JPH073577A - Weft detector in jet loom - Google Patents

Abstract

PURPOSE:To provide the detector designed to prevent sticking of foreign substances to both light-projecting and light-receiving elements without affecting wefts. CONSTITUTION:An air blow block 10 is stationarily attached to the lower end of a holder 13 to be housed with both light-projecting and light-receiving elements 15. The air blow block 10 is also provided with a light-passable hole 10a and the upper opening of this hole 10a is covered with a converging lens 16. A fitting 11 is connected to the connecting hole 10b of the air blow block 10. The bottom of the connecting hole 10b is penetratingly provided with plural air blow holes 10c1-10c4 so as to open on the light-passable bole 10a. The air flow P from the air blow holes 10c1-10c4 is passed just under the lower surface of the converging lens 16 and goes toward a blow-off hole 10d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft measuring and storing device of a winding type in which a weft yarn wound and stored on a yarn winding surface is injected and wefted by a jetting action of a weft insertion nozzle, and pulled out from the yarn winding surface. The present invention relates to a weft detection device in a jet loom equipped with a photoelectric sensor type weft detection device that detects the unwound yarn.

[0002]

2. Description of the Related Art A weft detecting device used in a winding type weft measuring and storing device detects the unwinding of a weft drawn and unwound from a yarn winding surface. By the detection of the unraveling, the number of unraveling is counted, and the weft withdrawing control of a predetermined length is performed based on the count result.

In this kind of weft yarn detecting device, foreign matter (such as cotton wool and yarn treatment agent) on the light emitting surface of the light emitting element and the light receiving surface of the light receiving element.
Adhesion of the yarn reduces the yarn detection accuracy. If the yarn detection accuracy is lowered, erroneous detection is likely to occur in the unwinding count, and a weft insertion error such as an excess or shortage of the weft insertion length occurs.

A device for preventing foreign matter from adhering to the light-projecting surface and the light-receiving surface is disclosed in Japanese Utility Model Laid-Open No. 53-83780 and JP-A 61-2.
It is disclosed in Japanese Patent No. 8051 and Japanese Patent Laid-Open No. 3-249242.

In the apparatus disclosed in Japanese Utility Model Laid-Open No. 53-83780, air is blown to the light projector and the light receiver to prevent foreign matter from adhering to the light emitting surface and the light receiving surface. JP-A-6
In the device of JP-A 1-28051, an air flow is formed around the detection area of a photoelectric sensor having a detection area on the thread winding surface of a winding type weft measuring and storing device, and the light emitting and receiving surface and the detection area of the photoelectric sensor are formed. Foreign matter is prevented from adhering to the.

In the device disclosed in Japanese Patent Laid-Open No. 3-249242, the light emitter and the light receiver of the photoelectric sensor having the detection region on the yarn winding surface of the winding type weft measuring and storing device are housed in the covering member, and the light emitter and the light receiver are received. Air is jetted from the inside of the covering member along the optical axis of the container. Therefore, foreign matter is prevented from entering the inside of the covering member, and foreign matter is prevented from adhering to the light projecting surface and the light receiving surface.

[0007]

However, in each of the devices of these publications, the air flow intersects with the weft path, and the behavior of the weft is affected by the air flow. If the weft yarn drawn and unwound from the winding type weft measuring and storage device intersects the air flow, it will affect the weft speed, bending, fluffing, dust drop, balloon shape, etc., and is suitable for good weft insertion. The smooth weft flying behavior is hindered.

Further, in the structure in which the air flow is directly blown to the light projecting surface and the light receiving surface as in the apparatus of Japanese Utility Model Laid-Open No. 53-83780, there is a possibility that foreign matter may adhere to the light projecting surface or the light receiving surface.

The present invention provides a weft detecting device capable of preventing foreign matter from adhering to the light projecting element and the light receiving element of the weft detecting device without affecting the behavior of the weft in the winding type weft measuring and storing device. The purpose is to

[0010]

Therefore, according to the present invention,
Photoelectric sensor type that detects the weft yarn that is unwound from the yarn winding surface by inserting and wetting the weft yarn that has been wound and stored around the yarn winding surface of the winding type weft measuring and storing device by the jetting action of the weft insertion nozzle. Targeting the weft detection device, the light projecting element and the light receiving element of the weft detecting device are covered with a covering member, and a light passing hole is provided in the covering member along the optical axis region from the light projecting element to the light receiving element. The light passage hole is provided outside the sweep area of the weft that is pulled out and unwound from the surface, and the air passage generation means is provided in the light passage hole to generate an air flow in a direction substantially orthogonal to the optical axis.

[0011]

The foreign matter can reach the light projecting element and the light receiving element only in the light passage hole, but an air flow is generated in the light passage hole. This air flow prevents foreign matter from adhering to the light projecting element and the light receiving element covered with the covering member. The air flow generated in the light passage hole is outside the sweep area of the weft drawn and unwound from the winding surface, and the behavior of the unwind weft is not affected by the air flow.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment embodying the present invention will now be described with reference to FIGS.
It will be described with reference to FIG. Reference numeral 1 shown in FIGS. 1 and 2 denotes a winding type weft measuring and storing device, in which a weft Y is wound and stored on a winding surface 3 by rotation of a winding tube 2. A cover 4 is provided around the rotation region of the bobbin tube 2. A support bracket 5 is attached to the top of the cover 4, and an electromagnetic solenoid 6 is supported by the support bracket 5. The locking pin 6a driven by the electromagnetic solenoid 6 contacts and separates from the bobbin winding surface 3 in synchronization with the weft insertion timing. Weft yarn Y wound and stored on the winding surface 3
Is released and unwound by the jetting action of the weft inserting main nozzle 7 in a state where it is released from the latching action of the latch pin 6a.

A sensor base 8 is fixed to the electromagnetic solenoid 6, and a weft detection device 9 is attached to the sensor base 8. An air blow block 10 is fixed to the lower end of the weft detecting device 9.

As shown in FIGS. 3 and 4, the weft detecting device 9
Is composed of a cylindrical holder 13, and a light projecting element 14 and a light receiving element 15 housed in the holder 13. The lower end of the holder 13 is open, and the air blow block 10 fixed to the lower end of the holder 13 has a light passage hole 10a.
It is transparently provided so as to be continuous with the opening. That is, the holder 1
3 and the air blow block 10 serve as a covering member that covers the light projecting element 14 and the light receiving element 15.

A converging lens 16 is mounted and fixed on the upper opening of the light passage hole 10a, and the focal position of the converging lens 16 is set on the thread winding surface 3. A reflecting mirror 17 is installed at the focal position of the converging lens 16. Projection element 14
The light projected from the converging lens 16 is reflected by the reflecting mirror 17.
Converge on top. The reflected light from the reflecting mirror 17 is convergent lens 1
The light is transmitted through 6 and is received by the light receiving element 15. That is,
An optical axis L from the light projecting element 14 to the light receiving element 15 passes through the light passage hole 10a and is substantially orthogonal to the reflecting mirror 17. Bobbin winding surface 3
The weft Y unwound and unwound from is detected by the weft detection device 9 when passing over the reflecting mirror 17. This detection information is used to count the number of times the weft is unwound.

The air blow block 10 is separated from the bobbin winding surface 3, and the weft yarn Y unwound and unwound from the bobbin winding surface 3 is swept between the air blow block 10 and the bobbin winding surface 3 without contacting the air blow block 10. Have.

Light is projected together with the holder 13 and the converging lens 16.
An air probe block that seals the element 14 and the light receiving element 15.
A connection hole 10b is formed on the side surface of the
A pipe joint 11 is screwed into the hole 10b. Connection hole 10
a plurality of air blow holes 10c at the bottom of b₁, 10c₂，
10c₃, 10c_FourOpen on the peripheral wall of the light passage hole 10a.
It is so transparent. Each air blow hole 10c₁-10
c_FourAre parallel to each other and orthogonal to the light passage hole 10a
is doing. Air blow hole 10c₁-10c_FourThe diameter of
From the distance between the bottom of the continuous hole 10b and the peripheral wall of the light passage hole 10a
Is also small. Air blow hole with such a pore shape
10c₁-10c_Four3 out of 10c ₁, 10c₂，
10c₃Is on a plane orthogonal to the light passage hole 10a, and the remaining
One of them is near the lower surface of the converging lens 16. And
Air blow hole 10c located in the center of the left and right₂, 10c_Four
Is directed to the central axis of the light passage hole 10a. Therefore,
Air blow hole 10c₁-10c₃The directional line of
The light passage hole 10a is formed immediately below the lens 16 on the orthogonal cross section.
Divide evenly.

[0018] are Toru設over the side surface of the air blowing block 10 from the peripheral wall of the air blow holes 10c ₁ ~10c ₄ blowing to the directivity direction hole 10d is light passing hole 10a. An air pipe 12 is connected to the pipe joint 11.
The air pipe is connected to a pressure air supply source (not shown), and the pressure air of the pressure air supply source is supplied to the air blow block 1.
0 is supplied into the connection hole 10b. Supplied pressurized air into the connection hole 10b is ejected toward the hole 10d discharged from the air blow holes 10c ₁ ~10c ₄ as indicated by an arrow P in FIG.

Although each of the air blow holes 10c _{1 to} 10c ₄ is a fine hole having a high flow rectifying action, the air flow P ejected from these holes diffuses to some extent. Due to this diffusion, the air flow P forms an air curtain in a direction substantially orthogonal to the optical axis at a position close to the outer surface of the converging lens 16. Air blow hole 10c ₄
The air flow from the air blows the bottom surface of the converging lens 16 slightly. Foreign matter such as cotton wool and thread treatment agent is used as the light passage hole 10a.
Penetrates into the light passage hole 10a through the lower opening. If such a foreign substance adheres to the lower surface of the converging lens 16, the detection accuracy of the weft yarn detecting device 9 will decrease, and a miss count of weft unwinding will occur.

The air flow P from the air blow holes 10c _{1 to} 10c ₄ blows out the foreign matter that has entered the light passage hole 10a toward the blowing hole 10d side, and prevents the foreign matter from adhering to the lower surface of the converging lens 16. Air flow P from air blow hole 10c ₄
Is along the lower surface of the converging lens 16 and is not directly sprayed on the lower surface of the converging lens 16. Therefore, the foreign matter is not sprayed on the lower surface of the converging lens 16,
No foreign matter adheres to the lower surface of the converging lens 16.

A weft Y which is pulled out and unwound from the winding surface 3
Sweeps near the bobbin winding surface 3. The light passage hole 10a is located outside the sweep area of the weft Y that is pulled out and unwound, and the air flow P does not interfere with the sweep area of the weft Y. Therefore, the weft Y that is pulled out from the winding surface 3 and unwound
Is not affected by the air flow P, and the weft Y is unwound smoothly. If the unwinding of the weft Y is smooth,
A smooth weft flying behavior suitable for good weft insertion is maintained.

The present invention is, of course, not limited to the above-mentioned embodiment, and the embodiments shown in FIGS. 5 to 8 are also possible. In this embodiment, as shown in FIGS. 5 and 6, the weft detection device 18 is placed and fixed on an air duct 19, and the air duct 19 is supported by being tightened by a screw 20 on an electromagnetic solenoid 6. The lower part of the air duct 19 is along the bobbin winding surface 3, and the weft detection device 18 is placed at this lower position.

As shown in FIGS. 7 and 8, the weft detecting device 1
Reference numeral 8 includes a holder 21, and a light projecting element 22 and a light receiving element 23 in the holder 21. A light passage hole 19a is provided in the lower portion of the air duct 19, and an upper opening of the light passage hole 19a is covered with a transparent plate 24. The light projecting element 22 and the light receiving element 23 are located directly above the transparent plate 24, and the light projected from the light projecting element 22 passes through the transparent plate 24 and is reflected by the reflecting plate 1.
The reflected light is reflected at 7, and the reflected light is transmitted through the transparent plate 24 and is received by the light receiving element 23.

Inside the air duct 19, a thin air passage 19b is provided in the thickness direction of the adduct 19. The air passage 19b starts from the upper part of the air duct 19 and starts from the light passage hole 1
9a, the width of which is substantially equal to the diameter of the light passage hole 19a. A blowing hole 19c is provided in the direction of the air passage 19b.
Penetrates from the light passage hole 19a to the lower end. The directional direction of the air passage 19b intersects the optical axis L. The pipe joint 11 is connected to the upper side surface of the air duct 19,
Pressure air from a pressure air supply source (not shown) is supplied to the air pipe 12.
And to the air passage 19b via the pipe joint 11.

The air passage 19b is narrower than its length and has a high rectifying action. Therefore, the air flow Q ejected from the air passage 19b does not diffuse so much and the blowout hole 1
Blow through 9c. The air flow Q runs along the entire lower surface of the transparent plate 24, and the foreign matter entering the light passage hole 19a is discharged from the blowing hole 19c by the air flow Q. Transparent plate 2
4 is slightly retracted upward from the passage area of the air flow Q,
The air flow Q does not blow on the transparent plate 24. Therefore, the foreign matter does not adhere to the transparent plate 24, and the detection accuracy of the weft posting device 18 does not decrease.

The weft Y, which is pulled out and unwound from the bobbin winding surface 3, rubs against the lower lower surface of the air duct 19 and the light passage hole 1
Not only for the air flow Q in 9a, but also for the blow hole 1
It does not interfere with the air flow blown from 9c. Therefore, the behavior of the weft Y is not affected by the air flow.

Further, the present invention can be applied to a transmission photoelectric sensor type weft yarn detecting device as disclosed in Japanese Patent Laid-Open No. 3-249242.

[0028]

As described above in detail, according to the present invention, the light projecting element and the light receiving element are covered with the covering member, and the light passing hole is provided in the covering member along the optical axis region extending from the light projecting element to the light receiving element. ,
Since the light passage hole is provided outside the sweep area of the weft that is unwound and unwound from the winding surface, an air flow is generated in the light passage hole substantially orthogonal to the optical axis. This has an excellent effect that foreign matter can be prevented from adhering to the light projecting element and the light receiving element without affecting the behavior of the weft that is pulled out and unwound.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment embodying the present invention.

FIG. 2 is a front view corresponding to FIG.

FIG. 3 is an enlarged vertical sectional view of an essential part.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a side view showing another example.

FIG. 6 is a front view corresponding to FIG.

FIG. 7 is an enlarged vertical sectional view of an essential part.

8 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

9 ... weft detecting device, 10 ... Air Blow block comprising a covering member, 10a ... light transmitting hole, 10c _1, 10c _2, 10
c ₃ 10 c ₄ ... Air blow holes constituting air flow generating means, 13 ... Holder serving as a covering member, 14 ... Projector element, 1
5 ... Light receiving element.

Claims (1)

[Claims] Claim: What is claimed is: 1. A weft yarn length measuring and storing device of a winding type, wherein a weft yarn wound and stored on a yarn winding surface is injected and wefted by a jetting action of a weft insertion nozzle, and a weft yarn that is unwound from a yarn winding surface is unwound In a jet loom equipped with a photoelectric sensor type weft detecting device for detecting, the light emitting element and the light receiving element of the weft detecting device are covered with a covering member, and the covering member is formed along the optical axis region from the light emitting element to the light receiving element. An air that forms a light passage hole, and the light passage hole is provided outside the sweep area of the weft drawn and unwound from the winding surface, and an air flow is generated in the light passage hole in a direction substantially orthogonal to the optical axis. A weft detection device in a jet loom provided with a flow generating means.