JP3496861B2 - Weft storage device for fluid jet loom - Google Patents

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 on a rotating weft storage drum during weft insertion of a fluid jet loom.

[0002]

2. Description of the Related Art As a conventional weft storage device for a fluid jet loom, Japanese Patent Application Laid-Open No. 52-15528 disclosed by the present applicant.
JP-A-59-1745 and JP-A-59-1745. This forms an annular airflow passage in the weft path in front of the weft storage drum that rotates in synchronization with the main axis of the loom, and circulates in the airflow passage in the same direction as the rotation direction of the weft storage drum. By blowing the air current in this manner, the weft yarn is rotated around the storage drum, so that the weft yarn is wound 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 rotational speed of the weft are substantially the same. Therefore, conventionally, the center diameter of the annular airflow passage is set to be close to the outer diameter of the storage drum, and generally, the center diameter of the annular airflow passage is approximately 1 with respect to the outer diameter of the weft storage drum.
The ratio is set to about 0.9.

[0004]

In recent years, along with the increase in the speed of loom, the weft storage speed has been increased. Therefore, in the case of the above-mentioned conventional weft storage device, it is necessary to make the flow velocity of the airflow in the annular airflow passage extremely high as the peripheral speed of the storage drum increases. For this reason, it is required to make the capacity of the blower for supplying the air flow considerably large, which causes a problem that the energy consumption of the motor for driving the blower increases. Further, if the flow velocity of the air flow in the annular air flow passage is increased, the release resistance at the time of weft release at the time of weft insertion will increase accordingly. Therefore, the pressure and discharge amount of the weft inserting jet fluid must be increased. I will have to do it. As a result, the energy consumption for weft insertion is increased and the weft is adversely affected such as being damaged.

The present invention has been made in view of the above-mentioned problems of the prior art, and has a simple construction and enables the wefts to be stored with a small air flow, and does not have a bad effect such as damage to the wefts. An object of the present invention is to provide a weft storage device.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a cylindrical storage drum fixed to a rotary shaft that rotates in synchronization with the main shaft of a loom.
And the front side of this storage drum in the direction of weft withdrawal.
A yarn guide that is located at the position to deflect the weft in the weft inserting direction,
The storage drum is provided with a holding portion that is fixed coaxially with the rotating shaft , and a weft yarn is provided on a cylindrical side surface of the storage drum.
Is a weft yarn storage device having a storage portion around which is wound.
The holding portion is provided with the end edge portion of the storage drum and the yarn guard.
Frustum- shaped side surface formed along the conical surface connecting the id
And pulling out the weft from the edge of the storage drum on this side.
The weft thread is formed coaxially at a position separated by a predetermined distance in the direction
With the groove part that constitutes a part of the annular airflow passage for turning
A guide yarn having a weft insertion space on the outer peripheral side of the holding portion.
A portion to cover the side surface of the truncated cone, and
The annular airflow passage is formed at a position facing the groove of the holding portion.
A fixed cover provided with a groove portion is provided. So
Then, gas is blown into the annular airflow passage to supply airflow.
The mouth is connected, and the center diameter of the annular airflow passage is the storage
So that the ratio is 0.4 to 0.85 with respect to the outer diameter of the part
It is the weft yarn storage device of the fluid injection type loom that has been formed .
Of the central diameter of the annular airflow channel with respect to the outer diameter of the reservoir
The ratio is more preferably set to a ratio of 0.5 to 0.7.
Has been.

The weft storage device of the fluid type loom of the present invention is
The center diameter of the annular airflow passage is formed smaller than that of the conventional one, and the weft yarn is rotated at the same peripheral speed as that of the storage portion by the airflow having a lower flow velocity than the conventional one. This
The weft thread on the side of the truncated cone
Weft in the annular air flow path through the threading part that is a through slit
Is retained around the storage portion, and the flow rate and flow velocity of the annular airflow passage and its driving power are reduced to enable efficient storage.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION 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 injection type weft yarn storage device of this embodiment is a tip 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. The holding portion 1 fixed to the tapered portion 12 of the
6, the holding portion 16 has a cylindrical weft storage drum 18
Is fixed. The rotating shaft 10 is provided on a loom (not shown) via a bearing 11.

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

The holding portion 16 is formed into a truncated cone shape that converges in the weft withdrawing direction from the end edge portion of the storage portion 20, and a weft thread for weft insertion is provided at the apex portion of an imaginary cone forming this truncated cone. A yarn guide 24 that deflects the light is provided. A semi-circular groove portion 26 is formed over the entire circumference in the substantially central portion 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 is provided which covers the side surface of the truncated cone shape and which has a groove portion 32 forming a part of the annular airflow passage 30 for rotating the weft. The gas inlet 36 is connected to the groove 32 of the fixed cover 34.
A gas having a predetermined flow velocity is provided in the annular airflow passage 30 constituted by the groove portion 26 of the holding portion 16 and the groove portion 26 of the holding portion 16. Here, both sides of the groove portion 26 of the holding portion 16 are formed with truncated cone-shaped side surfaces, and both sides of the groove portion 32 on the inner surface of the fixed cover 34 are also formed with a truncated cone-shaped inner surface. A slit portion between the fixed cover 34 and the fixed cover 34 serves as a yarn guide portion 38 through which the weft thread is inserted. Further, the large-diameter side end portion of the truncated cone-shaped 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 yarn storage device of this embodiment, the weft yarn supplied from the yarn feeder (not shown) is guided to the storage portion 20 via the feed roller (not shown). Then, the weft thread passes through the storage section 20 and the holding section 16 and the fixed cover 3
4 is guided to the yarn guide 24 through a yarn guide portion 38 which is a truncated cone-shaped slit between the cords 4 and 4, and is further guided to a weft insertion nozzle through a clamper which opens and closes in accordance with weft insertion.

The feed roller rotates at a constant speed to feed out the weft yarn, and the feed roller is rotated once during one cycle of the loom.
The weft thread of the length required for weft insertion is sent out. Therefore, when the weft yarn is gripped by the clamper, the weft yarn delivered during this becomes slack between the feed roller and the clamper, and the slack weft yarn is rotated by the airflow of the annular airflow passage 30 and accompanying the rotation of the storage section. Stored.

In such weft storage, in the weft storage device of this embodiment, the center diameter D of the annular airflow passage 30 is set.
₁ is set to have a ratio of _0.4 to 0.85 with respect to the outer diameter D ₀ of the storage portion 20 of the weft storage drum 18, and the weft is rotated by an annular air flow having a relatively small diameter. ing. Therefore, the velocity of the air flow required to obtain the angular velocity required to rotate the weft yarn at a velocity equal to the peripheral velocity of the storage portion 20 is low, and is small in proportion to the center diameter D ₁ of the annular air flow passage 30. can do.

Incidentally, as the center diameter D ₁ of the annular airflow passage 30 is set as described above, the distance L ₁ from the end portion of the storage portion 20 on the holding portion side to the center of the annular airflow passage 30. And the opening angle θ of the truncated cone-shaped yarn guide portion 38 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 portion 20. It is preferable that θ is set in the range of 0.6 and θ is in the range of 40 to 70 degrees. That is, in order to obtain the set D ₁ , if only L ₁ is changed and it is attempted to do so, there may be a case where L ₁ becomes too large, which causes an increase in the size of the device and the yarn introducing portion 38. When the weft is wound or unwound, the resistance may increase due to the increased distance. If only θ is changed, θ may become too large, which increases resistance to the weft at the bent portions of the storage drum 18 and the yarn guide 24, resulting in unwinding resistance of the weft. May increase. Therefore, by appropriately selecting and setting L ₁ and θ within the above range, stable storage and weft insertion are possible even when the center diameter of the annular airflow passage 30 is relatively small. Become.

According to the weft yarn storage device of this embodiment, the weft yarn is held in the storage portion 20 by the annular air flow passage 30 having a relatively small diameter, so that the velocity of the air flow can be relatively small. The rotation speed of the blower for supplying the airflow can be reduced, and the power consumption of the motor for driving the blower can be reduced.

[0017]

EXAMPLES A first example of the weft yarn storage device of the above embodiment will be described below. In this embodiment, the opening angle θ of the truncated cone-shaped yarn guide portion 38 is 50 degrees and the diameter D ₀ of the storage portion 20 is 10.
The distance L ₁ from the reservoir 20 to the annular airflow passage 30 is changed to a constant value of 0 mm, and the annular airflow passage 30 is changed.
The ratio _D 1 / _{D 0} for _{D 0} of the center diameter _{D 1} of the 0.4,
It carried out about 5 types, 0.5, 0.6, 0.7, and 0.85, and measured the minimum blower rotation speed and the power consumption of the blower drive motor which are normally inserted at that time. FIG. 3 shows that D ₁ = 60 mm, D ₁ / D ₀ =
This is an example of 0.6. Here, FIG. 2 shows the measurement results of the above five types. The woven product of this example is nylon taffeta, the weft is N70d / 24F, the passing width is 1884 mm, and the loom rotational speed is 1000 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 is 0.5 to 0.7
It is understood that the range of 1 is the range in which the power consumption is the smallest and the yarn can be stored with high efficiency. Further, this ratio D ₁ / D ₀
Is up to about 0.85, D ₁ / D of the prior art
_The power consumption can be considerably reduced as compared with the case where ₀ is a substantially equal ratio. Also, this D ₁
If / D ₀ is smaller than 0.4, the difference in diameter between the storage portion 20 and the annular airflow passage becomes too large, and the torque required to rotate the weft becomes large, which in turn increases the airflow velocity. It becomes necessary to make the air flow in the annular air flow passage more turbulent due to the smaller diameter, resulting in a sharp drop in efficiency.

From the above, the center diameter D ₁ of the annular air flow passage 30
The ratio _D 1 / _{D 0} for _{D 0} of the may be any _D 1 / _{D 0} of the above 0.4 to 0.85 and to reduce power consumption _more, 0.5 to D 1 / _{D 0} It is better to set it 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 designated by the same reference numerals, and the description thereof will be omitted. In the weft yarn storage device of this embodiment, the opening angle θ of the yarn guide portion 38 is 70 °, the annular airflow passage 30 is provided for D ₀ = 100 mm.
An example in which the diameter D ₁ = 60 mm and the distance L ₁ = 40 mm from the holding portion side end of the storage portion 20 to the center of the annular airflow passage 30 is shown. Also in this case, the power consumption of the blower could be reduced to about half as compared with the conventional case, as in the above embodiment.

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 designated by the same reference numerals, and the description thereof will be omitted. In the weft yarn storage device of this embodiment, the opening angle θ of the yarn guide portion 38 is 70 °, the annular airflow passage 30 is provided for 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, the power consumption of the blower could be reduced to almost half as compared with the conventional case, as in the above embodiment.

[0022]

In 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 conical trapezoidal guides are provided on both sides of the annular storage passage in the weft direction. Since the yarn portion is formed, the weft yarn can be efficiently stored with a small amount of energy.

[Brief description of drawings]

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

FIG. 2 shows the ratio D of the center diameter D ₁ of the annular airflow passage to the diameter D ₀ of the storage portion by the weft storage device of the first embodiment of the present invention.
It is a graph showing a conventional ratio of blower speed and the current consumption in the case of changing the _{1 /} D _0.

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

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

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

[Explanation of symbols]

10 rotation axis 16 Holder 18 Weft storage drum 20 Storage 26, 32 groove 30 annular air flow path 34 Fixed cover 38 Thread part

Claims (2)

(57) [Claims] 1. A cylindrical storage drum fixed to a rotary shaft that rotates in synchronization with a main shaft of a loom, and a weft from the storage drum.
It is positioned coaxially in the front of the thread withdrawing direction,
Deflection of the yarn guide and storage for the rotation axis
And a holding portion which is fixed to the drum and coaxial, the reservoir de
On the cylindrical side surface of the ram, there is a storage part where the weft is wound.
However, the holding portion is connected to the edge portion of the storage drum and the yarn.
Side face of a truncated cone formed along the conical face connecting the guide and the end of the storage drum on this side face.
A weft formed coaxially at a position separated by a predetermined distance in the feeding direction.
Groove that forms a part of the annular air flow passage for rotating
And a weft insertion space is provided on the outer peripheral side of the holding portion.
While forming a thread guiding portion to cover the side surface of the truncated cone shape,
The annular airflow passage is provided at a position facing the groove portion of the holding portion.
A fixed cover provided with a groove portion constituting the above is provided.
A gas inlet for supplying airflow is connected to the annular airflow passage.
The center diameter of the annular airflow passage is equal to the outer diameter of the reservoir.
In contrast, it is formed to have a ratio of 0.4 to 0.85
Fluid jet loom weft storage device are. 2. The fluid jet weft storage device according to claim 1, wherein the ratio of the center diameter of the annular airflow passage to the outer diameter of the storage portion is set to a ratio of 0.5 to 0.7. .