Fastener driver

Abstract

The invention discloses a fastener driver which comprises a striking assembly and a driving assembly. The striking assembly comprises a striking piece which moves from a stopping position to a striking position so as to strike a fastener. The power mechanism comprises a gas spring mechanism for driving the striking piece; the air spring mechanism at least comprises a first air cylinder and a second air cylinder, wherein the first air cylinder comprises a first air cylinder hole for supplementing external air into the first air cylinder; the second air cylinder comprises a second air cylinder hole for releasing gas in the second air cylinder to the outside; the first cylinder communicates with the second cylinder; a first piston is arranged in the first air cylinder; and when the striking piece is located at the stop position, the air pressures on the two sides of the first piston are different. The fastener driver is more stable in operation.

Description

TECHNICAL FIELD

[0001] The present application relates to a power tool, in particular to a fastener driver. BACKGROUND

[0002] A fastener driver in the related art refers to a device capable of driving a fastener (e.g. a nail, a pin, a staple, etc.) into a workpiece. The fastener driver usually includes a striking member, and the striking member is driven to strike the fastener, so that the fastener is driven into the workpiece, and the normal operation of the striking member ensures the operation state of the whole machine.

[0003] A conventional fastener driver usually includes a nail gun, which is used to quickly drive a nail into a working surface. The nail gun usually includes a compressed air driven nail gun and a mechanical spring driven nail gun. The compressed air driven nail gun has a compressed air driven cylinder, and the thrust force generated by the cylinder is used as a driving force. The mechanical spring driven nail gun has an impact spring (compression spring), and the force of the impact spring is used as a driving force.

[0004] For the compressed air driven nail gun, a compression stroke is required to store energy in the cylinder when starting to strike, and when the stored energy reaches the required level, the energy is released to drive the striking member to strike.

[0005] This section provides background information related to the present application, which may or may not be prior art. SUMMARY

[0006] It is an object of the present application to solve or at least alleviate some or all of the above problems. To this end, it is an object of the present application to provide a fastener driver with a faster response to starting striking.

[0007] To achieve the above object, the present application adopts the following technical solution: A fastener driver includes: a striking assembly including a striking member moving from a stop position to a striking position to strike a fastener; a power mechanism including a gas spring mechanism driving the striking member; the gas spring mechanism at least includes: a first cylinder including a first cylinder hole supplementing external gas into the first cylinder; a second cylinder including a second cylinder hole releasing gas in the second cylinder to the outside; the first cylinder is in communication with the second cylinder; a first piston is arranged in the first cylinder; wherein the gas pressures on both sides of the first piston are different when the striking member is in the stop position.

[0008] In some embodiments, when the striking member is in the stop position, the first piston remains in a stationary state relative to the first cylinder.

[0009] In some embodiments, the first piston comprises a working side configured to contact the gas in the first cylinder and a communicating side exposed to the outside, when the striker is in the stop position, the gas pressure on the working side of the first piston is greater than the gas pressure on the communicating side of the first piston.

[0010] In some embodiments, the power mechanism further comprises an electric motor rotating around a motor axis to move the first piston in the first cylinder.

[0011] In some embodiments, a controller is further included to control the operation of the electric motor, the controller is configured to control the electric motor to respond to the stop signal after at least the first cylinder hole is replenished with gas from the outside to the first cylinder after receiving the stop signal.

[0012] In some embodiments, the signal generating device is configured to generate the stop signal.

[0013] In some embodiments, when the signal generating device generates the stop signal, the outside gas is replenished into the first cylinder through the first cylinder hole.

[0014] In some embodiments, when the signal generating device generates the stop signal, the first piston at least starts to compress the gas in the first cylinder.

[0015] In some embodiments, the signal generating device is arranged in the transmission path from the electric motor to the gas spring mechanism.

[0016] In some embodiments, the signal generating device is arranged in the transmission path from the gas spring mechanism to the striker.

[0017] The application has the advantage that when the striker moves to the stop position to wait for the next impact to start, the first piston compresses the gas in the first cylinder cavity in advance, resulting in different gas pressures on both sides of the first piston, so that the striker receives a pre-torque to move to the hitting position when the striker is in the stop position, so that the fastener driver starts faster. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural diagram of a fastener driver in an embodiment of the application; Figure 2 is a partial schematic diagram of the internal structure of the fastener driver in Figure 1 Figure 3 is a cross-sectional view of part of the structure of the fastener driver in Figure 1 Figure 4 is a cross-sectional view of the striker of the fastener driver in Figure 1 Figure 5 Figure 1 ​​​​Fig. 2 is a schematic view of a cross-section of the striker of the fastener driver in the parked position and the motor stopped; Figure 6 Fig. 3 is a schematic circuit diagram of the fastener driver of one embodiment of the present application; Figure 7 Fig. 4 is an exploded view of the drive assembly of one embodiment of the present application. DETAILED DESCRIPTION

[0019] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above-described accompanying drawings.

[0020] In the present application, the terms "comprise", "comprising", "including", "including", "have", "having", or any other variant thereof are intended to cover non-exclusive inclusions, so that processes, methods, articles or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed, or also include elements inherent in such processes, methods, articles or devices. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0021] In the present application, the term "and / or" is a description of the association relationship between the associated objects, which means that there can be three relationships. For example, A and / or B can represent three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents a "and / or" relationship between the associated objects.

[0022] In the present application, the terms "connection", "combination", "coupling", "mounting" can be direct connection, combination, coupling or mounting, or indirect connection, combination, coupling or mounting. Among them, for example, direct connection refers to the connection of two parts or components without the need for an intermediate part, and indirect connection refers to the connection of two parts or components with at least one intermediate part. The two parts or components are connected through the intermediate part. In addition, "connection" and "coupling" are not limited to physical or mechanical connection or coupling, and can include electrical connection or coupling.

[0023] In this application, those of ordinary skill in the art will understand that the relative terms used in connection with a quantity or a condition (for example, "about", "approximately", "substantially" and the like) include the stated value and have the meaning indicated by the context. For example, the relative terms at least include the degree of error associated with the measurement of a particular value, the tolerance caused by manufacturing, assembly, use, and the like associated with a particular value. Such terms should also be considered to disclose a range defined by the absolute values of the two endpoints. The relative terms can refer to a certain percentage (for example, 1%, 5%, 10% or more) of the indicated value plus or minus. The numerical value without the relative term should also be disclosed as a specific value with a tolerance. In addition, "substantially" when expressing the relative angular positional relationship (for example, substantially parallel, substantially perpendicular), can refer to a certain degree (for example, 1 degree, 5 degrees, 10 degrees or more) plus or minus on the basis of the indicated angle.

[0024] In this application, those of ordinary skill in the art will understand that the functions performed by the components can be performed by one component, multiple components, one part, or multiple parts. Similarly, the functions performed by the parts can also be performed by one part, one component, or multiple parts in combination.

[0025] In this application, the terms "up", "down", "left", "right", "front", "back" and the like are described in the orientation and positional relationship shown in the drawings, and should not be understood as limiting the embodiments of the application. In addition, it is also understood in the context that when referring to one element connected to another element "up" or "down", it can not only be directly connected to another element "up" or "down", but also indirectly connected to another element "up" or "down" through an intermediate element. It should also be understood that the terms "up", "down", "left", "right", "front", "back" and the like not only represent the positive direction, but also can be understood as the side direction. For example, the lower side can include the directly below, the left below, the right below, the front below and the back below, etc.

[0026] In this application, the terms "controller", "processor", "central processing unit", "CPU", "MCU" can be interchangeable. When a single unit "controller", "processor", "central processing unit", "CPU" or "MCU" is used to perform a specific function, unless otherwise specified, these functions can be performed by a single unit or multiple units.

[0027] In this application, the terms "device", "module" or "unit" can be realized by hardware or software to achieve a specific function.

[0028] In this application, the terms "calculate", "determine", "control", "determine", "identify" and the like refer to the operation and process of a computer system or similar electronic computing device (for example, controller, processor and the like).

[0029] As Figure 1 A fastener driver 100 of one embodiment of the present application is shown. The fastener driver 100 is used to drive a fastener into a work surface 200. For example, the fastener can be a nail, which can be a straight nail or a U-shaped nail. The fastener driver 100 drives the fastener into the work surface 200 quickly so as to secure the work surface 200 to a platform behind the work surface 200. In this embodiment, the fastener driver 100 is, for example, a nail gun. Alternatively, the fastener driver 100 includes a mechanical spring-type nail gun that uses the force of a compressed coil spring as an impact force (e.g., a driving force). Alternatively, the fastener driver 100 is a gas cylinder-type nail gun that uses gas in a compressed gas cylinder to propel the fastener.

[0030] In this embodiment, the fastener driver 100 is a gas cylinder-type nail gun. For example, the gas cylinder assembly of the fastener driver 100 is in communication with the atmosphere, and gas flows into the gas cylinder in a predetermined state.

[0031] As Figure 1 shown, the fastener driver 100 uses a rechargeable battery pack as a power source. In this embodiment, the battery pack is a battery pack 300 that cooperates with a corresponding power circuit to provide power to the fastener driver 100. Those skilled in the art will appreciate that in other embodiments, the fastener driver 100 can be powered by other power sources, such as an AC power cord that is connected to a power outlet, or other connection cables that can be connected to a power supply device. The power outlet or other power supply device cooperates with a corresponding rectification, filtering, and voltage regulation circuit to provide power to the corresponding components of the fastener driver 100. Hereinafter, the battery pack 300 will be used to replace the power source, but this should not be construed as a limitation of the present application.

[0032] As Figures 1 to 3 shown, the fastener driver 100 includes a housing 11, a striking assembly 12, and a power mechanism 20. The housing 11 is used to support the striking assembly 12 and the power mechanism 20. The striking assembly 12 includes a striking member 121 that drives the fastener, and the striking member 121 is used to drive the fastener into the work surface 200 along a striking straight line 101. The striking member 121 is a sheet-like element that extends along a plane parallel to the striking straight line 101, and the striking member 121 defines an axis that coincides with the striking straight line 101. The power mechanism 20 is used to drive the striking member 121 to move along the striking straight line 101 so as to impact the fastener into the work surface 200 along the striking straight line 101.

[0033] In the present embodiment, the striker 121 comprises a rest position, i.e. the top dead center, and a striking position, i.e. the bottom dead center. For example, the power mechanism 20 drives the striker 121 to move from the rest position to the striking position to strike the fastener, and after striking the fastener, the striker 121 is driven to return from the striking position to the rest position to complete one strike. That is, normally, when the striker 121 moves from the rest position to the striking position, the fastener is driven to be shot into the working surface 200 along the striking straight line 101. Then the striker 121 returns from the striking position to the initial rest position to wait for the next strike.

[0034] For the convenience of describing the technical solutions of the present application, the front-rear direction and the up-down direction are defined as shown in the drawings, wherein the front-rear direction is parallel to the striking straight line 101, and the direction in which the striker 121 points to the fastener is the front, and the up-down direction is perpendicular to the front-rear direction. Figure 1

[0035] In the present embodiment, the power mechanism 20 further comprises a motor 14. The motor 14 is arranged in the housing 11, and the motor 14 is used to provide power. In the present embodiment, the motor 14 is specifically an electric motor 14, and the power is provided by the electric motor 14. The electric motor 14 rotates around the motor axis 104 to generate a force for driving the striker 121 to move from the striking position to the rest position. It can be understood that in other embodiments, the motor 14 can also be other forms of power sources, such as an engine. In the present application, for the convenience of description, the electric motor 14 is described. The electric motor 14 is an internal rotor electric motor 14, which comprises a stator assembly 142 and a rotor assembly 143, the rotor assembly 143 comprises a motor shaft 141 for outputting power, and the stator assembly 142 surrounds the motor shaft 141. The motor shaft 141 can rotate around the motor axis 104 relative to the housing 11 to output power. It can be understood that in other embodiments, the electric motor 14 can also be an external rotor electric motor. A battery pack 300 is detachably mounted to the housing 11. When the battery pack 300 is mounted to the housing 11, the battery pack 300 can at least power the electric motor 14 to operate.

[0036] The power mechanism 20 comprises a driving assembly 21, a gas spring mechanism 22, and a firing assembly 23. The driving assembly 21 is used to drive the gas spring mechanism 22 to store energy. The firing assembly 23 forms or connects the striker 121, and the firing assembly 23 is arranged to be movable along the third straight line 103 relative to the housing 11 and to drive the striker 121 to move along the striking straight line 101 when moving along the third straight line 103.

[0037] The gas spring mechanism 22 stores energy for driving the firing assembly 23 to move, and drives the firing assembly 23 to move along the third straight line 103 when releasing the energy, thereby driving the striker 121 to move along the striking straight line 101.

[0038] ​The fastener driver 100 further includes a speed reduction mechanism 15 disposed between the motor 14 and the power mechanism 20, which connects the motor 14 and the power mechanism 20 so as to transmit the power outputted by the motor 14 to the power mechanism 20. The speed reduction mechanism 15 also causes the rotational speed of the motor 14 to be reduced for output. In the present embodiment, the speed reduction mechanism 15 includes a first speed reduction assembly 151, which adopts planetary gear reduction. Since the working principle of the speed reduction of the planetary gear set and the speed reduction generated by such a transmission mechanism have been fully disclosed to those skilled in the art, detailed description is omitted here for the purpose of brevity of the specification.

[0039] As shown in Figures 1-5 , the gas spring mechanism 22 includes a gas cylinder 22a. The firing assembly 23 is at least partially disposed in the gas cylinder 22a. The gas cylinder 22a includes at least a first gas cylinder 221. The first gas cylinder 221 is provided with gas, and the firing assembly 23 includes at least a first piston 231 that moves in the first gas cylinder 221 to compress the gas in the first gas cylinder 221 to store energy. Part or all of the first piston 231 is disposed in a first gas cylinder cavity 2210. The first gas cylinder 221 includes the first gas cylinder cavity 2210, and the central axis of the first gas cylinder cavity 2210 is arranged as a second straight line 102.

[0040] In the present embodiment, the first piston 231 includes a working side 231a that contacts the gas in the first gas cylinder 221 and a communication side 231b exposed to the outside. The working side 231a of the first piston 231 is in the first gas cylinder cavity 2210. The first gas cylinder cavity 2210 is at least partially formed by the inner side wall of the first gas cylinder 221 and the side wall of the working side 231a of the first piston 231. The surface of the first gas cylinder 221 can be provided with a first gas cylinder hole 2214, which replenishes the gas in the first gas cylinder 221 under predetermined conditions.

[0041] As shown in Figures 3-5 , the gas cylinder 22a further includes a second gas cylinder 222. Part or all of the second gas cylinder 222 is disposed in the first gas cylinder 221. Part or all of the second gas cylinder 222 is disposed in the first gas cylinder cavity 2210. The second gas cylinder 222 includes a second gas cylinder cavity 2220, and the central axis of the second gas cylinder cavity 2220 coincides with a third straight line 103. In the present embodiment, the second straight line 102 is parallel to but does not coincide with the third straight line 103. In some embodiments, the second straight line 102 coincides with the third straight line 103. In some embodiments, the second straight line 102 is arranged at an angle with the third straight line 103.

[0042] In some embodiments, the gas spring mechanism 22 further includes a connecting part 223 for connecting the first cylinder chamber 2210 and the second cylinder chamber 2220, so that the gas in the first cylinder chamber 2210 can enter the second cylinder chamber 2220 through the connecting part 223.

[0043] The firing assembly 23 also includes a second piston 232. The second piston 232 is disposed within the second cylinder chamber 2220. The striking member 121 and the second piston 232 are fixedly connected, and the second piston 232 drives the striking member 121 to reciprocate between the top dead center or stop position and the bottom dead center or striking position within the second cylinder chamber 2220.

[0044] The surface of the second cylinder 222 is provided with a second cylinder bore 2221. When the striking member 121 is in the striking position, the second cylinder bore 2221 releases part of the gas in the second cylinder cavity 2220 to the outside. After the impact fastener is completed, the second piston 232 moves forward under the push of air pressure until it passes the second cylinder bore 2221, at which point the gas can leave the second cylinder cavity 2220 and be released to the outside through the second cylinder bore 2221.

[0045] In this embodiment, the striking member 121 moves from the upper dead center or stop position to the lower dead center or striking position under the action of air pressure, thereby pushing the striking member 121 forward to strike the fastener. Figure 5 As shown, after the striking member 121 moves forward to strike the fastener, the second piston 232 drives the striking member 121 to the stop position. At this time, the air pressure on both sides of the first piston is different. In this embodiment, when the striking member 121 moves to the stop position, the motor 14 responds to the stop signal and stops moving under set conditions. Consequently, the first piston 231 remains stationary relative to the first cylinder 221. The air pressure on the working side 231a of the first piston 231 is not equal to the external atmospheric pressure, and the air pressure on the working side 231a of the first piston 231 is greater than the air pressure on the connecting side 231b of the first piston 231. In this embodiment, when the striking member 121 moves to the stop position to wait for the next impact start, the first piston 231 compresses the gas in the first cylinder cavity 2210 in advance, resulting in a difference in air pressure on both sides of the first piston 231, so that the striking member 121 is subjected to a pre-force to move towards the striking position when it is in the stop position. Compared to related technologies, where the pressure on both sides of the first piston is balanced when the striking member is in the stopped position, the fastener driver in this embodiment has a faster start-up response speed.

[0046] In the present embodiment, the working side 231a of the first piston is defined as the side of the first piston that can form a sealed cavity or a sealed space with the cylinder. In the present embodiment, the first piston is connected to the inner wall of the first cylinder and the outer wall of the second cylinder respectively. To generate compression force for compressing the gas in the first cylinder, the first piston is connected to the inner wall of the first cylinder and the outer wall of the second cylinder respectively by a sealing member. The face passing through the sealing member is defined as the boundary surface A-A, and the side closer to the top dead center among the two sides of the boundary surface is the working side 231a. Alternatively, the side located at the rear side of the boundary surface among the two sides of the boundary surface is the working side 231a. Alternatively, the side closer to the bottom of the first cylinder among the two sides of the boundary surface is the working side 231a. The boundary surface A-A is not limited to a plane, for example, in the present embodiment, the first piston includes a first sealing member 2311 connected to the inner wall of the first cylinder and a second sealing member 2312 connected to the outer wall of the second cylinder, and the first sealing member 2311 and the second sealing member 2312 are arranged in front of and behind each other along the second straight line 102. The boundary surface A-A is composed of the faces passing through the first sealing member 2311 and the second sealing member 2312 respectively. In some embodiments, when the sealing member of the first piston is a single sealing member or the first sealing member 2311 and the second sealing member 2312 are arranged in front of and behind each other along the second straight line 102, the boundary surface A-A is a plane perpendicular to the second straight line 102. The communication side 231b of the first piston 231 is the other side of the boundary surface A-A. It can be understood that the communication side 231b of the first piston 231 is the open side of the first cylinder.

[0047] In the present embodiment, the drive assembly 21 is connected to the first piston 231, and when the motor 14 rotates around the motor axis 104, the drive assembly 21 drives the first piston 231 to reciprocate in the direction of the second straight line 102 within the first cylinder cavity 2210. In the present embodiment, the drive assembly 21 is connected to the communication side 231b of the first piston 231.

[0048] As Figure 7As shown, the drive assembly 21 includes a crank 211, a connecting shaft 212 and a drive rod 213. The motor 14 is connected to the output shaft 1511 through the speed reducer 15, and the output shaft 1511 drives the crank 211 to rotate. The connecting shaft 212 on the crank 211 drives the drive rod 213 to reciprocate along the second straight line 102, and the drive rod 213 drives the first piston 231 to reciprocate along the direction of the second straight line 102. The drive rod 213 is connected to the communication side 231b of the first piston 231. In this embodiment, when the motor 14 rotates around the motor axis 104, the axis of the output shaft 1511 is coaxial with the motor axis 104. The crank 211 is provided with two eccentric shaft holes. The first shaft hole 2111 is coaxially connected with the output shaft 1511, and the second shaft hole 2112 is eccentrically arranged with the first shaft hole 2111 and coaxially connected with the connecting shaft 212. That is, the output shaft 1511 is eccentrically arranged with the connecting shaft 212, so as to convert the rotation of the motor 14 around the motor axis 104 into the reciprocating motion of the first piston 231 along the second axis 102 perpendicular to the motor axis 104. The operating state of the motor 14 affects the position of the first piston 231 relative to the shell 11.

[0049] In some embodiments, the firing assembly 23 further includes an iron sheet 234 and a magnet 235. The iron sheet 234 is arranged on the side of the second piston 232 facing the communication part 223, and the magnet 235 is arranged on the side of the communication part 223 facing the second piston 232. The iron sheet 234 and the magnet 235 attract each other to keep the position of the second piston 232, and at this time the striker 121 is in the stop position. In other embodiments, the magnet 235 can be arranged on the side of the second piston 232 facing the communication part 223, and the iron sheet 234 can be arranged on the side of the communication part 223 facing the second piston 232.

[0050] The embodiment provides an implementation of a power mechanism 20. When the user starts the motor 14, the motor shaft 141 starts to rotate around the motor axis 104, and the drive assembly 21 drives the first piston 231 to move from front to back in the first cylinder 221 along the direction of the second straight line 102. The gas in the first cylinder cavity 2210 enters the second cylinder cavity 2220 through the communication part 223. As the first piston 231 gradually moves close to the communication part 223, the compression stroke of the gas in the first cylinder cavity 2210 becomes larger, and the gas pressure borne by the second piston 232 also gradually increases. When the gas pressure borne by the second piston 232 reaches a predetermined threshold, the second piston 232 is separated from the attraction of the magnet 235, and the striker moves from the top dead center, also called the stop position, to the bottom dead center, also called the hitting position, under the action of the gas pressure, thereby driving the striker 121 to move forward and impact the fastener. Figure 4As shown, the second piston 232 is at the bottom dead center, also called the hitting position. After the hitting is completed, when the second piston 232 is pushed forward by the gas pressure to pass the second cylinder hole 2221, the gas can exit the second cylinder cavity 2220 through the second cylinder hole 2221.

[0051] After the hitting member 121 is moved forward to hit the fastener, the first piston 231 can be moved from back to front by the driving rod 213, while the second piston 232 is moved from front to back by the gas pressure, until the first piston 231 is moved to the front end by the driving rod 213, and the second piston 232 moves the hitting member 121 to the stop position, and the magnet 235 and the iron sheet 234 attract each other to keep the second piston 232 and the hitting member 121 in the stop position. As shown, Figure 3 and Figure 5 As shown, the second piston 232 is at the top dead center, also called the stop position.

[0052] When the second piston 232 moves the hitting member 121 to the stop position or in the process of moving the hitting member 121 to the stop position, the first piston 231 passes the first cylinder hole 2214, so that the first cylinder hole 2214 is located on the working side 231a of the first piston 231, and at least part of the first cylinder hole 2214 is located in the first cylinder cavity 2210, thereby supplementing the gas in the first cylinder 221, as shown. Figure 3 The specific gas supplementing process is described in detail in the subsequent text.

[0053] In this embodiment, since the second cylinder 222 is partially arranged in the first cylinder 221, part of the outer side wall of the second cylinder forms the side wall of the first cylinder 221. In this embodiment, at least part of the first cylinder hole 2214 is formed on the part of the outer wall of the second cylinder 222 which constitutes the first cylinder cavity 2210. When the first piston 231 moves forward to pass the first cylinder hole 2214 or the gas inlet passage (not shown) arranged on the first piston 231 is communicated with the first cylinder hole 2214, the external gas can enter the first cylinder cavity 2210 through the first cylinder hole 2214, that is, the external gas can enter the working side 231a of the first piston through the first cylinder hole 2214.

[0054] As shown, Figure 5As shown, after the air supplement is completed, the first piston 231 is moved forward in the first cylinder cavity 2210 under the pushing of the driving rod 213 to cross the first cylinder hole 2214 to form a sealing state again in the first cylinder cavity 2210, and the first piston 231 compresses the gas in the first cylinder cavity 2210. At this time, the gas in the first cylinder cavity 2210 includes the gas entering from the first cylinder hole 2214. Due to the compression of the first piston 231 to the gas, the gas pressures on both sides of the first piston 231 are different, so that the gas pressure on the working side 231a of the first piston 231 is greater than the atmospheric pressure outside, that is, greater than the gas pressure on the connecting side 231b, and at the same time, the gas pressure on the working side 231a of the first piston 231 is less than a predetermined threshold value when the second piston 232 is separated from the attraction of the magnet 235, thereby ensuring that the striker 121 can still remain in the stop position after being subjected to the pre-pressure applied by the first piston 231. When the gas pressure value on the working side 231a of the first piston 231 meets the pre-pressure threshold value, the motor is stopped, and the first piston 231 remains relatively stationary with the first cylinder 221.

[0055] When the motor is started again, the first piston 231 is moved forward in the first cylinder cavity 2210 under the pushing of the driving rod 213 to continue to compress the gas in the first cylinder cavity 2210, and the gas pressure generated by the compression of the gas pushes the second piston 232 until the second piston 232 is separated from the attraction of the magnet 235. The second piston 232 is moved from back to front, pushing the striker 121 to move forward to the hitting position and then impacting the nail. Through the above cycle, the fastening driver can continuously shoot the nails.

[0056] In the embodiment, the power mechanism further includes a reverse prevention assembly to ensure that when the gas pressures on both sides of the first piston 231 are unbalanced, the motor 14 is stopped and the first piston 231 can remain stationary. The reverse prevention assembly prevents the first piston 231 from driving the driving rod 213 to move. Illustratively, the reverse prevention assembly further includes a shaft lock assembly (not shown in the figure) that transmits power to the output shaft 1511. Among them, the shaft lock assembly allows power to be transmitted from the motor 14 to the output shaft 1511, and prevents power from being reversely transmitted from the output shaft 1511 to the motor 14. The structure of the shaft lock assembly belongs to a relatively common technology, which will not be described here. Illustratively, the reverse prevention assembly is arranged between the driving assembly 21 and the output shaft 1511, and the reverse prevention assembly includes a one-way bearing to allow power to be transmitted from the output shaft 1511 to the driving assembly 21, and to prevent power from being reversely transmitted from the driving assembly 21 to the output shaft 1511. It can be understood that the reverse prevention assembly can also include other one-way transmission components, as long as the structure of the one-way transmission of power from the first piston 231 to the motor shaft 141 can be achieved, which is a protection example of the reverse prevention assembly of the present application.

[0057] In this embodiment, the movement of the first piston 231 is driven by the rotation of the motor 14, and the stopping position of the first piston 231 is related to the stopping position or stopping time of the motor 14. Figure 5 As shown, when the motor shaft 141 of the motor 14 stops rotating, the first piston 231 stops moving. In this embodiment, as... Figure 6 As shown, motor 14 is a three-phase brushless motor. Fastener driver 100 includes control circuitry 17 for controlling the operation of motor 14. Exemplarily, control circuitry 17 includes drive circuitry 171 and controller 172. Controller 172 can at least control the operation of motor 14 or limit the output of motor 14. Limiting the output of motor 14 includes deceleration and stopping. Motor deceleration refers to a reduction in the output speed of motor 14, and motor stopping refers to motor 14 ceasing operation and no longer outputting power. The stopping method of motor 14 can be a complete shutdown or intermittent shutdown.

[0058] The controller 172 is mounted on the control circuit board 17a, which includes a printed circuit board (PCB) and a flexible printed circuit board (FPC). The controller 172 uses a dedicated control chip, such as a microcontroller or microcontroller unit (MCU).

[0059] In this embodiment, the controller 172 is configured to respond to the stop signal after receiving it, at least after replenishing gas to the first cylinder 221 from the outside via the first cylinder bore 2214. That is, the controller 172 does not necessarily respond immediately to the stop signal to stop the motor 14 upon receiving it. In this embodiment, the control circuit 17 also includes a signal generating device 18, which generates a motor stop signal. The signal generating device 18 generates the motor stop signal when the striking member 121 is in the stop position.

[0060] In some embodiments, the signal generating device 18 is disposed in the transmission path from the motor 14 to the air spring mechanism 22. For example, the signal generating device 18 is disposed on the drive assembly 21, such as on the drive rod 213. The position of the drive rod 213 is detected to determine the position of the striking member 121 in the rest position. For example, the signal generating device 18 is disposed in the speed reduction mechanism 15. In some embodiments, the signal generating device 18 is disposed in the transmission path from the air spring mechanism 22 to the striking member 121. For example, the signal generating device 18 is disposed on the striking member 121 or senses the position of the striking member. For example, the signal generating device 18 is disposed on the air cylinder 22a or the firing assembly 23, and the position of the piston is sensed or detected to determine the position of the striking member in the rest position. The signal generating device 18 includes one or more of an infrared sensor, a Hall sensor, a photoelectric sensor, or a camera.

[0061] In some embodiments, when the signal generating device 18 generates the stop signal, the controller 172 controls the motor 14 to continue to rotate according to the preset condition, and then the motor 14 responds to the stop signal to enter the stop operation mode. It should be noted that the stop operation mode is a pre-set operation mode, and the stop operation mode can be any one of direct stop, stop after completing the brake operation, or stop after completing a preset fixed rotation parameter. For example, when the signal generating device 18 generates the stop signal, the striking member 121 is located in the rest position, and the first piston 321 moves to a position where the first cylinder hole 2214 is in communication with the first cylinder cavity 2210 to allow the first cylinder hole 2214 to supplement gas from the outside to the first cylinder cavity 2210. The controller 172 controls the motor 14 to continue to rotate, and the first piston 231 starts to move to pass through the first cylinder hole 2214, so that the first cylinder hole 2214 is located on the communication side 231b of the first piston 231, and the first cylinder cavity 2210 is sealed again. The first piston 231 starts to compress the gas in the first cylinder cavity 2210. In this embodiment, when the signal generating device 18 generates the stop signal, the controller 172 controls the number of rotations of the motor 14, and when the number of rotations of the motor 14 reaches a preset value, the pressure generated by the compression stroke of the first piston 231 on the gas in the first cylinder cavity satisfies the pre-pressure threshold. In some embodiments, when the signal generating device 18 generates the stop signal, the controller 172 can also control at least one of the rotation time of the motor 14 or the rotation angle of the motor shaft 141.

[0062] To ensure that the first cylinder bore 2214 can supplement enough gas into the first cylinder, the controller controls the motor to rotate at a low speed to give the first cylinder bore enough time to supplement gas into the first cylinder after receiving the stop signal. For example, the speed of the motor after the signal generating device 18 sends the stop signal is less than or equal to one sixth of the speed of the motor before the signal generating device 18 sends the stop signal. For example, when the striker 121 is in the stop position, the motor is stopped, and the motor, or any component of the speed reduction mechanism 15 or the drive assembly 21 has a theoretical gas supplement angle in the case of supplementing gas into the first cylinder 221 through the first cylinder bore 2214. For example, the drive wheel 1411 on the motor shaft 141 has a theoretical gas supplement angle and a gas supplement time. When the first cylinder bore 2214 needs to supplement gas during the operation of the motor, the rotation angle speed of the drive wheel is less than or equal to the theoretical gas supplement angle / theoretical gas supplement time. When the first cylinder bore 2214 needs to supplement gas during the operation of the motor, the rotation speed of the motor is less than or equal to the theoretical gas supplement angle / 360*theoretical gas supplement time / theoretical gas supplement time.

[0063] In other alternative embodiments, when the signal generating device 18 sends the stop signal, the first piston 231 at least starts to compress the gas in the first cylinder 221. For example, when the signal generating device 18 sends the stop signal, the first piston 231 has passed the first cylinder bore 2214, and the external supplement gas has entered the first cylinder cavity 2210 from the first cylinder bore 2214, so that the motor 14 can directly respond to the stop signal and enter the stop working mode after the signal generating device 18 sends the stop signal. Optionally, when the striker 121 moves to the stop position, the first piston 231 has passed the first cylinder bore 2214, that is, during the movement of the striker 121 to the stop position, the first cylinder bore 2214 is in communication with the first cylinder cavity 2210, and when the striker 121 moves to the stop position, the first cylinder bore 2214 is located on the communication side 231b of the first piston 231. Optionally, when the striker 121 moves to the stop position, the first cylinder bore 2214 is in communication with the first cylinder cavity, and the signal generating device 18 does not send the stop signal when the striker 121 moves to the stop position, but sends the stop signal after the striker 121 moves to the stop position and stays in the stop position for a certain period of time.

[0064] It should be noted that the communication between the first cylinder bore 2214 and the first cylinder cavity 2210 includes, for example, that the first piston 231 has no overlapping part with the first cylinder bore 2214, that is, the first cylinder bore 2214 is not blocked by the first piston 231 at all. Or for example, the second sealing ring 2312 on the first piston 231 is closer to the front part of the first cylinder bore 2214, so that the more the first cylinder bore 2214 is located in the movement stroke of the first piston 231, the more the intake amount is.

[0065] In some embodiments, such as Figure 6 As shown, motor 14 includes a rotor with permanent magnets and electronically commutated three-phase stator windings U, V, and W. In some embodiments, the three-phase stator windings U, V, and W are star-connected, and in other embodiments, they are delta-connected. However, it must be understood that other types of brushless motors are also within the scope of this disclosure. Brushless motors may include fewer or more than three phases.

[0066] The drive circuit 171 is electrically connected to the stator windings U, V, and W of the motor 14, and is used to transfer current from the battery pack 300 to the stator windings U, V, and W to drive the motor 14 to rotate. In one embodiment, the drive circuit 171 includes a plurality of switching elements Q1, Q2, Q3, Q4, Q5, and Q6. The gate terminal of each switching element is electrically connected to the controller 172 to receive a control signal from the controller 172. The drain or source terminal of each switching element is connected to the stator windings U, V, and W of the motor 14. The switching elements Q1-Q6 receive the control signal from the controller 172 and change their respective conduction states, thereby changing the current applied by the battery pack 300 to the stator windings U, V, and W of the motor 14. In one embodiment, the drive circuit 171 may be a three-phase bridge driver circuit comprising six controllable semiconductor power devices (e.g., field-effect transistors (FETs), bipolar junction transistors (BJTs), insulated-gate bipolar transistors (IGBTs), etc.). It is understood that the aforementioned switching elements may also be any other type of solid-state switch, such as IGBTs, BJTs, etc.

[0067] In this embodiment, the controller 172 specifically controls the on / off state of the switching element in the drive circuit 171 through a control chip. In some embodiments, the controller 172 controls the ratio between the on and off times of the drive switch based on a pulse width modulation (PWM) signal. It should be noted that the control chip can be integrated into the controller 172, or it can be set independently of the controller 172. The structural relationship between the drive chip and the controller 172 can be set according to the actual situation.

[0068] like Figures 1 to 3As shown, the fastener driver 100 further comprises a magazine assembly 191 disposed at the front end of the housing 11, the magazine assembly 191 being configured to hold fasteners and to connect to the firing assembly 23, the magazine assembly 191 being configured to push the fasteners one by one into the striking assembly 12.

[0069] The housing 11 comprises a main body portion 111, a motor housing portion 113 and a handle portion 112. The main body portion 111 is formed with a first receiving cavity for receiving at least part of the gas spring mechanism 22. The motor housing portion 113 houses the motor 14. The handle portion 112 is configured to be held by a user to operate the fastener driver 100. The motor housing portion 113 and the handle portion 112 extend downwardly from a lower portion of the main body portion 111. The motor housing portion 113 extends forwardly and the handle portion 112 extends rearwardly, substantially parallel to each other.

[0070] The housing 11 further comprises a coupling portion 115 for coupling to the battery pack 300, the battery pack 300 being removably coupled to the coupling portion 115. The coupling portion 115 is disposed across the motor housing portion 113 and the distal end of the handle portion 112. Alternatively, the coupling portion 115 is disposed at the end of the handle portion 112 distal to the main body portion 111. The battery pack 300 is configured to be coupled to the coupling portion 115 in a direction transverse to the direction of the third straight line 103. In some embodiments, the battery pack 300 is configured to be coupled to the coupling portion 115 in a direction parallel to the third straight line 103.

[0071] A through hole 114 is formed between the motor housing portion 113 and the handle portion 112 for a user's hand to pass through. In the present embodiment, the main body portion 111 connects the handle portion 112 and the motor housing portion 113 at the upper side of the handle portion 112 and the motor housing portion 113, and the coupling portion 115 connects the handle portion 112 and the motor housing portion 113 at the lower side of the handle portion 112 and the motor housing portion 113. In this way, the main body portion 111, the motor housing portion 113, the coupling portion 115 and the handle portion 112 are connected in sequence to form the through hole 114. It will be appreciated that in other embodiments, the coupling portion 115 can not connect the handle portion 112 and the motor housing portion 113, and the through hole 114 is then the region between the handle portion 112 and the motor housing portion 113. The through hole 114 extends through the housing 11 in the left-right direction transverse to the third straight line 103. When a user holds the handle portion 112, the user's fingers can at least partially be positioned in the through hole 114, or the user's fingers can pass through the through hole 114, such that the user's palm and fingers can encircle the handle portion 112 to grip the handle portion 112.

[0072] The fastener driver 100 further comprises a trigger 192 mounted to the handle portion 112, which is operable by a user when holding the handle portion 112. The trigger 192 is configured to be operated by a user to activate the fastener driver 100, and further comprises an operation surface configured to be operated by a user. When a user's hand holds the handle portion 112, the user can contact the operation surface with an index finger to pull the trigger 192. The operation surface is a front surface of the trigger 192. In the present embodiment, the operation surface is an arc surface which fits a user's finger. The trigger 192 is also disposed within the region of the through hole 114.

[0073] In some embodiments, the fastener driver 100 further comprises an illumination assembly 162. The illumination assembly 162 is disposed on the housing 11 to provide auxiliary illumination light when used in a poor light condition, to light up the surrounding environment and facilitate user operation. In some embodiments, the illumination assembly 162 is disposed on the main body portion 111.

[0074] In the present embodiment, the trigger 192 comprises a first trigger 192a corresponding to an activation switch 196a and a second trigger 192b corresponding to an illumination switch 196b for activating the illumination assembly 162. The activation switch 196a and the illumination switch 196b are disposed in the handle portion 112 respectively. The illumination switch 196b is disposed adjacent to the activation switch 196a and is located at the rear side of the first trigger 192a and the second trigger 192b respectively. The illumination switch 196b is further configured to be activated prior to the activation switch 196a, so that the illumination element 196 can be lighted up prior to the fastener driver 100 being activated, to facilitate illuminating the working area. The illumination switch 196b can also be triggered without triggering the activation switch 196a, so that the illumination element 196 can be lighted up to illuminate the working area without the motor 14 being powered.

[0075] In the present embodiment, a linkage assembly is disposed between the second trigger 192b and the first trigger 192a, so that the first trigger 192a can be operated only after the second trigger 192b is operated, to activate the illumination switch 196b prior to the activation switch 196a.

[0076] In some embodiments, the trigger 192 comprises a first trigger 192a corresponding to an activation switch 196a and a safety switch 192c for locking the first trigger 192a. The first trigger 192a can be operated only after the safety switch 192c is operated to activate the activation switch 196a, to prevent the activation switch 196a from being triggered by mistake. In some embodiments, an illumination switch 196b for activating the illumination assembly is separately disposed.

[0077] The fastener driver 100 further comprises a fan 145 fixedly connected with the motor shaft 141 and capable of rotating synchronously with the motor shaft 141. The fan 145 is installed on the upper end of the motor shaft 141. When the fan 145 rotates, it can generate a cooling airflow flowing into the casing 11 from the outside and then flowing out of the casing 11. The casing 11 is formed with an airflow inlet 117 corresponding to the position of the fan 145 and an airflow outlet 116 corresponding to the position of the circuit board assembly 17a. In the present embodiment, a high-power capacitor is arranged on the circuit board assembly 17a. The airflow outlet 116 also corresponds to the position of the capacitor. When the fan 145 rotates, the cooling airflow enters the casing from the airflow inlet 117, flows through the circuit board assembly 17a, and then flows out of the casing from the airflow outlet 116.

[0078] The control circuit board 17a is arranged in the joint 115, and the capacitor is arranged on the upper side of the control circuit board 17a. The lower side of the control circuit board 17a is provided with an electric connection terminal for electrically connecting with the battery pack 300, so that the battery pack 300 supplies power to the motor 14.

[0079] In some embodiments, a partition plate for spacing the motor 14 and the circuit board assembly 17a apart can also be arranged at the joint 115, so that the heat generated by the motor 14 during operation cannot enter the circuit board assembly.

[0080] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the above embodiments do not limit the present application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the protection scope of the present application.

Claims

1. A fastener driver, comprising: The striking assembly includes a striking element that moves from a stopped position to a striking position to strike a fastener; The power mechanism includes a gas spring mechanism that drives the striking component; The gas spring mechanism includes at least: The first cylinder includes a first cylinder bore for supplying external gas into the first cylinder. The second cylinder includes a second cylinder bore for releasing gas from the second cylinder to the outside. The first cylinder is connected to the second cylinder; The first cylinder is equipped with a first piston; Specifically, when the striking component is in the stopped position, the air pressure on both sides of the first piston is different.

2. The fastener driver according to claim 1, characterized in that, When the striking component is in the stopped position, the first piston remains stationary relative to the first cylinder.

3. The fastener driver according to claim 1, characterized in that, The first piston includes a working side configured to contact the gas inside the first cylinder and a communicating side exposed to the outside. When the striking member is in the stopped position, the gas pressure on the working side of the first piston is greater than the gas pressure on the communicating side of the first piston.

4. The fastener driver according to claim 1, characterized in that, The power mechanism also includes an electric motor, which rotates about a motor axis to move the first piston within the first cylinder.

5. The fastener driver according to claim 4, characterized in that, It also includes a controller for controlling the operation of the motor, the controller being configured to control the motor to respond to the stop signal at least after receiving a stop signal and replenishing the first cylinder with gas from the outside through the first cylinder bore.

6. The fastener driver according to claim 5, characterized in that, A signal generating device is configured to generate the stop signal.

7. The fastener driver according to claim 6, characterized in that, When the signal generating device generates the shutdown signal, the external gas is replenished into the first cylinder through the first cylinder bore.

8. The fastener driver according to claim 6, characterized in that, When the signal generating device generates the stop signal, the first piston at least begins to compress the gas in the first cylinder.

9. The fastener driver according to claim 6, characterized in that, The signal generating device is located in the transmission path from the motor to the gas spring mechanism.

10. The fastener driver according to claim 6, characterized in that, The signal generating device is located in the transmission path from the gas spring mechanism to the striking member.

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