THREAD FEEDING BUFFER

Abstract: A thread feeding buffer for feeding a fibre thread (15) from a magazine roll (14) to a feed apparatus at a robot arm which is freely movable in the room. The thread feeding buffer comprises thread brake means (16, 19, 20) and at least one movable thread guide (17), on which a thrust force is acting. The thread is running from the magazine roll (14), via the brake means (16, 19, 20), through the thread guide (17) 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.

Description: TITLE Thread feeding buffer 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 the 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 schematicall y on the accompanying drawing, in which Fig. 1 is a plane view of a thread feeding bi fer according to the invention, and Fig. 2 shows the thread feeding buffer in Fig. 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. Now the feeding of thread at the end of the robot arm will continue for s short moment while the thread guide 17 moves upwards along the guide rods 11, until the pull in the thread is stopped. When it will be time for restarting the feeding, this will be commenced with a correctly pretensioned thread without the risk of loops or kinks on the thread. The invention is not limited to the above described embodiment, but several variations are possible within the frame of the accompanying claims. For example, the guide rods can be exchanged for other means for controlling a buffer of fibre thread. Further, a spring means can replace the action of gravity upon the thread guide means 17.

Claims: CLAIMS 1. A thread feeding buffer for feeding a fibre thread (15) from a magazine roll (14) to a feed apparatus at a robot arm which is freely movable in the room, c h a r a c t e r i z e d by thread brake means (16, 19, 20) and at least one movable thread guide (17) on which a thrust force is acting, and that the thread is running from the magazine roll (14), via the brake means (16, 19, 20), through the thread guide (17) 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. 2. A buffer according to claim 1, c h a r a c t e r i z e d in that the thread brake means comprises a runner (16), over which the thread (15) runs, and a clamp means (19) which acts on the roller and is controllable by means of a pneumatic cylinder (20) . 3. A buffer according to claim 1, c h a r a c t e r i z e d in that the thread guide comprises a holder (17) for thread eyelets ( 13) which is guided by means of guide rods (11). 4. A buffer according to claim 3, c h a r a c t e r i z e d in that the guide rods (11) are arranged in vertical, and that the thrust force acting on the thread guide (17) is provided by gravity. AMENDED CLAIMS [received by the International Bureau on 12 July 1995 (12.07.95); original claims 1-4 replaced by one new claim (1 page)] A thread feeding buffer for feeding a fibre thread (15) from a magazine roll ( 14 ) to a feed apparatus at a robot arm which is freely movable in the room, comprising a thread brake means (16, 19, 20) and at least one movable thread guide (17), wherein the thread is running from the magazine roll (14), via the brake means (16, 19, 20), through the thread guide ( 17 ) and further on towards the feed apparatus in such a way, that thrust force acts for creation of a thread buffer between the brake means and the feed apparatus, which buffer is variable in length, c h a r a c t e r i z e d in that the thread brake means comprise a runner (16), over which the thread (15) runs, and a clamp means (19) which acts on the runner and is controllable by means of a pneumatic cylinder ( 20 ) .

Inventors: SAND KJELL, SAND, KJELL
Applicants: APLICATOR SYSTEM AB, SAND KJELL, SAND, KJELL
Application year: 1995
Main classification: B65H59
IPC codes: B65H51, B65H59