JPH11334829A - Conveyor and weight measuring device using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the transporting force using a simple configuration and facilitate cleaning. SOLUTION: A friction part 14 having a certain width and continued in the belt moving direction is formed approx. in the center of a belt 12 on its rear surface 12b. The friction part 14 is provided, for example in the form of urethane coating, and this can increase the friction with rollers 11a and 11b and give a large transporting force to the belt 12. A receptacle table 10 has an oversurface 10a where an opening 20 is formed to avoid contact with the friction part 14. The opening 20 may consist of a groove etc., whereby the friction part 14 does not contact with the table 10 and does not drop the transporting force of the belt 12. The weight of the object placed on the belt 12 is measured by a weighting part when the belt 12 is moved and the object is positioned on the table 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveyor for transporting articles and a weighing apparatus equipped with the conveyor for weighing articles, and more particularly to a conveyor capable of easily exchanging belts and a weighing apparatus using the conveyor. .

[0002]

2. Description of the Related Art FIG. 4 is a perspective view showing a conveyor of a conventional weighing device. The weighing device 50 can measure the mass of the article by the weighing unit while transporting the article by driving the conveyor 51. The conveyor 51 includes a cradle 54,
It comprises a drive roller 55a and a driven roller 55b provided on both sides of the receiving table 54, and an endless belt 56 between these rollers 55a and 55b.

The conveyor 51 is mounted and fixed on a weighing section (not shown) (for example, a load cell), and the load cell weighs the entire conveyor 51 and the mass of articles. The weighing signal of the load cell is output to a calculation unit (not shown), and the weight of the article is obtained by subtracting the weight of the conveyor 51 in the calculation processing of the calculation unit.

In the above conveyor 51, a belt 56
In order to increase the transfer force, the friction between the receiving table 54 and the belt 56 is small, while the friction between the rollers 55a and 55b and the belt 56 is increased. For example, in order to reduce the friction between the cradle 54 and the belt 56, the surface of the cradle 54 is embossed, or a flat plate or a polymer sheet on which embossing is performed is attached.
In order to increase the friction between the rollers 55a and 55b and the belt 56, the surfaces of the rollers 55a and 55b are subjected to knurling.

[0005]

However, the pedestal 54 on which the embossing is performed cannot accurately bend the bent portion of the side plate due to the formed embossing, so that the processing accuracy is reduced or the screw hole is not formed. There have been problems such as a decrease in processing accuracy and a restriction in mounting screws. Further, in a configuration in which an embossed plate or a polymer sheet is stuck, the end of the stuck portion may peel off. This occurred when the conveyor was cleaned and was easily peeled off by cleaning. Further, with a polymer sheet or the like, cleaning with high heat may not be performed due to the characteristics of the resin. When the end of the sheet is peeled off, various bacteria grow on the peeled portion.

On the other hand, when the rollers 55a and 55b are subjected to unevenness processing, only the convex portions come into contact with the belt 56, so that there is a problem that the belt 56 is worn and durability is reduced. In addition, it was difficult to clean the rollers 55a and 55b due to the unevenness. As in the above, various germs easily propagate in the uneven portion. In particular, the conveyor must be kept clean when the weighing device weighs food,
This cannot be done with the above configuration.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a simple structure, which can increase the conveying force of articles, and which is easy to clean, and weighs the mass of the articles using the conveyor. It is an object of the present invention to provide a weighing device that performs measurement.

[0008]

In order to achieve the above object, a conveyor according to the present invention comprises an endless belt (12) having a predetermined width, and a pair of rollers (2) for supporting both ends of the endless belt. 11a, 11b) and a friction portion (14) having a higher friction coefficient on the back surface (12b) of the endless belt and having a friction coefficient higher than that of the back surface and continuing along the moving direction of the belt; It is characterized by having.

[0009] Further, as described in claim 2, a plurality of the friction portions (14) may be provided in a width direction of the belt (12).

[0010] The friction portion (14) may be provided at a central position of the belt (12).

The friction portion (14) may be formed by coating a back surface (12b) of the belt (12) with a friction material at a predetermined thickness.

Further, the friction portion (14) may be formed by welding a tape of a friction material to the back surface (12b) of the belt (12).

According to the weighing device of the present invention, an endless belt (12) having a predetermined width, a pair of rollers (11a, 11b) respectively supporting both ends of the endless belt, The rear surface (12b) is provided between the pair of rollers and a friction portion (14) having a friction coefficient higher than the friction coefficient of the rear surface and having a predetermined width continuous in the moving direction of the belt. A pedestal (10) for supporting the pedestal, and a weighing unit provided below the pedestal and weighing the mass of the article conveyed by the belt;
In a), an opening (20) for avoiding contact with the friction portion is formed at a position where the friction portion is arranged.

According to another aspect of the present invention, the opening (20) of the pedestal (10) has a substantially concave groove in the pedestal corresponding to the position of the friction portion (14). (21) may be formed.

According to an eighth aspect of the present invention, the opening (20) of the pedestal (10) has an opening (20) opened in the pedestal corresponding to the position of the friction portion (14). 24).

According to the above configuration, the rollers 11a, 11b
And the friction portion 14 provided on the back surface 12b of the belt 12 comes into contact with a predetermined frictional force. Thereby, the roller 1
When the rollers 1a and 11b rotate, the rollers 11a and 11b
Thus, the belt 12 can be moved with a high conveying force.
On the other hand, an opening 20 is formed on the upper surface 10 a of the receiving table 10 to avoid contact with the friction portion 14, so that the conveying force of the belt 12 is not reduced. The friction portion 14 is a belt 1
The second back surface 12b can be easily formed by coating a friction material.

[0017]

FIG. 1 is a view showing a first embodiment of a weighing device according to the present invention. FIG. 1A is a plan view, and FIG. 1B is a front view. In these figures, the conveyor 1 at an upper position, which is a main part of the weighing device, is described.

The conveyor 1 includes a receiving table 10 having a predetermined width and length, and driving rollers 1 provided at both ends of the receiving table 10.
1a, a driven roller 11b, and these rollers 11a, 11
It is substantially constituted by an endless belt 12 stretched between b. The pedestal 10 is formed by bending a plate body, and the upper plate 10a
And the side plates 10b at both ends in the width direction. Cradle 10
Inside, are provided bars and the like in the vertical and horizontal directions as necessary. On the upper plate 10a of the cradle 10, the back surface 1 of the belt 12
2b come into contact and support the load of the moving article placed on the surface 12a of the belt 12.

The pair of rollers 11a and 11b are formed in a cylindrical shape, are rotatable about a rotating shaft 11c, and support the belt 12 with a predetermined tension. The peripheral surfaces 11d of these rollers 11a and 11b are formed flat without irregularities. When the rotation shaft 11c of the driving roller 11a is driven to rotate by a driving unit (not shown),
The belt 12 is transported and moved in the corresponding direction, and the driven roller 11
Rotate b.

The belt 12 is made of a canvas made of polyester, and the entire back surface 12b is coated with a thin urethane coating. The rear surface 12b is provided with a friction portion 14 having a predetermined width continuously in the transport direction as shown. The friction portion 14 is formed by coating a predetermined friction material. In this embodiment, the friction portion 14
Was formed with a urethane coating. The thickness of the coating is about 100 μm. Alternatively, a urethane sheet may be welded as a friction material of the friction portion 14.

The friction portion 14 is provided substantially at the center of the belt 12 in the conveying direction. Friction part 14
Is provided at substantially the center position, the transmission of the conveying force to the belt 12 is stabilized. The surface 12 of the belt 12
A predetermined holding part 13 is provided on the entire surface a. The holding portion 13 is formed by coating urethane on the surface 12a to a predetermined thickness. As a result, the surface 12a (the holding portion 1)
3) The displacement of the articles placed thereon is prevented.

Then, on the upper surface 10a of the receiving table 10,
An opening 20 is formed at a portion facing the friction portion 14 to avoid contact with the friction portion 14. The opening 20 in this embodiment is provided with a concave groove 21 having a predetermined width and depth and continuous in the transport direction as shown in FIG.
Is formed. The concave groove 21 is wider than the width of the friction portion 14 and has a depth that does not contact the friction portion 14. The concave groove 21 is formed by bending the upper surface 10a of the receiving table 10, as shown in FIG.

Although not shown, a weighing section is provided below the pedestal 10, and the weighing section weighs the entire conveyor 1 and the mass of articles. The weighing unit 8 includes, for example, a load cell and an electronic balance. The weighing signal of the weighing unit is output to an arithmetic unit (not shown), and based on the weighing signal when the article placed on the belt 12 is positioned on the receiving table 10, the arithmetic unit performs arithmetic processing on the conveyor 1 The weight of the article is determined by subtracting the weight of the article.

According to the weighing device having the above structure, the back surface 12b of the belt 12 stretched by the pair of rollers 11a and 11b.
, A friction portion 14 is formed and comes into contact with the peripheral surface 11d of the rollers 11a and 11b. And rollers 11a, 11b
And the friction portion 14 contact with a high frictional force. As a result, the rotational force of the drive roller 11a can be transmitted and converted to the transport force of the belt 12 without loss (for example, without slip), and a large transport force can be secured by the belt 12.

On the other hand, the upper surface 10a of the receiving table 10 has
1 is formed and does not contact the friction portion 14, so that there is no friction between the cradle 10 and the belt 12, and the conveyance force is not hindered.

Since the friction portion 14 is formed to be thin (100 μm) by urethane coating, it is possible that a convex portion protrudes from the surface 12a of the belt 12 in contact with the rollers 11a and 11b at the portion where the friction portion 14 is formed. Absent. In addition, since there is no unevenness in each part even in cleaning after removing the belt 12, cleaning and the like can be performed easily and reliably.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 1A is a plan view, and FIG. 1B is a front view. As shown, on the back surface 12b of the belt 12,
The friction portions 14 are provided in two rows in the width direction. Correspondingly, the receiving table 10 has a groove 2 for avoiding contact with the friction portion 14.
1 are provided in two rows. The receiving table 10 does not contact the friction portion 14 by the concave groove 21 and does not hinder the conveying force of the belt 12. When the friction portions 14 are provided in two or more rows in plural rows, the contact between the rollers 11a and 11b and the friction portions 14 can be more reliably performed. Here, by arranging the rows of the friction portions 14 uniformly in the width direction of the belt 12,
Transmission of the conveying force from the rollers 11a and 11b to the belt 12 is stabilized.

Next, a third embodiment of the present invention will be described.
In this embodiment, the configuration of the opening 20 formed in the receiving table 10 is changed. The opening 20 is provided as a space for retracting the receiving table 10 so as not to contact the friction portion 14.
Therefore, another example of the configuration of the opening 20 is not limited to the concave groove 21.

For example, as shown in the plan view of FIG. 3, an opening 24 slightly wider than the width of the friction portion 14 may be formed on the upper surface 10a of the receiving table 10. This opening hole 2
4 can be formed with a predetermined length, instead of being formed over the entire length of the receiving table 20 as shown in the figure. In this case, a part of the friction portion 14 is partly on the upper surface 10a of the cradle 10 (locations A1, A
2), but if it is a part, the friction part 14 and the pedestal 1
The friction between the belt 12 and the belt 12 is low, and the conveyance force of the belt 12 is not affected. The same applies to the case where the opening 20 is a groove 21 instead of the opening 24.

The opening 20 (the concave groove 21 or the opening hole 24) may be provided over the entire length of the upper surface 10a of the pedestal 20. In this case, the rigidity of the pedestal 10 is maintained. A reinforcing member such as a crosspiece is provided at least in the width direction. For example, the side plates 10b, 10b are connected and fixed to each other by the reinforcing member. Further, the opening 20 is not limited to a single location as shown in the figure, but may be configured to have openings at a plurality of locations along the length direction of the friction portion 14.

In the above embodiment, the friction portion 14 is
The rear surface 12b of the belt 12 is formed by coating with a friction material. Not limited to this, the friction portion 14 may be configured to weld a sheet of friction material (for example, one having a thickness of 0.2 mm) to the back surface 12b of the belt 12.

In each of the above embodiments, the conveyor 1
Described the configuration provided in the weighing device for weighing the articles. However, the first object of the present invention is to increase the conveying force of the belt 12. That is, the conveyor 1 of the present invention
Can be applied to a general-purpose conveyor device including only a pair of rollers 11a and 11b and a belt 12. Also in this case, the pair of rollers 11a, 11b
In contrast, the friction portion 1 provided on the back surface 12b of the belt 12
4, a high conveying force can be obtained.

[0033]

According to the conveyor of the present invention, a friction portion having a friction coefficient higher than the friction coefficient of the rear surface of the belt and having a predetermined width continuous in the belt conveying direction is provided on the rear surface of the belt. Therefore, it is possible to increase the frictional force between the rotating roller and the belt to obtain a high conveying force. This friction portion can be easily formed simply by applying a urethane coating having a predetermined thickness on the back surface of the belt, for example. According to the weighing device of the present invention, a high conveying force can be obtained by the configuration using the conveyor having the friction portion on the back surface of the belt. On the other hand, since the opening for avoiding contact with the friction portion is formed in the receiving stand for weighing the articles, the articles can be weighed without reducing the conveying force of the belt. Further, since the friction portion is formed on the back surface of the belt, there is no need to perform special processing on the rollers and the cradle, and cleaning can be easily performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main part of an embodiment of a weighing device of the present invention.

FIG. 2 is a diagram showing a second embodiment of the present invention.

FIG. 3 is a plan view showing a third embodiment of the present invention.

FIG. 4 is a perspective view showing a conventional weighing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Conveyor, 10 ... Receiving stand, 10a ... Upper surface, 11a ... Drive roller, 11b ... Follower roller, 12 ... Belt, 12b
… Back side, 14… friction part, 20… opening, 21… concave groove, 2
4: An opening hole.

Claims (8)

[Claims] An endless belt having a predetermined width.
A pair of rollers (11a, 11b) respectively supporting both ends of the endless belt; and a back surface (12b) of the endless belt having a friction coefficient higher than a friction coefficient of the back surface. A friction portion (14) having a predetermined width continuous in the moving direction. 2. The friction part (14) is provided with the belt (1).
2. The conveyor according to claim 1, wherein a plurality of the conveyors are provided in the width direction. 3. The belt (1), wherein the friction portion (14) is
2. The conveyor according to claim 1, wherein the conveyor is provided at the center position of (2). 4. The belt (1) is provided with the friction portion (14).
The conveyor according to claim 1, wherein the back surface (12b) of (2) is coated with a friction material at a predetermined thickness. 5. The belt (1), wherein the friction portion (14) is
The conveyor according to claim 1, wherein a tape of a friction material is welded to the back surface (12b) of (2). 6. An endless belt (12) having a predetermined width.
A pair of rollers (11a, 11b) respectively supporting both ends of the endless belt; and a back surface (12b) of the endless belt having a friction coefficient higher than a friction coefficient of the back surface. A friction portion (14) having a predetermined width continuous in the moving direction; a pedestal (10) provided between the pair of rollers to support the belt; A weighing unit for weighing the mass of the article to be weighed, and an opening (20) on the upper surface (10a) of the cradle at a position where the friction unit is disposed to avoid contact with the friction unit. A weighing device characterized in that a weighing device is formed. 7. An opening (20) of the cradle (10)
7. The weighing device according to claim 6, wherein a substantially concave groove (21) is formed in the receiving table corresponding to the position of the friction portion (14). 8. An opening (20) in the cradle (10),
The weighing device according to claim 6, wherein the weighing device is an opening hole (24) opened in the pedestal corresponding to an arrangement position of the friction portion (14).