Friction coefficient adjusting device and glue uniformizing system

Abstract

According to the friction coefficient adjusting device and the glue uniformizing system, the glue uniformizing system comprises a glue uniformizing wheel which rotates to take away redundant glue liquid at a glue outlet and a glue scraping part which removes the glue liquid adhered to the periphery of the glue uniformizing wheel, and the friction coefficient adjusting device comprises a base for installing the glue scraping part and a damping linkage part; the damping linkage part is stressed to rotate and is in damping linkage with the base to rotate, then the glue scraping part is in linkage with the base to rotate with the base as the center, when the glue scraping part rotates to the position abutting against the glue uniformizing wheel, the damping linkage part stops rotating and is in linkage with the base to stop at the current position, and the friction coefficient adjusting assembly is in linkage with the base at the current position to move. The base is linked with the glue scraping part to move in the direction close to or away from the glue uniformizing wheel; when the glue uniformizing wheel rotates along the axis of the glue uniformizing wheel, the glue scraping part scrapes off glue liquid adhered to the peripheral surface of the glue uniformizing wheel, so that the glue uniformizing distance between the glue uniformizing wheel and the glue outlet is always kept within a set threshold value.

Description

TECHNICAL FIELD

[0001] The utility model relates to a glue uniform system, and further relates to a friction coefficient adjusting device applied to the glue uniform system. BACKGROUND

[0002] Before the glue coating system coats glue, the excess glue liquid adhered to the glue outlet needs to be removed.

[0003] In the prior art, the excess glue liquid at the glue outlet is first removed by rotating the glue uniform wheel, and then the glue liquid adhered to the outer periphery of the glue uniform wheel is removed by using a hand-held glue scraping piece, so that the glue uniform distance between the glue outlet and the glue uniform wheel is kept within a set threshold.

[0004] However, the hand-held glue scraping piece cannot control the friction coefficient between the glue scraping piece and the glue uniform wheel, and if the two abut too tightly, the glue scraping piece is easily abraded, and the rotation speed of the glue uniform wheel is easily affected, and if the two abut too loosely, the glue scraping effect is not good.

[0005] Based on the above reasons, there is an urgent need for a friction coefficient adjusting device to solve the above problems. CONTENT OF THE UTILITY MODEL

[0006] The utility model aims at overcoming the defects of the prior art, and provides a friction coefficient adjusting device and a glue uniform system comprising the same, wherein the friction coefficient adjusting device adjusts the friction coefficient between the glue scraping part and the glue uniform part to within a set threshold, so that the glue scraping part and the glue uniform wheel slide abut.

[0007] The utility model is implemented in the following manner: a friction coefficient adjusting device, wherein the glue uniform system comprises a glue uniform wheel for rotating to remove excess glue liquid at a glue outlet and a glue scraping part for removing glue liquid adhered to the outer periphery of the glue uniform wheel, and the friction coefficient adjusting device is used to adjust the friction coefficient between the glue scraping part and the glue uniform wheel, and the friction coefficient adjusting device comprises:

[0008] a base for being arranged in parallel and spaced apart from the glue uniform wheel and for driving the glue scraping part to rotate around the base as a center;

[0009] a damping linkage part for rotating under stress and damping the rotation of the base, and for stopping rotating and driving the base to stop at a current position when the glue scraping part rotates to a position abutting against the glue uniform wheel;

[0010] a friction coefficient adjusting assembly for driving the base at the current position to move, and for driving the glue scraping part to move towards or away from the glue uniform wheel, so as to adjust the friction coefficient between the glue uniform wheel and the glue scraping part to within a set threshold, thereby enabling the glue uniform wheel and the glue scraping part to slide abut.

[0011] Further, the friction coefficient adjusting device further comprises:

[0012] The engaging part is used to transmit the rotating torque outputted by the damping linkage part to the base, so that the base rotates at the transmitted rotating speed or the changed rotating speed linkage glue part, the engaging part includes a driving gear and a driven gear, the driven gear is fixedly connected with the base, and the driving gear is fixedly connected with the damping linkage part.

[0013] Further, the number of teeth of the driving gear and the driven gear is the same or different, wherein the number of teeth of the driving gear and the driven gear is the same, which is used to make the base rotate at a constant speed; the number of teeth of the driving gear is greater than that of the driven gear, which is used to increase the rotating speed of the base; the number of teeth of the driving gear is less than that of the driven gear, which is used to reduce the rotating speed of the base.

[0014] Further, the driven gear and the base are coaxially arranged or arranged off-center.

[0015] Further, the friction coefficient adjusting device further comprises a first vertical plate arranged at both ends of the base for supporting the base, and the base and the first vertical plate are rotationally connected, so that the base can rotate along the center line thereof.

[0016] Further, the friction coefficient adjusting device further comprises a bearing embedded in the two first vertical plates, the base has a rotating shaft at both ends, the middle part of the rotating shaft is embedded in the inner ring of the bearing, the driven gear is fixedly sleeved on the end part of the rotating shaft, and the damping linkage part has a power output shaft, and the driving gear is fixedly sleeved on the power output shaft.

[0017] Further, the friction coefficient adjusting device further comprises a second vertical plate for mounting the damping linkage part, and the first vertical plate and the second vertical plate are vertically spaced apart.

[0018] Further, the friction coefficient adjusting device further comprises a positioning member for fixedly limiting the base at the current position.

[0019] Further, the friction coefficient adjusting device further comprises a circumferential guide port, the positioning member is embedded in the circumferential guide port and rotates and translates along the axis of the positioning member, and is used to lock and fix the base and the first vertical plate at both ends of the positioning member.

[0020] Preferably, the cross section of the damping linkage part is circular, and the cross section of the base is square, when the damping linkage part links the base to stop at the current position, the vertical diameter of the damping linkage part is arranged corresponding to the connecting line between the two corners of the base.

[0021] Further, the friction coefficient adjusting assembly comprises a top surface connecting part fixedly connected with the base directly or indirectly and rotating with the base;

[0022] The top surface connecting part is arranged to rotate to be arranged opposite to the top surface of the first vertical plate supporting the base when the glue scraping part rotates to the position abutting against the glue distributing wheel.

[0023] A bolt for abutting against the top surface of the first vertical plate is screwed on the top surface connecting part, a circumferential torque in the first direction or the second direction is applied to the top surface connecting part to move the top surface connecting part up and down along the axis of the top surface connecting part, the distance between the top surface and the top surface connecting part can be expanded or reduced, and the friction coefficient between the glue distributing wheel and the glue scraping part is adjusted to be within the set threshold.

[0024] Further, the damping linkage part is provided with an anti-skid area arranged circumferentially along the damping linkage part.

[0025] The utility model also provides a kind of glue distributing system, including the glue distributing wheel for rotating and taking away excess glue liquid at glue outlet and the glue scraping part for removing glue liquid on the periphery of glue distributing wheel, further include the above-mentioned friction coefficient adjusting device for making the glue scraping part and glue distributing wheel between sliding abutment.

[0026] The utility model provides a kind of friction coefficient adjusting device and the glue distributing system containing friction coefficient adjusting device, glue distributing system includes the glue distributing wheel for rotating and taking away excess glue liquid at glue outlet and the glue scraping part for removing glue liquid on the periphery of glue distributing wheel, friction coefficient adjusting device is used for linkage glue scraping part rotates and moves towards glue distributing wheel, so that glue scraping part is in predetermined position and glue distributing wheel sliding abutment, this friction coefficient adjusting device includes the base for installing glue scraping part and damping linkage part, damping linkage part is rotated under stress and damps linkage base rotation, and then linkage glue scraping part rotates with base as center, when glue scraping part rotates to the position abutting against glue distributing wheel, damping linkage part stops rotating and linkage base stops in current position, friction coefficient adjusting assembly links the movement of current position base, base linkage glue scraping part moves towards the direction of close to or away from glue distributing wheel, for adjusting the friction coefficient between glue distributing wheel and glue scraping part to be within the set threshold, so that glue distributing wheel and glue scraping part between sliding abutment;When glue distributing wheel rotates along its axis, glue scraping part scrapes the glue liquid adhered to the periphery of glue distributing wheel, so that the glue distributing distance between glue distributing wheel and glue outlet always keeps within the set threshold, so that glue outlet has certain glue liquid amount, guarantee that the glue liquid amount that glue outlet is coated on semiconductor substrate is even and consistent with the glue liquid amount that is coated on semiconductor substrate later. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme of the present application, the drawings used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0028] Figure 1 is a structural diagram of the uniform glue system provided by the embodiments of the present application.

[0029] Figure 2 is a structure diagram of the rotation of the friction coefficient adjusting device linkage glue scraping part in the uniform glue system provided by the embodiments of the present application.

[0030] Figure 3 is a side view of the base in the friction coefficient adjusting device provided by the embodiments of the present application.

[0031] The implementation, functional characteristics and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings.

[0032] Among them, the sign explanation is as follows:

[0033] Glue outlet 10;

[0034] Uniform glue wheel 100;

[0035] Glue scraping part 200, glue scraping tip 210;

[0036] Base 300, rotating shaft 310, positioning member 320, circumferential guide port 330, connecting line 340;

[0037] Damping linkage part 400, fixed position 410, rotating position 420, anti-skid area 430;

[0038] Engaging part 500, driving gear 510, driven gear 520;

[0039] First vertical plate 600, front surface 610, top surface 620;

[0040] Bearing 700;

[0041] Second vertical plate 800;

[0042] Friction coefficient adjusting assembly 900, side surface connecting position 910, top surface connecting position 920, screw 930. DETAILED DESCRIPTION

[0043] In the utility model, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal" and the like indicate the orientation or state relationship based on the orientation or state relationship shown in the drawings. These terms are mainly used to better describe the utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0044] In addition to indicating the orientation or state relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the utility model can be understood according to the specific situation.

[0045] In addition, the terms "mounting", "setting", "provided with", "connection", "connected" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific situation.

[0046] In addition, the terms "first", "second" and the like are mainly used to distinguish different devices, elements or components, and the specific type and structure can be the same or different, and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0047] In order to clearly indicate the direction relationship in the drawing, a coordinate system with the vertical direction as the Z direction and the horizontal plane as the XY plane is appropriately marked.

[0048] The technical solutions in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model.

[0049] As shown in Figure 1 and Figure 2 The utility model discloses an even glue system, including even glue wheel 100 and scraping glue part 200 that are used for rotating and taking away the excess glue liquid of glue outlet 10, the scraping glue part 200 is used for removing the glue liquid adhered to the periphery of even glue wheel 100, still include friction coefficient adjusting device, and the friction coefficient adjusting device is used for adjusting the friction coefficient between scraping glue part 200 and even glue wheel 100.

[0050] Further, the friction coefficient adjusting device includes:

[0051] The base 300 is arranged in parallel with the glue wheel 100 at a spacing, and the glue scraping part 200 is connected to the base 300 in a detachable manner.

[0052] The damping linkage part 400 is forced to rotate and damp the rotation of the base 300. When the glue scraping part 200 rotates to the position abutting against the glue wheel 100, the damping linkage part 400 stops rotating and links the base 300 to stop at the current position.

[0053] The friction coefficient adjusting assembly 900 links the base 300 at the current position to move, and the base 300 links the glue scraping part 200 to move towards or away from the glue wheel 100, so as to adjust the friction coefficient between the glue wheel 100 and the glue scraping part 200 to be within a set threshold, thereby enabling the glue wheel 100 and the glue scraping part 200 to slide against each other. In the embodiment, the friction coefficient adjusting assembly 900 is vertically installed, and in the process of moving up and down, links the base 300 at the current position to move up and down. In another embodiment, the friction coefficient adjusting assembly 900 is horizontally installed, and links the base 300 at the current position to translate, which can also adjust the friction coefficient between the glue wheel 100 and the glue scraping part 200, only the installation position is different.

[0054] When the glue wheel 100 rotates along its axis, the glue scraping part 200 scrapes the glue adhered to the outer circumferential surface of the glue wheel 100, so that the glue uniformizing distance between the glue wheel 100 and the glue outlet 10 is always maintained within a set threshold, thereby enabling the glue outlet 10 to have a certain amount of glue, and ensuring that the amount of glue coated on the semiconductor substrate by the glue outlet 10 is uniform.

[0055] Further, the friction coefficient adjusting device further comprises:

[0056] The meshing part 500 is used to transmit the rotation torque output by the damping linkage part 400 to the base 300, so that the base 300 links the glue scraping part 200 to rotate smoothly at a transmission rotation speed or a changed rotation speed. The meshing part 500 comprises a driving gear 510 and a driven gear 520 which mesh with each other. The driven gear 520 is fixedly connected to the base 300, and the driving gear 510 is fixedly connected to the damping linkage part 400. After the driving gear 510 and the driven gear 520 mesh, they run smoothly, so that the power transmitted to the base 300 is stable and reliable.

[0057] Further, the number of teeth of the driving gear 510 and the driven gear 520 is the same or different. In the present embodiment, the number of teeth of the driving gear 510 and the driven gear 520 is the same, so that the base 300 can rotate at a constant speed. In another embodiment, the number of teeth of the driving gear 510 and the driven gear 520 can be different. For example, the number of teeth of the driving gear 510 is greater than that of the driven gear 520, so that the rotation speed of the base 300 can be increased. The number of teeth of the driving gear 510 is less than that of the driven gear 520, so that the rotation speed of the base 300 can be reduced, and the labor-saving effect can be achieved. The base 300 rotates at a constant speed or a reduced speed, so that it is convenient for the naked eye to determine whether the glue scraping part 200 and the glue distributing wheel 100 abut each other without a gap.

[0058] Further, the driven gear 520 and the base 300 are coaxially arranged or arranged off-center. Both arrangements can rotate the base 300 through the driven gear 520. When the base 300 rotates along the center line, the width of the base 300 can be increased, and the translation distance of the glue scraping part 200 relative to the base 300 can be reduced.

[0059] Further, the friction coefficient adjusting device further comprises first vertical plates 600 arranged at both ends of the base 300 for supporting the base 300. The base 300 and the first vertical plates 600 are rotationally connected, so that the base 300 can rotate along the center line.

[0060] Further, the friction coefficient adjusting device further comprises bearings 700 embedded in the two first vertical plates 600. The base 300 has rotating shafts 310 at both ends. The middle part of the rotating shaft 310 is embedded in the inner ring of the bearing 700. The driven gear 520 is fixedly arranged on the end part of the rotating shaft 310.

[0061] The damping linkage part 400 has a power output shaft. The driving gear 510 is fixedly arranged on the power output shaft. The base 300 and the damping linkage part 400 are transmissionally connected through the meshing part 500.

[0062] Further, the friction coefficient adjusting device further comprises second vertical plates 800 for mounting the damping linkage part 400. The first vertical plates 600 and the second vertical plates 800 are vertically and spacedly arranged. The driving gear 510 and the driven gear 520 are arranged between the first vertical plates 600 and the second vertical plates 800 from bottom to top. The layout is reasonable, and the internal space of the glue distributing system is saved.

[0063] Further, the damping linkage part 400 comprises a fixed position 410 fixedly connected with the second vertical plate 800 and a rotating position 420 rotationally connected with the fixed position 410. The rotating position 420 is coaxially and fixedly connected with the driving gear 510.

[0064] Further, the friction coefficient adjusting device further comprises a positioning member 320 for fixing and limiting the base 300 at the current position.

[0065] Further, the friction coefficient adjusting device further comprises a circumferential guide hole 330 which is rotatable around the base 300 and can be displaced relative to the first vertical plate 600, and the positioning member 320 is arranged in the circumferential guide hole 330 and is rotatable and translatable along the axis of the positioning member 320, so as to lock and fix the base 300 at both ends of the positioning member 320 and the first vertical plate 600. In this embodiment, the circumferential guide hole 330 is an arc-shaped waist-shaped slot.

[0066] Preferably, the circumferential guide hole 330 is arranged on both ends of the base 300 in the length direction and faces the two first vertical plates 600, and the positioning member 320 is arranged in the circumferential guide hole 330 and is screwed with the first vertical plate 600, so as to fix and limit the base 300. In this embodiment, the positioning member 320 is preferably a bolt, which can fix the base 300 rotated to the set position on the first vertical plate 600 by screw connection, and is convenient to disassemble and assemble.

[0067] Further, the friction coefficient adjusting device further comprises a friction coefficient adjusting assembly 900 for adjusting the friction coefficient between the glue distributing wheel 100 and the glue scraping part 200. The friction coefficient adjusting assembly 900 comprises a side surface connecting part 910 which is detachably and fixedly arranged on one end or both ends of the base 300 and corresponds to the front surface 610 of one first vertical plate 600 or both first vertical plates 600, and a top surface connecting part 920 which is fixedly connected with the side surface connecting part 910. When the glue scraping part 200 rotates with the base 300 to the position abutting against the glue distributing wheel 100, the top surface connecting part 920 rotates to be arranged opposite to the top surface 620 of the first vertical plate 600. A bolt 930 is screwed on the top surface connecting part 920 and abuts against the top surface 620 of the first vertical plate 600. A circumferential torque in a first direction or a second direction is applied to the bolt 930, so as to move the top surface connecting part 920 up and down along the axis of the bolt 930, expand or reduce the distance between the top surface 620 and the top surface connecting part 920, and then move the glue scraping part 200 up and down (e.g. upward or downward) along the Z direction, so as to adjust the friction coefficient between the glue distributing wheel 100 and the glue scraping part 200 to be within the preset parameters, i.e. adjust the glue scraping part 200 to be in the sliding abutting state with the glue distributing wheel 100, and facilitate the glue scraping part 200 to scrape the glue adhered to the outer periphery of the glue distributing wheel 100. The first direction and the second direction are opposite directions.

[0068] In this embodiment, preferably, the top surface connection position 920 is arranged parallel to the top surface 620 of the first vertical plate 600, which avoids the phenomenon of the inclined top surface connection position 920 colliding with the parallel top surface 620 during the displacement process, and expands the displacement distance between the top surface connection position 920 and the top surface 620 of the first vertical plate 600.

[0069] Preferably, there are two friction coefficient adjustment components 900, which are respectively disposed at both ends of the base 300. The two side connection positions 910 are respectively sleeved on the rotating shafts 310 at both ends of the base 300 and are detachably fixedly connected to the base 300. In this embodiment, the detachable fixed connection is a threaded connection, which is convenient for disassembly and assembly.

[0070] In this embodiment, the circumferential guide opening 330 is arranged on the side connection position 910. In another embodiment, the circumferential guide opening 330 can also be set on the first upright plate 600, and the positioning member 320 passes through the circumferential guide opening 330 and is screwed to the base 300. Here, the installation position of the circumferential guide opening 330 on the base 300 or the first upright plate 600 can be interchanged and is not restricted. Both can achieve mutual locking and fixation between the base 300 and the first upright plate 600.

[0071] Furthermore, the damping linkage 400 is provided with an anti-slip area 410, which is arranged circumferentially along the damping linkage 400. The anti-slip area 410 has an anti-slip function, making it convenient for the operator to rotate and operate the damping linkage 400.

[0072] like Figures 1-3 As shown, preferably, the cross-section of the damping linkage part 400 is circular and the cross-section of the base 300 is square. When the damping linkage part 400 stops in the current position with the base 300 linked to it, the vertical diameter D1 of the damping linkage part 400 and the connecting line 340 between the two corners of the base 300 are coplanar. This design allows the scraping part 200 installed on the side of the base 300 to be inclined relative to the horizontal diameter D of the glue-spreading wheel 100, preferably at 45°, so that the scraping tip 210 on the scraping part 200 is at the optimal scraping angle.

[0073] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A friction coefficient adjusting device, applied in a spin coating system, the spin coating system comprising a spin coating wheel for rotating the belt to remove excess adhesive at the outlet and a scraping part, the scraping part being used to remove adhesive adhering to the outer circumference of the spin coating wheel, characterized in that, The friction coefficient adjusting device is used for adjusting the friction coefficient between the glue scraping part and the glue distributing wheel, and comprises: a base, which is arranged in parallel with the glue distributing wheel, and links the glue scraping part to rotate around the base; a damping linkage part, which rotates under force and links the base to rotate with damping, and stops rotating and links the base to stop at a current position when the glue scraping part rotates to a position abutting against the glue distributing wheel; a friction coefficient adjusting assembly, which links the base at the current position to move, and links the glue scraping part to move towards or away from the glue distributing wheel, so as to adjust the friction coefficient between the glue distributing wheel and the glue scraping part to be within a set threshold, and to make the glue distributing wheel and the glue scraping part slide against each other.

2. The coefficient of friction adjustment device of claim 1, wherein, comprises: an engaging part, which transmits the rotating torque output by the damping linkage part to the base, so that the base rotates the glue scraping part at a transmitted rotating speed or a changed rotating speed.

3. The coefficient of friction adjustment device of claim 2, wherein, The engaging part comprises a driving gear and a driven gear which engage with each other, the driven gear is detachably fixedly connected with the base, and the driving gear is detachably fixedly connected with the damping linkage part.

4. The coefficient of friction adjustment device of claim 3, wherein, The number of teeth of the driving gear and the driven gear is the same or different; wherein the number of teeth of the driving gear and the driven gear is the same, so that the base rotates at a constant speed; or the number of teeth of the driving gear is greater than that of the driven gear, so as to increase the rotating speed of the base; or the number of teeth of the driving gear is less than that of the driven gear, so as to reduce the rotating speed of the base.

5. The coefficient of friction adjustment device of claim 3, wherein, The driven gear and the base are coaxially arranged or arranged with an eccentric shaft.

6. The coefficient of friction adjustment device of claim 3, wherein, It comprises first vertical plates arranged at both ends of the base respectively to support the base, and the base and the first vertical plates are rotationally matched, so that the base can rotate along the center line thereof.

7. The coefficient of friction adjustment device of claim 6, wherein, It comprises bearings respectively embedded in the two first vertical plates, and the base has rotating shafts at both ends, the middle parts of the rotating shafts are respectively embedded in the inner rings of the bearings, and the driven gear is fixedly sleeved on the end parts of the rotating shafts; The damping linkage part has a power output shaft, and the driving gear is fixedly sleeved on the power output shaft.

8. The coefficient of friction adjustment device of claim 6, wherein, comprises: a positioning member, which is used for fixing and limiting the base at the current position; a circumferential guide port, in which the positioning member is arranged and rotates and translates along the axis of the positioning member, so as to lock and fix the base and the first vertical plate at both ends of the positioning member.

9. The coefficient of friction adjustment device of claim 1, wherein, The friction coefficient adjusting assembly comprises a top surface connecting position which is directly or indirectly fixedly connected with the base and rotates with the base; When the glue scraping part rotates with the base to the position abutting against the glue distributing wheel, the top surface connecting position is arranged to rotate to be opposite to the top surface of the first vertical plate supporting the base; A top position bolt is screwed on the top surface connecting position and abuts against the top surface of the first vertical plate, a circumferential torque in a first direction or a second direction is applied to the top position bolt, the top surface connecting position moves up and down along the axis of the top position bolt, so as to expand or reduce the distance between the top surface and the top surface connecting position, and further adjust the friction coefficient between the glue distributing wheel and the glue scraping part to be within a set threshold. The first direction and the second direction are opposite directions.

10. An even coating system characterized by, The device comprises a glue uniformizing wheel for rotating to take away the excess glue liquid at the glue outlet, a glue scraping part for removing the glue liquid on the outer periphery of the glue uniformizing wheel, and the coefficient of friction adjusting device for making the glue scraping part and the glue uniformizing wheel slide and abut against each other according to any one of the above claims 1 to 9.

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