GB2370120A - Noise-cancelling belt tension measuring device - Google Patents
Noise-cancelling belt tension measuring device Download PDFInfo
- Publication number
- GB2370120A GB2370120A GB0118766A GB0118766A GB2370120A GB 2370120 A GB2370120 A GB 2370120A GB 0118766 A GB0118766 A GB 0118766A GB 0118766 A GB0118766 A GB 0118766A GB 2370120 A GB2370120 A GB 2370120A
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- GB
- United Kingdom
- Prior art keywords
- belt
- measuring device
- vibrating
- tension measuring
- belt tension
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
- G01L5/042—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands by measuring vibrational characteristics of the flexible member
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
A belt tension measuring device includes a sensor part 11 and a body part 12 electrically connected together. The sensor part 11 has two microphones 11b and 11c directed outward away from each other in diametrically opposite directions. A belt B stretched between two pulleys Pa and Pb is caused to vibrate. In this instance, the microphone 11b disposed close to and facing toward the belt B collects both the vibrating sound of the belt B and an ambient noise, while the microphone 11c disposed relatively far distant from and directed away from the belt B is insensitive to the vibrating sound of the belt B and collects the ambient noise only. An input from the microphone 11c is subtracted from an input from the microphone 11b to remove the ambient noise. A frequency of the vibrating sound is measured and displaced either directly or in the form of a belt tension calculated from the measured vibrating frequency. A belt-striking hammer (15, fig 2) is attached to the microphone assembly.
Description
BELT TENSION MEASURING DEVICE
The present invention relates to a belt tension measuring device wherein a vibrating sound generated when a belt stretched 5 between two pulleys is caused to vibrate is collected by a microphone, and a frequency of the vibrating sound is measured and displayed either directly or in the form of a belt tension calculated from the measured frequency of the vibrating sound.
Various belt tension measuring devices of the type 10 concerned are known heretofore.
One example of such conventional belt tension measuring devices is shown in FIG. 5. As shown in this figure, the conventional belt tension measuring device includes a sensor part 1, a body part 2 and a flexible tube 4 which supports the 15 sensor part 1 with respect to the body part 2 and holds therein a microphone cord 3. The sensor part 1 has a sensor body la and a single microphone lb disposed on the sensor body la. The body part 2 contains within it an amplifier, a frequency measuring circuit, a tension calculating circuit, a display circuit and a 20 power supply (neither show). On a front side of the body portion 2, there are provided a display portion 2a for indicating a frequency f (Hz) or a tension T (N or kgF), a power button 2b and a display selector button 2c.
The conventional belt tension measuring device shown in 25 FIG. 5 is used to measure a tension of a belt B in a manner as described below. While supporting the body part 2 of the device with its one hand, the operator holds with its other hand the
- microphone lb at a position close to the middle of a back side of the belt B stretched between two pulleys Pa, Pb. While keeping this condition, the operator touches the belt B with, for example, a finger of the other hand so that the belt B is 5 caused to vibrate. A vibrating sound, which is generated from the vibrating belt B. is collected by the microphone lb to measure the frequency f of the vibrating sound. A measured frequency f of the vibrating sound is displayed either directly or in the form of a belt tension T calculated from the measured 10 frequency f.
FIGS. 6A and 6B show another conventional belt tension measuring device, which includes a sensor part 1, a body part 2 (FIG. 6A) and a microphone cord 3. As shown in detail in FIG. 6B, the sensor part la has a generally U-shaped configuration 15 with a recess or groove lc formed centrally therein and is provided with two microphones id and le disposed in confrontation across the groove lc. The body part 2 contains within it an amplifier, a frequency measuring circuit, a tension calculating circuit, a display circuit and a power supply 20 (neither shown). A display portion 2a for indicating a frequency f (Hz) or a tension T (N or kgF), a power button 2b and a display selector button 2c are provided on a front side of the body part 2.
The conventional belt tension measuring device is used 25 for measuring the tension of a belt B in a manner as described below. The operator supports the sensor part 1 with its one hand in such a manner that the Ushaped sensor part 1 is placed
-3- astride the edge of a middle portion of the belt B stretched between two Pulleys Pa, Pb, as shown in FIGS. 6A and 6B. While keeping this condition, the operator touches the belt B with, for example, a finger OI the other hand, so that the belt B is 5 caused to vibrate. A vibrating sound, which is generated from the vibrating belt B. is collected by the microphones Id, lc and a frequency f of the vibrating sound is measured The measured frequency f of the vibrating sound is displayed on the display portion 2a either directly or in the form of a belt tension T 10 calculated from the measured frequency f. In this instance, an input from one microphone le is subtracted from an input from the other microphone Id so that the effect of external noises is removed. Thus, the frequency f of vibrating sound which is free from the external noises is provided for the measurement of 15 the belt tension.
However, the conventional belt tension measuring device shown in FIG. 5 may cause an error when subjected to a noise generated from another machine during measurement. To deal with this problem, a system has been realized in which only a damped 20 waveform of the vibrating sound is taken or extracted for the measurement of vibrating frequency f. This system still has a drawback, however, that the effect of external noises cannot be removed to a sufficient degree, and a complicated and cost increasing circuit is required.
25 The conventional belt tension measuring device shown in FIGS. 6A and 6B also has a problem that the U-shaped sensor part 1 is relatively large in size and cannot be used when the belt
-4- B is disposed in a relatively small space. Additionally, since the microphones id, le are held on opposite sides of the belt B in the direction of the thickness of the belt 0, the measured value is likely to deviate from a correct value when torsional 5 vibration or an irregular tension distribution occurs in the case of a belt having a relatively large width.
Furthermore, since the conventional belt tension measuring devices cannot be handled by one hand of the operator.
Stated more specifically, one hand of the operator is used for 10 supporting the body part 2 or the sensor part, and at the same time, a finger of the other hand of the operator is used to vibrate the belt B. Thus, the efficiency of the measurement is relatively low.
It is accordingly a basic object of the present invention 15 to provide a belt tension measuring device which is able to overcome the drawbacks of the conventional devices" A more specific object of the present invention seeks to provide a belt tension measuring device which can almost completely remove the effect of ambient noises, is able to 20 measure the belt tension with high accuracy (with least error), can be manufactured less costly, and is easy to manipulate.
To achieve the foregoing objects, according to the present invention, there is provided a belt tension measuring device wherein a vibrating sound generated when a belt stretched 25 between pulleys is caused to vibrate is collected by a microphone, and a vibrating frequency of the collected vibrating sound is measured and displayed either directly or in the form
of a belt tension calculated from the measured vibrating frequency, characterized in that the belt tension measuring device comprises a sensor part, a body part and a microphone cord, and the sensor part is provided with two microphones 5 directed outward away from each other in diametrically opposite directions. If a vibrating pressure (sound pressure) generated by vibration of the belt is P. a vibrating pressure (sound pressure) of an ambient noise is p, and voltages generated from 10 two microphones are E and e, a first microphones, which is disposed close to and directed toward the vibrating belt, picks up a vibrating pressure (sound pressure) P+p and thus generates a voltage E+e, while a second microphone, which is disposed relatively far away from and directed away from the vibrating 15 belt, is substantially insensitive to the vibrating pressure (sound pressure) caused due to vibration of the belt and thus generates a voltage e. The circuitry of the belt tension measuring device is arranged such that the output voltage of the second microphone is subtracted from the output voltage of the 20 first microphone to produce a voltage signal to be supplied as an input signal to a frequency measuring circuit. With this arrangement, since the input voltage of the frequency measuring circuit is E+e-e=E, it is possible for the frequency measuring circuit to measure only a vibrating frequency f which is 25 substantially free from the effect of the ambient noise. The measured vibrating frequency f is displayed either directly or in the form of a belt tension T calculated from the measured
-6- vibration frequency In one preferred form of the present invention, the belt tension measuring device further comprises a flexible tube which supports the sensor part with respect to the body part and holds 5 therein the microphone cord, and a belt striking hammer secured to a body of the sensor part in such a manner that the belt striking hammer projects outward from a front face of one of the microphones In order to measure a belt tension/ the operator hits the 10 belt striking hammer against the belt while supporting the body part of the device with its one hand By thus striking the belt, the belt generates stable vibration which will insure a measurement with high repeatability. The belt tension measuring device can be handled with only one hand of the operator, and 15 the efficiency of the measurement is relatively high.
In another preferred form of the present invention, the belt tension measuring device further comprises a flexible tube which supports the sensor part with respect to the body part and holds therein the microphone cord, a belt striking hammer 20 reciprocally mounted on a body of the sensor part in such a manner as to project outward from a front face of one of the microphones, and an actuator for moving the belt striking hammer back and forth.
In order to measure a belt tension, the operator supports 25 the body part of the device with its one hand and manipulates the actuator to drive or force the belt striking hammer against the belt. By thus striking the belt, the belt is caused to
vibrate stably. This enables a measurement with high repeatability. The belt tension measuring device can be manipulated with one hand of the operator and, hence, the measurement with high.efficiency.
5 The above and other objects, features and advantages of the present invention will become manifest to those versed in the art upon making reference to the following description and
accompanying sheets of drawings in which certain preferred structural embodiments incorporating the principle of the 10 invention are shown by way of illustrative example FIG. 1 is a diagrammatical view showing the manner in which a belt tension measuring device according to a first embodiment of the present invention is used for measuring the tension of a belt stretched between two pulleys, 15 FIG. 2 is a diagrammatical view showing the manner in which a belt tension measuring device according to a second embodiment of the present invention is used for measuring the tension of a belt stretched between two pulleys; FIG. 3 is a diagrammatical view showing the manner in 20 which a belt tension measuring device according to a third embodiment of the present invention is used for measuring the tension of a belt stretched between two pulleys; FIG. 4 is a diagrammatical view showing the manner in which a belt tension measuring device according to a fourth 25 embodiment of the present invention is used for measuring the tension of a belt stretched between two pulleys; FIG. 5 is a diagrammatical view showing the manner in
-8- which a conventional belt tension measuring device is used for measuring the tension of a belt stretched between two pulleys; FIG. 6A is a diagrammatical view showing the manner in which another conventional belt tension measuring device is used 5 for measuring the tension of a belt stretched between two pulleys; and FIG. 6B is a cross-sectional view taken along the line X-X of FIG. 5A.
The following description is merely exemplary in nature
10 and is in no way intended to limit the invention or its application or use.
Referring now to the drawings and FIG. 1 in particular, there is shown a belt tension measuring device according to a first embodiment of the present invention, the device being in 15 a position for measuring a vibrating frequency or a tension of a belt B stretched between two pulleys Pa, Pb.
The belt tension measuring device is comprised of a sensor part 11, a body part 12 and a flexible tube 13 which supports the sensor part 11 with respect to the body part 12 and 20 holds therein a microphone cord 13. The sensor part 11 includes a sensor body lla and two microphones lib, Tic disposed on the sensor body lla. The microphones 11b, Tic are directed outward away from each other and faced in diametrically opposite directions The body part 12 contains within it an amplifier, 25 a frequency measuring circuit, a tension calculating circuit, a display circuit and a power supply (neither shown). A display portion 12a, a power switch or button 12b and a display selector
_9_ switch or button 12c for selectively displaying a frequency f (Hz) and a tension T (N or kgF) are provided on a front side of the body part 12. The frequency measuring circuit is arranged such that an input from the microphone llb and an input from the 5 microphone llc are electrically subtracted one from another so as to measure the frequency of a vibrating sound of the belt B. The flexible tube 14 has a stiffness such that the tube 14 does not.undergo deformation unless an external force applied to the tube 14 is greater than a predetermined value.
10 The belt tension measuring device shown in FIG. 1 is used to measure the tension of the belt B in a manner, as described below. The operator supports with its one hand the body part 12 in such a way that one microphone llb is disposed close to and faced toward a middle portion of the back side of the belt B 15 stretched between the pulleys Pa, Pb. While keeping this condition, the operator touches the belt B with, for example, a finger of the other hand to vibrate the belt B. In this instance, the microphone lib, which is disposed close to and directed toward the belt B. collects both a vibrating sound of 20 the vibrating belt B and an external noise, whereas the other microphone llc, which is faced in the opposite direction from the microphone lib, collects the external noise but is substantially insensitive to the vibrating sound of the belt B. 25 If a vibrating pressure (sound pressure) generated by vibration of the belt B is P. a vibrating pressure (sound pressure) of an ambient noise is p, and voltages generated from
- 1 0-
the two microphones lib, tic are E and e, the microphones lib, which is disposed close to and directed toward the vibrating belt B. picks up a vibrating pressure (sound-pressure) P+p and thus generates a voltage E+e, wh le the microphone llc, which is 5 disposed relatively far distant from and directed away from the vibrating belt B. is substantially insensitive to the vibrating pressure (sound pressure) produced by vibration of the belt B and thus generates a voltage e. The circuitry of the belt tension measuring device is arranged such that the output 10 voltage of the microphone tic is subtracted from the output voltage of the microphone llb to thereby produce a voltage signal to be supplied as an input signal to the frequency measuring circuit. With this arrangement, since the input voltage of the frequency measuring circuit is E+e-e=E, this 15 means that a vibrating frequency f substantially free from the effect of ambient noise is provided for the measurement achieved at the frequency measuring circuit.
It is known that the vibrating frequency f and the belt tension have a correlation represented by the following 20 expression T-A+B L2m where A and B are constants determined by the cross-section and composition, respectively, of the belt, L is the belt length between fixed ends, and m is the mass of belt per unit length.
25 Accordingly, by setting A, B. L and m in advance, the tension calculating circuit can obtain a tension T of the vibrating belt B through calculation using the foregoing
expression based on the measured vibrating frequency f supplied from the frequency measuring circuit.
The vibrating frequency f (Hz) or the belt tension T (N or kgF) is displaced on the display portion 12a depending on the 5 position of the display selector button 12c.
The belt tension measuring device shown in FIG. 1 has various advantages, as enumerated below.
!' (1) Since the two microphones lib, llc are arranged such that one microphone disposed close to and directed toward the 10 back side of the belt B being vibrating collects both a vibrating sound of the belt and an ambient noise, and the other microphone faced in the opposite direction from the first microphone collects the ambient noise only, it is possible to completely remove the effect of ambient noise by subtraction 15 made electrically between inputs of the two microphones.
(2) The sensor part 11 is smaller in size than the conventional U-shaped sensor part 1 equipped with two microphones such as shown in FIGS. 6A and 6B. This enables use of the belt tension measuring device even when the belt is 20 disposed in a relatively small space.
(3) Since the conventional U-shaped sensor part l shown in FIGS. 6A and 6B is placed astride one longitudinal edge of the belt, a measurement error may occur due to torsional vibration or an irregular tension distribution caused when the 25 width of the belt is relatively large. As against this, the sensor part 11 of the belt tension measuring device shown in FIG. 1 can be placed at any position relative to the belt so
-12 that the measurement is achieved with least errox.
(4) The device shown in FIG. 1 is able to remove the effect of an ambient noise at a higher degree of reliability than the conventional system wherein an input from a single 5 microphone is processed for removing the ambient noise. With the ambient noise thus removed, the result of measurement of the device shown in FIG. 1 is highly accurate.
(5) As compared to the conventional system mentioned in the preceding paragraph (4), the circuitry of the belt tension 10 measuring device shown in FIG. 1 is simple in construction and hardly causes an operation failure.
FIG. 2 shows the manner in which a belt tension measuring device according to a second embodiment of the present invention is used for measuring the tension of a belt B stretched between 15 two pulleys Pa, Pb. The bent tension measuring device is substantially the same as the device shown in FIG. 1 with the exception that a belt striking hammer 15 is secured to a sensor body lla of a sensor part 11 such a manner that the hammer 15 projects outward from a front face of one microphone llb adapted 20 to be faced toward the back side of the belt B. Other parts of the belt tension measuring device are the same as those shown in FIG. 1, and a further description thereof can be omitted.
The belt tension measuring device shown in FIG. 2 is used in a manner, as described below. While supporting the body part 25 12 with its one hand, the operator forces the belt striking hammer 12 to strike a middle portion of the back side of the belt B. By thus striking the belt B. the belt B is caused to
-13 vibrate with a vibrating frequency. The flexible tube 14 of the device has a stiffness determined such that the tube 14 does not undergo deformation even when subjected to a reaction force produced when the belt striking hammer 15 is struck against the 5 belt B. Collection of a vibrating sound and/or an ambient noise by the microphones lib, llc, measurement of a vibrating frequency f of the vibrating sound, calculation of a belt tension T. and display of the vibrating frequency f or the belt 10 tension T are achieved in the same manner as described above with respect to the first embodiment shown in FIG. 1, and a further description thereof can be omitted.
The belt tension measuring device shown in FIG. 2 is advantageous in that by virtue of the belt striking hammer 15 15 secured to the sensor body lla in such a manner as to project outward from the front face of the microphone llb faced toward the belt B. it is possible to vibrate the belt B by striking the belt striking hammer 15 against the middle portion of the back side of the belt B while the body part 12 of the device is held 20 with one hand of the operator. By thus striking the belt B. the belt B generates stable vibration which will insure a measurement with improved repeatability. The device can be manipulated with one hand of the operator and, hence, the measurement can be achieved with high efficiency.
25 FIG, 3 shows the manner in which a belt tension measuring device according to a third embodiment of the present invention is used for measuring the tension of a belt B stretched between
-14- two pulleys Pa, Pb. The bent tension measuring device includes a belt striking hammer 15 reciprocally mounted on a sensor body lla via a guide pin 15a, a wire 16 connected at one end to the guide pin 15a, a lever 17 pivotally mounted to the sensor body 5 lla and securely connected to the other end of the wire 16, and a compression coil spring 18 disposed between the belt striking hammer 15 and the sensor body lla. The belt striking hammer 15 projects outward from a front face of one microphone llb adapted to be faced toward the back side of the belt B. The wire 16 10 extends through a flexible tube 14. The flexible tube 14 supports the sensor 11 with respect to a body part 12 of the device, The wire 16, the lever 17 and the spring 18 jointly form an actuator for moving the belt striking hammer 15 back and forth. 15 As will be understood from the foregoing description/ the
belt tension measuring device shown in FIG. 3 differs from the device of FIG. 1 only in that the belt striking hammer 15 is reciprocally mounted on the sensor body lla, and the actuator 16-18 is provided for moving the belt striking hammer 15 back 20 and forth. Though not shown for clarity, a microphone cord is received inside the flexible tube 14. Other parts of the belt tension measuring device are the same as those shown in FIG. 1, and a further description thereof can be omitted.
The belt tension measuring device shown in FIG. 3 is used 25 in a manner, as described below. The operator supports the body part 12 with its one hand in such a manner that the sensor part 11 is disposed in proximity to a middle portion of the back side
-15 of the belt B stretched between the pulleys Pa, Pb. While keeping this condition, the operator manipulates the lever 17 to turn clockwise in FIG. 3 by using the thumb of the same hand.
The belt striking hammer 15 is Ohms moved backward against the 5 force of the compression coil spring 18. Then the operator releases the lever 17, allowing the spring 18 to spring back to restore its original shape whereupon the belt striking hammer 15 is forced by the force of the spring 18 to strike the middle portion of the back side of the belt B. The belt B is thus 10 caused to vibrate with a vibrating frequency. The flexible tube 14 of the device has a stiffness determined such that the tube 14 does not undergo deformation even when subjected to a reaction force produced when the belt striking hammer 15 strikes the belt B. 15 Collection of a vibrating sound and/or an ambient noise by the microphones lib, tic, measurement of a vibrating frequency f of the vibrating sound, calculation of a belt tension T. and display of the vibrating frequency f or the belt tension T are achieved in the same manner as described above 20 with respect to the first embodiment shown in FIG. 1, and a further description thereof can be omitted.
The belt tension measuring device shown in FIG. 3 is advantageous in that since the belt striking hammer 15 can be driven to strike the belt B merely by manipulating the lever 17 25 with the thumb of one hand of the operator while the body part 12 of the device is supported by the same hand. This enables the belt B to generate stable vibration which will insure a
-16 measurement with improved repeatability The device can be handled with one hand of the operator so that the measurement is achieved with improved efficiency.
FIG. 4 shows the manner in which a belt tension measuring 5 device according to a fourth embodiment of the present invention is used for the measurement of the tension of a belt B stretched between two pulleys Pa, Pb. The bent tension measuring device includes a belt striking hammer 15 reciprocally mounted on a sensor body lla via a guide pin 15a, an electric solenoid (i.e., 10 an electrically energized coil) 19 mounted to a sensor body lla of the sensor part 11, and a permanent magnet 20 attached to the belt striking hammer 15 and disposed in faced relation to the solenoid 19. Though not shown for clarity, a solenoid cord is received in and extends through a flexible tube 14 so as to 15 electrically interconnect the solenoid 19 and a solenoid power switch or button 12d provided on a front face of the body part 12. Magnetic poles of the magnet 20 are oriented such that when the solenoid 19 is energized by passing an electric current through it, the magnet 20 and the solenoid 19 repulse each 20 other. The solenoid 19 and the magnet 20 electrically connected to the solenoid power button 12d jointly form an actuator for moving the belt striking hammer 15 back and force. Other parts of the belt tension measuring device are the same as those shown in FIG. 1, and a further description thereof can be omitted.
25 The belt tension measuring device shown in FIG. is used in a manner, as described below. The operator supports the body part 12 with its one hand in such a manner that the sensor part
-17 11 is disposed in proximity to a middle portion of the back side of the belt B stretched between the pulleys Pa, Pb. While keeping this condition, the operator depresses the solenoid power button 12d with the thumb of the same hand to thereby 5 energize the solenoid 19. Upon energization of the solenoid 19, the magnet 20 repels from the solenoid 19, thereby forcing the belt striking hammer 45 to strike the middle portion of the back side of the belt B. By thus striking the belt B. the belt B is able to vibrate stably at a vibrating frequency. The flexible 10 tube 14 of the device has a stiffness determined such that the tube 14 does not undergo deformation even when subjected to a reaction force produced when the belt striking hammer 15 strikes the belt B. Collection of a vibrating sound and/or an ambient noise 15 by the microphones lib, llc, measurement of a vibrating frequency f of the vibrating sound, calculation of a belt tension T. and display of the vibrating frequency f or the belt tension T are achieved in the same manner as described above with respect to the first embodiment shown in FIG. 1, and a 20 further description thereof can be omitted.
The belt tension measuring device shown in FIG. 4 is advantageous in that by virtue of the actuator composed of the solenoid 19 and the magnet 20, the belt striking hammer 15 can be driven to strike the belt B merely by depressing the solenoid 25 power button 12d with the thumb of one hand of the operator while the body part 12 of the device is supported by the same hand. By thus striking the belt B. it is possible to produce
-18 stable vibration of the belt B. This improves the repeatability of the measurement. Additionally, the device can be handled with one hand of the operator so that the measurement can be achieved highly efficiently.
5 In the first embodiment shown in FIG. 1, the flexible tube 14 may be omitted. In the third and fourth embodiments shown in FIGS. 3 and 4, respectively, the actuator for reciprocating the belt striking hammer back and force may be a mechanical actuator having a link mechanism, a pneumatic 10 actuator, a magnetic actuator, an electromagnetic actuator, or a combination thereof.
Claims (5)
1. A belt tension measuring device wherein a vibrating sound generated when a belt stretched between pulleys is caused 5 to vibrate is collected by a microphone, and a vibrating frequency of the collected vibrating sound is measured and displayed either directly or in the form of a belt tension calculated from the measured vibrating frequency, characterized in that the belt tension measuring device comprises a sensor 10 part, a body part and a microphone cord, the sensor part being provided with two microphones directed outward away from each other in diametrically opposite directions.
2. The belt tension measuring device according to claim 15 1, further comprising a flexible tube which supports the sensor part with respect to the body part and holds therein the microphone cord, and a belt striking hammer secured to a body of the sensor part in such a manner as to project outward from a front face of one of the microphones.
20,
3. The belt tension measuring device according to claim 1, further comprising a flexible tube which supports the sensor part with respect to the body part and holds therein the microphone cord, a belt striking hammer reciprocally mounted on 25 a body of the sensor part in such a manner as to normally project from outward from a front face of one of the microphones, and an actuator for moving the belt striking hammer
-20 back and forth.
4. The belt tension measuring device according to claim 3, wherein the belt striking hammer is reciprocally mounted on 5 the sensor body via a guide pin, and the actuator includes a wire connected at one end to the guide pin, a lever pivotally mounted to the sensor body and firmly connected to the other end Off the wire, and a compression coil spring disposed between the belt striking hammer and the sensor body
5. The belt tension measuring device according to claim 3, wherein the belt striking hammer is reciprocally mounted on the sensor body via a guide pin, and the actuator includes an electric solenoid mounted to the sensor body, and a permanent 15 magnet attached to the belt striking hammer and disposed in faced relation to the solenoid, the magnet having magnetic poles oriented such that when the solenoid is energized, the solenoid and the magnet repulse each other.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000233427A JP2002048660A (en) | 2000-08-01 | 2000-08-01 | Belt tension measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0118766D0 GB0118766D0 (en) | 2001-09-26 |
| GB2370120A true GB2370120A (en) | 2002-06-19 |
Family
ID=18725946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0118766A Withdrawn GB2370120A (en) | 2000-08-01 | 2001-08-01 | Noise-cancelling belt tension measuring device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2002048660A (en) |
| GB (1) | GB2370120A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004011893A1 (en) * | 2002-07-25 | 2004-02-05 | Takanori Nakamura | Device and method for measuring axial force of bolt |
| WO2014058952A1 (en) | 2012-10-10 | 2014-04-17 | Bosch Automotive Service Solutions Llc | A method and system for measuring belt tension |
| EP2803589A1 (en) * | 2013-05-16 | 2014-11-19 | Krones Aktiengesellschaft | Method and device for the preparation of strapping bindings and measuring assembly for detecting a tape tension of such strapping bindings |
| CN109211455A (en) * | 2017-11-22 | 2019-01-15 | 中国航空工业集团公司北京航空精密机械研究所 | A kind of measurement method, system and the equipment of synchronous belt tensile force |
| US20210183227A1 (en) * | 2015-09-25 | 2021-06-17 | Conservation Labs, Inc. | Sound monitoring system |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4936674B2 (en) * | 2005-02-15 | 2012-05-23 | 株式会社ショーワ | Tension measuring device and tension measuring method |
| JP4846283B2 (en) * | 2005-07-04 | 2011-12-28 | 三ツ星ベルト株式会社 | Belt tension measuring device, belt tension measuring method, and program |
| WO2014021506A1 (en) * | 2012-08-03 | 2014-02-06 | 에스피엑스코리아 주식회사 | Belt tension measuring apparatus |
| KR102291146B1 (en) * | 2020-03-04 | 2021-08-20 | 에이아이시스템즈 주식회사 | Apparatus for measuring tention of belt |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1987005699A1 (en) * | 1986-03-12 | 1987-09-24 | James Stonehouse Burdess | Monitoring tension in an elongate flexible member |
| FR2671403A1 (en) * | 1991-01-07 | 1992-07-10 | Renault Automation | Method for continuous measurement of the tension of a belt, and measurement device allowing implementation of the method |
| JPH08178771A (en) * | 1994-12-20 | 1996-07-12 | Mitsuboshi Belting Ltd | Tension measuring device |
-
2000
- 2000-08-01 JP JP2000233427A patent/JP2002048660A/en active Pending
-
2001
- 2001-08-01 GB GB0118766A patent/GB2370120A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1987005699A1 (en) * | 1986-03-12 | 1987-09-24 | James Stonehouse Burdess | Monitoring tension in an elongate flexible member |
| FR2671403A1 (en) * | 1991-01-07 | 1992-07-10 | Renault Automation | Method for continuous measurement of the tension of a belt, and measurement device allowing implementation of the method |
| JPH08178771A (en) * | 1994-12-20 | 1996-07-12 | Mitsuboshi Belting Ltd | Tension measuring device |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004011893A1 (en) * | 2002-07-25 | 2004-02-05 | Takanori Nakamura | Device and method for measuring axial force of bolt |
| JPWO2004011893A1 (en) * | 2002-07-25 | 2005-11-24 | 敬徳 中村 | Bolt axial force measuring instrument and method |
| US7152475B2 (en) | 2002-07-25 | 2006-12-26 | Takanori Nakamura | Device and method for measuring axial force of bolt |
| JP4916111B2 (en) * | 2002-07-25 | 2012-04-11 | 敬徳 中村 | Bolt axial force measuring instrument and method |
| WO2014058952A1 (en) | 2012-10-10 | 2014-04-17 | Bosch Automotive Service Solutions Llc | A method and system for measuring belt tension |
| CN104870957A (en) * | 2012-10-10 | 2015-08-26 | 博世汽车服务解决方案公司 | A method and system for measuring belt tension |
| EP2906921A4 (en) * | 2012-10-10 | 2016-07-13 | Bosch Automotive Service Solutions Inc | A method and system for measuring belt tension |
| CN104870957B (en) * | 2012-10-10 | 2017-09-19 | 博世汽车服务解决方案公司 | Method and system for measuring belt tension |
| EP2803589A1 (en) * | 2013-05-16 | 2014-11-19 | Krones Aktiengesellschaft | Method and device for the preparation of strapping bindings and measuring assembly for detecting a tape tension of such strapping bindings |
| US20210183227A1 (en) * | 2015-09-25 | 2021-06-17 | Conservation Labs, Inc. | Sound monitoring system |
| CN109211455A (en) * | 2017-11-22 | 2019-01-15 | 中国航空工业集团公司北京航空精密机械研究所 | A kind of measurement method, system and the equipment of synchronous belt tensile force |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002048660A (en) | 2002-02-15 |
| GB0118766D0 (en) | 2001-09-26 |
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