A kind of conveying material tension self-adapting mechanism

Abstract

The utility model provides a kind of conveying material tension self-adaptive mechanism, including printing material;Discharge wheel, for releasing the printing material to be printed;Material collecting wheel, for accommodating the printing material that has completed printing;Printer main body, for printing, bearing and positioning printing material;Two groups of lifting roller shaft supports, lifting roller shaft support includes fixed support, fixed roller shaft support and movable roller shaft support, fixed roller shaft support is fixedly installed on the top of fixed support, movable roller shaft support is movably installed on fixed support, at least two first roller shafts are provided on fixed roller shaft support, at least two second roller shafts are provided on movable roller shaft support, printing material is wound on first roller shaft and second roller shaft with interval. The utility model passes through printing material and is wound between first roller shaft and second roller shaft with the mode of "S" shape alternately, when printing material tension changes in conveying process, movable roller shaft support will automatically move up and down due to the change of printing material tension, compensate tension fluctuation.

Description

Technical Field

[0001] This utility model relates to a material transmission device for a printer, specifically to a material tension adaptive mechanism for conveying materials. Background Technology

[0002] In modern industrial-grade digital printing equipment—including large-format inkjet printers, label printers, and digital printers specifically designed for flexible substrates (such as PET film, PVC, non-woven fabrics, and textiles)—maintaining the flatness and stability of the printing media on the printing platform is a core prerequisite for achieving high-quality output. These devices typically handle flexible materials supplied in rolls, and therefore generally employ a closed-loop or semi-closed-loop feeding system consisting of an unloading roller and a take-up roller. The basic workflow of this system is as follows: the unloading roller smoothly releases the material to be printed from the original roll; after passing through guide rollers, a tension adjustment mechanism, and the printing area, the take-up roller rewinds the printed portion into a finished roll.

[0003] Throughout the entire conveying path, the material must maintain proper tension. If the tension is too low, the material is prone to sag and droop, leading to wrinkles, shifts, stacking, or even paper jams during high-speed operation. Conversely, if the tension is too high, it can cause material stretching deformation, surface damage, and in severe cases, even breakage, especially for thin or highly elastic flexible substrates (such as ultra-thin films or elastic fabrics), where the risks are even more significant. Therefore, precise tension control is not only a guarantee of mechanical stability but also a key factor in image accuracy—especially in multi-color printing, where even micron-level positional deviations can cause color misalignment, blurring, or ghosting, severely impacting the visual quality and commercial value of the final product.

[0004] To achieve this goal, modern high-end equipment typically manages the tension level of the material in the printing section by coordinating and controlling the rotational speed, output torque, and dynamic synchronization between the feed and take-up rollers. However, in actual industrial applications, tension control faces interference from many complex variables: different materials (paper, synthetic film, fabric) have vastly different elastic moduli, surface friction coefficients, and tensile strengths; temperature and humidity fluctuations alter the physical properties of materials (such as moisture absorption and thermal shrinkage), thus affecting their tension response; as the feed roll gradually decreases in size and the take-up roll gradually increases in size, the moment of inertia and required torque continuously change, which, if not compensated for, can lead to tension drift. Traditional constant-speed or open-loop tension control strategies often struggle to dynamically adapt to different operating conditions, easily causing tension fluctuations that affect print quality and equipment stability. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide an adaptive tension mechanism for conveying materials, thereby solving the problem that traditional constant speed or open-loop tension control strategies often struggle to dynamically adapt to different working conditions.

[0006] To solve the above-mentioned technical problems, this utility model achieves the following solution:

[0007] This utility model discloses a material conveying tension adaptive mechanism, including printing material;

[0008] A feeding wheel is used to release the printing material to be printed;

[0009] A receiving wheel is used to collect the printed material that has been printed.

[0010] The printer body is used for printing, carrying, and positioning the printed material;

[0011] Two sets of lifting roller supports are respectively arranged on both sides of the printer body. The printing material is released by the feeding wheel and then conveyed to the printer body for printing after passing through one set of lifting roller supports located on the feeding side of the printer body. The printed material that has been printed passes through another set of rotating supports located on the discharge side of the printer body and is collected and stored by the receiving wheel.

[0012] The lifting roller support includes a fixed support, a fixed roller frame, and a movable roller frame. The fixed roller frame is fixedly installed on the top of the fixed support, and the movable roller frame is movably installed on the fixed support. The fixed roller frame is provided with at least two first rollers, and the movable roller frame is provided with at least two second rollers. The printing material is alternately wound around the first rollers and the second rollers.

[0013] Preferably, the fixed bracket consists of two upright plates, two crossbars and at least two connecting rods. The two crossbars are installed at the bottom of the printer body, each upright plate is installed on one of the crossbars, and the connecting rods are used to connect the two crossbars.

[0014] A pulley is provided on one side of the fixed bracket, and a timing belt is installed on the pulley. One end of the timing belt is connected to the movable roller frame, and the other end is connected to a counterweight.

[0015] Preferably, one of the vertical plates is provided with two limiting strips, and the limiting strips are located on the side of the vertical plate away from the movable roller frame;

[0016] A sliding area is formed between the two limiting strips, the pulley is positioned corresponding to the sliding area, and the counterweight moves within the sliding area.

[0017] Preferably, a connecting plate is provided on the side of the upright plate near the movable roller frame, and the connecting plate has grooves on both sides;

[0018] The movable roller frame includes two U-shaped sliders and two sliding plates. The two ends of the second roller are rotatably connected to one of the sliding plates, and the sliding plates are fixedly connected to the U-shaped sliders. The inner walls on both sides of the U-shaped sliders are provided with locking blocks, which are slidably engaged in the grooves.

[0019] Preferably, the material tension adaptive mechanism further includes a control host and a first motor and a second motor controlled by the control host, wherein the first motor drives the feeding wheel to rotate and the second motor drives the receiving wheel to rotate;

[0020] At least one slotted photoelectric switch is installed on the top and bottom of the same side of the upright plate, and the slotted photoelectric switch is electrically connected to the control host.

[0021] One of the slide plates has a baffle on the side near the slotted photoelectric switch, and the baffle corresponds to the position of the sensing slot on the slotted photoelectric switch. During the lifting and lowering of the movable roller frame, the baffle passes through the sensing slot on the slotted photoelectric switch.

[0022] Preferably, mounting grooves are provided on the top and bottom of the same side of the upright plate, and the groove-shaped photoelectric switch is mounted on the mounting groove by bolts.

[0023] Preferably, the fixed roller frame includes two fixing plates, each of which is installed on the top of one of the vertical plates;

[0024] Both ends of the first roller are rotatably connected to one of the fixed plates.

[0025] Preferably, a partition plate is provided at each end of the second roller shaft, and the two partition plates divide the second roller shaft into two counterweight areas and a material winding area, with the two counterweight areas located on both sides of the material winding area;

[0026] The counterweight area is used to add counterweight blocks.

[0027] Compared with the prior art, the beneficial effects of this utility model are:

[0028] 1. After being released from the unloading roller, the printing material first enters a set of lifting roller supports located on the feed side of the printer body, then enters the printer body to complete printing, and finally passes through another set of lifting roller supports on the output side, and is finally wound up by the take-up roller. The printing material is alternately wound between the first and second rollers in an "S" shape. When the tension of the printing material changes during the conveying process, such as due to mismatch in the unloading and take-up speeds, changes in roll diameter, or fluctuations in material elasticity, the movable roller support will automatically move up and down according to the changes in the tension of the printing material: when the tension increases, the printing material tightens, and the movable roller support is pulled upward; when the tension decreases, the printing material relaxes, and the movable roller support descends under its own gravity. This up-and-down displacement changes the envelope length of the printing material between the first and second rollers, thereby automatically compensating for tension fluctuations and maintaining a relatively constant tension of the printing material on the feed and output sides of the printing area on the printer body.

[0029] It should be noted that the printing material is wound around multiple first and second rollers. The advantage of this is that when the feeding roller feeds too fast or the receiving roller collects too slowly, the multiple first and second rollers can pre-buffer some of the printing material that is not delivered to the printer body when the feeding roller feeds too fast, or some of the printing material that is not collected by the receiving roller when the receiving roller collects too slowly. In addition, the movable roller frame will automatically move up and down due to the change in the length of the buffered printing material, thereby automatically compensating for tension fluctuations and maintaining a relatively constant tension of the printing material at the inlet and outlet of the printing area. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a material conveying tension adaptive mechanism according to the present invention.

[0031] Figure 2 This is a front view of a material conveying tension adaptive mechanism according to the present invention.

[0032] Figure 3 This is a schematic diagram of the lifting roller support in the material conveying tension adaptive mechanism of this utility model from a first-view perspective.

[0033] Figure 4 This is a rear view of a material conveying tension adaptive mechanism according to the present invention.

[0034] Figure 5 This is a schematic diagram of the lifting roller support in the material conveying tension adaptive mechanism of this utility model from a second perspective.

[0035] Figure 6 This is a schematic diagram of the U-shaped slider in a material conveying tension adaptive mechanism of this utility model.

[0036] The attached diagram shows the following markings: 1. Printing material; 2. Feeding wheel; 3. Receiving wheel; 4. Printer body; 5. Fixed bracket; 6. Fixed roller frame; 7. Movable roller frame; 8. Pulley; 9. Synchronous belt; 10. Counterweight; 11. Control host; 12. First motor; 13. Second motor; 51. Vertical plate; 52. Horizontal bar; 53. Connecting rod; 61. First roller; 62. Fixed plate; 71. Second roller; 72. U-shaped slider; 73. Slide plate; 500. Sliding area; 511. Limiting strip; 512. Connecting plate; 513. Slotted photoelectric switch; 514. Mounting slot; 701. Counterweight area; 702. Material winding area; 711. Isolation plate; 721. Locking block; 731. Baffle; 5121. Slide groove. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present utility model. Obviously, the embodiments described in this utility model are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0038] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0039] Example 1: The specific structure of this utility model is as follows:

[0040] like Figure 1 and Figure 2 As shown, a material conveying tension adaptive mechanism includes a printed material 1;

[0041] The feeding wheel 2 is used to release the printing material 1 to be printed;

[0042] The receiving wheel 3 is used to collect the printed material 1 that has been printed.

[0043] Printer body 4 is used for printing, carrying and positioning the printing material 1;

[0044] Two sets of lifting roller brackets are respectively set on both sides of the printer body 4. The printing material 1 is released by the feeding wheel 2 and is conveyed to the printer body 4 for printing after passing through one set of lifting roller brackets located on the feeding side of the printer body 4. The printed material 1 that has been printed passes through another set of lifting roller brackets located on the discharging side of the printer body 4 and is collected and stored by the receiving wheel 3.

[0045] The lifting roller support includes a fixed support 5, a fixed roller frame 6, and a movable roller frame 7. The fixed roller frame 6 is fixedly installed on the top of the fixed support 5, and the movable roller frame 7 is movably installed on the fixed support 5. The fixed roller frame 6 is provided with at least two first rollers 61, and the movable roller frame 7 is provided with at least two second rollers 71. The printing material 1 is alternately wound around the first rollers 61 and the second rollers 71.

[0046] In this embodiment, after the printing material 1 is released from the unloading roller 2, it first enters a set of lifting roller supports located on the feeding side of the printer body 4, then enters the printer body 4 to complete printing, and then passes through another set of lifting roller supports on the output side, finally being wound up by the take-up roller 3. The printing material 1 is alternately wound between the first roller 61 and the second roller 71 in an "S" shape. When the tension of the printing material 1 changes during the conveying process, such as due to mismatch in the unloading and take-up speeds, changes in roll diameter, or fluctuations in material elasticity, the movable roller support 7 will automatically move up and down due to the change in the tension of the printing material 1: when the tension increases, the printing material 1 tightens, and the movable roller support 7 is pulled upward; when the tension decreases, the printing material 1 relaxes, and the movable roller support 7 descends under its own gravity. This up-and-down displacement changes the envelope length of the printing material 1 between the first roller 61 and the second roller 71, thereby automatically compensating for tension fluctuations and maintaining a relatively constant tension of the printing material 1 on the feeding and output sides of the printing area on the printer body 3.

[0047] It should be noted that the printing material 1 is wound around multiple first rollers 61 and second rollers 71. The advantage of this is that when the feeding roller 2 feeds too fast or the receiving roller 3 receives too slowly, the multiple first rollers 61 and second rollers 71 can pre-buffer the printing material 1 that is not delivered to the printer body 4 when the feeding roller 2 feeds too fast, or the printing material 1 that is not collected by the receiving roller 3 when the receiving roller 3 receives too slowly. In addition, the movable roller frame 7 will automatically move up and down due to the change in the length of the buffered printing material 1, thereby automatically compensating for tension fluctuations and maintaining a relatively constant tension of the printing material 1 on the feeding side and the output side of the printing area on the printer body 3.

[0048] Furthermore, the fixed bracket 5 consists of two upright plates 51, two crossbars 52, and at least two connecting rods 53. The two crossbars 52 are installed at the bottom of the printer body 4, and each upright plate 51 is installed on one of the crossbars 52. The connecting rods 53 are used to connect the two crossbars 52. A pulley 8 is provided on one side of the fixed bracket 5, and a synchronous belt 9 is installed on the pulley 8. One end of the synchronous belt 9 is connected to the movable roller frame 7, and the other end is connected to a counterweight 10.

[0049] In this embodiment, one end of the synchronous belt 9 is connected to the movable roller frame 7, and the other end, after passing over the pulley 8, suspends a counterweight 10, forming a single-sided balancing system. Since the counterweight 10 only offsets part of the weight of the movable roller frame 7, the movable roller frame 7 still retains a downward net weight. This net weight is transmitted through the surrounding printing material 1, forming a basic pretension. When the actual tension of the material changes: if the tension of the printing material 1 increases, it overcomes the net weight, pulling the movable roller frame 7 upward; if the tension of the printing material 1 decreases, the net weight becomes dominant, and the movable roller frame 7 descends. This design ensures that the material is always in a slightly tense state, avoiding complete relaxation, while retaining sufficient floating degrees of freedom to respond to dynamic tension fluctuations. By replacing the counterweight 10 with different masses, the basic tension can be quickly adjusted, enabling rapid switching between multiple materials.

[0050] like Figure 2 As shown, further, one of the upright plates 51 is provided with two limiting strips 511, and the limiting strips 511 are located on the side of the upright plate 51 away from the movable roller frame 7; a sliding area 500 is formed between the two limiting strips 511, the pulley 8 corresponds to the position of the sliding area 500, and the counterweight 10 moves within the sliding area 500.

[0051] In this embodiment, a narrow, vertical sliding area 500 is formed between the two limiting strips 511; the pulley 8 is mounted on the upright plate 51 and aligned with the sliding area 500 in the height direction; the counterweight 10 is suspended within the sliding area 500 after passing over the pulley 8 via the synchronous belt 9, and can slide freely up and down within it. During the lifting and lowering process, the sides or edges of the counterweight 10 are clamped by the limiting strips 511, and it can only move in a straight line in the vertical direction; the limiting strips 511 act as guide rails, effectively preventing the counterweight 10 from lateral swaying or rotational deflection during operation.

[0052] like Figure 3 and Figure 6As shown, further, a connecting plate 512 is provided on the side of the upright plate 51 near the movable roller frame 7, and sliding grooves 5121 are provided on both sides of the connecting plate 512; the movable roller frame 7 includes two U-shaped sliders 72 and two sliding plates 73, and the two ends of the second roller 71 are respectively rotatably connected to one of the sliding plates 73. The sliding plates 73 are fixedly connected to the U-shaped sliders 72, and locking blocks 721 are provided on the inner walls of both sides of the U-shaped sliders 72. The locking blocks 721 are slidably locked in the sliding grooves 5121.

[0053] In this embodiment, when the tension of the printing material 1 changes, the movable roller frame 7 needs to be raised and lowered in the vertical direction; the locking block 721 slides up and down in the slide groove 5121, restricting the movable roller frame 7 to move only in the vertical direction, completely constraining its lateral displacement, rotation or tilting degrees of freedom; the U-shaped slider 72 "wraps" the connecting plate 512, forming a bidirectional limiting guide method, which has strong resistance to lateral forces; the entire process of raising and lowering the movable roller frame 7 is smooth and without shaking, ensuring that the relative position between the second roller 71 and the first roller 61 always remains parallel.

[0054] like Figure 4 As shown, the adaptive material tension mechanism further includes a control host 11 and a first motor 12 and a second motor 13 controlled by the control host 11. The first motor 12 drives the feeding wheel 2 to rotate, and the second motor 13 drives the receiving wheel 3 to rotate. At least one slotted photoelectric switch 513 is installed on the top and bottom of the same side of the vertical plate 51, respectively, for detecting the upper limit and lower limit of the movable roller frame 7. The slotted photoelectric switch 513 is electrically connected to the control host 11.

[0055] One of the slide plates 73 is provided with a baffle 731 on the side near the slotted photoelectric switch 513, and the baffle 731 corresponds to the position of the sensing slot on the slotted photoelectric switch 513. During the lifting and lowering of the movable roller frame 7, the baffle 731 passes through the sensing slot on the slotted photoelectric switch 513.

[0056] In this embodiment, when the movable roller frame 7 rises and falls due to the tension change of the printing material 1, the baffle 731 moves accordingly. When the baffle 731 enters the sensing slot of the top slotted photoelectric switch 513, the slotted photoelectric switch 513 outputs a "high" signal, indicating that the movable frame has risen to the upper limit position, i.e., the tension is too high. When the baffle 731 enters the sensing slot of the bottom slotted photoelectric switch 513, the slotted photoelectric switch 513 outputs a "low" signal, indicating that the movable frame has fallen to the lower limit position, i.e., the tension is too low or the material is loose. The control host 11 reads the status of these two slotted photoelectric switches 513 in real time to determine whether the current tension exceeds the allowable range. The control host 11 adjusts the output power of the first motor 12 and the second motor 13 according to the signal output by the slotted photoelectric switch 513.

[0057] It should be noted that since multiple first rollers 61 and second rollers 71 pre-buffer a portion of the printing material 1, the control host 11 only adjusts the output power of the first motor 12 and the second motor 13 when the movable roller frame 7 moves to its upper or lower limit position. The advantage is that when the tension of the printing material 1 fluctuates within a certain range, it is not necessary to constantly adjust the output power of the first motor 12 and the second motor 13, thus extending their service life. Frequent adjustments to the output power of the first motor 12 and the second motor 13 would cause significant damage to their mechanical structure, thereby affecting their service life.

[0058] Furthermore, mounting grooves 514 are respectively provided on the top and bottom of the same side of the upright plate 51, and the groove-shaped photoelectric switch 513 is mounted on the mounting groove 514 by bolts.

[0059] In this embodiment, since the mounting groove 514 has a certain length, such as horizontal or vertical extension, the user can finely adjust the mounting height or front and rear position of the groove-type photoelectric switch 513 within a certain range. After adjustment, the baffle 731 can still accurately pass through the sensing groove during the lifting and lowering of the movable roller frame 7, but the critical position of triggering the upper and lower limit signals, i.e., the tension threshold, changes accordingly, so as to adapt to the tension window requirements of different materials.

[0060] Furthermore, the fixed roller frame 6 includes two fixed plates 62, each fixed plate 62 being installed on the top of one of the upright plates 51; both ends of the first roller 61 are rotatably connected to one of the fixed plates 62 respectively.

[0061] In this embodiment, the fixing plate 62 is directly fixed to the top of the main upright plate 51, using the upright plate as a high-rigidity base to ensure that the multiple first roller shafts 61 are strictly parallel and in a stable position. The first roller shaft 61 spans between the two fixing plates 62 and is connected by bearings to achieve low-friction rotation, ensuring that the printed material 1 moves smoothly without jamming during the process; since the fixing plate 62 is rigidly connected to the upright plate 51, the entire fixed roller shaft frame 6 constitutes a high-rigidity, non-deformable static roller assembly platform.

[0062] like Figure 5 As shown, further, a partition plate 711 is provided at each end of the second roller shaft 71. The two partition plates 711 divide the second roller shaft 71 into two counterweight areas 701 and a material winding area 702. The two counterweight areas 701 are located on both sides of the material winding area 702. The counterweight areas 701 are used to add counterweight blocks 10.

[0063] In this embodiment, an isolation plate 711 is provided at each end of the second roller shaft 71, dividing the second roller shaft 71 axially into three areas: the middle material winding area 702, where the printed material 1 actually contacts and winds around; and the two side counterweight areas 701, located outside the isolation plate 711, which do not contact the material and are dedicated to installing counterweight elements, such as ring counterweight plates or bolt-type counterweight blocks. Additional counterweights can be selectively installed on the counterweight areas 701 to balance the mass eccentricity of the second roller shaft 71 itself, such as due to processing errors or asymmetrical structures; to fine-tune the overall mass distribution of the movable roller frame 7, making its center of gravity closer to the lifting guide center, reducing the overturning moment during movement; and to compensate for changes in inertia caused by changing roller shafts of different lengths or diameters, maintaining consistent dynamic response of the system. The counterweight block 10 connected to the synchronous belt 9, together with the counterweight block 10 installed on the counterweight area 701, provides overall gravity compensation. Alternatively, the gravity of the movable roller frame 7 may be increased due to different tensions of the printed material 1.

[0064] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A material conveying tension adaptive mechanism, characterized in that, Including printed materials (1); The feeding wheel (2) is used to release the printing material (1) to be printed. The receiving wheel (3) is used to collect the printed material (1) that has been printed. The printer body (4) is used to print, carry and position the printed material (1). Two sets of lifting roller brackets are respectively set on both sides of the printer body (4). The printing material (1) is released by the feeding wheel (2) and is conveyed to the printer body (4) for printing after passing through one set of lifting roller brackets located on the feeding side of the printer body (4). The printed material (1) that has been printed passes through another set of lifting roller brackets located on the discharge side of the printer body (4) and is collected and stored by the receiving wheel (3). The lifting roller support includes a fixed support (5), a fixed roller frame (6), and a movable roller frame (7). The fixed roller frame (6) is fixedly installed on the top of the fixed support (5), and the movable roller frame (7) is movably installed on the fixed support (5). At least two first rollers (61) are provided on the fixed roller frame (6), and at least two second rollers (71) are provided on the movable roller frame (7). The printing material (1) is alternately wound around the first rollers (61) and the second rollers (71).

2. The material conveying tension adaptive mechanism as described in claim 1, characterized in that, The fixed bracket (5) consists of two upright plates (51), two crossbars (52) and at least two connecting rods (53). The two crossbars (52) are installed at the bottom of the printer body (4). Each upright plate (51) is installed on one of the crossbars (52). The connecting rods (53) are used to connect the two crossbars (52). A pulley (8) is provided on one side of the fixed bracket (5), and a timing belt (9) is installed on the pulley (8). One end of the timing belt (9) is connected to the movable roller frame (7), and the other end is connected to a counterweight (10).

3. The material conveying tension adaptive mechanism as described in claim 2, characterized in that, Two limiting strips (511) are provided on one of the vertical plates (51), and the limiting strips (511) are located on the side of the vertical plate (51) away from the movable roller frame (7). A sliding area (500) is formed between the two limiting strips (511), the pulley (8) is positioned corresponding to the sliding area (500), and the counterweight (10) moves within the sliding area (500).

4. The material conveying tension adaptive mechanism as described in claim 2, characterized in that, A connecting plate (512) is provided on the side of the upright plate (51) near the movable roller frame (7), and grooves (5121) are provided on both sides of the connecting plate (512). The movable roller frame (7) includes two U-shaped sliders (72) and two sliding plates (73). The two ends of the second roller (71) are rotatably connected to one of the sliding plates (73). The sliding plate (73) is fixedly connected to the U-shaped slider (72). The inner walls on both sides of the U-shaped slider (72) are provided with locking blocks (721), and the locking blocks (721) are slidably locked in the slide groove (5121).

5. The material conveying tension adaptive mechanism as described in claim 4, characterized in that, The material conveying tension adaptive mechanism also includes a control host (11) and a first motor (12) and a second motor (13) controlled by the control host (11). The first motor (12) drives the feeding wheel (2) to rotate, and the second motor (13) drives the receiving wheel (3) to rotate. At least one slotted photoelectric switch (513) is installed on the top and bottom of the same side of the upright plate (51), and the slotted photoelectric switch (513) is electrically connected to the control host (11). One of the slide plates (73) is provided with a baffle (731) on the side near the slotted photoelectric switch (513), and the baffle (731) corresponds to the position of the sensing slot on the slotted photoelectric switch (513). During the lifting and lowering of the movable roller frame (7), the baffle (731) passes through the sensing slot on the slotted photoelectric switch (513).

6. The material conveying tension adaptive mechanism as described in claim 5, characterized in that, The top and bottom of the same side of the upright plate (51) are respectively provided with mounting grooves (514), and the groove-shaped photoelectric switch (513) is installed on the mounting groove (514) by bolts.

7. The material conveying tension adaptive mechanism as described in claim 2, characterized in that, The fixed roller frame (6) includes two fixed plates (62), each of which is installed on the top of one of the vertical plates (51); The two ends of the first roller (61) are rotatably connected to a fixed plate (62).

8. The material conveying tension adaptive mechanism as described in claim 1, characterized in that, The second roller (71) is provided with a partition plate (711) at each end. The two partition plates (711) divide the second roller (71) into two counterweight areas (701) and a material winding area (702). The two counterweight areas (701) are located on both sides of the material winding area (702). The counterweight area (701) is used to add a counterweight block (10).

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