Abstract: A device for supplying weft threads in airjet weaving machines includes at least one nozzle connected to a compressed air source, a buffer tank, a cutoff valve placed in a funnel between the compressed air source and the nozzle, and a controlled throttling device. The throttling device is mounted downstream from the buffer tank and in the immediate surroundings of the cutoff valve, and includes the funnel, a rotary throttling element, and a motor for rotating the throttling element. The funnel is divided into an inlet funnel and an outlet funnel connected to the inlet funnel. The rotary throttling element fits within the inlet funnel and rotates to selectively block an entry to the outlet funnel according to the degree of rotation of the throttling device.
Type:
Grant
Filed:
February 14, 1991
Date of Patent:
February 11, 1992
Assignee:
Picanol N.V., naamloze vennootschap
Inventors:
Philippe Van Bogaert, Jean-Marie Bamelis, Jozef Peeters, Hugo Markey
Abstract: A device for the removal of dust from parts protecting weaving machine components from weaving dust includes a dust screen, a number of freely movable blowing tubes which direct air from their open ends into an area adjacent the dust screen, and blowing devices for feeding air through the tubes. Removed dust is disposed of by a separate device such as a suction nozzle.
Type:
Grant
Filed:
October 4, 1990
Date of Patent:
December 24, 1991
Assignee:
Picanol N.V.
Inventors:
Henry Shaw, Geert Geerardyn, Bernard Vancayzeele
Abstract: A method for supplying weft threads into the shed of a weaving machine includes the step of controlling at least one of the weaving machine elements which can influence weft insertion times as a function of the reopening of the shed. The method is particularly applicable to weaving machines of the type in which weft threads are inserted by a transport fluid. A device for carrying out the above method includes a computing unit and memory which controls an insertion time influencing element in response to signals related to a moving pattern of the harnesses and information regarding the weft pattern.
Abstract: When a weft thread is not used for weaving for a certain preset time, at least one weft length of this weft thread is automatically inserted into the shed and removed to prevent weaving errors caused because the weft thread is held too long in the insertion nozzle and consequently may be damaged. The weaving process then continues with a new length of new weft thread.
Type:
Grant
Filed:
October 3, 1990
Date of Patent:
September 24, 1991
Assignee:
Picanol N.V.,naamloze vennootschap
Inventors:
Robert Baeck, Dirk Lewyllie, Jose Vangheluwe
Abstract: A weaving machine of the type in which a main shaft is braked by an electromagnetic brake has, in addition to the brake, a lock for locking the main shaft against rotation. The lock includes a locking element which meshes into gear teeth of a wheel coupled to the main shaft. The lock is automatically activated when power to the weaving machine fails, and may be deactivated by turning a hand wheel.
Type:
Grant
Filed:
June 29, 1990
Date of Patent:
September 10, 1991
Assignee:
Picanol N.V., naamloze vennootschap
Inventors:
Andre Vandenbroucke, Johny Grimmonprez, Walter Bilcke
Abstract: A device for moving a back rest in weaving machines includes two movable supporting mechanisms between which the back rest is mounted, an eccentric for moving the supporting mechanisms and whose eccentricity can be modified, and a driving wheel for driving the eccentric. A mechanism provided between the driving wheel and the eccentric permits a continuous setting of the phase of the eccentric in relation to the driving wheel. The mechanism includes a seating formed in the driving wheel, an element which fits in the seating and which can be axially turned in relation to the driving wheel to which the eccentric is coupled, and a clamp for clamping the element at any required angular position in the seating.
Type:
Grant
Filed:
July 16, 1990
Date of Patent:
September 3, 1991
Assignee:
Picanol N.V., naamloze vennootschap
Inventors:
Michel Vandeweghe, Bart Levever, Stefaan Vandersyppe
Abstract: A method for collecting dust and waste in weaving machines wherein a continuous waste ribbon is generated during the weaving process includes blowing the dust and waste onto the ribbon while it is being wound on a waste spool to thereby collect and compact the dust and waste matter between ribbon windings. Apparatus for carrying out the method includes a vacuum nozzle arrangement for collecting the dust and waste and a conduit for transporting the aspirated dust and waste to the waste spool while the waste ribbon is being wound thereon. A specific blowing nozzle for carrying the dust and waste to the spool and ribbon, includes a housing arrangement for the waste spool that permits dust and waste not directly deposited on the waste ribbon to be picked up during the ribbon winding process.
Abstract: A method of weaving cloth having a weaving pattern which varies according to which warp threads are supplied and according to which weft threads are bound into the warp threads, includes the steps of forming successive different pattern areas and regulating the warp tension according to a reference value during weaving such that its variation is a function of the different pattern areas to be formed. Control of the reference value is accomplished by determining a reference value for the warp tension as a function of the weaving pattern, and regulating the warp tension by measuring the actual warp tension, comparing the measured warp tension with the reference value, and controlling the motor of the let-off such that the difference between the reference value and the measured warp tension is regulated to zero. A weaving machine is arranged to carry out each of the above method steps.
Abstract: Supporting mechanism for the back rest in a waving machine, consisting of at least two supports which support the back rest at its respective ends, characterized in that each support (11) essentially consists of at least two leaf springs (12, 13) mounted next to one another and attached at one of their ends (14, 15) to one another and to the weaving machine, and which at their opposite ends (16, 17) are also connected with one another in order to support the back rest (3).
Type:
Grant
Filed:
July 16, 1990
Date of Patent:
June 25, 1991
Assignee:
Picanol N.V.
Inventors:
Michel Vandeweghe, Bart Lefever, Stefaan Vandersyppe
Abstract: Attachment for guard plates in weaving machines, characterized in that it essentially consists of at least three couplings (3), each formed by a cylinder-shaped element (4) which is attached to the guard plate (1), and a seating (5) which is mounted to the frame (2) of the weaving machine and which closes flexibly round the cylinder-shaped element (4), whereby at least one coupling (3) is situated at the top of the guard plate (1), whose cylinder-shaped element (4) has a vertical or almost vertical axis (6), and whereby at least two couplings (3) are situated at the bottom of the guard plate (1), whose cylinder-shaped elements (4) have horizontal or almost horizontal axes (7) in line with each other.
Abstract: A thread brake for braking a weft thread in a weaving machine includes a rigid stop and an elastically deformable blade which has a free end supported to press resiliently against the rigid stop. Thread guides are provided to guide weft threads between the rigid stop and the elastically deformable blade. The thread brake is activated when the deformable blade elastically presses against the rigid stop. When contacted by a switching device, however, the elastically deformable blade is pushed against its resilient force and removed from the rigid stop, at least in the region of the switching device, deactivating the thread brake.
Abstract: An airjet weaving machine with a weft thread supply includes a plurality of yarn packages, thread preparation mechanisms, and thread blocking devices on the thread preparation mechanisms. A thread break detector is mounted between the yarn packages and the thread blocking devices. Upon detection of a thread break, a control unit deactivates the thread preparation mechanism in which the thread break has occurred, and thread removal devices are subsequently activated a pre-determined time interval after detection of the thread break so that at least a weft thread section into the main nozzle is removed in order to prevent the broken off piece of weft thread from becoming entangled with other weft threads and thus being blown together with the other weft threads into the shed, or to prevent the broken off piece from blocking other main nozzles.
Abstract: In a weaving machine, one of the guiding elements used to normally guide a weft thread between a thread preparation mechanism and the shed of the weaving machine is made moveable. The moveable guiding element may, for example, be an auxiliary weft insertion nozzle and can be used in place of supplemental threading and guiding mechanisms for such as purposes as retrieving a broken weft thread for automatic rethreading or extracting a defective weft thread from the shed.
Type:
Grant
Filed:
October 3, 1989
Date of Patent:
February 19, 1991
Assignee:
Picanol N.V.
Inventors:
Henry Shaw, Dirk Lewyllie, Jose Vangheluwe
Abstract: A device for supplying weft threads in weaving machines with minimal twisting includes at least one rotatable set of thread supplies and one rotatable set of thread preparation mechanisms per set of thread supplies. The sets of thread preparation mechanisms are rotatable together with corresponding sets of thread supplies forming a rotatable assembly to prevent the weft threads from becoming tangled with one another as the sets rotate, for example to bring one of the thread preparation mechanisms adjacent a repair mechanism, or to change threads. A mechanism is further included which converts the rotational motion of the rotatable assembly into a translational motion essentially in the direction of the axis around which the assembly turns. By a suitable choice of the mechanism, lengthening of the thread after rotation can be fully compensated for by the translational motion of the thread supplies and of the corresponding thread preparation mechanisms.
Abstract: A device for driving harnesses of weaving machines includes at least two driven cam shafts and at least one pair of conjugated cams connected to each other for each shaft. Swivel mounted levers which swivel about a common shaft are mounted alternately and in an opposite sense in relation to adjacent levers, each lever including two cam followers which operate with one of the conjugated cam pairs to provide a positive cam drive for the lever so that the lever oscillates. A transmission converts the oscillating motion of the levers into an up and down of the harnesses.
Abstract: A method for removing a loose incorrectly inserted piece of weft thread from the shed in a weaving machine includes the steps of inserting a weft thread into the shed and transporting it through the shed until it extends over the entire length of the shed in order to from a pulling thread. The loose weft thread is then fastened, outside the shed, to the pulling thread. The pulling thread is drawn together with the piece of weft thread fastened to it from the end of the shed located opposite to the end at which the fastening occurred in such a way that the latter piece of weft thread is removed from the fell line in the form of a loop and thereby removed from the shed.
Abstract: A device for removing a broken warp thread from a warp stop motion includes a plurality of extraction elements that may include nozzles, hooks, grippers and the like that lift a slack loop of broken warp thread at a fallen drop wire associated with the broken warp thread and move the loop to a position outside the stop motion by passing the loop sequentially from one nozzle, etc. to the next in a single direction until the loop is outside the stop motion, where it can be gripped by a thread holder for further manipulation.
Abstract: A method of threading a weft insertion jet nozzle so that a correct length of the leading end of the weft thread extends from the jet nozzle in the direction of the shed includes the steps of bringing a weft thread into its corresponding jet nozzle, inserting at least one weft length of said weft thread into the shed, cutting off the length of weft thread which has been inserted into the shed so that the correct length of weft thread extends from the outlet of the jet nozzle, and finally removing the cut-off length of weft thread from the shed. A weaving machine adapted for carrying out the described method includes a control unit connected to the weaving machine's prewinders, jet nozzles, a suction nozzle, a cutter, and to the drive of the sley of the weaving machine.
Abstract: A mechanism for supplying weft thread to the shed of a weaving machine includes at least three different weft supply mechanisms, at least one of which is arranged to operate with at least two different weft thread sources for the purpose of acting as a reserve thread supply for either of the first two weft thread supply mechanisms.
Abstract: A mechanism for presenting weft threads on rapier weaving machines includes a cam mechanism, cam follower devices, armatures connected to the cam follower devices, and thread presentation arms. The cam mechanism and cam follower devices impart reciprocating movements to the armatures such that, alternately, for each successive weaving cycle, the armature connected to one of the cam follower devices cause the movement of one of the thread presentation arms into a presented position, while the armatures connected to the other cam follower device move back to a rest position a thread presentation arm which has just been presented.
Type:
Grant
Filed:
June 16, 1989
Date of Patent:
October 23, 1990
Assignee:
Picanol N.V.
Inventors:
Philippe Van Bogaert, Denis Moeneclaey, Remi Lagache