JP2007050953A - Belt conveyor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conveyor which consistently conveys commodities by the same conveyor irrespective of the mode of the commodities to be conveyed. <P>SOLUTION: In the belt conveyor, a trough 7 is arranged between tail rollers 2, 2' arranged on both sides in the longitudinal direction of a frame, and endless conveying belts 3, 3' are wound around the tail rollers so as to house the trough. A recess 24 is formed along the longitudinal direction substantially at a center of the width direction in the trough 7. There is provided a promotion means which promotes deflection of the conveying belt to the recess side when a load is applied to the conveying belt so that the conveying belt is deflected in the recess in a case where commodities are cylindrical or spherical. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a belt conveyor that conveys merchandise, and more particularly, to a belt conveyor that is used when a price operation such as labeling is performed on merchandise in a backyard such as a supermarket.

When a label is attached to a product in a backyard of a supermarket or the like, the product is conveyed by a belt conveyor or the like, and a label on which a price or the like is printed is attached by a label applicator during the conveyance.
By the way, as for the conveyor which conveys goods, for example, the conveyor which conveys cylindrical goods, such as ham and sausage, and spherical goods, such as Saijo, uses the conveyor with a flat conveyance surface, the goods roll on a belt. The conveyance becomes unstable, and it is difficult to apply a label to a product being conveyed by a labeling machine. Therefore, when a cylindrical or spherical product is transported, it is necessary to transport the product with a special conveyor having a substantially V-shaped transport surface (for example, see Patent Document 1).

  On the other hand, when a product stored in a tray with a flat bottom surface or a product packed in a box is transported, the transport state of the product is not constant depending on the position on which the product is placed in the conveyor having a substantially V-shaped transport surface. , Transported in an unstable state. Therefore, when a product having a flat bottom surface is transported, it is necessary to use a conveyor having a flat transport surface.

  Therefore, conventionally, different types of conveyors, such as a V-shaped conveyor and a flat conveyor, are required depending on the goods to be transported, so it is necessary to provide a space for installing each conveyor and to prepare each conveyor. Therefore, there was a problem that the equipment cost increased.

JP-A-9-85115

  The present invention has been made in view of the above-described problems of the prior art, and the problem is that the conveyor can stably transport products on the same conveyor regardless of the form of the products to be transported. Is to provide.

In order to solve the above-described problems, the belt conveyor of the present invention has troughs arranged between tail rollers arranged on both sides of the frame in the machine length direction, and an endless conveying belt spans the tail rollers so as to enclose the troughs. In the wound belt conveyor, a concave portion is formed along the longitudinal direction at a substantially central portion in the width direction of the trough, and when a predetermined load is applied to the conveying belt, the conveying belt moves toward the concave portion. A bending promoting means for promoting bending is provided (claim 1).
The trough may be configured to be the same body as a pair of front and rear frames that are opposed to each other with a predetermined interval, or may be configured to bridge between the frames.
In addition, the shape of the concave portion formed in the central portion in the width direction of the trough may be any shape such as a V shape or an arc shape. In short, a cylindrical or spherical product is placed on the conveying belt on the upper side of the trough. In this case, it is only necessary that the conveying surface (outward path side) of the conveying belt bends along the shape of the recess and can stably convey the product.
Further, an endless conveyor belt wound around the tail roller is wound in parallel between a single belt or a plurality of belts of a predetermined width between the front and rear frames (in a direction perpendicular to the conveyance direction). It can be turned.
Further, as a driving method of the conveying belt, any method such as a center drive method that is generally employed today with a drive mechanism integrally attached, a head drive method, or a method in which the drive mechanism is separated may be used.
As the bending promoting means, a method is adopted in which the outer shape of the shaft portion of the tail roller that supports the conveying belt is a tapered shaft portion that matches the concave shape of the trough (Claim 2), a plurality of conveying belts, for example, two to three A method comprising a book, a method of making a slit in the central portion in the width direction of one belt to make it easy to bend (easy to break), and further forming a conveyor belt with a material that easily stretches, etc. Any of them may be used in combination.

  According to the above means, the transport surface (outward path side) of the transport belt wound around the tail rollers on both sides is rotated while maintaining a flat state, like a normal conveyor having a flat trough surface. When a spherical or cylindrical product is placed on this conveyor belt, the conveyor surface (outward path side) of the conveyor belt bends downward by the action of the deflection promoting means, and the product is supported by the trough recesses. It is conveyed by the conveyor belt in the posture. When a product such as a tray with a flat bottom surface is placed, the tray has a larger bottom area than, for example, a cylindrical product. It is supported at a position away from the outside. As a result, the conveyor belt is less bent, and the product can be stably conveyed in a state that is almost the same as that of a normal conveyor having a flat trough surface.

Then, both sides of the trough in the width direction are formed on a flat surface substantially flush with an upper edge of both sides of the recess in the width direction, and the deflection promoting means corresponds to the flat portion of the trough in the tail roller. Two conveyor belts are wound in parallel across both tail rollers, with the taper shaft portion whose diameter becomes smaller toward the center of the shaft except for the straight shaft portion and the center in the width direction of the recess. It is good also as a structure which turned (claim 3).
In that case, the minimum diameter portion of the tapered shaft portion of the tail roller is made substantially the same as the lowest portion of the concave portion of the trough.

  According to the above means, the two conveyor belts are wound in parallel around the central portion in the width direction of the trough, and the tail rollers on both sides supporting the conveyor belt are centered from both sides to the center. The belt is easy to bend at the inner edge of the conveyor belt located near the center in the width direction of the trough, and the spherical or cylindrical product is deformed by the deflection of the inner edges of both belts. It can be held securely and transported reliably. Moreover, since flat surfaces are formed on both sides in the width direction of the trough, even a product (tray) having a flat bottom can be stably conveyed.

Further, a rib fitting groove is formed on the outer peripheral surface of the straight shaft portion of the tail roller, and on the other hand, a meandering prevention rib is fixed to a position corresponding to the fitting groove on the inner side surface of the conveying belt. May be fitted into the rib fitting groove (claim 4).
According to this means, the meandering prevention rib of the conveying belt is fitted into the rib fitting groove formed in the straight shaft portion having a uniform shaft diameter, whereby the meandering of the conveying belt is prevented and stable rotation is achieved. Is secured.

  And when the shape of the concave part of the said trough is made into the substantially V-shaped cross section (Claim 5), the spherical or cylindrical outer periphery can be supported by the inclined straight surfaces on both sides constituting the V-shape. As a result, the product can be stably supported and can be stably conveyed.

Further, a label sticking device may be provided above the conveying surface of the conveying belt. In this case, since even a spherical or cylindrical product can be stably conveyed, labeling on the product can be performed stably and reliably.
Furthermore, the belt conveyor includes a conveyor unit in which a trough is disposed between tail rollers and a conveyor belt is wound thereon, and a driving unit that detachably mounts the conveyor unit and drives and rotates one tail roller of the conveyor unit. It is also possible to adopt a separation type comprising a frame portion.
In that case, the conveyor belt can be easily replaced and cleaned.

According to the belt conveyor of the present invention, if the product is spherical or cylindrical, the conveyor belt is bent and supported in the recess of the trough, so that the product can be stably conveyed. Also, a product with a flat bottom surface has a larger bottom area than, for example, a cylindrical product, so there is less deflection of the conveyor belt, and therefore the product is transported in the same way as a normal belt conveyor with a flat trough surface. be able to. Therefore, regardless of the form of the product, the product can be conveyed by the same belt conveyor.
When the means for accelerating the bending is set forth in claim 2, the conveying belt wound around both tail rollers bends smoothly within the range of the taper shaft portion, thereby stabilizing the spherical or cylindrical product. Can be supported and transported well.
According to the third aspect, the inner edges of the two conveyor belts are easily bent, and the inner and outer edges of both belts can stably and securely hold a spherical or cylindrical product. it can. Moreover, since flat surfaces are formed on both sides in the width direction of the trough, even a product (tray) having a flat bottom portion can be stably conveyed.

Furthermore, the meandering of the conveying belt is prevented by fitting the meandering prevention ribs of the conveying belt into the rib fitting grooves formed in the straight shaft portion having a uniform diameter of the axial portion. Stable rotation is ensured.
Further, with the configuration according to the fifth aspect, the spherical or cylindrical outer periphery can be supported at two points by the inclined linear surfaces on both sides constituting the V-shaped recess. As a result, the product can be stably supported and can be stably conveyed.
And when it is set as the structure of Claim 6, since it can convey stably even if it is a spherical or cylindrical goods, the label sticking to this goods can also be performed stably and reliably.
Furthermore, in the case of the configuration described in claim 7, the conveyance belt can be easily replaced, cleaned, and the like.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The illustrated belt conveyor includes two endless conveying belts, which are wound in parallel across two tail rollers installed at a predetermined interval in the machine length direction, while maintaining a constant tension, It comprises a frame part that detachably mounts the conveyor part, and the frame part is provided with driving means for driving the conveyor belt of the conveyor part, and the conveyor part resists the urging force of the conveyor length on one side in the machine length direction. And a movable portion that can be shrunk to reduce the tension acting on the conveyor belt.

  1 and FIG. 2 are belt conveyors each having a single long conveyor section mounted on a frame section, A is a conveyor section in which two endless conveyor belts are wound in parallel, and B is the conveyor. This is a frame part provided with driving means for driving and rotating the conveyor belt of part A. The conveyor part A is detachably mounted on the frame part B, and a label is attached above the conveyor surface of the conveyor part A. Device C is arranged.

The conveyor section A includes a frame body 1 that is configured such that the length of the conveyor (the distance between the left and right rollers that support and support the endless belt) can be adjusted, and a tail roller that is horizontally supported on both sides of the frame body 1 in the longitudinal direction. 2 and 2 ′, an endless conveying belt 3 and 3 ′ wound around a pair of left and right tail rollers 2 and 2 ′, and one tail roller 2 installed on the frame body 1 (on the left side in the drawing) A rotation transmission belt (timing belt) 4 for applying a rotational force to the roller is provided.
The two conveying belts 3 and 3 ′ correspond to a bending promoting means. The conveyor belts 3 and 3 'are not limited to a completely separated form as shown in the figure. For example, a slit is formed at the center in the width direction of one belt, and the belt is bent at an appropriate interval in the circumferential direction. It may be in a simplified form.

The frame 1 is composed of a fixed frame 5 having a length shorter than the conveyor length in use, and a movable portion 6 continuously provided on one side in the longitudinal direction of the fixed frame 5 so as to be slidable along the longitudinal direction. The tail roller 2 is rotatably mounted on the end of the fixed frame 5 opposite to the side on which the movable portion 6 is connected, and the tail roller 2 ′ is rotatably mounted on the side end of the movable portion 6. ing.
The fixed frame 5 has a pair of front and rear frame plates 5 'formed by bending a horizontal plate portion 5b at a substantially right angle at the upper edge of the side plate portion 5a so as to face each other at a predetermined interval, and between the horizontal plate portions 5b. A trough 7 having a substantially V-shaped cross section is disposed, and the front and rear side plate portions 5 a and the trough 7 are connected by a connecting rod 8.
Between the inner edge of the horizontal plate portion 5b of the pair of front and rear frame plates 5 'and the outer edge in the width direction of the trough 7, a conveyor belt 3 wound around the left and right tail rollers 2, 2'. Clearances 9 and 9 ′ are formed in which the ribs 3a provided at the center of the back side of 3 ′ are fitted, thereby preventing meandering travel of the conveyor belts 3 and 3 ′. Further, rib fitting grooves 23 into which the ribs 3a of the conveying belts 3 and 3 'are fitted are recessed in the outer peripheral surfaces of the tail rollers 2 and 2' at positions corresponding to the gaps 9 and 9 '. As a result, the meandering travel of the conveyor belts 3 and 3 ′ can be prevented.

The movable portion 6 is configured by arranging a pair of front and rear side plates 6a in parallel at intervals that can be fitted between the front and rear side plate portions 5a in the fixed frame 5 and integrally connecting them with a connecting rod 10. The side of the movable portion 6 opposite to the side on which the tail roller 2 ′ is installed is connected to the side plate portion 5 a of the fixed frame 5 so as to be slidable to the left and right.
The sliding structure of the movable part 6 with respect to the fixed frame 5 is formed such that the long hole part 11 is opposed to the side plate part 5a before and after the fixed frame 5, and the side plate 6a of the movable part 6 is fitted in the long hole part 11. Matching guide pins 12 and latching rods 13 are attached at intervals. In addition, although the guide pin 12 is constituted by a single piece in which the front and rear sides are independent and the latch rod 13 is constructed over the side plates on the front and rear sides, it is arbitrary that both of them are in a separate form or a single piece. .
Further, the opening length of the long hole portion 11 is such that the conveyor belt is shortened by moving the movable portion 6 and the conveyor belts 3 and 3 ′ wound around the left and right tail rollers 2 and 2 ′ are slack. The length is such that the conveyor belts 3 and 3 ′ can be easily removed.

  Then, the bracket 14 is fixed to a position closer to the center of the conveyor length than the long hole portion 11 in the side plate portion 5a of the fixed frame 5, and the guide plate 15 is movably inserted into the through hole of the bracket 14, and the guide One side of the plate 15 is connected to the guide pin 12 of the movable part 6, and the other side is connected to a separating means described later. A coil spring 16 is elastically mounted between the bracket 14 and a spring receiver fixed in the vicinity of the guide pin 12 in the guide plate 15. Thereby, the guide pin 12 and the latching rod 13 of the movable part 6 are pushed toward the side end side (right direction in the drawing) of the fixed frame 5 by the elastic force of the coil spring 16. The conveyor part A is established to a predetermined conveyor length. Therefore, if the movable part 6 is pushed against the elastic force of the coil spring 16, the guide pin 12 and the latching rod 13 move in the elongated hole part 11 toward the center of the fixed frame 5, The conveyor length is shortened.

The fixing means for fixing the movement of the movable portion 6 at a predetermined movement position (shortened position) includes a concave portion 17 that is formed to communicate substantially downward at a right angle from a middle position in the length direction of the long hole portion 11, and the movable portion. It is comprised with the latching rod 13 constructed in the part 6, and the movement fixation of the movable part 6 is hold | maintained because the latching rod 13 engages and engages with the recessed part 17. FIG.
The formation position of the concave portion 17 connected to the long hole portion 11 is such that when the movable portion 6 is pushed toward the inner end of the long hole portion 11 and the guide pin 12 is positioned in the vicinity of the inner end of the long hole portion 11, The movable portion 6 rotates downward about the guide pin 12 and is set to a position where the latch rod 13 is fitted.

  Further, the front and rear side plate portions 5a constituting the fixed frame 5 are engaging holes 19, 19 'that can be fitted from above to support rods 18, 18' provided at two locations in the longitudinal direction of the frame portion B. Is formed in the notch, and by engaging and engaging the engagement holes 19 and 19 'with the support rods 18 and 18', the conveyor part A can be mounted and fixed on the frame part B. When mounted and fixed on the frame part B, the power of the driving means mounted on the frame part B is transmitted to the conveyor part A.

That is, the conveyor belts 3 and 3 ′ wound around the tail roller 2 of the fixed frame 5 and the tail roller 2 ′ of the movable portion 6 are rotated by the drive rotation of the tail roller 2. A rotation transmission belt (timing belt) 4 that transmits the rotational force of the driving means provided on the part B side is disposed between the tail roller 2 and the side plate part 5 a of the fixed frame 5.
The rotation transmission belt 4 is a timing belt with double-sided teeth, and is supported by a toothed pulley 20 fixed on the shaft of the tail roller 2 and a predetermined distance from the position of the toothed pulley 20 toward the center of the conveyor length. It is wound around the toothed pulleys 21 and 21 '. When the conveyor part A is mounted and fixed on the frame part B, the outer peripheral surface of the rotation transmission belt 4 between the toothed pulley 20 and the toothed pulley 21 'is the toothed transmission pulley 22b of the driving means 22 on the frame part B side. The rotation transmission belt 4 is rotated by the rotational force of the toothed transmission pulley 22b.

  The trough 7 disposed between the front and rear side plate portions 5a of the fixed frame 5 of the conveyor portion A has a length that can be disposed between the tail rollers 2 and 2 'using a metal strip, and its longitudinal direction (longitudinal direction). ) A concave portion 24 having a substantially V-shaped cross-section with the central portion in the width direction being the lowest portion is bent and formed over the entire length. Further, both side edges in the width direction are provided with rigidity so as to be bent downward to prevent torsional deformation and the like. The apex of the substantially V-shaped cross section is substantially flush with the surface of the horizontal plate portion 5b of the side plate portion 5a sandwiching the trough 7, and the two conveyances wound around the tail rollers 2, 2 '. The belts 3 and 3 ′ are configured to horizontally support the conveyance surface (forward path surface) side. In addition, connection integration of the trough 7 and the side plate part 5a sandwiching the trough 7 may be performed by fixing the connection plates 8 ′ to both side ends in the longitudinal direction of the trough 7 in addition to the connection rod 8 as described above. .

  The shape of the recess 24 is not limited to the V shape shown in the figure, and may be any shape such as a U-shaped, V-shaped, or U-shaped groove having a rectangular cross-section formed continuously. In short, any shape that can stably convey cylindrical or spherical products without rolling them in the width direction of the conveyor belts 3 and 3 ′ may be used. That is, a cylindrical or spherical product is stably supported by the recess 24 of the trough 7 via the conveyor belts 3 and 3 '.

  In accordance with the shape of the recess 24 of the trough 7, the outer shape of the shaft portion of the tail roller 2, 2 'around which the conveyor belts 3, 3' are wound is also formed in the same shape. That is, the tail roller is provided with a deflection promoting means. For example, when the concave portion 24 is V-shaped, the shaft portions of the tail rollers 2 and 2 ′ also have a straight shaft portion 2 a on both sides of the shaft length and a gradually decreasing diameter toward the center portion between the straight shaft portions 2 a. The taper shaft portion 2b is formed, and the taper angle is adjusted to the inclination angle of the recess 24 of the trough 7. Thus, when the product W is transferred from the belt conveyor to the downstream conveyor, the product W is stably conveyed, and the transfer is performed smoothly.

The frame part B that horizontally supports the conveyor part A configured as described above includes a mounting frame 25 that supports and holds the conveyor part A, a leg body 26 that supports the mounting frame 25 at a predetermined height, It comprises drive means 22 for driving and rotating one tail roller 2 of the conveyor section A.
The loading frame 25 has a pair of front and rear side frames 25a having substantially the same height as the conveyor portion A, arranged in parallel and facing each other at a predetermined interval, and the both side frames 25a being spaced apart in the longitudinal direction. The two places are connected by a connecting rod 25b. Further, support rods 18 and 18 ′ for defining the mounting position of the conveyor part A are provided horizontally and projecting inward on the inner surfaces of the pair of front and rear side frames 25 a.

  The driving means 22 includes a motor 22a, a toothed transmission pulley 22b, and a transmission band 22c such as a chain or a belt for transmitting the output of the motor 22a to the toothed transmission pulley 22b. The outer diameter of the toothed transmission pulley 22b. Is formed in a large diameter so that the contact range with the rotation transmission belt 4 is widened.

The belt conveyor configured as described above includes the toothed transmission pulley 22b of the driving means 22 and the rotation transmission belt of the conveyor section A which are mounted on the frame section B side by mounting and fixing the conveyor section A on the frame section B. 4, the rotation transmission belt 4 is rotated by the rotation of the toothed transmission pulley 22b, and the tail roller 2 is driven to rotate, whereby the conveyance belt 3 wound around the tail rollers 2 and 2 '. , 3 ′ are rotated (see FIG. 3).
When separating and removing the conveyor part A from the frame part B, as shown in FIG. 4, the movable part 6 supporting the tail roller 2 ′ is moved toward the fixed frame 5 against the elastic force of the coil spring 16. When pushed, the guide pin 12 and the latching rod 13 of the movable part 6 move in the elongated hole part 11 of the fixed frame 5 toward the center of the conveyor length, the conveyor length becomes shorter, and the tail roller 2 and tail The interval between the rollers 2 ′ is narrowed, the tension acting on the conveyor belts 3 and 3 ′ is weakened, and the guide plate 15 is slid by the pushing of the movable part 6 and is engaged with the support rod 18 ′ of the frame part B. The conveyor part A is separable. As a result, the conveyor part A pivots upward about the support rod 18 of the frame part B, so that the engagement hole 19 ′ of the fixed frame 5 is disengaged from the support rod 18 ′, and the other engagement hole 19 is supported. The hook 18 is disengaged by moving the conveyor portion A (frame 1) along the engagement hole 19 (see FIG. 5).
Further, when removing the conveyor belts 3 and 3 'in the conveyor part A removed from the frame part B, the movable part 6 is engaged at a position before the dead end of the pushing of the movable part 6 to fix the movement, The distance between the tail rollers 2 and 2 'can be made narrower than that in use, and the conveyor belts 3 and 3' can be easily removed.

Next, the conveyance of the product by the above-described belt conveyor will be described. When the product W is housed in a tray having a flat bottom surface, the bottom area of the product W is a cylindrical product W ′ (see FIG. 7). Since it is larger in comparison, the conveyor belts 3 and 3 ′ are less bent and can be conveyed in a substantially horizontal state as in the case of a normal belt conveyor having a flat surface of the trough 7 (see FIG. 6).
However, in the case of the cylindrical product W ′, the two conveying belts 3 and 3 ′ wound around the tail rollers 2 and 2 ′ have an inner edge approximately in the width direction of the recess 24 of the trough 7. Since it is located near the center, the inner edges of the conveyor belts 3 and 3 ′ are bent downward by contact with the product W ′, and the product W ′ is supported by the recess 24. Thereby, the product W ′ is stably supported by the bending of the conveyor belts 3 and 3 ′ and is reliably conveyed (see FIGS. 7 and 8).

The above-described embodiment is an example in which the two conveyor belts 3 and 3 ′ are wound around the tail rollers 2 and 2 ′. However, as shown in FIG. The conveyor belt 27 may be used. In this case, when the product is cylindrical or spherical, it is necessary to bend along the shape of the recess as described above, and therefore, a material that can be easily bent is selected. In addition to the material, for example, a slit that does not separate the belt along the center line in the width direction of the belt may be provided.
Further, when a single conveyance belt 27 is used, when a cylindrical or spherical product W ′ is conveyed, the belt 27 is bent and deformed by the above-described configuration, but the belt 27 moves in the center in the width direction due to the deformation. Therefore, the meandering prevention of the conveying belt 27 is performed by providing meandering preventing guides 28 and 28 'for restricting the movement of the conveying belt 27 in the width direction on the upper surface of the side plate portion as shown in FIG. Also good.

  In the embodiment shown above, the horizontal plate portions 5b integrated with the side plate portions 5a are disposed on both sides of the trough 7 in the width direction. However, the horizontal plate portions 5b are not provided, and the trough recesses 24 'are formed on the side plate portions. (See FIG. 9B). In that case, the widthwise end edges of the trough may be connected and fixed to the front and rear side plates. Further, when the shape of the trough recess 24 'is changed, the shape of the tail rollers 2, 2' is also changed accordingly.

  Although the above-described embodiment has been described with respect to the separation type in which the driving means is separated from the conveyor section, the present invention may be a general belt conveyor in which the driving means is integrally provided in the conveyor section.

The front view which shows one Example of the belt conveyor which concerns on this invention. The enlarged plan view which cuts and shows a part. The same front view which shows the drive structure of a conveyance belt. The elements on larger scale which show the state which shortened the captain of the conveyor part. The same front view which shows the state which isolate | separated the conveyor part from the frame part. FIG. 3 is a partially cutaway enlarged side view taken along line (6)-(6) in FIG. 2. The longitudinal cross-sectional view which follows the (7)-(7) line | wire of FIG. The perspective view which shows the state which conveys cylindrical goods. (A) is sectional drawing which shows the other example of the meander prevention means of a conveyance belt, (b) is sectional drawing which shows the modification of the recessed part shape of a trough.

Explanation of symbols

A ... Conveyor part B ... Frame part
C: Label attaching device 2, 2 '... Tail roller 2a ... Straight shaft portion 2b ... Tapered shaft portion 3, 3' ... Conveying belt 3a ... Meandering prevention rib
7 ... Trough 23 ... Rib fitting groove 24 ... Recess

Claims (7)

In a belt conveyor in which troughs are arranged between tail rollers arranged on both sides in the machine length direction of the frame, and an endless conveying belt is wound around the tail rollers so as to contain the troughs.
A trough is formed in the trough substantially in the center in the width direction along the machine length direction, and further, when a predetermined load is applied to the transport belt, the transport belt bends toward the recess. A belt conveyor comprising means.   The belt conveyor according to claim 1, wherein the deflection promoting means is formed with a tapered shaft portion that matches the concave shape of the trough on the outer shape of the shaft portion of the tail roller.   Both sides in the width direction of the trough are formed on a flat surface that is substantially flush with the upper edges of both sides in the width direction of the recess, and the deflection promoting means is a straight shaft corresponding to the flat portion of the trough in the tail roller. Two conveyor belts are wound in parallel across both tail rollers, with the taper shaft portion whose inner portion excluding the portion being tapered toward the center of the shaft and the center in the width direction of the recess. The belt conveyor according to claim 1, wherein:   A rib fitting groove is formed on the outer peripheral surface of the straight shaft portion of the tail roller, and meandering prevention ribs are fixed to the inner surface of the conveying belt at a position corresponding to the fitting groove. The belt conveyor according to any one of claims 1 to 3.   The belt conveyor according to any one of claims 1 to 4, wherein a shape of the trough recess is substantially V-shaped in cross section.   The belt conveyor according to any one of claims 1 to 5, wherein a label sticking device is provided above the conveyance surface of the conveyance belt.   The belt conveyor includes a conveyor unit in which a trough is disposed between tail rollers and a conveyor belt is wound thereon, and a driving unit that detachably mounts the conveyor unit and drives and rotates one tail roller of the conveyor unit. The belt conveyor according to any one of claims 1 to 6, comprising a frame portion.

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