Thread control device for a textile machine, in particular for a shedding device

• US 20070119142A1
• Filed: 11/05/2004
• Published: 05/31/2007
• Est. Priority Date: 11/28/2003
• Status: Abandoned Application

• Current Assignee: Textilma AG
• Original Assignee: Textilma AG
• Inventors: Engesser, Bernhard, Buhler, Erich
• Application Number:
  US10/581,004
• Publication Number:
  US 20070119142A1
• Time in Patent Office: Days
• US Class Current: 57/1.R
• CPC Class Codes: D03C 13/00 Shedding mechanisms not otherwise provided for
• CPC Class Codes: D03C 13/025 with independent frame drives
• CPC Class Codes: D03C 5/00 Cam or other direct-acting shedding mechanisms, i.e. operating heald frames without intervening power-supplying devices

Abstract

The invention relates to a thread control device for a textile machine, in particular, for a shedding device, with at least one thread guide body (31) which may be displaced in one displacement direction by means of a positive drive (35) and in the opposite direction by means of a non-positive, pneumnatic return device (36). Me return device (36) thus comprises a cylinder/piston unit (64,54), the cylinder chamber of which (52) is connected to a compressed gas source (60) by means of a valve (56). An improvement in control is achieved when the valve (56) comprises a first valve seat (72) connected to the cylinder chamber (52) and a second valve seat (76), between which a valve body (82), provided with at least one throttle point (80), may be displaced, pre-tensioned in the rest position by means of a spring (84) against the first valve seat (72), in which the throttle point (80) is ineffective and the valve body (82) blocks the communication with the compressed gas source (60) when the valve body (82) is in contact with the second valve seat (76).

Claims

1. A thread control device for a textile machine, in particular for a shedding device, said thread control device comprising:

at least one thread guide member which is moveable in one direction of movement by means of a positively designed drive and in the opposite direction of movement by means of a nonpositive and pneumatically designed return device, the latter having a cylinder/piston assembly the cylinder chamber of which is connected to a compressed gas source via a valve, wherein the valve has a first valve seat connected to the cylinder chamber and a second valve seat between which a valve member, provided with at least one throttle point is moveable, which valve member, in the basic position, is prestressed against the first valve seat by means of a spring, the throttle point being inactive and the valve member shutting off communication with the compressed gas source when the valve member is against the second valve seat.

2. The thread control device as claimed in claim 1, wherein the valve has a housing at one end of which the first valve seat is formed.

3. The thread control device as claimed in claim 2, wherein the second valve seat is formed on a closing-off part designed with a passage duct.

4. The thread control device as claimed in claim 2 wherein the housing is designed cylindrically, in which the piston-like valve member is guided, sealed off with respect to the housing wall.

5. The thread control device as claimed in claim 2, wherein a gap between the valve member and the housing wall of the valve serves as a throttle point.

6. The thread control device as claimed in claim 1, wherein the valve is arranged in the cylinder chamber.

7. The thread control device as claimed in claim 1, wherein the valve is arranged in the lowermost point of the cylinder.

8. The thread control device as claimed in claim 1, wherein a closing-off part of the valve is connected directly to a feed pressure chamber.

9. The thread control device as claimed in claim 8, wherein the feed pressure chamber has an oil separation outlet for oil coming from the cylinder chamber.

10. The thread control device as claimed in claim 9, wherein the oil separation outlet is arranged on a bottom of the feed pressure chamber.

11. The thread control device as claimed claim 10, wherein a connection for compressed air is arranged, at a distance from the bottom of the feed pressure chamber on a lateral wall of the feed pressure chamber.

12. The thread control device as claimed in claim 8, wherein the feed pressure chamber of at least one return device serves as a feed pressure and oil outflow device.

13. The thread control device as claimed in claim 1, wherein a lower portion of the cylinder serves as a valve housing and has a connection for the compressed gas source.

14. The thread control device as claimed in claim 13, wherein an annular stop is arranged inside the cylinder and is designed as a first valve seat connected to the cylinder chamber.

15. The thread control device as claimed in claim 14, wherein the cylinder is closed off by means of the closing-off part, the latter having a sleeve part the free end of which serves as a second valve seat.

16. The thread control device as claimed in claim 15, wherein an oil separation outlet is arranged on the closing-off part.

17. The thread control device as claimed in claim 1, wherein the switching pressure of the valve can be set by a change in the prestressing force of the spring.

18. The thread control device as claimed in claim 17, wherein the prestressing force of the spring can be set from outside.

19. The thread control device as claimed in claim 1, wherein the maximum compression pressure in the cylinder chamber can be set by means of the flow cross section of the throttle point.

20. The thread control device as claimed in claim 3, wherein the housing is designed cylindrically, in which the piston-like valve member is guided, sealed off with respect to the housing wall.