JPS6321866B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a maximum demand meter that displays maximum demand power, etc., and particularly relates to a maximum demand meter that can easily return to zero. Conventionally, maximum demand power meters, for example, have generally used a single scale display with a pointer, that is, an analog display, but development is progressing to replace this analog display with a digital display to improve measurement accuracy and reduce reading errors. . This type of maximum demand wattmeter transmits the drive rotational force proportional to the amount of power consumed by a pusher through an idling gear mechanism to a display device via a gear transmission mechanism and an intermittent rotation mechanism, and displays the amount of power consumed on the display. are doing. The idle gear mechanism and pusher return to zero at predetermined time intervals, and the maximum power demand is displayed on the display. Further, after a predetermined period of time has elapsed, the number wheel of the display, the idling gear mechanism, and the pushing hand are returned to zero by the operation lever. In both analog and digital maximum demand power meters, zero return and restart are not the same operation but multiple operations. In some cases, the pointer returns to the pusher's position even if the pusher returns to zero, but the pointer cannot return to zero because the pusher does not return to zero when the pusher performs the zero-return operation. Since there is no clutch, there are problems with zero return, such as a large operating torque and a long time required for zero return operation (particularly zero return operation). The analog display maximum demand power meter is driven by a hand that directly pushes the pointer, which is a display device. Additionally, the pointer is attached with enough frictional torque to prevent it from moving due to vibrations or shocks. Returning to zero is performed by turning this pointer counterclockwise with the operating lever.
Setting for restart is performed by turning the operation lever clockwise after the zero return is completed. On models with a clutch attached to the pusher, both the pusher and the pointer can be returned to zero by the zero return operation, but on some models without a clutch, the pointer can only return to the pusher position. The maximum demand power meter with digital display uses an idle gear mechanism to memorize the rotation angle of the maximum value. If the number of idling stages of the idling gear mechanism is increased, the memorized rotation angle accuracy will be improved, but due to problems with the external dimensions of the device and accuracy, it is limited to a few stages. Therefore, the permissible number of revolutions cannot exceed the number of idling stages, so it is several times. Since the number wheel of the display device has several digits, if the number of digits is expressed as n, the required number of rotations of the last digit wheel is 10 to the n-1 power. If we compare the rotation ratio of the idle gear mechanism and the last number wheel, we can see that the last number wheel is larger. Therefore, gear transmission from the idling gear mechanism to the last digit wheel has a gear ratio that increases speed. On the other hand, since it is desired that the zero return operating lever completes its operation in one revolution or less, the gear combination connecting the zero return operating lever, the idle gear mechanism, and the number wheel is required to have an extremely large gear ratio. Therefore, since the rotational torque required for the zero return operation is large, the structure of related parts also needs to be large. Since the number wheel and feed wheel use an intermittent gear mechanism, the zero return rotation also needs to rotate sequentially starting from the last number wheel in the opposite direction to that used during measurement. Therefore, when the measured value is large, the zero return time becomes long. Since it is rotated at a high speed in order to shorten this zero return time, the last number wheel is subject to severe wear and durability. The object of the present invention is to eliminate the above-mentioned drawbacks, and to provide a maximum demand meter that is reliable and accurate, has a light zero-return torque, and can perform zero-return and restart operations with just one rotation in the clockwise direction. An embodiment of the present invention will be described below with reference to the drawings. To explain the configuration of the embodiment of this invention,
A transmission device for measuring power demand (hereinafter referred to as transmission device A) 1000, a time clutch 1001, a transmission device for measuring maximum power demand (hereinafter referred to as transmission device B)
1002, zero return clutch 1003, maximum demand power measurement display device (hereinafter referred to as display device) 10
04, step drive device 1005, push hand zero return device 1006, transmission device B zero return device 100
7. It has a configuration of a zero return device 1008 for a display device. A step-by-step explanation will be given below. For example, a driving force proportional to the amount of power consumed is transmitted to the transmission device A1000 gear 1. A gear 1 and a gear 3 are fixed to a shaft 2, and one end of the shaft 2 is rotatably held by an L-shaped lever 21. The L-shaped lever 21 is a timed clutch 1
001 will be explained in detail. Gear 3 meshes with gear 5 fixed to shaft 4. A pusher 6 and a gear 7 are further fixed to the shaft 4, and an idle gear device 8 is rotatably provided. One end of the idle gear device 8 is the pusher 6
In addition, the other end is connected and engaged with the stop rod 9.
A pusher 24, an idle gear device 25, and an arm gear combination 26 are further installed on the shaft 4, but the transmission device B
1002 will be explained in detail. The gear 7 meshes with a gear 11 fixed to a shaft 10. Gears 12 and 13 are also fixed to the shaft 10. The gear 12 meshes with a sector gear 16 fixed to a shaft 15 and provided with a helical spring 14 pulling counterclockwise. gear 1
3 meshes with a gear 18 fixed to a shaft 17. A pointer 19 is fixed to one end of the shaft 17. Time clutch 1001 L-shaped lever 2 rotatably provided on shaft 20
A helical spring 22 having a force that prevents the gears 3 and 5 from coming out of engagement when they rotate in engagement is suspended on the gear 1, and a pin 73 is fixed thereto. When a force is applied counterclockwise to the lower right end 23 of the L-shaped lever 21 against the tensile force of the helical spring 22, the gears 3 and 5 are disengaged. Transmission device B1002 The shaft 4 also rotates due to the rotation of the gear 5. This shaft 4 includes the pusher 6 described in the transmission device A1000,
In addition to the gear 7 and the idling gear device 8, a pusher 24 is fixed, and an idling gear device 25 and an arm gear combination 26 are rotatably installed. The arm gear combination 26 has gears 27, 28 and an arm 29 fixed to each other. One end of the idle gear device 25 is a pusher 24, and the other end is an arm 29.
is connected with. Gear 27 meshes with gear 31 fixed to shaft 30. The rotation of the shaft 30 is transmitted to a gear 42 of a zero return clutch 1003, which will be described later. Gear 42 meshes with gear 33 fixed to shaft 32. A crown gear 35 that meshes with a gear 34 is fixed to the shaft 32. The gear 34 is fixed to a shaft 37 coaxially with the gear 36. Gear 34 is for driving step drive 1005, and gear 36 is for driving transmission B.
1002 is transmitted to the display device 1004 via the step drive device 1005. Further, the gear 28 of the arm gear combination 26 is for transmitting power to a zero return device 1007 of a transmission device B, which will be described later. Zero Return Clutch 1003 A zero return clutch 1003, detailed in FIGS. 2 and 3, is installed on the shaft 30 to which the gear 31 of the transmission device B 1002 is fixed. In the embodiment of this invention, two crown gears are used and the interlocking of the gears is utilized. On the fixed side of the clutch, a crown gear 39 with a ring-shaped permanent magnet 38 fixed at its inner center is fixed to the shaft 30. On the movable side, a crown gear 41 with a ring-shaped permanent magnet 40 fixed to the center inside thereof, similar to that on the fixed side, is rotatably and slidably attached to the shaft 30. An elongated gear 42 is fixed to the center of the outer side of the movable crown gear 41 in the axial direction. Further, the intermediate portion between the crown gear 41 and the gear 42 has a flange-shaped projection 43.
is formed. Therefore, the flange-shaped projection 43 and the gear 4
This means that a groove 44 is formed between the holes 2 and 2. An arm 55 described below is inserted into this groove 44. In order to return to zero during meter reading, the zero return shaft 45 is rotated once clockwise, and a cam 46 for driving the zero return clutch 1003 is fixed to this zero return shaft 45. The cam 46 has a shape with a projection 47 partially on the cylindrical surface. The clutch lever 48 that comes into contact with the cam 46 has its end fixed to a shaft 49, has a protrusion 50 on the part that contacts the cam 46, and has a helical spring 51 attached to the opposite end of the shaft 49, so that the clutch lever 48 is connected to the cam 46. A spring force is applied in the direction in which the protrusion 50 of the lever 48 comes into contact. Further, the clutch lever 48 is extended in the vicinity where the helical spring 51 is attached, and a hole 52 is provided in the vicinity of the zero return clutch 1003. The end of an arm support rod 54 having a shaft 53 is inserted into the hole 52 of the clutch lever 48 with a slight gap. An arm 55 is attached to the arm support rod 54, and the tip of the arm 55 is inserted into the groove 44 of the zero return clutch 1003. Permanent magnets 38 and 40 fixed to the inner center of the crown gears 39 and 41 are magnetized in a direction that attracts each other, and unless a force is applied in the axial direction of the shaft 30, the crown gears 39 and 41 are always in occlusion. It's on.
When the protrusion 47 of the cam 46 and the protrusion 50 of the clutch lever 48 are in contact with each other, as shown in FIG. It is designed not to interfere with rotation. When the cylindrical portion of the cam 46 and the protrusion 50 of the clutch lever 48 are in contact with each other, the arm 5
Since the tip of No. 5 pushes the side surface of the gear 42, the crown gears 39 and 41 are disengaged. Therefore gear 3
1 rotation is not transmitted to gear 42. Display device 1004 The gear 36 of the transmission device B1002 is engaged with a gear 57 rotatably provided on a shaft 56. The cam plate 58 is rotatably provided on the shaft 56 together with the gear 57. This cam plate 58 is loosely engaged with 59. It meshes with the feed wheel 60. Although the number wheel 61 will be described in detail below, the feed wheel 60 and the number wheel 61 indicate the rotation of the occlusal transmission device B1002. The number wheel 61 and the feed wheel 60 are provided in the required number according to the number of displayed digits. Therefore, the number wheel 61 meshes with the lower feed wheel 60 and the upper feed wheel 62. The number wheel 61 is a geared ratchet wheel 63 that meshes with the lower feed wheel 60.
and a number ring 64 are combined. number wheel 64
A gear 65 having a Geneva mechanism for intermittently driving the upper feed wheel 62, a number wheel train 66, a gear 102 for returning to zero for the number wheel described in detail in the zero return device 1008 of the display device, and a geared pawl. It has an internal gear wheel 68 that receives a pawl 67 of a wheel 63. Geared ratchet 63
is a gear 69 that meshes with the lower feed wheel 60, a pawl 67 that elastically meshes with the internal toothed wheel 68 of the number ring 64, and a geared ratchet wheel detailed in the zero return device 1008 of the display device. It has 63 positioning pins 107. In order to combine the number wheel 64 and the geared pawl 63 to form the number wheel 61 as shown in FIG.
The tooth lines of the teeth are arranged in a straight line. Claw 6
The lower limit of the coupling force between 7 and the internal gear wheel 68 is that when rotational force is applied from the lower feed wheel 60, it passes through the number wheel 61 to the higher order feed wheel 62, and then to the higher order number wheel and feed wheel. A rotational force is transmitted, and it has a coupling force that can transmit this rotational force. The upper limit of the bonding force will be explained in detail in the zero return device 1008 of the display device, but the geared pawl 63 is fixed using the positioning pin 107 of the geared pawl 63, and the number wheel of the number wheel 64 is reset to zero. When the gear 102 for use is driven, the pawl 6
7 has a bonding force that allows it to slide on the internal gear 68. Step Drive Device 1005 A magnetic disk 70 is fixed to the other end of the gear 36 and coaxial 37, which is magnetized so that N and S polarities are arranged on one side as shown in FIG. Further, a magnetic disk 71, which is the same as the magnetic disk 70, is fixed at a fixed interval opposite the magnetized surface of the magnetic disk 70, with the magnetized surfaces facing each other. Push hand zero return device 1006 The zero return shaft 45 for returning to zero during meter reading includes:
A cam 72 that activates zero return of the pusher 24 is also fixed. The cam 72 has the shape of a disc with a notch on its outer circumferential surface, and abuts against and engages with the pin 73 fixed to the L-shaped lever 21 described in connection with the time clutch 1001. When the circumference of the cam 72 contacts the pin 73, the L-shaped lever 21 is rotated counterclockwise.
Gear 3 and gear 5 are disengaged. Further, the notch portion of the outer peripheral surface of the cam 72 is cut out so as not to contact the pin 73. Zero return device 1007 of transmission device B A friction wheel lever 74 that comes into contact with a cam 46 fixed to a zero return shaft 45 for returning to zero during meter reading, which is also used in the zero return clutch 1003, has an end fixed to the shaft 75. It has a protrusion 76 on the part that contacts the cam 46, a helical spring 77 is attached to the opposite end of the shaft 75, and the cam 46 and the friction wheel lever 7 are connected to each other.
A force is applied by the spring in the direction in which the protrusion 76 of No. 4 comes into contact. Further, an arm 78 is fixed to the side surface of the friction wheel lever 74, and a pincushion-shaped roller 79 is rotatably attached to the tip of the arm 78. A differential gear mechanism 80 is also attached to the zero return shaft 45. The differential gear mechanism 80 has a planetary gear 81 in the center and sun gears 82 and 83 on both sides. A disk 84 having many recesses on the outer periphery is fixed to one sun gear 82, and a gear 84 is fixed to the other sun gear 83.
5 is fixed. When the protrusion 76 of the friction wheel lever 74 and the protrusion 47 of the cam 46 are in contact with each other, the pincushion-shaped roller 79
The friction wheel lever 74 does not come into contact with the disk 84, but the friction wheel lever 74
In the range where the protrusion 76 is removed from the protrusion 47 of the cam 46, the pincushion-shaped roller 79 is pressed against the outer circumferential recess of the disc 84 by the tension of the helical spring 77. The gear 85 fixed to the sun gear 83 is connected to the shaft 86
The gear 87 is fixed to the shaft 8, and the gear 87 is further fixed to the shaft 8.
It meshes with a gear 89 fixed to 8. axis 8
A gear 90 is also fixed to the gear 8 and meshes with the gear 28. Zero return device 1008 for display device A bevel gear 91 and a cam 92 for returning the number wheel 61 to zero are also fixed to the zero return shaft 45 for returning to zero during meter reading. The bevel gear 91 is a bevel gear 9 fixed to the end of the shaft 93.
Engage with 4. A bevel gear 95 is also fixed to the other end of the shaft 93, and meshes with a bevel gear 97 rotatably attached to a shaft 96. A gear 98 is fixed to the bevel gear 97. Gear 98 meshes with gear 100 fixed to shaft 99. The same number of gears 101 as number wheels 61 are fixed to the shaft 99 . This gear 101 can mesh with a gear 102 formed within the number ring 64 of the number wheel 61. The gear 102 is not formed around the entire circumference of the number wheel 64, but lacks a tooth profile corresponding to one number in the number wheel train 66. That is, gear 101 and gear 102
When the number wheel 64 is rotated in the zero return direction and the number of the number wheel train 66 displays 0, the tooth profile of the gear 102 is missing so that the part where the tooth profile is missing faces the gear 101. The fulcrum of the swing frame 103 is a shaft 96, a shaft 99 is rotatably held, and the shafts 104, 105, and 106 are fixed. The shaft 104 has a setting pawl 10 that engages with a positioning pin 107 of the geared pawl 63 of the number wheel 61.
8 is attached. The shaft 105 passes through one end of the setting claw 108 to increase the positional accuracy of the setting claw 108 and ensure fixation. Further, a helical spring 109 is attached to the swing frame 103 in a direction in which the meshing of the gears 101 and 102 is separated. One end of the shaft 106 is fixed to the swing frame 103, and a roller 110 is rotatably attached to the other end.
is in contact with the edge surface of the cam 92, and as the cam 92 rotates, the swing frame 103 swings about the shaft 96 serving as a fulcrum. The cam 92 has an end surface that abuts and engages with the roller 110, and is attached with a pin 111 that engages with a zero return lever (not shown) during meter reading. Next, the operation of the embodiment described above will be explained. Measurement of Demand Power The pusher 24 related to measurement of power demand for each unit time period and measurement of maximum power demand will be described. The pushing hand 6 and the idle gear device 8 are all engaged,
The idling gear device 8 is further in contact with the stop bar 9, and in the tension state, the pointer 19 is on the demand power scale (not shown).
Indicate the zero point of When a driving force proportional to the amount of power consumed is transmitted to the gear 1, the gear 3 rotates the gear 5, and the idle gear device 8 rotates in a direction in which the tensioned state is released. Further, the sector gear 16 rotates via the gears 7, 11, and 12, and tensile force is accumulated in the helical spring 14. At the same time, the gears 13 and 18 also rotate, and the pointer 19 also rotates to indicate a scale proportional to the driving force. When the demand period ends, a timing device (not shown)
The lower right end 23 of the L-shaped lever 21 is pushed up against the tensile force of the helical spring 22, and the gears 3 and 5 are disengaged. At the same time as this meshing is released, the gears 5, 7, 11, 12, 13, 16, 18 return to this state due to the tensile force accumulated in the helical spring 14, and at the same time, the idle gear device 8 and the pusher 6 , the stop rod 9 is also brought into tension, and the zero point stop position is regulated, so that the time until the stop is shortened and the stop position accuracy is improved. Note that since the pusher 24 is fixed to the gear 5, when the L-shaped lever 21 is moved so as to disengage the gears 3 and 5, the pusher 24 also returns to the zero point. Step feeding of the number wheel The rotation of the pusher 24 is transmitted to the idle gear device 25. The above rotation is transmitted to the cam plate 58 via the gears 27, 31, the crown gears 39, 41, the gears 42, 33, and the crown gear 35, the gears 34, 36, 57 when the idle gear device 25 is in a tensioned state. If this rotation is directly transmitted to the number wheel 61 via the feed wheel 60, the number wheel 61 will not display digitally, so it is necessary to feed the cam plate 58 in steps. Therefore, step feeding will be explained below. The magnetic disks 70 and 71 are magnetized into 12 poles with N and S polarities alternated as shown in FIG. Here, when the opposing state of the magnetized surfaces of the magnetic disk 70 and the magnetic disk 71 is in the state shown in FIG. Suppose that the magnetic disk 70 starts rotating when the At this time, the cam portion of the cam plate 58 is in the state immediately after rotating the feed wheel 60, that is, as shown in FIG. There is a little leeway. When the magnetic disk 70 begins to rotate in the direction of the arrow, it resists the attractive force of the magnetic poles, so the idle gear device 25 remains in tension as shown in FIGS. 7a and 7b.
Rotate the magnetic disk 70 and cam plate 58 until the state is reached. In this state shown in FIG. 7b, the cam portion (shaded area) of the cam plate 58 has not yet acted on the blades (shaded area) of the feed wheel 60. Next, when the magnetic disk 70 rotates slightly from this state, the magnetic poles of the magnetic disks 70 and 71 repel each other, and the repulsive force causes the magnetic disk 70 to rapidly rotate in the direction of the arrow. Then, after rotating for a while, the magnetic disk 70 and the magnetic disk 71 are attracted and the seventh
It stops in the state shown in figure a-. At this time, the cam plate 58
The cam (shaded part) is the blade of the feed wheel 60 (shaded part)
, rotate the feed wheel 60 by 1/4 turn, and turn the feed wheel 60 to
- Stops in state. This transition from state to state is
Magnetic disk 70 Magnetic disk 71
This is done instantaneously by utilizing the repulsion and suction of the feed wheel 60, and the feed wheel 60 is fed in steps of 1/4 turn. This 1/4 rotation of the feed wheel 60 causes the number wheel 61 to advance one digit, so the number wheel 61 reliably displays digitally without displaying an intermediate number. It should be noted that during step feeding, the series of gears and the arm 29 of the idling gear device 25 are rotated, but since the direction of rotation is the direction in which the tension of the idling gear device 25 is released, the step feeding is not inhibited in any way. Display of maximum power demand As described above in the measurement of power demand, when the demand time period ends, the pusher 24 is rotated by the timer (not shown) in the opposite direction to the direction used during measurement to return to zero. However, the idle gearing 25 does not transmit its rotation to the gear 27, so the number wheel 61 remains in the metered position. When the next demand period begins, the pusher 24 rotates again according to the power consumption, but the idle gear device 25 still has play corresponding to the maximum value of the demand power measured up to the previous time, and that play is The rotation of the pusher 24 is not transmitted to the gear 27 until it runs out. Therefore, if the pushing hand 24 does not rotate by an amount corresponding to the maximum value of the demand power measured up to the previous time, the display device 1
004 continues to hold the maximum value up to now. As described above, the maximum demand power value is displayed on the display device 1004. On the other hand, the rotation of the pusher 24 drives the display device 1004 and at the same time
7, 85 and a differential gear mechanism 80, the disc 84 is idled. Return to zero and restart during meter reading According to this embodiment, return to zero and restart during meter reading are performed by rotating the cam 92 clockwise by operating a zero return lever (not shown) that engages the pin 111. This is done by rotating it. The rotation of the cam 92 is caused by the rotation of the shaft 45.
The transmission is transmitted to the cam and gear attached to the pusher 2.
The 4-arm 29-number wheel 64 is returned to zero and enters a restart state. First, the zero return and restart operations of the pusher 24 will be described in detail. During power demand measurement, the pin 73 of the cam 72 fixed to the shaft 45 is located in the notch on the outer peripheral surface. As the shaft 45 rotates, the outer peripheral surface of the cam 72 and the pin 73 come into contact, pushing up the L-shaped lever 21 and disengaging the gears 3 and 5. The state in which the gears 3 and 5 are disengaged is the same as the operation performed at the end of the demand period, and the pusher 24 returns to zero using the accumulated tensile force of the helical spring 14 as a driving source. When the shaft 45 further rotates,
The pin 73 is located again in the cutout part of the cam 72, and the pushing force on the L-shaped lever 21 is removed, and the gears 3 and 5 engage with each other to enable restarting. Next, the zero return and restart operations of the arm 29 will be described in detail. Zero return clutch 10 during power demand measurement
Crown gears 39 and 41 of 03 are interlocking,
Rotation of shaft 30 can be transmitted to shaft 32. Further, the disk 84 of the zero return device 1007 of the transmission device B is in an idle state. Due to the rotation of the zero return shaft 45, the protrusion 50 of the clutch lever 48, which was in contact with the protrusion 47 on the cylindrical surface of the cam 46 fixed to the zero return shaft 45,
The protrusion 47 on the cylindrical surface of the cam 46 is disengaged, and the hole 52 of the clutch lever 48 moves upward in FIG. Due to the movement of the hole 52, the tip of the arm 55 moves to the right in FIG. 1, as also shown in FIG. Since the tip of the arm 55 pushes the side of the gear 44, the crown gear 4 fixed to the gear 44
1 also moves to the right in FIG.
2 transmission becomes impossible. Note that the length (thickness) of the teeth of the gear 33 is made larger than the amount of movement of the gear 44, so that the gears do not mesh with each other. After the crown gears 39 and 41 are disengaged, that is, the zero return clutch 1003 is opened, the arm 29, which will be described next, is returned to zero. cam 4
A clutch lever 48 is mounted on the protrusion 47 on the cylindrical surface of 6.
However, due to the rotation of the cam 46, the friction wheel lever 74 with the projection 76, which has a contact point later than this contact point, contacts the projection 47 on the cylindrical surface of the cam 46 and the friction wheel lever 74. The protrusion 76 of 74 is removed, and the friction wheel lever 74 moves toward the center of the zero return shaft 45. With this movement, the roller 79 attached to the friction wheel lever 74 presses the disc 84 with the tension of the helical spring 77. That is,
Since one side 82 of the sun gear of the differential gear mechanism 80 is fixed, the rotation of the zero return shaft 45 is performed through the planetary gear 81 and the sun gear 83 of the differential gear mechanism 80, and further through the gears 85, 87, 89, The gear 27 is rotated via 90. Since the gear 27 and the arm 29 are fixed, the arm 27 can be returned to zero. After the pusher 24 returns to zero in the above manner, the arm 29 is rotated in the zero return direction, so that the arm 29, including the idle gear device 25, becomes in tension at the zero point position. This is arm 2
It is to perform the zero return of 9. The position at which the pusher 24 starts returning to zero is arbitrary because it is proportional to the maximum power demand, but the zero point position is always the same. Therefore, since the angle at which the pusher 29 rotates for zero return is arbitrary, the zero return of the pusher 24 is completed at an arbitrary rotation angle of the zero return shaft 45. However, the zero return shaft 45
is always rotated once, so the rotation of the zero return shaft 45 after the zero return of the pusher 24 is completed is due to the differential gear mechanism 80.
The force is transmitted to the disc 84 via the planetary gear 81 and the sun gear 82, and the disc 84 rotates by overcoming the pressing force of the helical spring 77 that was pressing the outer periphery of the disc 84.
Since the gear ratio of the combination of gears 85, 87, 89, 90, and 27 is determined by giving some margin to the allowable rotation speed of the idling gear device 25, the zero return shaft 45
The disk 84 is always rotated before the end of one rotation. Rotating the zero return shaft 45 by sliding the disc 84 and the roller 79 while applying a tensile force to the disc 84 by the helical spring 77 is achieved by rotating the gears 85 and 8.
This means that the arm 29 is pressed against the zero point position via the arms 7, 89, 90, and 26, and the zero point position is held accurately. In this state, the cam 46
When the zero return shaft 45 is rotated so that the projection 47 on the cylindrical surface of the clutch lever 48 comes into contact with the projection 50 of the clutch lever 48,
The clutch lever 48 is driven, and the crown gear 41 and the crown gear 39 engage with each other via the arm 55. That is, the zero return clutch 1003 is closed. Further, the zero return shaft 45 rotates and the protrusion 76 of the friction wheel lever 74 comes into contact with the protrusion 47 of the cam 46, so the friction wheel lever 74 is pushed down and the disc 8
4 and roller 79 are separated, and the differential gear mechanism 80 becomes idle, allowing restart. Next, the zero return and restart operations of the number wheel 64 will be described in detail. During power demand measurement, the cam 92 is placed at a position where the roller 110 contacts the concave portion of the edge surface of the cam 92.
is set. The upper part of the swing frame 103 is pulled in the opposite direction to the number wheel 61 by a helical spring 109, and set so that the setting pawl 108 gear 101 does not come into contact with the number wheel 61. When the cam 92 starts rotating, the bevel gear 9
1, 94, 95, 97 and gears 98, 100 to turn gear 101, but gear 101 and number wheel 6
Since the gear 102 molded into 4 is not engaged, the gear 101 is spinning idly. When the cam 92 is rotated, the roller 110 comes into contact with the outer periphery of the edge surface of the cam 92 (in a part that is not a recess), so that the upper part of the swing frame 103 approaches the number wheel 61 with the shaft 96 as a fulcrum. Therefore, the tip of the setting pawl 108 is connected to the positioning pin 1 of the geared pawl 63.
07, and serves as a stopper to prevent the geared pawl 63 from rotating. Moreover, when the upper part of the swing frame 103 approaches the number wheel 61, the gear 103 that is idling
meshes with the gear 102 formed on the number ring 64,
The number wheel 64 is rotated in the direction in which the numbers in the number wheel train 66 become smaller. At the location where the number on the number wheel train 66 indicates 0, the gear 101 idles because the gear 102 has no teeth, and the zero return of the number wheel 61 is completed. When the cam 92 is rotated one more time, the roller 110 comes into contact with the recess on the edge surface of the cam 92, so that the upper part of the swing frame 103 moves away from the number wheel 61, allowing restart. As described above, according to the present invention, the transmission device B
By providing a zero return clutch 1003 between the display device 1002 and the display device 1004, and by making the number wheel 61 a combination of a geared pawl wheel 63 and a number wheel,
Gears 33, 34, 35, 36, 4 to return to zero during meter reading
Since the 2, 57, 69 cam plates 58, the feed wheels 60, 62, and the magnetic disk 70 do not rotate, the zero return rotational force during meter reading is reduced, and the zero return lever (not shown) can be made smaller. Further, the fixing force of parts such as gears, shafts, cams, etc. that transmit the force for returning to zero during meter reading from the zero return lever and the parts themselves can be made smaller. In order to return the arm 29 of the transmission device B1002 to zero, a combination of a differential gear mechanism 80, a disc 84, a friction wheel lever 74, etc. is provided between the zero return shaft 45 and the arm 29, and a gear 102 of the number wheel 61. and gear 1
Since the number wheel 64 is driven by the 01 engagement, zero return and restart can be performed by rotating the zero return lever in one direction during meter reading, making operation easier. When returning the number wheel 61 to zero, the gear 102 and the gear 101 are engaged and the number wheel 64 is rotated.
The movement of the number train only moves to lower numbers, so
The validity of the zero return operation is confirmed and the meter reader feels psychologically secure. When the number wheel 64 rotates and the number wheel train 66 reaches 0, since the gear 102 is partially removed, the number 9 will not exceed 0 and the zero return operation will be performed reliably. It has the effect of

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the mechanism of a maximum demand meter according to an embodiment of the present invention, Fig. 2 is a cross-sectional side view showing the case where the zero return clutch is closed, and Fig. 3 is a view when the zero return clutch is open. FIG. 4 is a partial cross-sectional perspective view of the number wheel and feed wheel; FIG. 5 is a plan view and side view of the number wheel and geared ratchet wheel that make up the number wheel; FIG. 6 is a diagram showing the procedure for magnetizing the magnetic disk, and FIG. 7 is an explanatory diagram of the step feeding operation of the number wheel. In the figure, 6 is a pusher, 61 is a number wheel, 63 is a geared pawl, 64 is a number wheel, 1000, 1002 are a transmission device, 1003 is a zero return clutch, 1004 is a display device, 1006, 1007, 1008 are zeros. It is a return device.

Claims (1)

[Claims] 1. A push hand that rotates in proportion to the demand quantity and returns to zero at each demand time period, and an arm that follows the rotation of the push hand via an idle gear device and remains at the position of the maximum demand quantity. , a transmission device that transmits the rotational movement of the pushing hand through the rotation of the arm to a digital display device having a plurality of number wheels, and a manual zero return means for returning the pushing hand, arm, and display device to zero at any time. In the apparatus, the transmission device includes:
A clutch capable of disconnecting conduction is provided between the arm and the display device, and the zero return means includes:
A differential gear device includes a zero return cam that is manually rotated once in a predetermined direction, a pair of sun gears that are rotatably inserted into a shaft integral with the cam, and the rotation of the cam causes the means for releasing the clutch and locking one of the sun gears so as not to rotate; and in a state where one of the sun gears is locked, the other sun gear is rotated by the rotation of the cam to rotate the sun gear; A transmission mechanism that returns the arm to zero,
a slip mechanism that allows the cam to rotate in the predetermined direction even if the sun gears do not rotate after the arm returns to zero; a gear device that rotates in conjunction with the rotation of the cam; a number wheel zero return mechanism that engages the gear device with the number wheel to return the number wheel to zero in response to the rotation of the cam; and a mechanism for returning the disengaged clutch, releasing the locking of the sun gear, and releasing the engagement of the gear device engaged with the numbered wheel when the number wheel rotates once. Maximum demand meter.