JP4210789B2 - Bobbin inspection apparatus and inspection method using the same - Google Patents

Description

  The present invention relates to a bobbin inspection apparatus that inspects the shape of a bobbin that winds up a film or the like, and an inspection method using the same.

  An ink ribbon used in a printer or the like is formed by winding a printing film around a cylindrical bobbin. At this time, if the bobbin is bent or the bobbin surface is uneven, the surface of the wound film may be wavy or the film tension may vary depending on the axial position of the bobbin. As described above, when the bobbin is not formed correctly, the appearance of the ink ribbon is deteriorated, and there is a problem that the use in a printer or the like is hindered.

As an apparatus conventionally used for detecting such a defective bobbin, for example, there is a scanning measuring apparatus described in Patent Document 1. In this apparatus, the scanning probe and the object to be measured are relatively moved while pressing the surface of the bobbin with a predetermined measurement pressure by the scanning probe. Then, the contour shape of the surface of the bobbin is measured from the locus of the relative movement, and the defective bobbin is detected by comparing with the reference shape.
JP 2000-39302 A

  However, in the above-described scanning measuring apparatus, since the surface shape is measured while pressing the bobbin with the scanning probe, there is a possibility that the bobbin being measured is tilted by the pressing force of the probe. There are also the following problems. In such an apparatus, since the outer peripheral surface of the bobbin is copied, it is necessary to support the inner wall surface of the bobbin by pressing or the like so as not to disturb the copying. However, it is difficult to firmly fix the bobbin by such pressing of the inner wall surface. In this fixed state, the bobbin may be tilted by a relatively weak pressing force by the scanning probe. Therefore, it has been difficult for the conventional apparatus to accurately measure the surface shape of the bobbin.

  The present invention has been made to solve the above problems, and provides a bobbin detection device capable of accurately measuring the surface shape of a bobbin and reliably detecting a defective bobbin, and a detection method using the same. The purpose is to do.

  The bobbin inspection apparatus according to the present invention can support one end of a cylindrical bobbin, and is disposed at a position where the bobbin supported by the support member from the radial direction and a support member that rotates the bobbin around an axis. And a measuring unit having a laser projecting unit and a laser receiving unit, and a reference disposed between the laser projecting unit and the laser receiving unit at a position shifted from the support member with respect to the traveling direction of the laser beam. The support member is configured to be relatively movable in the axial direction of the bobbin with respect to the measurement unit, and is projected onto the laser light receiving unit by the laser beam irradiated to the bobbin and the reference member. The position of the bobbin and the reference member can be detected. The reference member has linearity and smoothness at the side of the workpiece to be measured in order to eliminate the influence of the shaking of the rail guide when the support member and the measurement unit are relatively moved in the axial direction. It is provided as a guarantee standard.

  According to this configuration, when the shape of the bobbin is measured by irradiating the laser beam, it is derived using the reference member. This has the following advantages. In other words, the laser beam may be swayed due to disturbance or the like while traveling from the laser projector to the laser receiver. Therefore, for example, the diameter of the projected bobbin may include this fluctuation, and does not necessarily represent an accurate measurement value. On the other hand, when the shape of the bobbin is obtained based on the distance from the fixed reference member, it means that the fluctuation of the laser beam is absorbed. Therefore, it is possible to measure the exact diameter of the bobbin.

  The bobbin inspection device preferably further includes a positioning member that is disposed in the vicinity of the bobbin supported by the support member and has an index extending in the vertical direction. By using such an index extending in the vertical direction as a reference, the bobbin can be installed vertically by eye measurement.

  Moreover, it is preferable to further comprise a housing that accommodates the support member, the measurement unit, and the reference member (positioning member), and the housing is configured to be movable. With this configuration, the inspection apparatus can be easily moved, and the mobility of the inspection apparatus can be improved. Here, you may accommodate the compressor which drives a supporting member in a housing | casing. In this case, it is preferable that the compressor is configured to be able to drive the support member in a state where the compressor is disposed outside the housing. This is because if the compressor is kept in the housing, the vibration may affect the measurement. Therefore, if the support member can be driven in a state of being arranged outside the housing as described above, it is possible to prevent the vibration of the compressor from affecting the measurement.

  The bobbin inspection method according to the present invention uses the bobbin inspection apparatus, and includes a first step of installing one end of the bobbin on the support member, and irradiating laser light from the laser projector. And a second step of detecting position information including the positions of one end and the other end in the radial direction of the bobbin projected onto the laser light receiving unit and the position of the one end of the projected reference member. ing.

  According to this method, since the reference member is used, an accurate surface shape can be measured without being affected by the shaking of the laser. Furthermore, the following three methods can be cited as a method for determining a bobbin defect. In the first method, in the second step, the support member is rotated by a predetermined angle, and the support member is relatively moved with respect to the measurement unit at one rotation position, and the bobbin is axially moved at predetermined intervals. The position information is calculated, the distance from one end of the reference member detected in the second step to one end and the other end in the radial direction of the bobbin is calculated, and the diameter of the bobbin is calculated from the difference therebetween. The method includes a third step of calculating, and a fourth step of comparing the calculated diameter of the bobbin with the diameter of the reference circle and determining a defective bobbin if the difference is equal to or greater than a predetermined value. By this method, it can be derived how much the cross-sectional shape of the bobbin is different from a perfect circle.

  In the second method, in the second step, the support member is rotated by a predetermined angle, and the support member is moved relative to the measurement unit at one rotational position, so that the support member is moved at predetermined intervals in the axial direction of the bobbin. The position information is detected, and the center of the cross-sectional shape of the bobbin at the measurement start position and the measurement end position is calculated from the position information at the measurement start position and the measurement end position in the axial direction of the bobbin, respectively. A fifth step of defining a line; a sixth step of calculating the position of the center point of the bobbin diameter from the position information; and calculating a distance between the center point and the virtual line, the distance being a predetermined value If it is above, it is a method provided with the 7th step which determines with it being a bad bobbin. By this method, the shake of the bobbin shaft can be derived.

  In the third method, in the second step, the support member is rotated by a predetermined angle, and the support member is moved relative to the measurement unit at one rotation position, and the bobbin is axially moved at predetermined intervals. The center of the cross-sectional shape of the bobbin at the measurement start position and the measurement end position from the position information at the measurement start position and measurement end position in the axial direction of the bobbin, respectively, An eighth step of defining a line; and a distance from the one end in the radial direction of the bobbin in the position information to the virtual line, and a ninth bobbin that is determined to be a defective bobbin if the distance is equal to or greater than a predetermined value. A method comprising the steps of: By this method, the uneven state on the surface of the bobbin can be derived.

  According to the present invention, the surface shape of the bobbin can be accurately measured, and a defective bobbin can be reliably detected.

  Hereinafter, an embodiment of a bobbin inspection apparatus according to the present invention will be described with reference to the drawings. 1 is a front view of the bobbin inspection apparatus, FIG. 2 is a front view of the inspection unit shown in FIG. 1, and FIG. 3 is a plan view of FIG.

  As shown in FIG. 1, the inspection apparatus 1 includes a casing 3 that is provided with a plurality of casters 2 on the bottom surface and is configured to be movable. A window 31 is provided on a side surface of the casing 3, and an inspection unit 4 for inspecting a bobbin is provided inside the casing 3 facing the window 31. In the inspection unit 4, the shape of the bobbin is measured in a non-contact manner using a laser beam, and the measured value is output to a computer 5 such as a personal computer provided outside the housing 3. The calculator 5 performs an operation based on this measurement value, and determines whether or not the target bobbin is defective. In addition, a compressor 6 for driving a device of the inspection unit 4 to be described later is housed in the housing 3. The compressor 6 is normally housed in the housing 3 and can be moved together with the housing 3. However, the compressor 6 can be driven in a state of being taken out of the housing 3. The computer 5 may also be arranged inside the housing 3.

  Next, the inspection unit will be described with reference to FIGS. The inspection unit 4 includes a support member 41 that supports a bobbin to be inspected, and a measurement unit 42 that irradiates the supported bobbin with laser light and measures the shape of the bobbin. On the upper surface of the support member 41, three mounting pins 411 for fixing the bobbin are erected, and these mounting pins 411 are movable in the radial direction. The support member 41 is configured to be movable in the vertical direction and is rotatable about the bobbin axis. The movement of the mounting pin 411 and the support member 41 as described above is performed using the compressor 6 as a driving source.

  The measuring unit 42 includes a laser light projecting unit 421 and a laser light receiving unit 422 that are disposed at positions that sandwich the support member 41 in the horizontal direction. The laser light emitted from the laser projection unit 421 is received by the laser light receiving unit 422 after irradiating the bobbin. A reference pin (reference member) 43 serving as a reference when measuring the position of the bobbin is fixed in the vicinity of the laser light receiving unit 421. The reference pin 43 extends in the vertical direction, and is arranged at a position shifted in the horizontal direction from the support member 41 with respect to the irradiation direction L of the laser beam. As shown in FIG. 3, in the measurement unit 42, the bobbin and the reference pin 43 are projected onto the laser light receiving unit 42 by the laser light emitted from the laser projecting unit 421, and four pieces of position information, that is, one end of the reference pin 43 is projected. The positions of the part E1 and the other end part E2 and the positions of the one end part E3 and the other end part E4 of the bobbin are measured. These measured values are output to the computer 5 as position information, and various calculations are performed to determine bobbin defects.

  The inspection unit 4 is provided with a positioning plate 44 for installing the bobbin vertically. The positioning plate 44 is provided on the back side of the support member 41, that is, on the opposite side of the support member 41 from the window 31 of the housing 3, and is positioned in the vertical direction on the surface facing the window 31 side. A line (index) 441 is displayed. Further, a positioning pin 45 extending in the vertical direction is provided between the support member 41 and the window 31, that is, on the front side of the support member 41. The positioning pin 45, the support member 41, and the positioning line 441 are arranged on a straight line in the horizontal direction, and the operator installs the bobbin vertically with reference to the positioning pin 45 and the positioning line 441. ing.

  Next, the procedure for measuring the surface shape of the bobbin will be described. First, the bobbin is installed on the upper surface of the support member 41 so that the mounting pin 411 on the support member 41 is inserted into one end of the bobbin. Subsequently, the mounting pin 411 is moved radially outward to press the inner wall surface of the bobbin. As a result, the bobbin 411 is fixed to the support member 41. At this time, the operator visually checks whether the bobbin is installed vertically with reference to the positioning wire 441 and the positioning pin 45. If the bobbin is displaced from the positioning wire 441 or the positioning pin 45, the operator again Perform installation work. Subsequently, the support member 41 is driven to start measurement of the surface shape. In the initial state, the support member 41 is disposed so that the measurement unit 42 is positioned near the lower end of the bobbin. Then, the support member 41 is lowered from this state. When the support member 41 is lowered in this way, position information obtained by being projected onto the laser light receiving unit 422 is measured at predetermined intervals in the axial direction and output to the computer 5. Thus, when the position information about the predetermined distance from the lower end to the upper end of the bobbin is measured, the support member 41 stops, and after it rotates around the axis of the bobbin by a predetermined angle, it starts to rise. Then, in the process of raising the support member 41, position information at this rotational position is measured. Then, while rotating the support member 41 by a predetermined angle, the ascending and descending are repeated, and the position information at each rotational position is measured at predetermined intervals in the axial direction.

  Next, the handling of measurement results, that is, a method for determining a defective bobbin will be described. In the following, as an example, data at a total of 260 locations was measured every 0.5 mm in the axial direction at a total of 72 rotational positions obtained by rotating the bobbin by 5 degrees. That is, data of 18720 points (= 72 × 260) was measured. In the present embodiment, three types of calculated values, that is, the cylindricity, the coaxiality, and the smoothness of the bobbin are derived from the position information measured as described above.

  First, cylindricity will be described. First, based on the measured position information, the distance X between the position E2 at one end of the reference pin 43 and the position E4 at one end of the bobbin, and the position E2 at one end of the reference pin 43 and the other end of the bobbin. A distance Y from the position E3 is calculated. And the diameter of a bobbin is derived | led-out by calculating these differences, ie, XY. Thus, after the bobbin diameter is derived for all the measurement points, the maximum value is derived from the diameters of the respective positions in the axial direction at each rotational position. A value obtained by arranging these maximum values at corresponding rotational positions is defined as a cylindricity and compared with a reference perfect circle. A graph of the cylindricity calculated in this way is shown in FIG. In the figure, line A represents cylindricity, and line B represents a perfect circle. The cylindricity indicates how much the cross-sectional shape of the bobbin differs from a perfect circle. In this example, the line A shows two protrusions (upper right and lower left in the figure), which are burrs generated when the bobbin is molded. Then, the cylindricity represented by the line A is compared with a reference perfect circle, and if the maximum value of the radial distance between the line A and the line B is 100 μm or more, it is determined as a defective bobbin. To do. At this time, in order to further improve the quality, it can be determined as a defective bobbin with a thickness of 20 μm or more.

  Subsequently, the coaxiality will be described. First, as shown in FIG. 5, the cross-sectional shape of the bobbin at the measurement start position and the measurement end position in the axial direction is calculated based on the measured position information. Subsequently, the center is derived from these cross-sectional shapes, and a straight line connecting the center of the measurement start position and the center of the measurement end position is defined as an imaginary line N. Next, the center C1 of the bobbin diameter, that is, C1 = (XY) / 2 is calculated for all measurement points. Then, at each position in the axial direction, the maximum center C1 is obtained from the centers C1 of the respective rotational positions, and the distance S1, that is, the coaxiality with the virtual line N is derived. FIG. 6 shows the distances S1 thus derived arranged at corresponding positions in the axial direction. The concentricity indicates the shake of the bobbin shaft. If the absolute value S1 is 100 μm or more, it is determined as a defective bobbin.

  Finally, the smoothness will be described. First, an imaginary line is defined in the same manner as the coaxiality. Subsequently, as shown in FIG. 7, distances D1 between the position E3 and the virtual line N are calculated for all measurement points. Then, at each position in the axial direction, the maximum value, that is, the smoothness is obtained from the distances D1 of the respective rotational positions. In FIG. 8, all the distances D1 are shown for each rotation position, but the one that is farthest from the virtual line N is the smoothness. The smoothness indicates the degree of unevenness on the surface of the bobbin, and if this value is 20 μm or more, it is determined as a defective bobbin.

  As described above, according to this embodiment, the diameter of the projected bobbin is derived using the reference pin 43 when measuring the shape of the bobbin by irradiating the laser beam. This has the following advantages. In other words, the laser light may be swayed due to disturbance or the like while traveling from the laser light projecting unit 421 to the laser light receiving unit 422. Therefore, the diameter of the projected bobbin, that is, the distance between E3 and E4 shown in FIG. 3, may include this fluctuation, and does not necessarily represent an accurate measurement value. On the other hand, in the present embodiment, the bobbin diameter is obtained by the distance from the fixed reference pin, that is, the difference between X and Y shown in FIG. It will be derived. Therefore, it is possible to measure the exact diameter of the bobbin.

  Further, by using this reference pin 43, the present embodiment introduces the concept of smoothness. As a result, irregularities on the surface of the bobbin that cannot be detected only by the cylindricity or the coaxiality can be detected, and the bobbin defects can be detected in a multifaceted manner.

  In the above measurement, the coaxiality and smoothness are obtained using the concept of virtual line N. This virtual line N is defined by connecting the center of the cross section at the measurement start position and the center of the cross section at the measurement end position. The use of the virtual line N has the following advantages. For example, when the bobbin is installed on the support member 41, if the bobbin is not installed correctly vertically, the calculation is performed with the coaxiality and the smoothness being deviated, and thus accurate measurement cannot be performed. On the other hand, the imaginary line N is obtained by connecting the center of the cross section at the measurement start position and the center of the cross section at the measurement end position. Therefore, the bobbin is assumed to be equivalent to a vertical axis. Can think. That is, since a virtual line equivalent to a vertical axis is used, the coaxiality and smoothness are the same as those derived when the bobbin is installed vertically. For this reason, even if the bobbin is not installed vertically correctly with respect to the support member 41, accurate coaxiality and smoothness can be derived as long as the bobbin is installed vertically at the eye level using the positioning plate 44 or the like. be able to. As a result, the time required for installing the bobbin can be shortened, and the measurement work can be performed efficiently.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to this, A various change is possible unless it deviates from the meaning. For example, in the above embodiment, the bobbin is measured by fixing the measuring unit 42 and moving the support member 41, but this can be reversed. That is, it suffices if both the support member 41 and the measurement unit 42 are configured to move relative to each other so as to move.

  Further, in the above embodiment, the pin is used as the reference member, but the reference member according to the present invention is not limited to this, and the position can be projected onto the laser light receiving unit, and the linearity (smoothness) is achieved. As long as it can be guaranteed, a piano wire or a rectangular member may be used.

  Further, the numerical values that are the criteria for determining the cylindricity, the coaxiality, and the smoothness are not limited to those described above, and can be appropriately changed according to the size of the bobbin and the quality criteria.

It is a front view of the bobbin inspection device concerning one embodiment of the present invention. It is a front view of the test | inspection part in the test | inspection apparatus shown in FIG. It is a top view of the test | inspection part in the test | inspection apparatus shown in FIG. It is an example of the measurement result of cylindricity. It is a figure explaining coaxiality. It is an example of the measurement result of coaxiality. It is a figure explaining smoothness. It is an example of the measurement result of smoothness.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bobbin inspection apparatus 3 Housing | casing 4 Inspection | inspection part 41 Support member 42 Measurement part 421 Laser light projection part 422 Laser light-receiving part 43 Reference | standard pin (reference | standard member)
6 Compressor

Claims (7)

A support member capable of supporting one end of a cylindrical bobbin and rotating the bobbin around an axis;
A measuring unit having a laser projecting unit and a laser receiving unit disposed at a position sandwiching the bobbin supported by the support member from the radial direction;
A reference member disposed at a position displaced from the support member with respect to the traveling direction of laser light between the laser light projecting unit and the laser light receiving unit,
A computer for determining a bobbin defect,
The support member is configured to be relatively movable in the axial direction of the bobbin with respect to the measurement unit,
The bobbin and the reference member are configured to be able to detect the positions of the bobbin and the reference member projected on the laser light receiving unit by the laser light irradiated on the bobbin and the reference member.
The measuring unit is
A position having a position of one end and the other end in the radial direction of the bobbin projected from the laser light projecting unit and projected onto the laser receiving unit, and a position of the projected one end of the reference member Detect information,
When the support member rotates by a predetermined angle, the support member is moved relative to the measurement unit for one rotational position to detect position information at predetermined intervals in the axial direction of the bobbin,
The calculator is
From the position information at the measurement start position and measurement end position in the axial direction of the bobbin, calculate the center of the cross-sectional shape of the bobbin at the measurement start position and the measurement end position, respectively, and define virtual lines connecting these centers,
Calculate the position of the center point of the diameter of the bobbin from the position information,
A bobbin inspection device that calculates a distance between the center point and the virtual line, and determines that the bobbin is defective if the distance is equal to or greater than a predetermined value . A support member capable of supporting one end of a cylindrical bobbin and rotating the bobbin around an axis;
A measuring unit having a laser projecting unit and a laser receiving unit disposed at a position sandwiching the bobbin supported by the support member from the radial direction;
A reference member disposed at a position displaced from the support member with respect to the traveling direction of laser light between the laser light projecting unit and the laser light receiving unit,
A computer for determining a bobbin defect,
The support member is configured to be relatively movable in the axial direction of the bobbin with respect to the measurement unit,
The bobbin and the reference member are configured to be able to detect the positions of the bobbin and the reference member projected on the laser light receiving unit by the laser light irradiated on the bobbin and the reference member.
The measuring unit is
A position having a position of one end and the other end in the radial direction of the bobbin projected from the laser light projecting unit and projected onto the laser receiving unit, and a position of the projected one end of the reference member Detect information,
When the support member rotates by a predetermined angle, the support member is moved relative to the measurement unit for one rotational position to detect position information at predetermined intervals in the axial direction of the bobbin,
The calculator is
Calculate the center of the cross-sectional shape of the bobbin at the measurement start position and the measurement end position from the position information at the measurement start position and measurement end position in the axial direction of the bobbin, respectively, and define a virtual line connecting these centers.
A bobbin inspection device that calculates a distance from one end portion in the radial direction of the bobbin in the position information to the virtual line and measures a defective bobbin if the distance is equal to or greater than a predetermined value. Wherein arranged in the vicinity of the bobbin supported by the supporting member, the bobbin inspection apparatus according to claim 1 or 2, further comprising a positioning member having an indicator extending in the vertical direction. The bobbin inspection device according to any one of claims 1 to 3, further comprising a housing that houses the support member, the measurement unit, and the reference member, and the housing is configured to be movable. The bobbin according to claim 4 , wherein the housing houses a compressor that drives the support member, and the compressor is configured to be able to drive the support member in a state of being disposed outside the housing. Inspection device. A support member capable of supporting one end of a cylindrical bobbin, rotating the bobbin around an axis, a laser projecting unit disposed at a position sandwiching the bobbin supported by the support member from the radial direction, and laser light reception And a reference member disposed at a position shifted from the support member with respect to the traveling direction of the laser light between the laser projecting unit and the laser light receiving unit, and the support member Is configured to be movable relative to the measuring unit in the axial direction of the bobbin, and detects the position of the bobbin and the reference member projected onto the laser light receiving unit by the laser beam irradiated to the bobbin and the reference member. A bobbin inspection method using a bobbin inspection device configured to be possible,
A first step of installing one end of a bobbin on the support member;
A position having a position of one end and the other end in the radial direction of the bobbin projected from the laser light projecting unit and projected onto the laser receiving unit, and a position of the projected one end of the reference member A second step of detecting information;
With
In the second step, the support member is rotated by a predetermined angle, the support member is relatively moved with respect to the measurement unit for one rotational position, and position information at predetermined intervals in the axial direction of the bobbin is detected.
The center of the cross-sectional shape of the bobbin at the measurement start position and the measurement end position is calculated from the position information at the measurement start position and the measurement end position in the axial direction of the bobbin, respectively, and a third line that defines a virtual line connecting these centers is defined. And the steps
A fourth step of calculating a position of a center point of the diameter of the bobbin from the position information;
The center point and calculates the distance between the virtual line, Rubo bottle inspection method the distance is further provided a fifth step of determining that a defective bobbin equal to or greater than a predetermined value. A support member capable of supporting one end of a cylindrical bobbin, rotating the bobbin around an axis, a laser projecting unit disposed at a position sandwiching the bobbin supported by the support member from the radial direction, and laser light reception And a reference member disposed at a position shifted from the support member with respect to the traveling direction of the laser light between the laser projecting unit and the laser light receiving unit, and the support member Is configured to be movable relative to the measuring unit in the axial direction of the bobbin, and detects the position of the bobbin and the reference member projected onto the laser light receiving unit by the laser beam irradiated to the bobbin and the reference member. A bobbin inspection method using a bobbin inspection device configured to be possible,
A first step of installing one end of a bobbin on the support member;
A position having a position of one end and the other end in the radial direction of the bobbin projected from the laser light projecting unit and projected onto the laser receiving unit, and a position of the projected one end of the reference member A second step of detecting information;
With
In the second step, the support member is rotated by a predetermined angle, the support member is relatively moved with respect to the measurement unit for one rotational position, and position information at predetermined intervals in the axial direction of the bobbin is detected.
A center of the cross-sectional shape of the bobbin at the measurement start position and the measurement end position is calculated from the position information at the measurement start position and the measurement end position in the axial direction of the bobbin, respectively, and a third line that defines an imaginary line connecting these centers is calculated. Steps,
Calculating a distance to the virtual line from one end portion in the radial direction of the bobbin in the position information, Rubo bottle the distance is further provided a fourth step of measuring is defective bobbins equal to or greater than a predetermined value Inspection method.

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