JPS60248548A - Screen stop position setting mechanism of screen winder - Google Patents

Abstract

PURPOSE:To finely adjust the stop position of a screen simply only by turning a sun gear from the outside. CONSTITUTION:In case of finely adjusting the position of stopping unfolding of a screen up and down after the completion of setting the lower limit stop position, a gear 53 for fine adjustment is turned, and a sun gear 22 fixed to an adjusting shaft 25 through a gear 51 is turned in normal or reverse direction of fine adjustment. At this time, a motor is stopped to stop the screen, and a carrier 20 having small turning load is turned, because the internal gear of a planetry gear differential mechanism on take-up shaft 2 side has large turning load. This movement of the carrier 20 causes a counter 17 to move in normal or reverse direction of fine adjustment (take a figure up or down) step by step. That is, the set count value of the counter 17 is adjusted to increase or decrease for fine adjustment with the screen stopped by moving the counter 17 in normal or reverse direction step by step. This results in that in case of unfolding the screen next time, the position of off operation for a limit switch 50 is changed.

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 position setting mechanism that sets a 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 the 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 movement position is detected. However, conventionally, a screw feeding mechanism is formed by a long threaded rod and a pinion that reciprocates along this threaded rod.
There is a device that controls the stop of the motor by operating a switch by moving the 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. In addition, not only is the operation of setting the stop position cumbersome, but
This had problems such as low positional accuracy of stop control.

(c) Purpose of the Invention The present invention can be constructed compactly enough to be stored inside the winding shaft, and furthermore, the setting operation and fine adjustment operation of the screen stop position are simplified, and the accuracy of the screen stop position is improved. An object of the present invention is to provide an improved screen stop position setting mechanism for a screen winding device.

(D) Summary of the Invention This invention inputs the rotation of a screen winding shaft into an internal gear of a planetary gear differential mechanism, outputs the rotation from its carrier, and allows fine adjustment of the sun gear from the outside. A counter is provided with a plurality of counting wheels that are fixed so as to be rotatable and that sequentially advance and count the amount of rotation inputted from the carrier, and a set count value is set to this counter as the stop position of the screen. A return mechanism is provided to restore the counting state of the counter, and a switch is provided opposite to the counter that controls the motor to turn off when the counter counts the set count value and turns on the motor when the return mechanism is operated. The present invention is characterized in that it is a screen stop position setting mechanism for a screen winding device.

(E) Effects of the Invention According to this invention, when the counter is reset with the sun gear of the planetary gear differential mechanism fixed, the count value of the counter becomes the set count value set as the stop position of the screen. , This completes setting the screen stop position on the counter side.

Moreover, in this state, that is, when the counter is reset, the switch is turned ON, the motor is controlled ON, and the winding shaft is rotated, so that the screen is placed at the desired position for winding or unfolding, and at the stop position of the screen. You can move the screen with the settings set on the counter, and if you cancel the return operation of the counter after moving to the desired position, the screen stop position has already been set on the counter side, so the release position of this operation will be the screen This is the set stop position.

As a result, the stopping position of the screen can be set by returning the counter to move the screen and canceling the return operation at the desired position, making the setting operation extremely simple.

Furthermore, when fine-tuning the stop position of the screen, when the screen is stopped, rotate the sun gear of the planetary gear differential mechanism externally in the forward or reverse fine-adjustment direction, and the set count value of the counter can be adjusted. can be increased or decreased in the direction of fine adjustment, thereby changing the stop setting position on the counter side in the forward or reverse direction, and then stopping at the position of the finely adjusted set count value of the counter.

This allows fine adjustment of the screen stop position by simply rotating the sun gear from the outside, making the fine adjustment operation extremely simple.

Furthermore, since the amount of rotation of the winding shaft is counted by a counter using multiple wheels, even if the amount of winding of the screen is large,
The amount of rotation can be counted regardless of the amount of rotation, and the configuration for detecting the amount of screen movement is simplified and compact, allowing it to be configured inside the winding shaft. The removal device can be made smaller, and since the motor is controlled to stop based on the count value of the counter, there is almost no error and highly accurate stop control can be obtained.

(f) Examples of the invention An embodiment of the present invention will be described in detail below based on the drawings.

The drawing shows the screen stoppage of the screen winding device (2). In FIG. 1, this screen winding device 1 is provided with a rotatable cylindrical winding shaft 2, an appropriate screen is wound around the outer peripheral surface of this winding shaft 2, and the winding shaft 2 is By being rotated in the forward or reverse direction, the screen is wound up or unfolded, and a support shaft 4 is supported at one end of this winding shaft 2 via a bearing 3, and the other end is supported by a screen described later. It is supported by a case 6 of the stop position setting device 5 via a bearing 7, and these support shafts 4 and case 6 are mounted on a fixed wall or a member (
(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 screen stop position @ setting device 5 side of the winding shaft 2 mentioned above. A speed reduction mechanism 9 such as a planetary gear speed reduction mechanism is housed on one side, and the output of the aforementioned motor 8 is reduced by this speed reduction mechanism 9, and the winding shaft 2 is driven by this speed reduction output. Ru.

A self-lock mechanism 1O is housed on the other side of the motor 8, and when the motor 8 is stopped, the self-lock 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 housing for the motor 8 and the lead wires that connect the capacitor to the 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 t-Y8, respectively,
Since the mechanisms have the same configuration, only one mechanism 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, and 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 mechanism 16 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 side, there is an upper digit counting wheel 28.2 at one place on the circumference.
9 intermittently is formed, and on the swing shaft 30 facing the position between the adjacent counting wheels 27 to 29, the adjacent gears 37 and the digits are arranged. A shift gear 36 that meshes with the feed pawl 38 is supported in an idle rotation 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 sub 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. When the cam 39 is in contact with the cam 39, 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. to drive and control the motor 8.

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 middle portion of the switch operating lever 47 is designed to engage with the four portions 46 described above 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 control limit switch 50 is provided oppositely, and the switch operating lever 47 is biased toward the counting wheel 29 by its push button.

The switch operation lever 47 is provided so that when its protrusion 48 engages with the recess 46 of the counting wheel 29 and moves, the limit switch 50 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 50.

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. The fine adjustment gears 53 and 53 are spring washers 54 and 54, which provide a large resistance to their rotation, and this resistance prevents their rotation from being rotated by the rotation force from the winding @2, and manual rotation is prevented. is set to be possible.

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, a knurling 55.55 is engraved on the circumferential surface for easy manual rotation, and a scale 56.56 for fine adjustment is formed.

Furthermore, the above-mentioned internal adjustment gear 53. ! 53 is provided with a slider 57 that slides between both gears 53 and 53, and this slider 57 is operated to set the upper and lower limit stop positions of the screen 13,
It is provided so as to be slidable between the gears 53 and 53 by a guide portion 58 that fits around the circumference of the case 6, and a protrusion 59 for operation is formed on the outer surface of the guide portion 58.

Further, inside the center part, there is a regulating protrusion 61 biased by a spring 60, and when the slider 57 is in the neutral position, this protrusion 61 is a regulating guide with valleys formed by inclined surfaces 62 and 62 on both sides. The slider 57 is provided opposite to the trough of the 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 shaft 30.30 of the return mechanism of 7.17 are formed, and these cam grooves 64.64.
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 has two coils L'1. L2 and a capacitor C connected in parallel to the capacitor motor, 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 o 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 device 41115 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 (set target value), the return lever 40 is pressed.
The cams 39 are rotated by the pressing force 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 H1 wheel 29 of the upper digit is in a state opposite to the protrusion 48 of the switch operation 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 supply line for is in the ○N state.

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 mechanism 16, and the sun gear 22 of this differential mechanism 16 is finely adjusted by the adjustment shaft 25. Since the carrier 20 is fixed by the gear 53, an output is generated from the carrier 20 because it is in a fixed state.

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 count 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 on the inclined surface 62 by the biasing force of the spring 60 and is returned to the center position of the regulating guide member 63, and the slider 57 is returned to the neutral position. .

With this release operation, the swinging operation of the swinging frame 31 is released, and the swinging shaft 30. When the swing frame 31 returns to its original position, the intermediate gear 35 meshes with the input wheel 26, and the gears 37 of each counting wheel 27 to 29 mesh with each phase helical gear 36.
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 planetary gear differential mechanism 16 is stopped under 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 pad p22 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 word value of the counter 17 is increased or decreased in the fine adjustment direction while the screen 13 is stopped, and the next time the screen is 13, the OFF operating position of the limit switch 50 is changed.

In this state, the motor 8 is rotated in the opposite direction to wind up the screen 13, and then the motor 8 is rotated again in the direction in which the screen 13 is unfolded.
Drive control I to forward rotation side? 1', the limit switch 50 is turned off at the finely adjusted position, and screen 1 is turned off.
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 applied to the counter 17 via the planetary gear differential mechanism 16.
The counter 17 steps in the carry direction and counts the amount of rotation.

When the above-mentioned counter 17 counts the set rotation amount (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 of the screen 13 is heavy, due to its weight inertia,
If the self-locking 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 as described above. Although the extra rotation causes the count wheel to advance in the carry direction, the count wheel 29 is not advanced to the maximum upper digit, that is, the count wheel 29 is in a state where the limit switch 50 is turned off via the switch operation lever 47. Since the limit switch 50 is maintained, the above-mentioned extra rotation causes the limit switch 50 to move again.
is never in the ON state.

According to the screen stop position setting mechanism of the above 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.

Further, in the above embodiment, the switch operation lever 47
is configured to engage with the recess 46 of the counting wheel 29 of the largest upper digit to operate the limit switch 50, but both counting wheels 27, 29 of the smallest lower digit and the largest upper digit, or all counting wheels 27 to 2
The switch operation lever 47 may be configured to act on the switch 9.

Further, the return mechanism of the counter 17 is provided to return (oscillate), but a switch other than the limit switch 50 is provided to be turned on by the return operation, and this switch line turns on the power line of the motor 8. It is good to provide it as much as possible.

In the correspondence between the configurations of this invention and the embodiment, the return mechanism includes a swing shaft 30, a swing frame 31, a cam 39, a return lever 40
The switch corresponds to the limit switch 50, and the other configurations correspond to the same part names in the embodiment.

[Brief explanation of drawings]

The drawings show one 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 position setting device, and FIG. 3 is a sectional view thereof. , FIG. 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... Fufu Lean Arashi I/1 Kinutai 900. Arashi WV Ritsumugi 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...Fine adjustment gear Fig. 1/

Claims (1)

[Scope of 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 having the above-mentioned winding mechanism applied to an internal gear of a planetary gear differential mechanism. While inputting the rotation of the take-up shaft, 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, and the amount of rotation input from the carrier is sequentially fed. A counter equipped with a plurality of counting wheels for counting is provided, and
This counter is equipped with a return mechanism that returns the counting state of the counter to the set count value set as the screen stop position. A screen stop position setting mechanism for a screen winding device with a switch opposite to the counter.