JPH0348821Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a setting mechanism for a limit switch that is attached to a valve opening/closing device or the like to control the rotation speed of the rotating shaft of the device.

(Prior art) Conventionally, limit switches that are attached to valve opening/closing devices and the like to control the rotational speed of the rotating shaft of the device have been used to operate micro switches or cam switches using the output shaft of a mechanical counter with multiple intermittent gears stacked on top of each other. Ta. On the other hand, although it does not have the setting mechanism of the present application, the limit switch mechanism whose operation mechanism is basically the same as that of the present application has been filed by the applicant of the present application (Utility Application No. 162049, 1982), and the limit switch mechanism is basically the same as that of the present application. The setting mechanism, which is tightened and attached to the rotating part of the mechanism, requires two operations: tightening with a fastening tool such as a bolt/nut, and adjustment with a knob.

(Problems to be solved by the invention) However, the mechanical counter type has a large number of parts and requires a strong, high-precision intermittent gear, which leads to high costs. When a limit switch with a high allowable rotational speed is required, the number of rotations of the setting shaft for setting work is required to be increased in proportion to the allowable rotational speed, and the setting takes time.

On the other hand, even with the same switch operation mechanism as the one in this application, the setting work requires extra work such as loosening and tightening bolts and nuts, and since it is installed efficiently in a narrow space, the stopping position of the rotating plate cannot be adjusted. In some cases, the fastening tool cannot be set, and there are also problems in that bolts and nuts loosen due to vibration during long-term use, resulting in malfunction.

Another problem was that the range of allowable rotational speed of the input shaft could not be greatly increased.

(Means for Solving the Problems) The present invention was devised to solve the problems of the conventional art, and its purpose is to have a simple structure and to be able to set all mechanical parts with one knob. , a limit switch that anyone can easily adjust in a short time, and also allows the input shaft's allowable rotation speed range to be easily and significantly increased, and even in that case, the setting operation is exactly the same. The purpose of this invention is to provide a setting mechanism, and as a technical means for that purpose, the present invention uses a first upper rotary plate connected to a gear that rotates by greatly reducing the rotation of the input shaft.
The lower rotary plate is rotatably and slidably attached to the shaft, and has a circumferential ridge having a shaped groove formed on the upper surface of the upper rotary plate, and is connected to a gear that rotates by slightly reducing the rotation. It is fixed to the lower end of the first shaft, a protrusion is formed on the upper surface of the lower rotary plate, and a spring is inserted between the upper rotary plate and the lower rotary plate of the first shaft to bias the rotary plates up and down. At the same time, the first shaft is rotatably and slidably attached to the frame, and a knob is rotatably and slidably attached to the tip of the first shaft,
Moreover, a horizontal protrusion is provided at the tip of the first shaft, and a vertical groove with an open top that corresponds to the horizontal protrusion is formed in the knob. A stopper is provided at the tip of the frame to lock the knob, a second shaft is fixed to the frame, an arm is slidably supported on the second shaft, and a lever is rotated on the second shaft. The arm is movably and slidably supported, and the arm is extended to the upper rotary plate so that the circumferential flange slides, and the lever is extended to the lower rotary plate, and a lever is attached to the lower rotary plate at the tip of the lever. An engagement groove is formed that engages with the formed protrusion to rotate the lever, and the rear end of the lever is brought into contact with a limit switch, and the lever is locked by a sliding pawl extending downward from the arm. When the arm is pushed up by the circumferential protrusion, the lever is positioned above the protrusion on the lower rotary plate, and when the arm falls into the [shaped groove], the lever is positioned above the protrusion. On the other hand, a plate-shaped protrusion having a horizontal side is vertically provided at the rear end of the knob, and a horizontal groove corresponding to the horizontal side is formed on the upper part of the boss of the upper rotary plate, and further the upper rotary plate The lower part of the boss is appropriately extended to form a small protrusion on the lower end of the boss and the upper surface of the boss of the lower rotary plate, and the knob is pushed down to rotate the upper rotary plate, and the knob is pulled up to rotate the lower rotary plate. The configuration is such that the limit switch activation timing can be set by

(Function) Therefore, in the present invention, the upper rotary plate 3 connected to the gear 30 that has been greatly reduced rotates slowly, and during this rotation, the arm 23 moves into the shape groove 5 of the upper rotary plate 3.
When the arm 23 falls down, the lever 25, which was hooked to the same arm 23, also descends.

Since the lower rotating plate 6 connected to the gear 31 that has been slightly reduced in speed is rapidly rotating, the protrusion 7 on the lower rotating plate 6 immediately matches the engagement groove 27 of the lever 25 to rotate the lever 25. Activate the limit switch 29 at the rear end of the lever.

The set rotation speed N of the input shaft 32 that operates this limit switch 29 is the rotation speed No. of the upper rotary plate 3.
] The position of the protrusion 7 is determined by the position of the groove 5 and the rotation speed n of the lower rotary plate 6.

When adjusting the upper rotary plate 3, use the knob 13.
When pressed down, it slides along the first shaft 2 against the spring 18, and the plate-shaped protrusion 19 comes into contact with the upper end of the boss of the upper rotary plate, but when pushed down further, it slides for each upper rotary plate 3, and the upper Rotating plate is gear 30
Finally, the lower end of the boss of the upper rotary plate 6 and the small projections 11 on the upper surface of the boss of the lower rotary plate 6 fit into each other. At this time, the knob 13 has come off the horizontal protrusion 15 at the tip of the first shaft 2, and is in a state of unrestricted speed with respect to the first shaft 2.

Therefore, when the knob 13 is rotated in this state, since the lower rotary plate 6 is meshed with the gear 31, the upper rotary plate 3 cannot also be rotated, and only the knob 13 rotates idly. When the plate-shaped protrusion 19 fits into the horizontal groove 10 on the upper part of the boss, the upper rotary plate 3 is slightly raised by the spring 18, and the lower rotary plate 6
There is no contact with the small protrusion 11, and it becomes freely rotatable.

Therefore, from this point on, the upper rotary plate 3 can also rotate with the rotation of the knob 13. If this is continued to be pressed and rotated, the tip 20 of the plate-shaped protrusion 19 formed at the rear end of the knob 13 will fall into the stop hole 21 of the upper plate 8, and the rotation will be stopped. At this time, the shape groove 5 is located below the arm 23, and the starting point of the upper rotary plate 3 is determined. When the knob 13 is released, the upper rotary plate 3 is raised by the spring 12 and meshes again with the gear 30 which has been greatly reduced, and the setting of the upper rotary plate 3 is completed.

Next, when the knob 13 is pulled up, the first shaft 2 is stopped by the stopper 17 and pulled up at the same time. Since the lower rotary plate 6 is fixed to the lower end of the first shaft 2, it is disengaged from the gear 31 and becomes rotatable. Also, since the first shaft 2 has a horizontal protrusion 15 that is engaged with the vertical groove 16 of the knob, the first shaft 2 can rotate the knob 13 together, so the lower rotary plate 6 can be rotated by the required amount to set it. . When the knob 13 is released, the lower rotary plate 6 is pushed downward by the spring 6 and engages again with the gear 31 which has been slightly decelerated, thereby completing the setting of the lower rotary plate 3 and the operation setting of the limit switch 29.

When this mechanism operates the limit switch 29, first the gear 30 which has been greatly reduced is used to operate the upper rotary plate 3.
By the rotation of the arm 23, the arm 23 falls into the shaped groove 5, and the lever 25 is slid downward to the vicinity of the lower rotary plate 6. Furthermore, since the lower rotary plate 6 is also rotating at a high speed at this time, it immediately engages with the protrusion 7 to rotate the lever 25, and the rear end of the lever 25 operates the limit switch 29.

(Example) Examples of the present invention will be described below based on the drawings.

In the figure, 1 is a limit switch setting mechanism, 2
is the first shaft, 3 is the upper rotating plate, 4 is the circumferential protruding edge protruding from the upper surface of the upper rotating plate 3, and 5 is formed by cutting out a part of the upper surface of the circumferential protruding edge. The groove, 6 is a lower rotating plate, and 7 is a projection disposed on the upper surface of the lower rotating plate 6. Further, 8 is an upper plate as a frame, 9 is a lower plate, and the first shaft 2 is supported by the upper plate 8 and the lower plate 9 so as to be slidable and rotatable. Further, the lower rotary plate 6 is fixed to the lower end of the first shaft 2, and the upper rotary plate 3 is attached to the first shaft 2 so as to be slidable and rotatable.

Furthermore, the upper boss of the upper rotating plate 3 is extended above the upper plate 8 to form a horizontal groove 10 at the tip of the boss, and the lower boss is appropriately extended downward to form a connection between the boss tip and the lower rotating plate 6. A small protrusion 11 is formed at a position corresponding to the upper surface. The upper rotating plate 3 is urged upward by a spring 12.

Further, 13 is a knob, and a long boss 14 is slidably and rotatably inserted into the tip of the first shaft 2, and a horizontal protrusion 15 is provided at the tip of the first shaft 2, which is attached to the tip of the knob 13. It is engaged in a vertical groove 16 formed in a part of the boss 14 and having an open upper part.

In addition, 17 is a stopper as a stopper, 18 is a spring, 19 is a plate-shaped projection formed at the rear end of the knob 13, 20 is a tip of the same plate-shaped projection 19, and 21
is a stop hole corresponding to the tip 20 of the plate-like projection 19 bored in the upper surface of the upper plate 8.

Further, 22 is a second shaft, 23 is an arm, 24 is a cylinder for supporting the arm 23, 25 is a lever, and 26 is a sliding claw extending from the cylinder 24, and inserted into a groove provided in the boss of the lever 25. The lever 25 is rotatably held in the cylindrical body by being fitted into the cylinder. Further, 27 is an engagement groove for the protrusion 7 provided at the tip of the lever 25, 28 is a spring, and 2
9 is a limit switch. In addition, 30 is a gear with a large reduction, 31 is a gear with a small reduction, 32 is an input shaft, and 33 is a rotating shaft of the valve.

Although the embodiment of the present invention has been described above with reference to the drawings, the specific configuration of the present invention is not limited to this embodiment, and the present invention may be modified without departing from the gist of the invention. within the technical range of

For example, by making the upper rotary plate two-stage, the allowable rotation speed of the input shaft is 16 times (64 to 1024) that of the basic type (4 to 64 rotations).
rotation), etc. can be easily done.

(Effects of the invention) As described above, according to the present invention, by having the configuration with the above features, it is possible to operate accurately for a long period of time without being affected by adverse conditions despite the simple structure and few precision parts. It can be a limit setting mechanism.

In addition, the number of parts is small, it is easy to manufacture, and the cost is low. Furthermore, anyone can handle it reliably and easily, and it can be set up in a short time.

Furthermore, the allowable rotation speed of the input shaft can be greatly increased, and can be set using the same operating method.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an embodiment of the limit switch setting mechanism of the present invention, Fig. 2 is a perspective view showing the main parts, Fig. 3 is an explanatory diagram showing the order of adjusting the upper rotary plate, and Fig. 4 is an explanatory diagram showing an embodiment of the limit switch setting mechanism of the present invention. FIG. 5 is an explanatory diagram showing the adjustment of the lower rotary plate, and FIG. 5 is an explanatory diagram showing another embodiment. 1: Limit switch setting mechanism, 2: First axis,
3: Upper rotating plate, 4: Circumferential protruding edge, 5: Shape groove, 6: Lower rotating plate, 7: Protrusion, 8: Upper plate (frame), 9: Lower plate (frame), 1
0: horizontal groove, 11: uneven surface, 12: spring,
13: Knob, 15: Horizontal protrusion, 16: Vertical groove, 1
7: Tomewa (stopper), 18: Spring,
19: plate-like projection, 22: second axis, 23: arm,
25: lever, 26: sliding pawl, 29: limit switch, 30: gear with large reduction, 31: gear with small reduction, 32: input shaft.

Claims (1)

[Scope of utility model registration request] An upper rotary plate connected to a gear that rotates by greatly reducing the rotation of the input shaft is rotatably and slidably attached to the first shaft, and a circumferential ridge having a shaped groove is provided on the upper surface of the upper rotary plate. A lower rotary plate connected to a gear that rotates with a small speed reduction is fixed to the lower end of the first shaft, a protrusion is formed on the upper surface of the lower rotary plate, and a protrusion is formed on the upper surface of the first shaft. A spring is inserted between the upper rotary plate and the lower rotary plate to bias the rotary plates up and down, and the first shaft is rotatably and slidably attached to the frame, and a knob is attached to the tip of the first shaft so that the rotary plate can be rotated or slidably moved. In addition, a horizontal protrusion is provided at the tip of the first shaft, and a vertical groove with an open top that corresponds to the horizontal protrusion is formed in the knob, and the knob is fitted with a spring. While urging the first shaft upwardly, a stopper is provided at the tip of the first shaft to lock the knob, a second shaft is fixed to the frame, and an arm is slidably supported on the second shaft, Further, a lever is rotatably and slidably supported on the second shaft, an arm is extended to the upper rotary plate to slide the circumferential flange, and the lever is extended to the lower rotary plate. , an engagement groove is formed at the tip of the lever to engage with a protrusion formed on the lower rotary plate to rotate the lever, and the rear end of the lever is brought into contact with a limit switch, and further extended downward from the arm. The lever is locked with a sliding claw and held integrally with the arm, and when the arm is pushed up by the circumferential protrusion, the lever is positioned above the protrusion of the lower rotary plate, and the arm is shaped like When it falls into the groove, the lever is lowered to the position of the protrusion, and on the other hand, a plate-shaped protrusion having a horizontal side is vertically provided at the rear end of the knob, and the upper part of the boss of the upper rotary plate is aligned with the horizontal side. A horizontal groove is formed, and the lower part of the boss of the upper rotary plate is appropriately extended to form a small protrusion on the lower end of the boss and the upper surface of the boss of the lower rotary plate, and the knob is pushed down to rotate the upper rotary plate. A limit switch setting mechanism characterized in that the limit switch operation timing is set by pulling up a knob and rotating a lower rotary plate.