JPH0444524Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention detects the position of the lower end of the loop of a rewinding device or a winding device, and based on this detects the position of the loop, the loop starts or stops in these devices. Regarding the detection switch.

[Prior Art] FIG. 11 is a front view showing a rewinding device and a loop detection switch disposed therein.

A coil material 2 is placed between a press feeding device (not shown) and an unwinding device 1 that supplies the coil material 2 thereto.
A loop 3 is formed. The lower end 3a of this loop 3 moves downward when the drive motor (not shown) of the rewinding device 1 continues to be driven, and moves upward when the drive motor continues to be stopped. Lower end 3 of loop 3
In order to regulate the upper limit position A and the lower limit position B of the loop 3, a loop detection switch 4 is arranged in the rewinding device 1 to detect the position of the lower end 3a of the loop 3 and start or stop the drive motor based on this. ing.

FIG. 12 is a perspective view showing the external structure of the loop detection switch, and FIG. 13 is a perspective view showing the internal structure of the loop detection switch.

This loop detection switch 4 has a rotating shaft 6 rotatably provided in a case 5, one end fixed to the end of the rotating shaft 6 protruding from the case 5 via a holder 7, and the other end fixed to a loop 3. a detection lever 8 placed on the lower end 3a of the , a starting cam 10 and a stopping cam 11 fixed to the rotating shaft 6 with screws 9;
It is equipped with a normally open starting limit switch LS1 and a normally closed stopping limit switch LS2 that cam engage with the starting cam 10 and the stopping cam 11, and each of the limit switches LS1 and LS2 is electrically connected to the drive circuit that drives the drive motor. connected.

FIG. 14 is a circuit diagram showing the drive circuit.

This drive circuit 17 includes a relay RL12 and a thermal overcurrent relay THR. The U phase, V phase, and W phase of the drive motor are connected to the R phase of the three-phase power supply through the normally open main contacts 14a, 14b, and 14c of the RL, respectively.
Connected to S phase and T phase. Furthermore, the electromotive force generating sections 12a and 12b of the thermal overcurrent relay THR are connected in series to the main contacts 14a and 14b. R
The electromagnetic coil 15 of the relay RL and the thermal overcurrent relay THR are connected between the terminals Ta and Tb from which the phase and S phase are drawn out.
Normally closed contact 13, normally closed limit switch
LS2 and normally open starting limit switch LS1
are connected in series. Further, the terminal Tb is connected between the limit switches LS1 and LS2 via the auxiliary contact 16 of the relay RL, thereby forming a bypass.

In the loop detection switch 4, the loop 3
When the lower end portion 3a of the sensor moves in either the up or down direction, the detection lever 8 rotates and the rotating shaft 6 rotates accordingly. As the rotating shaft 6 rotates, the starting cam 10 and the stopping cam 11 rotate.

When the lower end 3a of the loop 3 moves upward, when the lower end 3a reaches the upper limit position A, the starting cam 10 turns the starting limit switch (selector switch) to the LS position,
The electromagnetic coil 15 is excited. This closes the main contacts 14a, 14b, 14c and the auxiliary contact 16. The drive motor is activated by closing the main contacts 14a, 14b, and 14c. Further, since the auxiliary contact 16 closes, the excitation state of the electromagnetic coil 15 is maintained, so even if the drive motor is started and the starting limit switch LS1 is turned off, the drive state of the drive motor is maintained. As a result, the lower end 3a of the loop 3 moves from the upper limit position A toward the lower limit position B.

On the other hand, when the lower end 3a of the loop 3 moves downward, the lower end 3a is at the lower limit position B.
When the limit switch LS2 is turned off by the stop cam 11, the electromagnetic coil 15 is demagnetized. This opens the main contacts 14a, 14b, 14c and the auxiliary contact 16, and the drive motor stops. As a result, the lower end 3a of the loop 3 moves upward. Note that when the lower end 3a of the loop 3 moves upward,
Limit switch LS2 is turned on, but since auxiliary contact 16 is open, the drive motor continues to stop.

And by repeating these actions,
The lower end 3a of the loop 3 is at the upper limit position A and the lower limit position B
move between.

[Problem to be solved by the invention] In the configuration of the loop detection switch 4, when the rotational position of the starting cam 10 with respect to the rotating shaft 9 is set to correspond to the upper limit position A, the rotational position corresponding to the upper limit position is detected. The lever 8 is fixed in position, and thereby the rotating shaft 6 is fixed in position. Next, the screw 9 is loosened, and the starting cam 10 is rotated in one direction with respect to the rotating shaft 6. Then, the starting cam 10 is fixed with the screw 9 at a position where the normally open starting limit switch LS1 is closed. Similarly, the position of the stopping cam 11 is set. These setting operations are performed using a tester while energizing the limit switches LS1 and LS2, and require a great deal of effort. This time-consuming work has to be done for each of the starting cam 10 and the stopping cam 11, and therefore there is a problem in that the setting work takes a long time.

Therefore, if you want to complete the configuration work in a short time,
The operating timing of limit switches LS1 and LS2 becomes inconsistent, and the operating interval becomes shorter or longer. If the operating interval becomes short, the drive motor will start and stop repeatedly within a short period of time, which may cause burnout of the motor. On the other hand, if the operating interval becomes longer, the loop 3 may disappear and excessive tension will be applied to the coil material 2, or the loop 3 may become too large and the coil material 2 may rub against the floor surface.

This invention was made with attention to the above-mentioned problems, and its purpose is to provide a loop detection switch that can easily set the start and stop positions of the drive motor. .

[Means for Solving the Problems] The configuration of this invention that achieves the above object includes a rotating shaft rotatably housed in a case, a detection lever having one end fixed to the rotating shaft, and a detection lever each fixed to the rotating shaft. A starting member and a stopping member are rotatably fixed by a means, and a switching member is rotatably provided in a case and opens and closes a changeover switch by rotation, and a switching member is provided between the starting member and the switching member. When the rotating shaft rotates in one direction and reaches a predetermined rotational position, the starting member and the switching member engage with each other and rotate together, and when the rotating shaft rotates in the other direction, the switching member A first engaging part is provided that allows relative rotation of the starting member with respect to the member, and when the rotating shaft rotates in the other direction and reaches a predetermined rotational position, between the stopping member and the switching member, A second engaging portion is provided that engages with each other to cause the stop member and the switching member to rotate together, and allows the stop member to rotate relative to the switching member when the rotating shaft rotates in one direction. This is the summary.

[Operation] To set the changeover switch to open and close at the upper limit position and the lower limit position of the lower end of the loop, first, rotate the changeover member to position the changeover switch at a position where the changeover operation is to be performed.

Next, the detection lever is fixed at a rotational position corresponding to the upper limit position of the lower end of the loop, thereby fixing the rotational shaft in position. The starting member is rotated in one direction with respect to the fixed rotating shaft. Then, when the engaging portions between the starting member and the switching member engage with each other, the starting member is fixed to the rotating shaft at that position.

Further, the detection lever is fixed at a rotational position corresponding to the lower limit position of the lower end of the loop, thereby fixing the rotational shaft in position. Next, the stop member is rotated in the other direction with respect to the rotation axis. Then, when the second engaging portions between the stop member and the switching member engage with each other, the stop member is fixed to the rotating shaft at that position.

[Example] Hereinafter, an example of this invention will be described based on the drawings.

FIG. 1 is a perspective view showing essential parts of a loop detection switch according to an embodiment, and FIG. 2 is a sectional view taken along the line -- in FIG.

The loop detection switch 21 includes a case 24 consisting of a container-shaped case body 22 with one side open and a side cover 23 that seals the opening of the case body 22. 22
A rotating shaft 2 extending in the horizontal direction by the other side wall part.
5 is rotatably supported. This rotating shaft 25
One end protrudes from the side lid 23, and one end of a detection lever 27 is fixed to the protruding end via a holder 26. In addition, the detection lever 27
A contact 27a (see FIG. 6) is provided at the other end, and when this contact 27a is placed on the lower end 3a of the loop 3, the detection lever 2
7 is adapted to move up and down together with the lower end 3a of the loop 3.

The rotating shaft 25 located inside the case body 22 has a
A sleeve 28 is provided and is prevented from rotating by a key 29 and from moving in the axial direction by retaining rings 30, 30. sleeve 28
A flange 28a is formed on the outer periphery of the central portion of the sleeve 28, and a starting member 31 and a stopping member 32, which face each other with the flange 28a in between, are rotatably provided on the outer periphery of the sleeve 28. The starting member 31 and the stopping member 32 each include a spring seat 3.
It is pressed against the flange 28a by coil springs (fixing members) 35, 36 installed between the sleeve 28a and the sleeve 28a, and is fixed to the sleeve 28 by the frictional force between the sleeve 28a and the flange 28a.

Further, a boss 23a is formed on the inner surface of the side lid 23, and the central part is penetrated by the rotating shaft 25.The outer periphery of the boss 23a has a disk shape centered on the center of the rotating shaft 25. A switching member 37 is provided. An annular space 38 is formed between the switching member 37 and the boss 23a, and this space 38 is filled with grease, and an O-ring 39 for braking the rotation of the switching member 37 is attached. ing.

Further, on the outer periphery of the switching member 37, an arcuate large diameter portion 37a centered on the center of the rotating shaft 25 is provided.
and a small diameter portion 37b are formed, respectively, and an inclined surface 37c is formed at the boundary between the large diameter portion 37a and the small diameter portion 37b. Then, the switching member 37 rotates in the direction of arrow A in FIG.
When the contact 40 of the normally closed limit switch (changeover switch) LS is pressed against the end of the large diameter portion 37a of 7c, the limit switch LS opens, and from this state the switching member 37 rotates in the direction of arrow B to close the limit switch. LS contactor 40 is on inclined surface 37c
When the limit switch LS is relatively moved toward the small diameter portion 36b, the limit switch LS closes.

Further, in order to cause the switching member 37 to open and close the limit switch LS, the switching member 37
7 and the starting member 31 and between the switching member 37 and the stopping member 32, first and second engaging portions are provided, respectively. That is, the switching member 37
In the center of the large diameter portion 37a, there is an actuation pin 41 extending parallel to the rotating shaft 25 toward the starting member 32.
is provided. On the other hand, a protrusion 31a is formed on the outer periphery of the starting member 31.
1 rotates in the direction of arrow A and the protruding portion 31a abuts against the actuating pin 41, the switching member 37 rotates in the same direction together with the starting member 31. Similarly, the outer periphery of the stop member 32 has a protrusion 3
2a is formed, and when the stop member 32 rotates in the direction of arrow B and the protrusion 32a abuts against the actuating pin 41, the switching member 37 rotates together with the stop member 32 in the same direction.

The limit switch LS is electrically connected to a drive circuit that drives a drive motor of the rewinding device 1.

FIG. 3 is a circuit diagram showing the drive circuit.

This drive circuit 42 includes a relay RL and a thermal overcurrent relay THR, as in the conventional circuit described above, and the normally open main contacts 14a, 14 of the relay RL.
U phase, V phase, W of the drive motor via b, 14c
The phases are connected to the R phase, S phase, and T phase of a three-phase power supply, respectively. Terminal Ta from which the R phase and S phase are drawn out
The electromagnetic coil 15 of the relay RL, the normally open contact 13 of the thermal overcurrent relay THR, and the normally closed limit switch LS are connected in series between Tb and Tb.

Next, a method of setting the start position and stop position of the drive motor in the loop detection switch 21 will be explained with reference to FIGS. 4 and 5.

FIG. 4 is an explanatory diagram showing how the starting position of the drive motor is set, and FIG. 5 is an explanatory diagram showing how the stopping position of the drive motor is set.

When setting the starting position of the drive motor, as shown in FIG.
Position it so that the LS can be switched between open and closed. In this case, a protrusion K is formed on the inner wall of the case body 22, and the operating pin 41 is attached to this protrusion K.
If the limit switch LS is arranged so that the limit switch LS performs the switching operation when the two are opposed to each other, the switching member 37 can be easily aligned.

Next, the detection lever 27 is fixed at a starting position of the drive motor, that is, a rotational position corresponding to the upper limit position A of the lower end portion 3a of the loop 3, thereby fixing the rotating shaft 25 in position. After that, the starting member 31
The flange 28 resists the biasing force of the coil spring 35.
Move it away from a and make it rotatable. The starting member 31, which is now rotatable, is rotated in the direction of arrow A in FIG. In this state, the starting member 31 is abutted against the flange 28a by the urging force of the coil spring 35, and the starting member 31 is fixed to the sleeve 28 by the frictional force, and fixed to the rotating shaft 25 via the sleeve 28. .

On the other hand, when setting the stop position of the drive motor, the switching member 37 is held at the above position as shown in FIG. Then, the stop position of the drive motor, that is, the lower end 3 of the loop 3
The detection lever 27 is fixed at a rotational position corresponding to the lower limit position B of a. Moreover, the rotating shaft 25 is fixed in position by this. Next, the stop member 32 is moved away from the flange 28a against the biasing force of the coil spring 36, thereby making it rotatable. Thereafter, the stop member 32 is rotated in the direction of the arrow B so that the protrusion 32
a butt against the actuation pin 41 of the switching member 37.
In this state, the stop member 32 is abutted against the flange 28a by the urging force of the coil spring 36, and the stop member 32 is fixed to the rotating shaft 25 via the sleeve 28 by the frictional force.

Next, the operation of the loop detection switch 21 will be explained with reference to FIGS. 6 to 10.

FIG. 6 shows that the detection lever 27 is located at the lower end 3 of the loop 3.
FIGS. 7, 8, 9, and 10 are explanatory diagrams showing the states when rotating according to the position of the loop 3, respectively, when the lower end 3a of the loop 3 is located at the upper limit position A, the center position FIG. 4 is an explanatory diagram showing the main parts of the detection switch 21 when it is located at position B, when it is located at a position near the lower limit, and when it is located at a lower limit position D.

When the loop detection switch 21 is disposed in the rewinding device 1 to repeatedly control starting and stopping of the drive motor, for example, if the rewinding device 1 is started when the lower end 3a of the loop 3 is located at the center position B. As shown in FIG. 8, the switching member 37 holds the limit switch LS in the closed state.
Therefore, the drive motor is activated and the lower end 3a of the loop 3 moves toward the lower limit position D. Along with this, the rotating shaft 25 rotates in the direction of arrow B, the protrusion 31a of the starting member 31 rotates away from the operating pin 41 of the switching member 37, and the protrusion 32a of the stop member 32 rotates. Actuation pin 41
Rotate so that it approaches. At this time, since the switching member 37 is rotatable relative to the rotating shaft 25, the starting member 31, and the stopping member 32,
Maintain the stopped state and keep the limit switch LS closed. When the lower end 3a of the loop 3 reaches the lower limit position C, as shown in FIG. Rotate. Then, limit switch LS
switches from the closed state to the open state, and the drive motor stops. At this time, the lower end 3a of the loop 3 is located at the lower limit position D.

Further, when the drive motor stops, the lower end 3a of the loop 3 moves from the lower limit position D toward the upper limit position A. As a result, as shown in Figure 10,
The rotating shaft 25 rotates in the direction of arrow A, and the starting member 31
The protrusion 31a of the stop member 32 rotates so as to approach the actuating pin 41, and the protrusion 32a of the stop member 32
rotates away from the actuating pin 41. Immediately before the lower end 3a of the loop 3 reaches the upper limit position A, the protrusion 31a of the starter member 31 abuts against the operating pin 41, causing the switching member 37 to rotate slightly in the direction of arrow A. This sets the limit switch.
LS is switched from open state to closed state.

By opening and closing the limit switch LS in this manner, the lower end 3a of the loop 3 reciprocates between the upper limit position A and the lower limit position D.

Note that this invention is not limited to the above embodiments,
Various embodiments are possible. For example, in this embodiment, a loop detection switch applied to a rewinding device has been described, but the present invention is not limited to this, and the loop detection switch may be applied to a winding device. Alternatively, the loop detection switch may be provided on the press feeding device side and the detection lever may be provided extending in the opposite direction. Furthermore, screw members such as screws may be used as means for fixing the starting cam and the stopping cam. In addition, an operating pin is provided on the starting cam and the stopping cam,
The holding function cam can also be provided with a projection that engages with this.

[Effects of the invention] As explained above, according to this invention, the number of changeover switches is reduced to one, so the setting work becomes easier and can be done in a shorter time. In other words, since the setting work can be done in a short time, the work can be done carefully, and therefore the starting position and stopping position of the drive motor can be set accurately. As a result,
It is possible to prevent the motor from burning out, and it is also possible to prevent excessive tension from being applied to the coil material or the coil material from rubbing against the floor surface. Moreover, even when setting or changing the starting position or stopping position of the drive motor, the setting work is only to engage the starting member or stopping member with the switching member, which further improves work efficiency. Effects such as being able to do the following can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the main parts of the loop detection switch according to the embodiment, Fig. 2 is a sectional view taken along the line - - in Fig. 1, Fig. 3 is a circuit diagram showing the drive circuit, and Fig. 4 is a diagram of the drive motor. An explanatory diagram showing how the starting position is set, Fig. 5 is an explanatory diagram showing how the stop position of the drive motor is set, and Fig. 6 shows the state when the detection lever rotates according to the position of the lower end of the loop. The explanatory diagrams, FIG. 7, FIG. 8, FIG. 9, and FIG. 10 show when the lower end of the loop is located at the upper limit position A, when it is located at the center position B, and when it is located at the lower limit position C, respectively. An explanatory diagram showing the state when located at the lower limit position D, FIG. 11 is a front view showing a conventional loop detection switch arranged in a rewinding device, and FIG. 12 is a perspective view showing the external configuration of the conventional loop detection switch. 13 is a perspective view showing the internal structure of a conventional loop detection switch, and FIG. 14 is a circuit diagram showing a conventional drive circuit. 21... Loop detection switch, 24... Case, 25... Rotating shaft, 27... Detection lever, 31
...Starting member, 31a...Protrusion, 32...Stopping member, 32a...Protrusion, 35, 36...Coil spring (fixing member), 37...Switching member, 41...
Operating pin, LS...Limit switch.

Claims (1)

[Scope of Claim for Utility Model Registration] A rotating shaft rotatably housed in a case, a detection lever having one end fixed to the rotating shaft, and a detection lever rotatably provided on each of the rotating shafts and each fixed by a fixing means. A starting member and a stopping member are fixed to a rotating shaft, and a switching member is rotatably provided in a case and opens and closes a changeover switch by rotation, and the rotating shaft is connected between the starting member and the switching member. When the rotating shaft rotates in one direction and reaches a predetermined rotational position, the starting member and the switching member engage with each other to rotate together, and when the rotating shaft rotates in the other direction, the starting member and the switching member rotate together. A first engaging portion is provided between the stop member and the switching member that allow the rotation shaft to rotate in the other direction and reach a predetermined rotational position. A loop characterized in that the stop member and the switching member are rotated together by the rotation shaft, and a second engaging portion is provided that allows relative rotation of the stop member with respect to the switching member when the rotating shaft rotates in one direction. Detection switch.