JPH0127937B2 - - Google Patents

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 screen winding device described above 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, a detection method is used to detect the moving position of the screen. A screen stop position setting mechanism must be provided for controlling the drive of the motor to stop using this detector.

In the screen stop position setting mechanism described above, for example, when the amount of movement of the screen is replaced with the amount of rotation of the take-up shaft, and the amount of rotation of this take-up shaft is counted by a counter, and the counted value of the counter reaches the set value. , a counter method for controlling the motor to stop may be considered.

In other words, the amount of rotation of the winding shaft is counted by a counter equipped with a plurality of counting wheels that sequentially advance and count, and when the count value of this counter reaches the count value that stops the screen, a lever is activated to turn a switch. It is conceivable to configure the motor to be controlled to stop by turning it off.

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

However, in the case of the above-mentioned counter method, if you set the stop position of the screen at any position, the count value of the counter will not be specified. When setting the value to ``000'' and stopping the screen, it is necessary, for example, to sequentially subtract from the base position and, when the above-mentioned set count value ``000'' is detected, to stop the motor.

When setting the stop position of the screen mentioned above,
Normally, counters are equipped with a reset mechanism that resets the counted value to "000", so operate this reset mechanism to first set the counter value to "000" and then maintain this "000" state. After moving the screen to the desired stop position while keeping the screen in place, the motor is stopped and at the same time, the return operation is released.

However, the drive and stop control of the motor and the return operation and release of the return mechanism described above are configured to be operated in conjunction with one operation member in order to simplify these operations. motor
When the OFF control is performed, the return mechanism is released at the same time, and the counter immediately becomes ready for counting.

On the other hand, even though the motor was stopped, the winding shaft and screen's weight inertia caused
Since it rotates a little extra, this rotation causes the value of "000" on the counter that is in a counting-enabled state to be converted into a decimal number, and the value at the time of setting becomes incorrect.

Therefore, if you use this setting as usual, the screen stop position will be incorrect by the amount of rotation calculated by the above-mentioned counter, and the screen stop position will be different from the set stop position and the stop position when actually used. A problem arises in that they do not match.

(c) Purpose of the Invention This invention provides a method for setting the stop position of a screen using a count value of a counter.
A time lag is provided between the control and the counter return operation, and after the inertial rotation of the winding shaft has ceased,
To provide a screen stop position setting mechanism capable of eliminating an error in the stop position of a screen between setting and use by canceling a return operation of a counter, and constantly stopping at a set position.

(D) Summary of the Invention The present invention provides a setting operation lever that is operated from outside the device, and the setting operation lever has the following features:
a first operation unit that operates a switch for controlling the motor OFF and ON via a switch lever;
A second operating section is provided for returning the counter's return mechanism, and each of these operating sections allows the counter to return to the returning state after the setting operation lever is switched from ON to OFF after the operation of the first operating section is completed. The screen stop position setting mechanism is characterized in that the screen stop position setting mechanism is arranged with a time lag between both the operating parts so that the second operating part is in the operating state.

Furthermore, when the rotation of the winding shaft is inputted to the counter via the planetary gear differential mechanism, a third operation section is configured to operate the sun gear of the planetary gear differential mechanism to be fixed and rotatable on the setting operation lever. The operating section has a screen stop position setting mechanism arranged with a time lag between the operating section and the second operating section so that the sun gear is fixed after the operation of the second operating section is completed. It is characterized by

(E) Effects of the Invention According to the present invention, when setting the stop position of the screen, the setting operation lever for performing this setting operation includes a first operation section for turning the motor OFF and ON, and a return mechanism for the counter. Since a time lag is set between the motor and the second operation section that operates the
Furthermore, the return operation of the counter return mechanism can be canceled after the rotation due to weight inertia of the winding shaft has stopped, and the screen is reliably prevented from advancing due to rotation due to weight inertia of the winding axis. , the screen stop position can be set accurately without going out of order.

This reliably prevents the actual stop position of the screen during use from being deviated from the set stop position, and provides accurate screen stop control.

Furthermore, the above-mentioned counter is usually provided with an input wheel consisting of a gear in front of the counting wheel of the smallest lower digit, and when a return operation is performed, this input wheel is connected to the digit of the smallest lower digit counting wheel that is in meshing relationship with the input wheel. The feed gear and its meshing are disengaged, but when the return operation is released, these input wheels and the shift gear are meshed again.

During this meshing, after the tooth tips of each gear collide, when the shift gear is turned in either the forward or reverse direction and engages, the set count value of the counter is incremented by the amount of rotation. The stopping position when using the screen will be different from the setting.

However, if the rotational output from the carrier or internal gear of the planetary gear differential mechanism is directly connected to the counting wheel of the minimum lower digit of the counter, and there is no gear to engage and disengage the mesh, when the return operation is released, Since the counter does not advance due to the collision of the gear teeth,
Counter errors are reliably prevented.

Furthermore, there is also a time lag between the second operating section that operates the above-mentioned setting operating lever to return and the third operating section that operates the sun gear of the planetary gear differential mechanism to the fixed and rotatable states. As a result, the operation of the set value set on the counter is independent from other operations, and the set value set on this counter is reliably prevented from being distorted due to interference from other operations. .

(F) Embodiment of the Invention An embodiment of the invention will be described in detail below based on the drawings.

The drawing shows a screen stop position setting mechanism of a screen winding device. In FIG. 1, this screen winding device 1 is provided with a rotatable cylindrical winding shaft 2, and A suitable screen is wound around the screen, and the screen is wound up or unfolded by rotating the winding shaft 2 in the forward or reverse direction.

A support shaft 4 is supported at one end of the above-mentioned winding shaft 2 via a bearing 3, and the other end is supported via a bearing 7 by a case 6 of a screen stop position setting device 5, which will be described later. 4 and the case 6 are attached to a fixed wall or a mounting member (not shown), whereby 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. A deceleration mechanism 9 such as a planetary gear deceleration mechanism is housed on one side of the 8, and the output of the motor 8 described above is decelerated by this deceleration mechanism 9, and the winding shaft 2 is controlled by this deceleration output. Driven.

A self-locking mechanism 1 is provided on the other side of the motor 8 mentioned above.
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, and the capacitor for operation connected to the above-mentioned motor 8 is stored.

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 the winding shaft 12 via a suitable 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 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. These mechanisms 14 and 15 operate in response to the forward rotation and reverse rotation of the motor 8, respectively, and since the mechanisms have the same configuration, one mechanism will be described.

That is, the stop position setting mechanisms 14 and 15 described above include the planetary gear differential mechanism 16 and the counter 17.
The planetary gear differential mechanism 16 has an internal gear 18, a plurality of planetary gears 21 that mesh with the internal gear 19 of this gear 18 and are pivotally supported by a carrier 20, and a sun gear 22 that meshes with this planetary gear 21. and an external gear 23 formed on the outer peripheral surface of the internal gear 18 described above.
meshes with the internal gear 24 formed on the inner circumferential surface of the end of the winding shaft 2 described above, and the rotation of the winding shaft 2 is input.

The sun gear 22 described above is fixed to a fixing shaft 25 installed on a support frame 32, which will be described later. When the fixing shaft 25 is in a fixed state, the sun gear 22 is fixed, and the planetary gear differential mechanism 16 An output is generated from the carrier 20.

Note that when the sun gear 22 described above is in a rotatable state and there is a load on the carrier 20, the output of the differential mechanism 16 rotates the sun gear 22, and the carrier 20 is not rotated.

The aforementioned counter 17 has three counting wheels 27, 2
These counting wheels 27 to 29 are supported in an idling state on the above-mentioned fixing shaft 25, and the counting wheel 27 of the lowest lower digit is integrated with the carrier 20 of the above-mentioned planetary gear differential mechanism 16. connected, that is, directly connected.

A swing shaft 30 is provided at a position facing the above-mentioned counting wheels 27 to 29, and this swing shaft 30 is connected to the swing frame 3.
1, and the swing frame 31 is swingably supported by a support shaft 33 with respect to the support frame 32,
The support shaft 33 is biased toward the counting wheels 27 to 29 by a spring 34 wound around the shaft end.

On one side of each of the counting wheels 27 to 29 mentioned above, a gear 37 for rotating each of the counting wheels 27 to 29 is formed in series, and on the other side, an upper girder is provided at one place on the circumference. Shift pawls 38 for intermittently shifting the counting wheels 28, 29 are formed, and on the swing shaft 30 facing the positions between the adjacent counting wheels 27 to 29, adjacent gears 37 are formed. The shift gears 36 meshing with the shift claws 38 are supported in an idling state.

Each counting wheel 2 of the counter 17 having the above-described configuration
7 to 29, the number of gears is set so that 10 rotations of each rotates the counting wheel of the next upper digit once, and although the counting wheel 27 of the smallest lower digit rotates continuously, Counting wheels 28 and 29 are digit feed pawls 38
Intermittent rotation occurs due to one rotation of shift rotation.

Also, the counting wheel 29 of the largest upper digit is on the screen 13.
The rotation is set to be less than one rotation relative to the maximum amount of movement.

When the counting wheel 27 of the lowest lower digit is rotated once by the carrier 20 of the differential mechanism 16 in the previous stage, the digit feeding pawl 38 of this counting wheel 27 carries up and rotates the digit feeding gear 36 in the next stage. However, by sequentially transmitting such carry rotation, each counting wheel 27 to 29
are shifted sequentially.

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 counting wheels 27 to 29 of the counter 17.

Note that the counting direction of the counter 17, that is, the digit feeding direction of each counting wheel 27 to 29 is determined by the screen 13.
For example, in the case of lower limit setting, screen 1
3 is added, ie, carried, by moving in the development direction, and when the upper limit is set, it is added, ie, carried, by moving in the winding direction.

Each of the above-mentioned counting wheels 27 to 29 and each of the digit feed gears 3
6 and 36 are formed with a return mechanism for returning the counting state to the set count value set as the upper or lower limit stop position of the screen 13, for example, "000".

As shown in FIG. 5, a heart-shaped cam 39 is formed on the side surface of each counting wheel 27 to 29 on the gear 37 side, and a swing frame 31 facing this cam 39
is connected with a return lever 40, and when the swing frame 31 is operated to swing, the return lever 40 comes into contact with the above-mentioned cam 39, rotates the cam 39 by the contact pressure, and rotates the cam 39. 39 so as to be always opposite to the restriction position 41, and this restriction 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. By rotating the cam 39 to this home position, the counting state can be returned to the set count value ("000" in the above example) with the counting wheels 27 to 29 at the stop position.

On the other hand, each of the above-mentioned shift gears 36, 36 is formed with a square shaft portion 42, and when the swinging frame 31 is rocked (returning operation),
Each digit feed gear 3 is in contact with the flat surface of the square shaft portion 42.
6, 36 rotational position to a constant posture, that is,
A return plate 43 is provided oppositely arranged so that when the swinging operation is released, the tooth tips of the digit feed gears 36, 36 and gears 37, 37 mesh with each other without coming into contact with each other. It is formed of a leaf spring, and its base end is fixed to the support frame 32, and its free end comes into contact with the square shaft part 42.

As shown in FIG. 6, a recess 44 is formed on the circumferential surface of the counting wheel 29 of the largest upper digit, and this recess 44 has a gentle slope 44a on the upper side in the rotation direction of the counting wheel 29. The lower side thereof is formed into a vertical surface 44b that coincides with the radial direction.

A switch lever 45 is provided opposite to the above-mentioned counting wheel 29, and the base end of this switch lever 45 is connected to the shaft 4.
A rotor 47 is pivotally connected to the support frame 32 via a rotor 47 at an intermediate position, facing the circumferential surface of the counting wheel
is pivotally supported by a pin 48, and a protrusion 49 is provided in succession on the circumferential surface of the rotor 47 in the connection direction on the side opposite to the vertical surface 44b of the recess 44, and this protrusion 49 is It is formed to have a length shorter than the depth of the recess 44, and its position is regulated by a stopper 50 directed toward the vertical surface 44b, and is urged toward the stopper 50 by a spring 51.

The above-mentioned protrusion 49 normally comes into sliding contact with the circumferential surface of the counting wheel 29, and furthermore, the counting wheel 29 is reset by the above-mentioned cam 39 and the return lever 40, and the set count value (which is set as the stop position of the screen 13) When it is at the value "000" in the above example, it is positioned so that it fits into the recess 44 and moves toward the counting wheel 29 side.

Further, when the above-mentioned protrusion 49 is in the fitted state with the recess 44, when the counting wheel 29 further rotates, the protrusion 49 is pushed by the shoulder of the vertical surface 44b of the recess 44 and resists the spring 51. This rotation brings the circumferential surface of the rotor 47 into sliding contact with the circumferential surface of the counting wheel 29, so that the position of the switch lever 45 remains unchanged.

This operation is performed so that after the limit switch 52, which will be described later, is controlled to be OFF by the recess 44 of the counting wheel 29, the limit switch 52 will not be turned ON even if the counting wheel 29 further rotates and the recess 44 exceeds the position of the protrusion 49. It acts on

A limit switch 52 for controlling the motor 8 to turn off is provided on the back side of the free end of the switch lever 45, and the switch lever 45 is biased toward the counting wheel 29 by its push button 53.

When the switch lever 45 moves with its projection 49 fitting into the recess 44 of the counting wheel 29,
Based on this movement, limit switch 52 is
When the protrusion 49 is in sliding contact with the circumferential surface of the counting wheel 29, turn on the limit switch 52.
arranged for operation.

As shown in FIG. 7a, each counter 1 mentioned above
A fixing spring 54 is elastically fastened to the outer end of the fixing shaft 25 passing through the fixing shaft 25, one end of which is fixed to a locking tool 55 fixed to the side surface of the support frame 32, and the other end is It's open. When this open end is in the open state, the fixing shaft 25 is
is fixed and when this open end is expanded, the fastening is loosened and the fixing shaft 25 becomes rotatable.

Further, on the side surface side of the support frame 32 where the above-mentioned fixing spring 54 is located, the end of the above-mentioned swing frame 31 is projected, and an actuation piece 56 connected to the switch lever 45 is located. Spring 54, swing axis 3
0. At a position corresponding to the actuating piece 56, a setting operation lever 58 having a shaft 57 supported by the case 6 is provided oppositely.

As shown in FIG. 8, the setting operation lever 58 described above is provided with three operation sections 59, 60, and 61 each formed in a cam shape.

The first operating portion 59 contacts and moves the operating piece 56 of the switch lever 45, and turns on the limit switch 52 via the switch lever 45.

The second operating section 60 is connected to the swing shaft 3 of the counter 17.
0, and by swinging the swinging frame 31 via this swinging shaft 30, the return mechanism is operated to return, and when the swinging shaft 30 rides on the circumference 60a. , the return state is maintained.

The third operation part 61 is in contact with the open end of the fixing spring 54, and operates to release the fastening of the spring 54, release the fixation of the fixing shaft 25, and make it rotatable. When the open end of 54 rides on the circumference 61a, the rotatable state is maintained.

A time lag, that is, a gap between operations, is set for each of the above-mentioned operation sections 59 to 61 so that the operation timings are different between each of them.

That is, when the first operating section 59 operates the switch lever 45 to turn the limit switch 52 from ON to OFF, the second operating section 60
positions the swing shaft 30 on its circumference 60a and maintains the return operation, and after the second operation section 60 releases the return operation of the counter 17, the third operation section A time lag is set so that the sun gear 22 is fixed via the fixing shaft 25.

Also, to explain from the operating direction of the setting operating lever 58, first the fixing spring 54 is moved to the third operating section 61.
After it is released, the second
The operating section 60 swings the swinging shaft 30, and then, while performing this swinging operation and holding the above-mentioned spring 54 in the open state, the first operating section 59 controls the switch lever 45 to turn off and turn on. It is set up so that it can be done.

In order to regulate the operation positions of each of the above-mentioned operation parts 59 to 61, a regulation groove 6 is provided in the setting operation lever 58.
This regulating groove 62 is formed with three concave regulating parts 62a, 62b, and 62c, and these regulating parts 62a to 62c are positioned by engaging with a pin 63 implanted in the case 6. Regulated.

Note that this engagement is performed by elastic displacement of the outer wall of the regulating groove 62.

Further, the setting operation lever 58 has a protrusion 64 for rotating the setting operation lever 58 so as to protrude outward from the case 6 .

FIG. 9 shows a drive circuit for the motor 8.
is two coils L1 and L2 connected in series,
It is formed by a capacitor motor with a capacitor C connected in parallel to these, and the power switch 65
In addition to turning the power OFF and ON, it also switches the motor 8 between forward and reverse rotation.

Furthermore, the aforementioned limit switches 52, 52 are composed of normally open contacts, and are normally operated by the switch lever 45.
It is turned ON.

This drive circuit turns on the limit switch 5 when the power switch 65 is turned on to the forward or reverse position.
When the motor 8 is driven forward or reverse through the motor 2 and the limit switch 52 is turned off,
Motor 8 is stopped.

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

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

First, as shown in FIG. 7, the above-mentioned setting mechanism 15
When the setting operation lever 58 on the side is pulled up to the regulation position 62a and operated, the lever 58
When the controller escapes from the regulating portion 62c, the third operating portion 61
expands the open end of the fixing spring 54, releases the fixation of the fixing shaft 25, and the sun gear 22 becomes rotatable.

Further, when the lever 58 reaches the regulating part 62b (see FIG. 7a), the second operating part 60 moves the swing shaft 30 of the return mechanism while the above-mentioned fixing shaft 25 is kept unlocked. It comes in contact with and is operated by swinging.

By the above-described rocking operation of the rocking shaft 30, each digit feed gear 36 on the rocking shaft 30 moves each counting wheel 2 of the counter 17.
7 to 29, and the swing frame 31 is also operated to swing at the same time, each return lever 40 connected thereto
... presses the cam 39 of each counting wheel 27 to 29,
When each of the counting wheels 27 to 29 is not at the set position (the set count value, for example, "000"), the cams 39 are moved to the regulating position 41 by the pressing force of the return lever 40.
and the return lever 40 are rotated to a position where they are opposed to each other.

In addition, since the counting wheel 27 of the lowest lower digit is directly connected to the carrier 20, this carrier 20 is rotated,
This rotation is allowed because the sun gear 22 is in a rotatable state as described above.

As mentioned above, the cam 39 of each counting wheel 27-29
... is returned to the set position, each counting wheel 27 to 2
The counting state of 9 is the set count value (for example, "000" value) set at the stop position of the screen 13,
The protrusion 49 of the rotor 47 of the switch lever 45 fits into the recess 46 of the counting wheel 29 of the largest upper digit.

That is, in this state, the stop position of the screen 13 is set on the count value side of the counter 17.

Further, when the setting operation lever 58 reaches the regulating part 62a (see FIG. 7c), the return operation of the counter 17 is maintained as described above, and the fixing shaft 25 is released, and the rotation of the sun gear 22 is stopped. While maintaining the enabled state, the first operating portion 59 contacts the operating piece 56 of the switch lever 45 to move it.

When the operating piece 56 is operated as described above, the switch lever 45 is moved to the limit switch 52 side and turned on, and the power line to the motor 8 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 to the internal gear 18 of the planetary gear differential mechanism 16 from the internal gear 24 at the end, but the sun gear 22 of this differential mechanism 16 is Since it is in a rotatable state, this sun gear 22 is rotated and the carrier 2
0 maintains the stopped state, and no amount of rotation is input to the counter 17. Therefore, the counter 17 maintains the initially set count value of the stop position.

When the screen 13 is expanded and reaches the desired position by the drive of the motor 8 described above, the setting operation lever 58 is activated.
is switched from the regulating part 62a to the preceding regulating part 62b (see FIG. 7b).

With this operation, the operation of the operating piece 56 of the switch lever 45 in the first operating section 59 is released, so the limit switch 52 is turned OFF and the motor 8 is controlled to stop.

When the motor 8 is stopped, the screen 13 rotates slightly due to inertia due to the weight of the screen 13 and the winding shaft 2, and then stops.

During the rotation of the above-mentioned weight inertia, the setting operation lever 5
8 is a regulating portion 6 that holds the return operation of the counter 17;
2b, the set value of the counter 17 is not incremented and is maintained at the initial established value.

When the setting operation lever 58 is moved to the restriction part 62c after the rotation due to the above-mentioned weight inertia has been confirmed to be stopped, the operation part 60 of the lever 58 is moved during this movement process.
is released by moving away from the swing axis 30.

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 protrusion 4 of the rotor 47 of the switch lever 45
9 is fitted back into the recess 44 of the counting wheel 29 and becomes the initially set value (for example, the value of "000").
Further, the gears 37 of each of the counting wheels 27 to 29 mesh with each of the shift gears 36, so that the counter 17 can rotate in steps.

When the aforementioned setting operation lever 58 reaches the restriction part 62c (see FIG. 7a), the third operation part 61 releases the opening end of the fixing spring 54 from spreading.
The fixing spring 54 returns elastically and fixes the fixing shaft 25 with its tightening force, and the sun gear 22 is fixed, making it possible to input the amount of rotation from the winding shaft 2 to the counter 17.

At the time when the setting operation lever 58 is placed in the restriction part 62c (when the setting operation is completed), the counting state of each counting wheel 27 to 29 of the counter 17 has already been set to the lower limit stop position at which the limit switch 52 is turned OFF. Screen 1
The operation for setting the lower limit stop position in step 3 is completed.

In normal unfolding use of the screen 13 whose lower limit position is set as described above, 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 above-mentioned screen 13 is at a position within the lower limit stop setting position (a value smaller than the set count value), the recess 44 of the counting wheel 29 of the maximum upper digit of the counter 17 is in contact with the protrusion 4 of the rotor 47 of the switch lever 45.
Since it is not mated with 9, the limit switch 52
is in the ON state, and the power line of motor 8 is
It is in the ON state. Therefore, the power switch 65
When 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 amount (set count value) of the lower limit stop position, the recess 44 of the counting wheel 29 of the highest digit fits with the protrusion 49 of the rotor 47 of the switch lever 45, and the switch lever 45 is movable.

This movement turns off the limit switch 52, so the motor 8 stops and the screen 13
is stopped at the lower limit stop position.

In addition, if the counting wheel 29 of the largest upper digit overruns due to the weight inertia of the screen 13 or the winding shaft 2, or an erroneous operation during the setting operation, the vertical The shoulder of the surface 44b pushes the protrusion 49 of the rotor 47, and as shown by the imaginary line in FIG.
The switch lever 45 is not rotated due to sliding contact with the circumferential surface of the switch lever 9. Therefore, the switch lever 45 keeps the limit switch 52 in the OFF state,
The motor 8 is not re-driven.

Further, when the counting wheel 29 is reversed from the above-mentioned overrun position, the protrusions 49 of the rotor 47 are urged toward the counting wheel 29 by the spring 51, so that the recesses 44 are opposed to each other. By doing so, the protrusion 49 of the rotor 47 fits into this recess 44,
The projection 49 can return to its original position.

According to the screen stop position setting mechanism of the above-described embodiment, when the setting operation lever 58 is operated to the regulating part 62a to wind up or unfold the screen 13 and the screen 13 is moved to the desired position, the setting operation lever 58 is moved to the desired position. If you operate the regulating part 62b to confirm that the movement of the screen 13 has stopped, and then operate the setting operation lever 58 to the regulating part 62c, the setting of the stop position is completed, and the setting of the stopping position of the screen 13 is completed. This operation is simple and there is no error in setting the counter 17, so when the screen 13 is used normally, it can be stopped at the set position.

In the above-described embodiment, the operation for setting the unfolding direction of the screen 13, that is, the lower limit stop position, was explained, but the operation for setting the upper limit stop position is also performed by operating the upper limit stop position setting mechanism 14 in the same way as the above operation. Therefore, its explanation will be omitted.

In addition, in the above-described embodiment, when an input gear that turns OFF the input when the counter 17 is reset is inserted in the preceding stage of the counter 17, the planetary gear differential mechanism 16 is simply configured with a spur gear. can do.

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,
The switch corresponds to the return lever 40, the switch corresponds to the limit switch 52, the operating lever corresponds to the setting operating lever 58, and other configurations correspond to the same part names in the embodiment.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a cross-sectional view of 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 left side view of the counting wheel, Fig. 6 is a right side view of the switch lever section, and Fig. 7 a, b, and c are the setting operation lever sections. FIG. 8 is a perspective view of the setting operation lever, and FIG. 9 is a power supply circuit diagram. DESCRIPTION OF SYMBOLS 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... Fixing shaft, 27-29... Counting wheel, 30... Swing shaft, 3
1... Swing frame, 39... Cam, 40... Return lever, 44... Recess, 45... Switch lever, 5
4...Fixing spring, 58...Setting operation lever, 5
9...first operation section, 60...second operation section, 6
1...Third operation section, 62a, 62b, 62c...
...Regulatory Department.

Claims (1)

[Scope of Claims] 1. A motor is provided that winds up or unfolds the screen by controlling the winding shaft around which the screen is wound in forward and reverse directions, and the amount of rotation inputted from the winding shaft is sequentially shifted and counted. In addition to providing a counter with a plurality of counting wheels, this counter is also provided with a return mechanism that returns the counting state of the counter to the set count value set as the stop position of the screen. A switch lever that detects and moves when a numerical value is counted is provided, and a switch that turns off the motor by the movement of the switch lever is provided, and is set to be operated from outside the device. An operating lever is provided, and the setting operating lever is provided with a first operating section for operating the switch OFF and ON via the switch lever, and a second operating section for operating the return mechanism of the counter to return, and these are provided. Each operating section is configured such that after the setting operating lever has completed the operation of the first operating section in which the switch was turned from ON to OFF, the operating state of the second operating section is such that the counter is in the return state. Screen stop position setting mechanism with a time lag in between. 2. Provide a motor that winds up or unfolds the screen by controlling the winding shaft around which the screen is wound in forward and backward directions, and inputs the rotation of the winding shaft to one of the internal gears or carriers of the planetary gear differential mechanism. The sun gear is fixed and rotatable, and the rotation output from the planetary gear differential mechanism is directly input to the counting wheel of the lowest lower digit, and the input rotation amount is outputted from the other side. A counter is provided with multiple counting wheels that sequentially advance and count the numbers.
This counter is equipped with a return mechanism that returns the counting state of the counter to the set count value set as the stop position of the screen. A switch lever is provided opposite to the switch lever, and a switch is provided opposite to the switch lever to turn off the motor by movable the switch lever. , a first operating section for operating the switch OFF and ON via the switch lever, a second operating section for operating the return mechanism of the counter to return, and a third operating section for operating the sun gear to a fixed and rotatable state. An operating section is provided, and each of these operating sections enters the operating state of the second operating section in which the counter returns to the reset state after the operation of the first operating section, in which the setting operating lever operates the switch from ON to OFF, is completed. The screen stop position setting mechanism is arranged with a time lag set between each operating section so that after the operation of the second operating section is completed, the third operating section is operated to fix the sun gear.