Thermoplastic continuous fiber non-driven unwinding device

Abstract

The application discloses a thermoplastic continuous fiber non-driving unwinding device, which comprises a bottom plate, mounting plates arranged on the two sides of the top of the bottom plate, second bidirectional threaded rods rotationally arranged at the bottom of the inside of the two groups of mounting plates, connecting rods threadedly connected to the two sides of the outside of the second bidirectional threaded rods, connecting sleeves arranged at the top of the two groups of connecting rods, and supporting mechanisms arranged at the middle positions of the inside of the two groups of mounting plates. The yarn on the unwinding fiber yarn cylinder is in close contact with the hinged shaft, so that the force in contact with the yarn is always kept constant, the tension of the yarn during unwinding is always kept constant, wrinkles on the surface of the material can be effectively prevented, the material always moves on the same movement track through the limiting of the two groups of rollers, deviation of the material during long-time unwinding is prevented, the quality of unwinding is improved, and the influence on subsequent processing of the material is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of unwinding devices, in particular to a non-driven unwinding device for thermoplastic continuous fibers. Background Art

[0002] Continuous fiber-reinforced thermoplastic composites utilize unique processes to produce products with superior properties, including high strength, high modulus, high impact resistance, fatigue resistance, good thermal stability, corrosion resistance, low warpage, and environmentally friendly recyclability. Continuous fiber-reinforced thermoplastic composites are often prepared using high-temperature impregnation methods. During the production of continuous fiber-reinforced thermoplastic composites, an unwinding device is required.

[0003] The current unwinding device has certain shortcomings:

[0004] 1. In the existing production process of continuous fiber reinforced thermoplastic composite materials, as the diameter of the carbon fiber bobbin changes, if the fiber unwinding speed and tension are inconsistent during the unwinding process, the fiber yarn is often uneven after entering the impregnation mold. In addition, the melt viscosity of the thermoplastic resin is very high, the wettability is poor, and it is not easy to penetrate the fiber yarn, which directly leads to unstable fiber content in the composite sheet.

[0005] 2. At the same time, when installing the bobbins, it is necessary to deal with bobbins of different diameters and lengths. Because there are many different specifications in the production of continuous fibers, the diameters of the bobbins required will also be different, so the unwinding device is relatively limited;

[0006] 3. At the same time, when unwinding, the fiber bobbin may be completely unwound, so the operator needs to replace it in time to prevent delaying production efficiency. However, there is a lack of a mechanism to remind the operator in time, so the operator cannot find it quickly. Summary of the Invention

[0007] The object of the present invention is to provide a non-driven unwinding device for thermoplastic continuous fibers to solve the related problems raised in the above background technology.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solution: a non-driven unwinding device for thermoplastic continuous fiber, comprising a base plate, mounting plates are provided on both sides of the top of the base plate, a second bidirectional threaded rod is rotatably provided at the bottom of the two groups of mounting plates, and connecting rods are threadedly connected on both sides of the outer sides of the second bidirectional threaded rods, a connecting sleeve is provided on the top of the two groups of connecting rods, a supporting mechanism is provided at the middle position of the two groups of mounting plates, a through groove is provided at the top of the two groups of mounting plates, a return spring is provided at the bottom of the two groups of through grooves, a supporting slide rod is slidably provided inside the two groups of through grooves, a contact roller is provided on the side where the two groups of supporting slide rods are close to each other, an extrusion rod is provided on the side where the two groups of supporting slide rods are away from each other, a switch is provided on the top of the side where the two groups of mounting plates are away from each other, a spring telescopic rod is provided on the top of the front end of the two groups of mounting plates, a rack is provided on the back end of the two groups of spring telescopic rods, and a tensioning mechanism is provided on the front end of the top of the side where the two groups of mounting plates are close to each other.

[0009] Preferably, the support mechanism includes a support shaft, a first annular rack, a turntable, a support plate, a slide groove, a driving rod, a fixed block, a telescopic rod and an arc groove, the support shaft is provided with two groups located in the middle position inside the mounting plate, a clamping mechanism is provided on the side close to each other in the two groups of support shafts, a fixed block is provided on the side close to each other in the two groups of support shafts, and a fixed block is provided on the side close to each other in the two groups of support shafts, and a slide groove is evenly provided on the outer side of the fixed block, and a telescopic rod is slidably provided on the inner side of the slide groove, and a support plate is provided at the position where the telescopic rod is away from the center of the circle, and a driving rod is provided at the bottom of the telescopic rod close to the support shaft side, a turntable is sleeved on the side of the outer side of the support shaft close to the fixed block, four groups of arc grooves are provided on the side of the turntable close to the fixed block, and a first annular rack is provided on the side of the turntable away from the fixed block.

[0010] Preferably, the tensioning mechanism includes an articulated shaft, an articulated rod, a first bidirectional threaded rod, a through hole, a roller, an annular groove, a moving rod, a mounting cylinder, a gear and an extrusion wheel, the articulated shaft is provided with two groups, respectively located at the front end of the top of one side of the mounting plate close to each other, a gear is provided on the side where the two groups of articulated shafts are close to each other, an articulated rod is sleeved on the outer sides of the two groups of articulated shafts, the bottoms of the two groups of articulated rods are hinged with a mounting cylinder, an extrusion wheel is provided at the middle position of the outer side of the mounting cylinder, annular grooves are provided on both sides of the outer side of the extrusion wheel, through holes are provided on both sides of the bottom of the mounting cylinder, first bidirectional threaded rods are provided on both sides of the inside of the mounting cylinder, moving rods are provided on both sides of the outer side of the first bidirectional threaded rod, and rollers are provided on the side where the two groups of moving rods are close to each other.

[0011] Preferably, the locking mechanism includes a spring groove, an extrusion spring, a second annular rack and a fixed slide rod, the spring groove is located on one side inside the support shaft, an extrusion spring is provided on one side inside the spring groove, a fixed slide rod is provided on one side of the extrusion spring, and a second annular rack is provided on the top and bottom of the fixed slide rod.

[0012] Preferably, the fixed slide rod slides inside the spring slot, and the top and bottom of the fixed slide rod both extend out of the spring slot.

[0013] Preferably, the second annular rack is arranged opposite to the tooth surface of the first annular rack, and the second annular rack and the first annular rack are meshed with each other.

[0014] Preferably, one side of the driving rod extends out of the interior of the sliding groove and extends into the interior of the arc-shaped groove, and the arc-shaped groove and the driving rod slide with each other.

[0015] Preferably, one side of the support shaft passes through the interior of the connecting sleeve, and the support shaft and the connecting sleeve are connected to each other via a bearing.

[0016] Preferably, the spring telescopic rod consists of a spring sleeve, a telescopic rod and a spring, and the spring is located at the top inside the spring sleeve, and the telescopic rod is located at the bottom of the spring, and the rack is located at one end of the telescopic rod.

[0017] Preferably, the rack is located directly in front of the gear, and the rack and the gear are meshed with each other.

[0018] Compared with the prior art, the present invention provides a non-driven unwinding device for thermoplastic continuous fibers, which has the following beneficial effects:

[0019] 1. The present invention makes close contact with the yarn on the unwound fiber yarn drum through the hinged shaft, so that the contact force with the yarn is always kept constant, so that the tension of the yarn is always constant when the yarn is unwound, and at the same time, wrinkles can be effectively prevented from occurring on the surface of the material. The two sets of rollers limit the material so that the material always moves on the same motion trajectory, preventing the material from deflecting during long-term unwinding, improving the unwinding quality, and reducing the impact on subsequent processing of the material.

[0020] 2. The present invention utilizes four groups of support plates to move outward at the same time, which can stably support and fix the inside of the fiber yarn tube. The rotating turntable drives the driving rod to move through the arc groove, so that the support plates can be extended and extended to support different diameters. After the support is completed, the turntable can be fixed by the mutual engagement between the first annular rack and the second annular rack, thereby preventing the four groups of support plates from loosening the fiber yarn tube.

[0021] 3. In the present invention, the contact roller is pulled by two sets of return springs, so that the contact roller is always in close contact with the surface of the fiber yarn tube. As the diameter of the fiber yarn tube decreases, the contact roller can move downward, so that the two sets of squeezing rods are driven by the contact rollers and gradually approach the switch, so that the squeezing rods squeeze the switch, turn on the external alarm mechanism, and promptly remind the operator to replace the fiber yarn tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front cross-sectional view of the present invention;

[0023] Figure 2 is a side sectional view of the present invention;

[0024] Figure 3 This is a front view of the support mechanism of the present invention;

[0025] Figure 4 It is a front sectional view of the support mechanism of the present invention;

[0026] Figure 5 It is a side view of the turntable of the present invention;

[0027] Figure 6 This is a front sectional view of the tensioning mechanism of the present invention.

[0028] In the figure: 1. Base plate; 2. Support mechanism; 201. Support shaft; 202. First annular rack; 203. Turntable; 204. Support plate; 205. Slide; 206. Drive rod; 207. Fixed block; 208. Telescopic rod; 209. Arc groove; 3. Tensioning mechanism; 301. Articulated shaft; 302. Articulated rod; 303. First bidirectional threaded rod; 304. Through hole; 305. Roller; 306. Annular groove; 307. Moving Rod; 308, mounting cylinder; 309, gear; 310, extrusion wheel; 4, locking mechanism; 401, spring groove; 402, extrusion spring; 403, second annular rack; 404, fixed slide; 5, second bidirectional threaded rod; 6, connecting sleeve; 7, through groove; 8, extrusion rod; 9, mounting plate; 10, contact roller; 11, support slide; 12, reset spring; 13, switch; 14, connecting rod; 15, spring telescopic rod; 16, rack. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] See also Figure 1-6The present invention provides a technical solution: a non-driven unwinding device for thermoplastic continuous fibers, comprising a bottom plate 1, mounting plates 9 are provided on both sides of the top of the bottom plate 1, a second bidirectional threaded rod 5 is rotatably provided at the bottom inside the two sets of mounting plates 9, a connecting rod 14 is threadedly connected to both sides of the outer side of the second bidirectional threaded rod 5, a connecting sleeve 6 is provided on the top of the two sets of connecting rods 14, a supporting mechanism 2 is provided at the middle position inside the two sets of mounting plates 9, a through slot 7 is provided on the top of the two sets of mounting plates 9, and a through slot 7 is provided at the bottom inside the two sets of through slots 7. There is a return spring 12, and a support slide bar 11 is provided for sliding inside the two groups of through grooves 7. A contact roller 10 is provided on the side where the two groups of support slide bars 11 are close to each other, and an extrusion rod 8 is provided on the side where the two groups of support slide bars 11 are away from each other. A switch 13 is provided on the top of the side where the two groups of mounting plates 9 are away from each other, a spring telescopic rod 15 is provided on the top of the front end of the two groups of mounting plates 9, and a rack 16 is provided on the back end of the two groups of spring telescopic rods 15. A tensioning mechanism 3 is provided on the front end of the top of the side where the two groups of mounting plates 9 are close to each other.

[0031] As a preferred solution of this embodiment: the support mechanism 2 includes a support shaft 201, a first annular rack 202, a turntable 203, a support plate 204, a slide groove 205, a driving rod 206, a fixing block 207, a telescopic rod 208 and an arc groove 209. The support shaft 201 is provided with two groups located in the middle position inside the mounting plate 9. The two groups of support shafts 201 are provided with a locking mechanism 4 on the side close to each other. The two groups of support shafts 201 are provided with a fixing block 207 on the side close to each other. The two groups of support shafts 201 are provided with a fixing block 207 on the side close to each other. Slide grooves 205 are evenly provided on the outside of the fixed block 207, and a telescopic rod 208 is slidably provided on the inside of the slide groove 205. A support plate 204 is provided at the telescopic rod 208 away from the center of the circle, and a driving rod 206 is provided at the bottom of the telescopic rod 208 close to the support shaft 201. A turntable 203 is sleeved on the side of the outer side of the support shaft 201 close to the fixed block 207. Four groups of arc grooves 209 are provided on the side of the turntable 203 close to the fixed block 207. A first annular rack 202 is provided on the side of the turntable 203 away from the fixed block 207 to fix the fiber yarn bobbin.

[0032] As a preferred solution of this embodiment: the tensioning mechanism 3 includes an articulated shaft 301, an articulated rod 302, a first bidirectional threaded rod 303, a through hole 304, a roller 305, an annular groove 306, a moving rod 307, a mounting cylinder 308, a gear 309 and an extrusion wheel 310. The articulated shaft 301 is provided with two groups of front ends of the top of the mounting plate 9 close to each other, and the two groups of articulated shafts 301 are provided with gears 309 on the side close to each other. The outer sides of the two groups of articulated shafts 301 are sleeved with articulated rods 302. The two groups The bottom of the hinged rod 302 is hinged with a mounting cylinder 308, and an extrusion wheel 310 is provided at the middle position of the outer side of the mounting cylinder 308. Annular grooves 306 are provided on both sides of the outer side of the extrusion wheel 310, and through holes 304 are provided on both sides of the bottom of the mounting cylinder 308. First bidirectional threaded rods 303 are provided on both sides of the inside of the mounting cylinder 308, and moving rods 307 are provided on both sides of the outer side of the first bidirectional threaded rod 303. Rollers 305 are provided on the side where the two groups of moving rods 307 are close to each other, so as to keep the tension of the yarn consistent.

[0033] As a preferred solution of this embodiment: the locking mechanism 4 includes a spring groove 401, an extrusion spring 402, a second annular rack 403 and a fixed slide bar 404, the spring groove 401 is located on one side inside the support shaft 201, an extrusion spring 402 is provided on one side inside the spring groove 401, a fixed slide bar 404 is provided on one side of the extrusion spring 402, and a second annular rack 403 is provided on the top and bottom of the fixed slide bar 404 to fix the first annular rack 202.

[0034] As a preferred solution of this embodiment: the fixed slide bar 404 slides inside the spring slot 401, and the top and bottom of the fixed slide bar 404 both extend out of the spring slot 401 to facilitate the sliding of the second annular rack 403.

[0035] As a preferred solution of this embodiment: the second annular rack 403 is arranged opposite to the tooth surface of the first annular rack 202 , and the second annular rack 403 and the first annular rack 202 are meshed with each other to engage the first annular rack 202 .

[0036] As a preferred solution of this embodiment: one side of the driving rod 206 extends out of the interior of the sliding groove 205 and extends to the interior of the arc groove 209, and the arc groove 209 and the driving rod 206 slide with each other, so that the arc groove 209 can push the driving rod 206 to move.

[0037] As a preferred solution of this embodiment: one side of the support shaft 201 passes through the interior of the connecting sleeve 6, and the support shaft 201 and the connecting sleeve 6 are connected to each other through a bearing, so as to facilitate the movement of the support shaft 201.

[0038] As a preferred solution of this embodiment: the spring telescopic rod 15 consists of a spring sleeve, a telescopic rod and a spring, and the spring is located at the top inside the spring sleeve, and the telescopic rod is located at the bottom of the spring, and the rack 16 is located at one end of the telescopic rod, so that the rack 16 always has a downward force.

[0039] As a preferred solution of this embodiment: the rack 16 is located right in front of the gear 309, and the rack 16 and the gear 309 are meshed with each other, so that the gear 309 is always in a state of having a rotational force.

[0040] Example 1, as Figure 4-5 As shown, the fiber yarn drum is placed between the two groups of support mechanisms 2, and the two groups of connecting rods 14 are driven to approach each other by rotating the second bidirectional threaded rod 5, and the support shaft 201 is driven to slide inside the mounting plate 9 and approach each other through the connecting sleeve 6. When the two groups of fixing blocks 207 are completely inserted into the fiber yarn drum, the second annular rack 403 is moved away from the first annular rack 202, so that the first annular rack 202 and the second annular rack 403 are separated from each other. At this time, the four groups of arc grooves 209 are driven to rotate by rotating the turntable 203, and the arc edges of the four groups of arc grooves 209 push the driving rod 206 to slide linearly inside the slide groove 205, and the support plate 204 is driven to expand in all directions by the telescopic rod 208, supporting the inner wall of the fiber yarn drum to complete the fixation of the fiber yarn drum, and under the elastic force of the extrusion spring 402, the second annular rack 403 is driven to engage with the first annular rack 202 through the fixed slide rod 404 to fix the first annular rack 202.

[0041] Example 2, as Figure 4-5 As shown, when the yarn is released, the surface of the extrusion wheel 310 is always in contact with the extrusion wheel 310. As the diameter of the fiber yarn tube gradually decreases, the path of the fiber yarn propagation will also decrease and change. Since the gear 309 and the rack 16 are engaged with each other, the rack 16 will move downward to drive the gear 309 to rotate, and the gear 309 drives the hinged rod 302 to rotate downward, so that the extrusion wheel 310 moves downward and contacts and squeezes the limiting yarn, so that the limiting yarns are tight and maintain a certain tension. By rotating the first bidirectional threaded rod 303, the two groups of moving rods 307 are driven to approach each other, and the two groups of moving rods 307 drive the roller 305 to slide inside the annular groove 306 to limit the yarn to prevent deviation during unwinding, which affects subsequent work, so that the unwound yarns are always within a certain range.

[0042] Working principle: Place the fiber yarn bobbin between the two groups of support mechanisms 2, and drive the two groups of connecting rods 14 to approach each other by rotating the second bidirectional threaded rod 5, and drive the support shaft 201 to slide inside the mounting plate 9 and approach each other through the connecting sleeve 6. When the two groups of fixing blocks 207 completely enter the interior of the fiber yarn bobbin, the four groups of arc grooves 209 are driven to rotate by rotating the turntable 203, and the four groups of arc grooves 209 drive the driving rod 206 to slide inside the slide groove 205, and the support plate 204 is driven to expand to the surroundings by the telescopic rod 208 to support the inner wall of the fiber yarn bobbin, thereby completing the fixation of the fiber yarn bobbin.

[0043] When the yarn is released, the surface of the extrusion wheel 310 is always in contact with the extrusion wheel 310. As the diameter of the fiber yarn tube gradually decreases, the path of the fiber yarn propagation will also decrease and change. Since the gear 309 and the rack 16 are engaged with each other, the rack 16 will move downward to drive the gear 309 to rotate, and the gear 309 drives the hinged rod 302 to rotate downward, so that the extrusion wheel 310 moves downward and contacts and squeezes the limiting yarn, making the limiting yarns tight and maintaining a certain tension.

[0044] At the same time, the contact roller 10 is pulled by the two sets of return springs 12 to contact the surface of the fiber yarn bobbin, so that the contact roller 10 can move downward as the diameter of the fiber yarn bobbin decreases. As a result, the two sets of squeezing rods 8 are driven by the contact rollers 10 and gradually approach the switch 13, so that the squeezing rods 8 squeeze the switch 13, turn on the external alarm mechanism, and promptly remind the operator to replace the fiber yarn bobbin.

[0045] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A thermoplastic continuous fiber non-driven unwinding device, comprising a bottom plate (1), characterized in that: Mounting plates (9) are provided on both sides of the top of the bottom plate (1), and second bidirectional threaded rods (5) are rotatably provided at the bottom of the two groups of mounting plates (9), and connecting rods (14) are threadedly connected on both sides of the outer sides of the second bidirectional threaded rods (5). Connecting sleeves (6) are provided on the tops of the two groups of connecting rods (14), and supporting mechanisms (2) are provided at the middle positions of the two groups of mounting plates (9). Through slots (7) are provided on the tops of the two groups of mounting plates (9), and reset springs (12) are provided at the bottoms of the two groups of through slots (7). The internal slide is provided with a support slide bar (11), a contact roller (10) is provided on the side where the two groups of support slide bars (11) are close to each other, an extrusion rod (8) is provided on the side where the two groups of support slide bars (11) are away from each other, a switch (13) is provided on the top of the side where the two groups of mounting plates (9) are away from each other, a spring telescopic rod (15) is provided on the top of the front end of the two groups of mounting plates (9), a rack (16) is provided on the back end of the two groups of spring telescopic rods (15), and a tensioning mechanism (3) is provided on the front end of the top of the side where the two groups of mounting plates (9) are close to each other. The tensioning mechanism (3) comprises a hinge shaft (301), a hinge rod (302), a first bidirectional threaded rod (303), a through hole (304), a roller (305), an annular groove (306), a moving rod (307), a mounting cylinder (308), a gear (309) and an extrusion wheel (310). The hinge shaft (301) is provided with two groups of front ends respectively located at the top of one side close to each other on the mounting plate (9). The gears (309) are provided on the side close to each other of the two groups of hinge shafts (301). The hinge rods (302) are sleeved on the outer sides of the two groups of hinge shafts (301). The bottoms of the two groups of hinged rods (302) are hingedly connected with mounting cylinders (308), an extrusion wheel (310) is provided at the middle position of the outer side of the extrusion wheel (310), annular grooves (306) are provided on both sides of the outer side of the extrusion wheel (310), through holes (304) are provided on both sides of the bottom of the mounting cylinder (308), first bidirectional threaded rods (303) are provided on both sides of the interior of the mounting cylinder (308), moving rods (307) are provided on both sides of the outer side of the first bidirectional threaded rod (303), and rollers (305) are provided on the sides of the two groups of moving rods (307) that are close to each other.

2. The non-driven unwinding device for thermoplastic continuous fibers according to claim 1, characterized in that: The support mechanism (2) comprises a support shaft (201), a first annular rack (202), a turntable (203), a support plate (204), a slide groove (205), a driving rod (206), a fixing block (207), a telescopic rod (208) and an arc groove (209), wherein the support shaft (201) is provided with two groups located at the middle position inside the mounting plate (9), a locking mechanism (4) is provided on the side close to each other inside the two groups of support shafts (201), a fixing block (207) is provided on the side close to each other inside the two groups of support shafts (201), and the fixing block (207) is provided on the side close to each other inside the two groups of support shafts (201). The outer side of the fixed block (207) is evenly provided with a sliding groove (205), the inner side of the sliding groove (205) is slidably provided with a telescopic rod (208), the telescopic rod (208) is provided with a support plate (204) away from the center of the circle, the bottom of the telescopic rod (208) close to the support shaft (201) is provided with a driving rod (206), the outer side of the support shaft (201) is provided with a turntable (203) on the side close to the fixed block (207), the turntable (203) is provided with four groups of arc grooves (209) on the side close to the fixed block (207), and the turntable (203) is provided with a first annular rack (202) on the side away from the fixed block (207).

3. The non-driven unwinding device for thermoplastic continuous fibers according to claim 2, characterized in that: The engaging mechanism (4) comprises a spring slot (401), an extrusion spring (402), a second annular rack (403) and a fixed slide bar (404); the spring slot (401) is located on one side of the support shaft (201); an extrusion spring (402) is provided on one side of the spring slot (401); a fixed slide bar (404) is provided on one side of the extrusion spring (402); and the second annular rack (403) is provided on the top and bottom of the fixed slide bar (404).

4. The non-driven unwinding device for thermoplastic continuous fibers according to claim 3, characterized in that: The fixed slide bar (404) slides inside the spring slot (401), and the top and bottom of the fixed slide bar (404) both extend out of the spring slot (401).

5. The non-driven unwinding device for thermoplastic continuous fibers according to claim 3, characterized in that: The second annular rack (403) and the tooth surface of the first annular rack (202) are arranged opposite to each other, and the second annular rack (403) and the first annular rack (202) are meshed with each other.

6. The non-driven unwinding device for thermoplastic continuous fibers according to claim 2, characterized in that: One side of the driving rod (206) extends out of the interior of the sliding groove (205) and extends to the interior of the arc groove (209), and the arc groove (209) and the driving rod (206) slide with each other.

7. The non-driven unwinding device for thermoplastic continuous fibers according to claim 2, characterized in that: One side of the support shaft (201) passes through the interior of the connecting sleeve (6), and the support shaft (201) and the connecting sleeve (6) are connected to each other via a bearing.

8. The non-driven unwinding device for thermoplastic continuous fibers according to claim 1, characterized in that: The spring telescopic rod (15) is composed of a spring sleeve, a telescopic rod and a spring, wherein the spring is located at the top inside the spring sleeve, and the telescopic rod is located at the bottom of the spring, and the rack (16) is located at one end of the telescopic rod.

9. The non-driven unwinding device for thermoplastic continuous fibers according to claim 1, characterized in that: The rack (16) is located directly in front of the gear (309), and the rack (16) and the gear (309) are meshed with each other.

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