Winding – tensioning – or guiding – Tension control or brake – Supply controlled
Reexamination Certificate
1999-11-23
2001-09-04
Walsh, Donald P. (Department: 3653)
Winding, tensioning, or guiding
Tension control or brake
Supply controlled
C242S131100, C242S149000, C242S15000R
Reexamination Certificate
active
06283399
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns a yarn braking device, in particular a double plate brake for textile yarns running from bobbin creels, with two pairs of brake plates through which said yarn passes and whose top and bottom plates are to be pressed together adjustably in order to tension the yarn passing through, with a two-armed plate lever disposed beneath the pair of brake plates and able from that location to influence pressure loads on each of said pairs by means of a respective one of the lever arms, and with a pressure adjusting device acting on the two-armed lever.
2. Description of the Prior Art
A yarn braking device having the aforesaid features is known from DEPS 975 270. The top plates are spring-loaded and the two-armed lever presses by means of a respective lever arm through a bottom plate to a top plate in order to partially compensate the spring load thereof. The magnitude of the compensating pressure depends on a yarn feeler supported on the braked yarn and responding to the yarn tension thereof, and the adjusting action of this feeler is distributed evenly between the two brakes. It is not provided to operate this yarn braking device with very low braking forces.
SUMMARY OF THE INVENTION
Contrastingly, the task of the invention is to improve a yarn braking device with the features cited a the beginning of this specification in such a way that both pairs of brake plates can be used at pressing forces as low as zero for the finest yarns and at maximal pressing forces for coarse yarns without the need to exchange the pressure adjusting device or its spring, particularly also in such a way that different braking forces are exerted at the pairs of brake plates.
It is preferred that the pressure adjusting device comprises a rocking lever that is stationary on the frame and of limited pivotability, and which with a first lever end engages the plate lever and by means of a second lever end can be acted on by a setting force. By means of the rocking lever, the forces generated by the pressure adjusting device can advantageously be introduced into the region of the plate lever. Since the rocking lever is affixed to the frame, the first lever end can transmit pressure forces merely by being laid on or against the plate lever. The rocking lever can, for example, reach underneath the plate lever to lift it in such a way that the bottom plate is urged by pressure out of an initial operating position. For example, out of the initial operating position with a pressing force of zero on the top plate. In the process, setting force must be applied to the second lever end in the same direction of rotation.
An advantageous improvement of the yarn braking device is realized in that the rocking lever acts on the plate lever to realize different lengths for the lever arms. The ability to predefine different lengths for the lever arms can be utilized above all to distribute the pressing forces generated by the pressure adjusting device differently between the pairs of brake plates. With sensitive yarns, in particular, the take-up pair of plates will be involved only slightly in the generation of yarn tension. Especially in the case of sensitive yarns, the take-up pair of plates serves primarily to prevent bunching of the yarn and/or the accumulation of twist. However, the different lengths of the lever arms can also be predefined so that they are able to offset an uneven distribution of mass of the plate lever over its length.
It is preferable that the rocking lever be displaceable in such a way as to predefine different-length lever arms of the plate lever. In this case, the rocking lever is also the element by which different-length lever arms of the plate lever can be adjusted or predefined. For this purpose, the position of the attack site of the first lever end on the plate lever can be influenced by the displacement of the rocking lever.
The aforesaid displacement can, in particular, by realized in that the rocking lever is disposed transversely to the plate lever and can be displaced in the direction of its rocker shaft on the brake frame. In such a case the rocker shaft can be realized as a displacing means, for example as an adjusting screw, by which the rocking lever is displaced transversely.
A structurally very advantageous embodiment of a yarn braking device is obtained in that said device has a base part that is fixedly connected to a strut of a brake frame and it has an exchangeable part that is detachably fastened to the base part and comprises the pair of brake plates, including the plate lever. The exchangeable part can be exchanged quickly and simply without tools, for example if there is a defect in the brake region of the yarn braking device or if brake plates with another surface are needed. This can be necessary for adaptation to different yarns, for example when multifilaments are to be processed instead of staple fibers.
REFERENCES:
patent: 2372053 (1945-03-01), Bodansky
patent: 2457450 (1948-12-01), Dewas
patent: 2629561 (1953-02-01), Heizer
patent: 2745610 (1956-05-01), Reyes
patent: 4429842 (1984-02-01), Kiipper
patent: 4809927 (1989-03-01), Colli et al.
patent: 5179980 (1993-01-01), Hubner et al.
patent: 5265548 (1993-11-01), Satoma
patent: 684268 (1994-08-01), None
patent: 975270 (1961-10-01), None
patent: 2339332 (1974-03-01), None
patent: 3113829 (1983-01-01), None
patent: 3505913 (1985-11-01), None
patent: 273477 (1988-07-01), None
patent: 683928 (1952-11-01), None
Alder Gunter
Kohlen Karl-Heinz
Kremer Hubert
Pandiscio & Pandiscio
Pham Minh-Chau
Sucker-Muller-Hacoba GmbH & Co.
Walsh Donald P.
LandOfFree
Yarn tension device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Yarn tension device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Yarn tension device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2540994