JPH08310725A - Bobbin carrier mandrel of accumulation unit for continuous fiber yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mandrel for performing complete high speed actuation with a simple structure by arranging an external tubular body having one end part connected to a driving means, a tubular element inserted into this and a block means for clamping a tube. SOLUTION: An actuator 12 is actuated, and a tubular element 6 is moved in the axial direction by a piston 9. This motion compresses a spiral spring 8. Since there is an inclined face 4, a block means 2 moves in the radial direction to be fitted to an external circumferential surface of a tubular body 3. A tube 5 is mounted along the tubular body 3 forming a load applying part of a bobbin carrier mandrel. While, mutually adjacent tubes 5 are clamped by de-energizing the actuator 12. That is, when the piston 9 retreats, the spring 8 allows the thrust action to move the tubular element 6 in the axial direction. Thus, the block means 2 projects in the radial direction from an outside surface of the tubular body 3 to clamp the tubes 5.

Description

Detailed Description of the Invention

The present invention relates to a bobbin carrier mandrel projecting from a high speed yarn collecting unit of a continuous fiber spinning plant. The projecting portion is in the form of a single load-bearing outer tubular body whose end is rigidly connected to the positive drive means.

Continuous fiber spinning plants for producing various synthetic fiber yarns are already known.

The yarn always emerges from the spinneret at various high speeds. Manufacturing process productivity and manufacturing facility efficiency have a significant impact on market competitiveness.

As a result, the industry is constantly seeking to have improved performance in machines and facilities at the lowest possible cost but with acceptable reliability. Performance improvement development research is directed to improvements in machine components and equipment in all respects.

This also includes improving the construction of the machine, ie giving it improved quality or greater technical content.

As is well known to those skilled in the art, in continuous fiber spinning plants, operational reliability and efficiency of the integrating unit are of considerable importance. The accumulating unit stores the yarn of the synthetic fiber, which comes out from the spinning protrusion at a high speed, around the bobbin and stores it for use in the next stage of the fabric manufacturing.

In addition to the mechanical base, drive unit, lubrication unit and control unit, a bracket-like support beam is a basic component of the integrated unit. This support beam carries a presser roller and a yarn traverse system, the presser roller itself and the mandrel
It carries a bobbin around which the yarn is wound.

In such a construction, the mandrel is most demanding. To do this job,
The mandrel must clamp the tubes of the bobbin around which the yarn is wound, rotate them at the required speed, and finally allow the bobbin to be removed.

The constraints imposed on mandrel design are their geometric shape and kinematic properties.

In order to achieve the aforementioned requirements, it must first be possible to mount the tube on a mandrel. The mandrel, which is a rotating member that supports the tube, rotates the tube at an appropriate peripheral speed. For this reason, the mandrel must have a free end.

The outer diameter of the mandrel is determined by the inner diameter of the tube. This tube is commercially available, preferably made of cardboard or plastic, and therefore does not have a high degree of dimensional precision. As the mandrel rotates at high speeds, dynamic vibrations occur in the mandrel, which jeopardize the life of the entire integrated unit.

Thus, the problem with mandrels lies in their mass, especially the inertial mass associated with dynamic vibrations.

In order to reduce the mass of this mandrel, the Applicant has improved the working principle both by using a different design to reduce the mass and by using a lightweight material. The mandrel described and claimed herein improves and streamlines the geometry of the integrated unit as well as improves the operating performance of the integrated unit and the operating life of the integrated unit has not previously been achieved. It has the amazing result of a long life.

The mandrels of the presently known collecting units operating in continuous fiber spinning plants provide unstable operating characteristics, especially at high yarn collecting speeds.
Also, such known mandrels have certain drawbacks that make them difficult to manufacture and assemble, which results in high manufacturing costs. These drawbacks mainly arise from the aspects described below. Use of high inertia mass materials. A large number of components used in the expansion system. Short bearing life due to substantial dynamic vibration. The cost of machining the mandrel and expansion system is high. The cost of assembly is high due to the complexity of the mandrel. Poor convenience for inspection and maintenance inside the mandrel. Low integration speed.

In view of these deficiencies associated with current mandrels, it is a first object of the present invention to provide an improved mandrel device according to the structural and operational aspects set forth below. Use of low inertia mass materials. To reduce dynamic vibration and therefore its influence, thus reducing wear. Reduce the cost of machining mandrels and expansion systems. Substantial reduction in assembly costs.
To facilitate inspection and maintenance of the inside of the mandrel. Increase the integration speed.

Accordingly, one object of the present invention is to provide a mandrel which has a simplified structure, complete operation, especially high speed operation, and better performance.

For this and other purposes, in a bobbin carrier mandrel projecting from a high speed yarn accumulating unit of a continuous fiber spinning plant, the projecting bobbin carrier part has one end rigidly connected to a positive drive means and a peripheral surface. A single outer tubular body having a plurality of holes evenly distributed over which the blocking means emerge to clamp the tubes one after another, for example a stack of steel and aluminum A body or a laminate of any other component, and also an outer tubular body of a lightweight composite material such as carbon fiber, which is inserted into the outer tubular body and is slidably bonded thereto and evenly distributed at even intervals. A plurality cooperating with the blocking means for the clamp emerging or retracting from the outer surface of the tubular body through the hole Axial in the tubular body over at least a length corresponding to the overall axial length of a plurality of tubes which bear a limited beveled area and which are mounted adjacent to each other and outwardly of the protruding mandrel. At least one tubular element extending in the direction of the winding, and a continuous yarn arranged to cooperate with the respective aperture and with the respective lower inclined surface and to be fed by the upper spinning protrusion. This is all accomplished by a bobbin carrier mandrel, characterized in that it comprises appropriately shaped blocking means for rigidly clamping the tube to be integral with said mandrel rotating at the required peripheral speed.

With respect to the above, the accompanying drawings illustrate a preferred embodiment. This embodiment does not constrain the mutual arrangement of components or the simplifications that follow.

In the accompanying drawings, members not related to the present invention,
For example, the bracket-like support beam carrying the drive unit, the presser roller and the yarn traversing system, as well as other parts, have been omitted. This is because these parts are known and not relevant to the present invention. In the figure,
The same member or a member having the same or similar function,
It is shown with the same reference numerals.

Reference numeral 1 denotes a shaft for driving a mandrel according to the known art, and reference numeral 2 clamps a tube 5 mounted one after another on a bobbin carrier mandrel,
An element or block means arranged to be movable in the radial direction such as to be removed from the clamp. Code 3
Is a single outer tubular body of the protruding portion of the bobbin carrier mandrel, which is a screw or similar means 10
It is fixed to the shaft 1 by. The tubular body 3 is preferably made of lightweight composite material or carbon fiber. Reference numeral 4 is an inclined surface provided in a limited area of the surface of the tubular element 6. The inclined surface 4 is provided for each hole provided in the tubular body 3. The respective holes and the inclined surfaces 4 cooperate with the blocking means 2 and are evenly distributed over the tubular body 3 and the tubular element 6 at a uniform distance. Reference numeral 7 indicates the contour of the bobbin being formed on the bobbin carrier mandrel of the integrated unit. This bobbin 7 is formed on the tube 5 clamped to the tubular body 3 by the blocking means 2. The blocking means 2 emerges from the outer surface of the tubular body 3 and is pressed against the inner surface of the tube 5.
Reference numeral 6 is a tubular element that is inserted into the tubular body 3 and is slidably connected to the tubular body 3. The limited sliding movement of this tubular element causes the piston 9 of the actuator 12, preferably of the aerodynamic type, to act on the end flange of the tubular element 6.
Is fulfilled by the operation of. This tubular element 6 overcomes the thrust of the spring 8 acting on the other end and moves.
Reference numeral 11 is a frame of a machine represented by an integrated unit.

The operation of the improved bobbin carrier mandrel of the present invention is easy to understand.

The operation of the bobbin carrier mandrel involves the following operating process. That is, the actuator 12
Is actuated to produce a slight but sufficient axial movement of the tubular element 6 by means of its piston 9. This movement compresses the spiral spring 8. Due to the presence of the beveled surface 4, the blocking means 2 move radially to substantially align with the outer circumferential surface of the tubular body 3.

The tube 5 is mounted by pulling it one after another along the tubular body 3 which forms the load bearing portion of the improved bobbin carrier mandrel of the present invention.
This tube 5 can be moved axially along the tubular body 3. This is because the blocking means 2 can move radially towards the inside of the tubular body 3. Therefore, it does not get in the way.

Deactivating actuator 12 clamps tubes 5 adjacent to each other. The actuator 12 allows the spring 8 to exert its thrust action by retracting its piston 9, moving the tubular element 6 axially. This causes the blocking means 2 to project radially from the outer surface of the tubular body 3 and
Clamp. Therefore, the tube 5 is fixed to the bobbin carrier mandrel, that is, the tubular body 3.

The collecting unit is operated in a known manner to wind the yarn onto the tube 5 rotating at a constant peripheral speed.

As is well known to those skilled in the art, moving (shaking) the yarn along the sides of the tube forms the bobbin 7 with the yarn wound to a predetermined final diameter. When the bobbin 7 reaches its predetermined diameter, the bobbin carrier mandrel ceases to rotate and is in the known operating process described below.

The actuator 12 is actuated and its piston 9 compresses the spring 8 and causes the tubular element 6 to move axially. Due to the presence of the inclined surface 4, the blocking means 2
Freely retracts and releases the tube 5 after winding the yarn.

The bobbin 7 is withdrawn from the bobbin carrier mandrel and a new empty tube 5 is mounted one after another on the tubular body 3 forming the load-bearing part of the improved bobbin carrier mandrel according to the invention. To do.

Then, the above-mentioned operation cycle is repeated.

It will be apparent to those skilled in the art to make modifications, variations and additions to the details of the improved bobbin carrier mandrel of the present invention without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is an axial cross-sectional view, partially in section, showing the base of a machine represented by a load-bearing outer tubular body, an inner tubular element and an integrated unit of a protruding portion.

FIG. 2 is an enlarged axial cross-sectional view of the protruding portion of the bobbin carrier mandrel showing the blocking means cooperating with the bore of the tubular body and the inclined surface of the inner tubular element.

[Explanation of symbols]

 1 Mandrel Drive Shaft (Drive Means) 2 Block Means 3 Tubular Body 4 Inclined Surface 5 Tube 6 Tubular Element 7 Bobbin 8 Spring 9 Piston 10 Screw 11 Frame 12 Actuator

Front Page Continuation (72) Inventor Alessandro Millri Imola, Bologna, Italy Italy Via Emilia Ponente 9

Claims (3)

[Claims] 1. A bobbin carrier mandrel projecting from a high speed yarn accumulating unit of a continuous fiber spinning plant, wherein the projecting bobbin carrier parts are rigidly connected at one end to a positive driving means and are regularly distributed over the peripheral surface. A single outer tubular body having a plurality of holes, through which the blocking means emerge to clamp a plurality of tubes one after another, and inserted into the outer tubular body and slidably coupled thereto. Carrying a plurality of restricted beveled regions cooperating with blocking means for the clamping emerging or retracting from the outer surface of the tubular body through the uniformly distributed holes, at least the Said tubular body over a length corresponding to the overall axial length of a plurality of tubes mounted next to each other on the outside of a projecting mandrel With at least one tubular element extending axially, each of which is arranged to co-operate with a respective bore and co-operate with a respective lower sloping surface of each, and is supplied by an upper spinning protrusion. A bobbin carrier mandrel comprising a suitably shaped blocking means for rigidly clamping the tube so as to be integral with the mandrel which rotates at the peripheral speed required to wind the yarn. 2. A bobbin carrier mandrel protruding from a high speed yarn accumulating unit of a continuous fiber spinning plant according to claim 1, wherein the outer tubular body is a carbon fiber. 3. A bobbin carrier mandrel projecting from a high speed yarn accumulating unit of a continuous fiber spinning plant according to claim 1, wherein the outer tubular body is, for example, a laminate of steel and aluminum or any other low inertia mass composite. A bobbin carrier mandrel which is a lightweight composite material such as a body.