Tissue printing device with adjustable transmission gap

Abstract

The utility model discloses a tissue printing device with an adjustable transmission gap, and belongs to the technical field of tissue printing processes. The roller comprises a first roller body and a second roller body which are matched with each other, one roller body is connected with a main gear through a connecting shaft, and the other roller body is connected with an auxiliary gear meshed with the main gear through a connecting shaft. The auxiliary gear comprises a first gear and a second gear which are coaxially arranged, teeth on the first gear and teeth on the second gear are staggered to form a total tooth, and the total tooth is clamped into a corresponding tooth groove in the main gear; the first roller body and the second roller body are both provided with pressing parts, and when the auxiliary gears are meshed with each other, the pressing parts on the two roller bodies correspond to each other. According to the utility model, gapless meshing between the main gear and the auxiliary gear can be realized, so that the contact stability between the corresponding pressing parts on the two roller bodies is ensured, and the adverse effect on the printing effect is eliminated.

Description

Technical Field

[0001] The utility model belongs to the technical field of paper towel printing technology, and more specifically relates to a paper towel printing device with adjustable transmission gap. Background Art

[0002] Paper towels are a necessity in people's daily life. Paper towels are usually made of two or more layers. Embossed composite paper products are widely favored by consumers because of their good water absorption and fluffiness.

[0003] At present, there are two commonly used embossing methods in the embossing process of paper towels: the first is the "point-to-face" printing method, that is, an embossing roller and a smooth roller are used for embossing, and a pattern can be embossed on one side of the paper towel; the second is the "point-to-point" printing method, that is, two embossing rollers with concave and convex overlapping composite embossing patterns are used for embossing.

[0004] For example, CN211138322U proposes a high-low pattern glue-free composite device for household paper, which combines a first base paper with a pattern and a second base paper between the roller surfaces of a second pressing roller and an embossing roller, and presses the two base papers together through the cooperation of the second pressing roller surface and the high-pressure pattern boss of the embossing roller.

[0005] CN108481986A proposes a double-layer point-to-point glue-free composite embossing system and composite embossed paper. In this application, the embossed first base paper and the second base paper meet at the tangent point between the upper embossing roller and the smooth roller to cooperate and compress and composite, so that the first concave point corresponds to the second concave point one by one, and the corresponding bottom end of the first concave point is tightly combined with the bottom end of the second concave point.

[0006] Regardless of the printing method, in order to ensure the synchronization of the rotation of a group of rollers that cooperate with each other, the rollers are usually driven by the meshing of the driving gear and the passive gear. Due to the machining accuracy and normal wear of the workpiece, a certain gap will be generated between the driving gear and the passive gear. The existence of this gap will cause the gear to shake during the transmission process, making the contact surface between the two rollers unstable, thus affecting the printing effect. Utility Model Content

[0007] 1. Problems to be solved

[0008] In view of at least some of the problems existing in the above prior art, the present invention proposes a tissue printing device with adjustable transmission gap, which aims to solve the problem that in the existing printing transmission system, a gap is easily generated between the active gear and the passive gear, thereby affecting the final printing effect.

[0009] 2. Technical solution

[0010] In order to solve the above problems, the technical solution adopted by the utility model is as follows:

[0011] The utility model discloses a tissue printing device with adjustable transmission gap, comprising a first roller body and a second roller body which cooperate with each other, wherein one roller body is connected to a main gear through a connecting shaft, and the other roller body is connected to a secondary gear which meshes with the main gear through a connecting shaft;

[0012] Among them, at least one of the main gear and the auxiliary gear can be rotated and adjusted relative to the roller body connected to each other, so that when the two gears are meshed with each other, a pair of pressing parts located at the pressing position on the two roller bodies correspond to each other.

[0013] Furthermore, the auxiliary gear comprises a first gear and a second gear which are coaxially arranged, and the teeth on the first gear and the second gear correspond to each other to form a total tooth;

[0014] The second gear can be rotatably adjusted relative to the first gear so that the main teeth are meshed with the corresponding tooth grooves on the main gear without gap.

[0015] Furthermore, the second gear can be rotatably sleeved on the annular boss on the side of the first gear, and the two are locked by a fastener.

[0016] Furthermore, fastening holes for fasteners to pass through are provided on the disk surfaces of the first gear and the second gear, and at least one fastening hole on the disk surface is a waist-shaped groove.

[0017] Furthermore, a plurality of the fastening holes are arranged along the central ring of each disc surface, wherein the fastening holes located on the second gear disc surface are waist-shaped holes.

[0018] Furthermore, the first gear is connected to the connecting shaft via a tension sleeve, so that the first gear can rotate infinitely relative to the circumference of the connecting shaft.

[0019] Furthermore, the width of the first gear is greater than the width of the second gear.

[0020] Furthermore, the top pressing surfaces of a pair of pressing portions located at the pressing position on the two roller bodies at least partially overlap.

[0021] Furthermore, a pair of pressing parts located at the pressing position on the two roller bodies have a gap between the pressing surfaces at the top thereof of 0.02-0.25 mm.

[0022] Furthermore, the ratio of the widths of the top pressing surfaces of a pair of pressing portions located at the pressing position on the two roller bodies is 1:(1-2).

[0023] Furthermore, the width of the pressing surface of the top surface of a single pressing portion is 0.5-1.5 mm.

[0024] Furthermore, the height of a single pressing portion is 0.2-2.0 mm.

[0025] Furthermore, the lamination portions on the same roller body have the same lamination surface width at the top.

[0026] Furthermore, the same roller body has two types of pressing parts with different pressing surface widths, and the two types of pressing parts are distributed at intervals along the circumference of the roller body.

[0027] Furthermore, the pressing portion is in the shape of a truncated cone.

[0028] Furthermore, the first roller body is connected to a driving source.

[0029] 3. Beneficial effects

[0030] Compared with the prior art, the beneficial effects of the utility model are:

[0031] (1) The utility model is a paper towel printing device with adjustable transmission gap. By optimizing the specific structure of the transmission mechanism, the transmission gap between the main gear and the auxiliary gear can be eliminated on the basis of ensuring the synchronization of the rotation of the two rollers, thereby ensuring the contact stability between the corresponding pressing parts on the two rollers, so as to eliminate the adverse effects on the printing effect.

[0032] (2) The utility model discloses a tissue printing device with adjustable transmission gap. Compared with the traditional keyway matching, it is necessary to set keyways at different positions to simultaneously meet the assembly requirements of one-to-one correspondence of the pressing parts and gapless meshing. In the utility model, the first gear and the connecting shaft are connected by a tension sleeve, which can realize the stepless rotation adjustment of the first gear, thereby making the installation and debugging operations of the entire transmission mechanism more convenient and quick.

[0033] (3) The utility model provides a tissue printing device with adjustable transmission gap. Through the cooperation between the large and small pressing parts, a certain error tolerance space is provided between the two pressing parts. In the process of eliminating the tooth gap, as long as the tooth gap does not exceed the error tolerance space, there is no need to recalibrate the pressing part. This greatly simplifies the operation process of eliminating the tooth gap and does not affect the overall printing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of a tissue printing device with adjustable transmission gap according to the utility model;

[0035] Figure 2 It is a structural schematic diagram of the transmission mechanism in the utility model;

[0036] Figure 3 It is a schematic diagram of the state of gapless meshing of the transmission mechanism in the utility model;

[0037] Figure 4 It is a structural schematic diagram of the first gear in the utility model;

[0038] Figure 5 This is a schematic diagram of the assembly between the first gear and the second gear in the utility model;

[0039] Figure 6 This is a schematic diagram of the cooperation when the top widths of the pressing parts on the two rollers are the same in the utility model;

[0040] Figure 7 It is a schematic diagram of the cooperation when the top surface widths of the pressing parts on the two rollers of the utility model are different.

[0041] In the figure: 1, first roller body; 2, second roller body;

[0042] 3. Transmission mechanism; 31. Main gear; 32. Sub gear; 321. First gear; 3211. First fastening hole; 322. Second gear; 3221. Second fastening hole; 33. Annular boss;

[0043] 4. Driving source. DETAILED DESCRIPTION

[0044] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings.

[0045] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0046] The utility model is further described below in conjunction with specific embodiments.

[0047] Example 1

[0048] like Figure 1As shown, a tissue printing device with adjustable transmission gap in this embodiment includes a first roller body 1 and a second roller body 2 rotatably arranged on a frame; wherein, the first roller body 1 and the second roller body 2 are both provided with a pressing portion (not shown in the figure), and the pressing portions on the two roller bodies have at least partial areas corresponding to each other at the pressing position.

[0049] The first roller body 1 and the second roller body 2 are connected via a transmission mechanism 3 to achieve synchronous and reverse rotation of the two roller bodies.

[0050] The frame is provided with a driving source 4, which is used to drive one of the rollers to rotate, and then drive the other roller to rotate through the transmission mechanism 3.

[0051] refer to Figure 2 , Figure 3 As shown, the transmission mechanism 3 includes a main gear 31 and a sub gear 32 that mesh with each other. The main gear 31 is connected to a roller body through a connecting shaft; the sub gear 32 is connected to another gear through a connecting shaft. At least one of the main gear 31 and the sub gear 32 can be rotated and adjusted relative to the corresponding roller body, so that when the two gears mesh with each other, a pair of pressing parts located at the pressing position on the two roller bodies correspond to each other.

[0052] When a transmission gap occurs between the main gear 31 and the auxiliary gear 32, by rotating one of the gears so that the teeth of the gear are close to one side of the tooth groove on the other gear, the transmission gap in the rotation direction can be eliminated.

[0053] It should be noted that the main gear and the secondary gear here are only used to distinguish the two gears, and it does not mean that the main gear must be the driving gear.

[0054] Specifically in this embodiment, the main gear 31 is connected to the first roller body 1 , the sub-gear 32 is connected to the second roller body 2 , and the sub-gear 32 can be rotated and adjusted relative to the second roller body 2 .

[0055] Meanwhile, the driving source 4 is preferably a motor, which is connected to the first roller body 1 via a connecting shaft.

[0056] Furthermore, the secondary gear 32 is composed of a first gear 321 and a second gear 322 which are coaxially arranged. The teeth on the first gear 321 and the second gear 322 correspond to each other to form a total tooth, and the second gear 322 can be rotated and adjusted relative to the first gear 321, so that the total tooth and the corresponding tooth groove on the main gear 31 can be meshed without gap.

[0057] Of course, there are many ways to realize the rotation adjustment between the first gear 321 and the second gear 322. Figure 4 As shown, an annular boss 33 is provided on one side of the first gear 321 , and the second gear 322 is rotatably sleeved on the annular boss 33 .

[0058] refer to Figure 5 As shown, a plurality of first fastening holes 3211 are arranged annularly with the center of the circle as the center on the toothed disk of the first gear 321; a plurality of second fastening holes 3221 corresponding to the first fastening holes 3211 are arranged annularly with the center of the circle as the center on the toothed disk of the second gear 322.

[0059] Among them, at least one of the first fastening hole 3211 and the second fastening hole 3221 is a waist-shaped hole to facilitate the misalignment adjustment between the two gears.

[0060] Specifically in this embodiment, the second fastening hole 3221 is a waist-shaped hole, and five first fastening holes 3211 and five second fastening holes 3221 are provided.

[0061] Meanwhile, the first gear 321 and the second gear 322 are connected by a fastener (not shown in the figure). Preferably, the fastener is a bolt and a nut that cooperate with each other.

[0062] In this embodiment, the transmission paths between the components of the transmission mechanism 3 are the main gear 31, the first gear 321, and the second gear 322. The main gear 31 and the first gear 321 are driven by meshing, and the first gear 321 and the second gear 322 are driven by the locking force of the fastener.

[0063] That is to say, during the entire transmission process, the teeth of the first gear 321 are stressed, while the teeth of the second gear 322 are substantially unstressed. Therefore, in this embodiment, the width of the first gear 321 is greater than the width of the second gear 322 to extend the service life of the first gear 321.

[0064] In this embodiment, a tissue printing device with adjustable transmission gap is provided, and the specific operation of adjusting the transmission gap is as follows:

[0065] First, loosen the fastener to release the locking relationship between the first gear 321 and the second gear 322; rotate the second gear 322 so that the teeth on the first gear 321 and the second gear 322 are staggered with each other until both sides of the formed total teeth are respectively in close contact with the two side walls of the corresponding tooth grooves on the main gear 31;

[0066] Next, the first gear 321 and the second gear 322 are locked by fasteners to achieve gapless meshing between the gears;

[0067] It should be noted that when the gears are meshed without clearance, it is necessary to ensure that the top pressing surfaces of a pair of pressing parts located at the pressing position overlap at least partially.

[0068] In the above operation, if the effect of at least partial overlap of the pressing part cannot be ensured while the gears are meshing without clearance, the pressing part calibration operation needs to be performed again. The specific operation is as follows:

[0069] At the same time, release the locking relationship between the first gear 321 and the connecting shaft, and between the first gear 321 and the second gear 322;

[0070] Then, the pressing parts on the two roller bodies are adjusted to corresponding states;

[0071] Next, the teeth on the first gear 321 and the second gear 322 are staggered so that the two sides of the formed total teeth are respectively in close contact with the two side walls of the corresponding tooth grooves on the main gear 31 to achieve gapless meshing;

[0072] Finally, the first gear 321 and the second gear 322 are locked, and the first gear 321 and the connecting shaft are locked.

[0073] The present embodiment is a tissue printing device with adjustable transmission gap. Through the optimized design of the specific structure of the transmission mechanism, on the basis of ensuring the synchronization of the rotation of the two rollers, it is also possible to achieve gapless meshing between the main gear 31 and the sub-gear 32, thereby ensuring the contact stability between the corresponding pressing parts on the two rollers, so as to eliminate the adverse effects on the printing effect.

[0074] Example 2

[0075] Traditionally, the gear and the connecting shaft are often connected by keyway. This is because the traditional structure usually adopts the form of smooth roller and smooth roller. When smooth roller and smooth roller are used, it is only necessary to consider the stable connection between the gear and the connecting shaft and the two gears meshing with each other.

[0076] In this embodiment, the convex points are matched with each other, that is, the pressing parts on the two roller bodies are matched with each other. This requires that after the gears and the connecting shaft are firmly connected, the mutual meshing between the gears and the corresponding positions of the pressing parts must be ensured. To this end, multiple keyways at different positions must be processed to meet the installation requirements, which increases the processing difficulty of the equipment; at the same time, the entire installation and adjustment operation becomes relatively cumbersome.

[0077] To this end, in this embodiment, the first gear 321 is connected to the connecting shaft by a tension sleeve, so that the first gear 321 can rotate infinitely relative to the circumference of the connecting shaft, thereby making the installation and debugging of the entire transmission mechanism more convenient and quick. Of course, the main gear 31 and the corresponding connecting shaft can also be connected by a tension sleeve.

[0078] Example 3

[0079] In the above embodiment, after the positional relationship of the corresponding pressing parts on the two rollers and the offset relationship between the first gear 321 and the second gear 322 are adjusted, the entire printing device is in a state of "pressing part against pressing part" and "no gear gap", which is also the best working state of the entire printing device.

[0080] However, as the working time goes by, some wear and tear will inevitably occur between the gears, resulting in the reappearance of tooth gaps, which in turn affects the printing effect. Although the transmission mechanism in the above embodiment can eliminate the tooth gaps again, it has strict requirements on the position between the pressing parts.

[0081] To this end, in the present embodiment of a tissue printing device with adjustable transmission gap, the ratio of the top surface widths of a group of corresponding pressing parts on the two rollers is 1:(1-2).

[0082] Specifically, the width of the top surface of the pressing portion on the first roller body 1 is L1, the width of the top surface of the pressing portion on the second roller body 2 is L2, and L1 is 1-2 times of L2.

[0083] in, Figure 6 It shows the matching schematic diagram of the two rollers at the pressing position when the top surface widths of the pressing parts on the two rollers are equal; Figure 7 The diagram shows the matching of the top surface widths of the pressing parts of the two rollers, one large and one small, at the pressing position of the two rollers.

[0084] It is worth noting that the width here refers to the distance occupied by the top surface of a single pressing portion along the circumferential direction of the roller body.

[0085] Furthermore, the L1 is preferably (1.1-1.5) L2. This is because if the ratio between L1 and L2 is too small, the fault tolerance effect between the large and small pressing parts is not obvious. A larger ratio will naturally improve the fault tolerance effect between the large and small pressing parts. However, this will cause the printed textures on the front and back of the paper to differ too much, resulting in a significant difference in the roughness of the two sides, thus affecting the user experience.

[0086] In order to ensure the effective pressing area and pressing force during pressing, the value range of L1 and L2 is 0.5-1.5mm, for example, 0.6mm, 0.8mm, 1.0mm, 1.2mm, etc. And the gap between the pressing surfaces of the top of a pair of pressing parts located at the pressing position on the two rollers is 0.02-0.25mm, for example, 0.04mm, 0.10mm, 0.18mm, etc.

[0087] At the same time, in order to ensure the clarity of the entire pattern after pressing, the height of a single pressing portion is 0.2-2.0 mm, such as 0.4 mm, 1.0 mm, 1.5 mm, etc.

[0088] Specifically in this embodiment, the pressing part is a truncated cone. At the same time, it is worth noting that although the large and small pressing parts are respectively arranged on different roller bodies in this embodiment, the large and small pressing parts can also be arranged alternately on the same roller body. The pressing part can also be replaced by other shapes, which are not listed here one by one.

[0089] In the present embodiment of a tissue printing device with adjustable transmission gap, the specific steps of eliminating the tooth gap are as follows:

[0090] Release the locking relationship between the first gear 321 and the second gear 322;

[0091] The teeth on the first gear 321 and the second gear 322 are staggered to appropriate positions, so that the two sides of the formed total teeth are respectively in close contact with the two side walls of the corresponding tooth grooves on the main gear 31;

[0092] At this time, since the locking relationship between the first gear 321 and the corresponding roller connecting shaft has not been released, the rotation of the first gear 321 will drive the roller and the pressing part thereon to rotate, thereby causing the pressing parts on the two rollers to be misaligned; but since the pressing surfaces of the pressing parts on the two rollers are arranged in a large and a small manner, there is a certain amount of misalignment space, which can still ensure that the pressing surface of the small pressing part completely falls on the pressing surface of the large pressing part, without affecting the overall pressing effect.

[0093] At the same time, it should be noted that when the adjustment gap distance between the gears exceeds the maximum tolerance space, the calibration operation of the pressing part needs to be re-performed.

[0094] In the present embodiment, a tissue printing device with adjustable transmission gap is provided, through the cooperation of a large and a small pressing part, so that in the adjustment process of eliminating the tooth gap, although the centers of the large and small pressing parts may be misaligned to a certain extent, as long as the pressing surface of the small pressing part can be fully or partially placed on the pressing surface of the large pressing part, the composite effect can be ensured.

[0095] That is, through the cooperation between the large and small pressing parts, a certain tolerance space is provided between the two pressing parts. In the adjustment process of eliminating the tooth gap, as long as the tooth gap does not exceed the above tolerance space, there is no need to recalibrate the pressing part. This greatly simplifies the operation process of eliminating the tooth gap and does not affect the overall printing effect.

[0096] In addition, a paper towel printing device with adjustable transmission gap in the present embodiment can be used for glue-free compounding between paper towels, and its working principle is: two paper towels with printed concave patterns enter between two roller bodies, and the pressing parts on each roller body are inserted into the printed concave patterns on the corresponding paper towels. Under the pressure of the pressing parts, the bottoms of the corresponding printed concave patterns on the two paper towels are intertwined with each other to achieve a tight combination between the two paper towels.

[0097] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A tissue printing device with adjustable transmission gap, comprising a first roller body (1) and a second roller body (2) that cooperate with each other, characterized in that: One of the roller bodies is connected to a main gear (31) via a connecting shaft, and the other roller body is connected to a secondary gear (32) meshing with the main gear (31) via a connecting shaft; At least one of the main gear (31) and the auxiliary gear (32) can be rotated and adjusted relative to the roller body to which it is connected, so that when the two gears are meshed with each other, a pair of pressing parts located at the pressing position on the two roller bodies correspond to each other.

2. A tissue printing device with adjustable transmission gap according to claim 1, characterized in that: The auxiliary gear (32) comprises a first gear (321) and a second gear (322) which are coaxially arranged, and the teeth on the first gear (321) and the second gear (322) correspond to each other to form a total tooth. The second gear (322) can be rotated and adjusted relative to the first gear (321) so that the main teeth are meshed with the corresponding tooth grooves on the main gear (31) without gap.

3. The paper towel printing device with adjustable transmission gap according to claim 2, characterized in that: The second gear (322) is rotatably sleeved on the annular boss (33) on the side of the first gear (321), and the two are locked by a fastener.

4. The paper towel printing device with adjustable transmission gap according to claim 3, characterized in that: The disk surfaces of the first gear (321) and the second gear (322) are both provided with fastening holes for fasteners to pass through, and at least one of the fastening holes on the disk surface is a waist-shaped groove.

5. The paper towel printing device with adjustable transmission gap according to claim 4, characterized in that: A plurality of the fastening holes are arranged along the center ring of each disk surface, wherein the fastening holes located on the disk surface of the second gear (322) are waist-shaped holes.

6. A tissue printing device with adjustable transmission gap according to any one of claims 2 to 5, characterized in that: The first gear (321) is connected to the connecting shaft via a tension sleeve, so that the first gear (321) can perform infinite rotation relative to the circumference of the connecting shaft.

7. The paper towel printing device with adjustable transmission gap according to claim 2, characterized in that: The width of the first gear (321) is greater than the width of the second gear (322).

8. A tissue printing device with adjustable transmission gap according to any one of claims 1 to 5, characterized in that: A pair of pressing parts located at the pressing position on the two roller bodies have pressing surfaces at the top thereof at least partially overlapped.

9. The paper towel printing device with adjustable transmission gap according to claim 8, characterized in that: A pair of pressing parts located at the pressing position on the two roller bodies have a gap between the top pressing surfaces of 0.02-0.25 mm.

10. The paper towel printing device with adjustable transmission gap according to claim 1, characterized in that: A pair of pressing parts located at the pressing position on the two roller bodies have a width ratio of the pressing surface at the top thereof of 1:(1-2).

11. A tissue printing device with adjustable transmission gap according to claim 10, characterized in that: The width of the pressing surface of the top surface of a single pressing portion is 0.5-1.5 mm.

12. The paper towel printing device with adjustable transmission gap according to claim 10, characterized in that: The height of a single pressing portion is 0.2-2.0 mm.

13. The paper towel printing device with adjustable transmission gap according to claim 10, characterized in that: The press-fitting parts on the same roller body have the same press-fitting surface width at the top.

14. The paper towel printing device with adjustable transmission gap according to claim 10, characterized in that: The same roller body is provided with two pressing parts with different pressing surface widths, and the two pressing parts are distributed at intervals along the circumference of the roller body.

15. A tissue printing device with adjustable transmission gap according to claim 13 or 14, characterized in that: The pressing part is in the shape of a truncated cone.

16. A tissue printing device with adjustable transmission gap according to any one of claims 1 to 5, characterized in that: The first roller body (1) is connected to a driving source (4).

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