JP5577195B2 - Limit switch for range setting - Google Patents

Description

  The present invention relates to a range setting limit switch for setting upper and lower positions of a shutter or the like.

  As this type of range setting limit switch, a pair of counters composed of a plurality of digit wheels rotating in reverse with each other is provided, and both counters are provided with specific value return means for simultaneously returning all the numeric wheels to a specific value. In addition, there is one in which a signal is transmitted from the highest digit wheel after the total digits of both counters are lowered (see, for example, Patent Document 1).

  In the one described in Patent Document 1, the shutter is lowered while holding the state in which the number wheel of the counter is returned to the specific value by the specific value return means of one counter, and specified when the shutter is positioned at the lower limit. Release the return operation by the value return means. In this state, the number wheel of one counter displays a specific value, that is, “999”, and the lower limit position of the shutter is set by this one counter.

  Next, the shutter is raised while maintaining the state in which the number wheel of the counter is returned to the specific value by the specific value return means of the other counter, and when the shutter is at the upper limit, the return operation by the specific value return means is canceled. . In this state, the number wheel of the other counter displays a specific value, that is, “999”, and the upper limit position of the shutter is set by the other counter.

  Therefore, when the motor is driven and the shutter is lowered, one counter is subtracted from an arbitrary value, and when the total digit is reduced from "000" to "999", a drive stop signal is sent from one counter to the motor. Then, the shutter stops at the lower limit position. On the other hand, when the motor is driven and the shutter is raised, the other counter is subtracted from an arbitrary value, and when the total digit is reduced from "000" to "999", a drive stop signal is sent from the other counter to the motor. Then, the shutter stops at the upper limit position.

Japanese Patent No. 3125589

  In the conventional range setting limit switch as described above, two reset shafts for operating the specific value return means provided in each counter are provided for each specific value return means. For this reason, when setting the upper limit position and the lower limit position of the shutter, the operator not only needs to select the reset shaft to be operated, but also because the rotation operation directions of the reset shaft are opposite to each other, There was a problem that operation mistakes due to mistakes were likely to occur.

  The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a range setting limit switch with improved operability and reduced operational errors.

  In order to achieve this object, the present invention includes a pair of counters composed of a plurality of digit wheels that rotate in reverse to each other, and a specific value return means for returning all of the number wheels simultaneously to a specific value in both counters. In the range setting limit switch for setting the range by both counters, a signal is sent from the highest digit wheel when both counters reach the specific value by lowering the total digits. The counters are arranged side by side in a direction perpendicular to the axial direction so that the upper and lower sides and the left and right sides are symmetrical with each other along the axial direction of the numeral wheel, and are supported to be swingable so as to face each other of the counters. A pair of specific value return mediating members that move the specific value return means by swinging to simultaneously return the numeral wheel to the specific value, and a specific value return mediation member A reset pin that is separately oscillated is provided and is rotatably supported, and a setting lever that rotates the reset shaft. The reset pin is in one direction of the reset shaft. Only the specific value return mediating member of one of the counters is swung by one of the reset pins, and the other of the reset shaft is rotated in another direction opposite to the one direction. Only the specific value return mediating member of the other counter is swung by the reset pin.

  The present invention, in the above invention, comprising a switch lever that fits into a recess provided in the digit wheel of the highest digit by displaying a specific value by the digit wheel, and turns off the limit switch by fitting, The specific value return mediating member regulates the fitting of the switch lever to the recess in a state where all the number wheels are simultaneously reset to the specific value by the specific value return means.

The present invention, in any one invention of the invention, the range set by the counters, the upper limit position and lower limit position of the shutter, the reset shaft settings lever to the upwardly rotation center The upper limit position is set by the pivoting operation, and the lower limit position is set by the downward pivoting operation of the setting lever about the reset shaft.

  According to the present invention, the range can be set by rotating one reset shaft in opposite directions without requiring two reset shafts as in the prior art, so that the operability is improved. At the same time, operational errors are reduced.

  According to one of the inventions described above, since the signal is not transmitted when the range is set, the range setting value and the specific value for transmitting the signal coincide with each other. A range can be set.

  According to one of the above inventions, the upper limit position of the shutter is set by rotating the setting lever upward, and the lower limit position of the shutter is set by rotating the setting lever downward. The setting direction of the lower limit position on the shutter coincides with the rotation operation direction of the setting lever. For this reason, in setting the upper and lower limit positions of the shutter, operation errors caused by the setting lever are reduced.

In the range setting limit switch according to the present invention, the upper limit of the shutter is set. FIG. 4A is a side view and FIG. 4B is I (B) -I (B) in FIG. It is line sectional drawing. In the range setting limit switch according to the present invention, the reset pin is positioned at a neutral position, and the state in which the raising and lowering of the shutter is counted by a counter is shown. FIG. 4 (A) is a side view and FIG. It is I (B) -I (B) line sectional drawing. In the range setting limit switch according to the present invention, the lower limit of the shutter is set. FIG. 4A is a side view and FIG. 4B is I (B) -I (B) in FIG. It is line sectional drawing. It is IV arrow line view in FIG. 1 (A). It is a V arrow directional view in Drawing 1 (A). FIG. 5 is a circuit diagram for setting an upper limit and a lower limit of a shutter when the range setting limit switch according to the present invention is opened and closed. It is a front view which shows the state which attached the limit switch for range setting concerning this invention to the manual shutter. It is a front view which shows the state which fixed the range setting limit switch which concerns on this invention to the fixed pipe, and is partially broken. FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG. 8 for explaining a drive system for stepping the number wheel of both counters in the range setting limit switch according to the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  A range setting limit switch generally indicated by reference numeral 1 in FIG. 1 includes a frame 2, first and second counters 3A and 3B supported by the frame 2, and the first and second counters 3A and 3B. And a setting lever 5 that individually resets each to a specific value.

  The frame 2 includes a pair of side plates 10 and 11 formed in a disc shape, and these both side plates 10 and 11 are opposed to each other via a stator 12 as shown in FIGS. As shown in FIG. 1, loose insertion holes 10a and 11a into which a manual shutter center mounting shaft 72, which will be described later, is loosely inserted, are provided at the central portions of 10 and 11, respectively.

  Since both the first and second counters 3A and 3B have the same structure, only the first counter 3A will be described in detail here, and the second counter 3B will be described as necessary.

  As shown in FIG. 5, the first counter 3A has three digit wheels integrally formed with heart cams 15a, 16a, and 17a on the side surfaces, that is, hundreds of recesses 15b provided at predetermined positions on the peripheral surface. A digit wheel 15, a tenth digit wheel 16, and a first digit wheel 17 are mounted on a shaft 18 that is horizontally mounted between a side plate 10 of the frame 2 and a subframe 20 that protrudes integrally with the frame 2. Together with the feed gear 19A, it is rotatably supported on the same axis.

  The peripheral surfaces of these number wheels 15 to 17 are not given numbers like a normal counter, but the decimal system is adopted, and when the number wheel of the lower digit advances 10 steps by the carry pinion 25 described later. The high-order digit wheel is configured to advance one step. Hereinafter, for convenience of explanation, it is assumed that the same numbers as those of a normal counter are attached to the peripheral surfaces of the number wheels 15 to 17.

  As shown in FIGS. 4 and 5, the first and second counters 3 </ b> A and 3 </ b> B are symmetrical with each other in the vertical and horizontal directions along the axial direction (arrow A-B direction) of the shaft 18 of the number wheel 15 to 17. So as to be attached to the frame 2 in a state of being juxtaposed in a direction orthogonal to the axial direction (arrow CD direction).

  That is, as shown in FIG. 1, the first and second counters 3A and 3B are arranged around the loose insertion holes 10a and 11a of the frame 2 with a phase difference of 90 ° in the circumferential direction. The feed gears 19A and 19B of the counters 3A and 3B are positioned on the same circle R1 with the loose insertion holes 10a and 11a as the center as shown in FIG.

  Therefore, as shown in FIG. 5, in the first counter 3A, the feed gear 19A is provided in the arrow A direction (frame 10 side), and the hundreds digit wheel 15 is provided in the arrow B direction (frame 11 side). Yes. On the other hand, in the second counter 3B, as shown in FIG. 4, the feed gear 19B is provided in the arrow B direction (frame 11 side), and the hundreds digit wheel 15 is provided in the arrow A direction (frame 10 side). Yes.

  Further, the first and second counters 3A and 3B are accommodated between the outer peripheral end 2a of the frame 2 and the outer peripheral ends of the loose insertion holes 10a and 11a in a side view as shown in FIG. It is positioned as follows.

  In FIG. 1B, 22A and 22B are first and second return brackets provided in the first and second counters 3A and 3B, respectively, and press the heart cams 15a, 16a and 17a. The three heart cam pressing pieces 23 are integrally formed, and are swingably supported between the side plates 10 and 11 of the frame 2 with the small shaft 24 as the swing center.

  A carry pinion 25 is a coil spring (not shown) that is pivotally supported by a pinion shaft 26 that is supported on both sides of the return bracket 22 by projecting both ends thereof and is mounted on a small shaft 24. ) Is normally meshed with the segment gears and feed gears 19A and 19B integrally formed on the side surfaces of the number wheels 15 to 17.

  In such a configuration, when rotation from the internal gear 76 is transmitted to the feed gears 19A and 19B via intermediate gears 81A and 81B, which will be described later, every tenth digit wheel 17 is rotated every tenth digit. The number wheel 16 is advanced by one step through the carry pinion 25, and the hundredth digit wheel 15 is sequentially advanced by one step through the carry pinion 25 for each rotation of the tenth digit wheel 16.

  In FIG. 1, 30A and 30B are first and second limit switches each having an operating rod 30a, which are provided corresponding to the first and second counters 3A and 3B described above. The first and second limit switches 30A and 30B are both fixed to one side plate 10 as shown in FIGS.

  In FIGS. 1, 4 and 5, 35A and 35B are first and second switch levers provided in the first and second counters 3A and 3B, respectively. The switches 30A and 30B are activated.

  The first and second switch levers 35A and 35B have the same structure except that operating parts 38A and 38B described later are provided on one side plate 10 side.

  That is, the first switch lever 35A is swingably supported between the both side plates 10 and 11 of the frame 2 via the shaft 36 as shown in FIGS. The lever portion 37A that comes into contact with the peripheral surface 15, the operating portion 38A that operates the operating rod 30a of the first limit switch 30A, and the engaging portion 40a of the first specific value return mediating member 40A described later are engaged. The engagement portion 39A is formed with an engagement protrusion 39a. A fitting projection 37a that fits into the recess 15b of the hundreds digit wheel 15 is provided at the swinging end of the lever portion 37A.

  The first switch lever 35A is urged counterclockwise in FIG. 1 by the torsional moment of a coil spring (not shown) wound around the shaft 36 with the shaft 36 as a rotation center.

  On the other hand, as shown in FIGS. 1 and 4, the second switch lever 35B is swingably supported between both side plates 10 and 11 of the frame 2 via a shaft 36. The lever portion 37B that abuts on the peripheral surface 15, the operating portion 38B that operates the operating rod 30a of the second limit switch 30B, and the engaging portion 40a of the second specific value return mediating member 40B described later are engaged. The engagement portion 39B is formed with an engagement protrusion 39a. A fitting projection 37a that fits into the recess 15b of the hundreds digit wheel 15 is provided at the swing end of the lever portion 37B.

  The second switch lever 35B is urged clockwise in FIG. 1 about the shaft 36 by a torsional moment of a coil spring (not shown) wound around the shaft 36.

  In this state, when the hundreds digit wheel 15 of the first counter 3A displays a value other than “9”, the fitting protrusion 37a of the lever portion 37A of the first switch lever 35A is shown in FIG. The first limit switch 30A of the first limit switch 30A is actuated by the actuating portion 38A as shown in FIG. 30A is turned on.

  Similarly, when the hundreds digit wheel 15 of the second counter 3B indicates other than “9”, the fitting protrusion 37a of the lever portion 37B of the second switch lever 35B is shown in FIG. The second limit switch 30B is brought into contact with the peripheral surface of the hundred digit wheel 15 as shown in FIG. 2, and the actuating rod 30a of the second limit switch 30B is actuated by the actuating portion 38B as shown in FIG. Is turned on.

  On the other hand, when the hundreds digit wheel 15 of the first counter 3A displays “9”, as shown in FIG. 1B, the fitting projection 37a is fitted into the recess 15b, and the first switch lever 35A is moved. Since the shaft 36 rotates in the counterclockwise direction in the drawing, the operation of the operating rod 30a of the first limit switch 30A by the operating portion 38A is released, and the first limit switch 30A is operated as shown in FIG. The limit switch 30A is turned off.

  Similarly, when the hundreds digit wheel 15 of the second counter 3B displays “9”, as shown in FIG. 3 (B), the fitting projection 37a is fitted into the recess 15b, and the second switch lever 35B. Since the shaft 36 rotates in the clockwise direction in the drawing, the operation of the operating rod 30a of the second limit switch 30B by the operating portion 38B is released, and as shown in FIG. The limit switch 30B is turned off.

  In FIGS. 1, 4, and 5, 40A and 40B are first and second specific value return mediating members provided in the first and second counters 3A and 3B, respectively. The first and second return brackets 22A and 22B of the second counters 3A and 3B are swung to return the first and second counters 3A and 3B to the specific value “999”. Both the first and second specific value return mediating members 40A and 40B have the same structure.

  That is, the first specific value return mediating member 40A is swingably supported between the side plates 10 and 11 of the frame 2 via the shaft 41 as shown in FIG. 5, and as shown in FIG. The engaging portion 40a that engages with the engaged protrusion 39a of one switch lever 35A, the engaging groove 40b that engages with the end portion of the pinion shaft 26, and a first reset pin 50A that will be described later are engaged. Engaged portion 40c is provided.

  The first specific value return mediating member 40A is urged clockwise in FIG. 1 about the shaft 41 by a torsional moment of a coil spring (not shown) wound around the shaft 41.

  In this state, as shown in FIG. 1A, the engaging portion 40a is engaged with the engaged protrusion 39a of the first switch lever 35A, and the engaging portion 40a is engaged as shown in FIG. The mating groove 40b is engaged with the pinion shaft 26.

  From this state, as will be described later, the first reset pin 50A shown in FIG. 3A is engaged with the engaged portion 40c of the first specific value return mediating member 40A, and the reset shaft 46 is further axially centered. When rotated about the clockwise direction in the figure, the first specific value return mediating member 40A rotates counterclockwise about the shaft 41 as a rotation center.

  By this rotation, the engaging portion 40a of the first specific value return mediating member 40A is engaged with the engaged protrusion 39a of the first switch lever 35A, and the first switch lever is engaged via the engaged portion 39. 35A rotates clockwise about the shaft 36 as a rotation center.

  Therefore, the operating rod 30a of the first limit switch 30A is operated by the operating portion 38 of the first switch lever 35A, and the first limit switch 30A is forcibly turned on.

  At the same time, the first specific value return mediating member 40A rotates counterclockwise about the shaft 41 as a rotation center, thereby engaging the first specific value return mediating member 40A as shown in FIG. The groove 40b engages with the pinion shaft 26, and the first return bracket 22A rotates clockwise about the small shaft 24 as a rotation center.

  By this rotation, the meshing of the carry pinion 25 with the segment gears of the number wheels 15 to 17 and the feed gear 19A is released, and the heart cam pressing piece 23 presses the heart cams 15a, 16a, 17a, so that the first Counter 3A returns to the specific value “999”. Therefore, the pinion shaft 26, the first return bracket 22A, the heart cam pressing piece 23, and the heart cams 15a, 16a, and 17a constitute a specific value return means.

  On the other hand, the second specific value return mediating member 40B is swingably supported between the side plates 10 and 11 of the frame 2 via the shaft 41 as shown in FIG. The engaging portion 40a that engages with the engaged protrusion 39a of the second switch lever 35B, the engaging groove 40b that engages with the end portion of the pinion shaft 26, and the second reset pin 50B that will be described later are engaged. Engaged portion 40c is provided.

  The second specific value return mediating member 40B is urged counterclockwise in the drawing with the shaft 41 as a rotation center by a torsional moment of a coil spring (not shown) wound around the shaft 41.

  In this state, the engaging portion 40a is engaged with the engaged protrusion 39a of the second switch lever 35B as shown in FIG. 3A, and the engaging portion 40a is engaged as shown in FIG. The mating groove 40b is engaged with the pinion shaft 26.

  From this state, as will be described later, as shown in FIG. 1A, the second reset pin 50B is engaged with the engaged portion 40c of the second specific value return mediating member 40B, and the reset shaft 46 is further moved. When rotated about the axis in the counterclockwise direction in the figure, the second specific value return mediating member 40B rotates clockwise about the shaft 41 as a rotation center.

  By this rotation, the engaging portion 40a of the second specific value return mediating member 40B is engaged with the engaged protrusion 39a of the second switch lever 35B, and the second switch lever is engaged via the engaged portion 39. 35B rotates counterclockwise about the shaft 36 as a rotation center.

  Therefore, the operating rod 30a of the second limit switch 30B is operated by the operating portion 38 of the second switch lever 35B, and the second limit switch 30B is forcibly turned on.

  At the same time, the second specific value return mediating member 40B rotates clockwise about the shaft 41 as a rotation center, so that the engagement groove of the second specific value return mediating member 40B as shown in FIG. 40b engages with the pinion shaft 26, and the second return bracket 22B rotates counterclockwise about the small shaft 24 as a rotation center.

  By this rotation, the meshing of the carry pinion 25 with the segment gears of the number wheels 15 to 17 and the feed gear 19B is released, and the heart cam pressing piece 23 presses the heart cams 15a, 16a, 17a, so that the second Counter 3B returns to the specific value “999”. Therefore, the pinion shaft 26, the second return bracket 22B, the heart cam pressing piece 23, and the heart cams 15a, 16a, and 17a constitute specific value return means.

  As shown in FIG. 1A, the first and second counters 3A and 3B configured as described above do not protrude outward from the outer peripheral end 2a of the frame 2, and the outer peripheral ends of the loose insertion holes 10a and 11a. And the outer peripheral end 2 a of the frame 2.

  4 and 5, 46 is a reset shaft that is rotatably supported between the side plates 10 and 11 of the frame 2 and extends in the axial direction of the shaft 18 of the number wheel 15, 16, and 17. Thus, one end portion protrudes to the outside of the side plate 11 to form a protruding portion 46a.

  As shown in FIG. 1A, the reset shaft 46 is provided between the first counter 3A and the second counter 3B in the circumferential direction of the frame 2 around the loose insertion holes 10a and 11a. It has been. Therefore, the reset shaft 46 is not positioned above or below the first and second counters.

  Further, the base end portion of the setting lever 5 is pivotally attached to the end portion of the projecting portion 46a of the reset shaft 46. By operating the rotating end portion 5a of the setting lever 5 with a finger or the like, FIG. In FIG. 1, the reset shaft 46 is configured to rotate clockwise or counterclockwise in the drawing around the axis.

  As shown in FIGS. 4 and 5, the portion of the reset shaft 46 that is close to the side plate 11 and inside the frame 2 is engaged with the first specific value return mediating member 40 </ b> A of the first counter 3 </ b> A. A first reset pin 50A that engages with the portion 40c is implanted.

  Further, the second shaft that is engaged with the engaged portion 40c of the second specific value return mediating member 40B of the second counter 3B is located in the vicinity of the side plate 10 of the reset shaft 46 and inside the frame 2. The reset pin 50B is implanted. The first and second reset pins 50A and 50B are provided so as to project in substantially opposite directions.

  In such a configuration, as shown in FIG. 3, when the setting lever 5 is rotated clockwise, the reset shaft 46 is rotated clockwise, whereby the end of the first reset pin 50 </ b> A is the first end. The counter 3A is engaged with the engaged portion 40c of the first specific value return mediating member 40A, and the end of the second reset pin 50B is the second specific value return mediating member 40B of the second counter 3B. It is separated from the engaged portion 40c.

  Therefore, by further rotating the setting lever 5 clockwise from this state, only the first specific value return mediating member 40A of the first counter 3A rotates counterclockwise around the shaft 41 as the rotation center. Then, as described above, the first counter 3A returns to the specific value “999” and the first limit switch 30A is forcibly turned on.

  In this way, the first reset pin 50A engages only with the engaged portion 40c of the first specific value return mediating member 40A of the first counter 3A, and only the first specific value return mediating member 40A is shaken. And the second reset pin 50B is separated from the engaged portion 40c of the second specific value return mediating member 40B of the second counter 3B and does not swing the second specific value return mediating member 40B. Hereinafter, the positions of the first and second reset pins 50A and 50B are referred to as first positions.

  On the other hand, as shown in FIG. 1, when the setting lever 5 is turned counterclockwise, the reset shaft 46 is turned counterclockwise, so that the end of the second reset pin 50B becomes the second counter. The second specific value return mediating member 40B of 3B is engaged with the engaged portion 40c, and the end of the first reset pin 50A is covered by the first specific value return mediating member 40A of the first counter 3A. It separates from the engaging part 40c.

  Accordingly, by further rotating the setting lever 5 counterclockwise from this state, only the second specific value return mediating member 40B of the second counter 3B rotates clockwise about the shaft 41 as the rotation center. Then, as described above, the second counter 3B returns to the specific value “999” and the second limit switch 30B is forcibly turned on.

  In this manner, the second reset pin 50B engages only with the engaged portion 40c of the second specific value return mediating member 40B of the second counter 3B, and only the second specific value return mediating member 40B is shaken. And the first reset pin 50A is separated from the engaged portion 40c of the first specific value return mediating member 40A of the first counter 3A and does not swing the first specific value return mediating member 40A. The positions of the first and second reset pins 50A and 50B are hereinafter referred to as second positions.

  Further, by rotating the setting lever 5, the first reset pin 50A is engaged with the engaged portion 40c of the first specific value return mediating member 40A of the first counter 3A as shown in FIG. The positions of the first and second reset pins 50A and 50B where the second reset pin 50B engages with the engaged portion 40c of the second specific value return mediating member 40B of the second counter 3B, that is, the above-mentioned The positions of the reset pins 50A and 50B that do not swing the first and second specific value return mediating members 40A and 40B between the first position and the second position are hereinafter referred to as neutral positions.

  In FIG. 6, 60 is an AC motor that can switch between forward and reverse driving and raises and lowers a shutter 77 to be described later, 61 is a motor changeover switch that raises and lowers the shutter 77 by switching forward and reverse driving of the AC motor 60, and 62 AC 100 V power source connected to the AC motor 60 and the motor changeover switch 61.

  The first limit switch 30 </ b> A described above is interposed between the “lower” terminals of the AC motor 60 and the motor changeover switch 61. The second limit switch 30 </ b> B described above is interposed between the “upper” terminals of the AC motor 60 and the motor changeover switch 61.

  Next, a case where the range setting limit switch 1 configured in this way is applied to a manual shutter will be described mainly with reference to FIGS. In FIG. 7, reference numerals 70 and 70 denote frames constituting the entrance of the garage. The frames 70 and 70 are erected from the ground toward the ceiling of the entrance of the garage so as to face each other. Manual shutter frames 71 and 71 are attached to face each other.

  Reference numeral 72 denotes a central mounting shaft that is cantilevered and supported on the upper portion of one frame 70, and one end of a torsion spring 73 wound around the central mounting shaft 72 is fixed to the peripheral surface of the central mounting shaft 72. Has been.

  The other end of the torsion spring 73 is fixed to a rotating member (none of which is shown) having the center mounting shaft 72 as the center of rotation and the upper end of the shutter fixed. Therefore, when the shutter is raised manually, the shutter is wound around the rotating member, and when the shutter is lowered manually, the shutter is unwound from the rotating member.

  In FIG. 8, reference numeral 75 denotes a fixed pipe having a range setting limit switch 1 attached therein, and the garage so that the center mounting shaft 72 is loosely inserted into the loose insertion holes 10 a and 11 a of the range setting limit switch 1. As shown in FIG. 9, a pair of windows 75a and 75a facing intermediate gears 81A and 81B, which will be described later, are provided at portions that are 90 ° out of phase in the circumferential direction as shown in FIG. Yes.

  The range setting limit switch 1 fixed to the frame 70 through the fixed pipe 75 in this way is positioned so that the direction of the arrow EF coincides with the top-to-bottom direction in FIG.

  76 is a winding pipe formed in a cylindrical shape, and is rotatably supported on the outer periphery of the fixed pipe 75. The winding pipe 76 is rotated clockwise or counterclockwise in FIG. 9 by an AC motor 60 (see FIG. 6). To do.

  One end portion 77 a of the shutter 77 attached to the center attachment shaft 72 is attached to a part of the outer periphery of the winding pipe 76. Therefore, when the motor changeover switch 61 is switched to the “upper” terminal in FIG. 6 and the AC motor 60 is started, the winding pipe 76 rotates counterclockwise in the drawing.

  The shutter 77 is wound around the winding pipe 76 by the rotation of the winding pipe 76 in the counterclockwise direction, and the entrance of the garage is opened when the shutter 77 is wound up. On the other hand, when the motor changeover switch 61 is switched to the “lower” terminal and the AC motor 60 is activated, the winding pipe 76 rotates in the clockwise direction in the figure, the shutter 77 is unwound from the winding pipe 76, and the shutter 77 is moved. The entrance of the garage is closed by the shutter 77 by descending.

  9, 78 is a rotation transmission pipe formed in a cylindrical shape, and as shown in FIG. 8, an internal gear 78a is formed on one end side, and a bearing portion 78b is formed on the other end side. A bearing portion 78 b is fitted and fixed to one end portion of the winding pipe 76. The rotation transmission pipe 78 and the take-up pipe 76 are rotatably supported by the fixed pipe 75 so as to be concentric with the center mounting shaft 72. Therefore, the rotation transmission pipe 78 rotates integrally with the take-up pipe 76 around the fixed pipe 75 via the bearing portion 78b.

  9, 82A and 82B are transmission shafts rotatably supported between both side plates 10 and 11 of the frame 2, and as shown in FIGS. 4 and 5, the outer sides of the side plates 11 of these transmission shafts 82A and 82B. The transmission gears 80A and 80B meshing with the internal gear 78a of the rotation transmission pipe 78 are axially attached to the projecting portion.

  These transmission gears 80A and 80B are positioned on the same circle R2 around the loose insertion holes 10a and 11a as shown in FIG. The circle R2 and the internal gear 78a of the rotation transmission pipe 78 are positioned on concentric circles centering on the loose insertion holes 10a and 11a.

  As shown in FIG. 5, an intermediate gear 81 </ b> A that meshes with the feed gear 19 </ b> A is attached to a portion of the transmission shaft 82 </ b> A adjacent to the side plate 10. As shown in FIG. 4, an intermediate gear 81B that meshes with the feed gear 19B is axially attached to a portion of the transmission shaft 82B adjacent to the side plate 11.

  With this configuration, when the motor changeover switch 61 is switched to the “up” terminal, the AC motor 60 is activated and the shutter 77 is wound up, the winding pipe 76 rotates counterclockwise in FIG.

  Accordingly, when the internal gear 78a of the rotation transmission pipe 78 rotates integrally counterclockwise in FIG. 9, the transmission gears 80A and 80B rotate counterclockwise, so that the feed gears 19A and 19B rotate clockwise. Rotate. By the clockwise rotation of the feed gears 19A and 19B, the first counter 3A adds and the second counter 3B subtracts.

  On the other hand, when the motor changeover switch 61 is switched to the “lower” terminal and the AC motor 60 is activated, the shutter 77 is unwound from the take-up pipe 76, and the take-up pipe 76 rotates in the clockwise direction in FIG.

  Accordingly, when the internal gear 78a of the rotation transmission pipe 78 rotates integrally in the clockwise direction in FIG. 9, the transmission gears 80A and 80B rotate in the clockwise direction, so that the feed gears 19A and 19B rotate in the counterclockwise direction. To do. As the feed gears 19A and 19B rotate counterclockwise, the first counter 3A subtracts and the second counter 3B adds.

  As described above, since the both side plates 10 and 11 of the range setting limit switch 1 are provided with the loose insertion holes 10a and 11a for loosely inserting the central mounting shaft 72 necessary for the manual shutter, the central mounting shaft 72 is attached. Since the range setting limit switch 1 can be mounted, the operation of switching from the manual shutter to the electric shutter becomes easy.

  In addition, since the first and second counters 3A and 3B are arranged in the circumferential direction around the loose insertion holes 10a and 11a, the range is within a space formed in a donut shape around the center mounting shaft 72. The setting limit switch 1 can be accommodated.

  Further, as described above, as shown in FIG. 1A, the reset shaft 46 includes the first counter 3A and the second counter 3B in the circumferential direction of the frame 2 around the loose insertion holes 10a and 11a. The reset shaft 46 is not located above or below the first and second counters. Therefore, the interval H between the outer peripheral end 2a of the frame 2 and the outer peripheral ends of the loose insertion holes 10a and 11a can be formed to a minimum. For this reason, it becomes possible to accommodate the shutter open / close limit switch 1 in a limited space around the center mounting shaft 72.

  Next, an operation for setting the upper limit and the lower limit of the shutter 77 using the range setting limit switch 1 having such a configuration will be described with reference to FIGS. 1 to 3 and Table 1. FIG.

  First, in order to set the lower limit position of the shutter 77, the motor changeover switch 61 is operated to switch to the “lower” terminal so that the shutter 77 is lowered. At the same time, the setting lever 5 is operated to rotate the reset shaft 46 clockwise around the axis as shown in FIG. 3, and after the first reset pin 50A is positioned at the first position, the reset shaft 46 is further moved. Is rotated clockwise around the axis.

  By this rotation, the first specific value return mediating member 40A of the first counter 3A is rotated counterclockwise around the shaft 41 as the rotation center, so that the first return bracket 22A is small as described above. The first counter 3A returns to the specific value “999” by rotating clockwise about the shaft 24 as a rotation center.

  At the same time, since the first switch lever 35A rotates clockwise around the shaft 36, the first limit switch 10A is forcibly turned on, the AC motor 60 is activated, and the shutter 77 is lowered. To do.

  During this time, the first counter 3A is driven in the subtraction direction, but since the setting lever 5 continues to operate, the first counter 3A remains “999”. When the lowering shutter 77 is positioned at the lower limit, the turning operation of the setting lever 5 is released, and the first reset pin 50A is positioned at the neutral position.

  At this time, the first counter 3A remains “999”, and the fitting projection 37a of the switch lever 35 is fitted into the recess 15b of the hundreds digit wheel 15 so that the first limit switch 10A is turned off. Then, the AC motor 60 stops. During this time, the second counter 3B is added to an arbitrary numerical value.

  Thus, in order to set the lower limit position of the shutter 77, as shown in FIG. 3, the setting lever 5 is rotated clockwise around the reset shaft 46, that is, the setting lever 5 is moved downward. I try to operate it.

  For this reason, the setting direction of the lower limit position of the shutter 77 coincides with the rotation operation direction of the setting lever 5, so that an operation error by the setting lever 5 is reduced when setting the lower limit position of the shutter 77.

  Next, in order to set the upper limit position of the shutter 77, the motor changeover switch 61 is operated to switch to the “up” terminal so as to raise the shutter 77. At the same time, the setting lever 5 is operated to rotate the reset shaft 46 counterclockwise around the axis as shown in FIG. 1, and after the second reset pin 50B is positioned at the second position, the reset is further reset. The shaft 46 is rotated counterclockwise around the axis.

  By this rotation, the second specific value return mediating member 40B of the second counter 3B is rotated clockwise around the shaft 41, so that the second return bracket 22B is a small shaft as described above. The second counter 3B returns to the specific value “999” by rotating counterclockwise about the rotation center 24.

  At the same time, since the second switch lever 35B rotates counterclockwise around the shaft 36, the second limit switch 30B is forcibly turned on, the AC motor 60 is activated, and the shutter 77 is To rise.

  During this time, the second counter 3B is driven in the subtraction direction, but since the setting lever 5 continues to operate, the second counter 3B remains “999”. When the ascending shutter 77 is located at the upper limit, the turning operation of the setting lever 5 is released.

  At this time, the second counter 3B remains “999”, and the fitting protrusion 37a of the second switch lever 35B is fitted into the recess 15b of the hundreds digit wheel 15, so that the second limit switch 30B is turned OFF and the AC motor 60 stops. During this time, the first counter 3A is added to a numerical value corresponding to the rise of the shutter 77, which is “050” in this embodiment.

  Thus, in order to set the upper limit position of the shutter 77, as shown in FIG. 1, the setting lever 5 is rotated counterclockwise around the reset shaft 46, that is, the setting lever 5 is directed upward. To operate.

  For this reason, when the setting direction of the upper limit position of the shutter 77 coincides with the rotation operation direction of the setting lever 5, an operation error caused by the setting lever 5 is reduced in setting the upper limit position of the shutter 77.

  Next, the control operation of the shutter 77 after the upper and lower limits of the shutter 77 are set in the first and second counters 3A and 3B will be described. For example, when the shutter 77 is positioned at the upper limit, the first counter 3A displays “050” and the first limit switch 10A is in the ON state.

  When the motor changeover switch 61 is switched to the “lower” terminal, the AC motor 60 is activated and the shutter 77 starts to descend. When the lower limit position is reached, the first limit switch 10A becomes “999”, and the first limit switch 10A is turned OFF, the AC motor 60 stops, and the shutter 77 stops at the set lower limit position.

  Here, since the shutter 77 stops at the same display “999” as “999” set as the lower limit position by the first counter 3A described above, the accuracy of the stop position becomes the same as the set position. That is, the shutter 77 stops at the same position as the lower limit position set by the first counter 3A.

  Therefore, no inadvertent gap is generated between the lower end of the shutter 77 and the ground, and the AC motor 60 is not driven even after the lower end of the shutter 77 contacts the ground. Therefore, no unnecessary load is applied to the AC motor 60 or the like. At this time, the second counter 3B is “050”, and the second limit switch 30B is in the ON state.

  Next, to raise the shutter 77 from the lower limit position to the upper limit position, the motor changeover switch 61 is switched to the “upper” terminal. When the AC motor 60 is activated, the shutter 77 is raised, and at the same time, the second counter 3B subtracts from “050”.

  When the shutter 77 reaches the upper limit position, the second counter 3B becomes “999”, the second limit switch 30B is turned OFF, the AC motor 60 stops, and the shutter 77 stops at the set upper limit position.

  Here, the shutter 77 stops at “999”, which is the same as “999” set as the upper limit position by the second counter 3B, similarly to the stop at the lower limit position described above. It will be the same. That is, the shutter 77 stops at the same position as the upper limit position set by the second counter 3B.

  Therefore, the upper end of the shutter 77 does not reach the garage ceiling and the garage cannot be opened, and the AC motor 60 is driven even after the upper end of the shutter 77 reaches the garage ceiling. Therefore, no unnecessary load is applied to the AC motor 60 or the like.

  In this way, by rotating one reset shaft 46 with one setting lever 5 without requiring two reset shafts as in the prior art, each of the counters 3A and 3B is set to a specific value. By returning, it is not necessary to select the reset shaft when setting the upper limit position and the lower limit position of the shutter 77. In addition, the operability is improved because the specific value can be set only by rotating one setting lever 5 clockwise or counterclockwise.

  Further, in order to step the first counter 3A and the second counter 3B in the opposite directions, the first and second counters 3A and 3B are moved along the axial direction of the number wheels 15, 16, and 17, respectively. Since the upper and lower sides and the left and right sides are arranged in parallel with each other, the first and second counters 3A and 3B can use the same counter. For this reason, it is not necessary to develop a counter having a new structure, so that the development cost can be reduced and an inexpensive range setting limit switch can be provided.

  Further, in order to advance the first and second counters 3A and 3B in the opposite directions, the first and second counters 3A and 3B are moved up and down along the axial direction of the number wheels 15, 16, and 17, respectively. The two transmission gears 80A and 80B are simultaneously rotated by one internal gear 78a so that the left and right are symmetrical with each other, and the first transmission gear 80A and 80B are used to rotate the first transmission gear 80A and 80B. The feed gears 19A and 19B of the first and second counters 3A and 3B are stepped up.

  This eliminates the need for a gear train for stepping the first and second counters 3A and 3B in opposite directions, simplifies the structure, and reduces the number of parts. Further, since the internal gear 78a and the transmission gears 80A and 80B are employed, the space can be used effectively, so that the size can be reduced.

  In the present embodiment, numbers are not added to the peripheral surface of the number wheel, but numbers may be displayed like a counter that has been widely known in the past. Further, although the specific value is “999”, the counter may be in decimal notation, the specific value may be “888”, or in short, the specific value may be a value when the total digits are reduced. In the present embodiment, the example in which the opening / closing of the shutter 77 is controlled by the range setting limit switch 1 is described. However, the present invention is not limited to this, and the operation range of other industrial equipment is set. May be.

  DESCRIPTION OF SYMBOLS 1 ... Range setting limit switch, 2 ... Frame, 3A ... 1st counter, 3B ... 2nd counter, 5 ... Setting lever, 10, 11 ... Side plate, 15 ... Hundred digit number wheel, 15a, 16a, 17a ... heart cam, 22A ... first return bracket, 22B ... second return bracket, 23 ... heart cam pressing piece, 25 ... carry pinion, 26 ... pinion shaft, 30A ... first limit switch, 30B ... second limit Switch, 35A ... 1st switch lever, 35B ... 2nd switch lever, 37a ... Fitting protrusion, 38 ... Actuating part, 39a ... Engagement protrusion, 40A ... 1st specific value return mediation member, 40B ... 1st 2 specific value return mediating member, 40a ... engaging portion, 40b ... engaging groove, 40c ... engaged portion, 46 ... reset shaft, 50A ... first reset pin, 50B ... first Reset pin, 60 ... AC motor, 61 ... motor changeover switch, 72 ... central mounting shaft, 76 ... winding pipe, 77 ... shutter, 78a ... outer gear, 80A, 80B ... transmission gear.

Claims (3)

Provided with a pair of counters consisting of a multi-digit number wheel that rotates in reverse to each other, provided both counters with specific value return means for simultaneously returning all the number wheels to a specific value, and these counters carry down the total digits In the range setting limit switch that sends a signal from the highest-order digit wheel when the specific value is reached, and sets the range by both counters,
The pair of counters are arranged side by side in a direction orthogonal to the axial direction so that the vertical and horizontal directions are symmetrical with each other along the axial direction of the numeral wheel.
A pair of specific value return mediating members that are swingably supported by the two counters so as to face each other and swing to move the specific value return means to simultaneously return the number wheel to a specific value; ,
One reset shaft provided with two reset pins for individually swinging the specific value return mediating member and rotatably supported around the axis;
With
The reset pin pivots the reset shaft in one direction, and only the specific value return mediating member of one of the counters is swung by one of the reset pins, and is opposite to the one direction of the reset shaft. A range setting limit switch characterized in that, by a rotation operation in the other direction, only the specific value return mediating member of the other counter is swung by the other reset pin. It is equipped with a switch lever that fits into the recess provided on the highest digit digit wheel by displaying a specific value, and turns the limit switch off by fitting.
2. The specific value return mediating member regulates the fitting of the switch lever to the concave portion in a state where all the number wheels are simultaneously reset to a specific value by the specific value return means. Limit switch for setting range as described. The range set by both counters is the upper limit position and lower limit position of the shutter,
The upper limit position is set by turning operation of the reset shaft settings lever to the upwardly rotation center, the lower limit position by the rotational operation of downward that a rotation around the reset shaft of the setting lever The range setting limit switch according to claim 1, wherein: is set.

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