 115b provided at a position that is eccentric from the rotation center of the crank shaft 115a, and one end that is rotatable relative to the eccentric pin 115b. The other end is connected to the compression piston 133 and is connected to the compression piston 133 so as to be relatively rotatable. The connection rod 115c is housed inside the main body housing 107 in the front region of the compression cylinder 131.

  The drive motor 111 includes a trigger 103a provided on the handle portion 103 so as to be rotatable about a support shaft 103c and a contact arm provided in a tip region of the main body 101 (in this embodiment, the driver guide 141 is a contact). The driving and stopping are controlled by the arm function). That is, a trigger 103a that can be operated with fingers is put into the handle portion 103, and an on state in which the drive motor 111 is energized and driven when the trigger 103a is pulled and the pulling operation is released and the drive motor is released. A trigger switch 103b for driving the motor that is switched to an OFF state that stops 111 is installed.

  On the other hand, a driver guide 141 that also serves as a contact arm (in the following description, the contact arm 141 is referred to only when the driver guide 141 functions as a contact arm) is attached to be movable in the major axis direction (striking direction) of the nail n. For the sake of convenience, it is biased so as to protrude toward the tip side by a spring (not shown). When the contact arm 141 is in the protruding position, the contact arm switch for driving the motor (not shown) is turned off for convenience, and the contact arm switch is turned on when the contact arm 141 is moved to the main body housing 107 side. It is said. The drive motor 111 is energized when both the trigger switch 103b and the contact arm switch are switched on, and is stopped when one or both are switched off. The trigger 103a and the contact arm 141 correspond to the “control member” in the present invention.

  The main body housing 107 is provided with a communication passage 135 that allows the compression chamber 131a of the compression cylinder 131 to communicate with the inside of the impact cylinder 121, and a main valve 137 that opens and closes the communication passage 135. The communication path 135 corresponds to the “compressed air supply path” in the present invention, and the main valve 137 corresponds to the “opening / closing device” in the present invention. As shown in FIG. 1, in the nail driver 100, the striking piston 123 is moved to the rearmost position (the upper end position in the figure), and the compression piston 133 is moved to the frontmost end position (the bottom dead center). The state is defined as the initial position. The main valve 137 is provided on the cylinder head side of the compression cylinder 131 and is constituted by a normally closed type solenoid valve as an electrically driven valve that closes when no power is supplied. The compression piston 133 is moved to the end position. The communication path 135 is opened in the vicinity of the moved top dead center. Therefore, when the main valve 137 opens the communication path 135, the compressed air in the compression chamber 131a compressed by the compression piston 133 is supplied to the striking cylinder 121, and the striking piston 123 is moved by the supplied compressed air. The nail n is hit by the driver 125, and the nail n is driven into the workpiece.

  The hitting cylinder 121 is formed with an escape hole 127 with a check valve 127a for releasing the compressed air in the hitting cylinder 121 into the atmosphere at the end of the nail driving operation or just before the end of the nail driving operation. When the striking piston 123 is moved to the foremost position (see the position shown in FIG. 3), the escape hole 127 passes through the inside of the striking cylinder 121 through the passage of the piston main body 124 of the striking piston 123. It is provided at a position where it can communicate with the atmosphere. In other words, the configuration is such that the atmosphere communicates with the inside of the striking cylinder 121 at the same time as the nail driving by the driver 125 is completed, whereby the compressed air in the striking cylinder 121 is released into the atmosphere at the same time as the striking is completed. The check valve 127 a is configured by a leaf spring arranged so as to close the escape hole 127 outside the impact cylinder 121, and air in the atmosphere flows into the impact cylinder 121 from the escape hole 127. (Backflow) is regulated.

  When the compression piston 133 after the compression operation moves forward, the volume of the compression chamber 131a is increased, whereby the compression chamber 131a and the inside of the impact cylinder 121 become negative pressure, and the negative pressure causes the impact piston 123 to move. It is set as the structure moved to back (refer FIG. 4). Further, when the compression piston 133 is placed at the foremost end position (bottom dead center) as an initial position, the compression cylinder 133 passes through the piston main body 133a of the compression piston 133 so that the compression cylinder 133 passes through the atmosphere. An outside air supply port 139 that communicates with the compression chamber 131a is provided. The main valve 137 is configured to close the communication passage 135 when the piston main body 133a of the compression piston 133 passes the outside air supply port 139 and is placed at the foremost end position (bottom dead center). . Thus, the nail driving operation by the nail driver 100 according to the present embodiment is configured such that when the compression piston 133 reciprocates once, the driver 125 of the driving piston 123 performs one nail driving operation. Yes.

  Next, the operation and method of use of the nailing machine 100 configured as described above will be described. In the initial state shown in FIG. 1, when the contact arm 141 is pressed against the workpiece and the contact arm switch is turned on, and the trigger 103a is pulled and the trigger switch 103b is turned on, the drive motor 111 is energized. As a result, the crank mechanism 115 is driven via the gear reduction mechanism 113, the compression piston 133 starts moving backward, and the communication between the compression chamber 131a and the atmosphere by the outside air supply port 139 is blocked. At this time, the main valve 137 closes the communication path 135, so that the volume of the compression chamber 131a is reduced and the air trapped in the compression chamber 131a is compressed. The state during compression is shown in FIG.

  The main valve 137 is energized to open the communication path 135 near the top dead center of the compression operation in which the compression piston 133 approaches the end position. For this reason, the compressed air in the compression chamber 131a is supplied into the striking cylinder 121 through the communication path 135, and the striking piston 123 is moved forward by the compressed air. Then, the driver 125 of the hammering piston 123 moved forward strikes the nail n waiting in the hammering passage 141a of the driver guide 141, and hammers it into the workpiece. This state is shown in FIG.

  When the piston main body 124 of the striking piston 123 passes through the escape hole 127, the compressed air in the striking cylinder 121 is released into the atmosphere through the relief hole 127. At the same time, the compression piston 133 at the rearmost position changes direction and is moved forward. Due to this forward movement, the volume of the compression chamber 131 a is increased and the compression chamber 131 a is made negative, and the negative pressure acts on the striking piston 123 through the communication passage 135 and the striking cylinder 121. As a result, the striking piston 123 is sucked and returned to the rear position before striking. This returning halfway state is shown in FIG.

  When the compression piston 133 returns to the initial position before compression (bottom dead center), the outside air supply port 139 is opened, and air in the atmosphere is supplied into the compression chamber 131a. Further, when the compression piston 133 returns to the position before the compression start, even if the trigger switch 103b and the contact arm switch are kept on, the power supply to the drive motor 111 is cut off and the drive motor 111 is stopped simultaneously. The power supply to the main valve 137 is cut off, and the main valve 137 closes the communication path 135. Thus, one cycle of the nailing operation is completed.

  The illustration of the interruption of energization to the drive motor 111 and the energization and interruption of the main valve 137 are omitted for the sake of convenience. , And based on the detection signal, it is configured to be controlled by a control device (controller) provided to control at least the drive motor 111.

  As described above, the electro-pneumatic nailing machine 100 according to the present embodiment drives the compression device 130 using the drive motor 111 that drives the battery pack 110 as a power source, and is generated by the compression device 130. Using the compressed air, the striking piston 123 is moved linearly and the nail n is driven by the driver 125. For this reason, both a power cord for supplying external power to the nailing machine and an air hose for supplying compressed air from an external compressed air source to the nailing machine are unnecessary. Thus, a nailing machine with high usability is provided.

  By the way, the nailing machine 100 configured and acting as described above includes the trigger 103a, the drive motor 111, the compression device 130, the nail driving mechanism 120, and the like as functional members related to the nail driving operation. It is conceivable that at least one of the internal mechanisms of the nailing machine 100 becomes an operation state deviating from a range permitted as a normal operation state (hereinafter, this operation state is referred to as an unsteady operation state). As an example, for example, during the compression of the compression device 130, it is conceivable that the operator releases the pressing operation of the contact arm 141 against the workpiece or cancels the pulling operation of the trigger 103a. That is, the nailing operation may be stopped halfway. In this case, the drive motor 111 stops in a state where the compressed air is stored in the compression chamber 131a. In this state, if the main valve 137 is inadvertently opened for some reason, the compressed air in the compression chamber 131a is supplied to the striking cylinder 121, and an unexpected striking operation may be performed. If the main valve 137 is not opened, an excessive load may be applied to the drive motor 111 or the compressor 130 due to the compressed air remaining in the compression chamber 131a at the next start-up.

  Therefore, in order to solve the above-described problems, in the present embodiment, an air release valve 151 that can release the pressure of the compression chamber 131a of the compression device 130 to the atmosphere is provided. When the operator cancels the pulling operation of the trigger 103a during the compression of the compression device 130 or when the pressing operation of the contact arm 141 against the workpiece is released, the atmosphere release valve 151 is opened to release the atmosphere. The pressure in the compression chamber 131a is released to the atmosphere through the passage 153, thereby blocking energy transmission to the striking piston 123. The atmosphere release valve 151 corresponds to the “atmosphere release valve” in the present invention, and the atmosphere release passage 153 corresponds to the “atmosphere release path” in the present invention. Composed. Further, when the operator cancels the pulling operation of the trigger 103a during the compression of the compression device 130 or when the pressing operation of the contact arm 141 against the workpiece is canceled, the “predetermined operation of the internal mechanism” according to the present invention. Corresponds to "state".

  As shown in FIGS. 1 to 5, at the rear end portion (head side) of the compression cylinder 131, the atmosphere release passage 153 that releases the pressure in the compression chamber 131 a to the atmosphere, and the atmosphere release passage 153 is opened and opened. An air release valve 151 that closes is provided. The atmosphere release valve 151 is configured by a normally open type solenoid valve as an electrically driven valve that opens the atmosphere release passage 153 when not energized, and is configured to close the atmosphere release passage 153 when energized.

  In the present embodiment, when the trigger 103a is pulled and the trigger switch 103b is turned on and the contact arm 141 is pressed against the workpiece and the contact arm switch is turned on (drive motor 111). When the air release valve 151 is energized, the air release valve 151 is turned on, and when either the trigger switch 103b or the contact arm switch is turned off, the air release valve 151 is turned off. It is configured as follows. The trigger 103a, the trigger switch 103b, the contact arm 141, and the contact arm switch correspond to the “control member” in the present invention.

  The present embodiment is configured as described above. Therefore, when the operator pushes the contact arm 141 against the workpiece and pulls the trigger 103a so as to perform the nailing operation, both the contact arm switch and the trigger switch 103b are turned on. For this reason, when the atmosphere release valve 151 is energized, the atmosphere release valve 151 is operated to the closed side, and the atmosphere release passage 153 is closed. At this time, as described above, since both the contact arm switch and the trigger switch 103b are turned on, the drive motor 111 is energized, so that a series of nailing operations are performed via the compression device 130 and the nail driving mechanism 120. Will be carried out.

  On the other hand, when the operator cancels the pulling operation of the trigger 103a during the operation, or cancels the pressing operation of the contact arm 141 against the workpiece, the trigger switch 103b or the contact arm switch is turned off, and the drive motor 111 is stopped. Therefore, normally, the compressed air remains stored in the compression chamber 131a of the compressor 130. However, according to the present embodiment, when the trigger switch 103b or the contact arm switch is turned off, the atmosphere release valve 151 is de-energized and the atmosphere release valve 151 is actuated to the open side (by the built-in spring). Then, the air opening passage 153 is opened. This state is shown in FIG. That is, the atmosphere release valve 151 is switched to the open side in conjunction with the operation release operation of the trigger 103a or the contact arm 141. For this reason, the compressed air in the compression chamber 131a is released to the atmosphere, and energy transmission from the compression device 130 to the nail driving mechanism 120 is interrupted. Therefore, even when the main valve 137 is opened while the compression device 130 is stopped in the middle of compression, the nailing operation by the driver 125 is not performed. That is, according to the present embodiment, by operating the air release valve 151 to the open side, the driving operation of the nail n can be disabled and the unexpected driving operation of the nail n can be prevented. In addition, an excessive load is not applied to the drive motor 111 or the compression device 130 due to the compressed air remaining in the compression chamber 131a at the next start-up, and the drive motor 111 or the compression device 130 is overloaded. Can be protected from.

  In the present embodiment, when the nail driving is finished, when the position detection sensor appropriately detects that the striking piston 123 has returned to the initial position before the nail driving operation, the control device is based on the detection signal. The (controller) is configured to switch the atmosphere release valve 151 to the open side. Thus, by waiting for the impact piston 123 to return to the initial position, the atmosphere release valve 151 is switched to the open side, so that the compression chamber 131a and the impact chamber are used until the impact piston 123 returns to the initial position. The negative pressure state in the cylinder 121 is reliably maintained. That is, in the steady operation state, the air release valve 151 functions as a member that keeps the normal cycle of the nail driving operation. At this time, the switching to the open side according to the command of the controller of the atmosphere release valve 151 is triggered by the pulling operation of the trigger 103a by the operator and the pressing operation of the contact arm 141 against the workpiece. The switch 103b and the contact arm 141 are configured to be performed even when both are on.

  Next, another embodiment of the present invention will be described. In the modification shown in FIG. 6, the atmosphere release valve 151 is provided on the cylinder head side of the hammering cylinder 121 in the nail driving mechanism 120. An air release passage 153 that connects the communication passage 135 and the atmosphere is set in the middle of the air flow direction of the communication passage 135 that connects the compression chamber 131a and the inside of the blow cylinder 121, and the air release passage 153 is opened to the atmosphere. The valve 151 is opened and closed. The air release valve 151 is configured as a normally open type solenoid valve. Further, when the atmosphere release valve 151 is operated to the opening side, the main valve 137 is also configured to be operated to the opening side. Note that configurations other than those described above are configured in the same manner as in the above-described embodiment.

  Therefore, according to the present embodiment, when the operator releases the pulling operation of the trigger 103a during the operation, or when the pressing operation of the contact arm 141 against the workpiece is released, the main valve 137 is The air release valve 151 is operated on the opening side to open the air opening passage 153 while the communication passage 135 is opened by operating on the opening side. This state is shown in FIG. For this reason, the compression chamber 131a and the inside of the hammering cylinder 121 are both communicated with the atmosphere, the energy transfer between the compression device 130 and the nail driving mechanism 120 is cut off, and the driver 125 unexpectedly drives the nail n. Can be prevented.

  Next, a modified example relating to “a predetermined operating state of the internal mechanism, in other words, an unsteady operating state” that defines a condition for switching the atmosphere release valve 15 to the open side will be described.

[Modification 1]
In the first modification, although not shown for convenience, the unsteady operation state of the internal mechanism is that the trigger 103a or the contact arm 141 as a control member that controls the driving and stopping of the driving motor 111 that can be operated by the operator. It is determined by the operating state. Specifically, when either the trigger 103a or the contact arm 141 is unexpectedly locked at the position where the switch is turned on and cannot be returned to the initial position, or the trigger 103a or the contact arm 141 is returned. Nevertheless, the trigger 103a or the contact arm 141 is set to be in an unsteady operation state when the on state of the switch operated by them remains maintained. And the detection apparatus which detects this is provided, and it is set as the structure which switches the air release valve | bulb 15 to the open side by a control apparatus based on the detection of the said detection apparatus.

[Modification 2]
In Modification 2, although not shown for convenience, the unsteady operation state of the internal mechanism is determined by the operation state of the compressor 130. Specifically, when the power transmission mechanism constituted by the gear reduction mechanism 113 that transmits the rotational output of the drive motor 111 to the compressor 130 or the crank mechanism 115 stops during operation, the compressor 130 operates unsteadily. Set to be in state. And the detection apparatus which detects this is provided, and it is set as the structure which switches the air release valve 151 to the open side by a control apparatus based on the detection of the said detection apparatus.

[Modification 3]
In modification 3, although illustration is omitted for convenience, the unsteady operation state of the internal mechanism is determined by the pressure value of the compression chamber 131a. Specifically, the pressure in the compression chamber 131a is set to be in an unsteady state when the pressure in the compression chamber 131a abnormally increases and the increased pressure reaches or exceeds a predetermined set pressure. . And the detection apparatus which detects this is provided, and it is set as the structure which switches the air release valve | bulb 15 to the open side by a control apparatus based on the detection of the said detection apparatus.

[Modification 4]
In Modification 3, although not shown for convenience, the unsteady operation state of the internal mechanism is determined by the operation state of the main valve 137. Specifically, the main valve 137 is set to be inoperative when the main valve 137 does not perform the opening operation at a timing at which the main valve 137 should originally perform the opening operation (a state where the compression piston 133 approaches the bottom dead center). And the detection apparatus which detects this is provided, and it is set as the structure which switches the air release valve 151 to the open side by a control apparatus based on the detection of the said detection apparatus.

[Modification 5]
In modification 5, although illustration is omitted for convenience, the unsteady operation state of the internal mechanism is determined by the temperature value of the internal mechanism. Specifically, when the temperature value of the compression device 130, drive motor 111, or battery pack 110 in the internal mechanism becomes abnormally high, the compression device 130, drive motor 111, or battery pack 110 is abnormal. Set to be in the correct state. And the detection apparatus which detects this is provided, and it is set as the structure which switches the air release valve 151 to the open side by a control apparatus based on the detection of the said detection apparatus. The temperature values of the compressor 130, the drive motor 111, or the battery pack 110 correspond to the “energy supply state” in the present invention.

[Modification 6]
In modification 6, although illustration is omitted for convenience, the unsteady operation state of the internal mechanism is determined by the current value or voltage value of the internal mechanism. Specifically, when the current value or voltage value supplied from the battery pack 110 to the drive motor 111 shows an abnormal value exceeding a predetermined set value, the battery pack 110 or the drive motor 111 Set to be in an abnormal state. And the detection apparatus which detects this is provided, and it is set as the structure which switches the air release valve 151 to the open side by a control apparatus based on the detection of the said detection apparatus. The current value or voltage value supplied from the battery pack 110 to the drive motor 111 corresponds to the “energy supply state” in the present invention.

  The air release valve 151 may be configured to switch when one of the above-described unsteady operation states of the internal mechanism is detected, or a plurality of unsteady operation states may be detected. You may comprise so that it may switch, when it is done.

100 nailing machine (driving tool)
101 Main Body 103 Handle 103a Trigger 103b Trigger Switch 103c Spindle 105 Magazine 107 Main Body Housing 109 Motor Housing 110 Battery Pack 111 Drive Motor (Motor)
113 gear reduction mechanism 115 crank mechanism 115a crankshaft 115b eccentric pin 115c connecting rod 120 nail driving mechanism 121 cylinder for impact
123 Stroke piston (piston)
124 Piston body (sliding part)
125 driver (driving part)
127 Relief hole 127a Check valve 130 Compressor 131 Compression cylinder 133 Compression piston 133a Piston body part 135 Communication path (compressed air supply path)
137 Main valve (opening / closing device)
139 Outside Air Supply Port 141 Driver Guide (Contact Arm)
141a Implanting passage 151 Air release valve 153 Air release passage

Claims (12)

A cylinder,
A piston provided with a sliding portion that is slidably accommodated in the cylinder, and a long driving portion that is provided on the sliding portion and drives a stopper;
Battery,
A motor driven by electric power supplied from the battery;
A compressor that is driven by the motor to generate compressed air by changing the volume of the compression chamber;
A compressed air supply path for supplying air in the compression chamber into the cylinder;
An opening and closing device for opening and closing the compressed air supply path;
A control member for controlling driving and stopping of the motor;
Have
Compressed air in the compression chamber compressed by the compression device is supplied into the cylinder through an opening operation of the opening / closing device, and the piston is moved linearly by the compressed air, and is driven by a driving portion of the piston. A driving tool for performing the driving operation of the stopper,
An air release path that communicates the inside of the compression chamber or cylinder and the atmosphere, and the atmosphere release path is provided with an atmosphere release valve that can switch between opening and closing of the atmosphere release path. Driving tool to do. The driving tool according to claim 1,
A driving tool for switching the atmosphere release valve according to a predetermined operation state of an internal mechanism defined by the battery, the motor, the compression device, the switching device, the piston, and the control member. The driving tool according to claim 2,
A driving tool comprising detecting means for detecting an operating state of the internal mechanism, and switching the atmosphere release valve when the detecting means detects a predetermined operating state of the internal mechanism. The driving tool according to claim 2,
The driving tool according to claim 1, wherein the predetermined operation state is determined by an operation state of the control member that controls driving and stopping of the motor. The driving tool according to claim 4,
The driving tool, wherein the control member is a trigger that energizes and drives the motor by a pulling operation by an operator and stops the motor by releasing the pulling operation. A driving tool according to claim 3, wherein
The driving tool according to claim 1, wherein the predetermined operation state is determined by an operation state of the compression device. A driving tool according to claim 3, wherein
The driving tool according to claim 1, wherein the predetermined operation state is determined by an operation state of the piston. The position setting tool according to claim 3,
The driving tool according to claim 1, wherein the predetermined operation state is determined by a pressure value of the compression chamber. A driving tool according to claim 3, wherein
The driving tool according to claim 1, wherein the predetermined operating state is determined by an operating state of the switchgear. A driving tool according to claim 3, wherein
The driving tool according to claim 1, wherein the predetermined operation state is determined by a supply state of energy to the compression device. A driving tool according to claim 3, wherein
The predetermined operation state is determined by a correlation state of a plurality of elements among the predetermined operation states defined in claims 4 and 6 to 10. The driving tool according to claim 1 or 2,
The driving tool according to claim 1, wherein the air release valve is a solenoid valve.

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