A nail gun

Abstract

The present invention provides a nail gun, belonging to the technical field of nail guns. It solves the problem that nails are easily stuck in existing nail guns. The nail gun includes a power cylinder and a nailing mechanism for controlling nailing. A piston that can move relative to the power cylinder and is used to drive steel nails out is provided in the power cylinder. The nail gun also includes a controller and a sensor electrically connected to the controller. The sensor is arranged at one end of the power cylinder near the nailing mechanism where the nail is output and is used to detect whether the piston has moved to this end. When the controller receives a detection signal generated by the sensor that the piston has not moved to this end, the controller controls the nailing mechanism not to nail. Through the above design, the nail gun can self-detect and automatically control the timing of nailing, and does not require manual judgment by the operator, which can well avoid the problem of nailing jamming caused by the overlap of two nails due to the wrong timing of nailing.

Description

Technical Field

[0001] The invention belongs to the technical field of nail guns and relates to a nail gun. Background Art

[0002] Nailers, also known as nail guns, are widely used in the decoration industry. According to the different driving sources, they can be divided into electric nail guns, pneumatic nail guns, gas nail guns, manual nail guns, etc.

[0003] For example, Chinese patent [application number: 200810084699.9] discloses an electric nail gun, including a shell with a handle and a trigger, a gun head is provided at the front end of the shell, the gun head is connected to the nail clip, the handle is provided with a trigger, a nail shooting mechanism and a control circuit controlled by the trigger are provided in the shell, a sealing plate is provided at the lower part of the trajectory in the gun head, a safety plate extending out of the gun head is provided at the front end of the sealing plate, and a miniature limit switch is provided at the rear end of the sealing plate. When the steel nail gun is in a standby state, the end of the safety plate extends out of the gun head, the micro limit switch is in a disconnected state, the ballistic bottom of the gun head and the upper nail hole of the steel nail clip are in an open state, and the steel row of nails in the steel nail clip is lifted up by the clip compression spring to enter the gun head ballistics for use; when the steel nail gun is in use, the gun head of the steel nail gun is against the hard material, the safety plate retracts into the gun head, drives the sealing plate to retreat and triggers the micro limit switch to close it, the control circuit is connected, and the sealing plate retracts into the ballistics to close the ballistic bottom and the upper nail hole, leaving only one steel nail in the ballistics, at this time, the electric steel nail gun can perform the nail shooting action by pulling the trigger. When the steel nail is completely immersed, the gun head is lifted from the striking object, the safety plate spring resets, the sealing plate pops out of the nail groove, the micro limit switch is disconnected, the line is powered off, and the electric steel gun stops working. The nailing method of the above-mentioned nail gun is: the firing pin hits the steel nail repeatedly to drive the steel nail into the striking object.

[0004] An analysis of the nailing process of the above-mentioned nail gun shows that, in the existing nail guns, the nail gun determines whether the steel nails are completely driven out, which depends entirely on the naked eye and experience of the operator. Then, when the object encountered is too hard and the steel nails are not actually driven out, the operator makes a wrong judgment at this time, lifts the gun head, the safety plate spring resets, the sealing plate pops out of the nail groove, the ballistic bottom of the gun head and the upper nail hole of the steel nail clip are in an open state, and the steel row of nails in the steel nail clip is lifted up by the clip compression spring, and a steel nail enters the gun head trajectory, while the steel nails in the trajectory are not driven out at this time, which will cause the nail gun to get stuck.

[0005] That is to say, the main reason for nail jam is that the operator's misjudgment causes the safety plate, sealing plate and other mechanical structures to control the nailing structure to have an incorrect timing. Therefore, technical personnel in this field can easily think of the conventional means to solve the above-mentioned nail jam problem: First, by setting an observation window around the trajectory, the operator can intuitively observe whether the steel nails are driven out, so as to control the timing of raising the gun to nail, thereby avoiding nailing errors and nail jam; Second, by changing the transparency of the material around the trajectory, the position of the steel nails can be observed, thereby avoiding nailing errors and nail jam. Summary of the invention

[0006] The purpose of the present invention is to solve the above problems in the prior art and to provide a nail gun. The present invention solves the problem of how to prevent the nail gun from getting stuck.

[0007] The objective of the present invention can be achieved through the following technical solutions: a nail gun, comprising a power cylinder and a nailing mechanism for controlling nailing, wherein the power cylinder is provided with a piston that can move relative to the power cylinder and is used to drive the steel nails out, characterized in that the nail gun also includes a controller and a sensor electrically connected to the controller, wherein the sensor is arranged at one end of the power cylinder close to the nailing mechanism where the nails are ejected and is used to detect whether the piston has moved to this end, and when the controller receives a detection signal generated by the sensor that the piston has not moved to this end, the controller controls the nailing mechanism not to nail.

[0008] In the prior art, when there is no previous steel nail blocking the nailing mechanism's nailing outlet, the nailing mechanism will drive the nail, but at this time the previous steel nail may not have completely left the nail gun, in order to avoid the problem of nailing being stuck due to the wrong nailing timing; Different from the prior art, the working principle of the nail gun is as follows: the nail gun is provided with a sensor at one end of the power cylinder body close to the nailing mechanism's nailing outlet. Since the end position is the limit position of the piston driving the steel nail to be driven out, that is, if the piston moves to this end position, it can be determined that the steel nail has been completely driven out. Then, when the piston does not reach this end position, the detection generated by the sensor The measured signal is that the piston is not in place. Depending on the type of sensor, the sensor may not send an electrical signal to the controller. If the controller does not receive the electrical signal, it will control the nailing mechanism not to nail; or the sensor sends an electrical signal to the controller, and the controller controls the nailing mechanism not to nail according to the type of electrical signal received; that is, when the piston does not reach the above-mentioned limit position, the nailing mechanism will not nail, so the nail gun piston will move to nail several times until the nail is completely driven out. At this time, the piston reaches the limit position, and the sensor transmits a signal to the controller, and the controller controls the nailing mechanism to start nailing and perform the next action. If the piston does not reach the limit position, the nail gun will continue to hit until the piston reaches the limit position to stop, so the nailing mechanism must be prevented from nailing. The nail gun uses sensors and controllers to automatically control the timing of not nailing, without the operator's manual judgment, thereby avoiding the problem that the previous steel nail is not completely driven out, and the next steel nail comes out, that is, two steel nails overlap, causing the nail gun to get stuck.

[0009] In the above-mentioned nail gun, the nail gun also includes a shell, the power cylinder is arranged in the shell and an installation cavity is formed between the power cylinder and the shell, and the sensor is located in the installation cavity and fixed on the outer wall of the power cylinder. Through the above design, the sensor is arranged in the installation cavity and fixed on the outer wall of the power cylinder, which can reduce the interference to the sensor and ensure the accuracy of the detection signal generated by the sensor, thereby ensuring that the controller can accurately control the timing of the nailing mechanism not to nail, thereby avoiding the problem that the previous steel nail is not completely driven out and the next steel nail is driven out, that is, the two steel nails overlap, causing the nail gun to get stuck.

[0010] In the above-mentioned nail gun, the sensor is a Hall sensor, and the piston has a magnetic conductive material. Through the Hall sensor designed as above, the sensor can work normally across the power cylinder body, and the layout is simple and reliable, so as to ensure that the controller can accurately control the timing of the nailing mechanism not to nail, thereby avoiding the problem of nail jamming in the nail gun; the specific detection principle is as follows: when the piston is in place, the magnetic conductive material in the piston will cut the magnetic field of the Hall sensor, so that the Hall sensor generates an induced current, so that the Hall sensor can transmit an electrical signal to the controller; when the piston is not in place, the Hall sensor will not generate an electrical signal, and the detection signal generated by the sensor at this time is that the piston is not in place. As an alternative, the sensor is a travel switch or an eddy current sensor. By opening a through hole in the power cylinder body, the contact head of the travel switch or the eddy current probe is extended into the power cylinder body through the through hole and sealed by a sealing structure.

[0011] In the above-mentioned nailing gun, the nailing mechanism includes a clip, a nail feeding channel for conveying steel nails is provided inside the clip, a blocking member is provided outside the clip, the blocking member is electrically connected to the controller, a through hole is provided on the clip connecting the nail feeding channel and the outside, and the blocking member can pass through the through hole into the nail feeding channel under the control of the controller and block the nail feeding operation in the nail feeding channel. When the controller receives a detection signal generated by the sensor that the piston has not moved into place, the controller controls the blocking member to pass through the through hole into the nail feeding channel, so that the blocking member will block the nail feeding operation, thereby preventing the nailing mechanism from nailing, thereby avoiding the problem that the previous steel nail is not completely driven out and the next steel nail comes out, that is, two steel nails overlap, causing the nail gun to get stuck.

[0012] In the above-mentioned nail gun, a nail pushing block and a nail feeding spring for transferring steel nails are provided in the magazine, the nail pushing block is partially or completely located in the nail feeding channel and is slidably connected to the magazine, the nail pushing block can move upward along the nail feeding channel under the action of the elastic force of the nail feeding spring, and the blocking member can pass through the perforation and abut against the nail pushing block itself or the steel nail carried by the nail pushing block. When the controller receives the detection signal generated by the sensor that the piston has not moved into place, the controller controls the blocking member to pass through the perforation and enter the nail feeding channel, at which time the blocking member abuts against the nail pushing block itself or the steel nail carried, so that the blocking member blocks the nail feeding operation under the action of the spring elastic force, thereby preventing the nailing mechanism from nailing, thereby avoiding the problem that the previous steel nail is not completely driven out and the next steel nail comes out, that is, the nailing timing is wrong and two nails overlap, causing the nailing to get stuck.

[0013] In the above-mentioned nail gun, the blocking member includes a coil electrically connected to the controller and an iron core inserted in the coil, the outer end of the iron core has a limiting flange, a reset spring is arranged between the limiting flange and the coil, and the inner end of the iron core can pass through the perforation into the nail feeding channel and press against the nail pushing block itself or the steel nail carried by the nail pushing block. When the controller receives the detection signal generated by the sensor that the piston has not moved into place, the controller controls the coil to be energized, at which time the coil generates magnetic force, and the iron core moves inward to overcome the elastic force of the reset spring under the action of the coil magnetic force, and the inner end of the iron core passes through the perforation into the nail feeding channel and presses against the nail pushing block itself or the steel nail carried, so that the blocking member blocks the nail feeding operation under the action of the spring elastic force, so that the nailing mechanism does not nail, thereby avoiding the problem that the previous steel nail is not completely driven out and the next steel nail comes out, that is, the nailing timing is wrong and two nails overlap, causing the nailing to get stuck. As an alternative, the blocking member is a micro motor electrically connected to the controller, and the motor shaft of the micro motor can pass through the magazine housing into the nail feeding channel and press against the nail pushing block itself or the carried steel nail.

[0014] As another solution, improvements have been made to the nail feeding mechanism of the existing coil nail gun, such as the nail feeding mechanism disclosed in Chinese patent document 201420014583.9. The specific solution is as follows: In the above-mentioned nail gun, the nail feeding mechanism includes a gun body, a nail feeding channel arranged on the gun body, a nail feeding claw arranged on one side of the nail feeding channel, and a driving member, the driving member can drive the nail feeding claw to move upward with the steel nails in the nail feeding channel, and the driving member is electrically connected to the controller and controlled to start and stop by the controller. When the controller receives the detection signal generated by the sensor that the piston has not moved into place, the controller controls the driving member to stop driving the nail feeding claw, so that the steel nail will not move upward and be sent out, thereby avoiding the problem that the previous steel nail is not completely driven out and the next steel nail comes out, that is, the timing of nailing is wrong and two nails overlap, causing the nailing to get stuck.

[0015] In the above-mentioned nail gun, the gun body is provided with a guide through hole which is communicated with the nail feeding channel and arranged in the vertical direction, the upper end of the guide through hole is provided with a limit bar, the nail feeding claw is located in the guide through hole and can slide along the two sides of the guide through hole, the driving member includes a telescopic rod which can be lifted and lowered, the nail feeding claw is hinged on the telescopic rod and a pressure spring is provided between the two, the pressure spring makes the nail feeding claw press against the outer surface of the limit bar, the inner side of the nail feeding claw has a slot, and the slot is partially or completely located in the nail feeding channel. When the controller receives the detection signal generated by the sensor that the piston has not moved into place, the telescopic rod of the driving member does not move, that is, the nail feeding claw does not move, and the steel nail in the nail feeding channel is stuck in the slot, so that the steel nail will not move upward and be sent out, thereby avoiding the problem that the previous steel nail is not completely driven out and the next steel nail comes out, that is, the timing of nailing is wrong and two nails overlap, causing the nailing to be stuck. When the controller receives the detection signal generated by the sensor that the piston has moved into position, the telescopic rod of the driving member moves downward, so that the nail-feeding claw swings outward while overcoming the elastic force of the top pressure spring, so that the steel nail is released from the card slot, and the nail-feeding claw continues to move downward with the telescopic rod until the nail-feeding claw is clamped on the lower steel nail in the card slot under the action of the spring elastic force; then the telescopic rod rises again, so that the steel nail moves upward to realize the nailing operation. In addition, the above-mentioned driving member is a telescopic electromagnet or a linear motor.

[0016] In the above-mentioned nail gun, when the controller receives the detection signal generated by the sensor that the piston has not moved to this end, the controller sends a control signal to continuously drive the piston to perform multiple nailing. The nail gun also includes a firing pin fixedly connected to the piston, and the firing pin can hit the steel nail delivered by the nailing mechanism under the drive of the piston. The above-mentioned piston-related driving structure can adopt the existing technical solution disclosed in patent document CN204736190U. When the controller receives the detection signal generated by the sensor that the piston has not moved to the position, that is, the previous steel nail delivered by the nailing mechanism in the trajectory of the nail gun has not been completely driven out, then the nailing mechanism at this time will not nail under the control of the controller, and at this time the controller sends a control signal to continuously drive the piston to perform multiple nailing, so that the piston can drive the firing pin to continuously hit the steel nail until the steel nail is completely driven out. At this time, the piston reaches the limit position, and the nailing mechanism starts to nail and perform the next action. Thereby avoiding the problem that the previous steel nail is not completely driven out, and the next steel nail comes out, that is, the timing of nailing is wrong and two nails overlap, causing the nailing to be stuck.

[0017] Compared with the prior art, the nail gun has the following advantages: the nail gun can self-detect and automatically control the timing of not nailing through the coordinated design of sensors, controllers and nailing mechanisms, and does not require manual judgment by the operator, which can effectively avoid the problem of nailing jamming caused by two nails overlapping due to incorrect nailing timing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the explosion of the shell of the nail gun in the first embodiment.

[0019] Figure 2 It is a schematic diagram of the nail gun in the first embodiment with the power cylinder body hidden.

[0020] Figure 3 It is a schematic diagram of the internal structure of the magazine of the nail gun in the first embodiment.

[0021] Figure 4 It is a schematic diagram of the structure of the nail gun in the second embodiment.

[0022] Figure 5 It is a partial structural exploded schematic diagram of the nail gun in the second embodiment.

[0023] Figure 6 It is a partial structural schematic diagram of the nail gun in the second embodiment.

[0024] In the figure, a, shell; b, gun body; b1, guide through hole; b2, limit strip; c, firing pin; 1, power cylinder; 2, piston; 3, controller; 4, sensor; 5, installation cavity; 6, magazine; 6a, perforation; 7, nail feeding channel; 8, blocking member; 81, shell; 82, coil; 83, iron core; 831, limit flange; 84, reset spring; 9, nail pushing block; 10, nail feeding spring; 11, nail feeding claw; 111, slot; 12, driving member; 121, telescopic rod; 13, top pressure spring. DETAILED DESCRIPTION

[0025] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0026] Embodiment 1:

[0027] Specifically, if Figure 1 and Figure 2As shown, the nail gun includes a housing a, a power cylinder 1 and a nailing mechanism for controlling nailing. The power cylinder 1 is arranged in the housing a and an inwardly recessed installation cavity 5 is formed between the power cylinder 1 and the housing a. In addition, a piston 2 is arranged in the power cylinder 1 and can move relative to the power cylinder 1 and is used to drive the steel nails to be driven out. The piston 2 is fixedly connected to the firing pin c of the nail gun. The firing pin c can strike the steel nails delivered by the nailing mechanism under the drive of the piston 2. The nail gun also includes a controller 3 and a sensor 4 electrically connected to the controller 3. The sensor 4 is located in the installation cavity 5 and is fixed on the outer wall of one end of the power cylinder 1 near the nailing mechanism. The sensor 4 is used to detect whether the piston 2 moves to the end. When the controller 3 receives the detection signal generated by the sensor 4 that the piston 2 does not move to the end, the controller 3 controls the nailing mechanism not to nail, and at this time, the controller 3 sends a control signal to continuously drive the piston 2 to perform multiple nailing. In this embodiment, the sensor 4 is a Hall sensor, and the piston 2 has a magnetic conductive material that generates an electrical signal from the Hall sensor.

[0028] More specifically, if Figure 2 and Figure 3 As shown, in this embodiment, the nail feeding mechanism includes a clip 6, and a nail feeding channel 7 for conveying steel nails, a nail pushing block 9 and a nail feeding spring 10 for moving the steel nails are provided in the clip 6, and the nail pushing block 9 is partially or completely located in the nail feeding channel 7 and is slidably connected to the clip 6. The nail pushing block 9 can move upward along the nail feeding channel 7 under the action of the elastic force of the nail feeding spring 10. A blocking member 8 is provided outside the clip 6, and the blocking member 8 is electrically connected to the controller 3. The clip 6 is provided with a through hole 6a connecting the nail feeding channel 7 and the outside world. Under the control of the controller 3, the blocking member 8 can pass through the through hole 6a to enter the nail feeding channel 7 and block the nail feeding operation in the nail feeding channel 7. Among them, the blocking member 8 includes a shell 81 fixedly connected to the clip 6, a coil 82 arranged in the shell 81 and electrically connected to the controller 3, and an iron core 83 passed through the coil 82. The outer end of the iron core 83 has a limiting flange 831, and a reset spring 84 is provided between the limiting flange 831 and the coil 82. The inner end of the iron core 83 can pass through the through hole 6a to enter the nail feeding channel 7 and press against the nail pushing block 9 itself or the steel nail carried by the nail pushing block 9.

[0029] Embodiment 2:

[0030] The technical solution in this embodiment is basically the same as that in the first embodiment, except that Figure 4 , Figure 5 and Figure 6As shown, in this embodiment, the nail feeding mechanism includes a gun body b, a nail feeding channel 7 provided on the gun body b, a nail feeding claw 11 provided on one side of the nail feeding channel 7, and a driving member 12. A movable flap is hinged on the gun body b, and the nail feeding channel 7 is formed between the gun body b and the movable flap. The driving member 12 can drive the nail feeding claw 11 to move upward along the nail feeding channel 7 with the steel nails in the nail feeding channel 7. The driving member 12 is electrically connected to the controller 3 and is controlled to start and stop by the controller 3.

[0031] More specifically, a guide hole b1 is provided on the gun body b on one side of the nail feeding channel 7, which is communicated with the nail feeding channel 7 and arranged in the vertical direction. A limit strip b2 is provided at the upper end of the guide hole b1, and the nail feeding claw 11 is located in the guide hole b1. The driving member 12 is a telescopic electromagnet, including a telescopic rod 121 that can be lifted up and down. The nail feeding claw 11 is hinged on the telescopic rod 121 and a pressure spring 13 is provided between the two. The pressure spring 13 makes the nail feeding claw 11 press against the outer side of the limit strip b2. The inner side of the nail feeding claw 11 has a card slot 111, and the card slot 111 is partially or completely located in the nail feeding channel 7.

[0032] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0033] Although this article uses more terms such as housing a, gun body b, firing pin c, guide through hole b1, limit strip b2, power cylinder 1, piston 2, controller 3, sensor 4, installation cavity 5, clip 6, perforation 6a, nail feeding channel 7, blocking member 8, shell 81, coil 82, iron core 83, limit flange 831, reset spring 84, nail pushing block 9, nail feeding spring 10, nail feeding claw 11, slot 111, driving member 12, telescopic rod 121, and top pressure spring 13, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A nail gun, comprising a power cylinder (1) and a nailing mechanism for controlling nailing, wherein a piston (2) is provided in the power cylinder (1) and can move relative to the power cylinder (1) and is used to drive the nails out, characterized in that: The nail gun further comprises a controller (3) and a sensor (4) electrically connected to the controller (3); the sensor (4) is arranged at one end of the power cylinder (1) close to the nailing mechanism's nailing outlet and is used to detect whether the piston (2) has moved to this end; when the controller (3) receives a detection signal generated by the sensor (4) indicating that the piston (2) has not moved to this end, the controller (3) controls the nailing mechanism not to nail.

2. The nail gun according to claim 1, characterized in that: The nail gun further comprises a housing (a), the power cylinder (1) being arranged in the housing (a) and forming an installation cavity (5) between the power cylinder (1) and the housing (a), and the sensor (4) being located in the installation cavity (5) and fixed on the outer wall of the power cylinder (1).

3. The nail gun according to claim 1, characterized in that: The sensor (4) is a Hall sensor, and the piston (2) contains magnetic conductive material.

4. The nail gun according to claim 1, 2 or 3, characterized in that: The nail feeding mechanism comprises a clip (6), a nail feeding channel (7) for feeding steel nails is arranged inside the clip (6), a blocking member (8) is arranged outside the clip (6), the blocking member (8) is electrically connected to the controller (3), a through hole (6a) is arranged on the clip (6) for connecting the nail feeding channel (7) and the outside, and the blocking member (8) can pass through the through hole (6a) to enter the nail feeding channel (7) under the control of the controller (3) and block the nail feeding operation in the nail feeding channel (7).

5. The nail gun according to claim 4, characterized in that: The clip (6) is provided with a nail pushing block (9) and a nail feeding spring (10) for transferring steel nails. The nail pushing block (9) is partially or completely located in the nail feeding channel (7) and is slidably connected to the clip (6). The nail pushing block (9) can move upward along the nail feeding channel (7) under the action of the elastic force of the nail feeding spring (10). The blocking member (8) can pass through the through hole (6a) and press against the nail pushing block (9) itself or the steel nail carried by the nail pushing block (9).

6. The nail gun according to claim 5, characterized in that: The blocking member (8) comprises a shell (81) fixedly connected to the clip (6), a coil (82) arranged in the shell (81) and electrically connected to the controller (3), and an iron core (83) inserted into the coil (82); the outer end of the iron core (83) has a limiting flange (831); a return spring (84) is arranged between the limiting flange (831) and the coil (82); the inner end of the iron core (83) can pass through the through hole (6a) into the nail feeding channel (7) and press against the nail pushing block (9) itself or the steel nail carried by the nail pushing block (9).

7. The nail gun according to claim 5, characterized in that: The blocking member (8) is a micro motor electrically connected to the controller (3), and the motor shaft of the micro motor can pass through the housing (a) of the clip (6) and enter the nail feeding channel (7).

8. The nail gun according to claim 1, 2 or 3, characterized in that: The nail feeding mechanism comprises a gun body (b), a nail feeding channel (7) arranged on the gun body (b), a nail feeding claw (11) arranged on one side of the nail feeding channel (7), and a driving member (12), wherein the driving member (12) can drive the nail feeding claw (11) to move the steel nails in the nail feeding channel (7) upward, and the driving member (12) is electrically connected to the controller (3) and is controlled to start and stop by the controller (3).

9. The nail gun according to claim 8, characterized in that: A guide through hole (b1) which is communicated with the nail feeding channel (7) and arranged in the vertical direction is provided on the gun body (b) on one side of the nail feeding channel (7); a limit strip (b2) is provided at the upper end of the guide through hole (b1); the nail feeding claw (11) is located in the guide through hole (b1); the driving member (12) comprises a telescopic rod (121) which can be lifted up and down; the nail feeding claw (11) is hinged on the telescopic rod (121) and a pressure spring (13) is provided between the two; the pressure spring (13) makes the nail feeding claw (11) press against the outer surface of the limit strip (b2); the inner side of the nail feeding claw (11) has a slot (111); the slot (111) is partially or completely located in the nail feeding channel (7); the driving member (12) is a telescopic electromagnet or a linear motor or a cylinder.

10. The nail gun according to claim 1, characterized in that: When the controller (3) receives a detection signal from the sensor (4) indicating that the piston (2) has not moved to the end, the controller (3) sends a control signal to continuously drive the piston (2) to perform multiple nailing operations.

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