Lindauer Dornier Gesellschaft Mbh

Lindauer Dornier Gmbh

Lindauer Dornier Gesellschaft MIT Beschränkter Haftung

Peter Czura

Adnan Wahhoud

Josef Hehle

Hans-Dieter Scorl

Herbert Mueller

Werner Birner

Herbert Reinhardt

Peter D Dornier

Dieter Teufel

Peter Schiller

Markus Gielen

Thomas Laukamp

Fritz Rupflin

Ewald Zimmermann

Harald Arnold

Wolfgang Metzler

Walther Truyen

For producing woven fabrics with additional pattern effects, one or more effect threads are supplied substantially in the warp direction and are moved over neighboring warp threads in the weft direction, above a weft thread that is to be inserted, in various motion cycles of a weaving machine. Subsequently the effect threads are positioned below a subsequent weft thread, by submerging the effect threads into upwardly open reed gaps of a reed. To facilitate this, the reed includes first reed blades which, at their upper end, each include a sloping thread guide element projecting in the longitudinal direction of the reed, so as to at least partially extend over the upwardly facing opening of a neighboring reed gap. The reed further includes second reed blades having no such sloping thread guide elements. The guide elements guide the effect threads down into the proper reed gaps.

Reed and weaving machine for weaving pattern formation in woven fabrics with additional pattern effects

A loom simultaneously forms a plain weave () and a gauze weave () in a textile () in one weaving cycle. To form the plain weave (), the adjacent warp threads () that are used to form the upper shed and lower shed are alternately lifted from the lower shed position into the upper shed position and lowered from the upper shed position into the lower shed position by the same drop wire/needle shank (). To form the gauze weave (), only the warp threads () that form the upper shed are raised by the drop wire/needle shank () from the lower shed position into the upper shed position and lowered from the upper shed position into the lower shed position.

Method for producing a fabric in plain weaves and leno weaves and a loom for carrying out the method

Ground warp and pile warp thread sheets are supplied to a shed forming device. The ground warp and the pile warp are separately deflected over a deflecting rod upstream from the shed forming device. The deflecting rod supports the ground warp and directs the pile warp to cross and interpenetrate through the ground warp before deflecting the pile warp into the back shed. The deflecting rod is positively driven and controlled to pivot about a horizontal axis to provide a positive controlled partial compensation of the pile warp thread length variations. The pile warp also runs over a pile warp thread reserve and compensating device upstream from the thread crossing location to provide an additional passive uncontrolled compensation of the pile warp thread length variations and to provide a pile warp thread reserve during the pile loop formation and/or the shed changes in the weaving process.

Terry loom with pile warp length compensation and deflection into back shed

A ground warp thread sheet and a pile warp thread sheet are supplied to a shed forming device. Two stop motions on separate planes respectively monitor the pile warp and the ground warp. The ground warp and the pile warp are deflected over a deflecting rod upstream from the shed forming device. The deflecting rod supports the ground warp and directs the pile warp to cross and interpenetrate through the ground warp before being deflected into the back shed. The vertices of the ground warp and pile warp back sheds are thus located on opposite sides of the deflecting rod. The pile warp crosses through the ground warp directly upstream from the deflecting rod, at a steep angle, for example from 45 to 135 &deg;.

Terry loom with interpenetrating ground warp and pile warp

A leno ground fabric is produced over the entire weaving width of a loom by using two heald frames each having a length corresponding to the weaving width. The heald frames are equipped with a multitude of lifting healds or heddles and with a multitude of half healds or heddles that move the leno warp thread and the ground warp threads for the shed formation over the entire loom width.

Method and weaving loom for producing a leno ground fabric

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 weaving machine with pneumatic weft insertion is provided which includes a fixed reed filler at an output end of a reed when it is in a weft insertion position. A catch salvage forming device is disposed at an output end of the fixed reed filler when the reed is in the weft insertion position and serves to keep the inserted weft stretched during movements of the reed between a weft insertion and a beating up position. In order to shorten the overall length of the assembly, a weft stop motion for detecting the insertion of the weft is located on the fixed reed filler.

Weaving machine with pneumatic weft insertion and catch selvedge forming device

The starting time of a weft thread insertion in a jet loom is automatically adapted to a change in the speed of the main loom drive shaft, in order to assure that the leading end of the weft thread always arrives at the same time at a weft stop motion device at an exit end of a weft insertion channel through the loom shed. For this purpose, the starting time of the weft insertion is advanced when the loom drive shaft rpm is increased and delayed when the rpm is decreased. The advance or delay has reference to a weaving cycle that begins with the opening of a shed and ends when the shed is fully closed. The flight time .DELTA.t.sub.F of a weft thread through the shed is constant. The adaptation is performed in response to measuring the rotational drive shaft angle .alpha..sub.AR at which a weft thread arrives at the weft stop motion device and determining the starting time in such a way that the weft arrival time (t.sub.2, t.sub.4, t.sub.6) always takes place at substantially the same rotational drive shaft angle .alpha..sub.AR.

Method and apparatus for determining the starting time of the weft

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

A multi-section reed for a pneumatic loom includes at least two partial reeds or reed sections that are arranged spaced apart from one another, and a respective reed filler member arranged in the gap between the two reed sections. A substantially continuous or through-going weft insertion air channel is formed by individual air channel sections that are respectively provided in the individual reed sections and reed filler member and that are substantially aligned with each other. In a transition region between a first air channel section and a second consecutive or following air channel section, an inlet end of the second air channel section is enlarged or widened in a funnel-shaped or tapering configuration relative to the cross-sectional dimension of the remainder of the weft insertion air channel, and particularly the outlet end of the first air channel section. The enlarged tapering inlet end of the air channel section provides a smooth transition allowing the inserted weft thread to travel without interference from one reed member to the next, even if the reed members are slightly out of alignment with each other.

Multi-section reed for air jet 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 weaving loom for producing at least one woven fabric web (9) with at least one laid-in selvage includes a weft thread cutting device (23) and an associated selvage laying-in device (14). The cutting device and the laying-in device are mounted relative to the loom machine frame so as to be adjustably movable across the width of the loom along a spreader table (11) with its associated spreader devices (10, 12, 26) and then selectively fixed at any desired width-wise position. The cutting device and the associated laying-in device can be arranged to be independently adjustable, or can be mounted on a common support member, so as to be adjustable in common or in unison with each other across the width of the loom.

Weaving loom with a combination of a weft thread cutting device and a

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

An air weaving loom is equipped with a reed in which the weft thread insertion channel has an inlet channel section and an outlet channel section. Both the inlet and outlet sections have enlarged cross-sectional areas to provide space for the operation of a respective hold-down member that keeps the weft thread in position when the ends (8A) of the weft thread (8), after cutting at the inlet end, are blown back into the selvage formation by respective nozzles (20) that cooperate with the respective hold-down member (2).

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Wangen, Germany

Peter Czura