Cloth feeding device

Abstract

The utility model provides a cloth feeding device. The cloth feeding device comprises a rack, a cloth unwinding roller, a cloth winding roller, a driving roller, a tidying mechanism and two printing devices, the cloth unwinding roller, the cloth winding roller and the driving roller are all rotatably arranged on the rack, the driving roller is arranged between the cloth unwinding roller and the cloth winding roller, and the driving roller is used for driving a printing material to be conveyed between the cloth unwinding roller and the cloth winding roller; the two printing devices are arranged between the cloth unwinding roller and the cloth winding roller in a spaced mode, and printing heads of the two printing devices correspond to the two opposite faces of a printing material so as to print the two faces of the printing material at the same time; the tidying mechanism is arranged at the position of the driving roller, and the tidying mechanism enables the printing materials to be flat and aligned by increasing the friction force between the printing materials and the driving roller. According to the utility model, the two printing devices realize double-sided printing of the printing material, and the tidying mechanism increases the friction force between the printing material and the driving roller, so that the printing material is stressed consistently in the conveying process, and the phenomena of deviation, pleat formation and the like of the printing material are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to printing technical field, specifically, relate to a cloth feeding device. BACKGROUND

[0002] At present, there are two cloth feeding modes for roll material plotter, collectively called clamping cloth feeding. Figure 1 One is to drive the material stepping through the clamping force of the driving roller 1' and the clamp roller 2' (the one connected with the driving motor is the driving roller); Figure 2 The other is to drive the material stepping through the clamping force of the small pressure roller 3' and the driving roller 1' (the one connected with the driving motor is the driving roller). In the above two cloth feeding modes, when the take-up roller and the release roller are in a free state, the driving roller drives the material stepping by relying on the clamping force, which has the advantages of being able to cut the printed material at any time, and being more flexible in printing part of the roll or the whole roll; and the disadvantages of being difficult to guarantee the consistency of the clamping force everywhere, and being prone to cause the material to deviate and wrinkle. SUMMARY

[0003] Therefore, the utility model provides a cloth feeding device, which aims at solving the problem of the clamping cloth feeding mode in the prior art being prone to causing the material to deviate and wrinkle.

[0004] The utility model provides a cloth feeding device, which comprises a rack, a release roller, a take-up roller, a driving roller, a straightening mechanism and two printing devices; wherein the release roller, the take-up roller and the driving roller are rotatably arranged on the rack, the driving roller is arranged between the release roller and the take-up roller, and the driving roller is used to drive the printing material to convey between the release roller and the take-up roller; the two printing devices are arranged at intervals between the release roller and the take-up roller, the printing heads of the two printing devices correspond to the opposite two sides of the printing material respectively, so as to print the two sides of the printing material at the same time; the straightening mechanism is arranged at the driving roller, and the straightening mechanism is used to increase the friction between the printing material and the driving roller to make the printing material flat and aligned.

[0005] Further, in the above-mentioned cloth feeding device, the straightening mechanism is used to increase the contact area between the printing material and the driving roller to increase the friction between the printing material and the driving roller.

[0006] Further, in the above-mentioned cloth feeding device, the straightening mechanism comprises an angle wrapping roller and a guide roller; wherein the angle wrapping roller and the guide roller are rotatably arranged on the rack and arranged on the two sides of the driving roller respectively, and the center line between the center of the driving roller and the center of the angle wrapping roller and the guide roller has a preset included angle, so that the printing material at least wraps around one half of the circumference of the driving roller.

[0007] Furthermore, in the above-mentioned fabric feeding device, there are at least two active rollers, each of which is spaced apart between the fabric feeding roller and the fabric receiving roller; there are at least two tidying mechanisms, each of which is correspondingly located at each active roller.

[0008] Furthermore, in the above-mentioned feeding device, each active roller is connected to a drive mechanism, and each drive mechanism is used to drive the corresponding active roller to rotate; or, two adjacent active rollers form a roller group, and one of the active rollers in each roller group is connected to a drive mechanism, which is used to drive the active roller connected to it to rotate, thereby driving the other active roller to rotate.

[0009] Furthermore, the aforementioned fabric feeding device also includes a tension adjusting mechanism; wherein the tension adjusting mechanism is used to adjust the tension of the printing material.

[0010] Furthermore, in the aforementioned fabric feeding device, the tension adjustment mechanism includes: two tension adjustment components; wherein the two tension adjustment components correspond one-to-one with the feed roller and the take-up roller; each tension adjustment component includes: a transmission mechanism, a motor, a clutch, and a tension controller; wherein the tension controller is connected to the clutch; the motor in one tension adjustment component is connected to the feed roller via the clutch and the transmission mechanism, and the motor in the other tension adjustment component is connected to the take-up roller via the clutch and the transmission mechanism; each tension controller is used to adjust the output torque of the corresponding clutch to achieve tension adjustment of the feed roller or the take-up roller.

[0011] Furthermore, in the above-mentioned fabric feeding device, the tension adjustment mechanism includes: a control system, an identification device, and two drive motors; wherein, the identification device is used to identify the transmission parameters of the printing material; the two drive motors are respectively connected to the take-up roller and the release roller; the control system is electrically connected to the identification device and each drive motor, and the control system is used to receive the transmission parameters, calculate the output torque according to the transmission parameters, and control the rotation of each drive motor according to the calculated output torque.

[0012] Furthermore, the above-mentioned fabric feeding device also includes: an auxiliary conveying mechanism disposed on the frame; wherein the auxiliary conveying mechanism is disposed corresponding to the active roller and is used to assist the active roller in conveying printing material.

[0013] Furthermore, in the above-mentioned fabric feeding device, the auxiliary conveying mechanism includes: a drive structure and a clamping roller; wherein, the clamping roller is arranged opposite to the drive roller, and the clamping roller is rotatably connected to the drive structure. The clamping roller is used to move away from or closer to the drive roller under the drive of the drive structure. After the clamping roller moves closer to the drive roller, there is a clamping gap between the clamping roller and the drive roller. The clamping gap is used to clamp and convey the printing material.

[0014] The utility model discloses, through the active roller to print material is sent, makes print material stable transmission between the cloth roll and the cloth roll, and the print head of two printing devices is corresponding with the two sides of print material respectively, can print the two sides of print material simultaneously, realized the double -sided printing of print material, and the friction between the print material and the active roller can be increased by the neat mechanism, so, print material is sent by the friction between the active roller, and the cloth roll and cloth roll always keep the tension state, then the force of print material is consistent in the transmission process, avoids the phenomenon such as print material and goes off -track, and the problem that the phenomenon such as going off -track, going off -track of material of clamping cloth mode in the prior art is easily led to is solved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to limit the present inventive subject matter. The same reference numerals in different drawings represent the same or similar elements. In the drawings:

[0016] Figure 1 It is a structure schematic view of the clamping cloth device in the prior art;

[0017] Figure 2 It is still a structure schematic view of the clamping cloth device in the prior art;

[0018] Figure 3 It is a structure schematic view of the cloth feeding device provided by the utility model embodiment;

[0019] Figure 4 It is a structure block diagram of the cloth feeding device provided by the utility model embodiment. DETAILED DESCRIPTION

[0020] Exemplary embodiments of the present disclosure will be described below in greater detail with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood and so that the scope of the present disclosure can be accurately conveyed to those skilled in the art. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0021] Reference Figure 3The preferred structure of the cloth feeding device is shown in the figure. As shown in the figure, the cloth feeding device comprises a rack, a cloth releasing roller 1, a cloth collecting roller 2, a driving roller 3, a straightening mechanism 4 and two printing devices 9. The cloth releasing roller 1, the cloth collecting roller 2 and the driving roller 3 are rotatably arranged on the rack, so that the cloth releasing roller 1, the cloth collecting roller 2 and the driving roller 3 can rotate, and the driving roller 3 is arranged between the cloth releasing roller 1 and the cloth collecting roller 2. The cloth releasing roller 1 is used for winding one end of the printing material 5, the cloth collecting roller 2 is used for winding the other end of the printing material 5, the printing material 5 is in contact with the driving roller 3, and the driving roller 3 is used for driving the printing material 5 to convey between the cloth releasing roller 1 and the cloth collecting roller 2, so that the printing material 5 moves between the cloth releasing and the cloth collecting through the rotation of the cloth releasing roller 1, the cloth collecting roller 2 and the driving roller 3.

[0022] In the process of conveying the printing material 5, the cloth collecting roller 2 and the cloth releasing roller 1 always maintain a tension state to ensure stable conveying of the printing material 5.

[0023] In specific implementation, the driving mechanism is arranged at the driving roller 3, which drives the driving roller 3 to rotate and further drives the printing material 5 to convey. The driving mechanism can be a motor.

[0024] The two printing devices 9 are arranged at intervals, and the two printing devices 9 are arranged between the cloth releasing roller 1 and the cloth collecting roller 2, and the two printing devices 9 are arranged on the two sides of the driving roller 3, respectively. The printing heads of the two printing devices 9 correspond to the opposite two surfaces of the printing material 5, respectively. Specifically, the printing material 5 has two opposite surfaces, the printing head of one of the two printing devices 9 corresponds to one of the surfaces of the printing material 5, and the printing head of the other of the two printing devices 9 corresponds to the other surface of the printing material 5, so that the two printing devices 9 can print on the two surfaces of the printing material 5 at the same time. The cloth collecting roller 2 collects the printed printing material 5.

[0025] The straightening mechanism 4 is arranged at the driving roller 3, and the straightening mechanism 4 is used for increasing the friction between the printing material 5 and the driving roller 3, so that the printing material 5 is conveyed by the friction between the printing material 5 and the driving roller 3, and the printing material 5 is flat and aligned, avoiding the phenomena of deviation and wrinkle of the printing material 5.

[0026] It can be seen that, in the embodiment, the printing material 5 is conveyed by the driving roller 3, so that the printing material 5 is stably conveyed between the cloth feeding roller 1 and the cloth collecting roller 2, the printing heads of the two printing devices 9 are respectively opposite to the two surfaces of the printing material 5 one by one, and the two surfaces of the printing material 5 can be printed at the same time, so that double-sided printing of the printing material is realized. The alignment mechanism 4 can increase the friction between the printing material 5 and the driving roller 3. In this way, the printing material 5 is conveyed by the friction between the printing material 5 and the driving roller 3, and the cloth feeding roller 1 and the cloth collecting roller 2 always maintain a tension state, so that the printing material 5 is uniformly stressed during conveying, and the problems of deviation and wrinkling of the printing material 5 are avoided.

[0027] Referring to Figure 3 and Figure 4 In the above embodiment, the alignment mechanism 4 is used to increase the contact area between the printing material 5 and the driving roller 3, so as to increase the friction between the printing material 5 and the driving roller 3. Specifically, when the printing material 5 is conveyed under the action of the driving roller 3, the contact area between the printing material 5 and the driving roller 3 is increased when the printing material 5 is wound around the driving roller 3, so that the friction between the printing material 5 and the driving roller 3 is increased, and the printing material 5 is flat and aligned.

[0028] The alignment mechanism 4 can include a wrap angle roller 41 and a cloth guide roller 42. The wrap angle roller 41 and the cloth guide roller 42 are both rotatably arranged on the rack, and are both used to contact the printing material 5. The printing material 5 is wound around the wrap angle roller 41 and the cloth guide roller 42, and the wrap angle roller 41 and the cloth guide roller 42 both convey the printing material 5. The wrap angle roller 41 and the cloth guide roller 42 are respectively arranged on both sides of the driving roller 3, and the center line between the center of the driving roller 3 and the center of the wrap angle roller 41 and the center of the cloth guide roller 42 has a preset included angle, so that the printing material 5 is wound around at least one half of the circumference of the driving roller 3. Specifically, the center line between the center of the wrap angle roller 41 and the center of the driving roller 3 is referred to as a first center line, the center line between the center of the cloth guide roller 42 and the center of the driving roller 3 is referred to as a second center line, and the first center line and the second center line have a preset included angle.

[0029] Preferably, the included angle between the first center line and the second center line is less than 90°, so that the positions of the wrap angle roller 41 and the cloth guide roller 42 are both on the same side of the driving roller 3. In this way, the printing material 5 can be wound around the circumference of the driving roller 3 more, effectively increasing the contact area between the printing material 5 and the driving roller 3, and further increasing the friction between the printing material 5 and the driving roller 3.

[0030] In practice, the positions of the wrap angle roller 41 and the guide roller 42 can be determined according to actual conditions, as long as the printing material 5 can wrap around more than half of the circumference of the driving roller 3, and the present embodiment does not limit the positions of the wrap angle roller 41 and the guide roller 42.

[0031] In practice, the preset included angle can be an acute angle, as long as the printing material 5 can wrap around more than half of the circumference of the driving roller 3 when wrapping around the driving roller 3, and the present embodiment does not limit the angle of the preset included angle.

[0032] It can be seen that, in the present embodiment, the arrangement of the wrap angle roller 41 and the guide roller 42 can make the printing material 5 generate a larger wrap angle area on the driving roller 3, and by limiting the included angle of the lines connecting the center of the driving roller 3 with the center of the wrap angle roller 41 and the center of the guide roller 42, respectively, it is ensured that the printing material 5 wraps around more than half of the circumference of the driving roller 3, which can effectively increase the contact area between the printing material 5 and the driving roller 3, and further increase the friction between the printing material 5 and the driving roller 3, thereby ensuring that the driving roller 3 stably conveys the printing material 5, and ensuring that the printing material 5 is flat and aligned during the conveying process.

[0033] Referring to Figure 3 and Figure 4 In the above embodiments, the driving roller 3 is at least two, and each driving roller 3 is arranged at intervals, that is, any two adjacent driving rollers 3 have a preset distance. In practice, the distance between any two adjacent driving rollers 3 can be the same or different, and the distance can be determined according to actual conditions, and the present embodiment does not limit this. Each driving roller 3 is arranged between the cloth feeding roller 1 and the cloth collecting roller 2.

[0034] The alignment mechanism 4 is at least two, and the number of the alignment mechanism 4 is the same as the number of the driving roller 3, and each alignment mechanism 4 corresponds to each driving roller 3, and each alignment mechanism 4 is arranged at the corresponding driving roller 3, and each alignment mechanism 4 is used to increase the friction between the printing material 5 and the corresponding driving roller 3, so that the printing material 5 is conveyed by the friction between the printing material 5 and the driving roller 3, and the printing material 5 is flat and aligned, avoiding the printing material 5 from being skewed or wrinkled. The guide rollers 42 in any two adjacent alignment mechanisms 4 are shared, and the guide roller 42 is arranged between the two driving rollers 3, so that the guide roller 42 is commonly arranged, that is, the two driving rollers 3 share one guide roller 42. Specifically, since the wrap angle roller 41 and the guide roller 42 are arranged at each driving roller 3, so that there are two wrap angle rollers 41 and two guide rollers 42 in the two adjacent driving rollers 3, then one of the guide rollers 42 can be omitted, and the remaining guide roller 42 is arranged between the two driving rollers 3.

[0035] In practice, the number of driving rollers 3 can be determined according to actual conditions, and the embodiment does not make any limitation on this. In the embodiment, the driving rollers 3 are two. Correspondingly, the alignment mechanism 4 is two, and the angle roller 41 is two and the guide roller 42 is one.

[0036] In practice, one of the printing devices 9 is arranged between the two driving rollers 3, and the other printing device 9 is arranged between the cloth feeding roller 1 and the adjacent driving roller 3.

[0037] In the above embodiment, each driving roller 3 can be connected with a driving mechanism, and each driving mechanism is used to drive the corresponding driving roller 3 to rotate. That is, the number of driving rollers 3 is the same as the number of driving mechanisms and one-to-one correspondence, and each driving mechanism drives the corresponding driving roller 3 to rotate. Alternatively, the adjacent two driving rollers 3 form a roller group, and a transmission structure is arranged between the two driving rollers 3. One of the driving rollers 3 in each roller group is connected with a driving mechanism, and the other driving roller 3 is no longer connected with the driving mechanism, but as a driven roller. In this way, the number of driving mechanisms is the same as the number of roller groups and one-to-one correspondence, and the driving mechanism in each roller group drives the driving roller 3 connected with it to rotate, and further drives the driven roller to rotate, so that all the driving rollers 3 are in a rotating state. In practice, each driving mechanism can be a motor.

[0038] In the above embodiment, the tension of the printing material 5 will change to a certain extent during the printing process, and the cloth feeding device can further include a tension adjusting mechanism. The tension adjusting mechanism is used to adjust the tension of the printing material 5, so that the tension of the printing material 5 remains unchanged during the printing process, thereby ensuring the stable transmission of the printing material 5. Specifically, the tension adjusting mechanism adjusts the tension of the printing material 5 by adjusting the tension of the cloth feeding roller 2 and the cloth feeding roller 1. More specifically, the tension adjusting mechanism adjusts the tension between the cloth feeding roller 1 and the adjacent driving roller 3, and adjusts the tension between the cloth feeding roller 2 and the adjacent driving roller 1.

[0039] The tension adjusting mechanism can be manually adjusted or automatically adjusted. The manual adjustment embodiment is that the tension adjusting mechanism can include two tension adjusting components (not shown in the figure). The two tension adjusting components are one-to-one corresponding to the cloth feeding roller 1 and the cloth feeding roller 2, that is, the cloth feeding roller 1 corresponds to one tension adjusting component, and the cloth feeding roller 2 corresponds to one tension adjusting component.

[0040] Each tension adjusting assembly can include a transmission mechanism, a motor, a clutch and a tension controller. The tension controller is connected with the clutch, and the tension controller is used for adjusting the output torque of the clutch. The motor in one of the tension adjusting assemblies is connected with the unwinding roller 1 through the clutch and the transmission mechanism, and the motor in the other tension adjusting assembly is connected with the winding roller 2 through the clutch and the transmission mechanism. Each tension controller adjusts the output torque of the corresponding clutch to realize the tension adjustment of the unwinding roller 1 or the winding roller 2.

[0041] In specific implementation, the motor can be a torque motor or a clutch motor or a servo motor, and the embodiment does not limit the structure of the motor. The clutch can be a magnetic powder clutch. Preferably, each tension controller is a knob type. In this way, the staff can manually control the two tension controllers to adjust the tension of the printing material 5, and the structure is simple and easy to implement.

[0042] The automatic adjustment of the tension adjusting mechanism is as follows: Figure 4 The tension adjusting mechanism can include a control system 6, an identification device 7 and two drive motors 8. The identification device 7 is used to identify the conveying parameters of the printing material 5, wherein the conveying parameters include the diameter size and the tension of the printing material 5. The two drive motors 8 are connected with the unwinding roller 1 and the winding roller 2 one by one, that is, one of the drive motors 8 is connected with the unwinding roller 1 to drive the unwinding roller 1 to rotate, and the other drive motor 8 is connected with the winding roller 2 to drive the winding roller 2 to rotate.

[0043] The control system 6 is electrically connected with the identification device 7 and each drive motor 8, and the control system 6 is used to receive the conveying parameters sent by the identification device 7, calculate the output torque according to the conveying parameters, and control each drive motor 8 to rotate according to the calculated output torque, thereby driving the unwinding roller 1 and the winding roller 2 to rotate. The calculated output torque should be able to ensure that the tension of the printing material 5 remains unchanged during the conveying process after the unwinding roller 1 and the winding roller 2 rotate.

[0044] Preferably, the control system 6 is a PLC control system. Preferably, the drive motor 8 is a servo motor.

[0045] As can be seen, in the embodiment, the identification device 7 identifies the conveying parameters of the printing material 5, the control system 6 calculates the output torque of each drive motor 8 according to the conveying parameters, and ensures that each drive motor 8 rotates at the calculated output torque to drive the rotation of the winding roller 2 and the unwinding roller 1, so that the printing material 5 can maintain the tension unchanged during the conveying process.

[0046] In the above embodiments, the fabric feeding device can further comprise an auxiliary conveying mechanism (not shown in the drawings). The auxiliary conveying mechanism is arranged on the frame. The auxiliary conveying mechanism is arranged corresponding to the driving roller 3, and is used to assist the driving roller 3 in conveying the printing material 5, so as to ensure that the printing material 5 can be conveyed stably.

[0047] The auxiliary conveying mechanism can comprise a driving structure and a fabric clamping roller. The fabric clamping roller is arranged opposite to the driving roller 3. The driving mechanism is arranged on the frame, and the driving structure is rotatably connected with the fabric clamping roller. The driving structure is used to drive the fabric clamping roller to move away from the driving roller 3 or to move close to the driving roller 3. After the fabric clamping roller moves close to the driving roller 3, a clamping gap is formed between the fabric clamping roller and the driving roller 3, which is used to clamp and convey the printing material 5. Specifically, when it is necessary to feed the printing material 5 (i.e., to mount the printing material on the fabric feeding device), the fabric clamping roller moves close to the driving roller 3. At this time, the gap between the fabric clamping roller and the driving roller 3 can clamp the printing material 5, and both the fabric clamping roller and the driving roller 3 can rotate to convey the printing material 5. When the printing material 5 is printed by the printing device 9, the fabric clamping roller moves away from the driving roller 3. At this time, the printing material 5 only winds around the driving roller 3.

[0048] In a specific implementation, the driving end of the driving structure is connected with a support, and the support is rotatably connected with the fabric clamping roller. In this way, the driving structure drives the support to move, so as to drive the fabric clamping roller to move and ensure the rotation of the fabric clamping roller.

[0049] In a specific implementation, the position of the fabric clamping roller at the driving roller 3 can be determined according to actual conditions, as long as the printing material 5 can be conveyed from the gap between the fabric clamping roller and the driving roller 3 after the fabric clamping roller moves close to the driving roller 3. The present embodiment does not limit the position of the fabric clamping roller.

[0050] Preferably, the driving structure is a driving cylinder. The driving cylinder is rotatably connected with the fabric clamping roller, and is used to drive the fabric clamping roller to move away from or close to the driving roller 3.

[0051] In the present embodiment, the fabric clamping roller is arranged below the driving roller 3 (relative to the Figure 3 The driving cylinder is used to drive the fabric clamping roller to ascend and descend.

[0052] Preferably, the auxiliary conveying mechanism is at least two, and each auxiliary conveying mechanism is arranged on the frame. The number of the auxiliary conveying mechanisms is the same as the number of the driving rollers 3. Each auxiliary conveying mechanism is arranged corresponding to each driving roller 3, and each auxiliary conveying mechanism is used to assist the corresponding driving roller 3 in conveying the printing material 5, so as to ensure that the printing material 5 can be conveyed stably.

[0053] It can be seen that in the embodiment, the cloth clamping roller in the auxiliary conveying mechanism moves to the position close to the driving roller 3, the printing material 5 passes through the clamping gap between the cloth clamping roller and the driving roller 3, and the printing material 5 is conveyed by the clamping force between the cloth clamping roller and the driving roller 3, thereby assisting the driving roller 3 to convey the printing material 5.

[0054] In summary, in the embodiment, the driving roller 3 conveys the printing material 5, so that the printing material 5 is stably conveyed between the cloth feeding roller 1 and the cloth collecting roller 2, the two printing devices can simultaneously print on both sides of the printing material 5, the double-sided printing of the printing material is realized, the alignment mechanism 4 can increase the friction force between the printing material 5 and the driving roller 3, so that the printing material 5 is conveyed by the friction force between the printing material 5 and the driving roller 3, and the cloth collecting roller 2 and the cloth feeding roller 1 always maintain the tension state, so that the printing material 5 is uniformly stressed during the conveying process, and the phenomena of deviation and folding of the printing material 5 are avoided.

[0055] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Therefore, if these modifications and variations of the present application belong to the scope of the claims of the present application and the equivalent technology, the present application also intends to include these modifications and variations.

Claims

1. A fabric feeding device, characterized in that, The printing device comprises a frame, a cloth feeding roller (1), a cloth collecting roller (2), a driving roller (3), a straightening mechanism (4) and two printing devices (9); wherein, The cloth feeding roller (1), the cloth collecting roller (2) and the driving roller (3) are rotatably arranged on the frame, the driving roller (3) is arranged between the cloth feeding roller (1) and the cloth collecting roller (2), and the driving roller (3) is used to drive the printing material (5) to convey between the cloth feeding roller (1) and the cloth collecting roller (2); The two printing devices (9) are arranged at intervals between the cloth feeding roller (1) and the cloth collecting roller (2), the printing heads of the two printing devices (9) correspond to the opposite two sides of the printing material (5) respectively, so as to print the two sides of the printing material (5) at the same time; The straightening mechanism (4) is arranged at the driving roller (3), and the straightening mechanism (4) is used to make the printing material (5) flat and aligned by increasing the friction between the printing material (5) and the driving roller (3). The straightening mechanism (4) is used to increase the friction between the printing material (5) and the driving roller (3) by increasing the contact area between the printing material (5) and the driving roller (3).

2. The cloth feeding device according to claim 1, wherein The straightening mechanism (4) comprises a wrap angle roller (41) and a cloth guide roller (42); wherein, 3. The cloth feeding device according to claim 2, wherein The wrap angle roller (41) and the cloth guide roller (42) are rotatably arranged on the frame and are arranged on the two sides of the driving roller (3) respectively, and the center line between the center of the driving roller (3) and the center of the wrap angle roller (41) and the center of the cloth guide roller (42) has a preset included angle, so that the printing material (5) at least wraps around one half of the circumference of the driving roller (3).

4. The cloth feeding device according to any one of claims 1 to 3, wherein, The driving roller (3) is at least two, and each driving roller (3) is arranged at intervals between the cloth feeding roller (1) and the cloth collecting roller (2); The straightening mechanism (4) is at least two, and each straightening mechanism (4) is arranged at each driving roller (3) one by one.

5. The cloth feeding device according to claim 4, wherein, Each driving roller (3) is connected with a driving mechanism, and each driving mechanism is used to drive the corresponding driving roller (3) to rotate; or, Two adjacent driving rollers (3) form a roller group, one driving roller (3) in each roller group is connected with a driving mechanism, and the driving mechanism is used to drive the driving roller (3) connected therewith to rotate and further drive the other driving roller (3) to rotate. Further comprising:

6. The cloth feeding device according to claim 1, wherein A tension adjusting mechanism; wherein, The tension adjusting mechanism is used to adjust the tension of the printing material (5). The tension adjusting mechanism comprises two tension adjusting components; wherein, 7. The cloth feeding device according to claim 6, wherein The two tension adjusting components correspond to the cloth feeding roller (1) and the cloth collecting roller (2) one by one respectively. ​ Each of the tension adjusting assemblies comprises a transmission mechanism, a motor, a clutch and a tension controller; the tension controller is connected with the clutch; the motor in one of the tension adjusting assemblies is connected with the unwinding roller (1) through the clutch and the transmission mechanism, and the motor in the other tension adjusting assembly is connected with the winding roller (2) through the clutch and the transmission mechanism; Each of the tension controllers is used for adjusting the output torque of the corresponding clutch, so as to realize the tension adjustment of the unwinding roller (1) or the winding roller (2).

8. The cloth feeding device according to claim 6, wherein The tension adjusting mechanism comprises a control system (6), an identification device (7) and two driving motors (8); wherein, The identification device (7) is used for identifying the conveying parameter of the printing material (5); The two driving motors (8) are connected with the unwinding roller (1) and the winding roller (2) in a one-to-one manner respectively; The control system (6) is electrically connected with the identification device (7) and each of the driving motors (8), the control system (6) is used for receiving the conveying parameter, calculating the output torque according to the conveying parameter, and controlling the rotation of each of the driving motors (8) according to the calculated output torque.

9. The cloth feeding device according to claim 1, wherein Further comprising: An auxiliary conveying mechanism arranged on the rack; wherein, The auxiliary conveying mechanism is arranged corresponding to the driving roller (3) and is used for assisting the driving roller (3) to convey the printing material (5).

10. The cloth feeding device according to claim 9, wherein The auxiliary conveying mechanism comprises a driving structure and a clamping roller; wherein, The clamping roller is arranged opposite to the driving roller (3), and the clamping roller is rotatably connected with the driving structure, the clamping roller is used for moving away from or close to the driving roller (3) under the driving of the driving structure, and the clamping roller has a clamping gap with the driving roller (3) after moving close to the driving roller (3), the clamping gap is used for clamping and conveying the printing material (5).

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