JPH06200427A - Top apron cradle - Google Patents

Abstract

(57) [Summary] [Purpose] It is an object of the present invention to provide a top apron cradle capable of maintaining a constant tensor gap. In a top apron cradle for a drafting machine of a spinning machine, which has an apron guide attached to a central member of the top apron cradle to tension and guide the top apron by the force of a spring, an apron guide (2) having an axis (8) is provided. ) Is the central member (1)
It is accurately guided in the groove (9) formed in the.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drafting device for a spinning machine equipped with an apron guide adapted to tension and guide a top apron by the force of a spring and to be attached to a central member of the top apron cradle. About the Top Apron Cradle.

[0002]

2. Description of the Related Art A top apron cradle is a spinning machine having a supporting and loading device for a double top roller which can be lifted from a bottom roller provided at a fixed position as disclosed in German Patent Publication DE-PS22557961. Used for the draft device. The top apron, which faces the bottom apron running around the driven bottom roller and nose bar, runs around the top roller and the top apron cradle with guide nose.

[0003] CH-PS494831 discloses a top apron cradle in which an apron guide held by a central member of the top apron cradle tensions the top apron by the force of a spring. The apron guide has a U-shaped cross section. The spring is housed inside a shank surrounding the central member. The bottom of the shank is formed with a slot in which a pin provided in the central member engages, and guides a sliding apron guide.

[0004]

However, the guidance of the apron guide is not sufficiently accurate, which has an adverse effect on the running motion of the top apron. There may be play between the apron guide and the central part enclosed thereby, causing the apron guide to tilt and the tensor gap adjusted by the lateral projections on the central part is not maintained at a constant value.

It is an object of the present invention to solve the above problems in running a top apron and to provide a top apron cradle capable of maintaining an adjusted tensor gap at a constant value.

[0006]

According to the present invention, the above object is to provide a spinning machine having an apron guide attached to the central member of the top apron cradle for tensioning and guiding the top apron by the force of the spring. In a top apron cradle for a drafting device, this is achieved by the apron guide with the shaft being precisely guided in a groove formed in the central member.

Precise guidance by the shaft in the groove prevents tilting of the apron guide.

According to the second aspect, if the cross section of the shaft and the groove is rectangular, the top apron cradle can be manufactured with high precision by injection molding.

According to the third aspect of the present invention, the top apron cradle is prevented from falling off when the top apron is removed if the shaft has the locking protrusions that engage with the groove recesses.

Furthermore, if the apron guide and the central member are engaged with each other to form a cylindrical groove for guiding the spring in the form of a coil spring according to claim 5, the top apron is provided. The spring for tensioning gains the advantage of being protected from accumulated floating fibers.

Furthermore, according to claim 7, even if the top apron cradle remains in the spinning machine, the top apron can be replaced. If the central member and apron guide are pushed together against the force of the spring, the top apron cradle is released from tension and lifted above the outward projecting guide nose. The upper guide nose pointing towards the central member provides a positive contact surface when the new top apron is put in place.

[0012]

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

The top apron cradle has a central member 1 and two apron guides 2. The central member 1 is supported by the shaft 3 of the double top roller 4. The double top roller 4 is of a normal type and is supported by a guide arm of a support / load arm (not shown). The apron guide 2 cooperates with two rotatable top rollers 4.

The top apron 5 runs around the top roller 4 and the apron guide 2, and is loaded by a spring 6 movably connected to the central member 1 and supported by the central member 1. I am nervous. A central member 1 and an apron 2 are provided for accommodating the spring 6 in such a way that it protects it from stray fibers.
A cylindrical groove 7 that engages with each other is formed in the mold.

The apron guide 2 has a rectangular shaft 8 which engages a corresponding groove 9 in the central member 1. Since the central member 1 and the apron guide 2 are made as plastic injection-molded parts, the guide of the shaft 8 in the groove 9 is accurately performed, and the inclination of the apron guide 2 can be reliably prevented.
The adjusted tensor gap, i.e. the distance between the top apron 5 and the bottom apron (not shown) in which the fiber material emerges from the double apron device, is kept constant.

A locking projection 10 is formed integrally with the pin 8, which locking projection 10 engages in a corresponding recess of the groove 9. This prevents the top apron cradle from falling off when the top apron 5 is removed.

The lateral movement of the top apron 5 is effected by the guide nose 11, 1 formed on the apron guide 2 by molding.
Regulated by 2. Guide nose 1 that projects outward
1 is located at a low position so that when replacement is required, the top apron 5 can be lifted sideways by lightly pushing the apron guide 2 and the central member 1 against the force of the spring 6. Has become. The top apron cradle does not have to be removed from the device.

When a new top apron 5 is slipped in,
The guide nose 12 at a fairly high position functions as a stopper to bring the top apron to a correct position.

Since the spring 6 is in the form of a coil spring, it has a flat characteristic curve. Thus, small differences in the length of the top apron 5 are compensated.
The guide surface of the pin 8 in the groove 9 is correspondingly long.

When using a top apron cradle in a drafting device for medium length fibers, a long apron guide 2 corresponding to this with a long body is inserted into the same medium size central member 1. It will be possible. The top apron 5 is thus applicable to various draft lengths.

[Brief description of drawings]

FIG. 1 is a front view of a top apron cradle as an apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA when a top roller and a top apron are installed in the device shown in FIG.

FIG. 3 is a sectional view taken along line BB in FIG. 1 for showing the guide of the apron guide.

[Explanation of symbols]

 1 Central member 2 Apron guide 5 Top apron 6 Spring 8 Shaft 9 Groove 11 Guide nose 12 Guide nose

Front Page Continuation (72) Inventor Franz Fuchs, Federal Republic of Germany, 71106 Markstadt, Im Baesesemle 7

Claims (7)

[Claims] 1. A top apron cradle for a drafting device of a spinning machine, comprising an apron guide mounted on the central member of the top apron cradle for tensioning and guiding the top apron by the force of a spring, the apron guide having an axis (8). (2) is the central member (1)
A top apron cradle characterized by being accurately guided in a groove (9) formed in the. 2. Top apron cradle according to claim 1, characterized in that the shaft (8) and the groove (9) have a rectangular cross section. 3. The shaft (8) has a locking projection (10) which engages in the recess of the groove (9).
Alternatively, the top apron cradle according to claim 2. 4. The spring (6) is formed to have a flat characteristic curve, and the guide surface of the shaft (8) in the groove (9) allows mounting of top aprons (5) of various lengths. A top apron cradle according to any one of claims 1 to 3 which is of sufficient length to operate. 5. An apron guide (2) and a central member (1)
Top apron cradle according to one of claims 1 to 4, characterized in that they engage each other to form a tubular groove for guiding the spring (6) in the form of a coil spring. . 6. An apron guide (2) of various draft lengths
The first member can be mounted on the central member.
A top apron cradle according to claim 5. 7. A guide nose having a guide nose (11; 12) formed in the apron guide (2) by molding so as to restrict lateral movement of the top apron (5), the guide nose (12) projecting outward. 7. The top apron cradle according to claim 1, wherein the top apron cradle is located higher than the (11) and is formed toward the central member (1).