JP2773901B2 - Weft storage length measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a drum type weft storage and length measuring device in a fluid jet loom, and particularly, when a loom is accelerated, a weft can be arbitrarily lengthened. The present invention relates to an apparatus which can measure the length of a sheet, and can add a function such as more secure weft insertion or ensuring the quality of cloth.

(Prior Art) A conventional general drum type weft storage and length measuring device measures a length at a fixed position on the outer periphery of a drum supported in a stationary state, as described in, for example, Japanese Patent Application Laid-Open No. 56-29640. While inserting the claw and winding and storing the weft to the weft insertion nozzle behind it, when the beginning of weft insertion arrives, pull out the measuring claw and unwind the weft while unwinding it from the drum. When the predetermined value is reached, the length measuring claw is reinserted to stop the unwinding, so that the weft thread for one weft insertion (one pick) is inserted. Therefore, in this apparatus, the drum diameter must be changed every time the weaving width is changed.

Here, JP-A-59-21749 discloses an apparatus capable of measuring a weft to a desired length without changing a drum diameter.

That is, in this device, a disk which can rotate concentrically with the drum is disposed immediately before the drum, and the stored weft is drawn through a weft hole formed in the outer periphery of the disk by a weft insertion nozzle. Through. Then, during the weft insertion period, the disc is rotated by a predetermined number of times (including a fraction) in the unwinding direction (unwinding direction) by a step motor or the like to unwind a weft of a desired length. is there.

However, this device is extremely difficult to apply to a high-speed loom. The reason will be described by way of example. For example, in the case of an air jet loom, the weft insertion period is set to about one
If the number of unwinds from the drum is now about 3 and therefore the required average rotational speed of the disk is about 9 times the rotational speed of the loom. In addition, taking into account the loss time of the start-up acceleration and deceleration stop of the disk, the required maximum rotation speed is about 2
Double. Therefore, when the machine rotation speed is 600 RPM, the weft insertion period is about 1/30 second, and the required maximum rotation speed is about 10.000 RPM. It is almost impossible to do exactly.

Further, Japanese Patent Application Laid-Open No. Sho 60-28552 describes an apparatus comprising a combination of a length measuring claw and a rotating body as described above. This apparatus will be described with reference to FIG.

The weft storage and length measuring device 10 is assembled on a bracket 3 projecting from the side frame 1 of the loom, and is roughly divided into a storage portion 13 and a length measuring portion 45.

In the storage section 13, a spindle 17 is supported on a bearing 15 attached to the bracket 3, and this spindle is intermittently driven, for example, by a winding motor (not shown) via a toothed belt in a manner described later. Reference numeral 19 denotes a pulley for winding the toothed belt. A drum 31 is supported at the front end of the spindle 17 so as to be relatively rotatable, and the drum 31 is always kept stationary by the action of the weight 33, for example. A circumferential groove 35 is formed near the outer peripheral front end of the drum 31, and a disk 37 having a diameter slightly larger than the outer diameter of the drum front end is attached to the front side of the drum. Circumferential groove
A length measuring claw 61 described later is inserted into the 35 from the outside.

Reference numeral 5 denotes a yarn guide, which is arranged on the center axis of the drum 31 and fixed to the side frame 1. Reference numeral 7 denotes a weft insertion nozzle, which is fixed on a sley 9 for mounting, for example, a reed (not shown), and is directed to a guide path for weft insertion air formed along the reed. The weft W from the yarn supply source passes from the center hole 18 of the spindle 17 through the arm-shaped yarn introduction tube 21 integral with the spindle, and then the guide plate extending from the yarn introduction tube.
It is inserted through a threading hole 25 formed at the outer end of 23, guided to the outside of the rear end of the drum 31, and further passed through the yarn guide 5 to the weft insertion nozzle 7. Therefore, when the spindle 17 is driven to rotate in one direction by the winding motor, the weft W is wound and stored behind the length measuring claw while being locked by the length measuring claw 61, and the stored amount exceeds a predetermined amount exceeding one pick. When the length is reached, the storage amount sensor 39 detects this and stops the winding motor.

Next, in the length measuring section 45, a length measuring ring is provided outside the drum 31 so as to overlap the front portion of the drum.
47 are located. The length measuring ring 47 is, for example, four rollers attached to a holder 51 fixed to the bracket 3.
It is supported concentrically with the drum 31 by being supported by 53, and in this state, it can be rotationally driven via a galling 57 from a ring drive motor, for example, a step motor 55.

An electromagnetic actuator 63 for reciprocatingly driving the photoelectric type weft unwinding sensor 59 and the length measuring claw 61 is provided on the length measuring ring 47.
And have been fixed. The length measuring claw 61 is formed in a pin shape and normally advances toward the drum 31 by the built-in spring of the electromagnetic actuator 63 and is inserted into the circumferential groove 35. When the electromagnetic actuator is excited, it is pulled out from the circumferential groove. Retreat into this actuator. The exciting power of the electromagnetic actuator 63 is supplied from the brush 65 via a slip ring 67 fixed to the length measuring ring 47, and further via a brush 69. The power supply to the weft unwinding sensor 59 and the signal transmission path are the same, so that the illustration is omitted.

To explain the operation, when the weft insertion start approaches, the weft insertion nozzle 7 precedes the injection of air, and power is supplied to the electromagnetic actuator 63 at the same time as the start. As a result, the length measuring claw 61 is pulled out from the circumferential groove 35 and the above-mentioned locking is released, so that the weft wound and stored on the drum 31 is pulled by the jet airflow from the weft insertion nozzle 7 and the disc 37 The unwinding sensor 59 detects the unwinding sensor 59 every time the weft passes once, and a counter (not shown) counts this detection signal. Then, when the counted value reaches a predetermined value, for example, 3 and the power supply to the electromagnetic actuator 63 is stopped and demagnetized, the length measuring claw 61 is reinserted into the circumferential groove 35, and the weft that has been turned is applied to this length measuring claw. It is re-locked and the length measurement ends.

That is, the weft for one pick is measured here and sent to the weft insertion nozzle 7. At this time, if the length measuring ring 47 is kept stationary, the length measured is an integral multiple of the drum circumference. Also, if you want to measure the length more than this due to a change in weaving width, for example, if you want to augment the measured length by 1/3 of the drum circumference, pull out the measuring claw 61 and then remove it. The length measuring ring 47 may be rotated by 1/3 in the unwinding direction before reinsertion. Therefore, according to this apparatus, the length measurement can be changed as desired only by rotating the length measurement ring within a small angle range.

According to the weft storage and length measuring device 10, only by rotating the length measuring ring within a small angle range during a long period of measurement, that is, it is possible to change the length measurement amount without giving a large angular velocity. Even when applied to a high-speed loom, the rotation of the rotating ring can be extremely easily controlled.

(Problems to be Solved by the Invention) In recent years, as the speed of a weaving machine has increased, the time available for weft insertion has become shorter, and it is necessary to increase the weft speed. To reduce the time from the end of weft insertion to the time of beating.Therefore, it is necessary to keep the weft tension at the time when the woven fabric is formed at an appropriate value. It becomes difficult, and the quality of the woven fabric may not be secured. In particular, in the case of multicolor weaving, there is a possibility that weft insertion may not be performed reliably due to the influence of weft yarns projecting from the weft insertion nozzle tip. For this reason, there has been a demand that weft insertion can be performed reliably when the speed of the loom is increased, and that the cloth quality is sufficiently ensured.

However, in the weft storage and length measuring device 10 as shown in FIG. 8, when the loom is accelerated, the operation is reliable and the weaving width can be easily changed, but the operation is performed after the length measuring claw 61 is pulled out. The length measuring ring 47 is rotated in the unwinding direction and stopped until it is reinserted, and then the weft is locked to terminate the length measurement. That is, since the position control of the length measuring claw is performed during the period when the length measuring claw does not lock the weft, the length measuring ring 47 is stopped at the predetermined position when the length measuring claw locks the weft. For this reason, except that the weaving width can be easily changed, the function remains the same as that of a normal length measuring device.Therefore, as described above, it is necessary to prevent a weft insertion defect from occurring or a drop in the quality of the cloth. It is necessary to provide a new device having a function for that purpose, for example, to provide a pin or the like that can contact the weft between the weft storage and length measuring device 10 and the weft insertion nozzle 7, and to attach to the weft at the end of the weft insertion On the other hand, the pins are brought into contact with each other for braking, tension is applied at the time of beating, or after the beating, the weft projecting from the tip of the weft insertion nozzle by the pins is pulled back to the weft insertion nozzle 7 side. It was necessary to install the device and control its operation.

However, when such a device is newly installed, the cost of the weft insertion device increases, and the device becomes complicated, which may impair operability and maintainability.

Therefore, an object of the present invention is to increase the speed of a loom,
The weaving width can be easily changed, and without adding a new complicated device, braking is applied when the weft is locked to prevent thread breakage, and the appropriate tension is applied at the time of beating to improve the cloth quality. It is an object of the present invention to provide a weft storage and length measuring device which can add a function such as securing the weft or pulling back the weft after beating.

[Configuration of the invention]

(Means for Solving the Problems) The means of the present invention for solving the problems is configured as follows.

That is, a first means of the present invention comprises a drum for winding and storing a weft so that it can be unwound, a length measuring ring concentric with the drum, and a ring drive for rotating the length measuring ring. What is claimed is: 1. A weft storage and length measuring device comprising: a motor; and a length measuring claw that is reciprocally driven from an electromagnetic actuator supported by a length measuring ring, advances to a drum side, and locks the weft so that the weft cannot be unwound. And a feeding means for feeding power to the weft insertion period, and advance the length measuring claw by the end of the weft insertion period, and move the length measuring claw to the next weft engaging position while controlling the speed thereof in advance. Control means for performing power supply control to the electromagnetic actuator and rotation control of the ring drive motor in accordance with a control pattern.

Further, the second means of the present invention is such that, after the control pattern has brought the length measuring claw to a position in front of the next weft engaging position, in the unwinding direction of the weft from this position, and This is to rotate forward to the above-mentioned locking position at a rotation angular velocity smaller than the weft rotation angular velocity associated with unwinding, and to advance the length measuring claw on the way to this locking position.

Further, the third means of the present invention, the control means in the first or second means, at a predetermined position before beating,
It also has a function of controlling the rotation of a ring drive motor in order to rotate the length measuring ring forward or backward in accordance with a rotation direction and a rotation angle planned in advance to correct the tension of the weft.

Still further, the fourth means of the present invention is such that the control means in the first, second, or third means controls the ring drive motor to reverse the length measurement ring by a predetermined rotation angle after beating. It also has a function of performing rotation control.

(Operation) According to the first means, the length measuring claw is advanced by the end of the weft insertion period, and the length measuring claw is moved to the next weft engaging position while controlling the speed thereof. It controls power supply to the electromagnetic actuator that moves the claw forward and backward, and controls rotation of the drive motor of the length measuring ring. That is, in the present invention, by controlling the speed of the length measuring ring to the next weft locking position, when the loom speeds up, the weaving width can be easily changed, and a new complicated device is added. Functions such as applying a brake when locking the weft to prevent yarn breakage, applying appropriate tension at the time of beating to secure the fabric quality, or pulling back the weft after beating. Can be set.

And by planning the above-mentioned control pattern as the second means, in the process of normal rotation of the length measuring claw from the part before the next weft engagement position to the engagement position as described, The unwound weft catches up while rotating, engages with the length measuring claw that is rotating in the same direction, and is then accompanied to the locking position. Therefore, the braking impact at the time of this locking is reduced, and troubles such as breakage of the weft are eliminated.

According to the third means, before the beating, the length measuring claw rotates forward or backward in a predetermined angle range along with the length measuring ring while the weft is locked, that is, loosening or pulling the weft. Since the tension of the weft to be beaten is corrected, it is possible to avoid a situation in which the yarn breaks during beating, the yarn density becomes uneven, or the ear tissue is loosened. In this case, since the rotation resistance does not act on the length measuring ring as in the case of the conventional slip ring means, the above operation is performed with good responsiveness and lightness.

Further, according to the fourth means, the length measuring claw after beating is reversed from the cloth fell and the predetermined angle range is reversed by the length measuring ring while retaining the weft connected to the weft insertion nozzle. The weft yarn is pulled back, and the leading end is drawn into the weft insertion nozzle. This operation is particularly useful in the case of multicolor weaving, and it is possible to avoid a situation where the leading end of the waiting weft is entangled with the weft being inserted. The above operation is performed lightly with good responsiveness as in the case of the third means.

(Embodiment) An embodiment of the present invention will be described with reference to FIG. 1 to FIG.

First, referring to FIG. 1, a weft storage and length measuring device 11 of this embodiment will be described.
Is roughly divided into a storage unit 13 and a length measuring device 75. Since the storage unit 13 is the same as that of the conventional weft storage and length measuring device 10, the corresponding components are denoted by the reference numerals used in FIG. Therefore, duplicate description will be omitted.

In the length measuring section 75, the main body of the holder 77 erected on the bracket 3 has an annular shape, and the bore 79 of the annular portion 78 faces immediately in front of the drum 31. Immediately behind the annular portion 78, a length measuring ring 85 is arranged. A rail groove 87 is formed on the outer circumference of the length measuring ring, and a ring gear 89 is mounted on the rear side surface. Then, by engaging, for example, four rollers 93 mounted point-symmetrically on the rear side surface of the annular portion 78 with the rail groove 87, the length measuring ring 85 is
It is concentric with 31 and freely rotatable. The length measuring ring includes a ring drive motor, a DC servo motor 95 in this embodiment, a motor pinion 91 and the ring gear 89.
Can be driven to rotate. Further, in this embodiment, a rotation angle sensor 97 of the length measuring ring 85 is constituted by a ring gear 89 and a pickup 99 supported by the holder 77 and opposed to the tip of the ring gear. That is, the pickup 99 detects the tip each time the tooth tip passes in front of it and outputs the rotation angle signal Sα.

The measuring ring 85 has an electromagnetic actuator 103 and a measuring claw 105
And the length measuring claw 105 can be inserted into and removed from the circumferential groove 35 of the drum 31. An electromagnetic actuator 10 is provided between the annular portion 78 of the holder 77 and the length measuring ring 85.
A non-contact type power supply means 121 for supplying power to 3 is configured.

The power supply means 121 of this embodiment is of a rotary transformer type, and has a fixed-side coil 123 and a rotating-side The coil 125 is fitted oppositely. Therefore, when, for example, an alternating current is applied to the fixed coil 123, an alternating current is induced in the rotating coil 125, which is supplied to the electromagnetic actuator to excite the solenoid.
Therefore, as described above, the length measuring claw 105 is pulled out from the circumferential groove 35 of the drum and retreats into the actuator. When the power supply is stopped, the length measuring claw 105 advances by a built-in spring and is inserted into the circumferential groove 35.

However, if an alternating current is used as described above, the coils 123, 125
Since the operation delay becomes large due to the reactance or the like, a direct current is preferably used to further improve the response. An example will be described with reference to FIG. 2. When a primary voltage + V of a rectangular wave as shown in FIG. 2A is applied to the fixed-side coil 123 during the period (T _{1 to} T ₂ ), FIG. as shown in B), beginning T ₁ and the end T secondary voltage respectively having different polarities in ₂ -V ₁ and + V ₂ of the period is induced in the rotary side coil 125. Then, these secondary voltages are formed into a practical waveform as shown in FIG.
These voltages -Va and + Vb are applied to the solenoid of the electromagnetic actuator 103 in the weft locking means 101.

One configuration example of the above-described weft locking means 101 will be described with reference to FIG. A solenoid 109 is provided in a casing 107 of the electromagnetic actuator 103, and a magnet core 111 made of a permanent magnet is inserted into an inner hole of the solenoid so as to be slidable up and down in the drawing. This magnet core
A pin-shaped measuring claw 105 made of non-magnetic stainless steel or the like is attached to the center of 111 and extends downward. Also, tough upper and lower collars 113 made of a non-magnetic material, for example, nylon are adhered to both upper and lower end surfaces of the core. The polarity relationship is determined so that the magnet core 111 is attracted and driven upward when the voltage strike -Va is applied to the solenoid 109.
Is applied, the core 111 is driven downward. The casing 107 is provided with stopper pieces 115 and 117 for restricting the upper limit and the lower limit, respectively, when the magnet core 111 is driven as described above.
These stopper pieces are made of a magnetic material, for example, mild steel, and a length measuring claw 105 penetrates the lower stopper piece 117. Therefore, in the upper limit or the lower limit, the magnet core 111 and the stopper piece 115 or 117 attract each other via the non-magnetic collar 113. Then, the magnitude of the attraction force is set so that the magnet core 111 can be held at an upper limit and a lower limit with an appropriate holding force by this attraction. This setting is color 113
Is appropriately selected.

It is desirable that the magnet core 111 be made of a magnet as strong as possible. If it is a ferromagnetic core,
The magnetic field generation time by the solenoid 109 (the signal voltage −Va,
This is because even if the (+ Vb application time) is short, the core can be strongly driven in response to the magnetic field change at that time. At the initial stage of driving the magnet core 111, that is, when the magnet core 111 is separated from the upper limit or the lower limit, the above-described attractive force resists this. Because the ratio of power is small,
This is because the responsiveness described above can be sufficiently ensured.

Returning to FIG. 1, the bore 79 of the holder 77 has a tapered surface 79a whose front half part narrows forward, and the weft W from the drum 31 via the yarn guide 5 to the weft insertion nozzle 7 is described above. When the yarn is unwound as described above, the weft rotates around the tapered surface 79a. A photoelectric type weft unwinding sensor 127 is mounted on the tapered surface 79a, and each time the weft W passes in front of it, it detects this and outputs an unwinding signal Sw. Reference numeral 129 denotes a crank angle sensor provided on the main shaft 128 of the loom.
Output θ. The crank angle θ is 0 ° (360
゜).

On the other hand, the control unit 131 of the weft storage and length measuring device 11 includes a power supply control unit 133 that controls the operation of the weft locking unit 101, and thus controls the supply of primary power to the fixed coil 123 in the non-contact type power supply unit 121. A rotation control unit for controlling the rotation of the DC servo motor 95 as a ring drive motor
135 and a control pattern setting unit 137 that presets the control pattern in order to cause these control units to perform a control operation according to a previously planned pattern. These components are integrated by an arithmetic processing unit 139. The arithmetic processing unit includes a rotation angle signal Sα from the rotation angle sensor 97, an unwind signal Sw from the weft unwind sensor 127, and a crank angle signal from the crank angle sensor 129. Sθ and the like are input.

An example of the control pattern will be described with reference to FIGS. 4 to 6.

In this example, the weft length measurement amount is (3 + 1 /
3) It is assumed that it is doubled. Also in this example,
As shown in FIG. 4, the weft insertion start θ ₁ (= start of measurement period) is set to 90 °, and the end θ _{2 of} measurement period is set to 240 °. Note that the advance injection of the weft insertion nozzle 7 is started slightly before the start θ _1, and the end of the weft insertion period exists immediately after the end θ ₂ .

The basic form of the above control pattern is as follows. That is, as described above, after the length measuring claw 105 is pulled out from the circumferential groove 35 of the drum at the weft insertion start θ ₁ , the weft W is rotated at the rotational angular velocity ψ.
When unwound with a w (= ψ _1), to accelerate the measuring ring 85 at the same time as the rotational angular velocity ψr until the crank angle is rotated forward to the flipping direction reaches θa becomes a predetermined value ψa . The crank angle θa, if decided weft measuring the amount as described above, at the subsequent crank angle has passed about 2/3 (theta = about 190 °) of the process proceeds to theta ₂ from theta _1, e.g. It is set at 210 ゜. Also it is set so that above the predetermined value ψa weft flipping angular ψw (= ψ ₁₎ sufficiently smaller than the rotational angular velocity, for example [psi _1/3 slightly. And if the crank angle reaches the 210 °, the site A (θa, ψa) led to the end theta ₂ slowing the measurement ring 85 is stopped from. Further, at the time of the transition when the crank angle becomes about 190 ° as described above, preferably at the portion A where the rotational angular velocity 最大 r is the maximum, or at the point D slightly before (for example, point D (θ = θd = 200 °)). 1
Make 05 advance.

As a result, the weft that has been rotated in the third unwinding process catches up with the advanced measuring claw 105 and engages with it,
The engagement point B (θb, ψb) is flipping angular ψw primary braking the weft is multiplied by reduced from [psi ₁ to Pusaibi. In this example, as a ψb ≒ ψ _1/3. Therefore at this time, but acts braking shock in accordance with the fall (ψ ₁ ~ψb) in weft, conventionally, Compared to the drop in the case where once the brake has been applied as a two-dot chain line shown (ψ ₁ ~0) For example, the head at the engagement point B is extremely small, and the weft is received by the length-measuring claw rotating in the same direction.

The weft engaged with the length measuring claw 105 in this manner is subsequently entrained by the length measuring claw to reduce the yarn speed while reducing the crank angle θ ₂ (24
It stops slowly at 0 ゜) and is completely locked here.
Therefore, the braking impact at the locking point C (θ ₂ , O) can also be slightly suppressed.

A specific example of the rotation control of the length measuring ring 85 will be described with reference to FIGS.

In FIG. 5, an arrow X indicates a turning direction (unwinding direction) when the weft is unwound from the drum 31. The weft unwinding sensor 127 is a radial line from the center O of the drum 31 to the top. angle to the O-R ₁ in the counter arrow X direction e ₁ (eg e ₁ =
It shall be fixed with a phase shift of 30 ゜).

And now, as in the of FIG. 5 (A), it is assumed that Hakanagatsume 105 is waiting for the arrival of the weft insertion start timing while locking the weft resting on the radial line O-R ₁ For example, during this standby, the arithmetic processing unit 139 sets the position of the length measuring claw 105 with respect to the weft unwinding sensor 127, in this case, the phase shift angle e.
₁ (= 30 °) (Step S1 in FIG. 6), and the advance angle ea (θd−θ) from this position θ ₁ (90 °) to the point D at which the length-measuring claw should be advanced again. ₁ = 110
゜) is called from the control pattern setting unit 137, and the deviation angle E ₁ (= e ₁ + ea = 140 °) of the measuring nail re-entry point D based on the weft breaking sensor 127 is calculated. It is stored (step S2). Also, during the standby, the arithmetic processing unit 139 monitors the crank angle signal Sθ while checking the previous beating time (θ
The crank angle theta is counted weft insertion start timing from ₀₎ theta ₁
When it reaches (90 °) (step S3), a length measurement instruction is issued (step S4). Then, in response to this instruction, the power supply control unit 133 applies a rectangular-wave DC primary voltage to the fixed-side coil 123 of the non-contact type power supply means 121 as described above to supply power to the electromagnetic actuator 103 (step S5). Thereby, the length measuring claw 105 is pulled in, and the unwinding of the weft is started. At the same time, the rotation control unit 135 activates the DC servo motor 95 as a ring drive motor in response to the length measurement instruction, and starts normal rotation of the length measurement ring 85 (step S6).
By the end θ ₂ (240 °) of the weft insertion period, the radius line O− which has advanced the length measuring claw 105 by 1/3 turn (120 °) from the radius line OR- ₁ through the following process. moving to the position of R _2.

That is, the crank angle θ is changed from θ ₁ (90 °) to θa (21
0 °) to (1 + 1/6) rotates as indicated by an arrow Y ₁ indicated by a solid line while accelerating the measuring ring 85 during the process proceeds to (rotation angle .alpha.a = 420
゜) Then, the measuring nail 105 is brought to the site A. Next, while the crank angle advances to θ ₂ (240 °), while decelerating the length measuring ring, the remaining 1/6 as indicated by the dashed arrow Y _2.
By rotating, the measuring claw passes through the weft engaging point B and then the weft engaging point C (θ ₂ = 240 °, αc = 480 °)
To reach.

In order to perform the above operation, the control pattern setting unit 137 of the control means 131 sends the rotation of the length measurement ring 85 calculated based on the predetermined relationship between the crank angle θ and the rotation angular velocity Δr as shown in FIG. The angle α is defined as α = f ₁ (θ) (θ =
θ _{1 to} θa) and α = f ₂ (θ) (θ = θa to
θ ₂ ) is preset in the form of a function. Then, the arithmetic processing unit 139 calculates the function f ₁ (θ) according to the crank angle signal Sθ.
The rotation control unit 135 drives the servomotor 95 while performing feedback control to match the rotation angle α with the function f ₁ (θ) while inputting the rotation angle signal Sα, and controls the acceleration of the length measuring ring 85. Is performed (step S8). Thus, when the rotation angle α reaches the aforementioned αa (= 420 °) (step S10), deceleration control of the length measuring ring is performed according to the function α = f ₂ (θ) (step 12), and the rotation angle α becomes When the value of αc (= 480 °) is reached, the servomotor 95 is stopped (steps S14 and S16).

On the other hand, the arithmetic processing unit 139 counts the unwinding signal Sw each time the unwinding signal Sw is input from the weft unwinding sensor 127 after the step S5 and the total frequency becomes 3 (step S7). The rotation angle of the length measurement ring (Step S
9). And by calculating the deviation angle of the measuring pawl 105 relative to the radial line O-R ₁ from the rotation angle (± △ e _1), the polarization preferred angle _{E 1, E '1 = E} 1 (Step S11). The arithmetic processing unit continuously monitors the rotation angle signal Sr and
When 85 is rotated by biasing angle E _'1, which is further the correction from the time of step S9 (step S13), and the power supply control unit 133
A power supply stop instruction is issued (step S15). Therefore, in response to the instruction, the power supply control unit 133 cuts off the electric path to the fixed side coil 123 of the non-contact type power supply means and causes the length measuring claw 105 to re-enter as described above. This step S15 is the same as the step
Connected to S10. When the length measuring ring 85 is stopped in step S16, the measuring ring rotation angle α and the total frequency of the unwinding signal Sw are zeroed out, and the fifth weft insertion is performed for the next weft insertion.
It is made to stand by as shown in FIG.

That is, this next weft insertion start from the place of the radial line O-R _2, length measuring ring 85 is the arrow Y ₁ and
Y ₂ according (1 + 1/3) rotated forward to measuring Nagatsume 105 terminates at that led on radial line O-R _3. Then, the phase deviation angle (e ₁ ) of the length measuring claw 105 at the time of starting increases like e ₂ in this case, and accordingly, the deviation angle E ₁ is corrected like E _2. .

Similarly, the next weft insertion starts from the above-mentioned radius line OR- ₃ as shown in (C) of the same figure and ends when the length measuring claw 105 reaches the original radius line OR- _1. I do. signal
e ₃ and E ₃ indicate the phase shift angle and the deviation angle at this time, respectively. In this case, after the weft unwinding signal Sw is counted three times as described above, when the weft engaged with the length measuring claw 105 at the point B passes in front of the weft unwinding sensor 127, it is unwound again. A signal is emitted. Therefore, this is added to the above-mentioned count value, or "1" is separately counted. In this embodiment, the frequency of the unwinding signal Sw is set to zero immediately after the end of the weft insertion period. Therefore, it does not affect the subsequent length measuring operation (step S18).

If the weft unwinding sensor 127 is arranged at a plurality of positions and a sensor close to the start position and as far as possible on the side of the arrow X is appropriately selected and used, the shift angle e (e ₁ , e ₂ ,
control is facilitated since it is possible to reduce the variation of e _3).

Further, in this embodiment, the length measuring ring 85 is driven to rotate simultaneously with the start of unwinding of the weft. However, as shown by the two-dot chain line (ψ′r) in FIG. May be appropriately delayed. This is because the DC servo motor is particularly excellent in acceleration up to a high-speed rotation range and deceleration therefrom, so that the drive control time can be further reduced. By setting the time delay in this manner, the length measuring claw can be pulled out while the length measuring ring is securely stopped, so that the weft insertion operation is stabilized.

FIG. 7 illustrates another drive control pattern for the length measuring ring 85. In this example, it is assumed that the weft length measurement amount is set to (3 + 2/3) times the drum circumference. Thus, for example, when you start the weft yarn unwinding on the radius line O-R _1, Hakanagatsume 105 stops reached on the radius line O-R ₃ for long-term end measurement. The control pattern of this example is as follows.

As mentioned above, the radius line O-
When the length measuring claw 105 retreats on R ₁ , at the same time or after an appropriate time lag, the length measuring ring 85 is moved by a predetermined angle as indicated by an arrow Z ₁ , for example, by 120 ° in a direction opposite to the arrow X. the reverse driven to accelerate to the site a in accordance with the curve of the 2 rolling chain line in FIG. 4 by the forward rotation as arrow Z ₂ from here. Next, the speed is reduced in the same pattern as in the case of FIG. 5 as described above to bring the length measuring claw 105 to the weft locking point C on the radius line OR- ₃ , where it is stopped.

In the this example, finding range region that can perform efficient acceleration control according to the characteristics of the servo motor, the acceleration region (forward area indicated arrow Z ₂₎ is set on the basis of the range area. Then, since the length measuring ring 85 is reversed for this setting, as in this example, the next weft locking position (C) is in the reverse direction to the start rotation (O-R ₁ ), and When they are located relatively close to each other, the setting of the acceleration region is facilitated.

In each of the above embodiments, for simplicity of description, the length measurement amount is determined so as to start from the first start point (OR) and return to this start point after a number of cycles. However, since the length measurement is determined mainly based on the weaving width, the above case is rarely applicable. That is, in general, the positional relationship between the length measuring claw 105 and the weft unwind sensor 127 changes without being substantially reproduced.In this case, the weft unwind sensor 127 is arranged at a plurality of positions as described above, After confirming the position of the length measuring claw 105 (step S1), an appropriate sensor 127 may be selected under the above-described conditions.

Further, the ring drive motor (95) system excellent in high-speed control as described above can also be constituted by a combination of a high-speed air motor and a servo valve.

The weft yarn measured and inserted as described above is conveyed to the cloth fell side by the reed feathers, beaten, and cut off from the cloth fell immediately thereafter. Here, the air guide path of the weft insertion air described above is of a so-called closed type constituted by a row of air guides having a closed guide hole, except for having a slit for weft escape above. In such a case, the air guide row is caused to escape below the warp row while the weft in the air guide path escapes from the slit in the latter half of the beating stroke. Therefore, in this case, when the weft insertion nozzle 7 fixed in the same row as the air guide moves away from the cloth fell, the weft yarn is pulled by that much and the tension increases.

On the other hand, when the air guide path is a so-called open type that is formed in a groove shape by rows of recesses formed on the front face of each reed, for example, the air guide path accommodates a weft yarn and a weft insertion nozzle. At the same time, the beating is progressed almost on the warp line and the beating is performed by the bottom of the concave portion. In this case, the weft is not positively pulled, so that the tension is generally insufficient.

As shown by curves F and G in FIG. 4, the beating time (θ ₀ = 0 °) so that the beating is performed under an appropriate weft tension while compensating for the excess or deficiency of the tension described above. Before the adjustment, the tension is adjusted by the length measuring ring 85. That is, the curve F is applied to the case of the above-mentioned closed type.
By turning the measuring ring 85 forward by a predetermined angle αf from ゜ to just before the beating, the measuring claw 10 locking the weft is
5 is moved in the unwinding direction (X) to moderately reduce the weft tension. The curve G is applied to the case of the above-mentioned open type.
= 345 °, during a very short time immediately before beating, the length measuring ring is reversed by a predetermined angle -αg to pull back the weft and apply a predetermined tension thereto. The operation timing of the length measuring ring, the rotation angles αf, −αg, the forms of the curves F, G, etc. are the rotation speed of the loom,
It is determined according to the weaving width, yarn type and other weaving conditions. Then, these specifications are preset in the control pattern setting unit 137 of the control means 131 together with the precondition of the forward rotation or the reverse rotation, and servo control is performed via the arithmetic processing unit 139 and the rotation control unit 135 as described above. The drive control of the motor 95 is performed.

By adjusting the tension of the weft to be beaten to an appropriate value in this way, as described above, the yarn density and the ear structure are stabilized, and yarn breakage and separation errors are prevented.

Further, the following control patterns are preset in the control pattern setting section 137 so that the weft pull-in operation can be performed after beating.

That is, if the weft connected to the weft insertion nozzle is cut and spoke from the woven edge at the crank angle θ = 5 ° immediately after the beating, then the length measurement is performed, for example, between θ = 15 ° to 40 °. The weft is pulled back by reversing the ring 85 by a predetermined rotation angle -αh. The amount of retraction is such that the leading end of the cut off weft yarn is drawn into the injection port of the weft insertion nozzle 7, and the rotation angle -αh is determined based on this amount. Since the leading end of the weft thread thus drawn in advances straight out of the injection port at the same time as the preceding injection is started from the weft insertion nozzle 7, the flight attitude in the subsequent weft insertion is stabilized. In the case of a long waiting period until the beginning of the next weft insertion, such as the multicolor weaving loom, the measuring ring is stopped and the rotation angle −αh is maintained shortly before the beginning of the weft insertion. Preferably, this avoids the trouble that the leading end of the weft advances inadvertently and gets caught in another weft.

〔The invention's effect〕

As described above, according to the present invention, the length measuring claw is advanced by the end of the weft insertion period, and the length measuring claw is moved to the next weft engaging position while controlling the speed. It controls power supply to the electromagnetic actuator that moves the claw forward and backward, and controls rotation of the drive motor of the length measuring ring. That is, in the present invention, when the loom is accelerated by speed-controlling the length measuring ring to the next weft locking position,
The weaving width can be easily changed, and without adding a new complicated device, braking is applied when the weft is locked to prevent thread breakage, and the appropriate tension is applied at the time of beating to improve the cloth quality. Or a control pattern capable of adding a function of pulling back the weft after beating can be set.

Against this background, the present invention is also configured so that the unwound yarn is engaged with the length-measuring claw to accompany it to the locking position. In addition, the braking impact at the time of locking is reduced, and troubles such as breakage of the weft are prevented.

Further, the present invention is configured to correct the weft thread tension to an appropriate value by rotating the length measuring claw in a predetermined angle range at an appropriate time before beating, thereby stabilizing the thread density and ear structure. Can be. Further, since the present invention is configured such that the length-measuring claw is rotated within a predetermined angle range after beating, the leading end of the waiting weft is drawn into the weft insertion nozzle, especially in the case of multicolor weaving. In this way, the wefts are prevented from being entangled with each other.

[Brief description of the drawings]

1 to 7 are views showing an embodiment of the present invention, wherein FIG. 1 is a side sectional view of a weft storage and length measuring device and a block diagram of a control means thereof, and FIG. FIG. 3 is a side sectional view showing one embodiment of the weft locking means, and FIG. 4 is a view for explaining the operation timing of the length measuring ring and the length measuring claw. FIG. 5 is a diagram showing one mode of the control pattern, FIG. 6 is an operation flowchart of the control means based on the control pattern of FIG. 5,
FIG. 7 is a view showing another embodiment of the control pattern, and FIG. 8 is a side sectional view of a conventional device. 11 ... weft storage and length measuring device 31 ... drum 85 ... length measuring ring 95 ... DC servo motor (ring drive motor) 97 ... rotation angle sensor 101 ... weft locking means 103 ... electromagnetic actuator 105 ... Measuring claw 121 Non-contact type power supply means 127 Weft unwinding sensor 129 Crank angle sensor 131 Control means 133 Power supply control unit 135 Rotation control unit 137 Control pattern setting unit 139 … Calculation processing unit

Claims (4)

(57) [Claims] 1. A drum (31) for winding and storing a weft so that it can be unwound, a length measuring ring rotatable concentrically with the drum, a ring drive motor for rotating and driving the length measuring ring, A device (11) having a length-measuring claw that is reciprocally driven from an electromagnetic actuator supported by a length measuring ring, advances to the drum side, and locks a weft so that it cannot be unwound, and is connected to the electromagnetic actuator (103). Power supply means (121) for supplying power,
In order to advance the length-measuring claw (105) by the end of the weft insertion period, and to move this length-measuring claw to the next weft locking position (C) while controlling the speed, in accordance with a control pattern pre-planned. A weft storage and length measuring device, comprising: control means (131) for controlling power supply to the electric actuator and controlling rotation of the ring drive motor (95). 2. The weft storage and length measuring device according to claim 1, wherein the control pattern holds the length measuring claw (105) to a portion (A) before the next weft locking position (C). After it arrives, it rotates forward from the position in the unwinding direction (X) of the weft and at a rotation angular velocity (φr) smaller than the rotation angular velocity (φw) of the weft accompanying the unwinding to the above-described locking position. A weft storage and length measuring device for causing the length measuring claw to advance on the way to the locking position. 3. The weft storage and length measuring device according to claim 1, wherein the control means (131) is designed in advance to correct the tension of the weft at a predetermined position before beating. A weft storage and length measuring device having a function of controlling the rotation of a ring drive motor (95) so as to rotate the length measuring ring (85) forward or backward in accordance with the rotation direction and the rotation angle (αf, −αg). (4) Claim (1) or (2) or (3)
In the weft storage and length measuring device according to (1), the control means (131)
However, a weft storage and length measuring device having a function of controlling the rotation of a ring drive motor (95) in order to reverse the length measuring ring (85) by a previously planned rotation angle (-αh) after beating.