JPH0843128A - Rotation angle detector - Google Patents

Abstract

PURPOSE:To detect the rotation angle using alternating binary number. CONSTITUTION:A drive gear 9, a driven gear 8, and a plurality of encoding members 5, each having a bit detection end 11, are arranged in parallel on a main shaft 4 whereas a pinion gear 20 to be meshed with the drive gear 9 and the driven gear 8 is arranged on a subshaft 18. At least one of the drive gear 9 or the pinion gear 20 employs a toothless structure. Rotation of an input shaft 3 is transmitted sequentially and intermittently to the encoding members 5 and the rotational position of the bit end detection end 11, rotating integrally therewith, is detected by means of a photoelectric sensor 14 thus obtaining a digital output of alternating binary number.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation angle detecting device for digitally detecting the absolute value of the rotation angle position of various machines mainly by mechanical means.

[0002]

2. Description of the Related Art Conventionally, various methods such as an optical method using an encode plate and a magnetic method using magnetic force are known as a device for digitally detecting the absolute value of a rotation angle position. In addition, as a method of detecting the absolute position, there are known an integration method that is obtained by integrating the rotational movement amount and an absolute position detection method that detects the rotation angle position itself. It should be noted that there has been almost no proposal of a device that digitally detects the rotational angle position with an alternating binary number with a simple structure.

[0003]

In the method of detecting the absolute position by the integration method, since it is necessary to integrate the rotational movement amount from the origin, once the measurement is started, the measurement is returned to the origin once and the measurement is performed from there. The trouble of starting
Further, when the rotational movement amount is erroneously detected, there is a problem that the error is also integrated.

The absolute position detection method does not require a return to the origin, but its structure is generally complicated and expensive, and a fine structure and processing are required to miniaturize the device. There is a problem. This problem becomes more prominent in the case of increasing the resolution, and it is difficult to construct the device with a practical size and cost.

Further, in the conventional absolute position detecting type rotation angle detecting device, at a given rotation angle position, the so-called reset for setting the output at the start of detection to a desired value or to zero is due to its structure. Have difficulty. Further, when the rotation angle detection device is attached to the machine, a set point or a zero point is set in advance and fixedly used, or an electric calculation circuit is separately prepared externally to perform pseudo setting or reset. Has been.

It is an object of the present invention to provide an absolute position detecting type rotation angle detecting device having a practical size and structure and capable of obtaining a high resolution by an alternating binary number.

[0007]

To achieve the above object, a rotation angle detecting device according to the present invention comprises a plurality of code members having a drive gear and a driven gear arranged in parallel with a main shaft, and a driven gear of the code member. To the drive gear of the adjacent code member is meshed via a pinion gear arranged on a counter shaft provided in parallel with the main shaft, and the rotation angle mechanically input from the outside is the rotation of the code member. In order to be transmitted to the higher-order code member, the drive gear or at least one gear of the pinion gear is a toothless gear at a proper position to cause the adjacent higher-order code member to pass through its driven gear. Each of the code members is intermittently rotated, and a detection end that represents a 1-bit signal is provided on each of the code members, and a sensor that detects the rotational position of the detection end is provided. Characterized in that it has a mechanism for outputting the rotation angle as a digital signal on the basis of the rotational position alternating binary of said detection end.

[0008]

In the rotation angle detecting device having the above-mentioned structure, a plurality of code members are arranged in parallel with the main shaft, the rotation angle inputted from the outside is transmitted to the code members, and the upper code members are intermittently arranged. By rotating, the detection end of the code member and the sensor,
The rotation angle is digitally detected by an alternating binary number based on the rotation position of the code member.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. FIG. 1 is a block diagram of the first embodiment. A rotation angle transmitting gear 2 is provided on one side plate 1a of a frame 1 made of a metal plate, and the rotation angle transmitting gear 2 is provided on the frame 1.
An input shaft 3 for transmitting a rotation angle to be detected from the outside is connected. A main shaft 4 is supported between the side plate 1b on the other side of the frame 1 and the rotation angle transmitting gear 2 and is coaxially supported by the input shaft 3. The main shaft 4 has four code members 5a. 5d are inserted in parallel. In these code members 5a to 5d, a gear portion 10 in which a driven gear 8 and a drive gear 9 are integrated is provided on one side of a cylindrical portion 7 having a through hole 6 for inserting the main shaft 4 as shown in FIG. Cam-shaped bit detecting ends 11 are provided at the center of the cylindrical portion 7, respectively.

Code member 5a other than the last-stage code member 5d
As shown in FIG. 3, the bit detection end 11 provided in each of .about.5c is composed of a 180.degree. Light-shielding portion 12 and a 180.degree. Cutout portion 13, and the final code member 5d is shown in FIG. As described above, two 90-degree light-shielding portions 12 and two 90-degree cutout portions 13 are alternately formed. Further, the photoelectric sensor 14 is arranged close to these bit detection ends 11,
The photoelectric sensor 14 outputs 1-bit signals of "0" and "1" corresponding to the light-shielding portion 12 and the cutout portion 13 of the bit detecting end 11, respectively.

Further, the driven gear 8 is, for example, a full-toothed gear having 16 teeth as shown in FIG. 5, and the drive gear 9 is formed with 4 teeth at 90 ° intervals as shown in FIG. It is assumed that the tooth-missing gear has a ridge, and the peak portions 15a to 15d of the tooth-missing gear
Is formed so as to project from the side surface 16 of the drive gear 9 of the gear portion 10. Further, the valleys 17a and 17b between the crests 15a and 15b and the crests 15c and 15d of the drive gear 9 are made lower than the drive gear side surface 16 of the gear part 10,
The valley portion 17c between b and 15c has the same height as the side surface 16 of the drive gear 9.

On the other hand, a sub shaft 18 is supported by side plates 1a, 1b on both sides of the frame 1 in parallel with the main shaft 4, and the sub shaft 18 transmits the rotation of the rotation angle transmitting gear 2 to the code member 5a. The connecting gear 19 and the three pinion gears 20 that transmit the rotation between the code members 5 are inserted. FIG. 7 is a perspective view of the pinion gear 20. The pinion gear 20 is formed with a through hole 21 through which the counter shaft 18 is inserted. The outer periphery of the through hole 21 is a long peak portion 22 in the axial direction and a short peak portion in the axial direction. 23 are formed alternately.

The peak portions 22 and 23 of the pinion gear 20 are meshed with the drive gear 9 of the code member 5 as shown in FIG.
In this state, the crest portion 23 is arranged on the toothless portion of the drive gear 9, and the tooth surface of the long crest portion 22 is in contact with the outer peripheral surface of the gear portion 10. Here, when the gear unit 10 rotates 1/4 counterclockwise in the arrow direction, the rotation of the pinion gear 20 is restricted because the tooth surface and the outer peripheral surface of the gear unit 10 are in contact with each other, and the gear unit 10
Is not transmitted to the pinion gear 20. Further, when the gear portion 10 rotates 1/4 counterclockwise in the direction of the arrow to engage the crest portion 15a of the drive gear 9 and the short crest portion 23 of the pinion gear 20, the long crest portion 22 becomes the trough portion 17a of the drive gear 9. And the rotation of the gear unit 10 is transmitted to the pinion gear 20.

In such a configuration, when the rotation angle to be measured by the external mechanical rotary drive is transmitted to the input shaft 3, the rotation is coded from the rotation angle transmitting gear 2 through the connecting gear 19. This rotation is sequentially transmitted to the upper code member 5 by being transmitted to the member 5a and further rotating the upper code member 5 intermittently via the pinion gear 20.

FIG. 9 is an explanatory diagram for outputting an alternating binary number by the mechanism of the first embodiment, and the code member 5 is typically a black light shielding portion 12 of the bit detecting end 11 and a white notch portion 13. It is represented by a circle, and the thick line portion around the circle represents the tooth portion of the drive gear 9. The pinion gear 20 is interposed between the adjacent code members 5.

When the rotation angle of the input shaft 3 is in the initial state, the output portions of the detection ends 11 of the code members 5a to 5d are all provided to the four photoelectric sensors 14 as shown in FIG. 9 (a). The notch 13 which is “0” is located, and the photoelectric sensor 14
The signal obtained at is 0000. Here, when the input shaft 3 rotates 1/4 counterclockwise and the code member 5a is in a state as shown in FIG. 9 (b), the output from the code member 5a is "1".
And the resulting signal is 0001. At this time, since the toothless portion of the drive gear 9 of the code member 5a has rotated, the rotation is not transmitted to the code member 5b.

Next, when the code member 5a further rotates 1/4 counterclockwise as shown in FIG. 9 (c), the rotation is transmitted to the code member 5b by the teeth of the drive gear 9, and the code member 5b is also 1/4.
Turn left and the signal becomes 0011. Next, the code member 5a
Is further rotated 1/4 counterclockwise, the drive gear 9 of the code member 5a is rotated.
Is a toothless portion, the rotation is not transmitted to the code member 5b, and the signal becomes 0010 as shown in FIG. 9 (d). In this way, the code members 5a to 5d continue to rotate intermittently and sequentially change as shown in FIGS. 9 (e), (f), and (g), and finally as shown in FIG. 9 (p). Gray code type police box 2 from 0000 to 1000 until the signal reaches 1000
The radix is obtained sequentially. Further, when the code member 5a is rotated to the left by ¼ from the state of FIG. 9 (p), the code members 5b to 5d
All rotate 1/4 counterclockwise and return to the initial state as shown in FIG.

In this way, in the embodiment, the rotational positions of the four code members 5 are obtained by the four photoelectric sensors 14 as 4-bit alternating binary signals. It should be noted that if the symbols "0" and "1" are made visible on the code member 5, the rotation angle can be read by alternating binary numbers by visual observation.

FIG. 10 is an explanatory view of the second embodiment, in which four code members 31a to 31d having bit detection ends like the code member 5 are meshed with each other by a pinion gear 20. Similarly to the reference numeral 9, the code member 31 schematically represents the light-shielding portion 33 at the bit detecting end in black and the cutout portion 34 in a white circle, and the thick line portion in the periphery thereof represents the tooth portion of the drive gear 35.

The bit detecting ends of the code members 31a to 31d are all composed of a 180-degree light-shielding portion 33 and a 180-degree cutout portion 34. In the initial state, as shown in FIG. 10A, the code member 31d is provided. Is in a state of being rotated ¼ right from the other code members 31a to 31c. Also, the code member 3
The drive gears 35 of 1a and 31b have four teeth at 90 degree intervals like the drive gear 9 of the code members 5a to 5c of the first embodiment.
The drive gear 35 of the code member 31c is a full-teeth gear having 16 teeth.

Also in this second embodiment, the code member 3
When 1a is rotated 1/4 counterclockwise, the code members 31a to 31d rotate intermittently as shown in FIGS. 10 (a) to 10 (p),
As in the first embodiment, alternating binary numbers 0000 to 1000 are sequentially obtained. Further, when the code member 31a is rotated 1/4 counterclockwise from the state of FIG. 10 (p), the code members 31b-3
1d all rotate 1/4 counterclockwise, returning to the state shown in FIG.

In the first and second embodiments, the case where the code members 5 and 31 are rotated only in the counterclockwise direction has been described, but it is also possible to rotate the code members 5 and 31 in the clockwise direction. (P) shown in FIGS. 9 and 10 in this case.
The operation of sequentially changing from the state of (a) to the state of (a) is performed. Further, the drive gears 9, 35 of the code members 5, 31
Although the toothless portion is formed on the toothed wheel to perform intermittent driving, the driving gears 9 and 35 are all toothed gears, and the toothless portion is formed on the portion of the pinion gear 20 that meshes with the driven gear 8. You can also do

In this case, the proper position of the valley portion of the toothless portion of the pinion gear 20 is formed higher than the other valley portions, and the pinion forms an outer peripheral surface almost equal to the outer diameter of the wheel 20. In the driven gear 8 that meshes with the gear 20, the crests of the long teeth and the crests of the short teeth are alternately formed in the axial direction. In the meshing of the driven gear 8 and the toothless portion of the pinion gear 20, the wave front of the crest portion of the long tooth comes into contact with the outer peripheral surface of the toothless portion of the pinion gear 20, and rotation of the driven gear 8 is restricted.

FIG. 11 is a block diagram of the third embodiment. A rotation angle detecting gear 42 is provided on one side plate 41a of a frame 41 made of a metal plate, and the rotation angle detecting gear 4 is provided.
An input shaft 43 for transmitting a rotation angle to be detected from the outside of the frame 41 is connected to the frame 2. Also, the frame 41
A main shaft 44 is supported between the side plate 41b on the other side and the rotation angle detecting gear 42, and the main shaft 44 is coaxially supported with the input shaft 43. The main shaft 44 has two code members 45.
a and 45b are inserted in parallel.

In these code members 45a and 45b, a gear portion 49 in which a driven gear 47 and a drive gear 48 are integrated is provided on one side of a cylindrical portion 46 having a through hole through which the main shaft 44 is inserted. Cam-shaped bit detecting ends 50 are attached to the central portions of 46, respectively. As shown in the schematic view of FIG. 12, a 180 ° light blocking portion 51 and a 180 ° cutout portion 52 are formed at the bit detecting end 50 of the code member 45.

The driven gear 47 of the code members 45a and 45b is a full-tooth gear having 16 teeth, and the code member 45a
The drive gear 48 is a toothless gear in which two tooth portions each having two teeth are formed at two positions separated by 135 degrees.
The drive gear 48 of 5b is a toothless gear having two tooth portions each having four teeth at 90-degree intervals. Furthermore,
A photoelectric sensor 53 is arranged so as to cover the bit detection end 50, and this photoelectric sensor 53 outputs a 1-bit signal of “0” or “1” corresponding to the light shielding portion 51 and the cutout portion 52 of the bit detection end 50. It is designed to output each.

On the other hand, a sub shaft 54 is supported by side plates 41a and 41b on both sides of the frame 41 in parallel with the main shaft 44, and the sub shaft 54 encodes the rotation of the rotation angle detecting gear 42.
A connecting gear 55 that transmits to 5a and two pinion gears 56 that transmits the rotation between the code members 45 are inserted.
A bit detection end 59 having a 180-degree light-shielding portion 57 and a 180-degree cutout portion 58 is fixed to these pinion gears 56 so as to rotate integrally, like the code member 45.
A photoelectric sensor 60 that outputs a 1-bit signal of "0" or "1" is arranged corresponding to the light-shielding portion 57 and the cutout portion 58 so as to cover the bit detection end 59. In addition,
The pinion gears 56 are both full-teeth gears having eight teeth.

In such a configuration, when the rotation angle to be measured by the external mechanical rotary drive is transmitted to the input shaft 43, the rotation is coded from the rotation angle detecting gear 42 via the connecting gear 55. This rotation is transmitted to the member 45a, and the upper code member 45b is intermittently rotated via the pinion gear 56, so that this rotation is performed.
Is transmitted to

FIG. 12 is an explanatory view for outputting an alternating binary number by the mechanism of the third embodiment, and the code member 45 schematically shows the light shielding portion 51 of the bit detecting end 50 in black and the cutout portion 52.
Is represented by a white circle, and the thick line around it is the drive gear 48.
Represents the tooth part of. Similarly, in the pinion gear 56 adjacent to the code member 45, the light shielding portion 57 of the bit detecting end 59 is represented by black and the cutout portion 58 is represented by white circle.

When the rotation angle of the input shaft 43 is in the initial state, as shown in FIG. 12 (a), the code members 45a,
The bit detecting end 50 of 45b and the bit detecting end 59 of the pinion gear 56 are notches 52 which are all “0” for a total of four photoelectric sensors 53 and 60 provided respectively.
Since 58 is located, the signals obtained by the photoelectric sensors 53 and 60 are 0000 in order from the left. Here, when the input shaft 43 rotates 1/4 counterclockwise and the code member 45a enters a state as shown in FIG. 12 (b), the output from the code member 45a becomes "1", and as a result, the signal becomes 0001. At this time, since the toothless portion of the drive gear 48 of the code member 45a has rotated, the rotation is not transmitted to the pinion gear 56.

Subsequently, when the code member 45a further rotates 1/4 counterclockwise as shown in FIG. 12 (c), the pinion gear 56 rotates 1/4 right by the teeth of the drive gear 48. The member 45b rotates 1/8 counterclockwise, and the signal becomes 0011. Next, when the code member 45a further rotates 1/4 counterclockwise, the rotation is not transmitted to the pinion gear 56 because the drive gear 48 of the code member 45a is a toothless portion.
The state becomes as shown in (d) and the signal becomes 0010. In this way, the code members 45a, 45b and the pinion gear 56 continue to rotate intermittently in succession, as shown in FIGS.
, (G), and as shown in FIG. 12 (p), alternating binary numbers of 0000 to 1000 are sequentially obtained until the signal becomes 1000. Further, when the code member 45a is rotated 1/4 counterclockwise from the state of FIG. 12 (p), the pinion gear 56
Rotates 1/4 right, the code member 45b rotates 1/8 left,
The pinion gear 56 at the final stage rotates 1/2 right and
The operation returns to the initial state as shown in (a), and the operation goes on.

In the case of the third embodiment, the code member 4
5 and pinion gear 56 both bit detecting ends 50, 59
Since a 1-bit signal can be obtained from the above, a double signal can be obtained in the same axial dimension, and a double resolution can be realized in a device of the same dimension.

The pinion gear 56 arranged on the counter shaft 54 may have a shape in which a bit detecting end is added to the pinion gear 20 as shown in FIG. 7, or a code member 5 as shown in FIG. Even if the shape is similar, there is no problem as long as it can be arranged in mounting.

In this type of rotation angle detecting device, a so-called reset for returning the output to a predetermined value or zero at an arbitrary rotation angle position of the input shaft 3 may be required. In the following embodiments, a rotation angle detection device equipped with a reset mechanism will be described.

FIG. 13 is a sectional view of the fourth embodiment, and the same reference numerals as those in FIG. 1 denote the same members. The main shaft 4 is rotatably supported in a shaft hole formed in the side plate 1b of the frame 1, and the sub shaft 18 is movably supported in a vertically elongated hole 61 formed in the side plates 1a and 1b. The sub shaft 18 is urged upward by a leaf spring 62 provided in the lower portion of the frame 1. Further, similarly to the first embodiment, the code member 5 is inserted in parallel with the main shaft 4, and the pinion gear 20 is inserted in parallel with the auxiliary shaft 18.

Also in this embodiment, the detection of the rotation angle is the same as in the first embodiment, and when the code member 5 is forcibly rotated by means not shown, the code member 5 pushes the pinion gear 20 downward. Then, as shown in FIG. 14, the distance between the counter shaft 18 and the main shaft 4 is increased, and the meshing between the gear portion 10 and the pinion gear 20 is temporarily disengaged, so that the code member 5 is adjusted to a desired rotational position. The output of the alternating binary number can be set to a desired value. Here, if it is set to zero, the output of the alternating binary number becomes zero, and the reset can be easily performed.

FIG. 15 is a configuration diagram of the fifth embodiment, and the same reference numerals as those in FIGS. 1 and 13 denote the same members. Similarly to the fourth embodiment, the auxiliary shaft 18 is axially movably supported in the elongated hole 61 and is urged upward by the leaf spring 62. The main shaft 63 penetrates through the side plate 1b of the frame 1 and is rotatably supported, and the main shaft 63 has sign members 64a to 64 having a driven gear 8, a drive gear 9, and a bit detecting end 11.
d is arranged in parallel, and a knob 65 is fixed to the end thereof, and the main shaft 63 is made to rotate by externally rotating the knob 65 at the time of resetting.

FIG. 16 is a rear view of the gear portion 66 of the code member 64, and the inside of the gear portion 66 is hollow. A V-shaped groove 67 is formed in the main shaft 63, and a spring member 68 is provided around the main shaft 63 so that a V-shaped projection 69 formed inside the main shaft 63 engages with the V-shaped groove 67.
An arm 70 having elasticity in the radial direction is attached to the outside of the spring member 68 so as to be rotatable integrally therewith. On the other hand, the inner peripheral surface 71 of the code member 64
A claw 73 that can be engaged with the tip portion 72 of the arm 70 is formed on the.

Also in this embodiment, the operation for detecting the rotation angle is the same as that of the first embodiment. At the time of reset, when the knob 65 is rotated and the spring member 68 is rotated in the arrow direction of FIG. 16 via the main shaft 63, the arm 70 slides on the inner peripheral surface 71 of the code member 64 as the main shaft 63 rotates. Rotate while moving. At this time, the code member 64 and the pinion gear 20 are meshed with each other, and the code member 64 does not rotate.

When the knob 65 is further rotated, as shown in FIG.
When the tip portion 37 of the arm 70 is engaged with the claw 73 of the inner peripheral surface 71 and does not slide, and the rotational force of the main shaft 63 is transmitted to the code member 64 via the arm 70 as shown in FIG. 64 pushes down the pinion gear 20, and as shown in FIG. 14 in the fourth embodiment, the distance between the auxiliary shaft 5 and the main shaft 63 increases, the meshing of the gears is temporarily disengaged, and the sign member 64 is forced. To rotate. The code member 64 moved to various rotational positions in parallel with the main shaft 63 has a knob 65.
By rotating, it is aligned to the same rotation angle position,
It is possible to reset the output of the alternating binary number to zero or set another numerical value.

The rotation of the input shaft 3 causes the connecting gear 1 to rotate.
9. When the rotational force is transmitted to the code member 64 via the pinion gear 20, the auxiliary shaft 18 does not separate from the main shaft 63, and the gear portion 66 and the pinion gear 20 rotate while meshing with each other. Further, in this case, when the distal end portion 72 of the arm 70 and the claw 73 of the code member 64 are engaged with each other, the main shaft 63 rotates as the code member 64 rotates.

FIG. 18 is a configuration diagram of the sixth embodiment, and FIG. 19 is an operation explanatory diagram of the reset mechanism, and the same reference numerals as those in FIG. 1 denote the same members. An auxiliary shaft 81 is supported by side plates 1 a and 1 b on both sides of the frame 1 in parallel with the main shaft 4. The auxiliary shaft 18 is supported by a movable member 82 rotatably provided around the auxiliary shaft 81 and is provided in parallel with the main shaft 4, and the auxiliary shaft 18 is downwardly moved as shown by a chain line in FIG. It is movable. Further, a reset lever 83 is connected to the counter shaft 18, and the reset lever 83 is connected to the reset lever 83.
By pressing downward, the distance between the main shaft 4 and the main shaft 4 is increased while maintaining the parallel with the main shaft 4, and the sub shaft 18 is constantly urged in the direction of the main shaft 4 by the leaf spring 84. .

On the other hand, code members 64a to 6 which are inserted through the main shaft 4 and have a driven gear 8, a drive gear 9, and a bit detecting end 11.
A heart-shaped cam 86 having a heart-shaped shape is integrally fixed to 4d, and a reset claw 87 is formed at the other end of the movable member 82 so that the heart-shaped cam 86 can be pressed. There is.

The rotation angle detecting operation is the same as that of the first embodiment, but when the reset lever 83 is pushed down at the time of resetting, the auxiliary shaft 18 connected to the reset lever 83 moves downward and the distance from the main shaft 4 is increased. Is enlarged, the engagement between the gear portion 66 and the pinion gear 20 is disengaged, and the code member 64 becomes rotatable. At the same time, as the auxiliary shaft 18 moves downward, the movable member 82 rotates about the auxiliary shaft 81, and the reset claw 87 of the movable member 82 presses the heart-shaped cam 86 of the code member 64 to make it rotatable. The sign member 64 is aligned at a predetermined rotation position as shown by the alternate long and short dash line in FIG.
As a result, the rotational position of the code member 64 is aligned with the initial state, and resetting the output of the alternating binary number to zero is performed by a simple operation.

The combinations of the driven gear of the code member, the number of teeth of the drive gear and the toothless portion, the arrangement of the light-shielding portion at the bit detection end, the notch, and the number of teeth of the pinion gear are mentioned in the above-mentioned embodiments. Other various combinations are possible and are designed based on the specifications of the rotation angle detecting device.

In the embodiment, a 4-bit output example is shown using a total of four code members and pinion gears. However, by using a larger number of code members and pinion gears, the number of output bits can be increased. Of course, the resolution can be increased.

Further, as the sensor, in addition to the photoelectric sensor used in the embodiment, various sensors such as a capacitance type or magnetic type proximity switch and a limit switch can be used. Further, the detection angle per resolution on the input shaft can be determined by a deceleration mechanism from the input shaft to the code member, such as a gear ratio of the rotation angle transmitting gear and the connecting gear.

[0048]

As described above, the rotation angle detecting device according to the present invention can detect the rotation angle by the alternating binary number based on the rotation position of the code member by the relatively simple mechanism using the toothless gear. .

Further, if a mechanism for aligning the code member or the pinion gear to a desired position is provided, the reset operation becomes possible and the processing of the detection signal becomes easy.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a side view of a code member.

FIG. 3 is a front view of a code member.

FIG. 4 is a front view of a code member at a final stage.

FIG. 5 is a rear view of the code member.

FIG. 6 is a perspective view of a drive gear.

FIG. 7 is a perspective view of a pinion gear.

FIG. 8 is an explanatory diagram of an engaged state of a drive gear and a pinion gear.

FIG. 9 is an explanatory diagram of an operation of obtaining an alternating binary number.

FIG. 10 is an explanatory diagram of an operation of obtaining an alternating binary number in the second embodiment.

FIG. 11 is a configuration diagram of a third embodiment.

FIG. 12 is an explanatory diagram of an operation of obtaining an alternating binary number according to the third embodiment.

FIG. 13 is a sectional view of a fourth embodiment.

FIG. 14 is an operation explanatory diagram.

FIG. 15 is a configuration diagram of a fifth embodiment.

FIG. 16 is a rear view of the code member.

FIG. 17 is an operation explanatory view.

FIG. 18 is a configuration diagram of a sixth embodiment.

FIG. 19 is an operation explanatory view.

[Explanation of symbols]

 1, 41 Frames 2, 42 Rotation angle transmission gears 3, 43 Input shafts 4, 44, 63 Main shafts 5, 31, 45, 64, 85 Code members 8, 47 Driven gears 9, 35, 48 Drive gears 11, 50, 59-bit detection end 14, 53, 60 Photoelectric sensor 18, 54 Secondary shaft 20, 56 Pinion gear

Claims (5)

[Claims] 1. A sub-assembly in which a plurality of code members having a drive gear and a driven gear are arranged in parallel with a main shaft, and the driven gear of the code member is provided in parallel to the drive gear of the adjacent code member. The drive gear or the pinion gear is meshed via a pinion gear arranged on a shaft so that a rotation angle mechanically input from the outside is sequentially transmitted to the upper code member as rotation of the code member. Of at least one of the gears is made to have a toothless gear, the adjacent upper code members are intermittently rotated through the driven gears, and each of the code members receives a 1-bit signal according to the rotation angle. And a sensor for detecting the rotation position of the detection end, and outputs the rotation angle input from the outside as an alternating binary digital signal based on the rotation position of the detection end. A rotation angle detecting device having a mechanism for 2. The pinion gear is provided with a detection end representing a 1-bit signal according to its rotation angle, a sensor for detecting the rotational position of the detection end is provided, and the detection end of the code member and the pinion gear are detected. The rotation angle detection device according to claim 1, wherein the rotation angle input from the outside is output as an alternating binary digital signal by signals from both ends. 3. A mechanism for movably disposing the sub shaft and temporarily enlarging a distance from the main shaft, disengaging the meshing between the pinion gear, the drive gear, and the driven gear, The rotation angle detection device according to claim 1, further comprising a mechanism for aligning the code member or the pinion gear to a desired rotation position. 4. A toothless gear in the drive gear or the pinion gear, wherein a proper portion of a valley portion of the toothless portion is formed higher than other valley portions to form an outer peripheral surface substantially equal to a gear outer diameter, In the gear that meshes with the tooth-missing gear, the tooth portions of the long tooth in the axial direction and the short tooth portion are alternately formed, and in the engagement of the tooth-missing portion that does not transmit rotation, the tooth surface of the mountain portion of the long tooth is The rotation angle detecting device according to claim 1, further comprising an intermittent drive mechanism that is in contact with an outer peripheral surface of the tooth-chipped gear and that controls a rotation of the tooth-chipped gear. 5. The rotation angle detecting device according to claim 1, wherein the sensor is a proximity switch that outputs a 1-bit signal in accordance with a rotational position of the code member or a photoelectric sensor that outputs a 1-bit signal by reflection or light shielding. .