JP2519800Y2 - Nail supply mechanism for continuous nailing machine - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] Nail feeding mechanism in a continuous hammering type nailing machine in which a nail is driven into a target object by continuously applying a large number of hammers to the nail by using an impact mechanism using compressed air. Regarding

[0002]

2. Description of the Related Art In a general nailing machine for striking a nail by an impact mechanism using compressed air to strike an object, a part of the compressed air that drives the striking piston is introduced into a nail feeding cylinder to drive the striking piston. In many cases, a nail supply mechanism that drives the nail feed piston in synchronism with the operation to automatically supply the nail to the nose portion of the nailing machine is adopted.

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

However, in recent years, there is a strong demand for automatically supplying nails in synchronism with an operation for hammering nails in response to a demand for hammering long nails in succession on wood. This is because in the manual nail feeding, the nail feeding must be operated by manually operating the lever for retrieving each time the driving of one nail is completed, and the work efficiency is reduced.

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

Further, when the nail can be manually supplied, the supplying operation may be 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]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and in a nailing machine of continuous striking type, it is possible to automatically feed the nails when the driving of one nail is completed. The first purpose is to provide.

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 and prevents accidents such as nail clogging or failure. The third purpose is to do so.

[0010]

In order to achieve the first object, a nail supply mechanism in a continuous hammering type nailing machine according to the present invention has a movable cylinder slidably accommodated in a housing,
A striking piston integrally connected with a driver is slidably accommodated in the movable cylinder, 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. Formed along a nail supply path for controlling continuous driving and stopping of the movable cylinder and the striking piston, a manually operable start valve for operating the head valve, and a nail supply path for supplying a connecting nail into the nose. A feed piston slidably disposed in the feed cylinder, and a nail feed mechanism configured to reciprocate a nail feed portion connected to the feed piston back and forth along the nail feed path. In the continuous hammering type nailing machine, the compressed air in the main chamber storing the compressed air is constantly supplied to the front end of the feed cylinder. On the other hand, the starting valve is provided with a supply switching valve section for selectively communicating the air passage connected to the rear end side of the feed cylinder with the main chamber and the atmosphere, and the supply switching valve section and the rear end of the feed cylinder. A delay mechanism for smoothing the flow of the compressed air from the supply switching valve portion to the feed cylinder and limiting the flow of the compressed air from the feed cylinder to the switching valve portion is interposed on the air passage between them. .

In order to achieve the above-mentioned second object, the nail supply mechanism in the continuous hammering type nailing machine according to the present invention has a rear end of the feed cylinder on an air passage connecting the rear end of the feed cylinder and the starting valve. A switching valve capable of selectively switching the air passage connected to the side between the switching valve portion of the starting valve and the main chamber is arranged so that it can be manually operated, and is provided on the air passage between the switching valve and the rear end of the feed cylinder. Is characterized in that 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 third object, the nail feed mechanism in the continuous hammering nailer according to the present invention is a valve that is slidable in the valve housing of the feed 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 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, and an operation button It is rotatably attached to the tip of the operation button, and the valve stem is pressed against the spring by the sliding operation of the operation button, and it is rotated near the sliding end of the operation button to release the engagement with the valve stem. 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]

According to the above construction, 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, and the supply switching valve section of the start valve operates to open the air passage at the rear end of the feed cylinder to the atmosphere, Since the exhaust is performed from the 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 portion of the feed piston engages the connecting nail. Further, when the starting valve is released after the nail driving is completed, the continuous driving is stopped, and the supply switching valve portion of the starting valve operates so that the compressed air is supplied again to the rear end of the feed cylinder. The leading nail of the connecting nail is automatically supplied to the nose because the nail feeding portion moves forward and moves at the same time.

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 start valve, and the supply valve is connected to the switching valve at the rear end side of the feed cylinder. The nail is automatically supplied according to the operation of the starting valve in the same manner as described above. On the other hand, if the supply valve is operated so that the feed cylinder rear end side and the switching valve are connected after the switching operation is performed so that the air passage connected to the feed cylinder rear end side is connected to the main chamber, 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 located 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.
The push lever rotates at the sliding end of the operation button to release the engagement with the valve stem, so 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. Then, when the operation button is pressed, the lock plate engages with the operation button at the 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 starting lever.

[0016]

EXAMPLE FIG. 13 is a vertical cross-sectional view of a continuous hammering type nailing machine. The nailing machine accommodates a movable cylinder 2 in a housing 1 slidably, and a driver 3 is integrally connected to the movable cylinder 2. A striking piston 4 is slidably accommodated, 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 form the movable cylinder 2. A head valve 6 for controlling continuous driving and stopping of the striking piston 4, a manually operable start valve 7 for operating the head valve 6 (see FIG. 1) ,
A feed cylinder 9 formed along a nail supply path 8 for supplying a connecting nail into the nose 5 and the feed cylinder 9
A feed piston 10 (see FIG. 1) slidably disposed therein.
(See FIG. 6), a nail feeding mechanism including a nail feeding portion 12 that is reciprocally moved back and forth along the nail feeding path 8 is provided. 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 transferred to the movable cylinder 2. Introduced into the upper part, the striking 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 its upward movement, and the differential pressure Causes the striking piston 4 to rise, and at the same time causes the movable cylinder 2 to descend 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), and is housed in a magazine 20. Between the magazine 20 and the nose 5 by the operation of the nail supply mechanism. The nails are supplied into the nose 5 in order from the leading nail along the nail supply path 8 formed in the. The nail supply mechanism connects the feed piston 10 slidably accommodated in the feed cylinder 9 and the nail feed portion 12 connected to the feed piston 10 to the nail supply passage 8 when the hammering piston 4 is continuously hit.
Along with the feed nail (not shown) provided at the tip of the nail feeding portion 12 to engage with the connecting nail a,
At the end of repeated hits, the feed piston 10 is moved forward to send the nail of the connecting nail a in the nail supply path 8 to the nose 5,
The details are configured as follows.

That is, as shown in FIGS. 1 and 2, the starting valve 7 operates 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 first valve 6 and the first valve 6 at the same height position as the air passage 23 communicating with the main chamber 15 on the peripheral surface of the valve housing 7a of the starting valve 7. 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 9 a of the feed cylinder 9. Therefore, the first air passage 24 is filled with 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 communicates the second air passage 25 connected to the rear end 9b side of the feed cylinder 9 with 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, so that 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 retracted by being supplied. Instead of the air chamber 27, the first air passage 24
You may narrow down a part of.

Next, on the second air passage 25 between the supply switching valve portion 26 and the rear end 9b of the feed cylinder 9,
There is a delay mechanism 28 that smoothes the flow of compressed air from the supply switching valve portion 26 to the rear end of the feed cylinder 9 and limits 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 supply switching valve unit 26
The compressed air flows from the to the rear end of the feed cylinder 9 through the large-diameter and small-diameter through holes 30 and 31, and the compressed air flows in the opposite direction through the small-diameter through hole 31.

According to the above construction, compressed air is supplied to the first air passage 24 and the second air passage 25 before the nailing machine is started, 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, and the supply switching valve portion 26 of the activation valve 7 operates as shown in FIG. 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 through the small-diameter through hole 31, the feed piston 10 and the driver 3 connected to the striking piston 4 also slowly retreat along the nail supply passage 8 after repeatedly striking a few times. . At the retracted end, the nail feeding portion 12 engages with the connecting nail a.

Thereafter, when the starting lever 13 is released to return the starting valve stem 21 to the original projecting position, the operation of the head valve 6 is stopped, the continuous striking of the striking piston 4 is completed, and the supply of the starting valve 7 is switched. The valve portion 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 for the air pressure with respect to the rear end of the feed piston 10 is larger, the differential pressure causes the feed piston 10 to move forward as shown in FIG. . Since the nail feed 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, nail feeding is automatically performed at the end of 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 28 , the operation of the feed piston 10 is slower in the backward movement than in the forward movement. 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 driven state is also good. Therefore, after the driver 3 hits the nail in the nose 5 several times to stabilize the posture of the nail, the delay mechanism 28 causes the nail feeder 12 to move.
If is retracted, the nail will be driven in the correct position. On the other hand, if the feed piston 10 retracts at the same time when the driver 3 starts operating, the support of the connecting nail a in the nose 5 is lost and becomes unstable. There is.

Next, in order to selectively perform the automatic operation and the manual operation of the above-mentioned nail supply mechanism, the nail supply mechanism shown in FIG.
The switching valve 35 and the supply valve 36 shown in FIG. 6 may be arranged so as to be manually operable.

The switching valve 35 includes a first air passage 24 and a second air passage 24.
The first air passage 24 is arranged in the middle of the air passage 25 so that the switching operation can be performed from the outside.
8 is opened to maintain a constant conduction state regardless of the switching operation, and the second air passage 25 is activated by the central O-ring 38 to activate the air passages 25b and 25c connected to the rear end side of the feed cylinder 9. The air passage 25a leading to the supply switching valve portion 26 of the valve 7 and the main chamber 1 at all times
5 is configured to be selectively switched to the first air passage 24 connected to 5. When the air passages 25b and 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 is not involved in the operation control for 10 at all.

Next, in the supply valve 36, a valve stem 40 is slidably arranged in a sleeve 29 having the same structure as the delay mechanism 28 shown in FIGS. 1 and 2, and the valve stem 40 is constantly fed by a spring 41. An air passage 25b that communicates the air passage 25c on the rear end side of the cylinder 9 with the switching valve 35.
When the valve stem 40 is pushed downward against the spring 41 as shown in FIG. 6, the second O-ring 42 from the top of the valve stem 40 causes the sleeve 29 and the valve stem to move. The lowermost O-ring 43 is closed from the sleeve 29 by closing the gap between the air passage 25 and the air passage 40, and the air passage 25c on the rear end side of the feed cylinder 9 is opened to the atmosphere.

According to the above construction, when the nail is supplied automatically, the switching valve 35 is set as shown in FIGS. In this case, since the second air passage 25 communicates with the supply switching valve portion 26 of the starting 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 positions shown in FIGS. In this case, the central O-ring 38 causes the second air passage 2
5, the air passages 25b and 25c connected to the rear end 9b side of the feed cylinder 9 are blocked from the air passage 25a connected to the supply switching valve portion 26 of the starting valve 7, and at the same time, the first air passage Switched to connect to 24. Therefore, as shown in FIG. 6, when the upper end of the valve stem 40 of the supply valve 36 is pushed against the spring 41, the second O ring 42 from the top of the valve stem 40 closes the air passage 25b communicating with the switching valve 35. 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 backwards. After that, when the pushing force of the supply valve 36 is released, the valve stem 40 is moved upward by the spring 41,
Air passages 25b and 25c connecting the switching valve 35 and the rear end side of the feed cylinder 9 are communicated with each other, and compressed air is supplied from the main chamber 15 to the rear end 9b side of the feed cylinder 9 through the first air passage 24. Therefore, 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 starting valve 7, the operation of the nail supply mechanism can be manually switched by the switching valve 35 when the additional hammering is performed, so that the supply valve 36 can be operated. 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 manual operation described above, the nail supply mechanism has nothing to do with the operation of the starting valve 7. Therefore, if the nail supply mechanism is manually operated by mistake, two nails are consecutively operated. It is dangerous because it will be sent.
7 to 9 show a mechanism for preventing such continuous nail feeding.

The preventing mechanism feeding the two is one that is provided between the operation button 48 for manually operating the supply valve 36 and the supply valve 36, and slidable within the valve housing 45 of the supply valve 36 The operation button 48, which is arranged so as to be slidable so as to face one end of the valve stem 40 which is biased to one side by the spring 41, and the operation button 4.
A lock plate 49 that engages with the operation button 48 when operating 8 and locks the operation button 48 at the sliding end position;
The valve stem 40 is rotatably attached to the tip of the operation button 48, and the sliding operation of the operation button 48 causes the valve stem 40 to be pressed against the spring 41, and the valve stem 40 is rotated near the sliding end of the operation button 48. It is composed of a push lever 47 that is released from the engagement with the stem 40, and a release mechanism that releases the lock of the operation button 48 of the lock plate 49 based on the operation of the activation lever 13.

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 extended below the finger inserting portion 13a. The actuating lever 13 is pulled upward in the drawing. As a result, a pressing member (not shown) connected to the lower end of the operating rod portion 13b is used to start the starting valve 7 of the starting valve 7.
The system 21 (see FIG. 1) can be pushed and operated, but at the same time, as shown in FIG. 13, the lower end 50 a normally projects from the tip of the nose 5 and the upper end 50.
b is a contactor arranged near the starting lever 13 .
When the nail 50 is driven, it is pressed against the material to be driven so that it cannot be operated unless it moves relative to the nail driving machine. That is, FIG. 10, FIG.
As shown in FIG. 12, the operating rod portion 13b of the starting lever 13
The first link 51, the second link 52, and the operating piece 53 at the tip of the
Are rotatably supported, and the first link 51 and the second link 52 are spring-biased so as to be bent, and the operating rod 1
Before the pulling operation of 3b, it has a straight shape against the spring force. Then, even if an attempt is made to pull and operate 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 thereof 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 Thus, the second link 52 is bent, and the operating piece 53 pushes the starting valve stem 21 to operate it .

Press the valve stem 40 of the supply valve 36
The shaft portion 48a of the operation button 48 for performing the insertion operation,
As shown in FIG. 7, upper and lower two engaging grooves 55 and 56 are formed, and the operation button 48 is always urged upward by a spring 57. The base end of the push lever 47 is also urged by a torsion coil spring 58 with respect to a 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 47 . When the operation button 48 is not pushed, the push lever 47 uses the guide portion 59 to twist the torsion coil spring 58.
Against this, the tip is guided so as to face the extension of the shaft portion 48a of the operation button 48, and when the operation button 48 is pushed in, the push lever 47 is disengaged from the guide portion 59 near the sliding end thereof and is rotated clockwise. It moves to a position where its tip does not engage with the upper end of the valve stem 40 of the supply valve 36.

The lock plate 49 is the operation button 48 described above.
Has an engaging hole 60 penetrating the shaft portion 48a of
It is arranged so as to be orthogonal to 8a, one end of which is bent, and the bent portion 49a is in contact with the side surface of the operating rod portion 13b of the starting lever 13. Further, the engagement hole 60 of the lock plate 49 is provided with the bent portion 49a and the support piece 6 formed on the nailing machine.
1 by the spring 62, the engaging groove 5 of the shaft portion 48a
5 or the engaging groove 56 is urged 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, the lock releasing mechanism has a stepped portion 63 formed on the side surface of the operating rod portion 13b of the starting lever 13.
Is engaged with the back surface of the bent portion 49a of the lock plate 49 when sliding by the pulling operation of the activation lever 13. 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. 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 upper position by the spring 57. It returns and the lock is released.

According to the double feed preventing mechanism having the above-described structure, when the operation button 48 is manually slid as shown in FIG. 8, the tip of the push lever 47 is engaged with the valve stem 40 of the supply valve 36 to move downward. When the push lever 47 is rotated near the sliding end by the torsion coil spring 58 as shown in FIG. 9, the valve stem 40 of the supply valve 36 is again springed as shown in FIG. Raise by 41. 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 has the engagement groove 5 in the lower stage of the shaft portion 48a of the operation button 48.
6 slides on the inclined guide surface 64, engages with the upper engagement groove 55 at its sliding end, 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 actuating lever 13 is operated, the unlocking mechanism is activated to unlock the lock. Since the actuating lever 13 can be operated and operated only after the contact arm actually detects the material to be driven, the releasing mechanism can be actuated only after the nailing has been completed by the operation of the actuating lever 13. After that, if the operation button 48 is pressed, the nail supply mechanism is activated, and if the start lever 13 is operated without pressing the operation button 48, the additional hammering can be performed.

[0037]

According to the above construction, the nail feeding is automatically performed at the end of the 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 operation of the feed piston is slower in the backward movement than in 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 strikes the nail in the nose several times to stabilize the posture of the nail and then the delay mechanism retracts the nail feeding portion, the nail is driven in the correct posture.

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

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. Can be 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 hitting by operating the activation lever without operating the operation button.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of 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)

(57) [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 driving and stopping of the movable cylinder and the striking piston by supplying and discharging 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,
In a continuous hammering type nailing machine comprising a nail feeding mechanism in which a nail feeding section coupled with the feed piston is reciprocally moved back and forth along the nail feeding path, compressed air is provided at 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 rear end of the feed cylinder, the rear end of the feed cylinder is selectively connected to the switching valve and the atmosphere. 2. A nail supply mechanism for a continuous hammering type nailing machine according to claim 1, wherein various supply valves are arranged. 3. An operation button which is slidable in the 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 activation lever that manually operates the activation valve. The nail supply mechanism in the continuous hammering type nailing machine according to claim 2, further comprising a releasing mechanism for releasing the lock of the operation button.