JP2003156403A - Seal inspecting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal inspection machine inexpensively and efficiently the seal of merchandise. SOLUTION: In the device for inspecting seal of bagged products by press operation, clearance H between a carrier conveyer 11 for conveying the products G and a persser unit 33 installed above it, is made to be narrower than height Hg of the products G, and the pressor unit 33 is connected to a servomotor 71. Condition of the seal of the merchandise G is checked by detecting upward displacement of the pressor unit 33 upon carrying in the products G, while controlling adequately the pressing force against the products G by the servomotor 71.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal check device for checking the seal of a packaged product, and relates to the field of product inspection technology.

[0002]

2. Description of the Related Art Generally, for products in which contents such as snacks are packed in a packaging bag, the contents of the packaging bag may be deteriorated quickly due to defective sealing of the packaging bag. A seal check is performed to inspect the seal condition.

At that time, the conventional product seal check is performed by pressing the packaging bag from above and applying pressure. That is, when the product is properly sealed, even if it is pressed, the air in the bag does not leak to the outside, and the member pressing the product receives a substantially constant reaction force from the product. Therefore, the stroke of the pressing member or the pressing reaction force acting on the pressing member does not change, and when the product is not properly sealed, the air in the bag is removed by the pressing force of the pressing member. It leaks to the outside, the packaging bag of the product shrinks, and the stroke and pressing reaction force of the pressing member change. The seal check of the product is performed by detecting the stroke of the pressing member and the changing state of the pressing reaction force when the packaging bag is pressed from above.

In recent years, in a seal check device adopting the above-mentioned inspection method, for example, Japanese Patent Laid-Open No. 8-169.
As disclosed in Japanese Unexamined Patent Publication No. 424, there is known a device that detects a hermetic defect of a container in advance in the process of transferring a sealed container while pressing and pinching the container from above and below with a belt unit. Here, a force sensor provided at a fixed position of the belt unit outputs a reaction force based on the internal pressure of the air when the container is pressed, and when this output becomes equal to or less than a set value, it is determined as an airtight defect. ing.

[0005]

However, in the above seal check device, a special detection device such as a force sensor has to be purposely provided, and there has been a problem that the facility cost is high. Furthermore, the height of the product is limited because the spacing between the upper and lower belts is fixed. Therefore, when the products having different heights are conveyed, there is a problem that it is necessary to readjust the distance between the two belts each time.

Therefore, an object of the present invention is to solve the above problems and to provide an apparatus for efficiently checking the seal of a product at low cost.

[0007]

The present invention is characterized by having the following constitution in order to solve the above problems.

First, the invention according to claim 1 of the present application (hereinafter referred to as the first invention) is a seal check device for performing a seal check of a packaged product by a pressing operation, and the product conveying means and the product. And a holding member that holds and presses the holding member, and when the product is carried in, the distance between the holding member and the conveying means is narrower than the height of the product, and the product is carried over to the upper side of the holding member. It is characterized by having a servo motor for detecting the amount of displacement.

The invention according to claim 2 (hereinafter, referred to as the second
(Invention) is characterized in that, in the first invention, a pressing force control means for controlling a pressing force when the holding member presses a product is provided.

The invention according to claim 3 (hereinafter, referred to as the third
In the first invention or the second invention,
It is characterized in that a stopper means for restricting the lowering of the holding member is provided.

The invention according to claim 4 (hereinafter, referred to as the fourth
In the second invention, the pressing force control means is provided with a storage means for storing the pressing force for each product, and the pressing force control means is based on the pressing force stored in the storage means. It is characterized by controlling.

The invention according to claim 5 (hereinafter referred to as the fifth
In any one of the first to fourth inventions, the nipping member is provided with a second conveying means having a driving force for conveying an article in cooperation with the conveying means. And

The invention according to claim 6 (hereinafter, referred to as the sixth
(Invention) is characterized in that, in the fifth invention, the second conveying means is capable of changing the shape of the conveying surface.

The invention according to claim 7 (hereinafter referred to as the seventh
In the above fifth invention or sixth invention,
The carrying surface of the second carrying means is a flat surface.

The invention according to claim 8 (hereinafter,
(Invention), in any one of the fifth invention to the seventh invention, is a belt in which the conveying surface of the second conveying means is a mesh shape, and supports the belt, and through the belt. A large number of grooves are provided on the pressing surface of the belt supporting member that presses in a direction different from the conveying direction.

The invention according to claim 9 (hereinafter referred to as the ninth
In one of the first to eighth inventions, at least one of the sandwiching member and the conveying means is detachable.

Furthermore, the invention according to claim 10 (hereinafter,
The tenth invention) is characterized in that, in any one of the first invention to the ninth invention, the servomotor is arranged above the holding member.

The invention according to claim 11 (hereinafter,
An eleventh invention) is the same as in any of the first to ninth inventions, characterized in that the servomotor is arranged below the conveying means.

According to the above configuration, the following effects can be obtained.

First, according to the first aspect of the present invention, it is provided with a product conveying means and a holding member for holding and pressing the product, and
When the product is carried in, since the distance between the holding member and the conveying means is smaller than the height of the product, the holding member is pushed up by the product.

Since the servo motor detects the amount of upward displacement of the sandwiching member after the product is loaded, no special equipment such as a displacement sensor is required.

Further, according to the second aspect of the invention, since the pressing force control means for controlling the pressing force when the holding member presses the product is provided, it is possible to properly press the product.

Further, according to the third invention, since the stopper means for restricting the lowering of the holding member is provided,
The holding member can be held at the bottom dead center with a simple structure such as the stopper means.

Further, according to the fourth invention, a storage means for storing the pressing force for each product is provided, and the pressing force control means is based on the pressing force stored in the storage means. Since the pressing force is controlled, it becomes possible to quickly set the pressing force according to the goods to be carried in.

On the other hand, according to the fifth aspect of the invention, since the holding member is provided with the second conveying means having a driving force for conveying the goods in cooperation with the conveying means, the goods are further stabilized. It will be sandwiched and inserted smoothly into the seal check device.

Further, according to the sixth aspect of the invention, since the second carrying means can change the shape of the carrying surface,
The carrying surface can be changed according to the goods to be carried in.

According to the seventh aspect of the invention, since the carrying surface of the second carrying means is a flat surface, the product is properly held between the second carrying means and the carrying means. It will be pressed.

According to the eighth aspect of the invention, at least the transport surface of the second transport means is a mesh belt, which supports the belt and supports the belt through which the product is pressed. Since a large number of grooves are provided on the pressing surface of the member in a direction different from the conveying direction, for example, even if a product with small holes or tears is carried into the seal part, the seal part presses the above-mentioned part. When the product is loaded so as to face the surface, an escape path for air or the like in the bag of the product is secured through the mesh-shaped belt or the groove provided on the pressing surface of the belt support member.

According to the ninth aspect of the invention, since at least one of the sandwiching member and the conveying means is detachable, it is easy to change the configuration of the sandwiching member and the conveying means according to the goods to be carried in. At the same time, workability such as cleaning and maintenance of the holding member and the conveying means is improved.

Further, according to the tenth aspect of the invention, since the servomotor is arranged above the holding member,
The connecting mechanism provided between the sandwiching member and the servomotor is also arranged above the sandwiching member.

According to the eleventh aspect of the invention, since the servo motor is arranged below the conveying means,
The weight and the like of the connecting mechanism that is loaded on the servo motor in the support structure of the holding member is reduced.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

As shown in FIG. 1, the seal check device 1 in this embodiment is a product G in which contents are packed in a bag.
Upstream transport conveyor C1 for transporting the product G and downstream transport conveyor C2 for transporting the product G to the next work station.
And a seal check is performed while the product G carried in from the upstream transfer conveyor C1 is continuously transferred, and then the product G is transferred to the downstream transfer conveyor C2.
It is configured to be shipped to.

The seal check device 1 is provided with a lower transfer conveyor 11. The lower transfer conveyor 11 is configured such that an endless transfer belt 15 is wound around a pair of rollers 13 and 14 rotatably supported by the side frame 12. A lower conveyor drive motor 17 is attached to the frame 16. A timing belt 20 is wound around a pulley 18 mounted on the output shaft 17a of the motor 17 and a pulley 19 mounted coaxially with the roller 14 on the terminal end side. The driving force of 17 is transmitted to the roller 14.

It should be noted that pins 21 ... 21 are projectingly provided at four positions on the front, rear, left and right sides of the side frame 12 along the conveying direction of the product G. Corresponding to this, the pin receiving members 22 having a leaf spring function at four positions on the front, rear, left and right of the frame 16 ...
22 are attached, the pins 21 ... 21 are fitted to the members 22 ... 22 from above, and the lower conveyor 11 is detachably supported by the frame 16.

A pressing unit 31 is arranged above the lower transfer conveyor 11 so as to face each other. The pressing unit 31 includes a main body 32 arranged above and a pressing member 33 arranged below to press and convey the product G while sandwiching and clamping the product G between the main body 32 and the main body 32. The pressing member 33 is the four connecting links 34, 34 attached to the front, rear, left and right along the transport direction.
35 and 36 (only 34 and 35 are shown in FIG. 1). These connecting links 34, 34, 35, 3
Reference numeral 6 constitutes a parallel link mechanism with a fulcrum on the side of the main body 32 and a fulcrum on the side of the pressing member 33, and the pressing member 33 is supported so as to be movable in parallel with respect to the main body 32.

As shown in FIGS. 1 and 2, the pressing member 33 includes an upper conveyer 37 for conveying a product while sandwiching it with the lower conveyer 11, and the conveyer 37.
A pair of left and right conveyor support frames 38, 38 for supporting the
It has and.

The upper conveyor 37 has a pair of left and right side frames 39, 39 whose upper end is inclined upward. Three rollers 40 to 42 are rotatably provided on the frames 39, 39. An endless conveyor belt 43 is wound around 40 to 42.

The conveyor belt 43 has a mesh shape. Further, a belt receiving member 44 that supports the conveyor belt 43 is attached to the lower portions of the side frames 39, 39, and the pressing surface of the belt receiving member 44 that presses the product G via the conveyor belt 43 is Product G
A large number of grooves (not shown) that are inclined in a direction different from the transport direction of are formed. With such a configuration, even if the product G having minute holes or tears is carried into the seal portion, if the product G is carried so that the seal portion faces the pressing surface, a mesh shape is obtained. An escape path for air or the like in the bag of the product G is secured through the grooves formed on the pressing surfaces of the conveyor belt 43 and the belt receiving member 44. Therefore, when the product G is pressed by the pressing member 43, the air and the like in the bag of the product G surely leaks to the outside through the escape path, so that holes and tears are not overlooked.

On the other hand, a belt pressing roller 45 is provided on the starting end side of the conveyor supporting frames 38, 38.
The roller 45 is provided so as to press the conveyor belt 43 of the upper conveyor 37 when the upper conveyor 37 is connected to the conveyor supporting frames 38, 38, so that the conveyor belt 43 has a proper tension. 40 ~
It is stretched between 42. On the other hand, when the connection between the upper transfer conveyor 37 and the conveyor support frames 38, 38 is released, the transfer belt 43 is released from the pressing by the belt pressing roller 45 and is slackened so that it can be easily removed from the upper transfer conveyor 37. become.

The attaching / detaching mechanism provided between the upper conveyor 37 and the conveyor supporting frames 38, 38 will be described with reference to FIGS. 1 and 3.

First, on the upper part of the belt receiving member 44 provided on the upper conveying conveyor 37, bolt tightening members 46 ... 46 are provided upright at four positions on the front, rear, left and right.
46 are respectively screwed with knob bolts 47. Further, on the upper portion of the belt receiving member 44, mounting members 48, 48 are provided upright at two places on the left and right sides.
The hook bodies 49a and 49a which constitute the connecting locks 49 and 49 are attached to 8 and 48, respectively.

Then, the conveyor supporting frames 38, 38
At the lower part of the front, left, right, left
a ... 38a is formed. Further, the hook bodies 49a, 4 are provided on the lower portions of the conveyor support frames 38, 38.
9a, connecting rings 49b, 49b and connecting levers 49c, 49c constituting the connecting locks 49, 49, corresponding to 9a.
And are integrated and attached.

When the upper transfer conveyor 37 is connected to the conveyor support frames 38, 38, the upper transfer conveyor 37 is moved from the state shown by the chain line to the state shown by the solid line in the direction of arrow a (see FIG. 3) to Bolts 47a, 47 of knob bolts 47 ... 47 provided on the conveyor 37
38a is engaged with the notches 38a formed on the conveyor support frames 38, 38. Then, the connecting rings 49b, 49b are engaged with the hook bodies 49a, 49a,
The connecting locks 49, 49 are locked by operating the operation lever portions 49c, 49c. Further, by tightening the knob bolts 47 ... 47 in this state, the upper conveyor 37 is reliably connected to the conveyor supporting frames 38, 38. Further, with this configuration, the connection between the upper transport conveyor 37 and the conveyor support frames 38, 38 can be easily released.

On the other hand, in the main body 32, the pressing member 33
An upper conveyor drive motor 51 for driving the upper conveyor 37 provided in the above is accommodated.

As shown in FIGS. 1 and 2, the motor 5 is
The first timing belt 55 is wound around the pulley 52 mounted on the first output shaft 51a and the pulley 54 mounted on one end of the shaft 53 provided on the main body 32. Further, the pulley 56 assembled to the other end of the shaft 53 and the connecting frame 3
The second timing belt 5 is provided between the shaft 57 and the pulley 58 assembled to one end of the shaft 57.
9 is wrapped around. The third timing belt 62 is wound around the pulley 60 mounted on the other end of the shaft 57 and the pulley 61 mounted coaxially with the roller 42 on the terminal end side of the upper conveyor 37. ing. As a result, the driving force of the upper conveyor drive motor 51 is equal to the first to third timing belts 55, 5
The upper conveyer 37 is driven by being transmitted to the roller 42 via 9, 62.

The lower conveyor 11 and the upper conveyor 37 are constructed such that the respective conveyor belts 15 and 43 are driven at the same speed, and the product G is stably supported on both belts 15 and 43. It is pinched and transported.

A servo motor 71 for detecting the amount of displacement of the pressing member 33 based on the pressing reaction force acting on the pressing member 33 when the product G is pressed is housed in the main body 32.

As shown in FIGS. 1 and 2, one end of a first connecting member 72 is fixed to the shaft 71a of the servomotor 71, and the other end of the first connecting member 72 is a first end. It is attached to one end of the 2 connecting member 73. The other end of the second connecting member 73 has a third connecting member 74.
Attached to one end. Further, the other end of the third connecting member 74 is fixed to a shaft 75 provided on the main body 32. The pair of left and right connecting links 34, 34 (only one of which is shown in FIG. 1) has upper ends fixed to both ends of the shaft 75, and lower ends provided on the conveyor support frames 38, 38. It is attached to the shaft 76.

On the other hand, a pair of left and right separate connecting links 35,
The upper end of 36 is attached to both ends of a shaft 53 provided on the main body 32, and the lower end is attached to a shaft 57 provided on the conveyor support frames 38, 38.

When the shaft 71a of the servo motor 71 is rotated, the first connecting member 72 has an arrow b with the shaft 71a as a fulcrum.
Direction, the second connecting member 73 moves in the direction of arrow c, the third connecting member 74 rotates in the direction of arrow d, and
The connecting links 34, 34 rotate in the arrow e direction with the shaft 75 as a fulcrum, and the connecting links 35, 36 with the shaft 53 as a fulcrum.

By pressing the product G, the pressing member 33
When the pressing member 33 is displaced upward by the pressing reaction force acting on the connecting links 34, 34, 35, 36 and the first
The rotational force corresponding to the amount of displacement of the pressing member 33 acts on the shaft 71a of the servo motor 71 via the third connecting members 72 to 74.

The servo motor 71 outputs a rotational force in the direction of pulling up the pressing member 33 via the above-mentioned link mechanism, but the force is set so as not to exceed the own weight of the pressing member 33. .

The connecting links 34, 34, 35, 36
Among them, the connecting link 35 is the other connecting link 34, 34, 3
The shape is longer than that of No. 6. When the pressing member 33 descends to a predetermined position, the connecting link 35
The movement of the pressing member 33 is restricted by abutting the upper end of the stopper 77 provided in the vicinity thereof.

Next, an elevating mechanism for elevating the pressing unit 31 to adjust the space between the pressing member 33 and the lower conveyor 11 will be described.

As shown in FIGS. 1, 2 and 4, the pressing unit 31 is attached to the base member 81 via three mounting members 82 ... 82 which are provided between the main body 32 and the base member 81. Cantilevered.

Two guide rods 85, 85 are provided between the upper fixed frame 83 and the lower fixed frame 84.
And one screw shaft 86 are installed. The guide rods 85 and 85 are attached to the base member 81.
It is inserted in each of the linear bearings 87, 87. A female screw block 89 attached to the base member 81 via a bracket 88 is screwed onto the screw shaft 86. The screw shaft 86 includes bearings 90 and 91 provided on the upper and lower fixed frames 83 and 84, respectively.
And is rotatably attached to the upper and lower fixed frames 83 and 84.

With the above construction, when the screw shaft 86 rotates, the female screw block 89 moves up and down as shown by the arrow f, and the pressing unit 31 supported by the linear bearings 87, 87 moves up and down. The rotation of the screw shaft 86 is performed manually.

Further, as shown in FIG. 1, a product detection sensor 101 (101a, 101b) is provided between the upstream side conveyer C1 and the lower conveyer 11. The sensor 101 includes, for example, a light emitting unit 101a arranged above, and a light receiving unit 101b arranged below and detecting a light beam projected from the light emitting unit 101a. The sensor 101 detects the carry-in of the product G into the seal check device 1 when the product G is carried into the lower transport conveyor 11 and the product G is blocked from the path of the light beam projected from the light emitting unit 101a. .

Next, the control system of the seal check device 1 will be described.

As shown in FIG. 5, this control system is provided with a control device 111 for generally controlling the operation of the seal check device 1. The control device 111 includes a memory 111a for storing various data and a CPU 111b for executing various arithmetic processes, and the CPU 111b is the upper conveyor drive motor 5
A control signal is output to the first and lower conveyor drive motors 17 to control the transfer speed of both transfer conveyors 37 and 11. Further, the CPU 111b sends and receives a signal to and from the servo motor 71 to drive the servo motor 71, thereby controlling the up-and-down movement of the pressing member 33, and pressing based on a signal fed back from the servo motor 71. The pressing reaction force acting on the member 33 and the displacement amount of the pressing member 33 are detected. Also, the CPU 11
1b inputs the signal from the product detection sensor 101,
Based on this, a temporal starting point for detecting the displacement amount of the pressing member 33 is set.

The memory 111a has a servo motor 71 for pulling up the pressing member 33 for each product G.
Various control parameters such as the rotational force of the are stored.

Next, an operation example of the seal check device 1 will be described with reference to FIGS. 6 and 7.

First, by manually rotating the screw shaft 86 of the elevating mechanism, the pressing unit 31 is moved up and down via the female screw block 89, and the space between the pressing member 33 and the lower transport conveyor 11 is set to the initial position H0. set. Further, when the product number is specified, the CPU 111b in FIG.
Various control parameters corresponding to this, for example, the pulling force of the pressing member 33 by the servo motor 71 and the like are read out to initialize various operating conditions (step S1).

By providing the above-mentioned lifting mechanism,
The seal check device 1 according to the present embodiment can be used to inspect an arbitrary product G.

When the product G is carried in from the upstream side conveyor C1, the product detection sensor 101 detects the product G (step S2), and the CPU 111b which has input the detection signal,
The detected time t0 is set as the temporal starting point.

In this case, the distance H between the pressing member 33 and the lower conveyor 11 is set narrower than the height Hg of the product G as shown in FIG. It is pushed up by the product G. Therefore, the pressing member 33 does not have to be moved up and down every time the product G is carried in, and the inspection speed can be increased.

Then, when the product G is carried in from the upstream side transfer conveyor C1, the product G plunges between the upper transfer conveyor 37 and the lower transfer conveyor 11, both of which have a driving force, so that the product G is smoothly moved. Will be introduced. Further, in the case where only the lower transfer conveyor 11 has a driving force, when the lightweight product G is carried in, it is difficult to synchronize the transfer belt 15 and the product G at the introduction portion, but the upper transfer conveyor 37 having a driving force is provided. Since the product G is sandwiched between them, the product G can be stably introduced.

Further, the side frames 39, 39 are inclined upward at the starting end side, so that the goods G to be carried in can be more smoothly introduced into the pressing member 33 without being impacted. Therefore, damage to the product G is avoided.

Further, since the conveyor belt 43 provided on the upper conveyor 37 has a flat conveyor surface, the damage to the product G can be further avoided.

Further, since the lower transfer conveyor 11 is detachably attached to the frame 16, workability such as cleaning and maintenance is improved.

Since the upper conveyor 37 is easily attached to and detached from the conveyor supporting frames 38, 38, the flat belt type conveyor according to the product G is used instead of the mesh belt type conveyor used in the present embodiment. A conveyor, roller conveyor, rope belt conveyor, etc. can be selected and replaced.

Now, the pushing member 33 is pushed by the rushed product G.
Is pushed up, the connecting links 34, 34, 35, 3
6 and the first to third connecting members 72 to 74, the rotational force corresponding to the change in the height H of the pressing member 33 acts on the shaft 71a of the servo motor 71, and the servo motor 7
The displacement detection function of 1 detects a change in the height H of the pressing member 33 (step S3).

It should be noted that the servo motor 71 has the pressing member 33.
Although the rotational force is output in the direction of pulling up, the force is set so as not to exceed the weight of the pressing member 33. Therefore, the pressing member 33 appropriately presses the product G without breaking the bag, so that the normality or abnormality of the seal can be accurately detected. Then, in order to keep the pressing force of the pressing member 33 on the product G constant, careful control of the rotational force of the servo motor 71 may be performed.

In FIG. 6, the time t0 when the product detection sensor 101 detects the product G carried in from the upstream side conveyor C1 is set as the starting point of the elapsed time 0, and the servo motor 7 is used.
The change in the height H of the pressing member 33 detected by 1 is shown with the passage of time t. In the figure, the solid line (1) is the case of the product G having a normal seal, while the broken line (2) is the case of the product G having an abnormal seal and having a hole or a tear in the bag.

When the product G rushes in, a normal shocking reaction force acts on the pressing member 33, so that the change in height of the pressing member 33 has a peak as indicated by an arrow g in the figure, and then the normal state. In the case of the product G with a bad seal, a substantially constant height indicated by the arrow h is detected when the predetermined time t1 elapses as shown by the solid line (1), while in the case of the product G with an abnormal seal, the product with a broken line (2) Thus, the decrease in height indicated by the arrow i is detected.
Then, after a lapse of substantially the predetermined time t2, the product G passes through the pressing member 33, and the pressing member 33 released from the pressing reaction force acting is lowered by its own weight, and the initial position H
Return to 0.

If the height change amount ΔH of the pressing member 33 includes an abnormal change in the height indicated by the arrow g at the initial stage of pressing, the sealability will be erroneously determined. Therefore, the predetermined times t1 and t2 are set by the preparatory work performed in advance, and the CPU 111b causes the pressing member 3 in the data acquisition time range between the predetermined time t1 and the predetermined time t2.
A height change amount ΔH of 3 is calculated (step S4).

Then, based on the height change amount ΔH calculated in step S4, it is determined whether the seal is normal or abnormal. That is, it is determined whether or not the height change amount ΔH is less than or equal to a preset reference value ΔH0 (step S5),
If it is determined that the height change amount ΔH is less than or equal to the reference value ΔH0, it means that the seal of the product G is normal.

Next, the product G passes through the pressing member 33 (step S6), the pressing member 33 descends to the initial position H0 by its own weight (step S7), and waits for the inspection of the product G to be carried in next.

On the other hand, if it is determined in step S5 that the height change amount ΔH exceeds the reference value ΔH0, it means that the seal of the product G is abnormal, and an error signal is output (step S8). Go to S6.

FIG. 6 shows the height change amount Δ in the case of the solid line (1).
An example is shown in which H is smaller than the reference value ΔH0 (not shown) and is normal, and height variation ΔH ′ in the case of the broken line (2) is larger than the reference value ΔH0 and abnormal.

Although the servo motor 71 is arranged above the pressing member 33 in the above embodiment, the present invention is not limited to this and may be arranged below.
In that case, since the weight of the pressing unit 31 is reduced,
The driving load of the lifting mechanism for lifting the pressing unit 31 is reduced.

Further, in the above-mentioned embodiment, the time t0 when the product G is detected by the product detection sensor 101 is set as the starting point in time, but the product detection sensor 101 is not used, and is shown by an arrow g in FIG. Height H of pressing member 33
The time t0 that is the starting point may be determined by detecting the peak of. In that case, by detecting the height H of the pressing member 33, it is preset which height or more is set as the peak, and the height H of the pressing member 33 exceeds this set height. The time is set to t0.

[0084]

As described above, according to the first invention of the present application, first, the product is provided with a carrying means and a holding member for holding and pressing the product, and when the product is carried in, the holding member is provided. Since the space between the carrier and the conveying means is narrower than the height of the product, the holding member is pushed up by the product. Therefore, it is not necessary to move the holding member to press the product each time the product is loaded,
Speed up seal check.

Since the servo motor detects the amount of upward displacement of the sandwiching member after the product is loaded, no special equipment such as a displacement sensor is required.

Further, according to the second aspect of the present invention, since the pressing force control means for controlling the pressing force when the holding member presses the product is provided, the product can be appropriately pressed. Therefore, a highly reliable seal check is realized.

Further, according to the third invention, since the stopper means for restricting the lowering of the holding member is provided,
With a simple structure such as the stopper means, the holding member can be held at the bottom dead center. Therefore, for example, since it is not necessary for the servo motor to hold the bottom dead center of the sandwiching member, the drive load of the servo motor is reduced and power saving is realized.

According to the fourth aspect of the invention, the storage means for storing the pressing force for each product is provided, and the pressing force control means is based on the pressing force stored in the storage means. Since the pressing force is controlled, it becomes possible to quickly set the pressing force according to the contents of the product to be carried in, the packaging material, the sealing strength, and the like. Therefore, when switching products, it is possible to quickly set appropriate conditions according to the products to be carried in.

According to the fifth aspect of the invention, the nipping member is provided with the second conveying means having a driving force for conveying the goods in cooperation with the conveying means. It will be sandwiched and inserted smoothly into the seal check device. Therefore, since the product is stably transported during the seal check, the reliability of the seal check is improved.

Particularly, when the distance between the sandwiching member and the conveying means is narrower than the height of the product, the peak of the pressing reaction force generated at the time of entry of the product G indicated by the arrow g in FIG. 6 becomes low. Accordingly, it becomes easy to secure the time required for the seal check, that is, the data acquisition time. As a result, stable seal check becomes possible. In addition, since the impact on the product is small when the product is introduced, damage to the product is avoided, and the impact by the product is small, so the durability of the holding member is improved.

Further, according to the sixth aspect of the invention, since the second carrying means can change the shape of the carrying surface,
The carrying surface can be changed according to the goods to be carried in. Therefore, the product is properly sandwiched and pressed by the second transport means and the transport means,
Product damage is further prevented.

According to the seventh aspect of the invention, since the carrying surface of the second carrying means is a flat surface, the product is properly held between the second carrying means and the carrying means. It will be pressed. Therefore, damage to the product when the holding member contacts the product is further prevented. In particular, when the distance between the sandwiching member and the conveying means is narrower than the height of the product, the above configuration is effective, and the impact on the product when the product is introduced can be further avoided.

According to the eighth aspect of the invention, the transport surface of the second transport means is a mesh belt, and the belt support member supports the belt and presses the product through the belt. Since a large number of grooves are provided in the pressing surface in a direction different from the conveying direction, for example, when a product having a minute hole or a break in the sealing part is carried in, the sealing part is pressed against the pressing surface. When the products are loaded so as to face each other, an escape path for air or the like in the bag of the products is secured through the mesh-shaped belt or the groove provided on the pressing surface of the belt support member. Therefore, when a product with an abnormal seal is pressed by the sandwiching member, the air in the bag of the product leaks out to the outside through the escape route, so the seal abnormality is not overlooked and the seal check is performed. Improves reliability.

According to the ninth aspect of the invention, since at least one of the holding member and the conveying means is detachable, it is easy to change the structure of the holding member and the conveying means according to the goods to be carried in. At the same time, workability such as cleaning and maintenance of the holding member and the conveying means is improved.

Further, according to the tenth invention, since the servomotor is arranged above the holding member,
The connecting mechanism provided between the sandwiching member and the servomotor is also arranged above the sandwiching member. Therefore, for example, when the transporting means is provided below the sandwiching member so as to face each other, the connection mechanism can be configured so as not to be interposed between the sandwiching member and the transporting means. As a result, workability such as cleaning and maintenance of the holding member and the transporting means is improved.

According to the eleventh aspect of the invention, since the servomotor is arranged below the conveying means,
The weight of the connecting mechanism loaded on the servo motor in the support structure of the holding member is reduced. Therefore,
For example, when the sandwiching member is moved up and down in order to adjust the distance between the sandwiching member and the conveying means, the driving load of the lifting mechanism is reduced and the lifting speed can be increased. Further, since the capacity of the servo motor becomes small, it is effective in cost reduction. Further, since only the sandwiching member is arranged above the product, the foreign matter mixing into the product due to the foreign substance falling from above the product is reduced.

[Brief description of drawings]

FIG. 1 is a layout diagram of a seal check device according to an embodiment of the present invention.

FIG. 2 is an enlarged arrow view taken along the line A-A in FIG.

FIG. 3 is an enlarged view of a main part for explaining a mechanism for attaching and detaching a pressing member.

FIG. 4 is an enlarged arrow view taken along the line EE of FIG.

FIG. 5 is a diagram showing a control system of the apparatus.

FIG. 6 is a diagram showing the relationship between the height of a pressing member and the elapsed time.

FIG. 7 is a flowchart showing an operation example of the apparatus.

[Explanation of symbols]

1 Seal check device 11 Lower transport conveyor (transport means) 33 Pressing member (clamping member) 37 Upper transport conveyor (second transport member) 71 Servo motor 111 Control device (pressing force control means) 111a memory (storage means) G product

Claims (11)

[Claims] 1. A seal check device for performing a seal check of a packaged product by a pressing operation, comprising a conveying means for the product and a holding member for holding and pressing the product, and carrying in the product. At this time, the distance between the holding member and the conveying means is narrower than the height of the product, and a servo motor for detecting the upward displacement of the holding member after the product is carried in is provided. Seal check device to do. 2. The seal check device according to claim 1, further comprising pressing force control means for controlling a pressing force when the holding member presses a product. 3. The seal check device according to claim 1, further comprising stopper means for restricting the lowering of the holding member. 4. A storage means for storing the pressing force for each product is provided, and the pressing force control means controls the pressing force based on the pressing force stored in the storage means. The seal check device according to claim 2, which is characterized. 5. The sandwiching member is provided with a second transporting unit having a driving force for transporting a product in cooperation with the transporting unit. Seal check device according to any one. 6. The seal check device according to claim 5, wherein the second conveying means is capable of changing the shape of the conveying surface. 7. The seal check device according to claim 5, wherein the transport surface of the second transport means is a flat surface. 8. The carrying surface of the second carrying means is a mesh belt, which supports the belt and
8. The pressing surface of a belt supporting member that presses a product via the belt is provided with a large number of grooves in a direction different from the conveying direction. Seal check device. 9. The seal check device according to claim 1, wherein at least one of the sandwiching member and the conveying means is detachable. 10. The seal check device according to claim 1, wherein the servo motor is arranged above the holding member. 11. The seal check device according to any one of claims 1 to 9, wherein the servo motor is arranged below the conveying means.