JPS587210B2 - Limit switch for doors - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a limit switch for a door, such as a shutter that opens and closes vertically, and provides a limit switch in which upper and lower limits can be set extremely easily and the circuit can be controlled reliably. It is something.

To summarize the present invention, the rotation of the human power shaft is slowed down through a gear train, and then a cam plate is rotated, and the control is performed using a notch provided in the cam plate.When setting the upper and lower limits, the rotation speed is reduced by rapid traverse. This allows it to be set to .

Examples of door limit switches will be described below with reference to the drawings.

1 is the case body of the limit switch.

2 is an input shaft supported by bearings 3 and 4, and a small gear 5 is attached to this.
is provided.

The lower end of the input shaft 2 is configured such that power can be taken in from one end via a clutch and taken out from the other end.

That is, the rotation of the winding shaft of the shutter is transmitted to the input shaft 2 of the present invention via the chain and sprocket.

Reference numeral 6 denotes a reduction gear that meshes with the small gear 5, and is integrally attached to the first reduction shaft 7 together with the small gear 9 provided below, and rotates at the same time.

Note that collars 8 and 10 are thrust receivers.

Reference numeral 11 denotes a reduction gear that meshes with the small gear 9, which is integrated with the small gear 12 and fixed to the second reduction shaft 13.

15 is a cam feed gear, which meshes with the small gear 12.

16 is an upper cam plate, 17 is a lower cam plate, and these are loosely fitted coaxially to the upper part of the cam shaft pin 18. A torque limiter sleeve 20 is screwed concentrically onto the outside of a clutch-equipped camshaft 20a having a clutch 19 at its lower end.
It is rotatably attached to.

21 is a collar, and 22, 23, 24, and 25 are torque spacers, which are fitted to the torque limit sleeve 20 so that they cannot rotate relative to each other.

Reference numeral 26 denotes a torque limiter plate spring constituting a torque limiter, which is attached in pressure contact between the torque spacers and is configured to be able to transmit up to a predetermined synchronous torque.

The cam feed gear 15 and the lower cam plates 17 and 16 are connected to the torque limit sleeve 20 via the torque spacer or the torque limiter leaf spring.
When the clutch-equipped camshaft 20a is screwed into the screw hole of the torque limit sleeve 20 and properly tightened, the clutch-equipped camshaft 20a rotates as one unit within a predetermined rotational torque range.

On the other hand, if the cam plate or the like is restrained, the torque limiter plate spring will slip, and only the torque limiter sleeve will rotate idly.

Reference numeral 30a denotes a rapid feed idle gear, which is a fast feed gear 3 with a clutch that is loosely fitted to the reduction gear 6 and the camshaft pin 18.
0 and is rotatably attached to the fixed shaft 29.

28 is a thrust receiver for a rapid feed idle gear.

Also, this idle gear 30a is a fast forward gear 30 with a clutch.
This is provided to make the rotating direction of the gear 15 and the gear 15 the same.

The fast feed gear 30 with a clutch is rotatably attached to the camshaft pin 18, and the fast feed gear 30 is connected to the camshaft with a clutch through the cam 19 of the camshaft 20a with an integrated clutch 19' at the top. Rotation can be transmitted to the rib 20.

The clutches 19 and 19' are normally separated by a spring and are in a non-engaged state.

When the clutches 19 and 19' are engaged by a set lever 37, which will be described later, the rotation of the fast-forwarding gear 30 is transmitted via the clutch-equipped camshaft 20a to the hydraulic sleeve 20 that is screwed thereto.

Therefore, the cam plates 16, 17, etc. are also rotated via the rotation limiter.

However, when the cam plate 17 is restrained, the torque limiter slides against the torque limit sleeve 20, and only the upper cam plate 16 rotates.

Conversely, if the upper cam plate 16 is restrained, the torque limiter will slide against the torque limiting sleeve 20, and only the lower cam plate 1T will rotate.

Furthermore, when both cam plates 16, 17 are restrained, only the torque remix sleeve 20 rotates, and both cam plates 16, 17 do not rotate relative to the torque remix sleeve 20.

Therefore, if no cam plate is restrained, the camshaft with clutch 20a, the torque remix sleeve 20, the cam plate 16.
17 will rotate as one.

Further, when the clutches 19, 19' are engaged, the cam feed gear 15 receives rotational action from both the pinion gear 12 and the rapid feed gear 30.

However, the rotation transmitted from the small gear 12 and the rapid feed gear 3
Although the rotation is in the same direction as the rotation due to 0, the number of rotations is different.

This difference in rotational speed is absorbed by slippage between the cam feed gear 15 and the lux spacer 22 fitted into the torque remix sleeve 20.

The cam plate 16 has abutment pieces 32, 33 on the top and bottom of its periphery (FIG. 3), and also has notches 34 on its circumference.

The cam plate 17 is also provided with a contact piece 35 on its peripheral edge and a notch 36 on its circumference (FIG. 4).

In this case, the angle β between the notch 34 and the contact piece 32 (Fig. 3)
and the angle α (FIG. 4) formed by the notch 36 and the contact piece 35 are not equal.

37 is a set lever, and when this is pushed downward along the vertical groove provided in the set lever body 38, the set lever body 3
8, the clutch actuating piece 40 (see FIG. 6) is lowered against the spring 39 and pushes one end of the clutch actuating piece 40 (see FIG. 6), and the other end is sprung up to engage the clutch 19, 19'.

When the set lever 37 is operated along a hook-shaped guide groove provided in the case as shown in FIG. 6, it rotates around the shaft 41 and in the direction of arrow A or B in FIG. 1.

Then, claws 42 and 43 integrally provided on the upper part of the set lever main body 38 engage with the contact pieces of the cam plate 16 and 17 to restrain the cam plate.

That is, the claw 42 is connected to the contact piece 33 on the upper surface of the upper cam plate 16.
The pawl 43 is wide in the vertical direction and engages with the upper and lower cam plates 1.
It can be engaged with the contact piece 32.35 of 6.17.

Reference numeral 44 denotes a microswitch actuating member attached to the set lever main body 38, so that when the set lever 37 is rotated in either direction A or B, the sub microswitches 45 and 45' are actuated.

46 is a main microswitch whose actuator 47 engages with the notch 34 of the cam plate 16 to interrupt the circuit.

Similarly, the actuator 49 of the main microswitch 48 is connected to the cam plate 1.
It is configured to be shut off when it engages with the notch 36 of No.7.

With the above configuration, the upper and lower limits can be adjusted as follows.

(a) When the set lever 37 is pushed and turned to the A position, the pawl 43 of the set lever main body 38 is in a position where it engages with the contact pieces 32 and 35.

At the same time, the actuating piece 44 keeps the auxiliary microswitch 45' energized, and the fast-forwarding gear 30 turns the clutch actuating piece 40 (
(Fig. 7) is pushed upward (in the x direction in Fig. 2),
The torque remix sleeve 20 and the rapid feed gear 30 are connected by a clutch 19, 19' via the clutch-equipped camshaft 20a.

Therefore, the rotation of the input shaft 2 is transmitted through the gears 5 -> 6 -> 30a -> fast feed gear 30, and the torque remix sleeve 20 rotates quickly.

At this time, the rotation from the small gear 12 is transmitted to the cam feed gear 15, but the difference in rotation speed between this rotation and the rotation from the fast feed gear 30 is absorbed by the sliding action of the torque spacer 22.
The cam plates 16,17 rotate in rapid traverse.

(Exposure) When the cam plates 16 and 17 rotate and the contact pieces 32 and 35 hit the pawls 43, the cam plates are restrained and stopped.3 At this point, the microswitch 48 is shut off by the notch 36 of the cam plate 17. is pre-fabricated.

However, since the sub microswitch 45' is energizing, the rotation does not stop.

(c) When the shutter rises to the highest position, press the shutter stop button to stop it.

This stops all rotation and allows the shutter upper limit position to be set.

(d) Next, after returning the set lever 37 to the neutral position,
When the cam plate 16 is turned in the direction B in FIG. 1, the cam plate 16 rotates at a reduced speed along the path of the human power shaft 2 -> the small gear 12 -> the cam feed gear 15.

At this time, the rotation of the fast feed gear 30 is the clutch 19.19'
Since they do not engage, it becomes free and does not affect the rotation of the cam plate.

When the lowering button of the shutter is pressed, the pawl 42 stops at a position where it blocks the abutment piece 33 of the cam plate 16, the sub micro switch 45' is turned off, and the sub micro switch 45 is turned on.

(e) Since the rotation from the input shaft 2 rotates the cam plates 16 and 17 in the direction opposite to the arrow Y in FIG. Slip occurs at the torque spacers 24 and 25 and stops.

That is, the cam plate 16 rotates by an angle of (α-β) and then stops.

At this time, the micro switch 46 is inserted into the notch 34 of the cam plate 16.
becomes OFF.

(f) When the shutter reaches its lowest position, press the stop button on the shutter to stop it, and all rotation will stop, creating a gap γ (FIG. 5) between the notches 34 and 36 of the cam plate 16, 17.

This interval γ becomes the interval to be set.

That is, the interval to be set (in the case of a shutter door, the upper and lower limits) appears smaller in proportion to the deceleration by the gear trains 5, 6, 9, 11, and 12.15.

(g) Next, move the set lever 37 between the three contact pieces 32 and 33.
．． If you return it to the position where it does not hit 35 (neutral position) and fix it,
The displacement γ of the cutout portions of the cam plates 16 and 17 no longer changes.

At the same time, both auxiliary microswitches 45 and 45' are OFF.
Therefore, only when the notch 34 in the microswitch 46 and the notch 36 in the microswitch 48 come, the microswitches 46 and 48 are turned OFF and rotation is stopped.

This means that two setting positions are controlled by the microswitch.

In the above, the displacement γ, that is, the distance between the notches 34 and 36 can be set at any position until the notches 34 and 36 are aligned.

Further, if it is desired to perform a mid-stop stop in conjunction with signals, smoke, and heat sensation, the above control can be performed by adding only the cam plate 16, claws, and microswitches.

Further, the sub-microswitches 45, 45' may be omitted, but in this case, the notches 34, 36 of the cam plate 16, 17 may be set so as to stop just before the microswitches 46, 48 are turned off.

However, there will be some deviation between the set position and the actual stopping position, so it is necessary to take this into consideration and make adjustments.

Furthermore, overrun can be absorbed by making the length of the notch in the cam plate long.

The above is an explanation of setting and adjusting the upper and lower limits of the limit switch by moving the shutter up and down. For example, when the shutter is at the lowest position, the clutch of input shaft 2 can be turned off without moving the shutter. As described above, the position of the limit switch can be set simply by turning the input shaft with your finger.

As described above, according to the present invention, the upper and lower cam plates having notches and contact pieces are mounted on the torque limiting sleeve via the torque limiter, and the reduced rotation is transmitted to the cam feed gear, and the reduced rotation is transmitted from the one piece and the fast feed gear via the clutch. Since the Torque Remix sleeve is rotated by the user, the adjustment time is shortened and the work can be done quickly.

In addition, a set lever main body having a notch and a corresponding micro switch in the cam piece and a contact piece and a corresponding pawl is prepared, and the set lever main body is operated by rotating and vertically moving the set lever. Since the fast-forwarding clutch and the sub-micro switch are operated in response to the operation of the set lever, there is an advantage that the operation can be extremely simplified.

Further, as described above, since clutches are formed above and below the input shaft 2, two or more of the same limit switches can be stacked vertically, power can be transmitted by the clutches, and a large number of contact points can be made.

[Brief explanation of drawings]

FIG. 1 is a plan view of a microswitch according to the present invention. Figure 2 is also a longitudinal sectional view. FIG. 3 shows the cam plate 16. FIG. 4 shows the cam plate 17. FIG. 5 shows the relationship between the notch positions after adjustment. FIG. 6 is a perspective view of the microswitch. Figure 7 is an exploded view of the cam plate mounting part. In the figure: 1... Case body (of the limit switch), 2... Input shaft, 3, 4... Bearing, 5... Small gear, 6...
... Reduction gear, 7 ... First reduction shaft, 8 ... Collar, 9 ...
...Small gear, 10...Thrust, 11...Reduction gear, 1
2... Small gear, 13... Second reduction shaft, 15... Cam feed gear, 16... Cam plate (upper stage), 17... (■ stage)
Cam plate, 18...camshaft, 19.1s...clutch,
20... Torque remix sleeve, 20a... Camshaft with clutch, 21... Collar, 22, 23, 24.25...
...torque spacer, 26...torque limiter plate spring,
28... Thrust receiver, 30a... Rapid feed idle gear, 30... Rapid feed gear (with clutch), 31... Coil spring, 32, 33, 35... Hit piece, 34.3
6... Notch, 37... Set lever, 38... Set lever main body, 39... Spring, 40... Clutch operating piece, 4
1...Shaft, 42.43...Claw, 44...Microswitch operating member, 45.45'...Sub-microswitch, 4
6, 48... Main microswitch, 47, 49... Operator.

Claims (1)

[Claims] 1. A door limit switch comprising the following structural requirements (a) to (g). (a) camshaft pin 18 (b) fast-forwarding gear 30 with a clutch, which is loosely fitted concentrically onto the camshaft pin 18, has a clutch pawl 19' on its upper surface, and is driven by a rapid-forwarding gear train; (c) the above-mentioned It is loosely fitted concentrically to the camshaft pin 18, and the clutch pawl 19 is provided on the lower surface.
(a) The torque remix sleeve 20 is screwed into a clutch-equipped camshaft 20a having a clutch pawl 19 that engages with the torque remix sleeve 20. Cam feed gear 15 fitted via a torque spacer (e) Fitted to the torque remix sleeve 20 via a torque spacer, a notch 36 for cutting off the microswitch and a contact piece 35 for restraining the cam plate are provided at the periphery. a lower cam plate 17 (f) connected to the torque limiting sleeve 20 via a torque limiter plate spring and a torque spacer;
The upper cam plate 16 (g) has a notch 34 for shutting off the microswitch on the periphery and contact pieces 32 and 33 for restraining one cam on the upper and lower surfaces.A contact for both the lower and upper cam plates. A set lever main body 38 comprising a pawl 43 that engages with the upper cam plate, a pawl 42 that engages only with the contact piece of the upper cam plate, and a set lever 37 that can operate the clutch actuation piece 40.