JP4082356B2 - Nailer starter - Google Patents

Description

  The present invention includes a trigger lever that is operated by a finger holding a nail driver and a contact arm that is operated by pressing a nose portion that forms an injection port for driving out a nail against a material to be driven. The present invention relates to a starter for a nail driver that activates a start valve by cooperation to start a nail driver and drives a nail supplied to a nose portion into a material to be driven.

  The piston is shockedly driven in the cylinder using compressed air as a power source, and the driver coupled to the piston is slidably guided in the injection port formed in the nose portion, and the nail supplied in the injection port is There is known a nailing machine that is struck by a driver and driven into a workpiece. In such a nailing machine, the pulling operation of the trigger lever formed at the base of the grip part that holds the nailing machine, and the contact arm arranged to protrude from the tip of the nose part to the driven material The nailing machine is activated by two operations of pressing, the piston is driven by compressed air introduced into the cylinder, and the nail is driven by a driver connected to the piston.

  The nail driving method for such a nailing machine is that the trigger lever is first rotated and then the nose of the nailing machine is pressed against the material to be driven to slide the contact arm to nail. Continuous driving mode for starting the machine, and positioning the nose part of the nailing machine at the place to be driven, sliding the contact arm, and then turning the trigger lever to start the nailing machine And single shot mode. In the continuous driving mode, every time the nose portion of the nailing machine is struck against the material to be driven while the trigger lever is pulled, the nailing machine is continuously started to drive the nail continuously. Also, in the single shot mode, the nailing machine is surely driven to a predetermined driving position, and the nailing machine is moved up by the reaction, so that the nose is pressed against the driven material again and the contact arm is operated. So that double strikes and the like do not occur.

As a conventional nailing machine starting device, there is one which can automatically switch between the continuous driving mode and the single shot mode with the same nailing machine so that the nailing operation in each mode can be performed. This conventional nailing machine is provided with a switching operation member so as to move up and down integrally with the contact arm, and in the single shot mode in which the trigger lever is rotated after the contact arm is slid, the switching operation is performed by the trigger lever. Holding the member and the contact arm in the upper position, and engaging the switching operation member or the contact arm and the contact lever, which are held above, to hold the valve stem of the start valve in the ON operation state; The holding of the switching operation member is canceled by opening the trigger lever so that the valve stem of the start valve can be operated to the off position.
Japanese Patent No. 2727960

  In the conventional nailing machine described above, the trigger lever is pulled in the single shot mode in which the nose is pressed against the surface of the workpiece and the contact arm is operated to operate the trigger lever to drive the nailing machine. When the valve stem is activated and the start valve is turned on and the nail driver is activated, the nail driver is moved up by the reaction and the nose part is separated from the surface of the workpiece. When the contact arm is returned and then the nail driver is lowered and the contact arm is operated again, a dribbling phenomenon may occur in which the nail is driven again. To prevent such a dribbling phenomenon, the starting valve is turned on at a position near the top dead center of the valve stem operating stroke, and the starting valve is turned off at a position near the bottom dead center of the valve stem operating stroke. The position where the trigger valve of the start valve is operated upward to turn on the start valve and the position where the trigger stem of the start valve in the on state moves downward to turn off the start valve are set so that they are activated. ing. In the nailing machine provided with the conventional switching operation member, the lower position of the valve stem of the starting valve is regulated by the switching operation member so that the valve stem is maintained in the on state, and the trigger lever is pulled. As long as the contact arm is operated up and down, the start valve is not turned off, and the nail driver is not restarted even if the contact arm is operated again.

  By the way, when nailing continuously in the continuous driving mode, the nailing machine is swung down toward the driven material while pulling the trigger lever, and the nose portion is hit against the surface of the driven material. The contact arm is actuated by the operation, the starting valve is turned on in the middle of swinging down, the nailing machine is started, and the nail is driven. By driving the nailing machine while swinging down in this manner, the reaction generated when the nailing machine is driven is absorbed to facilitate the continuous nailing operation. As described above, when the start valve is set to be turned on near the top dead center of the valve stem operation stroke, the start valve is turned on at the end of the contact arm operation stroke. As a result, the nailing machine is driven after the nose part of the nailing machine that has been swung down has landed on the material to be driven, and the reaction cannot be absorbed. It may occur and the nailing machine will be greatly separated from the surface of the material to be driven, which may impair workability.

  To reduce the reaction of the nailing machine in the continuous driving mode, it is necessary to turn on the start valve at an early timing of the contact arm stroke. To turn on the start valve at an early timing, the valve stem must be turned on. It is necessary to set the position in the downward direction of the stroke, and if the valve stem ON position is set close to the bottom dead center side, the shift amount of the valve stem ON position and OFF position becomes small, and as described above, single stroke When the nailing machine is moved up by reaction, the contact arm is returned, and at this time, the valve stem is lowered to the off position, the starting valve is turned off, and the contact arm is operated again. If the dribbling occurs again or the air is not supplied to the nailer, Since the valve stem of the start valve may be placed above the ON position by the switching operation member while the single lever mode is maintained by pulling the trigger lever after operating the When connected, the start valve may be turned on, causing the nailer to malfunction.

  The present invention solves the above-mentioned problems in the prior art, and can switch between continuous and single shot modes automatically according to the operation order of the two members, the trigger lever and the contact arm, and the nail in the continuous shot mode. A nailing machine starter that can reduce the recoil of the hammer and prevent dribbling in the single shot mode and malfunction when the air chuck is connected while maintaining the single shot mode. The issue is to provide.

In order to solve the above-mentioned problems, a starting device for a nailing machine according to the present invention includes a striking mechanism that impactively drives a driver that strikes a nail, and a guide that slidably guides the driver to the tip while accommodating the striking mechanism. And a start valve that operates to supply compressed air to the striking mechanism to drive the driver and exhaust the compressed air that has driven the driver to return the striking mechanism to the initial position. And an activation device composed of a trigger lever operated by a finger holding the housing and a contact arm operated by bringing the nose portion into contact with the driven material, the activation device In the nailing machine in which the activation valve is operated by the activation device, the activation device is further engaged with the operation end of the contact lever. A support lever that is rotatably provided at the tip of the contact arm and a support lever so as to release the engagement between the support lever and the contact lever in cooperation with an engagement piece formed on the trigger lever. An operation lever that rotates the trigger lever, and the trigger lever rotates in the continuous driving mode in which a nail is driven every time the nose portion is brought into contact with the driven material while the trigger lever is rotated. It actuates the proximal end portion of the contact lever upward by operating the valve by a support lever for moving operation upward in conjunction with the contact arm into engagement with the operating end of the contact lever actuates the operating end upward together so as to turn on actuating stem, the single-handed mode to operate the trigger lever following the contact arm, trigger By engaging the engagement lever of the trigger lever below the operation lever by rotating the bar and engaging the operation lever operating downward with the contact arm by the reaction of the nail driver The support lever is rotated via the operation lever to release the engagement between the support lever and the contact lever.

  The starter of the nail driver according to the present invention is provided with a pivotable support lever at the front end of the contact arm that engages with the operation end side of the contact lever to support the operation end side, and is further rotated. An operation lever for rotating the support lever so as to release the engagement between the support lever and the contact lever when the contact arm is moved downward by the reaction in cooperation with the engagement piece formed on The support lever operated upward by the contact arm is engaged with the operation end of the contact lever so that the operation end side of the contact lever is rotated upward. It is possible to set the tip to a high position, and it is possible to turn on the start valve at the early timing of the contact arm operation stroke Ri, the nailing machine can be launched nailing machine in the middle of the down swing operation to the struck member, it is possible to reduce the reaction caused by the driving of the nailing machine, it is possible to perform comfortably continuous beating work.

  In the single shot mode, the trigger lever operated after the contact arm is rotated to place the engagement piece formed on the trigger lever below the control lever so that the nailing machine moves up by the reaction of the nail driving. When the contact arm is operated downward, the support lever is rotated so that the engagement between the support lever and the contact arm is released via the operation lever by engaging the operation lever with the engagement piece. In this way, the operation end of the contact lever is rotated to a position where it can be retracted from the contact arm operating locus. Even if it is operated, the contact lever is not rotated by this operation, so that it is possible to prevent dribbling due to the reaction of the nailer.

  Furthermore, even if the nose is pressed against the workpiece and the contact arm is operated and the trigger lever is pulled, the nose is moved away from the workpiece and the contact arm is not operated. In this state, the contact lever is operated to the valve stem to the off position and the starting valve is maintained in the off operation state. Even when the nailing machine is connected to the air supply source in this state, the nailing machine is activated. There will be no malfunction and no malfunction will occur when air is connected.

  According to the present invention, the switching setting between the continuous driving mode and the single shot mode can be automatically performed by selecting the operation order of the two members of the trigger lever and the contact arm, and the nail driving at the time of continuous driving in the continuous driving mode. The starter of the nailer is capable of reducing the recoil of the machine and preventing the occurrence of dribbling in the single shot mode and the malfunction when the air chuck is connected while holding the single shot mode. Is supported in cooperation with an engagement piece formed on the trigger lever and a support lever rotatably provided at the tip of the contact arm so as to be engaged with and supported by the operation end side of the contact lever. This is realized by comprising an operation lever that rotates the support lever so as to release the engagement between the lever and the contact lever. Describing Do the following examples.

  As shown in FIG. 1, the nail driver 1 slides the piston 4 and a piston 4 in which a driver 3 for striking a nail is coupled to a lower surface inside a housing 2 in which a grip portion 8 is integrally formed facing rearward. A striking mechanism constituted by a freely accommodated cylinder 5 is accommodated, and an injection port 6 for slidingly guiding the driver 3 coupled to the piston 4 is formed at the tip of the housing 2. A nose portion 7 is attached. An air chamber 10 for storing compressed air supplied from a compressed air source through an air plug 9 attached to the rear end of the grip portion 8 is formed inside the grip portion 8 formed in the housing 2. The piston 4 is shockedly driven by supplying the compressed air in the air chamber 10 into the cylinder 5, and the nail supplied into the injection port 6 is driven by the driver 3 toward the tip of the nose portion 7. I am trying to shoot out.

  Above the cylinder 5 in the housing 2, the compressed air in the air chamber 10 is supplied into the cylinder 5 to drive the piston 4, and the compressed air after the piston 4 is driven is supplied from the cylinder 5. An annular main valve 11 is provided for discharging the air to the atmosphere to return the piston 4 to return. The main valve 11 is arranged in such a manner that the upper end portion of the main valve 11 is accommodated in an annular chamber 13 formed in an upper housing 12 disposed on the upper portion of the housing 2, and is compressed into the annular chamber 13. When the air is supplied, the main valve 11 is actuated downward to shut off the inside of the cylinder 5 from the air chamber 10 and to connect the cylinder 5 to the atmosphere, and the compressed air in the annular chamber 13 is The main valve 11 is actuated upward by the compressed air in the air chamber 10 acting on the lower end of the main valve 11 by being exhausted to the atmosphere, and the cylinder 5 is shut off from the atmosphere and connected to the air chamber 10. Operated to let you.

  Further, at the base of the grip portion 8, an activation valve 15 for controlling the compressed air in the annular chamber 13 in which the main valve 11 is accommodated to operate the main valve 11 to activate the nailing machine 1 is provided. ing. As shown in FIG. 2, the starting valve 15 includes a hollow pilot valve 18 that is slidably accommodated in a valve housing 16 in which a piston portion at a lower end is formed in a cylinder shape, and an upper end portion that is the pilot valve. It is comprised by the valve stem 19 arrange | positioned so that a lower end may protrude from the said valve housing 16, and it accommodates in the hollow part of 18. As shown in FIG. A valve body that operates to selectively connect an air passage 17 communicating with the annular chamber 13 between the air chamber 10 and the exhaust chamber 14 is formed integrally with the upper portion of the pilot valve 18. The valve stem 19 blocks or communicates with the atmosphere in the valve chamber 20 formed below the piston portion of the pilot valve 18 in the valve housing 16 and cooperates with the pilot valve 18. And act to control the flow or blockage of compressed air into the valve chamber 20.

  As shown in FIG. 3A, the valve stem 19 is fitted in a hollow portion of the pilot valve 18 and a first O-ring 22 fitted in a cylindrical portion 21 formed in the valve housing 16. And a second O-ring 23 to be joined, and as shown in FIG. 3A, the first O-ring 22 is attached to the valve housing 16 before the operation in which the valve stem 19 is disposed at the bottom dead center. An exhaust port 26 that is fitted in the cylindrical portion 21 and communicates between the valve chamber 20 and the atmosphere is blocked. Compressed air in the air chamber 10 is supplied into the valve chamber 20 through an opening 24 formed in the peripheral wall surface of the pilot valve 18, and the pilot valve 18 is moved upward by the pressure of the compressed air. The upper end of the pilot valve 18 is brought into close contact with the exhaust valve seat 25 to shut off the air passage 17 from the exhaust chamber 14 and connect the air passage 17 to the air chamber 10 to supply compressed air to the annular chamber 13 of the main valve. The cylinder 5 and the air chamber 10 are operated so as to be disconnected.

  When the valve stem 19 is operated upward from the bottom dead center position and the valve stem 19 is operated from the bottom dead center position to the ON position of the dimension A as shown in FIG. One O-ring 22 is withdrawn from the cylindrical portion 21 of the valve housing 16, and the compressed air in the valve chamber 20 is exhausted from the exhaust port 26 to reduce the pressure in the valve chamber 20. The compressed air in 10 is actuated downward by acting on the upper surface side of the piston portion, and a third O-ring 27 disposed at the upper part of the pilot valve 18 is formed at the upper end of the annular sleeve 28. The air valve seat 29 is fitted to disconnect the air passage 17 and the air chamber 10, and the upper end of the pilot valve 18 is separated from the exhaust valve seat 25, so that the air passage 17. Communicated to the exhaust chamber 14 the compressed air in the annular chamber 13 is evacuated to the atmosphere. As a result, the main valve 11 is actuated upward so that the inside of the cylinder 5 communicates with the air chamber 10 and compressed air in the air chamber 10 is supplied into the cylinder 5.

  When the compressed air in the valve chamber 20 of the start valve 15 is exhausted and the pilot valve 18 is operated downward and the start valve 15 is turned on, the second O-ring 23 of the valve stem 19 is inserted into the hollow portion of the pilot valve 18. Are fitted to block the compressed air supplied into the valve chamber 20 through the opening 24. When the valve stem 19 is operated downward after the start valve 15 is turned on, the first O-ring 22 of the valve stem 19 is fitted into the cylindrical portion 21 of the valve housing 16 to shut off the valve housing 16 from the atmosphere. However, at this time, since the second O-ring 23 is fitted into the hollow of the pilot valve 18 as described above and the flow of compressed air into the valve chamber 20 is blocked, the start valve 15 is turned on. Is maintained. As shown in FIG. 3C, when the valve stem 19 is actuated from the bottom dead center to the OFF position of dimension B, the second O-ring 23 of the valve stem 19 is pulled out from the hollow portion of the pilot valve 18, and the valve Compressed air is supplied into the chamber 20 through the opening 24, and the pilot valve 18 is actuated upward by this compressed air, and the start valve 15 is actuated in the off state.

  In short, by operating the valve stem 19 from the bottom dead center position to the ON position directed upward by the dimension A shown in FIG. 3B, the start valve 15 is activated to drive the striking mechanism. When the valve stem 19 is operated downward from the ON operation state and is operated from the bottom dead center position to the B position OFF position as shown in FIG. 3C, the start valve 15 is operated to the OFF state. The striking mechanism is returned to the initial state.

  An activation device 30 for operating the valve stem 19 is formed below the valve stem 19 protruding downward from the valve housing 16 of the activation valve 15. As shown in FIG. 1, the activation device 30 includes a trigger lever 32 formed on a base portion of the grip portion 8 so as to be rotatable by a pivot shaft 31 so as to be operated by a finger of the hand holding the grip portion 8, and a nail The valve stem 19 is operated by engaging with the contact arm 33 slidably supported along the nose portion 7 in which the injection port 6 for guiding and driving is formed, and the valve stem 19 of the start valve 15. Thus, the contact lever 34 is disposed between both side walls of the trigger lever 32. The contact arm 33 has a lower end portion 33a that protrudes toward the tip of the injection port 6. By pressing the nose portion 7 against the driven material, the lower end portion 33a is engaged with the driven material. A slide operation is performed along the nose portion 7.

  As shown in detail in FIG. 2, the trigger lever 32 has a U-shaped cross section, and is pivotally supported on the housing 2 by a pivot shaft 31 at its front end to grip the grip portion 8. The finger can be rotated about the pivot shaft 31 by a finger of the hand. A contact lever 34 for engaging with the valve stem 19 of the starting valve 15 to push up the valve stem 19 is disposed between both side walls of the trigger lever 32. A base end 35 is rotatably supported by a support shaft 37 extending between both side walls of the lever 32, and the other end of the contact lever 34 extends in the direction of the pivot shaft 31 of the trigger lever 32. Arranged to form an operating end 36.

  Further, an L-shaped piece 38 integrally formed with a vertical piece 38 a extending vertically upward is attached to the upper end of the contact arm 33, and a spring 39 disposed on the upper surface of the L-shaped piece 38 is attached. The L-shaped piece 38 and the contact arm 33 are slid and biased downward, and the lower end portion 33a of the contact arm 33 is disposed so as to protrude toward the distal end of the injection port 6 by this biasing force. The vertical piece 38a extending above the L-shaped piece 38 is engaged with the operation end 36 of the contact lever to support the operation end 36 from the lower surface side, and the support lever 41 And an operation lever 42 for rotating the support lever 41 so as to disengage the engagement between the operation end 36 and the operation end 36. The operation lever 41 and the operation lever 42 are slid up and down integrally with the L-shaped piece 38 as the contact arm 33 slides.

  As shown in FIGS. 4 and 5, a pair of flange portions 40 extending in parallel from both side edges of the vertical piece 38 a of the L-shaped piece 38 toward the front side are formed, and the inside of the pair of flange portions 40 is formed. Further, the support lever 41 is supported on the outside of the flange portion 40 so that the operation lever 42 can be independently rotated. The support lever 41 is formed with a support portion 43 extending upward so as to face the operation end 36 of the contact lever 34 whose base end portion 35 is rotatably held by the trigger lever 32. 43 is biased by a spring or the like (not shown) to a position facing the operation end 36 of the contact lever 34 and facing in the vertical direction. Further, on both sides of the operation lever 42, an operation arm 44 extending rearward in the horizontal direction is formed, and an engagement protrusion 45 protruding in the outer surface direction is formed on an end of the operation arm 44. . As shown in FIGS. 6 and 7, the trigger lever 32 is formed with an engagement piece 46 that can be engaged with the engagement protrusion 45 of the operation arm 44. The engagement piece 46 is formed as shown in FIG. As shown, the trigger lever 32 in the continuous hit mode is disposed above the engagement protrusion 45 formed on the end of the operation arm 44 of the operation lever 42, and the contact arm 33 in the single shot mode is moved upward. When the trigger lever 32 is rotated after the slide operation, the engagement piece 46 is arranged on the lower surface side of the engagement projection 45 of the operation arm 44 operated upward as shown in FIG. Has been.

  As shown in FIG. 6, when the contact arm 33 is slid upward after the trigger lever 32 is rotated, the operation arm 44 of the operation lever 42 is slid upward together with the contact arm 33. When the engagement protrusion 45 is engaged with the lower surface side of the engagement piece 46 of the trigger lever 32, the operation lever 42 is rotated in the direction around the hour hand. Engaging pins 47 that can be engaged with operating arms 44 formed on both sides of the operating lever 42 protrude from both side surfaces of the support lever 41. As described above, the operating lever 42 rotates around the hour hand. When rotating in the direction, the operating arm 44 of the operating lever 42 is not engaged with the engaging pin 47 and the support lever 41 is not rotated. As shown in FIG. 7, after the contact arm 33 is slid upward, the trigger lever 32 is rotated, whereby the engagement piece 46 is disposed below the operation lever 42. From this state, the contact arm 33 is moved downward. The engagement protrusion 45 formed on the operation arm 44 of the operation lever 42 that is operated downward together with the contact arm 33 is engaged with the upper surface side of the engagement piece 46 of the trigger lever 32 when this is operated. Accordingly, the operation lever 42 is rotated in the counterclockwise direction, the operation arm 44 of the operation lever 42 is engaged with the engagement pin 47 of the support lever 41, and the support lever 41 is rotated in the counterclockwise direction. The support portion 43 of the support lever 41 is rotated in a direction to avoid engagement with the operation end 36 of the contact lever 34.

  Each operation mode of the continuous driving mode and the single shot mode by the starting device 30 of the nailing machine 1 having the above configuration will be described. When selecting the continuous hitting mode, as shown in FIG. 8, first, the trigger lever 32 is pulled by the finger of the hand holding the grip portion 8 to rotate the trigger lever 32 to the maximum pulling operation position. . By pulling the trigger lever 32 in this way, the base end portion 35 side of the contact lever 34 is rotated in the counterclockwise direction so that the base end portion 35 side of the contact lever 34 is moved upward via the support shaft 37 installed on the trigger lever 32. In this state, the back surface of the contact lever 34 is engaged with the valve stem 19. In this state, the valve stem 19 of the activation valve 15 is not operated to the ON position, and the nail driver 1 is not activated. By the turning operation of the trigger lever 32 described above, the engagement piece 46 formed on the trigger lever 32 is disposed above the engagement protrusion 44 of the operation lever 42.

  Next, as shown in FIG. 9, the nose portion 7 of the nailing machine 1 is swung down from above to the surface of the material to be driven so that the tip of the nose portion 7 strikes the surface of the material to be driven. Then, the contact arm 33 is slid upward. By operating the contact arm 33, an L-shaped piece 38 formed at the upper end of the contact arm 33, and a support lever 41 and an operating lever 42 supported by the L-shaped piece 38 are integrally operated upward. . The support portion 43 of the support lever 41 engages with the operation end 36 of the contact lever 34 and moves the operation end 36 of the contact lever 34 upward to rotate the contact lever 34 about the support shaft 37. When the valve stem 19 is pushed up by the back surface of the contact lever 34 thus rotated, and the valve stem 19 is operated to the on position shown in FIG. 3B, the start valve 15 is turned on. Then, the striking mechanism is activated and the nail is driven into the material to be driven.

  When the support lever 41 and the operating lever 42 are actuated upward together with the L-shaped piece 38 by the upward sliding movement of the contact arm 33, the engagement protrusion 45 formed on the operating arm 44 of the operating lever 42 becomes the trigger lever. The operating lever 42 is rotated in the direction around the hour hand by engaging with the lower surface of the 32 engaging pieces 46, but the operating arm 44 of the operating lever 42 does not engage with the engaging pin 47, The support lever 41 is maintained in an engaged state with the operation end 36 of the contact lever 34 without being affected, and the contact lever 34 is rotated to turn on the activation valve 15 to activate the nail driver 1. Let Further, since the tip 43 of the support lever 41 is set at a high position, the activation valve 15 is turned on at an early timing of the operation stroke of the contact arm, and the reaction when driving the nail is reduced.

  When the nose portion 7 of the nailing machine 1 is moved away from the surface to be driven with the trigger lever 32 being pulled after the first nail driving by the above operation, as shown in FIG. 38 and the contact arm 33 are moved downward by the action of the spring 39, and the support lever 41 and the operation lever 42 supported by the L-shaped piece 38 are also lowered together with the L-shaped piece 38 to operate the contact lever 34. The end 36 side moves downward and rotates in the counterclockwise direction around the proximal end 35 side, and with this rotation, the valve stem 19 descends and the start valve 15 is turned off to hit the striking mechanism. Returns to the initial state. At this time, when the engagement protrusion 45 of the operation lever 42 is separated from the engagement piece 46 of the trigger lever 32, the operation lever 42 returns to its initial position. When the nailing machine 1 is swung down again from this state and the contact arm 33 is operated, the L-shaped piece 38, the support lever 41 and the operation lever 42 move upward together with the contact arm 33, and the contact portion 43 contacts the contact lever 41. Since the operation end 36 side of the lever 34 is rotated upward to push up the valve stem 19 to the top dead center, the start valve 15 is turned on again and the striking mechanism is driven.

  In this way, each time the contact arm 33 is operated by repeatedly pressing and moving the nose portion 7 of the nailing machine 1 against the material to be driven while the trigger lever 32 is pulled, the start valve 15 is operated. Is turned on and off, and the striking mechanism is continuously driven, so that continuous striking can be performed. Further, if the trigger lever 32 is released after a series of continuous nailing operations are completed, the L-shaped piece 38, the support lever 41, and the operation lever 42 are restored to the initial state shown in FIG. By simply pulling the trigger lever 32 and holding this state prior to the operation of the contact arm 33 as described above, the continuous hitting mode can be set, and the contact arm 33 is continuously held while the trigger lever 32 is held. This makes it possible to drive the nails continuously.

  Next, when nailing is performed in the single shot mode, the nose portion 7 of the nailing machine 1 is pressed against the material to be driven before the trigger lever 32 is operated, and the contact arm 33 is slid upward. Since the trigger lever 32 is not rotated, the engagement protrusion 45 of the operation lever 42 is not engaged with the engagement piece 46 of the trigger lever 32, and the support lever 41 and the operation lever 42 are moved as shown in FIG. The L-shaped piece 38 fixed to the upper end of the contact arm 33 is operated to move upward. The contact lever 34 is installed on the trigger lever 32 so that the support portion 43 formed on the support lever 41 engages with the operation end 36 of the contact lever 34 and moves the operation end 36 side of the contact lever 34 upward. It is rotated about the existing support shaft 37. In this state, since the trigger lever 32 is not operated to rotate, the base end portion 35 side of the contact lever 34 is disposed below, and the back surface of the contact lever 34 is not operated to push up the valve stem 19, so that the nail driving is performed. Machine 1 is not activated.

  Thereafter, by pulling the trigger lever 32, as shown in FIG. 11, the trigger lever 32 is rotated about the pivot shaft 31, and the support shaft 37 is moved upward. The base end 35 side is rotated so as to be pushed upward. The operation end 36 of the contact lever 34 is supported at a high position by the support portion 43 of the support lever 41, and the contact lever 34 is operated by rotating the base end portion 35 side of the contact lever 34 upward as described above. Rotating counterclockwise around the end 36 side, the valve lever 19 of the start valve 15 is pushed upward by the back surface of the contact lever 34 and the start valve 15 is turned on to operate the nailer 1. Start. Note that the engagement piece 46 formed on the trigger lever 32 by the turning operation of the trigger lever 32 at this time is disposed below the engagement protrusion 45 formed on the operation arm 44 of the operation lever 42.

  When the nail driver 1 is driven as described above by operating the contact arm 33 and the trigger lever 32, the nail driver 1 is moved up by the reaction and the tip of the nose portion 7 is separated from the surface of the material to be driven. This may cause the contact arm 33 to slide downward. When the contact arm 33 operates downward, the support lever 41 and the operation lever 42 supported by the L-shaped piece 38 attached to the upper end of the contact arm 33 move downward together with the contact arm 33 as shown in FIG. To do. When the operation lever 42 supported by the L-shaped piece 38 is lowered, the engagement protrusion 45 formed on the operation arm 44 engages with the upper surface of the engagement piece 46 of the trigger lever 32 so that the operation lever 42 is counteracted. It is rotated in the direction around the hour hand. When the operation lever 42 is rotated, the operation arm 44 of the operation lever 42 is engaged with the operation pin 47 of the support lever 41 to rotate the support lever 41 in the counterclockwise direction. By rotating the support lever 41 in this way, the support portion 43 of the support lever 41 is separated from the operation end 36 of the contact lever 34, and the operation end 36 of the contact lever 34 is rotated downward at a stroke, so that the valve stem. 19 is operated to the bottom dead center, the start valve 15 is turned off, and the nail driver 1 is returned to the initial state. At this time, the operation end 36 of the contact lever 34 is disposed at a position retracted from the slide operation locus of the L-shaped piece 38.

  When the nail driving machine 1 moved up by the reaction is lowered onto the workpiece and the contact arm 33 is operated again upward, as shown in FIG. 38, the support lever 41 supported by the L-shaped piece 38, and the operation lever 42 are moved upward. At this time, the operation end 36 of the contact lever 34 moves backward from the slide operation locus of the L-shaped piece 38. The contact lever 34 is not rotated by the support portion 43 of the support lever 41 supported by the L-shaped piece 38. Therefore, even if the contact arm 33 is reactivated due to the reaction of the nailing machine 1 as described above, the nail driving machine 1 is not restarted, and therefore dribbling can be prevented. After the nail driving in the single shot mode is completed as described above, the nose portion 7 of the nailing machine 1 is moved away from the surface of the material to be driven and the contact arm 33 is returned downward and the trigger lever 32 is operated. By releasing, the starting device 30 returns to the initial state shown in FIG.

  During the single shot mode operation, the contact arm 33 is operated to support the operation end 36 side of the contact lever 33 in the upper position via the support lever 41, and the trigger lever 32 is subsequently rotated. The base end portion 35 side of the contact lever 34 is rotated upward to operate the valve stem 19 to the ON position, and the engagement piece 46 is arranged below the support lever 41 by the operation of the trigger lever 32 to react. When the contact arm 33 moves downward, the operation lever 42 is rotated by the engagement piece 46 and the support lever 41 is rotated via the operation lever 42 to support the contact lever 34 by the support lever 41. And the operation end 36 of the contact lever 34 is on the slide trajectory of the contact arm 33. And so as to disposed to the retracted position. As a result, the nail driver 1 jumps upward due to the reaction of the nail driving in the single shot mode, and then dribbling even if the contact arm 33 is actuated again by the nail driver 1 landing on the material to be driven again. The occurrence of strikes can be prevented.

  Further, when the contact arm 33 is not operated, the valve stem 19 of the start valve 15 is always lowered to the bottom dead center and the start valve 15 is turned off. Even if the trigger lever 32 is operated to maintain the single shot mode state, the nailing machine 1 is not started even if the nailing machine 1 is connected to the compressed air source, and a malfunction during connection is prevented. Can do.

Longitudinal side view showing a nailing machine equipped with the starter of the present invention Longitudinal side view of the main part of the nailing machine of FIG. It is sectional drawing which shows the action | operation state of the starting valve of the nailing machine of FIG. 1, (a) is the state before the operation | movement which has arrange | positioned a valve stem in a bottom dead center position, (b) is a valve stem from a bottom dead center. (C) shows a state where the valve stem is operated from the top dead center to the bottom dead center and the start valve is turned off. Exploded perspective view of parts forming the main part of the starting device The perspective view which shows the assembly | attachment state of the same component as FIG. Longitudinal side view with the trigger lever of the starter turned first Longitudinal side view with the trigger lever rotated following the contact arm operation Sectional drawing which shows the operating state of the starting device which pulled and operated the trigger lever in continuous hammering mode The same sectional view as FIG. 8 showing the operating state of the starting device in which the contact arm is operated and the starting valve is turned on. Sectional drawing which shows the operating state of the starting device which operated the contact arm in single shot mode The same sectional view as FIG. 10 showing the operating state of the starting device in which the trigger valve is turned and the starting valve is turned on. 10 is a cross-sectional view similar to FIG. The same sectional view as FIG. 10 showing the operating state of the activation device in which the contact arm is again operated in the direction of the top dead center.

Explanation of symbols

1 Nailing Machine 15 Start Valve 19 Valve Stem 30 Start Device 32 Trigger Lever 33 Contact Arm 34 Contact Lever 35 Base End 36 Operation End 41 Support Lever 42 Operation Lever

Claims (1)

A striking mechanism that impactively drives a driver that strikes the nail, a housing that houses the striking mechanism and that has a nose portion that slidably guides the driver, and compressed air is applied to the striking mechanism. An actuating valve for operating the driver to drive the driver and exhausting the compressed air that has driven the driver to return the striking mechanism to the initial position; a trigger lever operated by a finger holding the housing; An activation device composed of a contact arm operated by bringing the nose portion into contact with the workpiece,
In the nailing machine in which the activation valve is operated by the activation device, the activation device further includes a support lever rotatably provided at a tip of the contact arm so as to engage with an operation end of the contact lever. It is configured with an operating lever for rotating the support lever so as to release the engagement between the support lever and the contact lever in cooperation with the engagement piece formed on the trigger lever, the trigger In the continuous driving mode in which a nail is driven every time the nose portion is brought into contact with the driven material while the lever is rotated, the base end of the contact lever is operated upward by rotating the trigger lever, and the contact arm a support lever for moving operation upward interlocked by engaging the operating end of the contact lever and by actuating the operating end upward Together so as to turn on actuating the Rubusutemu, the single-handed mode to operate the trigger lever followed contact arm and is arranged below the operating lever engagement piece of the trigger lever by rotating operation of the trigger lever, nails By engaging the operating lever that operates downward with the contact arm by the reaction of the hammer, the support lever is rotated via the operating lever to release the engagement between the support lever and the contact lever. A starting device for a nailer characterized by the above.

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