JP5998501B2 - Paper cup flange level difference measuring instrument and measurement method - Google Patents

Description

  The present invention relates to a cup flange step measuring device and a measuring method for easily measuring a step generated in a flange portion formed by winding an upper edge portion into an opening during molding of a paper cup.

In forming a paper cup, a cup-shaped paper container having a flange at its caliber is formed using a body member blank and a bottom member punched to a predetermined size.
The frustoconical paper cup (20) shown in FIG. 3 has a body part (21) composed of a body member (21a) and a bottom part (23) composed of a bottom member (23a) bonded to the lower part thereof, Further, a flange (22) formed by winding the upper part of the body member outward is formed in the upper edge diameter part of the body part (21).

In many cases, the flange (22) is flattened by crushing up and down by a method such as ultrasonic pressure bonding so that it can be easily sealed by covering with a lid after filling the contents.
In this case, in the flange portion (22a) which hits the upper portion of the back portion where the body member is overlapped on both sides and bonded in a cylindrical shape, the body member is overlapped by the thickness of the adjacent portion and the body member due to the overlap of the body member. A difference in level will appear and a step will appear on the top surface.
Such a step on the upper surface of the flange causes a sealing defect such as a gap between the cover member and the flange when the cover member is covered and crimped, or a bond between the cover member and the flange becomes defective. It may be a cause.

An example of a method for forming such a paper cup from a blank will be described with reference to FIGS. 3 and 4A.
First, one side edge of the trunk member blank (21a) is set to the inner surface side and overlapped with the other side edge to form a trunk portion bonding portion (backing portion) at the position of the glue margin. A cylindrical body member (21) is used.

  The outer surface of the periphery of the bottom member (23a) is joined to the lower inner surface of the body member (21), and the lower end edge of the body member is bent inward so as to cover the periphery, and the periphery of the bottom member An annular leg is formed by joining to the inner surface of the part.

Further, the upper peripheral edge of the body member (21) is wound outward one or more times, and a flange portion (22) is formed at the position of the caliber portion to form a paper cup (20).
As described above, the flange portion is not limited to a configuration in which the upper peripheral edge is wound outward one or more times, and further, the flange portion may be pressure-bonded from above and below to flatten the upper surface.

Usually, since the flange portion is formed by winding the upper end edge of the body member into the opening, a step portion due to the thickness of the paper of the base material is generated at the flange portion (22a) above the backrest portion.
Therefore, when the cover material is overlapped on the upper surface of the flange and heat-sealed as it is, there is the above problem that the sealing cannot be surely performed because of the step portion. In particular, when the flange portion is crushed into a flat state in order to ensure the sealing with the lid member, the influence of the thickness of the base material is large.

In order to solve these problems, Patent Document 1 proposes eliminating the stepped portion by the shape of the body member. For example, notch portions having different shapes and sizes are provided at both upper end portions of the body member blank (see FIG. 4B), or the upper surface of the flange portion is flattened by means such as ultrasonic crimping to ensure sealing of the lid material. It is means such as.

In the method disclosed in Patent Document 1, since the body member (21a) uses a body member blank provided with notches (26) at both upper edges, the upper periphery of the body member is moved outward. When the flange portion is formed by being wound around one turn or more, the paper base is also in the overlapping state similar to the portion other than the bonding portion in the bonding portion, so that the level difference in the flange portion is eliminated. be able to.
Moreover, if the shape of the notch part of the both ends provided in this trunk | drum member blank is made into a different shape, even if the upper surface of a flange part is made flat, the level | step difference which arises on a flange part upper surface can be eliminated.

However, depending on the settings of the paper cup molding machine and the flange crusher, the level difference on the upper surface of the flange may not be eliminated to a necessary extent.
In order to solve these problems, it is first necessary to accurately measure the step on the flange top surface that occurs in the process. However, while conventional measuring instruments such as surface roughness meters are versatile, For the purpose of measuring a specific part of a specific shape, there are some devices that are difficult to introduce in terms of the complexity and price of the device.
From the above circumstances, there has been a demand for an apparatus that can easily measure the level difference in the manufacturing process in order to manage the level difference on the upper surface of the flange before sealing the paper cup.

JP2008-222245

  An object of the present invention is to provide an apparatus that can easily measure the level difference in the manufacturing process in order to manage the level difference on the upper surface of the flange before sealing the paper cup.

The invention according to claim 1 of the present invention has a contact-type measuring needle fixed to the lower surface of the tip, supported by a tension spring from above, and a lever that rotates up and down around a fulcrum;
A stopper provided on the top and bottom of the lever to regulate the range of movement of the lever;
A measurement unit including a non-contact displacement sensor that detects the displacement of the lever in the vertical direction;
A paper cup flange level difference measuring device characterized in that the flange comprises a workpiece transfer lever for moving and rotating a circular paper cup to a predetermined position.

The invention according to claim 2 of the present invention is
The tip of the measuring needle has an acute angle having at least one inclined surface, and the inclined surface is arranged so as to face the rotating direction of the flange portion in contact with the measuring needle. The paper cup flange level difference measuring instrument according to Item 1.

The invention according to claim 3 of the present invention is
3. The paper cup flange level difference measuring device according to claim 1, wherein the measuring unit has a function of transmitting data detected by the displacement sensor to an external data recording device.

The invention according to claim 4 of the present invention uses the paper cup flange level difference measuring instrument according to any one of claims 1 to 3, and uses a paper cup having a circular flange supported by the workpiece transfer lever as a measuring needle and an upper surface of the flange. When the tip of the measuring needle moves up and down according to the irregularities on the top surface of the circular flange of the paper cup, the lever to which the measuring needle is fixed rotates up and down around the fulcrum. The paper cup flange level difference measuring method is characterized in that a non-contact type displacement sensor detects the operation of the lever, sends measurement data to an external recording device, and determines whether the product is good or defective.

  According to the paper cup flange level difference measuring instrument of the present invention, the contact cup is supported by a tension spring from above and is pivoted up and down around a fulcrum, and the contact type measuring needle fixed to the lower surface of the tip of the lever makes the minute measurement of the upper surface of the paper cup flange. By tracing the displacement and detecting the vertical movement of this lever with a non-contact displacement sensor, it is possible to stably detect the step on the upper surface of the paper cup flange and send the measurement data to an external recording device. (See FIG. 1).

With the position of the contact-type measuring needle for measuring displacement constituting the measuring section fixed, the paper cup to be measured moves in the horizontal direction, so that the measuring needle is in contact with the flange. Since it is a structure that measures the unevenness of the flange surface while maintaining it, the measuring part itself has almost no moving parts, and linearity of movement of the measuring part is not required, so it is used as a normal surface roughness meter The structure can be made simpler than that (see FIG. 2A).
Flange of the paper cup top is because circular, by rotating the paper cup, the unevenness of the upper flange surface at necessary range can be easily measured.

  Rather than directly detecting the fine irregularities on the top surface of the flange, the movement of the lever with the measuring needle is detected by a non-contact sensor, so use a general sensor such as an optical sensor or ultrasonic sensor as the sensor. It is also possible to enlarge and capture the displacement by setting the detection position of the lever displacement away from the fulcrum.

  The measuring needle has an acute angle with at least one inclined surface, and the measuring needle is arranged so that the inclined surface faces the moving direction of the flange portion in contact with the measuring needle. It is possible to make it difficult to catch on the step on the upper surface of the flange portion, and to further improve the measurement accuracy (see FIGS. 2A and 2B).

  The measurement unit has a function to send the data detected by the displacement sensor to an external data recording device. It can be used for daily management by a method such as saving to a PC.

By storing the data of this result and storing the record in an external data recording device, it becomes possible to see the basis of the process improvement necessary for the paper cup manufacturing process and the result at any time.
In addition, if there is an abnormality in the measurement result, it can be immediately noticed, and the data obtained from the step measurement can quickly recognize a change or abnormality in the machine. As a result, the loss can be minimized. Therefore, waste of time and materials can be reduced.

  As described above, according to the paper cup flange level difference measuring instrument of the present invention, it is possible to easily measure during the manufacturing process in order to manage the level difference on the flange upper surface before sealing the paper cup without using a complicated and expensive device. It can be set as the apparatus which can do.

The simplified block diagram which shows one Example of the paper cup flange part level | step difference measuring device of this invention. The partial block diagram which shows the measurement part of the paper cup flange part level | step difference measuring device of this invention. (A) is a measurement state, (B) is a perspective view (left) and a sectional view (right) of a measurement needle. Paper cup schematic. Top view and side view. Paper cup blank schematic. (A) No top notch and (B) Top notch.

Embodiments of the paper cup flange level difference measuring instrument of the present invention will be described below with reference to the drawings.
FIG. 1 is a simplified configuration diagram showing an embodiment of a paper cup flange level difference measuring device according to the present invention, and FIG. 2A is a schematic cross-sectional view of the vicinity of a measuring needle of an embodiment of the paper cup flange level difference measuring device according to the present invention. . Further, FIG. 4B shows a perspective view (left) and a sectional view (right) showing the shape characteristics of the tip of the measuring needle.

  As shown in FIG. 1, the paper cup flange level difference measuring instrument of the present invention has a contact-type measuring needle (2) fixed to the lower surface of the tip, and is supported from above by a tension spring (5). ) Around the lever (1), a stopper (6) provided above and below the lever (1) to restrict the range of movement of the lever (1), and the lever (1) in the vertical direction A paper cup flange step comprising: a measuring section having a non-contact type displacement sensor (3) for detecting displacement; and a work conveying lever (11) for moving and rotating the paper cup (10) to a predetermined position. It is a measuring instrument.

  In order to measure the step on the upper surface of the flange (9) of the paper cup (10) using the paper cup flange step measuring instrument of the present invention, the paper cup (10) supported by the work transport lever (11) is used as the measuring needle (2). The flange (9) is moved in the horizontal direction so as to rotate along the flange (9) in a state where the upper surface is in contact.

At this time, the tip of the measuring needle (2) slides up and down on the flange upper surface of the paper cup (10) and moves up and down according to the unevenness of the flange upper surface.
As a result, the lever (1) rotates in the vertical direction around the fulcrum (7), and the displacement sensor (3) detects the operation of the lever (1) and sends the measurement data to the external recording device (4). .

For example, a threshold value is provided in advance in the external recording device (4), and it is possible to confirm whether the daily container dimensions are normal or abnormal by comparing the measurement data with a non-defective product and a defective product.
Measurement data from the displacement sensor (3) sent to the external recording device (4) can be digitized and stored in the device for daily data management.

  As shown in FIGS. 1 and 2, the contact-type measuring needle (2) fixed to the lower surface of the tip of the lever (1) has at least one inclined surface (13) at the tip of the measuring needle (2). It has an acute angle and is arranged so that the inclined surface (13) faces in the direction in which the flange (9) in contact with the measuring needle (2) moves.

  With this arrangement, when the paper cup (10) is rotated and slid while the measuring needle (2) is in contact with the upper surface of the flange portion (9), the needle, for example, at a step (14) on the flange surface. Can be prevented from being caught by the flange, and it is possible to avoid a situation such as breakage of needles or mixing of abnormal data due to jumping.

  The measuring needle (2) may be provided with a plurality of inclined surfaces, and depending on the accuracy required for measurement, the tip portion may be rounded with a rounded shape. The dimensions and material of the measuring needle (2) are determined in consideration of the required measurement range and the slipperiness of the flange (9).

The lever (1) that pivots up and down around the fulcrum (7) has a stopper (6) that regulates the range of vertical movement up and down, and holds the vertical position of the lever approximately in the middle of the regulation range. A tension spring (5) is provided from above for adjustment so that the weight of the downward direction at the time of measurement does not become excessive.

The tension spring (5) is adjusted with an appropriate tension so that the lever (1) is in contact with the upper surface of the flange (9) while the lever (1) is in contact with the upper surface of the flange portion (9), and its weight is almost cancelled. The measurement needle (2) is set so as not to be embedded in the surface to be measured.
There are no particular restrictions on the dimensions and materials of the stopper (6) and the tension spring (5), as long as the operation of the lever (1) can be adjusted appropriately.

As the non-contact type displacement sensor (3) for detecting the vertical displacement of the lever (1), a normal sensor such as an optical sensor can be used, and the step on the upper surface of the flange portion is detected as the displacement of the lever (1) surface. It is sufficient that the accuracy required for the purpose of measurement is obtained.
Further, the displacement sensor (3) is a non-contact type, and the installation position can be freely selected. However, when the displacement sensor (3) does not have a data analysis function, the displacement sensor (3) also serves to send detection data to the external recording device (4). As for the data transfer method and apparatus, ordinary transfer means can be used.

A work conveying lever (11) for moving and rotating the paper cup (10) to a predetermined position, and a function of rotating the paper cup (10) at the lower part of the measurement unit during measurement until the measurement start and measurement end of one paper cup; And a function of moving the paper cup (10) to the lower part of the measurement unit.

Depending on the frequency of measurement, the latter function of the workpiece transfer lever (11) for moving the paper cup (10) to the lower part of the measuring part and discharging it from the lower part of the measuring part can be omitted.
The workpiece transport lever (11) is of a known type if the paper cup (10) can be gripped and rotated horizontally at the bottom of the measuring unit, for example, the surface is gripped from three sides with a rubber rotating roll and rotated by a motor. The method can be selected according to the required speed and accuracy.

  When the paper cup (10) is placed at the lower part of the measuring unit by the workpiece transfer lever (11), the grip of the workpiece transfer lever does not maintain the stability of the horizontal plane, and the upper surface of the flange (9) swings up and down during measurement. In such a case, the paper cup can be moved or rotated on the plate (12) having excellent flatness.

  As described above, by using the paper cup flange level difference measuring instrument of the present invention, a simple measurement is performed during the manufacturing process in order to manage the level difference of the flange upper surface before sealing the paper cup without using a complicated and expensive device. It will be possible.

  The paper cup flange level difference measuring instrument of the present invention is useful not only as a paper cup but also as an inexpensive management device that can be easily used when measuring the level difference of a paper container or a plastic molded product.

DESCRIPTION OF SYMBOLS 1 ... Lever 2 ... Measuring needle 3 ... Displacement sensor 4 ... External storage device 5 ... Tensile spring 6 ... Stopper 7 ... Supporting point 8 ... Back sticking step 9 ... Flange 10 ... Paper cup 11 ... Work conveyance lever 12 ... Plate 13 ... Inclined surface 14 ... Step 20 ... Paper cup 21 ... Body 21a ... Body member 22 ... Diameter 22a ... Flange portion 23a above the back portion ... Bottom member 26 ... Top cutout 27 ... Bottom cutout portion 28 ... Paste allowance

Claims (4)

A lever that has a contact-type measuring needle fixed to the lower surface of the tip, is supported by a tension spring from above, and rotates up and down around a fulcrum.
A stopper provided on the top and bottom of the lever to regulate the range of movement of the lever;
A measurement unit including a non-contact displacement sensor that detects the displacement of the lever in the vertical direction;
A paper cup flange level difference measuring device comprising a workpiece conveying lever for moving and rotating a paper cup having a circular flange to a predetermined position.   The tip of the measuring needle has an acute angle having at least one inclined surface, and the inclined surface is arranged so as to face the rotating direction of the flange portion in contact with the measuring needle. Item 2. A paper cup flange level difference measuring instrument according to item 1.   The paper cup flange level difference measuring device according to claim 1 or 2, wherein the measuring unit has a function of transmitting data detected by the displacement sensor to an external data recording device. Using the paper cup flange level difference measuring instrument according to any one of claims 1 to 3, the flange supported by the work transport lever is moved in a horizontal direction in a state where the upper surface of the flange is in contact with the measuring needle, When the tip of the measuring needle moves up and down according to the irregularities on the upper surface of the circular flange of the paper cup, the lever to which the measuring needle is fixed pivots up and down around a fulcrum, and the operation of the lever is non-contact type. A method for measuring a step difference in a paper cup flange, characterized in that a displacement sensor detects and sends measurement data to an external recording device to determine whether the product is good or defective.

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