A paper feeding mechanism of a label printer and a control method thereof

Abstract

The application discloses a paper feeding mechanism of a label printer, which comprises a first conveying roller, a second conveying roller and a third conveying roller which are sequentially arranged from a label paper roll to a note paper outlet, a press roller is arranged above the first conveying roller and the third conveying roller respectively, the note paper outlet is provided with a paper outlet position sensor, two adjusting rollers are arranged between the second conveying roller and the third conveying roller, the length of the adjusting rollers is less than half of the width of the label paper, the two adjusting rollers are respectively located on the two sides of the label paper, and the two adjusting rollers are not collinear, the adjusting rollers are installed on air cylinders, the adjusting rollers are connected with a driving motor, a middle air bag is arranged in the middle of the adjusting roller, side air bags are respectively arranged on the two sides of the middle air bag, and the outer sides of the middle air bag and the side air bags are covered with rubber surface layers. The application can improve the defects of the prior art, improve the reset accuracy and speed of the label paper, and reduce the scrap amount of the label paper.

Description

Technical Field

[0001] This invention relates to accessories for label printing machines, and more particularly to a paper feeding mechanism for a label printing machine and its control method. Background Technology

[0002] The paper feeding mechanism of a label printing machine is used to transport label sheets. Label sheets are prone to misalignment during transport. Existing paper feeding mechanisms correct this misalignment by adjusting the horizontal position of the conveyor rollers. However, this method is inaccurate and slow. If a label sheet misalignment occurs, multiple sheets will be wasted, and sometimes it may even require machine shutdown for reinstallation. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a paper feeding mechanism and its control method for a label printing machine, which overcomes the shortcomings of the prior art, improves the reset accuracy and speed of label paper, and reduces the amount of discarded label paper.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows.

[0005] A paper feeding mechanism for a label printing machine includes a first conveying roller, a second conveying roller, and a third conveying roller arranged sequentially from the label paper roll to the note paper outlet. Pressure rollers are respectively arranged above the first and third conveying rollers. A paper outlet position sensor is arranged at the note paper outlet. Two adjusting rollers are arranged between the second and third conveying rollers. The length of the adjusting rollers is less than half the width of the label paper. The two adjusting rollers are located on both sides of the label paper and are not collinear. The adjusting rollers are mounted on cylinders and connected to a drive motor. A central air bladder is arranged in the middle of the adjusting rollers, and side air bladders are arranged on both sides of the central air bladder. The outer sides of the central air bladder and the side air bladders are covered with a rubber surface layer.

[0006] Preferably, the adjusting roller is mounted on the cylinder via a buffer.

[0007] Preferably, the buffer includes a housing fixed to the cylinder, a first adjusting rod threadedly connected to the bottom of the housing, the top of the first adjusting rod located inside the housing, a first spring fixed to the top of the first adjusting rod, a buffer plate connected to the top of the first spring, a groove provided on the bottom surface of the buffer plate, the first spring being movably engaged in the groove, a support rod fixed to the top of the buffer plate, a conical buffer block fixed to the outside of the support rod, and several second adjusting rods arranged in a ring on the side wall of the housing, the second adjusting rods being threadedly connected to the housing, the tops of the second adjusting rods located inside the housing, a rubber ball head connected to the top of the second adjusting rods via a second spring, and the top of the support rods being connected to the adjusting roller via a bracket. When the support rod moves towards the bottom of the housing, the rubber ball head and the conical buffer block press against each other.

[0008] Preferably, the buffer plate has a cavity, and several spring pieces are fixed to the inner wall of the cavity. The free ends of the spring pieces are fixedly connected to the support rod, and a rubber gasket is provided between the support rod and the top surface of the cavity.

[0009] A control method for the paper feeding mechanism of the above-mentioned label printing machine includes the following steps: the paper output position sensor detects the position of the label paper in real time. When the label paper is found to be deviated, the cylinder and drive motor on the deviated side are activated. The cylinder pushes the adjusting roller to apply pressure to the label paper and reset the label paper. When the label paper is close to being reset, the cylinder (6) on the other side is activated to realize that the two adjusting rollers apply pressure to the label paper at the same time to avoid the label paper being over-reset. In the initial state, the linear speed of the adjusting roller is the same as the transmission speed of the label paper. When the label paper is tilted, the linear speed of the adjusting roller is changed, and the label paper is leveled by the sliding friction between the adjusting roller and the label paper.

[0010] Preferably, before the adjusting roller contacts the label paper, the middle airbag and side airbag on the corresponding adjusting roller are inflated. After the adjusting roller contacts the label paper, the middle airbag and side airbag are slowly deflated. If the offset of the label paper does not decrease after the adjusting roller contacts the label paper, the deflation process of the side airbag located on the outer side is stopped. After the offset of the label paper disappears, the side airbag located on the outer side is deflated. If the label paper reset speed is too fast, causing the reciprocating label paper to reset excessively, the deflation process of the side airbag located on the inner side is stopped. After the label paper has finished resetting, the side airbag located on the inner side is deflated.

[0011] The beneficial effects of adopting the above technical solution are as follows: the present invention achieves rapid leveling and resetting of label paper through a specially designed adjusting roller mechanism for leveling and resetting, with high resetting accuracy and speed, thereby reducing the amount of scrapped label paper. Attached Figure Description

[0012] Figure 1 This is a structural diagram of a specific embodiment of the present invention.

[0013] Figure 2 This is a structural diagram showing the installation position of the adjusting roller in a specific embodiment of the present invention.

[0014] Figure 3 This is a structural diagram of the adjusting roller in a specific embodiment of the present invention.

[0015] Figure 4 This is a structural diagram of a buffer in a specific embodiment of the present invention.

[0016] Figure 5 This is a structural diagram of a buffer plate in a specific embodiment of the present invention. Detailed Implementation

[0017] Reference Figure 1-5 One specific embodiment of the present invention includes a first conveying roller 1, a second conveying roller 2, and a third conveying roller 3 arranged sequentially from the label paper roll to the note paper outlet. A pressure roller 4 is respectively arranged above the first conveying roller 1 and the third conveying roller 3. A paper outlet position sensor 26 is arranged at the note paper outlet. Two adjusting rollers 5 are arranged between the second conveying roller 2 and the third conveying roller 3. The length of the adjusting roller 5 is less than half the width of the label paper. The two adjusting rollers 5 are located on both sides of the label paper and are not collinear. The adjusting rollers 5 are mounted on a cylinder 6 (the cylinder 6 is fixed on the frame, which is not shown in the frame diagram). The adjusting rollers 5 are connected to a drive motor 7. A middle airbag 8 is arranged in the middle of the adjusting roller 5. Side airbags 9 are arranged on both sides of the middle airbag 8. The outer sides of the middle airbag 8 and the side airbags 9 are covered with a rubber surface layer 10.

[0018] A control method for the paper feeding mechanism of the aforementioned label printing machine includes the following steps: the paper output position sensor 26 detects the position of the label paper in real time; when the label paper is found to be deviated, the cylinder 6 on the deviated side and the drive motor 7 are activated; the cylinder 6 pushes the adjusting roller 5 to apply pressure to the label paper and reset it; when the label paper is close to being reset, the cylinder 6 on the other side is activated, so that the two adjusting rollers 5 apply pressure to the label paper simultaneously, avoiding excessive reset of the label paper; in the initial state, the linear speed of the adjusting roller 5 is the same as the transmission speed of the label paper; when the label paper is tilted, the linear speed of the adjusting roller 5 is changed, and the sliding friction between the adjusting roller 5 and the label paper is used to level the label paper. Before the adjusting roller 5 contacts the label paper, the middle airbag 8 and the side airbag 9 on the corresponding adjusting roller 5 are inflated. After the adjusting roller 5 contacts the label paper, the middle airbag 8 and the side airbag 9 are slowly deflated. If the offset of the label paper does not decrease after the adjusting roller 5 contacts the label paper, the deflation process of the outer side airbag 9 is stopped. After the offset of the label paper disappears, the outer side airbag 9 is deflated. If the label paper reset speed is too fast, causing the reciprocating label paper to reset excessively, the deflation process of the inner side airbag 9 is stopped. After the label paper has finished resetting, the inner side airbag 9 is deflated.

[0019] This invention arranges two adjusting rollers 5 diagonally relative to the label paper and adds an airbag mechanism. When the label paper shifts, the two adjusting rollers 5 can push and reset the label paper separately, achieving rapid and precise leveling. Compared with the prior art, this invention effectively solves the shortcomings of existing reset devices by pushing the suspended part of the label paper from both sides. By controlling the deflation process of the middle airbag 8 and the side airbags 9, a lateral pushing force can be applied to the label paper, thereby enhancing the reset effect of the adjusting rollers 5. At the same time, since the adjusting rollers 5 are driven by cylinders 6, this is the most economical and durable method. However, cylinder drive inherently has the problems of low precision and large wobbling. By controlling the deflation of the middle airbag 8 and the side airbags 9, the wobbling caused by the cylinder action can be effectively buffered, improving the leveling accuracy and reducing the reciprocating fluctuations during the reset process. In addition, by controlling the rotation speed of the adjusting rollers 5, the tilting problem that may occur during the label paper transport can be leveled.

[0020] The adjusting roller 5 is mounted on the cylinder 6 via a buffer 11. The buffer 11 includes a housing 12 fixed to the cylinder 6. A first adjusting rod 13 is threadedly connected to the bottom of the housing 12. The top of the first adjusting rod 13 is located inside the housing 12. A first spring 14 is fixed to the top of the first adjusting rod 13. A buffer plate 15 is connected to the top of the first spring 14. A slot 16 is provided on the bottom surface of the buffer plate 15. The first spring 14 is movably engaged in the slot 16. A support rod 17 is fixed to the top of the buffer plate 15. A conical buffer block 18 is fixed to the outside of the support rod 17. Several second adjusting rods 19 are arranged in a ring on the side wall of the housing 12. The second adjusting rods 19 are threadedly connected to the housing 12. The top of the second adjusting rods 19 is located inside the housing 12. A rubber ball head 20 is connected to the top of the second adjusting rod 19 via a second spring 25. The top of the support rod 17 is connected to the adjusting roller 5 via a bracket 21. When the support rod 17 moves towards the bottom of the housing 12, the rubber ball head 20 and the conical buffer block 18 press against each other. The buffer 11 is used in conjunction with the airbag to further buffer the movement of the cylinder. The first adjusting rod 13 is used to adjust the longitudinal position of the conical buffer block 18, and in conjunction with the second adjusting rod 19 to adjust the horizontal position of the rubber ball head 20, it can be achieved that when the buffer 11 is activated, the conical buffer block 18 slides in contact with different rubber ball heads 20 at different moving distances with different frictional forces. Thus, the buffering action of the buffer 11 can be flexibly adjusted according to the working state and process requirements of the adjusting roller 5 to achieve the best buffering effect.

[0021] The buffer plate 15 has a cavity 22, and several spring pieces 23 are fixed to the inner wall of the cavity 22. The free ends of the spring pieces 23 are fixedly connected to the support rod 17, and a rubber gasket 24 is provided between the support rod 17 and the top surface of the cavity 22. The buffer plate 15 is designed as a hollow structure. By utilizing the elastic deformation of the horizontally placed spring pieces 23, the lateral impact force received by the buffer 11 can be buffered, thereby reducing the lateral displacement deformation of the first spring 14 due to lateral force and improving the linearity and stability of the buffer deformation of the first spring 14.

[0022] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A paper feeding mechanism for a label printing machine, comprising a first conveying roller (1), a second conveying roller (2), and a third conveying roller (3) arranged sequentially from the label roll to the note paper outlet, wherein pressure rollers (4) are respectively arranged above the first conveying roller (1) and the third conveying roller (3), and a paper outlet position sensor (26) is provided at the note paper outlet, characterized in that: Two adjusting rollers (5) are provided between the second conveying roller (2) and the third conveying roller (3). The length of the adjusting roller (5) is less than half the width of the label paper. The two adjusting rollers (5) are located on both sides of the label paper and are not collinear. The adjusting roller (5) is mounted on the cylinder (6) and connected to the drive motor (7). A middle airbag (8) is provided in the middle of the adjusting roller (5). Side airbags (9) are provided on both sides of the middle airbag (8). The outer sides of the middle airbag (8) and the side airbags (9) are covered with a rubber surface layer (10). The adjusting roller (5) is mounted on the cylinder (6) via a buffer (11); the buffer (11) includes a housing (12) fixed on the cylinder (6), a first adjusting rod (13) is threaded to the bottom of the housing (12), the top of the first adjusting rod (13) is located inside the housing (12), a first spring (14) is fixed to the top of the first adjusting rod (13), a buffer plate (15) is connected to the top of the first spring (14), a slot (16) is provided on the bottom surface of the buffer plate (15), the first spring (14) is movably engaged in the slot (16), and a support rod (17) is fixed to the top of the buffer plate (15). A conical buffer block (18) is fixed on the outside of the support rod (17). Several second adjustment rods (19) are arranged in a ring on the side wall of the outer shell (12). The second adjustment rods (19) are threadedly connected to the outer shell (12). The top of the second adjustment rod (19) is located inside the outer shell (12). The top of the second adjustment rod (19) is connected to a rubber ball head (20) through a second spring (25). The top of the support rod (17) is connected to the adjustment roller (5) through a bracket (21). When the support rod (17) moves towards the bottom of the outer shell (12), the rubber ball head (20) and the conical buffer block (18) press against each other.

2. The paper feeding mechanism of the label printing machine according to claim 1, characterized in that: The buffer plate (15) is provided with a cavity (22), and a number of spring pieces (23) are fixed on the inner side wall of the cavity (22). The free end of the spring piece (23) is fixedly connected to the support rod (17), and a rubber ring gasket (24) is provided between the support rod (17) and the top surface of the cavity (22).

3. A control method for the paper feeding mechanism of a label printing machine as described in claim 1, characterized in that... Includes the following steps: The paper output position sensor (26) detects the position of the label paper in real time. When the label paper is found to be deviated, the cylinder (6) on the deviated side and the drive motor (7) are activated. The cylinder (6) pushes the adjusting roller (5) to apply pressure to the label paper and reset the label paper. When the label paper is close to being reset, the cylinder (6) on the other side is activated so that the two adjusting rollers (5) apply pressure to the label paper at the same time to avoid the label paper being reset too much. In the initial state, the linear speed of the adjusting roller (5) is the same as the transmission speed of the label paper. When the label paper is tilted, the linear speed of the adjusting roller (5) is changed, and the sliding friction between the adjusting roller (5) and the label paper is used to level the label paper.

4. The control method for the paper feeding mechanism of the label printing machine according to claim 3, characterized in that: Before the adjusting roller (5) contacts the label paper, the middle airbag (8) and the side airbag (9) on the corresponding adjusting roller (5) are inflated. After the adjusting roller (5) contacts the label paper, the middle airbag (8) and the side airbag (9) are slowly deflated. If the offset of the label paper does not decrease after the adjusting roller (5) contacts the label paper, the deflation process of the side airbag (9) located on the outside is stopped. After the offset of the label paper disappears, the side airbag (9) located on the outside is deflated. If the label paper reset speed is too fast and the reciprocating label paper resets excessively, the deflation process of the side airbag (9) located on the inside is stopped. After the label paper is reset, the side airbag (9) located on the inside is deflated.

Images