JPH03185145A - Braking device of rotator - Google Patents

Abstract

PURPOSE:To stretch a brake belt suspended between a pulley and a brake drum and to control a rotator by frictional force by pressing a lever in a direction opposite to the pulley by a forcing means. CONSTITUTION:A lever 27 is pressed in a direction opposite to a pulley 25 by a forcing means 33 to stretch a brake belt 30 suspended between the pulley and a brake drum 29 and to control a rotator mainly by frictional force between the brake belt and the brake drum. By making action position of the forcing means in the lever adjustable, braking force is finely controlled without changing load of the forcing means.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a braking device suitable for braking a warp beam used in a weaving process, for example.

[Prior Art] In the warp preparation step, which is one step in the weaving process, as shown in FIG. 3, a plurality of warping beams 1. A creel 2, a pasting machine 3, a cylinder roller for drying 4.・・・
・ etc. are provided, and the warping beam 1 . A large number of warp threads are unwound from 6.
. . is passed through a glue tank 3a of a glue applicator to be glued, dried, and then wound onto a loom beam 7. The warp beam 1 has warp threads 6.・・・
In order to adjust the tension of the beam, a braking device is provided to brake the rotation of the beam, and there are two conventional methods for this braking device.

One is a collective braking system in which all the warping beams l, . In the illustrated example, the brake pulley 10.0 of each warping beam. Brake bells) 11 are applied alternately to the brake pulley 10 and the brake bells) 11, one end of which is fixed to a fixed point 12, and the other end pulled by a biasing means such as a weight or air cylinder 13. It is designed to provide braking using the frictional force of the In this method, the braking force of each warping beam is equalized, so if beams with different warp winding amounts and different warp payout radii are used at the same time,
The problem was that the tension of each warp yarn varied, making it unsuitable for factories that handle a wide variety of products and small lots.

The other one, as shown in Fig. 6, is a brake belt 1 that is applied independently to each brake pulley 10 of each warping beam.
This is an independent braking method in which each warping beam is braked individually by tensioning the warping beam with a wire (way) 16 or the like. According to this method, since the braking force of each warping beam can be adjusted individually, there is an advantage that beams with different warp winding amounts can be used at the same time.

[Problems to be Solved by the Invention] However, in the conventional independent braking system described above, the brake pulley lO is directly braked by the brake belt 15, so that the warp threads 6. ... is easily subjected to excessive tension or shock, and warp threads 6. There was a risk that it would break. In addition, since the tension of the brake belt 15 was adjusted in stages using a plurality of weights 16 of different weights, the range of tension variation in each stage of adjustment was large, as shown in B in Fig. 4, resulting in fine adjustment of the braking force. was difficult.

Furthermore, in this type of device, the beam is likely to overrun when starting and stopping, so to prevent this, it is preferable to have a relatively large braking force during low-speed operation, and during steady operation, it is preferable to use a relatively large braking force. As the winding diameter decreases, the tension gradually increases, so in order to prevent yarn breakage and agitation, it is preferable to reduce the braking force as the winding diameter decreases.
In the conventional braking device described above, such adjustment of the braking force was not possible unless the operator took special effort to adjust the weight of the weight.

Therefore, it is an object of the present invention to solve the problems of the above-mentioned conventional methods.

[Means for Solving the Problems] In order to achieve the above problems, the present invention has the following configuration.

That is, the braking device for a rotating body according to the present invention includes a pulley that has a common rotation center axis with the rotation body and rotates together with the rotation body, and a pulley that is swingable in a plane perpendicular to the rotation center axis. The brake drum includes a brake drum non-rotatably attached to a lever, an endless brake belt placed between the pulleys and the brake drum, and biasing means for biasing the lever in a direction opposite to the pulley.

[Operation] By biasing the lever in the opposite direction to the pulley using the biasing means, the brake belt placed between the pulley and the brake drum is tensioned, and the frictional force between the brake belt and the brake drum is mainly reduced. The rotating body is braked. If the operating position of the biasing means on the lever can be adjusted, the braking force can be finely adjusted without changing the load of the biasing means.

The lever is swingable in a plane perpendicular to the pulley's rotation center axis, so when the rotational speed of the rotating body increases, the brake belt bulges outward and the brake drum is pulled toward the pulley, causing the brake to tighten. Since the belt bulges outward, the length of the sliding contact between the brake belt and the brake drum is reduced, and the frictional force is reduced. Therefore, during steady operation, the braking force is smaller than when starting or stopping. Note that the brake belt bulges out greatly on the feed side (the side facing the brake drum from the pulley).

Furthermore, if an impact force is applied to the string for some reason during operation, the lever automatically swings toward the pulley to temporarily reduce the braking force, so that the impact force is softened.

[Embodiment] FIG. 1 shows a braking device for a warp beam according to an embodiment of the present invention.A warp beam l, which is a zero-rotation body, is formed between a pair of flanges 20 and 20. Winding part 21
6. Multiple warp threads. ... is rolled up, and a central shaft 22 projecting horizontally from both flanges 20, 20 is rotatably supported by a bearing (not shown). Braking device A
A pulley 25 is attached to the outer surface of one flange 20 with its axis aligned with the central axis 22, and a lever 27 is provided below the pulley 25 so as to be able to swing up and down about a fulcrum 26. Brake drum 2 in the middle part
9 is attached in a non-rotatable manner, and an endless brake bell 30 is hung between the pulley 25 and the brake drum 29. The diameter DI of the pulley 25 is difficult to change since the installation of the winder's warping beam is limited by the diameter of the chuck, but the diameter D2 of the brake drum 29 can be set arbitrarily. In reality, it is preferable to set D2 < am, for example, DI = 214φ and D2 = 70φ.The brake belt 30 is a belt-shaped belt made of leather, mended material, rubber, etc. and having an appropriate coefficient of friction. It is a belt. A plurality of grooves 32 are formed at predetermined intervals on the tip side of the upper surface of the lever 27, and a weight 33 of an appropriate weight can be suspended by being locked to any one of these grooves. It looks like this. The weight 33 is a biasing device that biases the lever 27 in the opposite direction to the pulley 25, that is, downwardly, and other biasing devices such as a spring may be used as the biasing device.

When the operation of the warp preparation process shown in Fig. 3 above is started,
Each warping beam 1.・・・Warp thread 6. ... is being fed out, but at this time, the warping beam l is moved by the braking device A.
A rotational braking force is applied to the warp threads 6. The tension of... is kept constant. This rotational braking force is mainly due to the frictional force between the brake drum 29 and the brake belt 30, and depends on the drum diameter D2 and the brake belt tension T.
, the coefficient of dynamic friction between the drum and the brake belt, etc.

Since < DI > 02 as described above, the pulley 25
The frictional force between the brake belt 27 and the brake drum 2
9 and the brake belt 27, the movement of the brake belt 27 is controlled by the pulley 25, and the brake belt 27 and the brake drum 29 continue to slip at their sliding contact portions. The dynamic frictional resistance at this time becomes a braking force for the warping beam 1. brake belt 3
The tension T of 0 correlates with the force F that pulls down the brake drum 29, and when the distance from the fulcrum 26 to the brake drum is R1, the distance from the fulcrum 26 to the weight 33 is L, and the weight of the weight 33 is W, then F = (R/L)W.

The first advantage of this braking device iA is that it is easy to finely adjust the braking force. To adjust the braking force, you can either change the hanging position of the weight 33 to change the distance, or change the weight W of the weight 33. By appropriately combining the two, you can adjust the braking force to a small extent with a small range of variation. Adjustments can be made. Figure 4 shows the case when conventional braking device B is used and this braking device! This is a diagram showing the warp tension when using tA, where tl indicates the minimum tension value at which the warp wound on the warping beam does not loosen, and tl indicates the maximum tension value at which the weakest part of the warp does not break. ing. Since the conventional braking device B has a large fluctuation range in warp tension per stage, it is only possible to roughly adjust the warp tension t close to a desired value. On the other hand, in the braking device A of the present invention, since the fluctuation range of the warp tension t is small, the type of warp used,
The warp tension can be adjusted to the optimum warp tension depending on the yarn count, etc.

The second advantage is that the buffering effect is large. Belt relief is provided at two locations between the brake belt 30 and the brake drum 29 and between the brake belt 30 and the pulley 25, and the lever 27 can swing in the opposite direction against the load of the weight 33. If a large load is applied, it is absorbed by these parts, thus preventing warp threads from breaking due to accidental tension fluctuations.

A third advantage is that the braking force automatically decreases as the rotational speed of the warping beam 1, which is a rotating body, increases. FIG. 2 is an explanatory diagram of this. At low speeds, the brake belt 30 is tensioned almost evenly as shown in FIG. Since the brake drum 29 expands downstream, the contact area between the brake drum 29 and the brake belt 30 becomes smaller, and the braking force decreases. Tables 1 and 2 show the experimental results of measuring warp tension at low speed and high speed. These are the experimental results for the device 51A. With conventional weights, even if the weights are the same,
As the rotational speed increased due to the decrease in the winding diameter, the warp tension increased, making warp breakage more likely. On the other hand, in the fabric of the present invention, as the yarn speed increases, the warp tension decreases and warp breakage is less likely to occur.

Table 1 (Blank below) [Effects of the Invention] As is clear from the above description, the braking device for a rotating body according to the present invention can easily obtain a preferable braking force depending on the rotational speed, and It has an excellent buffering effect during load fluctuations, and also allows fine adjustment of the braking force, making it highly effective in practical applications, for example, in processes such as spinning and weaving.

[Brief explanation of drawings]

FIG. 1 is a perspective view of one embodiment of a braking device according to the present invention;
Figures 2 (a) and (b) are front views showing different conditions, Figure 3 is an explanatory diagram of the warp preparation process during the weaving process, and Figure 4 shows the relationship between load and warp tension. 5 is an explanatory diagram of the collective braking system, and FIG. 6 is an explanatory diagram of the individual braking system. DESCRIPTION OF SYMBOLS 1... Warp beam, 6... Warp, 22... Center shaft, 25... Pulley, 26... Fulcrum, 27... Lever, 29... Brake drum, 30... Brake belt, 33... weight (biasing means). Figure 5 Figure 6

Claims (1)

[Claims] (1) A pulley that has a common rotation center axis with the rotating body and rotates together with the rotating body, and a brake that is non-rotatably attached to a lever that can freely swing in a plane perpendicular to the rotation center axis. A braking device for a rotary body, comprising a drum, an endless brake belt stretched between the pulleys and the brake drum, and biasing means for biasing the lever in a direction opposite to the pulley.