JPH0145054Y2 - - 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 tension device with a knot detection switch is utilized. That is, the spring tension device includes a frame 1, a thread braking device 2, a knot detection switch 3, as shown in FIGS.
It is configured by attaching a top spring 4, a stopper 5, yarn guiding tubes 6 to 9, a terminal block 10, etc., and the knitting yarn A let out from the yarn tube (not shown) is controlled by a yarn braking device 2,
The swing lever 11 for operating the switch, the yarn guide tube 6, the yarn guide tube 7, the top spring yarn guide tube 8, and the yarn guide tube 9 are inserted in this order, and a certain level is maintained by the braking force of the yarn braking device 2 and the elasticity of the top spring 4. With tension imparted,
It is sent out to the knitting needle (not shown) side.

On the other hand, the swing lever 11 has an adjustment screw 1
2 allows the gap between the lever pieces 11a and 11b to be set to an appropriate size, and when the thickness of the knitting yarn A exceeds the set value due to knots, tangles of thread waste, etc. , swing lever 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 displayed and the feeding mechanism for the knitting yarn A is stopped, and thread 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 usually constructed using a so-called click mechanism as shown in FIGS. 3 and 4. That is, switch case 1
A contact operating plate 19 having a groove 19a on the lower surface is fixed to one end of the swing lever support shaft 15 which is rotatably supported through the swing lever support shaft 15 through which the operating plate 19 is interlocked with the swing lever 11. By rotating it, the switch contact 21 is opened and closed at its tip, and the ball 2 is adjusted by adjusting the adjustment screw 22.
By adjusting the pressing force of the spring 24 applied to the lever 3, the force necessary to drive the swing lever 11 in the direction of the arrow can be adjusted. In the figure, 25 is a stopper for the actuating plate, 26 is an indicator light, and 2
7 is a spring, and 28 is a contact operating piece fixed to one end of the stopper support shaft 16, which rotates in the direction of the arrow to close the switch contact 21 when thread breakage occurs.

However, in the conventional knot detection switch using a click mechanism, the force required to drive the swing lever 11 changes greatly due to a slight change in the elastic force of the spring 24, and the adjustment is extremely delicate. There is a problem in that it requires a lot of work. In addition, the reaction force (resistance force) applied when the swing lever 11 moves from the home position B to the switch operating position C is caused by the ball 23 acting on the contact operating plate 19.
It reaches its maximum value just before it comes out of the groove 19a. 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 forcefully slips through the gap in the swing lever 11, resulting in inaccurate operation of the switch. Furthermore, when the switch 3 is activated, as shown in FIG. 4, since the contact actuation plate 19 is held in the actuation position C by the spring 27, automatic return of the swing lever 11 is extremely difficult. Become. As a result, it is necessary to perform the recovery manually, which leaves many problems in terms of work efficiency.

The purpose of this invention is to solve the above-mentioned problems with knot detection switches of conventional flat knitting machines, etc., and it is possible to easily and accurately adjust the operating force of the swing lever, and to prevent knots from slipping. This is a knot detection switch used in flat knitting machines, etc., which prevents the switch operation from becoming unstable and allows automatic return of the swing lever to be carried out extremely easily without the need for any special mechanism. The purpose is to provide the following.

The present invention includes: a swing lever support shaft rotatably supported on a switch case; a swing lever having an upper end fixed to the swing lever support shaft and having an adjustable gap through which knitting yarn is inserted; A contact actuating body fixed to the lever support shaft; A switch contact that opens or closes when the contact actuating body comes into contact with the contact actuating body; Opposed to the lower part of the tip of the contact actuating body and disposed such that the gap therebetween can be freely adjusted. A magnetic pole is provided below the tip of the opposing contact actuating body and at least one of the tip of the adjustment screw to generate a magnetic attraction force between the two, and the magnetic force generates a magnetic attraction force between the two. The basic idea is to adjust the force that holds the swing lever in place.

Furthermore, with the above configuration, the operating force of the swing lever can be adjusted easily and accurately, and
The reliability of the switch operation is increased, and the swing lever can be automatically returned very easily.

The details will be explained below based on an embodiment of the present invention shown in FIGS. 5 to 8. In FIGS. 5 to 8, the same reference numerals are used for the same parts as in FIGS. 1 to 4.

FIG. 5 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 contact operating body 20 is attached to the tip of the case of the support shaft 15.
is fixed. A permanent magnet 29 of appropriate strength is fixed below the tip of the contact operating body 20, and the tip of the adjustment screw 22 facing the permanent magnet 29 has a permanent magnet 29 fixed thereto.
A permanent magnet 30 having a different polarity from the permanent magnet 29 is fixed to the permanent magnet 29, and the distance L between the two magnets 29 and 30 is changed by adjusting the amount of tightening of the adjustment screw 22.
This adjusts the magnitude of the force that drives the swing lever 11 in the direction of the arrow, that is, the force that holds the swing lever 11 in the fixed position B (suction force).
In this embodiment, a combination of the permanent magnet 29 and the permanent magnet 30 is used, but the contact actuating body 2
Since it is only necessary that a magnetic attraction force be applied between the lower tip of the screw 22 and the tip of the adjustment screw 22, it goes without saying that either one side may be a permanent magnet and the other side may be a magnetic material. In addition, in Figures 5 and 6, 2
1 is a switch contact, 26 is an indicator light, 28 is a contact operating piece fixed to the stopper support shaft 16 of the ceiling spring device, and 31 is a stopper for the contact operating body.

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

As shown in FIG. 5, by adjusting the amount of tightening of the adjustment screw 22, the attraction force between the magnet 29 on the contact actuating plate side and the magnet 30 on the adjustment screw 22 side, that is, the swing lever 11 can be adjusted to the fixed position. The holding force is 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, since the distance L between the magnets increases as the swing lever 11 moves, the attractive force, that is, the reaction force acting on the contact actuating body 20, rapidly decreases in inverse proportion to the square of the distance L. As a result, swing lever 1
1 will be moved extremely lightly and yet reliably to the switch operating position G, and the knot D will be moved to the gap G.
There is no chance that the switch will become unstable due to slipping through the inside.

When the swing lever 11 rotates to the switch operating position C, the swing lever 11 rises to the position shown by the solid line in FIG. 7, so that the knot D comes out of the gap G and moves forward. However, since the knitting yarn A feeding mechanism is normally stopped at the same time as the detection switch 3 is activated, the knot D is
The progress of the knitting yarn A stops at a position slightly forward from 1.

Further, when the knot D passes the swing lever 11, the contact actuating body 20 moves downward due to the magnetic attraction between the tip of the contact actuating body 20 and the tip of the adjusting screw 22, and the swing lever 11 is moved to the actuating position C. automatically returns to the home position B. Therefore, as before, after completing the processing of knots D etc. of knitting yarn A,
There is no need to manually return the swing lever 11. In addition, if automatic recovery is not required,
Of course, the operating state may be maintained using a retaining spring 27 as shown in FIG.

As described above, the present invention generates a magnetic force between the tip of the contact operating body 20 and the tip of the adjustment screw 22, and this magnetic force imparts a force to hold the swing lever 1 in a fixed position. Because it is configured as
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 stability of the switch operation is significantly improved, and the automatic return of the swing lever 11 is also easy. I can do it.

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. Figures 3 and 4
The figure is a cross-sectional view showing a conventional knot detection switch when it is in normal operation and when it is in operation. FIG. 5 is a sectional view showing the knot detection switch according to the present invention in a steady state;
FIG. 6 is a sectional view showing the special operation state. FIG. 7 is an explanatory diagram showing the engagement relationship between the gap of the swing lever and the knitting yarn A. FIG. 8 is a sectional view showing another 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... Contact operating body, 21... Contact, 29, 30...
...Permanent magnet, 31...Stopper.

Claims (1)

[Scope of utility model registration request] A swing lever support shaft 15 rotatably supported on a switch case 18; A swing lever 11 whose upper end is fixed to the swing lever support shaft 15 and has an adjustable gap G through which the knitting yarn A is inserted.
a contact operating body 20 fixed to the swing lever support shaft 15; a switch contact 21 that opens or closes when the contact operating body 20 comes into contact; A magnetic pole is provided below the tip of the opposing contact actuating body 20 and at least one of the tip of the adjusting screw 22, so that the gap L between the two A knot detection switch that holds the swing lever 11 in a fixed position by the magnetic attraction between the two.