KR101921295B1 - Apparatus for manufacturing rechargeable battery - Google Patents

Abstract

A secondary battery manufacturing apparatus according to the present invention is provided with a plurality of encoders for winding the positive electrode plate, the negative electrode plate and the separator and detecting the supply lengths of the positive electrode plate, the negative electrode plate and the separator, A transfer unit for supporting the pressure roller and transferring the pressure roller toward the encoder so as to frictionally press the pressure subject passing between the encoder and the pressure roller against the encoder and a support for supporting the transfer unit, It is possible to accurately detect the supply length of the electrode plate and the separation membrane and precisely cut the length of the electrode plate and the separation membrane, thereby improving the quality of the secondary battery.

Description

[0001] APPARATUS FOR MANUFACTURING RECHARGEABLE BATTERY [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery manufacturing apparatus, and more particularly, to a secondary battery manufacturing apparatus for guiding a positive electrode plate, a negative electrode plate, and a separator to a winding machine and winding a battery to produce a positive electrode plate, a negative electrode plate and a separator in the form of a jellyroll.

Generally, a secondary battery is a battery which can be repeatedly used through a discharge process of converting chemical energy into electrical energy and a charging process in the reverse direction. Examples of the secondary battery include a nickel-cadmium (Ni-Cd) battery, a nickel- A lithium-metal battery, a lithium-ion (Ni-Ion) battery, and a lithium-ion polymer battery (hereinafter referred to as " LIPB ").

The secondary battery is composed of an anode, a cathode, an electrolyte, and a separator, and stores and generates electricity using voltage difference between different anode and cathode materials. Here, the discharge is to move electrons from a cathode having a high voltage to a cathode having a low voltage (generating electricity as much as the voltage difference of the anode), and charging means transferring the electrons again from the anode to the cathode where the anode material receives electrons and lithium ions And returned to the original metal oxide. That is, when the secondary battery is charged, the charge current flows as the metal atoms move from the anode to the cathode through the separator, and when discharged to the opposite side, the metal atoms move from the cathode to the anode and the discharge current flows.

BACKGROUND OF THE INVENTION [0002] Recently, secondary batteries have attracted attention as energy sources that are widely used in IT products, automobiles, and energy storage. In the field of IT products, secondary batteries can be used continuously for a long time, are required to be reduced in size and weight, and in the automobile field, they are required to have high output, durability, and stability for eliminating the risk of explosion. In the energy storage field, surplus power produced by wind power, solar power generation, and the like is stored. As it is used in a fixed type, a secondary battery of a more relaxed condition can be applied.

In particular, lithium secondary batteries have been in research and development since the early 1970s. Lithium ion batteries using carbon as a cathode instead of lithium metal have been developed and commercialized in 1990, and have been used for more than 500 cycles and short charging times of 1 to 2 hours It has the highest sales growth rate among secondary batteries and can be lightened by 30 ~ 40% less than nickel-hydrogen battery. In addition, the lithium secondary battery has the highest unit cell voltage (3.0 to 3.7 V) among the existing secondary batteries, has excellent energy density, and can have characteristics optimized for mobile devices.

Such a lithium secondary battery is generally classified into a liquid electrolyte cell and a polymer electrolyte cell depending on the type of the electrolyte. A battery using a liquid electrolyte is called a lithium ion battery, and a battery using a polymer electrolyte is called a lithium polymer battery. In addition, the exterior material of the lithium secondary battery can be formed into various types, and typical exterior materials include cylindrical, prismatic, pouch, and the like. Inside the casing of the lithium secondary battery, a positive electrode plate, a negative electrode plate, and a separator (separator) interposed therebetween are stacked or wound.

A secondary battery manufacturing apparatus for manufacturing such an electrode assembly includes a supply roller for supplying a positive electrode plate, a negative electrode plate and a separator, and a winding unit for winding the electrode plate. At this time, an encoder is provided between the feed roller and the winder to detect the length of the positive electrode plate, the negative electrode plate and the separator.

The secondary battery manufacturing apparatus including the encoders has already been disclosed in "Korean Registered Patent No. 1359430; System and Method for Making Lithium Ion Battery Jelly Roll for Electric Vehicles". According to the above-mentioned patent, the encoder is configured to span the pole plate, rotate according to the transport of the pole plate, and detect the length according to the number of rotations.

However, if the electrode plate is not properly rubbed against the roller connected to the encoder according to the tension of the electrode plate, or if the entire area of the electrode plate is not frictioned with the encoder uniformly, an error occurs in the number of revolutions of the encoder, There is a problem that a battery product is defective.

Korean Registered Patent No. 1359430 (Announcement of Mar. 10, 2014)

An object of the present invention is to provide a secondary battery manufacturing apparatus in which the entire area of the electrode plate and the separation membrane is uniformly contacted with an encoder for detecting the length of the electrode plate and the separation membrane.

A secondary battery manufacturing apparatus according to the present invention is provided with a plurality of encoders for winding the positive electrode plate, the negative electrode plate and the separator and detecting the supply lengths of the positive electrode plate, the negative electrode plate and the separator, A conveying unit for supporting the pressing roller and conveying the pressing roller toward the encoder to frictionally press the pressing object passing between the encoder and the pressing roller against the encoder, and a support for supporting the conveying unit.

The supporting base may be parallel to the encoder, and the secondary battery manufacturing apparatus may further include a supporting plate that supports the encoder and the supporting base together and is perpendicular to the supporting base.

The secondary battery manufacturing apparatus may further include a bracket coupled to the transfer unit and a position adjusting pin protruding toward the support from the bracket and seated on the support.

The position adjustment pins may be provided in plural such that the pressure roller maintains a parallel relationship with respect to the encoder.

The position adjustment pin may be slidably installed in the longitudinal direction of the support so as to align the center of the pressure roller with respect to the center of the encoder.

The support base is provided with a plurality of positioning holes in the longitudinal direction, and the secondary battery manufacturing apparatus further includes a positioning pin which is engaged with at least one of the bracket and the plurality of positioning holes to maintain the position of the bracket can do.

The apparatus for manufacturing a secondary battery according to the present invention accurately detects the supply lengths of the electrode plates and separator by uniformly contacting the entire area of the electrode plate and the separator to the encoder for detecting the length of the electrode plates and separator, Therefore, it is possible to improve the quality of the secondary battery.

1 is a front view schematically showing a secondary battery manufacturing apparatus according to the present embodiment.
2 is a side view showing a part of a secondary battery manufacturing apparatus according to the present embodiment.
FIGS. 3 and 4 are perspective views of a part of the apparatus for manufacturing a secondary battery according to the present embodiment, viewed from different directions.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only examples of the present invention, and are not intended to represent all of the technical ideas of the present invention, so that various equivalents and modifications may be made thereto .

Hereinafter, an apparatus for manufacturing a secondary battery according to the present invention will be described with reference to the accompanying drawings.

1 is a front view schematically showing a secondary battery manufacturing apparatus according to the present embodiment.

Referring to FIG. 1, a secondary battery manufacturing apparatus 1 according to the present embodiment includes a first electrode plate supply unit 100, a second electrode plate supply unit 200, a first separation membrane supply unit 300, a second separation membrane supply unit 400, And a winding unit 500.

The first electrode plate supplying part 100 supplies the positive electrode plate 10 constituting the secondary battery. The first electrode plate supply unit 100 may include a first electrode plate spool 110 that supports the anode plate 10 in a roll form and allows the anode plate 10 to smoothly unwind. The second electrode plate supplying part 200 supplies the negative electrode plate 20 constituting the secondary battery. The second electrode plate supply unit 200 may include a second electrode plate spool 210 that supports the anode plate 20 in a roll form and allows the anode plate 20 to smoothly unwind.

The first separator feeder 300 supplies the first separator 30 to the cathode plate 10 to prevent the cathode plate 10 from being energized with the cathode plate 20. The first separation membrane supplying unit 300 may include a first separating membrane spool 310 that supports the first separating membrane 30 in a roll form and allows the first separating membrane 30 to be smoothly released. The second separation membrane feeder 400 supplies a second separation membrane 40 that prevents the cathode plate 20 from being energized with the anode plate 10. The second separation membrane feeder 400 may include a second separation membrane spool 410 that supports the second separation membrane 40 in a roll form and allows the second separation membrane 40 to be smoothly released.

The winding unit 500 may include at least one turret 510 for winding the positive electrode plate 10, the first separator 30, the negative electrode plate 20, and the second separator 40.

A pair of the positive electrode plate 10 and the first separator 30 are provided between the winding unit 500 and the first electrode plate feed unit 100 and between the winding unit 500 and the first separator feed unit 300, And a negative electrode plate 20 is disposed between the winding unit 500 and the second electrode plate feeding unit 200 and between the winding unit 500 and the second separating plate supplying unit 400. [ And a pair of second laminating rollers 620 for attaching the second separating film 40 to each other.

The positive electrode plate 10 and the first separating film 30 which are attached to each other between the winding unit 500 and the pair of first lapping rollers 610 are guided to the winding unit 500 and the positive electrode plate 10 and the first A first insert unit 630 for cutting the separation membrane 30 may be disposed. The negative electrode plate 20 and the second separating film 40 are guided to the winding unit 500 between the winding unit 500 and the pair of second lapping rollers 620 and the negative electrode plate 20 and the second A second insert unit 640 for cutting the separation membrane 40 may be disposed.

A first encoder 710 for detecting the supply length of the positive electrode plate 10 is disposed between the first electrode plate supply unit 100 and the pair of first lapping rollers 610, A second encoder 720 for detecting the supply length of the negative electrode plate 20 may be disposed between the pair of second coiling rollers 620 and the pair of second coiling rollers 620.

A third encoder 730 for detecting the supply length of the first separation membrane 30 is disposed between the first separation membrane feeder 300 and the pair of first adhesion rollers 610, A fourth encoder 740 may be disposed between the first and second coalescing rollers 400 and 620 to detect the supply length of the second separation film 40.

The first electrode plate supplying unit 100, the second electrode plate supplying unit 200, the first separating film supplying unit 300, the second separating film supplying unit 400, the winding unit 500, the pair of first lapping rollers 610, A second insert unit 630, a second insert unit 640, a first encoder 710, a second encoder 720, a third encoder 730, and a fourth encoder 730. The first encoder unit 630, the second insert unit 630, (740) are all supported on the support plate (50).

In particular, all of the other components except for the first insert unit 630 and the second insert unit 640 include respective rotation shafts. In order to maintain the rotation shafts in parallel with each other, And it is preferable that they are vertically installed.

The secondary battery manufacturing apparatus 1 according to the present embodiment may include a first pressure roller 711, a second pressure roller 721, a third pressure roller 731 and a fourth pressure roller 741 have. The first pressure roller 711 rubs the positive electrode plate 10 to the first encoder 710. The second pressure roller 721 causes the negative electrode plate 20 to rub against the second encoder 720. The third pressure roller 731 rubs the first separator 30 to the third encoder 730. The fourth pressure roller 741 rubs the second separation membrane 40 to the fourth pressure roller 741.

The first pressing roller 711, the second pressing roller 721, the third pressing roller 731 and the fourth pressing roller 741 described above have a difference in the mounting position from the pressing object, (710, 720, 730, 740) to generate friction between the respective pressing objects and the respective encoders.

Therefore, only the configuration and operation of the first pressure roller 711 will be described for convenience of explanation, and the description of the first pressure roller 711 with respect to the remaining pressure rollers 721, 731, and 741 will be described It can be understood.

FIG. 2 is a side view showing a part of a secondary battery manufacturing apparatus according to the present embodiment, and FIGS. 3 and 4 are perspective views showing part of a secondary battery manufacturing apparatus according to this embodiment from different directions.

2 to 4, the apparatus for manufacturing a secondary battery 1 according to the present embodiment may include a first pressure roller 711, a first transfer unit 712, and a first support 713.

The first pressure roller 711 may be disposed on one side of the first encoder 710. The first pressure roller 711 may be provided in a pair so that the positive electrode plate 10 can be pressed by a plurality of portions of the first encoder 710. The pair of first pressure rollers 711 may be arranged to be symmetrical with respect to the center of the first encoder 710.

The first transfer unit 712 supports the first pressure roller 711. The first transfer unit 712 transfers the first pressure roller 711 toward the first encoder 710 so that the positive electrode plate 10 can be rubbed against the first encoder 710. The first transfer unit 712 may be provided with a linear actuator such as an oil / pneumatic cylinder or the like.

The first transfer unit 712 transfers the first pressure roller 711 toward the first encoder 710 and the first pressure roller 711 transfers the first pressure roller 711 to the first encoder 710 and the first pressure roller 711, The positive electrode plate 10 is pressed. Therefore, the positive electrode plate 10 can be rubbed against the first encoder 710 and the first pressure roller 711.

If the first pressure roller 711 is not parallel to the first encoder 710 and the center of the first pressure roller 711 is not aligned with the center of the first encoder 710, The positive electrode plate 10 that is rubbed against the first encoder 710 is smoothly conveyed, and an error may occur in the number of revolutions of the first encoder 710.

Therefore, the secondary battery manufacturing apparatus 1 according to the present embodiment is structured such that the first pressure roller 711 is kept parallel to the first encoder 710, the center of the first pressure roller 711 is in contact with the first encoder 710, As shown in FIG.

To this end, the first support 713 is installed perpendicular to the support plate 50 and supports the first transfer unit 712. The first encoder 710 is orthogonal to the support plate 50 and the first support 713 is orthogonal to the support plate 50 as described above. The first transfer unit 712 is supported by the first support 713 and the first pressure roller 711 is supported by the first transfer unit 712. As a result, 710).

At this time, for convenience of adjusting the position of the first transfer unit 712 supporting the first pressure roller 711, the first transfer unit 712 is fastened to the first bracket 714, 714 may be provided with a first position adjusting pin 715. The first positioning pin 715 protrudes from the first bracket 714 toward the first support 713. The plurality of first positioning pins 715 are seated on the upper surface of the first support 713.

In order to maintain the first pressing roller 711 in parallel relation with the first encoder 710 only by placing the first position adjusting pin 715 on the upper surface of the first supporting table 713, It is preferable that a plurality of pins 715 are provided.

The first position adjusting pin 715 can easily move the first bracket 714 fastened to the first transfer unit 712 in the longitudinal direction of the first support 713 to be moved in the center of the first encoder 710 The first pressing roller 711 may be slidable in the longitudinal direction of the first supporting base 713 so that the central portion of the first pressing roller 711 can be aligned.

A plurality of first positioning holes 716 are formed in the first support 713 and at least one first positioning hole 716 is formed in the first bracket 714, The positioning pin 717 can be fastened. After the first pressure roller 711 is parallel to the first encoder 710 and the central portion of the first pressure roller 711 is aligned with the center of the first encoder 710 as described above, By fastening the positioning pin 717 to any one of the plurality of first positioning holes 716, the position of the first pressing roller 711 can be firmly maintained.

As described above, the apparatus for manufacturing a secondary battery 1 according to the present embodiment has a structure in which the first support 713 is orthogonalized to the support plate 50 and the plurality of first position adjustment pins 715 are placed on the first support 713 The first pressing roller 711 can be installed parallel to the first encoder 710 and the first pressing roller 711 can be easily moved in the longitudinal direction of the first supporting table 713, The center of the first pressing roller 711 can be aligned with the center of the first pressing roller 711. [

In order to simplify the explanation, in the above description, the parallelism of the first pressure roller 711 is easily maintained with respect to the first encoder 710, and the central portion of the first pressure roller 711 is positioned at the center of the first encoder 710 The first support 713 and the plurality of first position adjustment pins 715 will be described with a structure for easily aligning the first pressure roller 711 and the first pressure roller 711. In addition, Only the one positioning hole 716 and the first positioning pin 717 are described.

The secondary battery manufacturing apparatus 1 according to the present embodiment is provided with second, third and fourth pressure rollers 721, 731, and 720 for the second, third and fourth encoders 720, 730, and 740, 741 in order to easily align the center of the second, third and fourth pressure rollers 721, 731 and 741 with the center of the second, third and fourth encoders 720, 730 and 740, Third, and fourth pressing rollers 721, 731, and 741, respectively, and second, third, and fourth position adjusting pins 725, 735, and 745, Third, and fourth positioning holes 726, 736, and 746 and second, third, and fourth positioning pins 727, 737, and 747 can be configured to firmly maintain the positions of the first, second, .

The second, third, and fourth positioning holes 726, 736, and 734 are formed in the second, third, and fourth support rods 723, 733, and 743, the second, third and fourth positioning pins 725, 735, and 745, 746 and the second, third and fourth positioning pins 727, 737 and 747 are connected to the first support 713, the plurality of first positioning pins 715, the plurality of first positioning holes 716 And the first positioning pin 717, the detailed description thereof will be omitted.

Hereinafter, the operation of the secondary battery manufacturing apparatus according to the present embodiment will be described with reference to the accompanying drawings.

First, the operator aligns the positions of the pressure rollers 711, 721, 731, and 741 with respect to the encoders 710, 720, 730, and 740 before starting the secondary battery manufacturing process.

That is, the operator inserts the second transfer unit 722, which fastens the first transfer unit 712 supporting the first pressure roller 711 to the first bracket 714 and supports the second pressure roller 721, A fourth conveying unit 730 which is fastened to the second bracket 724 and fastens the third conveying unit 732 supporting the third pressing roller 731 to the third bracket 734 and supports the fourth pressing roller 741, (742) to the fourth bracket (744).

Subsequently, the operator clamps a plurality of first position adjustment pins 715 to the first bracket 714, fixes a plurality of second position adjustment pins 725 to the second bracket 724, The plurality of third positioning pins 735 are fastened to the first brackets 734 and the plurality of fourth positioning pins 745 are fastened to the fourth brackets 744. [

Subsequently, the operator places the plurality of first positioning pins 715 on the first support 713, places the plurality of second positioning pins 725 on the second support 723, The three position adjustment pins 735 are seated on the third support 733 and the plurality of fourth position adjustment pins 745 are seated on the fourth support 743. [

Subsequently, the operator transfers the first bracket 714 in the longitudinal direction of the first support 713, aligns the central portion of the first pressure roller 711 at the center of the first encoder 710, and aligns the center of the second bracket 724 Is aligned with the central portion of the second pressure roller 721 at the center of the second encoder 720 and the third bracket 734 is aligned with the center of the third support frame 733 The central portion of the third pressing roller 731 is aligned with the center of the third encoder 730 and the fourth bracket 744 is transferred in the longitudinal direction of the fourth support 743 by the fourth encoder 740 The center of the fourth pressing roller 741 is aligned.

When the pressure rollers 711, 721, 731 and 741 for the respective encoders 710, 720, 730 and 740 are aligned as described above, the operator inserts the positioning pins (not shown) into the respective brackets 714, 724, 734 and 744 715, 725, 735, and 745 are tightened to maintain the positions of the pressure rollers 711, 721, 731, and 741.

 Then, the positive electrode plate 10, the negative electrode plate 20, the first separator 30 and the second separator 40 are wound around the winding unit 500 when the secondary battery manufacturing process is started.

That is, the positive electrode plate 10 passes between the first encoder 710 and the first pressure roller 711. At this time, the first conveying unit 712 conveys the first pressing roller 711 toward the first encoder 710. Therefore, the positive electrode plate 10 is pressed by the first pressure roller 711 and rubbed against the first encoder 710. The first encoder 710 is rotated as the positive electrode plate 10 is rubbed against the first encoder 710 and the first encoder 710 detects the supply length of the positive electrode plate 10.

At the same time, the first separation membrane 30 passes between the third encoder 730 and the third pressure roller 731. At this time, the third feeding unit 732 feeds the third pressing roller 731 toward the third encoder 730. Accordingly, the first separating film 30 is pressed by the third pressing roller 731 and rubbed against the third encoder 730. The third encoder 730 rotates as the first separator 30 rubs against the third encoder 730 and the third encoder 730 detects the feed length of the first separator 30.

At the same time, the negative electrode plate 20 passes between the second encoder 720 and the second pressure roller 721. At this time, the second conveying unit 722 conveys the second pressing roller 721 toward the second encoder 720. Therefore, the negative electrode plate 20 is pressed by the second pressure roller 721 and rubbed against the second encoder 720. The second encoder 720 is rotated as the negative electrode plate 20 rubs against the second encoder 720 and the second encoder 720 detects the supply length of the negative electrode plate 20.

At the same time, the second separation film 40 passes between the fourth encoder 740 and the fourth pressure roller 741. At this time, the fourth transfer unit 742 transfers the fourth pressing roller 741 toward the fourth encoder 740. [ Accordingly, the second separation membrane 40 is pressed by the fourth pressure roller 741 and rubbed against the fourth encoder 740. The fourth encoder 740 is rotated as the second separation membrane 40 is rubbed against the fourth encoder 740 and the fourth encoder 740 detects the feed length of the second separation membrane 40.

Subsequently, the positive electrode plate 10 and the first separating film 30 pass between the pair of first lapping rollers 610, and the negative electrode plate 20 and the second separating film 40 pass through a pair of second lapping rollers 620 ). The positive electrode plate 10 and the second separating film 40 are bonded together by a pair of first adhesion rollers 610 and the anode plate 20 and the second separator film 40 are bonded together by a pair of second adhesion rollers 620. [ do.

Subsequently, the bonded positive electrode plate 10 and the first separator 30 are guided to the winding unit 500 by the first insert unit 630, and the negative electrode plate 20 and the second separator 40, Is guided to the winding unit (500) by the two insert unit (640).

The first insert unit 630 refers to the length data of the positive electrode plate 10 and the first separator film 30 detected by the first encoder 710 and the third encoder 730, And the second insert unit 640 cuts the negative electrode plate 30 and the second separator film 40 by referring to the length data of the negative electrode plate 20 and the second separating film 40 detected by the second encoder 720 and the fourth encoder 740, (20) and the second separation membrane (40).

On the other hand, the positive electrode plate 10, the first separator 30, the negative electrode plate 20 and the second separator 40 are wound on the turret 510 and the positive electrode plate 10, 30, the cathode plate 20 and the second separation membrane 40 are taken out and formed into a jelly roll shape.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

1: Secondary battery manufacturing apparatus 10: Positive electrode plate
20: cathode plate 30: first separator
40: Second separation membrane 50: Support plate
100: First electrode plate supply part
200: second electrode plate supply unit 300: first separation membrane supply unit
400: Second separation membrane supplying part 500: Winding part
610: first lapping roller 620: second lapping roller
630: first insert unit 640: second insert unit
710: first encoder 711: first pressure roller
712: first transfer unit 713: first support
714: first bracket 715: first positioning pin
716: first positioning hole 717: first positioning pin
720: Second encoder 721: Second pressure roller
722: second transfer unit 723: second support
724: second bracket 725: second positioning pin
726: second positioning hole 727: second positioning pin
730: Third encoder 731: Third pressure roller
732: Third transfer unit 733: Third support
734: third bracket 735: third position adjusting pin
736: third positioning hole 737: third positioning pin
740: Fourth encoder 741: Fourth pressure roller
742: Fourth transfer unit 743: Fourth support
744: fourth bracket 745: fourth position adjusting pin
746: Fourth positioning hole 747: Fourth positioning pin

Claims (6)

A negative electrode plate, and a separator, and a plurality of encoders disposed respectively between the positive electrode plate, the negative electrode plate, and a supply portion for supplying the separator, each of which detects the supply length of the positive electrode plate, the negative electrode plate, In the secondary battery manufacturing apparatus,
A pressure roller disposed on one side of the encoder;
The pressing roller is supported by the pressing roller and the pressing roller is conveyed to the encoder so that a pressing object passing between the encoder and the pressing roller rubs against the encoder so that the entire area of the pressing object contacts the encoder uniformly A transfer unit
And a support for supporting the transfer unit. The method according to claim 1,
The support being parallel to the encoder,
Further comprising a support plate that supports the encoder and the support member and that is orthogonal to the support member. 3. The method of claim 2,
A bracket fastened to the transfer unit;
And a position adjusting pin projecting from the bracket toward the support frame and seated on the support frame. The method of claim 3,
Wherein the position regulating fins are provided in plural so that the pressure roller maintains a parallel relationship with respect to the encoder. The apparatus for manufacturing a secondary battery according to claim 3, wherein the position adjustment pin is slidably installed in the longitudinal direction of the support so as to align a central portion of the pressure roller with respect to a central portion of the encoder. The method of claim 3,
The supporting base is provided with a plurality of positioning holes in the longitudinal direction thereof,
And a positioning pin coupled to at least one of the bracket and the plurality of positioning holes to maintain the position of the bracket.

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