JP3076242U - Tension adjusting device for unwinding wound material using magnet - Google Patents

Abstract

(57) [Summary] [Problem] Maintenance is easier than using an electromagnetic brake, a powder brake, a hysteresis brake, etc., and the adjustment range of the unwinding tension of the wound material can be freely changed, and it can be used for a long time. The present invention provides an inexpensive wound material unwinding tension adjusting device in which the braking force does not decrease and the temperature does not increase even when braking is performed continuously for a long time. SOLUTION: A magnet 7 is attached to a conductive brake plate 6 fitted on a spindle 2 loaded with a winding body 4.
Are arranged close to each other in a non-contact state, so that the roll guide member 11 rotates about the support shaft 9 in accordance with an increase or decrease in the unwinding tension detected when the roll 23 is unwound. Then, the magnet holding member 8 attached with the magnet also rotates, and the magnet moves between the edge and the center of the brake plate 6, so that the braking force acting on the brake plate is increased or decreased, and the wound material is unwound. The tension is adjusted.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a device for adjusting the unwinding tension of a wound material using a magnet.

[0002]

[Prior art]

 Conventionally, as a method of unwinding a wound material in a wound state, there is a rolling creel method of unwinding a wound material while rotating a wound body loaded on a spindle. As a tension adjusting device for unwinding a wound material, a device using an electromagnetic device such as an electromagnetic brake, a powder brake or a hysteresis brake is well known.

[0003]

[Problems to be solved by the invention]

 However, the electromagnetic brake has a relatively narrow range of adjustment of the unwinding tension of the wound material, whereas the powder brake has a reduced braking force if the powder is worn over a long period of use, or the brake will be braked continuously for a long time. If the brake is applied, the temperature of the brake will increase due to the friction caused by the powder.However, if the hysteresis brake is braked continuously for a long time like the powder brake, the temperature of the brake will increase due to the energization of the excitation coil. There was one side, and all the brakes were troublesome to disassemble and assemble, so maintenance was not easy and usability was not enough for the expensive price. The present invention solves the above-mentioned problems, facilitates maintenance, can freely change the adjustment range of the unwinding tension of the wound material, does not decrease the braking force even when used for a long time, and continuously operates for a long time. It is an object of the present invention to provide an unwinding tension adjusting device for an inexpensive wound material in which the temperature does not rise even when braking is performed.

[0004]

[Means for Solving the Problems]

 In a winding material unwinding tension adjusting device that unwinds a wound material while rotating the wound material loaded on a spindle, the wound material is rotatably fitted and a device frame is provided. A spindle that is rotatably inserted into the spindle, a conductive brake plate that is fitted to the spindle, and a magnet that can generate a braking force without contacting the brake plate when the wound material is unwound. A magnet holding member attached thereto, and a tension arm partially provided with a wound material guide member for detecting an increase or decrease in unwinding tension of the wound material unwound from the wound body, The tension arm and the magnet holding member are swingably connected to a support shaft using a support shaft supported by a bearing provided on the device frame as a fulcrum shaft, and a wound material guide is provided when the wound material is unwound. Unwinding tension of wound material detected by member By controlling the braking force by shifting the operating position of the magnet with respect to the brake plate in accordance with the fluctuation of the winding force, the tension that varies when the wound material is unwound is adjusted by controlling the unwinding tension of the wound material. Is appropriately adjusted.

[0005]

[Embodiment of the invention]

 A spring member locked to a locking member provided on the brake plate; and a pivot shaft fixed to the brake plate, rotatably provided on the support member, and slidably engaged with the spring member. And the swing lever, which is capable of converting a swing displacement of the swing lever when the wound material is unwound into a displacement of a gap between the magnet and the brake plate, is linked to the swing lever. The rotation of the brake plate is gradually increased as the winding diameter is reduced when unwinding the wound material. It does not cause an additional increase in the braking force generated between the plates.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an embodiment of the roll tension adjusting device of the present invention, FIG. 2 is a cross-sectional view of the roll tension adjusting device of FIG. 1, and FIG. FIG. 4 is a side view of the periphery of the brake plate in a case where a part of the unwinding tension adjusting device for wound material is another embodiment, and FIG. 4 shows the periphery of the brake plate of FIG. 3 cut along line X1-X2. It is sectional drawing. 1 and 2, a spindle 2 rotatably inserted into an apparatus frame 1 is loaded with a winding body 4 via bushes 3a and 3b. It is sandwiched between. Outside the device frame 1, an aluminum disk-shaped brake plate 6 is fixed to the tip of the spindle 2 via a boss 12, and is attached to a support shaft 9 supported by a bearing 25 provided on the device frame 1. The tension arm 10 and one end of the magnet holding member 8 are connected to be able to swing integrally with the support shaft 9 as a fulcrum shaft. A magnet 7 is attached to the other end of the magnet holding member 8 so as to face the brake plate 6, and the magnet 7 is kept close to the brake plate 6 in a non-contact state. At the other end of the tension arm 10, a roll guide 11 provided in parallel with the axis of the spindle 2 is attached. The wound wound material 23 is hung.

Next, the operation of the device of the present invention will be described. First, when the wound material 23 is pulled out in the direction of arrow A, the wound body 4 rotates and the wound material 23 is unwound, but the tension is increased due to the fluctuation of the unwinding tension of the wound material 23 at that time. In this case, the tension arm 10 stands up in the direction of arrow B1 with the support shaft 9 as a fulcrum axis, and the magnet holding member 8 moves in the direction of arrow B2 with the support shaft 9 as a fulcrum axis. Move from the edge to the center. Since the magnet 7 is close to the brake plate 6 and is kept in a non-contact state, when the brake plate 6 rotates when the wound material 23 is unwound, the hysteresis phenomenon generated between the magnet 7 and the brake plate 6 causes a vibration. Although a braking force is generated on the brake plate 6, as the position of the magnet 7 moves toward the center of the brake plate and the moment applied to the spindle shaft 2 decreases, the braking force also decreases. As a result, the tension is weakened, and the unwinding tension of the wound material 23 is adjusted substantially uniformly. Conversely, when the tension is weakened due to the fluctuation of the unwinding tension of the wound material 23, the tension arm 10 is tilted in the direction of arrow C1 with the support shaft 9 as a fulcrum axis, and the magnet holding member 8 becomes Is moved in the direction of arrow C2 with the fulcrum as a fulcrum axis, so that the position of the magnet 7 also moves from the center of the brake plate 6 toward the edge. As the position of the magnet 7 moves toward the edge, the braking force increases as the moment applied to the spindle shaft 2 increases, so that the release torque of the wound body 4 is increased and the tension is increased. The unwinding tension of the wound material 23 is adjusted substantially uniformly. The adjustment range of the unwinding tension of the wound material 23 can be easily changed by using brake plates having different diameters.

However, when the rotation speed of the brake plate 6 gradually increases as the winding diameter becomes smaller when the wound material 23 is unwound, a change occurs in the hysteresis phenomenon between the magnet 7 and the brake plate 6. Even if the position does not change, the braking force against the brake plate 6 gradually increases. Therefore, when extremely uniform adjustment of the unwinding tension of the wound material 23 is required, a device for adjusting the unwinding tension of the wound material 23 is required. It is desirable that a part be configured as shown in FIGS.

In FIGS. 3 and 4, reference numeral 24 denotes a lever swing displacement conversion unit, which includes a boss 112, a bush 14, a moving displacement imparting gear 15, swing levers 20a and 20b, transmission gears 16a and 16b, and the like. Have been. Next, the specific relationship between them will be described. The boss 112 is fitted with the brake plate 6, and is splined on its inner surface so as to be slidable with respect to the tip 2 a of the spindle 2. The movement displacement imparting gear 15 is provided on the boss 112 via a bearing 150 so as to be rotatable with respect to the spindle 2. The bush 14 is fixed to the spindle 2 at a distance from the boss 112, and is connected to the inner surface of the moving displacement imparting gear 15 by screwing. Stoppers 21a, 21b, 22a, 22b, locking members 18a, 18b, and support shafts 17a, 17b are fixed to the brake plate 6 in an upright position. The transmission gears are rotatably mounted on the support shafts 17a, 17b, respectively. 16a and 16b are fitted. Reference numerals 20a and 20b denote swinging levers. One end of each of the swinging levers 20a and 20b is fitted to the support shafts 17a and 17b, and the other end thereof is locked by a locking member 18a or 18b. , 19b. The transmission gears 16a and 16b are rotatably fitted to the support shafts 17a and 17b, respectively, and mesh with the movement displacement imparting gear 15. Each of the stoppers 21a, 21b and the stoppers 22a, 22b is erected at a position where the respective stopper is separated.

When the rotation speed of the brake plate 6 in the direction of arrow D gradually increases as the winding diameter becomes smaller when the wound material is unwound, the swing levers 20a and 20b become pivoted due to the increase in centrifugal force. Is gradually moved in the directions of arrows E1 and E2, respectively, and the movement displacement imparting gear 15 is rotated via the transmission gears 16a and 16b. When the moving displacement imparting gear 15 screwed to the bush 14 rotates, the displacement is converted into a displacement in the direction of arrow F, the brake plate 6 moves in the direction of arrow F, and the distance t between the magnet 7 and the brake plate 6 gradually increases. Therefore, the effect of the hysteresis phenomenon on the brake plate 6 is gradually reduced. As a result, a change in the rotation speed of the brake plate 6 does not cause a change in the hysteresis braking force of the magnet against the brake plate 6. The adjustment range of the interval t is a range until each of the swing levers 20a and 20b comes into contact with each of the stoppers 22a and 22b. The number of swing levers is not limited to two, and may be at least one. It is desirable that the distance between the magnet and the brake plate is about 5 mm at the maximum.

When the unwinding of the wound material is to be stopped, as shown in FIG. 1, the shaft 27 is raised by the action of a lifting means such as an air cylinder (not shown), so that the brake shoe 26 is raised. Comes into contact with the brake plate 6 to apply a brake. Conversely, when the unwinding is resumed, the brake shoe 26 is separated from the brake plate 6 by the pulling-back force of the coil spring 28 and the brake is released, if the lifting means is inactive.

[0012]

[Effect of the invention]

 The device for adjusting the unwinding tension of the wound material according to the present invention is inexpensive and easy to maintain because of its simple configuration, and the unwinding tension and the braking force can be reduced only by changing the size of the brake plate and the position of the stopper. The adjustment range can be changed freely, and there is no friction between the magnet and the brake plate, so the braking force does not decrease even when used for a long period of time. A suitable device that does not raise the temperature even when it is performed is obtained.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of a device for adjusting the unwinding tension of a wound product according to the present invention.

FIG. 2 is a cross-sectional view of the wound material unwinding tension adjusting device of FIG.

FIG. 3 is a side view of a peripheral portion of a brake plate in a case where a part of the unwinding tension adjusting device for wound material in FIG. 1 is another embodiment.

FIG. 4 is a cross-sectional view of the periphery of the brake plate of FIG. 3 cut along line X1-X2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Device frame 2 ... Spindle 4 ... Winding body 6 ... Brake plate 7 ... Magnet 8 ... Magnet holding member 9 ... Support shaft 10 ... Tension arm 11 ... Rolled material guide member 18a, 18b ... Locking member 19a, 19b ... Spring members 20a, 20b: swing lever 24: lever swing displacement converter 25: bearing

Claims (2)

[Utility model registration claims] An unwinding tension adjusting device for unwinding a linear wound material while rotating a wound body loaded on a spindle, wherein the wound body (4) can be rotated. A spindle (2) which is fitted into the device frame (1) and is rotatably inserted into the device frame (1); a conductive brake plate (6) which is fitted to the spindle (2); Things (23)
A magnet holding member (8) having a magnet (7) attached thereto so as to generate a braking force in a non-contact state with the brake plate (6) during unwinding, and a winding unwound from the winding body (4). A tension arm (10) partially provided with a roll guide member (11) for detecting an increase or decrease in unwinding tension of the roll (23); a bearing (1) provided on the device frame (1); The tension arm (10) and the magnet holding member (8) are swingably connected to the support shaft (9) using a support shaft (9) supported on the support shaft (25) as a fulcrum shaft. Magnet (7) according to a change in the unwinding tension of the wound material detected by the wound material guide member (11) when the material is unwound.
Wherein the unwinding tension of the wound material is adjusted by controlling the braking force by shifting the operating position of the wound material to the brake plate (6). 2. A spring member (19) locked by locking members (18a, 18b) provided on the brake plate (6).
a, 19b) and pivots (17a, 17b) fixed to the brake plate (6) are rotatably provided, and swingably locked to spring members (19a, 19b). The swing displacement of the moving levers (20a, 20b) and the swing levers (20a, 20b) when the wound material is unwound is changed to the displacement of the distance between the magnet (7) and the brake plate (6). 2. The unwinding of a wound material according to claim 1, comprising a lever swing displacement conversion section (24) provided so as to be capable of conversion and linked to the swing lever (20a, 20b). Tension adjustment device.