JPH0227449B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotating ring for spinning, and particularly to a so-called negative rotating ring in which a ring rotating body rotates due to the rotation of a traveler.

[Conventional technology and its problems]

Conventionally, a passive rotating ring for spinning, which has a ring rotating body rotatably supported by a holder via a bearing part, and is configured to be rotated by the rotational force of a traveler, has been specially developed. This method is known from Publication No. 15934/1983.

In this conventional rotating ring, when the machine is stopped, the ring rotating body descends as the spindle rotation suddenly decreases, and at the same time, the dust cover contacts the holder and stops the rotation of the ring rotating body. It has an effect. However, due to thick spinning and high speed spinning, it receives high torque (high PV value),
When the ring rotating body rotates at a high speed of 6,000 to 7,000 RPM or more, the tip of the dust cover opens horizontally and is completely released from the top of the holder.
In addition, the bearing part becomes an air bearing, and the frictional resistance approaches zero, and the rotation of the ring is accelerated by the torque of the traveler, drawing a J curve in a very short time and rotating up to approximately the same speed as the traveler.

Therefore, even if the spindle stops due to the stoppage of the machine, the tip of the dust cover does not immediately descend into contact with the upper end of the holder, and the ring rotating body continues to rotate in inertia for a while due to the moment of inertia. There was a problem that a snarl occurred due to the unwinding phenomenon, and this snarl caused the thread to break when restarting.

In order to prevent this, the spindle rotation is gradually lowered, the spinning tension and the torque of the traveler are relaxed, and the machine is stopped after waiting for the rotational speed of the ring rotating body to decrease, which takes time and effort. It was inconvenient.

In addition, when the rotational speed of the ring rotating body increases in proportion to the spindle and becomes the same speed as the traveler, the spinning tension control effect unique to the passive rotating ring by absorbing and converting spinning tension fluctuations into rotational torque is lost, and its inertia This makes it impossible to absorb spinning tension fluctuations, and spinning repeats severe tension fluctuations as the winding speed changes, which can lead to fuzzing, wrinkles, and other deterioration of yarn quality depending on the fiber type. It was hot.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention aims to prevent excessively high-speed rotation that occurs when the bearing portion of a ring rotating body becomes an air bearing and the frictional resistance approaches zero.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a rotating ring for spinning comprising a holder and a ring rotating body rotatably supported by the holder via a shaft bearing. The lower end portion is provided with a brake shoe made of an elastic body, which opens outward and downward and faces the lower end surface of the holder in a non-contact manner.

[Effect]

As the ring rotating body rotates, the brake shoe also rotates, and the centrifugal force caused by this rotation deforms the brake shoe. When the rotational speed reaches a certain speed, the brake shoe deformed by centrifugal force comes into contact with the lower end surface of the holder, and the contact pressure exerts a force that pulls down the ring rotating body, and as a result,
A braking force due to friction is generated at the contact surface between the bearing and the brake shoe, thereby preventing the ring rotating body from rotating at an excessively high speed.

When the rotational speed of the ring rotating body is low, the brake shoe does not contact the holder and therefore no braking force is generated.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, the ring rotating body 1 is a traveler 1
A lower rotor 1b is press-fitted into a flange rotor 1a which can be slid and rotated, and is rotatably supported via a shaft bearing part A by a holder 2 made of a wear-resistant oil-containing material or resin. There is.
Gaps a1 and a2 can be formed between the holder 2 and the ring rotating body 1 in the bearing part A, and when going diagonally outward in the upper and lower directions from the bearing part A, the gaps a1 and a2 are slightly larger than the gaps a1 and a2. Wide gaps b1 and b2 for dust removal are formed. Note that 8 is a stop ring and 9 is a ring rail.

An annular dust cover 3 made of synthetic rubber, synthetic resin, etc. is attached to the upper outer edge of the ring rotating body 1. On the upper surface of the dust cover 3, a large number of oblique blades 5 which receive air resistance during rotation are mounted. It is attached. Further, a large number of diagonal grooves 3a are formed on the inner circumferential surface of the dust cover 3 to generate an outward air flow as the dust cover 3 rotates.
Note that 4 is a metal ring for fixing the dust cover 3.

The oblique blades 5 attached to the dust cover 3 push the ring rotor 1 downward by the vertical component of air resistance caused by the rotation of the ring rotor 1, bring the bearings A into contact, and generate friction pressure. Further, the tip of the dust cover 3 is brought into contact with the upper end surface of the holder 2 to generate a frictional force, thereby preventing the ring rotating body 1 from rotating at an abnormally high speed. Further, the horizontal force that the oblique blade 5 receives due to the rotation of the ring rotor 1 acts as a direct air resistance that increases according to the rotation speed of the ring rotor 1, and suppresses the rotation of the ring rotor 1. It becomes a brake that does.

At the lower end of the ring rotating body 1, there is a substantially L-shaped brake ring 6 made of a soft elastic material such as synthetic rubber or synthetic resin and having a metal ring 7 inserted into its inner core.
is attached integrally with the ring rotating body 1.

A brake shoe 6a that opens outward and downward is formed at the tip of the brake ring 6, that is, at the outer periphery.A brake shoe 6a that opens outward and downward is formed on the upper surface of the brake shoe 6a in a radial direction to increase frictional resistance at the time of contact. A large number of knurled grooves are provided on the surface. In the free state when the ring rotating body 1 is stationary, the brake shoe 6a is in a non-contact state with an appropriate gap between it and the lower end surface of the holder 2, but when rotating, the brake shoe 6a is in a non-contact state. The circumferential edge expands against its elasticity due to centrifugal force, deforms upward to become horizontal using the bent portion connected to the brake ring 6 as a fulcrum, and gradually lifts from the state shown by the solid line to the state shown by the chain line in the figure. When the rotational speed of the ring rotating body 1 exceeds a certain value (for example, 5000 RPM), the brake shoe 6a comes into contact with the lower end surface of the holder 2, and the contact pressure exerts a force to pull down the ring rotating body 1. A braking force is generated due to friction at the contact surface between the bearing portion A, the brake shoe 6a, and the holder 2. With this, the bearing part A
This prevents the ring rotating body 1 from increasing in speed excessively due to the rotation becoming an air bearing.

As a result, the spinning tension control effect, which is the most important feature of the passive rotating ring, is not impaired, and the occurrence of fuzz, wrinkles, and other deterioration in yarn quality can be prevented. By preventing the ring rotating body 1 from rotating at an excessively high speed, inertial rotation due to its inertia is suppressed, and as a result, when the machine is stopped, the rotation of the ring rotating body 1 is stopped before the spindle stops. is stopped, and the occurrence of snarl due to overrun of the ring rotating body 1 is prevented.

Further, the gap between the ring rotating body 1 and the holder 2 opens obliquely outward, and the inner gap a
Since the outer gaps b1 and b2 are wider than the outer gaps b1 and a2, the centrifugal force caused by the rotation of the ring rotating body 1 and the outward airflow caused by the diagonal grooves 3a are effective against fly fluff and fine dust. This prevents air dust from accumulating and staying in the bearing portion A, and prevents rotation of the ring rotating body 1 from being inhibited.

Note that it is possible to make various changes in the shape, structure, dimensions, material, hardness, weight, etc. of each part of the above-described embodiments without departing from the gist of the present invention.

〔Effect of the invention〕

According to the present invention, the brake shoe is deformed by the centrifugal force caused by the rotation of the ring rotating body, and the brake shoe contacts the lower end surface of the holder and pulls down the ring rotating body, thereby causing the shaft bearing and the brake shoe to deform. A braking force is generated at the contact surface of the Y, preventing the ring rotating body from rotating at an excessively high speed.

This makes it possible to suppress the rotation of the ring rotating body within a range that maintains the spinning tension control effect, which is the most important feature of the passive rotating ring. can be prevented from occurring.

This spinning tension control action reduces the range of tension fluctuations and has the effect of maintaining so-called constant tension, making it possible to significantly increase the rotational speed of the spindle, thereby improving productivity.

[Brief explanation of drawings]

The drawing is a front sectional view showing an embodiment of the spinning ring of the present invention. 1...Ring rotating body, 2...Holder, 3...
Dust cover, 6...brake ring, 6a...brake shoe, A...shaft bearing part.

Claims (1)

[Scope of Claims] 1. A rotating ring for spinning comprising a holder and a ring rotating body rotatably supported by the holder via a shaft bearing, the lower end of the ring rotating body including: A rotating ring for spinning, characterized in that it is made of an elastic body and is provided with a brake shoe that opens outward and downward and faces the lower end surface of the holder in a non-contact manner.