JP2020066117A - Driving tool - Google Patents

Abstract

To provide a driving tool that causes a driver to standby at an intermediate position, by which a contact arm can be locked by interlocking with movement of a pusher when no fastener is present.SOLUTION: A driving tool includes a driver 31 reciprocatable on an injection route formed in a nose part for launching a fastener, a magazine 12 that is coupled to the nose part and permits loading of the fastener, and a pusher 36 for pressing the fastener loaded in the magazine 12 toward a direction of the injection route. The driver 31 includes a groove 31c that permits entrance of a tip of the pusher 36.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a driving tool for driving a fastener from an injection port provided at a nose portion of a tool tip.

  In this type of driving tool, if the driving operation is performed without noticing that the nails have been used up, the driven material may be damaged or the construction may be defective. For this reason, a driving tool provided with an idle driving prevention mechanism for preventing the tool from operating when the nails are exhausted has been put into practical use.

  A mechanical type that generally locks the operation of the trigger and the contact arm when the nail is used up is generally used as the idle hit prevention mechanism (see, for example, Patent Documents 1 and 2).

  For example, in a driving tool (tacker, etc.) having a structure in which a fastener and a spring feed a fastener to an injection path, a component (idle-driving prevention arm) that interlocks with the movement of the pusher is provided, and when the pusher moves to a predetermined position, the idling prevention arm is There is a device provided with a "contact lock system" idling prevention mechanism that prevents movement of the contact arm by moving to a position that interferes with the contact arm. According to such a contact lock method, since the idling prevention mechanism can be configured with a small number of parts, the manufacturing cost of the idling prevention mechanism can be suppressed.

JP-A-8-47871 JP, 2000-343451, A

  By the way, there is such a driving tool in which a driver before driving waits at an intermediate position instead of top dead center. For example, there is a driving tool that makes the driver stand by at an intermediate position where the lower end of the driver is lower than the upper surface of the fastener when the direction of driving the fastener is downward and the opposite direction is upward. By thus making the driver stand by at the intermediate position, even if the driver is operated (lowered) due to some trouble, the fastener is not driven out, so that the safety can be secured.

  However, in order to adopt the contact lock method as described above in the driving tool for waiting the driver at the intermediate position in this way, very strict size control is required. For this reason, it was very difficult to provide a contact lock type idling prevention mechanism in the driving tool that makes the driver stand by at the intermediate position.

  That is, when the contact lock system is realized, the contact arm is arranged on the opposite side of the pusher with the injection path along which the driver slides being sandwiched. Then, when the driver is waiting in the intermediate position, the driver and the fastener are arranged between the contact arm and the pusher (idle-driving prevention arm). Assuming that there is only one fastener remaining, the pusher's forward movement is blocked by the sum of the thickness of the driver and the thickness of one fastener, and the idle driving prevention arm engages with the contact arm. It is set not to. When the contact arm is turned on and driving is performed in this state, the driver rises above the fastener to open the injection path, and the fastener is sent to the injection path. As a result, the fastener and pusher move forward by the thickness of the driver.

  At this time, since the contact arm is in the ON state (ascended), the movement of the contact arm is not restricted by the blank hitting prevention arm. Specifically, the engagement portion is moved upward from the initial position so that the engagement portion formed on the contact arm and the idle driving prevention arm do not engage with each other. In this state, the tip of the blank hitting prevention arm hits the contact arm to prevent the forward movement.

  When the pusher is prevented from advancing in this manner, the pusher cannot press the fastener, so that the fastener cannot be held sufficiently. Then, since the driver starts descending in this state, a driving failure may occur.

  The above-mentioned problem can be avoided by shortening the idling prevention arm. However, since the thickness of one fastener is almost the same as the thickness of the driver, the tip of the blank driving prevention arm does not reach the contact arm during the final fastener driving (when the driver is above the fastener). With this setting, the tip of the blank-driving prevention arm will not reach the contact arm even if the driver is waiting in the middle position without the fastener after the last fastener has been driven (even if it reaches it). Since the thickness thereof is limited to “(thickness of one fastener) − (thickness of driver)”, it is difficult to sufficiently engage the idle driving prevention arm and the contact arm). Therefore, if the idling prevention arm is shortened by giving priority to holding the fastener, it becomes difficult to achieve the original purpose of hindering the movement of the contact arm without the fastener.

  In this way, when trying to adopt the contact lock method with the driving tool that makes the driver stand by at the intermediate position, when the last one fastener is being driven (when the driver is at the top dead center), the idle driving prevention arm The dimensions must be set so that the idle-strength prevention arm and the contact arm interfere with each other when the contact arm does not come into contact and is in the state after the driving (the driver is in the intermediate position), but such setting is difficult. there were.

  In addition to the mechanical type as described above, there is also a method for detecting the presence or absence of a nail by a sensor as the idling prevention mechanism. However, with the remaining amount detection method using a sensor, when a thin nail is used, it is difficult to determine the remaining amount of the nail in units of one nail, so even if there is some detection error, blank driving does not occur. In addition, the blank driving prevention is activated with about 10 nails left.

  However, in such a machine, new nails are loaded with a small amount of nails left in the magazine, which causes the following problems. (1) Since a small amount of connecting nails easily falls in the magazine, it is difficult to load them correctly. (2) Since the remaining nails and new nails are loaded into the magazine during the blank driving prevention operation, the magazine becomes large.

  The present invention is for overcoming the above-mentioned difficulties, and in a driving tool for waiting a driver at an intermediate position, it is possible to lock the contact arm in conjunction with the movement of the pusher when the fastener is lost. An object is to provide a driving tool that can be used.

  The present invention has been made to solve the above-mentioned problems, and is a driving tool that drives a fastener from an injection port provided in a nose portion of a tool tip, and is formed in the nose portion to drive the fastener. A driver capable of reciprocating in the injection path, a magazine that is connected to the nose portion and can be loaded with fasteners, and a pusher for pressing the fastener loaded in the magazine in the direction of the injection path, The driver is provided with a groove into which the tip of the pusher can enter.

  The present invention is as described above, and the driver is formed with a groove into which the tip of the pusher can enter.

  With such a configuration, when the fastener is used up, the pusher enters the groove of the driver waiting at the intermediate position, so that the pusher can be advanced by the amount of the groove. As a result, even if the thickness of one fastener and the thickness of the driver are almost the same, the last fastener is being driven in (the driver is above the fastener and one fastener is between the pusher and the contact arm). The empty hit prevention arm and the contact arm do not come into contact with each other), and the idle hit prevention arm and the contact arm interfere after the driving (the driver is only between the pusher and the contact arm and there is no fastener). Can be set as:

  That is, the state where the final fastener is in the middle of driving (the driver is above the fastener and there is only one fastener between the pusher and the contact arm), and the state after driving (between the pusher and the contact arm). When the pusher position is compared with the case where there is only a driver and there is no fastener), the state transitions from the former to the latter, resulting in "(thickness of one fastener)-(thickness of driver) + (groove) The pusher will move forward by the amount of "depth". Therefore, even if the "thickness for one fastener" and the "thickness of the driver" are almost the same, the position of the pusher is advanced by the "depth of the groove". Then, it is possible to switch whether or not the contact is locked. Therefore, even if the dimension is not set severely, the blank driving prevention arm and the contact arm do not come into contact with each other when the last one fastener is being driven (the driver is at the top dead center), and the state after the driving (driver is Can be configured such that the idle-strength prevention arm and the contact arm interfere with each other at the intermediate position).

  Further, since the mechanism is a mechanical-type blanking prevention mechanism that does not use a sensor, it is possible to realize a blanking-prevention mechanism that operates when the consumables are completely exhausted in the magazine. Therefore, the problem (it is difficult to load correctly, the magazine becomes large) when the remaining amount detection method using the sensor is adopted does not occur.

  The groove may be formed on both sides of the driver. That is, when the fastener is U-shaped, the pusher has the pressing portions on both sides to press both legs of the U-shaped fastener, so that the pusher has the groove only at the position facing the pressing portion of the pusher. It may be formed. By limiting the position of the groove in this way, it is not necessary to thin the entire driver, and therefore the impact on driving and durability can be minimized.

  Further, the groove may not be formed at the tip portion (contact portion with the fastener) of the driver. According to this structure, the contact area between the driver and the fastener is not reduced by the groove, so that the influence on the driving can be minimized.

It is sectional drawing of the driving tool in the state where the driver is waiting by the intermediate position. It is a partial expanded sectional view near the nose part of FIG. It is a front view of a driver, (b) side view, and (c) BB line sectional view. It is (a) front view of a pusher, (b) top view, (c) side view, (d) perspective view. It is sectional drawing of a driving tool in the state where a driver exists in a top dead center. It is a partial expanded sectional view near the nose part of FIG. It is sectional drawing of the driving tool in the state where a driver exists in a bottom dead center. It is a partial expanded sectional view near the nose part of FIG. FIG. 6 is a cross-sectional view of the driving tool in a state where the driver is waiting at the intermediate position without the fastener. It is a partial expanded sectional view near the nose part of FIG. (A) A AA line sectional view of a driving tool in a state where a driver is waiting at an intermediate position with one fastener remaining, and (b) a partially enlarged view of a C1 portion. (A) A AA line sectional view of a driving tool in a state where a driver is waiting at an intermediate position without fasteners, (b) is a partially enlarged view of a C2 portion. It is a figure explaining the case where a groove does not exist in a driver, and (a) AA line sectional view of a driving tool in the state where a driver is waiting at an intermediate position with one fastener remaining, (b) It is a partially enlarged view of C3 part. It is a figure explaining the case where a groove does not exist in a driver, (a) AA line sectional view of a driving tool in the state where a driver is waiting at an intermediate position without a fastener, (b) C4 section FIG. It is a figure which shows the internal structure of a reaction absorption mechanism, Comprising: It is sectional drawing of a driving tool in the state which the driver is waiting by the intermediate position. It is a figure which shows the internal structure of a reaction absorption mechanism, Comprising: It is sectional drawing of a driving tool in the state where a driver exists in a bottom dead center.

  Embodiments of the present invention will be described with reference to the drawings. In the following description, the driving direction (downward direction shown in FIG. 1) of the fastener 60 is downward and the opposite direction (upward direction shown in FIG. 1) is upward. Further, the feeding direction of the fastener 60 (leftward in FIG. 1) will be described as the front, and the opposite direction (rightward in FIG. 1) will be described as the rear.

  The driving tool 10 according to the present embodiment is a spring-driven driving tool 10 that is driven by a spring force. In the present embodiment, the spring-driven driving tool 10 is given as an example, but the driving tool 10 is not limited to the spring-driven driving tool 10, and the driving tool 10 of another method such as a compressed air type or a gas combustion type is used. May be

  As shown in FIG. 1, the driving tool 10 according to the present embodiment includes a motor 17 inside the housing, and is driven by the motor 17 to drive the fastener 60 from the injection port provided in the nose portion 15 at the tip of the tool. It is configured to launch.

  As shown in FIG. 1, the driving tool 10 includes an output unit 11 having a drive mechanism 20 housed therein, a magazine 12 connected to the output unit 11 at a lower end side thereof so as to be orthogonal to the output unit 11, and an output unit. A grip 13 is provided on the upper end side of the motor 11 so as to be orthogonal to the output portion 11, and a motor housing portion 18 arranged along the inside of the magazine 12.

  A nose portion 15 that is pressed against the material to be driven is provided at the lower end of the output portion 11, and the leading fastener 60 loaded in the magazine 12 is supplied to the nose portion 15 by the pusher 36. The fastener 60 supplied to the nose portion 15 is driven by the driver 31 from an injection port provided at the tip of the nose portion 15.

  In addition, the nose portion 15 is provided with a contact arm 35 as a safety device. The contact arm 35 is slidably provided on the nose portion 15 and can be pressed against the material to be driven. The contact arm 35 is provided so as to protrude from the tip of the nose portion 15, and is constantly urged by the arm urging member 39 in the protruding direction. When the worker performs the driving operation, the contact arm 35 is pressed against the material to be driven and slid, so that the contact arm 35 is turned on, and the operation of the operation unit 14 becomes effective electrically or mechanically. Is configured to be. In other words, the driving operation is not performed when the contact arm 35 is not sliding (OFF state).

  Inside the nose portion 15, as shown in FIG. 2, an injection path 15a for guiding the fastener 60 to the injection port is formed. The exit of the injection path 15a serves as an exit.

  Inside the output unit 11, a driver 31 that can reciprocate in the injection path 15a to drive the fastener 60, a plunger 32 to which the driver 31 is connected, and a plunger urging member 33 that urges the plunger 32 toward the injection port. A drive mechanism 20 for operating the plunger 32, a brake switch 41 for detecting the position of the plunger 32, and the like are arranged.

  As shown in FIG. 3, the driver 31 according to the present embodiment is a plate for hitting the fastener 60. The driver 31 has a plunger connecting portion 31a on the upper end side for integrally connecting with the plunger 32, and a straight portion 31b for sliding in the injection path 15a on the lower end side. The driver 31 is connected to the plunger 32 via the plunger connecting portion 31a and slides integrally with the plunger 32. That is, when the plunger 32 is actuated by the urging force of the plunger urging member 33, the plunger 32 slides toward the injection port, and thereby the fastener 60 in the injection path 15a is driven at the tip of the straight portion 31b. .

  The plunger 32 is vertically slidably guided by a guide member, and is constantly urged toward the injection port by a plunger urging member 33 composed of a compression spring.

  The plunger 32 is arranged adjacent to the drive mechanism 20 described later and has an engaged portion on the surface facing the drive mechanism 20.

  The drive mechanism 20 is a mechanism that pushes up the plunger 32 against the urging force of the plunger urging member 33. The drive mechanism 20 moves the plunger 32 using the motor 17 as a power source to accumulate the urging force in the plunger urging member 33, and instantaneously releases the urging force to slide the plunger 32 momentarily. It is designed to execute the driving operation.

  For example, the drive mechanism 20 includes a gear that is rotated by the driving force of the motor 17. An engaging portion that can engage with the engaged portion of the plunger 32 is formed on the side surface of the gear. The drive mechanism 20 rotates the gear while the plunger 32 is engaged with the gear, and thereby pushes the plunger 32 upward. Then, the engagement between the gear and the plunger 32 is released at the timing when the plunger 32 (driver 31) moves to the top dead center. When the engagement between the gear and the plunger 32 is released, the plunger 32 moves downward due to the urging force of the plunger urging member 33, so that the driver 31 connected to the plunger 32 slides in the direction of the injection port. The fastener 60 is set out.

  As shown in FIG. 5, the brake switch 41 is arranged at a position where it is pushed down by the plunger 32 when the plunger 32 reaches the top dead center position. When the brake switch 41 is pressed, a brake signal is output to the control device. The control device controls to stop the driving of the motor 17 by using this brake signal as a trigger.

  The magazine 12 is for loading the fastener 60 that is driven by the driver 31 described above. The magazine 12 is connected behind the nose portion 15. In the tool according to the present embodiment, the magazine 12 is loaded with connecting fasteners in which a plurality of fasteners 60 are arranged and connected. The fastener 60 according to this embodiment is a U-shaped staple.

  Further, as shown in FIG. 2 and the like, inside the magazine 12, there is provided a pusher 36 for pressing the fastener 60 loaded in the magazine 12 toward the ejection path 15a. The pusher 36 is a member having a U-shaped cross section as shown in FIG. 4, and is provided with pressing portions 36a for pressing both legs of the fastener 60 (staple) on both sides. The pressing portions 36a are formed in parallel with each other, and the tips 36b of the pressing portions 36a press the both leg portions of the fastener 60 forward. The pusher 36 is always urged forward by a pusher urging member 38. Therefore, the fastener 60 loaded in the magazine 12 is always pressed forward by the pusher 36.

  The grip 13 is a part to be gripped by an operator who uses the driving tool 10. The grip 13 is formed in a rod shape so that an operator can easily hold it. Further, an operation portion 14 that can be pulled by the index finger is provided at a position where the index finger of the operator is applied when the operator grips the grip 13. When the operation unit 14 is operated, the trigger switch 40 arranged inside the grip 13 is turned on, and an operation signal is output to the control device. The control device performs control to start driving the motor 17 by using this operation signal as a trigger.

  A battery mounting portion 13a for mounting the battery 55 is formed at the rear end portion (the end portion on the side opposite to the output portion 11) of the grip 13. The driving tool 10 according to the present embodiment is adapted to be driven by the electric power supplied from the battery 55 mounted on the battery mounting portion 13a. The battery 55 has a built-in secondary battery and can be charged by removing it from the driving tool 10. A board 50 on which components such as a CPU and a RAM are mounted is arranged inside the battery mounting portion 13a. The CPU and the RAM mounted on the board 50 constitute a control device for controlling the operation of the driving tool 10.

  The motor housing portion 18 is a portion for housing the motor 17. The motor housing portion 18 according to the present embodiment is arranged on the grip 13 side of the magazine 12 so as to face the grip 13.

  The operation of the driving tool 10 as described above is controlled by the control device. The control device is mainly composed of a CPU and includes a ROM, a RAM, an I / O and the like. Then, the CPU reads the program stored in the ROM to control various input devices and output devices.

  For example, the control device controls to drive the motor 17 when the operation unit 14 is operated, and controls to stop the motor 17 when the state of the brake switch 41 changes.

  Specifically, in the standby state shown in FIG. 1, when the contact arm 35 is turned on and the trigger switch 40 is turned on, the driving is started. That is, the drive of the motor 17 is started by the control device. When the motor 17 rotates, the drive mechanism 20 operates to gradually lift the plunger 32 upward.

  Then, as shown in FIG. 5, when the plunger 32 moves to the top dead center position, the plunger 32 presses the brake switch 41. Immediately after that, the engagement between the drive mechanism 20 and the plunger 32 is released, and the plunger 32 and the driver 31 are momentarily moved toward the injection port by the urging force accumulated in the plunger urging member 33. As a result, as shown in FIG. 7, the fastener 32 is driven by moving the plunger 32 to the bottom dead center position.

  After that, when the motor 17 rotates until it returns to the standby state shown in FIG. 9, the control device stops the motor 17. At this time, the timing at which the motor 17 is stopped can be measured by measuring a predetermined time after the brake switch 41 is turned on again after being turned on in the state shown in FIG. For example, the control device measures 0.5 seconds after the brake switch 41 is turned off, and stops the motor 17 after 0.5 seconds. In this way, by stopping the motor 17 after a predetermined time has elapsed since the brake switch 41 was turned off (after the fastener 60 has been driven in), the intermediate position where the predetermined biasing force is accumulated in the plunger biasing member 33. The plunger 32 can be moved to and stopped. As described above, in the present embodiment, the driver 31 before driving waits at an intermediate position between the top dead center and the bottom dead center. This intermediate position is a position where the lower end of the driver 31 is below the upper surface of the fastener 60 (see FIG. 2). By keeping the driver 31 on standby at such an intermediate position, the fastener 60 is not driven even if the driver 31 is operated (lowered) due to some trouble, so that safety can be ensured.

  Here, the driving tool 10 according to the present embodiment includes an idle driving prevention mechanism for preventing the tool from operating when the fastener 60 is gone. Specifically, the contact arm is provided with a blank hitting prevention arm 37 that interlocks with the movement of the pusher 36, and when the pusher 36 moves to a predetermined position, the blank hitting prevention arm 37 moves to a position where it interferes with the contact arm 35. The movement of 35 is blocked.

  As shown in FIG. 4, the blank-driving prevention arm 37 is fixed to the pusher 36 so as to project in the direction of the injection path 15a (in front of the pusher 36). The blank hitting prevention arm 37 is adapted to move in the direction of the injection path 15a in conjunction with the pusher 36. For example, as shown in FIG. 2, when the fastener 60 is running low and the pusher 36 moves forward, the blank hitting prevention arm 37 penetrates the through hole 15b formed in the nose portion 15 and comes into contact with the contact arm 35. You can enter as much as you can.

  In addition, as shown in FIG. 2, the contact arm 35 is formed with an arm engagement portion 35 a for engaging with the idle driving prevention arm 37. The arm engaging portion 35a is a hole into which the tip of the blank driving prevention arm 37 can be inserted, and is formed at a position on the extension line of the blank driving prevention arm 37 when the contact arm 35 is in the off state. Therefore, when the fastener 60 disappears, as shown in FIG. 10, the idle hitting prevention arm 37 and the arm engaging portion 35a engage with each other on the side opposite to the pusher 36 as viewed from the injection path 15a. . The contact arm 35 is locked so that it cannot slide when the blank hitting prevention arm 37 engages with the arm engaging portion 35a.

  Further, as shown in FIG. 3, the straight portion 31b of the driver 31 has grooves 31c formed on both sides thereof. Since the grooves 31c are formed on both sides, the cross section of the straight portion 31b has a hat shape as shown in FIG. 3C, and the protruding portions 31d are formed between the grooves 31c. As shown in FIG. 11B, the groove 31c is formed so as to face the tip 36b of the pressing portion 36a of the pusher 36. By providing the groove 31c, it is possible to employ the contact lock type idle driving prevention mechanism even in the driving tool 10 that makes the driver 31 stand by at the intermediate position.

  That is, as shown in FIG. 2 and FIG. 11, in the state where there is only one fastener 60 remaining, the driver 31 and one fastener 60 are pressed against the wall in front of the injection path 15a by the pusher 36. . At the position of the pusher 36 at this time, the idle-driving prevention arm 37 is set so as not to reach the contact arm 35 (the idle-driving prevention arm 37 does not engage the arm engaging portion 35a and does not lock the contact arm 35). There is.

  When the driving is started in this state, the driver 31 first moves to the top dead center position as shown in FIG. As a result, the driver 31 moves above the fastener 60, and the remaining one fastener 60 is sent to the empty injection path 15a. As a result, the fastener 60 and the pusher 36 move forward by the thickness of the driver 31. At the position of the pusher 36 at this time, the idle-driving prevention arm 37 is set so as not to reach the contact arm 35 (the idle-driving prevention arm 37 does not engage the arm engaging portion 35a and does not lock the contact arm 35). There is.

  After that, the driver 31 descends from the top dead center position and moves to the bottom dead center position as shown in FIG. As a result, the fastener 60 is driven. Thereafter, as shown in FIG. 10, the motor 17 operates until the driver 31 reaches the intermediate position, and when the driver 31 reaches the intermediate position, the motor 17 stops. As a result, the driver 31 returns to the initial state of waiting at the intermediate position.

  At this time, as shown in FIG. 12, since there is no fastener 60 in the magazine 12, the pusher 36 advances to the position where it comes into contact with the driver 31. Since the groove 31c is formed in the driver 31 at a position facing the tip 36b of the pusher 36, the tip 36b of the pusher 36 enters the groove 31c. Therefore, the last fastener 60 shown in FIG. 6 is in the middle of driving (the state where there is only one fastener 60 between the pusher 36 and the contact arm 35 and there is no driver 31), and the state after the driving shown in FIG. When the position of the pusher 36 is compared with the state (the state where only the driver 31 is present between the pusher 36 and the contact arm 35 and the fastener 60 is not present), the state transitions from the former to the latter. The pusher 36 is moved forward by the amount of (Sa) − (thickness of driver 31) + (depth of groove 31c) ”. According to such a mode, even if the "thickness of the fastener 60" and the "thickness of the driver 31" are almost the same, the "depth of the groove 31c" can be calculated during and after the driving of the fastener 60. Only the pusher 36 moves forward. As the pusher 36 moves forward in this way, the idle-driving prevention arm 37 engages with the arm engaging portion 35a and locks the contact arm 35.

  As described above, if the position of the pusher 36 that moves by the amount of the groove 31c is used to switch whether to perform contact locking or not, the last one fastener 60 can be installed without severe dimension setting. The idle-driving prevention arm 37 and the contact arm 35 do not come into contact with each other during the driving (the driver 31 is at the top dead center), and the idle-driving prevention arm 37 and the contact arm 35 do not contact each other after the driving (the driver 31 is at the intermediate position). It can be configured to interfere.

  If the driver 31 does not have the groove 31c, as shown in FIG. 13, the blank driving prevention arm 37 does not reach the contact arm 35 (the blank driving prevention arm 37 is an arm when the fastener 60 remains one). It is possible to set so as not to engage the engaging portion 35a and not lock the contact arm 35).

  However, as shown in FIG. 14, after the driving is completed, the pusher 36 cannot be advanced sufficiently and the contact arm 35 cannot be locked. The contact arm 35 can be locked by lengthening the blank-driving prevention arm 37. In this case, however, the blank-driving prevention arm 37 can be locked even when the fastener 60 is provided instead of the driver 31 shown in FIG. Since it interferes with the contact arm 35, the pusher 36 is prevented from moving forward. If the pusher 36 is prevented from advancing, the fastener 60 may not be sufficiently pressed and held, resulting in defective driving.

  As described above, when the driver 31 does not have the groove 31c, the contact arm 35 may be insufficiently locked or the fastener 60 may not be sufficiently pressed and held. In this respect, according to the present embodiment, such a problem can be avoided by adjusting the depth of the groove 31c.

  By the way, the driving tool 10 in the present embodiment is provided with a reaction absorbing mechanism for absorbing a reaction in the driving operation of the fastener 60.

  As shown in FIG. 15, the reaction absorbing mechanism includes a balancer 45 slidably provided in the pipe 44, and a balancer urging member 46 for urging the balancer 45 in a direction opposite to the driving direction of the fastener 60. It is configured with.

  The balancer 45 is a cylindrical metal member that is formed along the inner diameter of the pipe 44 that guides the sliding of the plunger 32, and is slidable inside the pipe 44. Since the pipe 44 is arranged parallel to the driving direction of the fastener 60, the balancer 45 sliding inside the pipe 44 is formed so as to slide parallel to the driver 31.

  The balancer biasing member 46 is a compression spring arranged inside the pipe 44. The balancer urging member 46 is arranged closer to the emission port than the balancer 45 and urges the balancer 45 in a direction away from the emission port.

  The balancer 45 is connected to the plunger 32 via a wire 47, which is a cord-shaped member, and is adapted to move in conjunction with the movement of the plunger 32. Specifically, since the direction of the force applied to the wire 47 is changed by about 180 degrees by the pulley 48, when the driver 31 slides upward due to the plunger 32 being pushed up by the drive mechanism 20, the balancer 45 moves. It is pulled by the wire 47 and moves downward. At this time, the balancer urging member 46 is compressed, and the urging force is stored in the spring.

  Then, as shown in FIG. 16, when the driver 32 moves to the bottom dead center and the fastener 60 is driven by the plunger 32 being released from the drive mechanism 20, the pulling by the wire 47 is released. Therefore, the balancer 45 moves upward by the urging force of the balancer urging member 46. By moving the balancer 45 in this way, the reaction at the time of driving is absorbed.

  A rubber balancer stop 49 for receiving the balancer 45 moved upward is provided near the upper end of the pipe 44.

  However, in the present embodiment, the free length of the balancer biasing member 46 is set to be short so that the balancer 45 does not hit the balancer stop 49 when the balancer biasing member 46 is in the natural state. Therefore, as shown in FIG. 16, the urging force by the balancer urging member 46 does not act before the collision with the balancer stop 49. Therefore, even if the balancer 45 hits the balancer stop 49, the balancer 45 moving by inertia only hits the balancer stop 49. With such a setting, the impact caused by the balancer 45 colliding with the balancer stop 49 can be reduced.

  The reaction absorbing mechanism according to the present embodiment cancels the reaction due to driving by the balancer 45 moving in the direction opposite to the plunger 32, and therefore the balancer 45 does not necessarily have to be pressed against the balancer stop 49. . Even if the balancer 45 does not hit the balancer stop 49, the reaction absorption effect can be obtained.

  As described above, the reaction absorption mechanism according to the present embodiment includes the balancer 45 that moves in a direction away from the ejection port by the urging force of the balancer urging member 46 when the driver 31 slides in the ejection port direction. . Therefore, at the time of driving, a force is applied to the driving tool 10 in a direction away from the material to be driven, but at the same time, the reaction force of the balancer urging member 46 to urge the balancer 45 causes the driving tool 10 to move toward the material to be driven. A force that pushes in the direction is added. That is, the “force applied in the direction away from the material to be driven” and the “force applied in the direction of the material to be driven” are offset, so that the reaction received during the driving can be absorbed. With such an action, a sufficient pressing force can be obtained with a small pressing force against the material to be driven, so that the fatigue of the operator is reduced. Further, the problem that the driver 31 is disengaged from the fastener 60 due to the recoil and the material to be driven is damaged is unlikely to occur.

  Further, since the urging force of the balancer urging member 46 is set so that the balancer 45 and the balancer stop 49 do not come into contact with each other in the stationary state after the completion of driving, the impact by the balancer 45 can be reduced.

  By the way, when the balancer 45 is set to be pressed against the balancer stop 49 in a natural state, the impact applied to the balancer stop 49 during a collision is large and the machine body is lifted up (the machine body is separated from the driven material). ) Occurs, the feel of impact deteriorates. However, by setting to reduce the impact by the balancer 45 as described above, the feel of impact is not impaired. Further, by reducing the impact of the balancer 45, it is possible to prevent damage to the machine body and the balancer biasing member 46.

  The balancer urging member 46 of the present embodiment has an end portion formed in an open end in addition to the setting of the urging force so that the balancer 45 and the balancer stop 49 do not come into contact with each other. By doing so, it is possible to prevent the balancer urging member 46 from being damaged by the impact caused by the collision between the balancer 45 and the balancer stop 49.

  As described above, according to the present embodiment, the driver 31 is formed with the groove 31c so as to face the tip 36b of the pusher 36, and the pusher 36 has an idle shot protruding in the direction of the injection path 15a. The prevention arm 37 is provided, and the contact arm 35 is formed with an arm engagement portion 35a that engages with the idle-driving prevention arm 37 on the side opposite to the pusher 36 when viewed from the injection path 15a. The contact arm 35 is configured to be locked so that the contact arm 35 cannot slide by engaging the arm 37 with the arm engaging portion 35a. The tip end 36b of the pusher 36 enters the groove 31c of the driver 31 when the driver 31 is on standby in the ejection path 15a and the fastener 60 is not loaded in the magazine 12.

  With such a configuration, when the fastener 60 is used up, the pusher 36 enters the groove 31c of the driver 31 waiting at the intermediate position, so that the pusher 36 can be advanced by the amount of the groove 31c. As a result, even when the thickness of one fastener 60 and the thickness of the driver 31 are substantially the same, the final fastener 60 is in the middle of driving (the driver 31 is above the fastener 60, and the pusher 36 and the contact arm 35). In the state where there is only one fastener 60 between and, the blank driving prevention arm 37 and the contact arm 35 do not come into contact with each other, and there is only the driver 31 between the driving (the pusher 36 and the contact arm 35). It can be set so that the blank hitting prevention arm 37 and the contact arm 35 interfere with each other.

  Further, in the present embodiment, the grooves 31c are formed on both sides of the driver 31. That is, since the fastener 60 is U-shaped, the pusher 36 has the pressing portions 36a on both sides for pressing both legs of the U-shaped fastener 60, and the pusher 36 is located at a position facing the pressing portion 36a of the pusher 36. Only the groove 31c is formed. By limiting the position of the groove 31c in this way, it is not necessary to thin the driver 31 as a whole, so that the impact on the driving performance and durability of the driver 31 can be minimized.

  Further, the groove 31c may not be formed in the tip portion (contact portion with the fastener 60) of the driver 31. According to this structure, the contact area between the driver 31 and the fastener 60 is not reduced by the groove 31c, so that the influence on the driving performance of the driver 31 can be minimized.

  In addition, in the above-mentioned embodiment, the example in which the blank driving prevention arm 37 is fixed to the pusher 36 has been described, but the embodiment of the present invention is not limited to this. That is, the blank-driving prevention arm 37 may move forward in conjunction with the pusher 36, and may be formed as a separate member from the pusher 36.

  In the above-described embodiment, the driving tool 10 in which the driver 31 intentionally stands by at the intermediate position has been described as an example, but the embodiment of the present invention is not limited to this. That is, even with the driving tool 10 whose standby position is not the intermediate position, an incomplete return may occur due to some malfunction and the driver 31 may stop at the intermediate position. The present invention may be applied to such a driving tool 10.

10 Driving Tool 11 Output Section 12 Magazine 13 Grip 13a Battery Mounting Section 14 Operation Section 15 Nose Section 15a Injection Path 15b Through Hole 17 Motor 18 Motor Housing Section 20 Drive Mechanism 31 Driver 31a Plunger Connecting Section 31b Straight Section 31c Groove 31d Convex Section 32 Plunger 33 Plunger urging member 35 Contact arm 35a Arm engaging part 36 Pusher 36a Pressing part 36b Tip 37 Blank hit prevention arm 38 Pusher urging member 39 Arm urging member 40 Trigger switch 41 Brake switch 44 Pipe 45 Balancer 46 Balancer urging Member 47 Wire 48 Pulley 49 Balancer stop 50 Board 55 Battery 60 Fastener

Claims (6)

It is a driving tool that drives fasteners from an injection port provided in the nose part of the tool tip,
A driver capable of reciprocating the injection path formed in the nose portion to drive the fastener,
A magazine that is connected to the nose part and can be loaded with fasteners,
A pusher for pressing the fastener loaded in the magazine in the direction of the injection path,
Equipped with
The driving tool is characterized in that a groove into which the tip of the pusher can enter is formed in the driver. A contact arm slidably provided with respect to the nose portion and capable of being pressed against a material to be driven;
A blank hitting prevention arm that moves in the direction of the injection path in conjunction with the pusher,
Equipped with
The contact arm is formed with an arm engaging portion that engages with the idle-driving prevention arm,
3. The contact arm is locked so as not to slide when the blank hitting prevention arm engages with the arm engaging portion when the fastener is not loaded in the magazine. The described driving tool.   The driving tool according to claim 2, wherein the blank-driving prevention arm moves to a position where it can be engaged with the arm engagement portion when the tip of the pusher enters the groove.   The driving tool according to claim 1, wherein the groove is formed on both sides of the driver.   The driving tool according to any one of claims 1 to 4, wherein the groove is not formed at a tip portion of the driver. It is a driving tool that drives fasteners from an injection port provided in the nose part of the tool tip,
A driver capable of reciprocating the injection path formed in the nose portion to drive the fastener,
A magazine that is connected to the nose part and can be loaded with fasteners,
Equipped with
The driving tool is characterized in that the driver has a T-shaped cross section by forming a convex portion in the direction of the magazine.

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