JPH0636783U - Starter for continuous hammering nailer - Google Patents

Abstract

(57) [Summary] [Structure] The trigger lock 38 is engaged with the lock release lever 30 at a predetermined angle at the position where the trigger member 7 is pulled, so that the contact member 6 is covered during continuous hammering or after nailing. When the pulling operation of the trigger member 7 is released before the trigger member 7 is separated from the driving material, the lock release lever 30 and the trigger lock lever 29 are brought into contact with the contact member 6 and the housing, respectively, thereby preventing the trigger member 7 from operating in the returning direction. I did it. [Effect] The trigger member 7 is prevented from operating in the return direction, and the operation of the nailing machine does not stop even if the pulling operation on the trigger member 7 is released during continuous hammering. The occurrence of supply failure can be reliably prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a continuous striking nailing machine for striking a nail into a material to be hammered by continuously striking one nail by using a striking mechanism using compressed air. The present invention relates to a starting device that improves the inconvenience caused by canceling the pulling operation on the trigger member immediately after the driving is completed (before the nail driving machine is separated from the driven material).

[0002]

[Prior art]

 A continuous hammering type nailer of this type is known from Japanese Patent Application No. 4-6321. In the above-described nailing machine, the hammering mechanism is driven multiple times after the nailing machine is started to continuously hammer the nails.Therefore, immediately after the trigger member is operated by pulling the trigger member to start the nailing machine. If the pulling operation is released, the trigger valve will return and the head valve will be closed based on this, and the impact will stop while the nail is being driven.

In addition, in the state where the hammering is completed and the striking piston is stopped at the bottom dead center position, the air switching valve mechanism (O-ring) of the movable cylinder stops both supply and exhaust. Therefore, even if the pulling operation of the trigger member is released and the head valve is closed, the striking piston is not lifted and returned. For the first time, the movable cylinder is moved downward by spring force by the action of separating the nailing machine from the material to be driven, and the switching valve mechanism operates to switch compressed air, connecting the inside of the movable cylinder to the exhaust port. As a result, the striking piston is returned. Moreover, when the pulling operation of the trigger member is released, the nail supply mechanism is operated to supply the nail to the injection portion. Therefore, if the pulling operation of the trigger member is canceled before the operation of lifting the nailing machine from the state where the nail driving operation is stopped and separating the contact member from the driven material, the striking piston returns upward and the inside of the injection part Since the nail supply mechanism operates and the leading nail is supplied to the ejection part before the impact driver of the above-mentioned retreats from the ejection part, the nail is pressed against the side surface of the impact driver in the ejection part. Even if the nailing machine is lifted after this to try to restore the striking piston, the pushing force of the nail against the striking driver becomes a great resistance to prevent the striking piston from returning to the normal position, resulting in a so-called poor return. Occur.

As described above, in the nail driving machine having the above-mentioned mechanism, it is necessary to continue the pulling operation of the trigger member during the driving operation, and the nail driving machine is released before releasing the pulling of the trigger member after the driving operation is completed. The troublesome operation procedure of having to separate the material to be driven is required.

[0005]

[The purpose of the device]

 The present invention has been made in view of the above problems, and even if the pulling operation of the trigger member is released during continuous hammering, continuous hammering of the nailing machine does not stop, and contact is made after nailing is completed. Even if the pulling operation of the trigger member is released before the member is separated from the material to be driven, a defective return of the striking mechanism does not occur, and it is triggered only by the operation to separate the nailer from the material to be driven. It is an object of the present invention to provide a drive device capable of returning the valve.

[0006]

[Means for achieving the purpose]

 In order to achieve the above-mentioned object, a starting device for a continuous hammering type nailing machine according to the present invention comprises a hammering mechanism for continuously reciprocating a hammering driver for hammering a nail, and supplying compressed air to the hammering mechanism to start the hammering mechanism. A trigger valve, a cylindrical injection part that is arranged below the percussion mechanism and allows the percussion driver to slide inside, and a cylindrical injection part that is arranged around the injection part and is pressed against the material to be hammered to the injection part. In a continuous hammering nailer having a contact member that operates relatively and a manually operable trigger member that operates the valve system of the trigger valve in cooperation with the operation of the contact member, On the other hand, when the trigger member is pulled, one end is locked in the housing to prevent the trigger member from being pulled up, and the other end is pushed up by the contact member to rotate. A lock release lever that moves and a trigger lever that has one end supported by the housing and that activates the valve stem of the trigger valve when the trigger member is pulled are rotatably provided to unlock the trigger lock lever. The lever is rotated so that it does not engage with the housing via the spring, and the trigger lock lever has a lock release lever whose one end is pushed up by the operation of the contact member when the trigger member is pulled. A trigger lock that engages with the other end at a predetermined angle is rotatably provided, and the return operation of the trigger member is prevented by bringing the lock release lever and the trigger lock lever into contact with the contact member and the housing, respectively. On the other hand, the trigger lever has a return movement of the contact member. It is characterized by forming a cam surface that rotates to release the engagement state of the trigger lock when the trigger member is actuated in the returning direction after the operation.

[0007]

[Action]

 In the above configuration, even if the trigger member is directly pulled before the tip of the contact member is pressed against the material to be driven when the nail driver is activated, the trigger lock lever causes the locking groove on the upper bottom surface of the housing. The trigger member is locked and cannot be pulled up. For this reason, the nail member cannot be operated because the trigger member 7 cannot be operated either.

Next, when the tip of the contact member is pressed against the material to be driven, the contact member moves relative to the nailing machine, and the other end pushes up the lock release lever to rotate it. At the same time, the trigger lock lever also rotates via the spring. Since the rotated trigger lock lever cannot be locked in the housing, the pulling operation of the trigger member is allowed, and this operation causes the middle part of the trigger lever to press the trigger valve stem of the trigger valve, thus starting the nailer. , Repeated hits.

Further, if the pulling operation of the trigger member is attempted to be released before the contact member is separated from the driven material during continuous hammering or after nailing is finished, the trigger lock is engaged with the lock release lever at a predetermined angle. At the same time, the end of the lock release lever contacts the contact member, and the trigger lock lever contacts the housing. Therefore, the return operation of the trigger member is prevented, and the pulling operation on the trigger member is not released, so the operation of the nailing machine does not stop.

Finally, when the contact member is separated from the material to be driven, the unlocking lever loses its support, so that the pulling operation of the trigger member is allowed to be released, which causes the trigger lever to rotate and its cam surface to move. Since the engagement state with the trigger lock is released, the lock release lever and the trigger lock are returned to the initial position, and the trigger valve is operated to return.

[0011]

【Example】

 FIG. 1 is a vertical cross-sectional view of a continuous striking type nailing machine, in which a main body 1 of the nailing machine has a striking mechanism 2 for continuously striking a nail, and compressed air is supplied to the striking mechanism 2 to start the nailing mechanism. The trigger valve 3, the cylindrical injection part 4 arranged below the striking mechanism 2, and the injection part 4 which is arranged around the injection part 4 and is pressed against the material 5 to be driven, relative to the injection part 4. A contact member 6 that operates, a trigger member 7 that can be manually operated to operate the trigger valve 3 in cooperation with the operation of the contact member 6, and a nail supply mechanism 8 that supplies a nail into the injection portion 4. have.

The striking mechanism 2 is integrally coupled to the striking piston 10, a movable cylinder 9 slidably accommodated in the main body 1, a striking piston 10 slidably accommodated in the movable cylinder 9. And a striking driver 11 slidably guided and housed in the injection part 4, and compressed air is supplied to or stopped from the movable cylinder 9 to control continuous driving and stopping of the movable cylinder 9 and the striking piston 10. And a head valve 12 that operates.

Then, by pulling the trigger member 7 and pushing in the trigger valve stem 13 of the trigger valve 3 as described later, the head valve 12 is opened and actuated, and the main chamber (the chamber leading to the grip connected to the compressed air supply source is connected). ) The compressed air in 14 is introduced into the upper part of the movable cylinder 9, and when the pressure drives the striking piston 10 downward, the reaction causes the movable cylinder 9 to move upward (above the figure), Since the exhaust passage shown by the solid line is opened by the upward movement, the compressed air in the movable cylinder 9 is exhausted from the exhaust hole 15, and the movable cylinder 9 is depressurized. The pressure from the blowback chamber 14a against the lower surface of the striking piston 10 causes the striking piston 10 to rise, and at the same time, the spring 16 causes the movable cylinder 9 to move downward. When the movable cylinder 9 operates downward (below in the figure), compressed air in the main chamber 14 is introduced to drive the striking piston 10 downward again. In this way, the striking piston 10 is continuously moved up and down to continuously strike the nails P in the injection part 4 to drive the material 5 to be driven, and when the striking piston 10 reaches the bottom dead center after the nail driving is completed. Since there is no recoil, the situation shown in the figure is reached and the driving operation automatically stops. In this state, since the striking driver 11 and the nail P are in contact with each other, the two O-rings 41 and 42 (air switching valve mechanism section) on the upper part of the movable cylinder 9 are in the sealed state, and the supply / exhaust air is supplied. Is not done. After that, the nail driver is separated from the material 5 to be driven, so that the impact driver 8 is separated from the nail P, so that the movable cylinder 9 is moved downward by the spring 16. When the pulling operation of the trigger member 7 is further released, the exhaust passage shown by the dotted line in the figure opens, the compressed air inside the movable cylinder 9 is exhausted, the striking piston 10 moves upward, and the driving operation is completed.

If the trigger member 7 is released after the driving is completed and before the nailer is separated, the head valve 12 is closed as shown in the figure, and the movable cylinder 9 cannot be returned. When the trigger member 7 is released during the repeated hits, the blowback chamber 14a cannot store sufficient compressed air, resulting in a return failure.

The trigger valve 3 operates the head valve 12 as described above by selectively connecting the air passage 17 communicating with the head valve 12 with the atmosphere and the air passage communicating with the main chamber by the operation of the trigger valve stem 13. In addition to controlling, the operation of the nail supply mechanism 8 is controlled. That is, the nail supply mechanism 8 accommodates the feed piston 21b slidably in the feed cylinder 21a along the nail feed passage, and forms the nail feed pawl 18 at the tip of the piston rod connected to the feed piston 21b. In the trigger valve 3, one end of the first air passage 20 opens at the same height position as the opening end of the air passage 19 leading to the main chamber 14, and the other end is at the front end of the feed cylinder 21a. It is open. Therefore, the first air passage 20 is filled with the compressed air in the main chamber 14 regardless of the operation of the trigger valve stem 13, and is constantly supplied to the front end of the feed cylinder 21a. On the other hand, the trigger valve 3 is provided with an O-ring 23 that selectively connects the second air passage 22 connected to the rear end side of the feed cylinder 21a to the main chamber 14 and the atmosphere. Therefore, when the trigger valve stem 13 is pushed against the spring 24 (during the pulling operation of the trigger member 7), the second air passage 22 is exhausted, the feed piston 21b is retracted, and the trigger valve stem is retracted. When 13 is restored (when the pulling operation of the trigger member 7 is effectively released), compressed air is supplied to both ends of the feed cylinder 21a, and the feed piston 21b moves in the nail feeding direction due to the difference in pressure receiving area. The nails in the nail feed passage are moved to be supplied to the injection unit 4 by the nail feed nails 18.

The operation of the trigger valve stem 13 is performed by the pulling operation of the trigger member 7 as described above. As shown in FIG. 2, a trigger lever 25 is rotatably supported at the tip of the trigger member 7, and one end of the trigger lever 25 is engaged with and supported by an engaging step portion 26 of the housing. At the time of pulling operation, when the intermediate portion pushes the trigger valve stem 13 of the trigger valve 3 to operate the trigger valve 3 and releases the pulling operation of the trigger member 7, the trigger valve stem 13 is returned to the original operation by the spring force. .

By the way, a starting device including a lock mechanism is provided in the housing 27 between the trigger member 7, the trigger valve 3, and the upper end portion 6 b of the contact member 6. That is, a trigger lock lever 29 and a lock release lever 30 are rotatably supported on the trigger member 7 on a support shaft 28 common to the trigger lever 25.

At one end of the trigger lock lever 29, a protrusion 31 that protrudes to the upper part of the drawing is formed. The protrusion 31 is arranged so as to face a locking groove 32 formed on the upper bottom surface of the housing 27. The trigger lock lever 29 is biased by a spring (not shown) having a weak force so that the protrusion 31 comes into contact with the side surface of the trigger member 7.

A protrusion 33 that can be engaged with the upper end of the contact member 6 is formed at one end of the lock release lever 30, and an L-shaped engaging claw 34 is cut out at the other end at the lower end. .

A support shaft 35 is provided at the end of the trigger lock lever 29. One end of the coil spring 36 wound around the support shaft 35 is the trigger lock lever 29, and the other end is the lock release lever 30. When the lock release lever 30 rotates counterclockwise in the drawing, the trigger lock lever 29 also rotates in conjunction with the lock spring 29 via the coil spring 36. . A protrusion 37 is formed on the lower bottom surface of the housing 27 at a position corresponding to the lower surface of the trigger lock lever 29 on the support shaft 35 side when the trigger lock lever 29 is rotated counterclockwise in the figure. Has been done.

Further, a trigger lock 38 is rotatably provided on the support shaft 35 of the trigger lock lever 29. The trigger lock 38 is always spring-biased in the clockwise direction, and its front end is formed so as to engage with the lock release lever 30 and the trigger lever 25. A cam surface 39 that engages with the trigger lock 38 is formed on the support shaft 28 side of the trigger lever 25, and an engagement claw 34 of the lock release lever 30 is also formed so as to be engageable with the trigger lock 38.

In the above configuration, when the nailing machine is started, even if the trigger member 7 is directly pulled before the tip of the contact member 6 is pressed against the driven material 5, as shown in FIG. Since the protrusion 31 of the lever 29 is locked in the locking groove 32 on the upper bottom surface of the housing 27, the trigger member 7 is locked and cannot be pulled up. Therefore, the trigger valve 3 does not operate either, so the nailer is not activated.

Next, when the lower end 6a of the contact member 6 is pressed against the material 5 to be driven, the contact member 6 moves relatively upward, so that the upper end 6b of the contact member 6 has a lock release lever as shown in FIG. The lock release lever 30 is rotated counterclockwise by engaging and pushing up the protrusion 33 at one end of the lock release lever 30. In conjunction with this, the trigger lock lever 29 also rotates counterclockwise. Thereafter, when the trigger member 7 is pulled as shown in FIG. 5, the projection 31 of the trigger lock lever 29 cannot be locked in the locking groove 32 of the housing 27, so that the trigger member 7 is pulled up and the trigger lever 7 is pulled up. The intermediate portion of 25 can press the trigger valve stem 13 of the trigger valve 3 to open the head valve 12 and activate the nailing machine. At the same time, compressed air is supplied to the front end of the feed cylinder 21a of the nail supply mechanism 8, and the nail supply mechanism 8 is returned to the standby state to supply the nails.

By the way, since the lock release lever 30 and the trigger lever 25 rotate clockwise around the support shaft 28 while the trigger member 7 is being pulled up, the trigger lock 38 engages with the cam surface 39 of the lock release lever 30. It rotates together in the counterclockwise direction. Then, immediately before the trigger member 7 reaches the upper moving end, when the engagement with the cam surface 39 is released, the trigger lock 38 is rotated clockwise by the spring force, but its front end is locked. The release claw 34 of the release lever 30 is pushed into the inner side beyond the outer side surface (see FIG. 6). Further, since the support shaft 28 also moves upward as the trigger member 7 is pulled up, the trigger lock lever 29 and the lock release lever 30 are bent around the support shaft 28 against the spring force of the coil spring 36.

When the pulling operation of the trigger member 7 is released in this state, the trigger member 7 tries to operate (move downward) in the returning direction, but the tip of the trigger lock 38 is engaged with the engaging pawl 34 of the lock release lever 30. To meet. Since the end of the lock release lever 30 is in contact with and supported by the contact member 6, the angle between the trigger lock 38 and the lock release lever 30, and hence the angle between the trigger lock lever 29 and the lock release lever 30. Since the trigger member 7 moves downward in this state, the end portion of the trigger lock lever 29 on the support shaft 35 side (in this example, the base end portion of the trigger lock 38) of the housing 27 is fixed as shown in FIG. It comes into contact with the convex portion 37 on the lower bottom surface. Therefore, the trigger member 7 is prevented from operating in the returning direction. Therefore, even if the pulling operation with respect to the trigger member 7 is released during continuous hammering, the trigger member 7 does not operate effectively and the pushing state with respect to the trigger valve stem 13 remains locked. The operation does not stop. The nailer will automatically stop when nailing is complete.

Next, by lifting the nailing machine and separating the contact member 6 from the material 5 to be driven, the end portion of the lock release lever 30 loses its support and is rotatable as shown in FIGS. 8 and 9. Therefore, the returning operation (downward movement) of the trigger member 7 is allowed. When the trigger member 7 is moved downward, the trigger valve stem 13 is restored, so that the head valve 12 is closed and the striking mechanism 2 is returned to the initial state. When the trigger member 7 moves downward, the end portion of the trigger lever 25 is supported by the engagement step portion 26, so that it rotates counterclockwise around the support shaft 28 and its cam surface 39 triggers. By engaging the lock 38 and rotating it in the counterclockwise direction, the engagement state between the trigger lock 38 and the lock release lever 30 is released. Then, as shown in FIG. 10, the tip of the trigger lever 25 wraps around the lower side of the trigger lock 38 and returns to the initial position. At the same time, as the contact member 6 moves downward relative to the nail driver, the movable cylinder 9 further moves downward by the spring 16 shown in FIG. 1, so that the compressed air is switched and the impact piston 10 automatically moves. And the trigger valve stem 13 is returned by the downward movement of the trigger member 7, compressed air is supplied to the rear end of the feed cylinder 21a of the nail supply mechanism 8, and the nail supply mechanism 8 is operated to operate the nail supply mechanism 8. Is supplied.

[0027]

【effect】

 According to the present invention, even if the pulling operation of the trigger member is released during the continuous striking operation, the trigger valve stem does not return, so that the striking mechanism is prevented from stopping during the striking. Also, when the trigger member is released after the completion of driving and before the nail driver is separated from the material to be driven, similarly, the trigger valve stem is locked without returning and the nail supply mechanism operates. The trigger member is released by lifting the nail driver and moving the contact member away from the material to be driven, and the trigger valve is reset and the striking mechanism is automatically reset. Further, by relating the operation of the nail supply mechanism to the operation of returning the trigger valve, it is possible to supply the nail after the returning of the striking mechanism. Therefore, it is possible to reliably prevent the return failure of the striking mechanism and the supply failure of the nails.

Furthermore, since a troublesome operation procedure for restricting the order of releasing the trigger member and lifting the nailing machine after driving is unnecessary, the driving operation can be performed easily.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an entire continuous striking type nailing machine according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a starting device of the nail driver.

FIG. 3 is an explanatory view of a linked state between a trigger lock lever and a lock release lever of the starting device.

FIG. 4 is a diagram illustrating an operation mode of the activation device.

FIG. 5 is an explanatory view of an operation mode of the starting device.

FIG. 6 is a diagram illustrating an operation mode of the activation device.

FIG. 7 is a diagram illustrating an operation mode of the activation device.

FIG. 8 is an explanatory diagram of an operation mode of the activation device.

FIG. 9 is a diagram illustrating an operation mode of the activation device.

FIG. 10 is a diagram illustrating an operation mode of the activation device.

[Explanation of symbols]

 2 Striking mechanism 3 Trigger valve 4 Injection part 5 Target material 6 Contact member 7 Trigger member 25 Trigger lever 27 Housing 29 Trigger lock lever 30 Lock release lever 38 Trigger lock 39 Cam surface

Claims (1)

[Scope of utility model registration request] 1. A striking mechanism for continuously reciprocating a striking driver for striking a nail, a trigger valve for supplying compressed air to the striking mechanism to activate the striking mechanism, and a striking driver disposed below the striking mechanism. A cylindrical injection part that can slide inside, a contact member that is arranged around the injection part and that operates relative to the injection part by a pressing operation on a material to be driven, and the operation and cooperation of the contact member. A continuous striking nailing machine having a manually operable trigger member for operating the valve stem of the trigger valve, wherein the trigger member has one end locked to the housing when the trigger member is pulled. And a lock release lever that is pushed up by the contact member to rotate and a one end is supported by the housing. The trigger lever is rotatably provided in the middle part to operate the valve stem of the trigger valve when pulling the trigger member, and the trigger lock lever is rotated by the lock release lever so as not to be locked to the housing via the spring. At the same time, the trigger lock lever has a trigger lock that engages at a predetermined angle with the other end of the lock release lever whose one end is pushed up by the operation of the contact member when the trigger member is pulled. The lock release lever and the trigger lock lever are provided rotatably, respectively, to prevent the return member from operating in the return direction by bringing the lock release lever and the trigger lock lever into contact with the contact member and the housing, respectively. Later, when the trigger member is actuated in the return direction, it will rotate and the trigger lock A starting device for a continuous hammering type nailing machine, characterized in that a cam surface for releasing the engaged state is formed.