Cutting – Tool engages work during dwell of intermittent workfeed – Dwell initiated by disengagement of surface of moving...
Patent
1997-01-21
1999-02-23
Rachuba, M.
Cutting
Tool engages work during dwell of intermittent workfeed
Dwell initiated by disengagement of surface of moving...
83 98, 83348, 83402, 83950, B26D 520
Patent
active
058732918
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention refers to an apparatus for cutting fibrous reinforcement material in relationship with an ejector nozzle, comprising at least two feeding rollers and a rotary cutter which is provided with a substantially cylindrical mantle surface with attachments for a number of knife means and which cooperate with a support roller with an elastic surface layer for forming a thread nip.
BACKGROUND OF THE INVENTION
In robot-controlled production, there is usually a high demand for precision in the delivery of raw material. For example, when feeding fiber thread to a robot-controlled fiber feeding apparatus, the feeding rate may be about 10 meters per second. If jerks occur in feeding, the thread may be torn off or damaged, which will lead to serious losses in production.
When cutting fiber thread, a cutting apparatus of the above described type is normally used. Each time the fiber thread is hit by the sharp edge of the knife means, the fiber is folded in V-shape around the edge while being pressed into the elastic layer of the support roller. This operation occurs at a high frequency during a period of time of some fractions of a second. The mechanical deformation leads to fracture of the single fibers of the thread.
Known apparatus for this purpose are adapted to cutting fibers of a certain thread length. The distance between two cuts normally depends upon the distance between the knife means of the cutter. Thus, the feeding rate of the feeding rollers and the cutter is synchronized.
It would be desirable to be able to vary the length of the cut fiber pieces inf initely variable. Besides, a drawback with the method is in that a sudden jerk is developed in the thread each time it is hit by a knife means, because the thread is momentarily accelerated while being folded around the knife edge. These rapid jerks can lead to tearing off of the fiber thread at wrong places.
THE TECHNICAL PROBLEM
One object of the present invention is therefore to provide a cutting apparatus which enables infinitely variable length of the cut f ibre pieces, and which is able to dampen the jerks which are developed when the edge of the knife means hit the fiber thread.
THE SOLUTION
For this purpose the invention is characterized in that the mantle surface of the cutter is provided with slot-shaped recesses for the fiber thread, which recesses extend peripherally along the mantle surface between the knife means enabling the thread to be fed forward by means of the feeding rollers at a feeding rate which deviates from the speed of the cutter, for adaption of the cutting length of the fiber thread.
DESCRIPTION OF THE DRAWINGS
The invention will be described here below with reference to an embodiment shown in the accompanying drawing, in which
FIG. 1 schematically shows a fiber feeding device in a view from the side,
FIG. 2 shows in a plane view in somewhat larger scale the nip between the cutter and the support roller, and
FIG. 3 is a section along the line III--III in FIG. 2.
DESCRIPTION OF PREFERRED EMBODIMENTS
The feeding apparatus schematically shown in FIG. 1 is used mounted upon a robot arm not shown, for feeding out fiber thread 10 and binding agent in the form of powder from not shown magazines, for example to molds for plastic products.
Preferably, the robot arm is freely movable in the room and is governed by a micro processors not shown, which can be programmed.
The fiber thread 10 is drawn from its magazine into the feeding apparatus by means of two feeding rollers 11, 12, which form a nip for the fiber thread and comprises a first motor driven roller 11 and a second co-rotating roller 12.
The roller 12 has a displaceable bearing not shown which is pressed in the direction towards the roller 11 by means of a compression spring 13. The roller 11 is driven in a speed. adjustable manner by means of a not shown driving motor.
The rollers 11, 12 feed the fiber thread 10 forward via a compressed air ejector 14 and a tube 15, which is bent to about 90.degree. and the thread emerges into the
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Aplicator System AB
Pryor Sean A.
Rachuba M.
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