Cutter assembly, paper cutting mechanism, paper cutting device and paper cutting method

Abstract

The invention relates to the technical field of paperboard cutting, and particularly discloses a cutter assembly, a paper cutting mechanism, a paper cutting device and a paper cutting method.The cutter assembly is provided with a first blade rotating in the circumferential direction around a first axis and a second blade rotating in the circumferential direction around a second axis, and after a paperboard enters a cutting area, the first blade and the second blade can synchronously and reversely rotate; the first cutting edge and the second cutting edge are used for carrying out scissor type cutting on paperboards; moreover, the distance between the first spiral section and the second spiral section when the paperboard enters the cutting area can be adjusted in advance, and as the spiral angles of the first spiral section and the second spiral section are equal, the first spiral section and the second spiral section are always kept at the same distance and do not make contact with each other in the cutting process, and compared with a conventional straight cutting structure, the cutting efficiency is improved. The two blades are free of contact and abrasion, the service life is long, the service life is as long as 5-10 years, the cutter does not need to be replaced frequently, and noise generated by impact of the cutter can be reduced by at least 15-20 decibels.

Description

Technical Field

[0001] The invention relates to the technical field of cardboard cutting, in particular to a cutter assembly, a paper cutting mechanism, a paper cutting device and a paper cutting method. Background Art

[0002] Corrugated cardboard is a multi-layer adhesive body, which consists of at least one layer of corrugated core paper and one layer of cardboard. Before the corrugated cardboard is made into a carton, it is usually cut into pieces. Fig.11 As shown, firstly, side grooves 51 are cut out on two side edges of the paperboard 50 , and then the edge position of the bottom is cut off to form a notch 52 .

[0003] Paper cutting is usually done by using a paper cutter. Figure 1 and Figure 2 As shown, the existing paper cutter uses a cutter 81, which is arranged on an upper wheel 82, and a lower wheel 83 is arranged below the upper wheel 82. When the paperboard 50 passes between the upper wheel 82 and the lower wheel 83, the cutter 81 is used to cut the side groove 51 on the paperboard 50. When the straight cutting method is adopted, the cutter 81 will contact with the lower wheel 83, wear quickly, and the cutter needs to be changed frequently. In addition, the cutting action of the cutter 81 hits the lower wheel 83, which will produce very loud noise.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a cutter assembly, a paper cutting mechanism, a paper cutting device and a paper cutting method to solve the above-mentioned problems.

[0006] Tool assembly, comprising:

[0007] A first blade, which rotates circumferentially around a first axis and has at least one first spiral cut surface and a first cutting edge formed at an edge of the first spiral cut surface;

[0008] A second blade, which rotates circumferentially about a second axis, has at least one second spiral cut surface and a second blade edge formed at an edge of the second spiral cut surface;

[0009] The first axis is not coaxial with the second axis;

[0010] The helical angles of the first helical section and the second helical section are equal;

[0011] The first blade and the second blade rotate with the first blade and the second blade to form a scissor-shaped cutting area that gradually overlaps along the axial direction;

[0012] When the paperboard enters the cutting area, the first spiral section and the second spiral section always maintain the same distance and do not contact each other.

[0013] Specifically, the first spiral section forms a first spiral angle around the first axis, and the first spiral angle is θ1;

[0014] The second spiral section forms a second spiral angle around the second axis, and the second spiral angle is θ2;

[0015] The following condition is satisfied: 0°<θ1=θ2≤30°.

[0016] Specifically, the first spiral section is an arc surface, so that the first blade forms a substantially V-shaped structure;

[0017] The second spiral section is an arc surface, so that the second blade forms a substantially V-shaped structure.

[0018] Specifically, the tool assembly further includes a first tool seat and a second tool seat, the first blade is fixed to the first blade seat, and the second blade is fixed to the second blade seat.

[0019] The paper cutting mechanism includes the knife assembly and further includes:

[0020] A first rotating shaft, used for driving the first blade to rotate circumferentially around the first axis;

[0021] A second rotating shaft, used for driving the second blade to rotate circumferentially around the second axis;

[0022] The first rotating shaft and the second rotating shaft rotate synchronously in opposite directions.

[0023] A paper cutting device, comprising at least one set of the paper cutting mechanisms, further comprising:

[0024] Bracket;

[0025] The driving mechanism is arranged on the bracket and is used for driving the first rotating shaft and the second rotating shaft to rotate synchronously in opposite directions.

[0026] Specifically, the driving mechanism includes a rotating driving device fixed to the bracket, a driving wheel drivingly connected to the output shaft of the rotating driving device, and a driven wheel meshing with the driving wheel; either the first rotating shaft or the second rotating shaft is drivingly connected to the driving wheel, and the other is drivingly connected to the driven wheel.

[0027] Specifically, the driving mechanism includes a first servo motor drivingly connected to the first rotating shaft and a second servo motor drivingly connected to the second rotating shaft.

[0028] Specifically, the paper cutting mechanism has two groups, and the two groups of paper cutting mechanisms are arranged in sequence along the feeding direction of the paperboard.

[0029] The paper cutting method uses the tool assembly and includes the following steps: the cardboard enters the cutting area, the first blade and the second blade rotate synchronously in opposite directions, and the first blade and the second blade are used to form a scissor-like cutting of the cardboard. During the cutting process, the first spiral cut surface and the second spiral cut surface always maintain the same distance and do not contact each other.

[0030] Beneficial effects of the present invention:

[0031] The tool assembly, paper cutting mechanism, paper cutting device and paper cutting method of the present invention are provided with a first blade rotating circumferentially around a first axis and a second blade rotating circumferentially around a second axis. When a paperboard enters a cutting area, the first blade and the second blade can rotate synchronously in opposite directions, and the first blade and the second blade are used to form a scissor-shaped cutting of the paperboard; and the spacing between the first spiral section and the second spiral section when the paperboard enters the cutting area can be adjusted in advance. Since the spiral angles of the first spiral section and the second spiral section are equal, the first spiral section and the second spiral section always maintain the same spacing and do not contact each other during the cutting process. Compared with a conventional straight cutting structure, the two blades have no contact, no wear, and a long service life. The practical service life is as high as 5 to 10 years, and there is no need to frequently change the blades. In addition, the noise generated by the impact of the cutter can be reduced by at least 15 to 20 decibels. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a cross-sectional schematic diagram of a paper cutter in the prior art;

[0033] Figure 2 for Figure 1 A magnified view of part A;

[0034] Figure 3 It is a structural schematic diagram of the paper cutting mechanism of Example 1 applied to a paper cutting machine;

[0035] Figure 4 The cross-section diagram of the paper cutting mechanism of Example 1 is shown in FIG. Figure 1 ;

[0036] Figure 5 The cross-section diagram of the paper cutting mechanism of Example 1 is shown in FIG. Figure 2 ;

[0037] Figure 6 The cross-section diagram of the paper cutting mechanism of Example 1 is shown in FIG. Figure 3 ;

[0038] Figure 7 is a three-dimensional diagram of the paper cutting device of Example 1;

[0039] Figure 8 The three-dimensional paper cutting mechanism of embodiment 1 Figure 1 ;

[0040] Fig. 9 The three-dimensional paper cutting mechanism of embodiment 1 Figure 2 ;

[0041] Fig.10 is a three-dimensional view of the tool assembly of Example 1;

[0042] Fig.11 It is a schematic diagram of the structure of the cardboard before and after cutting;

[0043] Fig.12 This is a three-dimensional diagram of the first blade and the first blade holder of Example 2.

[0044] The accompanying drawings are marked as follows: a first blade 10, a first axis 21, a first spiral section 11, a first cutting edge 12, a second blade 30, a second axis 41, a second spiral section 31, a second cutting edge 32, a cutting area 100, a cardboard 50, a first knife seat 13, a second knife seat 14, a first rotating shaft 20, a second rotating shaft 40, a bracket 60, a driving mechanism 70, a rotating driving device 71, a driving wheel 72, a driven wheel 73, a side groove 51, a notch 52, a cutter 81, a straight cutter 84, an upper wheel 82, a lower wheel 83, and a chassis 85. DETAILED DESCRIPTION

[0045] The present invention provides a cutter assembly, a paper cutting mechanism, a paper cutting device and a paper cutting method. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0046] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] Example 1

[0048] like Figures 1 to 11 This embodiment discloses a cutter assembly, a paper cutting mechanism, a paper cutting device and a paper cutting method, wherein the cutter assembly includes:

[0049] The first blade 10 rotates circumferentially around the first axis 21 and has at least one first spiral cut surface 11 and a first cutting edge 12 formed on the edge of the first spiral cut surface 11;

[0050] The second blade 30 rotates circumferentially around the second axis 41 and has at least one second helical cut surface 31 and a second cutting edge 32 formed on the edge of the second helical cut surface 31;

[0051] The first axis 21 is not coaxial with the second axis 41;

[0052] The spiral angles of the first spiral section 11 and the second spiral section 31 are equal;

[0053] The first blade 12 and the second blade 32 rotate with the first blade 10 and the second blade 30 to form a scissor-shaped cutting area 100 that overlaps progressively along the axial direction;

[0054] When the paperboard 50 enters the cutting area 100 , the first spiral section 11 and the second spiral section 31 always maintain the same distance and do not contact each other.

[0055] The tool assembly of this embodiment is provided with a first blade 10 that rotates circumferentially around a first axis 21 and a second blade 30 that rotates circumferentially around a second axis 41, and the first axis 21 and the second axis 41 are not coaxial, so that the first blade 10 and the second blade 30 can be separated and arranged in a mutually matching structure; when the cardboard 50 enters the cutting area 100, the first blade 10 and the second blade 30 can rotate synchronously in opposite directions, and the first blade 12 and the second blade 32 form a scissor-like cutting of the cardboard 50; and the first blade 12 and the second blade 32 can be pre-adjusted. When the good cardboard 50 enters the cutting area 100, the distance between the first spiral cut surface 11 and the second spiral cut surface 31 is large. Since the spiral angles of the first spiral cut surface 11 and the second spiral cut surface 31 are equal, the first spiral cut surface 11 and the second spiral cut surface 31 always maintain the same distance and do not contact each other during the cutting process. Compared with the conventional straight cutting structure, the two blades have no contact, no wear, long service life, and a practical service life of up to 5 to 10 years. There is no need to frequently change the blade, and the noise generated by the impact of the cutter can be reduced by at least 15 to 20 decibels.

[0056] On the other hand, the distance between the first spiral cut surface 11 and the second spiral cut surface 31 will affect the cutting effect of the cardboard 50. The distance between the first spiral cut surface 11 and the second spiral cut surface 31 is defined as the blade distance. If the blade distance is too small, the first blade 10 and the second blade 30 will contact and wear; if the blade distance is too large, the first blade 10 and the second blade 30 cannot form an effective cutting of the cardboard 50.

[0057] Of course, different thicknesses of cardboard 50 will also affect the cutting effect. This embodiment is explained by a specific example. When a cardboard 50 (corrugated paper) with a thickness of 5 mm is used for cutting test, if the knife distance is higher than 1.5 mm, the cardboard 50 may not be completely cut; if the knife distance is lower than 0.1 mm, due to the influence of vibration and runout, the first blade 10 and the second blade 30 may collide with each other at some positions.

[0058] Therefore, after the above test, it is concluded that: for the cutting of the cardboard 50 (corrugated paper) with a thickness of 5 mm, controlling the knife distance within 0.1 mm to 1.5 mm can meet the above cutting requirements.

[0059] Please refer to Fig. 9 The first spiral section 11 forms a first spiral angle around the first axis 21, and the first spiral angle is θ1. The spiral line corresponding to the first spiral section 11 can refer to the dotted line in the figure, and the spiral angle of the spiral line is the first spiral angle θ1.

[0060] The second spiral section 31 forms a second spiral angle around the second axis 41, and the second spiral angle is θ2. The spiral line corresponding to the second spiral section 31 is not shown in the figure. The spiral angle of the spiral line corresponding to the second blade 30 is the second spiral angle θ2.

[0061] The sizes of the first helical angle θ1 and the second helical angle θ2 are selected according to actual production requirements. However, in order to ensure that the first blade 10 and the second blade 30 do not collide with each other during peeling, as a preferred embodiment, the first helical angle θ1 and the second helical angle θ2 are set to be equal.

[0062] On the one hand, when the first spiral angle θ1 and the second spiral angle θ2 are both 0, it means that the first blade 10 and the second blade 30 are both straight cutters. At this time, the spacing between the first spiral cut surface 11 and the second spiral cut surface 31 is well controlled. Although the cardboard 50 can be cut, the first blade 10 and the second blade 30 are straight relative to the axis, and the side groove 51 that needs to be cut out of the cardboard 50 is also straight. Therefore, when two straight cutters are used, after the cardboard 50 is conveyed to the predetermined position, it is necessary to stop conveying and wait until the cutting is completed before re-conveying, which is inefficient.

[0063] On the other hand, when the first spiral angle θ1 and the second spiral angle θ2 are both not 0, the first blade 10 and the second blade 30 are both spiral cutters (similar to a bevel cutting structure). By using two spiral cutters, there is no need to stop the conveying of the cardboard 50 during the cutting process. The cardboard 50 can be cut by the two spiral cutters while being conveyed, and a straight side groove 51 can also be cut, which has high production efficiency.

[0064] Furthermore, the present embodiment also tests different first spiral angles θ1 and second spiral angles θ2. The test finds that when the first spiral angle θ1 and the second spiral angle θ2 satisfy the following conditions: 0°<θ1=θ2≤30°, the upper wheel 82 and the lower wheel 83 cooperate to control the conveying of the cardboard 50, so that efficient cutting can be achieved without stopping the conveying of the cardboard 50.

[0065] Please refer to Fig.10The tool assembly of this embodiment also includes a first tool seat 13 and a second tool seat 14. The first blade 10 is fixed to the first tool seat 13, and the first tool seat 13 and the first blade 10 are integrally formed. The second blade 30 is fixed to the second tool seat 14, and the second blade 30 and the second tool seat 14 are integrally formed. The one-piece structure has better stability.

[0066] This embodiment also discloses a paper cutting mechanism, which includes the above-mentioned tool assembly and further includes:

[0067] The first rotating shaft 20 is used to drive the first blade 10 to rotate circumferentially around the first axis 21;

[0068] The second rotating shaft 40 is used to drive the second blade 30 to rotate circumferentially around the second axis 41;

[0069] The first rotating shaft 20 and the second rotating shaft 40 rotate synchronously in opposite directions.

[0070] Furthermore, in this embodiment, a first mounting hole is set on the first tool seat 13, and the first tool seat 13 is fixed to the first preset groove of the first rotating shaft 20 by a first screw; a second mounting hole is set on the second tool seat 14, and the second tool seat 14 is fixed to the second preset groove of the second rotating shaft 40 by a second screw, so that the structural stability is better.

[0071] This embodiment also discloses a paper cutting device, comprising at least one set of paper cutting mechanisms, and further comprising:

[0072] Bracket 60;

[0073] The driving mechanism 70 is disposed on the bracket 60 and is used to drive the first rotating shaft 20 and the second rotating shaft 40 to rotate synchronously in opposite directions.

[0074] Furthermore, the driving mechanism 70 includes a rotating driving device 71 fixed to the bracket 60, a driving wheel 72 drivingly connected to the output shaft of the rotating driving device 71, and a driven wheel 73 meshing with the driving wheel 72; either the first rotating shaft 20 or the second rotating shaft 40 is drivingly connected to the driving wheel 72, and the other is drivingly connected to the driven wheel 73. The first rotating shaft 20 and the second rotating shaft 40 are controlled to rotate synchronously in opposite directions by a rotating driving device 71. The structure is ingenious and can also avoid the rotation speed error between the first rotating shaft 20 and the second rotating shaft 40.

[0075] Most common gear transmission structures use two gears meshing to achieve transmission. Since there is a virtual position between the teeth of the gears, the first blade 10 and the second blade 30 will collide with each other due to the virtual position of the gears. In order to solve this problem, the driving wheel 72 can adopt a structure composed of two gears combined along the axial direction (the two gears are not shown in the figure). The two gears are meshed with the driven wheel 73 at the same time to avoid the driving wheel 72 and the driven wheel 73 from hitting each other due to the virtual position between the teeth. In addition, as the years of use increase, it can also avoid shearing failure due to the increase in the distance between the first spiral section 11 and the second spiral section 31.

[0076] In other embodiments, the driving mechanism 70 can adopt another method. Specifically, the driving mechanism 70 includes a first servo motor connected to the first rotating shaft 20 and a second servo motor connected to the second rotating shaft 40. The servo motor can control the speed and the position accuracy is very accurate. In combination with the use of an encoder, the rotation angle control is very accurate.

[0077] The paper cutting mechanism of this embodiment has two groups, such as Figure 3 As shown, two sets of paper cutting mechanisms are sequentially arranged in the chassis 85 of the paper cutting machine along the feeding direction of the cardboard 50. Through such an arrangement, the side grooves 51 can be cut out of the two pieces of cardboard 50 at the same time, thereby improving efficiency. Then, in conjunction with the straight cutter 84, the upper wheel 82, and the lower wheel 83 in the chassis 85, the notch 52 is cut out of the bottom of the cardboard 50. Of course, in other embodiments, the number of paper cutting mechanisms can be set to one group or more than two groups, and the specific number and installation position are set according to product requirements.

[0078] In addition, the present embodiment also discloses a paper cutting method, which uses the above-mentioned tool assembly and includes the following steps: the cardboard 50 enters the cutting area 100, the first blade 10 and the second blade 30 rotate synchronously in opposite directions, and the first blade 12 and the second blade 32 are used to form a scissor-like cutting of the cardboard 50. During the cutting process, the first spiral cut surface 11 and the second spiral cut surface 31 always maintain the same distance and do not contact each other.

[0079] Since the first spiral cut surface 11 and the second spiral cut surface 31 always maintain the same distance and do not contact each other during the cutting process, compared with the conventional straight cutting structure, the two blades have no contact, no wear, long service life, and a practical life of up to 5 to 10 years. There is no need to frequently change the blades, and the noise generated by the impact of the cutter can be reduced by at least 15 to 20 decibels.

[0080] Example 2

[0081] Please refer to Fig.12In this embodiment, the first spiral section 11 is an arc surface, so that the first blade 12 forms a generally V-shaped structure; the second spiral section 31 is an arc surface, so that the second blade 32 forms a generally V-shaped structure. The first spiral section 11 and the second spiral section 31 are set as arc surfaces to form sharper first blade 12 and second blade 32.

[0082] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. Tool assembly, It is characterized in that include: A first blade (10) is circumferentially rotated around a first axis (21) and has at least one first spiral cut surface (11) and a first cutting edge (12) formed on an edge of the first spiral cut surface (11); A second blade (30) is circumferentially rotated around a second axis (41) and has at least one second helical section (31) and a second blade edge (32) formed on an edge of the second helical section (31); The first axis (21) and the second axis (41) are not coaxial; The spiral angles of the first spiral section (11) and the second spiral section (31) are equal; The first blade (12) and the second blade (32) rotate along with the first blade (10) and the second blade (30) to form a scissor-shaped cutting area (100) that gradually overlaps along the axial direction; When the paperboard (50) enters the cutting area (100), the first spiral section (11) and the second spiral section (31) always maintain the same distance and do not contact each other.

2. The tool assembly according to claim 1, Features: The first spiral section (11) forms a first spiral angle around the first axis (21), and the first spiral angle is θ 1 ; The second spiral section (31) forms a second spiral angle around the second axis (41), and the second spiral angle is θ 2 ; The following conditions are met: 0°<θ 1 =θ 2 ≤30°.

3. The tool assembly according to claim 1, Features: The first spiral section (11) is a curved surface, so that the first blade (12) forms a substantially V-shaped structure; The second spiral cut surface (31) is a curved surface, so that the second blade (32) forms a substantially V-shaped structure.

4. The tool assembly according to claim 1, Features: The tool assembly further comprises a first tool seat (13) and a second tool seat (14); the first blade (10) is fixed to the first blade seat (13), and the second blade (30) is fixed to the second blade seat (14).

5. Paper cutting mechanism, It is characterized in that The tool assembly according to any one of claims 1 to 4 further comprises: A first rotating shaft (20) for driving the first blade (10) to rotate circumferentially around the first axis (21); A second rotating shaft (40) is used to drive the second blade (30) to rotate circumferentially around the second axis (41); The first rotating shaft (20) and the second rotating shaft (40) rotate synchronously in opposite directions.

6. Paper cutting device, It is characterized in that The method comprises at least one set of the paper cutting mechanism as claimed in claim 5, further comprising: Bracket (60); The driving mechanism (70) is arranged on the bracket (60) and is used to drive the first rotating shaft (20) and the second rotating shaft (40) to rotate synchronously in opposite directions.

7. The tool assembly according to claim 6, Features: The driving mechanism (70) comprises a rotating driving device (71) fixed to the bracket (60), a driving wheel (72) drivingly connected to the output shaft of the rotating driving device (71), and a driven wheel (73) meshing with the driving wheel (72); either the first rotating shaft (20) or the second rotating shaft (40) is drivingly connected to the driving wheel (72), and the other is drivingly connected to the driven wheel (73).

8. The tool assembly according to claim 6, Features: The driving mechanism (70) comprises a first servo motor drivingly connected to the first rotating shaft (20) and a second servo motor drivingly connected to the second rotating shaft (40).

9. The tool assembly according to claim 6, Features: The paper cutting mechanism comprises two groups, and the two groups of the paper cutting mechanism are arranged in sequence along the feeding direction of the paperboard (50).

10. Paper cutting method, It is characterized in that The tool assembly according to any one of claims 1 to 4 is used, comprising the following steps: the cardboard (50) enters the cutting area (100), the first blade (10) and the second blade (30) rotate synchronously in opposite directions, and the first blade (12) and the second blade (32) are used to form a scissor-like cutting of the cardboard (50), and during the cutting process, the first spiral cut surface (11) and the second spiral cut surface (31) always maintain the same distance and do not contact each other.

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