Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Patent
1998-04-07
2000-01-18
Falik, Andy
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
139192, 139194, D03D 4730, D03D 4734, D03D 4738
Patent
active
060149922
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a weaving machine with pneumatic weft thread insertion.
2. Description of the Prior Art
Weaving machines with pneumatic weft thread insertion are known from the prior art, with the weft thread insertion being carried out either by means of a pivotal insertion apparatus which is mounted on the reed or by means of an insertion apparatus which is mounted in a fixed location on the machine frame.
The weaving machines with pivotal insertion apparatuses have disadvantages. The respectively inserted weft thread is clamped and severed in the region of the reed beat-up, so that the introduction of the blower nozzles into the insertion position can only take place during the withdrawal of the reed, which in particular limits the number of blower nozzles and in addition makes a special control system necessary. Relatively large inertial forces, which lead to undesirable oscillations of the moved system, are produced through the back and forth movement of the reed provided with the insertion apparatuses, and the weft threads are set into uncontrolled oscillation during their passage from the thread feeder into the blower nozzles so that they cross and entangle with one another. The air lines and the actuation apparatus are subject to too great a mechanical stress, which makes a complicated and expensive control system necessary in particular for the actuation apparatus. Lower speeds of rotation of the weaving machine, which is associated with a loss in productivity, result from these disadvantages as a result of a higher likelihood of breakdown. Furthermore, it proves disadvantageous that the thread clamp and the shear are also mounted on the machine frame and are actuated via separate drive means, which results in increased complication and expense.
The object of the invention is to improve a weaving machine with pneumatic weft thread insertion in such a manner that the named disadvantages do not arise.
SUMMARY OF THE INVENTION
The object is satisfied in accordance with the invention by a weaving machine with pneumatic weft thread insertion, with the weaving machine having a reed and a weft thread guide apparatus which are connected to one another and are pivotal between an insertion position and a beat-up position, and a weft insertion apparatus which is arranged in a fixed spatial position and has at least one blower nozzle for the insertion of a weft thread into the guide passage, a thread clamp and a shear, with the thread clamp being coupled to the reed in order to clamp an inserted weft thread and to forward it synchronously with the guide passage from the insertion location up to the beat-up position, and with the shear being placed after the thread clamp in the beat-up direction of the reed in order to sever off the weft thread after the clamping.
The advantage that can be achieved with the invention is essentially to be seen in the fact that up to sixteen weft threads of differing kinds and colors can be used.
The invention will be explained in the following with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
The drawings show:
FIG. 1 a schematic view of an embodiment of a weaving machine with pneumatic insertion in accordance with the invention,
FIG. 2 a side view of the weft insertion region of the weaving machine, illustrated in section,
FIG. 3 a section along the line III--III in FIG. 2,
FIG. 4 a section along the line IV--IV in FIG. 2,
FIG. 5 a section along the line V--V in FIG. 2,
FIG. 6 a section along the line VI--VI in FIG. 2,
FIG. 7 a section along the line VII--VII in FIG. 2,
FIG. 8 an embodiment of a control apparatus for the blower nozzles,
FIG. 9 a section along the line X--X in FIG. 2 which illustrates the situation during the weft thread insertion,
FIG. 10 the section of FIG. 9 which illustrates the situation during the clamping of the weft thread,
FIG. 11 the section of FIG. 9 which illustrates the situation during the cutting of the weft thread and
FIG. 12 the section of FIG. 9
REFERENCES:
patent: 3926224 (1975-12-01), Vermeulen et al.
patent: 4572246 (1986-02-01), Ghiaro
patent: 4834145 (1989-05-01), Lewylie et al.
patent: 4967807 (1990-11-01), Lewyllie et al.
patent: 4993459 (1991-02-01), Shaw et al.
patent: 5649570 (1997-07-01), Wahhoud et al.
Falik Andy
Textilma AG
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