Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Patent
1997-02-14
1998-09-15
Falik, Andy
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
D03D 4727, D03D 4712
Patent
active
058065709
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a gripper weaving machine in accordance with the preamble of claim 1.
2. Description of the Related Art
Gripper weaving machines of the type mentioned above are known, for example, from EP-OS 0 137 376 which is described more fully in the accompanying FIG. 1. The problem in gripper weaving machines of this kind consists in that when the guide pins emerge from the weaving shed, the guide pins on the weaving reed side can hook onto the warp threads resulting in broken warp threads and malfunctioning. Further, selvage threads or edge threads lying on the weft band and/or incorrectly placed foundation warp threads can get caught between the weft band and the guide recess of a guide pin during the movement of the weft band, which can again lead to malfunction and/or warp thread breakage. This catching is abetted especially by wear marks caused by sliding, e.g., chatter marks, which can form at the edges of the weft band guided in the guide pins and can carry along contacting threads.
Further, CH-PS 682 572 discloses gripper weaving machines in which the weft band and the gripper rest upon the warp threads and wherein guidance is effected between guide pins. In this regard, it is disadvantageous that movement is hampered due to the fact that the weft band and gripper lie on the warp threads and the warp threads are subjected to a severe strain, so that only warp threads of a certain level of quality can be used.
SUMMARY OF THE INVENTION
The object of the invention is to improve a gripper weaving machine of the type mentioned above.
In accordance with the present invention, the gripper weaving machine has at least one gripper which is arranged at a weft band and guided in reciprocating motion in a shed, wherein the weft band in the shed is guided on both sides at guide pins in guide recesses at a distance from the warp threads. Each of the guide recesses of the guide pins facing the weaving reed has a lower guide surface which runs out at least parallel to the plane of the weft band and an upper guide surface opening toward the weft band at an angle relative to the plane of the weft band, wherein the edge of the weft band engaging in the guide recesses has an adapted cross section and the weft band has a protruding portion on the underside between the edges.
To prevent the guide pins from hooking the warp threads when emerging from the weaving shed and crossing the warp threads, especially those of the lower shed, and thus to prevent malfunction and/or breakage of warp threads, an upper guide surface of the guide pins facing the weaving reed opens toward the weft band at an angle .alpha. relative to the plane of the weft band, wherein, further, the edge of the weft band is adapted in cross section. Moreover, this construction makes it more difficult for warp threads lying on the weft band to become caught in the slit between the guide recesses and weft band. A construction on the underside of the weft band between its guiding edges prevents threads from being carried along and caught in the slit between the guide recesses and the weft band. This substantially improves the dependability of operation of the gripper weaving machine.
Due to the fact that the gripper and the weft band are guided without contacting or resting upon the warp threads, no friction is generated at the warp threads on the one hand and the risk of the warp threads catching in the slit between the guide recesses and weft band is prevented on the other hand. Thus, it is possible to work with very weak and inexpensive yarns. This construction further allows the gripper and the weft band to run through the shed cleanly and with low vibrations and low noise. Accordingly, the guiding of the gripper and weft band is also not sensitive to soiling which can occur, for example, as a result of accumulated sizing materials or dust.
The solution according to the invention substantially reduces malfunctions and wear at the weft band and/or damage to warp threads, in addi
REFERENCES:
patent: 4638839 (1987-01-01), Pezzoli
patent: 4834146 (1989-05-01), Pezzoli
patent: 5092374 (1992-03-01), Riolet et al.
patent: 5176185 (1993-01-01), Rheinganz et al.
Falik Andy
Kueffner Friedrich
Textilma AG
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