JPH0145055Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a knitting yarn knot detection switch in a flat knitting machine or the like.

Generally, in flat knitting machines, etc., in order to impart a certain tension to the knitting yarn that is fed out from the yarn tube to the knitting needles,
A top spring device equipped with a knot detection switch as shown in FIGS. 1 and 2 is used. That is, the ceiling spring device is constructed by attaching a yarn braking device 2, a knot detection switch 3, a ceiling spring 4, a stopper 5, yarn guide tubes 6 to 9, a terminal block 10, etc. to a frame 1, and a yarn tube (not shown). knitting yarn A fed out from (omitted)
A yarn braking device 2, a swing lever 11 for operating the switch, a yarn guide tube 6, a yarn guide tube 7, a top spring yarn guide tube 8,
The yarn is passed through the yarn guide tube 9 in this order, and is sent out to the knitting needle (not shown) side while being given a certain tension by the braking force of the yarn braking device 2 and the elasticity of the ceiling spring 4.

On the other hand, the swing lever 11 has an adjustment screw 1
2, the gap G between the lever pieces 11a and 11b can be adjusted to an appropriate size, and the thickness of the knitting yarn A can be adjusted to the gap G due to entanglement of knots and thread waste.
If the thickness exceeds the swing lever 1
1 moves in the direction of the arrow, and the knot detection switch 3 is activated. Further, at the same time as the knot detection switch 3 is activated, a lamp or a buzzer is used to display the knitting yarn A, and the feeding of the knitting yarn A is stopped, and yarn waste, knots, etc. are removed by the operator. 1 and 2, 13 is a top spring adjustment screw, 14 is a braking force adjustment screw, 15 is a swing lever support shaft, 16 is a stopper support shaft, and 17 is a switch fixing screw.

The conventional knot detection switch 3 is generally configured using a so-called click mechanism as shown in FIG. That is, a concave groove 19 is formed on the lower surface of one end of the swing lever support shaft 15 which is inserted through the switch case 18 and rotatably supported thereto.
Fix the contact actuating plate 19 having a
By rotating the switch 9 in conjunction with the swing lever 11, the switch contact 21 is opened and closed at its tip, and by adjusting the adjustment screw 22 to adjust the pressing force of the spring 24 applied to the ball 23. , the force required to drive the swing lever 11 in the direction of the arrow is adjusted. still,
In the figure, 25 is a stopper for the contact operating plate, 26
is an indicator light, 27 is a spring, 28 is a contact operating piece fixed to one end of the stopper support shaft 16,
When thread breakage occurs, it rotates in the direction of the arrow to close the switch contact 21.

However, since conventional knot detection switches use so-called mechanical contacts for the switch contacts 21, failures such as poor contact often occur. There is a problem in that it requires rotational force and it is difficult to accurately detect small knots. Furthermore, since a click mechanism is used, a slight change in the elastic force of the spring 24 causes a large change in the force required to drive the swing lever 11, and there is a problem that the adjustment is extremely delicate and requires a lot of effort. be. Further, when the swing lever 11 moves from the home position B to the switch operating position C, the reaction force (resistance force) applied thereto reaches its maximum just before the ball 23 comes out of the groove 19a of the contact operating plate 19.
That is, a large resistance force is generated on the swing lever 11 just before it reaches the operating position C of the switch, and as a result, when the thickness of the knot of the knitting yarn A is close to the set value of the gap of the swing lever 11, However, there is a problem in that the knot may forcefully slip through the gap in the swing lever 11, resulting in inaccurate operation of the switch. Furthermore, when the switch 3 is activated, the contact actuation plate 19 is held in the actuation position C by the spring 27, making automatic return of the swing lever 11 extremely difficult. As a result, it is necessary to perform the recovery manually, and many problems remain in terms of work efficiency.

The present invention aims to solve the above-mentioned problems with the knot detection switches of conventional flat knitting machines, etc., and there is no contact failure, and the operating force of the swing lever can be adjusted easily and accurately. , a flat knitting machine that does not cause unstable switch operation due to slipping of knots, etc., and also allows automatic return of the swing lever without the need for any special mechanism. The purpose of this invention is to provide a knot detection switch for use in, etc.

The present invention consists of a switch operating body that is rotatably supported within a switch case and has a magnet at one end; the upper end is fixed to the switch operating body or its support shaft, and an adjustable gap through which the knitting yarn is inserted. a magnetically sensitive element that performs a switching action when the magnet of the switch actuating body approaches; a swing lever having a tip portion formed as a magnet or a magnetic material, and facing the magnet of the switch actuating body and below it; The basic structure is an adjustment screw arranged so that the distance between the magnet and the magnet can be adjusted freely.The swing lever is held in a fixed position by the magnetic force acting between the magnet of the switch operating body and the tip of the adjustment screw. It is characterized in that the holding force is adjusted and the magnetic sensing element is operated by the magnet of the switch actuating body.

Further, with the above structure, there is no contact failure at the contact points, and the operating force of the swing lever can be adjusted easily and accurately. Furthermore, the reliability of the switch operation is improved, and the swing lever can be automatically returned to its original position very easily.

The details will be explained below based on an embodiment of the present invention shown in FIGS. 4 to 7. In FIGS. 4 to 7, the same reference numerals are used for the same parts as in FIGS. 1 to 3.

FIG. 4 is a cross-sectional view showing the state of the knot detection switch according to the present invention before operation (in the fixed position), and shows the outside of the swing lever support shaft 15 that penetrates the switch case 18 and is rotatably supported thereon. The upper end of the swing lever 11 is fixed to the end, and a switch operating body 20 is fixed to the inner end of the case of the support shaft 15. The switch operating body 20
A permanent magnet 29 of appropriate strength is fixed below the tip of the adjusting screw 22, and the tip of the adjustment screw 22 facing the permanent magnet 29 is made of a magnetic material. Therefore, by adjusting the tightening amount of the adjustment screw 22, the magnet 29
The magnetic attraction force between the and adjustment screw 22 changes, and thereby the magnitude of the force that drives the swing lever 11 in the direction of the arrow, that is, the force (attraction force) that holds the swing lever 11 in the fixed position B, is adjusted. Ru. In this embodiment, the tip of the adjusting screw 22 is made of a magnetic material, but a magnet having a different polarity from the magnet 29 may be fixed to the tip of the adjusting screw 22.

Reference numeral 30 denotes a magnetically sensitive element such as a reed switch or a Hall element, and when a permanent magnet 29 fixed to the switch operating body 20 approaches, the contact is opened and closed. In addition, in Figures 4 and 5, 2
6 is an indicator light, 28 is a contact operating piece fixed to the stopper support shaft 16 of the ceiling spring device, 31 is a stopper for the switch operating body, and 32 is a permanent magnet fixed to the contact operating piece.

Next, the operation of the knot detection switch according to the present invention will be explained.

As shown in FIG. 4, by adjusting the amount of tightening of the adjustment screw 22, the magnetic attraction force between the magnet 29 on the contact actuating body side and the adjustment screw 22, that is, the force that holds the swing lever 11 in a fixed position, can be increased. , has been adjusted to an appropriate value in advance. Similarly, the gap G through which the knitting yarn A of the swing lever 11 passes is also adjusted to an appropriate value.

Now, when the knot D of the knitting yarn A comes into contact with the swing lever 11, the knot D is attracted to the gap G of the swing lever 11 or moves in the direction of the arrow. At this time, as the swing lever 11 moves, the gap between the magnet 29 and the adjusting screw 22 increases, and the magnetic attraction force, that is, the reaction force acting on the switch operating body 20, rapidly decreases in inverse proportion to the square of the gap. As a result, the swing lever 11 is moved extremely lightly and yet reliably to the switch operation position C, and there is no chance that the knot D will forcefully slip through the gap G and the switch operation will become unstable. None.

When the swing lever 11 rotates to the switch operating position C, the permanent magnet 29 of the switch operating body 20
The magnetically sensitive element 30 is actuated, and the contacts are opened and closed. Further, when the swing lever 11 rotates to the switch operating position C, the gap G rises above the horizontal position of the knitting yarn A. As a result, the knot D is automatically removed from the gap G of the swing lever 11, and the knitting yarn A continues forward. However, since the feeding mechanism for the knitting yarn A is normally stopped at the same time as the detection switch 3 is activated, the knitting yarn A stops at a position where the knot D has slightly advanced forward from the swing lever 11.

Furthermore, when the knot D passes through the swing lever 11, the switch operating body 20 rotates clockwise due to its own weight and the magnetic attraction between the tip and the tip of the adjustment screw 22, and the swing lever 11 is moved to the operating position. Automatically returns from C to home position B. Therefore, there is no need to manually return the swing lever 11 after finishing the knot D of the knitting yarn A, etc., as in the past. If automatic return is not required, use the retaining spring 27 as shown in Figure 6.
Of course, it is also possible to maintain the operating state by using.

FIG. 7 shows another embodiment of the present invention, in which a permanent magnet 29 is fixed to the tip of the contact operating plate 19 of the click mechanism, and the magnetic sensing element 30 is actuated by the permanent magnet 29. It is.

As described above, the present invention generates a magnetic force between the tip of the switch operating body 20 and the tip of the adjustment screw 22, and this magnetic force causes the swing lever 11 to
Since the structure applies a force to hold the swing lever 11 in a fixed position, the holding force of the swing lever 11, that is, the force required to operate the swing lever, can be easily and accurately adjusted, and the knot D can be detected reliably. In addition, the automatic return of the swing lever 11 can be easily performed.

Furthermore, since a magnetically sensitive element is used in the switch mechanism, operational stability is significantly improved compared to conventional detection switches that use mechanical contacts.

The present invention has excellent practical utility as described above.

[Brief explanation of the drawing]

FIG. 1 is a side view of a top spring device for a flat knitting machine,
FIG. 2 is a partial plan view thereof. FIG. 3 is a schematic cross-sectional view of a conventional knot detection switch. FIG. 4 is a sectional view showing the knot detection switch according to the present invention in a normal state, and FIG. 5 is a sectional view showing it in operation. FIG. 6 is a sectional view of a knot detection switch according to a second embodiment of the present invention. FIG. 7 is a sectional view of a knot detection switch according to a third embodiment of the present invention. A...knitting yarn, B...fixed position of swing lever,
C...Switch operating position, D...Knot, G...
...Gap, 11... Swing lever, 15... Swing lever support shaft, 18... Switch case, 2
0...Switch operating body, 22...Adjustment screw, 29
...Permanent magnet, 30...Magnetic sensing element.

Claims (1)

[Scope of utility model registration request] Rotatably supported in the switch case 18,
Switch operating body 20 with a permanent magnet 29 at one end
and; the swing lever 11 having an upper end fixed to the switch actuating body 20 or its support shaft and having an adjustable gap G through which the knitting yarn A passes; and the permanent magnet 29 of the switch actuating body 20 coming close to each other. An actuated magnetic sensing element 30; the tip portion is formed as a magnetic material or a magnet, and is disposed opposite to and below the permanent magnet 29 of the switch operating body 20 so that the distance between the element and the permanent magnet 29 can be freely adjusted. A knot detection switch composed of an adjustment screw 22.