JP3125589B2 - Range setting limit switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a range setting limit switch for setting upper and lower positions of a shutter or the like.

[0002]

2. Description of the Related Art As this kind of range setting limit switch, there is one proposed in Japanese Patent Publication No. Sho 63-17997. The device proposed here includes a winding body on which the shutter curtain is wound, and a pair of counter-type limit switches that rotate in opposite directions in association with the rotation of the winding body. The switches are returned to zero in accordance with the upper and lower limit positions of the shutter, respectively, and the display of each limit switch is “000”.
When it becomes "0", a control signal is transmitted to the motor for driving the shutter.

[0003]

However, in the above-described conventional range setting limit switch, a gear train is provided between the take-up body and both counter type limit switches in order to rotate the pair of counter type limit switches in opposite directions. Therefore, there is a problem that not only the number of parts is increased but also miniaturization is hindered. In addition, since the push button for returning the counter to zero protrudes from the counter, there has been a problem that compactness is hindered.

Accordingly, the present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a range setting limit switch which reduces the number of parts and reduces the size.

[0005]

In order to achieve the above object, a range setting limit switch according to the present invention includes a counter composed of a pair of plural-digit numerals wheels rotating in opposite directions to each other. A specific value return means for simultaneously returning the vehicle to a specific value is provided, and a signal is transmitted from the highest digit vehicle after the total carry down of these two counters, and a range setting limit switch for setting the range by both counters. A pair of counters are arranged side by side so as to be symmetrical in the vertical and horizontal directions along the axial direction of the numeral wheel, and one rotatable drive shaft for driving both counters to rotate in the reverse direction; Two reset shafts extending in the axial direction of the numeral wheel for individually driving the respective specific value return means and being rotatable around the axis are provided. It is. In the range setting limit switch according to the present invention, a feed gear concentric with the numeral wheel is provided below the numeral wheel, and a transmission gear meshing with the feed gear is fitted to the drive shaft.

[0006]

According to the present invention, the same counter can be used, and the two counters rotate counter to each other with one drive shaft. Further, according to the present invention, it is possible to directly drive a feed gear concentric with the numeral wheel. Further, according to the present invention, the reset shaft and the drive shaft can be arranged along the longitudinal direction of the counter.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 to 8 show a range setting limit switch according to the present invention. FIG. 1 is an exploded perspective view of the whole, FIG. 2 is a plan view, FIG. 3 is a front view, FIG. FIG. 6 is a cross-sectional view taken along the line VV in FIG. 2, FIG. 6 is a cross-sectional view taken along the line VI in FIG. 2, and FIG.
FIG. 3 is a circuit configuration diagram adopted in a shutter opening / closing mechanism.

In these figures, a range setting limit switch generally indicated by reference numeral 1 is composed of a main body frame 2, a counter section 3 including a pair of first counter 4 and second counter 5, a drive shaft section 6, and a reset shaft. And these parts can be disassembled and assembled as a single unit. The main body frame 2 includes a pair of disk-shaped side plates 10, 10 and both side plates 10, 10.
, A connecting plate 12, 12 connecting the side plates 10, 10 and a bottom plate 13. A pair of fitting grooves 14 are formed in the center of the upper edges of the side plates 10 and 10, and two pairs of fitting grooves 15 are formed in the lower edges thereof. Reference numeral 16 denotes a notch formed in the center of the upper edge of the partition plate 11, reference numeral 17 denotes a hole formed in the bottom plate 13, and reference numeral 18 (see FIG. 3) denotes a bearing formed on the back surface of the bottom plate 13.

The first and second counters 4 and 5 are comprised of a numeral wheel section 20 and a control section 21.
Have the same structure.
Only the configuration will be described. Numeral car part 20 includes
Three numeral wheels each having a heart cam 21b, 22b, 23b formed on the side surface, that is, a hundred digit numeral wheel 21, a tens digit numeral wheel 22, and a first digit whose concave portion 21a is recessed at a predetermined peripheral surface position. A digit wheel 23 is rotatably supported coaxially with a feed gear 24 on a shaft 25 laid between both side plates of a frame 26. These number cars 2
The numerals 1 to 23 are not provided with numerals like a normal counter. However, the decimal system is adopted, and when the lower digit numeral wheel advances by 10 by the carry pinion 33 described later, the upper digit is increased. The numeral-shaped wheel is configured to advance by one step, and for convenience of explanation, the following description will be made on the assumption that numerals similar to those of a normal counter are attached to the peripheral surfaces of the numeral wheels 21 to 23.

Reference numeral 28 denotes a return bracket, which is integrally formed with three heart cam pressing pieces 29 for pressing the heart cams 21b, 22b, 23b, and has pins 30 projecting from both side surfaces.
Is fitted to a U-shaped bearing portion 32 integrally formed on the bottom surface portion of the frame 26 to be swingably supported by the bearing portion 32. Numeral 33 denotes a carry pinion, which is rotatably supported by a pinion shaft 34 which has both ends protruding from both side surfaces of a return bracket 28 and is horizontally mounted thereon, and which is returned by a coil spring 31 mounted on a pin 30.
8 is urged to oscillate, so that the carry pinion 33
Meshes with the segment gear and the feed gear 24 on the side surfaces of the normal numeral wheels 21, 22, and 23, and when rotation is transmitted from the outside to the feed gear 24, every one rotation of the single digit numeral wheel 23,
The tens digit wheel 22 is carried one step forward via the carry pinion 33.

Reference numeral 36 denotes a frame having a U-shaped cross section. A hole 36a screwed to the bottom portion 13 of the main body frame 2 with a screw 35 and a screw for screwing the frame 26 to attach the numeral wheel portion 20 to the frame 36. A hole 36b is formed, and a rectangular hole 36c is formed.
37 is a shaft 3 laid on both sides of the frame 36
8, a switch lever which is swingably supported by the center wheel 8 and has a curved lever portion 37a which comes into contact with the peripheral surface of the hundreds digit numeral wheel 21;
An operating portion 37b for operating the operating rod 47a of the micro switch 47, and an engaging protrusion 37c protruding from the other end are provided. Normally, as shown in FIG. 6A, the lever portion 37a comes into contact with the peripheral surface of the hundreds digit numeral wheel 21 and the operating portion 37
b, the operating rod 47a of the micro switch 47 is in the ON state, and when the hundreds digit wheel 21 displays "9", the concave portion 21a is moved to the lever portion 37 as shown in FIG.
a, the operating lever 47a is released from the operating portion 37b because the lever portion 37a fits into the concave portion 21a.
The state becomes the F state. A second microswitch 48 having the same configuration as the first microswitch 47 is also provided in the second counter 5. A return drive bracket 40 is swingably supported by a shaft 45 laid on both side surfaces of the frame 36. The return drive bracket 40 is provided with a pair of opposing arms 42, and the arm 42 is provided with the pinion shaft 34. Are formed at both ends of the groove.

At one end of the return drive bracket 40, a driven lever 41 is provided so as to project therefrom.
1, an engagement portion 41a is provided to be engaged with an engagement protrusion 37c of the switch lever 37. 44 is a dowel 41b of the driven lever 41, one end of which is inserted into the shaft 45.
The other end is a coil spring that is hung on the cut-and-raised piece 46 of the frame 36 to give the return drive bracket 40 a rotational behavior. 5A, the return drive bracket 40 is provided with a rotation behavior in the direction A about the shaft 45 in FIG. 5A, and one engagement surface 43a of the concave portion 43 of the return drive bracket 40 is connected to the pinion shaft. 34, the return bracket 28
Is imparted with a rotating behavior in the clockwise direction (A direction) about the shaft 30. With this configuration, even when the carry pinion 33 receives an external impact or the like, the carry pinion 33 is prevented from being detached from the numeral wheel 21 and character shift and the like are prevented. On the other hand, in a specific value return operation described later, the other engagement surface 43b of the concave portion 43 is engaged with the pinion shaft 34.

One end of a drive shaft 50 constituting the drive shaft portion 6 is provided with a drive gear 5 to which rotation transmission from the outside, for example, rotation of a rotating body interlocked with opening and closing of a shutter is transmitted.
1 and a pair of transmission gears 52, 5 meshing with the respective feed gears 24 of the counters 4, 5.
3 is fitted, and the drive shaft 50 is
, The counters 4 and 5 are driven in common by being rotationally driven from the outside via.

The reset shaft portion 7 is provided with a pair of a first reset shaft 8 and a second reset shaft 9, and one ends 8a, 9a of the reset shafts 8, 9 are formed in a D-cut shape. On the other end side, reset levers 55, 5 are provided with engaging projections 55a, 56a which abut against the driven lever 41 of the return drive bracket 40 of each of the first and second counters 4, 5.
6 is fitted. 57 is a reset shaft 8, 9
One end of the coil spring is fitted to the reset levers 55 and 56, and the other end of the coil spring is fitted to the back surface of the bottom portion 13 of the main body frame 2. The first and second reset shafts 8, 9 are fixed at one ends 8a, 9a with a lever or the like, not shown, in a direction orthogonal to the reset shafts 8, 9, and by pulling these levers individually, It turns around the axis, and simultaneously resets the numerical wheels 21 to 23 described below to a specific value.

Next, a method of assembling the range setting limit switch having such a configuration will be described. First, body frame 2
Two counters 4 with a partition plate 11 on the bottom surface 13 of the
2, as shown in FIG. 2, the partition plate 11 is interposed along the shaft 25 of the numeral wheel so that the upper, lower, left and right sides are symmetrical to each other. The two fitting grooves 14, 14 are fixed to the frame with screws 35 so as to match the line gg connecting the two fitting grooves 14, 14. Thereafter, the drive shaft 50 is fitted into the fitting groove 14 and fixed. At this time, the transmission gears 52 and 53 mesh with the feed gears 24 and 24 of the counters 4 and 5, since the line gg coincides with the center line of the counters 4 and 5. When the drive gear 51 rotates in the forward direction, the counter 4
Of the counter 5 rotates in the reverse direction, while the feed gear 24 of the counter 5 rotates in the reverse direction, so that the counters 4 and 5 rotate in the opposite directions. In this manner, the counters 4 and 5 are rotated in the opposite direction by rotating the one drive shaft 50 and through the pair of transmission gears 24, so that the number of parts is reduced and The structure can be simplified and the size can be reduced.

Next, a coil spring 57 is inserted into the reset shafts 8 and 9, and one end of the coil spring 57 is hung on the reset levers 55 and 56. The reset shafts 8 and 9 are rotatably supported on the back surface of the bottom portion 13 by fitting the other end into the fitting groove 15. Reset lever 5 of supported reset shafts 8, 9
5 and 56 penetrate the hole 17 of the main body frame 2 and the hole 36c of the frame 36 of the counter and face the inside of the counters 4 and 5, and as shown in FIG.
6) The dowels 55a and (56a) engage with the driven lever 41 of the return drive bracket 40.

In such a configuration, when the reset shaft 8 is rotated, the dowel 55a swings in the direction B as shown in FIG.
5, the other engaging surface 43b of the concave portion 43 of the arm portion 42 presses the pinion shaft 34, and the return bracket 28 is rotated about the shaft 30. Since the pressing piece 29 is rotated in the counterclockwise direction (D direction), the heart cams 21b to 23b
Is pressed to simultaneously reset the numeral wheels 21 to 23 to a specific value. In the present embodiment, this specific value is set to a value after the total carry, which is obtained by subtracting one digit from all the digits, that is, “999” obtained by subtracting one digit from “000”. When this specific value return operation is performed, the engaging portion 41a of the driven lever 41 rotates in the E direction and engages with the engaging protrusion 37c of the switch lever 37, as shown in FIG. 37 is forcibly rotated in the counterclockwise direction (F direction) about the shaft 38, the concave portion 21a is located in the lever portion 37a of the switch lever 37 during the specific value return operation. Part 3
7a does not fit into the recess 21a, so that the operating rod 47a of the micro switch 47 does not turn off.

FIG. 8 is a circuit diagram for setting the upper and lower limits of the range setting limit switch 1 when the shutter is opened and closed. In FIG.
Is an AC motor that can switch between forward and reverse rotation, 61 is a motor switch that switches the forward and reverse rotation of the AC motor 60 to raise and lower a shutter (not shown), and 62 is an AC motor 60 and a motor switch. AC1 connected to 61
00V power supply. The first micro switch 47 is A
The second microswitch 48 is connected between the C motor 60 and the “down” terminal of the motor changeover switch 61, and between the AC motor 60 and the “up” terminal of the motor changeover switch 61.
Each is interposed.

Next, the operation of setting the upper and lower limits of the shutter using the range setting limit switch 1 having such a configuration will be described mainly with reference to FIG.

[0020]

[Table 1]

First, in order to set the lower limit position of the shutter, the user operates the motor changeover switch 61 to switch to the “down” terminal so as to lower the shutter, and at the same time, rotates the first reset shaft 8 to rotate the shutter. The numeral wheel of the first counter 4 is returned to a specific value, that is, “999”. At this time, as shown in FIG. 7, the switch lever 37, in which the engagement protrusion 37c is engaged by the engagement portion 41a of the return drive bracket 40 rotated by the dowel 55a, rotates in the F direction. The micro switch 47 is forcibly turned on by the operating portion 37b of the switch lever 37, the AC motor 60 is activated, and the shutter is lowered. During this time, the first counter 4 is driven in the subtraction direction, but since the first reset shaft 8 is continuously operated to rotate,
The first counter 4 remains “999”. And
When the descending shutter is located at the lower limit, the turning operation of the first reset shaft 8 is released. At this time, the first counter 4 still displays "999", and the lever portion 37a of the switch lever 37 is fitted into the concave portion 21a as shown in FIG. 4
7 is turned off, and the AC motor 60 stops. During this time, the second counter 5 is incremented and displays an arbitrary numerical value.

Next, in order to set the upper limit position of the shutter, the motor changeover switch 61 is operated to switch to the "up" terminal so as to raise the shutter, and at the same time, the second reset shaft 9 is rotated to operate. , The numerical wheel of the second counter 5 is returned to a specific value, that is, “999”. At this time, the second microswitch 48 is forcibly turned on by the operating portion 37b of the switch lever 37, as in the case of setting the lower limit position described above, so that the AC motor 60 is activated and the shutter is raised. During this time, the second counter 5
Is driven in the subtraction direction, but the second reset shaft 9
, The second counter 5 indicates “9”.
99 ". When the ascending shutter is positioned at the upper limit, the rotation operation of the second reset shaft 9 is released. At this time, the second counter 5 still displays “999”, and the lever portion 3 of the switch lever 37
7a fits into the recess 21a as shown in FIG. 6 (b), so that the second macro switch 48 is turned off and AC
The motor 60 stops. During this time, the first counter 4 is incremented and displays a numerical value corresponding to the rise of the shutter, in this embodiment, “050”.

Next, the control operation of the shutter after the upper and lower limits of the shutter are set in the counters 4 and 5 will be described. When the shutter is located at the upper limit, the first counter displays "050" and the first micro switch 47 is in the ON state. When the motor changeover switch 61 is switched to the “down” terminal, the AC motor 60 is activated and the shutter starts to lower. When the shutter reaches the lower limit position, the display of the first counter 4 becomes “999” and the first micro switch 47 is turned off, the AC motor 60 stops, and the shutter stops at the set lower limit position. Here, the shutter stops at "999" with the same display as "999" set to the lower limit position by the first counter 4 described above, so that the accuracy of the stop position is the same as the set position, and the shutter is accurate. Can be controlled, so that
The reaction of stopping the shutter becomes accurate, and no unnecessary load is applied to the AC motor 60 or the like. At this time,
The second counter 5 displays "050", and the second microswitch 48 is in the ON state.

Next, to raise the shutter from the lower limit position to the upper limit position, the motor changeover switch 61 is switched to the "up" terminal. The AC motor 60 starts and the shutter moves up, and at the same time, the display of the second counter 5 is subtracted from “050”. When the shutter reaches the upper limit position, the display of the second counter 5 becomes "999", the second micro switch 48 is turned off, the AC motor 60 stops, and the shutter stops at the set upper limit position. Here, the shutter is moved to the second position similarly to the stop at the lower limit position described above.
Since the display is stopped at "999" with the same display as "999" set at the upper limit position by the counter 5, the accuracy of the stop position is the same as the set position.

In this embodiment, the numeral wheels 21 to 23
However, it is a matter of course that a numeral display may be performed like a conventionally known counter.

[0026]

As described above, according to the present invention, there is provided a counter comprising a pair of plural-digit numeral wheels which rotate in opposite directions to each other, and these two counters simultaneously return each numeral wheel to a specific value. A return means is provided, and a signal is sent from the highest-order digit wheel after total decrementing of these two counters, and in a range setting limit switch for setting the range by both counters, the pair of counters are set in the axial direction of the numeral wheel. Are arranged side by side so as to be vertically symmetrical with respect to each other, and both counters are driven in reverse rotation
By providing a rotatable drive shaft, the same counter can be used, and there is no need to develop a counter with a new structure, so development costs can be reduced and the range setting limit switch is inexpensive. Can be provided. Further, since a gear train for driving the numeral wheels to rotate in opposite directions is not required, the size can be reduced.

Further, according to the present invention, a feed gear concentric with the numeral wheel is provided below the numeral wheel, and a transmission gear meshing with the feed gear is fitted to the drive shaft, so that the drive gear is directly connected to the feed gear. Since rotation is transmitted, a worm and a worm wheel, which are drive gears conventionally required below the feed gear, are not required, so that the number of parts can be reduced and the size can be reduced.

Further, according to the present invention, two drive shafts are provided which are rotatably operated around the axis for individually driving the respective specific value return means of both counters. Since the push button member does not protrude, compactness can be achieved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a range setting limit switch according to the present invention.

FIG. 2 is a plan view of a range setting limit switch according to the present invention.

FIG. 3 is a front view of a range setting limit switch according to the present invention.

FIG. 4 is an exploded perspective view of a counter in the range setting limit switch according to the present invention.

FIG. 5 is a sectional view taken along line VV of FIG. 2;

FIG. 6 is a view taken in the direction of an arrow VI showing a relationship between a hundred-digit numeral wheel and a switch lever in FIG. 2;

FIG. 7 is a sectional view taken along line VII-VII of FIG. 2;

FIG. 8 is a circuit configuration diagram in which a range setting limit switch according to the present invention is used for opening and closing a shutter.

[Explanation of Signs] 1. Range setting limit switch, 2. Body frame, 3
.., Counter section, 4 first counter, 5 second counter, 6 drive shaft section, 7 reset shaft section, 8
... First reset shaft, 9 ... Second reset shaft, 14, 15 ... Fit groove, 21 ... Hundredth digit wheel, 21a
... recess, 21b ... heart cam, 24 ... feed gear, 28 ...
Return bracket, 29: Heart cam pressing piece, 33: Carry pinion, 34: Pinion shaft, 36: Frame, 37: Switch lever, 37a: Lever part, 37b
... Actuating part, 37c engaging projection, 40 return drive bracket, 41 driven lever, 41a engaging part, 43 recess, 44 coil spring, 47 first micro switch, 48 second Micro switch, 50: drive shaft, 51: drive shaft, 52: first transmission gear,
53 ... second transmission gear, 55 ... first reset lever,
56 ... second reset lever, 60 ... AC motor, 61
... Motor changeover switch, 62 ... Power supply.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 19/18 E06B 9/88 G06M 3/02

Claims (2)

(57) [Claims] 1. A counter comprising a pair of plural-digit numerals wheels rotating in opposite directions to each other, a specific value return means for simultaneously returning each numeral wheel to a specific value. In the range setting limit switch for sending a signal from the highest digit digit wheel after digit decrement and setting the range by both counters, the pair of counters are vertically and horizontally symmetrical with each other along the axial direction of the digit wheel. A rotatable drive shaft that is arranged side by side and drives both counters to rotate in the reverse direction ,
The specific value return means of both counters are individually driven.
It extends in the axial direction of the set number wheel and is freely rotatable around the axis
A range setting limit switch comprising two reset shafts . 2. The range setting limit switch according to claim 1, wherein a feed gear concentric with the numeral wheel is provided below the numeral wheel, and a transmission gear meshing with the feed gear is fitted to the drive shaft. A range setting limit switch characterized by the following.