Paper feeding machine with tension adjusting device

Abstract

The paper feeding machine with the tension adjusting device comprises a shell, a front roller set and a rear roller set, the front roller set and the rear roller set are separated from each other in the shell and extend approximately in parallel, the front roller set comprises paired front rollers which are oppositely arranged at intervals, and the rear roller set comprises paired rear rollers which are oppositely arranged at intervals. The rear roller set comprises paired rear rollers which are oppositely arranged at intervals, an expandable slit sheet can sequentially penetrate through the rear roller set and the front roller set to be stretched and expanded, a tension adjusting device is arranged in the middle of the rear roller set, and the tension adjusting device is used for adjusting the tension on the expandable slit sheet. The tension adjusting device is arranged in the middle of the rear roller set and used for adjusting the tension on the slit paper, and compared with the mode that the tension adjusting device is arranged at the two ends of the rear roller set, the adjusting structure is simpler, and adjusting operation is easier and more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of paper feeding machines, and particularly relates to a paper feeding machine with a tension adjusting device. Background Art

[0002] At present, expandable coils are widely used in the packaging field. The expandable coil includes slit paper and a core tube. The slit paper is usually kraft paper, on which a plurality of parallel cut marks are formed. Each cut mark is composed of a plurality of gaps arranged at intervals, and the gaps on adjacent cut marks are arranged staggeredly. When the expandable slit sheet, i.e., the slit paper, is stretched in a direction perpendicular to the cut marks, the slits will open, causing the slit paper to expand into a three-dimensional honeycomb shape, which has a buffering effect. Therefore, the expanded expandable slit sheet is used to wrap items to prevent and reduce damage and destruction during transportation, playing a very good role in buffering, supporting and blocking, and can well protect the items.

[0003] At present, an automatic paper feeding machine is usually used to stretch the expandable slit sheet of the expandable slit coil, so that the expandable slit sheet expands. In the existing paper feeding machine, generally two sets of rollers with different rotation speeds are used to stretch the expandable slit sheet. Each set of rollers includes two rollers arranged opposite to each other. Since the rotation speeds of the two sets of rollers are different, when the expandable slit sheet passes through the two sets of rollers, the two sets of rollers will stretch the expandable slit sheet, causing the expandable slit sheet to generate tension and expand. Generally, by adjusting the pressure of the upper and lower rollers on the expandable slit sheet, the friction between the upper and lower rollers and the expandable slit sheet is adjusted, so as to adjust the tension on the expandable slit sheet and make the expandable slit sheet have different unfolding degrees. At present, the tension adjusting device of the automatic paper feeding machine has a complex structure and inconvenient operation. Summary of the Utility Model

[0004] Therefore, in view of at least one of the above problems, the utility model provides a paper feeding machine with a tension adjusting device.

[0005] The utility model is realized by the following scheme:

[0006] The utility model provides a paper feeding machine with a tension adjusting device, which includes a housing, a front roller group and a rear roller group. The front roller group and the rear roller group are spaced apart from each other in the housing and extend substantially parallel. The front roller group includes a pair of front rollers arranged relatively spaced apart, and the rear roller group includes a pair of rear rollers arranged relatively spaced apart. The expandable slit sheet can pass through the rear roller group and the front roller group in sequence and be stretched and expanded. The characteristic is that a tension adjusting device is arranged in the middle of the rear roller group, and the tension adjusting device is used to adjust the tension on the expandable slit sheet, so that the expandable slit sheet has different unfolding degrees.

[0007] Among them, in one embodiment, the tension adjusting device is used to apply a thrust to the middle of one of the pair of rear rollers to adjust the pressure of the pair of rear rollers on the slit paper, thereby adjusting the frictional force of the rear roller group on the expandable slit sheet, and thus adjusting the magnitude of the tension on the expandable slit sheet.

[0008] Among them, in one embodiment, the tension adjusting device includes an adjusting roller, and the adjusting roller abuts against the outer surface of one of the pair of rear rollers. The tension adjusting device applies the thrust to the middle of one of the pair of rear rollers through the adjusting roller.

[0009] Among them, in one embodiment, the adjusting roller is formed by arranging one or more bearings on a fixed shaft.

[0010] Among them, in one embodiment, the tension adjusting device further includes a tension adjusting knob, a mechanism adjusting limit bracket, a knob limiting member, a mechanism adjusting base, and a limiting block; the tension adjusting knob includes a knob body and a screw rod section connected to each other; an external thread is provided on the screw rod section; the knob limiting member is provided with an internal thread hole matching the external thread; the lower end of the mechanism adjusting limit bracket is hinged to the mechanism adjusting base, and the upper end of the mechanism adjusting limit bracket is rotatably connected to the adjusting roller, so that the adjusting roller can swing relative to the mechanism adjusting base following the mechanism adjusting limit bracket; a long hole is provided in the middle of the mechanism adjusting limit bracket, the screw rod section of the tension adjusting knob sequentially passes through the internal thread hole of the knob limiting member and the long hole of the mechanism adjusting limit bracket, and the limiting block is fixedly connected to the end of the screw rod section, and the mechanism adjusting limit bracket is obliquely arranged.

[0011] Among them, in one embodiment, the tension adjusting device further includes a tension adjusting knob, a mechanism adjusting limit bracket, a knob limiting member, a mechanism adjusting base, and a limiting block; the tension adjusting knob includes a knob body and a screw rod section connected to each other; an external thread is provided on the screw rod section; the knob limiting member is provided with an internal thread hole matching the external thread; the mechanism adjusting limit bracket is arranged on the mechanism adjusting base in a translatable and slidable manner; the upper end of the mechanism adjusting limit bracket is rotatably connected to the adjusting roller, so that the adjusting roller can translate and slide relative to the mechanism adjusting base following the mechanism adjusting limit bracket, and the adjusting roller is offset to one side of one of the pair of rear rollers; a through hole is provided in the middle of the mechanism adjusting limit bracket, the screw rod section of the tension adjusting knob sequentially passes through the internal thread hole of the knob limiting member and the through hole of the mechanism adjusting limit bracket, and the limiting block is fixedly connected to the end of the screw rod section.

[0012] In one embodiment, the mechanism adjustment limit bracket is provided with a first sliding structure, and the mechanism adjustment base is provided with a second sliding structure, and the first sliding structure and the second sliding structure are a set of sliders and slide rails that can slide with each other.

[0013] In one embodiment, protrusions are provided on both sides of the mechanism adjustment limit bracket as the sliding blocks, and sliding grooves are provided on both sides of the mechanism adjustment base as the sliding rails.

[0014] In one embodiment, the pair of rear rollers includes a first rear roller and a second rear roller, the first rear roller is located above the second rear roller, and the tension adjustment device is disposed below the middle of the second rear roller.

[0015] In one embodiment, the second rear roller is translationally mounted in the housing, and the second rear roller is able to translate toward or away from the first rear roller.

[0016] The technical solution provided by the utility model has the following technical effects:

[0017] 1. The utility model provides a paper feeder with a tension adjustment device, comprising a shell, a front roller group and a rear roller group, wherein the front roller group and the rear roller group are spaced apart from each other and are arranged to extend approximately in parallel in the shell, and a tension adjustment device is arranged in the middle of the rear roller group, and the tension adjustment device is used to adjust the magnitude of the tension on the expandable slit sheet material so that the expandable slit sheet material has different degrees of expansion; the tension adjustment device is arranged in the middle of the rear roller group, and is used to adjust the magnitude of the tension on the slit paper. Compared with the tension adjustment device being arranged at both ends of the rear roller group, the adjustment structure is simpler and the adjustment operation is easier.

[0018] 2. The tension adjustment device is used to apply a thrust to the middle of one of the paired rear rollers to adjust the pressure of the paired rear rollers on the slit paper, thereby adjusting the friction force of the rear roller group on the expandable slit sheet, thereby adjusting the tension on the expandable slit sheet. The adjustment structure is simpler and easier to implement, and the adjustment operation is simpler.

[0019] 3. The tension adjusting device includes an adjusting roller, which abuts against the outer surface of one of the paired rear rollers. The tension adjusting device applies the thrust to the middle of one of the paired rear rollers through the adjusting roller. The adjusting roller is formed by a plurality of bearings arranged in sequence on a fixed shaft, thereby reducing the friction between the adjusting roller and the second rear roller, making the tension adjusting device easier to adjust. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1Is a perspective view of the paper feeding machine of the first embodiment;

[0021] Figure 2 Is a perspective view of the paper feeding machine of the first embodiment with part of the housing hidden;

[0022] Figure 3 Is a perspective view of the paper feeding machine of the first embodiment from the rear direction;

[0023] Figure 4 Is a side view of the paper feeding machine of the first embodiment with part of the housing hidden;

[0024] Figure 5 Is Figure 4 The enlarged view at A in

[0025] Figure 6 Is the rear view of the paper feeding machine of the first embodiment;

[0026] Figure 7 Is Figure 6 The cross-sectional view at B - B in

[0027] Figure 8 Is Figure 7 The enlarged view at C in

[0028] Figure 9 Is the exploded view of the tension adjusting device of the first embodiment;

[0029] Figure 10 Is the full cross-sectional view of the paper feeding machine of the second embodiment;

[0030] Figure 11 Is Figure 10 The enlarged view at D in

[0031] Figure 12 Is the exploded view of the tension adjusting device of the second embodiment. Detailed implementation manners

[0032] To further illustrate each embodiment, the present utility model provides accompanying drawings. These accompanying drawings are a part of the disclosure of the present utility model, which are mainly used to illustrate the embodiments and can be combined with the relevant descriptions in the specification to explain the operating principle of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present utility model. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0033] Now, the present utility model will be further described in conjunction with the accompanying drawings and specific implementation manners.

[0034] Embodiment 1

[0035] As Figure 1-9As shown, this embodiment provides a paper feeder 1, including a housing 10, a front roller group 20, a rear roller group 30, a mounting frame 40, a tension adjustment device 50, a first mandrel 60, and a second mandrel 70. The front roller group 20 and the rear roller group 30 are spaced apart from each other and extend approximately in parallel in the housing 10. The front roller group 20 includes a first front roller 21 and a second front roller 22 that are relatively spaced apart, and the rear roller group 30 includes a first rear roller 31 and a second rear roller 32 that are relatively spaced apart.

[0036] like Figure 1-7 As shown, the front roller group 20 and the rear roller group 30 can be installed and arranged in the shell 10 by means of a mounting frame 40. A mounting frame 40 is provided at each end of the front roller group 20 and the rear roller group 30. In some embodiments, the mounting frame 40 may not be provided, that is, the mounting frame is integrated with the shell 10. In this embodiment, the mounting frame 40 extends upward out of the shell 10, and a first core shaft 60 and a second core shaft 70 are supported at its upper end. The second core shaft 70 is used to pass through and support an expandable coil, such as an expandable slit coil. The expandable slit coil is formed by winding an expandable slit sheet around a tube core. The expandable slit sheet can be, for example, slit paper. The slit paper is provided from an inlet 12 on one side of the shell 10 along the M direction (such as Figure 7 ) enters the housing 10 and passes through the rear roller group 30 and the front roller group 20 in sequence. The rear roller group 30 and the front roller group 20 have different outer circumferential linear speeds, and the outer circumferential linear speed of the front roller group 20 is greater than that of the rear roller group 30. As a result, the slit paper is stretched and expanded by tension between the front roller group 20 and the rear roller group 30, so that the length and thickness of the slit paper are increased. The expanded slit paper is discharged from the outlet 11 along the N direction (such as Figure 7 ) passes through the shell 10. The front roller group 20 is transmission-connected to a power device, such as a motor, so that the front roller group 20 acts as an active roller group to drive the slit paper to move. The rear roller group 30 is a driven roller group, and the first rear roller 31 and the second rear roller 32 in the rear roller group 30 rotate relatively with the movement of the slit paper. The first core shaft 60 is used to pass another packaging sheet, so that it is superimposed with the slit paper to form a packaging material. However, the first core shaft 60 and the other packaging sheet are not necessary, that is, the first core shaft 60 may not be provided. In other embodiments, the connection relationship between the front roller group 20 and the rear roller group 30 and the power device can be set according to actual needs.

[0037] In this embodiment, Figure 4-5 As shown, the mounting frame 40 is provided with a long hole 41, and the two ends of the mandrel of the second rear roller 32 are mounted in cooperation with the long holes 41 of the mounting frames 40 on both sides, so that the second rear roller 32 can be installed in a translational manner in the housing 10, and the second rear roller 32 can be translated toward or away from the first rear roller 31. The two ends of the mandrel of the first rear roller 31 are fixedly mounted on the mounting frame 40.

[0038] like Figure 2 , 6As shown in Fig. -9, a tension adjusting device 50 is provided in the middle of the rear roller group 30 to adjust the tension of the slit paper, so that the slit paper has different unfolding degrees. In other embodiments, the tension adjusting device 50 can be provided at both ends of the rear roller group 30. However, when the tension adjusting device 50 is provided at both ends of the rear roller group 30, the adjustment steps are cumbersome and the operation is inconvenient. In this embodiment, the tension adjusting device 50 is provided in the middle of the rear roller group 30 to adjust the tension of the slit paper, and the adjustment structure is simpler and the adjustment operation is more convenient.

[0039] The tension adjusting device 50 is used to apply a thrust to the middle of the second rear roller 32, so as to adjust the pressure of the relatively arranged first rear roller 31 and the second rear roller 32 in the rear roller group 30 on the slit paper, thereby adjusting the magnitude of the frictional force between the rear roller group 30 and the slit paper, and thus adjusting the magnitude of the tension on the slit paper by applying a thrust to the middle of the second rear roller 32. The adjustment structure is simpler and easier to implement, and the adjustment operation is more convenient.

[0040] The first rear roller 31 is located above the second rear roller 32, and the tension adjusting device 50 is arranged below the middle of the second rear roller 32. The tension adjusting device 50 acts on the middle of the second rear roller 32 to apply a thrust to the second rear roller 32, so as to adjust the pressure of the first rear roller 31 and the second rear roller 32 on the slit paper, thereby adjusting the magnitude of the tension on the slit paper. The tension adjusting device 50 is arranged below the middle of the second rear roller 32, making the structure layout more compact and the product volume smaller.

[0041] It is easy to understand that in other embodiments, the tension adjusting device 50 is arranged in the middle of the first rear roller 31. The tension adjusting device 50 acts on the middle of the first rear roller 31 to apply a thrust to the first rear roller 31, and can also achieve adjusting the pressure of the relatively arranged first rear roller 31 and the second rear roller 32 in the rear roller group 30 on the slit paper. In other embodiments, the tension adjusting device 50 can be an electric push rod or the like.

[0042] Such as Figure 6-9As shown in the figure, in this embodiment, the tension adjusting device 50 includes a tension adjusting knob 51, a mechanism adjusting limit bracket 52, a knob limiting member 53, an adjusting roller 54, a mechanism adjusting base 55, and a limit block 56. The tension adjusting knob 51 includes a knob body 512 and a screw rod section 511 that are connected to each other. The screw rod section 511 is provided with an external thread. The knob limiting member 53 is provided with an internally threaded hole that mates with it. The lower end of the mechanism adjusting limit bracket 52 is hinged to the mechanism adjusting base 55, and the upper end of the mechanism adjusting limit bracket 52 is rotatably connected to the adjusting roller 54, so that the adjusting roller 54 swings relative to the mechanism adjusting base 55 following the mechanism adjusting limit bracket 52. A long hole 521 is provided in the middle of the mechanism adjusting limit bracket 52. The screw rod section 511 of the tension adjusting knob 51 sequentially passes through the internally threaded hole of the knob limiting member 53 and the long hole 521 of the mechanism adjusting limit bracket 52, and a limit block 56 is fixedly connected to the end of the screw rod section 511.

[0043] In this embodiment, the knob limiting member 53 is composed of a nut 531 fixed to the rear side plate 13. In other embodiments, the knob limiting member 53 can be formed by directly providing a threaded hole on the rear side plate 13.

[0044] As Figure 2 , 6 As shown in FIGS. -9, the adjusting roller 54 abuts against the outer surface of the second rear roller 32, and the mechanism adjusting limit bracket 52 is inclined. When the tension adjusting knob 51 is tightened, the screw rod section 511 withdraws relative to the knob limiting member 53, driving the limit block 56 to move. The limit block 56 abuts against one side of the mechanism adjusting limit bracket 52, thereby pulling the mechanism adjusting limit bracket 52 to move from an inclined state to a vertical state, driving the adjusting roller 54 to generate a displacement. The adjusting roller 54 acts on the middle part of the second rear roller 32, thereby applying a thrust to the middle part of the second rear roller 32, increasing the pressure of the first rear roller 31 and the second rear roller 32 on the slit paper, increasing the frictional force of the first rear roller 31 and the second rear roller 32 on the slit paper, thereby adjusting the tension on the slit paper to increase, and enabling the slit paper to have a greater degree of unfolding. When it is necessary to adjust the tension on the slit paper to decrease, the tension adjusting knob 51 can be rotated in the reverse direction.

[0045] The tension adjusting device 50 of this embodiment has a simple structure, is easy to adjust and operate, and after adjustment, self-locking is achieved between the threaded fits of the adjusting device, so that the adjusting device is stable at the adjusted position, the tension on the slit paper is stable, the degree of unfolding of the finished slit paper is consistent, and the adjusting mechanism is stable and reliable.

[0046] The adjusting roller 54 can be formed by arranging a plurality of bearings on a fixed shaft, thereby reducing the friction between the adjusting roller 54 and the second rear roller 32, making it easier to adjust the tension adjusting device 50. The fixed shaft has threaded hole structures at both ends, which can be connected to the mechanism adjustment limit bracket 52 by using the threaded hole structures. Of course, the adjusting roller 54 can also be formed by arranging a bearing on a fixed shaft. In other embodiments, the adjusting roller 54 can also be formed by sleeves, rubber rollers, etc., which are sleeved on a core shaft.

[0047] Example 2

[0048] like Figure 10-12 As shown, the structure of the tension adjustment device 50' of this embodiment is different from that of the embodiment 1, and the rest is the same as that of the embodiment 1. In this embodiment, the tension adjustment device 50' comprises a tension adjustment knob 51, a mechanism adjustment limit bracket 52', a knob limiter 53, an adjustment roller 54, a mechanism adjustment base 55' and a limiter 56. The tension adjustment knob 51 comprises a knob body 512 and a screw segment 511 connected to each other. The screw segment 511 is provided with an external thread. The knob limiter 53 is provided with an internal threaded hole matched therewith.

[0049] The mechanism adjustment limit bracket 52' can be arranged on the mechanism adjustment base 55' in a translational sliding manner. Specifically, the mechanism adjustment limit bracket 52' is provided with a first sliding structure 523, and the mechanism adjustment base 55' is provided with a second sliding structure 551. The first sliding structure 523 and the second sliding structure 551 are a group of sliders and slide rails that can slide and cooperate with each other. In this embodiment, the mechanism adjustment limit bracket 52' is provided with protrusions 523 as sliders on both sides, and the mechanism adjustment base 55' is provided with slide grooves 523 as slide rails on both sides, so that the mechanism adjustment limit bracket 52' can be arranged on the mechanism adjustment base 55' in a translational sliding manner. The upper end of the mechanism adjustment limit bracket 52' is rotatably connected to the adjustment roller 54, so that the adjustment roller 54 follows the mechanism adjustment limit bracket 52' to translate and slide relative to the mechanism adjustment base 55'. A through hole 522 is set in the middle of the mechanism adjustment limit bracket 52', the screw section 511 of the tension adjustment knob 51 passes through the internal thread hole of the knob limit member 53 and the through hole 522 of the mechanism adjustment limit bracket 52' in sequence, and the limit block 56 is fixedly connected to the end of the screw section 511.

[0050] In this embodiment, the knob stopper 53 is composed of a nut 531 fixed to the rear side plate 13. In other embodiments, the knob stopper 53 can also be composed of a threaded hole directly provided on the rear side plate 13.

[0051] The adjusting roller 54 abuts against the outer surface of the second rear roller 32, and the adjusting roller 54 is biased to one side of the second rear roller 32. Figure 11As shown in the figure. When the tension adjustment knob 51 is rotated, the screw rod section 511 withdraws relative to the knob position limiter 53, driving the movement of the limit block 56. The limit block 56 abuts against one side of the mechanism adjustment limit bracket 52', thereby pulling the mechanism adjustment limit bracket 52' to move translationally, driving the adjustment roller 54 to produce translational movement. Since the adjustment roller 54 is offset to one side of the second rear roller 32, the adjustment roller 54 acts on the middle part of the second rear roller 32, applying a thrust to the middle part of the second rear roller 32, so that the pressure of the first rear roller 31 and the second rear roller 32 on the slit paper increases, and the frictional force of the first rear roller 31 and the second rear roller 32 on the slit paper increases, thereby adjusting the tension on the slit paper to increase, making the slit paper have a greater unfolding degree. When it is necessary to adjust the tension on the slit paper to decrease, the tension adjustment knob 51 can be rotated in the reverse direction.

[0052] The tension adjustment device 50' of this embodiment also has a simple structure, is easy to adjust and operate. After adjustment, self-locking is achieved between the screw thread fits of the adjustment device, making the adjustment device stable in the adjustment position, stabilizing the tension on the slit paper, making the unfolding degree of the finished slit paper consistent, and the adjustment mechanism is stable and reliable.

[0053] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present invention in terms of form and details without departing from the spirit and scope of the present invention defined by the appended claims, and all of them are within the protection scope of the present invention.

Claims

1. A paper feeder with a tension adjustment device, comprising a housing, a front roller group and a rear roller group, wherein the front roller group and the rear roller group are spaced apart from each other and extend approximately in parallel in the housing, the front roller group comprises a pair of front rollers arranged at a relative interval, and the rear roller group comprises a pair of rear rollers arranged at a relative interval, and an expandable slit sheet can be stretched and expanded by passing through the rear roller group and the front roller group in sequence, characterized in that: A tension adjusting device is arranged in the middle of the rear roller group, and the tension adjusting device is used to adjust the tension on the expandable slit sheet material so that the expandable slit sheet material has different expansion degrees.

2. The paper feeder according to claim 1, characterized in that: The tension adjustment device is used to apply a thrust to the middle of one of the paired rear rollers to adjust the pressure of the paired rear rollers on the slit paper, thereby adjusting the friction force of the rear roller group on the expandable slit sheet, thereby adjusting the tension on the expandable slit sheet.

3. The paper feeder according to claim 2, characterized in that: The tension adjusting device comprises an adjusting roller, the adjusting roller abuts against an outer surface of one of the paired rear rollers, and the tension adjusting device applies the thrust to the middle portion of one of the paired rear rollers through the adjusting roller.

4. The paper feeder according to claim 3, characterized in that: The adjustment roller is formed by arranging one or more bearings on a fixed shaft.

5. The paper feeder according to claim 3, characterized in that: The tension adjustment device also includes a tension adjustment knob, a mechanism adjustment limit bracket, a knob limit piece, a mechanism adjustment base and a limit block; the tension adjustment knob includes a knob body and a screw section that are connected to each other; the screw section is provided with an external thread; the knob limit piece is provided with an internal thread hole that cooperates with the external thread; the lower end of the mechanism adjustment limit bracket is hinged to the mechanism adjustment base, and the upper end of the mechanism adjustment limit bracket is rotatably connected to the adjustment roller, so that the adjustment roller can follow the mechanism adjustment limit bracket to swing relative to the mechanism adjustment base; a long hole is provided in the middle part of the mechanism adjustment limit bracket, and the screw section of the tension adjustment knob passes through the internal thread hole of the knob limit piece and the long hole of the mechanism adjustment limit bracket in turn, and is fixedly connected to the limit block at the end of the screw section, and the mechanism adjustment limit bracket is tilted.

6. The paper feeder according to claim 3, characterized in that: The tension adjustment device also includes a tension adjustment knob, a mechanism adjustment limit bracket, a knob limit piece, a mechanism adjustment base and a limit block; the tension adjustment knob includes a knob body and a screw segment connected to each other; the screw segment is provided with an external thread; the knob limit piece is provided with an internal thread hole matching the external thread; the mechanism adjustment limit bracket can be arranged on the mechanism adjustment base in a translationally slidable manner; the upper end of the mechanism adjustment limit bracket is rotatably connected to the adjustment roller, so that the adjustment roller can follow the mechanism adjustment limit bracket to translate and slide relative to the mechanism adjustment base, and the adjustment roller is offset to one side of one of the paired rear rollers; a through hole is provided in the middle part of the mechanism adjustment limit bracket, and the screw segment of the tension adjustment knob passes through the internal thread hole of the knob limit piece and the through hole of the mechanism adjustment limit bracket in sequence, and is fixedly connected to the limit block at the end of the screw segment.

7. The paper feeder according to claim 6, characterized in that: The mechanism adjustment limit bracket is provided with a first sliding structure, and the mechanism adjustment base is provided with a second sliding structure. The first sliding structure and the second sliding structure are a group of sliding blocks and sliding rails that can slide and cooperate with each other.

8. The paper feeder according to claim 7, characterized in that: The two sides of the mechanism adjustment limit bracket are provided with protrusions as the sliding blocks, and the two sides of the mechanism adjustment base are provided with sliding grooves as the sliding rails.

9. The paper feeder according to claim 1, characterized in that: The pair of rear rollers comprises a first rear roller and a second rear roller, the first rear roller is located above the second rear roller, and the tension adjustment device is arranged below the middle of the second rear roller.

10. The paper feeder according to claim 9, characterized in that: The second rear roller is translationally mounted in the housing so that the second rear roller can be translationally moved toward or away from the first rear roller.

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