JPS6117972Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the configuration of a snail wire in a yarn guide section of a ring spinning machine, a ring twisting device, etc.
In particular, when the snail wire runs and passes, it comes into contact with the thread and generates a unique vibration, and this natural vibration is detected to detect the presence or absence of the running thread. It is constructed so that it can be obtained by

The present inventors have proposed various methods and means for yarn breakage detection means for ring spinning machines. These yarn breakage detection means focus on the fact that the snail wire attached to the rappet generates natural vibrations when it comes into contact with the spun yarn, and use a piezoelectric device attached to a part of the snail wire to generate natural vibrations. It is detected by an element. That is, FIG. 1 is a schematic side view showing one spindle of a ring spinning machine equipped with a thread breakage detection means, in which the front bottom roller 1 is
The fleece fed out by the top roller 1a is twisted into yarn Y, which is wound onto a bobbin 9 through a snail wire 3 supported by a lappet 2 attached to a lappet bar 4. Further, during winding, the winding is performed via a traveler 8 that is loosely fitted into a ring 6 that surrounds the bobbin 9 and moves up and down, and the traveler 8 follows the rotation of the bobbin 9.
The tube yarn 10 is formed by twisting the yarn while rotating. Note that 7 is a ring rail and 5 is a balloon control ring. In such a spindle, as the yarn breakage detection sensor, the snail wire 3 is inserted into a cylinder 14 made of an insulating material via an elastic material 15, as illustrated as 11 in FIG.
A piezoelectric element 16 is attached to the rear end side of the wire 3. In order to ensure the attachment and detection of the piezoelectric element, the rear end side of the wire 3 is made into a flat part 3a, and the edge thereof is further formed with a thin step part 3b to allow the lead wire 17 of the piezoelectric element 16 to be taken out. It's easy.

When attaching the thread breakage detection sensor 11 configured in this way to the rappet 2, a sliding step 2a is formed at the bottom of the rappet 2 as shown in FIG.
The lead wire 17 of the piezoelectric element 16 is connected to a detection and measurement device via a conductive plate 12 that is insulatively disposed on the mounting surface of the rappet bar 4 and rappet 2. The conductive plate 12 is preferably a printed wiring board. Note that 13 is an insulating plate that connects the lead wire 1.
7 passes through the mounting portion of the rappet 2 and the insulating plate 13 and is connected to the conductive plate 1. On the other hand, as a detection means, as shown schematically in FIG.
the piezoelectric element 1 ) is connected to the bandpass amplifier 18 .
The signal from 6 is selected by the natural vibration frequency of the snail wire, and then amplified by an amplifier 19 to a level that can be easily determined.
0 converts an AC signal into a DC signal.
The voltage comparator 21 is configured to determine a region of reliable operation and output a logic signal output 22. In addition, when taking out these signals, in order to sensitively operate the piezoelectric element 16 attached to the snail wire 3, an arc-shaped or thin groove-shaped groove is formed in the flat part 3a, as illustrated in FIGS. 5 and 6. Groove 3c
It is recommended to form a thin piece part on a part of the flat part 3a, and the thin piece part is formed on the entrance side where the running yarn comes into contact with the snail wire 3 as shown in FIG. In the illustrated example, it is formed on the upper surface side. Moreover, the piezoelectric element 16 arranged in this way
The snail wire 3 is made of a rectangular thin piece along the flat part 3a of the snail wire 3, and the flat part 3a of the snail wire 3 is
It is attached to the A side, terminals are formed on the rear end side, and lead wires are soldered to the respective terminals.

By the way, since the piezoelectric element 16 is made of extremely brittle crystalline material such as Rothsiel's salt or barium titanate, great care must be taken when handling the snail wire to which it is attached. However, even if sufficient care is taken, some of the piezoelectric elements 16 may be damaged, and it takes time and effort to search for these weights. From these facts, it is necessary to investigate the cause of the breakage and to take countermeasures against it. The present invention was arrived at as a result of intensive research on these issues, and by changing the method for attaching the piezoelectric element to the snail wire, it is possible to prevent the piezoelectric element from breaking and to create a thread that can be used stably over a long period of time. This paper attempts to provide a break detection snail wire. However, in this invention, the piezoelectric element attached to the opposite side of the wire to the yarn guide portion is a rectangular thin piece along the axial direction of the wire, and the piezoelectric element is attached to the wire by running it against the wire. It is constructed by being attached on the opposite side to the direction in which the yarn enters.

The present invention will be explained in detail below based on the drawings, but the drawings show one example of the concrete implementation of the present invention, and the present invention is not limited to these illustrated examples, and may be applied to snail wires of other shapes. Alternatively, the same implementation can be achieved by changing the shapes of the component parts. That is, the sensor 11 attached to the lappet 2 has a snail wire 3 connected to the cylinder 1 as explained in FIG.
The running yarn is inserted into the snail wire 4 through an elastic member 15 and acts on the snail wire 3, and the snail wire 3 is rubbed so as to be biased in the direction of the arrow A. Furthermore, when the yarn is wrapped around the snail wire 3, a tensile force in the same direction acts, and the roving bobbin or spinning tip may be dropped, giving the snail wire 3 an impact in the same direction of arrow A. . Such operation and impact bend the flat part 3a of the snail wire 3 as shown by the arrow line B, as shown in FIG. Become. Furthermore, such a phenomenon is more likely to occur in a structure in which the terminal joint portion of the piezoelectric element 16 is buried in another soft elastic material. On the other hand, since the piezoelectric element 16 is composed of a rectangular thin piece along the flat part 3a of the snail wire and is bonded, it cannot respond to the bending elasticity of the flat part and may break, as shown by 16a in FIG. Divided. The inventor of the present invention investigated breakage of the piezoelectric element and found that it is weak against expansion as shown in FIG. 7, but has considerable resistance to compression. For this purpose, we focused on the fact that breakage can be prevented by attaching the piezoelectric element 16 to the snail wire 3 on the inner surface of the bending line B, that is, on the opposite side (lower surface side) to the direction of yarn entry of the snail wire. It is. FIG. 8 shows a sensor using snail wire to which the present invention is applied. That is, the snail wire 3 and the cylinder 14 are the same, and the piezoelectric element 16 is attached to the lower surface of the flat part 3a. In the figure, the flat portion 3a
In forming the flat part 3a, a flat thinned part is formed on the lower surface side, but as shown in FIG.
This can be done in the same way by pasting it on the bottom surface of the . However, when forming the groove 3c as described above,
The grooves 3c may be formed on the surface opposite to the piezoelectric element mounting surface, and may be a plurality of arcuate grooves as shown in FIG. 9, or may be rectangular grooves 3c as shown in FIG. With the snail wire of the present invention configured in this way, the natural vibration can be detected as sensitively as the conventional one, and the piezoelectric element is extremely less likely to break due to the bending. We were able to create a thread breakage detection snail wire that can be used safely for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view illustrating a thread breakage detection means of a ring spinning machine, FIG. 2 is a schematic diagram illustrating the detection means, and FIG. 3 is an enlarged view of the main part of FIG. 1, with a part cut away. FIG. 4 is a side view of a sensor forming a part of FIG. 3, with a portion cut away. 5 and 6 are side views showing other configuration examples of the flat part of the snail wire, FIG. 7 is an explanatory view of the operation, FIG. 8 is a partially cutaway side view of a sensor to which the present invention is applied, and FIG. 9 and the first
FIG. 0 is a side view showing a part of another configuration example in FIG. 8. 1... Front bottom roller, 2... Rappet, 3... Snail wire, 3a... Flat part, 4
... Rappet bar, 5 ... Balloon control ring, 6 ... Ring, 7 ... Ring rail, 8
... Traveler, 9 ... Bobbin, 10 ... Package, 11 ... Sensor, 12 ... Conductive plate, 13
... Insulating plate, 14 ... Cylindrical body, 15 ... Insert elastic material, 16 ... Piezoelectric element, 17 ... Lead wire, 18
... Bandwidth amplifier, 19 ... Amplifier, 20 ... Smoother, 21 ... Comparator, 22 ... Logical signal output.

Claims (1)

[Scope of utility model registration request] A snail wire that is arranged so as to be in contact with a running thread, and detects the presence or absence of a running thread by detecting the natural vibration generated in the snail wire in contact with the thread, and the thread guide of the wire. The piezoelectric element attached to the opposite side of the wire is a rectangular thin piece along the axial direction of the wire, and the piezoelectric element is attached to the side opposite to the direction of entry of the yarn running with respect to the wire. Thread breakage detection snail wire.