A feeding device for an elastic strip

Abstract

The utility model discloses a kind of feeding devices of elastic belt material, the device includes rack, dynamic storage unit and deviation rectifying unit, dynamic storage unit includes feed drive roller and discharge drive roller, and elastic belt material is transported forward with natural overhanging state between feed drive roller and discharge drive roller, by adjusting the relative speed of feed drive roller and discharge drive roller, to control the overhanging height of elastic belt material between feed drive roller and discharge drive roller, make the tension of elastic belt material after material roll output can be fully released, avoid material in subsequent processing due to tension instability causes size leg, lining curling etc. It can be widely applied to the processing field of elastic flexible material such as sanitary product, clothing etc.

Description

Technical Field

[0001] This utility model relates to the field of flexible elastic sheet processing technology, and in particular to a feeding device for elastic strips applicable to the processing of sanitary products and clothing. Background Technology

[0002] For example, in the processing of disposable underwear, the elastic strip needs to be tension-released before lamination to achieve a tension-free state before lamination with another material. Since the two materials have different elasticities, insufficient tension release can easily lead to shrinkage, curling, and deformation after lamination. Therefore, during the unwinding and feeding process of the elastic strip, a series of devices and methods are needed to release the tension of the elastic strip to ensure that it does not shrink or deform due to tension after lamination. To solve this problem, Chinese patent application CN202410461382.1 discloses a tension-free lamination method, system, and underwear processing method for elastic strips. This method involves configuring a feeding mechanism to unwind the elastic roll; setting multiple tension rollers for support in the conveying path of the elastic strip; and using a tension control component to perform graded control of the tension of the elastic strip. The control component is configured to include a traction roller group and a tension controller. The traction roller group adjusts the conveying speed of the elastic strip according to the detected tension signal, so that the tension of the elastic strip in its transmission section approaches a tension-free state, allowing for tension-free lamination with a non-elastic sheet.

[0003] However, using the above method, the elastic roll often carries its own tension during winding. During transmission, the tension value collected by the signal unit is unstable, causing the tension control component to malfunction and affecting the product yield. We know that if the tension is not fully released, defects such as wrinkles after the lining and elastic strip are combined, and unevenness after arc cutting, will occur after passing through the composite unit. Therefore, it is necessary to improve the existing process equipment to further ensure that the material tension is fully released, thereby improving the product yield. Summary of the Invention

[0004] The purpose of this invention is to provide a feeding device for elastic strips, which solves the problem that existing feeding devices cannot fully release the tension of elastic strips.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a feeding device for elastic strip material, comprising: a material rack for supporting the roll of elastic strip material; a dynamic storage unit including an infeed drive roller and an outfeed drive roller, wherein the elastic strip material is conveyed forward in a natural hanging state between the infeed drive roller and the outfeed drive roller, and the hanging height of the elastic strip material between the infeed drive roller and the outfeed drive roller is controlled by adjusting the relative speed of the infeed drive roller and the outfeed drive roller, so that the tension of the elastic strip material is released between the infeed drive roller and the outfeed drive roller. In the above technical solution, adjusting the relative speed of the infeed drive roller and the outfeed drive roller means that the speed of one or both of the infeed drive rollers and the outfeed drive roller can be adjusted; preferably, the outfeed drive roller is set to a constant speed to ensure the stability of the subsequent speed, and the speed of the infeed drive roller is adjusted to control the hanging height between the two rollers.

[0006] Furthermore, the dynamic storage unit includes a first dynamic storage unit that receives the elastic strip from the elastic roll and performs a first tension release; and a second dynamic storage unit that receives the elastic strip from the first dynamic storage unit and performs a second tension release; the second dynamic storage unit includes a feed drive roller and a discharge drive roller. The elastic strip is conveyed forward in a natural hanging state between the feed drive roller and the discharge drive roller. By adjusting the speed of the feed drive roller and the discharge drive roller, the hanging height of the elastic strip between the feed drive roller and the discharge drive roller is controlled, so that the tension of the elastic strip is released again between the feed drive roller and the discharge drive roller.

[0007] To sense the height of the lowest point of the elastic strip's natural sag, a sensor is installed above the lowest point of the elastic strip's natural sag. The sensor senses the position of the lowest point of the elastic strip's sag and controls the relative speed of the feed drive roller and the discharge drive roller, so that the position of the lowest point of the elastic strip's sag is always within the set height range, ensuring that the tension of the elastic strip is fully released.

[0008] The discharge drive roller is equipped with a negative pressure adsorption structure that allows the elastic strip to be attached to the surface of the discharge drive roller and conveyed forward. The diameter of the discharge drive roller is larger than that of the feed drive roller to ensure the smooth discharge of the elastic strip and avoid tension increase caused by stretching.

[0009] The beneficial effects of this invention are as follows: By coordinating a first dynamic storage unit and a second dynamic storage unit, the first dynamic storage unit first releases the tension of the elastic strip, and then the second dynamic storage unit releases it a second time. This ensures that the tension of the elastic strip is fully released after it is output from the roll, preventing defects such as curling of the legs and inner lining caused by unstable tension during subsequent processing, thereby improving the product qualification rate. In particular, the second dynamic storage unit adopts a natural suspension feeding method, allowing the elastic strip to fully release tension while suspended, offering advantages such as simple structure, low cost, and easy control.

[0010] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 This is a schematic diagram of the structure of the second dynamic storage unit in this utility model. Detailed Implementation

[0013] Examples, such as Figure 1 , Figure 2 As shown, a feeding device for elastic strips, through the improvement of the feeding device of this utility model, can fully release the tension of the elastic sheet on the roll, thereby avoiding the problems of wrinkles and large and small legs after the non-elastic sheet of the prepared disposable sanitary product is combined with the elastic sheet due to insufficient release of the stress of the elastic strip before composite, and the defects such as large and small legs after arc cutting.

[0014] The process of this utility model includes receiving elastic strip 10 from elastic roll 401 through a first dynamic storage unit 100 and performing a first tension release on the elastic strip 10; performing a second tension release on the elastic strip 10 through a second dynamic storage unit 200 after the first tension release; and then adjusting the elastic strip after the two tension releases through a correction unit 300 before outputting it for lamination with other sheets. The corresponding feeding device for the elastic strip includes a material rack 400 for supporting the elastic strip roll, a first dynamic storage unit 100 for realizing the first tension release, a second dynamic storage unit 200 disposed after the first dynamic storage unit 100, and a correction unit 300 disposed after the second dynamic storage unit 200.

[0015] The concept of this utility model is described in detail below through its structure and corresponding methods.

[0016] The elastic strip is wound and stored on an elastic roll 401. In use, the elastic roll 401 is placed on a rack 400 and unwound via the rack 400. After being released from the elastic roll 401, the elastic strip 10 enters the first dynamic storage unit 100 horizontally, where it undergoes a tension release. The first dynamic storage unit 100 includes a set of side-by-side spaced top guide rollers 101 and a set of side-by-side spaced bottom guide rollers 102. The elastic strip 10 shuttles back and forth between the top guide rollers 101 and the bottom guide rollers 102. Figure 1 As shown, the top guide roller 101 includes top guide rollers 101A, 101B, 101C, 101D and 101E arranged in sequence at intervals, and the bottom guide roller 102 includes bottom guide rollers 102A, 102B, 102C, 102D and 102E arranged in sequence at intervals. The elastic strip 10 enters the bottom guide roller 102A horizontally, then moves vertically upwards into the top guide roller 101A. The elastic strip 10 passes around the top guide roller 101A and moves vertically downwards into the bottom guide roller 102B, then passes around the bottom guide roller 102B and moves vertically upwards into the top guide roller 101B again, and so on. The elastic strip passes through the bottom guide roller 102C, top guide roller 101C, bottom guide roller 102D, top guide roller 101D and bottom guide roller 102E in sequence, and is finally output from the top guide roller 101E. The elastic strip 10 achieves tension release by shuttling back and forth between the top guide roller 101 and the bottom guide roller 102. The first dynamic storage unit can be referred to in the prior art CN111527038B, US11679951B2, etc., and will not be described in detail here.

[0017] After the elastic strip 10 is output from the top guide roller 101E, it enters the second dynamic storage unit 200, where the tension is released a second time, fully releasing the tension of the elastic strip 10. The second dynamic storage unit 200 includes a feed drive roller 201 that engages with the first dynamic storage unit 100 to apply traction force to the elastic strip 10 output from the top guide roller 101E, and an output drive roller 202 that outputs from the second dynamic storage unit 200. Each of the feed drive roller 201 and the output drive roller 202 has its own drive source, allowing independent control of their speeds. By adjusting the speeds of the feed drive roller 201 and the output drive roller 202, the elastic strip 10 is placed in a natural suspension state between the feed drive roller 201 and the output drive roller 202, allowing the elastic strip to freely release tension during this natural suspension process.

[0018] A pressure roller 203 is positioned above the feed drive roller 201. The elastic strip 10 passes between the feed drive roller 201 and the pressure roller 203, and the cooperation between the feed drive roller 201 and the pressure roller 203 drives the elastic strip 10 forward. A guide roller 204 is positioned at the feed end of the discharge drive roller 202. The guide roller 204 changes and adjusts the conveying direction of the elastic strip 10 and the angle at which it enters the discharge drive roller 202, ensuring that the elastic strip always enters the discharge drive roller 202 tangentially. The elastic strip 10 is in a naturally suspended state between the feed drive roller 201 and the guide roller 204.

[0019] To control the sag height of the elastic strip 10 between the feed drive roller 201 and the guide roller 204, and to ensure that the elastic strip 10 is fully released, the maximum and minimum sag required for stress release of the elastic strip 10 are calculated based on the relative distance and height difference between the feed drive roller 202 and the guide roller 204. The sag amount can be obtained from the height of the lowest sag point of the elastic strip 10. Through analysis and calculation, the height of the lowest sag point of the elastic strip 10 is between P1 and P2, and the tension of the elastic strip 10 can be effectively released. Therefore, during the conveying process, it is necessary to constantly monitor the position of the lowest sag point of the elastic strip 10, and adjust the speed of the feed drive roller 201 and the discharge drive roller 202 by monitoring the position to ensure that the lowest sag point of the elastic strip 10 is always between P1 and P2. The area between P1 and P2 is set as the optimal working area A.

[0020] To obtain the position information of the lowest point of the elastic strip 10, a sensor 205 is installed above the lowest point of the elastic strip 10 to obtain the height position of the lowest point of the elastic strip 10. When the sensor 205 senses that the lowest point of the elastic strip 10 is between P1 and P2, the feed drive roller 201 and the discharge drive roller 202 rotate at a preset working speed. When the lowest point of the elastic strip 10 is above P1, the feed drive roller 201 is accelerated and the discharge drive roller 202 is set to a constant speed so that the lowest point of the suspension returns to the optimal working area A. Similarly, when the lowest point of the elastic strip 10 is below P2, the feed drive roller 201 is decelerated and the discharge drive roller 202 is kept at a constant speed so that the lowest point of the suspension returns to the optimal working area A.

[0021] To ensure that the elastic strip 10 remains tension-free after the suspension stress is released, the diameter of the discharge drive roller 202 is larger than the diameter of the feed drive roller 201, thereby reducing the speed of the discharge drive roller 202. Simultaneously, a negative pressure adsorption structure 2021 is provided inside the discharge drive roller 202. This structure adheres the elastic strip 10 entering the discharge drive roller 202 to its surface and transports it forward. When the elastic strip 10 exits the discharge drive roller 202, the negative pressure adsorption structure 2021 stops working, allowing the elastic strip 10 to exit smoothly. The negative pressure adsorption structure 2021 includes a set of negative pressure adsorption holes 20211 evenly distributed on the discharge drive roller 202. A negative pressure device is connected to each negative pressure adsorption hole 20211, providing negative pressure to the holes. When adsorption is not needed, the negative pressure device stops providing negative pressure to the corresponding holes.

[0022] After the elastic strip 10 is discharged by the discharge drive roller 202, a correction unit 300 is provided on the discharge path to correct the elastic strip 10 and control and adjust the direction of travel of the elastic strip 10. The correction unit 300 can be a commonly used BST correction system, which will not be described in detail here.

[0023] This invention, through the structural design of the first dynamic storage unit 100 and the cooperation between the second dynamic storage unit 200, enables the elastic strip 10 to fully release its own stress before lamination, thereby ensuring that the laminated sheet will not deform and improving the product processing qualification rate.

[0024] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A feeding device for elastic strip, characterized in that, include: Material rack, used to support rolls of elastic strip material; The dynamic storage unit includes a feed drive roller and a discharge drive roller. The elastic strip is conveyed forward in a natural hanging state between the feed drive roller and the discharge drive roller. By adjusting the relative speed of the feed drive roller and the discharge drive roller, the hanging height of the elastic strip between the feed drive roller and the discharge drive roller is controlled so that the tension of the elastic strip is released between the feed drive roller and the discharge drive roller.

2. The feeding device for the elastic strip as described in claim 1, characterized in that, The dynamic storage unit has a first dynamic storage unit and a second dynamic storage unit. The first dynamic storage unit receives elastic strip from the elastic roll and performs a tension release once. The second dynamic storage unit receives elastic strip from the first dynamic storage unit and performs a tension release a second time. The second dynamic storage unit includes the feed drive roller and the discharge drive roller.

3. The feeding device for elastic strip as described in claim 1, characterized in that: A sensor is installed above the lowest point of the elastic strip's natural droop. The sensor detects the position of the lowest point of the elastic strip's droop and controls the relative speed of the feed drive roller and the discharge drive roller, so that the position of the lowest point of the elastic strip's droop is always in the set height range, so as to ensure that the tension of the elastic strip is fully released.

4. The feeding device for elastic strip as described in claim 1, characterized in that: The discharge drive roller is equipped with a negative pressure adsorption structure that allows the elastic strip to adhere to the surface of the discharge drive roller and be conveyed forward.

5. The feeding device for elastic strip as described in claim 1, characterized in that: A pressure roller is provided above the feed drive roller, and the elastic strip is conveyed forward under the action of the feed drive roller and the pressure roller; a guide roller is provided at the feed end of the discharge drive roller to change the conveying direction of the elastic strip.

6. The feeding device for elastic strip as described in claim 4, characterized in that: The diameter of the discharge drive roller is larger than that of the feed drive roller.

7. The feeding device for elastic strip as described in claim 2, characterized in that: The first dynamic storage unit includes a set of top guide rollers and a set of bottom guide rollers, and the elastic strip shuttles back and forth between the top guide rollers and the bottom guide rollers.

8. The feeding device for elastic strip as described in claim 1, characterized in that: A correction unit is also provided after the discharge drive roller.

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