JP2016068221A - Driving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving machine which has a simplified configuration, a light weight and a good usability.SOLUTION: A driving machine is equipped with: a housing; a driving source which is accommodated in the housing, has an output shaft and rotates the output shaft; a nose part provided with a launching hole for launching a fastener; a move part which strikes the fastener by movement in a striking direction in a reciprocation direction in the housing; a drive transmission mechanism which moves the move part in a direction opposite to the striking direction by rotation of the output shaft; an energy accumulation part which accumulates an energy by movement of the move part in the direction opposite to the striking direction and moves the move part in the striking direction by releasing the energy; and clutch mechanism which selectively blocks connection between the output shaft and the drive transmission mechanism. The drive transmission mechanism has a rack part which is fixed to the move part, and a gear part which engages with the rack part and moves the move part in the direction opposite to the striking direction via the rack part by rotation of itself, and the clutch mechanism blocks connection between the output shaft and the drive transmission mechanism after the drive transmission mechanism moves the move part in the direction opposite to the striking direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a driving machine, and more particularly to an electric driving machine.

  Conventionally, a driving machine for driving a stopper into a workpiece is widely used. In such a driving machine, the driving machine includes a motor, a flywheel, a driven rotary shaft, a pinion coaxially fixed to the driven rotary shaft, and a driver having a rack that meshes with the pinion. A machine is known (Patent Document 1). In the driving machine, rotational energy is accumulated in the flywheel by driving the motor, the rotational energy is transmitted to the driven rotating shaft, the driven rotating shaft is rotated at high speed, and the rotation of the pinion of the driven rotating shaft is transmitted through the rack. It is transmitted to the drive element, and the drive element is moved at high speed to hit the stopper.

JP 2007-118135 A

  However, in the above-described driving machine, the rotational energy accumulated in the flywheel is transmitted to the driven rotating shaft, and the driving element is moved at a high speed to drive the stopper. There is a problem that parts are necessary and the structure becomes complicated.

  Therefore, an object of the present invention is to provide a driving machine that has a simplified structure and is light and easy to use.

  In order to solve the above-described problems, the present invention provides a housing, a drive source that is housed in the housing and has an output shaft, and rotates the output shaft, and a nose portion in which a punch hole for punching a stop is formed, A moving part provided in the housing so as to be capable of reciprocating and striking the stopper located at the nose part by movement in the striking direction in the reciprocating direction, and counteracting the moving part by rotation of the output shaft A drive transmission mechanism that moves in a direction, energy is accumulated by movement of the moving part in the counter-blowing direction, and energy storage that moves the moving part in the striking direction by releasing the accumulated energy, and the output A clutch mechanism that selectively cuts off the connection between the shaft and the drive transmission mechanism, the drive transmission mechanism extending along the reciprocating direction, a rack portion fixed to the moving portion, and the rack portion Engage the Hauge A gear portion that is rotatably supported by the gear and moves the moving portion in the counter-blowing direction through the rack portion by its own rotation. The clutch mechanism includes the drive transmission mechanism that moves the moving portion. Provided is a driving machine configured to disconnect the connection between the output shaft and the drive transmission mechanism after being moved in the counter-blowing direction.

  According to such a configuration, the drive transmission mechanism includes a rack portion and a gear portion that meshes with the rack portion, a so-called rack and pinion mechanism, and uses the rack and pinion mechanism to move the moving portion in the anti-blowing direction. Energy can be stored in the storage unit. Further, by disconnecting the connection between the output shaft and the drive transmission mechanism using the clutch mechanism, the accumulated energy can be released and the moving part can be moved in the striking direction. Accordingly, the configuration for storing energy in the energy storage unit and the configuration for moving the moving unit in the striking direction can be simplified, and the overall structure of the driving machine can be simplified. Furthermore, the structure which moves a moving part to a striking direction by interrupting | blocking the connection of a drive transmission mechanism and an output shaft using a clutch mechanism, ie, a connection of a moving part and another member, when moving a moving part below. Since the structure does not require itself, the structure can be simplified, and a light and easy-to-use driving machine can be realized.

  In the above-described configuration, the clutch mechanism has an engaging portion that is rotatably provided in the housing and can be engaged with the drive transmission mechanism, and the drive is performed by the engagement between the engagement portion and the drive transmission mechanism. Preferably, the transmission mechanism and the output shaft are connected, and the connection between the drive transmission mechanism and the output shaft is cut off by releasing the engagement between the engagement portion and the drive transmission mechanism. .

  According to such a configuration, the connection between the drive transmission mechanism and the output shaft and the disconnection of the connection can be realized by a simple operation of engaging and releasing the engagement portion with the drive transmission mechanism. Thereby, the structure of a clutch mechanism can be simplified and the structure of the whole driving machine can be simplified.

  Further, it is preferable that the clutch mechanism has a rotation support shaft that is rotatably provided in the housing and rotates the engagement portion by its own rotation.

  According to such a configuration, the engaging portion can be rotated with a simple configuration of rotating the rotation support shaft.

  The rotational support shaft increases its rotational torque as the moving portion moves in the counter-blowing direction, and the engaging portion is provided to be movable in the axial direction of the rotational support shaft. When the rotational torque exceeds a predetermined value, the movement starts in the separating direction away from the drive transmission mechanism in the axial direction, and the engagement between the engagement portion and the drive transmission mechanism is the engagement It is preferable to be configured to be released by the movement of the part in the separating direction.

  According to such a configuration, by adjusting the predetermined value, it is possible to adjust the distance that the moving unit moves in the anti-blowing direction before the engagement between the engaging unit and the drive transmission mechanism is released. . Thereby, the movement distance (striking stroke) at the time of driving | running | working of a moving part can be adjusted, in other words, the driving force of a driving machine can be adjusted and the freedom degree of design of a driving machine can be improved.

  Further, the clutch mechanism has a biasing portion that biases the engaging portion in the anti-separation direction, and a ball groove extending in a direction intersecting the axial direction is formed on the outer peripheral surface of the rotation support shaft. The engaging portion is provided on the rotation support shaft via a cam ball accommodated in the ball groove, and the cam ball moves along the ball groove against the urging force of the urging portion. The predetermined value is preferably dependent on the intersection angle between the ball groove and the axial direction.

  According to such a configuration, the predetermined value can be adjusted by a simple design change in which the intersection angle between the ball groove and the axial direction is changed. Thereby, the moving distance (striking stroke) at the time of driving of the moving part, that is, the driving force of the driving machine can be adjusted by a simple design change.

  Further, the clutch mechanism has a biasing portion that biases the engaging portion in the anti-separation direction, and the engaging portion is in contact with the drive transmission mechanism in a state of being engaged with the drive transmission mechanism. An inclined sliding surface that is in contact with and inclined with respect to the axial direction, and the inclined sliding surface slides against the drive transmission mechanism so as to move against the urging force of the urging portion in the separating direction. It is preferable that the predetermined value depends on an inclination angle of the inclined smooth surface with respect to the axial direction.

  According to such a configuration, the predetermined value can be adjusted by a simple design change in which the inclination angle of the inclined smooth surface with respect to the axial direction is changed. Thereby, the moving distance (striking stroke) at the time of driving of the moving part, that is, the driving force of the driving machine can be adjusted by a simple design change.

  The engaging portion is configured to rotate in a first rotation direction in order to move the moving portion in the counter-blowing direction in a state where the engaging portion and the drive transmission mechanism are engaged, Reverse rotation between the housing and the engagement portion that allows the engagement portion to rotate in the first rotation direction and restricts rotation in the second rotation direction opposite to the first rotation direction. It is preferable that a regulating mechanism is provided.

  According to such a configuration, since the reverse rotation restricting mechanism restricts the rotation of the engaging portion in the second rotation direction, the engaging portion is in the second rotation direction while the engaging portion and the drive transmission mechanism are engaged. It is possible to prevent the moving part from moving in the striking direction while driving the stopper and driving the stopper. Thereby, the finishing degree can be maintained well and the workability can be improved.

  The rotation support shaft is configured to rotate in a first rotation direction in order to move the moving portion in the counter-blowing direction in a state where the engagement portion and the drive transmission mechanism are engaged, Reverse rotation between the housing and the rotation support shaft that allows rotation of the rotation support shaft in the first rotation direction and restricts rotation in the second rotation direction opposite to the first rotation direction. It is preferable that a regulating mechanism is provided.

  According to such a configuration, since the reverse rotation restricting mechanism restricts the rotation of the rotation support shaft in the second rotation direction, the engagement portion is in the second rotation direction with the engagement portion and the drive transmission mechanism engaged. It is possible to prevent the moving part from moving in the striking direction while driving the stopper and driving the stopper. Thereby, the finishing degree can be maintained well and the workability can be improved.

  The reverse rotation restricting mechanism preferably has a one-way clutch.

  According to such a configuration, the reverse rotation restricting mechanism can be realized by using a one-way clutch having a relatively simple configuration.

  In addition, the rack portion and the gear portion are configured so that the engagement between the rack portion and the gear portion is maintained even when the moving portion is in any position within the reciprocable range. It is preferable to be configured.

  According to such a configuration, since the meshing between the rack part and the gear part is always maintained regardless of the position of the moving part, the meshing between the rack part and the gear part and the release of the meshing are not repeated. . Thereby, the damage by the collision with the front-end | tip part of the tooth | gear of a rack part and the front-end | tip part of a gear part which may generate | occur | produce when it meshes again from the state which the said meshing was cancelled | released can be suppressed. Further, it is not necessary to finely adjust the positional relationship between the rack portion and the gear portion in order to avoid collision between the tip portions of the respective teeth when re-engaging.

  The clutch further includes a restricting portion that restricts the movement of the moving portion in the counter hitting direction, and the clutch mechanism connects the output shaft and the drive transmission mechanism after the moving portion abuts the restricting portion. It is preferable that it is comprised so that it may interrupt | block.

  According to such a configuration, the movement distance in the counter-blow direction of the moving part is restricted by the restricting part, and the connection between the output shaft and the drive transmission mechanism is interrupted after the moving part comes into contact with the restricting part. The moving distance (striking stroke) when driving the moving part, that is, the driving force of the driving machine can be kept constant. Thereby, the stability of work can be improved and the finishing degree of work can be made better.

  Further, a contact detection unit that detects a state in which the moving unit is in contact with the restricting unit, and a stop that stops the rotation of the output shaft when the contact between the moving unit and the restricting unit is released. And means.

  According to such a configuration, the rotation of the output shaft can be stopped when the clutch mechanism disconnects the connection between the output shaft and the drive transmission mechanism, that is, when the moving unit starts moving in the striking direction. Thereby, after the driving operation is completed, the rotating shaft 3A can continue to rotate, and the malfunctioning, that is, the double driving can be suppressed.

  According to the driving machine of the present invention, it is possible to provide a driving machine that has a simplified structure and is light and easy to use.

It is a partial cross section side view which shows the internal structure of the whole nail driver by the 1st Embodiment of this invention, and is a figure which shows the state in which the moving part is located in a top dead center. It is II-II sectional drawing of FIG. 4 which shows the front part of the nailing machine by the 1st Embodiment of this invention, and is a figure which shows the state in which the moving part is located in a top dead center. It is the elements on larger scale of FIG. 1 which shows the clutch mechanism and drive part of the nailing machine by the 1st Embodiment of this invention. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 2 illustrating a striking unit and a driving unit of the nailing machine according to the first embodiment of the present invention, in which (a) is a case where the moving unit is located at a bottom dead center, (b) Indicates a case where the moving part is located at the top dead center. It is a figure which shows the clutch mechanism and drive part at the moment when the engaging part and engaged part of the nail driver by the 1st Embodiment of this invention engaged, (a) is a 1st cam ball, 2nd The figure which shows the positional relationship of a cam ball, an engaging nail | claw, and a to-be-engaged nail | claw, (b) is a top view which shows the external appearance of a clutch mechanism and a drive part, (c) is a partial cross-sectional top view which shows a clutch mechanism and a drive part. . It is a figure which shows the clutch mechanism and drive part of the state which the engaging part and drive part of the nail driver by the 1st Embodiment of this invention are rotating integrally, (a) is a 1st cam ball, 2 is a diagram showing the positional relationship between the cam ball, the engaging claw and the engaged claw, (b) is a top view showing the external appearance of the clutch mechanism and the drive unit, and (c) is a partial cross-sectional top view showing the clutch mechanism and the drive unit. is there. It is a figure which shows the clutch mechanism and drive part immediately before the engagement of the engaging part and drive part of the nail driver by the 1st Embodiment of this invention is cancelled | released, (a) is a 1st cam ball, The figure which shows the positional relationship of 2 cam ball | bowl, an engaging claw, and a to-be-engaged nail | claw, (b) is a top view which shows the external appearance of a clutch mechanism, (c) is a partial cross-sectional top view which shows a clutch mechanism. It is a partial cross section side view which shows the clutch mechanism and drive part of a nailing machine by the modification of the 1st Embodiment of this invention. It is a partial cross section side view which shows the internal structure of the whole nail driver by the 2nd Embodiment of this invention, and is a figure which shows the state in which the piston is located in a top dead center. FIG. 10 is a partially enlarged view of FIG. 9 showing a clutch mechanism, a drive unit, and a one-way clutch of a nailing machine according to a second embodiment of the present invention. It is a fragmentary sectional front view which shows the hit | damage part and drive part of the nail driver by the 2nd Embodiment of this invention, (a) is a case where a hit | damage part is located in a bottom dead center, (b) is a hit | damage part. When it is located between the bottom dead center and the top dead center, (c) shows the case where the hitting part is located at the top dead center. It is a figure which shows the clutch mechanism and drive part at the moment when the engaging part and engaged part of the nail driver by the 2nd Embodiment of this invention engaged, (a) is a 1st cam ball, 2nd The figure which shows the positional relationship of a cam ball, an engaging nail | claw, and a to-be-engaged nail | claw, (b) is a top view which shows the external appearance of a clutch mechanism and a drive part, (c) is a partial cross-sectional top view which shows a clutch mechanism and a drive part. . It is a figure which shows the clutch mechanism and drive part of the state which the engaging part and drive part of the nail driver by the 2nd Embodiment of this invention are rotating integrally, (a) is a 1st cam ball, 2 is a diagram showing the positional relationship between the cam ball, the engaging claw and the engaged claw, (b) is a top view showing the external appearance of the clutch mechanism and the drive unit, and (c) is a partial cross-sectional top view showing the clutch mechanism and the drive unit. is there. It is a figure which shows the clutch mechanism and drive part immediately before the engagement of the engaging part and drive part of the nailing machine by the 2nd Embodiment of this invention is cancelled | released, (a) is a 1st cam ball, The figure which shows the positional relationship of 2 cam ball | bowl, an engaging claw, and a to-be-engaged nail | claw, (b) is a top view which shows the external appearance of a clutch mechanism, (c) is a partial cross-sectional top view which shows a clutch mechanism. It is a partial expanded sectional view which shows the one-way clutch of the nailing machine by the 2nd Embodiment of this invention, and is a figure which shows the state which the one-way clutch has controlled reverse rotation of the engaging part. It is a figure which shows the clutch mechanism, drive part, and one-way clutch of the nailing machine by the modification of the 2nd Embodiment of this invention, (a) is a side view which shows an external appearance, (b) is a partial cross section side view. It is.

  Embodiments of the present invention will be described with reference to FIGS. In the following description, when a specific numerical value is mentioned, for example, when referring to “90 °” for an angle, “2000 rpm” for a rotational speed, “20 ms” for a time, etc., the numerical values are completely the same. Not only the case but also the case where it is substantially the same as the numerical value is included. In addition, when referring to the positional relationship, for example, when referring to parallel, orthogonal, opposite, etc., not only when it is completely parallel, orthogonal, opposite, etc., but also substantially parallel, substantially orthogonal, substantially opposite, etc. Including some cases.

  First, a nailing machine 1 which is an example of a driving machine according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 7.

  As shown in FIGS. 1 and 2, the nailing machine 1 includes a housing 2, a motor 3, a power transmission unit 4, a striking unit 5 having a piston 5A, a nose unit 6, and a magazine 7. I have. The nail driver 1 is an electric tool, and is a tool for driving the nail N into a material to be driven such as wood as the striking portion 5 moves from the top dead center to the bottom dead center at high speed. FIG. 1 is a partial cross-sectional side view showing the internal structure of the entire nailing machine 1, and shows a state where the piston 5A is located at the top dead center. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 4 showing the front portion of the nailing machine, and shows a state where the piston 5A is located at the bottom dead center. In FIG. 1, the direction in which the magazine 7 is provided with respect to the nose portion 6 is defined as the rear direction, and the direction opposite to the rear direction is defined as the front direction. The direction in which the magazine 7 is provided with respect to the motor 3 is defined as the downward direction, and the direction opposite to the downward direction is defined as the upward direction. Further, when the nailer 1 is viewed from the rear, the left is defined as the left direction, and the right is defined as the right direction.

  The housing 2 is a part forming the outline of the nailing machine 1 and is made of a resin such as nylon or polycarbonate. The housing 2 includes a handle portion 21, a motor housing portion 22, a rear connection portion 23, and a striking portion housing portion 24.

  The handle portion 21 is a portion that is gripped by the user when the nail driver 1 is used, and has a substantially cylindrical shape extending in the front-rear direction. The handle portion 21 includes a trigger 21A and a switch mechanism 21B. The trigger 21 </ b> A is a switch for operating the drive of the motor 3 and is provided below the front portion of the handle portion 21. The switch mechanism 21B is accommodated in the front portion inside the handle portion 21, and is turned on when the trigger 21A is pushed upward.

  The motor housing part 22 extends in the front-rear direction and includes the motor 3 and the power transmission part 4. The motor 3 is housed behind the motor housing 22 and has a rotating shaft 3A. The rotation shaft 3 </ b> A is a shaft extending in the front-rear direction and is rotated by driving of the motor 3. The motor 3 is an example of the drive source of the present invention, and the rotating shaft 3A is an example of the output shaft of the present invention.

  The power transmission unit 4 includes a speed reduction mechanism 41, a clutch mechanism 42, and a drive unit 43, and transmits the rotational force (power) of the rotating shaft 3 </ b> A of the motor 3 to the striking unit 5.

  The speed reduction mechanism 41 is a planetary gear mechanism that transmits the rotation of the rotation shaft 3 </ b> A to the clutch mechanism 42 at a rotation speed lower than the rotation speed, and is provided in front of the motor 3 inside the motor housing portion 22. The speed reduction mechanism 41 has a plurality of planetary gears arranged around the rotation shaft 3A and meshed with the rotation shaft 3A, a ring gear arranged coaxially with the rotation shaft 3A, and a carrier 41A provided coaxially with the rotation shaft 3A. doing. The carrier 41 </ b> A has a front end connected to the power transmission unit 4, and transmits the reduced rotation of the rotating shaft 3 </ b> A to the power transmission unit 4. Further, the carrier 41A rotates clockwise in front view as the motor 3 is driven and the rotation shaft 3A rotates. In the present embodiment, the speed reduction mechanism 41 is a multi-stage planetary gear mechanism, but may be a single-stage planetary gear mechanism.

  As shown in FIG. 3, the clutch mechanism 42 is provided in front of the speed reduction mechanism 41 inside the motor housing portion 22, and includes a rotation support shaft 44, a first cam ball 45, a second cam ball 46, A joining portion 47 and a spring 48 are provided. The clutch mechanism 42 is configured to transmit the rotation (rotational force) of the rotary shaft 3A to the drive unit 43 via the speed reduction mechanism 41 and to block the transmission. In other words, the clutch mechanism 42 is configured to be selectively switchable between a state in which the rotating shaft 3A of the motor 3 and the drive unit 43 are connected and a state in which the connection is cut off. FIG. 3 is a partially enlarged view of FIG. 1 showing the clutch mechanism 42 and the drive unit 43 of the nailing machine 1.

  The rotation support shaft 44 extends forward from the front end of the carrier 41A, and is supported by the ball bearing 22A so as to rotate integrally with the carrier 41A. The rotation support shaft 44 rotates in the rotation direction R (clockwise in front view) about the axis A shown in FIG. 3 by driving the motor 3, that is, rotation of the rotation shaft 3A. The rotation support shaft 44 has a first groove 44a and a second groove 44b.

  The first groove 44 a is formed so as to be recessed inward in the radial direction of the rotation support shaft 44 at approximately the center in the front-rear direction of the outer peripheral surface of the rotation support shaft 44. The first groove 44a is formed so as to go forward from the upstream side toward the downstream side in the rotation direction of the rotation support shaft 44 (clockwise in front view), and the axial center of the rotation support shaft 44 in the side view. It intersects the direction (the direction in which the axis A extends, the front-rear direction). The second groove 44 b has the same shape as the first groove 44 a and is formed on the outer peripheral surface of the rotation support shaft 44 at a symmetrical position with respect to the axis of the rotation support shaft 44. Each of the first groove 44a and the second groove 44b is an example of a ball groove of the present invention.

  The first cam ball 45 is a substantially spherical metal member, a part of which is accommodated in the first groove 44a, and is provided so as to be movable along the first groove 44a. The second cam ball 46 is a metal member having the same shape as the first cam ball 45, a part of which is accommodated in the second groove 44b, and is provided so as to be movable along the second groove 44b. Each of the first cam ball 45 and the second cam ball 46 is an example of the cam ball of the present invention.

  The engaging portion 47 is provided on the rotation support shaft 44 via the first cam ball 45 and the second cam ball 46, and includes a cylindrical portion 47A and an enlarged diameter portion 47B. Further, the engaging portion 47 can move relative to the rotation support shaft 44 by a predetermined amount in the front-rear direction, and can rotate relative to the predetermined amount. The cylindrical portion 47A has a cylindrical shape extending in the front-rear direction, and a first spline groove 47a and a second spline groove 47b that are recessed radially outward are formed on the inner wall thereof.

  The first spline groove 47a is a groove extending rearward from the front end of the inner peripheral surface of the cylindrical portion 47A, and is formed shorter than the longitudinal length of the cylindrical portion 47A. The first spline groove 47a accommodates a part of the first cam ball 45 and restricts relative movement between the cylindrical portion 47A and the first cam ball 45 in the rotation direction R. Further, when the rear end portion of the first spline groove 47a and the first cam ball 45 are in contact with each other (the state shown in FIG. 3), the forward movement of the cylindrical portion 47A with respect to the first cam ball 45 is restricted. The second spline groove 47b has the same shape as the first spline groove 47a, and is formed symmetrically with respect to the axial center (axis A) of the cylindrical portion 47A. The relationship between the second spline groove 47 b and the second cam ball 46 is the same as the relationship between the first spline groove 47 a and the first cam ball 45.

  The diameter-expanded portion 47B has a diameter increased radially outward from the outer peripheral surface of the front end portion of the cylindrical portion 47A, and is formed integrally with the cylindrical portion 47A. Further, the enlarged diameter portion 47B includes an engaging claw 47C. The engaging claw 47C protrudes forward from the front surface of the enlarged diameter portion 47B, and the downstream surface of the engaging claw 47C in the rotation direction R is configured to be engageable with the drive unit 43. Further, the length of the engagement claw 47C in the front-rear direction is configured to be shorter than the distance that the engagement portion 47 can move relative to the rotation support shaft 44 in the front-rear direction.

  The spring 48 is a compression coil spring extending in the front-rear direction, and is provided on the rotation support shaft 44 in a state compressed by a predetermined amount, and urges the engaging portion 47 forward. The rear end portion of the spring 48 is in contact with the front end surface of the carrier 41A, and the front end portion of the spring 48 is in contact with the rear end surface of the cylindrical portion 47A. The spring 48 is an example of an urging portion of the present invention.

  The drive part 43 is located in front of the clutch mechanism 42 inside the motor housing part 22 of the housing 2 and includes an engaged part 43A and a gear part 43B.

  The engaged portion 43A is a substantially cylindrical portion integrally formed with the gear portion 43B, and is rotatable relative to the rotation support shaft 44 on the rotation support shaft 44 via the ball bearing 22B and the bearing 22C. Is provided. The engaged portion 43A includes an engaged claw 43C.

  The engaged claw 43C protrudes rearward from the rear surface of the engaged portion 43A, and the upstream surface in the rotation direction R of the engaged claw 43C can engage with the engaging claw 47C of the engaging portion 47. It is configured. Further, the length of the engaged claw 43C in the front-rear direction is substantially equal to the length of the engagement claw 47C in the front-rear direction.

  The gear portion 43B has a substantially circular shape when viewed from the front, is formed integrally with the engaged portion 43A, and is supported on the rotation support shaft 44 via the ball bearing 22A so as to be rotatable together with the engaged portion 43A. ing. The gear portion 43B and the engaged portion 43A are configured so that the motor 3 is driven and the rotary shaft 3A rotates while the engaging claw 47C and the engaged claw 43C are engaged (the state shown in FIG. 3). It rotates integrally with the rotation direction R at the center. As shown in FIGS. 3 and 4, a tooth portion 43D is formed on the outer peripheral surface of the gear portion 43B, and meshes with a rack portion 5C of a rod 5B described later. 4 is a cross-sectional view taken along the line IV-IV in FIG. 2 showing the striking portion 5 and the drive portion 43. FIG. 4A is a view in which the striking portion 5 is located at the bottom dead center, and FIG. The case where it is located at the dead point is shown.

  As shown in FIG. 1, the rear connection portion 23 extends in the vertical direction, and connects the rear portion of the handle portion 21 and the rear portion of the motor housing portion 22. The rear connection unit 23 includes a control unit 23A and a power supply connection unit 23B. The control unit 23A is a flat substrate including an electric circuit (not shown) and a switching element such as an FET, and is accommodated in the rear connection unit 23. The control unit 23A is connected to the motor 3, the switch mechanism 21B, and a position detection unit 25B described later, and controls the motor 3 based on signals output from the switch mechanism 21B and the position detection unit 25B.

  The power supply connection portion 23B is formed to extend in the vertical direction on the rear surface of the rear connection portion 23, and the battery pack P can be attached thereto. The battery pack P has a plurality of secondary battery cells serving as power sources for the motor 3 therein. The power supply connection unit 23B is configured to be able to supply the power of the secondary battery cell to the motor 3 and the control unit 23A in a state where the battery pack P is mounted.

  As shown in FIGS. 1, 2, and 4, the striking portion accommodating portion 24 extends in the vertical direction and is connected to the front portion of the handle portion 21 and the front portion of the motor accommodating portion 22. The hitting portion accommodating portion 24 includes a cylinder 25, a piston bumper 26, and the hitting portion 5. In addition, a pressure accumulating chamber 24 a is defined inside the striking part accommodating part 24.

  The cylinder 25 is disposed inside the striking part accommodating part 24, has a substantially circular tube shape extending in the vertical direction, and includes a movement restricting part 25A and a position detecting part 25B. The cylinder 25 guides the movement of the piston 5A described later in the vertical direction and restricts the movement of the piston 5A in a direction other than the vertical direction. The vertical direction is an example of the reciprocating direction of the present invention.

  The movement restricting portion 25A is formed so as to protrude inward in the radial direction of the cylinder 25 from the inner surface of the upper end portion of the cylinder 25, and has a ring shape when viewed from above. The inner diameter of the movement restricting portion 25A is smaller than the inner diameter of the portion of the cylinder 25 where the movement restricting portion 25A is not formed, and restricts the upward movement of the piston 5A. The movement restricting portion 25A is an example of a restricting portion of the present invention.

  The position detection unit 25B is a micro switch that detects that the striking unit 5 is located at the top dead center, that is, the piston 5A is in contact with the movement restricting unit 25A, and is provided at the upper end of the cylinder 25. It has been. The position detection unit 25B has an arm part 25C that can come into contact with the striking part 5, and is turned on when the arm part 25C is in contact with the striking part 5 and pushed up. The position detection unit 25B continues to output a signal to the control unit 23A while in the on state. The position detection unit 25B is an example of a contact detection unit of the present invention.

  The piston bumper 26 is a cushioning material provided at the lower end of the cylinder 25. When the piston 5A moves downward during driving, the piston bumper 26 abuts on the piston 5A and is compressed to absorb the impact. Further, the piston bumper 26 restricts the downward movement of the piston 5A.

  The striking part 5 is a member that moves downward, strikes the nail N and drives the nail N into the material to be driven, and includes a piston 5A, a rod 5B, and a rack part 5C. The piston 5A has a shape in which a lower portion of a cylindrical portion extending in the vertical direction is closed, and can reciprocate between a top dead center located at the upper end of the cylinder 25 and a bottom dead center located at the bottom. Are supported in the cylinder 25. The cylindrical portion of the piston 5A is formed with a protrusion 5D that pushes up the arm portion 25C of the position detection portion 25B when the piston 5A is located at the top dead center. An O-ring (not shown) is provided on the outer peripheral surface of the piston 5A. The O-ring blocks communication between the upper space and the lower space of the piston 5A in the cylinder 25. The lower part is an example of the striking direction of the present invention, and the upper part is an example of the counter striking direction. The nail N is an example of the fastener of the present invention.

  The rod 5B is a rod-like member extending downward from the bottom surface of the piston 5A, and is configured to reciprocate between the top dead center and the bottom dead center integrally with the piston 5A. The nail N arranged in the nose portion 6 is hit by the movement, that is, the downward movement. The lower end portion of the rod 5B is positioned above the nose portion 6 in a state where the hitting portion 5 is located at the top dead center, that is, in a state where the piston 5A is located at the top dead center (the state shown in FIG. 1). In the state located at the dead center, that is, the state where the piston 5A is located at the bottom dead center (the state shown in FIG. 2), the piston 5A is configured to slightly protrude below the lower end of the nose portion 6. Piston 5A and rod 5B are an example of the moving part of the present invention.

  The rack portion 5C is a portion extending along the vertical direction fixed to the rear portion of the rod 5B, and meshes with the tooth portion 43D of the gear portion 43B. The rack portion 5C constitutes a so-called rack and pinion together with the gear portion 43B. The rack portion 5C moves toward the top dead center (upward) integrally with the rod 5B and the piston 5A as the driving portion 43 rotates in the rotation direction R. That is, the hitting unit 5 moves to the top dead center by the rotation of the driving unit 43 in the rotation direction R. Further, the meshing between the rack portion 5C and the tooth portion 43D of the gear portion 43B is in any position where the striking portion 5 is movable (in any position from the top dead center to the bottom dead center). Even so, it is configured to be maintained. The rack part 5C and the drive part 43 function as a drive transmission mechanism of the present invention.

  The pressure accumulating chamber 24 a is formed above the cylinder 25 in the striking part accommodating part 24. The pressure accumulating chamber 24a communicates with the space above the piston 5A in the cylinder 25 and defines a space integral with the space. The pressure accumulation chamber 24a is filled with a compressed gas such as nitrogen, and the gas is compressed when the piston 5A moves upward. That is, energy is accumulated in the pressure accumulating chamber 24a by the upward movement of the striking portion 5, and the striking portion 5 is urged downward and moved at a high speed by releasing the accumulated energy. The pressure accumulating chamber 24a is an example of the energy storage unit of the present invention.

  The nose portion 6 is provided extending downward from the lower end of the hitting portion accommodating portion 24, and a punching hole 6a extending in the vertical direction is formed in the nose portion 6. The launch hole 6a is configured such that the nail N can be accommodated and the rod 5B and the rack portion 5C can be inserted therethrough. The nail N accommodated in the ejection hole 6a is struck by the rod 5B and ejected from the lower end of the ejection hole 6a.

  The magazine 7 extends rearward from the rear portion of the nose portion 6 below the housing 2 and is provided so as to connect the nose portion 6 and the rear portion of the motor housing portion 22. A plurality of nails N are incorporated in the magazine 7 in a bundle shape, and the nails N are supplied into the ejection holes 6 a of the nose portion 6.

  Next, the driving operation of the nail driver 1 will be described.

  When the user presses the trigger 21A upward with the lower end of the nose 6 pressed against the workpiece, power is supplied from the battery pack P to the motor 3, and the rotating shaft 3A of the motor 3 starts rotating. To do. When the rotation shaft 3A starts rotating, the rotation (rotational force) of the rotation shaft 3A is transmitted to the rotation support shaft 44 via the speed reduction mechanism 41, and the rotation support shaft 44 starts rotating in the rotation direction R around the axis A. To do. When the rotation shaft 3A starts rotating, that is, in the initial state, the striking portion 5 is located at the bottom dead center as shown in FIGS. 2 and 4A.

  When the rotation support shaft 44 rotates, each of the first cam ball 45 and the second cam ball 46 rotates in the rotation direction R from the respective upstream edge in the rotation direction R of the first groove 44a and the second groove 44b of the rotation support shaft 44. (A force for rotating each of the first cam ball 45 and the second cam ball 46 in the rotation direction R) and the rotation support shaft 44 and the engaging portion 47 integrally with the axis A in the rotation direction R. Rotate. At this time, each of the first cam ball 45 and the second cam ball 46 receives the force in the rotation direction R from the upstream edge of each of the first groove 44a and the second groove 44b, and at the same time, receives the rotational torque of the rotation support shaft 44. A backward force corresponding to the magnitude (force for moving the first cam ball 45 and the second cam ball 46 rearward) is also received. However, since the first cam ball 45 and the second cam ball 46 are biased forward by the spring 48 via the engaging portion 47, they are not displaced in the front-rear direction.

  When the rotation support shaft 44, the first cam ball 45, the second cam ball 46, and the engaging portion 47 rotate together, the engaging claws 47C of the engaging portion 47 as shown in FIGS. 5 (a) to 5 (c). Is in contact with and engaged with the engaged claw 43C of the engaged portion 43A. That is, when the rotating shaft 3A starts rotating and enters the state of FIG. 5, the rotating shaft 3A of the motor 3 and the drive unit 43 are connected. In this state, the engaging claw 47C and the engaged claw 43C are located to the left of the axis A. 5 is a diagram showing the clutch mechanism 42 and the drive unit 43 at the moment when the engaging portion 47 and the engaged portion 43A are engaged. FIG. 5A shows the first cam ball 45, the second cam ball 46, and the engagement portion. The figure which shows the positional relationship of the nail | claw 47C and the to-be-engaged nail | claw 43C, (b) is a top view which shows the external appearance of the clutch mechanism 42 and the drive part 43, (c) is a partial cross-section upper surface which shows the clutch mechanism 42 and the drive part 43 FIG.

  The rotation support shaft 44, the first cam ball 45, the second cam ball 46, and the engagement portion in a state where the engagement claw 47C and the engagement claw 43C are engaged (the rotation shaft 3A and the drive portion 43 are connected). When 47 rotates integrally, the gear part 43B of the drive part 43 rotates in the rotation direction R integrally with the engaging part 47. When the drive part 43 rotates in the rotation direction R, the rack part 5C meshing with the gear part 43B is pushed up as shown in FIGS. 6A to 6C, and the entire striking part 5 moves upward. To do. In this state, since the striking portion 5 is moved upward, the gas sealed in the pressure accumulating chamber 24a is compressed and energy is accumulated in the pressure accumulating chamber 24a to some extent. For this reason, compared with the state of FIG. 5, the force which urges | biases the striking part 5 below becomes large, and the engaging part 47 is made to rotate through the rack part 5C and the drive part 43 with the increase in the said urging | biasing force. The force to rotate in the reverse direction of R also increases, and the rotational torque of the rotation support shaft 44 also increases. That is, the rotational torque of the rotation support shaft 44 increases as the piston 5A moves upward. At this time, as the rotational torque of the rotation support shaft 44 increases, the backward force received by the first cam ball 45 and the second cam ball 46 also increases, but does not exceed the forward biasing force of the spring 48. Even in this state, the positions of the first cam ball 45 and the second cam ball 46 in the front-rear direction are not displaced. FIG. 6 is a view showing the clutch mechanism 42 and the drive unit 43 in a state where the engaging portion 47 and the drive unit 43 are rotated together, and FIG. 6A is a diagram illustrating the first cam ball 45 and the second cam ball 46. The figure which shows the positional relationship of the engaging claw 47C and the to-be-engaged claw 43C, (b) is a top view which shows the external appearance of the clutch mechanism 42 and the drive part 43, (c) is the part which shows the clutch mechanism 42 and the drive part 43 It is a cross-sectional top view.

  When the engaging portion 47 and the drive portion 43 (gear portion 43B) are further rotated in the rotation direction R from the state of FIG. 6, the striking portion 5 is further moved upward, and the gas sealed in the pressure accumulating chamber 24a is further increased. The rotation torque of the rotation support shaft 44 is further increased due to the compression. When the engaging portion 47 and the driving portion 43 are slightly rotated from the state shown in FIG. 6, after the rotational torque of the rotation support shaft 44 exceeds a predetermined value and the first cam ball 45 and the second cam ball 46 receive. The directional force exceeds the forward biasing force of the spring 48. When the rearward force exceeds the urging force of the spring 48, the first cam ball 45 and the second cam ball 46 move along the first groove 44a and the second groove 44b, and the first cam ball 45, The second cam ball 46 and the engaging portion 47 are integrally rotated while moving backward against the urging force of the spring 48. The predetermined value described above depends on the intersection angle between the first groove 44a and the second groove 44b and the axis A, the spring constant of the spring 48, and the like.

  Even after the rotational torque of the rotation support shaft 44 exceeds a predetermined value, when the engaging portion 47 and the drive portion 43 are integrally rotated in the rotational direction R, the states of FIGS. 7A to 7C are obtained. In this state, the first cam ball 45, the second cam ball 46, and the engaging portion 47 are rotated by 270 ° in the rotation direction R from the state of FIG. 5, and the rotation support shaft 44 is rotated by 315 ° from the state of FIG. The first cam ball 45, the second cam ball 46, and the engaging portion 47 move rearward, and the engaging claw 47C and the engaged claw 43C are slightly engaged. In this state, the striking part 5 reaches top dead center and the piston 5A comes into contact with the movement restricting part 25A (the state shown in FIGS. 1 and 4B), and the gas sealed in the pressure accumulating chamber 24a is The energy that is compressed and accumulated further than the state of FIG. 6 is maximized. At this time, the protrusion 5D of the piston 5A is in a state where the arm portion 25C of the position detection unit 25B is pushed upward, and the position detection unit 25B is in contact with the control unit 23A and the piston 5A is in contact with the movement restriction unit 25A (blow The signal which shows that the part 5 is located in a top dead center is output. FIG. 7 is a diagram illustrating the clutch mechanism 42 and the drive unit 43 immediately before the engagement between the engagement unit 47 and the drive unit 43 is released. FIG. 7A illustrates the first cam ball 45, the second cam ball 46, and the engagement. The figure which shows the positional relationship of the joint nail | claw 47C and the to-be-engaged nail | claw 43C, (b) is a top view which shows the external appearance of the clutch mechanism 42, (c) is a partial cross-section top view which shows the clutch mechanism 42.

  After the state of FIG. 7 is reached, that is, after the piston 5A of the striking part 5 comes into contact with the movement restricting part 25A, the striking part 5 cannot move upward from that state, so the rack part 5C of the striking part 5 The gear part 43B meshing with the rotation direction R cannot be rotated. For this reason, when the engaging portion 47 and the drive portion 43 do not rotate from the state of FIG. 7 and only the rotation support shaft 44 further rotates in the rotation direction R, the rotation torque of the rotation support shaft 44 becomes maximum, and the first cam ball 45, The second cam ball 46 and the engaging portion 47 move further rearward than the state of FIG. 7, and the engagement between the engaging claw 47C and the engaged claw 43C, that is, the connection between the rotating shaft 3A and the driving portion 43 is cut off. Is done. At this time, the rotation support shaft 44 is rotated 320 degrees from the state of FIG. Further, the timing of releasing the engagement between the engaging claw 47C and the engaged claw 43C is the predetermined value of the rotational torque of the rotation support shaft 44 described above, and the length of the engaging claw 47C and the engaged claw 43C in the front-rear direction. It is determined by etc. The backward direction is an example of the separation direction of the present invention, and the forward direction is an example of the anti-separation direction of the present invention.

  When the engagement between the engaging claw 47C and the engaged claw 43C is released, the drive unit 43 can rotate in the reverse direction of the rotation direction R and the rack unit 5C can move downward, and the striking unit 5 is urged downward by the gas whose pressure is increased to the maximum in the pressure accumulating chamber 24a, and moves downward while accelerating. In other words, the energy accumulated in the pressure accumulating chamber 24a is released by disconnecting the connection between the rotating shaft 3A of the motor 3 and the drive unit 43, and the striking unit 5 moves downward.

  When the striking portion 5 moves downward from the top dead center, the nail N accommodated in the launching hole 6a of the nose portion 6 is hit by the striking portion 5 and driven in the direction of the driven material, and the nail is applied to the driven material. N is driven. When the driving is finished, the hitting unit 5 returns to the bottom dead center (the state shown in FIGS. 2 and 4A). Moreover, the drive part 43 rotates in the reverse direction of the rotation direction R from the state of FIG. 7 with the movement from the top dead center to the bottom dead center of the hit | damage part 5, and returns to the state of FIG.

  When the engagement between the engaging claw 47C and the engaged claw 43C is released, the engaging claw 47C released from the engagement with the engaged claw 43C is substantially simultaneously with the downward movement of the hitting portion 5. Overcoming the engaged claw 43C, the engaging portion 47, the first cam ball 45, and the second cam ball 46 move together while rotating in the rotation direction R by the forward biasing force of the spring 48. The movement stops at a position where each of the first cam ball 45 and the second cam ball 46 comes into contact with the front end of each of the first groove 44a and the second groove 44b. Further, at this time, the contact between the arm portion 25C of the position detection unit 25B and the projection 5D of the piston 5A is released, and the position detection unit 25B is turned off to stop signal output to the control unit 23A. The control unit 23A detects that the signal input from the position detection unit 25B has changed to a state in which there is no signal input, that is, detects that the striking unit 5 has started moving from the top dead center to the bottom dead center, The drive of the motor 3 is stopped and the rotation of the rotating shaft 3A is stopped. After the driving of the motor 3 is stopped, the rotating shaft 3A and the rotating support shaft 44 are slightly rotated by the inertial force, and stop rotating in a state rotated from 325 ° to 335 ° from the state of FIG. The controller 23A functions as a stopping unit of the present invention.

  As described above, the nail driver 1 that is the driving machine according to the first embodiment of the present invention includes the rack portion 5C and the gear portion 43B that meshes with the rack portion 5C, in other words, a so-called rack and pinion mechanism. The rotation of the rotating shaft 3A rotates the gear portion 43B, and the rotation of the gear portion 43B moves the piston 5A and the rod 5B upward (counter striking direction) via the rack portion 5C to enter the pressure accumulating chamber 24a. Energy can be stored. Further, by disconnecting the connection between the rotary shaft 3A and the drive unit 43 using the clutch mechanism 42, the energy accumulated in the pressure accumulating chamber 24a is released and the piston 5A and the rod 5B are moved downward (in the striking direction). Can do. Accordingly, the configuration for accumulating energy in the pressure accumulating chamber 24a and the configuration for moving the piston 5A and the rod 5B downward can be simplified, and the overall structure of the nail driver 1 can be simplified. . Furthermore, the piston 5A and the rod 5B are moved downward by blocking the connection between the rotary shaft 3A and the drive unit 43 using the clutch mechanism 42, that is, the piston 5A is moved when the piston 5A and the rod 5B are moved downward. In addition, since the connection between the rod 5B and the other member is not required, a complicated mechanism for moving the piston 5A and the rod 5B downward by suddenly connecting the other member to the piston 5A and the rod 5B is necessary. In addition, the structure of the nailing machine 1 can be simplified and the weight can be reduced.

  Further, the clutch mechanism 42 of the nail driver 1 connects the drive unit 43 and the rotary shaft 3 </ b> A by the engagement of the engagement unit 47 and the drive unit 43, and the engagement of the engagement unit 47 and the drive unit 43. Since the connection between the drive unit 43 and the rotating shaft 3A is cut off by the release, the drive unit 43 and the drive unit 43 can be simply operated by engaging and releasing the engagement unit 47 and the drive unit 43. Connection to the rotating shaft 3A and interruption of the connection can be realized. Thereby, the structure of the clutch mechanism 42 can be simplified and the structure of the whole nail driver 1 can be simplified.

  Further, the clutch mechanism 42 of the nailing machine 1 has a rotation support shaft 44 that is rotatably provided in the housing 2 and rotates the engaging portion 47 by its own rotation, so that the rotation support shaft 44 is rotated. The engaging portion 47 can be rotated with a simple configuration.

  Further, in the nailing machine 1, the rotation support shaft 44 increases the rotation torque of the rotation support shaft 44 as the piston 5A and the rod 5B move upward, and the engaging portion 47 is movable in the axis A (front-rear direction). When the rotational torque of the rotation support shaft 44 exceeds a predetermined value, the movement starts in the rear direction (separation direction) away from the drive unit 43 in the axis A (front-rear direction), and the engagement portion The engagement between the engagement portion 47 and the drive portion 43 is configured to be released by the rearward movement of the engagement portion 47. For this reason, by adjusting the predetermined value, it is possible to adjust the distance that the piston 5A and the rod 5B move upward until the engagement between the engagement portion 47 and the drive portion 43 is released. Thereby, the movement distance (striking stroke) at the time of driving of the piston 5A and the rod 5B can be adjusted, in other words, the driving force of the nail driver 1 can be adjusted, and the design freedom of the nail driver 1 can be improved. be able to.

  Further, in the nail driver 1, the clutch mechanism 42 includes a spring 48 that urges the engaging portion 47 in the forward direction (counter-separating direction), and the rotation support shaft 44 extends in a direction intersecting the axis A. A groove 44a and a second groove 44b are formed on the outer peripheral surface, and the engaging portion 47 is a rotation support shaft via a first cam ball 45 accommodated in the first groove 44a and a second cam ball 46 accommodated in the second groove 44b. 44, and the first cam ball 45 and the second cam ball 46 move rearward (separating direction) against the biasing force of the spring 48 by moving along the first groove 44a and the second groove 44b, respectively. The predetermined value described above depends on the angle of intersection between the first groove 44a and the second groove 44b and the axis A. Therefore, the predetermined value can be adjusted by a simple design change in which the intersection angle between the first groove 44a and the second groove 44b and the axis A is changed. Thereby, the moving distance (blow stroke) at the time of driving of the piston 5A and the rod 5B, that is, the driving force of the nail driver 1, can be adjusted by a simple design change.

  Further, in the nailing machine 1, the rack portion 5C and the gear portion 43B are arranged in a range where the piston 5A and the rod 5B can reciprocate, that is, in any position between the top dead center and the bottom dead center. Since the engagement between the portion 5C and the gear portion 43B is maintained, the engagement between the rack portion 5C and the gear portion 43B is always maintained regardless of the positions of the piston 5A and the rod 5B. The meshing with the gear part 43B and the release of the meshing are not repeated. Thereby, the collision with the front-end | tip part of the tooth | gear of the rack part 5C and the front-end | tip of the gear part 43B which can generate | occur | produce when it meshes | engages again from the state which the said mesh | engagement was cancelled | released can be suppressed. Further, it is not necessary to finely adjust the positional relationship between the rack portion 5C and the gear portion 43B in order to avoid collision between the tip portions of the respective teeth when re-engaging.

  The nail driver 1 includes a movement restricting portion 25A that restricts the upward movement of the piston 5A and the rod 5B, and the movement restricting portion 25A restricts the upward movement distance of the piston 5A and the rod 5B. In addition, since the connection between the rotary shaft 3A and the drive unit 43 is interrupted after the piston 5A comes into contact with the movement restricting portion 25A, the movement distance (striking stroke) when the piston 5A and the rod 5B are driven, that is, a nail driver The driving force of 1 can be kept constant. Thereby, the stability of work can be improved and the finishing degree of work can be made better.

  Further, the nail driver 1 is configured such that the position detection unit 25B that detects a state in which the piston 5A is in contact with the movement restricting unit 25A and the contact between the piston 5A and the movement restricting unit 25A are released. And the control unit 23A for stopping the rotation of the clutch, so that the clutch mechanism 42 rotates when the connection between the rotary shaft 3A and the drive unit 43 is cut off, that is, when the piston 5A and the rod 5B start moving downward. The rotation of the shaft 3A can be stopped. Thereby, after the driving operation is completed, the rotating shaft 3A can continue to rotate, and the malfunctioning, that is, the double driving can be suppressed.

  Next, a nailing machine which is a driving machine according to a modification of the first embodiment of the present invention will be described with reference to FIG. A nailing machine, which is a driving machine according to a modification of the first embodiment, includes a clutch mechanism 142 and a driving unit 143 in place of the clutch mechanism 42 and the driving unit 43 included in the nail driving machine 1. . The configuration of the nail driver according to the modification of the first embodiment of the present invention other than the clutch mechanism 142 and the drive unit 143 is the same as that of the nail driver 1 according to the first embodiment. Similarly, operations other than the operation of the clutch mechanism 142 and the drive unit 143 are the same as those of the nail driver 1. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. FIG. 8 is a partial cross-sectional side view showing the clutch mechanism 142 and the drive unit 143.

  As shown in FIG. 8, the clutch mechanism 142 is provided in front of the speed reduction mechanism 41 inside the motor housing portion 22, and includes a rotation support shaft 144, an engagement portion 147, and a spring 148. . The clutch mechanism 142 is configured to transmit the rotation (rotational force) of the rotation shaft 3A of the motor 3 to the drive unit 143 via the speed reduction mechanism 41 and to block the transmission. In other words, the clutch mechanism 142 is configured to be selectively switchable between a state where the rotating shaft 3A and the drive unit 143 are connected and a state where the connection is cut off.

  The rotation support shaft 144 is a shaft extending forward from the front end of the carrier 41A, and is supported by the ball bearing 22A so as to rotate integrally with the carrier 41A. The rotation support shaft 144 rotates in the rotation direction R (clockwise in front view) about the axis A shown in FIG. 8 by the rotation of the rotation shaft 3A of the motor 3. In addition, a spline groove 144 a that extends in the front-rear direction and is recessed inward in the radial direction of the rotation support shaft 144 is formed on the outer peripheral surface of the rotation support shaft 144.

  The engaging portion 147 is provided on the rotation support shaft 144 and includes a cylindrical portion 147A and a diameter-expanded portion 147B. Further, the engaging portion 147 can move relative to the rotation support shaft 144 by a predetermined amount in the front-rear direction and cannot rotate relative to the rotation support shaft 144. The cylindrical portion 147A has a cylindrical shape extending in the front-rear direction, and has a protruding portion 147C. The protruding portion 147C is formed so as to protrude radially inward (toward the axis A) from the inner wall of the cylindrical portion 147A and extend in the front-rear direction, and is engaged with the spline groove 144a of the rotation support shaft 144. . By this engagement, relative rotation of the cylindrical portion 147A with respect to the rotation support shaft 144 is restricted.

  The enlarged diameter portion 147B is enlarged radially outward from the outer peripheral surface of the front end portion of the cylindrical portion 147A, and is formed integrally with the cylindrical portion 147A. Further, the enlarged diameter portion 147B includes an engagement protrusion 147D. The engagement protrusion 147D protrudes forward from the front surface of the enlarged diameter portion 147B, and includes an engagement inclined surface 147F that can engage with the orthogonal surface 147E and the drive portion 143. The orthogonal surface 147E is a front end surface of the engagement protrusion 147D and is a surface orthogonal to the axis A. The engagement inclined surface 147F is a surface that is continuous with the downstream edge portion of the orthogonal surface 147E in the rotation direction R, and is an inclined surface that is inclined backward from the upstream side to the downstream side in the rotation direction R. The length of the engagement protrusion 147D in the front-rear direction is configured to be shorter than the distance that the engagement portion 147 can move relative to the rotation support shaft 144 in the front-rear direction. The engagement inclined surface 147F is an example of the inclined smooth surface of the present invention.

  The spring 148 is a compression coil spring extending in the front-rear direction, and is provided on the rotation support shaft 144 in a compressed state by a predetermined amount, and biases the engaging portion 147 forward. The rear end portion of the spring 148 is in contact with the front end surface of the carrier 41A, and the front end portion of the spring 148 is in contact with the rear end surface of the cylindrical portion 147A. The spring 148 is an example of an urging portion of the present invention.

  The drive part 143 is located in front of the clutch mechanism 142 inside the motor housing part 22 of the housing 2, and includes an engaged part 143A and a gear part 143B.

  The engaged portion 143A is a substantially cylindrical portion formed integrally with the gear portion 143B, and is rotatable relative to the rotation support shaft 144 on the rotation support shaft 144 via the ball bearing 22B and the bearing 22C. Is provided. The engaged portion 143A includes an engaged protrusion 143C.

  The engaged projection 143C protrudes rearward from the rear surface of the engaged portion 143A, and includes an engaged inclined surface 143F that can engage with the opposing inclined surface 143E and the engaging inclined surface 147F of the engaging protrusion 147D. . The facing surface 143E is a rear end surface of the engaged protrusion 143C, is a surface that faces the engaging portion 147 and is orthogonal to the axis A. The engaged inclined surface 143F is a surface that is continuous with the upstream edge portion of the facing surface 143E in the rotation direction R, and is an inclined surface that is inclined forward from the downstream side in the rotation direction R toward the upstream side. The engaged inclined surface 143 </ b> F is configured to be engageable with the engaging protrusion 147 </ b> D of the engaging portion 147. The length in the front-rear direction of the engaged protrusion 143C is substantially equal to the length in the front-rear direction of the engagement protrusion 147D.

  The gear portion 143B has a substantially circular shape when viewed from the front, is formed integrally with the engaged portion 143A, and is supported on the rotation support shaft 144 so as to be integrally rotatable with the engaged portion 143A via the ball bearing 22A. ing. The gear portion 143B and the engaged portion 143A are configured so that the motor 3 is driven and the rotation shaft 3A rotates in a state where the engagement protrusion 147D and the engagement protrusion 143C are engaged (the state shown in FIG. 8). It rotates integrally with the rotation direction R at the center. A tooth portion 143D is formed on the outer peripheral surface of the gear portion 143B, and meshes with the rack portion 5C of the rod 5B. The rack part 5C and the drive part 143 function as a drive transmission mechanism of the present invention.

  Next, the operation of the clutch mechanism 142 of the nail driver which is a driving machine according to a modification of the first embodiment of the present invention will be described.

  In the initial state of the nailing machine which is a driving machine according to the modification of the first embodiment of the present invention, the hitting part 5 is located at the bottom dead center, and the engaging part 147 and the engaged part 143A are The state is not engaged. When the motor 3 is driven from the initial state and the rotation shaft 3A rotates, the rotation support shaft 144 and the engaging portion 147 rotate together in the rotation direction R. When the engaging portion 147 rotates by a predetermined angle, the engaging inclined surface 147F of the engaging protrusion 147D and the engaged inclined surface 143F of the engaged protrusion 143C abut and engage with each other, and the engaging portion 147 and the engaged portion are engaged. The unit 143A and the unit 143A are engaged with each other and rotate together.

  When the engaging portion 147 and the engaged portion 143A are engaged and rotated together, the striking portion 5 moves upward, and the rotational torque of the rotation support shaft 144 increases along with the movement, and the engagement portion 143A is engaged. The backward force that the combined inclined surface 147F receives from the engaged inclined surface 143F increases. When the striking portion 5 is rotated integrally with the engaging portion 147 and the engaged portion 143A so as to reach the vicinity of the top dead center, the rotational torque of the rotation support shaft 144 exceeds a predetermined value and is received by the engaging inclined surface 147F. The rearward force exceeds the forward biasing force of the spring 148, and the engaging portion 147 starts moving backward while the engaging inclined surface 147F slides with respect to the engaged inclined surface 143F. The predetermined value depends on the inclination angle of the engaging inclined surface 147F and the engaged inclined surface 143F with respect to the axis A, the spring constant (biasing force) of the spring 148, and the like.

  When the engaging portion 147 and the engaged portion 143A rotate until the hitting portion 5 reaches the top dead center, the hitting portion 5 comes into contact with the movement restricting portion 25A, and the rotational torque of the rotation support shaft 144 becomes maximum. When the hitting portion 5 reaches the top dead center and the rotational torque of the rotation support shaft 144 reaches the maximum, the engaging portion 147 further moves rearward while the engaging inclined surface 147F slides with respect to the engaged inclined surface 143F, The engagement between the engaging inclined surface 147F and the engaged inclined surface 143F is released. That is, the engagement between the engaging portion 147 and the engaged portion 143A is released, and the connection between the rotating shaft 3A of the motor 3 and the driving portion 143 is interrupted. The timing at which the connection between the rotating shaft 3A and the drive unit 143 is cut off is determined by the predetermined value of the rotational torque described above, and the lengths of the engaging protrusion 147D and the engaged protrusion 143C in the front-rear direction.

  When the connection between the rotary shaft 3A and the drive unit 143 is interrupted, the striking unit 5 moves while accelerating from the top dead center toward the bottom dead center and strikes the nail N.

  As described above, in the nailing machine that is a driving machine according to the modification of the first embodiment of the present invention, the clutch mechanism 142 urges the engaging portion 147 forward (in the anti-separation direction). The engaging portion 147 has an engaging inclined surface 147F that is in contact with the driving portion 143 and is inclined with respect to the axis A when engaged with the driving portion 143, and the engaging inclined surface 147F is driven. It is configured to move backward (separate direction) against the urging force of the spring 148 by sliding with respect to the portion 143, and the predetermined value described above is the inclination angle of the engagement inclined surface 147F with respect to the axis A. It depends. Therefore, the predetermined value can be adjusted by a simple design change in which the inclination angle of the engagement inclined surface 147F with respect to the axis A is changed, and the movement distance (hitting stroke) when the piston 5A and the rod 5B are driven, that is, the first The driving force of the driving machine according to the modification of the first embodiment can be adjusted by a simple design change. In addition, the structure and operation | movement similar to the nail driver 1 by 1st Embodiment in a nail driver by the modification of 1st Embodiment have an effect similar to the nail driver 1. FIG.

  Next, a nailing machine 201 which is a driving machine according to a second embodiment of the present invention will be described with reference to FIGS. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIGS. 9 to 11 and 15, the nailing machine 201 includes a one-way clutch 227, a support portion 222D, a magnet 243G, and a magnetic detection portion 222E. FIG. 9 is a partial cross-sectional side view showing the internal structure of the entire nailing machine 201, and shows a state where the piston 5A is located at the top dead center. FIG. 10 is a partially enlarged view of FIG. 9 showing the clutch mechanism 42, the drive unit 43, and the one-way clutch 227 of the nailing machine 201. FIG. 11 is a partial cross-sectional front view showing the hitting unit 5 and the drive unit 43. FIG. 11A shows a case where the hitting unit 5 is located at the bottom dead center, and FIG. (C) has shown the case where the hit | damage part 5 is located in a top dead center, when located between points. FIG. 15 is a partially enlarged sectional view showing the one-way clutch 227. The one-way clutch 227 rotates the engaging portion 47 in the reverse direction (rotation in the direction opposite to the rotation direction R (the rotation direction indicated by the arrow in FIG. 15)). It is a figure which shows the state which is regulating.

  As shown in FIGS. 9 and 10, the one-way clutch 227 includes a support portion 222 </ b> D and an engagement portion 47 that protrude from the inner wall of the motor storage portion 22 toward the engagement portion 47 inside the motor storage portion 22. And is provided with a cylindrical portion 227A and a plurality of rollers 227B. The one-way clutch 227 allows rotation in the rotation direction R (rotation direction for moving the striking portion 5 upward) of the engagement portion 47 of the clutch mechanism 42 and rotation in the direction opposite to the rotation direction R (reverse rotation). It is a member that regulates. The one-way clutch 227 is an example of the reverse rotation restricting mechanism of the present invention, the rotation direction R is an example of the first rotation direction of the present invention, and the rotation direction opposite to the rotation direction R (reverse rotation direction) is the first of the present invention. It is an example of 2 rotation directions.

  The cylindrical portion 227 </ b> A has a cylindrical shape extending in the front-rear direction, is fixed to the support portion 222 </ b> D, and is not rotatable relative to the housing 2. Further, as shown in FIG. 15, a plurality of receiving grooves 227a are formed on the inner peripheral surface of the cylindrical portion 227A. The housing groove 227a is a groove that is recessed from the inner peripheral surface of the cylindrical portion 227A to the outer side in the radial direction of the cylindrical portion 227A, and extends in the front-rear direction. One roller 227B is accommodated in each of the plurality of accommodating grooves 227a.

  The roller 227B is a needle-shaped roller extending in the front-rear direction, and is accommodated in the accommodation groove 227a in a state of being rotatable about its own axis and in contact with the outer peripheral surface of the cylindrical portion 47A of the engagement portion 47. . Further, the roller 227B cannot move in the front-rear direction inside the accommodation groove 227a and can move a predetermined amount in the circumferential direction of the cylindrical portion 227A. In the present embodiment, the predetermined amount is substantially the same length as the diameter of the roller 227B.

  The depth of the accommodation groove 227a becomes deeper from the upstream side to the downstream side in the rotation direction R of the accommodation groove 227a, and the depth of the upstream edge of the accommodation groove 227a is shorter than the diameter of the roller 227B, The depth of the side edge is substantially the same as the diameter of the roller 227B. Further, a biasing member, that is, a spring 227C is provided between the roller 227B accommodated in the accommodation groove 227a and the downstream edge portion of the accommodation groove 227a, and the roller 227B is directed from the downstream edge portion toward the upstream edge portion. Is energized.

  Here, the operation and function of the one-way clutch 227 will be described. When the engaging portion 47 starts to rotate in the rotation direction R, each of the plurality of rollers 227B that are in contact with the outer peripheral surface of the cylindrical portion 47A of the engaging portion 47 is inside the receiving groove 227a in which the roller 227B is received. Thus, the rotation starts from the upstream edge in the rotation direction R toward the downstream edge while rotating about its own axis and resisting the biasing force of the spring 227C. When the roller 227B is positioned at the downstream edge where the accommodation groove 227a is deepest, the contact surface pressure between the outer peripheral surface of the cylindrical portion 47A and the roller 227B is reduced. The frictional force between each roller 227B and the outer peripheral surface of the cylindrical portion 47A due to the contact surface pressure in this state does not hinder the rotation of the engaging portion 47 in the rotation direction R with respect to the cylindrical portion 227A. In the state, the engaging portion 47 can continue to rotate in the rotation direction R. That is, the one-way clutch 227 allows the engagement portion 47 to rotate in the rotation direction R.

  On the other hand, when the engaging portion 47 starts reverse rotation (rotation in the direction of the arrow in FIG. 15), each of the plurality of rollers 227B is centered on its own axis within the respective accommodation groove 227a in which the self is accommodated. And starts to move from the downstream edge in the rotation direction R toward the upstream edge while being urged by the spring 227C. When the roller 227B is positioned at the upstream edge where the accommodation groove 227a is the shallowest, the contact surface pressure between the outer peripheral surface of the cylindrical portion 47A and the roller 227B becomes the largest. In this state, the frictional force between each roller 227B and the outer peripheral surface of the cylindrical portion 47A due to the contact surface pressure is maximized, and the engaging portion 47 cannot rotate reversely with respect to the cylindrical portion 227A (see FIG. 15). State). That is, the one-way clutch 227 restricts the reverse rotation of the engaging portion 47.

  As shown in FIGS. 11A to 11C, the magnet 243 </ b> G is a magnet provided on the gear portion 43 </ b> B of the drive unit 43 so as to rotate about the axis A by the rotation of the drive unit 43. . The magnet 243G is positioned above the rotation support shaft 44 in a front view when the driving unit 43 rotates in the rotation direction R and moves the striking unit 5 to the top dead center (the state shown in FIG. 11C). Is configured to do.

  The magnetic detection unit 222E is a front portion of the motor housing unit 22, and is disposed at a position overlapping the tooth portion 43D of the gear portion 43B and the rotation support shaft 44 when viewed from the vertical direction. The magnetic detection unit 222E includes a Hall element that detects magnetism, and detects the magnetism of the magnet 243G. The magnetism detecting unit 222E is connected to the control unit 23A, and when the driving unit 43 rotates and the magnet 243G approaches the magnetism detecting unit 222E, the magnetism of the magnet 243G is detected, and the magnetism is detected. Meanwhile, the signal is continuously output to the control unit 23A. That is, the magnetic detection unit 222E detects that the driving unit 43 has rotated a predetermined angle from the state where the striking unit 5 is located at the bottom dead center (the state shown in FIG. 11A). In other words, the magnetic detection unit 222E detects a state where the piston 5A of the striking unit 5 is in contact with the movement restricting unit 25A (a state where the piston 5A is located at the top dead center). The magnetic detection unit 222E is an example of a contact detection unit of the present invention.

  Next, the operation of the nailing machine 201 will be described. Since the operation and driving operation of the clutch mechanism 42 and the driving unit 43 are the same as those of the nail driver 1 which is the driving machine according to the first embodiment, the operation of the magnetic detection unit 222E and the position of the magnet 243G are mainly described. explain.

  When the motor 3 starts driving and the rotation shaft 3A starts rotating, the rotation of the rotation shaft 3A is transmitted to the rotation support shaft 44 via the speed reduction mechanism 41, and the rotation support shaft 44, the first cam ball 45, and the second cam ball 46 are transmitted. And the engaging part 47 starts rotation in the rotation direction R integrally.

  When the engaging portion 47 starts rotating and the engaging claw 47C of the engaging portion 47 engages with the engaged claw 43C of the driving portion 43, FIG. 11 (a) and FIGS. 12 (a) to 12 (c). It becomes a state. In this state, the magnet 243G is located on the left side of the rotation support shaft 44 in a front view, and the magnetic detection unit 222E does not detect magnetism. FIG. 12 is a view showing the clutch mechanism 42 and the drive portion 43 at the moment when the engaging portion 47 and the engaged portion 43A in the nailing machine 201 are engaged, and FIG. 2 is a view showing the positional relationship between the cam ball 46, the engaging claw 47C, and the engaged claw 43C, FIG. 5B is a top view showing the appearance of the clutch mechanism 42 and the drive unit 43, and FIG. FIG.

  When the engaging portion 47 further rotates in the rotation direction R from the state of FIG. 11A and FIG. 12, the engaging portion 47 and the driving portion 43 rotate together to rotate integrally with each other as shown in FIG. 13A to 13C, the striking part 5 moves upward. In this state, the magnet 243G moves to a position further away from the magnetic detection unit 222E than in the state of FIG. 11A, and the magnetic detection unit 222E does not detect magnetism. FIG. 13 is a view showing the clutch mechanism 42 and the drive unit 43 in a state where the engaging portion 47 and the drive unit 43 in the nailing machine 201 are integrally rotated, and (a) shows the first cam ball 45, The figure which shows the positional relationship of the 2nd cam ball 46, the engaging claw 47C, and the to-be-engaged claw 43C, (b) is a top view which shows the external appearance of the clutch mechanism 42 and the drive part 43, (c) is the clutch mechanism 42 and a drive part. FIG.

  When the engaging portion 47 and the drive portion 43 further rotate in the rotational direction R from the state of FIG. 11B and FIG. 13, the striking portion 5 reaches top dead center, and the engaging claw of the engaging portion 47 47C and the engaged claw 43C of the drive unit 43 are slightly engaged, that is, the states of FIG. 11C and FIGS. 14A to 14C. In this state, as shown in FIG. 11C, the magnet 243G is located between the magnetic detection unit 222E and the rotation support shaft 44 (below the magnetic detection unit 222E and above the rotation support shaft 44) in a front view. To position. At this time, the magnetic detection unit 222E detects the magnetism of the magnet 243G and outputs a signal to the control unit 23A. The signal is a signal indicating that the drive unit 43 has rotated a predetermined angle in the rotation direction R from the state of FIG. 11A, and the state where the piston 5A of the striking unit 5 is in contact with the movement restricting unit 25A. It is a signal to show. FIG. 14 is a view showing the clutch mechanism 42 and the drive unit 43 immediately before the engagement between the engagement part 47 and the drive part 43 in the nail driver 201 is shown, and (a) shows the first cam ball 45, The figure which shows the positional relationship of the 2nd cam ball 46, the engaging claw 47C, and the to-be-engaged claw 43C, (b) is a top view which shows the external appearance of the clutch mechanism 42, (c) is a partial cross-sectional top view which shows the clutch mechanism 42. is there.

  From the state of FIG. 11C and FIG. 14, when the driving portion 43 and the engaging portion 47 do not rotate and only the rotation support shaft 44 further rotates in the rotation direction R, the engaging portion 47 and the driving portion 43 are engaged. Is released, that is, the connection between the rotating shaft 3A of the motor 3 and the drive unit 43 is cut off. When the engagement between the engaging portion 47 and the driving portion 43 is released, the striking portion 5 moves from the top dead center to the bottom dead center and strikes the nail N, and the nail N is ejected from the ejection hole 6a and subjected to the hit. It is driven into the driving material. At the same time, the drive unit 43 reversely rotates (rotates in the direction opposite to the rotation direction R) from the state shown in FIGS. 11C and 14 and returns to the state shown in FIGS. 11A and 12. At this time, the magnetism detection unit 222E does not detect the magnetism of the magnet 243G, and stops signal output to the control unit 23A. The control unit 23A detects that the signal input from the magnetic detection unit 222E is changed to a state where there is no signal input, that is, detects that the striking unit 5 starts moving from the top dead center to the bottom dead center, The drive of the motor 3 is stopped and the rotation of the rotating shaft 3A is stopped.

  As described above, in the nailing machine 201 which is a driving machine according to the second embodiment of the present invention, the engaging part 47 is connected to the driving part 43 in order to move the hitting part 5 upward (in the direction of the top dead center). Since the one-way clutch 227 is configured to rotate in the rotation direction R in the engaged state and restricts the reverse rotation of the engagement portion 47, one direction (rotation direction R) of the engagement portion 47 is provided. Only rotation to can be allowed.

  Specifically, the driving of the motor 3 is stopped during the movement from the bottom dead center to the top dead center of the hitting unit 5 (for example, the state shown in FIG. 11B and FIG. 13) due to a decrease in the remaining amount of the battery pack P or the like. In this case, the driving unit 43 loses the driving force that moves the striking unit 5 upward against the pressure (downward biasing force) of the pressure accumulating chamber 24a. When the hitting part 5 is urged (pressed) downward (in the direction of the bottom dead center) by the pressure of the pressure accumulating chamber 24a in a state where the driving part 43 has lost the driving force, the rack part 5C and the driving part 43 of the hitting part 5 are pressed. Since the gear portion 43B is engaged with the gear portion 43B, the driving portion 43 and the engaging portion 47 engaged with the driving portion 43 are subjected to a force to reversely rotate the driving portion 43 and the engaging portion 47. . In such a case, if the engagement portion 47 can be rotated in the reverse direction, the engagement portion 47 and the drive portion 43 are engaged with each other before the hitting portion 5 reaches the top dead center. However, there is a possibility that the hitting part 5 moves toward the bottom dead center while rotating in the reverse direction, and the nail N is driven with a weaker driving force than when reaching the top dead center. In such a case, the nail N cannot be completely driven in, the finishing degree is not good, and at the same time, there is a possibility that workability may be deteriorated such that the nail N must be re-struck.

  However, since the nail driver 201 includes the one-way clutch 227, the reverse rotation of the engaging portion 47 can be restricted, and the downward movement of the striking portion 5 during the movement from the bottom dead center to the top dead center. Can be regulated. Thereby, there is no above-mentioned thing, a finishing grade can be maintained favorable and workability | operativity can be improved. Further, the same configuration and operation of the nailing machine 201 according to the second embodiment as those of the nail driving machine 1 according to the first embodiment have the same effects as the nailing machine 1.

  Next, a nailing machine which is a driving machine according to a modification of the second embodiment of the present invention will be described with reference to FIG. A nail driver according to a modification of the second embodiment includes a clutch mechanism 142 and a drive unit 143 instead of the clutch mechanism 42 and the drive unit 43 provided in the nail driver 201 according to the second embodiment. ing. Configurations other than the clutch mechanism 142 and the drive unit 143 in the nail driver according to the modification of the second embodiment of the present invention are the same as those of the nail driver 201 according to the second embodiment. Similarly, operations other than the operation of the clutch mechanism 142 and the drive unit 143 are the same as those of the nailing machine 201. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. FIGS. 16A and 16B are diagrams showing a clutch mechanism 142, a drive unit 143, and a one-way clutch 227 of a nailing machine according to a modification of the second embodiment. FIG. 16A is a side view showing an appearance, and FIG. FIG.

  As shown in FIGS. 16A and 16B, the nail driver according to the modification of the second embodiment is a clutch mechanism provided in the nail driver according to the modification of the first embodiment. 142 and the drive unit 143 are provided, and the operations of the clutch mechanism 142 and the drive unit 143 in the driving operation are the same as those of the nail driver according to the modification of the first embodiment.

  In the nailing machine according to the modification of the second embodiment, the one-way clutch 227 is engaged with the support portion 222D that protrudes from the inner wall inside the motor housing portion 22 toward the engaging portion 147 inside the motor housing portion 22. It is provided between the joint portion 147. The one-way clutch 227 allows rotation of the engaging portion 147 in the rotation direction R (rotation direction for moving the striking portion 5 upward) and restricts rotation in the direction opposite to the rotation direction R (reverse rotation). It is a member.

  As described above, in the nailing machine according to the modified example of the second embodiment, the one-way clutch 227 restricts the reverse rotation of the engaging portion 147, and thus the same as the nailing machine 201 according to the second embodiment. An effect can be obtained. Further, the nail driver 1 according to the first embodiment, the nail driver according to the modification of the first embodiment, and the nail according to the second embodiment of the nail driver according to the modification of the second embodiment. The same configuration and operation as the hammer 201 have the same effects as the nailer 1.

  The driving machine according to the present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the gist of the invention described in the claims. For example, in the above embodiment, the nailing machine 1 and the nailing machine 201 for driving the nail N are illustrated as an example of the driving machine. However, the present invention is applied to all tools for driving mechanical joints such as screws and staples. It is applicable to. In addition, as a concrete example of the stopper to be struck, all the common ones in the technical field are objects, and for example, nails, screws, staples, scissors, rivets and the like can be considered.

  In the above-described embodiment, the nailing machine 1 and the nailing machine 201 using the electric motor 3 that rotates the rotating shaft 3A as the drive source are exemplified, but the present invention is not limited to this. The present invention can also be applied to a driving machine including other driving sources such as an engine and a solenoid.

  In the above embodiment, an example of a gas spring system using compressed air as an urging means for the piston 5A and the rod 5B for driving the nail N is illustrated, but the present invention is not limited to this. For example, it is obvious to those skilled in the art that the present invention can be applied to other urging means such as a coil spring.

  In the above-described embodiment, the movement restriction unit 25A is provided. However, the movement restriction unit 25A may be omitted. In this case, the position of the top dead center of the piston 5A and the rod 5B, that is, the movement distance (striking stroke) at the time of driving is such that the engaging portion moves backward from the state where the engaging portion 47 and the engaged portion 43A are engaged. The driving force of the driving machine can be adjusted by appropriately changing the predetermined value depending on the value of the rotational torque of the rotary support shaft 44 that starts moving, that is, the predetermined value.

  In the nailing machine 201 according to the second embodiment and the nailing machine as a modification thereof, the one-way clutch 227 having the roller 227B is used. However, the engagement portion 47 or the engagement portion 147 is rotated in the reverse direction. Any configuration that restricts and allows forward rotation may be used, and a ball-type one-way clutch having a ball and a cylindrical portion in which a ball groove is formed on the inner peripheral surface may be used. The one-way clutch 227 is configured to restrict the reverse rotation of the engaging portion 47 or the engaging portion 147, but may be configured to restrict the reverse rotation of the rotation support shaft 44 or the rotation support shaft 144. In particular, in the configuration in which the rotation support shaft 144 and the engaging portion 147 are not rotatable relative to each other as in the nailing machine according to the modification of the second embodiment of the present invention, the one-way clutch 227 rotates in the reverse direction of the rotation support shaft 144. It is obvious to those skilled in the art that the configuration that regulates the above and the configuration that regulates the reverse rotation of the engaging portion 147 have the same effect.

DESCRIPTION OF SYMBOLS 1,201 ... Nailing machine 2 ... Housing 3 ... Motor 3A ... Rotating shaft 4 ... Power transmission part 5 ... Strike part 5A ... Piston 5B ... Rod 5C ... Rack part 6 ... Nose part 6a ... Punching hole 7 ... Magazine 22 ... Motor Accommodating part 23A ... Control part 24 ... Blowing part accommodating part 24a ... Accumulator 25 ... Cylinder 25A ... Movement restricting part 25B ... Position detecting part 42, 142 ... Clutch mechanism 43, 143 ... Drive part 43A, 143A ... Engaged part 43B , 143B ... Gear portion 43C, 143C ... Engagement claw 43D, 143D ... Tooth portion 44, 144 ... Rotation support shaft 44a ... First groove 44b ... Second groove 45 ... First cam ball 46 ... Second cam ball 47, 147 ... Engagement part 47A, 147A ... Cylindrical part 47B, 147B ... Expanded diameter part 47C ... Engagement claw 48, 148 ... Spring 143E ... Opposing surface 143F ... Engaged Slope 147C ... protruding portion 147D ... engaging projection 147F ... engage inclined surfaces 222E ... magnetic detecting unit 227 ... one-way clutch 227A ... cylindrical portion 227B ... roller 243 g ... Magnet A ... axis N ... nails P ... battery pack R ... rotational direction

Claims (12)

A housing;
A drive source housed in the housing and having an output shaft for rotating the output shaft;
A nose portion in which a punch hole for punching a stopper is formed;
A moving part provided in the housing so as to be capable of reciprocating, and striking the stopper located in the nose part by movement in the striking direction in the reciprocating direction;
A drive transmission mechanism for moving the moving portion in the counter-blowing direction by rotation of the output shaft;
Energy is stored by movement of the moving part in the counter-blowing direction, and energy storage part moves the moving part in the hitting direction by releasing the stored energy;
A clutch mechanism for selectively cutting off the connection between the output shaft and the drive transmission mechanism;
The drive transmission mechanism includes a rack portion extending along the reciprocating direction and fixed to the moving portion. The drive transmission mechanism meshes with the rack portion and is rotatably supported by the housing. And a gear part for moving the moving part in the counter-blowing direction,
The clutch mechanism is configured to disconnect the connection between the output shaft and the drive transmission mechanism after the drive transmission mechanism moves the moving portion in the counter-blowing direction. Embedded machine. The clutch mechanism is
An engagement portion rotatably provided within the housing and engageable with the drive transmission mechanism;
The drive transmission mechanism and the output shaft are connected by engagement of the engagement portion and the drive transmission mechanism, and the drive transmission mechanism and the output are released by disengagement of the engagement portion and the drive transmission mechanism. The driving machine according to claim 1, wherein the driving machine is configured to cut off the connection with the shaft.   3. The driving machine according to claim 2, wherein the clutch mechanism includes a rotation support shaft that is rotatably provided in the housing and rotates the engagement portion by its own rotation. The rotational support shaft increases its rotational torque as the moving part moves in the counter-blowing direction,
The engaging portion is provided so as to be movable in the axial direction of the rotation support shaft, and when the rotational torque exceeds a predetermined value, the engaging portion moves in a separating direction away from the drive transmission mechanism in the axial direction. Start,
4. The driving machine according to claim 3, wherein the engagement between the engagement portion and the drive transmission mechanism is configured to be released by movement of the engagement portion in the separation direction. . The clutch mechanism has a biasing portion that biases the engagement portion in the anti-separation direction,
A ball groove extending in a direction intersecting the axial center direction is formed on the outer peripheral surface of the rotation support shaft.
The engaging portion is provided on the rotation support shaft via a cam ball accommodated in the ball groove, and moves in the separation direction against the urging force of the urging portion by movement of the cam ball along the ball groove. Configured to move to
5. The driving machine according to claim 4, wherein the predetermined value depends on an intersection angle between the ball groove and the axial direction. The clutch mechanism has a biasing portion that biases the engagement portion in the anti-separation direction,
The engaging portion has an inclined smooth surface that is in contact with the drive transmission mechanism in an engaged state with the drive transmission mechanism and is inclined with respect to the axial direction, and the inclined smooth surface is the drive transmission mechanism. Configured to move in the separating direction against the biasing force of the biasing portion by sliding against
The driving machine according to claim 4, wherein the predetermined value depends on an inclination angle of the inclined smooth surface with respect to the axial direction. The engaging portion is configured to rotate in a first rotation direction in order to move the moving portion in the counter-blowing direction in a state where the engaging portion and the drive transmission mechanism are engaged,
Between the housing and the engagement portion, the reverse of allowing the engagement portion to rotate in the first rotation direction and restricting the rotation in the second rotation direction opposite to the first rotation direction. The driving machine according to any one of claims 2 to 6, wherein a rotation restricting mechanism is provided. The rotation support shaft is configured to rotate in a first rotation direction in order to move the moving portion in the counter-blowing direction in a state where the engagement portion and the drive transmission mechanism are engaged,
Between the housing and the rotation support shaft, the reverse rotation that allows the rotation support shaft to rotate in the first rotation direction and restricts the rotation in the second rotation direction opposite to the first rotation direction. The driving machine according to any one of claims 3 to 6, wherein a rotation restricting mechanism is provided.   The driving device according to claim 7 or 8, wherein the reverse rotation restricting mechanism includes a one-way clutch.   The rack portion and the gear portion are configured so that the meshing between the rack portion and the gear portion is maintained even when the moving portion is in any position within the reciprocable range. The driving machine according to any one of claims 1 to 9, wherein the driving machine is provided. Further comprising a restricting part for restricting movement of the moving part in the counter-blowing direction,
The clutch mechanism is configured to cut off the connection between the output shaft and the drive transmission mechanism after the moving portion comes into contact with the restricting portion. The driving machine according to item 1. A contact detection unit that detects a state in which the moving unit is in contact with the restriction unit;
The driving machine according to claim 11, further comprising a stopping unit that stops the rotation of the output shaft when the contact between the moving unit and the regulating unit is released.

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