EP0171386A1

EP0171386A1 - Guiding on device for winchdrum.

Info

Publication number: EP0171386A1
Application number: EP83901234A
Authority: EP
Inventors: Jan Fonger Minnee
Original assignee: Individual
Current assignee: Individual
Priority date: 1982-02-11
Filing date: 1983-04-07
Publication date: 1986-02-19
Also published as: NL8200512A; WO1984003876A1; EP0171386B1

Abstract

La présente invention, appartenant à la catégorie des bobineuses automatiques de fil métallique, a trait à une application plus simple du principe connu selon lequel un fil tendu choisi la distance la plus courte entre deux points, mais si cela n'est pas le cas, il n'aura de préférence pour aucune position particulière, sauf pour suivre l'enroulement sur le tambour. Cela peut être effectué par une poulie mobile se déplaçant le long d'une piste en forme d'arc dans un plan perpendiculaire entre le tambour et la poulie fixe. Le rayon de cet arc dépend de la distance relative entre la poulie de bobineuse et le tambour et la poulie fixe, de la largeur du tambour et de la hauteur du sommet de la piste au-dessus de la ligne de base, formée par la tangente sur le tambour et la poulie fixe. La poulie peut être montée sur un bras oscillant, mais, en vue d'une réduction de dimension et d'une meilleure adaptation aux phénomènes théoriques et pratiques, le cadre de la poulie devrait pivoter et rouler simultanément. La bobineuse doit être contrebalancée de façon à conserver sa position primitive lorsque le fil se relâche. Une telle construction permet un bobinage très compact pour un treuil.The present invention, belonging to the category of automatic wire winders, relates to a simpler application of the known principle according to which a stretched wire chooses the shortest distance between two points, but if this is not the case, it will preferably have no particular position, except to follow the winding on the drum. This can be done by a movable pulley moving along an arcuate track in a plane perpendicular between the drum and the fixed pulley. The radius of this arc depends on the relative distance between the winder pulley and the drum and the fixed pulley, the width of the drum and the height of the top of the track above the baseline, formed by the tangent on the drum and fixed pulley. The pulley can be mounted on an oscillating arm, but, in order to reduce size and better adapt to theoretical and practical phenomena, the pulley frame should pivot and roll simultaneously. The winder must be counterbalanced so as to maintain its original position when the thread slackens. Such a construction allows very compact winding for a winch.

Description

GUIDING ON DEVICE FOR WINCHDRUM

The invention concerns an appliance which becomes necessary to wind a wire evenly over the full length of the drum in cases where the fleet angle exceeds approx.4^o or where the distance of the lead or fixed sheave in front of the drum is shorter then approx.7 times the drumlength.

Conventional spooling arrangements adjust the wire position opposite the drum by means of mechanical drives, the invention however belongs to the category working on the principle that the appliance is directed by the previously laid-on drumwinding alone and all other influences are eliminated.

This condition is fulfilled if, in any position of the spooling gear between drum (3) and fixed lead (2) , the total length of wire between the meeting points on drum and sheave remains constant fig.2 - a + c = a' + c'. As the taut wire always tries to find the shortest distance between those two points and if this does not exist, there will be no preference for any position at all. The spooler must therefore,apart from moving along the drum also travel along a path such that a + c remains constant. This path lies in a plane perpendicular to the wire and proves to be almost circular with a radius R depending on the distances a, b, c, the angle of the wire at the spooler sheave.

Because the force generated by the wire in the spooler should not influence the movement either, it is necessary that the direction of this force must be perpendicular to the path and should not cause interfering resistances along the path.

A wellknown device fulfilling these conditions produces the required path by means of a sheave rotating and translating along a shaft which in turn, by means of cranks placed at either end at different angles, makes an oscilating movement in front of the drum, the character of the path being governed by the length and angle of the cranks. The use of swiveling bearings for this shaft restricts the cranklength in comparison with the drum length and so the application to the condition a > 2.4 b.

For these long drums and high loads special high tensile materials are required . in addition, complicated dismounting and provisions for maintaining the proper position of the sheave when the wire slackens are necessary. The invention aims at a device with applications up to a = b, merely depending on the wire run over the leadsheave (2) with the intention to realise more compact winch arrangements by simpler means; minimum a + c. The required path is produced by a "tumbler" sheave, pivoting on a foundation in front of the drum such that the tangent to drum and fixed lead halves the tumblers height, causing the wire reaction to point at the hinge.

This condition determines various related factors e.g. each ratio a/c determines one optimum curve/radius and minimum size of the spooler related to b.

It also indicates that the number of layers on the drum has limits, if the tangent cuts the tumbler above midheight, then a preference for the central part of the drum will be shown (empty drum) whereas guiding on to a full drum a preference for the sides will be shown. Due to the steering forces developed by the wire already on the drum, the working range between unacceptable preferences is sufficient for practical use and can be increased by choosing a larger tumbler than the minimum size. Besides : the tendency to cover the sides of a full drum may be useful in cases where a mechanically driven tumbler spooler may be advantageous in comparison with the usual transverse guiding-on gear with diamond threaded drive shaft, where the required force is much heavier (fig.5) and the means weaker.

A practical way of producing the required path is found in a tumbler not having a fixed hinge pin, but a round toe which while rocking is also rolling over a transverse rail, thus reducing the physical dimensions of the tumbler, reducing support pressure by spreading it over a larger surface and enabling the device to be counterbalanced so that, when the wire slackens, it remains in its original position (fig.3) Structurally the generated forces in the tumbler do not require the use of special material or parts.

A centering system to ensure the tumbler is kept central in front of the drum using cross wire ropes and a wide enough toe to ensure lateral stability is simple but sufficient. A further measure to minimize sheave wear is given by an additional hinge point in the centreline of the winch, at a certain distance from the device causing the toe to swing gradually over the rail in order to swivel the sheave in the correct angle of the wire run from drum to fixed lead. This may be realised by means of a protruding cam near the bottom of the toe reaching into a fixed camplate, in which it moves vertically up and down when the tumbler rocks and rolls. When such a camplate is also mounted at the other side of the tumbler with a different shaped profile to follow the cam along its path, then the tumbler will be secured in all directions and can be used in all positions if required.

Fig.4 presents a compact winch arrangement, providedwith slotted plates and cam (2) , while fig.5 shows a tumbler spooler with mechanical external drive.

Claims

1. A tumbler-sheave spooling device for winchdrums fitted between drum and fixed lead with the feature that the sheave travels along a certain circular path by rotating around a fixed centre such that the movement is caused exclusively by the wire position on the drum with external steering as an option.

2. A tumbler-sheave spooling device as mentioned under 1 with the feature that the required path is produced by rotating and rolling.