Inner frame paper cutting device

Abstract

The application discloses an inner frame paper cutting device, which comprises a rack, a scoring part for scoring the inner frame paper, a first assembly, a second assembly and a transmission assembly connected between the first assembly and the second assembly, the first assembly comprising a first rotating shaft rotatably installed on the rack and a scoring roller fixedly connected with the first rotating shaft, at least two kinds of scoring knives being arranged on the outer circumferential surface of the scoring roller, the second assembly comprising a first rotating shaft rotatably installed on the rack and a counter pressure roller corresponding to the scoring roller and installed on the first rotating shaft, the counter pressure roller being used for cooperating with the scoring roller to score and convey the inner frame paper, and the transmission assembly being used for transmitting between the first rotating shaft and the second rotating shaft; wherein the second assembly is configured in such a manner that the counter pressure roller is rotatable along a first direction relative to the second rotating shaft and is not rotatable along a second direction opposite to the first direction, and the first direction is the rotating direction of the second rotating shaft when the scoring part scores the inner frame paper.

Description

Technical Field

[0001] This invention relates to the field of tobacco packaging machinery, and in particular to an inner frame paper cutting device. Background Technology

[0002] The mainstream packaging form for hard-pack cigarettes is the flip-top hard-pack. The flip-top hard-pack packaging process generally involves first wrapping the cigarettes in aluminum foil after they are grouped together, forming an inner package wrapped in aluminum foil. This inner package, simply called an aluminum foil cigarette pack, is then topped with an inner frame paper, and finally, the label paper is wrapped and sent to the downstream machine. A single sheet of inner frame paper is formed by folding, cutting, and then final trimming the inner frame paper strip pulled from the inner frame paper roll. Figure 1 The left side of the image shows an inner frame paper strip that has been cut with creases. The two crease lines in the middle are formed by alternating combinations of dotted cutting lines (X) and U-shaped cutting lines (Y), where the strip is bent during packaging. Different shaped cutting blades are installed on the crease roller for... Figure 1 The shape is achieved by setting dotted line cutters and U-shaped cutters on the scoring roller. As the scoring roller rotates, it simultaneously squeezes the counterweight roller, thus forming the inner frame paper strip between the scoring roller and the counterweight roller. Figure 1 The diagram shows an alternating combination of dotted line cuts and U-shaped cuts forming the scoring. During operation, the shafts of the scoring roller and the counterweight roller are poweredly connected, allowing them to simultaneously score the inner frame paper tape and output the inner frame paper tape. Because the shafts of the scoring roller and the counterweight roller are driven by gear meshing or other transmission methods, their rotational cycles are fixed. As operating time increases, the cutting marks on the counterweight roller become deeper, potentially affecting the scoring effect on the inner frame paper. Summary of the Invention

[0003] The purpose of this invention is to provide an inner frame paper cutting device that helps reduce the depth of cutting marks on the backing roller during operation.

[0004] This invention discloses an inner frame paper cutting device, comprising:

[0005] frame;

[0006] A scoring component for scoring inner frame paper includes a first component, a second component, and a transmission component powered between the first component and the second component. The first component includes a first rotating shaft rotatably mounted on the frame and a scoring roller fixedly connected to the first rotating shaft. The outer circumferential surface of the scoring roller is provided with at least two types of scoring blades. The second component includes a first rotating shaft rotatably mounted on the frame and a counterweight roller corresponding to the scoring roller mounted on the first rotating shaft. The counterweight roller is used to cooperate with the scoring roller to score and convey the inner frame paper. The transmission component drives the transmission between the first rotating shaft and the second rotating shaft.

[0007] The second component is configured such that the backing roller is rotatable relative to the second rotating shaft in a first direction but not rotatable in a second direction opposite to the first direction, wherein the first direction is the rotation direction of the second rotating shaft when the scoring component scores the inner frame paper.

[0008] In some embodiments, the backing roller includes a one-way bearing disposed on the second rotating shaft, and the working surface of the backing roller that mates with the scoring roller is the outer peripheral surface of the outer ring of the one-way bearing.

[0009] In some embodiments, the second component further includes a retaining ring and a bearing housing disposed between the second rotating shaft and the one-way bearing. The bearing housing includes a bearing mating surface that mates with the inner ring of the one-way bearing. The bearing housing also includes shoulders and a retaining ring located axially on both sides of the bearing mating surface and respectively abutting against both sides of the inner ring of the one-way bearing. The bearing housing is fixedly connected to the second rotating shaft. A keyway is provided on the inner surface of the inner ring of the one-way bearing, and a key that mates with the keyway is provided on the bearing mating surface.

[0010] In some embodiments, the outer diameter of the bearing mating surface is 0.4 mm larger than the inner diameter of the inner ring of the one-way bearing, and the outer diameter of the shoulder is 6 mm larger than the inner diameter of the inner ring of the one-way bearing.

[0011] In some embodiments, the device further includes a first bearing assembly connected to the first rotating shaft and a second bearing assembly connected to the second rotating shaft. The frame is provided with a first mounting hole group and a second mounting hole group. The first rotating shaft is rotatably mounted on the frame through the cooperation of the first bearing assembly with the first mounting hole group. The second rotating shaft is rotatably mounted on the frame through the cooperation of the second bearing assembly with the second mounting hole group. The inner frame paper cutting device further includes an elastic device disposed between the first mounting hole group and the first bearing assembly and / or between the second mounting hole group and the second bearing assembly. The inner frame paper cutting device is configured such that when the pressure between the scoring roller and the backing roller exceeds a first threshold, the first bearing assembly moves relative to the first mounting hole group against the elastic force of the elastic device to move the first rotating shaft away from the second rotating shaft and / or the second bearing assembly moves relative to the second mounting hole group against the elastic force of the elastic device to move the second rotating shaft away from the second rotating shaft.

[0012] In some embodiments, the first mounting hole assembly includes a bearing seat and a bearing pad. The bearing seat includes a rectangular hole and a first semi-circular hole located at one end of the rectangular hole and whose wall surface is tangent to the wall surface of the rectangular hole. One side of the bearing pad includes an arcuate groove, the arcuate groove and the first semi-circular hole having the same diameter. The first bearing assembly includes a bearing surrounded by the first semi-circular hole and the arcuate groove. The elastic device is disposed between the bearing pad and the bearing seat. The elastic force of the elastic device causes the arcuate groove to tend to move towards the first semi-circular hole. When the pressure between the scoring roller and the backing roller exceeds a first threshold, the bearing pad overcomes the elastic force of the elastic device and moves away from the first semi-circular hole.

[0013] In some embodiments, the bearing housing is a racetrack-shaped bearing housing, which includes the rectangular hole, the first semicircular hole, and the second semicircular hole located at the end of the rectangular hole away from the first semicircular hole and whose wall surface is tangent to the wall surface of the rectangular hole. The elastic device includes a spring disposed between the bearing pad and the racetrack-shaped bearing housing.

[0014] In some embodiments, the preload of the spring is adjustable.

[0015] Based on the inner frame paper cutting device provided by the present invention, by allowing the backing roller to rotate relative to the second rotating shaft in the direction of rotation when the second rotating shaft is working, but not in the opposite direction of rotation, when the inner frame paper cutting device cuts and marks the inner frame paper, the backing roller and the marking roller can normally mark and output the inner frame paper. At the same time, by rotating the backing roller relative to the second rotating shaft, the shape of the cutting mark on the marking roller at the same position of the backing roller is not fixed, thereby helping to avoid the formation of deep cutting marks on the backing roller.

[0016] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the inner frame paper in the prior art;

[0019] Figure 2 This is a schematic diagram of the inner frame paper cutting device according to an embodiment of the present invention;

[0020] Figure 3 for Figure 2 A magnified schematic diagram of a portion of the structure shown;

[0021] Figure 4 This is a schematic diagram of the structure of a counterweight roller according to another embodiment of the present invention;

[0022] Figure 5 for Figure 4 A schematic diagram of the bearing housing in the embodiment shown;

[0023] Figure 6 for Figure 4 A schematic diagram of the retaining ring in the embodiment shown;

[0024] Figure 7 This is a schematic diagram of the bearing seat hole according to another embodiment of the present invention;

[0025] Figure 8 for Figure 7 A schematic diagram of the bearing pad structure of the embodiment shown;

[0026] Figure 9 for Figure 7 A schematic diagram of the spring in the embodiment shown. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0029] In the description of this invention, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0032] The inner frame paper cutting device of this embodiment includes a frame 100 and a scoring component.

[0033] The scoring component is used to score the inner frame paper, for example, Figure 1 The diagram shows the creation of dashed cutting lines X and U-shaped cutting lines Y on the inner frame paper. The scoring component includes a first assembly, a second assembly, and a transmission assembly that connects the first and second assemblies. The first assembly includes a first rotating shaft 11 rotatably mounted on the frame 100 and a scoring roller 12 fixedly connected to the first rotating shaft 11. The outer circumferential surface of the scoring roller 12 is provided with at least two types of scoring blades, such as... Figure 2 and Figure 3 In the illustrated embodiment, the scoring roller 12 is equipped with a scoring knife 121 for marking dotted lines and a scoring knife 122 for marking U-shaped lines. The second component includes a first rotating shaft 11 rotatably mounted on the frame 100 and a counterweight roller 22 corresponding to the scoring roller 12 mounted on the first rotating shaft 11. The counterweight roller 22 cooperates with the scoring roller 12 to score and convey the inner frame paper. A transmission component drives the transmission between the first rotating shaft 11 and the second rotating shaft 21. Each scoring roller 12 has a corresponding counterweight roller 22 that works in conjunction with it during operation, such as... Figure 2 The illustrated embodiment has two scoring rollers 12 and two corresponding counterweight rollers 22. When the first shaft rotates, the transmission assembly transmits the rotation of the first shaft to the second shaft, causing the second shaft to rotate simultaneously. Figure 2 In the illustrated embodiment, the transmission assembly includes meshing gears.

[0034] The second component is configured such that the counterweight roller 22 is rotatable relative to the second rotating shaft 21 in a first direction but not rotatable in a second direction opposite to the first direction. The first direction is the rotation direction of the second rotating shaft 21 when the scoring component scores the inner frame paper. That is, during operation, the first rotating shaft drives the scoring roller 12 to rotate, scoring and rotating the inner frame paper roll located between the scoring roller 12 and the counterweight roller 22. The second rotating shaft rotates along with the second rotating shaft under the transmission component, causing the counterweight roller 22 located on it to rotate in the same rotation direction, facilitating the output of the inner frame paper roll. Because the counterweight roller 22 is rotatable relative to the second rotating shaft in the first direction, meaning it can rotate faster than the second rotating shaft during operation, a slight relative slippage occurs between the counterweight roller 22 and the inner frame paper. This causes the cutting marks formed by the scoring blade on the scoring roller 22 on the counterweight roller to be not fixed in the circumferential position of the counterweight roller, avoiding the effect of repeatedly deepening the cutting marks with the same shaped scoring blade when the circumferential position is fixed. The counterweight roller 22 and the second rotating shaft can be connected by a mechanism such as an overrunning clutch or a ratchet, thereby realizing the above-mentioned relative motion relationship between the counterweight roller 22 and the second rotating shaft.

[0035] In this embodiment of the inner frame paper cutting device, the backing roller 22 can rotate relative to the second rotating shaft 21 in the direction of rotation when the second rotating shaft 21 is working, but cannot rotate relative to each other in the opposite direction of rotation. Thus, when the inner frame paper cutting device cuts and marks the inner frame paper, the backing roller 22 and the marking roller 12 can normally mark and output the inner frame paper. At the same time, by rotating the backing roller 22 relative to the second rotating shaft 21, the shape of the cutting mark of the marking roller 12 at the same position of the backing roller 22 is not fixed, which helps to avoid the formation of deep cutting marks on the backing roller 22.

[0036] In some embodiments, such as Figure 4 As shown, the counterweight roller 22 includes a one-way bearing 3 mounted on the second rotating shaft 21. The working surface where the counterweight roller 22 mates with the scoring roller 12 is the outer circumferential surface of the outer ring of the one-way bearing 3. In the embodiment shown, the one-way bearing 3 includes an outer ring 32 and an inner ring 31. The outer circumferential surface of the outer ring 32 is the working surface where the counterweight roller 22 mates with the scoring roller 12. By directly using the one-way bearing 3 as the counterweight roller, the structure can be simplified, and it also helps to improve the hardness of the working surface where the counterweight roller 22 mates with the scoring roller 12.

[0037] In some embodiments, such as Figure 5 and Figure 6As shown, the second component also includes a retaining ring 5 and a bearing housing located between the second rotating shaft 21 and the one-way bearing 3. The bearing housing includes a bearing mating surface 41 that mates with the inner ring of the one-way bearing 3. The bearing housing also includes shaft shoulders 42 located axially on both sides of the bearing mating surface 41 and respectively abutting against both sides of the inner ring of the one-way bearing 3, and a retaining ring 5. The retaining ring 5 is installed in a retaining ring groove 43 on the bearing housing. The bearing housing can be fixedly connected to the second rotating shaft 21 by means of screws or other methods. A keyway is provided on the inner surface of the inner ring of the one-way bearing 3, and a key is provided on the bearing mating surface 41 that mates with the keyway. Through the engagement of the key and the keyway, the bearing housing can transmit the rotation of the second rotating shaft to the one-way bearing 3.

[0038] In some embodiments, the outer diameter of the bearing mating surface 41 is 0.4 mm larger than the inner diameter of the inner ring of the one-way bearing 3, and the outer diameter of the shoulder is 6 mm larger than the inner diameter of the inner ring of the one-way bearing. This allows the bearing mating surface 41 and the inner ring of the one-way bearing 3 to form an interference fit, and the shoulder to reliably position the one-way bearing 3 axially.

[0039] In some embodiments, the inner frame paper cutting device further includes a first bearing assembly connected to the first rotating shaft 11 and a second bearing assembly connected to the second rotating shaft 21. The frame 100 is provided with a first mounting hole group and a second mounting hole group. The first rotating shaft 11 is rotatably mounted on the frame 100 through the cooperation of the first bearing assembly and the first mounting hole group. The second rotating shaft 21 is rotatably mounted on the frame 100 through the cooperation of the second bearing assembly and the second mounting hole group. In the embodiment shown in the figure, both ends of the first rotating shaft 11 are respectively mounted into the two mounting holes of the first mounting hole group of the frame 100 through the two bearings of the first bearing assembly. Both ends of the second rotating shaft 21 are respectively mounted into the two mounting holes of the second mounting hole group of the frame 100 through the two bearings of the second bearing assembly. The two bearings may include ball bearings, needle bearings, etc. The inner frame paper cutting device also includes an elastic device disposed between the first mounting hole group and the first bearing assembly and / or between the second mounting hole group and the second bearing assembly. The inner frame paper cutting device is configured such that: when the pressure between the scoring roller 12 and the backing roller 22 exceeds a first threshold, the first bearing assembly overcomes the elastic force of the elastic device and moves relative to the first mounting hole group to move the first rotating shaft 11 away from the second rotating shaft 21, and / or the second bearing assembly overcomes the elastic force of the elastic device and moves relative to the second mounting hole group to move the second rotating shaft 21 away from the second rotating shaft 21. That is, in this embodiment, the shape of the mounting hole is not perfectly matched with the outer ring of the bearing. The bearing of the first rotating shaft or the bearing of the second rotating shaft can move in their respective mounting holes after overcoming the elastic force of the spring device. When the elastic force of the spring device cannot be overcome, the spring device makes the bearing of the first rotating shaft or the bearing of the second rotating shaft stably contact their respective mounting holes, and the first rotating shaft or the second rotating shaft stably maintains its working position and rotates, so that the scoring assembly can normally score the inner frame paper. When the pressure between the scoring roller 12 and the backing roller 22 exceeds the first threshold, for example, when the inner frame paper is blocked and causes overload, the first and second rotating shafts transmit the pressure to their respective bearings. The corresponding bearings will overcome the elastic force of the elastic device to make the first and second rotating shafts move away from each other, thereby separating the scoring roller and the backing roller, stopping the scoring of the inner frame paper, and forming overload protection.

[0040] In some embodiments, such as Figure 7 and Figure 8As shown, the first mounting hole assembly includes a bearing seat and a bearing pad 7. The bearing seat includes a rectangular hole and a first semi-circular hole 61 located at one end of the rectangular hole, with its wall tangent to the wall of the rectangular hole. In the embodiment shown, the semi-circular wall of the first semi-circular hole is tangent to the planar wall 63 of the rectangular hole. One side of the bearing pad 7 includes an arcuate groove 71, and the arcuate groove 71 and the first semi-circular hole 61 have the same diameter. The first bearing assembly includes a bearing surrounded by the first semi-circular hole 61 and the arcuate groove 71. An elastic device is disposed between the bearing pad 7 and the bearing seat. The elastic force of the elastic device causes the arcuate groove 71 to tend to move towards the first semi-circular hole 61. That is, during normal operation, the elastic force of the elastic device presses the bearing of the first bearing assembly 71 between the arcuate groove 71 and the first semi-circular hole 61, so that the first rotating shaft is kept in the working position and operates stably. When the pressure between the scoring roller 12 and the backing roller 22 exceeds the first threshold, the bearing pad 7 overcomes the elastic force of the elastic device and moves away from the first semi-circular hole 61, thereby causing the first rotating shaft and the second rotating shaft to move away from each other.

[0041] In some embodiments, such as Figure 7 As shown, the bearing housing is part of the frame. The bearing housing is a racetrack-shaped bearing housing, which includes a rectangular hole, a first semi-circular hole 61, and a second semi-circular hole 62 located at the end of the rectangular hole away from the first semi-circular hole 61 and whose wall surface is tangent to the wall surface of the rectangular hole. The elastic device includes a spring 8 disposed between the bearing pad 7 and the racetrack-shaped bearing housing. The spring 8 is disposed in the spring mounting hole 64. The bearing housing is also provided with a locking hole 65. The spring 8 can be locked by inserting a locking element such as a screw into the locking hole 65.

[0042] In some embodiments, the preload of spring 8 is adjustable.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. An inner frame paper cutting apparatus characterized by, The invention relates to a frame, a scoring device for scoring inner frame paper, comprising a first component, a second component and a transmission assembly connected between the first component and the second component, the first component comprising a first rotating shaft rotatably mounted on the frame and a scoring roller fixedly connected with the first rotating shaft, the scoring roller being provided with at least two types of scoring knives on the outer circumferential surface thereof, the second component comprising a second rotating shaft rotatably mounted on the frame and a counter-pressure roller mounted on the second rotating shaft and corresponding to the scoring roller, the counter-pressure roller being used to cooperate with the scoring roller to score and convey the inner frame paper, and the transmission assembly being used to transmit power between the first rotating shaft and the second rotating shaft. The second component is configured such that the counter-pressure roller is rotatable relative to the second rotating shaft in a first direction and is not rotatable relative to the second rotating shaft in a second direction opposite to the first direction, the first direction being the rotating direction of the second rotating shaft when the scoring device scores the inner frame paper, the inner frame paper cutting device further comprises a first bearing assembly connected with the first rotating shaft and a second bearing assembly connected with the second rotating shaft, the frame is provided with a first mounting hole group and a second mounting hole group, the first rotating shaft is rotatably mounted on the frame through cooperation of the first bearing assembly and the first mounting hole group, the second rotating shaft is rotatably mounted on the frame through cooperation of the second bearing assembly and the second mounting hole group, the inner frame paper cutting device further comprises an elastic device provided between the first mounting hole group and the first bearing assembly and / or provided between the second mounting hole group and the second bearing assembly, and the inner frame paper cutting device is configured such that, when the pressure between the scoring roller and the counter-pressure roller exceeds a first threshold value, the first bearing assembly moves relative to the first mounting hole group to move the first rotating shaft away from the second rotating shaft and / or the second bearing assembly moves relative to the second mounting hole group to move the second rotating shaft away from the first rotating shaft against the elastic force of the elastic device, and the transmission assembly comprises gears meshing with each other. The counter-pressure roller comprises a one-way bearing provided on the second rotating shaft, and the working surface of the counter-pressure roller for cooperating with the scoring roller is the outer circumferential surface of the outer ring of the one-way bearing. The second component further comprises a snap ring, a bearing seat provided between the second rotating shaft and the one-way bearing, the bearing seat comprising a bearing matching surface matched with the inner ring of the one-way bearing, the bearing seat further comprising an axial shoulder and a snap ring located on both sides of the bearing matching surface and respectively abutting against both sides of the inner ring of the one-way bearing, the bearing seat being fixedly connected with the second rotating shaft, the inner surface of the inner ring of the one-way bearing being provided with a key groove, and the bearing matching surface being provided with a key matched with the key groove.

2. The inner frame paper cutting apparatus of claim 1, wherein, The outer diameter of the bearing matching surface is 0.4 mm larger than the inner diameter of the inner ring of the one-way bearing, and the outer diameter of the axial shoulder is 6 mm larger than the inner diameter of the inner ring of the one-way bearing.

3. The inner frame paper cutting apparatus of claim 2, wherein, ​ 4. The inner frame paper cutting apparatus of claim 3, wherein ​ 5. The inner frame paper cutting apparatus of claim 1, wherein The first set of mounting holes comprises a bearing seat and a bearing pad, the bearing seat comprises a rectangular hole and a first semicircular hole located at one end of the rectangular hole and having a wall tangent to the wall of the rectangular hole, one side of the bearing pad comprises an arc-shaped slot, the diameter of the arc-shaped slot is the same as that of the first semicircular hole, the first bearing assembly comprises a bearing surrounded by the first semicircular hole and the arc-shaped slot, the elastic device is arranged between the bearing pad and the bearing seat, the elastic force of the elastic device makes the arc-shaped slot have a tendency to move in the direction close to the first semicircular hole, when the pressure between the score roller and the counter pressure roller exceeds a first threshold value, the bearing pad moves in the direction away from the first semicircular hole against the elastic force of the elastic device.

6. The inner frame paper cutting apparatus of claim 5, wherein, The bearing seat is a racetrack-shaped bearing seat, the racetrack-shaped bearing seat comprises the rectangular hole, the first semicircular hole and a second semicircular hole located at the end of the rectangular hole away from the first semicircular hole and having a wall tangent to the wall of the rectangular hole, the elastic device comprises a spring arranged between the bearing pad and the racetrack-shaped bearing seat.

7. The inner frame paper cutting apparatus of claim 6, wherein The pre-tightening force of the spring is adjustable.

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