TWI417688B - Photosensitive drum of the conductive device - Google Patents

Description

Photoconductor drum conductive device

The present invention mainly discloses a conductive device, and more particularly to a conductive device for a photosensitive drum used in a printing system.

The photosensitive drum is the core of the printing technique, and has a special characteristic that the photosensitive drum is electrically conductive when exposed, but is an insulator when the photosensitive drum is not exposed to light.

The drum operation program mainly includes six steps of power distribution, exposure, development, transfer, cleaning and power removal. When the printing system receives the printing instruction, the cloth pole or the corona device is electrically connected to the photosensitive drum, so that the surface of the photosensitive drum is filled with a negative electric charge or a positive electric potential, and the processor of the printing system transmits the image data. The laser beam or the light-emitting diode beam is irradiated onto the photosensitive drum to form an exposure at a corresponding position, and the surface static charge at the exposure position is generated by the electron-hole pair generated by the charge generating layer in the photosensitive drum due to illumination. To neutralize the negative or positive charge on the surface of the drum, the area reaching the exposure is electrically neutral and no longer has an electrostatic charge. Then, since the toner has the same electric charge as the photosensitive drum, when the rapidly rotating photosensitive drum passes through the toner cartridge, the exposed portion absorbs the charged toner to further visualize the image. When the paper enters the inside of the printing system with a positive or negative charge opposite to the toner, the toner on the drum is transferred to the paper due to the attraction of the opposite sex. Finally, the residual toner on the photosensitive drum is cleaned, and the residual toner is cleaned by a doctor blade while removing static electricity, so that the potential of the surface of the photosensitive drum is returned to the initial state, so as to unfold the next loop motion.

In order to achieve the photosensitive property of the photosensitive drum and the insulating property when not exposed, the photosensitive drum may form a three-layer (or three or more) coating layer on the aluminum substrate, or may be formed on the aluminum substrate after the anode treatment. The coating layer of two layers (or two or more layers) is exemplified by a process of forming a three-layer coating layer on an aluminum substrate. The first layer is an adsorption layer or a resistive layer having a thickness of about >0.5 μm; the second layer is a photosensitive layer and a charge generating layer having a thickness of <1 μm. The composition of the layer is a dye, and the function is to generate an electron hole after exposure. The third layer is a conductive layer and a charge-conducting layer, and its thickness is 10~50μm. Its main purpose is to charge the charge and act as a protective layer of the photosensitive drum, and the positive or negative charge generated after exposure and the photosensitive drum The surface is negative or positively neutralized.

The first layer of coating applied on the aluminum substrate acts to adsorb and bond the coating, and the surface roughness of the aluminum substrate is changed by the first layer coating treatment, and the aluminum substrate is controlled by the aluminum substrate. Surface roughness prevents unwanted interference from incident laser light. And further increase the impedance value of the photosensitive drum, so that the photosensitive drum has a stored charge to maintain aging. During the process of charging, exposing, developing, and transferring the photosensitive drum, the electric charge that needs to be attached to the photosensitive drum can be continuously maintained until the transfer step. And when the laser beam is subjected to an exposure step, the laser beam can quickly remove the previously charged charge completely from the surface of the photosensitive drum.

A photosensitive drum having an anodized layer and a two-layer coating layer, although the anode treatment can provide a better printing effect for the photosensitive drum, the cost of the anode treatment is quite high, and the anode treatment is located at the bottom layer, and when the other layer is coated When the layer is coated or transported to cause collision or damage of the processed photosensitive drum, the photosensitive drum which has been processed and defective is formed to be scrapped and cannot be used.

Later, with the three-layer coating layer of the photosensitive drum, the first coating layer replaced the anodized layer based on the lower cost factor, and the first coating layer has the main effect of the anodized layer, but The first coating layer achieves poor performance. The first coating layer mainly has a "defect of the photosensitive drum which is subjected to a large current and is broken down" because the first coating layer is a coating technique, and the photosensitive drum area is large and the coating material is likely to be unevenly mixed. The local area is rendered low impedance, and the low impedance portion will form a short circuit and cause a large current to break down.

Referring to China Patent Publication No. 373593 "Photosensitive roller holder", a photosensitive roller fixing shaft hole is arranged in front of a main body, and a hollow recovery groove is formed on the back side, and includes: a toner recovery mechanism and A high-voltage line cleaning mechanism is combined; by the above mechanism, one of the following: the driving gear and the driven gear are driven by the rotating mechanism of the photosensitive drum to drive the recovery scraper to rotate, and when the scraper is used, the photosensitive drum is not transferred. After the toner is scraped off, the recycling scraper can scrape the toner into the recovery tank, and block the toner with a baffle to prevent the toner from falling on the photocopying paper; Second: the high-voltage wire cleaning mechanism The pull rod is pulled to one side. When the slide is pulled forward by the oblique side of the slide rail, the push piece will be retracted along the wall surface of the slide rail to force the two pressure plates to move inward respectively, and the cleaning block is pressed. Attached to the high-voltage line, when the sliding seat is pulled back and forth, the high-voltage line can be cleaned and wiped to achieve better use.

It can be known from the aforementioned patent that when the photosensitive drum is installed in the photosensitive drum, the photosensitive drum is provided with a driven gear, and it is driven by the transmission gear to generate a turning effect. In addition to the drive function, the driven gear acts as an important medium in the step of powering up.

The driven gear is connected to a metal shaft, and the driven gear is attached with a copper piece. The metal shaft simultaneously contacts the inner circumference of the copper piece, and the outer periphery of the copper piece contacts the photosensitive drum. When the metal shaft receives the external power transmission, the metal shaft is electrically contacted with the copper sheet, and the copper sheet is electrically contacted with the photosensitive drum to further complete the step of discharging.

The photosensitive drum currently in use can be changed to have conductive characteristics and have insulating properties. In order to provide the photosensitive drum with such characteristics, the coating layer on the photosensitive drum appears to be quite important, and the coating layer on the photosensitive drum is not allowed to have impurities, uneven thickness, and the like. Therefore, the process requirements of the photosensitive drum are extremely strict, and the cost of such a coating method is high. Furthermore, since the photosensitive roller has to repeat the loop of the six steps of the aforementioned photosensitive roller operation procedure, the performance of the photosensitive roller may be lowered after the photosensitive roller is used for a period of time, which may be due to a decrease in the efficiency of the electrical discharge, or The charge cannot be quickly and completely left from the photosensitive drum during exposure, so that the toner is not fixed enough, or the toner is not cleaned so that residual toner adheres to the photosensitive drum. When the photosensitive roller can not provide the initial working effect, the photosensitive roller must be replaced with a new one. However, in the cumbersome process of the photosensitive roller, directly replacing the photosensitive roller of the new product is undoubtedly a considerable burden for the consumer.

Accordingly, the present invention is intended to obviate or at least alleviate the problems encountered in the prior art.

The technical problem to be solved by the present invention is to provide a conductive device for a photosensitive drum in view of the deficiencies in the prior art.

The main technical improvement of the invention is that the conductive device has the function of controlling the magnitude of the current, and the conductive device directly provides an appropriate impedance capability, and can avoid excessive leakage current. Since the photosensitive drum has a plurality of coating layers, the coating layer belongs to a coating film mixture, which is a non-uniform material, and the coating film of the coating layer absorbs water, and the electric resistance value becomes low, resulting in deterioration of insulation and electric leakage. The conductive device of the present invention provides a uniform resistance value, and the impedance is not affected by changes in temperature and humidity, so that the conductive device is not affected by the coating 瑕疵 of the photosensitive drum, and is not affected by the ambient temperature and humidity, and can improve the quality of the conventional photosensitive drum. The lack of control is not easy. Moreover, the conductive device can avoid the breakdown problem of the photosensitive drum, and the resistance value of the conductive device has no local low impedance and the large current breakdown is lost. The conductive device of the present invention does provide the printing capability that meets the requirements.

The technical means for the secondary improvement of the present invention is that the resistor member has an impedance capability for the flow of current, and the resistor member can avoid the lack of breakdown of the photosensitive drum by a large current, and can avoid the occurrence of a short circuit.

Another technical means for improvement of the present invention is that the cost of the conductive device is much lower than the cost of the photosensitive drum, and even when the conductive device is worn out, the user can replace the less expensive conductive device to save printing cost. The effect.

Other objects, advantages and novel features of the invention will be apparent from the description and appended claims.

The technology, means and effects of the present invention are set forth in the accompanying drawings, and the description of the drawings and the accompanying drawings.

1 , 2 and 3 are a perspective view, an exploded perspective view and a cross-sectional view of a photosensitive drum, a photosensitive drum and a conductive device of the present invention. The conductive device 1 of the present invention is axially coupled to the photosensitive drum 2 of the printing system, and the photosensitive drum 2 is disposed in the photosensitive drum 3. The conductive device 1 can be coupled to the photosensitive drum 2 which is not anodized. The two ends of the photosensitive drum 2 are respectively connected to the photosensitive drum 3 by the conductive device 1 and a shaft connector (not shown). 1 and the shaft joint have teeth on the outer circumference thereof, and can be further driven to rotate the photosensitive drum 2 by the transmission. The photosensitive drum 3 is provided with a metal shaft 301. The metal shaft 301 is disposed through the photosensitive drum 3 and the conductive device 1. The metal shaft 301 and the photosensitive drum 2 are electrically connected by the conductive device 1.

The conductive device 1 has the effect of controlling the magnitude of the current, and the conductive device 1 directly provides an appropriate impedance capability to avoid excessive leakage current. Since the photosensitive drum 2 has a plurality of coating layers, the coating layer belongs to a coating film mixture, which is a non-uniform material, and the coating film of the coating layer absorbs water, and the electric resistance value becomes low, resulting in deterioration of insulation and electric leakage. The conductive device 1 of the present invention provides a uniform resistance value, and the impedance is not affected by the temperature and humidity changes, so that the conductive device 1 is not affected by the coating 瑕疵 of the photosensitive drum 2, and is not affected by the ambient temperature and humidity, and can improve the conventional The photosensitive drum 2 is not easy to control the quality of the tube. Furthermore, the conductive device 1 can avoid the breakdown problem of the photosensitive drum 2, and the resistance value of the conductive device 1 has no local low impedance and causes a large current breakdown. The conductive device 1 of the present invention is indeed capable of providing a printing capability that meets the requirements.

4 and FIG. 5 are a perspective view and an exploded perspective view of the conductive device of the present invention. The conductive device 1 includes a receiving member 10, a first guiding member 20, a resisting member 30 and a second guiding member 40. The receiving member 10 can be tightly coupled to the inner edge of the photosensitive drum 2, and the receiving member 10 sequentially joins the first guiding member 20, the resistor member 30 and the second guiding member 40. The conductive device 1 provides an efficient transfer current effect by the first guiding member 20 and the second guiding member 40, and the impedance generated by the resistor member 30 further controls the magnitude of current circulation.

6 and FIG. 7 and FIG. 8 are cross-sectional views of the conductive device of the present invention. The receiving member 10 is coupled to the inner edge of the photosensitive drum 2. The receiving member 10 includes a first end 101 and a second end 102. The outer edge of the receiving member 10 includes a pressing edge 11, a receiving groove 12 and a flange. 13 and a tooth portion 14, the pressing edge 11 has a first outer diameter D1, and the first outer diameter D1 of the pressing edge 11 is equal to the inner edge of the photosensitive drum 2. The flange 13 is located between the pressing edge 11 and the tooth portion 14 . The pressing edge 11 is adjacent to the receiving groove 12 . The receiving groove 12 is adjacent to the end surface of the first end 101 of the receiving member 10 . 14 is located at the second end 102. The receiving member 10 is axially provided with a through hole 15 penetrating the first end 101 and the second end 102, the through hole 15 having a first inner diameter d1. An end surface of the first end 101 of the receiving member 10 forms an attaching surface 16 , and a plurality of joint portions 17 are protruded from the mounting surface 16 .

The receiving member 10 can be disposed on the photosensitive drum 2, and the pressing edge 11 of the receiving member 10 is tightly disposed on the inner edge of the photosensitive drum 2. The flange 13 is disposed on the end surface of the photosensitive drum 2, and the tooth portion 14 is disposed. The end face of the second end 102 of the receiving member 10 abuts against the inner wall of the photosensitive drum 3, and the metal shaft 301 passes through the through hole 15 of the receiving member 10.

The first guiding member 20 is formed in a sheet shape and approximately annular shape, and can transmit current efficiently. The first guiding member 20 is prepared from a high-conductivity metal material such as copper, aluminum, silver, etc. The mounting surface 16 of the receiving member 10 includes an outer peripheral edge 21, a plurality of fixing holes 22 and a through hole 23. The outer peripheral edge 21 has an irregular shape, and the outer peripheral edge 21 has a second shape. The outer diameter D2 is the longest distance of the outer peripheral edge 21, and the inner diameter of the photosensitive drum 2 is less than or equal to the second outer diameter D2. The outer peripheral edge 21 is provided with at least one first pin 24, the first pin 24 of the outer peripheral edge 21 abuts against the inner edge of the photosensitive drum 2, and the first pin 24 is tightly disposed on the photosensitive drum 2 In the inner edge, the first pin 24 is bent and can be received in the receiving slot 12 of the receiving member 10. In this embodiment, four first pins 24 are provided, and the second outer diameter D2 is opposite. The distance between the two first pins 24 . The fixing hole 22 is sleeved on the joint portion 17 of the receiving member 10. The metal shaft 301 is disposed in the hole 23, and the hole 23 has a second inner diameter d2. The hole 23 is not in contact with the metal shaft 301.

The resistor member 30 has an impedance capability for the flow of current, and the resistor member 30 can prevent the photoconductor drum 2 from being damaged by a large current and can avoid the occurrence of a short circuit. The resistor member 30 is attached to the first guiding member 20, and the resistor member 30 has an opposite first surface 31 and a second surface 32. The resistor member 30 has a third outer diameter D3, and the resistor member 30 further includes A fixing hole 33 and a hole 34 are provided. The first surface 31 of the resistor member 30 is electrically connected to the first guiding member 20, so that the resistor member 30 is in electrical contact with the first guiding member 20, and the fixing hole 33 is sleeved on the joint portion 17 of the receiving member 10. The metal shaft 301 is disposed through the hole 34. The hole 34 has a third inner diameter d3. The third inner diameter d3 is equal to the second inner diameter d2. The hole 34 is not in contact with the metal shaft 301.

The second guiding member 40 is formed in a sheet shape and approximately annular shape, and can transmit current efficiently. The second guiding member 40 is made of high-conductivity metal materials such as copper, aluminum, silver, etc., and is electrically connected. The second surface 32 of the resistor member 30 has a fourth outer diameter D4 which is equal to the third outer diameter D3. The second guiding member 40 includes an inner peripheral edge 41 and a plurality of fixing holes 42 having an irregular shape. The inner peripheral edge 41 has a fourth inner diameter d4, and the fourth inner diameter d4 is the inner peripheral edge 41. The fourth inner diameter d4 is equal to or smaller than the outer diameter of the metal shaft 301 with respect to the shortest distance. The inner circumference 41 protrudes from the at least one second pin 43 , and the inner circumference 41 forms at least two grooves 44 , and the second pin 43 is located between the two grooves 44 , by the groove 44 The end portion of the second pin 43 further defines an abutting portion 431. In the embodiment, the inner peripheral edge 41 has two second pins 43 protruding therefrom. The inner circumference 41 forms a total of four grooves 44, and the fourth inner diameter d4 is the distance between the abutting portions 431 of the two second pins 43. The fixing hole 42 is sleeved on the joint portion 17 of the receiving member 10 , and the abutting portion 431 of the second leg 43 of the inner peripheral edge 41 abuts against the metal shaft 301 . The second pin 43 of the inner peripheral edge 41 can be reliably abutted against the metal shaft 301 by the characteristic that the second pin 43 can be bent, thereby generating electrical conduction.

The joint portion 17 is disposed in the fixing hole 22 of the first guiding member 20, the fixing hole 33 of the resistor member 30 and the fixing hole 42 of the second guiding member 40. The joint portion 17 can prevent the first guiding member 20 from being removed. The resistor member 30 and the second guide member 40 are separated from the receiving member 10.

The metal shaft 301 is disposed through the through hole 15, the hole 23 of the first guide 20, the hole 34 of the resistor 30, and the inner periphery 41.

The third outer diameter D3 is smaller than the second outer diameter D2, and the fourth outer diameter D4 is smaller than the second outer diameter D2. In the embodiment, the fourth outer diameter D4 is smaller than the first outer diameter D1 is smaller than the second outer diameter D1. The outer diameter D2, when the conductive device 1 is mounted on the photosensitive drum 2, the receiving member 10 is tightly mounted on the photosensitive drum 2, and ensures that the conductive device 1 has only the outer periphery 21 of the first guiding member 20 and The photosensitive drum 2 is electrically turned on.

The fourth inner diameter d4 is smaller than the first inner diameter d1, the second inner diameter d2, and the third inner diameter d3. In the embodiment, the fourth inner diameter d4 is smaller than the first inner diameter d1 and smaller than the third inner diameter. The diameter d3, when the conductive device 1 is mounted on the photosensitive drum 3, ensures that the conductive device 1 has only the inner periphery 41 of the second guide 40 electrically connected to the metal shaft 301.

When the metal shaft 301 is energized, current is transmitted from the metal shaft 301 to the second guide 40, and the second guide 40 transmits current to the resistor 30, and the resistor 30 transmits current to the first guide 20. And transmitted to the photosensitive drum 2, the resistor member 30 provides an impedance such that the current flowing through the first guide member 20 is smaller than the current of the second guide member 40.

By increasing the resistance member 30, the magnitude of the current can be controlled. When the current conducted by the conductive device 1 has an impedance, the conductive device 1 provides an appropriate impedance capability, and the impedance of the photosensitive drum 2 due to the use of a period of time is improved. The ability to reduce the ability to provide the required printing capabilities. Moreover, the cost of the conductive device 1 is much lower than the cost of the photosensitive drum 2. Even when the conductive device 1 is worn out, the user can replace the less expensive conductive device 1 to save the printing cost.

As far as the above is concerned, it can be concluded that the present invention has the following advantages:

1. The "conductive device of the photosensitive drum" of the present invention, the conductive device having the effect of controlling the magnitude of the current, the conductive device directly providing an appropriate impedance capability, and capable of avoiding excessive leakage current. Since the photosensitive drum has a plurality of coating layers, the coating layer belongs to a coating film mixture, which is a non-uniform material, and the coating film of the coating layer absorbs water, and the electric resistance value becomes low, resulting in deterioration of insulation and electric leakage. The conductive device of the present invention provides a uniform resistance value, and the impedance is not affected by changes in temperature and humidity, so that the conductive device is not affected by the coating 瑕疵 of the photosensitive drum, and is not affected by the ambient temperature and humidity, and can improve the quality of the conventional photosensitive drum. The lack of control is not easy. Moreover, the conductive device can avoid the breakdown problem of the photosensitive drum, and the resistance value of the conductive device has no local low impedance and the large current breakdown is lost. The conductive device of the present invention does provide the printing capability that meets the requirements.

2. The "conductive device of the photosensitive drum" of the present invention, which has an impedance capability for the flow of current, the resistor member can prevent the photosensitive drum from being subjected to a large current and the breakdown of the breakdown, and can avoid the occurrence of a short circuit.

3. The "conductive device of the photosensitive drum" of the present invention, the cost of the conductive device is much lower than the cost of the photosensitive drum, and even if the conductive device is worn out, the user can replace the cheaper conductive device to save printing The cost of the effect.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, so that the numerical value is changed or the equivalent element is replaced, or the equivalent of the scope of the patent application of the present invention. Changes and modifications are still within the scope of the invention patent.

1. . . Conductive device

10. . . Receiving piece

101. . . First end

102. . . Second end

11. . . Tight edge

12. . . Crate

13. . . Flange

14. . . Tooth

15. . . perforation

16. . . Mounting surface

17. . . combination

D1. . . First outer diameter

D1. . . First inner diameter

20. . . First guide

twenty one. . . Peripheral periphery

twenty two. . . Fixed hole

twenty three. . . Hole

twenty four. . . First pin

D2. . . Second outer diameter

D2. . . Second inner diameter

30. . . Resistor

31. . . First side

32. . . Second side

33. . . Fixed hole

34. . . Hole

D3. . . Third outer diameter

D3. . . Third inner diameter

40. . . Second guide

41. . . Inner circumference

42. . . Fixed hole

43. . . Second pin

431. . . Conflicting part

44. . . Groove

D4. . . Fourth outer diameter

D4. . . Fourth inner diameter

2. . . Photosensitive drum

3. . . Photosensitive drum

301. . . Metal shaft

Figure 1 is a perspective view of the photosensitive drum, photosensitive drum and conductive device of the present invention.

Figure 2 is an exploded perspective view of the photosensitive drum, photosensitive drum and conductive device of the present invention.

Figure 3 is a cross-sectional view showing a photosensitive drum, a photosensitive drum, and a conductive device of the present invention.

Figure 4 is a perspective view of the conductive device of the present invention.

Figure 5 is an exploded perspective view of the conductive device of the present invention.

Figure 6 is a cross-sectional view of the conductive device of the present invention taken along line 6-6 of Figure 4.

Figure 7 is an enlarged view of a detail of the present invention taken from Figure 6.

Figure 8 is a cross-sectional view of the conductive device of the present invention taken along line 8-8 of Figure 4.

1. . . Conductive device

10. . . Receiving piece

101. . . First end

102. . . Second end

11. . . Tight edge

12. . . Crate

13. . . Flange

14. . . Tooth

15. . . perforation

16. . . Mounting surface

17. . . combination

20. . . First guide

twenty one. . . Peripheral periphery

twenty two. . . Fixed hole

twenty three. . . Hole

twenty four. . . First pin

30. . . Resistor

31. . . First side

32. . . Second side

33. . . Fixed hole

34. . . Hole

40. . . Second guide

41. . . Inner circumference

42. . . Fixed hole

43. . . Second pin

431. . . Conflicting part

44. . . Groove

Claims (10)

A conductive device for a photosensitive drum, comprising: a receiving member coupled to the photosensitive drum, the receiving member is axially provided with a through hole, the metal shaft of the photosensitive drum is disposed through the through hole; and a first guiding member The first guide member includes an outer peripheral edge and a bore, the outer peripheral edge abuts against the inner edge of the photosensitive drum, and the metal shaft of the photosensitive drum passes through the bore of the first guide member; a resistor member having opposite first and second faces, the resistor member includes a hole, the first surface of the resistor member electrically conducting the first guide member, and the metal shaft of the photosensitive drum is disposed a hole of the resistor member; a second guiding member electrically conducting the second surface of the resistor member, the second guiding member comprising an inner periphery, the inner peripheral edge abutting against the metal shaft of the photosensitive drum. The conductive device of the photosensitive drum according to claim 1, wherein the through hole of the receiving member has a first inner diameter, the hole of the first guiding member has a second inner diameter, and the hole of the resisting member has a first a third inner diameter having a fourth inner diameter smaller than the first inner diameter, the second inner diameter, and the third inner diameter, when the conductive device is mounted on the photosensitive drum The conductive device is electrically connected to the metal shaft only by the inner circumference of the second guide. The conductive device of the photosensitive drum of claim 2, wherein the third inner diameter is equal to the second inner diameter, and the fourth inner diameter is smaller than the first inner diameter than the third inner diameter. The conductive device of the photosensitive drum of claim 1, wherein the outer edge of the receiving member comprises a pressing edge, the pressing edge has a first outer diameter, and the first outer diameter of the pressing edge is equal to the photosensitive drum Inner edge. The conductive device of the photosensitive drum of claim 1, wherein the outer periphery has a second outer diameter, the second outer diameter is the longest distance of the outer circumference, and the resistor has a third outer diameter. The two guide members have a fourth outer diameter that is smaller than the second outer diameter, and the fourth outer diameter is also smaller than the second outer diameter. The conductive device of the photosensitive drum of claim 5, wherein the third outer diameter is equal to the fourth outer diameter. The conductive device of the photosensitive drum according to any one of claims 1 to 6, wherein the outer periphery protrudes from at least one first pin, and the first leg of the outer periphery abuts against the inner edge of the photosensitive drum. The conductive device of the photosensitive drum according to claim 7, wherein the outer edge of the receiving member comprises a receiving groove, and the first pin is bent to be accommodated in the receiving groove of the receiving member. The conductive device of the photosensitive drum of claim 7, wherein the inner periphery protrudes from at least one second pin, and the inner periphery forms at least two grooves, and the second pin is located in the two grooves The effect of the second pin being bendable is provided by the groove, and the end of the second pin further forms an abutting portion which can be abutted against the metal shaft. The conductive device of the photosensitive drum of claim 1, wherein the outer edge of the receiving member comprises a flange, the flange is disposed at an end surface of the photosensitive drum, and an end surface of one end of the receiving member forms an attaching surface, and the outer surface of the receiving member a plurality of joints are formed on the surface, the first guide comprises a plurality of fixing holes, the resistor component comprises a plurality of fixing holes, the second guiding component comprises a plurality of fixing holes, and the coupling portion is disposed on the first portion a fixing hole of a guiding member, a fixing hole of the resistor member and a fixing hole of the second guiding member, the coupling portion can prevent the first guiding member, the resistor member and the second guiding member from being disengaged from the receiving member.