A REED DRAWING-IN METHOD OF LOOMS AND AN APPARATUS USED IN THE SAME

Abstract: The present invention is to provide both a method whereby a warp thread can be properly and smoothly drawn in a respective gap between adjoining dents of even an extremely high-density reed (R) without being cut off during reed drawing-in operation and a threader can stand a longer use and an apparatus used in the same method. That is to say, when the work carrier (WC) sequentially stops at a respective gap between adjoining dents of the reed (R) while it is moving towards the latitudinal direction of said reed, a gap opener (21) carried on the work carrier (WC) temporarily enlarges a target gap and a threader (23) thrusts in the enlarged gap so as to hook a warp thread (W) sorted out from a thread supply (W.W...) section and draw said thread into the reed (R).

Description: DESCRIPTION A REED DRAWING-IN METHOD OF LOOMS AND AN APPARATUS USED IN THE SAME TECHNICAL FIELD The present invention relates to a method of drawing a warp thread in a reed of looms and a reed drawing-in apparatus used in the same method, more in details, it relates to said method and apparatus wherein not only a warp thread can be properly and smoothly drawn in a respective gap between adjoining dents even of a reed where the dents are laid with extremely high density without being cut off during reed drawing-in operation, but also a threader for hooking a warp thread and drawing it in the reed can stand a longer use. It is a state-of-the-art invention serving to streamline a reed drawing-in job especially for the production of high-density fabrics. BACKGROUND ART Recently, as a plotting scale for manufacturing electronic parts, much attention is drawn to a plain fabric woven by accurately intercrossing weft and warp threads of extremely thin status with a precisely equal interval placed between adjoining threads like a plotting paper. However, in order to weave this type of fabric, a high- density reed must be used in which a number of dents in some extreme cases reaching 400 dents/inch are finely and densely disposed. With the prior reed drawing-in apparatus, it was impossible to draw a warp thread in such a high-density reed as mentioned above. Thus, a warp threading into such a high-density reed could not help depending on manual labor by an experienced and skillful worker. In view of the above-mentioned inconveniences, an apparatus has been proposed in Japanese Patent Application Laid-Open No.61-502472 wherein a gap between adjoining dents is searched and a warp thread is mechanically drawn in said gap. However, with such a prior apparatus as mentioned above, it can search said gap well, but the issue remains unsolved where an extremely thin warp thread should be smoothly drawn in said gap without doing damage on said warp thread so that it is still far from industrial applicability. On the other hand, the present applicant has proposed a high- precision reed drawing-in apparatus in Japanese Patent Publication No.8-16301 comprising a search light source irradiating search light on a reed and a CCD camera picturing the reed surface irradiated with the search light and a microcomputer for calculating the distance to a target gap between adjoining dents on the basis of a picture signal output by said CCD camera and then for outputting a numerical moving command signal in proportion to the calculated distance and a threader having a hook port which is formed thinner than a gap between adjoining dents of the reed wherein the hook port thrusts in the gap so as to hook a warp thread and draw it in said gap, and a work carrier carrying said search light source, CCD camera, microcomputer and threader which sequentially shifts one gap to another on the reed in accordance with said numerical moving command signal so as to draw a warp thread in a target gap with the hook port of the threader. With this apparatus, because of the precisely associated movement between the accurately shifting work carrier and the thin hook port of the threader in reed drawing-in operation, it has become possible to properly draw a warp thread in even a high-density reed with 300 dents/inch. However, even with the high-precision reed drawing-in apparatus as mentioned right above, according as the density of dents becomes higher such as 400 dents/inch, the hook port of the threader must be thinner and thinner. Therefore, the tip end of the hook port trembles under the influence of vibration and so on, vulnerably inviting the drawing-in error of the warp thread or the breakup of the hook port so that the operation is frequently suspended and a number of broken hook ports should be replaced. DISCLOSURE OF THE INVENTION In view of the above-men ioned problems encountered in the reed drawing-in apparatus described in Japanese Patent Publication No.8-16301 and proposed by the present applicant, the present invention is to solve those problems and to provide both a reed drawing-in method whereby a warp thread can be properly and smoothly drawn in a respective gap between adjoining dents of even an extremely high-density reed without being cut off during reed drawing-in operation so that the operation is hardly suspended and a high-precision apparatus used in the same method. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic plan view of the reed drawing-in apparatus embodied in the present invention; Figure 2 is a schematic sectional view of the work carrier carrying a CCD camera, a beam source, a gap opener and a threader; Figure 3 is a fragmentary enlarged sectional view of the work carrier showing the motions of a gap opener and a threader embodied in the present invention; Figure 4 is an enlarged perspective view of a warp thread suction tensioner excluding the beam source of Figure l;Figure 5 is a fragmentary enlarged view of a warp thread selector of the work carrier showing that said selector hooks a warp thread sorted out from a warp thread holder and draws said thread toward the delivery position; Figure 6 is a fragmentary enlarged view of a warp thread cutter and a warp thread manipulator of the work carrier showing that said cutter cuts off a warp thread and said manipulator picks up said cut-off thread;Figure 7 is a block diagram showing the three-way control signal flow among a microcomputer, a CCD camera and a servomotor embodied in the present invention; Figure 8 is a perspective view of the gap opener and the threader embodied in the present invention seen from the underside of the reed showing the state thereof immediately before the sharp-pointed pin of the gap opener projects through the reed; Figure 9 is a perspective view of the gap opener and the threader embodied in the present invention seen from the underside of the reed showing the state thereof where the sharp-pointed pin of the gap opener thrusts in a target gap of the reed so as to enlarge said gap and the threader starts projecting through the enlarged gap; Figure 10 is a perspective view of the gap opener and the threader embodied in the present invention seen from the underside of the reed showing the state thereof where the threader has thrusted in the target gap enlarged by the sharp-pointed pin; Figure 11 is a bird's-eye view of the gap opener and the threader embodied in the present invention showing the state thereof where the hook port of the threader has come up a little above the reed; Figure 12 is a graphical representation showing the waveform of the picture signal output by the CCD camera in accordance with the intensity of search light irradiated from the beam source before the smoothing of said picture signal; Figure 13 is a graphical representation showing the smoothed waveform of the picture signal of Figure 12; Figure 14 is an explanatory view showing the motional state of the warp thread manipulator immediately before the warp thread picked up by said manipulator is delivered to the threader; Figure 15 is an explanatory view showing the state where the warp thread manipulator rotates so as to carry the warp thread to the delivery position for handing it over to the threader and let it off; Figure 16 is an explanatory view showing the state where the end portion of the warp thread let off by the manipulator has been taken in the warp thread suction tensioner; Figure 17 is a partially perspective view showing the warp thread arrangement mechanism adopted in the reed drawing-in apparatus embodied in the present invention; Figure 18 is a partially perspective view showing the state where the bracket of the warp thread arrangement mechanism has reached at the lowermost position; Figure 19 is a schematic view showing the moving state of the work carrier; and Figure 20 is a flow chart showing the main steps of the reed drawing-in operation embodied in the present invention. BEST MODE FOR CARRYING OUT THE INVENTION The method adopted in the present invention is characterized in that a warp thread held in a thread supply section arranged opposite to the reed of looms is sequentially drawn in a repsective gap by means of the association between "Gap Opening Operation" where the dents disposed in both sides of a respective gap are temporarily and sequentially enlarged by intermittently stopping a work carrier provided with a gap opener and a threader while the work carrier is moving in the latitudinal direction of the reed and "Threader Inserting Operation" where the threader thrusts in the enlarged gap. The apparatus adopted in the present invention is characterized in that the associated movement between a gap opener which temporarily enlarges dents disposed in both sides of a target gap just located at where a work carrier has stopped and a threader which thrusts in the gap enlarged by the gap opener and hooks a warp thread from a thread supply section and draws said warp thread in the enlarged gap is incorporated into the work carrier which sequentially stops in response to a respective gap while moving in the latitudinal direction of the reed. Then, the further comments on the constitution of the present invention are given as follows. First, a work carrier shift is adopted in the present invention for sequentially enlarging the dents disposed in both sides of a repsective gap. This work carrier is under the numerical control of an input moving command signal and sequentially and precisely stops in response to the respective gap while moving in the latitudinal direction of the reed. The precise shift of the work carrier along the reed is realized by means of a beam source, a CCD camera and a microcomputer carried on the carrier. Namely, when the beam source locally irradiates a search beam towards the surface of the reed where a number of dents are disposed, a CCD camera converses light receiving quantity of said search beam varying according to whether there is a dent at a searched area into photoelectricity and output said quantity as a picture signal to a microcomputer. Then, a microcomputer calculates the distance to a target gap existing between adjoining dents on the basis of said picture signal output by said CCD camera and then outputs a numerical moving command signal so as to numerically control a shift motor installed in the work carrier and shift said work carrier to a computed position. Then, a gap opener and a threader are also carried on the work carrier of the present invention. The gap opener is a mechanical part which thrusts in a respective target gap between adjoining dents of the reed just facing at where the work carrier has stopped under the numerical control of an input moving command signal as mentioned above and temporarily enlarges the gap. As a gap opener, a sharp-pointed or lanceolate pin by means of a back-and-forth driving mechanism (e.g. a servomotor and cam mechanism) can be adopted. In this case, the tip end of the pin aims at a gap corresponding to a position where the work carrier has stopped. Turning to the threader, it thrusts in the enlarged gap and hooks a warp thread from the thread supply section arranged opposite to the reed with a hook port provided at its tip end so as to draw said warp thread in the reed. The threader moves associatively with and subsequently to the gap opener also by means of a back-and-forth driving mechanism like a servomotor. Therefore, the hook port is longitudinally arranged on the threader along a gap formed by the reed-dents. However, there is no problem even if the threader moves successively following the motion of the gap opener when the work carrier has stopped. In this connection, it is preferable that the instant the work carrier has stopped at a fixed position under the numerical control of an input moving command signal, the computer receiving the information that the work carrier has stopped successively sends a thrusting signal and a reed drawing-in signal to the driving mechanism of the gap opener and the threader respectively. Hereinafter, the best mode for carrying out the invention is more in details explained. The reed drawing-apparatus preferably embodied in the present invention is structured as shown in the accompanying drawings. The whole movement of a reed drawing-in apparatus (D) embodied in the present invention and shown in the accompanying drawings is achieved substantially as follows. First, a high-density reed (400 dents/inch) (R) is horizontally placed on the apparatus (D). With this apparatus (D), reversely rotatable ball screw (B) driven by a shift control motor (servomotor) (M) is horizontally suspended below said reed (R). Said ball screw (B) engages with a work carrier (WC) so as to make said carrier shift just by a required distance. In addition to a beam source (11), a CCD camera (12), a gap opener (21) and its back-and-forth driving mechanism or a servomotor (22) as well as a threader (23) and its back-and-forth driving mechanism or a servomotor (24) for causing thrust and draw-in movement respectively as shown in Figure 2, a warp thread suction tensioner (31) as shown in Figure 4 and a warp thread manipulator (32), a warp thread cutter (33), a warp thread transport hook (34) and a warp thread selector (35) respectively as shown in Figures 5 and 6, and a warp thread arrangement mechanism (40) as shown in Figures 17 and 18 are all systematically carried on the work carrier (WC) along the transfer passage of the warp thread. Further commenting on the above-mentioned embodiment in accordance with the accompanying drawings, it shows that said beam source (11) and warp thread suction tensioner (31) are placed above the reed (R) arranged on the reed drawing-in apparatus (D) while said CCD camera (12) and threader (23) are opposedly placed below the reed (R) against the beam source (11). And said beam source (11), warp thread suction tensioner (31), CCD camera (12) and threader (23) are all arranged so that they shift together with the work carrier (WC). Accordingly, a gap between adjoining dents of a high-density reed (R) searched by the beam source (11) is picturized in the CCD camera (12) and the picturized gap is analyzed with a microcomputer (C) installed in the work carrier (WC). Then, the analysis data is sent to a servomotor (M) as shown in Figure 7 so that the work carrier (WC) shifts accordingly and reaches a gap between adjoining dents where search light irradiation becomes largest or right below the gap. Then, when the work carrier (WC) has stopped at said gap, said computer (C) emits a thrusting signal to a servomotor (22) of a gap opener (21) so as to actuate the upward projection of a sharp-pointed pin (21a) (a gap opener tip) through a target gap. The projection of the sharp-pointed pin (21a) causes dents in both sides of the gap to separate apart so that the gap becomes enlarged. Then, after the enlargement of the gap, said computer (C) emits a threading signal to a servomotor (24) of a threader (23). The actuation of the threader (23) causes its hook port (2f) to thrust in the gap and project a little above the reed (R) (see Figures 10 and 11). Then, a warp thread (W) is led into the upper side of the reed (R) and the end portion of the thread (W) is drawn into a warp thread suction tensioner (31). This warp thread suction tensioner (31) takes in a warp thread (W) through its suction opening (31a) under a required air suction pressure in engagement with a compressor (not shown in the drawings). The warp thread (W) taken in the tensioner (31) is arranged so that it meets the hook port (2f) projected above the reed (R). This way, when the warp thread (W) is hooked on the hook port (2f), the threader (23) is retreated below the reed (R) by means of a servomotor (24) so that the warp thread (w) is drawn in a gap between adjoining dents of the reed (R). Hereinafter, the concrete constitution realizing the above- mentioned motions of a reed drawing-in apparatus embodied in the present invention is more in details described. A infrared LED (light emitting diode) of super-high luminance is adopted as a beam source (11) to be provided above the reed (R) arranged on the reed drawing-in apparatus (D) embodied in the present invention. This LED is upward rotatably and escapably installed on a bracket (H) hinged with the work carrier (WC). When the reed (R) is arranged on the reed drawing-in apparatus (D), the LED along with a warp thread suction tensioner (31) are sprung up so that they escape to a position not interfering with the reed (R). Then, a CCD camera (12) arranged below the reed (R) is for linear image processing purpose wherein charge coupled elements are aligned in one line parallel with the latitudinal direction of the reed-dents (4096 picture elements:2 /picture element). This camera (12) excites photoelectricity according to the intensity of search light passing the interval between adjoining dents of the reed (R) so as to output a picture signal. The picture signal output by this camera (12) is sent to a microcomputer (C) for smoothing as shown in Figures 12 and 13. Then, as shown in Figure 13, an address (1900) where light receiving quantity has peaked is read as a target gap. With the reed drawing-in apparatus embodied in the present invention, the computer (C) is preliminarily programmed so that it can read the current position of the sharp-pointed pin (21a) of the gap opener (21) and that of the hook port (2f) of the threader (23). Therefore, the computer (C) automatically emits a moving command signal to the work carrier (WC) so as to shift the sharp-pointed pin (21a) and the hook port right below an adjacent gap on the right-hand side of the previously threaded gap. The shift of the sharp-pointed pin (21a) and the hook port (2f) to the latitudinal direction of the reed-dents or the shift thereof to the subsequent gap accompanies that of the work carrier (WC). The carrier (WC) shifts by means of the rotation of a ball screw provided at the lower portion of the reed drawing-in apparatus (D). Thus, rotating a servomotor (M) engaged with the ball screw (B) by a fixed rate (see a control mechanism chart in Figure 7) enables the sharp-pointed pin (21a) and the hook port (2f) to accurately shift to a target gap. And when the ball screw (B) on the basis of a moving command signal output by the computer (C) shifts the work carrier (WC) to a predetermined position or when the sharp-pointed pin (21a) and the hook port (2f) reaches right below a target gap or at the intermidiate position between adjoining dents, the microcomputer (C) emits a thrusting signal to a servomotor (22) of the gap opener (21) so as to project a sharp-pointed pin (a gap opener tip)(21a) above the reed (R). Because the tip of the pin (21a) aims at a target gap, it properly thrusts in the intermidiate position of adjoining dents without colliding with the dents and enlarges the gap. Subsequently, said microcomputer (C) sends a threading signal to the servomotor (24) of the threader (23) so as to actuate said servomotor (24). Because the target gap is already enlarged by the sharp-pointed pin (21a) of the gap opener (21), after the actuation of the servomotor (24), the hook port (2f) smoothly projects through the gap and comes up a little above the reed (R) (see Figure 10). The sharp-pointed pin (21a) of the gap opener (21) provided with the reed drawing-in apparatus embodied in the present invention has a tapered tip the diameter of which at the foot is 2mm and the length of which along the slop-side is 7mm. Because the hook port (2f) of the threader (23) adopted in the reed drawing-in apparatus embodied in the present invention has a tip portion the thinnest part of which is 3 u and the thickest part of which is only 70 and the gap is enlarged by 2mm with the sharp-pointed pin (21a) as mentioned above, and also because the hook port (2f) is accurately carried and positioned just below the intermidiate position between adjoining dents, it can be smoothly and spaciously drawn in a reed even with 400 dents/inch. Then, when the hook port (2f) has reached at the topmost position, the operation by means of each mechanism as described below for hooking a warp thread on the hook port (2f) begins. First, as shown in Figure 1, one warp thread (W) is sorted out from a number of the files of warp threads (W • W • • • • ) orderly arranged in a warp thread holder (51) of the reed drawing-in apparatus (D) by means of the shedding motion of a pair of leasing strings that is not shown in the drawings. A warp thread selector (35) carried on the central parts of the work carrier (WC) catches this sorted warp thread (W) (see Figure 5). Namely, a hook (35a) capable of catching only one warp thread (W) is formed on said warp thread selector (35). When the sorted thread is hooked on the hook (35a), the hook (35a) swings towards the work carrier (WC) so as to draw the sorted thread (W) near a fixed position. Then, when the sorted warp thread (W) hooked on the hook (35a) has shifted to a fixed position towards the work carrier (WC), a warp thread transport hook (34) provided on the selector (35) starts moving. This hook (34) is a warp thread relay mechanism whereby the sorted thread (W) hooked on the selector (35) is shifted to a position where a warp thread manipulator (32) can pick up the warp thread (W) and consists of a hook member horizontally moving to and fro as shown in Figures 5 and 6. This way, the sorted warp thread (W) transported by the warp thread transport hook (34) is delivered to the manipulator (32). The warp thread manipulator (32) has a pair of forks (32a) and (32b) between which the warp thread (W) transported from the selector (35) is put. Then, the warp thread (W) put between said forks (32a) and (32b) is scissored at a fixed location with blades (3e) and (3e) of a warp thread cutter (33) (see Figure 6) and the manipulator (32) revolves around a support axis (32c) in the direction of the arrow indicated in Figure 14 with the warp thread (W) put between the forks (32a) and (32b) so as to carry the warp thread (W) to the delivery position (see Figure 15). The warp thread (W) picked up and carried to the delivery position by the manipulator (32) with its forks (32a) and (32b), as shown in Figure 15, is taken in the warp thread suction tensioner (31) by air suction pressure so that it can be held stable while being hooked on the hook port (2f) of the threader (21). After the completion of the delivery, as shown in Figure 16, the manipulator (32) further proceeds to revolve around the support axis (32c) and returns to the original position. Then, the end portion of the warp thread (W) hooked on the hook port (2f) is further taken in the suction tensioner (31) so that it is held taut and straight. Because the suction opening (31a) of the warp thread suction tensioner (31) is formed flatly compressed in the direction of the hook port (2f) and also has a deep-cut slit (31b) formed in the direction of the forks (32a) and (32b) of the manipulator (32) which has arrived at the delivery position, even if the warp thread (W) is partly slack when the forks (32a) and (32b) have picked up and carried it, its end portion is taken in and pulled into the suction opening (31a) so that it is held taut and stable. After the completion of a series of associated motions of each mechanism such as the above-mentioned warp thread selector (35), warp thread cutter (33) and warp thread transport hook (34) at the thread supply section of the reed drawing-in apparatus embodied in the present invention for the purpose of sorting out a warp thread from the files of warp threads (W* W • • ) and supplying it to the delivery position, the threading signal output by the microcomputer (C) switches the servomotor (24) of the threader (23) to the return mode. Then, while the warp thread (W) hooked on the hook port (2f) is still held suffciently taut, it slips out of the suction opening (31a) against air suction pressure of the warp thread suction tensioner (31) and threads through the gap and is discharged from the hook port (2f) below the reed (R). Then, after the hook port (2f) has been retreated downwards from the enlarged gap of the reed-dents, the servomotor (22) of the gap opener (21) is also switched to the return mode so that the sharp- pointed pin (21a) is retreated downwards from the enlarged gap of the reed-dents. On the retreat of the sharp-pointed pin (21a), the reed- dents elastically recovers. It should be noted that the same warp thread arrangement mechanism is adopted in the present invention as disclosed in Japanese Patent Publication No.8-16301 "A reed drawing-in apparatus of looms" proposed by the present applicant. Namely, a warp thread arrangement mechanism (40) whereby a cut-off warp thread is orderly arranged is provided below the reed (R) so that a warp thread drawn in the reed-dents gives any trouble neither to the search of a target gap nor to the operation of the gap opener (21) and the threader (23) respectively. Here, on the safe side of it, this warp thread arrangement mechanism (40) is explained more in details in reference to Figs. 17 and 18. When a newly sorted warp thread (W) is drawn in a gap of the reed- dents, a warp thread receiving bracket (42) for bundling warp threads (W) lowers according to the rotational angle of a cam (43). Then, a swing arm (41) horizontally moving to and fro by means of a boss (44a) of a crank plate (44) rotates above the bracket (42) and brushes aside a newly drawn-in warp thread (W) from the underside of the reed (R). The bracket (42) turns to rise so that it raises a bundle of warp threads including a warp thread (W) newly drawn-in and put aside and then the swing arm (41) returns to the original position passing under the bracket (42). Following the warp thread arrangement as mentioned right above, the microcomputer (C) calculates the distance between the gap where the previously drawn-in warp thread (W) is and an adjoining gap or a target gap on the right-hand side of said previously drawn-in gap so as to command the work carrier (WC) to shift to said target gap. In this way, sequentially drawing a warp thread (W) in the reed-dents enables successive reed drawing-in operation. Another point to be emphasized regarding the embodiment of the present invention is that in order to securely hook a warp thread on the warp thread selector (35) from the warp thread holder (51), two sensors (52) and (53) are provided on the selector (35) in the direction of the files of warp threads (W • W • • • ) as shown in Figure 1 and are arranged so that a headmost warp thread (W) approaches to the sensor (52) farther from the selector (35). This point is explained more in details as follows. The warp thread holder (51) for orderly holding the files of warp threads (W • W • • • ) slides to and fro against the selector (35) by means of rack and pinion which is not shown in the drawings. The selector (35) carried on the work carrier (WC) also slides towards the files of warp threads (W) arranged in the holder (51) during the reed drawing-in operation in response to the driving of the servomotor (M). In this case, when the density of the files of warp threads (W) is low and the headmost warp thread (W) is apart from a position where it can be detected with the sensor (52) because the selector (35) slides too little, the holder (51) is sudden towards the selector (35) by moving said rack and pinion one pitch at a time. On the contrary, when the density of the files of warp threads is high and the headmost warp thread (W) has reached to a position where it can be detected with the sensor (53) because the selector (35) slides too much, the holder (51) including the files of warp threads is retreated by means of said rack and pinion. As a result of repeated experiments with the reed drawing-in apparatus embodied in the present invention, it has been confirmed that said apparatus can cope with even a high-density reed (R) with 400 dents/inch without interrupting reed drawing-in operation at all. Finally, a series of reed drawing-in operation is chronologically explained as follows in reference to Figures 19 and 20. First, the microcomputer (C) installed in the work carrier (WC) confirms by analyzing a picture signal output by the CCD camera that the work carrier (WC) is set on a predetermined starting point (0) of the ball screw (B) (step "a" of Figure 20). Then, the work carrier (WC) is shifted from the starting point (0) to a reed drawing-in initial point (S) of the reed (R) (step "b" of Figure 20). This initial point (S) is located at a gap in one of the two marginal regions between low-density areas (RL) formed at both sides of the reed (R) and a high-density area (RH) interposed between said low-density areas (RL) while the ultimate point (E) is located at a gap in the other marginal region. Then, the microcomputer (C) installed in the work carrier (WC) analyzes and detects the position of the first gap and shifts the work carrier (WC) just below said gap under the numerical control and stops it (step "c" of Figure 20). When the sharp-pointed pin (21a) of the gap opener (21) projects through the target gap at where the work carrier (WC) has stopped, the dents disposed in both sides of the gap separate apart so that said gap is enlarged (step "d" of Figure 20). The hook port (2f) of the threader (23) thrusts in the enlarged gap so that it projects a little above the reed (R) (step "e" of Figure 20). One warp thread (W) is sorted out from the files of warp threads (W* W • • ) (step "f" of Figure 20) and this sorted thread is subject to air suction pressure while being hooked on the hook port (2f) of the threader (23) (step "g" of Figure 20). Thereafter, the warp thread (W) is drawn in the gap of the reed-dents by retreating the threader (23) below the reed (R) (step "h" of Figure 20). After the sharp-pointed pin (21a) of the gap opener (21) has been retreated below the reed (R) (step "i" of Figure 20) and the warp thread (W) hooked on the hook port (2f) has been unhooked (step "j" of Figure 20), one cycle of reed drawing-in operation is completed (step "k" of Figure 20). Then, the microcomputer (C) reads whether there is a gap left or not and if so, the same reed drawing-in operation as mentioned above is performed on an adjoining gap (see "N" route in step "k" of Figure 20). Otherwise or when the work carrier (WC) has shifted to the ultimate point (E) of the reed (R), all the reed drawing-in operation is over and the work carrier (WC) is retreated to the starting point (0) (see "Y" route in step "k" of Figure 20). In this regard, whether there is any gap left is read in accordance with the change of waveforms of picture signals output by the CCD camera (refer to Figure 13). In short, said waveforms vary in accordance with the change of the reed- dents density in the two marginal regions between the high-density area (RH) and the low-density areas (RL). Although reed drawing-in operation is performed on all the reed-dents in the high-density area (RH) in the present embodiment, it is also possible to perform said operation by preliminarily programming a given interval between one gap and the next gap in the microcomputer (C). The embodiment of the present invention to be disclosed herein is substantially as described above. However, it should be understood that the present invention is not limited to said embodiment, but can be modified in various ways within the scope of the accompanying claims. For example, two servomotors (22) and (24) are adopted as back- and-forth driving control mechanism for the sharp-pointed pin (21a) of the gap opener (21) and the threader (23) respectively in the present embodiment, but it is also possible to drive them with just one servomotor by causing time lag between the movement of the sharp-pointed pin (21a) and that of the hook port (2f) of the threader (23). It is also possible to adopt driving mechanism by means of fluid pressure such as an air cylinder instead of those two servomotors. The sharp-pointed or lanceolate pin (21a) which is thicker at the foot is adopted as a tip of the gap opener (21) in the present embodiment, but it is also possible to insert an oarlike slat into a gap of adjoining reed-dents and twist said slat in the gap so as to enlarge it. It should be understood that the above-men ioned modifications are only a few examples of modified embodiments in accordance with the working of the present invention, and those modifications are obviously within the technical scope of the present invention. INDUSTRIAL APPLICABILITY As described up to here, with the reed drawing-in apparatus embodied in the present invention, the skillful means is adopted on the basis of the association between "Gap Opening Operation" where the gap opener temporarily enlarges a respective gap by separating apart reed- dents disposed in both sides of the gap and "Threader Inserting Operation" where the threader thrusts in the enlarged gap. Therefore, even when reed drawing-in operation is performed on a high-density reed having an extremely fine gap between adjoining reed-dents, there is no case where the warp thread is damaged or cut off due to excessive stress such as friction during said operation. The reed drawing-in apparatus embodied in the present invention can properly and automatically perform fast reed drawing-in operation even on a high-density reed with more than 400 dents/inch. Therefore, it serves more effectively than the prior art proposed in Japanese Patent Publication No.8-16301 to streamline preparatory work in the factory where a high-density fabric is manufactured so that its industrial applicability is extremely high.

Claims: CLAIMS 1. A method of drawing a warp thread in a gap between adjoining reed- dents of looms comprising the steps of; (a)temporari ly enlarging said gap by intermittently stopping a work carrier provided with a gap opener for enlarging said gap and a threader for drawing a warp thread in the gap while said work carrier is moving in the latitudinal direction of said reed and then by separating apart said dents disposed in both sides of said gap with said gap opener and (b)introducing an appropriate warp thread from a thread supply section arranged opposite to said reed and sequentially drawing said warp thread in a respective gap by thrusting said threader in the enlarged gap. 2. A reed drawing-in apparatus of looms wherein a work carrier sequentially stops at a respective gap between adjoining reed-dents while moving in the latitudinal direction of the reed and a gap opener provided with the work carrier temporarily enlarges the dents disposed in both sides of said gap, and a threader provided with the work carrier thrusts into the enlarged gap so as to hook a warp thread from a thread supply section and draw a warp thread in the reed. 3. A reed drawing-in apparatus of looms provided with a work carrier moving to an aiming position along the latitudinal direction of the reed under the numerical control of an input moving command signal wherein the work carrier comprises a beam source for locally irradiating a search beam towards the surface of the reed where reed-dents are disposed and a CCD camera for conversing light receiving quantity of said search beam varying according to whether there is a dent at a searched area into photoelectricity and outputting said quantity as a picture signal and a microcomputer for calculating the distance to a target gap existing between adjoining dents on the basis of said picture signal output by said CCD camera and then outputting a numerical moving command signal so as to cause said work carrier to set in motion and a gap opener for thrusting in the dents disposed in both sides of a gap just located at where the work carrier under the control of said numerical moving command signal output by said microcomputer has aimed so as to temporarily enlarge said gap, and a threader for thrusting in the gap enlarged by said gap opener and then hooking a warp thread from a thread supply section and drawing said warp thread in the reed. 4. A reed drawing-in apparatus of looms according to claims 2 or 3, wherein the gap opener is provided with a sharp-pointed pin capable of straightly moving back and forth and when the work carrier has reached its aiming position and stopped, said pin thrusts in a target gap by means of a pin driving mechanism and then separates apart the dents disposed in both sides of the gap so as to enlarge said gap, and while said gap is enlarged, a threader thrusts in said gap by means of a threader driving mechanism and hooks a warp thread standing by at the thread supply section so as to draw said warp thread in the reed. 5. A reed drawing-in apparatus of looms as in any one of claims 2-4, wherein a tip of the gap opener and the threader are arranged along a gap between adjoining reed-dents. AMENDED CLAIMS [received by the International Bureau on 07 April 1997 (07.04.97); original claims 2 and 4 cancelled; original claims 1,3 and 5 amended; remaining claims unchanged ( 2 pages) ] 1. A method of drawing a warp yarn into a high-density reed having more than 300 dents/inch on the surface comprising the steps of; locally irradiating superhigh luminance infrared search beam on the surface of said reed; conversing quantity of light of said search beam which varies according to whether there is a dent at a beamed surface into photoelectricity by a CCD camera so as to obtain an amplitude signal; determining a peak location of said amplitude signal by smoothing said signal ; calculating the distance to a target gap between adjoining dents on the basis of said peak location by a microcomputer and then inputting a numerical moving command signal into a work carrier so as to precisely shift said carrier to a reed drawing-in position as required; < enlarging said target gap with a gap opener having a sharp-pointed pin on the tip; and, thrusting a threader in the enlarged gap and hooking a warp yarn from a thread supply section arranged opposite to said reed, thereby, drawing said warp yarn into the reed. 2. A reed drawing-in apparatus for a high-density reed having more than 300 dents/inch provided with a work carrier moving along said reed and shifting to a reed drawing-in position as required under an input numerical moving command signal, said work carrier carrying; (a) an infrared beam source locally irradiating superhigh luminance infrared on the surface of said high-density reed; (b) a CCD camera conversing quantity of light of said beam varying according to whether there is a dent at a beamed surface of the reed into photoelectricity so as to output an amplitude signal; (c) a microcomputer calculating the distance to a target gap AME::DEBSHEET(ARΉCLEI9) between adjoining dents on the basis of a peak location of said amplitude signal determined by smoothing said signal and outputting a numerical moving command signal so as to move said work carrier to a reed drawing-in position as required; (d) a gap opener splitting away adjoining reed-dents by thrusting a sharp-pointed pin of said opener in a gap that the work carrier faces just when said carrier has reached a reed drawing-in position as required under the control of said numerical moving command signal so as to temporarily enlarge said gap; (e) a threader thrusting in said gap while said sharp-pointed pin splits away adjoining reed-dents so as to hook a warp yarn from a thread supply section arranged opposite to said reed and draw said warp yarn into the gap. 3. A reed drawing-in apparatus as claimed in claim 2 wherein the sharp-pointed pin of the gap opener and the threader are arranged one above the other along a gap between adjoining reed-dents. AMENDEDSKEET(ARΗCLEB) STATEMENT UNDER ARTICLE 19 The claim 1 clearly defines that the present invention is intended to properly draw a warp yarn into a high-density reed on the surface of which more than 300 dents per inch are finely disposed, and the present invention has adopted such a series of means as irradiating high- luminance infrared search beam of long wavelength on the surface of said reed; conversing quantity of light of said search beam which varies according to whether there is a dent at a beamed surface into photoelectricity and outputting said quantity of light as an amplitude signal by means of a CCD camera; determining a peak location where there is largest quantity of light by smoothing said signal so as to remove noise; calculating the distance to a target gap between adjacent dents on the basis of said peak location by a microcomputer so as to precisely move a work carrier to a reed drawing-in position as required by means of a numerical moving command signal; enlarging the interval of said target gap with a gap opener of said work carrier reached at said reed drawing-in position; thrusting a threader in the enlarged gap; and hooking a warp yarn from a thread supply section arranged opposite to said reed, thereby, drawing said warp yarn into the reed. The claim 2 clearly defines that the present invention is to provide a high-precision reed drawing-in apparatus capable of drawing a warp yarn in such a high-density reed as disposing more than 300 dents/inch on the surface, and as a means to achieve this purpose it has adopted a work carrier capable of precisely moving along finely aligned reed dents or a fine gap therebetween by means of an input numerical moving command signal. The claim 3 clearly defines that the high-precision reed drawing- in apparatus embodied in the present invention is capable of drawing a warp yarn into a high-density reed by means of an extremely simple back- and-forth movement of both a sharp-pointed pin of the gap opener and the threader arranged one above the other along a respective gap between adjacent dents. Such characteristic feature of the present invention is not disclosed at all in any of the patent references cited in the International Search Report as irradiating high-luminance infrared of long wavelength as a search beam on the surface of high-density reed on which more than 300 dents/inch are finely disposed and outputting quantity of light of said beam slightly varying according to whether there is a dent at a beamed surface as an amplitude signal by a high- density light receiving means or a CCD camera; and properly thrusting a pin of the gap opener in a target gap so as to enlarge said gap and draw a warp yarn into the enlarged gap with a threader by making most use of said amplitude signal or by skillfuly associating said signal with a work carrier. The tip of the gap opener embodied in the present invention is sharp-pointed so that it not only precisely thrusts in a target gap which is extremely narrow in width, but also causes no damage on the reed-dents.

Inventors: HASHIZUME KENJI, SAKAGUCHI YOSHIRO, HASHIZUME, KENJI, SAKAGUCHI, YOSHIRO
Applicants: HASHIZUME KENJI, HASHIZUME KENKYUSHO CO LTD, SAKAGUCHI YOSHIRO, HASHIZUME KENKYUSHO CO., LTD., HASHIZUME, KENJI, SAKAGUCHI, YOSHIRO
Application year: 1996
Main classification: D03J1
IPC codes: D03J1