JPH0560776U - Nail supply mechanism for continuous nailing machine - Google Patents

Abstract

(57) [Abstract] [Purpose] A nail feeding mechanism can be operated automatically or manually in a continuous hammering type nailing machine, and two nails are prevented from being fed at the time of manual operation. The starter valve 7 is provided with a supply switching valve portion 26 for constantly supplying air and selectively communicating an air passage to the rear end of the feed cylinder with the main chamber 15 and the atmosphere. A switching valve 35 that selects the air passage to the rear end of the feed cylinder between the switching valve section and the main chamber is arranged. Between the switching valve and the rear end of the feed cylinder, the rear end side of the feed cylinder is selected as the switching valve and the atmosphere. The supply valve 36 is installed. A lock plate 49 for locking the operation button 48 and the operation button 4
A push lever 49 that rotates near the sliding end of 8 to release the engagement with the valve stem, and a release mechanism that releases the holding of the operation button 48 of the lock plate 49 based on the operation of the starting lever 13. Provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a nail supply mechanism in a continuous hammering type nailing machine in which multiple impacts are continuously applied to one nail by using an impact mechanism using compressed air to drive the nail into an object.

[0002]

[Prior art]

 In a general nailing machine that strikes a nail with an impact mechanism using compressed air to strike an object, a part of the compressed air that drives the impacting piston is introduced into a nail feeding cylinder to operate the impacting piston. In many cases, a nail supply mechanism that drives the nail feed piston in synchronism to automatically supply the nail to the nose part of the nailing machine is adopted.

On the other hand, there is a nailing machine in which a striking piston slidably housed in a cylinder is continuously and repeatedly driven to continuously strike a nail by a driver continuously connected to the piston. The proposal has been implemented. This type of continuous hammering machine is used for tacking concrete, etc. because of its large hammering ability. In such a continuous hammering type nail driving machine, it was not possible to adopt a mechanism for automatically supplying the nails after finishing the continuous hammering. This is because the general automatic nail feed mechanism drives the nail feed piston in synchronization with the operation of the striking piston, so if this is adopted as it is in a continuous hammering machine, the striking piston during repeated hammering will reciprocate. This is because the nail supply mechanism is activated every time. Therefore, it is common for the continuous hammering type nailing machine to employ a manually operated nail feeding mechanism.

However, recently, there is a strong demand for automatically supplying the nails in synchronization with the operation for driving the nails, in response to the demand for hammering a long nail in succession and driving it into the wood. This is because with manual nail feeding, the nail feeding must be operated by manually operating the lever for retrieving each time one nail is driven, which reduces work efficiency.

On the other hand, in the continuous hammering type nailing machine, since there is a high degree of so-called additional hammering in which nails that are insufficiently hammered are hammered again after the hammering is completed, it is also possible to select nail feeding by manual operation. preferable.

Further, when the nail can be supplied by a manual operation, there is a possibility that the supplying operation is mistakenly performed twice. If two nails are fed, the nail will be clogged, and if two nails are fed immediately before the nail driving operation, an accident or a failure may occur.

[0007]

[The purpose of the device]

 The present invention has been made in view of the above problems, and it is an object of the present invention to provide a nail supply device capable of automatically supplying a nail with the completion of driving of one nail in a continuous hammering type nailing machine. The first purpose.

Further, the present invention provides a nail supply mechanism capable of selecting the nail feeding method by switching between automatic feeding and manual feeding in order to enable additional hammering peculiar to the continuous hammering type nailing machine. The second purpose.

Further, the present invention provides a nail supply device which prevents double feed due to accidentally operating the operation lever twice during manual feed operation, thereby preventing accidents such as nail clogging and failure. The third purpose is to provide.

[0010]

[Means for achieving the purpose]

 In order to achieve the above-mentioned first object, the nail supply mechanism of the continuous hammering type nailing machine according to the present invention has a movable cylinder slidably housed in a housing, and a driver is integrally connected to the movable cylinder. A striking piston is slidably accommodated, and a nose for slidingly guiding the driver is provided below the movable cylinder, and compressed air is supplied to and discharged from the movable cylinder to continuously connect the movable cylinder and the striking piston. A head valve that controls drive and stop, a manually operable starter valve that operates the head valve, and a feed piston in a feed cylinder that is formed along a nail supply path that supplies a connecting nail into the nose. And a nail feed mechanism that is slidably arranged and that reciprocates a nail feed portion connected to the feed piston back and forth along the nail feed path. In this continuous hammering machine, the compressed air in the main chamber, which stores compressed air, is always supplied to the front end of the feed cylinder, while the start valve is connected to the rear end side of the feed cylinder. A supply switching valve section is provided to selectively connect the connected air path to the main chamber and the atmosphere, and the supply switching valve section to the feed cylinder is provided on the air path between the supply switching valve section and the rear end of the feed cylinder. It is characterized by interposing a delay mechanism that smoothes the flow of compressed air and restricts the flow of compressed air from the feed cylinder to the switching valve.

In order to achieve the above-mentioned second object, a nail supply mechanism in a continuous hammering type nailer according to the present invention has a feed cylinder on an air passage communicating a rear end of the feed cylinder and a starting valve. A switching valve that can selectively switch the air passage connected to the rear end side between the switching valve part of the start valve and the main chamber is arranged so that it can be manually operated. On the air passage, a manually operable supply valve for selectively connecting the rear end side of the feed cylinder to the switching valve and the atmosphere is arranged.

In order to achieve the above-mentioned third object, the nail supply mechanism in the continuous hammering nailer according to the present invention is slidable in the valve housing of the supply valve and is spring-biased to one side. An operation button that is arranged so as to be slidable so as to oppose one end of the valve stem, a lock plate that engages with the operation button when the operation button is operated, and locks the operation button at the sliding end position; It is rotatably attached to the tip of the operation button, and the sliding operation of the operation button pushes the valve stem against the spring, and it rotates near the sliding end of the operation button to engage with the valve stem. Is provided, and a release mechanism for releasing the lock of the operation button of the lock plate based on the operation of the start lever for manually operating the start valve.

[0013]

[Action]

 According to the above configuration, before starting the nail driver, compressed air is supplied to the front and rear ends of the feed cylinder, and the feed piston is at the front end position. When the start valve is operated, the head valve operates and the striking piston starts continuous hitting.At the same time, the supply switching valve of the start valve operates and the air passage at the rear end of the feed cylinder is opened to the atmosphere. Since the exhaust is performed from the rear end, the feed piston also retracts. The backward movement of the feed piston is performed slowly by the delay mechanism. At the retracted end, the nail feed section of the feed piston engages the connecting nail. Further, if the starting valve is released after the nail driving is completed, the continuous driving is stopped, and the feed valve switching part of the starting valve operates so that the compressed air is supplied again to the rear end of the feed cylinder. As the nail feed section moves forward, the front nail of the connecting nail is automatically supplied to the nose.

Further, the switching valve is operated so that the air passage connected to the rear end side of the feed cylinder is connected to the supply switching valve portion of the starting valve, and the supply valve is connected to the switching valve at the rear end side of the feed cylinder. If it is operated in the same manner, the nails are automatically supplied according to the operation of the start valve in the same manner as described above. On the other hand, if the air passage connected to the rear end side of the feed cylinder is switched so that it is connected to the main chamber, then the supply valve is operated so that the rear end side of the feed cylinder and the switching valve are connected. Compressed air is supplied to the front and rear ends of the cylinder, and the feed piston receives a working pressure so as to be positioned at the front end position. If the supply valve is operated so that the rear end side of the feed cylinder is connected to the atmosphere, the rear end of the feed cylinder is exhausted and the feed piston moves backward. Therefore, the nail supply mechanism can be operated by operating the supply valve regardless of the start valve.

Further, when the supply valve is operated by pressing the operation button, the push lever pushes the valve stem of the supply valve to move the feed piston backward. At the sliding end of the operation button, the push lever rotates to release the engagement with the valve stem.Therefore, if the valve stem is always urged upward, the valve stem will return to its original position. Therefore, the feed piston moves forward and the nail is supplied. When the operation button is pressed, the lock plate engages with the operation button at its sliding end, and therefore the operation button cannot be operated further. Therefore, the nail cannot be fed twice. The lock of the operation button is released by the release mechanism based on the operation of the activation lever.

[0016]

【Example】

 FIG. 13 is a vertical sectional view of a continuous hammering type nailing machine. The nailing machine accommodates a movable cylinder 2 in a housing 1 slidably, and a driving piston 4 in which a driver 3 is integrally connected to a movable cylinder 2. Is provided slidably, and a nose 5 for slidingly guiding the driver 3 is provided below the movable cylinder 2, and compressed air is supplied to and discharged from the movable cylinder 2 to move the movable cylinder 2 and the striking piston 4. Are formed along the head valve 6 for controlling continuous driving and stopping of the head valve, a manually operable start valve 7 for operating the head valve 6, and a nail supply path 8 for supplying a connecting nail into the nose 5. And a feed cylinder 10 coupled to a feed piston 10 (see FIGS. 1 to 6) slidably arranged in the feed cylinder 9 and reciprocally moved back and forth along the nail supply passage 8. From Ribe 12 Is that a that a nail supply mechanism. Then, by pulling the starting lever 13 and operating the starting valve 7, the head valve 6 is opened and actuated, and the compressed air in the main chamber (the chamber communicating with the grip 14 connected to the compressed air supply source) 15 is moved to the movable cylinder 2 The impact piston 4 is driven downward by the pressure, and the movable cylinder 2 is driven upward by the reaction, and the compressed air in the movable cylinder 2 is released to the exhaust hole 16 by the upward movement. The striking piston 4 is raised by the pressure, and at the same time, the movable cylinder 2 is lowered by the spring 17 to introduce compressed air to drive the striking piston 4 downward again. In this way, the striking piston 4 is continuously moved up and down until the head valve 6 is closed, and the nails in the nose 5 are continuously striking the striking target material.

By the way, the connecting nail a is formed by connecting a large number of nails 18 to a connecting material (plastic sheet 19 or wires), is housed in the magazine 20, and is operated between the magazine 20 and the nose 5 by the action of the nail supply mechanism. The nails are fed into the nose 5 in order from the leading nail along the nail feeding path 8 formed in the. The nail supply mechanism causes the feed piston 10 slidably accommodated in the feed cylinder 9 and the nail feed portion 12 connected to the feed piston 10 to move backward along the nail supply path 8 at the start of continuous striking of the striking piston 4. A feed claw (not shown) provided at the tip of the nail feed section 12 is engaged with the connecting nail a, and at the end of the continuous hammering, the feed piston 10 is moved forward to move the nail of the connecting nail a in the nail supply passage 8. It is sent to the nose 5 and is configured as follows in detail.

That is, as shown in FIGS. 1 and 2, the starting valve 7 is operated by operating the starting valve stem 21 from the outside to select the air passage 22 communicating with the head valve 6 as the air passage 23 communicating with the atmosphere and the main chamber 15. The operation of the head valve 6 is controlled by connecting the head valve 6 to the main chamber 15a on the peripheral surface of the valve housing 7a of the starting valve 7 at the same height as the air passage 23 communicating with the main chamber 15. One end of the air passage 24 is opened and the other end of the first air passage 24 is opened to the front end 9a of the feed cylinder 9. Therefore, the first air passage 24 is filled with the compressed air in the main chamber 15 regardless of the operation of the start valve stem 21, and is constantly supplied to the front end of the feed cylinder 9. On the other hand, in the starting valve 7, a supply switching valve portion 26 (constituted by an O-ring) that selectively connects the second air passage 25 connected to the rear end 9b side of the feed cylinder 9 to the main chamber 15 and the atmosphere. Have been provided). When compressed air is supplied to both ends of the feed cylinder 9, the feed piston 10 is biased forward by the differential pressure and is in the position shown in FIG. An air chamber 27 is formed in the first air passage 24. This is because the first air passage 24 is shorter than the second air passage 25, and therefore when the compressed air is first supplied from the compressed air supply source, the compressed air is first supplied to the front end of the feed cylinder 9. This is for preventing the feed piston 10 from being temporarily fed back by being supplied. Instead of the air chamber 27, a part of the first air passage 24 may be throttled.

Next, on the second air passage 25 between the supply switching valve portion 26 and the rear end 9 b of the feed cylinder 9, compressed air from the supply switching valve portion 26 to the rear end of the feed cylinder 9 is discharged. There is a delay mechanism 28 that smoothes the flow and restricts the flow of compressed air from the feed cylinder 9 to the supply switching valve portion 26. The delay mechanism 28 has a large-diameter through hole 30 and a small-diameter through-hole 31 formed in a lower portion of a sleeve 29 in the housing 1, and a non-return rubber valve 32 is wound around the large-diameter through-hole 30. The compressed air flows from the supply switching valve portion 26 to the rear end of the feed cylinder 9 through the large-diameter and small-diameter holes 30 and 31, and the compressed air flows in the opposite direction through the small-diameter hole. It is configured to pass 31.

According to the above configuration, before starting the nail driver, compressed air is supplied to the first air passage 24 and the second air passage 25, and the feed piston 10 of the feed cylinder 9 is at the position shown in FIG. is there. When the activation valve stem 21 is pushed in by the activation lever 13, the head valve 6 operates and the striking piston 4 starts continuous striking, as shown in FIG. 2, and the supply switching valve portion 26 of the activation valve 7 operates and the first Since the second air passage 25 is opened to the atmosphere, exhaust is performed from the rear end 9b of the feed cylinder 9. Since this exhaust is performed from the narrowed through hole 31 having a small diameter, the feed piston 10 and the driver 3 coupled to the striking piston 4 are slowly moved backward along the nail supply path 8 after a few times of repeated hammering. To do. At the retracted end, the nail feeding portion 12 engages with the connecting nail a.

After that, when the starting lever 13 is released to return the starting valve stem 21 to the original protruding position, the operation of the head valve 6 is stopped and the continuous striking of the striking piston 4 is completed, and the starting valve 7 The supply switching valve unit 26 operates so that the compressed air is supplied to the second air passage 25 again. As a result, compressed air is supplied from both ends of the feed cylinder 9, but since the pressure receiving surface of the air pressure with respect to the rear end of the feed piston 10 is larger, this differential pressure causes the feed piston 10 to move forward as shown in FIG. To do. Since the nail feeding portion 12 is engaged with the connecting nail a, the connecting nail a is moved forward by one nail as the nail feeding portion 12 advances, and the leading nail is supplied to the nose 5.

As described above, the nail feeding is automatically performed at the end of the continuous striking of the striking piston 4 (when the operation of the starting lever 13 is released). Since the nail supply mechanism is provided with the delay mechanism 30, the feed piston 10 is slowly moved backward as compared to forward. Since the feed piston 10 constitutes a wall that correctly supports the posture of the nail in the nose 5 when it is at the front end position, when the nail is struck in this state, the driving state is also good. Therefore, when the driver 3 hits the nail in the nose 5 several times to stabilize the posture of the nail and then the delay mechanism 30 retracts the nail feeding portion 12, the nail is driven in the correct posture. On the other hand, if the feed piston 10 retreats at the same time when the driver 3 starts to operate, the support of the connecting nail a in the nose 5 is lost and the stability becomes unstable. There is a risk.

Next, in order to selectively perform automatic and manual operation of the nail supply mechanism, the switching valve 35 and the supply valve 36 shown in FIGS. 3 to 6 are provided on the second air passage 25. It should be arranged so that it can be operated manually.

The switching valve 35 is arranged in the middle of the first air passage 24 and the second air passage 25 so as to be switchable from the outside, and the first air passage 24 is placed in the two O-rings 37, 38. The second air passage 25 is connected to the rear end side of the feed cylinder 9 by the central O-ring 38, and the air passages 25b and 25c of the starting valve 7 are opened. The air passage 25a communicating with the supply switching valve portion 26 and the first air passage 24 always connected to the main chamber 15 are selectively switched. When the air passages 25b, 25c on the rear end side of the feed cylinder 9 are connected to the air passage 24 (main chamber 15), the air passage leading to the supply switching valve portion 26 of the start valve 7 is disconnected, so that the start valve 7 is a feed piston. It has nothing to do with the operation control for 10.

Next, in the supply valve 36, the valve stem 40 is slidably arranged in the sleeve 29 having the same structure as the delay mechanism 28 shown in FIGS. 1 and 2, and the valve stem 40 is moved by the spring 41. The air passage 25c on the rear end side of the feed cylinder 9 is constantly urged in a direction to connect it to the air passage 25b leading to the switching valve 35, and the valve stem 40 is pushed downward against the spring 41 as shown in FIG. When operated, the second O-ring 42 from the top of the valve stem 40 closes the gap between the sleeve 29 and the valve stem 40, and the lowermost O-ring 43 is disengaged from the sleeve 29. The air passage 25c on the end side is open to the atmosphere.

According to the above configuration, when the nail supply is automatically performed, the switching valve 35 is set as shown in FIGS. 3 and 4. In this case, since the second air passage 25 communicates with the supply switching valve portion 26 of the start valve 7 and the rear end side of the feed cylinder 9, the nail supply mechanism automatically operates as in the case of FIGS. 1 and 2. To do.

On the other hand, when the nail is supplied manually, the switching valve 35 is operated to the position shown in FIGS. 5 and 6. In this case, the air passages 25b, 25c connected to the rear end 9b of the feed cylinder 9 of the second air passage 25 by the central O-ring 38 are connected to the air supply switching valve portion 26 of the starter valve 7. At the same time that the passage 25a is shut off, it is switched to connect to the first air passage 24. Therefore, when the upper end of the valve stem 40 of the supply valve 36 is pushed against the spring 41 as shown in FIG. 6, the air passage 25b communicating with the switching valve 35 is closed by the second O-ring 42 from the top of the valve stem 40. At the same time, the lowermost O-ring 43 opens the air passage 25c on the rear end side of the feed cylinder 9 to the atmosphere. Therefore, the rear end side of the feed cylinder 9 is depressurized, and the feed piston 10 moves backward. Thereafter, when the pushing force of the supply valve 36 is released, the valve stem 40 is moved upward by the spring 41, the air passages 25b and 25c connecting the switching valve 35 and the rear end side of the feed cylinder 9 are communicated, and the first Since compressed air is supplied from the main chamber 15 to the rear end 9b side of the feed cylinder 9 via the air passage 24, the feed piston 10 moves forward, and the nail feeding portion 12 supplies the connecting nail a.

As described above, since the nail supply mechanism does not interlock with the operation of the start valve 7, the operation of the nail supply mechanism can be manually switched by the switching valve 35 when performing additional hammering. Unless it is done, it is possible to prevent the nails from being supplied at the time of overdriving.

However, in the case of the above-mentioned manual operation, the nail supply mechanism has no relation to the operation of the starting valve 7. Therefore, if the nail supply mechanism is manually operated by mistake, the nail will be continuously operated. It is dangerous because the book will be sent. 7 to 9 show a mechanism for preventing such continuous nail feeding.

The double feed preventing mechanism is provided between the starting lever 13 for manually operating the supply valve 36 and the supply valve 36, is slidable in the valve housing 45 of the supply valve 36, and is operated by a spring 41. The operation button 48 arranged so as to be slidable so as to face one end of the valve stem 40 that is biased by the valve stem 40, and the operation button 48 is engaged with the operation button 48 to slide the operation button 48 when the operation button 48 is operated. A lock plate 49 that locks at the moving end position and a pivotal attachment to the tip of the operation button 48, and the valve stem 40 is pushed against the spring 41 by the sliding operation of the operation button 48 to operate. The push lever 47 is rotated near the sliding end of the button 48 to release the engagement with the valve stem 40. The lock plate 49 is operated based on the operation of the push lever 47 and the start lever 13. And a release mechanism for releasing the lock of the operation button 48.

The actuating lever 13 is slidably arranged on the nailing machine, and is composed of a finger inserting portion 13a and an operating rod portion 13b extending below the finger inserting portion 13a. The actuating lever 13 is pulled upward in the drawing. By doing so, the pressing member (not shown) connected to the lower end of the operating rod portion 13b can press and operate the valve stem 40 of the supply valve 36 together with the starting valve stem 21 of the starting valve 7. However, at the same time, the contact arm 50 (see FIG. 1), in which the lower end 50a usually projects from the tip of the nose 5 and the upper end 50b is arranged in the vicinity of the starting lever 13, becomes the material to be driven at the time of nail driving. It is configured so that it cannot be operated unless it moves relative to the nail driver by being pressed. That is, as shown in FIGS. 10, 11, and 12, the first link 51, the second link 52, and the operating piece 53 are rotatably supported by the tip of the operating rod portion 13b of the starting lever 13, The first link 51 and the second link 52 are spring-biased so as to be in a bent shape, and have a straight shape against the spring force before the operation rod portion 13b is pulled. Then, even if an attempt is made to pull the activation lever 13 in a state where the contact arm 50 is not pressed against the material to be driven, the first link 51 hits the valve housing 54 (see the dotted line in FIG. 10) and cannot be operated. Contrary to this, when the contact arm is pressed against the material to be driven and the upper end of the contact arm rotates the second link 52, the first link 51 also rotates in conjunction with this, and when the starting lever 13 is pulled in this state. The first link 51 and the second link 52 are bent, and the operating piece 53 pushes the starting valve system 21 to operate it. The pressing of the valve stem 40 of the supply valve 36 is performed in the same manner.

Two upper and lower engaging grooves 55, 56 are formed in the shaft portion 48 a of the operation button 48, and the operation button 48 is always urged upward by a spring 57. The base end of the push lever 47 is also biased by a torsion coil spring 58 against the support shaft 46 provided at the tip of the shaft portion 48a so as to always rotate clockwise in the drawing. Further, the nailing machine is formed with a guide portion 59 for guiding one side portion of the push lever 49. When the operation button 48 is not pushed, the push lever 49 is guided by the guide portion 59 so that the tip end faces the extension of the shaft portion 48a of the operation button 48 against the torsion coil spring 58, and the operation button 48 is pushed. When pushed, the push lever 49 disengages from the guide portion 59 and rotates clockwise in the vicinity of the sliding end, and its tip end moves to a position where it does not engage with the upper end of the valve stem 47 of the supply valve 36.

The lock plate 49 has an engaging hole 60 penetrating the shaft portion 48a of the operation button 48 and is arranged so as to be orthogonal to the shaft portion 48a. One end of the lock plate 49 is bent and the bent portion 49a is activated. The lever 13 is in contact with the side surface of the operating rod portion 13b. Further, the engagement hole 60 of the lock plate 49 is formed in the engagement groove 55 or the engagement groove 56 of the shaft portion 48a by the spring 62 between the bent portion 49a and the support piece 61 formed on the nailing machine. Energized to engage. When the engagement hole 60 engages with the upper engagement groove 55, this state is locked and the operation button 48 cannot be returned to the original position.

Next, in the lock releasing mechanism, the stepped portion 63 formed on the side surface of the actuating rod portion 13b of the starting lever 13 is provided with a bent portion of the lock plate 49 when the starting lever 13 slides by pulling operation. It is configured by engaging the back surface of 49a. According to this, when the step portion 63 on the side surface of the operating rod portion 13b is engaged with the bent portion 49a of the lock plate 49 when the activation lever 13 slides, as shown by the dotted line in FIG. Since the lock plate 49 is moved to the left side in the drawing against the spring 62, the engagement between the engagement hole 60 and the engagement groove 55 of the operation button 48 is released, and the operation button 48 is returned to the original position by the spring 57. It returns to the upper position and the lock is released.

According to the double feed preventing mechanism having the above-described configuration, when the operation button 48 is manually slid as shown in FIG. 8, the tip of the push lever 47 engages with the valve stem 40 of the supply valve 36. When the push lever 47 is pushed downward to operate the supply valve 36, the push lever 47 is rotated in the vicinity of its sliding end by the torsion coil spring 58 as shown in FIG. 9, so the valve stem 40 of the supply valve 36 is again shown in FIG. Thus, the spring 41 raises. The vertical movement of the valve stem 40 causes the nail supply mechanism to perform the nail supply operation. However, when the operation button 48 is operated, the engagement hole 60 of the lock plate 49 slides on the inclined guide surface 64 from the lower engagement groove 56 of the shaft portion 48a of the operation button 48, and at the sliding end thereof. It engages with the upper engagement groove 55, and this locked state is maintained. Since the operation button 48 cannot be operated again, it is possible to effectively prevent the double feed of the nails and prevent accidents and failures such as nail clogging.

However, when the activation lever 13 is operated, the release mechanism operates and the lock is released. Since the actuating lever 13 can be operated only after the contact arm actually detects the material to be driven, the releasing mechanism can be actuated only after the driving of the actuating lever 13 has finished driving the nail. After that, if the operation button 48 is pressed, the nail supply mechanism is operated, and if the start lever 13 is operated without pressing the operation button 48, the additional hammering can be performed.

[0037]

[Effect of the device]

 According to the above configuration, the nail feeding is automatically performed at the end of continuous striking of the striking piston (when the operation of the starting lever is released). Since the nail supply mechanism is provided with the delay mechanism, the feed piston is slowly moved in the backward movement as compared with the forward movement. Since the feed piston constitutes a wall that correctly supports the posture of the nail in the nose when in the front end position, when the nail is struck in this state, the driven state is also good. Therefore, when the driver hits the nail in the nose several times to stabilize the posture of the nail and then the delay mechanism causes the nail feeding portion to retract, the nail is driven in the correct posture.

Further, by operably providing the switching valve and the supply valve on the air passage that connects the rear end of the feed cylinder and the start valve, it is possible to switch between automatic operation and manual operation of the nail supply mechanism. .. In the case of manual operation, the nail supply mechanism does not operate unless the supply valve is operated, so it is possible to perform additional hammering.

Further, when the double feed prevention mechanism is provided, the operation button for activating the nail supply mechanism is locked by the lock plate once operated, and the operation button cannot be operated again. The main feed is effectively prevented, and accidents and failures such as nail clogging can be prevented. Although the lock is released by the release mechanism, it is possible to perform additional hits by operating the activation lever without operating the operation button.

[Brief description of drawings]

FIG. 1 is a sectional view showing an automatic nail supply mechanism according to the present invention.

FIG. 2 is an operation explanatory view of the automatic nail supply mechanism.

FIG. 3 is a cross-sectional explanatory view of a nail supply mechanism capable of selecting automatic or manual.

FIG. 4 is an operation explanatory view of the automatic nail supply mechanism.

FIG. 5 is an operation explanatory diagram of the above-described manual nail supply mechanism when the feed piston is advanced.

FIG. 6 is an operation explanatory diagram of the above-described manual nail supply mechanism when the feed piston is retracted.

FIG. 7 is an explanatory diagram of a nail supply mechanism provided with a double-strike prevention device.

FIG. 8 is an explanatory view of a state during operation of the double-strike prevention device.

FIG. 9 is an explanatory diagram of an operating state of the double hitting prevention device.

FIG. 10 is an explanatory diagram showing a relationship between a contact arm and a starting lever.

FIG. 11 is an explanatory diagram of an operating state when the contact arm is operated.

FIG. 12 is an explanatory diagram of an operating state when the activation lever is operated after operating the contact arm.

FIG. 13 is a schematic explanatory view of a nailing machine according to the present invention.

[Explanation of symbols]

 1 Housing 2 Movable Cylinder 3 Driver 4 Strike Piston 5 Nose 6 Head Valve 7 Starting Valve 8 Nail Supply Path 9 Feed Cylinder 10 Feed Piston 12 Nail Feeding Section 15 Main Chamber 26 Supply Switching Valve Section 28 Delay Mechanism 35 Switching Valve 36 Supply Valve 48 Operation button 49 Lock plate

Claims (3)

[Scope of utility model registration request] 1. A movable cylinder is slidably accommodated in a housing, a striking piston integrally coupled with a driver is slidably accommodated in the movable cylinder, and the driver is slidably guided below the movable cylinder. A nose for controlling the continuous drive and stop of the movable cylinder and the striking piston by supplying and exhausting compressed air to and from the movable cylinder, and a manually operable start valve for operating the head valve. And a feed piston is slidably arranged in a feed cylinder formed along a nail supply path for supplying a connecting nail into the nose,
A continuous hammering type nailing machine comprising a nail feeding mechanism in which a nail feeding section coupled with the feed piston is reciprocated back and forth along the nail feeding path, wherein compressed air is supplied to a front end of the feed cylinder. While supplying the stored compressed air in the main chamber at all times, the starting valve selectively switches the air passage connected to the rear end side of the feed cylinder to communicate with the main chamber and the atmosphere. A valve portion is provided, and on the air passage between the supply switching valve portion and the rear end of the feed cylinder, smooth flow of compressed air from the supply switching valve portion to the feed cylinder is performed, and compressed air from the feed cylinder to the switching valve portion is A nail supply mechanism for a continuous hammering type nailing machine, characterized by interposing a delay mechanism for restricting circulation. 2. An air passage connected to a rear end side of the feed cylinder is selectively provided between a switching valve portion of the start valve and the main chamber on an air passage communicating between a rear end of the feed cylinder and the start valve. A switchable switching valve is arranged so that it can be manually operated. On the air passage between the switching valve and the feed cylinder rear end, the feed cylinder rear end side is selectively connected to the switching valve and the atmosphere. 2. A nail supply mechanism for a continuous hammering type nailer according to claim 1, wherein various supply valves are arranged. 3. An operation button which is slidable in a valve housing of the supply valve and is slidably operated so as to face one end of a valve stem which is spring-biased to one side. A lock plate that engages with the operation button at the time of operation and locks the operation button at the sliding end position, and is rotatably attached to the tip of the operation button. The sliding operation of the operation button causes the valve stem to function as a spring. The push lever that is pressed against it and rotates in the vicinity of the sliding end of the operation button to release the engagement with the valve stem, and the operation of the start lever that manually operates the start valve. 3. A nail supply mechanism for a continuous hammering type nailing machine according to claim 2, further comprising a releasing mechanism for releasing the lock of the operation button.