Conveyors: power-driven – Conveyor section – Endless conveyor
Reexamination Certificate
2003-06-12
2004-12-28
Bidwell, James R. (Department: 3651)
Conveyors: power-driven
Conveyor section
Endless conveyor
C198S847000
Reexamination Certificate
active
06834760
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention belongs to the technical field of conveying belts and relates to a deformed conveying belt comprising a conveying belt and a resin moulding fixed to the conveying belt.
PRIOR ART
A curved conveyor is known wherein its conveying surface is curved when seen in a plane. This curved conveyor comprises two conical or truncated-conical or cylindrical rollers rotating on approximately horizontal axes and being arranged at an angle to each other when seen in a plane and a conveying belt being formed into an umbrella with a hole opened in the center thereof and being put on the two rollers, and the curved conveyor has an approximately semi-circular conveying surface. In the present context the umbrella is a shape formed by a conical slope. In this curved conveyor, due to its construction, the conveying belt is subjected to a force that pulls the conveying belt towards its inner circumference. Hence, as shown in
FIG. 8
, a resin moulding
102
, of which section is a U toppled sidewise, is fitted on the entire length of the outer circumference rim of the conveying belt
101
, and guide rollers
103
,
104
are made to press against a thicker part which is formed on the inner circumference side of the resin moulding
102
to receive the tensile force acting on the conveying belt
101
.
Another conveyor is known wherein a conveying belt is put on two rollers, resin mouldings which extend in the width direction are provided as crossarms on the conveying surface of the conveying belt at approximately constant intervals in the longitudinal direction thereof, and products being placed on the conveying surface are pushed by these crossarms to be conveyed.
Problems to be Solved by the Invention
A requirement common to deformed conveying belts comprising a conveying belt and a resin moulding or resin mouldings fixed on the belt is that the resin moulding or mouldings should be flexible. The reason for this is as follows. When the deformed conveying belt moves over a roller, the resin moulding or mouldings will be subjected to bending forces. If the resin moulding lacks flexibility, for example, the resin moulding will suffer cracks and eventually break up. In particular, when the diameter of the roller is reduced for compactification, the bending force will get larger and the resin moulding will be required to have a higher flexibility. In the case of a deformed conveying belt for a curved conveyor, as a resin moulding, which is formed straight, is bent and fitted on a curved conveying belt along its outer circumference, strains tend to be generated near the joint between the resin moulding and the conveying belt and conditions of stresses are complex. To absorb such stresses, the resin moulding is required to have high flexibility. To cope with this problem, in the case of the deformed conveying belt shown in
FIG. 8
, the resin moulding is sewn onto the conveying belt to absorb stresses.
Moreover, these deformed conveying belts are required that their resin mouldings should have excellent wear resistance. The reason is that the resin mouldings will contact guide rollers or products. If their wear resistance is deficient, the resin mouldings will wear out and break.
The present invention was made in the light of these points, and its object is to increase the flexibility of the resin moulding so as to prevent it from being damaged by bending forces and the like and to increase the wear resistance of the resin moulding so as to prevent it from being damaged by wear through the use of so-called two-color moulding wherein two kinds of resin having different hardnesses are combined together, namely, a resin part of low hardness is welded and/or bonded to the conveying belt and a resin part of high hardness is made to contact articles such as guide rollers and products.
Means to Solve the Problems
To accomplish the above-mentioned object, the deformed conveying belt may be a deformed conveying belt comprising a conveying belt on which a resin moulding is fixed, said resin moulding comprising a body being welded and/or bonded to th conveying belt and a contacting part being made of a resin of which hardness is greater than that of the body and being combined with the surface of the body to contact an article.
When the resin moulding of this deformed conveying belt is subjected to bending forces or the like, as the body is formed of a resin of low hardness and has high flexibility, the resin moulding will be prevented from being damaged by deformation. When the resin moulding contacts an article, as the contacting part is formed of a resin of which hardness is higher than that of the body and has high wear resistance, the resin moulding will be prevented from being damaged by wear.
The deformed conveying belt may be a deformed conveying belt as described above wherein the conveying belt is formed into umbrella or a disk or an umbrella or a disk with a hole opened at the center thereof, and the resin moulding comprises a body being formed into a cone in section and being welded and/or bonded to the face and/or the tail of the conveying belt at the outer circumference rim of the conveying belt and a contacting part being made of a resin of which hardness is greater than that of the body and being combined with the surface of the slope of the body on the inner circumference side thereof to contact guide rollers.
When the resin moulding of this deformed conveying belt is subjected to bending forces or the like, as the body is formed of a resin of low hardness and has high flexibility, the resin moulding will be prevented from being damaged by deformation. When the resin moulding contacts guide rollers, as the contacting part is formed of a resin of which hardness is higher than that of the body and has high wear resistance, the resin moulding will be prevented from being damaged by wear.
The deformed conveying belt may be a deformed conveying belt as described above wherein the resin moulding comprises a body being formed into a cone in section, extending in the direction of width of the conveying belt and being welded and/or bonded to the conveying belt and a contacting part being made of a resin of which hardness is greater than that of the body and being combined with the surface of one of the slopes of the body to contact a product.
When the resin moulding of this deformed conveying belt is subjected to bending forces or the like, as the body is formed of a resin of low hardness and has high flexibility, the resin moulding will be prevented from being damaged by deformation. When the resin moulding contacts a product, as the contacting part is formed of a resin of which hardness is higher than that of the body and has high wear resistance, the resin moulding will be prevented from being damaged by wear.
Advantageously, the contacting part of the resin moulding is bonded on the surface of the body, preferably by coextrusion.
REFERENCES:
patent: 4955466 (1990-09-01), Almes et al.
patent: 5360102 (1994-11-01), Schoning
patent: 5394977 (1995-03-01), Cline
patent: 0 716 034 (1996-06-01), None
patent: 1 129 966 (2001-09-01), None
Bidwell James R.
Habasit AG
Hodgson & Russ LLP
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