Claims
- 1. A yarn tensioning device for a textile weaving machine of the type which is arranged to weave a three-dimensional fabric by interweaving a number of yarns fed from a corresponding number of yarn carriers, said yarn carriers being driven by a carrier drive mechanism to shift the respective positions along predetermined loci of movements within a common carrier shifting plane, said yarn tensioning device comprising:
- a high tensioning mechanism mounted on each one of said yarn carriers and arranged to act with a small yarn drawback capacity and a high yarn tensioning capacity relative to a feed yarn being withdrawn from a bobbin on said carrier to impart a high unwinding tension thereto; and
- a low tensioning mechanism mounted between said carrier and bobbin and arranged to act with a large yarn drawback capacity and a low yarn tensioning capacity relative to the bobbin through a rotational coupling therewith;
- said high tensioning mechanism being adapted to impart a high tension to said feed yarn being withdrawn from the bobbin in a yarn draw-out phase of operation; and
- said low tensioning mechanism being adapted to take over from said high tensioning mechanism to impart a low tension to the feed yarn being rewound onto the bobbin in a yarn draw-back phase of operation at a limit point of yarn draw-back by said high tensioning mechanism to take up any slack remaining in the feed yarn after drawback by said high tension mechanism;
- wherein said bobbin is rotatably fitted on a bobbin support shaft erected non-rotatably at the center of said yarn carrier, and said high tensioning mechanism has a support member mounted on an upper end portion of said bobbin support shaft, said support member having a yarn guide for a yarn to be unwound from said bobbin and fed out upward of said bobbin support shaft.
- 2. A yarn tensioning device as defined in claim 1, wherein said bobbin support shaft is detachably mounted on said yarn carrier through a joint structure including: a receptacle hole formed in said carrier; a U-pin fitted across said receptacle hole; a tapered foot portion formed at the lower end of said bobbin support shaft to spread apart said U-pin when fitted into said receptacle hole; and a recessed portion provided immediately above said tapered foot portion to nest said U-pin therein; said bobbin support shaft being held in a resiliently pressed state at said recessed portion by said U-pin.
Priority Claims (4)
Number |
Date |
Country |
Kind |
5-39551 |
Feb 1993 |
JPX |
|
5-90833 |
Mar 1993 |
JPX |
|
5-90834 |
Mar 1993 |
JPX |
|
5-90835 |
Mar 1993 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 08/313,043 filed on Oct. 03, 1994 now allowed which was filed a PCT/JP94/00161 filed Feb. 3, 1994, now U.S. Pat. No. 5,584,223.
US Referenced Citations (8)
Foreign Referenced Citations (5)
Number |
Date |
Country |
483789 |
May 1992 |
EPX |
730307 |
Jan 1943 |
DEX |
52-36062 |
Aug 1987 |
JPX |
3-19947 |
Jan 1991 |
JPX |
309152 |
Nov 1955 |
CHX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
313043 |
Oct 1994 |
|