JP2015172521A - Container measurement device and measurement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container measurement device and measurement method that can easily and correctly perform automatic measurement of a level in a parting line, in which it is hard for conventional arts to automatically measure the level therein.SOLUTION: A container measurement device comprises: a turntable (40) on which a container is loaded in an upright state; an outer peripheral surface position measurement device (64) that measures a radius direction position of a container's outer peripheral surface in a plurality of circumferential direction positions in the vicinity of a parting line (PL) of the container (5) to be rotated by being loaded on the turntable (40); and a control device (50). The control device (50) is configured to: determine whether a level exists from an amount of change in result measured by the outer peripheral surface position measurement device (64) at each of the plurality of circumferential direction positions: determine a circumferential direction position of a level (5b); and determine a level dimension (δ) of the determined level from the radius direction position of the container's outer peripheral surface in the circumferential direction position of the determined level.

Description

  The present invention relates to a technique for automatically measuring various dimensions of a resin container filled with, for example, a beverage.

It is also performed in the prior art to automatically measure various dimensions in a resin container filled with a beverage or the like.
In the conventional automatic container measuring technology, for example, the “diameter” dimension (diameter dimension in the horizontal plane), height dimension (vertical dimension) of each part of the container, and the designated part of the container (a place already determined by each container) The “wall thickness” dimension is automatically measured.

Here, there are a plurality of types of molds (for example, a mold at the container mouth, a mold at the bottom of the container, and two types of molds at half of the container body), which are the objects of automatic measurement. There is a type manufactured using a combination of four types of molds). When manufacturing such a type of container, if the halved molds of the bonded container body parts are uneven, the container manufactured by the mold has a step in the parting line that is the joint location. May occur.
If such a level difference (a level difference in the parting line: a so-called hagumi level difference) is large, there will be inconveniences such as “print skipping” in the printed part when printing directly on the container, and the container being easily broken. .
Furthermore, the presence of the “gugmi step” indicates that the mold is worn.
For this reason, it is necessary to measure the hug step, but it has been difficult to automatically measure the position and size of the hug step with the prior art.

As another conventional technique, for example, the inner peripheral surface of a bottomed ceramic tube or the like is irradiated with an annular slit light, the annular image is detected, and the inner peripheral surface to be inspected is deformed according to the degree of deviation of the annular pattern. A technique for detecting the amount has been proposed (see Patent Document 1).
However, this technique (Patent Document 1) is a technique applied as a battery manufacturing method, for example, and is different in the technical field from a method for measuring a resin container filled with a beverage or the like. Further, Patent Document 1 does not describe any measurement of a hug step.

JP 2000-258141 A

  The present invention has been proposed in view of the above-described problems of the prior art, and can easily and accurately automatically measure the position and size of a hug step, which was difficult to measure automatically with the prior art. The object is to provide a container measuring device and a measuring method.

The container measuring device of the present invention is
A turntable (second turntable 40) on which the container is placed in an upright state;
An outer peripheral surface position measuring device (64) for measuring the radial position of the outer peripheral surface of the container at a plurality of circumferential positions in the vicinity of the parting line (PL) of the container (5) mounted on the turntable (40) and rotating. When,
A control device (control unit 50),
The control device (50)
It is determined whether or not there is a step from the amount of change in the measurement result of the outer peripheral surface position measuring device (64) at each of the plurality of circumferential positions, and the step (step of the parting line PL: the step of the hagumi step 5d) is determined. A function to determine the circumferential position,
It has a function of determining the step size (δ) of the step from the radial position of the outer peripheral surface of the container at the circumferential position of the determined step.

In the container measuring device of the present invention, the controller (50) determines a predetermined rotational angle (angular pitch) of the turntable (second turntable 40) when determining the circumferential position of the step (5d). The difference between the position coordinate (the display value of the linear gauge 64) near the parting line (PL) of the outer peripheral surface of the container measured every time and the position coordinate measured immediately before are calculated, Function to calculate the difference (difference difference)
Comparing the absolute value of the difference with a threshold value (threshold value), and determining a region where the difference is equal to or greater than the threshold value as the “circumferential position of the step (5d)”,
A function of selecting a maximum value and a minimum value of the position coordinates (display value of the linear gauge 64) in a region where the difference is equal to or greater than a threshold when determining the step size (δ);
It is preferable to have a function of determining a difference between the maximum value and the minimum value as a step size.
Here, the predetermined rotation angle (angular pitch) of the turntable (second turntable 40) may be appropriately set according to the size of the container to be measured, and the value is particularly limited. However, 0.5 to 3 °, particularly 0.5 ° is preferable from the viewpoint of reducing the variation in the measured value of the hug level difference, and the threshold (threshold) is the size of the container to be measured. The optimum value may be appropriately set according to the value, and the value is not particularly limited, and examples thereof include 0.003 mm or more and 0.004 mm or less.

And the container measuring method of the present invention comprises:
The radial position of the outer circumferential surface of the container at a plurality of circumferential positions in the vicinity of the parting line (PL) of the container (5) placed and rotated in an upright state on the turntable (second turntable 40), A measuring step of measuring by the outer peripheral surface position measuring device (64);
Level difference from the amount of change in the radial position of the outer circumferential surface of the container at a plurality of circumferential positions in the vicinity of the parting line (PL) of the container (5) placed on the turntable (40) measured in the measurement step. A step determining step for determining whether or not there exists,
A step position determining step for determining a circumferential position of the step when it is determined in the step determining step that a step exists;
It is characterized by comprising a step size determining step for determining a step size of the step from the radial position of the outer peripheral surface of the container at the circumferential position of the step determined in the step position determining step.

In the container measuring method of the present invention, the step position determining step
Measuring the position coordinates (display value of the linear gauge 64) in the vicinity of the parting line (PL) on the outer peripheral surface of the container for each predetermined rotation angle (angular pitch) of the turntable (second turntable 40);
The difference between the measured position coordinate of the outer peripheral surface of the container in the vicinity of the parting line (PL) (the display value of the linear gauge 64) and the position coordinate measured immediately before is calculated, and the difference ( Calculating the difference),
Comparing the absolute value of the difference with a threshold value (threshold value) and determining a region where the difference is greater than or equal to the threshold value as a circumferential position of the step (5d);
The step size determination process
Selecting a maximum value and a minimum value of the position coordinates (display value of the linear gauge) in an area where the difference is equal to or greater than a threshold value;
It is preferable to include a step of determining a difference between the maximum value and the minimum value as a step size.
Even in this case, the predetermined rotation angle (angular pitch) of the turntable (second turntable) may be appropriately set according to the size of the container to be measured, Although it is not limited, 0.5 ° to 3 °, particularly 0.5 ° is preferable from the viewpoint of reducing variation in the measured value of the hug step, and the threshold (threshold) is the size of the container to be measured. The optimum value may be set appropriately according to the thickness, and the value is not particularly limited, and examples thereof include 0.003 mm or more and 0.004 mm or less.

In carrying out the container measuring device of the present invention, a turntable (first turntable 20) on which the container (5) is placed in an upright state,
A diameter measuring device 30 (for example, measuring a distance from a reference point at a plurality of height positions of a container (5) mounted on the turntable (20) and rotating using a belt-like laser beam (Lb). Laser measuring instrument),
A control device (control unit 50),
The control device (50)
Based on the distance from the reference point at each of the plurality of height direction positions of the container (5) placed on the turntable (20), at each height direction position (horizontal cross section at the height direction position). A function to determine the position of the center of gravity;
It is preferable to have a function of determining the misalignment amount (δ) of the container (5) from the position of the center of gravity at each height direction position.
The “center misalignment amount” means that the center of gravity at a certain height direction (for example, the center of gravity of the container mouth) and the center of gravity at another position in the height direction (for example, the center of gravity of the bottom of the container) are in the same coordinate system. It is a term that means the distance between the centroids and / or the direction in which they are shifted.

In that case, the control device (50)
A plurality of measurement points (a1 to a12) on the outer peripheral surface of each height direction position (horizontal cross section at the height direction position) of the container (5) and the rotation center of the turntable (first turntable 20) From the distance (measurement result = R−L ₂ ), the two adjacent measurement points in the horizontal plane where the plurality of measurement points (a1 to a12) are present and the rotation center of the turntable (first turntable 20) as a vertex. A function of calculating an area and a center of gravity in each of a plurality of triangles (Δ0-a1-a2 to Δ0-a12-a1),
A function of calculating the center of gravity of the cross section of the container in the horizontal plane where the plurality of measurement points (a1 to a12) are present from the area and the center of gravity of each of the plurality of triangles (Δ0-a1-a2 to Δ0-a12-a1);
It is preferable to have a function of determining the amount of misalignment from the center of gravity of the cross section of the container at a plurality of height direction positions.

Further, when carrying out the container measuring method of the present invention, the distance from the reference points at a plurality of height positions of the container (5) that is placed and rotated in an upright state on the turntable (first turntable 20). Is measured using a belt-shaped laser beam emitted from, for example, the diameter measuring device 30 (laser measuring device),
From the distance from the reference point in each of the plurality of height direction positions of the container (5) placed on the turntable (20) measured in the measurement step, each height direction position of the container (5). Centroid position determining step for determining the position of the centroid at
It is preferable to include a center misalignment determining step of determining the center misalignment amount of the container from the position of the center of gravity of each container (5) in the height direction position determined in the center of gravity position determining step.

In that case, the center-of-gravity position determination step includes
A plurality of measurement points (a1 to a12) on the outer peripheral surface of each height direction position (horizontal cross section at the height direction position) of the container (5) and the rotation center of the turntable (first turntable 20) From the distance (measurement result = R−L ₂ ), the two adjacent measurement points in the horizontal plane where the plurality of measurement points (a1 to a12) are present and the rotation center of the turntable (first turntable 20) as a vertex. Calculating an area and a center of gravity in each of a plurality of triangles (Δ0-a1-a2 to Δ0-a12-a1),
A step of calculating the center of gravity of the container cross section in the horizontal plane where the plurality of measurement points (a1 to a12) are present from the area and the center of gravity of each of the plurality of triangles (Δ0-a1-a2 to Δ0-a12-a1). And
The center misalignment determination step preferably includes a step of determining the center misalignment amount from the center of gravity of the cross section of the container at a plurality of height direction positions.

According to the present invention having the above-described configuration, it is determined whether or not there is a step (5d) from the amount of change in the measurement result of the outer peripheral surface position measurement device (64) at each of a plurality of circumferential positions. The circumferential position of the step (parting line PL step: hug step 5d) is determined, and the step (5d) of the step (5d) is determined from the radial position of the outer circumferential surface of the container at the circumferential position of the determined step (5d). Since it is configured to determine the step size (δ), it is possible to accurately and automatically measure the hug step (5d).
Then, the indentation level difference (5d) of the container (5) is accurately detected, and various inconveniences that occur when the indentation level difference (5d) is large, for example, when printing directly on the container (5), “print skip” Can be prevented, and the inconvenience that the container (5) is easily broken can be prevented.
Moreover, since the hug step (5d) can be accurately measured, according to the present invention, it is possible to determine the degree of wear of the mold.

Here, as a container to be subjected to automatic measurement, for example, a plurality of types of molds (for example, a mold at the container mouth, a mold at the bottom of the container, and two types of molds at half of the container body, a total of 4 The type manufactured using what combined the kind of metal mold) is mentioned. The size and shape of the container are not particularly limited, and examples include a container having a body diameter of 30 to 55 mm, a diameter of 20 to 55 mm, a height of 70 to 150 mm, and the shape shown in FIG. Can do. The diameter of the most swelled portion of the body is defined as the body diameter.
When such a type of container is manufactured, when the mold is worn, the central axis (core) of the portion manufactured by the worn mold is deviated (shifted). A state in which the center of the portion constituting the container is deviated (a state in which the central axis is deviated) is a so-called “center misalignment”.
Such a type of container is generally manufactured by the following process. First, a pellet-shaped resin is melted, a rod-shaped product (parison or preform) is sandwiched between molds, air is blown into the rod-shaped resin, the resin expands, contacts the mold wall surface, and is molded. Goods (containers) are manufactured.
In this method, since the inner surface of the container is in contact with the blown air and the mold determines the shape of the outer peripheral surface of the container, the deviation of the mold is reflected in the shape of the outer peripheral surface of the container. Therefore, it is necessary to measure the amount of misalignment from the shape of the outer peripheral surface of the container. If “core misalignment” occurs and the amount thereof increases, the thickness of a part of the container becomes thin, and as a result, there arises a disadvantage that the container is likely to be perforated. Also, when sealing (sealing) a container filled with a beverage or the like, a load is applied to the container from above and below, but if a load is applied to the container from above and below in the presence of misalignment, Since the load is not evenly applied to the part, the container is bent. And if a container bends, a favorable seal | sticker will become difficult and will be a factor of a malfunctioning seal.
In order to avoid such inconvenience, it is necessary to measure the amount of misalignment (center misalignment amount), and there is a demand for measuring the amount of misalignment in automatic measurement of various dimensions of a container. However, in the prior art, an effective technique for automatically measuring the “core misalignment amount” of the container has not been proposed.

In the present invention, based on the distance from the reference point at each of the plurality of height direction positions of the container (5) placed on the turntable (20), each height direction position (at the height direction position). If the position of the center of gravity in the horizontal cross-section) is determined and the center misalignment amount of the container (5) is determined from the position of the center of gravity in each height direction position, the center misalignment amount of the container (5) is accurately determined. Can be automatically measured. As a result, it is possible to prevent inconvenience that a part of the container (5) is thin and easily perforated.
In addition, since the thickness of a part of the container (5) is prevented from becoming thin, even if a load is applied from above and below during sealing, the load is applied evenly, so that the container (5) Does not bend, and the malfunction of the seal can be prevented.

It is a top view of the embodiment of the present invention. It is sectional drawing which shows the shape of the container measured by embodiment. It is a top view of the location (D section of FIG. 1) which measures the thickness of a container, and a step difference. It is sectional drawing which shows the wall thickness of a container trunk | bottom lower part, the wall thickness of a container trunk upper part, and the wall thickness of a container bottom part. It is explanatory drawing which shows the outline | summary of the measurement of the thickness of a container trunk | drum lower part and the thickness of a container trunk | drum upper part. It is explanatory drawing which shows the outline | summary of the measurement of the thickness of a container bottom part. It is a top view of a 2nd turntable. It is explanatory drawing which shows the level | step difference (brush step) in a parting line. It is a top view which shows the outline | summary of a hagumi level | step difference measurement. It is a front view which shows the outline | summary of a hagumi level | step difference measurement. It is a characteristic view which shows an example of the measurement result of the measurement angle-linear gauge display value in a hagumi level | step difference measurement. It is a figure which shows the numerical value of an example of the measurement result of FIG. 11 with a table | surface form. It is a functional block diagram which shows the part which determines the hug step of the container of the control unit in embodiment shown in figure. It is a flowchart which shows the procedure of a hagumi level | step difference measurement. It is explanatory drawing which shows the outline | summary of the measurement of the diameter dimension of a container, and the amount of core shift. It is explanatory drawing of the calculation method of the gravity center of a container. It is a functional block diagram which shows the part which determines the amount of misalignment of the container of the control unit in embodiment shown in figure. It is a flowchart which shows the procedure of the measurement of the amount of misalignment of a container. It is explanatory drawing which shows the outline | summary of the height dimension measurement of a container. It is a figure which shows the measurement result of a hug step by the inventor (threshold value: 0.003 mm). It is a figure which shows the hagumi level | step difference measurement result by an inventor (threshold value: 0.004 mm). It is a figure which shows the hagumi level | step difference measurement result by an inventor. It is a figure which shows the hagumi level | step difference measurement result by an inventor. It is sectional drawing which shows the shape of the container used for the measurement of a hagumi level | step difference.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
In FIG. 1, the container measuring apparatus of the present invention is indicated generally by the reference numeral 100.
The container measuring device 100 includes a container moving robot 10, a first turntable 20, a diameter measuring device 30 (laser measuring device), a second turntable 40, a container pallet 5P, and a container collection box 5B. , A main control unit 50 which is a control means, and a frame 90 on which equipment related to the measuring apparatus is mounted.

The container moving robot 10 is formed by combining a plurality of rails that are orthogonal to each other, and includes an X-axis direction rail 11, a Y-axis direction rail 12, and a carrier 13. The carrier 13 moves on the Y-axis direction rail 12 in the vertical direction (arrow Fv) in FIG. The Y-axis direction rail 12 moves on the X-axis direction rail 11 in the left-right direction (arrow Fh) in FIG.
Although not clearly shown, the carrier 13 has an attachment, and the attachment has a suction port, and the suction port is in a vertical direction (a direction perpendicular to the paper surface of FIG. 1) below (in FIG. 1). It opens in a direction perpendicular to the page and away from the viewer. The attachment (not shown) selects one container 5 from the container group aligned on the container pallet 5P, inserts the attachment into the container 5 and sucks it with a vacuum generator (ejector) (not shown). The container 5 is configured to be transported to a predetermined position (for example, a position on the first table 20 or a position on the second table 40) in a state where the container 5 is sucked to the tip of the attachment.

In FIG. 1, the first turntable 20 is positioned approximately at the center of the frame 90, and includes a laser beam projector (hereinafter referred to as “light projector”) 31 and a laser beam receiver (hereinafter referred to as “light receiver”). Say) It is provided at a position between 32. Here, the light projecting unit 31 and the light receiving unit 32 constitute a laser measuring device 30.
In the laser measuring instrument 30, a fixing pin 33 is provided at a substantially intermediate position between the light projecting unit 31 and the light receiving unit 32.

The first turntable 20 has a rotating shaft 20s (see FIG. 19) on the lower surface side of the table center, and the rotating shaft 20s is moved up and down or rotated by a turntable rotating shaft lifting device (not shown).
A turntable rotary shaft elevating device (not shown) includes, for example, a ball screw and a rotation mechanism. Note that a turntable rotating shaft lifting device (not shown) can be configured not to lift and lower the turntable and rotate the turntable at the same time.

In FIG. 1, the 1st turntable 20 and the laser measuring device 30 comprise the 1st measurement part (a code | symbol is abbreviate | omitted).
The container pallet 5P is located at a position higher than the light projecting unit 31 and the light receiving unit 32, and the light projecting unit 31 is a straight line (trajectory) obtained by moving a longitudinal line (vertical direction in FIG. 1) of the pallet 5P downward in the vertical direction. A plurality of containers 5 arranged by an operator are arranged on the container pallet 5P.
In the first measurement unit, the diameter, height, and misalignment amount of each part of the container 5 are measured.
On the other hand, in the second measuring unit (near the second turntable 40), the “thickness” dimension of the designated portion in the container 5 and the “step difference in the parting line (so-called gutta step)” are measured.
Examples of the “designated portion in the container 5” include a trunk portion, a mouth portion, a bottom portion, and the like.

A container collection box (collection box for collecting measured containers) 5B is provided in the lower left corner of FIG.
The main control unit 50, which is a control means, is provided at a position below the container collection box 5B and is disposed on a floor plate (not shown).
In FIG. 1, the main control unit 50 is mounted on the frame 90 of the container measuring device 100, but may be separated from the container measuring device 100.

In the illustrated embodiment, for example, the diameter, height, misalignment amount, thickness, and hug step of each part of the container having a shape as shown in FIG. 2 or 24 are measured.
However, even in a container having a shape different from that shown in FIG. 2 or FIG. 24, it is possible to automatically measure the diameter, the height, the misalignment amount, the wall thickness, and the hug step.

Next, in the illustrated embodiment, a mode in which the thickness of the container 5 and the hug step (step in the parting line) are measured will be described.
As described with reference to FIG. 1, the measurement of the wall thickness and the measurement of the step difference in the container 5 are performed in the second measurement unit (near the second turntable 40).

The second turntable 40 will be described with reference to FIG. 1 mainly based on FIG.
In FIG. 1, the second turntable 40 is disposed on the left side of the light receiving unit 32 of the laser measuring device 30 (a region indicated by reference sign D in FIG. 1).
3 shows in detail the area indicated by the symbol D in FIG. 1, and in FIG. 3, the arrow A indicates the center of the second turntable 40.
The position indicated by the arrow A (point A) is that the carrier 13 of the container moving robot 10 lifts the container 5 from the first turntable 20 (or from the container pallet 5P) to the area of the second turntable 40 first. It is a place to mount.

In the second turntable 40, the container 5 moves in the order of point A → point B (position indicated by arrow B) → point C (position indicated by arrow C).
In FIG. 3, point B is a position for measuring the thickness of the bottom of the container.
In FIG. 3, point C is a place where the thickness of the lower part of the container body, the thickness of the upper part of the container body, and the hug step are measured.
The container 5 moves from point A to point B and from point B to point C when the second turntable 40 moves.

In FIG. 3, the rotation shaft of the second turntable 40 and the rotation drive mechanism for rotating the second turntable 40 are not shown.
The second turntable 40, the rotary shaft and the rotational drive mechanism (not shown in FIG. 3) are arranged in the X-axis direction (left-right direction in FIG. 3) and the cylinder 41 in the X-axis direction and the rail (see FIG. 3). Move by not shown).
On the other hand, the movement of the second turntable 40, the rotary shaft (not shown in FIG. 3) and the rotary drive mechanism in the Y-axis direction (vertical direction in FIG. 3) is caused by the cylinder 42 in the Y-axis direction and the rail laid in the Y-axis direction. (Not shown).

The measurement of the thickness of the container 5 in the second turntable 40 will be described.
In the illustrated embodiment, the container 5 having the shape shown in FIG. 2 has a thickness Ta (thickness at the lower part of the container body), Tb (thickness at the upper part of the container body), Te (container at the three parts shown in FIG. 4). The bottom wall thickness) is measured.

As shown in FIG. 5, the linear gauge 62A and the block 62B are in contact with each other and the linear gauge 62A is pushed in by the block 62B. The wall thicknesses Ta and Tb are measured from the displacement.
5, the linear gauge 62A has a gauge body 621a, a rod 622a extending vertically downward from the center of the gauge body 621a, and a stylus 623a extending in the horizontal direction (right side in FIG. 10) from the tip of the rod 622a. doing.
The block 62B has a block body 621b, a rod 622b extending vertically downward from the center of the block body 621b, and a stylus 623b extending in the horizontal direction (left side in FIG. 10) from the tip of the rod 622b.
When measuring the thicknesses Ta and Tb, the linear gauge 62A is calibrated. The stylus 623a and the stylus 623b are brought into contact with each other in the absence of the container 5, and the amount of displacement of the linear gauge 62A pushed in by the block 62B is stored as “0 mm” as a reference value. At the time of measurement, the thicknesses Ta and Tb are calculated from the difference between the reference value and the amount of displacement in which the linear gauge 62A is pushed by the block 62B when the container 5 is present.

At the time of measurement, the rod 622a and the stylus 623a of the linear gauge 62A are inserted into the container 5, and the tip (right end in FIG. 5) of the stylus 623a contacts the inner wall of the container 5. On the other hand, the tip (left end in FIG. 5) of the stylus 623b of the block 62B is in contact with the outer wall of the container 5 and a position facing the stylus 622a.
The linear gauge 62 </ b> A and the block 62 </ b> B are configured such that the position where the stylus 623 b contacts the outer wall of the container 5 is the position facing the position where the tip of the stylus 623 a contacts the inner wall of the container 5. .
The positions of the gauge body 621a and the block body 621b are fixed, and the lengths of the rods 622a and 622b and the lengths of the stylus 623a and 623b are constant.

The measurement of the wall thickness Te at the bottom of the container 5 will be described with reference to FIG.
As shown in FIG. 6, the wall thickness Te is measured as the distance between the stylus 636a of the block 63A and the stylus 633b of the linear gauge 63B.
In FIG. 6, the block 63 </ b> A includes a block main body 631 a, a first rod 632 a extending vertically upward from the upper end of the block main body 631 a, and the upper end of the first rod 632 a toward the container 5 side (left side in FIG. 6). A second rod 633a extending in the horizontal direction, a third rod 634a extending vertically downward (a direction toward the inside of the container 5) from the tip of the second rod 633a, and a lower end of the third rod 634a And a fourth rod 635a extending in the direction of the block main body 631a (right side in FIG. 6) in parallel with the bottom of the container 5 and extending vertically downward from the tip of the fourth rod 635a toward the container bottom 5e. A stylus 636a is provided.
The linear gauge 63B includes a gauge body 631b, a rod 632b extending horizontally from the center of the gauge body 631b (to the left in FIG. 6), and a stylus 633b extending vertically upward from the tip of the rod 632b. ing.

The distance La from the center of the block main body 631a in the block 63A to the center of the stylus 636a in the block 63A is equal to the distance Lb from the center of the gauge main body 631b in the linear gauge 63B to the center of the stylus 633b in the linear gauge 63B. Has been.
Accordingly, when the thickness Te of the bottom of the container 5 is measured, the position where the stylus 633b in the linear gauge 63B comes into contact with the lower surface of the bottom 5e of the container 5 is the position where the stylus 636a in the block 63A is the upper surface of the bottom 5e of the container 5. The block 63 </ b> A and the linear gauge 63 </ b> B are configured so as to face the position in contact with the linear gauge 63 </ b> B.
The positions of the block main body 631a and the gauge main body 631b are fixed, and the positions and lengths of the rods 632a, 633a, 634a, 635a, the length of the rod 632b, and the lengths of the stylus 636a, 633b are also constant.
The wall thickness Te of the bottom 5e of the container 5 is measured from the amount of displacement in which the block 63A and the linear gauge 63B are in contact and the linear gauge 63B is pushed in by the block 63A.
The linear gauge 63B is also calibrated when measuring the wall thickness Te. In calibration, the stylus 636a and the stylus 636b are brought into contact with each other in the absence of the container 5, so that the displacement amount of the linear gauge 63B pushed in by the block 63A is stored as “0 mm” and used as a reference value. At the time of measurement, the wall thickness Te is calculated from the difference between the reference value and the amount of displacement in which the linear gauge 63B is pushed by the block 63A when the container 5 is present.

The probe of the linear gauge 63A (the generic name of the rod 634a, the rod 635a, and the stylus 636a) is not straight, and as shown in FIG. 6, the substantially L-shaped tip (tip of the rod 635a) is further bent at a right angle. The reason is as follows.
In the case of measuring the dimensions in the container 5, the thickness Te of the bottom 5e is determined so as to be measured in a region in the vicinity of the outer peripheral edge of the bottom 5e (a region at the radially outer end).
When the probe of the linear gauge 63A (the generic name of the rod 634a, the rod 635a, and the stylus 636a) is straight, the probe tip (the stylus 636a) cannot contact the central region in the radial direction of the container bottom 5e. However, it cannot contact the “place where the wall thickness is to be measured” in the vicinity of the outer peripheral edge of the container bottom 5e. That is, in the straight probe, the tip (stylus 636a) abuts only on the radially inner region.
On the other hand, as shown in FIG. 6, if the shape of the entire probe is made such that the L-shaped tip is further bent at a right angle, the probe tip (stylus 636a) is positioned in the vicinity of the outer peripheral edge of the container bottom 5e. It is possible to abut the “place where the wall thickness is to be measured”. Therefore, the probe of the linear gauge 63A is configured as shown in FIG.

The container 5 is held by the second turntable 40 during the measurement of the thickness Ta of the lower part of the container body shown in FIG. 5 and the thickness Tb of the upper part of the container body and the thickness Te of the bottom part of the container shown in FIG. Has been.
The second turntable 40 is provided with a suction mechanism, which sucks and holds the container 5 from the bottom side of the container 5 by the suction mechanism. Here, as the suction mechanism, a known and existing one can be applied.
In FIG. 7, a container suction area 40 a is provided in the central region in the radial direction of the second turntable 40. The second turntable 40 is formed with a plurality of (24 in FIG. 7) long holes 40b at equal intervals (in FIG. 7, every 15 ° of the central angle).

The reason why the plurality of long holes (through holes) 40b are formed in the second turntable 40 is as follows.
As described above, the bottom wall thickness Te of the container 5 is measured in the region E in the vicinity of the outer peripheral edge of the container bottom (region of the radially outer end: see FIG. 6).
When the bottom wall thickness Te of the container 5 is measured in the manner as shown in FIG. 6, when the container 5 is placed on the second turntable 40, the stylus 633 b of the linear gauge 63 </ b> B is in the second state. Since it interferes with the turntable 40 (since the second turntable 40 gets in the way), the wall thickness Te cannot be measured. Therefore, as shown in FIG. 7, a plurality of long hole-shaped cuts (through holes) 40b are formed in the second turntable so that the lower stylus 633b can be inserted from the long hole 40b. The bottom 5e of the container 5 is brought into contact with the bottom 5e, so that the thickness Te of the bottom 5b of the container 5 can be measured in the manner shown in FIG.
Here, if the shape of the through hole 40b is a long hole shape, since the radial dimension (major axis dimension) is long, the contact of the linear gauge 63B in both the radially inner area and the radially outer area. The needle 633b can be inserted into the long hole 40b. That is, if the shape of the through hole 40b is a long hole shape, the bottom of the container whose thickness Te is to be measured has a large (bottom) diameter and a small diameter in the form shown in FIG. The wall thickness Te can be measured.

Next, measurement of the step of the parting line in the illustrated embodiment (so-called hagumi step) will be described.
As shown in FIG. 8, when joining the halves of the barrel part of the container 5, if they are joined unevenly (if the joining is shifted), the container manufactured by the mold Causes a step 5d.
The step 5d in FIG. 8 is a step in the parting line, a so-called “brush step”.

In the measurement of the hug step 5d in the illustrated embodiment, the measurement can be performed in a state in which the state shown in FIGS. 5 and 6 (so-called “standing” state) is maintained without laying the container 5 in the horizontal direction. .
When measuring the hagumi level difference 5d in the illustrated embodiment, as shown in FIG. 9, while maintaining the state where the container 5 is placed on the second turntable 40, the second turntable 40 is rotated, Accordingly, the container 5 is rotated. A linear gauge 64 is disposed close to the container 5 (on the right side of the container 5 in FIG. 9), and the stylus of the linear gauge 64 is in contact with the outer peripheral surface of the container 5. When the container 5 is rotated, the radial position (lateral position in FIG. 9) of the outer peripheral surface of the container 5 is measured by the linear gauge 64.
The range in which the container 5 is rotated is centered around one toothbrush step 5d, and the center angle of the container 5 (or the rotation angle of the second turntable 40) is 10 ° before and after the toothbrush step 5d. It is a range (a range where the central angle of the container 5 is 20 ° in total). In the illustrated embodiment, the center angle of the container 5 (or the rotation angle of the second turntable 40) is measured by 0.5 °, for a total of 41 points.

The position of the parting line PL can be grasped as a joint location between halves of the container body, and in the case of a resin container, the joint location can be grasped as a linear trace on the surface of the container.
Since the position of the parting line PL can be grasped as the joining location, in FIG. 1, the container pallet 5P is arranged so that the joining location in the container 5 is directed in a certain direction by manual operation of the operator in FIG. Placed on top.
Since the container 5 is arranged on the container pallet 5P so that the joint portion in the container 5 is directed in a certain direction by the operator's manual work, the hagumi level difference 5d of the container 5 is constant when measuring the hagumi level difference 5d. It is placed on the second turntable 40 while facing the direction.
Here, since the operation of arranging the container 5 on the container pallet 5P is a manual operation by the operator, the position of the parting line PL of the container 5 arranged on the container pallet 5P, that is, the second turntable. There is a possibility that the position of the parting line PL of the container 5 placed on 40 varies slightly for each container 5. In order to deal with such a change in the position of the parting line PL, the outer periphery of the container 5 is arranged at a “center angle of 20 ° (± 10 °)” in increments of 0.5 ° at 41 points (41 locations). The radial position of the surface (the horizontal position in FIG. 9) is measured with a linear gauge 64.

With reference to FIGS. 9 to 11, measurement of a parting line level difference (so-called hagumi level difference) 5 d will be described.
In FIG. 9, the position of the toothbrush level difference 5d is, for example, a region where the central angle of the second turntable 40 is near 0 ° and a region near 180 °.

As shown in FIGS. 9 and 10, the container 5 is rotated by the second turntable 40 while the linear gauge 64 is in contact with the outer periphery of the container 5, and in the region near the parting line PL, the second turn The displacement (display value) of the linear gauge 64 at 41 positions is recorded at each rotation angle of the table 40 by 0.5 ° (the angular pitch measured by the linear gauge 64 is 0.5 °).
The displacement (display value) of the linear gauge 64 indicates the radial position (the horizontal position in FIGS. 9 and 10) of the outer peripheral surface of the container 5, and the second turntable 40 rotates by 20 °. The radial position of the outer peripheral surface of the container 5 at 41 locations is measured.
From the position in the radial direction of the outer peripheral surface of the container 5 at the 41 locations, the position of the toothpick step 5d (circumferential position) and the dimension δ of the toothpick step 5d are calculated.

In the region in the vicinity of the parting line PL (in the vicinity of the hagumi step 5d), the rotation angle of the second turntable was changed by 0.5 ° at 41 points while the second turntable 40 was rotated by 20 ° (measurement). The displacement of the linear gauge (for each angle) (display value: radial position of the outer peripheral surface of the container) is illustrated in FIG.
The measurement results described in FIG. 11 and FIG. 12 are the results of measuring the hug steps in the upper part of the trunk of the container shown in FIG. 24. The container to be measured has a trunk diameter of 49.1 mm, a caliber of 43 mm, The height is 90 mm.

Next, with reference to FIG. 12 as well, a mode of identifying the region (Hagumi step) denoted by δ and other regions in the illustrated embodiment will be described.
FIG. 12 displays the displacement of the linear gauge illustrated in FIG. 11 (display value: radial position of the outer peripheral surface of the container) in the form of “table”. In other words, FIG. 11 and FIG. 12 display the same experimental example.
In FIG. 12, the leftmost column indicates the measurement angle (the rotation angle of the second turntable 40, the center angle of the container), and the second column from the left indicates the linear gauge display value (the radial position of the outer peripheral surface of the container). ing.
The third column from the left (second column from the right) in FIG. 12 shows the “difference” in the linear gauge display value of the upper and lower adjacent cells (the cells in the table) shown in the second column from the left. The right column indicates the “difference” between the cells adjacent to each other in the third column from the left (second column from the right) (hereinafter sometimes referred to as “difference difference”).

As is clear from FIGS. 11 and 12, the absolute value of the “difference difference” (the rightmost column in FIG. 12) in the region other than the hagumi level difference 5d is the area of the hagumi level difference 5d (in FIG. 12, the linear gauge display value). In the column of (), the absolute value of the “difference difference” in the cell in which the underlined number is displayed) is smaller.
Therefore, if the absolute value of the “difference difference” is equal to or greater than the threshold value, it can be determined as a “brush step”.
On the other hand, when it is determined that a region where the absolute value of the “difference” between the linear gauge display values of the cells adjacent to each other in the upper and lower directions is equal to or greater than a threshold value is a hug step, the hug step may not be accurately recognized. An example is shown in FIG. In FIG. 22, the rotation angle is changed by 1 °, the threshold value is 0.003 mm, and the area where the absolute value of the “difference” between the cells adjacent to the upper and lower sides of the linear gauge display value is equal to or greater than the threshold value This is an example of judgment. In this case, the hagumi step extends over the region where the measurement angle is -7.5 ° to 3.5 °, and the linear gauge display value does not change abruptly. Judgment is not made, and the hug step is not accurately measured.
Even when the threshold value is set to 0.005 mm, the absolute value of “difference” is equal to or greater than the threshold value in the region where the measurement angle is −1.5 ° to −0.5 °, and Even a region that is an area of 5 ° to 3.5 ° and is not a hug step is determined to be a hug step, and the hug step is not accurately measured.
FIG. 23 shows the same measurement results as FIG. 22, and further shows “difference”. When the threshold value of “difference difference” is set to 0.003 mm, the hagumi step is a region having a measurement angle of 1.5 ° to 3.5 °, and the hagumi step is accurately measured.
A container having a hug step is a portion of the hug step, and thus the cross section in the horizontal plane is not a perfect circle. By rotating a container that is not a perfect circle in this way, the linear gauge display value changes even at portions other than the hug step, and the “difference” sometimes exceeds the threshold value. As described above, when “difference” is used as an index, a portion that is not a hagumi step may be determined as a hug step.
On the other hand, when “difference difference” is used as an index, “difference difference” is almost unaffected by changes in the linear gauge display value caused by the container not being a perfect circle. can do.

In the illustrated embodiment (examples shown in FIGS. 11 and 12), an area in which the “difference difference” (absolute value) is equal to or greater than a threshold value (0.003 mm or more) is determined as an area of the hug step 5d. Yes.
In FIG. 11, the hagumi step is a region indicated by a symbol δ.
The dimension δ of the hagumi level difference 5d is a linear gauge display value (FIG. 12) in an area where the “difference difference” (absolute value) is equal to or greater than a threshold value (0.003 mm or more). In the second column from the left) is a numerical value obtained by subtracting “minimum value” from “maximum value” (δ = “maximum value” − “minimum value”).
In the example of FIG. 12, the dimension δ of the hug step 5d is
δ = 0.067−0.003 = 0.064 mm
It is.

The mode of determining the position and dimension δ of the hug step 5d described above with reference to FIGS. 8 to 12 is the sub-control unit 50S built in the main control unit 50 shown in FIG. 1 (see FIG. 13: FIG. The sub-control unit 50S is not shown).
The configuration of the sub-control unit 50S will be described based on FIG. 13 with reference to FIGS.
In FIG. 13, the sub-control unit 50S includes a calculation block 52S, a comparison block 53S, a hagumi step area determination block 54S, a maximum / minimum value determination block 55S, a hagumi step calculation block 56S, and a storage device (main 57 shared with the control unit).

The arithmetic block 52S is connected to the linear gauge 64 via the line L12S and the interface 51, is connected to the comparison block 53S via the line L23S, and is connected to the storage device 57 via the line L27S. The calculation block 52S has a function of calculating the “difference difference” displayed in the rightmost column of FIG. That is, the difference between the position coordinate near the parting line on the outer peripheral surface of the container measured at every predetermined rotation angle of the turntable 40 and the position coordinate measured immediately before is calculated, and the numerical value immediately before the difference is calculated. It has a function of calculating a difference (difference difference).
The comparison block 53S is connected to the area determination block 54S of the toothpick step via a line L34S, and is connected to the storage device 57 via a bidirectional line L37S. The comparison block 53S has a function of comparing the “difference difference” (rightmost column in FIG. 12) calculated by the calculation block 52S with a threshold value.
The hagumi step area determination block 54S is connected to the maximum / minimum value determination block 55S via a line L45S, and is connected to the storage device 57 via a line L47S. The hagumi step region determination block 54S has a function of determining the region of the hagumi step 5d from the comparison result of the comparison block 53S.

The maximum value / minimum value determination block 55S is connected to the toothbrush level difference calculation block 56S via a line L56S, and is connected to the storage device 57 via a line L57S. The maximum value / minimum value determination block 55S determines the maximum value and the minimum value from the display value of the linear gauge 64 (the radial position of the outer peripheral surface of the container 5) in the region determined by the area determination block 54S of the hug step. Has a function to determine the value.
The hagumi step calculation block 56S is connected to the storage device 57 via a line L67S, and is connected to the display device 50M via an interface 58 and a line L68S. The toothbrush level difference calculation block 56S has a function of calculating the dimension δ of the toothbrush level difference 5d from the maximum value and the minimum value determined by the maximum value / minimum value determination block 55S.

Next, a procedure for determining the position (circumferential position) and the dimension δ of the hug step 5d will be described based on FIG. 14 and also with reference to FIGS.
In FIG. 14, in step S <b> 11, the radial position of the outer peripheral surface of the container 5 placed on the second table 40 is measured for each measurement angle in the region near the parting line PL, and the display value of the linear gauge 64 is displayed. Is input to the calculation block 52S in the sub-control unit 50S.
Then, the process proceeds to step S12, and the "difference difference" (the rightmost column in FIG. 12) is calculated by the calculation block 52S. In the next step S13, the comparison block 53S determines whether or not the “difference difference” (absolute value) exceeds the threshold value, and the “difference difference” (absolute value) exceeds the threshold value. The data (measurement data of the radial position of the outer peripheral surface of the container 5: data of the display value of the linear gauge 64) is extracted, and the data is sent to the storage device 57 for storage. Then, the process proceeds to step S14.

In step S14, the range of data stored in step S13 is determined as a “brush step area” by the hug step step determination block 54S.
In the next step S15, the maximum value of the display value of the linear gauge 64 (the radial position of the outer peripheral surface of the container 5) in the data (the data of the area of the hug step) stored in S13 by the maximum value / minimum value determination block 55S. And the minimum value are selected, and the process proceeds to step S16.
In step S16, the toothbrush level difference calculation block 56S determines the difference between the maximum value and the minimum value in step S15 as the dimension δ of the toothbrush level difference 5d (brush step difference amount) (maximum value−minimum value = brush step difference amount).

In the above-described procedure, all the data in the region where the “difference difference” (absolute value) exceeds the threshold is stored in the case where only a very narrow portion in the region of the hug step 5d protrudes in the radial direction. This is to prevent misidentification of the region of the hagumi step 5d in a case where there is a portion where the “difference” is constant in the region of the hagumi step 5d (that is, a case where the difference difference becomes zero).
That is, in the case where only a very narrow portion in the region of the hug step 5d protrudes in the radial direction, when not storing all the data of the region where the “difference difference” exceeds the threshold value, Only the protruding portion may be recognized as a hug step 5d. In addition, in the case where there is a portion where the “difference” is constant in the region of the hagumi step 5d, not all the data in the region where the “difference difference” exceeds the threshold value is stored, but only a part is stored. May be recognized that the portion where the “difference” is constant is not the hagumi step 5d, for example, when there is a portion where the “difference” is constant near the center of the region of the hagumi step 5d, There is a possibility that only a part of the original hug step 5d may be mistaken as the hug step 5d. In order to eliminate such a possibility of misidentification, the illustrated embodiment stores all data in the region where the “difference difference” (absolute value) exceeds the threshold value.

In the cases illustrated in FIGS. 11 and 12, the measurement angle (angular pitch measured by the linear gauge 64) at the time of measuring the step difference is “0.5 °”, and the absolute value of the “difference difference” The threshold value in is 0.003 mm, but the angle pitch and threshold value are not particularly limited as long as optimum values are appropriately set according to the size of the container to be measured. The above numerical values were set by experiments conducted separately by the inventors.
The inventor measured the hull level difference by the method described above while changing the angular pitch and the threshold value, and analyzed the result. The container to be measured has a body diameter of 49.1 mm, a diameter of 43 mm, and a height of 90 mm, and is a container having the shape of FIG. The measurement was performed 10 times per condition. The results are shown in FIGS. The unit of the measured value is mm.

According to the inventor's experiment, when the angle pitch was 0.5 °, the variation (standard deviation) in the measured value of the hug step was the smallest.
The angular pitch could be accurately recognized up to 3.0 °. However, when the angular pitch is larger (for example, when it is set to 5.0 °), the position of the hagumi step may not be accurately grasped, and the variation (standard deviation) of the measured value of the hug step is increased.
On the other hand, when the angle pitch is small (for example, 0.1 °), a region other than the hagumi step is misidentified as a hagumi step region, and the variation (standard deviation) in the measured value of the hug step is large. became.

From the inventor's experimental results, it has been found that if the angular pitch is 0.5 ° to 3.0 °, the hug step can be accurately determined.
In addition, in the experiment of the inventor, if the angular pitch is 0.5 ° to 3.0 °, good threshold level measurement is possible regardless of whether the absolute value of the “difference difference” is 0.003 mm or 0.004 mm. Was able to run.

Next, with reference to FIGS. 15-19, the measurement of the diameter dimension of each part of the container 5, a misalignment amount, and a height dimension is demonstrated.
Initially, with reference to FIG. 15, the measurement of a diameter dimension (dimension shown by the code | symbol I in FIG. 15) is demonstrated.
In FIG. 15, the light projecting unit 31 has a function of projecting (irradiating) a belt-shaped laser beam toward the light receiving unit 32. In FIG. 15, the belt-shaped laser beam is expressed as two line segments extending from the light projecting unit 31 in the direction of the arrow Lb. Here, in the present specification, the belt-shaped laser beam may be expressed by the symbol Lb.

  Measurement of the diameter I of the container 5 (diameter dimension at a predetermined height direction position of the container) is performed by irradiating the band-shaped laser beam Lb at the height direction position where the diameter dimension I is to be measured in the container 5 to be measured. And do it. Only the region that is not blocked by the container 5 and the fixing pin 33 is received by the light receiving unit 32, and the radial dimension I is measured as the region shielded by the container 5.

Next, measurement of the misalignment amount will be mainly described with reference to FIG.
The container 5 shown in FIG. 2 is manufactured with four molds (a mouth part mold, a bottom part mold, and a half part mold of the body part × 2).
When one of the molds is worn during the manufacture of the container, any of the center of gravity (core) of the mouth, the center of gravity (core) of the bottom, and the center of gravity (core) of the trunk is deviated from the original position. (Deviated) causes “core misalignment”. Here, in the container 5 shown in FIG. 2, there are three types of misalignment: a misalignment between the mouth and the trunk, a misalignment between the trunk and the bottom, and a misalignment between the mouth and the bottom.

As described above for the measurement of the diameter I of the container 5, the distance “L ₂ ” in FIG. 15 is the distance (interval) between the fixing pin 33 (the outer periphery) and the container 5 (the outer periphery).
Here, since the fixed pin 33 shown in FIG. 15 is fixed to the apparatus, the distance R from the center (rotation center) O _{20 of} the first turntable ₂₀ to the fixed pin 33 is a constant.

FIG. 16 shows a horizontal plane (horizontal cross section) at a predetermined height direction position of the container 5.
As shown in Figure 16, in the same height direction position of the container 5 (horizontal plane), the distance L _2, by 30 ° in the circumferential direction of the container 5, measuring 12 points (measurement points in 0 ° of FIG. 16 a) Measurement at measurement point a12 of 1 to 330 °.
At each measurement point of 12 (A1-A12), the distance from the center _{O 20} of the first turntable 20 until the circumference of the container 5 (Measurement Results: _{R-L 2)} obtained.

Next, as shown in FIG. 16, plotting is performed so that the measurement point a1 of 0 ° is located on the negative side (lower side in FIG. 16) of the y-axis. Then, the measurement points a1 to a12 are plotted, and the x axis coordinate and the y axis coordinate in FIG. 16 are obtained for each of the measurement points a1 to a12.
The origin 0 of the xy coordinate system in FIG. 16 is the center O _{20 of} the first turntable 20.
If the central angle at the measurement point (0 ° for measurement point a1 and 330 ° for measurement point a12) is θ,
x-axis coordinate = (R−L ₂ ) cos (θ−90 °)
y-axis coordinate = (R−L ₂ ) sin (θ−90 °)
It becomes.
In addition, (R−L ₂ ) is a measurement result at each of the twelve measurement points (a1 to a12).

After obtaining the x-axis coordinates and the y-axis coordinates at the twelve measurement points a1 to a12, the area and the center of gravity of the two adjacent measurement points and twelve triangles having the origin 0 in FIG. For example, when the measurement points a1 (x1, y1) and a2 (x2, y2) are selected as the two adjacent measurement points, the area and the center of gravity of Δ0-a1-a2 (the position indicated by the symbol Gc12 in FIG. 16) ) Is calculated. Such calculation is performed using any conventionally known method.
The calculation method is as follows, for example.
Area: S1 = (x1 * y2-x2 * y1) / 2
Center of gravity: xg1 = (x1 + x2) ÷ 3, yg1 = (y1 + y2) ÷ 3
If the areas and centroids of 12 triangles (two adjacent measurement points and the triangle with the origin 0 in FIG. 16 as the vertex) are obtained, the area of the dodecagon with the vertices a1 to a12 and the centroid of the dodecagon Are calculated using the area and the center of gravity of each of the 12 triangles.
The calculation method is as follows, for example.
Total area S = S1 + S2 + ... + S12
The center of gravity of the dodecagon xg = (xg1 × S1 + xg2 × S2 +... + Xg12 × S12) ÷ S
yg = (yg1 * S1 + yg2 * S2 + ... + yg12 * S12) / S

Here, by the above-described method, three types of centroids are obtained as the centroid of the container 5, the centroid of the container mouth, the centroid of the container bottom, and the centroid of the container trunk.
That is, the area and the center of gravity of each of the 12 measurement points (a1 to a12) adjacent to each other at the height direction position (horizontal plane) of the mouth of the container 5 and the 12 triangles having the origin 0 as the vertex are described above. Obtained by the method of Next, a dodecagonal center of gravity having a1 to a12 as vertices is obtained using the area and the center of gravity of the 12 triangles by the above-described method, and the center of the dodecagon is set as the center of gravity of the container mouth.
The center of gravity of the bottom of the container is obtained by calculating the area and the center of gravity of each of the 12 measurement points adjacent to the 12 measurement points in the height direction position (horizontal plane) of the container 5 and the 12 triangles having the origin 0 as a vertex. Hereinafter, similarly to the center of gravity of the container mouth, the center of gravity of the dodecagon is obtained, and the center of gravity of the dodecagon is set as the center of gravity of the bottom of the container.
The center of gravity of the container body is the area and the center of gravity of each of the 12 measurement points adjacent to the 12 measurement points and the 12 triangles with the origin 0 at the vertex in the height direction position (horizontal plane) of the body of the container 5. Hereinafter, similarly to the center of gravity of the container mouth, the center of gravity of the dodecagon is obtained, and the center of gravity of the dodecagon is set as the center of gravity of the container body.
Then, the center of gravity of the container mouth, the center of gravity of the bottom of the container, and the center of gravity of the container body are plotted in the same coordinate system, one center of gravity is set as the origin, and the remaining two on the coordinate system (horizontal plane). Find the position of the center of gravity. From the position of the remaining two centroids (the centroid not set as the origin) (the coordinate system or a position on the horizontal plane), the misalignment amount and its direction can be obtained.

In the main control unit 50 shown in FIG. 1, a functional block diagram of a structure for determining the misalignment of the container by the above-described method is shown as FIG.
In FIG. 17, the main control unit 50 includes a measurement result calculation block 52, a coordinate calculation block 53, a triangular area and centroid calculation block 54, an area and centroid calculation block 55 of a predetermined height position cross section of the container, a core. A deviation determination block 56 and a storage device 57 are provided.

The measurement result calculation block 52 is connected to the laser measuring instrument 30 via the line L12 and the interface 51, connected to the coordinate calculation block 53 via the line L23, and connected to the storage device 57 via the line L27. The measurement result calculation block 52 has a function of calculating the “RL ₂ ”.
The coordinate calculation block 53 is connected to the triangle area / centroid calculation block 54 via a line L34, and is connected to the storage device 57 via a line L37. The coordinate calculation block 53 has a function of calculating the x-axis coordinate and the y-axis coordinate of each of the twelve measurement points (a1 to a12).

The triangular area and barycentric calculation block 54 is connected to the area and barycentric calculation block 55 of the predetermined height position cross section of the container by a line L45, and is connected to the storage device 57 by a line L47. The triangle area and centroid calculation block 54 has a function of calculating the area and centroid of 12 triangles having two measurement points adjacent to the 12 measurement points a1 to a12 and the origin 0 in FIG. Yes.
The cross-sectional area and center-of-gravity calculation block 55 of the predetermined height position of the container is connected to the misalignment determination block 56 via a line L56, and is connected to the storage device 57 via a line L57. Then, the area and center of gravity calculation block 55 of the predetermined height position cross section of the container is a dodecagon having apexes a1 to a12 using the area and center of gravity of the 12 triangles obtained by the area and center of gravity calculation block 54 of the triangle. And the function of calculating the coordinates of the center of gravity of the dodecagon.
The misalignment determination block 56 is connected to the storage device 57 via a bidirectional line L67, and is connected to the display device 50M via the interface 58 via a line L68. Then, the center misalignment determination block 56 includes the center of gravity of the container mouth, the center of gravity of the bottom of the container, the center of gravity of the container body (the area of the predetermined height position cross section of the container and the predetermined height position cross section of the container calculated by the center of gravity calculation block 55). The center misalignment amount is obtained from the three center of gravity of the dodecagon.

The procedure for measuring the misalignment of the container 5 described with reference to FIG. 16 will be described with reference to FIGS. 1 to 17 mainly based on FIG.
In FIG. 18, in step S < _b > 1, the laser measuring device 30 measures the gap L ₂ (FIG. 15) between the outer periphery of the container 5 and the outer periphery of the fixing pin 33 (FIG. 15).
In the next step S2, the distance (measurement result: RL ₂ ) from the center O _{20 of} the first turntable ₂₀ to the circumference of the container 5 is calculated by the measurement result calculation block 52 in the main control unit 50. In step S3, the coordinate calculation block 53 calculates the X coordinate and the Y coordinate for each of the twelve measurement points a1 to a12 in FIG.

In the next step S4, the area and centroid calculation block 54 of the triangle calculates the 12 triangles comprising the two adjacent measurement points and the center O ₂₀ of the first turntable (the origin 0 of the xy coordinate system in FIG. 16). The area and the center of gravity are calculated, and the process proceeds to step S5.
In step S5, the area and center of gravity calculation block 55 of the predetermined height position cross section of the container uses the area and center of gravity of the twelve triangles obtained in step S4, and has a dodecagon (with the measurement points a1 to a12 as vertices ( The area and the center of gravity of the horizontal plane sectional dodecagon figure at the predetermined height position of the container 5 are calculated, and the process proceeds to step S6.
In step S6, in the misalignment determination block 56, one of the three centroids of the center of gravity of the mouth of the container 5, the center of gravity of the bottom of the container 5 and the center of gravity of the trunk of the container 5 is set to the origin 0 of the xy coordinate system. The center misalignment amount is determined from the positions of the remaining two centroids in the coordinate system (horizontal plane).
And control is complete | finished.

Next, with reference to FIG. 19, the measurement of the dimension of the container 5 in the height direction will be described.
In FIG. 19, the first turntable 20 and the first linear gauge 61 arranged above the first turntable 20 are used for measuring the height dimension of the container 5. The first linear gauge 61 has a gauge body 61a, a rod 61b extending on the extension of the axis of the gauge body, and a round bar 61c attached in the direction perpendicular to the rod 61b at the tip of the rod 61b.
When the first turntable 20 rises, the upper end of the mouth of the container 5 (the upper end of the container 5) comes into contact with the round bar 61c and presses the rod 61b upward against the gauge body 61a. The first linear gauge 61 has a function of measuring the dimension in which the round bar 61c and the rod 61b are pressed upward (relative to the gauge body 61a).

Since the distance between the position before the first turntable 20 is raised and the lowermost end of the round bar 61c is constant, the rising amount of the first turntable 20 and the upper end of the container 5 press the round bar 61c. Based on the obtained amount (measurement result of the first linear gauge 61: displacement amount of the linear gauge 61), the height direction dimension of the container 5 is obtained.
The first turntable 20 ascends by a predetermined distance for each type of container 5. Thereafter, when the linear gauge 61 moves horizontally and reaches the upper position of the container 5, it moves (lowers) in the vertical direction. The stroke amount (lowering amount) of the linear gauge 61 is a predetermined numerical value, but when the round bar 61c comes into contact with the container 5, the lowering stops. As a result, a difference occurs between the descending amount of the linear gauge 61 and the descending amount of the round bar 61c, and the height direction dimension of the container 5 is calculated from the result of calculating how much the difference is different from the reference value. . Here, the reference value is stored in the linear gauge 61 and its control system by measuring a master gauge whose dimensions are known before the start of measurement (calibration operation).

When measuring the height direction dimension of the container 5, the first turntable 20 can be configured to suck the bottom of the container 5 from below for the purpose of keeping the container 5 stable during measurement.
However, in the illustrated embodiment, the first turntable 20 does not suck the bottom of the container 5. When the bottom part of the container 5 is sucked, the sucked part of the bottom part is deformed, and the vicinity thereof (for example, the peripheral part of the container bottom part) rises upward toward the container. As a result, the dimension in the height direction of the container 5 is greatly measured by the increased amount.
Therefore, in the illustrated embodiment, the first turntable 20 does not suck the bottom portion of the container 5 from below, so that the “raised portion” does not occur.
When the measurement of the height dimension of the container 5 is completed on the first turntable 20, the container moving robot 10 lifts the container 5 and moves it to the second turntable 40.

According to the embodiment shown in the figure, the toothpick level difference 5d can be automatically and accurately measured. Therefore, when printing directly on the container 5, there is an inconvenience that “print skipping” occurs in the printed portion, and the container 5 is easily broken. The inconvenience of becoming can be prevented in advance.
Further, it is possible to determine the degree of wear of the mold by accurately measuring the hagumi step 5d.

Further, according to the illustrated embodiment, the amount of misalignment of the container 5 can be automatically measured accurately.
For this reason, it is possible to prevent inconvenience that the core 5 is misaligned, the thickness of a part of the container 5 is reduced, and a through hole is generated in the thin portion.
In addition, since the thickness of a part of the container 5 is prevented from being thinned, even when a load is applied from above and below when the container 5 is sealed, the container bends to the side where the thickness is thin. Therefore, the malfunction of the seal can be prevented.

According to the illustrated embodiment, for all measurements, the container 5 is “standing” (the mouth is above and the bottom is placed on the first turntable 20 or the second turntable 40). And the hagumi step 5d is also performed with the container 5 "standing".
Therefore, by placing the container 5 on the second turntable 40 and rotating the second turntable 40, data can be collected at every fixed angle of the center angle of the second turntable 40. Thus, in the manner described in the illustrated embodiment, it is possible to determine the misalignment amount and the hug step 5d.

In order to measure the container 5 in the “laying down” state (in which the body of the container 5 is in contact with the turntable), a device for putting the container 5 in the “laying down” state and the “laying down” state A device for rotating the container 5 at every fixed angle is required. For all measurements, the illustrated embodiment where the container 5 is “standing” does not require such a device.
In the illustrated embodiment, since the rotation mechanism of the container 5 is also used by the first turntable 20 or the second turntable 40, the configuration of the apparatus can be simplified correspondingly. As a result, the overall dimensions of the measuring device can be reduced.

It should be noted that the illustrated embodiment is merely an example, and is not a description to limit the technical scope of the present invention.
For example, the present invention is not only applied to the measurement of the container 5 as shown in FIG. 2 or FIG. 24, but can also be applied to containers of shapes other than those shown in FIG. 2 or FIG.
In the illustrated embodiment, the diameter of the container 5 is measured by irradiating the belt-shaped laser beam Lb. For example, an image of the container 5 is taken and the diameter of the container 5 is measured from the image. Is also possible.
Furthermore, in the illustrated embodiment, twelve measurement points are used in measuring the misalignment amount, but the number of measurement points can be arbitrarily set.

5 ... container 5P ... container pallet 5B ... container recovery box 10 ... container moving robot 20 ... first turntable 30 ... diameter measuring device / laser measuring device 40 ... Second turntable 50 ... main control unit 61 ... first linear gauge 62A ... second linear gauge 63B ... third linear gauge 64 ... fourth linear gauge 100 · ..Container measuring equipment

Claims (8)

A turntable on which the container is placed in an upright state;
An outer peripheral surface position measuring device for measuring the radial position of the outer peripheral surface of the container at a plurality of circumferential positions near the parting line of the container placed on the turntable and rotating;
Equipped with a control device,
The controller is
A function of determining whether or not there is a step from the amount of change in the measurement result of the outer peripheral surface position measuring device at each of a plurality of circumferential positions, and determining the circumferential position of the step;
A container measuring apparatus comprising a function of determining a step size of a step from a radial position of the outer peripheral surface of the container at a circumferential position of the determined step. When determining the circumferential position of the step, the control device, the position coordinates in the vicinity of the parting line of the outer peripheral surface of the container measured at each predetermined rotation angle of the turntable, the position coordinates measured immediately before A function to calculate the difference between the values immediately before the difference,
Comparing the absolute value of the difference with a threshold value, and having a function of determining the region where the difference is equal to or greater than the threshold value as the circumferential position of the step,
A function for selecting a maximum value and a minimum value of the position coordinates in an area where the difference is equal to or greater than a threshold when determining a step size;
The container measuring device according to claim 1, having a function of determining a difference between the maximum value and the minimum value as a step size.   The container measuring apparatus according to claim 2, wherein the predetermined rotation angle of the turntable is 0.5 ° to 3 °.   The container measuring apparatus according to claim 2 or 3, wherein the threshold value is 0.003 mm or more and 0.004 mm or less. A measuring step of measuring the radial position of the outer peripheral surface of the container at a plurality of circumferential positions in the vicinity of the parting line of the container placed and rotated in an upright state on the turntable by an outer peripheral surface position measuring device;
It is determined whether or not there is a step from the amount of change in the radial position of the outer circumferential surface of the container at a plurality of circumferential positions near the parting line of the container placed on the turntable measured in the measurement step. Step judgment process,
A step position determining step for determining a circumferential position of the step when it is determined in the step determining step that a step exists;
A container measuring method comprising a step dimension determining step of determining a step dimension of a step from a radial position of the outer peripheral surface of the container at a circumferential position of the step determined in the step position determining step. The step position determination process
Measuring the position coordinates of the container outer peripheral surface near the parting line for each predetermined rotation angle of the turntable;
Calculating the difference between the position coordinates of the container outer peripheral surface near the parting line and the position coordinates measured immediately before, and calculating the difference from the numerical value immediately before the difference;
Comparing the absolute value of the difference with a threshold value, and determining a region where the difference is equal to or greater than the threshold value as a circumferential position of the step,
The step size determination process
Selecting a maximum value and a minimum value of the position coordinates in an area where the difference is equal to or greater than a threshold;
The container measuring method according to claim 5, further comprising a step of determining a difference between the maximum value and the minimum value as a step size.   The container measuring method according to claim 6, wherein the predetermined rotation angle of the turntable is 0.5 ° to 3 °.   The container measuring method according to claim 6 or 7, wherein the threshold value is 0.003 mm or more and 0.004 mm or less.

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