JP2005069985A - Inspection device for vibration characteristics - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple inspection device for vibration characteristics for precisely obtaining vibration inspection results of an object to be measured, as soon as possible. <P>SOLUTION: The inspection device 1 for vibration characteristics excites the object 10 by an excitation means 4; analyzes each of detected signals from one or a plurality of vibration sensors 6 mounted on objective portions, which configure the object 10, by a vibration analyzing means 7; and inspects the vibration characteristics of the object 10. The excitation means 4 includes a rod (contained in a rod portion 41), mechanically transmitting the vibration of an excitation source to the proper locations of the object 10. The rod has a natural frequency thereof which is higher than natural frequency of each of the objective portions on the object 10. Consequently, the effect of vibration characteristics of the rod to the vibration characteristics (i.e., natural frequencies) of the object 10 is easily discriminated, and then the inspection results of the vibration characteristics of the object 10 can be precisely obtained as soon as possible. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the present invention, the object to be measured is vibrated, and each detection signal from a vibration sensor attached to one or a plurality of measurement target parts constituting the object to be measured is analyzed by vibration analysis means. The present invention relates to a vibration characteristic inspection apparatus for inspecting vibration characteristics.

  Conventionally, a vibration inspection is generally performed before a product prototype process or before shipment. In particular, when the natural vibrations of the members that make up the product cause vibrations that exceed the allowable level, measures such as adopting a damping structure or attaching damping members from the standpoint of maintaining product quality, etc. Is required. As such a vibration characteristic inspection device, a vibration device that generates sinusoidal vibrations at a plurality of types of frequencies is known. This vibration device includes a commercially available vibration rod for mechanically transmitting sinusoidal vibration from a vibration source to a product as an object to be measured. This vibration characteristic inspection apparatus has a vibration sensor attached to one or a plurality of required members constituting the product, and detects and analyzes the detection signal from each vibration sensor to detect the vibration characteristic of the product. An FFT (Fast Fourier Transform) analyzer, which is an analysis means, is employed. In addition, a stainless steel rod having a diameter of 8 mm and a length of 300 mm is exclusively used as the vibration rod.

  The vibration rod transmits vibrations from the vibration source to the product, but at the same time, the vibration rod itself is excited at the natural frequency, and this vibration is transmitted to the product side. The frequency becomes a problem in vibration inspection. In other words, since a conventional vibration rod having a fixed diameter and length is adopted, depending on the type of the object to be measured, the vibration rod is within various natural frequency ranges of the vibration measurement site in the product. In some cases, its own natural frequency is mixed, and in this case, it is difficult to determine whether the vibration is from a product. In particular, when the product is a photographic processing apparatus, each component constituting this apparatus has a natural frequency of 2000 Hz or less, while a commercially available excitation rod is made of stainless steel having a diameter of 8 mm and a length of 300 mm, and its natural resonance frequency. Is in the vicinity of 212 Hz, 375 Hz, and 625 Hz, the natural frequency of the excitation rod is included in the frequency band of the inspection range for the photographic processing apparatus.

  In order to solve the above-described problems, an object of the present invention is to provide a simple vibration characteristic inspection apparatus that obtains a vibration inspection result of an object to be measured as accurately as possible.

  According to the first aspect of the present invention, the object to be measured is vibrated by the vibration means, and each detection signal from the vibration sensor attached to one or a plurality of measurement target parts constituting the object to be measured is vibration analysis means. The vibration characteristic inspection apparatus for analyzing the vibration characteristic of the object to be measured by analyzing the vibration source, wherein the vibration means includes a rod-like body that mechanically transmits the vibration of the vibration source to an appropriate position of the object to be measured. The rod-like body is characterized in that the natural frequency is higher than the natural frequency of each measurement target portion of the object to be measured.

  According to a second aspect of the present invention, in the vibration characteristic inspection apparatus according to the first aspect, the rod-shaped body is made of a piano wire.

  According to a third aspect of the present invention, in the vibration characteristic inspection apparatus according to the first or second aspect, the length of the rod-shaped body is approximately when all of the natural frequencies of the measurement target portion are 2000 Hz or less. The diameter is 100 mm or less and the diameter is approximately 4.5 mm or more.

  According to a fourth aspect of the present invention, in the vibration characteristic inspection apparatus according to the first or second aspect, the rod-shaped body has a length of approximately when the natural frequency of the measurement target portion is 2000 Hz or less. It is 80 mm or less and has a diameter satisfying approximately 4.0 mm or more.

  According to a fifth aspect of the present invention, in the vibration characteristic inspection apparatus according to the first or second aspect, the length of the rod-shaped body is approximately when the natural frequency of the measurement target portion is 2000 Hz or less. The diameter is 50 mm or less and the diameter satisfies about 2.9 mm or more.

  A sixth aspect of the present invention is the vibration characteristic inspection apparatus according to any one of the first to fifth aspects, further comprising a pair of fixtures that fix and support the rod-like body at both ends, and at least one of the fixtures is The fixing part of the rod-shaped body can be changed.

  According to the first aspect of the present invention, the object to be measured is vibrated by the vibration means, and each detection signal from the vibration sensor attached to one or a plurality of measurement target parts constituting the object to be measured vibrates. It is taken out and analyzed by the analyzing means, and the vibration characteristic of the object to be measured is inspected. In this case, the vibration of the excitation source is mechanically transmitted to a proper position of the object to be measured through the rod-shaped body. Since the rod-shaped body has a natural frequency higher than the natural frequency of each measurement target portion of the object to be measured, the resonance vibration of the rod-shaped body generated during the vibration during the inspection occurs in the object to be measured. Even if it is transmitted, it becomes possible to easily identify or separate, thereby obtaining as accurate an inspection result as possible.

  According to invention of Claim 2, since the said rod-shaped body consists of a piano wire, the rod-shaped body of a required length dimension can be obtained easily.

  According to the invention described in claim 3, when all the natural frequencies of the measurement target part are 2000 Hz or less, the piano wire that has a length of about 100 mm or less and a diameter of about 4.5 mm or more is obtained. Since the natural frequency is 2000 Hz or more, it is easy to determine whether the detection signal is a vibration signal of the rod-shaped body itself.

  According to the fourth aspect of the present invention, when all the natural frequencies of the measurement target part are 2000 Hz or less, the piano wire satisfying a length of about 80 mm or less and a diameter of about 4.0 mm or more is obtained. Since the natural frequency is 2000 Hz or more, it is easy to determine whether the detection signal is a vibration signal of the rod-shaped body itself.

  According to the invention described in claim 5, when all of the natural frequencies of the measurement target part are 2000 Hz or less, the piano wire that has a length of about 50 mm or less and a diameter of about 2.9 mm or more, Since the natural frequency is 2000 Hz or more, it is easy to determine whether the detection signal is a vibration signal of the rod-shaped body itself.

  According to the sixth aspect of the present invention, since the fixing part of the rod-shaped body can be changed, the adjustment of the rod-shaped body length, that is, the natural frequency is determined from the natural frequency band of each measurement target portion of the object to be measured. The work of shifting to a higher one is also easy.

  Hereinafter, an embodiment in which the vibration characteristic inspection apparatus according to the present invention is applied to the inspection of the natural vibration frequency of a photographic processing apparatus as an object to be measured will be described with reference to FIGS.

  FIG. 1 is a configuration diagram of a vibration characteristic inspection apparatus according to an embodiment of the present invention. The vibration characteristic inspection apparatus 1 includes a signal generator 2 that generates a periodic signal of, for example, a sine wave having a predetermined frequency, an amplifier 3 that amplifies the periodic signal output from the signal generator 2 to generate an excitation signal, and an amplification An excitation device 4 having a built-in excitation source for converting a subsequent excitation signal into magnetic force and converting it into mechanical vibration, and a rod portion 41 serving as a vibration transmission unit connected to the excitation source, and photographic processing The load cell 5 that detects an excitation signal at a portion where vibration is transmitted from the rod portion 41 of the apparatus 10, and a predetermined portion of the photographic processing apparatus 10 (attention to be set as one or a plurality of measurement objects constituting the photographic processing apparatus 10 And a vibration analysis device 7 (vibration analysis means) that receives a detection signal from the vibration sensor 6 and performs frequency analysis thereof.

  The signal generator 2 is a signal generation source capable of selectively switching and outputting a periodic signal that is a sine wave signal of one or a plurality of channels (for frequencies). The frequency switching is performed manually or in advance in a predetermined order. What is set every predetermined time is adopted. The signal generator 2 is capable of generating a periodic signal in a frequency band that may be a natural frequency of the object to be measured, and has a natural frequency in a frequency band of 0 to 2000 Hz in a predetermined part of the photographic processing apparatus 10. Since it is presumed that they match, one that can generate a periodic signal in such a frequency band is used. The vibration device 4 has a built-in vibration source that receives an excitation signal from the amplifier 3 and generates mechanical vibration (reciprocating vibration) at the frequency using, for example, electromagnetic force. The rod portion 41 extends from the main body of the vibration device 4, that is, the base end is connected to the vibration source, and the tip is brought into contact with an appropriate position of the photographic processing device 10. It transmits to the processing apparatus 10 via a contact position. Details of the rod portion 41 will be described later. The load cell 5 is interposed between the tip of the rod portion 41 and the contact portion of the photographic processing apparatus 10 as necessary, and transmits vibrations to the photographic processing apparatus 10 and inputs input to the photographic processing apparatus 10. A vibration signal is detected and output to the vibration analyzer 7.

  The photographic processing apparatus 10 is an apparatus to which, for example, electrophotographic technology is applied, and prints input digital image data as an image on a photosensitive material. The photographic processing apparatus 10 is a cover frame composed of one or more sheets constituting a surface, film transport A film image optical reading unit, a monitor unit for checking the read image and confirming the input content from the input operation unit, a photosensitive material storage unit for printing, a photosensitive material transport unit, An exposure unit, a development processing (development, bleaching, fixing, and stable) unit, a drying unit, a discharge unit, and the like are provided as constituent members.

  The vibration sensor 6 is composed of, for example, a vibration detection sensor such as an acceleration sensor or a piezoelectric element, and is attached to the frame of the photographic processing apparatus 10 and one or more desired measurement target positions (each measurement target part). Each vibration sensor 6 has a signal line, and this signal line is connected to a vibration analyzer 7.

  The vibration analysis device 7 includes, for example, an FFT (Fast Fourier Transform) analyzer and the like, and can capture a detection signal from a signal line of the load cell 5 or the vibration sensor 6 via a connection portion. The vibration analysis device 7 takes in a signal inputted from the load cell 5 or the vibration sensor 6 by A / D (analog-digital) conversion at a predetermined sampling period, executes a Fourier transform process, and expresses it by frequency-level. And analyzing the natural frequency of a predetermined part of the photographic processing apparatus 10. The inspection results are provided with a monitor 71. The horizontal axis is the frequency, the vertical axis is the detection level, and the detection signals are individually or divided into a predetermined number of small screens within the same coordinate axis. You may make it display. For each detection signal, all signals can be captured by a method such as sampling in a time division manner. It is good also as an aspect which connects a printer and outputs an analysis result to this. By outputting the analysis result from the vibration analysis device 7 (including output to the monitor 71 and the printer), it is possible to recognize the natural frequency at each part. Therefore, the designer or quality control worker before shipment may change the design at a design stage or adopt a vibration control structure for a part having a particularly high resonance level, or at the time of shipment. For example, improvement measures such as attaching vibration damping members and checking for mounting defects can be made.

  FIG. 2 is a structural diagram of the rod portion shown in FIG. The rod portion 41 protrudes from the main body of the vibration device 4 by bolting or the like, and is, for example, a fixing tool 411 having a rod shape made of stainless steel, and is attached to the fixing tool 411 by tightening. And a wire rod having a thickness and a diameter (preferably a piano wire 410 (SWP-B; defined in JIS G 3522 and JIS G 3502)), and a fixture 412 for fixing the tip of the wire 410 by tightening. Do it. The fixture 411 and the fixture 412 have a pair structure, and a load cell 5 provided as needed is attached to the other end of the fixture 412. Then, the photographic processing apparatus 10 is arranged at a predetermined distance from the vibration apparatus so that the wire 410 is stretched (with both ends fixed to the fixtures 411 and 412). The photographic processing apparatus 10 as the object to be measured is supported by hanging or lifting at a required number of supporting points so that vibration can be detected efficiently (suppressing attenuation as much as possible). ing.

  FIG. 3 is a structural diagram of the length fixing tool shown in FIG. 2, (A) is a perspective view showing a state before fastening, and (B) is a perspective view showing a state after fastening. Since the fixtures 411 and 412 have the same structure, the fixture 411 will be described as a representative.

  The fixture 411 has a main body portion 411a having a hole into which the wire 410 is fitted and a small diameter formed at the distal end of the main body portion 411a, and a male screw having a hole into which the wire 410 is fitted is screwed. The male threaded portion 411b, and a plurality of narrowed projecting protrusions 411c formed on the distal end face of the male threaded portion 411b and divided in the circumferential direction from the outer periphery of the hole toward the distal end. In addition, it has a cylindrical body that externally fits the throttle protrusion 411c, and has a tightening portion 411d in which a female screw that engages with the male screw portion 411b is threaded on the inner surface by an appropriate size on the base end side. It is configured.

  The wire 410 is fitted in the order of the tightening portion 411d, the restricting protrusion 411c, the male screw portion 411b, and the main body portion 411a, and the male portion 411d is rotated by rotating the tightening portion 411d while adjusting the insertion dimension to the main body portion 411a. By screwing with the screw portion 411b, the cylindrical surface of the tightening portion 411d tightens the wire 410 via the restricting protrusion 411c and fixes it to the fixture 411. Since the thickness of the throttle protrusion 411c is continuously reduced from the base end toward the tip, and the inner surface of the cylinder is reduced in diameter, the throttle protrusion 411d of the tightening portion 411d is formed in accordance with the diameter of the wire 410. By changing the fastening position with respect to 411c, it is possible to suitably fasten and fix the wire 410 with a slightly different diameter. Of course, the cylindrical inner diameter of the throttle projection piece 411c and the tightening portion of the clamp projection 411d with respect to the throttle projection piece 411c can be suitably clamped and fixed to the wire 410 having significantly different diameters (for example, nearly different times). A plurality of types of fixtures 411 and 412 having different diameters may be prepared and used by exchanging depending on the diameter of the wire 410 to be used.

  In general, the natural frequency of the wire 410 increases as the length decreases and the diameter increases. That is, when the natural frequency of the wire 410 matches or approximates the natural frequency at a predetermined part of the photographic processing apparatus 10, the detection signal output to the vibration analyzing apparatus 7 is caused by resonance of the predetermined part of the photographic processing apparatus 10. Therefore, it is impossible to determine whether the resonance is due to the resonance of the rod portion 41, and an accurate inspection result for the natural frequency of the photographic processing apparatus 10 cannot be obtained. Therefore, the length dimension and the diameter of the wire 410 are set so that the natural frequency of the wire 410 is higher than the natural frequency of a predetermined part of the photographic processing apparatus 10.

  Hereinafter, the length and diameter of the wire 410 suitable for use in the vibration characteristic inspection apparatus 1 will be described. An experiment was conducted to measure the length and diameter of a wire suitable for use in the rod portion shown in FIG. The experimental results are shown in Table 1. The experiment is performed using the vibration characteristic inspection apparatus 1 shown in FIG. 1, and the vibration sensor 6 is attached not to the photographic processing apparatus 10 but to a predetermined portion of the wire 410, for example, an intermediate position in the length direction. The measurement was performed by measuring the natural frequency of the rod portion 41. In the experiment, 300 Hz, 500 Hz, 1000 Hz, 1500 Hz, and 2000 Hz sinusoidal vibrations are used as the excitation frequency, and a piano wire (SWP-B) is used as the wire 410, and the wire diameters are 100 mm, 80 mm, and 50 mm. A total of 15 types, 0 mm, 2.9 mm, 3.2 mm, 4.0 mm, and 0.5 mm, were used. In this experiment, as shown in Table 1, the following conclusions (1) to (4) were obtained.

  (1) The piano wire having a wire length of 100 mm and a wire diameter of 2.0 mm did not resonate with respect to excitation with frequencies of 300 Hz and 500 Hz. From this, the natural frequency of a piano wire having a wire length of 100 mm and a wire diameter of 2.0 mm is higher than 500 Hz. The natural frequency increases as the length of the piano wire becomes shorter and the diameter becomes thicker. Therefore, when measuring an object to be measured having a natural frequency near 300 to 500 Hz, the wire diameter is 2.0 or more. It can be seen that it is preferable to use the wire 410 having a wire length of 100 mm or less.

  (2) The piano wire having a wire diameter of 2.0 mm and a wire length of 100 mm resonated with vibration at a frequency of 1000 Hz, and the piano wire having a wire diameter of 2.0 mm and a wire length of 50 and 80 mm did not resonate. Therefore, the natural frequency of a piano wire having a wire diameter of 2.0 mm and a wire length of 100 mm is around 1000 Hz, and the natural frequency of a piano wire having a wire diameter of 2.0 mm and a wire length of 50 and 80 mm is not around 1000 Hz. . Therefore, it can be seen that when measuring an object to be measured having a natural frequency around 1000 Hz, it is preferable to use a piano wire having a wire diameter of 2.0 or more and a wire length of 80 mm or less as the wire 410.

  In addition, the piano wire having a wire length of 100 mm and a wire diameter of 2.9 mm did not resonate with respect to excitation with a frequency of 1000 Hz. From this, the natural frequency of the piano wire having a wire length of 100 mm and a wire diameter of 2.9 mm is not around 1000 Hz. Therefore, it is understood that when measuring an object having a natural frequency near 1000 Hz, it is preferable to use a piano wire having a wire length of 100 mm or less and a wire diameter of 2.9 mm or more as the wire 410.

  (3) A piano wire with a wire length of 100 mm and a wire diameter of 3.2 mm resonated with vibration at a frequency of 1500 Hz, and a piano wire with a wire length of 100 mm and a wire diameter of 4.0 mm did not resonate. From this, the natural frequency of a piano wire having a wire length of 100 mm and a wire diameter of 3.2 mm is around 1500 Hz, and the natural frequency of a piano wire having a wire length of 100 mm and a wire diameter of 4.0 mm is not around 1500 Hz. Therefore, it can be seen that when measuring an object having a natural frequency near 1500 Hz, it is preferable to use a piano wire having a wire length of 100 mm or less and a wire diameter of 4.0 mm or more as the wire 410.

  Also, the piano wire with a wire length of 80 mm and a wire diameter of 2.9 mm resonates with vibration at a frequency of 1500 Hz, but the piano wire with a wire length of 80 mm and a wire diameter of 3.2 mm did not resonate. Therefore, the natural frequency of a piano wire having a wire length of 80 mm and a wire diameter of 2.9 mm is around 1500 Hz, and the natural frequency of a piano wire having a wire diameter of 3.2 mm and a wire length of 80 mm is not around 1500 Hz. Therefore, it can be seen that when measuring an object to be measured having a natural frequency around 1500 Hz, it is preferable to use a piano wire having a wire diameter of 3.2 mm or more and a wire length of 80 mm or less as the wire 410.

  Further, the piano wire having a wire length of 50 mm and a wire diameter of 2.0 mm did not resonate with respect to the vibration with a frequency of 1500 Hz. From this, the natural frequency of the piano wire having a wire length of 50 mm and a wire diameter of 2.0 mm is not around 1500 Hz. Therefore, it can be seen that when measuring an object to be measured having a natural frequency around 1500 Hz, it is preferable to use a piano wire having a wire length of 50 mm or less and a wire diameter of 2.0 mm or more as the wire 410.

  (4) The piano wire with a wire length of 100 mm and a wire diameter of 4.0 mm resonated with vibration at a frequency of 2000 Hz, and the piano wire with a wire length of 100 mm and a wire diameter of 4.5 mm did not resonate. Therefore, the natural frequency of a piano wire having a wire length of 100 mm and a wire diameter of 4.0 mm is around 2000 Hz, and the natural frequency of a piano wire having a wire length of 100 mm and a wire diameter of 4.5 mm is not around 2000 Hz. Therefore, when measuring an object having a natural frequency near 2000 Hz, it is understood that it is preferable to use a piano wire having a wire length of 100 mm or less and a wire diameter of 4.5 mm or more as the wire 410.

  In addition, the piano wire with a wire diameter of 3.2 mm and a wire length of 80 mm resonated with vibration at a frequency near 2000 Hz, and the piano wire with a wire diameter of 4.0 mm and a wire length of 80 mm did not resonate. From this, the natural frequency of a piano wire having a wire diameter of 3.2 mm and a wire length of 80 mm is around 2000 Hz, and the natural frequency of a piano wire having a wire diameter of 4.0 mm and a wire length of 80 mm is around 2000 Hz. Therefore, it can be seen that when measuring an object having a natural frequency around 2000 Hz, it is preferable to use a piano wire having a wire diameter of 4.0 mm or more and a wire length of 80 mm or less as the wire 410.

  Also, the piano wire with a wire length of 50 mm and a wire diameter of 2.0 mm resonates with vibration at a frequency of 2000 Hz, but the piano wire with a wire length of 50 mm and a wire diameter of 2.9 mm did not resonate. From this, the natural frequency of a piano wire having a wire length of 50 mm and a wire diameter of 2.0 mm is around 2000 Hz, and the natural frequency of a piano wire having a wire length of 50 mm and a wire diameter of 2.9 mm is around 2000 Hz. Therefore, it can be seen that when measuring an object having a natural frequency of around 2000 Hz, it is preferable to use a piano wire having a wire length of 50 mm or less and a wire diameter of 2.9 mm or more as the wire 410.

  From the above experimental results, the vibration characteristic inspection apparatus 1 inspects the natural frequency of the photographic processing apparatus 10, and since the natural frequency of a predetermined part of the photographic processing apparatus 10 is generally 2000 Hz or less, as the wire 410, Piano wire with a wire diameter of 4.5 mm or more and wire length of 100 mm or less, or a piano wire with a wire diameter of 4.0 mm or more and wire length of 80 mm or less, or a piano with a wire diameter of 2.9 mm or more and a wire length of 50 mm or less It is shown that the use of the wire can be effectively prevented from affecting the inspection result of the natural frequency of the photographic processing apparatus 10 and is preferable. Therefore, in the vibration characteristic inspection apparatus 1, a wire set with such a wire length and wire diameter is used as the wire 410. The wire length and the wire diameter of the wire 410 are not limited to this, and the rod portion 41 has the natural frequency of the object to be measured according to the frequency band estimated to include the natural frequency of the object to be measured. What is necessary is just to set so that it may become a natural frequency more than the frequency band estimated to be included.

  The operation of the above-described vibration characteristic inspection apparatus 1 will be described. First, one of a plurality of channels is selected, a signal generator 2 generates a periodic signal having a predetermined frequency, and an amplifier 3 generates power by amplifying the periodic signal output from the signal generator 2 to generate an excitation signal. And output to the vibration device 4. In the vibration source of the vibration device 4, mechanical vibration is generated at a predetermined frequency based on the frequency of the excitation signal, transmitted to the load cell 5 through the rod portion 41, and attached to the load cell 5. Vibration is transmitted to 10. Here, in the load cell 5, the vibration transmitted to the photo processing device 10 is detected as a vibration signal, and is output to the vibration analysis device 7 through a signal line. Further, the vibration sensor 6 detects the vibration of the photographic processing apparatus 10 at a predetermined site as a detection signal, and the detection signal is output to the vibration analysis apparatus 7 through a signal line.

  In the vibration analyzer 7, signals input from the load cell 5 and the vibration sensor 6 are taken in by A / D conversion at a predetermined sampling period, and Fourier transform processing is executed and analyzed as data represented by frequency levels. The analysis result is displayed on the monitor 71 and displayed. Next, the channel of the signal generator 2 is switched, a periodic signal having a different frequency is generated by the signal generator 2, and a mechanical vibration having a different frequency is generated by the vibration source of the vibration device 4. In this way, the signal generator 2 is sequentially switched to a desired channel, and a plurality of types of mechanical vibrations are generated in the frequency band of 0 to 2000 Hz by the vibration source of the vibration device 4 and transmitted to the photographic processing device 10. By doing so, vibrations of the photographic processing apparatus 10 corresponding to a plurality of types of vibrations are detected, so that the natural frequency of the photographic processing apparatus 10 is accurately measured.

  In the vibration characteristic inspection apparatus 1 according to the embodiment of the present invention described above, the natural frequency of the wire 410 is based on a frequency band (2000 Hz) that is estimated to include the natural frequency of a predetermined part of the photographic processing apparatus 10. Therefore, when the photographic processing apparatus 10 resonates due to vibration, the wire 410 does not resonate, and the influence of resonance of the wire 410 can be effectively prevented. The inspection result of the natural frequency of the photographic processing apparatus 10 can be accurately measured.

  In the present invention, the vibration sensor 6 is not limited to a plurality of use, and the vibration of the photo processing apparatus 10 may be detected only at one place using only one. The configuration of the rod portion 41 is not limited to the above. For example, the configuration of the fixtures 411 and 412 may be a configuration in which the length of the wire 410 cannot be adjusted, but at least one of the fixtures 411 and 412 may be used. It is preferable that the member can adjust the length of the wire 410 because the fixed frequency of the wire 410 can be finely adjusted. In the present invention, a piano wire is used as the wire 410. However, the vibration transmission medium (vibration generated by the vibration device 4) that can set the natural frequency of the rod portion 41 higher than the object to be measured is used. Any medium may be used as long as the medium is transmitted to the object to be measured, and another member (that is, a rod-like body) may be used. Further, the object to be measured is not limited to the photographic processing apparatus, but may be an individual part in the photographic processing apparatus or another apparatus that is not preferable to resonate due to vibration caused by normal use such as a refrigerator or a television. .

It is a block diagram of the vibration characteristic inspection apparatus concerning one embodiment of this invention. It is a structural diagram of a rod part. FIG. 3 is a structural diagram of the length fixing device shown in FIG. 2, (A) is a perspective view showing a state before tightening, and (B) is a perspective view showing a state after tightening.

Explanation of symbols

1 Vibration characteristic inspection device 4 Excitation device (excitation means)
410 Wire rod (rod-like body)
411, 412 Fixing tool 6 Vibration sensor 7 Vibration analysis device (vibration analysis means)
10 Photo processing equipment (measurement object)

Claims (6)

  The object to be measured is vibrated by a vibration means, and each detection signal from a vibration sensor attached to one or a plurality of measurement target parts constituting the object to be measured is analyzed by a vibration analysis means. A vibration characteristic inspection apparatus for inspecting vibration characteristics, wherein the excitation means includes a rod-shaped body that mechanically transmits vibration of a vibration source to an appropriate position of the object to be measured, and the rod-shaped body has a natural frequency. Is higher than the natural frequency of each measurement target portion of the object to be measured.   The vibration characteristic inspection apparatus according to claim 1, wherein the rod-shaped body is made of a piano wire.   The rod-shaped body has a length of about 100 mm or less and a diameter of about 4.5 mm or more when all the natural frequencies of the measurement target portion are 2000 Hz or less. The vibration characteristic inspection apparatus according to 1 or 2.   The rod-shaped body has a length of about 80 mm or less and a diameter of about 4.0 mm or more when all of the natural frequencies of the measurement target portion are 2000 Hz or less. The vibration characteristic inspection apparatus according to 1 or 2.   The rod-shaped body has a length of about 50 mm or less and a diameter of about 2.9 mm or more when all the natural frequencies of the measurement target part are 2000 Hz or less. The vibration characteristic inspection apparatus according to 1 or 2.   The pair of fixing tools that fix and support the rod-shaped body at both ends, and at least one of the fixing tools is capable of changing a fixing portion of the rod-shaped body. The vibration characteristic inspection apparatus described.

Images