Internal rotor nail driving device of electric nail gun

Abstract

An internal rotor nail driving device of an electric nail gun includes an actuator, a swing arm and a nail rod. The actuator includes a stator and a rotor. The stator includes a yoke, teeth, shoes and coils, a length of the yoke is greater than that of each tooth, a length of the yoke multiplied by a thickness of the yoke obtains a first cross-sectional area of ​​the yoke, a length of each tooth multiplied by a width of each tooth obtains a second cross-sectional area of ​​each tooth, the first cross-sectional area of ​​the yoke is smaller than that of each tooth, and the shoes are respectively arranged around the bottom of the tooth. Such that, the present invention can achieve the effect of expanding the winding space of the wire collecting trough by reducing the thickness of the yoke, and the number of winding turns of the coil can be increased or the diameter of the coil becomes larger, thereby increasing the torque output by the actuator. Furthermore, each shoe can support the entire coil, improving winding stability.

Description

[Technical Field]

[0001] The present invention relates to a driving device, and more particularly to an internal rotor type nail driving device for an electric nail gun. [Previous Technology]

[0002] Early carpentry relied on manual hammering and simple mechanical tools to drive nails into various materials such as wood, drywall, or metal, which was widely used in industries such as construction, woodworking, furniture making, and decoration. However, manual hammering was inefficient and labor-intensive. To solve the labor problem of manual hammering and make the work more precise and efficient, some manufacturers developed a pneumatic nail gun, which uses compressed air to drive nails into materials. With the evolution of the times and the availability of energy, various power tools have sprung up, leading to the advent of the electric nail gun.

[0003] Traditional electric nail guns typically include an actuator and a spring element to drive the nail-driving rod downwards for nailing and upwards for resetting. Generally speaking, the way the nail-driving rod is driven by the actuator and spring element can be further subdivided into the following two types:

[0004] One method involves using an actuator to drive a flywheel to rotate. The flywheel, driven by its rotation, accumulates rotational kinetic energy, causing a slide with a nail-driving rod to contact the flywheel. At the moment of contact, the accumulated rotational kinetic energy of the flywheel is rapidly transferred to the slide, causing the nail-driving rod on the slide to instantly output a large amount of linear kinetic energy. This causes the nail-driving rod to move downwards and strike the nail. During the downward strike, the nail-driving rod also causes an elastic element to accumulate and generate elastic potential energy. Subsequently, the elastic potential energy of the elastic element causes the downward-moving nail-driving rod to move upwards and reset.

[0005] Another method is to use an actuator to drive the hammer rod to move upward and reset after the hammer has moved downward. During the reset process, the elastic element can be driven to store pressure and generate elastic potential energy. The release time of the elastic potential energy can be controlled to drive the hammer rod to move downward and convert it into the kinetic energy of hammering.

[0006] However, both of the above-mentioned methods of driving the nail rod with electric energy have problems such as the actuator being unable to directly control the reciprocating movement of the nail rod according to the nail driving stroke, and the rotational power output by the actuator needing to be converted by an energy conversion mechanism before it can be used as nail driving power. As a result, the structure of the electric nail gun is too complicated and needs to be improved.

[0007] To this end, the inventors have proposed Republic of China Patent Publication No. I791263 "Nail-driving device for electric nail machine" and Republic of China Patent Publication No. I824800 "Internal rotor type nail-driving device for electric nail machine". Both of these patents can improve the shortcomings of traditional nail-driving technology.

[0008] A conventional electric nail gun includes an actuator, a swing arm, and a nail-driving rod. As mentioned above, the actuator can be divided into an external rotor type actuator and an internal rotor type actuator according to its structural configuration. The internal rotor type actuator includes a stator and a rotor, the rotor being disposed in the magnetic guide hole of the stator and including a plurality of magnetic plates. One end of the swing arm is disposed in the rotor. One end of the nail-driving rod is disposed in the other end of the swing arm. More specifically, the stator includes a yoke, a plurality of teeth, a plurality of shoe parts, and a plurality of coils, and a magnetic guide hole is formed at its center. The teeth are respectively disposed on the inner sidewall of the yoke. Each shoe part includes a first support part and a second support part, the first support part and the second support part being respectively disposed on two sides of the bottom of each tooth part. An opening is formed between two adjacent shoe parts, and the yoke, the teeth, and the shoe parts form a plurality of wire-collecting slots, the opening communicating with the magnetic guide hole and each wire-collecting slot. The coils are wound around the teeth and pass through the feed grooves. The first and second supports of each boot support each coil on its two sides.

[0009] However, the internal space of the housing of a conventional electric nail gun is limited, and the length of the yoke and the length of each tooth are equal. Therefore, the winding space that each wire slot can provide is limited, resulting in fewer coils or a smaller diameter. Because the number of coils or the diameter of the coils are smaller, the torque generated by the interaction between the coils and the magnetic field of the rotor's magnetic plates when current flows through them is smaller.

[0010] Furthermore, the end faces of the two ends of each shoe part are aligned with the end faces of the two ends of each tooth part, and the shoe part cannot support the two ends of the coils, causing the two ends of the coils to be suspended and prone to collapsing downwards. [Summary of the Invention]

[0011] The main objective of this invention is to provide an internal rotor type nail driving device for an electric nail gun, which can improve the output torque of the actuator.

[0012] Another object of the present invention is to provide an internal rotor type nail driving device for an electric nail gun, which can improve the winding stability.

[0013] In order to achieve the aforementioned objective, the present invention provides an internal rotor type nail driving device for an electric nail gun, comprising an actuator, a swing arm and a nail driving rod. The actuator includes a stator and a rotor. The stator includes a yoke, a plurality of teeth, a plurality of shoe portions, and a plurality of coils, and a magnetic hole is formed at its center. The yoke is annular. The teeth are disposed on the inner sidewall of the yoke. The length of the yoke is greater than the length of each tooth. The length of the yoke multiplied by the thickness of the yoke gives a first cross-sectional area of ​​the yoke. The length of each tooth multiplied by the width of each tooth gives a second cross-sectional area of ​​each tooth. The first cross-sectional area of ​​the yoke is smaller than the second cross-sectional area of ​​each tooth. The shoe portions are respectively disposed at the bottom of the teeth. An opening is formed between two adjacent shoe portions. The yoke, the teeth, and the shoe portions together form a plurality of wire-collecting slots. The opening communicates with the magnetic hole and each wire-collecting slot. The coils are respectively wound on the teeth and pass through the wire-collecting slots. The shoe portions respectively support the coils. The rotor is disposed in the magnetic hole and includes a plurality of magnetic plates. One end of the swing arm is attached to the rotor. One end of the nail-driving rod is attached to the other end of the swing arm.

[0014] In some embodiments, the yoke includes a plurality of plates that are spliced ​​together to form a rectangle. The length of each plate is greater than the length of each tooth. The first cross-sectional area of ​​the yoke is obtained by multiplying the length of each plate by the thickness of each plate.

[0015] In some embodiments, the first cross-sectional area of ​​the yoke is half of the second cross-sectional area of ​​each tooth.

[0016] In some embodiments, the number of such magnetic sheets is equal to the number of such teeth.

[0017] In some embodiments, the stator further includes a plurality of insulating layers disposed on the inner surface of the yoke, the outer surface of the teeth, and the top surface of the boots, wherein the coils contact the insulating layers.

[0018] The advantage of this invention is that, in order to maintain the first cross-sectional area of ​​the yoke at a size smaller than the second cross-sectional area of ​​each tooth, when the length of the yoke is greater than the length of each tooth, some magnetic lines of force are directly distributed along the left and right sides of the yoke, and some magnetic lines of force are distributed along the top and bottom of the yoke and along the left and right sides of the yoke, thereby achieving the effect of dispersing the path of the magnetic lines of force. Therefore, the thickness of the yoke of this invention is thinner than that of the yoke in the prior art. Compared to the prior art, given the limited internal space of the electric nail gun housing, this invention can increase the winding space of the wire-collecting slots by reducing the thickness of the yoke, thereby increasing the number of coils wound around the teeth or increasing the diameter of the coils. Because the number of coils wound around the teeth increases or the diameter of the coils increases, the output torque of the actuator can be increased through the interaction between the coils and the magnetic plates of the rotor when energized.

[0019] To achieve the aforementioned objective, the present invention provides an internal rotor type nail-driving device for an electric nail gun, comprising an actuator, a swing arm, and a nail-driving rod. The actuator includes a stator and a rotor. The stator includes a yoke, a plurality of teeth, a plurality of shoe portions, and a plurality of coils, with a magnetically conductive hole formed at its center. The yoke is annular. The teeth are disposed on the inner sidewall of the yoke. The shoe portions are respectively disposed around the bottom of the teeth, with an opening formed between adjacent shoe portions. The yoke, the teeth, and the shoe portions together form a plurality of wire-collecting grooves. The opening communicates with the magnetically conductive hole and each of the wire-collecting grooves. The coils are respectively wound around the teeth and pass through the wire-collecting grooves. The shoe portions respectively support two sides and two ends of the coils. The rotor is disposed in the magnetically conductive hole and includes a plurality of magnetic plates. One end of the swing arm is disposed on the rotor. One end of the nail-driving rod is disposed on the other end of the swing arm.

[0020] In some embodiments, the yoke includes a plurality of plates that are joined together to form a rectangle.

[0021] In some embodiments, the number of such magnetic sheets is equal to the number of such teeth.

[0022] In some embodiments, the stator further includes a plurality of insulating layers disposed on the inner surface of the yoke, the outer surface of the teeth, and the top surface of the boots, wherein the coils contact the insulating layers.

[0023] In some embodiments, each of the boot portions includes a first support portion, a second support portion, a third support portion and a fourth support portion. The first support portion and the second support portion are respectively disposed on two sides of the bottom of each of the teeth, and the third support portion and the fourth support portion are respectively disposed at two ends of the bottom of each of the teeth. The first support portion and the second support portion support two sides of each coil, and the third support portion and the fourth support portion support two ends of each coil.

[0024] The advantage of this invention is that each boot part can support the entire coil, improve the winding stability, and prevent the problem of part of the coil being suspended and collapsing downwards.

Implementation Method

[0026] The embodiments of the present invention will be described in more detail below with reference to the drawings and component symbols, so that those skilled in the art can implement them after reading this specification.

[0027] Figure 1 is a perspective view of the internal rotor type nail driving device of the electric nail gun of the present invention. Figure 2 is an exploded view of the internal rotor type nail driving device of the electric nail gun of the present invention. Figure 3 is a cross-sectional view along line III-III of Figure 1. Figure 4 is a cross-sectional view along line IV-IV of Figure 1. Figure 5 is a perspective view of the plate 1111 and the tooth 112 of the present invention. Figure 6 is a perspective view of the tooth 112 and the boot 113 of the present invention. Figure 7A is a cross-sectional view of the path of the magnetic field lines of the present invention. Figure 7B is a perspective view of the path of the magnetic field lines of the present invention through a single combination of the plate 1111, the tooth 112 and the boot 113. Figure 8 is a side view of the internal rotor type nail driving device of the electric nail gun of the present invention. As shown in Figures 1, 2, 3, 4, 5, 6, 7A, 7B and 8, the present invention provides an internal rotor type nail driving device for an electric nail gun, including an actuator 10, a swing arm 20 and a nail driving rod 30. The actuator 10 includes a stator 11 and a rotor 12. The stator 11 includes a yoke 111, a plurality of teeth 112, a plurality of shoe portions 113, and a plurality of coils 114, with a magnetically conductive hole 115 formed at its center. The yoke 111 is annular, and the teeth 112 are disposed on the inner sidewall of the yoke 111. The length L1 of the yoke 111 is greater than the length L2 of each tooth 112. The length L1 of the yoke 111 multiplied by the thickness T of the yoke gives a first cross-sectional area of ​​the yoke 111. The length L2 of each tooth 112 multiplied by the width W of each tooth 112 gives a second cross-sectional area of ​​each tooth 112. The first cross-sectional area of ​​the yoke 111 is smaller than the second cross-sectional area of ​​each tooth 112. The shoe portions 113 are respectively disposed around the bottom of the teeth 112. An opening 116 is formed between two adjacent shoe portions 113. The yoke 111, the toothed portions 112, and the shoe portions 113 together form a plurality of wire-collecting grooves 117. The opening 116 communicates with the magnetic guide hole 115 and each wire-collecting groove 117. The coils 114 are respectively wound on the toothed portions 112 and pass through the wire-collecting grooves 117. The shoe portions 113 respectively support two sides and two ends of the coils 114. The rotor 12 is disposed in the magnetic guide hole 115 and includes a plurality of magnetic plates 121A and 121B. One end of the swing arm 20 is disposed on the rotor 12. One end of the hammer rod 30 is disposed on the other end of the swing arm 20.

[0028] Figure 9A is a cross-sectional view of the internal rotor type nail driving device of the electric nail gun of the present invention installed on the body of the electric nail gun 100. Figure 9B is a schematic diagram of region A of Figure 9A. As shown in Figures 9A and 9B, the internal rotor type nail driving device of the electric nail gun of the present invention is fixed inside a housing 110 of the electric nail gun 100. One side of the interior of the housing 110 has a guide groove 120, and the nail driving rod 30 is disposed in the guide groove 120. Before nailing, the other end of the nail driving rod 30 is located inside the guide groove 120.

[0029] Figure 10A is a schematic diagram of the internal rotor type nail driving device of the electric nail gun of the present invention in the process of nailing. Figure 10B is a schematic diagram of region B of Figure 10A. As shown in Figures 10A and 10B, when current passes through the coils 114, the magnetic plates 121A and 121B generate an electrical and magnetic interaction to drive the rotor 12 to rotate by a specific rotation angle. The rotor 12 drives the swing arm 20 to rotate, and the swing arm 20 drives the other end of the nail-driving rod 30 to move downward to the opening 1201 of the guide groove 120, so that the nail-driving rod 30 can drive the nail (not shown) into the material.

[0030] As shown in FIG5, in order to maintain the first cross-sectional area of ​​the yoke 111 smaller than the second cross-sectional area of ​​each tooth 112, when the length L1 of the yoke 111 is greater than the length L2 of each tooth 112, as shown in FIG7A and FIG7B, some magnetic lines of force are distributed along the left and right sides of the yoke 111, and some magnetic lines of force are distributed along the top and bottom of the yoke 111 and along the left and right sides of the yoke 111, thereby achieving the effect of dispersing the path of the magnetic lines of force. As a result, the thickness of the yoke 111 of the present invention is thinner than that of the yoke of the prior art. Compared with the prior art, in the case of limited internal space of the housing 110 of the electric nail gun, the present invention can achieve the effect of expanding the winding space of the wire collection grooves 117 by reducing the thickness of the yoke 111, thereby increasing the number of turns of the coils 114 wound around the teeth 112 or increasing the diameter of the coils 114. Because the number of turns of the coils 114 wound around the teeth 112 increases or the diameter of the coils 114 increases, the output torque of the actuator 10 can be increased by the interaction between the coils 114 and the magnetic fields of the magnetic plates 121A and 121B of the rotor 12 when current flows through them. It should be noted that, in order to clearly show the magnetic lines of force, the size or shape of some components in Figures 7A and 7B are slightly modified, and the actual structure is still mainly shown in other figures.

[0031] Furthermore, each shoe part 113 can support the entire coil 114, improving the winding stability and preventing the problem of some coils 114 being suspended and collapsing downwards.

[0032] It is worth mentioning that the enameled wire can enter the wire feeding groove 117 through the opening 116 to be wound around the teeth 112 to form the coils 114.

[0033] As shown in Figures 1, 2, and 5, in a preferred embodiment, the yoke 111 includes a plurality of plates 1111, which are spliced ​​together to form a rectangle. The length L1 of each plate 1111 multiplied by the thickness T of each plate 1111 gives the first cross-sectional area of ​​the yoke 111. More specifically, the yoke 111 has a total of four plates 1111, each plate 1111 having a protrusion 11111 at one end and a groove 11112 at the other end. The protrusion 11111 of one of the plates 1111 is inserted into the groove 11112 of the other plate 1111, so that the plates 1111 are spliced ​​together to form a rectangle. Therefore, each plate 1111, each tooth 112 and each insulating layer 118 described later are first fixed by a plurality of fasteners 40, and then each coil 114 is wound around each tooth 112 to form a single assembly. Finally, the plates 1111 are spliced ​​together so that the four assemblies are assembled into a stator 11, achieving the effect of easy assembly and production using simple equipment.

[0034] As shown in Figures 5, 7A, and 7B, in a preferred embodiment, the first cross-sectional area of ​​the yoke 111 is half the second cross-sectional area of ​​each tooth 112. Specifically, the magnetic sheets 121A and 121B are configured as an even array and together with the even array of conductive strands, form an even array of magnetic components. The conductive strands can generate an effective magnetic field with the same current direction, and the magnetic sheets 121A and 121B can generate magnetic lines of force to induce the effective magnetic field of the conductive strands. The magnetic sheets 121A are respectively arranged correspondingly to each other along their respective normal directions, and are all arranged with the inner surface as the N pole and the outer surface as the S pole, so as to provide magnetic lines of force radiating from the inside to the outside to two of the conductive strands respectively. In other words, the magnetic lines of force of the magnetic sheets 121A radiate from the inner surface to the outer surface. The magnetic plates 121B are respectively arranged corresponding to each other along their respective normal directions, and are also arranged in a spaced-apart manner with the magnetic plates 121A. The magnetic plates 121B are all arranged with their outer surface as the N pole and their inner surface as the S pole, to provide magnetic field lines radiating from the outside to the other two of the conductor bundles. In other words, the magnetic field lines of the magnetic plates 121B radiate from the outer surface to the inner surface. According to the above arrangement, the magnetic field lines generated by two adjacent magnetic plates 121A and 121B have opposite pole directions. The magnetic field lines pass through two of the shoe portions 113 and two of the tooth portions 112, then proceed to both sides of the plates 1111 to the two sides of adjacent plates 1111, then through the other two tooth portions 112 and the other two shoe portions 113, and along the air gap between the stator 11 and the rotor 12, to surround the wire feeder slots 117.

[0035] As shown in Figures 2 and 4, in a preferred embodiment, the number of magnetic plates 121A and 121B is equal to the number of teeth 112. Specifically, as shown in Figures 7A and 7B, two wire slots 117 are opened opposite each other in the stator 11 at a 180-degree angle, so that a single coil 114 is wound to form two wire bundles that can generate opposite current directions. Moreover, the N and S poles of the magnetic lines generated by the two magnetic plates 121A and 121B are opposite and fixed to the outer wall of the rotor 12 at a 180-degree angle, so as to sense the different directions of current generated by the wire bundles. In this way, the two magnetic plates 121A and 121B can also generate tangential forces with the same direction of rotation, thereby driving the rotor 12 to rotate by a specific rotation angle and driving the nail-driving rod 30 to drive the nail into the material.

[0036] As shown in Figures 2, 3, and 4, the stator 11 further includes a plurality of insulating layers 118, which are respectively disposed on the inner surface of the yoke 111, the outer surface of the teeth 112, and the top surface of the boots 113, and the coils 114 contact the insulating layers 118. Therefore, the insulating layers 118 provide insulation between the coils 114 and components such as the yoke 111, the teeth 112, and the boots 113.

[0037] As shown in Figure 6, in a preferred embodiment, each boot portion 113 includes a first support portion 1131, a second support portion 1132, a third support portion 1133, and a fourth support portion 1134. The first support portion 1131 and the second support portion 1132 are respectively disposed on both sides of the bottom of each tooth portion 112, and the third support portion 1133 and the fourth support portion 1134 are respectively disposed on both ends of the bottom of each tooth portion 112. As shown in Figures 3 and 4, the first support portion 1131 and the second support portion 1132 respectively support both sides of each coil 114, and the third support portion 1133 and the fourth support portion 1134 respectively support both ends of each coil 114. Therefore, each boot portion 113 can support the entire coil 114, improving winding stability and preventing the problem of some coils 114 becoming suspended and collapsing downwards.

[0038] As shown in Figures 1, 2, 3 and 9A, in a preferred embodiment, the actuator 10 further includes a plurality of bearings 13, and the housing 110 has a fixed shaft 1101 on which the bearings 13 are disposed. The fixed shaft 1101 passes through the axis of the rotor 12, and the rotor 12 can rotate smoothly on the fixed shaft 1101 by means of the bearings 13.

[0039] As shown in Figures 2 and 8, in a preferred embodiment, one end of the rotor 12 is annular and has a plurality of axially extending protrusions 122, and one end of the swing arm 20 has an internal spline 21, wherein the protrusions 122 of the rotor 12 are tenoned to the internal spline 21 of the swing arm 20. As shown in Figures 2 and 8, in a preferred embodiment, the other end of the swing arm 20 has a plurality of protrusions 22, and one end of the nail-driving rod 30 has a rack 31, wherein the protrusions 22 of the swing arm 20 engage with the rack 31 of the nail-driving rod 30.

[0040] The above description is only for explaining the preferred embodiments of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications or changes made to the present invention under the same inventive spirit should still be included in the scope of protection intended by the present invention. [Simplified Explanation of the Diagram]

[0025] Figure 1 is a perspective view of the internal rotor type nail driving device of the electric nail gun of the present invention. Figure 2 is an exploded view of the internal rotor type nail driving device of the electric nail gun of the present invention. Figure 3 is a cross-sectional view along line III-III of Figure 1. Figure 4 is a cross-sectional view along line IV-IV of Figure 1. Figure 5 is a perspective view of the plate and teeth of the present invention. Figure 6 is a perspective view of the teeth and boot of the present invention. Figure 7A is a cross-sectional view of the path of the magnetic field lines of the present invention. Figure 7B is a perspective view of the path of the magnetic field lines of the present invention through a single combination of the plate, teeth and boot. Figure 8 is a side view of the internal rotor type nail driving device of the electric nail gun of the present invention. Figure 9A is a cross-sectional view of the internal rotor type nail driving device of the electric nail gun of the present invention installed on the body of the electric nail gun. Figure 9B is a schematic diagram of region A of Figure 9A. Figure 10A is a schematic diagram of the internal rotor type nail driving device of the electric nail gun of the present invention driving nails. Figure 10B is a schematic diagram of region B of Figure 10A.

Claims

1. An internal rotor type nail-driving device for an electric nail gun, comprising: An actuator includes a stator and a rotor. The stator includes a yoke, a plurality of teeth, a plurality of shoe parts, and a plurality of coils, and a magnetic hole is formed at its center. The yoke is annular. The teeth are disposed on the inner sidewall of the yoke. The length of the yoke is greater than the length of each tooth. The length of the yoke multiplied by the thickness of the yoke gives a first cross-sectional area of ​​the yoke. The length of each tooth multiplied by the width of each tooth gives a second cross-sectional area of ​​each tooth. The first cross-sectional area of ​​the yoke is smaller than the second cross-sectional area of ​​each tooth. The shoe parts are respectively disposed at the bottom of the teeth. An opening is formed between two adjacent shoe parts. The yoke, the teeth, and the shoe parts together form a plurality of wire-collecting slots. The opening communicates with the magnetic hole and each wire-collecting slot. The coils are respectively wound on the teeth and pass through the wire-collecting slots. The shoe parts respectively support the coils. The rotor is disposed in the magnetic hole and includes a plurality of magnetic plates. A swing arm, one end of which is disposed on the rotor; and a hammer rod, one end of which is disposed on the other end of the swing arm.

2. The internal rotor type nail driving device of the electric nail gun as described in claim 1, wherein, The yoke comprises a plurality of plates that are joined together to form a rectangle. The length of each plate is greater than the length of each tooth. The first cross-sectional area of ​​the yoke is obtained by multiplying the length of each plate by its thickness.

3. The internal rotor type nail-driving device for the electric nail gun as described in claim 1 or 2, wherein, The first cross-sectional area of ​​the yoke is half the second cross-sectional area of ​​each tooth.

4. The internal rotor type nail driving device for the electric nail gun as described in claim 1, wherein, The number of such magnetic plates is equal to the number of such teeth.

5. The internal rotor type nail driving device for the electric nail gun as described in claim 1, wherein, The stator further includes a plurality of insulating layers disposed on the inner surface of the yoke, the outer surface of the teeth, and the top surface of the boots, with the coils contacting the insulating layers.

6. An internal rotor type nail driving device for an electric nail gun, comprising: An actuator includes a stator and a rotor. The stator includes a yoke, a plurality of teeth, a plurality of shoe portions, and a plurality of coils, with a magnetically conductive hole formed at its center. The yoke is annular. The teeth are disposed on the inner sidewall of the yoke. Each shoe portion includes a first support portion, a second support portion, a third support portion, and a fourth support portion. The first and second support portions are respectively disposed on two sides of the bottom of each tooth portion, and the third and fourth support portions are respectively disposed on the bottom of each tooth portion. An opening is formed between two adjacent shoe portions at the bottom of the tooth portion. The yoke portion, the tooth portions, and the shoe portions together form a plurality of wire-collecting grooves. The opening communicates with the magnetic guide hole and each wire-collecting groove. The coils are wound on the tooth portions and pass through the wire-collecting grooves. The first support portion and the second support portion support the two sides of each coil respectively. The third support portion and the fourth support portion support the two ends of each coil respectively. The rotor is disposed in the magnetic guide hole and includes a plurality of magnetic plates. A swing arm is disposed at one end of the rotor. A hammer rod is disposed at one end of the other end of the swing arm.

7. The internal rotor type nail driving device for the electric nail gun as described in claim 6, wherein, The yoke comprises a plurality of plates that are joined together to form a rectangle.

8. The internal rotor type nail driving device for the electric nail gun as described in claim 6, wherein, The number of such magnetic plates is equal to the number of such teeth.

9. The internal rotor type nail driving device for the electric nail gun as described in claim 6, wherein, The stator further includes a plurality of insulating layers disposed on the inner surface of the yoke, the outer surface of the teeth, and the top surface of the boots, with the coils contacting the insulating layers.

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