JP3404004B2 - Stop position setting mechanism for tubular motor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stop position setting mechanism for a tubular motor used as an opening / closing device for shutters and blinds.

[0002]

2. Description of the Related Art Conventionally, as an opening / closing device for a shutter, a blind, etc., a tubular motor is arranged in a cylindrical winding drum, and the motor rotates the winding drum forward or backward, and the shutter etc. There are those that are wound or unwound. With this type, normally, the stop position (upper limit position and lower limit position) of the shutter etc. is set in advance by the limit switch equipped in the tubular motor, and the power supply circuit of the motor is cut off at the set position to stop the shutter etc. I am trying to let you.

Further, as a stop position setting mechanism using such a limit switch of a tubular motor, for example, as disclosed in Japanese Utility Model Registration No. 2536306, the outer circumference of a limit case provided at the end of the tubular motor is disclosed. A rotatably provided limit gear fitted to the end of the take-up drum, and has a plurality of girders and a carry-up pinion on the inner end side of the limit case, which are rotated by the rotation of the limit gear. It is known that a counter type limit switch is provided with push buttons on the outer circumference of the outer end of the limit case. And
When setting the stop position of the shutter etc., first, by pushing in the push button, the reset arm of the limit switch is rotated in one direction against the urging force of the spring member so as to move between the beam and the pinion. Release the button and return each beam to the original position, and turn on the power supply circuit of the tubular motor with a micro switch or the like.
Next, by operating the tubular motor with the operation switch to wind or unwind the shutter etc. to the desired stop position and then returning the push button to its original position, the limit switch causes the resetting by the biasing force of the spring member. The arm rotates in the opposite direction, the gear wheel and the pinion mesh with each other, and the limit switch function can be exerted.

By the way, it is necessary to keep the push button pressed against the urging force of the spring member of the limit switch during the setting of the stop position of the shutter or the like. In order to do so, a locking means is provided, specifically, a locking piece is formed at the lower end of the push button, and a locking step portion is formed in the limit case, and the locking piece is pushed and rotated to rotate the locking piece. It is proposed that the locking step and the locking step are held and the push button is rotated or reversely rotated from this pressed state to release the locking between the locking piece and the locking step. Have been implemented.

[0005]

However, a winding drum such as a shutter incorporating a tubular motor is usually arranged in a box attached to the upper edge of a doorway of a building and the like. Since the push button of the tubular motor protruding from the end of the drum is also located at a high place and its operation is performed through a small inspection port on the bottom surface of the box, there is a problem that it is not easy to push and rotate the push button.

The present invention has been made in view of the above points, and an object thereof is to set a stop position of a shutter or the like simply by pushing a push button. A motor stop position setting mechanism is provided.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 provides a stop position setting mechanism for a tubular motor, the end of a winding drum driven by the tubular motor on the outer periphery of a limit case. A limit gear that is rotatably provided in the limit case is provided, and a counter type limit switch having a plurality of girder wheels and a carry-up pinion that are rotated by the rotation of the limit gear is provided on the inner end side of the limit case. Pushbuttons are provided on the outer periphery of the outer end of each of the limit switches.When the pushbuttons are pushed in, the reset arm rotates in one direction against the biasing force of the spring member, and the limiter and pinion Release the gaps and return each girder to the home position, and turn on the power supply circuit of the tubular motor while By the urging force of to the spring member to assume be configured to engage a digit wheel and the pinion rotates the reset arm in the opposite direction. Then, the limit case is provided with a button case having a vertical groove on the inner peripheral surface and an annular step portion sandwiching the vertical groove at one end of the vertical groove, while the push button is provided with a button body and a button body of the button body. And a button support that supports the base end. Both the button body and the button support have protrusions on their outer peripheral surfaces, and the protrusions are slidably provided in the button case with the protrusions fitted in the vertical grooves of the button case. In addition, the cam surface is formed along the circumferential direction on the base end surface of the button body, the end surface of the button support on the button body side, and the stepped portion of the button case, respectively. The button support comes out from the vertical groove of the case and the cam surface of the button body contacts the cam surface of the button body or the cam surface of the button case, and the button support rotates around the axis and is held in the pushed state. When the button is pushed further, the button support rotates further around the axis due to the contact between the cam surfaces, and the protrusion fits into the vertical groove of the button case.
Configure so that the button body and button support are restored.

In this structure, when the button body of the push button is pushed in to set the stop position, the protruding portion of the button support comes out from the vertical groove of the button case, and the cam surface of the button support and the cam surface of the button body or the button case. The button support rotates around its axis and is held in the pushed state by contact with the cam surface of the, and when the button body of the push button is pushed further from this state, the button support rotates further around the axis due to the contact between the cam surfaces. Then, since the protruding portion fits into the vertical groove of the button case and the button body and the button support are returned to their original positions, the stop position can be set only by pushing the button body.

The invention according to claim 1 further comprises a reset lever for transmitting the pushing operation force of the push button to the reset arm of the limit switch, the push button side end of the reset lever, and the side face of the reset lever. Along
Thus, the other end of the rod-shaped spring that extends in the longitudinal direction and has one end abutting the button support of the push button is fixed. In this configuration, the button support of the push button is not supported by directly contacting the reset lever, but is supported by a bar-shaped spring, so the button body of the push button is pushed in when the stop position is set, After the button support is rotated around the axis and held in the pushed state, when the button body is pushed further from this state, the spring is not elastically deformed and the pushing is not transmitted to the limit switch side.

According to a second aspect of the present invention, in the stop position setting mechanism for the tubular motor according to the first aspect, a spring is provided between the button case and the button body to hold the pushed state when the button body is pushed. The configuration is With this configuration, even if the push button is positioned so as to project downward from the outer circumference of the outer end of the limit case, when the push button body is pushed in, the push state of the push button body is maintained by the spring, and the push button itself is pushed by its own weight. Since the main body is not returned to its original state, it is possible to easily determine whether the limit switch is in the free operation state or the stop position setting state depending on the state of the button main body.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show the entire configuration of a stop position setting mechanism for a tubular motor for a shutter according to an embodiment of the present invention, in which 1 is a limit case provided at an end of the tubular motor. A limit gear 2 composed of an inner gear that fits into the end of a winding drum (not shown) is rotatably provided on the outer circumference, and the inner end side of the limit case 1 (the end side inserted into the winding drum) ) Is connected to the limit base 3.

A drive shaft 4 extending on the center line of the limit base 3 is rotatably provided, and a drive gear 6 meshing with the limit gear 2 and an idler gear 5 is attached to one end of the drive shaft 4. Has been done. In addition, the limit base 3 has two counter type limit switches 11 and 12 when seen in plan view from the drive shaft 4
Each limit switch 1 is arranged symmetrically across the upper point.
The rotational force of the drive shaft 4 is transmitted to the motors 1 and 12 via a pair of transmission gears 13 and 14, respectively.

The above two limit switches 11 and 12
Correspond to the upper limit position and the lower limit position of the shutter stop position. For example, in the case of the limit switch 11, as shown in FIGS. 4 and 5, transmission is performed on the shaft 21 extending parallel to the drive shaft 4. Four girders 22, 23, which are rotatably supported together with the gear 14,
24, 25, between the transmission gear 14 and the first digit wheel 22, between the first digit wheel 22 and the second digit wheel 23, the second
Four carry pinions, which are respectively interposed between the third digit wheel 23 and the third digit wheel 24 and between the third digit wheel 24 and the fourth highest digit wheel 25. 26, 27, 2
8, 29, a switch arm 31 swingably supported around a shaft 30 extending in the arrangement direction near the beam wheels 22 to 25, and a shaft 32 extending in the arrangement direction near the pinions 26 to 29. A first reset arm 33 that is swingably supported and a micro switch 34 that is arranged below the operating arm portion 31a of the switch arm 31 are provided.

One of the above-mentioned girders 22 to 25 (transmission gear 1
As shown in detail in FIG. 6, gears 22a, 23a, 24a, 25a are formed on the entire circumference of each of the four (4) portions, and the shafts are formed on one side surface of each of the sheaves 22 to 25, respectively. A heart-shaped reset cam (not shown) is formed around the through hole 35 of 21. Further, two gears 22b, 23b, 2 are respectively provided on the other side (opposite side of the transmission gear 14) of each of the first to third digits 22 to 24.
4b is formed, and a concave portion 25c is formed at one location on the outer peripheral surface of the other portion of the highest digit wheel 25. And
The pinion 26 is used for both the transmission gear 14 and the gear 22a of the first-order girder 22, and the pinion 27 is for the second gear 22 of the first-position girder 22.
Both the single gear 22b and the gear 23a of the second-order beam wheel 23, the pinion 28 is a two-piece gear 23b of the second-order beam wheel 23.
And the pinion 2 on both the gear 24a of the third digit 24 and the gear 24a.
9 engages with both the two-gear 24b of the third digit wheel 24 and the gear 25a of the highest digit wheel 25, and the upper digit wheel is rotated every time the lower digit wheel makes one revolution. For example, a carry operation of rotating 1/10 is performed.

The micro switch 34 is a case 34.
The switch button 34b is provided so as to be retractable from the inside of a, and the leaf spring 34c that is disposed across the upper side of the switch button 34b and has one end fixed to the case 34a. The operating arm portion 31a of the switch arm 31 is in contact with the leaf spring 34c, and the switch arm 3
In addition to the actuating arm portion 31a, the reference numeral 1 has a contact protrusion portion 31b which is always in contact with the outer peripheral surface of the highest digit beam 25. In the set state, the micro switch 34 normally operates the operating arm portion 31a of the switch arm 31.
The leaf spring 34c is pressed by the switch button 34b is pushed into the case 34a to bring the power supply circuit of the tubular motor into an ON state, and the contact protrusion 31b is set in the recess 25c of the highest digit 25. At the same time as the operating arm portion 31a of the switch arm 31 is pushed up by the spring reaction force of the leaf spring 34c when fitted, the switching button 3
4b protrudes from the inside of the case 34a to be in an OFF state that shuts off the power supply circuit of the tubular motor.

All of the pinions 26 to 29 are rotatably provided on a shaft 36. The shaft 36 is supported by a second reset arm 37 and at the same time, a first reset arm. It is provided so that it can be engaged with 33. Then, the first reset arm 33
When one is rotated around its shaft 32 in one direction, the second reset arm 37 also rotates about its shaft (not shown), so that each pinion 26-29 separates from the side of the girders 22-25, and The four pressing pieces (not shown) formed on the second reset arm 37 are respectively attached to the columns 22 to 25.
It comes in contact with the reset cam to reset each of the digits wheels 22 to 25 to the origin position. At this time, the switch arm 31 receives a pressing force from the first reset arm 33 and rotates around the shaft 30, and the micro switch 34 is turned on.

On the shaft 32 of the first reset arm 33, the pinions 26 to 29 are attached to the girders 22 to 25.
A coil spring 38 is mounted as a spring member that biases the first reset arm 33 so as to rotate in a direction in which the first reset arm 33 is brought closer to the side and meshes with each other, while resisting the biasing force of the coil spring 38. The reset lever 40 for rotating the first reset arm 33 is the limit base 3
It is swingably supported by.

The reset lever 40 for the limit switch 11 and the one for the limit switch 12 have the same length dimension, and are arranged symmetrically with the drive shaft 4 interposed therebetween in plan view. And one end thereof extends to the outer end side in the limit case 1. Further, as shown in FIG. 7, a pair of push buttons 4 are provided on the outer circumference of the outer end portion of the limit case 1 so as to correspond to the respective limit switches 11 and 12.
1, 41 are provided, and this pair of push buttons 4
The limit switches 11 and 12 respectively corresponding to the positions of the reset lever 40 are changed to the free operation state and the stop position setting state by pushing in the push levers 1 and 41.
Is for transmitting the pushing operation force of the push button 41 to the first reset arm 33 of each of the limit switches 11 and 12.

A push button 41 of the reset lever 40
At the side end , along the side surface of the reset lever 40, the longitudinal direction
A rod-shaped lever spring 42 extending in the direction of the arrow is provided. One end of the lever spring 42 is bent into a loop and abuts the bottom surface of the push button 41, while the other end is fixed to the reset lever 40.

The push button 41 includes a button body 45 protruding outward from the outer peripheral surface of the limit case 1 and a button support 46 for supporting the base end of the button body 45, as shown in detail in FIG. Consists of, button support 4
The bottom surface of 6 is a lever spring 42 on the side of the reset lever 40.
It is elastically supported by. On the other hand, the limit case 1 is provided with a substantially cylindrical button case 47, and the button body 45 of the push button 41 and the button support 46 are both inserted into the button case 47.

As shown in FIG.
As shown in detail in FIG. 11, two long ridges 51, 51 extending over the entire length in the axial direction are formed at diagonal positions with respect to each other, and four long ridges 51 extending from one end in the axial direction to an intermediate portion are formed. The short ridges 52, 52, ... Are formed at substantially equal intervals in the circumferential direction, and the two recesses 53, 53 are on the other end side in the axial direction and at an intermediate position between the long ridges 51, 51. Are formed respectively. And the button case 47 is
The concave portion 53 side portion is provided by being inserted into the insertion hole 48 of the limit case 1 from the inside of the limit case 1 to a position where one end of the short convex strip 52 abuts on the inner surface of the limit case 1.

The inner peripheral surface of the button case 47 is
As shown in FIG. 12, the inner diameter of the intermediate portion is formed as a stepped hole smaller than the inner diameters of both ends, and three vertical grooves 55, 55, 55 are formed on the inner peripheral surface of the intermediate portion, that is, the small diameter portion. Are formed at equal intervals in the circumferential direction, that is, at intervals of 120 degrees, and annular step portions 5 sandwiching the vertical groove 55 at both ends of the vertical groove 55, respectively.
6, 57 are provided. Of the two step portions, the step portion 57 closer to the inner side of the limit case 1 is provided with the adjacent vertical groove 5
A cam surface 58 is formed between 5, 55 along the circumferential direction. Each cam surface 58 has a mountain portion 58a and a valley portion 58b which start from the vertical groove 55, and an inclined surface 58c is provided from the mountain portion 58a to the valley portion 58b.
Further, it has a vertical surface 58d extending in the vertical direction from the valley portion 58b, a mountain portion 58e is provided at the tip of this vertical surface 58d, and an inclined surface 58f descending from this mountain portion 58e toward the vertical groove 55 is provided. ing.

On the other hand, as shown in detail in FIGS. 13 and 14, the button body 45 is rod-shaped having a central hole 61, and the outer peripheral surface thereof has a vertical groove 55 of the button case 47.
Corresponding to, three protrusions 62, 62, 62 are formed at intervals of 120 degrees in the circumferential direction, and in the button body 45, the protrusions 62 are always fitted in the vertical groove 55 of the button case 47. In this state, the button case 47 slides in the axial direction. A cam surface 63 is formed on the base end surface of the button body 45 (the end surface on the opening side of the center hole 61) along the circumferential direction of the center hole 61. The cam surface 63 has several crests 63a and several troughs 63b (six in the figure), and troughs 63b, 6 on both sides of the crest 63a.
Inclined surfaces 63c and 63d are provided to 3b.
Each of the protrusions 62 is located in the circumferential direction of the button body 45 so as to extend from the middle of the inclined surface 63c to the middle of the adjacent inclined surface 63d with the mountain portion 63a interposed therebetween.

As shown in detail in FIGS. 15 to 17, the button support 46 is a rod-shaped member having substantially the same outer diameter dimension as the button body 45, and the bottom surface thereof has a lever spring 42 on the reset lever 40 side. A circular bottom plate portion 65 is formed so as to abut on the outer peripheral surface of the button case 47.
6, 66 are formed at intervals of 120 degrees in the circumferential direction,
The button support 46 is configured to slide in the button case 47 in the axial direction with the protrusion 66 fitted in the vertical groove 55 of the button case 47. On the end surface of the button support 46 on the button body 45 side, a center convex portion 67 that is fitted into the center hole 61 of the button body 45 and is centered is formed at the center portion thereof. A cam surface 68 is formed around the circumference in the circumferential direction. The cam surface 68 is the cam surface 63 of the button body 45.
As in the case of No. 6, each of the ridges 68a and the valleys 68b has several corners (six in the figure), and the ridges 6a on both sides of the ridge 68a are provided.
Inclined surfaces 68c and 68d are provided to 8b and 68b. Each of the protrusions 66 is located in the circumferential direction of the button support 46 so as to coincide with the inclined surface 68d.

Further, as shown in FIG. 8, a button cap 70 that comes into contact with the end surface of the button case 47 is attached to the outer peripheral surface of the limit case 1. As shown in detail in FIGS. 18 and 19, the button cap 70 includes a pair of leg portions 73, 73 provided on a rectangular flat plate portion 72 having a center hole 71 with the center hole 71 interposed therebetween. An engaging portion 74 capable of engaging with the concave portion 53 of the button case 47 is formed at the tip of the portion 73. Then, as described above, the button case 47 is inserted from the inside of the limit case 1 into the insertion hole 48 of the limit case 1, and the push button 41 is inserted into the button case 47, and then the center hole 71 of the button cap 70 is inserted. While inserting the button body 45 of the push button 41, the pair of leg portions 73, 7 of the button cap 70
3 are both inserted into the insertion hole 48 from the outside of the limit case 1, and the engaging portion 74 at the tip of each leg 73 is attached to the button case 47.
By engaging the recess 53 of the button cap 70
The button cap 70 is mounted with the flat plate portion 72 of the button cap 47 in contact with the end surface of the button case 47 and the outer peripheral surface of the limit case 1 around the button case 47.
This prevents the button case 47 from coming off.

Between the inner peripheral surface of the button case 47 and the outer peripheral surface of the button main body 45, a coil spring 75 is seated at one end on the short ridge 52 of the button main body 45 and at the other end on the button cap 70. Are arranged. The coil spring 75 is for holding the pushed state when the button body 45 is pushed, and its spring force is sufficient to push up the button body 45, and the coil springs 38 of the limit switches 11 and 12 have the same spring force. The biasing force (spring force) causes the lever spring 42 to push up the button support 46 via the reset lever 40, and is set to be sufficiently small.

Next, the operation of changing the state of the limit switch 11 or 12 by pushing the push button 41 will be described with reference to FIGS. In these drawings, of the protrusions 66 of the button support 46, the front face of the protrusion is shown by cross hatching, the right side face of the protrusion is shown by right upward hatching, and the left face of the protrusion is shown by right downward hatching. Also, button case 4
7 shows the internal shape in a see-through state, and the two inclined surfaces 68c, 68d of the cam surface 68 of the button support 46 are shown.
One of the inclined surfaces 68c is displayed in black.

Now, as shown in FIG. 20, the limit switch is in the stop position setting state, and the button body 45 of the push button 41 projects from the button case 47, that is, the outer peripheral surface of the limit case 1. At this time, the spring force from the limit switch causes the lever spring 42 to push the button support 46 up to the button case 47 via the reset lever 40. Further, the protruding portion 62 of the button body 45 and the protruding portion 66 of the button support 46 are in the vertical groove 55 of the button case 47. In this state, as shown in the enlarged detail of FIG. Cam surface 6
The crest 68a of the cam surface 68 of the button support 46 hits and stops in the middle of the inclined surface 63c of No. 3 and the crest 63a of the cam surface 63 of the button body 45 and the crest 68a of the cam surface 68 of the button support 46. Are 15 degrees out of phase.

When an external force is applied to the button body 45 from this state and the button support 47 is pushed into the button case 47, the protrusion 66 of the button support 46 exceeds the ridge 58a of the cam surface 58 of the button case 47 and the button case 47. Vertical groove 55
After coming out of the inside (in other words, after descending to the lowest position L1), the inclined surface 63c of the cam surface 63 of the button body 45.
Along the ridge 68a of the cam surface 68 of the button support 46
Is slightly raised while rotating 15 degrees until it reaches the valley portion 63b of the cam surface 63 of the button body 45, and the state shown in FIG. 22 is obtained.

After this, when the external force to the button body 45 is removed, the button support 46 has its projection 66 (specifically, a part of the inclined surface 68d of the cam surface 68 located on the end surface of the projection 66 on the button body side) of the button. Cam surface 5 of case 47
4 along the inclined surface 58c of 8 until it hits the vertical surface 58d
It rises while rotating 5 degrees, and becomes the state shown in FIG. In this state, the button body 45 of the push button 41 is
The limit switch is pushed into the button case 47 more than in the limit switch stop position setting state shown in 0, and this state is the free operation state of the limit switch. In the limit switches 11 and 12, when the button support 46 actually lowers to the lowest descent position L1, the limit switches 11 and 12 enter the free operation state, and the button support 4 moves from the lowest descent position L1.
Even when 6 is raised to the stop position L2 in the free operation state, the free operation state of the limit switch is maintained due to the bending of the lever spring 42.

After the tubular motor is operated by the operation switch in the above-mentioned free operation state to set the shutter to the desired upper limit position or the lower limit position, an external force is applied to the button main body 45 of the push button 41 to further push the button support 46. Of the projection 66 over the ridge 58e of the cam surface 58 of the button case 47, and the cam surface 6 of the button body 45
2 along the inclined surface 63c of the button support 46 until the crest 68a of the cam surface 68 of the button support 46 reaches the trough 63b of the cam surface 63 of the button main body 45 while rotating slightly 15 degrees.
The state shown in FIG.

After that, when the external force on the button body 45 is removed, the protrusion 66 of the button support 46 is rotated up by 45 degrees along the inclined surface 58f of the cam surface 58 of the button case 47, and then raised. Vertical groove 5 of button case 47
5, the lever spring 42 pushes the button support 46 up to the button case 47 via the reset lever 40 by the spring force from the limit switch, thereby returning to the stop switch stop position setting state shown in FIG.

As described above, in the above embodiment, when the limit switches 11 and 12 are switched between the stop position setting state and the free operation state, an external force is simply applied to the button body 45 of the push button 41. Since only push-in operation is performed, switching is performed even when the push button 41 is located at a high place inside the shutter box attached to the upper edge of the entrance and exit of the building and the operation is performed through the small inspection port on the bottom surface of the shutter box. The operation can be performed easily and the workability can be improved.

In addition, even when the tubular motor is attached with the push button 41 protruding downward from the outer peripheral surface of the limit case 1, the button body 45 of the push button 41 is placed in the button case 47 on the limit case 1 side. When pushed, the button body 45 is held in the pushed state by the coil spring 75. Therefore, at a glance of the state of the button body 45, the states of the limit switches 11 and 12 can be easily determined, and the workability is improved. It can be better.

The present invention is not limited to the above embodiment, but includes various other forms.
For example, in the above embodiment, the pushing force of the push button 41 is applied to the limit switch 1 via the reset lever 40.
The case of transmitting to the reset arm 33 of 1 or 12 has been described, but in the present invention, the pushing operation force of the push button is a member different from the reset lever, for example, a cam as disclosed in Japanese Utility Model Registration No. 2536306. The present invention can be similarly applied to a device that is transmitted to a reset arm of a limit switch via a slide member and a slide member.

Further, in the above-described embodiment, the distance between the carry wheels 22 to 25 of the counter type limit switches 11 and 12 and the carry pinions 26 to 29 is increased and the carry wheels 22 to 25 are separated from each other.
As a reset arm for resetting the carriage to the origin position, a second reset arm 37 for swingably supporting the carry pinions 26 to 29 and an operation force from the push button 41 are applied to the second reset arm 37. Although the case of including the first reset arm 33 for transmitting is described, the present invention is of a type in which the operating force of the reset lever is directly transmitted to the reset arm that swingably supports the carry pinion. Of course, the present invention can be applied to a stop position setting mechanism of a tubular motor including various conventionally known counter type limit switches.

[0037]

As described above, according to the stop position setting mechanism of the tubular motor of the present invention, the stop position can be set only by pushing the button body of the push button, which simplifies the setting work. Can be achieved. Moreover, the structure is simple, the implementation can be easily performed, and the effect of excellent practicability is achieved.

Further, since the button support of the push button is supported by the reset lever via the rod-shaped spring, the limit switch side is affected even when the push button body is pushed further from the normal pushing state. This is very effective in implementing it.

In particular , in the invention according to claim 2 , even if the push button is positioned so as to project downward from the outer periphery of the outer end portion of the limit case, when the push button body is pushed in, the spring pushes the push button body. Since the pressed state is maintained and the button body is not returned to its original state by its own weight, the state of the limit switch can be easily discriminated by the button body, and the workability can be further improved.

[Brief description of drawings]

FIG. 1 is a plan view showing an overall configuration of a stop position setting mechanism for a tubular motor for a shutter according to an embodiment of the present invention.

FIG. 2 is a bottom view in which a part is similarly cut out.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB in FIG.

FIG. 5 is a plan view of a counter type limit switch.

FIG. 6 is an exploded perspective view of a carry wheel, a carry pinion and the like of the limit switch.

FIG. 7 is a view seen from the direction C in FIG. 1 with a part incised.

FIG. 8 is an enlarged vertical side view of the vicinity of the push button.

FIG. 9 is a button case of a push button, (a) is a front view and (b) is a side view.

FIG. 10 is a vertical sectional side view of the button case.

11 is a cross-sectional view taken along the line EE of FIG. 9 (a).

FIG. 12 is a diagram showing the shapes of the inner peripheral surface and the cam surface of the button case viewed from different phase directions.

FIG. 13 is a front view of the button body of the push button.

FIG. 14 is a diagram showing the shapes of the outer peripheral surface and the cam surface of the button body viewed from different phase directions.

FIG. 15 is a front view of a button support for a push button.

16 is a cross-sectional view taken along the line FF of FIG.

FIG. 17 is a view showing the shapes of the outer peripheral surface and the cam surface of the button support viewed from different phase directions.

FIG. 18 is a front view of the button cap.

FIG. 19 is a view seen from the direction G in FIG.

FIG. 20 is an explanatory diagram for explaining the operation when the state of the limit switch is changed by pressing the push button.

FIG. 21 is an enlarged view of the vicinity of the cam contact between the button body and the button support of FIG. 20.

22 is the same explanatory diagram as FIG. 20. FIG.

FIG. 23 is also an explanatory diagram.

FIG. 24 is also an explanatory diagram.

[Explanation of symbols]

1 limit case 2 limit gear 11,12 Counter type limit switch 22,23,24,25 Girder 26, 27, 28, 29 Carry pinion 33 First reset arm 34 micro switch 38 Coil spring (spring member) 40 Reset lever 41 push button 42 Lever spring 45 button body 46 button support 47 button case 55 vertical groove 57 steps 58, 63, 68 Cam surface 62, 66 protrusion 70 button cap 75 coil spring

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E06B 9/00 H01H 13/00

Claims (2)

(57) [Claims] 1. A limit gear is rotatably provided on the outer periphery of a limit case to be fitted into an end of a winding drum driven by a tubular motor, and an inner end of the limit case receives rotation of the limit gear. A counter type limit switch having a plurality of rotating carriages and a carry-up pinion is provided with pushbuttons on the outer periphery of the outer end portion of the limit case.The limit switch has a reset arm when the pushbuttons are pushed. Rotates in one direction against the urging force of the spring member to separate the girder wheel and the pinion and return each girder wheel to the original position, and to bring the power supply circuit of the tubular motor into a conductive state. When the push button is returned to its original position, the reset arm is rotated in the opposite direction by the urging force of the spring member so that the gear wheel and the pinion mesh with each other. In the stop position setting mechanism of the tubular motor, the limit case is provided with a button case having a vertical groove on the inner peripheral surface and an annular step portion sandwiching the vertical groove at one end of the vertical groove. The push button includes a button main body and a button support that supports a base end of the button main body. Both the button main body and the button support have a protrusion on the outer peripheral surface, and the protrusion is formed on the button case. It is slidably installed in the button case while it is fitted in the vertical groove.The base end face of the button body, the button body side end face of the button support, and the step part of the button case are each along the circumferential direction. The cam surface is formed, and when the button body is pushed in, the protruding part of the button support comes out from the vertical groove of the button case, and the cam surface of the button support and the cam surface of the button body While the button support rotates around its axis and is held in the pushed state due to contact with the cam surface of the button case, when the button body is pushed further from this state, the button support rotates further around the axis due to the contact between the cam surfaces. Then, the protruding part is fitted into the vertical groove of the button case so that the button body and the button support are returned to their original positions. Furthermore, the reset operation for transmitting the pushing operation force of the push button to the reset arm of the limit switch. comprising a lever, a push button end of the reset lever, Lise
A stop position setting mechanism for a tubular motor, wherein a rod-shaped spring, which extends in the longitudinal direction along the side surface of the push lever and has one end abutting the button support of the push button, is fixed at the other end. 2. Between the button case and the button body
Holds the pushed state when pushing the button body
The stop position setting mechanism for a tubular motor according to claim 1, wherein a spring is arranged .