SU852590A2 - Method of preparing blanks for pressing fabric-base laminate articles - Google Patents

Description

one

The invention relates to the manufacture of blanks for pressing textolite products.

The known method according to ed. swith No. 320385 for the manufacture of blanks for pressing textolite products, which means that the tape material is wound on a cylindrical mandrel and the end of the tape is fixed by feeding into the gap between the workpiece and the tape yarn and cut it after several turns of the wound workpiece 1.

The disadvantage of this method is that when used for fastening bobbin threads or threads in bobbins with some elasticity, the end of the thread is sometimes not caught by the rotating workpiece, i.e. it is not pressed by the incident tape of material. This is because the beginning of the thread spontaneously twists, resembling the end of a spiral spring. Such a thread is not caught when it is fed into the gap between the rotating workpiece and the incoming tape.

This leads to the fact that the tape of material wound on the mandrel appears to be unwound with a thread and is unwound. This piece of tape is subsequently wound by hand or goes to waste, recycling

which is laborious, which ultimately reduces the productivity in the manufacture of blanks.

The purpose of the invention is to increase the reliability of capturing the beginning of the thread by the winding workpiece.

The goal is achieved due to the fact that in the method of making blanks for pressing plastic products by winding

10 tapes on the mandrel with subsequent fixing of its end by inserting the end of the thread during winding into the gap between the workpiece and tape, cutting it after several revolutions of the wound blank, and inserting the beginning of the thread into the gap between the workpiece and the tape through a longitudinal section rolling branch of tape from the outside of her side.

FIG. 1 shows the reel before starting the filing of the thread; in fig. 2 - the time of the longitudinal slit on the tape; in fig. 3 - the moment of exit of the feeder thread from the cut longitudinal section; in fig. 4 - Moment of winding the blanks with thread.

The blanks of the proposed method are manufactured as follows.

The tape, pre-cut from the rolled material and wound on the frame, is mounted on the machine.

During the winding of the workpiece 1, the knife 2 with a hole in it, through which the thread 3 is missed, is fed to the incoming branch of the belt 4 from its outer side for applying a longitudinal slot. At the same time, the beginning of the thread 3, which is gripped by the rotating blank 1 and the advancing branch of this tape, hangs from the opening. The beginning of the thread, regardless of its elasticity, is securely gripped and pressed against the tape. From this moment on, the tape is wound with the thread.

After passing the tape of a certain length, which is fixed by an appropriate mechanism, the tape is cut, while it continues to be wound together with the thread. The thread tension is such that it presses the end of the tape, overcoming its elasticity. After several turns of the yarn have been obtained around the workpiece, the thread is cut on the fly after several turns around the workpiece. The workpiece is wrapped with several threads.

When processing workpieces is connected with spilling them from one container to another, to prevent unwinding, the end of the thread must be glued or pressed with a roller, the axis of which

intersects with the axis of rotation of the workpiece, with the result that the coils are shifted and the end of the thread is under them. To better fasten the end of its thread

smear with melted paraffin, which almost instantly hardens, keeping the thread from unwinding. At the same time, paraffin wax is a mold release when processing the preform.

This method improves the reliability of fastening the wound blank to the mandrel, which is its waste.

Claims (1)

Invention Formula A method of manufacturing a blank for pressing textolite products according to USSR author's certificate No. 320385, characterized in that, in order to increase the availability of capturing the beginning of the thread with the winding workpiece, the introduction of the beginning of the thread into the gap between the workpiece and the tape is performed through a longitudinal section on the incident branch of the tape with the outer her side. Information sources, taken into account during the examination 1. USSR author's certificate No. 320385, cl. In 29В 1/02, 1971 (prototype).