Winding – tensioning – or guiding – Tension control or brake – Supply controlled
Patent
1996-10-02
1999-05-25
Stryjewski, William
Winding, tensioning, or guiding
Tension control or brake
Supply controlled
242417, 2424191, B65H 23188, B65H 5920
Patent
active
059063300
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention is related to a thread feeding buffer for feeding a fibre thread from a magazine roll to a feed apparatus at a robot arm which is freely movable in the room.
BACKGROUND OF THE INVENTION
The production of fibre reinforced thermosetting plastic products can be automatized by the use of an industrial robot, by means of which a fibre feed apparatus can be controlled, so that precise amounts of fibres are fed out which are oriented for maximum strength, without the fibres projecting out through the outer plastic layer of the product.
Owing to the repeatability of the robot, the quality of these products can be increased considerably, simultaneously as problems related to bad work environment and labour fatigue can be solved.
The fibre feeding apparatus is preferably located in a feedout head which can be mounted upon a movable robot arm. One or more fibre threads are supplied to the feedout head, which cuts the threads in suitable lengths. The feeding speed of the fibre thread can be in the range of about 10 meters per second.
At such a feeding speed, it is difficult to stop the feeding of thread without any risk of getting they thread tangled.
THE TECHNICAL PROBLEM
The object of the invention is therefore to provide a thread feeding buffer which solves the above described problems.
THE SOLUTION
For this object, the invention is characterized by thread brake means and at least one movable thread guide on which a thrust force is acting, and that the thread is running from the magazine roll, via the brake means, through the thread guide and further on towards the feed apparatus in such a way, that the thrust force acts for creation of a thread buffer between the brake means and the feed apparatus, which buffer is variable in length .
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in the following, with reference to an embodiment which is shown schematically on the accompanying drawing, in which
FIG. 1 is a plane view of a thread feeding buffer according to the invention, and
FIG. 2 shows the thread feeding buffer in FIG. 1 in a side view.
DESCRIPTION OF PREFERRED EMBODIMENTS
The thread feeding buffer according to the drawing comprises a stand 10 with two vertical guide rods 11. The stand 10 carries an elbow arm 12 with a thread eyelet 13 for a thread 15 which is wound off from a roll 14. The thread can consist of a multiple fibre thread of glass, carbon fibre or synthetic fibre. The thread eyelet 13 provides for a substantially friction free passage of the thread.
The thread runs upwards from the roll 14 which is located at ground level, through the thread eyelet 13 and further over a bar 16 which changes the direction of pull back vertically down between the guide rods 11. A thread guide 17 is movably guided by the guide rods and is provided with further thread eyelets 13, through which the thread 15 runs. Then the thread runs on from the thread guide 17 in the direction upwards to a thread guide channel 18, which guides the thread further to a not shown robot arm.
A thread brake cooperates with the bar 16 and is composed of a clamp plate 19, which is mounted at the outer end of a pneumatic cylinder 20 which is connected to the stand 10. The clamp plate can be brought in or out of engagement with the bar 16 by operation of the cylinder 20, whereby the feeding of the thread will be stopped.
The thread feeding buffer operates in the following way: During normal thread feeding, the pulling of the thread, via the thread eyelets 13 and the bar 16, creates an even resistance in the thread which results in an advantageous even outfeed. If the robot arm is moving in the room, so that more or less thread has to be fed out momentarily, the thread guide 17 will be able to move up and down respectively along the guide rods, wherein the thread will receive a rapid compensation in length.
If the feeding of the thread is to be stopped, this is made by activation of pneumatic cylinder 20 which then presses the clamp plate 19 against the bar 16.
REFERENCES:
patent: 1836613 (1931-12-01), Oehmichen
patent: 2589366 (1952-03-01), Guathier
patent: 3826438 (1974-07-01), Stanley
patent: 4962796 (1990-10-01), Grimm et al.
patent: 5139206 (1992-08-01), Butler
Aplicator System AB
Stryjewski William
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