Dual-drive independent unwinding mechanism

Abstract

The utility model discloses a dual-drive independent unwinding mechanism which comprises an unwinding support, two feeding rollers and a deviation rectifying roller are arranged on the unwinding support, one feeding roller is connected with a first driving motor, the two feeding rollers are in transmission through a gear, the deviation rectifying roller is connected with a second driving motor, and the deviation rectifying roller is connected with a second driving motor. The first driving motor independently drives the two feeding rollers to rotate, and the second driving motor independently drives the deviation rectifying roller to rotate, so that the synchronous moving distance of the fabric on the feeding rollers and the deviation rectifying roller is guaranteed, and the situation that the fabric and the feeding rollers or the deviation rectifying roller generate relative displacement friction due to tension change after error accumulation is prevented; the surface of the fabric is prevented from fuzzing, so that the printing quality is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of digital printing equipment, and more specifically relates to a double-drive independent unwinding mechanism. Background Art

[0002] In digital printing equipment for fabrics, a feeding mechanism is required. First, the fabric end is continuously and cross-wound around two feeding rollers manually, then the fabric end is pulled and wound around a deviation rectifying roller, and finally, after passing through a tension mechanism, the fabric end is placed on a conveyor belt. A driving motor is connected to the deviation rectifying roller. At the same time, the deviation rectifying roller drives one of the feeding rollers to rotate synchronously through a chain transmission mechanism, and the rotating feeding roller drives the other feeding roller to rotate synchronously through a gear transmission. That is, one motor drives the deviation rectifying roller and the two feeding rollers to rotate synchronously. The rotation of the feeding rollers can pull the fabric wound on the A-frame, realizing the conveying of the fabric.

[0003] The diameter of the deviation rectifying roller is larger than that of the feeding roller. Therefore, the chain transmission mechanism between the deviation rectifying roller and the feeding roller is an acceleration mechanism, that is, the rotation speed of the deviation rectifying roller is less than that of the feeding roller. In order to be able to pull the fabric, rough friction strips are adhered to their surfaces, and the fabric is driven by the static friction force between the rough surface of the friction strips and the fabric. However, since neither the feeding roller nor the deviation rectifying roller is a precision roller, there are certain errors in their diameter dimensions. Coupled with the adhered friction strips, although the deviation rectifying roller and the feeding roller rotate synchronously, there is an error in the rotation distance between their surfaces. When feeding and rectifying non-elastic fabrics, the accumulated error will change the fabric tension, and then relative displacement friction will occur between the fabric and the surface of the feeding roller or the deviation rectifying roller. The rough surface of the friction strips may cause the fabric surface to fluff, affecting the printing quality. Content of the Utility Model

[0004] In view of the deficiencies of the prior art, the utility model provides a double-drive independent unwinding mechanism, which reduces the error generated between the rollers during fabric conveying, preventing the fabric from fluffing due to relative displacement friction on the roller surface and improving the printing quality.

[0005] To achieve the above object, the utility model provides the following technical solution: A double-drive independent unwinding mechanism includes an unwinding support. Two feeding rollers and a deviation rectifying roller are arranged on the unwinding support. A first driving motor is connected to one of the feeding rollers, and the two feeding rollers are driven by gear transmission. A second driving motor is connected to the deviation rectifying roller.

[0006] Further, a first tension adjusting mechanism is arranged on the unwinding support. The first tension adjusting mechanism includes a tension support, which is rotatably connected to the unwinding support. Two first tension rollers are rotatably connected to the tension support. The rotating shaft of one of the first tension rollers is coaxial with the rotating shaft of the tension support, and the other first tension roller is located at the free end of the tension support.

[0007] Further, a limiting mechanism is provided between the tension support and the unwinding support. The limiting mechanism includes a limiting induction sheet located on the tension support and limiting sensors located on both sides of the limiting induction sheet.

[0008] Further, a second tension adjusting mechanism is provided on the unwinding support. The second tension adjusting mechanism includes a lifting rod and a second tension roller rotatably connected to the lifting rod. The lifting rod is slidably connected to the unwinding support in a lifting manner.

[0009] Further, a main sprocket and a sub-sprocket are provided on the unwinding support. The main sprocket and the sub-sprocket are connected by a chain drive. An angular displacement encoder is connected to the main sprocket. The lifting rod is connected to one side of the chain.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows: The two feeding rollers are driven to rotate independently by the first driving motor, and the deviation correcting roller is driven to rotate independently by the second driving motor, so that the fabric can ensure the same moving distance on the feeding rollers and the deviation correcting roller, preventing the relative displacement friction between the fabric and the feeding rollers or the deviation correcting roller caused by the tension change after the error accumulation, avoiding the fabric surface from pilling, and thus improving the printing quality. Description of the Drawings

[0011] Figure 1 It is a structural schematic diagram of the double-drive independent unwinding mechanism of the present utility model.

[0012] Reference Numerals: Unwinding Support 1; Feeding Roller 2; Deviation Correcting Roller 3; First Driving Motor 4; Second Driving Motor 5; Tension Support 6; First Tension Roller 7; Limiting Mechanism 8; Second Tension Roller 9; Main Sprocket 10; Sub-Sprocket 11; Chain 12; Angular Displacement Encoder 13. Detailed Embodiments

[0013] In the description of the present utility model, it should be noted that for the orientation terms, if there are terms such as "center", "transverse (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and position relationships indicated are based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present utility model.

[0014] In addition, terms such as "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meanings of "several" and "a number of" are two or more, unless otherwise specifically defined.

[0015] Refer to Figure 1 for further description of the present utility model.

[0016] A double-drive independent unwinding mechanism includes an unwinding bracket 1, on which two feeding rollers 2 and a deviation rectifying roller 3 are arranged. A first driving motor 4 is connected to one of the feeding rollers 2, and the two feeding rollers 2 are driven by gears. A second driving motor 5 is connected to the deviation rectifying roller 3.

[0017] Preferably in this embodiment, both the first driving motor 4 and the second driving motor 5 are high-precision servo motors.

[0018] As Figure 1 shown, the two feeding rollers 2 are driven to rotate separately by the first driving motor 4, and the deviation rectifying roller 3 is driven to rotate separately by the second driving motor 5, so as to ensure the synchronous moving distance of the fabric on the feeding rollers 2 and the deviation rectifying roller 3, prevent the fabric from having relative displacement friction with the feeding rollers 2 or the deviation rectifying roller 3 due to the tension change after error accumulation, avoid the fabric surface from fluffing, and thus improve the printing quality.

[0019] By controlling the first driving motor 4 and the second driving motor 5, the rotation speed is adjusted according to the dimensional error between the feeding rollers 2 and the deviation rectifying roller 3 to achieve the synchronous movement of the fabric on the feeding rollers 2 and the deviation rectifying roller 3.

[0020] As Figure 1 shown, preferably in this embodiment, a first tension adjusting mechanism is arranged on the unwinding bracket 1. The first tension adjusting mechanism includes a tension bracket 6, which is rotatably connected to the unwinding bracket 1. Two first tension rollers 7 are rotatably connected to the tension bracket 6. The rotating shaft of one of the first tension rollers 7 is coaxial with the rotating shaft of the tension bracket 6, and the other first tension roller 7 is located at the free end of the tension bracket 6.

[0021] As Figure 1 shown, when conveying the fabric, the first tension roller 7 at the free end of the tension bracket 6 is located above the fabric, and the first tension roller 7 coaxial with the rotating shaft of the tension bracket 6 is located below the fabric. The self-weight of the tension bracket 6 is used to press the first tension roller 7 at its free end onto the fabric, thereby providing tension.

[0022] As Figure 1As shown, in this embodiment, preferably, a limiting mechanism 8 is arranged between the tension bracket 6 and the unwinding bracket 1, and the limiting mechanism 8 includes a limiting sensing plate located on the tension bracket 6 and limit sensors located on both sides of the limiting sensing plate, and the position of the limiting sensing plate is detected by the limit sensors.

[0023] like Figure 1 As shown, in this embodiment, preferably, a second tension adjustment mechanism is provided on the unwinding bracket 1, and the second tension adjustment mechanism includes a lifting rod and a second tension roller 9 rotatably connected to the lifting rod, and the lifting rod is connected to the unwinding bracket 1 in a lifting and sliding manner.

[0024] like Figure 1 As shown, the fabric passes under the second tension roller 9, and the fabric is tensioned by the lifting rod and the deadweight of the second tension roller 9. The height of the lifting rod reflects the change of tension on the fabric.

[0025] like Figure 1 As shown, in the present embodiment, preferably, the unwinding bracket 1 is provided with a main sprocket 10 and a secondary sprocket 11, and the main sprocket 10 and the secondary sprocket 11 are connected to each other through a chain 12. An angular displacement encoder 13 is connected to the main sprocket 10, and the lifting rod is connected to one side of the chain 12. The lifting and lowering changes of the lifting rod and the second tension roller 9 are transmitted to the angular displacement encoder 13 through the main sprocket 10, so that the tension change data of the fabric can be detected in real time.

[0026] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A double-drive independent unwinding mechanism, characterized in that: It includes an unwinding support, on which two feeding rollers and a deviation rectifying roller are arranged. A first driving motor is connected to one of the feeding rollers, and the two feeding rollers are driven by gears. A second driving motor is connected to the deviation rectifying roller.

2. The double-drive independent unwinding mechanism according to claim 1, wherein: A first tension adjusting mechanism is arranged on the unwinding support. The first tension adjusting mechanism includes a tension support, which is rotatably connected to the unwinding support. Two first tension rollers are rotatably connected to the tension support. The rotating shaft of one of the first tension rollers is coaxial with the rotating shaft of the tension support, and the other first tension roller is located at the free end of the tension support.

3. The dual-drive independent unwind mechanism according to claim 2, characterized in that: A limiting mechanism is arranged between the tension support and the unwinding support. The limiting mechanism includes a limiting induction sheet located on the tension support and limiting sensors located on both sides of the limiting induction sheet.

4. The double-drive independent unwinding mechanism according to claim 1, wherein: A second tension adjusting mechanism is arranged on the unwinding support. The second tension adjusting mechanism includes a lifting rod and a second tension roller rotatably connected to the lifting rod. The lifting rod is connected to the unwinding support in a lifting and sliding manner.

5. The dual-drive independent unwinding mechanism according to claim 4, wherein: A main sprocket and a sub-sprocket are arranged on the unwinding support. The main sprocket and the sub-sprocket are connected by a chain drive. An angular displacement encoder is connected to the main sprocket. The lifting rod is connected to one side of the chain.

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