JP2000177836A - Work piece transferring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely keep a conveyed work piece from falling down or being caught at the transferring part of a belt conveyer, to simplify the structure of a work piece transferring device and to apply it to two-way conveyance. SOLUTION: A rotatable cylindrical auxiliary roller 4 is arranged between end parts of adjacent belt conveyers 1 continuously formed in a conveying direction so as to set the height of its upper surface nearly equal to that of the upper surfaces of the belts on both its sides, multiple lines of parallel projections extending in its widthwise direction are formed on the surface of the auxiliary roller, or its coefficient of friction is increased so as to prevent the falling down of a work piece, and thereby, the fallen-down work piece is raised and sent in the traveling direction. It is preferable that a driving source is provided for the auxiliary roller so that the auxiliary roller can be driven synchronously with the belt conveyers on the upstream side and the downstream side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work transfer device for smoothly transferring a work such as a conveyed product or a semi-finished product to a downstream conveyor at a transfer portion of a belt conveyor.

[0002]

2. Description of the Related Art In a conveyor system in which a plurality of belt conveyors are connected to convey a workpiece, arcs at both ends of an upstream conveyor and a downstream conveyor are joined at a connecting portion of the belt conveyor to form a wedge-shaped gap. You. When a heavy object with a deviated center of gravity or a work having a protrusion on the transfer surface side is conveyed by such a conveyor system, the work falls into a wedge-shaped gap at a connecting portion of the belt conveyor and becomes in a biting state. The flow of the work may be stagnated. When a workpiece falls into the transfer section of the belt conveyor, it is necessary to stop the conveyor and lift and reposition the bitten workpiece. It is a big problem.

[0003] As a method of preventing such work biting, for example, there is a method of using a dedicated work transfer lift or a method of transferring by a slide plate, but the equipment becomes complicated and expensive, and the burden of maintenance is reduced. It is not preferable because it becomes large. An easier way to deal with this is
As shown in FIG. 6 (a), a connecting method in which a step is provided between the upstream conveyor 1a and the downstream conveyor 1b may be adopted. However, in such a connection method, when the work 2 is heavy, the downstream belt 3b is greatly worn by the impact of the fall of the work. Further, when the belt conveyor is to be used for conveyance in both the forward and reverse directions, means for changing the height of both side belts at the connecting portion is required, and the transfer device is undesirably large and complicated.

As shown in FIG. 6 (b), a connecting method in which a rotatable cylindrical auxiliary roller 4 is disposed in a gap between the ends of the conveyors 1a and 1b has been considered. This method has the advantage that the device structure is relatively simple and requires little maintenance. However, even with this method, in the case of a work in which the position of the center of gravity is largely deviated or a work in which the lower surface has irregularities and the fulcrums are dispersed back and forth, the work 2 is located between the upstream conveyor 1a and the auxiliary roller 4. In some cases, the leading end is dropped and bitten, and it is necessary to prevent biting more reliably.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention is an improvement of the conventional work transfer device, which can be applied to a work having a large center of gravity or a work having an uneven bottom surface regardless of the shape and weight of the work. It is an object of the present invention to provide a work transfer device which can surely prevent dropping and biting, has a relatively simple structure, and can be applied to bidirectional conveyance.

[0006]

In order to solve the above-mentioned problems, a work transfer device according to the present invention comprises a rotatable cylindrical auxiliary roller between adjacent ends of a belt conveyor connected in a conveying direction. A workpiece transfer device having its upper surface arranged at substantially the same height as the upper surface of both belts, wherein a plurality of parallel projections extending in the width direction are provided on the surface of the auxiliary roller. . The parallel projection may be formed integrally with the auxiliary roller, or may be a rod-shaped projection member joined or engaged with the auxiliary roller surface. Further, the projection member may be exchangeably attached to the surface of the auxiliary roller to form a parallel projection. As described above, by providing the parallel protrusions on the surface of the auxiliary roller, it is possible to transfer the propulsive force of the work to the auxiliary roller without loss and transfer the work. Further, even if a slip occurs on the contact surface between the work and the auxiliary roller, the side of the parallel projection abuts on the tip end surface or the bottom surface of the work, so that the work can be prevented from dropping.

In a second work transfer apparatus according to the present invention, a rotatable auxiliary roller is provided between adjacent ends of a belt conveyor connected continuously in the transport direction so that the upper surface thereof is substantially at the same height as the upper surfaces of both belts. Are arranged so that
The surface of the auxiliary roller is formed of a material having a large friction coefficient, or the surface of the auxiliary roller is subjected to a surface roughening treatment or a roughening process to increase the friction coefficient of the surface. It is characterized by doing so. In this way, when the workpiece conveyed by increasing the static friction coefficient of the contact surface between the workpiece and the auxiliary roller hits, the workpiece rotates in the advancing direction, and slips on the contact surface to move the workpiece between the auxiliary roller and the upstream belt. The work can be fed in the traveling direction by reliably preventing the work from dropping.

The auxiliary roller of the work transfer device may have a drive source for rotating the auxiliary roller, and may be driven synchronously with the upstream and downstream conveyors.
Further, in such a synchronous driving, the auxiliary roller may be driven from a driving source of the belt conveyor via a driving force transmitting means. In this way, by arranging the driving source on the auxiliary roller and driving it synchronously with the conveyors on both sides, it is possible to more reliably prevent the work from dropping. In addition, depending on the shape of the work, the work may fall down. However, since the fallen work is lifted and moved smoothly by driving the auxiliary roller, the labor of the operator can be saved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A work transfer device according to the present invention will be described in detail below based on embodiments.

[0010]

Embodiment 1 FIG. 1 is a perspective view of a work transfer device according to one embodiment of the present invention. Upstream conveyor 1a and downstream conveyor 1b of belt conveyors connected in the conveying direction
A rotatable auxiliary roller 4 is disposed in a gap between the ends of the auxiliary roller 4. Both ends of the auxiliary roller 4 are supported by bearings 5a and 5b, and are driven by the work 2 to rotate freely. The upper surface of the auxiliary roller 4 includes an upstream belt 3a and a downstream belt 3b.
The height is set to be substantially the same as the upper surface, but there may be some steps.

The auxiliary roller 4 has only to be installed at least in a range where the work 2 passes, and its width may be equal to or shorter than the width of the belt. Although the diameter is not particularly limited, it is, for example, about １ ／ or less of the diameter of the arc at the end of the belt. A plurality of parallel projections 6 extending in the width direction are provided on the surface of the roller 4 to prevent the workpiece 2 from dropping.

FIG. 2 is a cross-sectional view and a side view showing an example of the shape and mounting structure of the parallel projection of the auxiliary roller in the present invention. In the example of FIG. 2 (a), round rod-shaped projection members 7 are welded to the surface of the cylindrical auxiliary roller 4 at regular intervals in the circumferential direction in parallel with the width direction (axial direction), and four rows of parallel projections are provided. Is formed. In the example of FIG. 2B, the protruding member 6 having a rectangular cross section is welded to the chamfered surface of the auxiliary roller 4 in the same manner as described above. The method of forming parallel projections by such welding is characterized in that its construction is simple.

In the example of FIG. 2C, the cross-sectional shape of the projection member 6 is the same as that of FIG. 2B, but is characterized in that it is attached to the auxiliary roller 4 in a replaceable manner. The projecting member 6 is engaged with the chamfered surface of the auxiliary roller 4 by screws 7 arranged at predetermined intervals in the longitudinal direction,
It can be easily replaced as needed. By making the projection member replaceable in this way, when the projection member is worn out, it can be replaced with a new projection member, and the life of the auxiliary roller can be extended. Further, when the shape or the like of the work to be conveyed changes, it can be easily replaced with a projection member having a shape suitable for this. In addition, the method of attaching the protrusion member interchangeably is not limited to the above example.

In the example shown in FIG. 2D, the parallel projections 8 are formed by cutting the auxiliary roller 4 itself. That is, cutouts are provided at equal intervals in parallel to the axial direction of the auxiliary roller 4,
The remaining part is a parallel projection 8. The shape of the auxiliary roller before processing may be a prism or a cylinder. Further, the shape of the bottom surface 9 of the notch does not need to be cylindrical, but may be any shape. The method of forming the parallel projections by cutting as described above is characterized in that the strength of the parallel projections is large and the cross-sectional shape can be freely selected.

FIG. 3 is a perspective view showing another embodiment of the work transfer device of the present embodiment. In this embodiment, the auxiliary roller 4 is provided with a rotation drive mechanism 10, and in addition to the configuration of FIG.
A rotation drive mechanism 10 including a control device 2 and a control device 13 is provided. The auxiliary roller 4 is driven synchronously with the upstream conveyor and the downstream conveyor by the motor 11 whose speed is controlled by the control device 13. That is, the driving is performed so that the traveling speed of the upstream and downstream belts 3a and 3b and the peripheral speed of the auxiliary roller 4 substantially match.

The control device 13 sets a constant speed value, and sets the auxiliary roller 4, the upstream belt 3a, the downstream belt 3
b, or a form in which only the speed of the auxiliary roller 4 is controlled in response to a speed signal of one or both of the belts 3a and 3b controlled by another driving device. Good. The auxiliary roller motor 11 may be of a variable speed by itself or may be of a variable speed by a transmission or the like.

The driving force transmission mechanism 12 may be, for example, any of a combination of a sprocket and a chain, a combination of a pulley and a V-belt, and a combination of gears. If a motor capable of rotating forward and reverse is used for the auxiliary roller motor 11, FIG.
Can be applied to the reciprocating transfer as it is.

When the auxiliary rollers are synchronously driven as described above, the driving force is transmitted from the upstream belt 3a, the downstream belt 3b, or a driving source that drives both of them without disposing a dedicated driving source. It may be driven via means. In this case, the driving force transmitting means only needs to have a shifting function such that the traveling speed of the belts 3a and 3b and the peripheral speed of the auxiliary roller 4 match, and may be used by appropriately combining ordinary driving force transmitting means. . By adopting such a configuration, the control system device can be omitted or simplified, and the transfer direction of the work can be automatically switched, so that the facility can be further simplified.

Next, the operation of the parallel projection in the present invention will be described. FIG. 4 is a schematic diagram for explaining the operation of the parallel projection. FIG. 4A shows a case where the auxiliary roller is free to rotate.
(b) shows a case where this is driven by a driving source. In the case of FIG. 4A in which the auxiliary roller rotates freely, the work 2 usually rides on the auxiliary roller 4 and the bottom surface of the work rotates the auxiliary roller 4 or the tip surface of the work 2 pushes the side surface of the parallel projection 6. The auxiliary roller 4 is rotated.

If the center of gravity G of the workpiece 2 does not reach the auxiliary roller 4 or the downstream belt even if the center of gravity G of the workpiece 2 has passed the vertex Q of the arc at the end of the upstream belt 3a, the workpiece 2 is inclined forward and P At this point, it contacts the auxiliary roller 4. At this time,
The gravity W of the work 2 acting on the contact point P may cause the auxiliary roller 4 to rotate in the reverse direction or cause slip on the contact surface. However, since the side surface of the parallel protrusion 6 abuts against the front end surface of the work 2, reverse rotation or slip is prevented, and the auxiliary roller 4 rotates forward as the work 2 is extruded. It is transferred to the next belt conveyor.

On the other hand, FIG.
In the case of (b), even if the work 2 leans forward and leans on the auxiliary roller 4, the bottom surface of the work 2 is lifted by the side surface of the parallel projection 6, and slip on the contact surface is prevented. In this way, if the auxiliary roller is provided with a drive source and is driven synchronously with the upstream and downstream conveyors, it is possible to more reliably prevent the work from dropping. Also,
When the center of gravity of the work is significantly deviated, or when the fulcrum is dispersed due to unevenness on the lower surface of the work, it may be inevitable that the work falls, but by driving the auxiliary roller, The tip of the depressed work can be lifted and smoothly transferred.

Regardless of whether the auxiliary roller rotates freely or is driven by a drive source, the parallel projection 6 plays a very important role in preventing slip or reverse rotation, thereby preventing the work from dropping. In this way, a smooth transfer from the upstream belt conveyor to the downstream belt conveyor can be performed. In view of the function of the parallel projections in the present invention, the number of rows is preferably four or more, but may be appropriately selected depending on the shape, weight, and the like of the work to be conveyed.

The parallel projections need not always be formed continuously, but may be intermittent. Further, it is not necessary to form the auxiliary roller over the entire width, but it is sufficient that the auxiliary roller is formed at a portion where the work passes. Furthermore, it is not always necessary to be parallel to the axial direction of the auxiliary roller, and it may be formed with a certain inclination depending on the shape of the work. The shape, the number of rows, the forming method, and the like of the parallel projections may be appropriately determined according to the shape, weight, and the like of the workpiece, taking into consideration its drop prevention function, strength, ease of manufacture, and the like.

[0024]

[Embodiment 2] In the work transfer device of this embodiment, instead of providing a projection on the auxiliary roller, the static friction coefficient of the surface of the auxiliary roller having a circular cross section is increased, and the work is transferred between the belt conveyor and the auxiliary roller. It is intended to prevent being restrained in between. Since only the part of the auxiliary roller 4 is different from that of the first embodiment shown in FIGS. 1 and 3, the description and illustration of the whole configuration are omitted. FIG. 5 is a cross-sectional view illustrating a state in which a rotatable cylindrical auxiliary roller 4 is disposed in a gap between the ends of the upstream conveyor 1a and the downstream conveyor 1b of the belt conveyors connected in the conveying direction. FIG.

The surface layer 14 of the auxiliary roller 4 is formed of a material having a high coefficient of friction, for example, rubber. The coefficient of static friction at the contact surface between the auxiliary roller 4 and the work 2 may be, for example, about 0.5, and a material having a large friction coefficient may be used only for the surface layer portion of the auxiliary roller, or may be entirely composed of this. Good. Also, various high friction materials having a large surface roughness can be used as the material. Alternatively, the surface thereof may be subjected to a roughening treatment such as a satin finish or an unevenness treatment such as knurling. Also, a number of small projections may be provided on the surface to increase the apparent coefficient of friction.

In the work transfer apparatus of the present embodiment, the auxiliary roller 4 may passively rotate freely or may rotate synchronously with the conveyor by a rotary driving device. Further, the rotation direction of the auxiliary roller is the same as the traveling direction of the belt conveyor, and when the transport direction of the belt conveyor is reversed, the auxiliary rollers rotate together in the reverse direction.

The points to be considered in calculating the coefficient of static friction at the contact surface between the auxiliary roller 4 and the work 2 in this embodiment will be described below with reference to FIG. When the work 2 is conveyed by the belt conveyor 3a and the center of gravity G of the work 2 has passed the vertex Q of the arc at the end of the upstream belt 3a, the work 2 inclines slightly forward, and at point P, the auxiliary roller 4 Assume contact At this time, frictional force F _r at the contact point P is a driving force for advancing rotated auxiliary roller 4, a circumferential component force W _r (= W · sinα) reverse rotation of the driving force of gravity W.

The frictional force F _r is the F _n is a normal direction component force of the resultant force F of the driving force D and the workpiece gravity W of the workpiece, multiplied by a coefficient of static friction of the contact surface mu at mu · F _n expressed. And W _r is greater than F _r, auxiliary roller 4 is caused reverse rotation or slipping, the work 2 is depressed downward, for example, come to a position represented by broken lines, the contact points of the workpiece 2 and the auxiliary roller 4 below To P '. In this state, W _r
If >> _Fr , the auxiliary roller loses the force to lift the work and rotate forward, and eventually the contact surface between the upstream belt 3a and the work 2 slips, so that the work is in a so-called biting state. .

Here, to _satisfy F _r > W _r , the coefficient of static friction μ of the contact surface must _satisfy the following relationship. μ> (W / F _n ) · sin α In the above equation, if F _n is considerably larger than W and the angle α between P in the normal direction and the vertical direction is smaller than 45 °, μ is equal to 0. If the number is about 5, the above relationship is satisfied, and the drop of the work is reliably prevented, and the smooth connection is possible. The static friction coefficient μ of the contact surface depends not only on the characteristics of the auxiliary roller surface but also on the characteristics of the work side surface. However, since the lower surface of the heavy workpiece is generally made of an iron-based material, any material having a static friction coefficient with iron of 0.5 or more can be widely used.

In the case of an auxiliary roller provided with a drive mechanism, if the coefficient of friction of the surface of the auxiliary roller is sufficiently large, even if the work 2 falls once between the conveyor belt 3a and the auxiliary roller 4, the load on the work 2 is large. By increasing the frictional force, the tip of the work 2 can be lifted and smoothly transferred to the downstream belt conveyor.

[0031]

According to the present invention, it is possible to reliably prevent the work from dropping or biting at the connecting portion of the belt conveyor. INDUSTRIAL APPLICABILITY The work transfer device of the present invention is particularly useful in the case of a work having a large deviation in the center of gravity or a work having unevenness on the lower surface and fulcrums dispersed. Further, the workpiece transfer device of the present invention has a relatively simple structure, a small maintenance load, and can be applied to reciprocating conveyance as it is.

[Brief description of the drawings]

FIG. 1 is a perspective view of a work transfer device according to a first embodiment of the present invention.

FIGS. 2A and 2B are a cross-sectional view and a side view showing an example of a shape of a parallel projection and a mounting structure in the first embodiment.

FIG. 3 is a perspective view of a work transfer device according to another embodiment of the first embodiment.

FIG. 4 is an explanatory diagram of an operation of a parallel projection in the first embodiment.

FIG. 5 is an explanatory diagram of a force acting on an auxiliary roller surface in a workpiece transfer device according to a second embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an example of a conventional method of connecting and disconnecting a belt conveyor.

[Explanation of symbols]

 1a, 1b Upstream, downstream conveyor 2 Work 3a, 3b Upstream, downstream belt 4 Auxiliary roller 5a, 3b Bearing 6 Projection member 7 Screw 8 Parallel projection 9 Bottom of notch 10 Rotary drive mechanism 11 Motor for auxiliary roller Reference Signs List 12 driving force transmission mechanism 13 control device 14 surface layer of auxiliary roller G center of gravity of work P contact point of work and auxiliary roller Q vertex of arc at the end of upstream belt α angle between normal direction and vertical direction at point P

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[Procedure amendment]

[Submission Date] November 26, 1999 (1999.11.
26)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

Wherein said auxiliary roller has a driving source for driving the said belt conveyor and the workpiece Noriutsuri apparatus according to claim 1, characterized in that it is driven synchronously.

3. The work transfer device according to claim 2 , wherein the auxiliary roller is driven from a driving source of the belt conveyor via a driving force transmitting unit.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

In order to solve the above-mentioned problems, a work transfer device according to the present invention comprises a rotatable cylindrical auxiliary roller between adjacent ends of a belt conveyor connected in a conveying direction. Is a work transfer device in which the upper surface is arranged at substantially the same height as the upper surface of the belts on both sides, and a plurality of parallel bar-shaped projecting members extending in the width direction on the surface of the auxiliary roller are provided on the surface of the auxiliary roller. Exchangeable
It is characterized by having been attached . The parallel projection may be formed integrally with the auxiliary roller, or may be a rod-shaped projection member joined or engaged with the auxiliary roller surface . As this, by providing a parallel projection on the auxiliary roller surface, and transmitted to the auxiliary roller without loss propulsion of the workpiece can be a Noriutsuri work. Further, even if a slip occurs on the contact surface between the work and the auxiliary roller, since the side surface of the parallel projection abuts on the front end surface or the bottom surface of the work,
Work fall can be prevented.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007] The onset Ming Wa over click Noriutsuri apparatus, in between the adjacent ends of the continuously provided by a belt conveyor in the conveying direction, a rotatable auxiliary roller is the upper surface is substantially flush with the sides belt upper surface It is arranged in such a way that the surface of the auxiliary roller is formed of a material having a large friction coefficient, or the surface of the auxiliary roller is subjected to a roughening treatment or an unevenness treatment to increase the friction coefficient of the surface,
The auxiliary roller may be configured to rotate in the traveling direction by contacting the conveyed work . In this way, when the workpiece conveyed by increasing the static friction coefficient of the contact surface between the workpiece and the auxiliary roller hits, the workpiece rotates in the advancing direction, and slips on the contact surface to move the workpiece between the auxiliary roller and the upstream belt. The work can be fed in the traveling direction by reliably preventing the work from dropping.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masayuki Enomoto 118 Futatsuka Noda City, Chiba Prefecture Kawasaki Heavy Industries Noda Factory Co., Ltd. (72) Inventor Masahiro Shimada 118 Futatsuka Noda City Chiba Prefecture Kawasaki Heavy Industries Noda Factory ( 72) Inventor Yasuhiro Komon 118 Futatsuka, Noda City, Chiba Prefecture Kawasaki Heavy Industries Noda Factory F-term (reference) 3F044 AA01 AB12 AB13 CD01 CF00

Claims (5)

[Claims] 1. A workpiece transfer device comprising a rotatable auxiliary roller disposed between adjacent ends of a belt conveyor connected in a conveying direction such that the upper surface thereof is substantially at the same height as the upper surfaces of both belts. A plurality of parallel projections extending in the width direction on the surface of the auxiliary roller. 2. The work transfer device according to claim 2, wherein the parallel projection is formed by replacing a rod-shaped projection member on the surface of the auxiliary roller. 3. A workpiece transfer device comprising a rotatable auxiliary roller disposed between adjacent ends of a belt conveyor connected continuously in a transport direction such that the upper surface thereof is substantially at the same height as the upper surfaces of both belts. The surface of the auxiliary roller is formed of a material having a large friction coefficient, or the surface of the auxiliary roller is subjected to a surface roughening treatment or an uneven processing, and the auxiliary roller is brought into contact with a workpiece conveyed by the belt conveyor in a moving direction. A workpiece transfer device characterized in that the workpiece transfer device rotates. 4. The work transfer apparatus according to claim 1, wherein the auxiliary roller has a drive source for driving the auxiliary roller, and is driven synchronously with the belt conveyor. 5. The work transfer device according to claim 4, wherein the auxiliary roller is driven from a driving source of the belt conveyor via a driving force transmission unit.