JPH10331055A - Weft storing apparatus for fluid jetting type weaving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject apparatus of simple constitution, capable of efficiently storing weft with a small amount of a circular air flow and not damaging the weft. SOLUTION: This weft storing apparatus has a cylindrical storage part 20 fixed to a revolving shaft 10 rotating synchronously with the main shaft of a water machine and a holding part 16 fixed to the revolving shaft 10 coaxially with the storage part 20. The holding part 16 has a truncated cone-shaped side converging from the edge part of the storage part 20 in a weft drawing direction and is equipped with a stationary cover 34 provided with a channel part 32 constituting a part of a circular air flow passage 30 which covers the truncated cone-shape side and rotates a weft. A channel part 26 constituting the circular air flow passage 30 is formed on the truncated cone-shaped side of the holding part 16 opposing to the channel part 32 of the stationary cover 34. The ratio of the central diameter of the circular air flow passage 30 to the outer diameter of the storage part 20 is 0.4-0.85.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft storage device for winding a weft around a rotating weft storage drum when wefting a fluid jet loom.

[0002]

2. Description of the Related Art As a conventional weft storage device of a fluid jet loom, Japanese Patent Application Laid-Open No. 52-15528 by the present applicant has been proposed.
And Japanese Patent Application Laid-Open No. Sho 59-1745. This forms an annular airflow path in the weft path in front of the weft storage drum that rotates in synchronization with the main shaft of the loom, and circulates in the airflow path in the same direction as the rotation direction of the weft storage drum. The weft is rotated by blowing an airflow into the storage drum, thereby winding the weft around the storage drum.

In order to stably store the weft in such a rotary type weft storage device, it is necessary that the peripheral speed of the storage drum and the rotation speed of the weft be substantially the same. For this reason, conventionally, the center diameter of the annular airflow channel is set to be close to the outer shape of the storage drum, and the center diameter of the annular airflow channel is generally about 1 to the outer diameter of the weft storage drum.
The ratio is set to about 0.9.

[0004]

In recent years, with the increasing speed of looms, the storing speed of wefts has also been increased. Therefore, in the case of the above-mentioned conventional weft storage device, it is necessary to increase the flow velocity of the airflow in the annular airflow passage extremely with the increase in the peripheral speed of the storage drum. For this reason, it is required that the capacity of the blower for supplying the airflow be made considerably large, and this causes a problem that the energy consumption of the motor for driving the blower increases. In addition, when the flow velocity of the airflow in the annular airflow passage is increased, the release resistance at the time of weft release during weft insertion is increased, so that the pressure and discharge amount of the weft-injection jet fluid must be increased. Have to be. As a result, the energy consumption for weft insertion is increased, and the weft is adversely affected such as damage.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has a simple structure and can store a weft yarn with a small airflow, and does not adversely affect the weft yarn. It is an object of the present invention to provide a weft storage device.

[0006]

According to the present invention, there is provided a cylindrical storage portion fixed to a rotating shaft which rotates in synchronization with a main shaft of a loom, and a holding portion fixed to the rotating shaft coaxially with the storage portion. The holding portion has a frusto-conical side surface that converges in the weft withdrawal direction from the edge of the storage portion, and the annular airflow channel that covers the frusto-conical side surface and rotates the weft yarn. A fixed cover provided with a groove that forms a part thereof is provided. Further, facing the groove portion of the fixed cover, a groove portion forming the annular airflow channel is also provided on the truncated conical side surface of the holding portion, and the side surfaces on both sides of the groove portion of the holding portion,
A weft storage device for a fluid jet loom, wherein a weft portion, which is a slit through which the weft is inserted, is formed together with the inner surface of the fixed cover. Further, the ratio of the center diameter of the annular airflow channel to the outer diameter of the storage section is set to 0.4 to 0.85, and more preferably set to 0.5 to 0.7.

[0007] The weft storage device of the fluid type loom of the present invention comprises:
The center diameter of the annular airflow channel is formed smaller than the conventional one, and the weft is rotated at the same peripheral speed as the storage part by increasing the airflow angular velocity. Also, the weft is held in the annular airflow channel with respect to the holding portion through the weft insertion portion, which is a weft insertion slit on the side of the truncated cone, and wound around the storage portion, and the airflow rate of the annular airflow channel And the flow rate and the driving power are reduced so as to be stored efficiently.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. A fluid-jet type weft storage device of this embodiment includes a leading end portion of a rotary shaft 10 which is connected to a main shaft of a loom (not shown) by a belt and driven synchronously. Holding part 1 fixed at the center part by bolts 14 to the tapered part 12 of
6 and a cylindrical weft storage drum 18
Has been fixed. The rotating shaft 10 is provided on a loom (not shown) via a bearing 11.

The weft storage drum 18 is formed in a bottomed cylindrical shape with one end surface opened and the other end surface forming a bottom surface, and the cylindrical side surface portion is formed as a weft storage portion 20, and the end surface portion is formed. It is attached to the holding part 16. The weft storage drum 18 is coaxially fixed to the holding unit 16 by a plurality of bolts 22 screwed from the end face to the holding unit 16, and is provided so as to be able to rotate integrally with the rotating shaft 10.

The holding portion 16 is formed in a truncated cone shape converging from the edge of the storage portion 20 in the drawing direction of the weft, and the apex portion of a virtual cone forming the truncated cone is inserted into the weft for weft insertion. Is provided. A semicircular groove 26 is formed over the entire circumference at the approximate center of the frustoconical side surface of the holding portion 16.

Further, on the outside of the side surface of the holding portion 16,
A fixed cover 34 that covers the frustoconical side surface and has a groove 32 that forms a part of the annular airflow channel 30 that rotates the weft is provided. A gas inlet 36 is connected to the groove 32 of the fixed cover 34.
A gas having a predetermined flow rate is blown into an annular airflow channel 30 formed by the groove 26 and the holding portion 16. Here, both sides of the groove portion 26 of the holding portion 16 are formed with frustoconical side surfaces, and both sides of the groove portion 32 on the inner surface of the fixed cover 34 are also formed with frustoconical inner surfaces. A slit portion between the fixed cover 34 and the fixing cover 34 serves as a yarn guiding portion 38 through which the weft is inserted. The large-diameter end of the frustoconical holding portion 16 is a cylindrical portion 40 whose side surface is cut off near the end surface.

Next, the operation of the weft storage device of this embodiment will be described. In the weft storage device of this embodiment, a weft supplied from a yarn feeder (not shown) is guided onto the storage unit 20 via a feed roller (not shown). Then, the weft passes through the storage unit 20 and the holding unit 16 and the fixed cover 3.
4 is guided to the yarn guide 24 through a yarn guiding portion 38 which is a frustoconical slit, and further guided to a weft insertion nozzle via a clamper that opens and closes in accordance with the weft insertion.

The feed roller rotates at a constant speed and feeds out the weft yarn.
The length of weft required to feed the weft is sent out. Therefore, when the weft is gripped by the clamper, the weft sent out during this time is slackened between the feed roller and the clamper, and the slackened weft is rotated by the airflow of the annular airflow channel 30 and is rotated with the rotation of the storage unit. Is stored.

In such a weft storage, in the weft storage device of this embodiment, the center diameter D
₁ is set so as to have a ratio of _0.4 to 0.85 with respect to the outer diameter D0 of the storage section 20 of the weft storage drum 18, so that the weft is rotated by an annular airflow having a relatively small diameter. ing. Therefore, the speed of the air flow required to obtain the angular velocity required to rotate the weft yarn at a speed equal to the peripheral speed of the storage unit 20 is reduced, and is proportional to the center diameter D ₁ of the annular air flow passage 30. Can be smaller.

With the center diameter D ₁ of the annular air flow channel 30 set as described above, the distance L ₁ from the holding portion side end of the storage section 20 to the center of the annular air flow channel 30. And the opening angle θ of the frusto-conical yarn introduction section 38 also needs to be set appropriately, but the values of both of them are 0.2 to ₀ in the ratio of L ₁ to the outer diameter D ₀ of the storage section 20. .6, and .theta. Is preferably set in the range of 40 to 70 degrees. In other words, in order to obtain a D ₁ that has been set, the only change the L ₁ wishing to make a hand, occur if L ₁ is too large, increase in size of the apparatus along with this, and the yarn introduction part 38 This may cause an increase in resistance when winding or releasing the weft due to an increase in the distance. If the change is made by changing only θ, θ may become too large, and the resistance to the weft at the bent portion of the storage drum 18 and the yarn guide 24 increases, and the unwinding resistance of the weft increases. May be increased. Therefore, by appropriately selecting and setting L ₁ and θ within the above range, even when the center diameter of the annular airflow channel 30 is relatively reduced, stable storage and weft insertion can be performed. Become.

According to the weft storage device of this embodiment, the weft is held by the annular airflow channel 30 having a relatively small diameter and the weft is stored in the storage portion 20, so that the speed of the airflow may be relatively small. In addition, the number of rotations of the air flow supply blower can be reduced, and the power consumption of the blower driving motor can be reduced.

[0017]

EXAMPLE A first example of the weft storage device of the above embodiment will be described below. In this embodiment, the opening angle θ of the frusto-conical yarn introduction section 38 is 50 degrees, and the diameter D ₀ of the storage section 20 is 10 degrees.
0 mm, and the distance L ₁ from the storage unit 20 to the annular airflow channel 30 is changed to change
The ratio D ₁ / D ₀ for D ₀ of the center diameter D ₁ of the, 0.4 and 0.
The measurement was performed on five types of 5, 0.6, 0.7, and 0.85, and at that time, the minimum blower rotation speed normally inserted into the weft and the power consumption of the blower driving motor were measured. Figure 3 of which the _{D 1 = 60mm, D 1 /} D 0 = 0.
6 is an example. Here, the results of the above five measurements are shown in FIG. The woven product of this embodiment has a nylon taffeta, a weft of N70d / 24F, a thread width of 1,884 mm, and a loom rotation speed of 1,000 rpm.

[0018] From this example, the ratio D ₁ / D ₀ for D ₀ of the center diameter D ₁ of the annular air flow passage 30 has a small lowest power in the range of 0.5 to 0.7, efficient yarn It can be seen that the storage is within the possible range. When the ratio D ₁ / D ₀ is up to about 0.85, the power consumption can be considerably reduced as compared with the case where the ratio D ₁ / D _{0 of the related art} is almost equal. It is. If D ₁ / D ₀ is smaller than 0.4, the difference in diameter between the storage section 20 and the annular airflow channel becomes too large, and the torque required for rotating the weft becomes large. Must be increased, and the small diameter tends to cause turbulence in the airflow in the annular airflow channel, resulting in a sharp decrease in efficiency.

As described above, the center diameter D ₁ of the annular airflow passage 30 is obtained.
The ratio D ₁ / D ₀ for D ₀ of, D ₁ / D ₀ of the above 0.4
0.85 is sufficient. To further reduce power consumption,
D ₁ / D ₀ is preferably set to 0.5 to 0.7.

Next, a second embodiment of the weft storage device of the present invention will be described with reference to FIG. Here, the same members as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted. The weft storage device of this embodiment has an opening angle θ of the yarn introduction portion 38 of 70 ° with respect to D ₀ = 100 mm,
An example is shown in which the diameter D ₁ = 60 mm and the distance L ₁ = 40 mm from the end of the storage section 20 on the holding section side to the center of the annular airflow channel 30. Also in this case, similarly to the above-described embodiment, the power consumption of the blower can be reduced to about half as compared with the conventional case.

Next, a third embodiment of the weft storage device of the present invention will be described with reference to FIG. Here, the same members as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted. The weft storage device of this embodiment has an opening angle θ of the yarn introduction portion 38 of 70 ° with respect to D ₀ = 100 mm,
An example is shown in which the diameter D ₁ = 50 mm and the distance L ₁ = 47 mm from the end of the storage section 20 on the holding section side to the center of the annular airflow channel 30. Also in this case, similarly to the above-described embodiment, the power consumption of the blower could be reduced to nearly half as compared with the conventional case.

[0022]

According to the fluid jet type weft storage device of the present invention, the diameter of the annular air flow passage is made relatively small with respect to the storage portion, and the circular storage flow passage has a frustoconical guide on both sides in the weft direction. The yarn portion is formed, and the weft can be efficiently stored with little energy.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a fluid ejection type weft storage device according to a first embodiment of the present invention.

FIG. 2 shows the ratio D ₁ of the center diameter D ₁ of the annular airflow channel to the diameter D ₀ of the storage section by the weft storage device of the first embodiment of the present invention.
6 is a graph showing a conventional ratio between the blower rotation speed and the current consumption when / D ₀ is changed.

FIG. 3 is a partial sectional view of another example of the weft storage device of the first embodiment of the present invention.

FIG. 4 is a partial sectional view of a weft storage device according to a second embodiment of the present invention.

FIG. 5 is a partial sectional view of a weft storage device according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Rotating shaft 16 Holding part 18 Weft storage drum 20 Storage part 26, 32 Groove part 30 Annular air flow path 34 Fixed cover 38 Yarn introduction part

Claims (2)

[Claims] 1. A storage unit having a cylindrical shape fixed to a rotating shaft that rotates in synchronization with a main shaft of a loom, and a holding unit fixed to the rotating shaft coaxially with the storing unit. It has a frustoconical side surface that converges in the weft withdrawal direction from the edge of the storage part, and a groove portion that covers the frustoconical side surface and forms a part of an annular airflow channel that rotates the weft is formed. A groove that constitutes the annular airflow channel is also provided on the frustoconical side surface of the holding portion, facing the groove of the fixed cover, and the annular portion is formed with respect to the outer diameter of the storage portion. When the ratio of the center diameter of the airflow channel is 0.4 to 0.5.
85, a weft storage device for a fluid jet loom. 2. The fluid jet type weft storage device according to claim 1, wherein a ratio of a center diameter of the annular airflow channel to an outer diameter of the storage portion is set to a ratio of 0.5 to 0.7. .