JPS60248547A - Screen stop mechanism of screen winder - Google Patents

Abstract

PURPOSE:To keep a motor in a stop state even if a take-up shaft is caused to go over a set stop position by weight inertial of a screen, and it exceeds a set count value by controlling the motor to be turned off by a switch when counter counts the set count value as a screen stop position. CONSTITUTION:Though a screen 13 is weighty so that a self-lock mechanism of a motor is caused to make incomplete operation by its weight inertia to control a motor to be turned off, if a take-up shaft 2 is turned excessively, a count wheel 27 for the lower figure of a counter 17 is moved in the direction to a higher figure step by step by the excessive movement, but a count shaft 29 for the highest figure can never be reached. That is, the count wheel 29 is adapted to keep a limit switch 50 in off-state through a switch operation lever 47 to prevent the motor from being driven again, whereby the motor is reliably controlled and stopped to prevent reckless driving of the screen 13.

Description

Detailed Description of the Invention (a) Field of the Invention This invention relates to a method for winding up or unfolding various screens such as curtains, blinds, lightweight shutters, tents, and projection screens. The present invention relates to an apparatus, and more particularly to a screen stop mechanism that stops the screen at a set screen stop position when the screen is wound up or unfolded by the output of a motor.

(B) Background of the Invention When the winding shaft of the above-mentioned screen winding device is controlled in forward and reverse directions by the forward and reverse output of the motor and automatically stopped at the winding position or the unfolded position, the screen is detected by detecting the moving position of the screen. A screen stop mechanism must be installed to stop and control the drive of the motor using this detector, but conventionally, the screw feed mechanism was formed by a long threaded rod and a pinion that reciprocated along the threaded rod. There was a device that controlled the stop of a motor by operating a switch by moving a pinion (for example, Japanese Patent Publication No. 49-47116).

In the case of this conventional device, since the screw feeding mechanism is long, the device becomes large and cannot be housed inside the winding shaft, and must be installed outside the screen winding device. Further, there were other problems such as low positional accuracy of stop control.

One way to solve the above problem is to count the amount of rotation of the winding shaft using a counter equipped with a plurality of counting wheels that sequentially advance and count the amount of rotation of the winding shaft. It is conceivable to configure the motor to be controlled to stop when the value is reached.

By using the counter in this way, the device can be made compact and the positional accuracy can be improved.

In the case of the above-mentioned counter method, if you set the screen to stop at an arbitrary position, the count value of the counter will not be specified, so in order to specify this, set the screen stop position to the value of ``o o o'' of the counter. However, when stopping the screen, it is necessary to sequentially subtract from the base position and stop the motor when the above-mentioned "o o o" is detected.

However, even if the motor is turned off, if the screen is heavy and the winding shaft rotates extra due to inertia due to the weight of the screen, the counter will be further subtracted by this rotation, and the counter value will change to °' 999 ” or less, exceeding the above-mentioned 'o o o',
The problem is that the motor is turned on again and the screen goes out of control.

(c) Purpose of the Invention This invention prevents the motor from being driven again even if the winding axis exceeds the set stop position due to the weight inertia of the screen and the counter value exceeds the set count value of the stop control. An object of the present invention is to provide a screen stop mechanism for a screen winding device that can reliably control the stop of a motor.

(D) Summary of the Invention This invention provides a counter equipped with a plurality of counting wheels that sequentially carry-add and count the amount of rotation from the winding shaft corresponding to the movement of the screen toward the stop position, and Rotate less than one rotation with respect to the maximum movement of
A switch operation part is formed on the counting wheel that rotates intermittently by carry rotation from the lower digit counting wheel, and when this counter counts the set count value set as the stop position of the screen, the counting wheel with the switch operation part Turn off the motor with the switch operation part
The present invention is characterized in that it is a screen stop mechanism for a screen winding device in which a switch for F control is provided opposite to a counter.

(E) Effects of the Invention According to the present invention, among the counters equipped with a plurality of counting wheels that count the amount of rotation from the winding shaft, the counter that makes a rotation of less than one rotation with respect to the maximum movement amount of the screen is provided. The wheel is the counting wheel for the largest upper digit, and when the counting wheel for the largest upper digit rotates intermittently due to the addition rotation of the carry from the counting wheel for the lower digit, after this counting wheel has counted the set count value, is not rotated unless there is an additional rotation for a carry from the counting wheel of the lower digit.

Therefore, when the counter counts the set count value (e.g. '000') set as the stop position of the screen, the counting position of the counting wheel of the largest upper digit (O'' position of the largest upper digit)
By detecting this and turning off the motor, even if the winding axis exceeds the set stop position due to the weight inertia of the screen, the number on the counter will only be the reciprocal of the lower digit counting wheel (for example, "'001"). ~"099"), and the counting wheel is not advanced to the maximum upper digit, so the switch maintains the state in which the motor is controlled to be OFF, and runaway of the screen is reliably prevented.

(f) Embodiment 1 of the invention □ An embodiment of the invention will be described in detail below based on the drawings.

The drawing shows a screen stop mechanism of a screen winding device, and in FIG. 1, this screen winding device 1 is provided with a cylindrical winding shaft 2 rotatably.
An appropriate screen is wound around the outer peripheral surface of the winding shaft 2, and the screen is wound up or unfolded by rotating the winding shaft 2 in the forward or reverse direction.A bearing is attached to one end of the winding shaft 2. A support shaft 4 is supported via a bearing 7, and the narrow end is supported by a case 6 of a screen stop position setting device 5, which will be described later, via a bearing 7. (not shown), the screen winding device 1 is installed.

A motor 8 which is a drive source for the winding shaft 2 is housed inside the winding shaft 2 on the screen stop position setting device 5 side, and this motor 8 is composed of a forward and reverse motor. A deceleration mechanism 9, such as a d-planetary gear deceleration mechanism, is housed on the side, and the output of the aforementioned motor 8 is decelerated by this deceleration mechanism 9, and the winding shaft 2 is driven by this deceleration output. Ru.

A self-locking mechanism 10 is housed on the other side of the motor 8, and when the motor 8 is stopped, the self-locking mechanism 10 locks the rotation of the motor 8 to prevent the screen from slipping down. .

In addition, 11 is a capacitor storage part, Comprising: When the above-mentioned motor 8 is comprised by a capacitor motor, the capacitor for the operation is accommodated.

The motor 8, deceleration mechanism 9, self-lock mechanism 10, and capacitor housing 11 are mounted on a cylindrical fixed shaft 12, and the inner end of the fixed shaft 12 is connected to a winding shaft via an appropriate bearing. The outer end side is fixed to the above-mentioned screen stop position setting device 5, and the inside thereof is used as a storage area for lead wires that connect the motor 8 and the capacitor to an external power line.

As shown in FIGS. 2 to 4, the screen stop position setting device 5 described above includes an upper limit stop position setting mechanism 14 for setting the upper limit of winding of the screen 13, and a lower limit stop position setting mechanism 15 for setting the lower limit for winding the screen 13. and these mechanisms 14.15
operates in response to the forward rotation and reverse rotation of the motor 8, respectively,
Since their mechanisms have the same configuration, one, mM4, will be explained.

That is, the above-mentioned stop position setting mechanisms 14 and 15 are
The planetary gear differential mechanism 16 includes an internal gear 18 and a plurality of planetary gears 21 that mesh with the internal gear 19 of the gear 18 and are pivotally supported by a carrier 20. And this planetary gear 21
The external gear 23 formed on the outer peripheral surface of the internal gear 18 and the sun gear 22 that meshes with the internal gear 23 formed on the outer peripheral surface of the aforementioned internal gear 18 is formed by the internal gear 2 formed on the inner peripheral surface of the end of the aforementioned winding shaft 2.
4, the rotation of the winding shaft 2 is input.

The sun gear 22 described above is fixed to an adjustment shaft 25 installed on a support frame 32, which will be described later. When the adjustment shaft 25 is in the fixed state, the planetary gear differential mechanism 16 is fixed to the carrier. Output occurs from 20.

The above-mentioned counter 17 has an input wheel 26 composed of gears and three counting wheels 27, 28, 29, and these wheels 26 to 29 are supported in an idling state on the above-mentioned adjustment shaft 25. The input wheel 26 is integrally connected to the carrier 20 of the planetary gear differential 1416 described above.

A swing shaft 30 is provided at a position facing the above-mentioned wheels 26 to 29, and this swing shaft 30 is installed on a swing frame 31. 33 so as to be swingable, and is urged toward the wheels 26 to 29 by a spring 34 wound around the shaft end of the support shaft 33.

An intermediate gear 35 that meshes with the input wheel 26 is supported in an idle rotation state at a position facing the input wheel 26 of the above-mentioned swing shaft 30, and a shift gear 36 is connected to the side surface of the intermediate gear 35. has been done.

On one side of each of the aforementioned counting wheels 27 to 29, each wheel body 27 to 2 is provided.
Gears 37 for rotating the gears 9 are formed in series,
Also, on the other side, there is an upper digit counting wheel 28.29 at one place on the circumference.
A digit feed pawl 38 for intermittently digit feeding is formed, and on the swing shaft 30 facing the position between the adjacent counting wheels 27 to 29, the adjacent gears 37 and digit feeding pawls 38 are formed. A shift gear 36 meshing with the pawl 38 is supported in an idle state.

Each counting wheel 27 to 29 of the counter 17 having the above-described configuration
When each wheel is rotated 10 times, the counting wheel of the upper digit of the next stage is changed to 1.
The number of gears is set so that it rotates, and the counting wheel 27 of the lowest lower digit rotates continuously, but the counting wheel 28.2 of the next stage and above
9 is an intermittent rotation due to one rotation of the digit feed claws 38.

Further, the counting wheel 29 of the largest upper digit is set to rotate less than one rotation relative to the maximum movement amount of the screen 13.

Then, the input wheel 26 is connected to the carrier 2 of the front-stage differential mechanism 16.
When rotated at 0, the intermediate gear 35 is rotated, and the shift gear 36 connected thereto meshes with the gear 37 of the counting wheel 27 of the lowest lower digit to rotate this counting wheel 27. When this counting wheel 27 rotates once, the digit feed pawl 38 of this counting wheel 27
By rotating the next-stage shift gear 36 and sequentially transmitting such carry rotation, each of the counting wheels 27 to 29 is sequentially shifted.

As a result, the amount of rotation of the winding shaft 2 on the winding side or the unfolding side is counted by each of the t1 wheels 27 to 29 of the counter 17.

Note that the counting direction of the counter 17, that is, each counting wheel 27
The shift direction of ~29 is a direction that is added to the movement of the screen 13 toward the stop position. For example, in the case of lower limit setting, the shift direction of the screen 13 is added when the screen 13 is moved in the unfolding direction.
In other words, it is carried up, and when the upper limit is set, it is added, that is, carried up, by movement in the winding direction.

Each of the above-mentioned counting wheels 27 to 29 and each of the digit feed gears 36... is formed with a return mechanism that returns the counting state to the set count value set as the upper or lower limit stop position of the screen 13. .

As shown in FIG. 5, the gears 37 of each counting wheel 27 to 29
A heart-shaped cam 39 is formed on the side surface, and a return lever 40 is connected to the swing frame 31 facing the cam 39, and the return lever 40 is operated by swinging the swing frame 31. Then, the cam 39 comes into contact with the above-mentioned cam 39, and the cam 39 is rotated by the contact pressure, and the cam 39 is moved to the regulation position 4.
1, and this regulation position 4
1 is formed with two contact portions that abut on the return lever 40 within a predetermined range, and when the straight portion of the return lever 40 comes into contact with these contact portions, the cam 39 is regulated to a fixed position. and,
By rotating the cam 39 to this home position, the counting state can be returned to the set count value set with the counting wheels 27 to 29 at the stop position.

On the other hand, each of the above-mentioned digit feed gears 36... has a square shaft portion 42.
... are formed on these square shaft portions 42, and when the swing frame 31 is operated to swing, it comes into contact with the flat surface of the square shaft portion 42, and the respective shift gears 36... When the rotating position is set to a constant position, that is, when the swinging operation is released, the digit feed gear 36
... and the gear 37... are arranged opposite each other in a state in which the tips of their teeth mesh without abutting each other, and the return plate 43 is formed of a leaf spring. Its base end is fixed to the support frame 32, and its free end is fixed to the square shaft part 4.
Contact with 2.

Further, an operating arm 44 is connected to the above-mentioned swing frame 31, and when the swing frame 31 is operated to swing, the operating arm 44 operates a switch operation lever 47, which will be described later, to turn on the limit switch 50. Operate and drive control I of the motor 8
I do it.

Furthermore, there is a recess 46 on the circumferential surface of the counting wheel 29 of the largest upper digit.
A switch operation lever 47 is provided opposite to this counting wheel 29, and the above-mentioned counting wheel 29 is connected to the above-mentioned cam 39.
The return lever 40 is operated to return the screen 13.
A protrusion 48 formed at the intermediate portion of the switch operation lever 47 is provided to engage with the above-mentioned recess 46 when the switch is at the set count value set as the stop position.

The base end of the switch operation lever 47 mentioned above is pivotally attached to the support frame 32 with a pin 49, and the free end has a switch for turning off the motor 8.
A limit switch 50 to control is provided oppositely, and a switch operation lever is operated by the push button of the limit switch 50. -47 is a counting wheel 29.
The switch operation lever 47 is biased toward the side.
is provided so that when the projection 48 engages with the recess 46 of the counting wheel 29 and moves, the limit switch 5o is turned off based on this movement.

Further, the above-described switch operation lever 47 is opposed to the operation arm 44 of the above-mentioned swing frame 31, and when this swing frame 31 is swing-operated, the operation arm 44 moves the switch operation lever 47 toward the limit switch 50 side. , and turn on this limit switch 5o.

Adjustment shaft 25.2 passing through each of the aforementioned counters 17.17
Gears 51.51 are fixed to the other end of 5, and fine adjustment gears 53.53, which are supported on the case 6 by shafts 52.52, mesh with these gears. The fine adjustment gears 53, 53 are spring washers 54, 54 that provide a large resistance to their rotation, and this resistance is prevented by the rotation force of the winding shaft 2, and cannot be rotated manually. It is set in a state where it can be moved.

A part of the circumference of the above-mentioned fine adjustment gear 53.53 is
It is provided to be exposed to the outside of the case 6, and its -
On the side, knurls 55, 55 are engraved on the circumferential surface so that manual rotation can be easily performed, and scales 56, 56 for fine adjustment are formed.

Furthermore, a slider 57 that slides between the two gears 53, 53 is provided at an intermediate position of the internal adjustment gears 53, 53, and this slider 57 controls the upper and lower limit positions of the screen 13. The gear 5 is operated by a guide portion 58 that fits into the circumferential portion of the case 6 to set the gear 5.
3.53, and a protrusion 59 for operation is formed on its outer surface.

Further, inside the center part, there is a regulating protrusion 61 biased by a spring 60, and when the slurry rder 57 is in a neutral position, this protrusion 61 forms a trough with inclined surfaces 62 and 62 on both sides. The slider 57 is provided opposite to the trough of the regulation guide member 63 so as to return to the central neutral position when no external force (operating force) is applied to the slider 57 .

Further, at both ends of the slider 57, the counter 1 described above is provided.
Cam grooves 64.64 for operating the swing shafts 30.30 of the return mechanisms 7 and 17 are formed, and these cams 164.
Reference numeral 64 is in the shape of a square, and both ends thereof are formed in the same direction as the sliding direction of the slider 57, and the inner side thereof is formed in the same direction as the sliding direction of the slider 57, and the inner side is formed in the same direction as the sliding direction of the slider 57.
30 is formed to be inclined for swinging operation.

FIG. 6 shows a drive circuit for the motor 8, which consists of two coils L1. The motor 8 is formed of a capacitor motor including a capacitor L2 and a capacitor C connected in parallel thereto, and the power switch 65 not only turns the power OFF and ON, but also switches the motor 8 between forward and reverse directions.

Furthermore, the aforementioned limit switches 50, 50 are constructed with normally open contacts, and are normally turned ON by the switch operating lever 47.

In this drive circuit, when the power switch 65 is turned on to the forward or reverse position, the motor 8 is driven to forward or reverse rotation via the limit switch 50.
When 0 is turned off, the motor 8 is stopped.

The operation of the screen stop position setting mechanism configured as described above will be explained.

For example, the lower limit stop position of the screen 13, that is,
When setting the deployed position, the lower limit stop position setting mechanism 15 is operated.

First, when the slider 57 is operated toward the above-mentioned setting mechanism 15 side, the slanted portion of the cam groove 64 of the slider 57 swings the swing shaft 30 of the return mechanism.

At this time, the swing shaft 30 on the upper limit stop position setting mechanism 14 side is
Since it is located in the parallel part of the cam groove 64, it cannot be operated.

By the above-mentioned swinging operation of the swinging shaft 30, each of the gears 35 and 36 on the swinging shaft 30 is disengaged from each of the wheels 27 to 29 of the counter 17, and at the same time, the swinging frame 31 is also swinged. , each return lever 40 connected thereto is connected to each counting wheel 27 to 29.
When each counting wheel 27 to 29 is not at the set position (setting C1 value), press the return lever 40.
The cams 39 are rotated by the pressing force of the cams 39 to a position where the restriction position 41 and the return lever 40 are opposed to each other.

As mentioned above, when the cams 39 of each counting wheel 27 to 29 are returned to the set position, the counting state of each counting wheel 27 to 29 becomes the set count value set at the stop position of the screen 13, and the maximum value is reached. The recess 46 of the counting wheel 29 of the upper digit is in a state opposite to the protrusion 48 of the switch operating lever 47. That is, in this state, the stop position of the screen 13 is determined by the counter 1.
This means that it is set on the count value side of 7.

On the other hand, when the swing shaft 30 is operated to swing as described above, the operation arm 44 of the swing frame 31 moves the switch operation lever 47 to the limit switch 50 side, turns it ON, and controls the motor 8. The power line for is turned on.

In such a state, when the power switch 65 is turned on, for example, to the normal rotation side to unfold the screen 13, the motor 8 is energized and rotated in the normal rotation.

This rotation of the motor 8 rotates the winding shaft 2 in the direction in which the screen 13 is developed, and the screen 13 is developed. Further, the rotation of the winding shaft 2 described above is input from the internal gear 24 at the end to the internal gear 18 of the planetary gear differential '1fJ16, and the sun gear 22 of this differential mechanism 16
5 is fixed by the fine adjustment gear 53, so that the carrier 20 outputs an output.

The above-mentioned output is input to the counter 17, but since the swing frame 31 is operated to swing and the intermediate gear 35 is separated from the input wheel 26, the counter 17 does not rotate in steps. . Therefore, the counter 17 maintains the initially set secondary value of the stop position.

When the screen 13 is expanded by the drive of the motor 8 and reaches the desired position, the operation of the slider 57 is released. When the operating force (external force) is removed from the slider 57, the regulating protrusion 61 slides along the inclined portion 62 and returns to the center position of the regulating guide member 63 due to the biasing force of the spring 60, and the slider 57 is returned to the neutral position. .

With this release operation, the swinging operation of the swinging frame 31 is canceled, and when the swinging shaft 30 and the swinging frame 31 return to their original positions, the intermediate gear 35 meshes with the input wheel 26, and each of the counting wheels 27 to 29 Since the gears 37... mesh with the helical gears 36... of each phase,
The counter 17 becomes ready for rotation in steps.

At the same time, the operating arm 44 of the swing frame 31 separates from the switch operating lever 47, and at the same time, the protrusion 48 of this lever 47 engages with the recess 46 of the counting wheel 29, which has been waiting, and this engagement causes the limit switch to switch. 50 is turned off, the motor 8 is stopped, and the screen 13 is also stopped.

In this state, the counting status of each of the counting wheels 27 to 29 of the counter 17 has already reached the set count value of the lower limit stop position at which the limit switch 50 is turned OFF. The stop position setting operation ends.

After completing the lower limit stop position setting operation described above, the screen 13
If you want to fine-tune the expansion stop position upward or downward,
This is done by rotating the fine adjustment gear 53 in the forward or reverse direction.

That is, when the motor 8 is stopped and the screen 13 is stopped, the rotational load on the winding shaft 2 side is large. Therefore, the internal gear 18 of the M star gear differential mechanism 16 is stopped with a large rotational load.

When the above-mentioned fine adjustment gear 53 is rotated in this state, the adjustment shaft 25 is rotated via the gear 51, and the sun gear 22 fixed to this adjustment shaft 25 is rotated in the forward or reverse fine adjustment direction. Ru. At this time, since the rotational load on the internal gear 18 is large as described above, the carrier 20, which has a small rotational load, is rotated, and this rotation causes the counter 17 to move slightly in the forward or reverse direction (carry up or down). Steps are taken in the adjustment direction.

In other words, when the counter 17 is incremented in either the forward or reverse direction, it means that the set count value of the counter 17 is increased or decreased in the fine adjustment direction while the screen 13 is stopped. 13, the OFF operating position of the limit switch 50 is changed.

In this state, the screen 13 should be wound up once).
After reversing the rotation speed 8, if the motor 8 is driven to the normal rotation side again in the direction in which the screen 13 is developed, the limit switch 50 is turned off at the finely adjusted position, and the screen 1
3 stops the expansion at the fine adjustment position.

This stop position becomes the set position of the stop position of the screen 13.

Screen 13 with the lower limit position set as described above
In normal unfolding use, the motor 8 is driven in normal rotation from the winding position of the screen 13 to rotate the winding shaft 2 and the screen 13 is unfolded.

When the screen 13 mentioned above is located within the lower limit stop setting position (
(a value smaller than the set count value), counter 17
Since the recess 46 of the counting wheel 29 of the highest digit is not engaged with the protrusion 48 of the switch operation lever 47, the limit switch 50 is in the ON state and the power line of the motor 8 is in the ON state. Therefore, if the power switch 65 is turned on in the normal rotation side, the motor 8 is driven and the screen 13
is expanded.

When the winding shaft 2 described above rotates, the amount of rotation is inputted to the counter 17 via the planetary gear differential mechanism 16, and the counter 17 steps in the carry direction to count the amount of rotation.

When the above-mentioned counter 17 counts the set rotation m (set count value) of the lower limit stop position, the recess 4 of the counting wheel 29 of the maximum upper digit
6 engages with the protrusion 48 of the switch operation lever 47 and moves.

With this movement, the limit switch 50 is turned off, so the motor 8 is stopped and the screen 13 is stopped at the lower limit stop position.

If the weight a of the screen 13 is heavy, and due to its weight inertia,
If the self-lock II mechanism 10 of the motor 8 performs an incomplete operation and the winding shaft 2 rotates excessively even though the motor 8 is turned off, the counting wheel 27 of the lower digit of the counter 17 will rotate. Although the above-mentioned extra rotation moves in the carry direction, it does not move up to the counting wheel 29 of the upper digit, so
That is, since the counting wheel 29 maintains the state in which the limit switch 50 is turned off via the switch operation lever 47, the limit switch 50 will not be turned on again due to the above-mentioned extra rotation.

According to the screen stop position setting m structure of the above-mentioned embodiment,
Wind up or unfold the screen 13 by operating the slider 57, and when the screen 13 moves to the desired position, release the operation of the slider 57 to stop the movement of the screen 13, and the setting of the stop position will be set. Once completed, if the fine adjustment gear 53 is rotated in this state, the set position can be finely adjusted, and the stop position of the screen 13 can be set with a simple operation.

In addition, in the above-mentioned embodiment, the unfolding direction of the screen 13,
That is, although the setting operation of the lower limit stop position and its fine adjustment operation have been described, the operation of setting the upper limit stop position and its fine adjustment operation also involve operating the upper limit stop position setting mechanism 14 in the same way as the above-mentioned operations. The explanation will be omitted.

In the correspondence between the configurations of this invention and the embodiment, the switch operating section includes the recesses 46 of the two counting wheels and the switch operating lever 4.
7, the switch corresponds to limit 1-switch 50, and the other configurations correspond to the same part names in the embodiment.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a cross-sectional configuration diagram showing a schematic mechanism of a screen winding device; FIG. 2 is an exploded perspective view of a screen stop device; FIG. 3 is a sectional view thereof; 4 is an exploded perspective view of the stop position setting mechanism, FIG. 5 is a sectional side view of the counter, and FIG. 6 is a power supply circuit diagram. 1... Screen winding device 2... Winding shaft 8.
...Motor 13...Screen 14...Upper limit stop position setting mechanism 15...Lower limit stop position setting mechanism 16...Planetary gear differential mechanism 17...Counter 18...Internal gear 20
... Carrier 22 ... Sun gear 25 ... Adjustment shaft 27 - 29 ... Counting wheel 30 ... Swing shaft 31 ...
- Swing frame 39...Cam 40...Return lever 44...Operation arm 46...Concave portion 47...Switch operation lever 53...Gear for fine adjustment

Claims (1)

[Claims] 1. A screen winding device that winds up or unfolds a screen by controlling a winding shaft in forward and reverse directions using forward and reverse outputs of a motor, the winding device being capable of winding or unrolling a screen in response to movement of the screen toward a stop position. A counter is provided with a plurality of counting wheels that sequentially carry and add up the amount of rotation from the take-up shaft, and the rotation is made less than one rotation with respect to the maximum movement of the screen, and the amount of rotation from the lower digit counting wheel is A switch operation part is formed on a counting wheel that rotates intermittently by carry rotation, and when the counter counts the set count value set as the stop position of the screen, the switch operation part of the counting wheel with the switch operation part controls the motor. A screen stop mechanism for a screen winding device in which a switch for controlling OFF is installed opposite the counter. 2. The screen winding device according to claim 1, wherein the counter is provided with a return mechanism for returning the counting state of the counter to a set count value set as a stop position of the screen. 3. The switch operation part of the counting wheel with the switch operation part is formed of a recess, and a switch operation lever that engages with the recess when the counter counts the set count value is disposed opposite to this counting wheel. 4. A screen stop mechanism for a screen winding device according to claim 1 or 2, characterized in that the lever is configured to turn off a switch by the movement of the lever when it engages with the recessed portion. The rotation of the winding shaft is input to the internal gear of the planetary gear differential mechanism, and the rotation is output from the carrier, and the sun gear is fixed so that it can be rotated for fine adjustment from the outside. The screen of the screen winding device according to claim 1, 2, or 3, characterized in that the rotational output of the carrier is input to a counter in correspondence with the movement of the screen toward the stop position. Stopping mechanism.