Cloth spreading device

Abstract

The utility model relates to the technical field of knitted fabric manufacturing equipment, and mainly discloses a cloth expanding device which comprises a support, an expanding mechanism and an overfeeding mechanism, overfeeding wheels are arranged on the overfeeding mechanism, the expanding mechanism is arranged between the two overfeeding wheels, a steam box is arranged above the expanding mechanism, a plurality of idler wheels are arranged on the expanding mechanism, and the steam box and the idler wheels are arranged on the support. The overfeeding wheel is in rotating contact with two rollers on the spreading support, a swing cloth guide frame and a fixed guide roller are arranged at the top of the support, a first cloth feeding roller is arranged at the bottom of the spreading mechanism, a second cloth feeding roller is arranged above the steam box, a cloth discharging roller is arranged behind the second cloth feeding roller, and the rotating speed of the second cloth feeding roller is larger than that of the cloth discharging roller. By planning and designing the driving and driven design and layout of the cloth feeding roller, the stretching degree of the fabric is more uniform, a product produced by the wool blanket preshrinking finishing machine meets the preset shrinkage rate requirement, in addition, the overfeeding expanding size can be transversely adjusted, and the machine is suitable for cylindrical knitted fabrics of various sizes.

Description

Technical Field

[0001] The utility model relates to the technical field of knitting fabric manufacturing equipment, in particular to a fabric overfeed and width expanding device for a woolen blanket pre-shrinking and finishing machine. Background Art

[0002] The finishing of woolen blankets is a method of finishing knitted fabrics on a woolen blanket compression pre-shrinking machine. During finishing, when a woolen blanket with a certain thickness bypasses a guide cloth roller with a smaller diameter, the outer layer expands, and the fabric clings to the surface-expanded woolen blanket. When the woolen blanket leaves the guide cloth roller or the curvature reverses, shrinkage is bound to occur, and at this time, the fabric will also shrink synchronously. At the same time, due to the high temperature of the drying cylinder, the fabric is ironed and shaped, the fabric length is shortened, and the straight shrinkage rate is reduced.

[0003] According to different cloth feeding methods, woolen blanket pre-shrinking and finishing machines can be divided into cylindrical knitted fabric woolen blanket pre-shrinking machines and flat knitted fabric woolen blanket pre-shrinking machines. Their pre-shrinking mechanisms are the same, but the production processes are slightly different.

[0004] A cylindrical knitted fabric woolen blanket pre-shrinking machine generally consists of a cloth feeding device, an overfeed and width expanding device, a steam box, a woolen blanket pre-shrinking mechanism (including damping sheets, electric heating drying cylinders, woolen blankets, inlet and outlet cloth rollers, woolen blanket tension deviation correcting rollers, fabric tension control devices), a cloth discharging device, a cloth stacking device, etc. Its technological process is: cylindrical knitted fabric - loose cloth feeding - overfeeding and width expanding - steam heating - double-sided pre-shrinking and shaping - cloth discharging - automatic cloth stacking or winding.

[0005] Since cotton knitted fabrics are formed by the interlocking of coils, after a series of wet treatments such as scouring, bleaching, dyeing, and washing, due to the action of warp tension, the coils are straightened along the warp direction, the size deforms and elongates, while the weft coils shrink, and the size deforms and shortens. After loose drying treatment, part of the deformation can be restored, and part of the internal stress still remains in the fabric. After the finished garment is worn and washed, the internal stress is gradually released, the coils return to the state before washing, and the finished garment is severely deformed and cannot be worn continuously. Overfeeding is a means that needs to be adopted during the dyeing and finishing of textiles. During the dyeing and finishing process of textiles, the warp direction is subjected to a large tensile force, resulting in the elongation of the piece length and the narrowing of the width. In order to overcome this unstable state and ensure the dimensional stability of textiles, the cloth feeding speed is adjusted during stenter setting or shaping, so an overfeed and width expanding device is arranged in front of the cylindrical knitted fabric woolen blanket pre-shrinking machine.

[0006] The existing overfeed and width expanding devices have various problems, resulting in uneven stretching amplitude of the fabric, thus causing the shrinkage rate of the final fabric product not to meet the preset standard. Content of the Utility Model

[0007] The object of the present utility model is to solve the technical problems existing in the prior art, and provides a fabric width expanding device. By planning and designing the active and driven design and layout of the feeding roller, the stretching degree of the fabric is made more uniform, the quality of the finally produced product is higher, the product produced by the blanket pre-shrinking finishing machine meets the preset shrinkage rate requirements, and in addition, the size of the overfeed width expansion can be adjusted horizontally, which is applicable to cylindrical knitted fabrics of various sizes.

[0008] To achieve the above object, the present utility model adopts the following technical solutions: A fabric width expanding device, comprising a bracket, a width expanding mechanism and an overfeed mechanism. An overfeed wheel is provided on the overfeed mechanism. The overfeed mechanisms are symmetrically arranged along the midline of the bracket on the bracket in a mirror image manner. The width distance between the two overfeed mechanisms can be adjusted. An overfeed mechanism is provided between the two overfeed wheels. A steam box is arranged above the width expanding mechanism. The steam box is communicated with a steam inlet and outlet pipe. The width expanding mechanism comprises two width expanding brackets symmetrically arranged along the midline of the bracket. A plurality of rollers are provided on the width expanding brackets. The bottom of the width expanding bracket is bent towards the midline of the bracket. The overfeed wheel is in rotational contact with two rollers on the width expanding bracket. A swing fabric guide frame and a fixed guide roller are sequentially arranged from front to back at the top of the side of the bracket. A first feeding roller is arranged on the bracket at the bottom of the width expanding mechanism. A second feeding roller is arranged on the bracket above the steam box. A fabric outlet roller is arranged on the bracket behind the second feeding roller. The rotational speed of the second feeding roller is greater than that of the fabric outlet roller. The swing fabric guide frame and the fixed guide roller are driven in a driven manner when guiding the movement of the cylindrical knitted fabric. The first feeding roller, the second feeding roller and the fabric outlet roller are driven in an active manner when guiding the movement of the cylindrical knitted fabric.

[0009] Through the above technical solutions, the device is installed at the front end of the blanket type pre-shrinking finishing machine. The pretreated cylindrical knitted fabric is folded and placed, and sequentially passes through the upper swing guide frame and the fixed guide roller, and then passes through the first feeding roller at the bottom and then the cylindrical knitted fabric is sleeved on the width expanding mechanism. The linear speed of the overfeed wheel is greater than the speed of the subsequent fabric outlet roller. Therefore, the overfeed wheel feeds the cylindrical knitted fabric into the steam box in a slack state according to the required overfeed amount. The steam box sprays hot steam on both sides of the cylindrical knitted fabric at the same time, so that the internal stress is gradually released, and the coil returns to the state before water washing to obtain a preliminary shaping, and finally enters the pre-shrinking finishing process for subsequent overfeeding to obtain the final shaping.

[0010] A further solution of the present utility model lies in that a telescopic rod is arranged between the two width expanding brackets. The telescopic rod comprises a large rod and a small rod. The small rod is embedded inside the large rod. A locking screw is arranged on the large rod of the telescopic rod. By adjusting the telescopic amount of the large rod and the small rod, the roller of the width expanding bracket is brought into contact with the overfeed wheel.

[0011] A further solution of the present utility model is that the overfeed mechanism further includes a transmission shaft disposed on the bracket. The two ends of the transmission shaft are respectively rotatably connected to the two ends of the bracket. Bearings and bearing seats are provided at the connection between the transmission shaft and the bracket. Large bevel gears are symmetrically arranged along the midline of the bracket on the transmission shaft. The large bevel gears are connected to the transmission shaft by keys, and sliding key grooves are provided on the transmission shaft. The large bevel gears are meshed and connected with small bevel gears. The small bevel gears are connected to the overfeed shaft, and the overfeed wheels are arranged at the ends of the overfeed shaft. The large bevel gears, small bevel gears and overfeed shaft are arranged inside the gearbox. The gearbox only has the freedom to slide along the length direction of the transmission shaft. The transmission shaft is driven by an overfeed motor. The overfeed motor drives the transmission shaft to rotate. The transmission shaft drives the large bevel gears to rotate. The large bevel gears drive the small bevel gears to rotate, and finally drive the overfeed wheels to rotate through the overfeed shaft.

[0012] A further solution of the present utility model is that the overfeed mechanism further includes a lead screw disposed on the bracket. The two ends of the lead screw are respectively rotatably connected to the two ends of the bracket. Bearings and bearing seats are provided at the connection between the lead screw and the bracket. Threads are symmetrically arranged along the midline of the bracket on the lead screw. The directions of the threads on both sides of the midline of the bracket are opposite. Sliders are fitted on the threads. The sliders are fixedly connected to the gearbox. The lead screw is driven by a lateral adjustment motor. The lateral adjustment motor is a stepping motor. The lateral adjustment motor drives the lead screw to rotate. The lead screw drives the two sliders to move relatively or towards each other simultaneously, thereby driving the gearbox and the overfeed wheels to move.

[0013] A further solution of the present utility model is that the overfeed mechanism further includes a fixed rod disposed on the bracket. The two ends of the fixed rod are respectively fixedly connected to the two ends of the bracket. Sliding rings are symmetrically arranged along the midline of the bracket on the fixed rod. The sliding rings are slidably connected to the fixed rod. The sliding rings are fixedly connected to the gearbox.

[0014] A further solution of the present utility model is that the transmission shaft, the lead screw and the fixed rod are located on the same vertical line, and the lead screw is arranged in the middle of the transmission shaft and the fixed rod. The fixed rod is arranged relatively above the bracket, and the transmission shaft is arranged relatively below the bracket.

[0015] A further solution of the present utility model is that the gearbox, the sliders and the sliding rings are integrally designed.

[0016] Through the above technical solution, the transmission shaft, the lead screw and the fixed rod are located on the same vertical line, which can reduce the rotation of the amplitude expanding mechanism caused by the centrifugal force generated by the rotation of the overfeed wheels, making the overfeed mechanism and the amplitude expanding mechanism relatively stable, and thus producing better effects.

[0017] A further solution of the present utility model is that the first fabric feeding roller is driven by a fabric feeding motor, the second fabric feeding roller and the fabric discharging roller are both driven by a fabric discharging motor. The motor shaft of the fabric feeding motor is connected to the shaft of the first fabric feeding roller through a coupling. One end of the shaft of the fabric discharging roller is connected to the motor shaft of the fabric discharging motor through a coupling, and a large pulley is arranged at the other end of the shaft of the fabric discharging roller. A small pulley that cooperates with the large pulley is arranged on the second fabric feeding roller, and the large pulley and the small pulley are connected by a belt.

[0018] A further solution of the present utility model is that the swing guide frame includes a first guide roller and a second guide roller. One ends of the first guide roller and the second guide roller are fixedly connected, and the other ends of the first guide roller and the second guide roller are also fixedly connected. Fixed rings are arranged at intervals in the middle of the first guide roller. The two ends of the connected first guide roller and second guide roller are respectively rotatably connected to the upper end of the top of the bracket, and the two ends of the fixed guide roller are respectively rotatably connected to the upper end of the top of the bracket.

[0019] A further solution of the present utility model is that the diameter ratio of the large pulley to the small pulley is 1.2 - 1.5:1, and the second fabric feeding roller performs an appropriate amount of overfeeding towards the fabric discharging roller, so as to avoid uneven fabric tension caused by stretching during fabric discharging of the fabric discharging roller, which in turn affects the shrinkage rate not meeting the expectation.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] The present utility model provides a fabric width expanding device. By planning and designing the active and driven design and layout of the fabric feeding rollers, the stretching degree of the fabric is made more uniform, the quality of the finally produced product is higher, the product produced by the blanket pre-shrinking finishing machine meets the preset shrinkage rate requirements, and in addition, the size of the overfeeding width expansion can be adjusted horizontally, which is applicable to various sizes of circular knitted fabrics. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is the front view of the fabric width expanding device of the present utility model;

[0024] Figure 2 It is the top view of the fabric width expanding device of the present utility model;

[0025] Figure 3 For the present utility modelFigure 1 Cross-sectional view along the A-A direction and reference view of the usage state

[0026] Figure 4 For the present utility model Figure 4 Structural enlarged schematic diagram of the overfeed mechanism and the fabric width expanding mechanism

[0027] Figure 5 For the present utility model Figure 1 Cross-sectional view along the B-B direction

[0028] Figure 6 For the present utility model Figure 5 Structural enlarged schematic diagram of the overfeed mechanism

[0029] Figure 7 Stereogram of the fabric width expanding device of the present utility model

[0030] In the figure: 1, support; 2, fabric width expanding mechanism; 3, overfeed mechanism; 4, steam box; 5, first fabric feeding roller; 6, second fabric feeding roller; 7, fabric discharging roller; 8, swinging fabric guiding frame; 9, fixed guiding roller; 10, circular knitted fabric; 11, fabric feeding motor; 12, lateral adjustment motor; 13, overfeed motor; 14, fabric discharging motor; 15, large belt pulley; 16, small belt pulley; 21, fabric width expanding support; 22, roller; 23, small rod; 24, large rod; 30, gear box; 31, fixed rod; 32, sliding suspension ring; 33, lead screw; 34, slider; 35, overfeed shaft; 36, large bevel gear; 37, small bevel gear; 38, overfeed shaft; 39, overfeed wheel; 91, first guiding roller; 92, second guiding roller; 93, fixed ring Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model

[0032] As Figures 1-7 shown, a fabric width expanding device includes a support 1, a fabric width expanding mechanism 2 and an overfeed mechanism 3

[0033] Specifically, the support 1 is two spaced square boxes installed on the ground. The square boxes are provided with doors. The opposite sides of the two supports 1 are parallel to each other. The midline of the distance between the two opposite sides of the two supports 1 is the midline of the two supports 1. As Figures 1-2As shown in the figure, an overfeed wheel 39 is provided on the overfeed mechanism 3. The overfeed mechanism 3 is symmetrically arranged along the center line of the bracket 1 on the bracket 1 in a mirror image manner. The width distance between the two overfeed mechanisms 3 can be adjusted. An amplitude expanding mechanism 2 is arranged between the two overfeed wheels 39. A steam box 4 is arranged above the amplitude expanding mechanism 2. The upper end of the steam box 4 is wider than the lower end. The steam box 4 is communicated with a steam inlet and outlet pipe.

[0034] As Figure 6 shown in the figure, the amplitude expanding mechanism 2 includes two amplitude expanding brackets 21 symmetrically arranged along the center line of the bracket 1 in a mirror image manner. The upper ends of the amplitude expanding brackets 21 are placed inside the steam box 4. A plurality of rollers 22 are arranged on the amplitude expanding brackets 21. The bottom of the amplitude expanding brackets 21 is bent towards the center line of the bracket 1. The amplitude expanding brackets 21 are arranged at intervals of two plates with bent fronts. The plurality of rollers 22 are clamped between the two plates of the amplitude expanding brackets 21. The overfeed wheel 39 is in rotational contact with the two rollers 22 on the amplitude expanding brackets 21.

[0035] As Figure 2 shown in the figure, a swing cloth guiding frame 8 and a fixed guiding roller 9 are sequentially arranged from front to back at the top of the side of the bracket 1. A first cloth feeding roller 5 is arranged on the bracket 1 at the bottom of the amplitude expanding mechanism 2. A second cloth feeding roller 6 is arranged on the bracket 1 above the steam box 4. A cloth discharging roller 7 is arranged on the bracket 1 behind the second cloth feeding roller 6. The rotational speed of the second cloth feeding roller 6 is greater than that of the cloth discharging roller 7. The swing cloth guiding frame 8 and the fixed guiding roller 9 are driven passively when guiding the movement of the circular knitted fabric 10. The first cloth feeding roller 5, the second cloth feeding roller 6 and the cloth discharging roller 7 are driven actively when guiding the movement of the circular knitted fabric 10.

[0036] As Figure 7 shown in the figure, the first cloth feeding roller 5 is driven by a cloth feeding motor 11. The second cloth feeding roller 6 and the cloth discharging roller 7 are both driven by a cloth discharging motor 14. The motor shaft of the cloth feeding motor 11 is connected to the shaft of the first cloth feeding roller 5 through a coupling. One end of the shaft of the cloth discharging roller 7 is connected to the motor shaft of the cloth discharging motor 14 through a coupling. A large belt pulley 15 is arranged at the other end of the shaft of the cloth discharging roller 7. A small belt pulley 16 matched with the large belt pulley 15 is arranged on the second cloth feeding roller 6. The large belt pulley 15 and the small belt pulley 16 are connected by a belt. The cloth discharging roller 7 is arranged at the upper rear of the second cloth feeding roller 6.

[0037] The cloth feeding motor 11, the cloth discharging motor 14, the large belt pulley 15 and the small belt pulley 16 are all arranged inside the square box body of the bracket 1.

[0038] As Figure 2As shown in the figure, the swing guide frame includes a first guide roller 91 and a second guide roller 92. One end of the first guide roller 91 and the second guide roller 92 is fixedly connected, and the other end of the first guide roller 91 and the second guide roller 92 is also fixedly connected. After connection, both ends of the first guide roller 91 and the second guide roller 92 are respectively rotatably connected to the upper end of the top of the bracket 1. A fixed ring 93 is arranged at intervals in the middle of the first guide roller 91 for the convergence of the cylindrical knitted fabric 10. Both ends of the fixed guide roller 9 are respectively rotatably connected to the upper end of the top of the bracket 1.

[0039] Further, the diameter ratio of the large pulley 15 to the small pulley 16 is 1.2 - 1.5:1. The second fabric feeding roller 6 gives appropriate overfeeding to the fabric take-off roller 7 to avoid uneven fabric tension caused by stretching during the fabric take-off of the fabric take-off roller 7, which in turn affects the shrinkage rate not meeting the expectations.

[0040] As Figure 7 shown in the figure, a telescopic rod is arranged between the two amplitude expansion brackets 21. The telescopic rod includes a large rod 24 and a small rod 23. The small rod 23 is embedded inside the large rod 24. A locking screw is arranged on the large rod 24 of the telescopic rod. By adjusting the telescopic amount of the large rod 24 and the small rod 23, the roller 22 of the amplitude expansion bracket 21 is brought into contact with the overfeeding wheel 39.

[0041] A further solution of the present utility model is that, as Figure 4 、 Figure 6 shown in the figure, the overfeeding mechanism 3 further includes a transmission shaft arranged on the bracket 1. Both ends of the transmission shaft are respectively rotatably connected to both ends of the bracket 1. A bearing and a bearing seat are arranged at the connection of the transmission shaft and the bracket 1. Large bevel gears 36 are symmetrically arranged along the midline of the bracket 1 on the transmission shaft. The large bevel gears 36 are connected to the transmission shaft by keys, and a sliding key groove is arranged on the transmission shaft. The large bevel gears 36 are meshed and connected with small bevel gears 37. The small bevel gears 37 are connected to the overfeeding shaft. The overfeeding wheel 39 is arranged at the end of the overfeeding shaft. The large bevel gears 36, the small bevel gears 37 and the overfeeding shaft are arranged inside the gearbox 30. The gearbox 30 only has the freedom of sliding along the length direction of the transmission shaft. The transmission shaft is driven by an overfeeding motor 13. The overfeeding motor 13 drives the transmission shaft to rotate. The transmission shaft drives the large bevel gears 36 to rotate. The large bevel gears 36 drive the small bevel gears 37 to rotate and finally drive the overfeeding wheel 39 to rotate through the overfeeding shaft.

[0042] The motor shaft of the overfeeding motor 13 is connected to the reduction box. The output shaft of the reduction box is connected to the large sprocket. One end of the transmission shaft is connected to the small sprocket. The large sprocket and the small sprocket are connected by a chain. The overfeeding motor 13, the reduction box, the large sprocket and the small sprocket are all installed inside the left bracket 1.

[0043] The described overfeeding mechanism 3 further includes a lead screw 33 disposed on the bracket 1. The two ends of the lead screw 33 are respectively rotatably connected to the two ends of the bracket 1. Bearings and bearing seats are provided at the connection between the lead screw 33 and the bracket 1. Threads are symmetrically arranged along the center line of the bracket 1 on the lead screw 33, and the directions of the threads on both sides of the center line of the bracket 1 are opposite. Sliders 34 are engaged with the threads. The sliders 34 are fixedly connected to the gearbox 30. The lead screw 33 is driven by a lateral adjustment motor 12. The lateral adjustment motor 12 is a stepping motor. By driving the lead screw 33 to rotate through the lateral adjustment motor 12, the lead screw 33 drives the sliders 34 on both sides to move relatively or towards each other simultaneously, thereby driving the gearbox 30 and the overfeeding wheel 39 to move. The lateral adjustment motor 12 and one end of the lead screw 33 are connected by large and small bevel gears for steering. The lateral adjustment motor 12 is installed inside the right bracket 1.

[0044] The described overfeeding mechanism 3 further includes a fixed rod 31 disposed on the bracket 1. The two ends of the fixed rod 31 are respectively fixedly connected to the two ends of the bracket 1. Sliding rings 32 are symmetrically arranged along the center line of the bracket 1 on the fixed rod 31. The sliding rings 32 are slidably connected to the fixed rod 31. The sliding rings 32 are fixedly connected to the gearbox 30.

[0045] The drive shaft, the lead screw 33 and the fixed rod 31 are located on the same vertical line, and the lead screw 33 is disposed in the middle of the drive shaft and the fixed rod 31. The fixed rod 31 is disposed relatively above the bracket 1, and the drive shaft is disposed relatively below the bracket 1.

[0046] The gearbox 30, the sliders 34 and the sliding rings 32 are integrally designed from bottom to top.

[0047] Through the above technical solution, the drive shaft, the lead screw 33 and the fixed rod 31 are located on the same vertical line, which can reduce the rotation of the amplitude expansion mechanism 2 caused by the centrifugal force generated by the rotation of the overfeeding wheel 39, making the overfeeding mechanism 3 and the amplitude expansion mechanism 2 relatively stable, and thus producing better effects.

[0048] Working principle:

[0049] Through the above technical solution, as Figure 3As shown in the figure, the device is installed at the front end of a blanket-type pre-shrinking and finishing machine. The pretreated cylindrical knitted fabric 10 is folded and placed, and passes through the swing guide frame above and the fixed guide roller 9 in sequence. After passing through the first fabric-feeding roller at the bottom, the cylindrical knitted fabric 10 is sleeved on the fabric expanding mechanism 2. The linear speed of the overfeed roller 39 is greater than the speed of the subsequent fabric-discharging roller 7. Therefore, the overfeed roller 39 feeds the cylindrical knitted fabric 10 into the steam box 4 in a slack state according to the required overfeed amount. The steam box 4 sprays hot steam on both sides of the cylindrical knitted fabric 10 at the same time, gradually releasing the internal stress and restoring the coils to the state before water washing to obtain preliminary shaping. Finally, it enters the pre-shrinking and finishing process for subsequent overfeeding to obtain the final shaping.

[0050] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be construed as limiting the claimed rights.

Claims

1. A fabric width expanding device, characterized in that: It includes a bracket (1), a fabric width expanding mechanism (2) and an overfeed mechanism (3). An overfeed roller (39) is provided on the overfeed mechanism (3). The overfeed mechanism (3) is symmetrically arranged on the bracket (1) along the midline of the bracket (1). A fabric width expanding mechanism (2) is arranged between the two overfeed rollers (39). A steam box (4) is provided above the fabric width expanding mechanism (2). The fabric width expanding mechanism (2) includes two fabric width expanding brackets (21) that are symmetrically arranged along the midline of the bracket (1). A plurality of rollers (22) are provided on the fabric width expanding brackets (21). The lower ends of the fabric width expanding brackets (21) are bent towards the midline of the bracket (1). The overfeed roller (39) is in rotational contact with two rollers (22) on the fabric width expanding bracket (21). A swing cloth guiding frame (8) and a fixed guiding roller (9) are successively arranged from front to back at the top on the side of the bracket (1). A first fabric feeding roller (5) is provided on the bracket (1) at the bottom of the fabric width expanding mechanism (2). A second fabric feeding roller (6) is provided on the bracket (1) above the steam box (4). A fabric discharging roller (7) is provided on the bracket (1) behind the second fabric feeding roller (6). The rotational speed of the second fabric feeding roller (6) is greater than that of the fabric discharging roller (7). The swing cloth guiding frame (8) and the fixed guiding roller (9) are driven passively when guiding the movement of the circular knitted fabric (10). The first fabric feeding roller (5), the second fabric feeding roller (6) and the fabric discharging roller (7) are driven actively when guiding the movement of the circular knitted fabric (10).

2. The fabric width expanding device according to claim 1, characterized in that: An expansion rod is arranged between the two fabric width expanding brackets (21). The expansion rod includes a large rod (24) and a small rod (23). The small rod (23) is embedded inside the large rod (24).

3. The fabric width expanding device according to claim 2, wherein: The overfeed mechanism (3) further includes a transmission shaft arranged on the bracket (1). The two ends of the transmission shaft are respectively rotationally connected to the two ends of the bracket (1). Bearings and bearing seats are arranged at the connection between the transmission shaft and the bracket (1). Large bevel gears (36) are symmetrically arranged along the midline of the bracket (1) on the transmission shaft. The large bevel gears (36) are connected to the transmission shaft by keys. The large bevel gears (36) are meshed and connected with small bevel gears (37). The small bevel gears (37) are connected to an overfeed shaft. The overfeed roller (39) is arranged at the end of the overfeed shaft. The transmission shaft is driven by an overfeed motor (13).

4. A fabric width expanding device according to claim 3, characterized in that: The overfeed mechanism (3) further includes a lead screw (33) arranged on the bracket (1). The two ends of the lead screw (33) are respectively rotationally connected to the two ends of the bracket (1). Bearings and bearing seats are arranged at the connection between the lead screw (33) and the bracket (1). Threads are symmetrically arranged along the midline of the bracket (1) on the lead screw (33). The directions of the threads on both sides of the midline of the bracket (1) are opposite. Sliders (34) are fitted on the threads. The sliders (34) are fixedly connected to a gear box (30). The lead screw (33) is driven by a lateral adjustment motor (12).

5. The fabric width expanding device according to claim 4, wherein: The described overfeeding mechanism (3) further includes a fixed rod (31) disposed on the bracket (1). The two ends of the fixed rod (31) are fixedly connected to the two ends of the bracket (1) respectively. Sliding rings (32) are symmetrically arranged along the midline of the bracket (1) on the fixed rod (31). The sliding rings (32) are slidably connected to the fixed rod (31), and the sliding rings (32) are fixedly connected to the gearbox (30).

6. The fabric width expanding device according to claim 5, characterized in that: The transmission shaft, the lead screw (33) and the fixed rod (31) are located on the same vertical line, and the lead screw (33) is disposed in the middle of the transmission shaft and the fixed rod (31). The fixed rod (31) is disposed relatively above the bracket (1), and the transmission shaft is disposed relatively below the bracket (1).

7. The fabric stretching device according to claim 6, characterized in that: The gearbox (30), the slider (34) and the sliding ring (32) are integrally designed.

8. A fabric width expanding device according to any one of claims 1-7, characterized in that: The first fabric feeding roller (5) is driven by a fabric feeding motor (11). The second fabric feeding roller (6) and the fabric discharging roller (7) are both driven by a fabric discharging motor (14). The motor shaft of the fabric feeding motor (11) is connected to the shaft of the first fabric feeding roller (5) through a coupling. One end of the shaft of the fabric discharging roller (7) is connected to the motor shaft of the fabric discharging motor (14) through a coupling. A large pulley (15) is disposed at the other end of the shaft of the fabric discharging roller (7). A small pulley (16) cooperating with the large pulley (15) is disposed on the second fabric feeding roller (6). The large pulley (15) and the small pulley (16) are connected by a belt.

9. A fabric width expanding device according to claim 8, characterized in that: The described swinging fabric guiding frame (8) includes a first guiding roller (91) and a second guiding roller (92). One end of the first guiding roller (91) and the second guiding roller (92) is fixedly connected, and the other end of the first guiding roller (91) and the second guiding roller (92) is also fixedly connected. Fixed rings (93) are spaced in the middle on the first guiding roller (91). The two ends of the connected first guiding roller (91) and second guiding roller (92) are respectively rotatably connected to the upper end of the top of the bracket (1). The two ends of the fixed guiding roller (9) are respectively rotatably connected to the upper end of the top of the bracket (1).

10. A fabric width expanding device according to claim 9, characterized in that: The diameter ratio of the large pulley (15) to the small pulley (16) is 1.2 - 1.5:1.

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