Tsudakoma Kogyo Kabushiki Kaisha

Tsudakoma Corp.

Akihiko Nakada

Shigeharu Sawada

Zenji Tamura

Tsutomu Sainen

Katsuhiko Sugita

Akihiko Yamamoto

Hidetomo Yoneda

Masato Matsumoto

Takeshi Satou

Yasunori Oota

Eiji Kawabata

Kenji Sakurada

Tomokazu Ishita

Kazuto Kakutani

A control technique is capable of adjusting a weight of a pile fabric by adjusting consumption of a pile warp at a proper range with a more simplified system. In a pile loom, a tolerance relative to a value associated with consumption of the pile warp is set, and the value associated with consumption of the pile warp is measured during a pile weaving period. If the value associated with consumption of the pile warp exceeds the tolerance, the weaving condition parameter associated with the weight of the pile is corrected in a direction to approach a target value of the weight of a pile fabric.

Method of controlling pile fabric loom

A take-up control system for controlling a take-up motion included in a loom controls the take-up motion according to the diameter of a roll of cloth being woven on the loom so that a proper tension is exerted on the cloth. A take-up controller included in the take-up control system controls a torque-controllable motor for driving a cloth roller to take up the cloth in the roll on the basis of an electric signal representing the diameter of the roll according to a control program to exert a properly adjusted tension on the cloth. The take-up controller can also control an actuator for pressing a pressing member against the circumference of the roll according to weaving conditions, or weaving conditions and the diameter of the roll, to apply a properly adjusted pressure to the roll by the pressing member.

Take-up motion tension and/or pressure control system

A tuck-in apparatus for producing a fastened tuck-in-selvage includes a tuck-in nozzle for injecting air into a warp shed from the outside of a warp array in order to fold back a weft yarn end toward a cloth fell. A selvage-fastening nozzle is disposed adjacent to the cloth fell outside the warp array for causing the weft yarn end folded back by the tuck-in nozzle to extend along the cloth fell. Timing control is provided to provide a first period of air injection from the tuck-in nozzle and a second period of air injection from the selvage-fastening nozzle so that the beginning of the second period is later than the beginning of the first period, and the second period ends before the warp shed is closed.

Weft selvage tuck-in nozzle injection timing apparatus

A split reed has a weaving reed formed by successively arranging dents respectively provided with recesses forming a weft yarn guide path having a back surface, and an auxiliary reed respectively provided with recesses forming a weft yarn guide path having a back surface. The weaving reed and the auxiliary reed are attached to a slay or the respective dents of the weaving reed and the auxiliary reed are formed so that the back surface of the weft yarn guide path of the auxiliary reed is included in a plane behind a plane including the back surface of the weaving reed with respect to the cloth fell of a fabric on the loom when the weaving reed and the auxiliary reed are attached to the slay.

Split reed including a weaving reed and an auxiliary reed having a non-planar guide path

Compared with the method for performing tuck-in operation at each weaving cycle, the method of the present invention makes it possible to increase the number of revolutions of the loom at high speed, to decrease the number of maintenance operations needed for the tuck-in device and to decrease power consumption. Moreover, compared with the method for performing collective tuck-in operation by bringing all wefts inserted into each repeat together, it is possible to improve external appearance of the selvedge of the pile fabric. According to the tuck-in selvedge setting method in a tuck-in device of a shuttleless loom for towel of the present invention, when a pile fabric is woven, tuck-in operations for ends of a plurality of wefts inserted into one repeat for forming a pile fabric are performed by a plurality of times. And in at least one tuck-in operation among these tuck-in operations, ends of a plurality of wefts are collectively brought together, and the last tuck-in operation is carried out in the weaving cycle of a first weft in the next repeat for forming the pile fabric.

Method for a tuck-in selvedge setting in a tuck-in device of a shuttleless loom for towels

In a selvedge forming device, the operation condition for operating at least one of the selvedge forming elements contributing to the selvedge formation is set in advance in correspondence to a weaving condition, and the selvedge forming device is operated in accordance with the weaving condition and the operating condition as set in advance, while the weaving process goes on.

Method and apparatus for driving selvedge forming device in weaving machine

A weft holding device transfers a weft to a tuck-in device that tucks and end portion of the weft cut by a weft cutter in a shed formed by warps. The weft holding device has a slit opening backward toward a reed, the warps and the cutter to receive a portion of the weft beaten up by the reed, and a releasing hole connected to the closed end of the slit so as to jet air toward the open end of the slit to move the portion of the weft toward the open end of the slit. Air is jetted through the releasing hole in response to a command signal provided by a loom upon the detection of a mispicked weft to move the mispicked weft to be beaten up backward away from a cutting region in which the weft cutter cuts the weft.

Weft holder for selvedge tuck-in device

A pile forming apparatus of the type where piles are formed in cloth through movement of the cloth between a first position wherein piles are formed and a second position wherein piles are not formed. The apparatus includes a driving mechanism operated in synchronism with rotation of the main shaft of a loom, a transmission mechanism, and a cloth moving device, wherein the motion of the driving mechanism is transmitted to the cloth moving member by the transmission mechanism. The transmission mechanism includes a pair of swing levers connected with each other by a connection body such that the connecting position therebetween is made variable. One of paired swing levers is driven by the driving mechanism and the other is coupled with the cloth moving member. The connecting position between at least one of paired swing levers and the connection body is changed from at least the first position corresponding to an effective lever length enabling piles to be formed, to the second position corresponding to the effective lever length unable to form any pile, or vice versa according to a weaving plan or design. The connection between the swing levers and the driving mechanism enable the driving mechanism to receive and withstand the load applied to the entire system.

Cloth moving type pile forming apparatus

A picking method and apparatus for a multicolor picking loom to provide changes in the number of rotations of the loom in order to pick a desired weft. In particular, a signal generation unit outputs a weft selection signal for each weft corresponding to a picking number, and a number-of-rotations selection signal also corresponding to a picking number. A plurality of number-of-rotations patterns are preset and each pattern corresponds to one of the number-of-rotations selection signals. In addition, a plurality of picking conditions are preset which correspond to the particular weft selection signal for the selected weft and to one of the number-of-rotations patterns. Of the plurality of picking conditions, the picking condition is selected which corresponds to the weft selection signal and the number-of-rotations selection signal, which allows the desired and selected weft to be picked.

Picking method and apparatus for multicolor picking loom

In a tuck-in selvage forming device for a high speed loom, a weft holder with a cutter, hereinafter referred to as a 'capturing-cutting head', is connected via a transmission system to a drive source of the loom. The capturing-cutting head reciprocates between an operative position and a stand-by position in synchronism with the running of the loom. By operation of a spring inserted in the transmission system, the capturing-cutting head is biased toward the operative position. A stopper activated by a faulty weft signal disenables the spring, so that the capturing-cutting head is held in the stand-by position, i.e., so that reciprocation of the capturing-cutting head is prevented despite continued operation of the drive source.

Tuck-in selvage forming device for a loom

A pile warp tension controller for controlling the pile warp yarn tension control mechanism of a pile fabric loom controls the position of the tension roller of the pile warp yarn tension control mechanism or the torque acting on a tension lever supporting the tension roller according to the operating state of the pile fabric loom so that the tension of the pile warp yarns is regulated at an optimum value. The control mode of the pile warp tension controller is changed over from a tension control mode to a speed control mode in forming loops of the pile warp yarns to ensure the satisfactory formation of loops having a predetermined loop length and to prevent defective loops.

Pile warp yarn tension control

A warp tension control method by which the let-off motion of a loom is controlled to regulate the tension of the warp yarns. A force of the same dimension as the controlled variable, namely, the tension of the warp yarns, is applied to a mechanism supporting the tension roller of the let-off motion for displacement under the control of an electric control system to control the warp tension at a high accuracy.

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Kanazawa, Japan

Akihiko Nakada