JPH04136236A - Weft storage device in shuttleless loom - Google Patents

Abstract

PURPOSE:To respond to speedup of a loom by discharging an air stream in an annular air stream passage, formed from an outer peripheral groove of a stationary holding drum and an inner peripheral groove of a fixed cover and capable of forming the air stream in the same direction as the rotative direction of a storing drum after revolving nearly one turn. CONSTITUTION:A fixed cover 7 surrounding the outer peripheral surface of a stationary holding drum 13 attached through a bearing 5 to a rotating shaft 4 on which a storing drum 1 is secured on the picking side of the above-mentioned storing drum 1 with clearances 15 and 16 placed therebetween is arranged on the aforementioned outer peripheral surface in a weft storage device of a shuttleless loom. An annular air stream passage 6 for flowing an air stream round in the same direction as the rotative direction of the storing drum 1 is formed from an outer peripheral groove of the aforementioned stationary holding drum 13 and an inner peripheral groove of the above- mentioned fixed cover. The air stream admitted from a suction port 18 into the aforementioned passage 6 is simultaneously made to flow round the passage and revolve nearly one turn and then discharged from a discharge port 19 to reduce the pressure in the above-mentioned passage 6. Thereby, the flow velocity of the air stream in the aforementioned passage 6 can be increased to raise the number of revolutions of the loom.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a weft storage device for a shuttleless loom.

<Prior art> As a weft storage device for a conventional shuttleless loom, a storage drum is used, in which a storage portion on the base end side and a small diameter locking portion on the tip side are formed on a rotating shaft that rotates in conjunction with the main shaft of the loom. and a fixed cover surrounding the outer circumferential surface of the leading end of the storage drum with a gap therebetween, and an airflow circulating in the same direction as the rotational direction of the storage drum is formed between the locking part and the inner circumferential groove of the fixed cover. There is known a device in which an annular airflow passage is formed and the weft is pulled out from the storage portion of the storage drum through a gap between the drum and a fixed cover (see Japanese Utility Model Publication No. 59-22133).

<Problem to be Solved by the Invention> By the way, in such a weft storage device, the airflow that enters the annular airflow passage from the airflow inlet of the annular airflow passage travels in the same direction as the rotational direction of the storage drum. Since the air flows for approximately one revolution and then collides with the air inlet, the pressure within the annular air flow passage becomes too high, making it impossible to increase the flow velocity of the air flow within the passage.

As described above, the inability to increase the flow velocity of the airflow in the annular airflow passage leads to the inability to increase the rotational speed of the loom, which poses a problem in that it impedes improvement in the performance of the loom.

For this reason, conventionally, a plurality of exhaust ports communicating with the annular airflow passage are provided at predetermined intervals in the circumferential direction on the end wall at the tip of the storage drum, and air flow is provided from each part of the annular airflow passage through each exhaust port. airflow to the outside.

However, the airflow discharge structure in such a conventional weft storage device has the following problems.

That is, in order to lower the pressure inside the annular airflow passage, the airflow can flow through the annular airflow passageway in the same direction as the rotational direction of the storage drum for approximately one revolution, and then be discharged just before hitting the airflow inlet. However, in the conventional configuration described above, since the storage drum is rotating, it is not possible to determine the relationship between the position of the exhaust port provided on the storage drum and the position of the fixed airflow inlet. Airflow is also exhausted from the exhaust port. Therefore, extra airflow is required to be blown into the annular airflow passage, and as a result, it is necessary to increase the capacity of the blower, etc. for airflow supply, which is a huge waste of energy. There are some problems.

In view of the above-mentioned conventional problems, the present invention aims to improve the structure of the storage drum itself, and also employs a unique structure for the airflow discharge structure from the annular airflow passage, thereby solving the above-mentioned conventional problems. The purpose is to eliminate the points.

<Means for Solving the Problems> For this reason, the weft storage device for a shuttleless loom of the present invention has a storage drum fixed to a rotating shaft, and a stationary holding drum disposed on the weft insertion nozzle side of the storage drum. A fixed cover is attached to the rotating shaft via a bearing and surrounds the outer circumferential surface of the stationary holding drum with a gap, and the stationary holding drum outer circumferential groove and the fixed cover inner circumferential groove are arranged in the same direction as the rotational direction of the storage drum. An annular airflow passage is formed in which a circulating airflow is formed, and the weft is drawn out from the storage portion of the storage drum through a gap between the stationary holding drum and the fixed cover, and the annular airflow is flowed from the airflow inlet communicating with the annular airflow passageway. An exhaust port is provided at an end wall position of the stationary holding drum that goes around the passage, and a through hole that can correspond to the exhaust port is provided in an end wall of the storage drum that faces the end wall of the stationary holding drum.

<Function> In such a configuration, the weft yarn sent out by rotation of the storage drum or the rotating shaft is rotated by the airflow circulating in the same direction as the storage drum in the annular airflow passage. , wrapped around the storage portion of the storage drum.

When a predetermined time is reached, weft insertion is started, the weft stored in the storage section is pulled out, and weft insertion is performed directly. When weft insertion is completed, the next weft yarn is wound around the storage portion of the storage drum in the same manner as described above.

During the above operation, the storage drum is rotated with its end wall and the end wall of the stationary drum in close contact.

The airflow that enters the annular airflow passage through the airflow inlet port flows through the annular airflow passageway in the same direction as the rotational direction of the storage drum for approximately one revolution, and then is discharged from the exhaust port. This airflow is discharged only when the plurality of through holes formed in the storage drum rotate around the rotating shaft and overlap with the exhaust port.

According to the above configuration, the airflow that enters the annular airflow passage from the airflow inlet port flows through the annular airflow passageway for approximately one revolution in the same direction as the rotational direction of the storage drum, and then flows into the airflow inlet. Since the air is discharged from the exhaust port just before the collision, the pressure inside the annular airflow passage can be reduced.

As a result, it becomes possible to increase the flow velocity of the airflow in the annular airflow passage, making it possible to increase the number of revolutions of the loom, thereby improving the performance of the loom, as well as the amount of airflow supplied. This is advantageous in terms of energy saving.

<Example> Embodiments of the present invention will be described below with reference to the drawings.

The embodiment described below is a weft storage device for a shuttleless loom that measures the length of the weft required for one weft insertion and temporarily stores and waits for the weft.

That is, in FIGS. 1 to 4, a storage drum 1 is fixedly attached to a rotating shaft 4 that rotates in conjunction with the main shaft of the loom. A length measuring portion 11 and a storage portion 12 are formed on the circumferential surface of the storage drum 1, to which a press roller 10 of the length measuring device is pressed. The front end surface of the storage drum 1 is formed into a conical shape that gradually becomes smaller toward the weft insertion nozzle 22, which will be described later. A stationary holding drum 13 is disposed on the weft insertion nozzle 22 side of the storage drum l, and the stationary holding drum 13
is attached to the rotating shaft 4 via a bearing 5.

An annular concave groove 26 is formed on the outer peripheral surface of the stationary holding drum 13. The outer circumferential surface of the stationary holding drum 13 is a taper surface that is substantially continuous with the tapered end surface of the storage drum 1, and is formed into a conical tapered surface that narrows toward the weft insertion nozzle 22 side.

A fixed cup 7 is provided surrounding the static holding drum 13 and forming an annular airflow passage 6 therebetween. A substantially U-shaped concave groove 9 is formed in the inner peripheral surface of the fixed cover 7, and the annular airflow passage 6 is formed. An airflow inlet 18 from a blower (not shown) is formed on the outer circumferential surface of the fixed cover 7, and the airflow is blown into the annular airflow passage 6 so that it flows in the same direction as the rotation direction of the storage drum l. An air current that circulates in the direction is generated.

The inner peripheral surface of the fixed cover 7 is connected to the stationary holding drum 13.
It is formed into a conical tapered surface at the same angle and in the same direction as the outer peripheral tapered surface.

In this case, the outer peripheral surface of the stationary holding drum 13 and the fixed cover 7
A minute gap 15, 16 is formed between the inner circumferential surface and the inner peripheral surface.

The fixed cover 7 is fixedly attached to the frame of the loom via a fixing part (not shown).

Here, a groove 14a is formed on the inner circumferential surface of the stationary holding drum 13, and the groove 14a is recessed and extends diagonally in the outer circumferential direction.
A magnet 14 is fitted and fixedly attached to a. On the other hand, a groove 8a is formed in the distal end surface of the fixed cover 7 and is recessed and extends diagonally in the inner circumferential direction, and a magnet 8 is fitted into this groove 8a and is fixedly attached.

The direction of the poles of the magnet 14 on the stationary holding drum 13 side and the direction of the poles of the magnet 8 on the fixed cover 7 side are set so as to attract each other, and the attraction between the magnets 14 and 8 causes the fixed cover 7 to On the other hand, the stationary holding drum 13 is kept stationary.

On the other hand, on the extension of the axis of the rotating shaft 4, a yarn guide 17 is provided.
A gripper 21 and a weft insertion nozzle 22 are arranged downstream thereof in this order.

Here, an airflow inlet 18 communicating with the annular airflow passage 6
One short elliptical exhaust port 19 is provided in the end wall 25 of the stationary holding drum 13 that goes around the annular airflow passage 6 from the airflow passage 6. Furthermore, a plurality of small diameter through holes 20 are provided at predetermined intervals in the circumferential direction in the end wall 24 of the storage drum 1 facing the end wall 25 of the stationary holding drum 13 at positions corresponding to the exhaust ports 19. ing.

Next, the operation of this configuration will be explained.

First, the weft yarn 3 pulled out from the yarn feeder 2 shown in FIG. 2 is pressed against the length measuring section 11 of the storage drum 1 by the press roller 10 of the length measuring device to measure its length (send it out continuously at a predetermined speed). be done. The sent-out weft yarn 3 is stopped by a fixed guide 23 attached to the frame of the loom, and then passes from the storage section 12 of the storage drum l through the annular gap 15, 16 between the stationary holding drum 13 and the fixed cover 7. The yarn is drawn through the yarn guide 17, passes through the gripper 21 downstream of the yarn guide 17, and reaches the weft insertion nozzle 22.

Here, when the storage drum 1 is rotated by the rotation of the rotating shaft 4, the weft yarn 3 being pressed by the press roller 10 is sent out at a predetermined speed. The sent-out weft yarn 3 flows in the same direction as the storage drum 1 and is rotated by the air current circulating in the same direction as the storage drum 1 within the annular airflow passage 6, and is wound around the storage portion 12 of the storage drum 1.

When the predetermined time is reached, weft insertion starts, and first the storage section 12
The weft yarn 3 stored in the storage section 12 is pulled out, and then directly inserted into the weft without being stored in the storage section 12 via the fixed guide 23. When weft insertion is completed, the next weft is wound around the storage portion 12 of the storage drum l in the same manner as described above.

During the above operation, the storage drum l has its end wall 24
and the end wall 25 of the stationary holding drum 13 are rotated in close contact with each other.

Then, from the airflow inlet 18 of the annular airflow passageway 6, the passageway 6
The airflow that has entered the annular airflow passage 6 flows approximately once around in the same direction as the rotational direction of the storage drum 1, and then is discharged from the exhaust port 19. This airflow is discharged from the storage drum 1.
This is done only when the plurality of through-holes 20 formed in the exhaust port 19 rotate around the rotating shaft 4 and overlap with the exhaust port 19.

According to the above configuration, the airflow inlet 18 of the annular airflow passage 6
The airflow that has entered the passage 6 flows through the annular airflow passageway 6 for approximately one revolution in the same direction as the rotational direction of the storage drum l, and then passes through the exhaust port 19 immediately before colliding with the airflow inlet 18.
Since the air is discharged from the annular airflow passage 6, the pressure inside the annular airflow passage 6 can be reduced.

As a result, it becomes possible to increase the flow velocity of the airflow in the annular airflow passage 6, and it becomes possible to increase the rotational speed of the loom, thereby making it possible to improve the performance of the loom.

Incidentally, if the airflow is exhausted during one round of the annular airflow passage 6, the flow velocity of the airflow in the passageway downstream from the exhaust portion will decrease, which is undesirable.

Furthermore, according to this configuration, since the stationary holding drum 13 is fixed and the relationship between the position of the exhaust port 19 provided thereon and the position of the airflow blowing port 18 is specified, air can be removed from the necessary exhaust port 19. Since the airflow is discharged, there is no need for extra airflow to be blown into the annular airflow passage 6, and there is no need to increase the capacity of a blower or the like for supplying the airflow, and energy can be saved.

By the way, when considering the functions of each part of the storage drum 1, part A including the storage part 12 in FIG. 1 has the role of separating the stored yarn, and part B has the role of assisting the traction of the storage system. There is.

Therefore, the surface of part A should be smooth to improve separation performance. Also, the surface of part B should be rough to some extent in order to improve the traction performance.

Also, part A has a low tension and a soft surface (but does not wear out,
Part B has high tension and will wear if the surface is not hard.

Therefore, in the past, when determining the surface roughness, hardness, etc. of the storage drum, it was customary to sacrifice one or the other.

Therefore, in this embodiment, part A and part B are divided as follows, and the surface condition, material, hardness, or treatment are set separately.

That is, the surface condition of the A section is satin-like, and the material and hardness or treatment are approximately aluminum + marmite.

The surface condition of part B is a mirror surface, and the material and hardness or treatment are aluminum + ceramic coat, SUS + no surface treatment, heart chrome, ceramic coat).

<Effects of the Invention> As explained above, according to the weft storage device for a shuttleless loom of the present invention, the storage drum is fixed to the rotating shaft, and the stationary holding drum is arranged on the weft insertion nozzle side of the storage drum. is attached to the rotating shaft via a bearing, and a fixed cover is provided that surrounds the outer circumferential surface of the stationary holding drum with a gap, and the stationary holding drum outer circumferential groove and the fixed cover inner circumferential groove are arranged in the same direction as the rotational direction of the storage drum. An annular airflow passage is formed in which an airflow circulating in the airflow is formed, and the weft is drawn out from the storage portion of the storage drum through a gap between the stationary holding drum and the fixed cover, while the airflow in the passageway is drawn out from the airflow inlet of the annular airflow passageway. Since the airflow that has entered the annular airflow passage is made to flow approximately once around the inside of the annular airflow passage and then is discharged to the outside immediately before hitting the airflow inlet, the pressure inside the annular airflow passage can be reduced. It becomes possible to increase the speed of the airflow in the annular airflow passage to increase the rotational speed of the loom, which in turn makes it possible to improve the performance of the loom. In addition, by discharging the airflow from the necessary exhaust ports, there is no need for extra airflow to be blown into the annular airflow passage, and there is no need to increase the capacity of a blower or the like for airflow supply, resulting in energy savings. It is extremely useful.

[Brief explanation of drawings]

Fig. 1 is a partially cross-sectional side view showing an embodiment of the weft storage device for a shuttleless loom according to the present invention, and Fig. 2 is an explanatory diagram showing the main parts of the device shown in Fig. 1 as seen from the nozzle direction. , Figure 3 is the first
I-I in the figure [arrow sectional view, Figure 4 is IV-IV in Figure 1]
It is an arrow sectional view. Gap I3. , stationary holding drum 15,1618-Airflow inlet 19 Exhaust port through hole

Claims (1)

[Claims] fixing a storage drum to a rotating shaft, attaching a stationary holding drum disposed on the weft insertion nozzle side of the storage drum to the rotating shaft via a bearing, and surrounding the outer peripheral surface of the stationary holding drum through a gap; A cover is provided, and the stationary holding drum outer circumferential groove and the stationary cover inner circumferential groove form an annular airflow passage in which an airflow circulating in the same direction as the rotational direction of the storage drum is formed, and the weft is held stationary from the storage section of the storage drum. While it is configured to be pulled out through the gap between the drum and fixed cover,
An exhaust port is provided at an end wall position of the stationary holding drum that goes around the annular airflow passage from the airflow blowing port communicating with the annular airflow passage, and corresponds to the exhaust port on an end wall of the storage drum opposite to the stationary holding drum end wall. 1. A weft storage device for a shuttleless loom, characterized in that it is provided with a through hole that can