Claims
- 1. A yarn exchange and doffing device for use with a two-for-one twister having a plurality of twisting units for producing winding packages, the twisting units having a yarn tube carried by a cradle arm, the twisting units additionally including indicator means for indicating the completion of a yarn end finding operation, the exchange and doffing device comprising:
- yarn changing means for exchanging a new yarn feed package for an old yarn feed package;
- yarn end finding means for finding a yarn end on the new yarn feed package, wherein the yarn end finding means comprises suction means for applying a suction force to the yarn end and sensor means for sensing the presence of the yarn end;
- sensor means for sensing the indicator means;
- air flow means for producing an air flow;
- threading means for using the air flow to insert the yarn end into an axial hole of the new yarn feed package;
- doffing means for removing a full winding package and supplying a new yarn tube to the cradle arm; and
- yarn engaging means for engaging the yarn end with the yarn tube;
- wherein the device will bypass a twisting unit unless the sensor means senses the indicator means.
- 2. The device of claim 1, wherein the indicator means comprises a display lever, the exchange and doffing device further comprising:
- raising means for raising a display lever.
Priority Claims (4)
Number |
Date |
Country |
Kind |
1-63857 |
Mar 1989 |
JPX |
|
1-66379 |
Mar 1989 |
JPX |
|
1-73863 |
Mar 1989 |
JPX |
|
1-73865 |
Mar 1989 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 07/494,145 filed on Mar. 14, 1990, now abandoned.
US Referenced Citations (6)
Number |
Name |
Date |
Kind |
3599413 |
Nimtz et al. |
Aug 1971 |
|
4120142 |
Franzen |
Oct 1978 |
|
4848077 |
Kawarabashi et al. |
Jul 1989 |
|
4928476 |
Otoshima et al. |
May 1990 |
|
4979360 |
Kallmann et al. |
Dec 1990 |
|
4998405 |
Frentzel-Beyme |
Mar 1991 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
2756504 |
Jun 1979 |
DEX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
494145 |
Mar 1990 |
|