Lindauer Dornier Gesellschaft Mbh

Hans-Dieter Scorl

Adnan Wahhoud

Peter Czura

Josef Hehle

Werner Birner

Valentin Krumm

Peter D Dornier

Peter Schiller

Stephan Arndt

Herbert Reinhardt

Ralf Koehnen

Trinh Duy Dien

Ulrich Loehr

Walther Truyen

A method and a device limit the normal shed opening angle (&agr;) of warp threads in an open loom shed, to a smaller limited shed opening angle (&agr;,) that applies to the selvedge warp threads over a selvedge laying-in width at the edge of the fabric. The limited shed opening angle (&agr;,) is smaller than the normal shed opening angle (&agr;) and is selected to provide optimal positioning and binding-in of the free thread end of a beat-up weft thread that is guided back and laid or tucked into the next open shed to form a high quality laid-in selvedge. The shed opening limit device includes two thread-constraining prongs that extend perpendicularly to the direction of the warp threads at least along the desired laid-in depth of the selvedge. The selvedge warp threads are guided and constrained between the prongs so that the extent of shed opening of the selvedge warp threads is limited to the limited angle (&agr;,).

Method and arrangement for limiting the loom shed opening angle

A weft stretching and detecting device for a pneumatic weaving loom has a housing or mounting (6) with a weft guide channel section (8) in axial alignment with the weft insertion channel (2A) in the reed (2) of the loom and a weft stretching channel section (12) also in said housing or mounting (6). A single weft stop motion device (13) is constructed and positioned for detecting a weft insertion fault either in the guide channel section (8) or in the stretching channel section (12).

Weft stretching and detecting apparatus for a jet weaving loom

A weft stretching and detecting device has a first section (1A) for stretching a weft thread and a second section (1B) for monitoring the arrival of a leading weft end (11A) either through a weft guide path (4, 7, 7B) which is aligned with a weft insertion channel (2A), or through a weft stretching guide channel (6, 9, 8) which is laterally displaced relative to the weft insertion direction defined by the weft insertion channel. The weft monitoring second section (1B) is mounted in a sley extension (3A) for a sliding movement axially back and forth along the sley extension (3A), whereby a spacing between the first section (1A) and the second section (1B) is adjustable. A single weft stop motion device (10) is mounted in the weft monitoring second section (1B) for monitoring the weft guide path and the weft guide channel for the arrival of a weft thread leading end through the guide path or through the guide channel.

A thread guide formed as a guide eyelet especially for a leno disk has an entrance with an opening angle (.alpha.) and an exit with an opening angle (.beta.). The entrance and exit are interconnected by a guide bore or hole (6) surrounded by a curved bore ring surface or bead (9). The entrance and exit each have a recess (4, 5) surrounded by a respective rim portion (7, 8) of a rim surrounding the thread guide eyelet (2A, 2B). Each rim portion (7, 8) has an edge with a curved ring surface (R1 and/or R3) surrounding the respective entrance (10) and exit (11). The entrance and exit curved ring surfaces are spaced from the bore ring surface or bead (9) so that a thread passing through the thread guide has a small surface area contact with these curved ring surfaces to reduce friction while providing a positive guidance for the thread.

Leno device with a thread guide eyelet

A wide selvage is formed along a fabric edge in a weaving loom by at least two selvage forming heads arranged in a row with an outer selvage forming head (9) and an inner selvage forming head (8) positioned between the outer selvage forming head (9) and an edge of a fabric. The outer selvage forming head (9) seizes a weft end and transmits it to the inner selvage forming head (8) which inserts it into the shed for beat-up. Both forming heads work pneumatically and in tandem with each other. A set of two selvage forming heads (8, 9) is arranged at each fabric edge.

Method and selvage forming device for an air weaving loom

The weaving of terry cloth is improved by preventing slackening of the warp threads during beat-up. The warp threads are kept in contact with a warp tensioning faller roller (8) at all times. For this purpose the faller roller (8) is eccentrically mounted and biased by a spring (46) retraction force applied through a control lever (48). The force of the spring (46) is in balance with the tension on the warp threads (4), whereby the spring (46) causes a warp length compensation during shed formation. A piston rod (52A) of a piston cylinder drive (52) acts on the control lever (48) of the faller roller (8). By pressurizing the cylinder (52), the faller roller (8) is tilted about an eccentrically mounted bearing shaft (14) and a rated pile warp thread length (54) is delivered or fed, without the pile warp threads (4) lifting away from the faller roller (8). One chamber of the drive cylinder (52) is periodically pressurized in synchronism with the terry cloth drive (17) for the beat-up of a group of weft yarn threads or both chambers of the drive cylinder (52) are pressurized for weaving a border or trim.

Pile warp thread tension control apparatus for terry cloth weaving

A weft guide channel (6) in a reed of an air jet loom can be lengthened or shortened by telescoping sections forming one or two channel extension members (10, 18) and/or by intermediate inserts (21, 22, 23) that also have a weft guide channel portion (21A, 22A, 23A). The extension member (10) and the inserts are mounted to a mounting bracket (9) which itself is secured to the reed and/or the sley carrying the reed. At least one weft stop motion device is provided for each extension member and/or for the respective insert. One of the extension members is provided with air ducts (14, 15) for a crosswise air flow for stretching a weft thread.

Weft detecting and stretching apparatus in a jet weaving loom

Faults in fabrics such as smooth woven fabrics or pile fabrics caused by transition operational conditions are avoided, especially on air nozzle weaving looms. Such transition operational conditions may occur when rated operating parameters must be changed, for example, due to the use of a different type of weft thread or a change in the weaving pattern and/or weave binding. For this purpose, the weft thread insertion is interrupted only during the duration of the so-called transition operational conditions. Weft insertion is interrupted by performing so-called fluidic or non-fluidic empty or mis-shots. Simultaneously, the warp let-off and the fabric take-up is controlled as a function of the number or duration of the empty or mis-shots in such a way that at this point of time during the transition operating conditions the beat-up edge of the fabric is held in a position away from the beat-up position of the reed.

Method for avoiding fabric faults during transitional loom operating

A high proportion of fly lint and dust is intercepted inside a loom before settling, by a suction device (17, 18) positioned inside the loom below the rear shed and the heald frames so that air from a blower head (3) movably mounted (at 4) above the loom must pass through the rear shed and between the heald frames. The suction device has a plurality of suction boxes (18) pivotally interlinked with each other to form a suction channel chain (17) which is flexible so that the position of the suction channel chain (17) can be adapted to the space available inside the loom for an effective interception of fly lint and dust. One section of the suction channel chain extends approximately horizontally parallel to and below the rear shed, while another suction channel chain section extends approximately vertically and approximately parallel to the heald frames.

Growing community of inventors

Lindau, Germany

Hans-Dieter Scorl