Cigarette making machine paper feeding device and paper tension control method

Abstract

A paper feeding device and paper tension control method for a cigarette making machine. The paper feeding device includes a paper roll output mechanism, a paper pull roller, a paper feed roller, and multiple paper guide rollers. A tensioning mechanism for applying tension to the paper roll is provided along the paper tape conveying path between the paper pull roller and the paper feed roller. The tensioning mechanism includes a horizontally arranged tensioning roller for engaging the paper tape. The tensioning roller is connected to a guide rod for guiding its vertical movement and freely acts on the paper tape by gravity, maintaining a stable tension on the paper tape through the up and down movement of the tensioning roller. The tensioning roller acts on the paper roll by gravity and utilizes a vertically floating tension adjustment method, enabling rapid response to changes in the paper roll tension. The direction and magnitude of the force applied by the tensioning roller on the paper roll remain constant, providing constant tension to the paper roll. This eliminates the need for frequent adjustment of the paper pull roller speed, reduces impact on the paper roll, and improves the stability of paper roll conveyance.

Description

Technical Field

[0001] The present invention relates to cigarette making machine production equipment, in particular to a cigarette making machine paper feeding device and a paper tension control method. Background Art

[0002] The paper feeder of a cigarette making machine provides the tobacco wrapping paper (commonly known as coil paper) to the rolling mechanism. Before rolling, the coil paper typically undergoes printing and stamping. The tension of the coil paper varies depending on factors such as the coil material, machine speed, and mechanical transmission. Excessive or insufficient coil paper tension can easily lead to problems such as paper breakage and paper slippage, as well as offset stamping. Therefore, a tension control mechanism is required to maintain constant coil paper tension during transport.

[0003] To compensate for variations in paper tension, a tension roller is often used to apply tension to the paper. In existing tension control mechanisms, the tension roller is attached to a swing arm and relies on gravity or spring force to swing in response to changes in paper tension, maintaining paper tension on the paper. As the swing arm rotates, the amount of force it shares changes, and the force exerted by the tension roller on the paper also changes. Therefore, the tension applied by the tension roller on the paper is not constant and can only compensate for variations in paper tension to a certain extent. To maintain constant paper tension, the speed of the paper pull roller, which drives the paper, must be adjusted as quickly as possible as the swing arm rotates, allowing the tension to be adjusted in a timely manner to return the tension roller to its original position.

[0004] Frequent adjustment of the paper pulling roller speed in this way will have an impact on the paper during transportation, resulting in unstable transportation and easily causing defects such as paper pulling damage, wrinkles, and deviation. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defect of unstable conveying caused by the need to frequently adjust the rotation speed of the paper pulling roller, and to provide a paper feeding device for a cigarette making machine and a paper force control method.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a paper feeding device for a cigarette making machine, comprising a paper coil output mechanism for placing paper coils and leading out paper tape, a paper pulling roller and a paper feeding roller for providing power to the paper tape led out by the paper coil output mechanism, and a plurality of paper guide rollers arranged between the paper pulling roller and the paper feeding roller for changing the direction of the paper tape. The paper pulling roller and the paper feeding roller are respectively arranged on the front and rear sides of the processing mechanism for processing the paper tape in the paper tape conveying direction. A tensioning mechanism for providing tensioning force to the paper tape is provided on the paper tape conveying path between the paper pulling roller and the paper feeding roller. The tensioning mechanism includes a horizontally arranged tensioning roller for cooperating with the paper tape. The tensioning roller is connected to a guide rod for guiding its vertical movement, and acts freely on the paper tape by relying on gravity to maintain the stability of the tensioning force of the paper tape by the up and down floating of the tensioning roller.

[0007] On the paper tape conveying path, paper guide rollers are provided on both sides of the tensioning roller, and the horizontal distance between the paper guide rollers on both sides of the tensioning roller is equal to the diameter of the tensioning roller, so that the paper tape introduced into the tensioning roller and the paper tape led out from the tensioning roller are both transmitted in the vertical direction.

[0008] Both ends of the roller shaft of the tensioning roller are connected with guide rods, and the two guide rods are linked through a linkage mechanism so that the two ends of the tensioning roller are raised and lowered synchronously.

[0009] The linkage mechanism includes two gas containers, each of which is provided with a piston capable of moving up and down along its inner cavity, and the piston separates the gas container into an upper chamber and a lower chamber that are sealed and isolated from each other; the upper chamber of one gas container is connected to the lower chamber of the other gas container, and the lower chamber is connected to the upper chamber of the other gas container; the guide rods at both ends of the tensioning roller are respectively connected to the pistons in the two gas containers.

[0010] The guide rod penetrates into the gas container from the bottom and passes through the piston and then passes out from the top of the gas container; the upper and lower ends of the gas container are sealed with the guide rod and form a guide for the guide rod.

[0011] The guide rod is provided with a displacement detection mechanism for detecting the upward and downward movement amplitude of the tensioning roller.

[0012] The displacement detection mechanism is a proximity sensor corresponding to the upper and lower limit positions and the original position of the tensioning roller stroke respectively.

[0013] The paper pulling roller is driven by a servo motor and is connected to a rotation speed detection encoder.

[0014] The present invention also provides a paper tension control method. During the paper feeding process, the tension of the paper tape is maintained stable by using the compression effect of the tension roller on the paper tape under the action of gravity. During this process, the vertical movement amplitude of the tension roller is detected by a displacement detection mechanism. The rotation speed of the paper pulling roller is controlled according to the vertical movement amplitude of the tension roller. The specific method for controlling the rotation speed of the paper pulling roller is as follows:

[0015] (1) When the amplitude of the tension roller's up and down movement reaches the set limit, the paper pulling roller is controlled to increase or decrease its speed, so that the tension roller returns to its original position, and then the speed of the paper pulling roller is restored to the level before adjustment;

[0016] (2) When the tensioning roller reaches the set limit value in the same direction for more than a predetermined number of times, the paper tape linear velocity difference and the paper pulling roller speed difference are calculated based on the distance from the set limit position to the original position of the tensioning roller and the time when the tensioning roller reaches the set limit value, and the paper pulling roller speed is increased or decreased based on the paper pulling roller speed difference, and this speed is used as the initial speed for the next adjustment.

[0017] In step (2), the time for the tensioning roller to reach the set limit is the time taken from the first time the tensioning roller deviates from its original position after the last adjustment of the paper pulling roller speed to return the tensioning roller to its original position, to the time taken for the tensioning roller to move to the set limit.

[0018] The present invention provides the following advantages: the tension roller, acting on the paper roll by gravity and employing a vertically floating tension adjustment method, rapidly responds to changes in the paper roll's tightness. The direction and magnitude of the force exerted by the tension roller on the paper roll remain constant, providing a constant tension force. Therefore, the tension roller can be returned to its original position by adjusting the paper roll feed speed only after it reaches its travel limit. This eliminates the need for frequent adjustments to the paper pull roller's speed, reduces impact on the paper roll, and improves paper roll feed stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic diagram of an embodiment of the paper conveying path of the paper feeding device of the cigarette making machine of the present invention.

[0020] Figure 2 It is a schematic diagram of an embodiment of the linkage structure at both ends of the tensioning roller in the paper feeding device of the present invention.

[0021] Figure 3 It is a side view schematic diagram of the tensioning roller and its linkage mechanism in the paper feeding device of the present invention.

[0022] Markings in the figure: 1. Paper tape, 2. Paper pulling roller, 3. Paper feeding roller, 4. Paper guide roller, 5. Processing mechanism, 6. Tensioning mechanism, 601. Tensioning roller, 602. Guide rod, 7. Linkage mechanism, 701. Gas container, 702. Piston, 703. Upper chamber, 704. Lower chamber, 705. Air pipe, 8. Displacement detection mechanism, 9. Pressure roller. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings and specific embodiments. The specific contents listed in the following embodiments are not limited to the technical features required to solve the technical problems to be solved by the technical solutions described in the claims. At the same time, the examples listed are only part of the present invention, not all embodiments.

[0024] The paper feeding device of a cigarette making machine consists of a paper roll output mechanism, a paper pull roller, and a paper feed roller. The paper roll output mechanism is used to place the rolled paper and draw out a paper tape. The drawn paper tape is guided and then wound around the paper pull roller. The paper pull roller provides power to pull the paper tape out of the paper roll output mechanism. Figure 1The diagram shows a schematic diagram of one embodiment of the conveying path of the paper tape 1 from the paper output mechanism. The specific structure of the paper output mechanism is not shown in the figure; its structure can be referred to in the prior art. From the paper pull roller 2, the paper tape 1 changes direction via a series of paper guide rollers 4 and winds around to the paper feed roller 3, which provides the paper tape 1 with continued forward motion. The paper feed roller 3 conveys the paper tape 1 at a slightly greater linear speed than the paper pull roller 2. This can be achieved by adjusting the roller diameter or rotational speed to accommodate the stretching of the paper tape 1 and maintain tension between the paper feed roller 3 and the paper pull roller 2. The paper feed roller 3 typically rotates at a constant speed at a set speed to provide a stable paper supply to subsequent mechanisms. The paper pull roller 2 is driven by a servo motor and equipped with an encoder to detect its rotational speed. Adjusting the rotational speed of the paper pull roller 2 adjusts the tension of the paper tape 1 between the paper pull roller 2 and the paper feed roller 3.

[0025] like Figure 1 As shown, a processing mechanism 5 for processing the paper tape 1, such as printing text or stamping on the paper tape, is arranged along the paper tape conveying path between the paper pull roller 2 and the paper feed roller 3. The processing mechanism 5 may include an operating roller for printing or stamping, and a pressing roller for pressing the paper tape against the operating roller. The paper tape between the paper pull roller 2 and the paper feed roller 3 is kept taut, facilitating the printing or stamping operation.

[0026] like Figure 1 As shown, a tensioning mechanism 6 is also provided on the paper tape conveying path between the paper pulling roller 2 and the paper feeding roller 3, which is used to provide a preset tensioning force to the paper tape 1. On the one hand, it adjusts the tensioning force, and on the other hand, when the tension of the paper tape changes due to reasons such as the paper tape material or mechanical transmission, it quickly makes adaptive adjustments to keep the tensioning force constant. The size of the pre-tensioning force of the tensioning mechanism 6 can be achieved by changing its weight and other factors. The tensioning mechanism 6 shown in the figure includes a horizontally arranged tensioning roller 601. The axial length of the tensioning roller 601 is greater than the width of the paper tape. Its surface is in contact with the paper tape 1 to press the paper tape and provide tension to it. The tensioning roller (601) is connected to a guide rod 602, which plays a guiding role so that the tensioning roller 601 can only move vertically up and down. The tensioning roller 601 acts freely on the paper tape 1 due to gravity. When the paper tape between the paper pull roller 2 and the paper feed roller 3 is tightened, the tension roller 601 moves upward to loosen the paper tape. When the paper tape between the paper pull roller 2 and the paper feed roller 3 is loosened, the tension roller 601 moves downward to tighten the paper tape. The up and down movement of the tension roller 601 maintains a stable tension on the paper tape.

[0027] As shown in the figure, the paper strip 1 entering the tensioning roller 601 and exiting the tensioning roller are both transported vertically. The pulling force exerted by the paper strip on the tensioning roller 601 (i.e., the paper strip tension) is also vertical, and the combined force of these two pulling forces is always equal to the downward pressure (gravity) exerted by the tensioning roller 601 on the paper strip 1. As long as the weight of the tensioning roller 601 remains constant, the tension of the paper strip 1 remains constant. The direction of the paper strip 1 can be changed by installing paper guide rollers 4. For example, as shown in the figure, paper guide rollers 4 are installed on both sides of the tensioning roller 601. The horizontal distance between the two paper guide rollers 4 on the front and rear sides of the tensioning roller 601 is equal to the diameter of the tensioning roller 601 (the thickness of the paper strip is negligible). This ensures that the paper strip entering the tensioning roller and exiting the tensioning roller are both transported vertically.

[0028] In order to keep the tension roller 601 level, guide rods 602 can be provided at both ends of the roller shaft of the tension roller 601. The guide rods 602 can be directly connected to the roller shaft or can be connected to the roller shaft as shown in FIG. Figure 3 As shown, the guide rods 602 are indirectly connected to the roller shaft via a connector. The guide rods 602 on both sides are evenly matched with a guide mechanism, such as a sliding sleeve. This guide mechanism limits the deflection of the guide rods 602, thereby limiting the deflection of the tensioning roller 601. Furthermore, the two guide rods 602 can be connected by a linkage mechanism to synchronize their movement, allowing both ends of the tensioning roller 601 to rise and fall synchronously.

[0029] Figure 2The figure is a schematic diagram of an embodiment of the linkage mechanism 7. In this embodiment, the linkage mechanism 7 includes two gas containers 701, which are similar to cylinders. The gas containers 701 are fixed to the frame inside the cigarette making machine, arranged vertically, with their upper and lower ends sealed by end caps. Each gas container 701 is equipped with a piston 702 that can move up and down along its inner cavity. The piston 702 separates the gas container 701 into an upper chamber 703 and a lower chamber 704. The upper chamber 703 and the lower chamber 704 are sealed and isolated by the piston 702. The guide rods 602 at each end of the tensioning roller 601 extend through the lower end caps of the two gas containers and into their lower chambers. They are connected to the pistons 702, allowing the pistons to move up and down with the guide rods 602. The upper chamber 703 and lower chamber 704 of the two gas containers 701 are cross-connected by an air pipe 705. In the illustrated embodiment, the upper chamber of the left gas container is connected to the lower chamber of the right gas container, and the lower chamber of the left gas container is also connected to the upper chamber of the right gas container. When the piston in the left gas container moves downward, the gas in its lower chamber 704 is pressed into the upper chamber of the right gas container, increasing the pressure in the upper chamber of the right gas container. As the piston moves downward, the upper chamber of the left gas container draws air from the lower chamber of the right gas container, reducing the pressure in the lower chamber of the right gas container. As the pressure in the upper chamber of the right gas container increases and the pressure in the lower chamber decreases, the piston of the right gas container also moves downward accordingly. This allows the two ends of the tensioning roller 601 to move up and down synchronously. Compared to methods that rely on guide mechanisms such as sliding sleeves to limit the deflection of the guide rod 602, this structure is more reliable because the guide rod 602 does not bear lateral forces and will not get stuck.

[0030] As shown in the figure, guide rod 602, which penetrates the gas container from the bottom, passes through piston 702 and then continues upward through the end cap above gas container 701, so that guide rods 602 of equal diameter are inserted into both the upper chamber 703 and the lower chamber 704 of gas container 701. As piston 702 moves, the spatial changes in upper chamber 703 and lower chamber 704 are the same, maintaining a stable air pressure without changing the downward force applied by tension roller 601 via the piston and guide rod.

[0031] The upper and lower end caps of gas container 701 seal against guide rod 602, maintaining the upper chamber 703 and lower chamber 704 sealed while also providing vertical guidance for guide rod 602. In this embodiment, the pressure within gas container 701 can be set to atmospheric pressure. The internal and external pressures of gas container 701 are consistent, so high sealing requirements are not required. It is sufficient that gas preferentially flows from one gas container to the other during piston movement.

[0032] like Figure 3As shown, the guide rod 602 is provided with a displacement detection mechanism 8 for detecting the vertical movement of the tensioning roller. The displacement detection mechanism 8 can be a linear displacement sensor, or several proximity sensors can be placed on the side of the guide rod 602 at key points along its travel range. The proximity sensors detect the position of detection points on the guide rod 602, and by detecting the position and range of movement of the guide rod 602, the position and range of movement of the connected tensioning roller 601 are detected. As shown in the figure, a proximity sensor is provided at a detection point on the guide rod 602 corresponding to the original position of the tensioning roller 601 (i.e., the position of the tensioning roller 601 after the initial tension adjustment). Two proximity sensors are also provided at the upper and lower travel limits of the tensioning roller 601. The proximity sensors at the upper and lower travel limits define the range of movement of the tensioning roller 601, while the proximity sensor at the original position determines whether the tensioning roller 601 has returned to its original position.

[0033] The present invention utilizes the following method to control paper tension. First, during the paper feeding process, the constant pressure exerted by the tension roller 601 on the paper strip 1 under the influence of gravity maintains a stable tension on the paper strip. The tension roller 601 adjusts to any fluctuations in the tension of the paper strip 1 under normal circumstances. During this process, the displacement detection mechanism 8 detects the vertical movement of the tension roller 601. When the upper and lower limit proximity sensors detect a signal, it indicates that the vertical movement of the tension roller has reached the set limit, and the tension roller needs to be adjusted back to its original position. If the upper limit is reached, it indicates excessive tension on the paper strip 1. In this case, the speed of the paper roller 2 needs to be increased, for example, by 3 rpm, to loosen the paper strip between the paper roller 2 and the paper feed roller 3. If the lower limit is reached, it indicates excessive tension on the paper strip. In this case, the speed of the paper roller 2 needs to be reduced, for example, by 3 rpm, to further tension the paper strip between the paper roller 2 and the paper feed roller 3. After the tension roller returns to its original position, the speed of the paper roller can be restored to its original position.

[0034] During the above adjustment process, record the number of times the tension roller 601 continuously moves to the upper limit position n. 上 and the number of times n the continuous movement reaches the lower limit position 下 , when the upper limit position detects a signal, n 上 Add 1 and n 下 Assign a value of 0. When the signal is detected at the lower limit position, n 下 Add 1 and n 上 Assign a value of 0. n 上 and n 下 Set a preset value, for example, 3 times. When the tension roller reaches the set limit value in the same direction for more than the preset number of times, that is, n 上 or n 下When the value is greater than 3, the paper pull roller speed can be increased or decreased accordingly. This speed adjustment will not be reversed and will serve as the initial speed for the next adjustment. The speed adjustment range is determined by the tension roller's deflection speed. At the start of equipment operation or after the previous adjustment of the paper pull roller speed to return the tension roller to its original position, the time from the first deviation of the tension roller from its original position to the time the tension roller reaches the set limit position is recorded as the time t for the tension roller to reach the set limit. Preferably, time t is the average time taken for several consecutive movements to the limit. The distance from the set limit position to the original position of the tension roller is the set value L. The change in the length of the paper strip between the paper pull roller and the paper feed roller is twice the distance the tension roller moves, recorded as 2L. During this process, the difference in the linear velocity of the paper strip between the paper pull roller and the paper feed roller that causes the change in the length of the paper strip is 2L / t. The radius of the paper pull roller can be used to determine the proportional relationship between its linear velocity and speed. Based on the calculated linear velocity difference of 2L / t, the paper pull roller speed difference v can be calculated. The rotation speed v is the rotation speed that the paper pulling roller needs to increase or decrease.

[0035] The control method of the present invention allows the tension roller to adaptively adjust and maintain constant tension even when paper tension fluctuates. The pull roller's speed does not need to be adjusted, thus preventing impact on the paper roll caused by frequent speed increases and decreases. Only when the tension roller's movement reaches its limit, or when the paper roll stretches due to material problems, speed mismatch between the pull roller and the paper feed roller, or other mechanical transmission issues cause the paper tape to frequently sag or tighten, is the pull roller's speed adjusted according to the method described, returning the tension roller to its original position or aligning the pull roller's speed with the paper roll's feed, thereby maintaining stable, constant-tension paper roll feed.

[0036] The above description of the specific embodiments is only used to help understand the technical concept and core ideas of the present invention. Although specific preferred embodiments are used herein to describe and illustrate the technical solutions, they should not be understood as limiting the present invention itself. Those skilled in the art may make various changes in form and details without departing from the technical concept of the present invention. These easily conceived changes or substitutions should all be included within the scope of protection of the present invention.

Claims

1. A paper force control method for a paper feeding device of a cigarette making machine, the paper feeding device of the cigarette making machine comprising a paper roll output mechanism for placing a paper roll and leading out a paper tape (1), a paper pulling roller (2) and a paper feeding roller (3) for providing power to the paper tape led out of the paper roll output mechanism, and a plurality of paper guide rollers (4) arranged between the paper pulling roller and the paper feeding roller for changing the direction of the paper tape, wherein the paper pulling roller (2) and the paper feeding roller (3) are respectively arranged in front of and behind a processing mechanism (5) for processing the paper tape (1) in the paper tape conveying direction. On the side, a tensioning mechanism (6) for providing tensioning force to the paper tape (1) is provided on the paper tape conveying path between the paper pulling roller (2) and the paper feeding roller (3), the tensioning mechanism (6) comprising a horizontally arranged tensioning roller (601) for cooperating with the paper tape (1), the tensioning roller (601) being connected to a guide rod (602) for guiding its vertical movement, and acting freely on the paper tape (1) by gravity, so as to maintain the stability of the tensioning force of the paper tape by the up and down floating of the tensioning roller (601), characterized in that: During the paper feeding process, the tension of the paper tape (1) is maintained stable by the tensioning roller (601) pressing the paper tape under the action of gravity, and during this process, the vertical movement amplitude of the tensioning roller (601) is detected by the displacement detection mechanism (8); the rotation speed of the paper pulling roller (2) is controlled according to the vertical movement amplitude of the tensioning roller; the specific method of controlling the rotation speed of the paper pulling roller is as follows: (1) When the amplitude of the tension roller's up and down movement reaches the set limit, the paper pulling roller is controlled to increase or decrease its speed, so that the tension roller returns to its original position, and then the speed of the paper pulling roller is restored to the level before adjustment; (2) When the number of times the tension roller reaches the set limit in the same direction exceeds a predetermined value, the paper tape linear velocity difference and the paper pulling roller speed difference are calculated based on the distance from the set limit position to the original position of the tension roller and the time when the tension roller reaches the set limit, and the paper pulling roller speed difference is increased or decreased based on the paper pulling roller speed difference, and the speed is used as the initial speed for the next adjustment; the time when the tension roller reaches the set limit is the time from the first time the tension roller deviates from its original position after the previous adjustment of the paper pulling roller speed to return the tension roller to its original position, to the time when the tension roller moves to the set limit.

2. The paper tension control method of a paper feeding device of a cigarette making machine according to claim 1, characterized in that: On the paper tape conveying path, paper guide rollers (4) are provided on both the front and rear sides of the tensioning roller (601), and the horizontal distance between the paper guide rollers (4) on the front and rear sides of the tensioning roller (601) is equal to the diameter of the tensioning roller (601), so that the paper tape introduced into the tensioning roller and the paper tape led out from the tensioning roller are both transported in the vertical direction.

3. The paper tension control method of a paper feeding device of a cigarette making machine according to claim 1, characterized in that: Both ends of the roller shaft of the tensioning roller (601) are connected to guide rods (602), and the two guide rods (602) are linked via a linkage mechanism (7), so that both ends of the tensioning roller (601) rise and fall synchronously.

4. The paper tension control method of a paper feeding device of a cigarette making machine according to claim 3, characterized in that: The linkage mechanism (7) includes two gas containers (701), each gas container (701) is provided with a piston (702) capable of moving up and down along its inner cavity, and the piston (702) separates the gas container (701) into an upper chamber (703) and a lower chamber (704) that are sealed and isolated from each other; the upper chamber of one gas container is connected to the lower chamber of the other gas container, and the lower chamber is connected to the upper chamber of the other gas container; the guide rods (602) at both ends of the tensioning roller (601) are respectively connected to the pistons (702) in the two gas containers.

5. The paper tension control method of a paper feeding device of a cigarette making machine according to claim 4, characterized in that: The guide rod (602) penetrates into the gas container from the bottom of the gas container (701), passes through the piston (702), and then passes out from the top of the gas container (701); the upper and lower ends of the gas container (701) are sealed with the guide rod (602) and form a guide for the guide rod (602).

6. The paper tension control method of a paper feeding device of a cigarette making machine according to claim 1, characterized in that: The guide rod (602) is provided with a displacement detection mechanism (8) for detecting the upward and downward movement amplitude of the tensioning roller.

7. The paper tension control method of a paper feeding device of a cigarette making machine according to claim 6, characterized in that: The displacement detection mechanism (8) is a proximity sensor corresponding to the upper and lower limit positions and the original position of the tensioning roller (601) respectively.

8. The paper tension control method of a paper feeding device of a cigarette making machine according to claim 1, characterized in that: The paper pulling roller (2) is driven by a servo motor and is connected to a speed detection encoder.

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