Textiles: manufacturing – Textile product fabrication or treatment – Fiber entangling and interlocking
Patent
1989-07-14
1991-07-16
Schroeder, Werner H.
Textiles: manufacturing
Textile product fabrication or treatment
Fiber entangling and interlocking
28214, D04H 1800
Patent
active
050312898
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a transfer device for the inlet of a tufting machine.
The present invention also concerns, for a tufting machine, a compression and introduction device which comprises such transfer devices.
To compress and introduce a bundle of fibers entering a tufting machine, the bundle is made to pass between two rollers. To limit on the one hand the re-expansion of the bundle and on the other hand the loss of part of the fibers, the run from the rollers to the tufting passage of the tufting machine extends between two rows of oblique flexible teeth.
It will readily be seen that the compression and introduction device only imperfectly fulfills it roll. The fibers are not positively conducted into the tufting passage. They arrive there after having partially re-expanded. The fibers tend to escape between the outlet of the rollers and the inlet of the tufting passage.
The object of the invention is to provide a transfer device, as well as an apparatus for compression and introduction, which overcomes these drawbacks.
According to the invention, the transfer device adapted to form a portion of a device for compression and introduction to the inlet of a tufting machine and comprising a roller is characterized in that it comprises flexible endless transport means having a transport run between one upstream end of the flexible transport means about the roller and a downstream end at which the flexible transport means passes about at least one nose, differential spacing means being provided to adjust to different values according to different points on the width of the device the distance between the axis of the roller and the downstream end of the transport run.
Thus, the flexible transport means can positively drive the bundle for a certain distance. The downstream end of the transport run may be very close to the inlet to the tufting passage. Thus, at this end, the transport means passes about noses, which permits it to deliver the transported product with great precision.
The differential spacing means overcome the problems habitually attending conveyor belts whose developed length is small relative to the width.
The invention resides in the surprising realization that it is possible to guide suitably a belt of relatively short length relative to its width by varying the distance between the axis of the roller and the downstream end of the transport run, and this in a differential manner at different points along the width of the flexible means.
This manner of stabilizing the flexible means is based on the assumption that the variations in positioning of the flexible means whose width is greater than its length are due to the variations in the developed length at different points across the width of the belt. This supposition leads one to seek to stabilize the belt laterally by compensation of said variations for example by equalizing the tensions at different points along the width, and/or by the deliberate creation of conditions of suitable variation with a view to displacing laterally the flexible means in the direction contrary to that of an error ascertained in the lateral position of the belt.
According to a second aspect of the invention, the compression and introduction device for a tufting machine comprises two transfer devices of the type described above, mounted such that their transport runs face each other.
Other features and advantages of the invention will become apparent from the following description:
In the accompanying drawings, given by way of non-limiting examples:
FIG. 1 is an elevational and longitudinal cross-sectional view of a tufting machine provided with a compression and introduction device according to the invention;
FIG. 2 is a side elevational view, on an enlarged scale, of the compression and introduction device of the tufting machine of FIG. 1;
FIG. 3 is a fragmentary view of the compression and introduction device on the line III--III of FIG. 2;
FIG. 4 is a cross-sectional view on the line IV--IV of FIG. 3 on an enlarged scale;
FIG. 5 is a view of a deta
REFERENCES:
patent: 2809600 (1957-10-01), Robb et al.
patent: 4185738 (1980-01-01), Tsukumo
Asselin Pierre
LeRoy Guy
Calvert John J.
Etablissements Asselin
Schroeder Werner H.
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