US2635873A - Guiding device for webs - Google Patents

Description

April 21, 1 953 1- WORM 2,635,873

GUIDING DEVICE FOR WEBS Filed Nov. 3, 1949 BY fi iw/ w f Ah ATTORNEYS Patented Apr. 21, 1953 GUIDING DEVICE FOR WEBS Hugo Fritz Worm, Uddevalla, Sweden, assignor to Aktiebolaget Teximpex, Uddevalla, Sweden,

a corporation of Sweden Application November 3, 1949, Serial No. 125,233 In Sweden May 8, 1947 2 Claims. 1

The present invention relates to guiding devices for webs, for instance a textile fabric running between different machines, in a, dye-house or the like, where the running web has to be stretched in transverse direction so that it will be quite flat.

One object of the invention is to provide a device of the type mentioned above which is simple to manufacture and which will function satisfactorily even at high speed of the web.

A further object of the invention is to provide a feeler means sensible to lateral movement of the web which does not cause any folding of the web edge.

On the accompanying drawing there is shown an embodiment of the invention. Fig. 1 is a plan view of a guiding device, comprising two roller means, and Fig. 2 is a side view of one of the roller means in Fig. 1 on a larger scale.

In the drawing I indicates a stand supporting two rotatable rollers 3 and 4. The roller 3 is journaled at the stand by means of a shaft 5 while the other roller 4 is journaled in a yokeshaped roller holder 6 which is in turn rotatably fastened to the stand I. The roller 4 is rotatable round a shaft 1 between the legs of the U- shaped roller holder, which is actuated by a spring 8, which is secured to the stand and presses the roller 4 against the roller 3. The spring 8 cooperates with an arm 9 on the roller holder 6 which arm at its free end is provided with a cam II].

On the stand I there are provided two bearings II for a shaft 12, which bears a swingable feeler arm l3. At its free end the arm 13 is formed like a fork with three prongs which are adapted to slidably grasp over the edge portion l6 of the running web as shown in Fig. 1. The feeler device has the form of a bell-crank lever, the arm l3 being connected to a second arm [4 which bears a roller [5 cooperating with the cam ill on the arm 9.

As shown in Fig. 1 there are two roller means for guiding the web, one at each edge of the web. They are secured to a common U-beam I! which in the embodiment shown is swingable and adjustable in desired positions round a shaft l8 parallel with the beam. One of the roller means or both may be displaceable along the beam for accommodation to different web widths. Further the roller means are swingably mounted on the beam ll, so that the rollers 3 and 4 may be adjusted in different angles relatively to the center line of the web.

The device functions as follows:

During the movement of the web in the direction indicated by arrows in the drawing the rollers 3, 4 in the two roller means exert a stretching action upon the web in the transverse direction thereof. If the web for some reason should displace itself transversely, for instance towards the left in Fig. 1, the feeler arm [3 of the left roller means is actuated by the web edge and swung clockwise. Hereby the roller l5 rolls over the cam I0 and presses the arm 9 downward against the action of the spring 8 so that the rollers 3 and 4 are separated or the pressure between them is decreased, whereby the transversely directed stretching force of the rollers decreases. As the one roller means is constructed and arranged as the mirror image of the other the right roller means pulls the web toward the right to its correct position between the roller means and acts in the corresponding manner as the left roller means when the web is displaced toward the right.

The prongs of the forks at the ends of the feeler arms 13 are somewhat diverging so that they form V-shaped clips for the web edges. When the web edge is forced inwards between the fork prongs the friction force is increased so that the feeler arm is swung under the action of the lengthwise movement of the running web. It is also evident that the web edge has no possibilities to be folded at the lateral movement of the web.

What I claim is:

1. Guiding device for running webs, comprising two roller means adapted to be placed one at each edge of the web, each roller means comprising a stand, a first roller journaled in said stand, a movable roller holder supported by said stand, a second roller journaled in said roller holder, resilient means for pressing said second roller towards said first roller to engage the adjacent edge of the web therebetween, the axes of the rollers of each roller means being so inclined with reference to the center line of the running web as to stretch the running web transversely, a feeler device for each roller means, each feeler device comprising a bell-crank lever having a feeler arm terminating in a three pronged fork adapted to grasp over an edge of the web, means supporting each feeler device on its associated stand for swinging movement of the feeler arm in the plane of the running web, and motion-transmitting means including the second arm of said bell-crank lever for rocking 3 the associated movable roller holder to lessen the pressure between said rollers upon movement of a feeler arm by a deviation of the web towards that feeler arm.

2. Guiding device according to claim 1, characterized in that said motion-transmitting means comprise-- acamroller. on said second arm Qf; the bell-cranklever and: a: cam on saidroller holder.

HUGO FRITZ WORM.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date Tandel Mar. 26, 1935

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