Curved belt conveyor
Roller-guided conveyors are described herein. An example roller-guided conveyor comprises a first holder and a second holder and a first guide roller and a second guide roller. The first guide roller has a first axis of rotation and pivotally coupled to the first holder about a pivot axis that is eccentric relative to the first axis of rotation. The first guide roller is spaced a distance from the second guide roller to guide a conveyor belt therebetween.
1. A belt conveyor frame assembly, comprising:
a first holder and a second holder opposite the first holder,
a first roller coupled to the first holder;
a first pivot element pivotally coupled relative to the second holder to pivot about a first axis; and
a second roller rotationally mounted relative to the first pivot element to rotate about a second axis, the first axis being parallel to, and spaced apart from, the second axis, the first pivot element is to enable the second roller to pivot away from the first roller when the first pivot element is rotated in a first direction about the first axis and to enable the second roller to pivot toward the first roller when the first pivot element is rotated in a second direction about the first axis.
2. A belt conveyor frame assembly as defined in claim 1 , further comprising a third holder and a fourth holder opposite the third holder, and a third roller coupled to the third holder.
3. A belt conveyor frame assembly as defined in claim 2 , further comprising a second pivot element pivotally coupled relative to the fourth holder to pivot about a third axis.
4. A belt conveyor frame assembly as defined in claim 3 , further comprising a fourth roller rotationally mounted relative to the second pivot element to rotate about a fourth axis, the third axis being parallel to, and spaced apart from, the fourth axis, the second pivot element is to enable the fourth roller to pivot away from the third roller when the second pivot element is rotated in a third direction about the third axis and to enable the fourth roller to pivot toward the third roller when the second pivot element is rotated in a fourth direction about the third axis.
5. A belt conveyor frame assembly as defined in claim 3 , wherein the first, second, third, and fourth roller holders comprise a one-piece frame.
6. A belt conveyor frame assembly as defined in claim 3 , further comprising a conveyor belt having an engagement element to be guided by the first and second rollers and the third and fourth rollers.
7. A belt conveyor frame assembly as defined in claim 6 , wherein the engagement element comprises a bead end, the first and second rollers are spaced apart to receive the bead end of the belt therebetween.
8. A belt conveyor frame assembly as defined in claim 6 , wherein the third and fourth rollers are spaced apart to receive the bead end of the curved belt therebetween.
9. A belt conveyor frame assembly as defined in claim 3 , wherein the first, second, third, or fourth rollers include ball bearings.
10. A belt conveyor frame assembly as defined in claim 3 , wherein the first and second rollers form an upper pair of rollers and the third and forth rollers form a lower pair of rollers, wherein the first pair of rollers are alternately arranged relative to the second pair of rollers.
11. A belt conveyor frame assembly as defined in claim 1 , wherein the first pivot element comprises a lever.
12. A belt conveyor frame assembly as defined in claim 1 , wherein the first pivot element is pivotably fixed in an intermediate position between a first position at which the second roller is away from the first roller and a second position at which the second roller is adjacent the first roller.