A crease device used in mask production line

Abstract

The present invention relates to the field of mask production equipment, and in particular to a crease device applied to a mask production line, comprising an initial folding mechanism and a fine folding mechanism arranged in sequence along the conveying direction of the mask surface. The initial folding mechanism comprises a second base and an initial folding roller, the second base is provided with two initial folding rollers, one of which is rotatably connected to the second base, and the other initial folding roller moves relative to a fixed axis. The fine folding mechanism comprises a first base, an annular seat and a fine folding block, the annular seat is rotatably fixed to the first base, and two fine folding blocks are also provided in the annular seat, and the two fine folding blocks move along the same diameter line of the annular seat and move relative to the center of the annular seat. The end face of the fine folding block facing the center of the annular seat is provided with a plurality of raised folding teeth, and the depression formed between two adjacent folding teeth is a folding groove, the folding teeth of the two fine folding blocks are staggered with each other, so that the folding teeth of one fine folding block are embedded in the folding groove of the other fine folding block.

Description

Technical Field

[0001] The invention relates to the field of mask production equipment, and in particular to a crease device applied to a mask production line. Background Art

[0002] The masks are mostly rectangular, with folds in the middle so that when the masks are worn, the folds can be stretched out to make the masks present an arc surface, which is convenient for fitting the wearer's facial contour. The folds of adult masks form deeper creases, so that the masks present a larger arc surface after the folds are stretched out; while the folds of children's masks form shallower creases, so that the masks present a smaller arc surface after the folds are stretched out.

[0003] At present, the production process of wrinkles on masks generally includes two processes: initial folding and fine folding. Most mask production lines use roller initial folding and flat plate fine folding to complete the two processes. The roller is provided with a number of cloth pressing truncated tables extending away from the central axis of the roller. The outer circular contour of the large end of the cloth pressing truncated table is connected with the cloth, so that the cloth changes from the original flat state to an uneven state, that is, the initial folding is completed; after the cloth with an uneven surface moves to the flat plate, the flat plate extends from both sides to the central axis of the cloth, just against the part of the cloth that is pressed out of the depression, and after deepening the crease, the fine folding is completed, and the wrinkle processing is completed; finally, it is flattened and rolled up by the pressing roller.

[0004] However, in the current production line, in the way wrinkles are formed, the rollers and the pressing plate are fixed structures, and it is impossible to produce fabrics with wrinkles of different depths, that is, it is impossible to adjust the crease depth of the fabric wrinkles according to actual production needs. Summary of the invention

[0005] In view of the deficiencies raised by the above-mentioned background technology, the present invention provides a crease device applied to a mask production line to overcome the problem that the existing mask production line cannot adjust the crease depth of fabric wrinkles.

[0006] The present invention adopts the following technical scheme: a folding device applied to a mask production line, characterized in that it comprises a primary folding mechanism and a fine folding mechanism sequentially arranged along the conveying direction of the mask surface,

[0007] The initial folding mechanism comprises a second base and an initial folding roller, wherein the second base is provided with two initial folding rollers, wherein one initial folding roller is rotatably connected to the second base, and the other initial folding roller moves relative to a fixed shaft; a plurality of conical protrusions are sequentially provided on the surface of the initial folding roller along its axial direction, and the conical protrusions of the two initial folding rollers are meshed with each other and have a gap;

[0008] The fine-folding mechanism includes a first base, an annular seat and a fine-folding block. The annular seat can be rotatably fixed on the first base. A clearance hole penetrating through the two end faces is provided in the center of the annular seat. Two fine-folding blocks are also provided in the annular seat, and the two fine-folding blocks move along the same diameter line of the annular seat and move relative to the clearance hole. The end face of the fine-folding block facing the center of the annular seat is provided with a plurality of raised folding teeth, and the depression formed between two adjacent folding teeth is a folding groove. The folding teeth of the two fine-folding blocks are staggered with each other, so that the folding teeth of one fine-folding block are embedded in the folding groove of the other fine-folding block, and the folding teeth and fold marks are both located in the clearance hole of the annular seat.

[0009] As a further improvement, the precision folding mechanism also includes an adjusting screw, and fixing pins are fixed on the outside of the end surfaces of the two precision folding blocks facing away from the folding teeth in the annular seat, and the fixing pins are provided with threaded holes adapted to the adjusting screws, and the adjusting screws spirally pass through the threaded holes to be rotatably connected to the precision folding blocks.

[0010] As a further improvement, a limiting sleeve is fixed on the end face of the fine folding block facing away from the folding teeth, and the end face of the limiting sleeve is provided with a through hole. A limiting ring is fixed at the end of the adjusting screw, and the adjusting screw passes through the through hole until the limiting ring is embedded in the limiting sleeve.

[0011] As a further improvement, a portion of the annular seat is embedded in the first base, and an arc-shaped rotating hole is provided on the side of the first base; a plurality of positioning holes are provided on the end face of the annular seat, and the positioning holes are threaded holes, and the positioning holes are spirally connected with positioning screws, and the positioning screws are spirally connected to the positioning holes after passing through the rotating holes.

[0012] As a further improvement, two end faces of the annular seat are provided with two strip-shaped guide holes, and the center lines of the two guide holes on the same end face are located on the same diameter line of the annular seat, and guide blocks are fixed on both sides of the fine folding block, and the guide blocks on both sides of the fine folding block are respectively embedded in the corresponding guide holes at both ends of the annular seat.

[0013] As a further improvement, the annular seat includes two circular plates, a plurality of screws and a plurality of threaded sleeves. A plurality of mounting holes are distributed in a ring shape on the surface of the plate. Both ends of the threaded sleeve are provided with threaded holes threadedly connected to the screws. Each of the threaded sleeves is embedded between the two plates, and the threaded holes at both ends of the threaded sleeve correspond to the mounting holes of the plate respectively. The screws pass through the mounting holes of the plate and are spirally connected to the threaded holes of the threaded holes for fastening.

[0014] As a further improvement, the initial folding mechanism also includes a fixed shaft and an adjusting shaft, and the centers of the two initial folding rollers are respectively equipped with and fixed with the fixed shaft and the adjusting shaft; the fixed shaft can be rotatably fixed below the second base, and the adjusting shaft can move up and down relative to the fixed shaft.

[0015] As a further improvement, adjustment holes are provided on both sides of the second base, and the adjustment holes are vertical strip holes, and the adjustment holes are penetrated by adjustment bolts; both ends of the adjustment shaft are fixedly connected to the bearing seat, and the second base has limit plates fixed on both sides of the bearing seat; the adjustment holes correspond to the fixing holes of the bearing seat, and the adjustment bolts are threadedly connected with nuts after passing through the adjustment holes of the second base and the fixing holes of the bearing seat.

[0016] As a further improvement, the initial folding mechanism also includes a driving motor, the output shaft of the driving motor is transmission-connected to the fixed shaft, the fixed shaft and the adjusting shaft are both fixed with sprockets on the same side outside the second base, and the sprocket of the fixed shaft and the sprocket of the adjusting shaft are meshed and connected with the same chain.

[0017] As a further improvement, the initial folding mechanism also includes a slider, a tensioning sprocket and an elastic member, the tensioning sprocket is rotatably connected to the slider, and the tensioning sprocket is engaged with the chain, the slider is slidably connected to the side of the second base, and the elastic member is connected between the slider and the second base.

[0018] From the above description of the structure of the present invention, it can be seen that compared with the prior art, the present invention has the following advantages: the present invention includes an initial folding mechanism and a fine folding mechanism arranged in sequence along the conveying direction of the mask surface. The initial folding mechanism includes two initial folding rollers, one of which can move relative to the other initial folding roller, and the conical protrusions of the two initial folding rollers are meshed with each other and have a gap, which is used to pass the cloth, and the initial fold can be formed when the cloth passes through. During operation, by adjusting the distance between the two initial folding rollers, the gap formed by the conical protrusions of the two initial folding rollers can be adjusted, thereby adjusting the crease depth required for processing when the cloth is initially folded. The fine folding mechanism includes a first base, an annular seat and a fine folding block. Two fine folding blocks are embedded in the annular seat. The end surface of the fine folding block facing the annular seat is provided with a plurality of raised folding teeth, and the depression formed between two adjacent folding teeth is a folding groove. The folding teeth of the two fine folding blocks are staggered so that the folding teeth of one fine folding block are embedded in the folding groove of the other fine folding block, and there is a gap between the folding teeth and the folding groove, which is used to pass the cloth. When the cloth passes through, the required folding depth can be formed. During operation, by moving the distance between the two fine folding blocks relative to the center of the annular seat, the gap between the folding teeth and the folding groove between the two fine folding blocks can be changed, so as to adjust the crease depth required for processing when the cloth is finely folded. Through these two adjustment methods, the purpose of controlling the crease depth of the cloth is finally achieved, and the purpose of adjusting the crease depth of the cloth folds required for actual production on the same equipment is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention fixed on the frame of the production line.

[0020] Figure 2 It is a three-dimensional structural schematic diagram of the initial folding mechanism.

[0021] Figure 3 for Figure 2 A magnified schematic diagram of the center A direction.

[0022] Figure 4 It is a schematic cross-sectional view of the primary folding mechanism from the side.

[0023] Figure 5 for Figure 4 Enlarged schematic diagram of the B direction.

[0024] Figure 6 It is a three-dimensional structural schematic diagram of the fine folding mechanism.

[0025] Figure 7 This is a schematic diagram of the decomposition of the fine folding mechanism.

[0026] Figure 8 It is a side view schematic diagram of the fine folding mechanism.

[0027] Fig. 9 for Figure 8 Schematic diagram of the cross section along the C direction.

[0028] Fig.10 Schematic diagram of the three-dimensional structure of the fine folding block. DETAILED DESCRIPTION

[0029] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0030] As attached Figure 1 As shown, a crease device applied to a mask production line includes a primary folding mechanism 3 and a fine folding mechanism 2 which are sequentially arranged along the conveying direction of the mask surface.

[0031] As attached Figure 2 and 4 As shown, the initial folding mechanism 3 includes a second base 31, an initial folding roller 32, a fixed shaft 34, an adjusting shaft 33 and a driving motor 36. The surface of the initial folding roller 32 is sequentially provided with a plurality of conical protrusions 321 along its axial direction, and the second base 31 is provided with two initial folding rollers 32 from top to bottom, and the conical protrusions 321 of the two initial folding rollers 32 are meshed with each other and have a gap, which is used to pass the cloth, so that the flat cloth forms an uneven wavy structure under the extrusion of the end of the conical protrusion 321 after passing through, that is, the initial fold of the cloth is formed.

[0032] As attached Figure 4As shown, the primary folding mechanism 3 also includes a fixed shaft 34 and an adjusting shaft 33. The centers of the two primary folding rollers 32 are respectively fitted with and fixed with the fixed shaft 34 and the adjusting shaft 33. The primary folding rollers 32 and the fixed shaft 34 and the adjusting shaft 33 are fixed in a manner as shown in the attached figure. Figure 5 As shown, fixing rings 372 are embedded at both ends of the fixed shaft 34 and the adjusting shaft 33. A threaded hole extending through the center is provided on the side of the fixing ring 372. The threaded hole is screwed to a screw 371. During installation, the fixing ring 372 can be fixed by locking the screw 371 into the fixing ring 372 until it is tight against the fixed shaft 34 or the adjusting shaft 33. Thus, the initial folding roller 32 can be restricted and fixed by the fixing rings 372 on both sides. Furthermore, a key strip can be embedded between the initial folding roller and the fixed shaft 34 and the adjusting shaft 33 to ensure their synchronous rotation. The fixing shaft 34 can be rotatably fixed below the second base 31. Specifically, bearings (not shown) can be embedded in both sides of the second base 31. Both ends of the fixing shaft 34 pass through the bearings and are fixedly connected to the bearings. Referring to the attached Figure 2 and 3 As shown, both ends of the adjusting shaft 33 are fixedly connected to the bearing seat 35, and the two side walls of the second base 31 are fixed with limiting plates 311 on both sides of the bearing seat 35. The limiting plates 311 are used to limit the left and right sides of the bearing seat 35, so that the adjusting shaft 33 can only move up and down relative to the fixed shaft 34, that is, the initial folding roller 32 above the second base 31 can move up and down relative to the initial folding roller 32 below.

[0033] As attached Figure 6 and 7 As shown, both side walls of the second base 31 are also provided with adjustment holes 312, which are vertical strip holes and are both penetrated by adjustment bolts 352. The adjustment holes 312 also correspond to the fixing holes of the bearing seat 35 for installation, and the adjustment bolts 3522 are threadedly connected with nuts 351 after passing through the adjustment holes 312 of the second base 31 and the fixing holes of the bearing seat 35. When the upper primary folding roller 32 is moved upward or downward to adjust the gap between the two primary folding rollers 32, the nuts 351 and the adjustment bolts 352 are screwed and fastened, so that the bearing seat 35 can be fixed, so that the primary folding roller 32 above the second base 31 maintains a fixed gap relative to the primary folding roller 32 below, and then the gap between the conical protrusions 321 of the two primary folding rollers 32 can be adjusted, so as to facilitate the adjustment of the crease depth required for processing of different fabrics, thereby realizing the primary folding adjustment of the crease depth required for processing of the fabric.

[0034] As attached Figure 2 and 4As shown, the driving motor 36 is fixed on the frame 1 of the mask production line, and the output shaft of the driving motor 36 is connected to the fixed shaft 34 by transmission. The specific transmission method can be a direct fixed connection through a coupling, or a gear meshing connection. The fixed shaft 34 and the adjusting shaft 33 are fixed with a sprocket 361 on the same side outside the second base 31, and the sprocket 361 of the fixed shaft 34 and the sprocket 361 of the adjusting shaft 33 are meshed and connected with the same chain 363. The fixed shaft 34 drives the adjusting shaft 33 to rotate synchronously through the transmission method of this chain 363, that is, the two primary folding rollers 32 in the second base 31 rotate synchronously, so as to use the friction between the primary folding roller 32 and the cloth to drive the cloth to move, and avoid the cloth from being stuck between the two primary folding rollers 32.

[0035] Continue to refer to the attached Figure 2 and 4 The initial folding mechanism 3 further includes a slider 364, a tensioning sprocket 362 and an elastic member 365. The tensioning sprocket 362 is rotatably connected to the slider 364, and the tensioning sprocket 362 is engaged with the chain 363. The slider 364 is slidably connected to the side of the second base 31, and its sliding connection method is consistent with the method in which the bearing seat 35 connected to the adjustment shaft 33 moves on the second base 31. It can be that the limit plates 311 are fixed on both sides of the slider 364, or it can be that the guide rails adapted to the slider 364 are fixed on the side of the second base 31. At the same time, the elastic member 365 is also connected between the slider 364 and the second base 31. The elastic member 365 can be a spring as shown in the accompanying drawings. The elastic force of the contraction of the elastic member 365 is used to pull the slider 364 to move the slider 364 toward the outside of the chain 363, thereby tightening the chain 363 and keeping the chain 363 in a taut state at all times. This can prevent the chain 363 from being derailed due to the chain 363 being too loose after the initial folding roller 32 is adjusted, thereby ensuring the transmission performance of the sprocket 361 of the fixed shaft 34 and the sprocket 361 of the adjusting shaft 33.

[0036] As attached Figure 6 , 7As shown in Figure 10, the fine folding mechanism 2 includes a first base 21, an annular seat 22 and a fine folding block 23. Two fine folding blocks 23 are embedded in the annular seat 22. The end surface of the fine folding block 23 facing the center of the annular seat 22 (i.e., the center of the yield hole 224 described below) is provided with a plurality of protruding folding teeth 231, and the depression formed between two adjacent folding teeth 231 is a folding groove 232. The folding teeth 231 of the two fine folding blocks 23 are interlaced with each other, so that the folding teeth 231 of one fine folding block 23 are embedded in the folding groove 232 of the other fine folding block 23, and there is a gap between the folding teeth 231 and the folding groove 232, and the gap is used to pass the cloth. When the gap between the two fine folding blocks 23 is smaller, it means that the two fine folding blocks 23 are closer to the center of the annular seat 22, that is, the folding teeth 231 of the fine folding blocks 23 are embedded deeper in the surface of the cloth transported by the center of the annular seat 22, which is equivalent to causing deeper folds on the cloth; on the contrary, the larger the gap between the two fine folding blocks 23, the smaller the folds on the cloth. Therefore, by changing the gap between the folding teeth 231 and the folding grooves 232 between the two fine folding blocks 23, the purpose of controlling the final fold depth of the cloth can be achieved.

[0037] As attached Figures 6 to 9 As shown, the annular seat 22 includes two circular flat plates 221, a plurality of screws 223 and a plurality of threaded sleeves 222. A clearance hole 224 for passing the cloth is provided in the center of the flat plate 221, and a plurality of mounting holes 228 are distributed in a circular shape on the surface edge of the flat plate 221. Both ends of the threaded sleeve 222 are provided with threaded holes that are threadedly connected with the screws 223. In addition, two strip-shaped guide holes 225 are provided on the surface of the flat plate 221, and the center lines of the two guide holes 225 are located on the same diameter line of the flat plate 221. Guide blocks 233 are fixed on both sides of the fine folding block 23, and the guide blocks 233 are adapted to be embedded in the guide holes 225. The guide blocks 233 on both sides of the fine folding block 23 are respectively embedded in the corresponding guide holes 225 at both ends of the annular seat 22.

[0038] Continue to refer to the attached Figures 6 to 9When assembling the annular seat 22, the two fine folding blocks 23 are embedded between the two flat plates 221, and the guide blocks 233 on both sides of the fine folding blocks 23 are respectively embedded in the corresponding guide holes 225 of the two flat plates 221, and the folding teeth 231 of the two fine folding blocks 23 are both facing the center of the flat plate 221, and at the same time, the clearance holes 224 in the centers of the two flat plates 221 must correspond to each other; then, each of the threaded sleeves 222 is embedded between the two flat plates 221, and the threaded holes at both ends of the threaded sleeves 222 correspond to the mounting holes of the flat plate 221, and then each of the screws 223 is respectively passed through the mounting holes 228 of the flat plate 221 and is screwed to the threaded holes of the threaded sleeves 222 for fastening. After assembly is completed, the two flat plates 221 are the two end surfaces of the annular seat 22, and the length of the threaded sleeve 222 forms a gap in the middle of the annular sleeve 22 (i.e., between the two flat plates), and the width of the gap is slightly larger than the width of the fine folding block 23, so as to limit the two fine folding blocks 23 and prevent the fine folding blocks 23 from rotating, and make the two fine folding blocks 23 only move along the length direction of the guide hole 225 of the flat plate 221, and move relative to the clearance hole 224.

[0039] As attached Figure 6 and 8 As shown, a part of the annular seat 22 is embedded in the first base 21, and arc-shaped rotation holes 211 are provided on both sides of the first base 21, and positioning screws 25 are passed through the two rotation holes 211. A plurality of positioning holes 226 are also provided on the two flat plates 221 of the annular seat 22, and each positioning hole 226 is distributed at equal intervals along the same arc, and the positioning holes 226 are threaded holes that are threadedly connected with the positioning screws 25. During installation, the positioning screw 25 passes through the rotation hole 211 and is threadedly connected with the positioning hole 226, so that the positioning screw 25 is limited in the rotation hole 211, so that the annular seat 22 can only rotate along the arc of the rotation hole 211 relative to the first base 21, and does not hinder the movement of the fabric at the center of the annular seat 222; and after the positioning screw 25 is screwed and tightened, the handle end of the positioning screw 25 can be tightly attached to the outer side of the first base 21, so that the annular seat 22 is fixed on the first base 21 and cannot rotate, thereby achieving the purpose of fixing after adjustment. By adjusting the annular seat 22 as described above, the conveying angle of the conveyed cloth can be adjusted, which is equivalent to adjusting the conveying height position of the cloth, which is more convenient than the traditional fixed structure.

[0040] In addition, as attached Fig. 9As shown, the fine folding mechanism 2 also includes an adjusting screw 24. A fixing pin 227 is fixed to the outside of the end surfaces of the two fine folding blocks 23 facing away from the folding teeth in the annular seat 22. The fixing pin 227 is provided with a threaded hole adapted to the adjusting screw 24. Specifically, the fixing pin 227 is another type of the above-mentioned threaded sleeve 222, and the difference lies in the threaded hole running through the middle, which is adapted to the thread of the adjusting screw 24. A limiting sleeve 234 is fixed to the end surface of the fine folding block 23 facing away from the folding teeth 231. The end surface of the limiting sleeve 234 is provided with a through hole 235. A limiting ring 241 is fixed to the end of the adjusting screw 24, and the adjusting screw 24 passes through the through hole 235 until the limiting ring 241 is embedded in the limiting sleeve 234. The specific implementation method can be that after the adjusting screw 24 passes through the threaded hole of the fixing pin 227 and the through hole 235 of the limiting sleeve 234, the limiting ring 241 is welded and fixed to the adjusting screw 24, and then the limiting sleeve 234 is welded and fixed to the fine folding block 23. After adopting this structure, the adjusting screw 24 can be rotated to make the adjusting screw 24 move spirally relative to the fixing pin 227, thereby driving the fine folding block 23 to move relative to the clearance hole 224 in the center of the annular seat 22, so as to change the gap between the folding teeth 231 and the folding groove 232 between the two fine folding blocks 23, so as to achieve the purpose of controlling the depth of the folding mark of the cloth.

[0041] In summary, the present invention can adjust the gap formed by the conical protrusions of the two initial folding rollers by adjusting the spacing between the two initial folding rollers, thereby adjusting the crease depth required for processing when the cloth is initially folded. And the present invention can change the gap between the folding teeth and the folding grooves between the two fine folding blocks by moving the distance between the two fine folding blocks relative to the center of the annular seat, thereby adjusting the crease depth required for processing when the cloth is fine folded. Through these two adjustment methods, the purpose of controlling the depth of the crease of the cloth is finally achieved, and the purpose of adjusting the crease depth of the cloth wrinkles required for actual production on the same equipment is achieved.

[0042] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A crease device applied to a mask production line, characterized in that: It includes a primary folding mechanism and a fine folding mechanism which are sequentially arranged along the conveying direction of the mask surface. The initial folding mechanism comprises a second base and an initial folding roller, wherein the second base is provided with two initial folding rollers, wherein one initial folding roller is rotatably connected to the second base, and the other initial folding roller moves relative to a fixed shaft; a plurality of conical protrusions are sequentially provided on the surface of the initial folding roller along its axial direction, and the conical protrusions of the two initial folding rollers are meshed with each other and have a gap; The fine-folding mechanism includes a first base, an annular seat and a fine-folding block. The annular seat can be rotatably fixed on the first base. A clearance hole penetrating through the two end faces is provided in the center of the annular seat. Two fine-folding blocks are also provided in the annular seat, and the two fine-folding blocks move along the same diameter line of the annular seat and move relative to the clearance hole. The end face of the fine-folding block facing the center of the annular seat is provided with a plurality of raised folding teeth, and the depression formed between two adjacent folding teeth is a folding groove. The folding teeth of the two fine-folding blocks are staggered with each other, so that the folding teeth of one fine-folding block are embedded in the folding groove of the other fine-folding block, and the folding teeth and fold marks are both located in the clearance hole of the annular seat.

2. According to claim 1, a crease device applied to a mask production line is characterized in that: The fine folding mechanism also includes an adjusting screw, and fixing pins are fixed on the outside of the end surfaces of the two fine folding blocks facing away from the folding teeth in the annular seat. The fixing pins are provided with threaded holes adapted to the adjusting screws, and the adjusting screws spirally pass through the threaded holes to be rotatably connected to the fine folding blocks.

3. According to claim 2, a crease device applied to a mask production line is characterized in that: A limiting sleeve is fixed on the end face of the fine folding block facing away from the folding teeth, and a through hole is provided on the end face of the limiting sleeve. A limiting ring is fixed on the end of the adjusting screw, and the adjusting screw passes through the through hole until the limiting ring is embedded in the limiting sleeve.

4. According to claim 1, a crease device applied to a mask production line is characterized in that: A portion of the annular seat is embedded in the first base, and an arc-shaped rotating hole is provided on the side of the first base; a plurality of positioning holes are provided on the end face of the annular seat, and the positioning holes are threaded holes, and the positioning holes are spirally connected with positioning screws, and the positioning screws are spirally connected to the positioning holes after passing through the rotating holes.

5. According to claim 1, a crease device applied to a mask production line is characterized in that: Two strip-shaped guide holes are provided on both end faces of the annular seat, and the center lines of the two guide holes on the same end face are located on the same diameter line of the annular seat. Guide blocks are fixed on both sides of the fine folding block, and the guide blocks on both sides of the fine folding block are respectively embedded in the corresponding guide holes at both ends of the annular seat.

6. A crease device for a mask production line according to any one of claims 1 to 5, characterized in that: The annular seat includes two circular plates, a plurality of screws and a plurality of threaded sleeves. A plurality of mounting holes are distributed in a ring shape on the surface of the plates. Both ends of the threaded sleeves are provided with threaded holes threadedly connected to the screws. Each threaded sleeve is embedded between the two plates, and the threaded holes at both ends of the threaded sleeves correspond to the mounting holes of the plates respectively. The screws pass through the mounting holes of the plates and are screwed to the threaded holes of the threaded holes for fastening.

7. According to claim 1, a crease device applied to a mask production line is characterized in that: The initial folding mechanism also includes a fixed shaft and an adjusting shaft, and the centers of the two initial folding rollers are respectively equipped with and fixed with the fixed shaft and the adjusting shaft; the fixed shaft is rotatably fixed below the second base, and the adjusting shaft moves up and down relative to the fixed shaft.

8. A crease device applied to a mask production line according to claim 7, characterized in that: Adjustment holes are provided on both sides of the second base, and the adjustment holes are vertical strip holes, and the adjustment holes are penetrated by adjustment bolts; both ends of the adjustment shaft are fixedly connected to the bearing seat, and the second base has limit plates fixed on both sides of the bearing seat; the adjustment holes correspond to the fixing holes of the bearing seat, and the adjustment bolts pass through the adjustment holes of the second base and the fixing holes of the bearing seat and are threadedly connected with nuts.

9. A crease device for a mask production line according to claim 7, characterized in that: The initial folding mechanism also includes a driving motor, the output shaft of the driving motor is transmission-connected to the fixed shaft, the fixed shaft and the adjusting shaft are both fixed with sprockets on the same side outside the second base, and the sprocket of the fixed shaft and the sprocket of the adjusting shaft are meshed and connected with the same chain.

10. A crease device applied to a mask production line according to claim 9, characterized in that: The initial folding mechanism also includes a slider, a tensioning sprocket and an elastic member. The tensioning sprocket is rotatably connected to the slider and meshes with the chain. The slider is slidably connected to the side of the second base, and the elastic member is connected between the slider and the second base.

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