JP2001010709A - Belt conveyor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the straight traveling performance of a belt by correcting displacement and meandering of the belt with simple structure by tiltably supporting at least one roller freely within a surface parallel with a conveying surface in a device for carrying articles with rotation of an endless belt wound between rollers. SOLUTION: This belt conveyor device such as a label attaching device provided with two pairs of labelers in upper and lower parts is provided with a belt conveyor B1 having a belt 10b1 wound between a driving roller 13 and a roller 16. When difference in the tensile force is generated between a left and a right edges of the belt 10b1 by friction and change with the lapse of time, a displacement of the belt 10b1 occurs in the cross direction. Namely, at a roller 16 side, the belt 10b1 is displaced to a stronger tensile force side. Since the tensile force is strong at edges, the roller 16 is turned around a core adjusting bearing 30, and a displaced side of the belt 10b1 is tilted to the driving roller 13 direction, and a roller axis L is changed in a range of gradient movable angle α, and a displacement of the belt 10b1 is thereby automatically corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt conveying device for conveying an article such as a commodity on an endless belt.

[0002]

2. Description of the Related Art Heretofore, as one use of a belt conveying device, it has been adopted as a conveying means of a label sticking device. In such a case, the both ends of the endless belt are wound around rollers, and by rotating the belt, an article such as a product on the belt is moved to a label applicator, so that a label is automatically attached to the article. Make up. Although the conveying device using the above-mentioned belt has an advantage of being inexpensive, there is a case where a difference occurs in the belt length at the left and right side edge portions due to abrasion of the belt material or aging. In that case, a difference in tension occurs between the left and right side edges due to the difference in belt length,
This causes the belt to shift or meander to the side where the tension is strong, and as a result, there has been a problem that the transport state of the product is not stable and the label affixing position varies.

[0003]

In order to solve the above problem, for example, as disclosed in Japanese Patent Application Laid-Open No. 55-98016, it is possible to detect a belt displacement or the like with a sensor and correct it. In such a case, the use of the sensor is undesirably high in cost. It is also known that the shape of one of the rollers for winding the belt is a double-inclined or hourglass shape in which the diameter at the center in the axial direction is maximized and the diameter at both ends is reduced. However, in order to obtain a sufficient meandering correction effect by using only the roller, it is necessary to increase the inclination. In this case, the transport surface becomes uneven and the belt is deteriorated. There was no.

The present invention has been made in view of the above circumstances, and has as its object to provide an inexpensive conveying apparatus which can correct a belt shift or meandering and secure straight traveling performance with a simple structure by solving the problems. It is assumed that. The present invention also provides
In particular, an object of the present invention is to provide a belt conveying device suitable as a product conveying means of a label sticking device.

[0005]

According to the present invention, there is provided a belt conveying device for conveying an article on a belt by rotating an endless belt wound between rollers. At least one roller is rotatably supported, and the axis of the roller is tiltably supported in a plane parallel to the transport surface, that is, the roller is supported so as to be variable in angle. Accordingly, when the belt is displaced (deviation) to one side in the axial direction on the roller, since the tension of the side edge is strong, the roller is tilted to move the displaced side of the belt toward the other roller. To change the angle of the axis. The roller can be tilted, that is, a spherical bush or a self-aligning bearing is adopted as a means for supporting the roller at a variable angle, and the fulcrum position for changing the angle is not particularly limited. Is provided with an aligning bearing inside a substantially central portion in the axial direction so as to be tiltable. Thereby, while the member for supporting the tilting of the roller has a structure built in the roller,
The roller smoothly tilts around a substantially central portion in the axial direction as a fulcrum.

In the above, it is preferable that the other roller, that is, the driving roller is also a roller capable of correcting meandering or the like. In this case, a roller structure capable of tilting as described above may be freely used. However, in such a structure, the driving mechanism of the roller is complicated, so that
It is preferable to use a roller structure in which the roller itself does not tilt, such as a double-inclined or hourglass roller (a so-called crown-type roller) in which the diameter at the axial center is maximized and the diameter at both ends is reduced. This makes it possible to employ a stable driving mechanism as in the conventional case. In addition, if the belt transport device of the present invention is a route for transporting articles,
It is optional to apply the present invention not only to the transport path of the label attaching apparatus (claim 4) but also to various transport paths such as a stretch packaging machine.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings, in the case of a belt conveying device B incorporated in a label sticking device A. 1 and 2 show an overall view of a label sticking apparatus A, and this label sticking apparatus A exemplifies a case in which a label is automatically attached to a confectionery bread packaged in vinyl. The label pasting device A has two sets of labelers 1a, 1b and 2a, 2b juxtaposed above and below a belt conveying device B for pasting labels on both the upper and lower surfaces of a confectionery bread, respectively, and for enabling a high-speed pasting operation. Let me.

The belt conveying device B has a conveying direction for conveying the commodities from the left side to the right side in the drawing, and the labelers 1a, 1b and 2a, 2b are arranged at a predetermined interval in the conveying direction.
Are arranged, and labelers 1a and 2a are for over-applying a label on which a product name, a price, and the like are printed, and are attached to the labeler 1a.
Reference numerals b and 2b denote pastes for issuing labels on which additives, bar codes, and the like are printed. Reference numeral 3 in the drawing denotes a console including a display unit and an operation unit. The label pasting device A is pasted by the first labelers 1a and 1b and the second labelers 2a and 2b every other confectionery bread conveyed by the belt conveyance device B, and specifically, is applied to an odd-numbered confectionery bread. Labels are affixed by the first labelers 1a and 1b, and the second labeler 2 is attached to even-numbered confectionery breads.
Labels are affixed at a and 2b.

More specifically, the belt conveying apparatus B is constituted by arranging two sets of belt conveyors B1 and B2 in the conveying direction in series in the same conveying direction, each having a driving motor 4, 4 '. And a symmetrical structure in which the driving side and the driven side are arranged opposite to each other. However, since the other components are the same, one belt conveyor B1 will be described for convenience of description, and the other will be denoted by the same reference numeral and description thereof will be omitted.

As shown in FIG. 3, the belt conveyor B1 is divided into three side conveyors b1 and b2 in the width direction.
And a central conveyor b3, b3 '. The central conveyor b3, b3' is divided into two parts in the transport direction in order to form an opening 5 that enables labeling by the labeling device 1b for lower application. is there. Each conveyor b1, b2, b3,
b3 'is an endless flat belt 10b1, 10b2, 10
Using b3, 10b3 ', belt of side conveyor b1, b2
10b1, 10b2, belt 10b of central conveyor b3, b3 '
Flat belt wider than 3,10b3 '. On the drive side of the belt conveyor B1, a drive shaft 12 rotatably supported by a support shaft 11 and rotated by a drive motor 4 is provided. Three drive rollers 13, 14, 15 are mounted on the drive shaft 12. Attach and fix in a skewered shape.

On the other hand, on the driven side of the belt conveyor B1,
Three rollers 16, 17, 18 are inserted in a skewered manner on the support shaft 20, and each is rotatably mounted.
A connecting pipe 19 is inserted and fixed between 16 and 18 for connection. Further, rollers 21 and 22 are rotatably supported at both ends of the opening 5 on the central conveyors b3 and b3 ', respectively.

The side conveyor b1 is formed by winding the belt 10b1 between a driving roller 13 and a roller 16, and the side conveyor b2 is formed by winding the belt 10b2 between a driving roller 14 and a roller 17. It is composed by winding. Similarly, the central conveyor b3 is configured by winding the belt 10b3 between the driving roller 15 and the roller 21, and the central conveyor b3 '
Is constructed by winding the belt 10b3 'between the rollers 18 and 22. The roller 18 located on the driven side of the belt conveyor B1 rotates integrally with the driven roller 16 of the rotating side conveyor b1 and the driving force is transmitted by the joint pipe 19, so that the driving roller of the central conveyor b3 'is driven. Is composed.

The drive rollers 13, 14, 15 and the roller 22
The roller is automatically centered as a so-called crown-type roller, more specifically, a double-inclined or drum-shaped shape in which the diameter in the axial center is maximized and the diameter is gradually reduced toward both ends. That is, each conveyor b1, b2, b3,
When the belts 10b1, 10b2, 10b3 and 10b3 'of b3' are displaced in the axial direction on the side of the drive rollers 13, 14, 15 and the roller 22, the tension changes due to the surface shape of the rollers. Acts in the direction of correction.

On the other hand, the driven rollers 16, 17, 18 and the roller 21 are cylindrical bodies made of synthetic resin, and the centering bearing 30 is interposed inside the central portion in the axial direction, and each roller is horizontally moved. It can be tilted in the direction of conveyance of the conveyor as it is, in other words, it can be swung. The aligning bearing 30 has a structure in which steel balls 33 are arranged between the inner ring 31 and the outer ring 32, and the outer ring 32 can be tilted to some extent freely with respect to the axis of the inner ring 31, that is, the structure has a self-aligning property. . As shown in the enlarged view of FIG. 4, each of the aligning bearings 30 fixes the outer ring 32 to the inner surface of the central portion of the rollers 16, 17, 18 and fixes the inner ring 31 to the support shaft 20. . Although not shown, the roller 21 is also provided with a centering bearing 30 in the same manner. In FIG. 4, reference numeral 34 denotes an apparatus frame, and reference numerals 35, 36, 37, 38, and 39 denote spacers for positioning the rollers 16, 17, and 18.

The operation of the belt conveyor B1 will be described with reference to FIG. 5 on behalf of the side conveyor b1.
If the belt 10b1 has a difference in tension at the left and right side edges due to wear or aging, the belt 16b1
10b1 is displaced to the side where the tension is strong (downward in the figure), but the tension at the side edge is strong, so that the roller 16 uses the above-described centering bearing 30 as a fulcrum to move the deviation side of the belt 10b1 as a driving roller. The axis L is changed within the range of the tilt movable angle α by tilting to move in the 13 directions. The tilt of the roller 13 weakens the tension on the shift side of the belt 10b1.
0b1 moves in a direction to correct the deviation, that is, in a direction to return to the initial set position. By repeating this operation once or several times, the deviation of the belt 10b1 is completely corrected, and the belt 10b1 returns to the initial position. The tilt movable angle α is set to 4 degrees on one side in the embodiment.

The other drive roller 13 is also automatically corrected by the centering action based on the surface shape as described above, even if the belt 10b1 is displaced. Therefore, since the side conveyor b1 has the centering effect of the drive roller 13 in addition to the centering action of the roller 16, the straight traveling property of the belt 10b1 is ensured. Although the description is omitted, the above operation is the same for the other conveyors b2, b3, b3 '.

In the above embodiment, the driven roller 18 of the belt conveyor B1 has a roller structure with an alignment bearing 30, but the roller 18 is a so-called crown type roller and the other roller 22 is adjusted. It is also possible to use a roller with a core bearing, that is, a configuration in which the rollers 18 and 22 are replaced. In addition, since the label pasting apparatus A is a system including the lower labelers 1b and 2b, the central conveyor is divided into two types. However, in the case of only the upper labeler, the central conveyor also has a single belt structure. It is also good. Further, the belt conveyor B1 itself may have a single wide belt structure, and accordingly, one driving roller and one tiltable driven roller may be used.

In the first aspect of the present invention, the drive rollers 13, 14, 15 do not necessarily have to be the so-called crown type shown in the embodiment, but may be an ordinary perfect roller. . In the first aspect, the tiltable roller 16 and the like may have another configuration in place of the support structure using the alignment bearing 30. For example, as shown in FIG.
The support member 41 of the roller 40 is rotatably mounted on the bearing 43 of the frame 42 so as to be tilted, or as shown in FIG. 7, the members 52, 52 'supporting the support shafts 51, 51' of the roller 50.
Guide grooves 53, 5 in the form of arcs centered on the center of the roller 50
3 'is formed, and the roller 50 can be tilted by movably fitting the support shaft 51' along the grooves 53, 53 '. These can be tilted in the horizontal direction about the center of the roller by the difference in the tension on the left and right sides of the roller, similarly to the roller 16 of the present embodiment.

[0019]

According to the present invention, when the belt shifts or meanders during rotation of the belt as a result of wear or aging of the belt material, the rotating (following) roller tilts. Since the angle of the axis is changed, the deviation and the meandering are automatically corrected, and the straight running performance of the belt can be secured. Moreover, the configuration is very simple and can be configured at low cost. According to the second aspect, the alignment bearing is incorporated in the roller, so that the appearance is improved,
Since the tilting fulcrum of the roller is located substantially at the center of the roller in the axial direction, frictional movement at the time of tilting is small and a smooth angle changing operation is performed.

According to the third aspect, since the driving roller also has a correcting function such as meandering, it can be corrected at both ends of the belt in combination with the operation of the rotating (driven) roller. The straight traveling performance of the belt can be ensured, and the drive side roller does not tilt, so that the drive mechanism can be simplified and the structure can be kept simple. Furthermore, according to claim 4, since the straight traveling property of the transport path of the label sticking device is ensured, the positioning between the label sticking device and the product is accurate, and the label sticking position is constant and high accuracy. Can be provided.

[Brief description of the drawings]

FIG. 1 is a front view of a label sticking device in which a belt transport device of the present invention is incorporated.

FIG. 2 is a plan view taken along the line (2)-(2) in FIG.

FIG. 3 is an enlarged plan view of a half of FIG. 2 partially cut away;

FIG. 4 is a sectional view taken along line (4)-(4) in FIG.

FIG. 5 is a plan view illustrating the operation of the present invention.

FIG. 6 is a perspective view showing another embodiment of the present invention.

FIG. 7 is a perspective view showing still another embodiment of the present invention.

[Explanation of symbols]

A: Label sticking device B: Belt conveying device B1, B2: Belt conveyor b1, b2: Side conveyor b3, b3 ': Central conveyor 10b1, 10b2, 10b3, 10b3': Endless belt 13, 14, 15: Drive roller 16, 17, 18: Roller 30: Aligned bearing 31: Inner ring
32: Outer ring 33: Steel ball L: Axis

Claims (4)

[Claims] 1. A belt transport device configured to transport an article on a belt by rotating an endless belt wound between rollers, wherein at least one of the rollers is rotatably supported, and A belt transporting device, wherein the axis of the belt is tiltably supported in a plane parallel to the transport surface. 2. The belt conveying device according to claim 1, wherein the roller is tiltable by providing an alignment bearing inside a substantially central portion in the axial direction. 3. The belt conveying device according to claim 1, wherein the other roller has an inclined shape having a maximum diameter at a central portion in an axial direction and a small diameter at both ends. 4. The belt conveying device according to claim 1, wherein the endless belt forms a conveying path of a label sticking device.