SU1694724A1 - Device for cutting threads to size - Google Patents

Abstract

The invention relates to the processing of filaments and filamentary materials, in particular, devices for cutting filaments into sections and allows for increased reliability in operation due to unimpeded removal of filaments from the surface of the mandrel. The device is made in the form of a rotating hollow mandrel, made in the form of a cone, and provided with a spring-loaded knife, kinematically connected with an electromagnet and brake shoes. The knife is installed in the cavity of the mandrel with the possibility of reciprocating axial movement. The conical surface of the mandrel and the shoes have longitudinal slits for the passage of the cutting edges of the knife. 2 Il.

Description

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The invention relates to the processing of filaments and filamentous materials, namely, cutting into segments of a given length, and can be used in the chemical fiber industry, textile, light and other industries.

The purpose of the invention is to increase reliability in operation due to the unimpeded removal of the thread segments from the mandrel surface.

Figure 1 shows the device, a general view; figure 2 - section aa in figure 1.

The device comprises a hollow mandrel 1 mounted in bearings 2 for rotation. In the longitudinal slots of the conical section of the mandrel there is a flat knife 3 fixed at the end of the rod 4, at the second end of which the measles 5 of the electromagnet 6 is mounted.

On the side of the larger base of the mandrel taper, the drive pulley 7 is rigidly fixed, and on the cylindrical portion of the mandrel there is a housing 8, in which two levers 9 are mounted on the axles, carrying brake shoes 10. The levers are equipped with counterweights 11.

The shoes 10 have slots through which the flat knife 3 passes. In the area of the larger base of the mandrel cone, a thread guide 12 is installed. The flat knife is under the action of the spring 13.

The device works as follows.

The threads are wound up from the spool spools of the stalk, pass through the resident nitenate (not shown), pass through the thread guide 12, and are wound onto the conical surface of the rotating mandrel 1.

Under the action of tension, the threads of the thread are staggered in the direction of the small base ON O VB

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The tapers of the mandrel are clamped between the tapered surface and the shoes 10, which are pressed against the centrifugal forces created by the counterweights 11 as they rotate.

When changing the direction of the current in the coil of the electromagnet 6 and under the action of the spring 13, the measles 5 of the electromagnet and, accordingly, the flat knife 3 perform a reciprocating axial movement (stroke mm), ensuring the cutting of the threads of the thread into segments. Under the action of centrifugal forces arising from the rotation of the mandrel, the resulting segments of the thread are thrown in different directions (the device is placed inside a closed casing).

Changing the length of the thread segment is carried out in the axial direction of the flat knife, the electromagnet and the body with the shoes relative to the mandrel. A change in the length of the thread is achieved by cutting its turns on different diameters of the mandrel.

The change in the force of pressing the shoes to the surface of the mandrel is made by changing the position of the counterweights on the shoes.

Claims (1)

Invention Formula A device for cutting yarns into segments, comprising a flat knife with a drive, a hollow mandrel consisting of conical and cylindrical sections and having longitudinal slots for passing the cutting edges of the knife, a thread guide for feeding the yarn to the conical section of the mandrel and means for holding the threads of the yarn on the mandrel in two brake shoes mounted on the bearing arms diametrically relative to the mandrel with the possibility of contact with its outer surface, characterized in that, in order to increase reliability in operation due to unimpeded removal of thread segments from the surface of the mandrel, the latter has a drive for its rotation and slots are made on the conical section of the mandrel, while the knife is placed in the cavity of the conical section with the possibility of reciprocating axial movement, and the brake shoes are mounted on the cylindrical section of the mandrel with the possibility of contact with its conical surface and have slots for the passage of the cutting edges of the knife. // Aa Thebes. 2 J W