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Method of Operating an Electronic Dobby Loom

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Method of Operating an Electronic Dobby Loom Patentamt JEuropaischesEuropean Patent Office Office europeen des brevets © Publication number : 0 466 636 A1 @ EUROPEAN PATENT APPLICATION @ Application number: 91810415.9 @ Int. CI.5: D03C 1/14, D03D 51/00 (22) Date of filing : 31.05.91 (30) Priority : 04.06.90 JP 144346/90 (72) Inventor : Honda, Hiroshi, c/o Kabushiki Kaisha Toyoda Jidoshokki Seisakusho, 1, Toyoda-cho @ Date of publication of application : 2-chome 15.01.92 Bulletin 92/03 Kariya-shi, Aichi-ken (JP) @ Designated Contracting States : @ Representative : Hammer, Bruno BE DE FR IT c/o Gebrueder Sulzer AG KSR/Patente/0007, Postfach CH-8401 Winterthur (CH) (R) Applicant : Kabushiki Kaisha Toyoda Jidoshokki Seisakusho 1, Toyoda-cho 2-chome, Kariya-shi Aichi-ken 448 (JP) (54) Method of operating an electronic dobby loom. (57) According to the method the heddle frames (5) of the loom are selected and assigned to a plurality of groups. In each of a plurality of picking cycles a group of heddle frames (5) is moved and leveled into the weaving position (up arrow, down arrow) according to the weaving pattern to be woven. During this operation the loom is preferably run at lower speed compared to the selected normal picking speed. This allows for avoiding excessive load of the drive motor and further remarkably reduces warp yarn breakes. The method thus provides for remarkably improved start up conditions of looms. < CO CO CO CO CO "<t o Q_ LU Jouve, 18, rue Saint-Denis, 75001 PARIS ' 1 g. 1 fig. I A) _ , , ncK Number H. F NO. , 2 3 | - 5 OFF — 6-10 OFF — — OFF *- — *- L I 2 3 4 5 6 7 b y IU II ic lOi'riJiD hi. h NO. 1 EP 0 466 636 A1 2 The present invention relates to a method of to shift the heddle frames of each group selectively, operating an electronic dobby loom and, more particu- and it is impossible to control the load properly during larly, to a method of operating an electronic dobby the leveling operation because the large power loom capable of controlling a plurality of heddle required for shifting the heddle frames from the level- frames urged toward a first shedding position accord- 5 ing position to the shedding position cannot be ing to a program stored in a storage device so that the reduced. heddle frames are shifted to a second shedding posi- Furthermore, it is dangerous and many warps are tion or a split shedding position. broken in leveling the heddle frames and in starting In mounting heddle frames on a dobby loom, as the loom after leveling the heddle frames to the level- well as an those not equipped with any dobby, or in 10 ing position, because of the loom is operated at the full drafting warps through heddles, all the heddle frames speed or at a highest possible speed. are arranged for leveling on a fixed level to facilitate The present invention has been made to solve the the work for mounting the heddle frames on the loom foregoing problems and it is therefore an object of the or for drafting warps through the heddles of the heddle present invention to provide a method of operating an frames. 15 electronic dobby loom in leveling the heddle frames Particularly, when all the heddle frames are urged and in starting the loom after leveling the heddle toward a first shedding position for negative shedding, frames, at a safe, low speed without excessively load- all the hedle frames, in general, are released free so ing the drive motor. that all the heddle frames are arranged at the first According to the present invention this problem is shedding position. However, in some case, the heddle 20 solved by the teaching contained in claim 1. The frames must be leveled at a second shedding position depending claims are related to particular embodi- opposite the first shedding position or at a split-shed- ments of the invention. ding position. If all the heddle frames are shifted sim- As described, to achive the object, the present ultaneously in such a case, load on the loom, invention provides a method of operating an elec- particularly on the drive motor, is excessively large. 25 tronic dobby loom equipped capable of controlling the Therefore, the heddle frames are divided, for shedding motion of a plurality of heddle frames urged example, into four groups, i.e., toward a first shedding position according to a prog- a first group of the first to the fifth heddle ram previously stored in a storage device so that the frames, heddle frames are shifted to a second shedding posi- a second group of the first to the ninth heddle 30 tion or to a split-shedding position. frames, According to the method the heddle frames are a third group of the first to the twelfth heddle shifted in groups of a plurality of heddle frames, and frames and against the force urging the heddle frames toward the a fourth group of the first to the sixteenth hed- first shedding position, to the second shedding posi- dle frames, 35 tion, or to the split-shedding position in a plurality of and the heddle frames are shifted sequentially in four shedding cycles one group of heddle frames in each shedding cycles one group of heddle frames in each shedding cycle in leveling the heddle frames and in shedding cycle to reduce load on the drive motor. starting the loom. Such a technique is disclosed in JP 60 (Sho)-225342. According to the present invention, the heddle Incidentally, in shifting the heddle frames of an elec- 40 frames are shifted in a plurality of groups in a plurality tronic dobby loom to a leveling position for leveling, of picking cycles in shifting the heddle frames against the loom is operated at a full speed and the power force urging the heddle frames in a direction opposite supplied to the drive motor must be increased to oper- to the shifting direction. Accordingly, the drive motor ate the loom at a high speed for instantaneous level- of the loom is not excessively loaded, the loom can be ing when the drive motor has a capacity insufficient for 45 operated at a low speed for leveling and the loom can the simultaneous leveling of all the heddle frames, be started at a low staring speed, so that the warps are and then, after leveling all the heddle frames simul- not broken. taneously, the loom is started at the full speed or at a Follwing the method of operating an electronic highest possible speed, because it is possible that a dobby loom capable of controlling the shedding large load acts on the drive motor in shifting the hed- so motion of a plurality of heddle frames according to a dle frames from the leveling position to the shedding program and sequence previously stored in a storage position. device, the required and sleeted heddle frames are In the in the forgoing described loom in which the shifted against the force urging the same in groups heddle frames of each group are controlled merely each of a plurality of heddle frames, in a plurality of simultaneously by a control rib formed on the circum- 55 shedding cycles, thereby leveling the heddle frames ference of a control rod, it is impossible to discriminate and staring the loom. the heddle frames according to the weave of a fabric Accordingly, the drive motor is not loaded exces- to be woven on the loom regardless of the group and sively when the number of heddle frames to be shifted 3 3 EP 0 466 636 A1 4 simultaneously in each shedding cycle is determined dobby 2 are in an off state, namely, solenoids 2 are previously taking into consideration the capacity of not energized and the swing levers are not attracted the drive motor, so that the loom can be operated at to the solenoids, the heddle frames 5 are at the upper a comparatively low speed. Since the heddle frames shedding position. Therefore, an over shed is formed are controlled selectively and individually for shed- 5 by energizing some of the solenoids to pull down the ding motion, the heddle frames can be shifted from the corresponding heddle frames 5. leveling position respectively to shedding positions Suppose that a shedding program is designed corresponding to the weave (pattern/design) of a fab- according to a weave diagram shown in Fig. 2(B). The ric to be woven on the loom, the loom can be started heddle frames 5 are controlled by the dobby 2 so as at a comparatively low speed, and hence the fre- 10 to form sheds according to the weave for first to sixth quency of warp breakage when starting the loom can picking cycles. significantly be reduced compared with the frequency In shifting the heddle frames 5 for a leveling cycle of warp breakage in starting the loom by the conven- L, the dobby 2 releases all the heddle frames 5 free tional method. and, consequently, all the heddle frames 5 are shifted A method in a preferred embodiment according to 15 to the over shed position by the springs 8 for so-called the present invention will be described hereinafter as over shed leveling. As shown in Fig. 2(A), first to third applied to an electronic dobby loom with reference to picking cycles are performed with all the heddle the accompanying drawings, which show the follow- frames 5 released free from the control of the dobby ing: 2 for the leveling cycle L in an up leveling mode.
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