Work machine

Abstract

To provide a work machine with improved convenience.SOLUTION: A nail gun 10 includes an ejection part 42, a striking part 48, a drive part 56, a magazine 74, a feeder 92, a first restriction part 100, and a second restriction part 120. The ejection part 42 ejects a nail N. The striking part 48 strikes the nail N. The drive part 56 moves the striking part 48 to a stand-by position P1 before striking. The magazine 74 supports the plurality of nails N. The feeder 92 supplies the nail N to the ejection part 42. The first restriction part 100 may be displaced to a restriction position where the first restriction part 100 restricts movement of the feeder 92 to the ejection part 42 side in a K direction and a release position where the first restriction part 100 does not restrict movement of the feeder 92 to the ejection part 42 side in the K direction in conjunction with the striking part 48 being moved by the drive part 56. The second restriction part 120 operates under predetermined conditions when the first restriction part 100 is displaced from the restriction position to the release position to restrict movement of the feeder 92 to the ejection part 42 side in the K direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a work machine. [Background technology]

[0002] The nail driver described in Patent Document 1 has a supply unit that supplies nails stored in a magazine to an ejection unit, and a striking unit that strikes the nails in the ejection unit. In the supply unit, a protrusion of a rotating feeder comes into contact with the nails, thereby supplying the nails to the ejection unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2021 / 084993 Summary of the Invention [Problem to be solved by the invention]

[0004] In the driving machine of Patent Document 1, when nails are supplied to the ejection section at an appropriate timing and then struck into the nails, a method is provided in which a mechanism is provided that links the operation of the feeder with the operation of the striking section.

[0005] However, in a configuration in which the feeder's operation of feeding nails and the striking operation of the striking unit are linked using a mechanism, if the striking unit performs an operation different from a normal striking operation, the feeder may be operated via the mechanism, which may cause a striking failure due to multiple nails being loaded into the ejection unit.

[0006] An object of the present invention is to provide a work machine with improved convenience. [Means for solving the problem]

[0007] The working machine of one embodiment has an ejection unit, an impact unit, a drive unit, a magazine, a feeder, a first regulating unit, and a second regulating unit. The ejection unit ejects a fastener. The impact unit impacts the fastener located in the ejection unit. The drive unit drives the impact unit. The magazine supports a plurality of fasteners. The feeder supplies the fasteners supported by the magazine to the ejection unit by moving toward the ejection unit in a first direction. The first regulating unit is displaceable between a regulating position that regulates the movement of the feeder toward the ejection unit in the first direction and a release position that does not regulate the movement of the feeder toward the ejection unit in the first direction, in accordance with the movement of the impact unit by the drive unit. The second regulating unit operates when the first regulating unit is displaced from the regulating position to the release position under a predetermined condition, thereby regulating the movement of the feeder toward the ejection unit in the first direction. Effect of the Invention

[0008] According to the present invention, the convenience of a work machine can be improved. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a right side view showing the appearance of a nail driver according to a first embodiment. [Diagram 2] 1 is a right side view showing the internal structure of the nail driver when the striking unit is in the standby position. FIG. [Diagram 3] 4 is an explanatory diagram showing a corresponding relationship between a rack of a driver blade and a pinion pin of a pinion wheel. FIG. [Figure 4] FIG. 13 is an explanatory diagram showing a state immediately before the feeder supplies nails in the supply passage to the ejection section. [Diagram 5] FIG. 11 is an explanatory diagram showing a state immediately after the feeder supplies nails in the supply passage to the ejection section. [Figure 6] FIG. 4 is a rear view showing the internal structure of the nail driver when the striking unit is in the standby position. [Figure 7] 3 is an explanatory diagram showing the positional relationship of the pinwheel, cam, feeder and latch mechanism part in FIG. 2. [Figure 8] FIG. 2 is a circuit block diagram showing each component of the nail driver shown in FIG. [Figure 9] 10 is an explanatory diagram showing a state in which the driver blade is displaced in accordance with rotation of the pinwheel when the pinwheel and the driver blade are normally engaged with each other; FIG. [Figure 10] 11 is an explanatory diagram showing the displacement state of the driver blade accompanying rotation of the pinwheel when the misalignment of the engagement between the pinwheel and the driver blade is released; FIG. [Figure 11] 4 is a flowchart including a process for canceling a misaligned nail that is executed in the nail driver of the first embodiment. [Figure 12] 4 is a timing chart showing the driver blade displacement, the presence or absence of a nail at the injection port, the feeder displacement, the solenoid current, and the pinwheel rotation angle at each operation point in time of the nail driver of the first embodiment. [Figure 13] 10 is a flowchart showing a process of a maintenance mode executed in a nail driver of a second embodiment. [Figure 14] 13 is a timing chart showing the driver blade displacement, the presence or absence of a nail at the injection port, the feeder displacement, the solenoid current, and the pinwheel rotation angle at each operation point of the nail driver of the second embodiment. [Figure 15] 13 is a flowchart showing a process of a maintenance mode executed in a nail driver of a third embodiment. [Figure 16] 13 is a timing chart showing the driver blade displacement, the claw member displacement, the presence or absence of a nail at the injection port, the feeder displacement, the solenoid current, and the pinwheel rotation angle at each operation point of the nail driver of the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the first, second, and third embodiments and modifications of the present invention will be described in detail with reference to the drawings. Note that in all drawings referred to in describing the embodiments and modifications, the same or substantially the same configurations and elements are designated by the same reference numerals. In addition, as a rule, configurations and elements that have been described once will not be described repeatedly.

[0011] [Configuration of the first embodiment] 1 shows a nail driver 10 according to a first embodiment. In the nail driver 10, when a predetermined condition is satisfied, a nail N (FIG. 2), which is an example of a fastener, is struck by a striking unit 48, which will be described later. As a result, the nail N is ejected from an ejection unit 42, which will be described later, and driven into a target material G.

[0012] The direction in which the striking portion 48 strikes the nail N is defined as the up-down direction. The striking portion 48 strikes the nail N downward in the up-down direction. Directions perpendicular to the up-down direction are defined as the front-rear direction and the left-right direction. The front-rear direction and the left-right direction are perpendicular to each other. Note that the up-down direction, the front-rear direction and the left-right direction are set merely for the convenience of explanation. The up-down direction is an example of the "second direction". The lower side is an example of the "ejection portion 42 side in the second direction".

[0013] When viewed from the left-right direction, the direction in which a feeder 92 (FIG. 2), which will be described later, moves is defined as the K direction. The K direction intersects with both the up-down direction and the front-rear direction. The K direction is also an example of a "first direction." The K direction is indicated by an arrow K. In the K direction, the side on which the ejection unit 42 is located is defined as the ejection unit 42 side. On the side opposite the ejection unit 42 side in the K direction, multiple nails N (FIG. 2) are housed in a drum unit 75, which will be described later. The feeder 92 supplies the nails N to the ejection unit 42 by moving toward the ejection unit 42 side in the K direction.

[0014] The nail driver 10 includes a housing 12, an ejection unit 42, a striking unit 48, a drive unit 56, a magazine 74, a feeder 92 (FIG. 2), a first restricting unit 100 (FIG. 2), and a second restricting unit 120 (FIG. 2). The nail driver 10 further includes a striking force generating unit 32, a trigger 116, a detection unit 128 (FIG. 8), and a solenoid spring 126 (FIG. 2).

[0015] <<Housing>> As shown in Fig. 1, the nail driver 10 has a housing 12. The housing 12 is composed of two housing members that are butted against each other in the left-right direction and fixed with screws (not shown). As a result, each component of the nail driver 10 is accommodated inside the housing 12.

[0016] The housing 12 has a cylinder portion 14 , a motor portion 16 , a handle portion 18 , an ejection portion 42 , an extension portion 24 , and a mounting portion 26 .

[0017] The cylinder portion 14 is provided in a cylindrical shape extending in the up-down direction. The motor portion 16 extends rearward from the lower portion of the cylinder portion 14 in the front-rear direction. A striking portion 48 is provided inside the cylinder portion 14. The handle portion 18 extends obliquely upward from the center of the cylinder portion 14 rearward.

[0018] The extension portion 24 extends obliquely upward and rearward from the rear of the motor portion 16. The attachment portion 26 is connected to the rear end of the handle portion 18 and the rear end of the extension portion 24. A battery pack 28 is detachably attached to the attachment portion 26. A control portion 130, which will be described later, is provided inside the attachment portion 26.

[0019] Furthermore, the housing 12 is provided with a trigger switch 19 and an impact force generating unit 32. In the nail driver 10, when a trigger 116, which will be described later, is operated by an operator, the trigger switch 19 is actuated, and a predetermined signal for a driving operation is transmitted to the control unit 130.

[0020] <Impact force generation section> The striking force generating unit 32 biases the striking unit 48 downward (toward the ejection unit 42) in the up-down direction. The striking force generating unit 32 is, for example, composed of a cylinder 36, a piston chamber 37, and a pressure accumulator vessel 38 (pressure accumulator chamber 38A). The striking force generating unit 32 biases the striking unit 48 downward by the pressure of the compressed air in the pressure accumulator chamber 38A.

[0021] The cylinder 36 is provided inside the cylinder portion 14. The pressure accumulator container 38 is provided in the upper part of the cylinder portion 14. The pressure accumulator container 38 forms a pressure accumulator chamber 38A. The pressure accumulator chamber 38A is in communication with the piston chamber 37. The piston chamber 37 and the pressure accumulator chamber 38A are filled with compressed air, which is an example of a high-pressure gas. A damper 39 is provided in the lower part of the cylinder 36. When the pressure in the pressure accumulator chamber 38A drops, the pressure in the pressure accumulator chamber 38A can be increased to a predetermined pressure by sending air into the pressure accumulator chamber 38A.

[0022] The damper 39 is a member made of rubber or urethane. When a piston 52, which will be described later, reaches a bottom dead center, the damper 39 comes into contact with the piston 52 to prevent the piston 52 from colliding with the cylinder 36.

[0023] <Injection part> The ejection section 42 is located below the cylinder section 14. The ejection section 42 extends downward from the lower end of the cylinder 36 in the up-down direction. An ejection passage 46 is provided inside the ejection section 42. An ejection outlet 47 is provided at the lower end of the ejection passage 46. A feeder 92 (FIG. 2), which will be described later, supplies nails N (FIG. 2) one by one from the magazine 74 to the ejection passage 46. In the ejection section 42, the nail N receives an impact force from the impact section 48, and the nail N is ejected toward the target material G. In other words, the ejection section 42 ejects the nail N.

[0024] The ejection unit 42 is provided with a push lever 44. The push lever 44 is held by the ejection unit 42 so as to be movable in the vertical direction. The push lever 44 is also biased downward by a spring (not shown). When the push lever 44 is pressed against a target material G, it moves upward against the biasing force of the spring. At this time, a predetermined signal is output to the control unit 130.

[0025] <Strike section> The striking section 48 strikes the nail N (FIG. 2) located in the ejection section 42 towards a target material G. The striking section 48 has a piston 52 and a driver blade 54. The striking section 48 is capable of carrying out a first operation, a second operation, and a third operation, which will be described later.

[0026] <<Piston>> The piston 52 is accommodated in the cylinder 36 so as to be capable of reciprocating in the vertical direction. In other words, the piston 52 is provided in the cylinder 36 so as to be capable of reciprocating between the top dead center and the bottom dead center along the axial direction of the cylinder 36. The piston 52 is biased downward in the vertical direction by the pressure received from the pressure accumulator chamber 38A. The piston chamber 37 is formed by the piston 52 partitioning the inside of the cylinder 36. Therefore, the volume of the piston chamber 37 increases and decreases with the reciprocating motion of the piston 52. A seal member (not shown) is provided on the outer circumferential surface of the piston 52. A driver blade 54 is connected to the lower part of the piston 52.

[0027] <<Driver blade>> As shown in Fig. 3, the driver blade 54 is, for example, a plate-shaped metal member. The driver blade 54 extends downward from the lower surface of the piston 52 in the vertical direction. The driver blade 54 can reciprocate vertically together with the piston 52 inside the cylinder 36 (Fig. 1). The driver blade 54 strikes downward the heads of the nails N (Fig. 2) that are successively supplied to the injection passage 46 (Fig. 1).

[0028] Ten racks 55 are provided at a predetermined interval in the vertical direction on the right side of the driver blade 54. When distinguishing between the racks 55, the one located at the lowest position is called rack 55A, and the racks are called racks 55A, 55B, 55C, 55D, 55E, 55F, 55G, 55H, 55I, and 55J in order from bottom to top. A rib 55K is provided on the lower part of the driver blade 54. The rib 55K is detected by a blade detector switch 136 (FIG. 8) described later.

[0029] <Drive unit> The drive unit 56 shown in FIG. 1 drives the striking unit 48. Specifically, the drive unit 56 moves the striking unit 48 to a pre-striking standby position P1 (FIG. 2). The standby position P1 is an example of a first position. The drive unit 56 has a motor 58, a speed reduction mechanism 62, a drive shaft 64 (FIG. 2), and a rotating unit 66 (FIG. 2). The operation of the drive unit 56 is controlled by a part of the control unit 130, which will be described later. For this reason, the drive unit 56 includes a part of the control unit 130. The drive unit 56 operates by receiving electric power, and enables the striking unit 48 to move upward against the biasing force of the striking force generating unit 32.

[0030] The motor 58 is housed in the motor section 16. The motor 58 has an output shaft 58A and a rotor 58B. The motor 58 is a brushless motor that operates with power supplied from the battery pack 28. The output shaft 58A extends in the front-rear direction. The reduction mechanism section 62 includes a planetary gear. The output shaft 58A is connected to a pinwheel 68 (FIG. 2) described later via the reduction mechanism section 62.

[0031] As shown in Fig. 2, the drive shaft 64 has a central axis along the front-rear direction. The drive shaft 64 is rotatably supported by the housing 12 (Fig. 1). A rotational force is transmitted to the drive shaft 64 from the reduction mechanism 62 (Fig. 1). The rotational force transmitted to the drive shaft 64 is transmitted to a rotating unit 66, which will be described later.

[0032] <<Rotating part>> The rotating unit 66 rotates by receiving a driving force (rotational force) from the motor 58 (FIG. 1). The rotating unit 66 rotates in the direction indicated by the arrow +R or arrow -R (FIG. 3). Note that, when viewing the rotating unit 66 from the rear, the clockwise direction indicated by the arrow +R is the forward rotation direction, and the counterclockwise direction indicated by the arrow -R is the reverse rotation direction. The forward rotation direction is an example of a first rotation direction. The reverse direction is an example of a second rotation direction that is opposite to the first rotation direction. The rotating unit 66 moves the striking unit 48 to the standby position P1 by rotating in the forward rotation direction during a series of striking operations described below.

[0033] Specifically, the rotating unit 66 has a pinwheel 68 and ten pinion pins 72. The pinwheel 68 is fixed to the drive shaft unit 64 so as to have the same central axis as the drive shaft unit 64. The ten pinion pins 72 are provided on the pinwheel 68 at intervals within a predetermined angular range in the rotational direction. When all the pinion pins 72 are released from the rack 55, the rotational force of the pinwheel 68 is not transmitted to the driver blade 54.

[0034] 3, the ten pinion pins 72 are capable of engaging and disengaging with the ten racks 55 in a one-to-one relationship. That is, the striking portion 48 is capable of engaging with the rotating portion 66. Here, when distinguishing between the ten pinion pins 72, the one located at one end in the circumferential direction is referred to as pinion pin 72A, and the following pinion pins are referred to in order in the circumferential direction as pinion pins 72B, 72C, 72D, 72E, 72F, 72G, 72H, 72I, and 72J.

[0035] <Magazine> As shown in Fig. 1, the magazine 74 is attached to the lower part of the housing 12. In this way, the magazine 74 is supported by the housing 12. The magazine 74 stores a plurality of linked nails N (Fig. 2) in a roll shape. The plurality of nails N are linked by a linking portion M (Fig. 4) while being supported by the magazine 74.

[0036] Specifically, the magazine 74 has a hollow drum portion 75, a guide portion 76 in which the nails N are aligned, and a lid portion 78 (FIG. 4) that faces the guide portion 76 in the left-right direction. The nails N are stored inside the drum portion 75 in a rolled state. The guide portion 76 extends forward from the drum portion 75 and is connected to the ejection portion 42. Some of the nails N are positioned in the guide portion 76 with the direction perpendicular to the K direction as the axial direction, and are lined up along the K direction.

[0037] 2, a pin 77 is provided on the guide portion 76. The pin 77 protrudes from the guide portion 76 to the right.

[0038] As shown in Fig. 4, a supply passage 82 is provided between the guide portion 76 and the lid portion 78. The supply passage 82 extends in the front-rear direction toward the injection passage 46. The nails N are aligned in the supply passage 82 and fed one by one into the injection passage 46. The injection portion 42 is provided with a rotation shaft 84 extending in the vertical direction. The lid portion 78 can open and close the supply passage 82 by rotating about the rotation shaft 84. The lid portion 78 is provided with a claw member 86 and a spring 88.

[0039] The claw member 86 has a base portion 86A that rotates around a rotation shaft 89 that extends in the vertical direction, a plate portion 86B that extends forward from the base portion 86A, and a claw portion 86C that protrudes from the plate portion 86B into the supply passage 82. The plate portion 86B is biased toward the supply passage 82 by a spring 88. The magazine 74 and a feeder 92, which will be described later, are collectively referred to as the supply portion 70.

[0040] <Feeder> 4 and 5, the feeder 92 moves toward the ejection unit 42 in the K direction to supply the nails N supported by the magazine 74 to the ejection unit 42. The feeder 92 performs linear motion in the K direction. The feeder 92 biases the other nails N, among the multiple nails N, that are located on the other side of the nail N located at the end on the ejection unit 42 side in the K direction, toward the ejection unit 42 in the K direction. Specifically, the feeder 92 has a movable member 94, a feed member 96, and a spring 98.

[0041] <<Moving parts>> The movable member 94 has a fixed portion 94A fixed to a plunger 124 (described later), a contacted portion 94B (FIG. 2) protruding upward from the fixed portion 94A, and a shaft portion 94C extending in a direction perpendicular to the K direction. The fixed portion 94A is capable of reciprocating in the K direction in response to movement of the plunger 124. The contacted portion 94B comes into contact with a regulating member 102 (FIG. 2) (described later).

[0042] <<Feeding material>> The feed member 96 is provided rotatably about the shaft portion 94C. The feed member 96 has a first claw portion 96A and a second claw portion 96B. The first claw portion 96A and the second claw portion 96B protrude into the supply passage 82. The first claw portion 96A feeds out the first nail N. The second claw portion 96B feeds out the second nail N.

[0043] <<Spring>> The spring 98 is a torsion spring and is wound around the shaft portion 94 C. The spring 98 biases the feed member 96 toward the supply passage 82.

[0044] <First Regulatory Section> As shown in Fig. 2, the first regulating portion 100 is configured to be displaceable between a regulating position and a release position in accordance with the movement of the impact portion 48 by the drive portion 56 (Fig. 1). The regulating position of the first regulating portion 100 is a position of the first regulating portion 100 when the first regulating portion 100 regulates the movement of the feeder 92 in the K direction toward the ejection portion 42. The release position of the first regulating portion 100 is a position of the first regulating portion 100 when the first regulating portion 100 does not regulate the movement of the feeder 92 in the K direction toward the ejection portion 42. The first regulating portion 100 has, for example, a regulating member 102, a switching member 104, a biasing portion 106, and a cam 112.

[0045] <<Regulation parts>> As shown in FIG. 7, the regulating member 102 regulates the movement of the movable member 94 in the K direction toward the ejection unit 42 (FIG. 2) (front side). In other words, the regulating member 102 regulates the movement of the feeder 92 in the K direction toward the ejection unit 42. Specifically, the regulating member 102 can be changed between a regulating position and an allowable position by rotating about the pin 77. When the regulating member 102 is in the regulating position, it regulates the movement of the feeder 92 by abutting against the abutment portion 94B. When the regulating member 102 is in the allowable position, it does not abut against the abutment portion 94B and allows the movement of the feeder 92 in the K direction.

[0046] The regulating member 102 has a base 102A, an arm 102B, a protruding portion 102C, an acting portion 102D, and an input portion 102E. The base 102A is formed in a plate shape having a predetermined thickness in the left-right direction. The base 102A is connected to the pin 77. The arm 102B extends from a part of the base 102A along the tangent direction of the pin 77. The protruding portion 102C protrudes to the right from a lower portion of the arm 102B.

[0047] The action portion 102D extends downward from the front of the arm portion 102B. When restricting the movement of the feeder 92, the action portion 102D comes into contact with the abutment portion 94B. The input portion 102E protrudes forward from the action portion 102D. The input portion 102E receives a force from the switching member 104 by coming into contact with the switching member 104, which will be described later.

[0048] <<Switching parts>> The switching member 104 has an extending portion 104A, a contacting portion 104B, and a biased portion 104C. The extending portion 104A is formed in a plate shape having a predetermined thickness in the front-rear direction and extends in the up-down direction. The extending portion 104A is guided in the up-down direction by contacting with a guide member 105 (FIG. 2). The switching member 104 is a member that can switch the position of the regulating member 102 between an allowable position and a regulated position.

[0049] The contact portion 104B is bent rearward at a substantially right angle from the lower end of the extending portion 104A. The contact portion 104B is capable of contacting the input portion 102E from below. The biased portion 104C protrudes to the right from a portion of the extending portion 104A that is above the contact portion 104B.

[0050] << Pressurizing part >> The biasing portion 106 applies a biasing force to the restricting member 102 and the switching member 104. The biasing portion 106 has a first spring 107 and a second spring 108.

[0051] <<<First Spring>>> The first spring 107 is positioned with the vertical direction as its axial direction. The upper end of the first spring 107 is attached to a wall portion 109 (FIG. 2) provided in a part of the magazine 74 (FIG. 2). The lower end of the first spring 107 abuts against the upper surface of the protruding portion 102C. As a result, the first spring 107 biases the restricting member 102 downward.

[0052] <<<Second spring>>> The second spring 108 is positioned with the vertical direction as its axial direction. The lower end of the second spring 108 is attached to a wall portion 111 (FIG. 2) provided in a part of the magazine 74. The upper end of the second spring 108 abuts against the biased portion 104C from below. As a result, the second spring 108 biases the switching member 104 upward.

[0053] <<Cam>> 6 and 7, the cam 112 converts the rotational motion of the drive unit 56 (FIG. 1) into vertical linear motion of the switching member 104. The cam 112 is a member in which a notch 113 is formed in part of the outer periphery of a circular plate having a predetermined thickness in the front-rear direction.

[0054] The cutout portion 113 has a first cam surface 113A and a second cam surface 113B. The first cam surface 113A extends radially inward from the outer peripheral surface 112A of the cam 112. The second cam surface 113B extends from the radially inner end of the first cam surface 113A in a direction substantially perpendicular to the first cam surface 113A. The upper end of the extension portion 104A can abut against the outer peripheral surface 112A and the cutout portion 113.

[0055] When the cam 112 rotates, the extending portion 104A switches between a state in which it abuts against the outer peripheral surface 112A and a state in which it abuts against the notch portion 113, thereby switching between a state in which the regulating member 102 is in the regulating position and a state in which the regulating member 102 is in the permissible position.

[0056] <Second Regulatory Section> 7 operates when the first regulating unit 100 is displaced from the regulating position to the release position under "predetermined conditions," thereby regulating the movement of the feeder 92 in the K direction toward the injection unit 42 (FIG. 2). The operation of the second regulating unit 120 is controlled by the control unit 130 (FIG. 8), which will be described later. The second regulating unit 120 has a solenoid 122.

[0057] In this embodiment, the "predetermined condition" corresponds to, for example, the occurrence of a misalignment between the pinion pin 72 and the rack 55 (FIG. 3), or the refilling of air into the pressure accumulator chamber 38A (FIG. 1) in the maintenance mode of the nail driver 10. Furthermore, the "predetermined condition" includes the rotation of the rotating unit 66 in a reverse direction that is the opposite direction to the forward rotation direction, and the striking unit 48 performing a special operation. The "special operation" refers to an operation performed by the striking unit 48 (FIG. 1) that is different from the series of striking operations.

[0058] During a series of striking operations, when the first regulating portion 100 is displaced from the regulating position to the release position, the second regulating portion 120 is controlled by the control portion 130 (FIG. 8) to stop regulating the movement of the feeder 92.

[0059] <<Solenoid>> 4 and 5, the solenoid 122 is fixed to the right side of the guide portion 76. The solenoid 122 has a plunger 124. The plunger 124 is fixed (connected) to the feeder 92. When electricity is applied to the solenoid 122, it is possible to move the feeder 92 to the side opposite the ejection portion 42 in the K direction.

[0060] <Solenoid spring> The solenoid spring 126 is an example of a feeder biasing portion. The plunger 124 is inserted into the solenoid spring 126. The solenoid spring 126 is inserted between the solenoid 122 and the movable member 94, and biases the feeder 92 toward the ejection portion 42 (FIG. 2) in the K direction.

[0061] When the power supply to the solenoid 122 is turned off, the feeder 92 is urged toward the ejection unit 42 in the direction K by the urging force of the solenoid spring 126. In other words, when the power supply to the solenoid 122 is turned off, the plunger 124 moves toward the ejection unit 42 in the direction K by the urging force of the solenoid spring 126. As the plunger 124 moves toward the ejection unit 42, the nail N (FIG. 2) is sent out to the ejection passage 46. Thereafter, when the power supply to the solenoid 122 is turned on, the plunger 124 moves to the other side in the direction K (is pulled back).

[0062] <Trigger> A trigger 116 shown in Fig. 1 is an example of an operating part operated by an operator. The trigger 116 is provided on the underside of the front end of the handle part 18. The trigger 116 is turned on (pushed in) when driving a nail N (Fig. 2) into a mating material G. Whether the trigger 116 is operated as an on operation or an off operation is detected by a trigger switch 19. Information on the detected operating state is transmitted to a control part 130 (Fig. 8) described later.

[0063] <Detection unit> 3, the detection unit 128 (FIG. 8) detects whether or not there is an abnormality in the engagement between the striking unit 48 and the rotating unit 66. Specifically, the detection unit 128 detects the engagement state between the rack 55 and the pinion pin 72.

[0064] 8, detection unit 128 includes a rotational position detection circuit 132, a rotation amount detection circuit 134, a blade detector switch 136, and a blade detector switch operation detection circuit 138. Control unit 130, which will be described later, determines whether or not an abnormality in the engagement state (misalignment) between rack 55 and pinion pin 72 (FIG. 3) has occurred, based on position information of pinwheel 68 (FIG. 3) and position information of driver blade 54 (FIG. 3) obtained by detection unit 128.

[0065] Specifically, the rotational position detection circuit 132 detects the rotational position of the pinwheel 68 based on information about the rotational state of the rotor 58B obtained from the three magnetic sensors H. The rotational position information obtained in the rotational position detection circuit 132 is transmitted to the control unit 130. The rotation amount information obtained in the rotational position detection circuit 132 is transmitted to the control unit 130. The rotation amount detection circuit 134 detects the amount of rotation of the pinwheel 68 based on the information obtained from the rotational position detection circuit 132.

[0066] The blade detector switch 136 is normally in the OFF state, and is turned ON by contact with the driver blade 54 (FIG. 2). The blade detector switch operation detection circuit 138 detects the vertical position and movement state (lowering, rising) of the driver blade 54 based on the ON information and OFF information from the blade detector switch 136. The information detected by the blade detector switch operation detection circuit 138 is sent to the control unit 130.

[0067] <Control Unit> The control unit 130 shown in Fig. 1 is a microcomputer including a processor and a memory. The control unit 130 controls the operation of each part of the nail driver 10. The control unit 130 operates the motor 58 when the piston 52 located at the bottom dead center P3 (Fig. 9) is to be moved to the top dead center P2 (Fig. 9).

[0068] When both the signal by the operation of the push lever 44 and the signal by the operation of the trigger 116 are input, the control unit 130 supplies a motor current to the motor 58 to operate the motor 58. This rotates the pinwheel 68 (FIG. 2), pushes up the driver blade 54, and moves the piston 52 from the bottom dead center P3 to the top dead center P2. The piston 52 then moves from the top dead center P2 to the bottom dead center P3, causing the driver blade 54 to descend. In other words, the piston 52 makes one reciprocating movement between the bottom dead center P3 and the top dead center P2, and the nail N (FIG. 2) is struck by the driver blade 54, causing the nail N to be driven out of the ejection unit 42. In other words, a series of driving operations of the nail driver 10 is performed once.

[0069] <Circuit block diagram> 8 shows a circuit block diagram of the nail driver 10. Note that a description of the configuration already described will be omitted. The nail driver 10 has a main circuit section 142. The battery pack 28 supplies power to the main circuit section 142 via the mounting section 26.

[0070] In the main circuit section 142, the inverter circuit 144 converts the power supplied from the battery pack 28 into drive power and supplies it to the motor 58. The control signal output circuit 147 operates the inverter circuit 144 based on instructions from the control section 130. The first drive section 146 drives the impact section 48 (FIG. 2). The second drive section 148 drives the feeder 92 (FIG. 2). The three magnetic sensors H detect the rotation state of the rotor 58B. The solenoid control signal output circuit 152 switches the switching element 153 based on an instruction signal received from the control section 130, and operates the second drive section 148.

[0071] The voltage detection circuit 154 detects a voltage corresponding to the residual power of the battery pack 28 when power is supplied to the first drive unit 146 via the inverter circuit 144. The first current detection circuit 155 detects the motor current flowing through the motor 58. The second current detection circuit 156 detects the effective value of the current flowing through the solenoid 122. The power switch circuit 158 ​​is a switch that can be turned on and off by an operator. When the power switch circuit 158 ​​is in the on state, it causes the power supply voltage supply circuit 159 to supply the power supply voltage to the control unit 130, and when in the off state, it stops the supply of the power supply voltage.

[0072] The trigger switch operation detection circuit 161 detects whether the trigger switch 19 (FIG. 1) has been operated to the ON side, and transmits information on whether the trigger switch 19 is ON or OFF to the control unit 130. The push switch 162 switches from OFF to ON when the push lever 44 (FIG. 1) comes into contact with the opposing material G (FIG. 1). The push switch 162 switches from ON to OFF when the push lever 44 is separated from the opposing material G. The push switch operation detection circuit 163 detects whether the push switch 162 is ON or OFF, and transmits the ON or OFF status of the push lever 44 to the control unit 130.

[0073] <Drive unit operation settings> The operation of the drive unit 56 shown in Fig. 1 is controlled by the control unit 130. When the detection unit 128 (Fig. 8) detects an abnormality in a third operation described below, the drive unit 56 rotates the rotation unit 66 (Fig. 2) in the reverse direction (the direction of the arrow -R). When the operator performs a first operation on the trigger 116, the drive unit 56 causes the striking unit 48 to perform the series of striking operations described above.

[0074] <Latch release range> 6, cam 112 has a rotation center C. Here, when a portion of cutout portion 113 within range S in the rotation direction indicated by central angle θS of cam 112 comes into contact with switching member 104, engagement between regulating member 102 and contacted portion 94B (FIG. 2) is released. In other words, range S represents a latch release range in which engagement (latch) between movable member 94 and regulating member 102 is released and movable member 94 can move toward ejection portion 42.

[0075] <Striking part movement and position> 2, in the following description, the position of the upper end 54A of the driver blade 54 in the vertical direction is defined as the position of the striking portion 48. The position of the striking portion 48 is shown with the central position of the drive shaft portion 64 in the vertical direction as the reference position. When the striking portion 48 is in the standby position P1, the lower end of the driver blade 54 is located below the upper ends of the nails N supplied by the feeder 92 (FIG. 5).

[0076] The striking unit 48 can execute a series of striking operations, moving from the standby position P1 to strike the nail N, and then returning to the standby position P1 again by being driven by the drive unit 56. Here, the above-mentioned "predetermined condition" includes the drive unit 56 driving the striking unit 48 when the striking unit 48 is not executing a series of striking operations.

[0077] 9, regarding the vertical position of the upper end 54A, a second position set as a position above the standby position P1 is defined as a top dead center P2. A third position set as a position below the standby position P1 is defined as a bottom dead center P3. Furthermore, a position between the standby position P1 and the bottom dead center P3 is defined as a first intermediate position PA.

[0078] As shown in FIG. 10, a position between the first intermediate position PA and the bottom dead center P3 and close to the bottom dead center P3 is defined as a second intermediate position PB.

[0079] When trigger 116 (FIG. 1) is operated during a series of striking operations, striking unit 48 shown in FIG. 2 moves in the up-down direction opposite to ejection unit 42 (upward) against the biasing force of striking force generating unit 32 (FIG. 1) as striking unit 48 engages with rotating unit 66 and the rotating unit 66 rotates. Specifically, striking unit 48 moves from standby position P1 to top dead center P2 (FIG. 9). This operation of striking unit 48 is referred to as a first operation.

[0080] Furthermore, as the rotating part 66 rotates, the striking part 48 is disengaged from the rotating part 66, and is moved by the biasing force of the striking force generating part 32 from the top dead center P2 to the bottom dead center P3 (FIG. 9) on the ejection part 42 side in the vertical direction to strike the nail N. This movement of the striking part 48 is referred to as the second movement.

[0081] Furthermore, as the rotating unit 66 rotates while again engaged with the striking unit 48, the striking unit 48 moves from the bottom dead center P3 to the standby position P1 in the vertical direction opposite to the ejection unit 42 side against the biasing force of the striking force generating unit 32. This operation of the striking unit 48 is referred to as the third operation. In this manner, the striking unit 48 is capable of performing the first operation, the second operation, and the third operation.

[0082] [Operation of the first embodiment] 9 and 10 show changes in the engagement state between the pinion pins 72 and the racks 55 when the striking portion 48 is displaced in the up-down direction. Note that in Fig. 9 and 10, the pinion pins 72 and the racks 55 that are engaged are labeled with reference numerals, and the reference numerals are basically omitted for those that are not engaged.

[0083] <When engagement is normal> As shown in FIG. 9, when the striking unit 48 is in the standby position P1, the pinion pin 72J and the rack 55A are engaged. This state is a normal engagement state, and there is no misalignment. When the pinwheel 68 starts to rotate forward, the driver blade 54 rises. As a result, the striking unit 48 reaches the top dead center P2. Then, the pinwheel 68 continues to rotate forward, and the engagement between the pinion pin 72 and the rack 55 is released, causing the piston 52, which is biased downward, and the driver blade 54 to descend. As a result, the striking unit 48 reaches the bottom dead center P3.

[0084] Furthermore, as the pinwheel 68 continues to rotate in the forward direction, the pinion pin 72A and the rack 55J engage with each other. Then, as the pinion pin 72A and the rack 55J sequentially engage with each other, the striking portion 48 rises from the bottom dead center P3 toward the standby position P1.

[0085] Here, when the striking unit 48 is at the first intermediate position PA between the bottom dead center P3 and the standby position P1, it is assumed that the blade detector switch 136 detects that the pinion pin 72G and the rack 55D are engaged with each other. If this combination is normal, the detector 128 (FIG. 8) transmits an information signal to the controller 130 (FIG. 8) indicating that the striking unit 48 and the rotating unit 66 are normally engaged with each other.

[0086] <If the engagement is abnormal> When the impact part 48 shown in Fig. 10 is at the second intermediate position PB on the front side (upper side) of the bottom dead center P3, the pinion pin 72A and the rack 55I may engage. Possible reasons for this include, for example, that the mating material G (Fig. 1) is too hard and the nail N is not sufficiently driven in, or that the nail N is pinched midway through its path. This engagement state is an abnormal engagement state in which the racks 55 that engage with the pinion pins 72 are misaligned one by one, resulting in a misalignment. When the pinwheel 68 starts to rotate forward at this point, the driver blade 54 rises.

[0087] As an example, while the driver blade 54 is rising, it is assumed that the detection unit 128 (FIG. 8) detects that the pinion pin 72F and the rack 55D are engaged. At this time, the detection unit 128 transmits an information signal to the control unit 130 (FIG. 8) indicating that the engagement between the striking unit 48 and the rotating unit 66 is abnormal. In this manner, the detection unit 128 detects the misalignment between the striking unit 48 and the rotating unit 66.

[0088] When the misalignment between the striking portion 48 and the rotating portion 66 is detected, the control portion 130 rotates the pinwheel 68 in the opposite direction. Then, the engagement between the pinion pin 72 and the rack 55 is released, causing the piston 52 and the driver blade 54 to descend. As a result, the striking portion 48 reaches the bottom dead center P3. At this time, the combination of the engagement between the pinion pin 72 and the rack 55 is reset.

[0089] Subsequently, when the pinwheel 68 starts to rotate in the normal direction, the combination of the engagement between the pinion pin 72 and the rack 55 becomes the correct combination. For example, the pinion pin 72G and the rack 55D are engaged. As a result, the detection unit 128 transmits an information signal to the control unit 130 that the striking unit 48 and the rotating unit 66 are normally engaged. In this way, the pinwheel 68 is reversed, and the driver blade 54 is lowered to the bottom dead center P3 and then raised, thereby eliminating the misalignment.

[0090] <Processing for detecting and correcting misconnections> The misalignment detection process and the misalignment elimination process in the nail driver 10 shown in Fig. 1 will be described with reference to Fig. 11. In the description of Fig. 11, the components already described will be described with reference to Figs. 1 to 10, and individual figure numbers will be omitted.

[0091] Each process shown in Fig. 11 is performed by the processor in the control unit 130 reading a processing program from the memory, expanding it in a part of the memory, and executing it. Note that each process shown in Fig. 11 is an example of the processing by the control unit 130. In Fig. 11, "lever" refers to the push lever 44. "Blade" refers to the driver blade 54.

[0092] In step S10, the control unit 130 detects that the power of the nail driver 10 is on. Then, the process proceeds to step S12. In step S12, the control unit 130 selects the normal mode. Then, the process proceeds to step S14.

[0093] In step S14, the control unit 130 judges whether the push lever 44 is pressed against the target material G and the trigger 116 is on (hereinafter, this is referred to as a normal state). If it is the normal state (S14: Yes), the process proceeds to step S16. If it is not the normal state (S14: No), the process proceeds to step S18.

[0094] In step S16, the control unit 130 starts the forward rotation of the pinwheel 68, drives in the nail N, and then winds up the driver blade 54. Then, the process proceeds to step S20.

[0095] In step S18, the control unit 130 determines whether or not a power-off operation has been performed. If a power-off operation has been performed (S18: Yes), the process proceeds to step S38. If a power-off operation has not been performed (S18: No), the process proceeds to step S12.

[0096] In step S20, the control unit 130 determines whether or not misalignment between the pinion pin 72 and the rack 55 has been detected based on the detection information from the detection unit 128. If misalignment has been detected (S20: Yes), the process proceeds to step S24. If misalignment has not been detected (S20: No), the process proceeds to step S22.

[0097] In step S22, the control unit 130 rotates the pinwheel 68 in the normal direction by a predetermined amount, and then stops the operation of the pinwheel 68. Then, the process proceeds to step S12.

[0098] In step S24, the control unit 130 temporarily stops the detection operation in the mishanging detection mode. Then, the process proceeds to step S26. In step S26, the control unit 130 judges whether the push lever 44 is pressed against the target material G and the trigger 116 is on. If this is the case (S26: Yes), the process proceeds to step S28. If this is not the case (S26: No), the process proceeds to step S24.

[0099] In step S28, the control unit 130 starts the reverse rotation (reversal) of the pinwheel 68. Then, the process proceeds to step S30. In step S30, the control unit 130 turns on the operation of the solenoid 122. This causes the feeder 92 to move (be pulled back) to the side opposite the injection unit 42 side in the K direction. Then, the process proceeds to step S32. In step S32, the control unit 130 starts the forward rotation of the pinwheel 68. Then, the process proceeds to step S34.

[0100] In step S34, the control unit 130 turns off the operation of the solenoid 122. This allows the feeder 92 to move in the K direction toward the ejection unit 42. Note that the feeder 92 does not feed the nails N because its movement is restricted by the restricting member 102. Then, the process proceeds to step S36. In step S36, the control unit 130 rotates the pinwheel 68 until the driver blade 54 reaches the standby position P1. In other words, the driver blade 54 is wound up. Then, the process proceeds to step S20.

[0101] In step S38, the control unit 130 turns off the power of the nail driver 10 and ends the process.

[0102] <Functions of the First Restriction Portion and the Second Restriction Portion> The action of the first restriction portion 100 and the second restriction portion 120 shown in Fig. 7 will be described with reference to Fig. 12. In the description of Fig. 12, the components already described will be described with reference to Figs. 1 to 10, and individual figure numbers will be omitted.

[0103] 12, "blade displacement" refers to the position of the striking portion 48 and the displacement of the driver blade 54. Furthermore, position PN is the position of the upper end (nail head) of the nail N.

[0104] "Presence or absence of nail at injection port" refers to the presence or absence of nail N at injection port 47 (FIG. 1) of injection unit 42. A dashed arrow indicates a state in which nail N is not present, and a solid arrow indicates a state in which nail N is present.

[0105] "Feeder displacement" refers to the position of the feeder 92 in the K direction. Position F1 is the position where the feeder 92 is pulled back to the side opposite the ejection section 42 in the K direction. Position F2 is the position where the feeder 92 is regulated by the regulating member 102. Position F3 is the position where the feeder 92 loads the nail N into the ejection section 42. The solid line graph represents the feeder displacement of this embodiment, and the dashed line represents a comparative example where the feeder 92 is not pulled back.

[0106] "Solenoid current" refers to the state of current flow to the solenoid 122. Off means no current flow, and on means current flow. The dashed dotted line indicates a comparative example in which the solenoid current is kept off.

[0107] "Pinwheel rotation angle" refers to the rotation angle of pinwheel 68. Note that rotation angle θ1 = 0°, rotation angle θ4 = 360°, and θ1 < θ2 < θ3 < θ4. Rotation angle θ2 represents the rotation position when forward rotation of pinwheel 68 is stopped. Rotation angle θ3 represents the rotation position when reverse rotation of pinwheel 68 is stopped. Within the range of central angle θS, restrictions by first restriction unit 100 and second restriction unit 120 are released, and solenoid 122 becomes movable in the K direction.

[0108] The time points t1 to t22 shown in FIG. 12 are shown as an example, and the interval (time) between each time point may be set to a length of time different from that shown in FIG.

[0109] At time t0, the striking unit 48 is at standby position P1. The standby position P1 is located below the position PN of the upper end of the nail N. At time t1, the pinwheel 68 rotates forward, causing the driver blade 54 to start rising. From time t2 to time t3, the rotation angle of the pinwheel 68 enters the range of the central angle θS, so that the restriction by the restricting member 102 is released, and the feeder 92 moves from position F2 to position F3, thereby loading the nail N.

[0110] At time t4, the driver blade 54 descends from the top dead center P2. At this time, it is assumed that the striking part 48 fails to strike the nail N, and the nail N remains in the ejection part 42, causing a nail jam. At time t5, the pinion pin 72 and the rack 55 become misaligned due to the nail jam. Then, the driver blade 54 cannot reach the bottom dead center P3 and remains at the first intermediate position PA. At this time, the misalignment is not detected.

[0111] From time t6 to time t8, the solenoid current is turned on, and the feeder 92 is displaced (pulled back) from position F3 to position F1. At time t8, the solenoid current is turned off, and the feeder 92 is in a free state. At time t9, the feeder 92 is biased by the solenoid spring 126 to move to position F2, and the movement is restricted by the restricting member 102.

[0112] At time t10, the driver blade 54 starts to rise. At time t11, the detection unit 128 detects the misalignment, and the rise of the driver blade 54 is stopped. Between time t11 and time t12, the worker resolves the nail jam. At time t12, the pinwheel 68 starts to rotate reversely. At time t13, all engagements between the pinion pins 72 and the rack 55 are released (reset), and the driver blade 54 reaches the bottom dead center P3, and the misalignment is resolved.

[0113] At time t14, the solenoid current is turned on. At time t15, the feeder 92 is pulled back to position F1. At time t16, the rotation angle of the pinwheel 68 enters the range of the central angle θS, so that the restriction by the restricting member 102 is released. Note that the pinwheel 68 has been rotating in the reverse direction since time t12, but starts rotating forward from time t18. This causes the driver blade 54 to rise.

[0114] Here, from time t15 to time t19, the solenoid current is on, so that the feeder 92 is held at position F1. Therefore, even if the restriction by the restricting member 102 is released, the feeder 92 does not move toward the ejection part 42, so that the nails N are not loaded into the ejection part 42. In other words, it is possible to prevent multiple nails N from being loaded into the ejection part 42.

[0115] At time t19, the solenoid current is turned off. Then, the regulating member 102 regulates the movement of the feeder 92. As a result, at time t20, the feeder 92 is held at position F2. At time t21, the pinwheel 68 starts rotating forward, and the driver blade 54 is re-wound. At time t22, the driver blade 54 is stopped at the standby position P1.

[0116] <<Comparative Example to the First Embodiment>> In a comparative example (shown by a dashed line) of this embodiment, the solenoid current is off from time t14 to time t19. Therefore, when the restriction by the restricting member 102 is released at time t16, the feeder 92 moves to position F3, and the nail N is loaded. This may cause nail clogging even if the misalignment can be corrected.

[0117] <Summary> As described above, in the nail driver 10, when the first restricting unit 100 is displaced from the restricting position to the release position under a predetermined condition that eliminates the misalignment between the pinion pin 72 and the rack 55, the second restricting unit 120 restricts the movement of the feeder 92 in the K direction toward the ejection unit 42. In other words, even when the first restricting unit 100 is not restricting the movement of the feeder 92, the second restricting unit 120 restricts the movement of the feeder 92 in the K direction toward the ejection unit 42. This makes it possible to prevent the nail N from being unexpectedly supplied to the ejection unit 42, thereby improving the convenience of the nail driver 10.

[0118] For example, when the pinwheel 68 is being reversed to eliminate the misalignment, the solenoid 122 is turned on to hold the feeder 92, so that even if the first regulating portion 100 is in the release position while the pinwheel 68 is being reversed, the nail N can be prevented from being loaded.

[0119] In the nail driver 10, the solenoid 122 is not turned on while the striking unit 48 is performing a series of striking operations. This prevents the second restricting unit 120 from restricting the movement of the feeder 92 in the K direction toward the ejection unit 42 when the striking unit 48 is performing a series of striking operations.

[0120] In the nail driver 10, when the striking unit 48 executes a series of striking operations, the second restricting unit 120 stops operating when the first restricting unit 100 is displaced from the restricting position to the release position. This makes it possible to prevent the second restricting unit 120 from restricting the movement of the feeder 92 in the K direction toward the ejection unit 42 when the first restricting unit 100 releases the restriction on the movement of the feeder 92 during the series of striking operations by the striking unit 48.

[0121] In the nail driver 10, there is a possibility that the pinwheel 68 may become misaligned while rotating in the forward direction. When the pinwheel 68 is rotated in the reverse direction to eliminate the misalignment (missing) of the pinwheel 68, there is a possibility that the feeder 92 may move toward the ejection unit 42. Here, the second restricting unit 120 restricts the feeder 92 from moving in the K direction toward the ejection unit 42, thereby preventing the nail N from being unexpectedly supplied to the ejection unit 42.

[0122] In the nail driver 10, in a third operation in which the striking unit 48 and the rotating unit 66 are disengaged from each other in a series of striking operations and then re-engaged, the detection unit 128 detects whether there is a misalignment. If the detection unit 128 detects an abnormality in the third operation, the drive unit 56 reverses the rotating unit 66. This resets the combination of engagement between the pinion pin 72 and the rack 55, thereby eliminating the misalignment.

[0123] In the nail driver 10, the control unit 130 energizes the solenoid 122, which causes the solenoid 122 to move the feeder 92 to the side opposite the ejection unit 42 in the direction K. This eliminates the need to operate the second restriction unit 120 manually.

[0124] In the nail driver 10, the feeder 92 is biased toward the ejection unit 42 in the direction K by the solenoid spring 126. As a result, when the solenoid 122 is stopped, the feeder 92 is displaced toward the ejection unit 42, so that the feeder 92 is prevented from stopping midway in supplying the nails N to the ejection unit 42.

[0125] Second Embodiment Each process and operation of the nail driver 10 of the second embodiment will be described with reference to Fig. 13 and Fig. 14. Note that a description of configurations that are the same as or similar to the configuration of the nail driver 10 of the first embodiment (Fig. 1) will be omitted. Also, the description of the figure numbers showing each configuration will be omitted.

[0126] The control unit 130 controls the driving of the drive unit 56 in multiple modes, including a normal mode as a first mode in which the series of impact movements described above are performed, and a maintenance mode as a second mode in which a special operation different from the series of impact movements described above is performed.

[0127] In the special operation, the driving unit 56 drives the striking unit 48 for a time shorter than the driving time in the series of striking operations, and then stops. More specifically, when the trigger 116 is operated by the operator while the control unit 130 is in the maintenance mode, the striking unit 48 moves from the standby position P1 to the top dead center P2 (FIG. 9) in the opposite direction (upward) from the ejection unit 42 side in the vertical direction by the rotation of the rotating unit 66 in a state of being engaged with the striking unit 48. Next, the striking unit 48 moves from the top dead center P2 to the bottom dead center P3 (FIG. 9) on the ejection unit 42 side in the vertical direction by the biasing force of the striking force generating unit 32. The operations up to this point are the same as the series of striking operations.

[0128] The rotation of the rotating part 66 stops before the striking part 48 re-engages with the rotating part 66 and moves upward from the bottom dead center P3, or while the striking part 48 remains near the bottom dead center P3 even after re-engaging with the rotating part 66. In other words, the "special operation of the striking part 48" in the "second mode" refers to the operation of the striking part 48 moving from the standby position P1 through the top dead center P2 to the bottom dead center P3, and then stopping at or near the bottom dead center P3. The control part 130 can determine whether the striking part 48 is at or near the bottom dead center P3 by counting the amount of rotation of the motor 58.

[0129] Each process shown in Fig. 13 is performed by the processor in the control unit 130 reading out a processing program from memory, expanding it in a part of the memory, and executing it. Note that steps similar to those in Fig. 11 are given the same reference numerals as in Fig. 11 and descriptions thereof will be omitted. The operator switches to the maintenance mode by operating a switch (not shown).

[0130] In step S12, the control unit 130 selects the normal mode. Then, the process proceeds to step S13. In step S13, the control unit 130 determines whether or not to execute a maintenance mode operation. If the maintenance mode is selected by the operation of the worker (S13: Yes), the process proceeds to step S15. If the maintenance mode is not selected (S13: No), the process proceeds to step S18.

[0131] In step S15, the control unit 130 switches the operation mode of the nail driver 10 to the maintenance mode, and then proceeds to step S26.

[0132] In step S32, the pinwheel 68 starts rotating forward. Then, the process proceeds to step S33. In step S33, the control unit 130 determines whether the motor 58 has rotated a predetermined amount of rotation. If the motor 58 has rotated the predetermined amount of rotation (S33: Yes), it is determined that the striking unit 48 is located at or near bottom dead center P3, and the process proceeds to step S35. If the amount of rotation of the motor 58 has not reached the predetermined amount of rotation (S33: No), the process proceeds to step S30.

[0133] In step S35, the driver blade 54 reaches the bottom dead center P3. Then, the process proceeds to step S37. In step S37, the control unit 130 turns off the solenoid 122. Then, the process proceeds to step S40. In step S40, the control unit 130 stops the operation of the pinwheel 68. Then, the process proceeds to step S12.

[0134] [Operation of the second embodiment] The operation of the second embodiment using the first restriction portion 100 and the second restriction portion 120 shown in Fig. 7 will be described with reference to Fig. 14. In the description of Fig. 14, the components already described will be described with reference to Figs. 1 to 10, and individual figure numbers will be omitted. The operations from time t1 to time t9 shown in Fig. 14 are operations in the maintenance mode, and differ from the operations from time t1 to time t9 in the normal mode shown in Fig. 12.

[0135] At time t0, the striking unit 48 is at a standby position P1. The standby position P1 is located below the position PN of the upper end of the nail N. No nail N is loaded in the ejection port 47 of the ejection unit 42.

[0136] At time t1, the pinwheel 68 rotates forward, causing the driver blade 54 to start rising. From time t1 to time t7, the rotation angle of the pinwheel 68 gradually increases.

[0137] At time t1, the solenoid current is turned on and the feeder 92 starts moving to the other side in the K direction.

[0138] Between time t2 and time t4, the rotation angle of the pinwheel 68 is within the range of the central angle θS, so the restriction by the restricting member 102 is released. However, since the feeder 92 is held at position F2, the nail N is not loaded into the ejection section 42.

[0139] From time t5 to time t6, the driver blade 54 descends from the top dead center P2 to the bottom dead center P3. At this time, the feeder 92 is held on the other side in the K direction, and the nail N is not loaded, so the nail N is not struck.

[0140] At time t7, the solenoid current is turned off, and from time t7 to time t8, the feeder 92 is displaced from position F1 to position F2, and each configuration state is maintained until time t9.

[0141] As described above, in the nail driver 10 of the second embodiment, the predetermined condition is that the striking unit 48 is performing a special operation. In other words, in the maintenance mode of the nail driver 10, the solenoid 122 is turned on, so that the feeder 92 can be prevented from unintentionally moving in the K direction toward the ejection unit 42.

[0142] <<Comparative Example for the Second Embodiment>> In a comparative example (shown by a dashed line) of this embodiment, the solenoid current is off from time t1 to time t7. Therefore, when the restriction by the restricting member 102 is released at time t3, the feeder 92 moves to position F3, and the nail N is loaded. This causes the nail N to be struck by the driver blade 54, which may result in unexpected ejection of the nail N or clogging of the ejection section 42.

[0143] Third Embodiment Each process and operation of the nail driver 10 of the third embodiment will be described with reference to Fig. 15 and Fig. 16. Note that a description of configurations that are the same as or similar to those of the nail driver 10 of the first and second embodiments will be omitted. Also, the description of the drawing numbers showing each configuration will be omitted.

[0144] In the nail driver 10 of the third embodiment, in the maintenance mode, the claw member 86 (FIG. 4) can be displaced between an engagement position and a release position in conjunction with the operation of a solenoid (not shown). When the claw member 86 is in the engagement position, the nail N is engaged with the claw member 86, thereby restricting the movement of the nail N toward the ejection unit 42. When the claw member 86 is in the release position, the nail N can be moved toward the ejection unit 42.

[0145] Each process shown in Fig. 15 is performed by the processor in the control unit 130 reading a processing program from the memory, expanding it in a part of the memory, and executing it. Note that the same steps as those in Fig. 11 and Fig. 13 are denoted by the same reference numerals as those in Fig. 11 and Fig. 13, and the description thereof will be omitted.

[0146] After the maintenance mode is set in step S15, step S26 is executed. In step S26, the control unit 130 judges whether the push lever 44 is pressed against the target material G and the trigger 116 is on. If the positive state is met (S26: Yes), the process proceeds to step S27. If the negative state is met (S26: No), the process proceeds to step S15.

[0147] In step S27, the control unit 130 turns off a solenoid (not shown) to move the claw member 86 to the release position. Then, the process proceeds to step S30. In step S30, the feeder 92 moves (is pulled back) to the side opposite the ejection unit 42 in the K direction. Then, the process proceeds to step S31.

[0148] In step S31, the control unit 130 waits until a predetermined time has elapsed. For example, the control unit 130 waits for a time period corresponding to the period from time t4 to time t5 in FIG. 16. At this time, the nail N retreats from the ejection port 47 of the ejection unit 42 to the other side in the K direction. Then, the process proceeds to step S32.

[0149] After executing step S37, the process proceeds to step S39. In step S39, the control unit 130 turns on a solenoid (not shown) to move the claw member 86 to the locking position. Then, the process proceeds to step S40. In step S40, the rotation of the pinwheel 68 is stopped. Then, the process proceeds to step S12.

[0150] [Operation of the third embodiment] In the explanation of Fig. 16, for each configuration already explained, reference will be made to Fig. 1 to Fig. 10, and description of individual figure numbers will be omitted. Each operation from time t1 to time t13 shown in Fig. 16 is an operation in the maintenance mode, and differs from the operation from time t1 to time t9 in the maintenance mode shown in Fig. 14.

[0151] At time t0, the driver blade 54 (striking portion 48) is at a standby position P1. The standby position P1 is located above the position PN of the upper end of the nail N. The nail N is present at the ejection port 47 of the ejection portion 42. The nail member 86 is engaged with the nail N.

[0152] At time t1, a solenoid (not shown) is turned off, starting an operation to release the locked state of the claw member 86. At time t2, the lock of the claw member 86 is released.

[0153] At time t3, the solenoid current is turned on, and the feeder 92 starts moving from position F3 to the other side in the K direction. At time t4, the feeder 92 reaches position F1. This removes the nail N from the ejection port 47 of the ejection unit 42. In other words, there is no nail N in the ejection port 47 after time t4.

[0154] At time t5, the pinwheel 68 starts rotating in the normal direction, and the driver blade 54 starts to rise. At time t6, the driver blade 54 reaches top dead center P2. Then, as the pinwheel 68 continues rotating in the normal direction, the driver blade 54 descends from top dead center P2 to bottom dead center P3 between time t6 and time t7. At this time, since there is no nail N at the injection hole 47, the nail N is not driven in.

[0155] At time t8, the solenoid current is turned off. Then, from time t8 to time t9, the feeder 92 moves from position F1 to position F2. At time t9, the regulating member 102 engages with the feeder 92. As a result, the feeder 92 is held at position F2.

[0156] At time t10, a solenoid (not shown) is turned on, and the claw member 86 starts moving toward the locking position. Then, at time t11, the claw member 86 is locked with the nail N. At time t12, the forward rotation of the pinwheel 68 is stopped. Then, each configuration state is maintained until time t13.

[0157] As described above, in the nail driver 10 of the third embodiment, the driver blade 54 is displaced to the bottom dead center P3 with the nail N removed from the ejection portion 42, so that the driver blade 54 can reach the bottom dead center P3 without driving the nail N into the nail driver 10.

[0158] [Modifications of this embodiment] This embodiment is not limited to the above-mentioned first, second, and third embodiments, and can be modified in various ways without departing from the spirit of the present invention. Modifications of this embodiment will be described below.

[0159] The predetermined condition does not have to include the drive unit 56 driving the striking unit 48 when the striking unit 48 is not performing a series of striking operations. The second restricting unit 120 does not have to stop operating when the first restricting unit 100 is displaced from the restricting position to the release position. The predetermined condition does not have to include the rotation unit 66 reversing. The predetermined condition does not have to be that the striking unit 48 is not performing a special operation.

[0160] When the detection unit 128 detects an abnormality in the third operation of the striking unit 48, the driving unit 56 does not have to reverse the rotation unit 66. In the special operation, the driving unit 56 does not have to stop driving the striking unit 48 after driving the striking unit 48 for a time shorter than the driving time in the striking operation.

[0161] The second restriction portion 120 is not limited to having the solenoid 122, but may have a motor and a link mechanism.

[0162] Instead of the feeder biasing portion (solenoid spring 126), a spring that pulls the feeder 92 toward the ejection portion 42 may be provided.

[0163] The maintenance mode may be configured to perform a special operation different from the series of striking operations when a second operation different from a first operation performed by an operator on the trigger 116 when performing a series of striking operations in the normal mode is performed on the trigger 116. Here, the "first operation" means an operation in which the operator continues to press the trigger 116, and the "second operation" means an operation in which the operator alternately repeats an operation of pressing the trigger 116 and an operation of releasing the trigger 116. In this case, the "special operation of the striking unit 48" by the "second operation" means an operation in which the pinwheel 68 rotates little by little by the second operation. In this configuration, when the operator performs the second operation, the pinwheel 68 stops after rotating for a short time, so that the striking unit 48 can be stopped at the bottom dead center P3 by repeating the second operation and stopping the second operation when the striking unit 48 moves from the top dead center P2 to the bottom dead center P3. [Explanation of symbols]

[0164] 10...nail gun, 12...housing, 14...cylinder portion, 16...motor portion, 18...handle portion, 19...trigger switch, 24...extension portion, 26...mounting portion, 28...battery pack, 32...impact force generating portion, 36...cylinder, 37...piston chamber, 38...pressure accumulator container, 38A...pressure accumulator chamber, 39...damper, 42...ejection portion, 44...push lever, 46...ejection passage, 47...ejection port, 48...impact portion, 52...piston, 54...driver blade, 54A...upper end portion, 55...rack, 55A...rack, 55B...rack, 55C...rack, 55D...rack, 55E...rack, 55F...rack , 55G...rack, 55H...rack, 55I...rack, 55J...rack, 55K...rib, 56...drive unit, 58...motor, 58A...output shaft, 58B...rotor, 62...reduction mechanism unit, 64...drive shaft unit, 66...rotating unit, 68...pinwheel, 70...supply unit, 72...pinion pin, 72A...pinion pin, 72B...pinion pin, 72C...pinion pin, 72D...pinion pin, 72E...pinion pin, 72F...pinion pin, 72G...pinion pin, 72H...pinion pin, 72I...pinion pin, 72J...pinion pin, 74...magazine, 75...drum unit, 76 ...guide portion, 77...pin, 78...lid portion, 82...supply passage, 84...rotating shaft, 86...claw member, 86A...base portion, 86B...plate portion, 86C...claw portion, 88...spring, 89...rotating shaft, 92...feeder, 94...movable member, 94A...fixed portion, 94B...contact portion, 94C...shaft portion, 96...feeding member, 96A...first claw portion, 96B...second claw portion, 98...spring, 100...first regulating portion, 102...regulating member, 102A...base portion, 102B...arm portion, 102C...projection portion, 102D...acting portion, 102E...input portion, 104...switching member, 104A...extending portion, 104B...contact portion, 104C...forced portion portion, 105...guide member, 106...urging portion, 107...first spring, 108...second spring, 109...wall portion, 111...wall portion, 112...cam, 112A...outer peripheral surface, 113...notch portion, 113A...first cam surface, 113B...second cam surface, 116...trigger, 120...second regulating portion, 122...solenoid, 124...plunger, 126...solenoid spring, 128...detection portion, 130...control portion, 132...rotational position detection circuit, 134...rotation amount detection circuit, 136...blade detector switch, 138...blade detector switch operation detection circuit, 142...main body circuit portion,144... inverter circuit, 146... first drive unit, 147... control signal output circuit, 148... second drive unit, 152... solenoid control signal output circuit, 153... switching element, 154... voltage detection circuit, 155... first current detection circuit, 156... second current detection circuit, 158... power switch circuit, 159... power supply voltage supply circuit, 161... trigger switch operation detection circuit, 162... push switch, 163... push switch operation detection circuit, C... center of rotation, F1... position, F2... position, F3... position, G... opposing material, H... magnetic sensor, K... direction, M... connecting portion, N... nail, P1...waiting position, P2...top dead center, P3...bottom dead center, PA...first intermediate position, PB...second intermediate position, PN...position, S...range, t0...time point, t1...time point, t2...time point, t3...time point, t4...time point, t5...time point, t6...time point, t7...time point, t8...time point, t9...time point, t10...time point, t11...time point, t12...time point, t13...time point, t14...time point, t15...time point, t16...time point, t17...time point, t18...time point, t19...time point, t20...time point, t21...time point, t22...time point, θ1...rotation angle, θ2...rotation angle, θ3...rotation angle, θ4...rotation angle, θS...central angle,

Claims

1. an ejection unit that ejects the fastener; a striking portion that strikes the stopper located in the ejection portion; A drive unit that drives the striking unit; a magazine supporting a plurality of said fasteners; a feeder that moves toward the ejection unit in a first direction to supply the fasteners supported by the magazine to the ejection unit; a first restricting portion that is displaceable between a restricting position that restricts the movement of the feeder toward the ejection portion in the first direction and a release position that does not restrict the movement of the feeder toward the ejection portion in the first direction in response to the movement of the impact portion by the drive portion; a second regulating portion that operates when the first regulating portion is displaced from the regulating position to the release position under a predetermined condition to thereby regulate the movement of the feeder in the first direction toward the injection portion; A work machine having the above structure.

2. The drive unit moves the striking unit to a first position before striking, The striking portion is capable of executing a series of striking operations in which the striking portion moves from the first position to strike the fastener, and then returns to the first position again by being driven by the driving portion, the predetermined condition includes the driving unit driving the striking unit when the striking unit is not performing the series of striking motions. The work machine according to claim 1.

3. When the first regulating portion is displaced from the regulating position to the release position during the series of striking operations, the second regulating portion stops the operation of regulating the movement of the feeder. The work machine according to claim 2.

4. the drive unit has a rotation unit that moves the striking unit to the first position by rotating in a first rotation direction during the series of striking motions, The predetermined condition includes that the rotating portion rotates in a second rotation direction that is opposite to the first rotation direction. The work machine according to claim 2.

5. The striking portion is engageable with the rotating portion, an impact force generating unit that biases the impact portion toward the ejection portion in a second direction that intersects with the first direction; An operation unit operated by an operator; a detection unit that detects whether or not there is an abnormality in the engagement between the striking unit and the rotating unit; and In the series of striking motions, the striking section a first action in which, when the operating unit is operated, the rotating unit rotates while engaged with the operating unit, thereby moving the operating unit from the first position to a second position in the second direction against the biasing force of the striking force generating unit; a second action in which the engagement with the rotating part is released as the rotating part rotates, and the striking force generating part moves from the second position to a third position on the ejection part side in the second direction by the biasing force of the striking force generating part to strike the stopper; a third action of moving from the third position to the first position in a direction opposite to the ejection unit in the second direction against the biasing force of the impact force generating unit by rotating the rotating unit while being engaged with the rotating unit again; When the detection unit detects an abnormality during the third operation, the drive unit rotates the rotation unit in the second rotation direction. A work machine according to claim 4.

6. An operation unit operated by an operator; A control unit that controls the driving of the driving unit in a plurality of modes including a first mode and a second mode, the drive unit causes the striking unit to execute the series of striking motions when an operator operates the operation unit while the control unit is in the first mode, and causes the striking unit to execute a special motion different from the series of striking motions when an operator operates the operation unit while the control unit is in the second mode, The work machine according to claim 2 , wherein the predetermined condition is that the striking unit is currently performing the special operation.

7. The work machine according to claim 6 , wherein the drive unit drives the striking unit in the special operation for a period of time that is shorter than a driving time in the series of striking operations, and then stops.

8. The work machine according to claim 1 , wherein the second regulating portion has a solenoid that, when energized, moves the feeder to an opposite side to the injection portion in the first direction.

9. The work machine according to claim 1 , further comprising a feeder biasing section that biases the feeder toward the injection section in the first direction.

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