A method and apparatus for controlling roll changing of roll material

Abstract

This invention provides a method and apparatus for controlling roll material changing, belonging to the field of printing press technology. The method includes the following steps: S1: When the first motor drives the first roll of material to almost complete unwinding, the second roll of material begins to rotate, and the linear speed of the second roll is kept the same as that of the first roll; S2: The receiving pressure roller presses down on the film conveyed by the first roll of material, maintaining a constant torque based on the torque value collected by the driver of the first roll of material, while simultaneously maintaining a constant tension in the film between the first roll of material and the receiving pressure roller; S3: When the receiving pressure roller presses down on the film conveyed by the first roll of material until it contacts the tape on the film of the second roll of material, the film conveyed by the second roll of material continues to be conveyed by the first roll of material, allowing the second roll of material to unwind instead of the first roll of material, and the cutter cuts off the excess material on the film conveyed by the first roll of material. The beneficial effects of this invention are: preventing excessive fluctuations in film tension and ensuring the stability of the material changing operation.

Description

Technical Field

[0001] This invention belongs to the field of printing press technology and relates to a method and device for controlling roll material changing. Background Technology

[0002] In the existing technology, when the old roll of material is about to be exhausted during the operation of the roll gravure printing machine, a roll replacement operation is required. The film is smoothly transferred from the old roll to the new roll using a tape.

[0003] In the material handling process, ensuring the registration accuracy of the gravure printing press during printing operations is crucial, and the stability of the film tension during the transfer of the film from the old roll to the new roll is extremely important. If the film tension fluctuates too much, or if the material handling operation is not stable enough, resulting in unsuccessful material handling, it will directly affect the registration accuracy during the printing process, leading to material waste and reduced production efficiency, indicating significant room for improvement. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a method and apparatus for controlling roll material changing.

[0005] The objective of this invention can be achieved through the following technical solution: a method for controlling roll changing of roll material, comprising the following steps:

[0006] S1: When the first motor drives the first roll of material to be unwound and is about to complete, the second roll of material is made to start rotating and the linear speed of the second roll of material is kept the same as that of the first roll of material.

[0007] S2: The receiving pressure roller presses down on the film conveyed by the first roll of material, and keeps the torque constant according to the torque value collected by the driver of the first roll of material, while keeping the tension of the film between the first roll of material and the receiving pressure roller in a constant state of tension.

[0008] S3: When the receiving roller presses down on the film conveyed by the first roll until it contacts the tape of the film on the second roll, the film conveyed by the second roll continues to be conveyed by the first roll, so that the second roll replaces the first roll for unwinding, and the cutter cuts off the material head on the film conveyed by the first roll.

[0009] In the above-mentioned method for controlling the changing of roll material, in step S1, the ultrasonic sensor detects the diameter of the second roll material based on the distance between the ultrasonic probe and the second roll material, so that the linear velocity of the second roll material when rotating is the same as that of the first roll material.

[0010] In the above-mentioned roll material changing control method, in step S3, when the tape of the second roll material film enters the unwinding, the reflective photoelectric eye receives the reflector signal that was originally covered by the tape, and controls the cutter to cut off the material head on the material film conveyed by the first roll.

[0011] In the above-mentioned roll material changing control method, in step S3, when the cutter starts cutting the material head on the material film conveyed by the first roll, the air blowing pipe blows air on the material head on the material film conveyed by the first roll in the opposite direction of the transport direction.

[0012] In the above-mentioned roll material changing control method, in step S3, after the cutter cuts off the material head on the material film conveyed by the first roll, the driver of the first roll drives the first motor to provide reverse torque, thereby causing the first motor to rotate in the reverse direction and retract the material head on the material film conveyed by the first roll.

[0013] Secondly, a roll material changing device, which applies the aforementioned roll material changing control method, includes:

[0014] A material roll holder is provided with a first material roll, a first motor, a second material roll, and a second motor. The first motor can drive the first material roll to rotate, and the second motor can drive the second material roll to rotate. The second material roll has an adhesive tape.

[0015] The feeding seat is equipped with a receiving pressure roller. The first material roll feeds the film of the first material roll toward the feeding seat. The film of the first material roll is located between the receiving pressure roller and the tape. The receiving pressure roller can press down to make the film fed by the first material roll adhere to the tape, so that the film fed by the second material roll continues to be fed by the film of the first material roll.

[0016] The aforementioned roll material changing device also includes a cutter, which is disposed on the feed seat and aligned with the material film conveyed by the first roll. The cutter is used to cut off the material head on the material film conveyed by the first roll.

[0017] In the above-mentioned roll material changing device, an air blowing pipe is also included. The air blowing pipe is disposed at the feed seat and aligned with the material film conveyed by the first roll. The air blowing pipe is used to blow air onto the material head on the material film conveyed by the first roll in the opposite direction of the transport direction.

[0018] In the above-mentioned roll material changing device, a reflective photoelectric sensor and a reflector are also included. The reflector is disposed on the second roll material, the reflective photoelectric sensor is disposed on the feed seat and aligned with the reflector, the cutter is electrically connected to the reflective photoelectric sensor, and the tape is located between the reflective photoelectric sensor and the reflector and blocks the signal of the reflector. When the tape leaves the second roll material, the reflective photoelectric sensor can receive the signal of the reflector and thus control the cutter.

[0019] The above-mentioned roll material changing device also includes an ultrasonic sensor. The ultrasonic sensor is disposed on the roll holder and electrically connected to the second motor. The second motor is electrically connected to the ultrasonic sensor. The ultrasonic sensor is used to measure the diameter of the second roll and control the second motor.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. Before the first roll is unwound, the second roll is started to rotate and its linear speed is kept the same as that of the first roll. After the first and second rolls reach linear speed synchronization, the receiving pressure roller presses down on the film conveyed by the first roll. The torque is kept constant according to the torque value collected by the driver of the first roll. At the same time, the tension of the film between the first roll and the receiving pressure roller is kept constant. After receiving the material, the material head on the film conveyed by the first roll is cut off by the cutter to prevent excessive fluctuations in the tension of the film and ensure the stability of the material receiving and changing operation.

[0022] 2. The diameter of the second roll is automatically detected by an ultrasonic sensor based on the distance between the ultrasonic probe and the second roll, thereby ensuring that the linear speed of the second roll is synchronized with that of the first roll to the greatest extent and ensuring the accuracy of the synchronization of the two linear speeds.

[0023] 3. The tape of the film material on the second roll is located between the reflective photoelectric sensor and the reflector and blocks the signal of the reflector. When the film material conveyed by the second roll is connected to the film material conveyed by the first roll and the tape leaves the second roll, the reflective photoelectric sensor can receive the signal of the reflector and thus control the cutter to cut off the material head on the film material conveyed by the first roll. Therefore, after the connection is completed, the cutter can be automatically controlled to cut off the material head.

[0024] 4. The air blowing pipe blows air in the opposite direction to the material head on the film conveyed by the first roll, ensuring that the cut material head on the film conveyed by the first roll will not be rolled into other rollers due to inertia, thus improving the stability and reliability of roll changing.

[0025] 5. The first motor rotates in the opposite direction and retracts the material head on the film conveyed by the first roll, ensuring that the cut material head on the film conveyed by the first roll will not be rolled into other rollers due to inertia, thus improving the stability and reliability of roll changing. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the roll material changing device of the present invention.

[0027] Figure 2 This is a schematic diagram of the roll material changing device of the present invention.

[0028] Figure 3 This is a schematic diagram of the control method for the roll material changing device of the present invention.

[0029] In the diagram, 100 is the material roll holder; 110 is the first material roll; 120 is the second material roll; 130 is the reflector; 140 is the ultrasonic sensor; 200 is the feed seat; 210 is the receiving pressure roller; 220 is the cutter; 230 is the air blowing pipe; and 240 is the reflective photoelectric sensor. Detailed Implementation

[0030] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0032] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0035] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0036] like Figures 1-3 As shown, a method for controlling roll changing of roll material includes the following steps:

[0037] S1: When the first motor drives the first roll 110 to be unwound, the second roll 120 starts to rotate and the linear speed of the second roll 120 is kept the same as the linear speed of the first roll 110.

[0038] S2: The receiving roller 210 presses down on the film conveyed by the first roll 110, and keeps the torque constant according to the torque value collected by the driver of the first roll 110, while keeping the tension of the film between the first roll 110 and the receiving roller 210 in a constant state of tension.

[0039] S3: When the receiving roller 210 presses down on the film conveyed by the first roll 110 until it contacts the tape of the film on the second roll 120, the film conveyed by the second roll 120 continues to be conveyed by the first roll 110, so that the second roll 120 replaces the first roll 110 for unwinding, and the cutter 220 cuts off the material head on the film conveyed by the first roll 110.

[0040] In this embodiment, before the first roll 110 is unwound, the second roll 120 is started to rotate and its linear speed is kept the same as that of the first roll 110. After the first roll 110 and the second roll 120 reach linear speed synchronization, the receiving roller 210 presses down on the film conveyed by the first roll 110. The torque is kept constant according to the torque value collected by the driver of the first roll 110. At the same time, the tension of the film between the first roll 110 and the receiving roller 210 is kept in a constant taut state. After receiving the material, the material head on the film conveyed by the first roll 110 is cut off by the cutter 220 to prevent excessive fluctuations in the tension of the film and ensure the stability of the receiving and changing operation.

[0041] like Figures 1-3 As shown, based on the above embodiment, in step S1, the ultrasonic sensor 140 detects the diameter of the second roll 120 according to the distance between the ultrasonic probe and the second roll 120, so that the linear velocity of the second roll 120 when rotating is the same as the linear velocity of the first roll 110.

[0042] In this embodiment, the ultrasonic sensor 140 automatically detects the diameter of the second roll 120 based on the distance between the ultrasonic probe and the second roll 120, thereby ensuring that the linear speed of the second roll 120 is synchronized with the linear speed of the first roll 110 to the greatest extent, and ensuring the accuracy of the synchronization of the two linear speeds.

[0043] like Figures 1-3 As shown, based on the above embodiment, in step S3, when the tape of the film on the second roll 120 enters the unwinding, the reflective photoelectric eye 240 receives the signal from the reflector 130, which was originally covered by the tape, and controls the cutter 220 to cut the material head on the film conveyed by the first roll 110.

[0044] In this embodiment, the tape of the film material on the second roll 120 is located between the reflective photoelectric sensor 240 and the reflector 130 and blocks the signal of the reflector 130. When the film material conveyed by the second roll 120 is connected to the film material conveyed by the first roll 110, the tape leaves the second roll 120. The reflective photoelectric sensor 240 can receive the signal of the reflector 130 and control the cutter 220 to cut off the material head on the film material conveyed by the first roll 110. Therefore, after the connection is completed, the cutter 220 can be automatically controlled to cut off the material head.

[0045] like Figures 1-3 As shown, based on the above embodiment, in step S3, when the cutter 220 starts cutting the material head on the material film conveyed by the first material roll 110, the air blowing pipe 230 blows air on the material head on the material film conveyed by the first material roll 110 in the opposite direction of the transport direction.

[0046] In this embodiment, the air blowing pipe 230 blows air in the opposite direction to the material head on the material film conveyed by the first roll 110, ensuring that the cut material head on the material film conveyed by the first roll 110 will not be rolled into other rollers due to inertial forward movement, thereby improving the stability and reliability of roll switching.

[0047] like Figures 1-3 As shown, based on the above embodiment, in step S3, after the cutter 220 cuts the material head on the material film conveyed by the first material roll 110, the driver of the first material roll 110 drives the first motor to provide reverse torque, thereby causing the first motor to rotate in the opposite direction and retract the material head on the material film conveyed by the first material roll 110.

[0048] In this embodiment, the first motor rotates in the opposite direction and retracts the material head on the material film conveyed by the first roll 110, ensuring that the cut material head on the material film conveyed by the first roll 110 will not be rolled into other rollers due to inertial forward movement, thereby improving the stability and reliability of roll switching.

[0049] like Figure 1 , Figure 2As shown, a roll material changing device, applying the aforementioned roll material changing control method, includes:

[0050] The material roll holder 100 is provided with a first material roll 110, a first motor, a second material roll 120 and a second motor. The first motor can drive the first material roll 110 to rotate, and the second motor can drive the second material roll 120 to rotate. The second material roll 120 has an adhesive tape.

[0051] The feed seat 200 is provided with a receiving pressure roller 210. The first material roll 110 feeds the material film of the first material roll 110 toward the feed seat 200. The material film of the first material roll 110 is located between the receiving pressure roller 210 and the tape. The receiving pressure roller 210 can press down the material film fed by the first material roll 110 to adhere to the tape, so that the material film fed by the second material roll 120 continues to be fed by the material film of the first material roll 110.

[0052] In this embodiment, before the first roll 110 is unwound, the second roll 120 is started to rotate and its linear speed is kept the same as that of the first roll 110. After the first roll 110 and the second roll 120 reach linear speed synchronization, the receiving roller 210 presses down on the film conveyed by the first roll 110. The torque is kept constant according to the torque value collected by the driver of the first roll 110. At the same time, the tension of the film between the first roll 110 and the receiving roller 210 is kept in a constant taut state. After receiving the material, the material head on the film conveyed by the first roll 110 is cut off by the cutter 220 to prevent excessive fluctuations in the tension of the film and ensure the stability of the receiving and changing operation.

[0053] like Figure 1 , Figure 2 As shown, based on the above embodiment, a cutter 220 is also included. The cutter 220 is disposed on the feed seat 200 and aligned with the material film conveyed by the first material roll 110. The cutter 220 is used to cut off the material head on the material film conveyed by the first material roll 110.

[0054] In this embodiment, the cutter 220 can cut off the material head on the material film conveyed by the first roll 110, thereby preventing the material film conveyed by the first roll 110 from continuing to advance and interfering with the material film conveyed by the second roll 120, thus improving the stability and reliability of roll switching.

[0055] Preferably, the first motor can rotate in the opposite direction to retract the material head on the material film conveyed by the first roll 110, ensuring that the cut material head on the material film conveyed by the first roll 110 will not be rolled into other rollers due to inertial forward movement, thereby improving the stability and reliability of roll changing.

[0056] like Figure 1 , Figure 2 As shown, based on the above embodiment, it also includes an air blowing pipe 230. The air blowing pipe 230 is disposed on the feed seat 200 and aligned with the material film conveyed by the first material roll 110. The air blowing pipe 230 is used to blow air onto the material head on the material film conveyed by the first material roll 110 in the opposite direction of the transport direction.

[0057] In this embodiment, the air blowing pipe 230 blows air in the opposite direction to the material head on the material film conveyed by the first roll 110, ensuring that the cut material head on the material film conveyed by the first roll 110 will not be rolled into other rollers due to inertial forward movement, thereby improving the stability and reliability of roll switching.

[0058] like Figure 1 , Figure 2 As shown, based on the above embodiment, it also includes a reflective photoelectric sensor 240 and a reflector 130. The reflector 130 is disposed on the second material roll 120, and the reflective photoelectric sensor 240 is disposed on the feed seat 200 and aligned with the reflector 130. The cutter 220 is electrically connected to the reflective photoelectric sensor 240. The tape is located between the reflective photoelectric sensor 240 and the reflector 130 and blocks the signal of the reflector 130. When the tape leaves the second material roll 120, the reflective photoelectric sensor 240 can receive the signal of the reflector 130 and thus control the cutter 220.

[0059] In this embodiment, the tape of the film material on the second roll 120 is located between the reflective photoelectric sensor 240 and the reflector 130 and blocks the signal of the reflector 130. When the film material conveyed by the second roll 120 is connected to the film material conveyed by the first roll 110, the tape leaves the second roll 120. The reflective photoelectric sensor 240 can receive the signal of the reflector 130 and control the cutter 220 to cut off the material head on the film material conveyed by the first roll 110. Therefore, after the connection is completed, the cutter 220 can be automatically controlled to cut off the material head.

[0060] like Figure 1 , Figure 2 As shown, based on the above embodiment, an ultrasonic sensor 140 is also included. The ultrasonic sensor 140 is disposed on the material roll holder 100 and electrically connected to the second motor. The second motor is electrically connected to the ultrasonic sensor 140. The ultrasonic sensor 140 is used to measure the diameter of the second material roll 120 and control the second motor.

[0061] In this embodiment, the ultrasonic sensor 140 automatically detects the diameter of the second roll 120 based on the distance between the ultrasonic probe and the second roll 120, thereby ensuring that the linear speed of the second roll 120 is synchronized with the linear speed of the first roll 110 to the greatest extent, and ensuring the accuracy of the synchronization of the two linear speeds.

Claims

1. A method for controlling roll changing of roll material, characterized in that, Including the following steps: S1: When the first motor drives the first roll of material to be unwound and is about to complete, the second roll of material is made to start rotating and the linear speed of the second roll of material is kept the same as that of the first roll of material. S2: The receiving pressure roller presses down on the film conveyed by the first roll of material, and keeps the torque constant according to the torque value collected by the driver of the first roll of material, while keeping the tension of the film between the first roll of material and the receiving pressure roller in a constant taut state, wherein the receiving pressure roller is set on the feed seat. S3: When the receiving roller presses down on the film conveyed by the first roll until it contacts the tape of the film on the second roll, the film conveyed by the second roll continues to be conveyed by the first roll, so that the second roll replaces the first roll for unwinding, and the cutter cuts off the material head on the film conveyed by the first roll. In step S3, when the tape on the second roll of material enters the unwinding process, the reflective photoelectric sensor receives the signal from the reflector that was originally covered by the tape, and controls the cutter to cut the material head on the material conveyed by the first roll of material. The reflector is located on the second roll of material, and the reflective photoelectric sensor is located on the feed seat and aligned with the reflector.

2. The method for controlling roll changing as described in claim 1, characterized in that: In step S1, the ultrasonic sensor detects the diameter of the second roll based on the distance between the ultrasonic probe and the second roll, thereby keeping the linear velocity of the second roll rotating the same as that of the first roll.

3. The method for controlling roll changing as described in claim 1, characterized in that: In step S3, when the cutter starts cutting the material head on the material film being transported by the first roll, the air blowing pipe blows air onto the material head on the material film being transported by the first roll in the opposite direction of the transport direction.

4. The method for controlling roll changing as described in claim 3, characterized in that: In step S3, after the cutter cuts off the material head on the material film conveyed by the first roll, the driver of the first roll drives the first motor to provide reverse torque, thereby causing the first motor to rotate in the opposite direction and retract the material head on the material film conveyed by the first roll.

5. A roll material changing device, characterized in that, The method for controlling roll changing of materials as described in any one of claims 1-4 includes: A material roll holder is provided with a first material roll, a first motor, a second material roll, and a second motor. The first motor can drive the first material roll to rotate, and the second motor can drive the second material roll to rotate. The second material roll has an adhesive tape. The feeding seat is equipped with a receiving pressure roller. The first material roll feeds the film of the first material roll toward the feeding seat. The film of the first material roll is located between the receiving pressure roller and the tape. The receiving pressure roller can press down to make the film fed by the first material roll adhere to the tape, so that the film fed by the second material roll continues to be fed by the film of the first material roll.

6. The roll changing device as described in claim 5, characterized in that: It also includes a cutter, which is disposed on the feed seat and aligned with the film conveyed by the first roll, and the cutter is used to cut off the material head on the film conveyed by the first roll.

7. The roll changing device as described in claim 5, characterized in that: It also includes an air blowing pipe, which is disposed on the feed seat and aligned with the film conveyed by the first roll. The air blowing pipe is used to blow air onto the material head on the film conveyed by the first roll in the opposite direction of the transport direction.

8. The roll changing device as described in claim 7, characterized in that: It also includes a reflective photoelectric sensor and a reflector. The cutter is electrically connected to the reflective photoelectric sensor. The tape is located between the reflective photoelectric sensor and the reflector and blocks the signal of the reflector. When the tape leaves the second roll, the reflective photoelectric sensor can receive the signal of the reflector to control the cutter.

9. A roll material changing device as described in claim 8, characterized in that: It also includes an ultrasonic sensor, which is disposed on the material roll holder and electrically connected to the second motor. The second motor is electrically connected to the ultrasonic sensor, and the ultrasonic sensor is used to measure the diameter of the second material roll and control the second motor.

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