JP5234427B2 - Fastener driving machine - Google Patents

Description

  The present invention relates to a fastener driving machine for driving fasteners such as nails, scissors, and staples into a workpiece, and more particularly, to a fastener driving machine having a mechanism for preventing an empty shot of a fastener.

  Conventionally, a driving mechanism such as a compressed air type, a combustion type, a coil spring type, etc. is used to apply a reciprocating motion to a driver bit (driver blade) to drive a fastener such as a nail, a hook or a staple into a workpiece. Embedded machines are known.

  Such a fastener driving machine has a fastener supply section including a magazine for loading a plurality of fasteners such as screws and nails connected to each other by a resin sheet or the like, The fastener supply unit is engaged with a nose portion attached to the driving machine main body, and sequentially supplies the fasteners to the nose portion. As a result, the fasteners loaded in the nose portion are sequentially driven by the reciprocating motion of the driver bit.

  Also, the driving mechanism of the driving machine body that gives the driving reciprocating motion is the mechanical link mechanism operation based on the cooperative operation of the push lever pressing operation and the trigger lever pulling operation, or the electric circuit operation based on both lever operation. Is configured to activate the driving mechanism of the driver bit. Therefore, when the push lever or trigger lever is pressed while the fastener loaded in the fastener supply portion is empty and no fastener is loaded in the nose portion, the driver bit empties the nose injection hole in the nose portion. I will hit it. When such a driver biting phenomenon is caused by the driver bit, the tip of the driver bit may protrude from the injection port of the nose portion, and there is a risk of damaging wood or gypsum board as a workpiece.

  In order to solve this problem, a fastener driving machine provided with an idle driving prevention mechanism is well known. This type of idling prevention mechanism is provided in the feeder section when the remaining amount of the fasteners loaded in a connected manner in the magazine becomes a predetermined amount or less and the feeder member in the fastener supply section advances to a predetermined position. The lock arm that is moved by being pushed by the provided feeder engaging portion prohibits the movement of the push lever and stops the driving mechanism of the driver bit.

  In addition, as another conventional technology, in order to visually check the remaining amount of fasteners such as nails or screws, a product in which a magazine part for containing the fasteners and a member for guiding the fasteners to the injection holes are molded from transparent plastic It has been known.

  However, according to the conventional blanking prevention mechanism, the blanking operation can be prevented when the remaining amount fastener loaded in the magazine becomes a predetermined amount or less, but the workpiece is not used like a screw driving operation on the ceiling or the like. Since there is a case where the driving operation is performed while holding down, if the idle driving prevention mechanism operates during the completion of one driving operation, it may be inconvenient to load the fastener into the magazine and support the workpiece. It becomes impossible. In other words, it may be impossible to interrupt the driving operation by operating the idle driving prevention mechanism in the middle of a certain driving operation.

  In addition, when the operator performs a driving operation while visually confirming the remaining remaining amount of fasteners such as nails or screws by a driving machine using a transparent plastic member as in the prior art, the operator It was necessary to always be aware of the remaining amount of equipment.

  Therefore, an object of the present invention is to operate the blanking prevention mechanism when the remaining amount fastener loaded in the magazine unit or the feeder unit becomes a predetermined amount or less, and an operator can use such a blanking prevention mechanism. An object of the present invention is to provide a fastener driving machine capable of driving a remaining amount of fastener below a predetermined amount by releasing the operation.

  In order to achieve the above object, the outline of a representative one of the inventions disclosed in the present application will be described as follows.

  According to one aspect of the present invention, there is provided a driver bit having a driver bit for driving a fastener, a driving mechanism for giving a reciprocating motion to the driver bit, guiding the reciprocating motion of the driver bit, and A nose part having a nose injection hole to which a fastener is supplied, a fastener supply part connected to the nose part for supplying a plurality of the fasteners to the nose injection hole, and controlling activation of the drive mechanism A push lever and a trigger lever, and a blanking prevention mechanism portion for locking the operation of the push lever or the trigger lever when the remaining amount of the fastener supply portion decreases below a predetermined amount. In the fastener driving machine provided, the idle driving prevention mechanism includes a first lock member and a second lock member supported by the first lock member, and the inside of the fastener supply unit. When the loaded remaining amount fastener is reduced below a predetermined amount, the first lock member and the second lock member work together to lock the operation of the push lever or trigger lever, and the push lever Alternatively, when it is desired to unlock the trigger lever, the lock is released by operating the second lock member.

  According to another feature of the invention, the second locking member is supported on the first locking member so as to be operable from a first position to a second position, and is provided in the fastener supply section. When the loaded remaining amount fastener is reduced to a predetermined amount or less, the unlocking is performed by operating from the first position to the second position.

  According to still another aspect of the present invention, a driver bit having a driver bit for driving a fastener, a driving machine body having a driving mechanism for reciprocating the driver bit, and guiding the reciprocating motion of the driver bit, And a nose part having a nose injection hole to which a fastener is supplied, a fastener supply part connected to the nose part for supplying a plurality of the fasteners to the nose injection hole, and activation of the drive mechanism A push lever and a trigger lever for controlling, and when a remaining amount fastener of the fastener supply unit is reduced below a predetermined amount, an idle driving prevention mechanism unit for locking the operation of the push lever or the trigger lever; In the fastener driving machine comprising: a lock arm pressed by an elastic body in a moving direction that intersects with a feeding direction of the remaining amount fastener loaded in the fastener supply unit. One end portion of the lock arm is secondly moved from the first pressing position in the moving direction by the pressing force of the elastic body when the remaining amount fastener loaded in the fastener supply unit becomes a predetermined amount or less. A lock arm movable to the pressing position of the lock arm, and a lock lever connected to the lock arm and slidably held on the lock arm in the same direction as the movement direction of the lock arm. The lever includes a lock striking prevention mechanism comprising a lock lever supported so that the lever can be operated from the first position to the second position on the lock arm when the lock arm is in the second pressing position. Further, the idle driving prevention mechanism holds the lock lever in the first position when the remaining amount fastener loaded in the fastener supply unit becomes a predetermined amount or less. In this state, the operation of the push lever from the front position to the rear position or the operation of the trigger lever is locked by moving the lock arm to the second pressing position by the elastic body. .

  According to still another aspect of the present invention, when the remaining amount fastener mounted in the fastener supply unit is reduced to a predetermined amount or less, the idle driving mechanism is operated to operate the push lever or the trigger. When the operation of the lever is locked, the lock lever is operated from the first position to the second position so that the lock can be released.

  According to the above feature of the invention, the idle driving prevention mechanism includes a first lock member (or lock arm) and a second lock member (or lock arm) supported by the first lock member (or lock arm). A first lock member (or a lock arm) and a second lock member (when the remaining amount fastener loaded in the fastener supply unit is reduced to a predetermined amount or less). Or the lock lever) cooperates to lock the operation of the push lever or trigger lever, and when it is desired to unlock the push lever or trigger lever, only the second lock member (or lock lever) is operated. So that when the remaining amount fastener is reduced to a predetermined amount or less, the unlocking is performed while the unlocking is performed. It can be completed implanted amount fasteners.

Further, according to the above feature of the present invention, the second lock member (or lock lever) can be formed to be slidable with one hand holding the driving machine body or the trigger lever, so that unlocking is facilitated, It is also possible to effectively utilize the remaining amount fasteners of a predetermined amount or less loaded in the magazine unit. Thereby, working efficiency can be improved.
In particular, according to the above-mentioned feature of the present invention, the second lock member (or lock lever) can be formed to be slidable by the middle finger or index finger of the right hand or the left hand that holds the driving machine main body. It becomes extremely easy and the workpiece or the like can be supported by the opposite hand that does not hold the driving machine main body.

  The above and other objects, and the above and other features of the present invention will become more apparent from the following description of the present specification and the accompanying drawings.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which a fastener driving machine according to the present invention is applied to a compressed air screw driving machine will be described with reference to the drawings. Note that components and elements having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof is omitted. Further, in the following description of the nail driving machine according to the embodiment of the present invention, the direction in which the fastener is driven for convenience in a state where the screw or nail is driven in the horizontal direction by the screw driving machine. Is expressed as “left direction or right direction”, but is not limited to a specific embodiment or intention. In a state in which the direction in which the fastener is driven is installed in the vertical direction, it can be described as “lower or lower” and the opposite direction as “upper or upper”, which both limit the gist of the present invention. Not what you want.

  1 is an overall front view (including a partial cross section) of the screw driving machine according to the embodiment, and FIG. 2 is an overall rear view (outside view) of the screw driving machine according to the embodiment shown in FIG. The direction in which the fastener is driven is shown as the direction from the left hand side to the right hand side (right direction) as opposed to the direction from the right hand side to the left hand side (left direction) in FIG.

[Overall configuration of the driving machine]
The fastener driving machine 1 includes a driving machine body 2, a nose part 3, a magazine part 5, and a feeder part 51. The driving machine main body 2 forms a part that surrounds the drive mechanism 30 of the driver bit 11 such as the cylinder 6 and the piston 7, and a part of the handle part 8 and the pressure accumulating chamber 14 for gripping the driving machine 1. It is surrounded by a housing part 9 consisting of a part.

  The drive mechanism unit 30 includes an air motor 31 that is rotationally driven by compressed air, a planetary gear device 32, and a bottomed cylindrical rotating body 33 that is rotated via the planetary gear device 32 by the rotational force of the air motor 31. . Further, a pair of recesses 34 extending in the axial direction is provided on the inner wall of the rotating body 33. A rotating slide member 36 having a pair of convex portions 35 fitted in the concave portion 34 is provided in the rotating body 33 so as to be movable in the axial direction. The rotary slide member 36 is provided with an air blocking portion 36a.

  Further, the drive mechanism unit 30 includes a cylinder 6 and a piston (main piston) 7. The piston 7 includes a piston portion (sub piston) 38 on the left side (downward) of the rotary slide member 36, and is slidably provided in the cylinder 6 so as to reciprocate in the left-right direction. A driver bit 11 is mounted on the sub piston portion 38 that the piston 7 contains, and the driver bit 11 is screwed (fastened) into the nose portion 3 disposed at one end of the main body 2 by the reciprocating motion of the piston 7. The tool 15 is injected into a workpiece (not shown) such as wood or gypsum board. A known O-ring 7 a made of a flexible material such as rubber is provided on the outer periphery of the piston 7 in order to seal the piston 7. As for the structure of the drive mechanism unit 30 itself described here, the technology previously filed by the applicant of the present application and published in Japanese Patent Application Laid-Open No. 2005-103727 can be employed.

  A nose portion 3 is provided on the left side of the cylinder 6. The nose portion 3 has a nose injection hole 3 a that guides the driver bit 11 when the driver bit 11 moves together with the piston 7 leftward in the axial direction (bottom dead center side). A screw (fastener) 15 loaded in the nose injection hole 3a is driven by a driver bit 11 into a workpiece such as wood or gypsum board.

  The magazine unit 5 and the feeder unit 51 constitute a fastener supply unit. In the magazine portion 5, a plurality of connection type screws (connection fasteners) 15 are loaded in a spiral shape, for example. The plurality of connecting fasteners 15 loaded in the magazine part 5 are supplied to the nose part 3 from the one end part 5a of the magazine part 5 via the feeder part 51 in a direction intersecting with the extending direction of the nose injection hole 3a. The The other lower end portion of the magazine portion 5 is attached to the handle portion 8 of the driving machine body 2 by a fastener (bolt / nut) 13. At one end portion 5a of the magazine portion 5, a plurality of connected screws 15 loaded in the magazine portion 5 are pressed into the nose injection hole 3a, and the remaining amount after the fastener is driven into the nose injection hole 3a. A feeder (claw feed portion) 51f for advancing the fastener 15 to the nose injection hole 3a is mounted.

  The feeder 51f is urged in the direction of the nose injection hole 3a of the nose portion 3 by the feed spring 51a, and the feed piston 51c is pushed down by the compressed air that has entered the feed piston chamber 51b from the return chamber 22 to be described later. The feeder 51f engaged with 51c grasps the second fastener 15, and presses the connecting fastener 15 toward the nose injection hole 3a by the urging force of the feed spring 51a. Thus, when the loaded connecting fasteners 15 are sequentially driven and consumed, the remaining amount fastener 15 is advanced in the direction toward the nose injection hole 3a, so that the remaining amount fastener is always in the nose injection hole 3a. 15 is loaded.

  One end portion (lower end portion) of the handle portion 8 is provided with an air plug 10 and covered with a dust cap 12 for preventing dust intrusion, but when operating the driving machine body 2, the dust cap 12 is removed, An air hose from an air compressor (not shown) is connected to the air plug 10, and compressed air is supplied to activate the drive mechanism unit 30.

  Compressed air serving as a driving source for the piston 7 is stored in the pressure accumulating chamber 14 in the driving machine main body 2 through the air plug 10. As described above, the head of the screw 15 loaded into the nose portion 3 from the magazine portion 5 through the feeder portion 51 is sequentially struck by the compressed air by the distal end portion of the drive bit 11.

  A sleeve valve 16 made of a flexible material is accommodated on the right side (top dead center side) of the cylinder 6 so as to be slidable in the left-right direction (up-down direction) on the inner wall surface of the partition part 9a. The sleeve valve 16 is urged to the right dead center side (top dead center side) by the pressing force of the valve spring 16a and the pressing force of compressed air flowing into the head valve control passage (not shown) communicating with the trigger valve portion 17. Has been.

  The operation unit operated by the operator protrudes from the trigger lever 18 that rotates about the rotation shaft 18a, the arm plate 19 that is rotatably attached to the trigger lever 18, and the tip of the nose injection hole 3a. A push lever 20 extending to the vicinity of the arm plate 19 so as to be engaged with the arm plate 19 is provided, and the trigger lever 18 can be operated by linking to the pressing operation of the push lever 20. That is, the opening and closing of the trigger valve portion 17 is controlled by the operation of the trigger lever 18 that cooperates with the pressing operation of the push lever 20 to the rear position, and the reciprocating motion of the piston 7 is activated.

  As shown in the rear view of FIG. 2, the push lever 20 extends from the front end portion 20a to the rear end portion 20b on the back side of the nose portion 3 in parallel with the extending direction of the nose injection hole 3a. An adjuster portion 21 for adjusting the position of the push lever 20 in the left-right direction (vertical direction) is attached to the rear end portion (left end portion in FIG. 2) of the push lever 20. The entire push lever 20 is urged forward from the most distal end portion of the nose portion 3 by an urging spring 21 a provided in the adjuster portion 21. When the tip 20a of the push lever 20 is pressed against the workpiece in a normal state, the tip 20a moves backward to a rear position near the tip of the nose portion 3 (nose injection hole 3a). As shown in FIG. 8, the movement of the front end 20 a moves the entire push lever 20 toward the trigger lever 18, the push lever rear end 20 b engages with the arm plate 19, and the trigger lever 18 performs a starting operation. Is possible.

  Referring to FIG. 1 again, a control passage (not shown) for pressing the sleeve valve 16 is connected to the trigger valve portion 17, and according to the left and right opening / closing (up / down opening / closing) of the plunger 17 a of the trigger valve portion 17. It communicates with the external air of the main body 2 or the compressed air accumulated in the pressure accumulating chamber 14. More specifically, the plunger 17a cooperates with the valve piston provided in the trigger valve portion 17, and communicates the sleeve valve control passage to the atmosphere in accordance with the left-right movement (vertical movement) of the plunger 17a. Or it is made to communicate with the pressure accumulation chamber 14 filled with compressed air.

  That is, as shown in FIG. 1, when the plunger 17a is in the left state (downward state), in other words, when it is urged to the left position (downward position) by the coil spring in the trigger valve portion 17, The sleeve valve control passage communicates with the pressure accumulating chamber 14 and is supplied with compressed air. On the contrary, when the plunger 17a is pulled rightward (upward) by the arm plate 19 and the trigger lever 18, the control passage for pressing the sleeve valve 16 is connected with the external atmosphere in the vicinity thereof via the trigger valve portion 17. Communicate.

  More specifically, in a state as shown in FIG. 8, the push lever 20 is pressed by the workpiece, the push lever 20 is moved backward, and the arm plate 19 is pushed up by this. When the trigger lever 18 is further pulled in the direction of the trigger valve 17 (upward) by the operator, the plunger 17a is pushed rightward (upward) as described above, and the sleeve valve control passage is It communicates with the atmosphere through part 17. As a result, the sleeve valve 16 moves to the top dead center side, the piston upper chamber 27 partitioned by the piston 7 and the sleeve valve 16 is communicated with the pressure accumulating chamber 14, and compressed air is transferred from the pressure accumulating chamber 14 to the piston of the piston 7. This is supplied to the chamber 27, and the piston 7 is moved downward (leftward in FIG. 1) to give a striking force to the driver bit 11 that is integrally attached to the piston 7.

  In such driving operation of the driver bit 11, the rotational force of the air motor 31 is transmitted to the rotating body 33 via the planetary gear device 32 and further to the rotating slide member 36 included in the rotating body 33. In addition to the reciprocating motion in the axial direction, the bit 11 is given a rotational motion about the shaft center. Thereby, the driver bit 11 can screw the screw 15 into the workpiece.

  The left end (lower end) of the cylinder 6 is provided with an impact relaxation bumper 25 for absorbing the surplus energy of the piston 7 after the screw 15 is driven. A part of the bumper 25 is larger in diameter than the inner diameter of the cylinder 6 so that the shock relaxation bumper 25 does not move to the top dead center side of the cylinder 6.

  A return air chamber 22 for returning the piston 7 from the bottom dead center to the top dead center is provided on the outer periphery of the left end (lower end) of the cylinder 6, and the direction of the return air chamber 22 from the cylinder 6 during the reciprocating stroke of the piston 7 is provided. An air passage 23 having a check valve 23 a that communicates only with the cylinder is provided, and an air passage 24 that communicates the cylinder 6 with the return air chamber 22 is provided on the outer periphery of the lower end of the cylinder 6.

[Configuration of the mechanism for preventing blank shots]
Next, the structure of the idle driving prevention mechanism unit 50 according to the present invention will be described with reference to the front view of FIG. 1 and the side view of FIG. 3 (side view from the direction AA of FIG. 1).
As shown in FIG. 3, the basic configuration of the idle driving prevention mechanism unit 50 includes a first lock member 52 and a second lock member 53 held by the first lock member 52. When the remaining amount fastener (screw) 15 loaded in the fastener supply unit (magasin unit) 5 is reduced to a predetermined amount or less (for example, four or less) in the feeder unit 51, the first lock The member 52 and the second lock member 53 cooperate to lock the operation of the push lever 20 or the trigger lever 18. Further, when the lock of the push lever 20 or the trigger lever 18 is to be released, the lock release is performed by operating only the second lock member 53 from the lock position to the lock release position. A structural example of the first lock member 52 and the second lock member 53 will be described in more detail with reference to FIG.

  The lock arm 52, which is the first lock member, extends from the one end 52a to the other end 52b. Further, as shown in FIG. 5, an intermediate part (upper part) 52d of the lock arm 52 is formed in the Y direction by a holding hole (through hole) 51e of the lock arm holding member 51d attached to the nose part 3 or the feeder part 51. It is slidably supported (in the left-right direction). On the other hand, the lower part of the lock arm 52 is always urged in the Y direction (direction of the screw 15) by the coil spring 52c. As a result, as shown in FIG. 6, the one end portion 52 a of the lock arm 52 has a remaining amount of fasteners 15 of a predetermined amount or less (for example, when there are four screws). ), And slides in the through hole 51e from the position y1 in the Y direction to the position y2 by the pressing force of the coil spring 52c. That is, the lock arm 52 can be translated in the Y direction depending on the presence or absence of the remaining screw 15 of a predetermined amount or less.

  Further, as shown in FIG. 3, the other end portion 52 b facing the one end portion 52 a of the lock arm 52, which is in contact with the screw 15, is slidable in the Y direction (left-right direction) in the drawing. A lock lever 53 as a second lock member is engaged. As shown in FIG. 4, the lock lever 53 is provided with a steel ball 53c pressed against the lock arm 52 by a coil spring 53a. The lock lever 53 can be slidably moved on the surface of the lock arm 52 by the action of the steel ball 53c pressed by the coil spring 53a.

  As shown in FIG. 4A, a lock lever (second lock member) 53 for fixing a lock lever (second lock member) 53 to a predetermined position on the surface of the lock arm (first lock member) 52 by a steel ball 53c. Two concave portions 52e and 52f (same as the positions 52e and 52f) are provided for defining a first position (lock position) 52e and a second position (lock release position) 52f, respectively.

  Further, as shown in FIG. 4B, the lock lever 53 is held in a state of being inserted into the housing of the lock arm 52, and is pressed by the middle finger or index finger of the right hand or the left hand holding the handle portion 8. Then, it can be moved from the first position (lock position) 52e to the second position (unlock position) 52f, or can be returned from the second position 52f to the first position 52e. Has been.

  Such a lock arm 52 is disposed at the upper part of the feeder unit 51. The moving direction of the lock arm 52 is a direction that intersects the direction in which the handle extends and the direction in which the fastener is driven. Therefore, the lock lever 53 can be easily slid and moved by the middle finger or index finger of the gripped hand while the operator grips the handle portion 8. As described above, the movement of the fixed position is configured so that the operator can easily slide and move with the finger of one hand (one hand side) holding the handle portion 8 of the main body 2. The invention becomes more effective.

  On the other hand, the push lever 20 is engaged with the end portion (engagement portion or stopper portion) 53d of the lock lever 53 in the middle from the front end portion 20a extending in the extending direction of the nose injection hole 3a to the rear end portion 20b. When the lock lever (second lock member) 53 is fixed at the first position 52e on the lock arm, the engagement portion 53d of the lock lever 53 is pushed. The lever 20 is engaged with the engaging portion 20 c to function as a stopper in the push movement direction of the push lever 20.

[Operation of the anti-blank mechanism]
Next, the operation of the idle driving prevention mechanism unit 50 will be described with reference to FIGS. 3 to 7 which are side views of the idle driving prevention mechanism unit 50 viewed from the AA direction shown in FIG.
1. As shown in FIG. 3, a plurality of fasteners (screws) 15 are loaded in the feeder 51, and the remaining amount of the fasteners is prevented by the idle driving mechanism 50. In a state (for example, 5) exceeding a predetermined amount (set amount) (for example, 4), the remaining screw 15 causes the one end 52a of the lock arm 52 to move to the right side position (lower side) of the inner space of the feeder unit 51. The dead point is moved to y1 (first pressing position).
At this time, as shown in FIG. 4, since the lock lever 53 is fixed to the first position 52e of the lock arm 52, the engaging portion 53d of the lock lever 53 is in contact with the convex portion 20c of the push lever. Absent. If the tip 20a of the push lever 20 is pressed against the workpiece or the like in this state, the engaging portion 53d of the lock lever 53 held by the other end 52b of the lock arm 52 is as shown in the rear view of FIG. The other end portion 20b of the push lever 20 can move to the rear position and can engage with the arm plate 19 of the trigger lever 18 without engaging the convex portion 20c of the push lever 20. Can be activated. As a result, when the trigger valve portion 17 is activated, the drive mechanism portion 30 such as the air motor 31 and the piston 7 described above is activated, and the screw 15 loaded in the nose injection hole 3a is driven onto the workpiece by the driver bit 11. Can be included.
2. When the remaining amount of the fasteners 15 loaded in the feeder 51 is reduced to a predetermined amount (for example, four) or less, as shown in FIG. The portion 52a is pressed to the top dead center y2 (second pressing position) in the fastener direction by the biasing force of the coil spring 52c. At this time, since the lock lever 53 is fixed at the first position 52e on the lock arm 52, as shown in FIG. 9, the engaging portion 53d of the lock lever 53 abuts on the convex portion 20c of the push lever. . Even when the push lever 20 is pressed in the direction of the trigger lever 18 in this state, in other words, even if the push lever 20 is pressed against the workpiece (not shown), the end 53d of the lock lever 53 does not protrude from the push lever 20. Since it exists in the movement path | route of the part 20c, the convex part 20c of a push lever cannot move to the back position direction of the push lever 20. FIG.

  Accordingly, the other end portion 20 b of the push lever 20 cannot be engaged with the arm plate 19, so that the trigger valve portion 17 cannot be activated by the trigger lever 18. That is, the driving mechanism 30 is prevented from starting and the fastener driving operation by the driver bit 11 is stopped.

When the state as shown in FIG. 6 is reached, if one or more of the set amount of fasteners is replenished in the feeder unit 51, the one end portion 52a of the lock arm 52 is attached to the loaded fastener as shown in FIG. Since it returns to the bottom dead center y1 on the right side in the figure by the diameter of 15, the end 53d of the lock lever 53 is disengaged from the convex portion 20c of the push lever 20, and the lock of the push lever 20 can be released. As a result, the fastener driving operation can be performed again.
Further, if the fixing position of the lock lever 53 is moved from the first position 53e to the second position 53f (to the left side in the figure) from the locked state shown in FIG. 6, as shown in FIG. Since the end portion 53d is disengaged from the engagement position with the convex portion 20c of the push lever 20, the push lever 20 can be unlocked and the fastener can be driven even when the remaining amount of the fastener is less than the set amount of four or less. It becomes.

  As is apparent from the above embodiment, according to the fastener driving machine having the idle driving prevention mechanism according to the present invention, the first lock member (locking) is established when the remaining amount fastener is in a state equal to or less than the set amount. If the second lock member (lock lever) held by the arm is moved to the lock position, the push lever or trigger lever can be prevented from moving in the rear position direction, and the fastener driving operation is stopped. Can be made. As a result, it is possible to prevent the fastener from being blown out and to prevent damage to the workpiece such as wood or gypsum board by the tip of the driver bit. Even when the idle driving prevention mechanism is in operation, if the second lock member (lock lever) is moved to the unlocking position, the locking function by the idle driving prevention mechanism is released. The remaining fastener can be driven in effectively.

  In the above embodiment, when the idle driving prevention mechanism portion is operated, the second locking member (lock lever) is configured to lock the pressing operation of the push lever in the front-rear movement direction. The trigger lever retracting operation may be configured to be locked. For example, the outer peripheral portion of the trigger member having the pivot shaft 18a (see FIG. 1) of the trigger lever that is rotated by the pull-in operation of the trigger lever can be configured to be locked by the second lock member.

  In the above embodiment, the first lock member (lock arm) and the second lock member (lock lever) are moved from the lock position to the lock release position, and the entire members are translated in a predetermined movement direction. However, both the locking members may be configured as a rotational movement about the rotation center.

  Furthermore, although the case of a screw as a fastener has been described, the present invention is applied to a fastener driving machine for driving a fastener other than a screw, such as a nail or a staple (a U-shaped fastener). Can do. Furthermore, even if the present invention is applied to a combustion type or electric type fastener driving machine other than the compressed air type, the same effects as the driving machine of the above-described embodiment can be obtained.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. .

The whole front view of the fastener driving machine which concerns on embodiment of this invention. The whole rear view of the fastener driving machine shown in FIG. The principal part side view from the AA direction of the fastener driving machine shown in FIG. 1 (when a residual amount fastener exceeds setting amount). FIG. 4 is a partial cross-sectional view of a lock arm and a lock lever shown in FIG. 3. FIG. 4 is an attachment structure diagram of the lock arm and the lock arm holding member shown in FIG. 3. The principal part side view from the AA direction of the fastener driving machine shown in FIG. 1 (when a residual amount fastener is below a setting amount). The principal part side view from the AA direction of the fastener driving machine shown in FIG. 1 (in the case of lock release). The whole rear view at the time of lock release of the push lever of the fastener driving machine shown in FIG. The whole rear view at the time of the lock of the push lever of the fastener driving machine shown in FIG.

1: Screw driving machine 2: Screw driving machine body 3: Nose part 5: Magazine part 6: Cylinder 7: Piston (main piston) 7a: O-ring 8: Handle part 9: Housing part 9a: Partition part 10: Air plug 11: Driver bit 12: Dust cap 13: Fastener (bolt / nut)
14: Pressure accumulation chamber 15: Connection fastener (screw) 16: Sleeve valve 16a: Valve spring 17: Trigger valve portion 17a: Plunger 18: Trigger lever 18a: Rotating shaft 19: Arm plate 20: Push lever 20a: One end of push lever Part 20b: Push lever other end part 20c: Push lever convex part (engagement part)
21: Adjuster 21a: Energizing spring 22: Return air chamber 23: Air passage 23a: Check valve 24: Air passage 25: Shock relief bumper 27: Piston upper chamber 30: Drive mechanism 31: Air motor 32: Planetary gear device 33: Rotating body 34: Concave portion 35: A pair of convex portions 36: Rotating slide member 38: Sub piston 50: Immersion prevention mechanism portion 51: Feeder portion (fastener supply portion) 51a: Feed spring 51b: Feed piston chamber 51c: Feed piston 51d: Lock arm holding member 51e: Through hole (holding hole)
51f: Feeder (claw feeder) 52: Lock arm (first lock member)
52a: Lock arm one end 52b: Lock arm other end 52c: Coil spring 52d: Lock arm middle 52e: Lock arm recess (first position)
52f: Lock arm recess (second position)
53: Lock lever (second lock member) 53a: Coil spring 53c: Steel ball 53d: One end (engagement portion) of lock lever
y1: Lock lever bottom dead center (right position) y2: Lock lever top dead center

Claims (4)

A driving machine main body having a driver bit for driving the fastener and having a drive mechanism for giving the driver bit a reciprocating motion; and a nose injection hole for guiding the reciprocating motion of the driver bit and being supplied with the fastener. A nose part, a fastener supply part connected to the nose part for supplying a plurality of the fasteners to the nose injection hole, a push lever and a trigger lever for controlling activation of the drive mechanism, When the remaining amount fastener of the fastener supply unit is reduced to a predetermined amount or less, an idle driving prevention mechanism unit for locking the operation of the push lever or the trigger lever,
The idling prevention mechanism includes a first lock member and a second lock member supported by the first lock member, and the remaining amount fastener mounted in the fastener supply unit is located in the place. If the first lock member and the second lock member work together to lock the operation of the push lever or trigger lever and the push lever or trigger lever is unlocked A fastener driving machine characterized in that the lock is released by operating the second lock member.   The second lock member is supported on the first lock member so that the second lock member can be operated from the first position to the second position, and the remaining amount fastener loaded in the fastener supply section is provided. 2. The fastener driving machine according to claim 1, wherein the lock release device is configured to perform the unlocking by operating from the first position to the second position when the amount decreases below a predetermined amount. A driving machine main body having a driver bit for driving the fastener and having a drive mechanism for giving the driver bit a reciprocating motion; and a nose injection hole for guiding the reciprocating motion of the driver bit and being supplied with the fastener. A nose part, a fastener supply part connected to the nose part for supplying a plurality of the fasteners to the nose injection hole, a push lever and a trigger lever for controlling activation of the drive mechanism, When the remaining amount fastener of the fastener supply unit is reduced to a predetermined amount or less, an idle driving prevention mechanism unit for locking the operation of the push lever or the trigger lever,
A lock arm that is pressed by an elastic body in a moving direction that intersects a feeding direction of the remaining amount fastener that is loaded in the fastener supply unit, and one end of the lock arm is loaded in the fastener supply unit. A lock arm that can be moved from a first pressing position in the moving direction to a second pressing position by a pressing force of the elastic body when the remaining amount fastener is below a predetermined amount, and connected to the lock arm. And a lock lever slidably held on the lock arm in the same direction as the movement direction of the lock arm, wherein the lock lever is in the second pressing position. An idle driving prevention mechanism comprising a lock lever supported so as to be operated from the first position to the second position on the lock arm;
The idle driving prevention mechanism is configured such that when the remaining amount of fasteners loaded in the fastener supply unit becomes a predetermined amount or less, the elastic lever is used to hold the lock lever in the first position. A fastener hitting device configured to lock the operation of the push lever from the front position to the rear position or the operation of the trigger lever by moving the lock arm to the second pressing position. Embedded machine.   When the remaining amount fastener loaded in the fastener supply unit is reduced to a predetermined amount or less and the idle driving prevention mechanism operates to lock the operation of the push lever or the trigger lever, the lock lever 4. The fastener driving machine according to claim 3, wherein the lock can be released by operating from the first position to the second position. 5.

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