JP3589189B2 - Timepiece rotation torque measuring device and timepiece torque measurement method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotating torque measuring device and a rotating torque measuring method for a timepiece, and more particularly to a measuring device and a measuring method for measuring a rotating torque of a mechanical timepiece or an electronically controlled mechanical timepiece that drives a wheel train with a mainspring. .
[0002]
[Background Art]
2. Description of the Related Art Conventionally, as a method of measuring a rotating torque (rough torque) of a wheel train of a mainspring-driven mechanical timepiece or the like, those described in Japanese Patent Publication No. 7-3371 and Japanese Patent Application Laid-Open No. 10-267768 are known. ing.
[0003]
The measuring methods described in these publications are based on a method in which a pointer (minute hand, second hand) is mounted on a shaft of a minute wheel or a second wheel in a wheel train, and the entire movement is rotated around the shaft to be locked by the hand. The helix spring is displaced by the terminal, and the rotation angle of the helix spring that has been displaced is measured visually or by an image processing device.
According to such a measuring method, it is possible to measure a minute rotation torque generated in the wheel train by the correlation between the rotation angle of the helix spring and the rotation torque.
[0004]
[Problems to be solved by the invention]
However, in the method described in the above-mentioned publication, since the rotation torque is measured by driving the minute wheel and the second wheel, the measurement cannot be performed by driving the barrel wheel, which is the original drive source. There is a problem that it is not possible to measure the rotational torque of the entire wheel train including the second wheel and the second wheel.
[0005]
In addition, as the rotational torque, when the rotation angle of the helical spring is the maximum, that is, since the maximum rotational torque is exclusively measured, it is not possible to analyze the influence of the eccentricity of the tooth shape defect and the gear diameter on the rotary shaft, and the unevenness of the hand operation. Could not detect any mechanical failures.
[0006]
An object of the present invention is to provide a rotation torque measurement device and a rotation torque measurement method for a timepiece that can measure the rotation torque of the entire wheel train and can reliably detect a mechanical defect of hand movement unevenness.
[0007]
[Means for Solving the Problems]
Torque measuring device for a timepiece of the present invention, there is provided a torque measuring device for a timepiece used in timepiece having a train wheel driven by the mechanical energy of the mainspring, to the barrel complete and meshed to a driving source Rotation drive means for rotating the entire movement incorporating the wheel train around the barrel true, a torque output member fixed to the barrel drive, a torque measurement terminal locked to the torque output member, and a torque measurement Arithmetic processing means for calculating a torque value based on the amount of mechanical displacement occurring at the terminal.
[0008]
According to the present invention, since the barrel wheel side is the driving source as in the case of the original timepiece, the rotational torque of the entire wheel train including a plurality of wheel wheels is measured from the torque extracting member via the torque measuring terminal. Become like
In addition, the rotational torque being measured is calculated one by one by the arithmetic processing means, and the fluctuation state of the rotational torque is displayed or printed as a time series graph, so that, for example, intermittent abnormalities in the rotational torque appear every 60 minutes. If the fluctuation of the rotational torque tends to be repeated in a continuous cycle of 60 minutes, it is possible to determine that there is a defective tooth profile or eccentricity of the gear diameter in the minute wheel constituting the wheel train, so that a defect is reliably detected. Become so.
[0009]
In the rotation torque measuring device for a timepiece of the present invention, it is preferable that the rotation driving means has an acceleration / deceleration means capable of changing a rotation speed.
When the rotational torque is measured while changing the rotational speed stepwise, the higher the rotational speed, the larger the value of the rotational torque. At this time, since the rotational torque due to the dynamic friction at the time of constant speed rotation hardly changes, for example, by calculating the average rotational torque for each rotational speed and plotting these average rotational torques, all the average rotational torques can be calculated. A connected torque curve is obtained, and from this torque curve, it is possible to predict a rotational torque component due to dynamic friction independent of the rotational speed.
In addition, by rotating the wheel train at a high speed, an acceleration test for evaluating durability can be performed.
[0010]
In the rotation torque measuring device for a timepiece of the present invention, the barrel wheel and barrel barrel may be integrally fixed to each other to form a barrel dedicated to the measuring device.
For example, when a timepiece that is being manufactured is extracted from a production line and its rotational torque is measured, the rotational torque may be measured using a barrel wheel and barrel barrel that are originally incorporated in the timepiece. In this method, it is necessary to attach a torque extracting member to the already assembled barrel and to perform the measurement, which is troublesome.
On the other hand, in the present invention, a barrel barrel and a barrel barrel having the same shape as those actually used are provided in a dedicated barrel, and a torque takeout member may be provided in advance in the barrel. The trouble of attaching the torque extracting member to the barrel is not required, and the measuring operation is easily performed.
[0011]
In the rotation torque measuring device for a timepiece of the present invention, the torque measuring terminal is provided with distortion detecting means for detecting distortion of the terminal itself as the mechanical displacement amount and converting the distortion into an electric signal, and the arithmetic processing means comprises: It is preferable to function so as to calculate a torque value based on an electric signal from the detecting means.
In such a configuration, the amount of mechanical displacement of the torque measuring terminal is finally output as an electric signal by the strain detecting means, so that the processing in the arithmetic processing means for calculating the torque value is performed based on the electric signal. As a result, the visual inaccuracy as in the prior art is eliminated, and an expensive device such as an image processing device is not required.
[0012]
In the rotation torque measuring device for a timepiece of the present invention, it is desirable that the torque measuring terminal is locked to the torque extracting member on a side opposite to a pointer attached to a wheel train.
In such a configuration, even when the pointer is attached to the movement, the torque measuring terminal is locked to the torque extracting member without interfering with the pointer, and the torque measurement is reliably performed. For this reason, by attaching the pointer to the movement and performing the torque measurement, the torque can be measured in a state closer to an actual timepiece, and the credibility of the measurement result increases.
[0013]
On the other hand, the rotation torque measuring method for a timepiece according to the present invention is characterized in that the rotation torque is measured by using any one of the above-described measuring devices. The effect is similarly obtained, and the object of the present invention is also achieved.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
(Electronically controlled mechanical clock)
First, a movement of an electronically controlled mechanical timepiece measured by a rotational torque measuring device (hereinafter, also simply referred to as a measuring device) of the present invention will be described with reference to FIGS.
1 is a sectional view schematically showing a movement of an electronically controlled mechanical timepiece, and FIG. 2 is a sectional view taken along line II-II of FIG. 1 (a part of the sectional view taken along line II′-II ′).
[0015]
The electronically controlled mechanical timepiece transmits the mechanical energy stored in the mainspring via a train, drives the generator with the transmitted mechanical energy, generates electric power, and drives the IC with the generated electric power. The driving state of the generator is controlled by this IC, so that the hands attached to the wheel train move accurately.
[0016]
As the movement, specifically, a barrel 1 incorporating a mainspring serving as a mechanical energy source, a second wheel (segmented wheel) 2 meshing with the barrel wheel 1A of the barrel 1, and a second wheel 2 A third wheel & pinion 3 meshing with the third wheel & pinion 3 (second wheel) 4 meshing with the third wheel & pinion 5, a fifth wheel & pinion 5 meshing with the fourth wheel & pinion 4, and a sixth wheel & pinion 6 meshing with the fifth wheel & pinion 5 , A generator 7 including a rotor 7A meshed with the sixth wheel & pinion 6, and a second to sixth wheel & pinion 2 to 6 constitute a wheel train.
[0017]
The generator 7 includes a pair of stators 7B, 7B provided to form an arrangement hole for the rotor 7A, and coils 7C, 7C wound around extensions of the stators 7B, 7B. The coil 7C is electrically connected to an IC (not shown).
[0018]
The IC detects the rotation state of the rotor 7A of the generator 7, compares the detection result with a reference signal generated based on a signal from the quartz oscillator, and applies the detected signal to the rotor 7A according to the rotation of the rotor 7A. The electromagnetic brake is applied so that the minute hand 2C attached to the second wheel & pinion 2, and eventually the second hand 4C attached to the fourth wheel & pinion 4 and the hour hand 8C attached to the hour wheel 8 also accurately function.
[0019]
The barrel 1 here constitutes an actual (actual) movement, and the inner peripheral surface of the barrel car 1A is originally joined to the outer end of the built-in mainspring. And, as the barrel for the measuring device according to the present embodiment, the reference numeral is changed from “1” to “40” and will be described later.
[0020]
[Rotation torque measuring device]
FIG. 3 is a perspective view showing a schematic entirety of the measuring apparatus 10 according to the present embodiment, FIG. 4 is a plan view showing an enlarged main part of the measuring apparatus 10, and FIG. is there. FIGS. 1 and 2 also show a state in which the movement of the electronically controlled mechanical timepiece is set in the measuring device 10.
[0021]
1 to 5, the measuring device 10 includes an apparatus main body 20 having a turntable 20A on an upper portion, an XY table 30 provided on the turntable 20A, a measurement barrel 40 incorporated in a movement, Torque extracting member 50 attached to barrel 40, rod-shaped torque measuring terminal 60 locked to torque extracting member 50, distortion detecting means 70 provided on torque measuring terminal 60, and part of distortion detecting means 70 , A personal computer (hereinafter, referred to as a personal computer as shown in FIG. 5) 90 for arithmetic processing electrically connected to the distortion detecting means 70 and the apparatus main body 20 via a cable. It is generally composed of
The illustration of the personal computer 90 in FIG. 3 is omitted.
[0022]
As shown in FIG. 5, the apparatus main body 20 includes a motor driver (substrate) 21 to which an instruction signal from the personal computer 90 is input, and a rotation driving unit whose rotation is controlled by a control signal generated by the motor driver 21. A motor 22; a tachometer 23 for detecting the rotation speed and the number of rotations of the motor 22 and outputting a feedback signal corresponding to the rotation speed and the number of rotations to a personal computer 90; and accelerating and decelerating the rotation speed of the motor 22 to an appropriate speed. And a switching device 25 such as an electromagnetic clutch for transmitting or interrupting the rotation power from the acceleration / deceleration means 24 to the turntable 20A.
The on / off operation of the motor 22, the setting of the acceleration / deceleration means 24, the operation of the switching device 25, and the like are performed on an operation panel 20 </ b> B provided on a side surface of the apparatus main body 20.
[0023]
The XY table 30 and the XYZ table 80 can slide the sliders by sliding the plurality of sliders along the guide rails in the horizontal direction, or by attaching the sliders to a vertical support member provided with a rack via pinions. It is configured to be slid in the vertical direction, and a commercially available product that is generally used can be applied.
A holding jig 31 for holding the movement is fixed on the XY table 30.
[0024]
The barrel 40 includes a barrel true 41, a barrel wheel 42 adhered to the barrel true 41 via an appropriate fixing member, and a barrel lid 43 for closing the barrel wheel 42 between the main plate A and the barrel holder B. It is supported by. The barrel barrel 41 and barrel barrel 42 have the same shape as the actual barrel barrel and barrel barrel 1A.
Such a barrel 40 is not provided with a mainspring or an hour wheel, and the barrel true 41 and the barrel wheel 42 rotate integrally.
[0025]
The torque extracting member 50 is a plate-shaped member, and has a square hole 51 as shown in FIG. The entire takeout member 50 is fixed to the barrel true 41 with a washer 52 and a screw 53. Therefore, the torque extracting member 50 is fixed to the barrel car 42 via the barrel barrel 41. A notch 54 is provided on the outer peripheral portion of the torque extracting member 50.
The specific shape and the like of the entire torque extracting member 50 are not limited to those shown in FIG.
[0026]
The torque measuring terminal 60 is for measuring the rotational torque of the wheel train output from the torque extracting member 50, and has a notch at the lower end side as shown in FIGS. It is locked on the inner peripheral surface of the portion 54. At this time, the torque measuring terminal 60 is located at a distance of 1 cm from the rotation center C of the barrel wheel 42. Such a torque measuring terminal 60 is distorted and elastically deformed according to the magnitude of the rotational torque.
[0027]
The distortion detecting means 70 detects the distortion of the torque measuring terminal 60 as a mechanical displacement amount, and outputs a voltage corresponding to the distortion amount, and a power supply 72 for applying a measured voltage to the strain gauge 71 (FIG. 5) and a voltmeter 73 that measures an output voltage from the strain gauge 71 and outputs a detection signal corresponding to the output voltage to the personal computer 90.
[0028]
As shown in FIG. 5, the personal computer 90 can set the rotation speed and the number of rotations of the motor 22. An instruction signal output to the motor driver 21 and a feedback signal input from the tachometer 23 Thus, the motor 22 can be rotated at a predetermined rotation speed and a predetermined number of times.
In addition, the personal computer 90 has a data processing function of calculating the rotation torque based on the detection signal input one by one from the voltmeter 73, and displays the fluctuation state of the calculated rotation torque in a time series as a graph on a display or the like. At the same time, the calculated torque value can be stored in an appropriate storage unit.
[0029]
〔Measuring method〕
Hereinafter, a method (procedure) of measuring the rotational torque using the measuring device 10 will be described. First, the barrel 1 of the movement (sample) of the timepiece is replaced with a barrel 40 dedicated to torque measurement to which the torque extracting member 50 is fixed. At this time, it is desirable to assemble the movement with the hands 2C, 4C, 8C attached. Next, such a movement is held by a holding jig 31 and the XY table 30 is operated to perform positioning. This alignment is performed so that the rotation center C of the barrel wheel 42 and the rotation center of the turntable 20A coincide with each other.
[0030]
Thereafter, the XYZ table 80 is operated to adjust the torque measuring terminal 60 to the rotation center C of the barrel wheel 42. Further, from this position, the torque measuring terminal 60 is moved down by 1 cm toward the notch portion 54 of the torque extracting member 50 and lowered, and positioned in the notch portion 54.
[0031]
In this state, the motor 22 is rotated, and the movement is rotated through the acceleration / deceleration means 24. The rotation speed at this time is set to the actual rotation speed of barrel box 1A.
Then, although the whole movement and the train wheel are rotating, the barrel 40 does not rotate, and the torque extracting member 50 is kept in contact with the torque measuring terminal 60 due to the rotating torque in the train wheel. Causes the torque measurement terminal 60 to be distorted.
[0032]
Then, while the torque measuring terminal 60 is distorted, the voltage value from the strain gauge 71 is measured by the voltmeter 73, a detection signal corresponding to the voltage value is taken in by the personal computer 90, and the torque value is calculated and calculated. This calculation is performed by the following equation.
Torque value = (measured voltage value−voltage at no load) × conversion coefficient At this time, the voltage and conversion coefficient at no load are values that are known in advance by calibration of the strain gauge 71 or the like.
[0033]
Further, if necessary, the number of revolutions output from the acceleration / deceleration means 24 is changed stepwise, and the above measurement is repeated. In such a measurement, the personal computer 90 can calculate an average rotation torque and the like for each rotation speed, and output a torque curve with the rotation speed on the horizontal axis and the torque value on the vertical axis from the average rotation torque. is there.
[0034]
The fluctuation state of the rotational torque calculated as described above is displayed as a graph on a display or the like in chronological order, and is printed by a printer or the like, and a defect existing in the train wheel is detected with reference to these.
[0035]
[Effects of Embodiment]
According to the present embodiment, the following effects can be obtained.
(1) In the measuring device 10, since the torque extracting member 50 is attached to the barrel wheel 42, the movement can be rotated around the rotation center C of the barrel wheel 42 by the motor 22, and the rotation of the entire wheel train The torque can be measured from the torque extracting member 50 via the torque measuring terminal 60. Therefore, it is possible to calculate a value closer to the rotation torque generated by the actual electronically controlled mechanical timepiece, and to improve the credibility of the calculated torque value, thereby improving the reliability of the design of the mainspring.
[0036]
(2) Since the rotational torque being measured by the personal computer 90 is calculated one by one, the fluctuation state of the rotational torque is displayed as a time-series graph or printed, so that intermittent abnormalities in the rotational torque can be detected for 12 hours. Every, every 60 minutes, or every 60 seconds, and the periodic fluctuation of the rotation torque is a continuous cycle of 12 hours, or a continuous cycle of 60 minutes, or a continuous cycle of 60 seconds. Can be determined in which cycle is repeated, and which of the hour wheel 8, the second wheel 2 and the fourth wheel 4 has a defective tooth profile or eccentricity of the gear diameter can be determined. , Etc., and can be reliably detected. Also, by taking into account the relationship between the speed increase ratio in the train wheel and the time, an abnormality in the fifth wheel 5 and the sixth wheel 6 can be detected.
[0037]
(3) Further, since the torque measuring terminal 60 is locked to the torque extracting member 50 on the side opposite to the side on which the hands 2C, 4C, 8C are attached, the hands 2C, 4C, 8C are connected. The rotational torque can be reliably measured even in the mounted state, and by performing such a measurement, the measurement can be performed in a state closer to the actual electronically controlled mechanical timepiece, and the mutual interference between the hands 2C, 4C, and 8C can be achieved. Can also be detected.
[0038]
(4) In the measuring device 10, the acceleration / deceleration means 24 can rotate the movement at a rotation speed other than the actual rotation speed of the barrel barrel 1A. Thus, the personal computer 90 can calculate the average rotation torque for each rotation speed, and obtain a torque curve from these average rotation torques. Further, from this torque curve, the rotation torque component due to the dynamic friction independent of the rotation speed can be obtained. Can be predicted.
Furthermore, if the wheel train is rotated at a high speed and an acceleration test is performed, the durability of the wheel train can be evaluated, and problems such as tooth wear and oil flow can be checked.
[0039]
(5) The barrel 40 used for measurement is dedicated to measurement without a built-in mainspring, and is provided with the torque extracting member 50 in advance. Therefore, it is only necessary to replace the barrel with the original barrel 1 of the actual machine. This eliminates the need for attaching the torque extracting member 50 to the original barrel car 1A or fixing the original barrel true and barrel barrel 1A, thereby facilitating the measurement operation.
[0040]
(6) In the measuring device 10, the distortion of the torque measuring terminal 60 is finally output to the personal computer 90 as an electrical detection signal by the distortion detecting means 70 using the strain gauge 71. Can be reliably and immediately executed on the basis of the detection signal, the inaccuracy in visual observation can be eliminated, and an expensive apparatus such as an image processing apparatus can be dispensed with.
[0041]
(7) Further, since the distance from the rotation center C of the barrel car 42 to the torque measurement terminal 60 is set to 1 cm, when calculating the rotation torque in the unit of N · cm, the calculation formula for calculating the rotation torque is used. In this case, the parameter of the distance from the rotation center C to the torque measurement terminal 60 can be substantially eliminated, and the calculation can be performed quickly.
[0042]
(Modification)
Note that the present invention is not limited to the above-described embodiment, but includes other configurations and the like that can achieve the object of the present invention, and includes the following modifications and the like.
For example, in the above-described embodiment, the rotational torque is measured by using the strain detecting means 70. However, as in the related art, a measuring terminal joined to the helical spring is used, and the tip of the measuring terminal is connected to the torque extracting member 50. It may be stopped.
[0043]
In the above-described embodiment, the mainspring 40 used for measurement does not include a mainspring, but a mainspring having characteristics similar to those used in an actual machine may be incorporated in the main barrel 40.
In such a case, since a preload is given to the train wheel by the mainspring, the backlash between the barrel wheel 42, the count wheels 2 to 7 constituting the train wheel, and the rotor 7A can be reduced, and a more actual state can be achieved. It can be measured in a state close to hand movement.
[0044]
In the above-described embodiment, the barrel 40 dedicated to measurement is used. However, the measurement may be performed by attaching the torque extracting member 50 to the barrel 1 of the actual machine.
However, rather than attaching the torque extracting member 50 to the barrel 1, replacing the barrel 1 with the barrel 40 to which the torque extracting member 50 is attached in advance saves time and facilitates setup.
[0045]
In the above embodiment, the case of the electronically controlled mechanical timepiece has been described. However, the measuring device and the measuring method of the present invention can be applied to a conventional mechanical timepiece without a generator. The clock may be any clock driven by a mainspring, such as a table clock or a wall clock, in addition to the arm statistics.
[0047]
Further, the measurement may be performed not only when the movement is in the horizontal state but also in a state where the movement is inclined.
In such a case, the influence of the torque fluctuation due to the movement posture (difference) can be grasped.
[0048]
In addition, the specific configuration of the apparatus main body 20 is not limited to the above-described embodiment, and can be appropriately changed in the implementation.
[0049]
【The invention's effect】
As described above, according to the present invention, there is an effect that the rotational torque of the entire wheel train constituting the timepiece can be measured, and a mechanical defect of uneven hand movement can be reliably detected.
[Brief description of the drawings]
FIG. 1 is a plan view schematically showing a movement of an electronically controlled mechanical timepiece measured by a rotation torque measuring device according to one embodiment of the present invention.
FIG. 2 is a sectional view of the movement.
FIG. 3 is a perspective view schematically showing the whole of the rotation torque measuring device.
FIG. 4 is a plan view showing a main part of the rotation torque measuring device.
FIG. 5 is a block diagram showing the rotation torque measuring device.
[Explanation of symbols]
REFERENCE SIGNS LIST 10 rotation torque measuring device 22 motor 40 as rotation driving means barrel 40 barrel barrel 42 barrel barrel 50 torque extracting member 60 torque measuring terminal 70 distortion detecting means 90 personal computer as arithmetic processing means

Claims (6)

A rotating torque measuring device for a timepiece used for a timepiece having a wheel train driven by mechanical energy of a mainspring,
Rotation drive means for rotating the entire movement incorporating the barrel wheel and the train wheel meshing with the drive source around the barrel true ,
A torque extracting member fixed to the barrel car,
A torque measuring terminal locked to the torque extracting member,
Arithmetic processing means for calculating a torque value based on the amount of mechanical displacement occurring at the torque measuring terminal;
A rotating torque measuring device for a timepiece, comprising: 2. The rotation torque measuring device for a timepiece according to claim 1, wherein said rotation driving means includes an acceleration / deceleration means for varying a rotation speed. 3. The rotating torque measuring device according to claim 1, wherein said barrel wheel and barrel barrel are integrally fixed to each other to form a barrel dedicated to the measuring device. Torque measuring device. 4. The rotational torque measuring device for a timepiece according to claim 1, wherein the torque measuring terminal detects distortion of the terminal itself as the mechanical displacement and converts the distortion into an electric signal. Wherein the arithmetic processing means calculates a torque value based on an electric signal from the distortion detecting means. 5. The rotation torque measuring device for a timepiece according to claim 1, wherein the torque measuring terminal is locked to the torque extracting member on a side opposite to a pointer attached to a wheel train. Clock rotation torque measuring device. A timepiece rotation torque measuring method, comprising: measuring a timepiece torque using the timepiece torque measurement apparatus according to claim 1.

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