Automatic control device and method for small tension during paper unrolling and rolling

Abstract

The present invention relates to a device and method for automatically controlling small tension during paper unrolling. The device is characterized by including structures such as an unrolling shaft, a friction wheel, a damping mechanism, a link mechanism, a flattening roller, a tension roller, a turning roller, a paper pressing wheel, etc. The swing roller of the link mechanism rises under the action of paper tension. Using a two-stage lever composed of a swing rod, a connecting rod, a hook rod, and two upper and lower fulcrums, it drives the damping mechanism to move, causing the damping belt to gradually loosen the friction wheel and increasing the paper unrolling speed. When the unrolling tension decreases, the swing roller descends under the gravity of the counterweight, and the link mechanism drives the damping mechanism to rise obliquely, causing the damping belt to gradually hold the friction wheel tightly, increasing the paper tension, thereby achieving stable paper unrolling tension. At the same time, the paper tension can be adjusted by adjusting the position of the counterweight, so as to keep the unrolling tension relatively constant. This technology solves the technical problems of appropriate and stable paper unrolling tension for post-printing collating paper.

Description

Technical Field

[0001] The present invention relates to a paper processing device, and particularly to a paper unrolling small-tension automatic control device and method. Background Art

[0002] For a roll-type paper processing device, the control of the paper tension generally uses a magnetic powder brake to generate resistance to tension the paper, and adjusts the current to adjust the braking force generated by the magnetic powder brake to control the paper tension. The heavier the paper roll, the larger the magnetic powder brake required. When a large constant tension is required during paper processing, a tension detection device is used to adjust the current input to the magnetic powder brake to achieve a constant paper tension. However, it is difficult to achieve appropriate and stable tension during postpress collating unrolling. The reason is that the tension required for collating is relatively small. For a pressure-sensing type tension detection device, the pressure is too small to be sensitive, and at the same time, the small braking force generated by the small current of the magnetic powder brake is not sufficient to overcome the inertia of the paper roll. Especially for a large magnetic powder brake to control small tension, it is particularly unstable, resulting in unstable paper unrolling tension, easily causing the phenomenon of scattered unrolling, waste, and low work efficiency.

[0003] It should be noted that in this specification, the term "hinged" is used as the connection method of parts. Hinging means that two parts are connected by a cylindrical pin. The cylindrical pin is fixed on one part, and the other part can rotate around the cylindrical pin. Summary of the Invention

[0004] The purpose of the present invention is to provide a paper unrolling small-tension automatic control device and method to solve the technical problems of appropriate and stable paper unrolling tension during postpress collating.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: A paper unrolling small-tension automatic control device includes a wallboard on the main device. A freely rotatable unrolling shaft is installed on the wallboard. The unrolling shaft is fixed with a paper roll in an air shaft manner and is cantilever-mounted. It is characterized in that a friction wheel is fixedly installed at the end of the unrolling shaft close to the wallboard. There is a set of floating damping mechanisms outside the friction wheel. The damping mechanisms are obliquely hinged and installed on a link mechanism, and there are two support pins installed on the wallboard below; the link mechanism is hinged and installed on the wallboard through an upper shaft pin and a lower shaft pin; on the wallboard, there are also three freely rotatable rollers installed on the left side of the link mechanism: a flattening roller on the upper side, a tension roller in the middle, and a turning roller on the lower side. A set of paper pressing wheels is also installed on the left side of the tension roller.

[0006] A further technical solution is that the damping mechanism includes a damping belt that surrounds at least half of the outer surface of the friction wheel and is fixed on a Y-shaped fork handle, and is hinged to the link mechanism through the sliding block of the Y-shaped fork handle, and the position can be adjusted by an adjusting screw.

[0007] Further technical solution: The link mechanism is composed of a swing rod, a connecting rod, and a hook rod through hinge combination, and together with the upper and lower two fulcrums, it forms a two-stage lever. By using the two-stage lever, the displacement distance is gradually reduced while the applied force is increased.

[0008] Further technical solution: By installing an adjustable counterweight on the left side of the swing rod to adjust the force to overcome the rise of the swing rod, that is, to adjust the tension of the paper, and connecting a spring installed on the wall panel to the right end of the swing rod to increase the auxiliary force.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: According to the above-mentioned automatic control device and method for small tension during paper unrolling, through the unwinding shaft installed on the wall panel, the friction wheel fixedly installed at the end of the unwinding shaft against the wall panel, the damping mechanism, the link mechanism, and the link mechanism are hinged and installed on the wall panel through the upper and lower pivot pins, the flattening roller, the tension roller, the turning roller, the paper pressing wheel and other structures. During operation, the roll paper is installed on the unwinding shaft, and the head of the paper is unrolled counterclockwise above, passing around the flattening roller, the swing roller, and the tension roller in sequence. After passing around the tension roller, the paper can be pressed by the paper pressing wheel, then pass around the turning roller, and the roll paper is driven to unwind passively by the paper unrolling tension of the main equipment. The paper tension drives the swing roller at the end of the swing rod to pull the end of the swing rod to rise. By using the two-stage lever composed of the swing rod, the connecting rod, the hook rod and the upper and lower two fulcrums, the damping mechanism is driven to move, so that the damping belt gradually loosens the friction wheel, reducing the unrolling resistance and increasing the paper unrolling speed; when the paper unrolling speed increases and the unrolling tension rapidly decreases under the inertia of the paper and is insufficient to overcome the gravity of the counterweight, the swing roller descends under the gravity of the counterweight, causing the link mechanism to drive the damping mechanism to rise obliquely, making the damping belt gradually tighten the friction wheel, and the unwinding shaft gradually reduces the rotation speed under the action of friction, so that the paper unrolling slows down and the paper tension increases; through this two-stage lever principle control method, a relatively large friction force can be obtained between the damping belt and the friction wheel with a relatively small paper unrolling tension, so as to achieve a stable paper unrolling tension; at the same time, the position of the counterweight can be adjusted to adjust the force to overcome the rise of the swing rod, and this force forms the tension of the paper. When the gravity of the counterweight is insufficient, the auxiliary force can be increased by the spring connected to the right end of the swing rod, so as to keep the unrolling tension relatively constant.

[0010] In summary, this automatic control device and method for small tension during paper unrolling solves the technical problems of appropriate and stable paper unrolling tension for postpress collating. Brief Description of the Drawings

[0011] Attached Figure 1 is the schematic diagram of the device principle of the present invention.

[0012] Attached Figure 2 is the schematic diagram of the device reaching the upper limit position during operation of the present invention.

[0013] Explanation of reference numerals in the drawings: 1 - wall panel; 2 - unwinding shaft; 3 - damping mechanism, 4 - linkage mechanism, 5 - flattening roller, 6 - tension roller, 7 - turning roller, 8 - paper pressing wheel, 9 - paper roll. Detailed implementation manners

[0014] To make the implementation purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in the form of embodiments with reference to the accompanying drawings.

[0015] As shown in FIG. 1, this automatic paper unwinding and small-tension control device in the embodiment includes a wall panel 1 on the main device. An unwindable and rotatable unwinding shaft 2 is cantilever-mounted on the wall panel 1. The unwinding shaft 2 is fixed with a paper roll in the air-expansion shaft manner. A friction wheel 21 is fixedly installed at the end of the unwinding shaft 2 against the wall panel 1. There is a set of floating damping mechanism 3 outside the friction wheel 21. The damping mechanism 3 is obliquely hinged to a set of linkage mechanism 4 and there are two support pins 11 installed on the wall panel below. The function of the support pins 11 is to limit the position where the damping mechanism 3 loosens and completely drops; the linkage mechanism 4 is hinged to the wall panel 1 through an upper pin 12 and a lower pin 13; on the wall panel 1, there are also three rotatable rollers installed on the left side of the linkage mechanism 4: the upper flattening roller 5, the middle tension roller 6, and the lower turning roller 7; on the left side of the tension roller 6, there is also a set of paper pressing wheels 8, and the paper pressing wheels 8 are also fixedly installed on the wall panel 1.

[0016] The damping mechanism 3 includes a damping belt 31 that surrounds at least half of the outer surface of the friction wheel 21. The damping belt 31 is wrapped with a reinforcing steel belt 32. The damping belt 31 and the reinforcing steel belt 32 are superimposed and fixed to a Y-shaped fork handle 33 with screws. There is a long hole in the middle of the Y-shaped fork handle 33. There is a sliding block 34 fixed to the linkage mechanism 4 in the long hole. The sliding block 34 is connected to an adjusting screw 35. The adjusting screw 35 is installed on the Y-shaped fork handle 33 by threads and locked with a lock nut 36.

[0017] The linkage mechanism 4 includes a swing rod 41. At the left end of the swing rod 41, a swing roller 42 is installed. In the middle in the vertical direction, a connecting rod 43 is hinged and installed. At the upper end of the connecting rod 43, a hook rod 44 is hinged and installed; at the right end of the swing rod 41, a spring 45 is connected. At the upper end of the spring 45, a mounting head 451 with a long hole is fixed. The mounting head 451 is installed on the wall panel 1 through mounting screws 452; on the left side of the swing rod 41, a weight 46 with an adjustable position is also installed. On the wall panel 1 above the right side of the swing rod 41, a limit pin 14 is fixed; in the middle of the swing rod 41, on the right side of the connecting rod 43, a hinged hole matching the lower pin 13 is opened. At the right end of the hook rod 44, there is a hook 441. On the hook 441, there is a hinged hole matching the upper pin 12. The sliding block 34 and the Y-shaped fork handle 33 in the damping mechanism 3 are installed on the hook 441 with pins, large washers, and split pins, so that the slider can rotate relative to the hook 441 and can slide within the Y-shaped fork handle 33.

[0018] The working principle of this linkage mechanism 4 is to utilize a two-stage lever mechanism to reduce the displacement distance and simultaneously increase the applied force. Specifically, the first-stage lever is the swing rod 41. Using the lower pin 13 as the fulcrum, through the rise or fall of the distal swing roller 42 (and the weight 46), it drives the proximal connecting rod 43 to reduce the displacement (while increasing the force) and drive the hook rod 44 to rise or fall; the second-stage lever is the hook rod 44. Using the upper pin 12 as the fulcrum, through the rise or fall of the distal connecting rod 43, it drives the proximal hook 441 to reduce the displacement (while increasing the force) and rotate to rise or fall. The hook 441 drives the damping mechanism 3 to control the tightness of the damping belt 31 around the friction wheel 21 through the displacement and the magnitude of the obtained force; the principle of this two-stage lever mechanism enables a larger frictional force to be obtained between the damping belt 31 and the friction wheel 21 with a smaller paper unrolling and rewinding tension, thereby achieving the purpose of controlling the small tension during paper unrolling and rewinding.

[0019] The method of using the automatic small-tension control device for paper unrolling and rewinding in the above embodiment is as follows:

[0020] Initial adjustment of the device: As Figure 1 shown, adjust the position of the weight 46 of the linkage mechanism 4 to make the swing roller 42 descend to the lowest position by gravity, that is, the swing rod 41 rotates around the lower pin 13 to the right and touches the limit pin 14; then adjust the relative position of the sliding block 34 and the Y-shaped fork handle 33 by adjusting the screw 35 and the lock nut 36 to make the damping belt 31 completely hold the friction wheel 21 tightly; adjust the tightness of the mounting screws 452 so that the mounting head 451 can slide freely.

[0021] Initial adjustment of paper unrolling: Install the roll paper 9 on the unrolling shaft 2 and fix it by air inflation method, so that the head of the paper is unrolled counterclockwise with the head facing upward. The paper bypasses the flattening roller 5, the swing roller 42, and the tension roller 6 in sequence. After bypassing the tension roller 6, press the paper with the paper pressing wheel 8, then bypass the turning roller 7, and then pass through other devices of the main equipment. The tension of the paper is formed by tightening the paper through the main equipment and transmitted to the unrolling section to form an unrolling tension to drive the roll paper 9 to unroll passively.

[0022] Since the main equipment for collating usually pulls the paper by means of conveying holes or pressing wheels, the generated tension is relatively small. When the roll paper 9 is unrolled, due to inertia, the unrolling speed will be relatively greater than the paper conveying speed, resulting in excessive unrolling of the paper and a decrease in tension. Due to the pressure of the paper pressing wheel 8, this tension reduction only occurs in the unrolling section from the unrolling shaft 2 to the tension roller 6 and does not affect the paper conveying tension in other parts of the main equipment. The tension in the unrolling section from the unrolling shaft 2 to the tension roller 6 is called the unrolling tension, and the paper conveying tension in other parts of the main equipment can be called the conveying tension. The conveying tension is transmitted to the unrolling section and becomes the unrolling tension.

[0023] Automatic adjustment of unrolling tension: Under the action of the unrolling tension, the paper overcomes the gravity of the counterweight 46 and pulls the swing roller 42 to rise, driving the swing rod 41 to rotate around the lower pivot pin 13. The swing rod 41 then drives the connecting rod 43 to rise, causing the hook rod 44 to rotate around the upper pivot pin 12, so that the hook 441 drives the damping mechanism 3 to move obliquely downward to the left. The damping belt 31 gradually loosens the friction wheel 21, so that the unrolling shaft 2 rotates under the traction of the paper unrolling tension to achieve the unrolling of the roll paper 9; the higher the swing roller 42 rises, the more the damping belt 31 loosens the friction wheel 21, and thus the faster the roll paper unrolls; when the swing roller 42 rises to the point where the damping belt 31 completely loosens the friction wheel 21, the unrolling speed of the paper increases, and the unrolling tension rapidly decreases under the inertia of the roll paper and is insufficient to overcome the gravity of the counterweight 46. The swing roller 42 descends under the gravity of the counterweight 46, and the linkage mechanism 4 drives the damping mechanism 3 to rise obliquely, causing the damping belt 31 to gradually tighten the friction wheel 21. The unrolling shaft 2 gradually reduces its rotation speed under the action of friction, so that the roll paper unrolls more slowly, and the paper restores the unrolling tension, thus maintaining the unrolling tension relatively constant. As shown in the Figure 2 figure.

[0024] In some cases, a relatively large conveying tension and uncoiling tension are required. For example, when the paper is thick or wide, the gravity of the counterweight 46 in the uncoiling section is insufficient, and an auxiliary force needs to be added. At this time, the spring 45 can be used to apply the auxiliary force. The adjustment method is as follows: In the initial adjustment stage of paper uncoiling, adjust the tightness of the mounting screw 452, lock the mounting screw 452 so that the mounting head 451 cannot slide, and make the spring 45 work; the magnitude of the auxiliary force can be adjusted according to the height at which the mounting head 451 is fixed. The higher the position, the greater the added auxiliary force, and the position can be adjusted according to the required magnitude of the auxiliary force; in the automatic adjustment stage of the uncoiling tension in the above embodiment, under the action of the uncoiling tension of the paper, the swinging roller 42 is pulled up to overcome the gravity of the counterweight 46 and the spring force of the spring 45, driving the swinging rod 41 to rotate around the lower pivot pin 13. The swinging rod 41 then drives the connecting rod 43 to rise, causing the hook rod 44 to rotate around the upper pivot pin 12, so that the hook 441 drives the damping mechanism 3 to move obliquely downward to the left, and the damping belt 31 gradually loosens the friction wheel 21, so that the uncoiling shaft 2 rotates under the traction of the paper uncoiling tension to achieve the uncoiling of the wound paper 9; the higher the swinging roller 42 rises, the more the damping belt 31 loosens the friction wheel 21, so that the uncoiling of the wound paper is faster; when the swinging roller 42 rises until the damping belt 31 completely loosens the friction wheel 21, the uncoiling speed of the paper increases. When the uncoiling tension rapidly decreases under the inertial action of the wound paper and is insufficient to overcome the gravity of the counterweight 46 and the spring force of the spring 45, the swinging roller 42 descends under the simultaneous action of the gravity of the counterweight 46 and the spring force of the spring 45, and the link mechanism 4 drives the damping mechanism 3 to rise obliquely, so that the damping belt 31 gradually tightens the friction wheel 21, and the uncoiling shaft 2 gradually reduces the rotation speed under the action of the friction force, so that the uncoiling of the wound paper becomes slower, and the paper restores the uncoiling tension, so as to keep the uncoiling tension relatively constant. Obviously, this result is due to the spring force of the spring 45 increasing the magnitude of the uncoiling tension.

[0025] The technical solution of the present invention uses ordinary materials, is suitable for industrial production, and has realizability and practicability.

Claims

1. An automatic control device for small tension in paper unwinding and rewinding, comprising a wall panel (1) on the main equipment, and a freely rotatable unwinding shaft (2) is cantilever-mounted on the wall panel (1). The unwinding shaft (2) fixes the paper roll in the form of an air shaft. It is characterized in that: A friction wheel (21) is fixedly installed at the end of the unwinding shaft (2) against the wall panel (1). There is a set of floating damping mechanisms (3) outside the friction wheel (21). The damping mechanism (3) is obliquely hinged and installed on a set of link mechanisms (4), and there are two support pins (11) installed on the wall panel below; the link mechanism (4) is hinged and installed on the wall panel (1) through an upper pin (12) and a lower pin (13); on the wall panel (1), there are also three freely rotatable rollers installed on the left side of the link mechanism (4): a flattening roller (5) at the upper part, a tension roller (6) in the middle, and a turning roller (7) at the lower part; on the left side of the tension roller (6), there is also a set of paper pressing wheels (8), and the paper pressing wheels (8) are also fixedly installed on the wall panel (1). The damping mechanism (3) includes a damping belt (31) that surrounds at least half of the outer surface of the friction wheel (21). The damping belt (31) is wrapped with a reinforcing steel belt (32). The damping belt (31) and the reinforcing steel belt (32) are superimposed and fixed on a Y-shaped fork handle (33) with screws. There is a long hole in the middle of the Y-shaped fork handle (33). There is a sliding block (34) fixed on the link mechanism (4) in the long hole. The sliding block (34) is connected to an adjusting screw (35). The adjusting screw (35) is installed on the Y-shaped fork handle (33) by threads and locked with a locking nut (36). The link mechanism (4) includes a swinging rod (41). A swinging roller (42) is installed at the left end of the swinging rod (41). A connecting rod (43) is vertically hinged and installed in the middle. The upper end of the connecting rod (43) is hinged and installed with a hook rod (44); the right end of the swinging rod (41) is connected with a spring (45). An installation head (451) with a long hole is fixed at the upper end of the spring (45). The installation head (451) is installed on the wall panel (1) through an installation screw (452); a weight block (46) with an adjustable position is also installed on the left side of the swinging rod (41). A limit pin (14) is fixed on the wall panel (1) above the right side of the swinging rod (41); there is a hinged hole matching the lower pin (13) opened in the middle of the swinging rod (41) on the right side of the connecting rod (43). The right end of the hook rod (44) has a hook (441), and there is a hinged hole on the hook (441) that matches the upper pin (12).

2. A method for automatically controlling small tension during paper unwinding and rewinding, which is used to implement the paper unwinding and rewinding small tension automatic control device described in claim 1, characterized in that The following method is adopted: Initial adjustment of the device: Adjust the position of the weight block (46) of the link mechanism (4) to make the swinging roller (42) drop to the lowest position by gravity, that is, the swinging rod (41) rotates around the lower pin (13) to the right and touches the limit pin (14); then adjust the relative position of the sliding block (34) and the Y-shaped fork handle (33) through the adjusting screw (35) and the locking nut (36) to make the damping belt (31) completely hold the friction wheel (21); adjust the tightness of the installation screw (452), and lock the installation screw (452) so that the installation head (451) cannot slide, and make the spring (45) work. Initial adjustment of paper unrolling: Install the rolled paper (9) on the unrolling shaft (2) and fix it by air inflation method, so that the head of the paper is unrolled counterclockwise with the head facing upward. The paper bypasses the flattening roller (5), the swing roller (42), and the tension roller (6) in sequence. After bypassing the tension roller (6), press the paper with the paper pressing wheel (8), bypass the turning roller (7), then pass through other devices of the main equipment, and form the tension of the paper through the tensioning of the main equipment and transmit it to the unrolling section to form an unrolling tension to drive the rolled paper (9) to unroll passively; Automatic adjustment of unrolling tension: Under the action of the unrolling tension, the paper overcomes the gravity of the counterweight (46) and the spring force of the spring (45) to pull the swing roller (42) upward, driving the swing rod (41) to rotate around the lower pin (13). The swing rod (41) then drives the connecting rod (43) upward, causing the hook rod (44) to rotate around the upper pin (12), so that the hook (441) drives the damping mechanism (3) to move obliquely downward to the left, and the damping belt (31) gradually loosens the friction wheel (21), so that the unrolling shaft (2) rotates under the traction of the paper unrolling tension to achieve the unrolling of the rolled paper (9); When the swing roller (42) rises until the damping belt (31) completely loosens the friction wheel (21), the unrolling speed of the paper increases. When the unrolling tension rapidly decreases under the inertia of the rolled paper and is not enough to overcome the gravity of the counterweight (46) and the spring force of the spring (45), the swing roller (42) descends under the simultaneous action of the gravity of the counterweight (46) and the spring force of the spring (45). The linkage mechanism (4) drives the damping mechanism (3) to rise obliquely, so that the damping belt (31) gradually tightens the friction wheel (21), and the unrolling shaft (2) gradually reduces the rotation speed under the action of friction, so that the unrolling of the rolled paper slows down and the paper restores the unrolling tension.

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