Alignment/registration and conveyance apparatus
View Patent ↗An apparatus for registering sheet material while being conveyed along a feed path including: (i) a conveyance deck for conveying sheet material along a support surface, (ii) a registration member defining an abutment surface operative to align an edge of the sheet material as the sheet material is conveyed along the support surface of the conveyance deck, and (iii) a drive mechanism disposed adjacent to the registration member and along the conveyance deck. The drive mechanism includes a flexible belt disposed about and supported by at least two rolling elements, and a means for driving the flexible belt about the rolling elements. The flexible belt includes a twisted section defining a plurality of spiral edge segments operative to (i) frictionally engage a surface of the sheet material to urge the sheet material against the abutment surface and (ii) convey the sheet material along the conveyance deck.
1. An apparatus for registering sheet material while being conveyed along a feed path, comprising:
a conveyance deck for conveying sheet material along a support surface;
a registration member disposed adjacent the deck and defining an abutment surface operative to align an edge of the sheet material as the sheet material is conveyed along the support surface of the conveyance deck; and
a conveyance drive mechanism disposed adjacent to the registration member and along the conveyance deck, the drive mechanism including:
at least two rolling elements,
a continuous flexible belt disposed about and supported by the rolling elements, a section of the belt extending along the feed path and being twisted about an elongate axis of the flexible belt, the twisted belt section, defining a plurality of spiral edge segments;
a means for driving the flexible belt about the rolling elements,
wherein the spiral edge segments frictionally engage a surface of the sheet material to urge the sheet material against the abutment surface and convey the sheet material along the support surface of the conveyance deck; and
an idler roller opposing each of the spiral edge segments of the twisted belt section, each idler roller rotationally mounting below the support surface and having a peripheral surface portion extending through an aperture of the conveyance deck, the idler rollers operative to reduce frictional wear along each of the spiral edge segments and facilitate transport of the sheet material along the feed path.
2. The apparatus according to claim 1 wherein the conveyance deck supports the sheet material along a face surface and the spiral edge segments engage the sheet material along an opposing face surface to register and convey the sheet material along the feed path.
3. The apparatus according to claim 1 wherein the spiral edge segments define an acute angle θ with respect to the abutment surface of the registration member and an obtuse angle β with respect to the feed path of the sheet material.
4. The apparatus according to claim 3 wherein the acute angle θ is within a range of about ten (10) degrees to about thirty (30) degrees and wherein the obtuse angle β is within a range of about one-hundred and fifty (150) degrees to about one-hundred and seventy (170) degrees.
5. The apparatus according to claim 3 wherein the acute angle θ is within a range of about twenty (20) degrees to about twenty-five (25) degrees and wherein the obtuse angle β is within a range of about one-hundred and sixty (160) degrees to about one-hundred and sixty-five (165) degrees.
6. The apparatus according to claim 1 wherein the twisted belt section includes at least two (2) revolutions of twist to produce four (4) spiral edge segments.
7. The apparatus according to claim 1 wherein the twisted belt section includes at least two and one half (2 1/2 ) revolutions of twist to produce five (5) spiral edge segments.
8. The apparatus according to claim 1 wherein at least one of the rolling elements defines a center plane which bisects, and is normal to, the rotational axis of the at least one rolling element, and wherein the peripheral surface to each side of the center plane produces a substantially conical shape defining a cone angle relative to the rotational axis, the cone angle on one side of the center plane being greater than the cone angle on the other side of the center plane.
9. The apparatus according to claim 8 the cone angle on one side of the center plane is within a range of about a range of about fifteen (15) degrees to about thirty five (35) degrees and wherein the cone angle on the other side of the center plane is within a range of about forty (40) degrees to about sixty (60) degrees.
10. The apparatus according to claim 8 wherein the rolling elements at each end of the twisted belt section define an upstream rolling element and a downstream rolling element, and wherein the cone angles of the upstream rolling element are reversed relative to the cone angles of the downstream rolling element.
11. The apparatus according to claim 10 wherein the cone angle disposed proximal to the registration member of the upstream rolling element is substantially equal to the cone angle disposed distally from the registration member of the downstream rolling element.
12. The apparatus according to claim 1 wherein the rolling elements rotate about axes which are substantially orthogonal to the feed path and parallel to the support surface and wherein each of the rolling elements mounts to the registration member by an stub shaft projecting outwardly toward and vertically above the feed path of the sheet material.
13. The apparatus according to claim 1 wherein the idler rollers are banked at an angle a relative to the registration member which corresponds to the acute angle θ of each spiral edge surface.
14. The apparatus according to claim 1 wherein the continuous flexible belt is composed of a urethane material having strain properties which limit elongation to ten percent (10%) when under a maximum allowable stress.
15. The apparatus according to claim 1 wherein the continuous flexible belt has a width dimension of at least three tenths of one inch (0.30″) to accommodate sheet material of varying thickness.
16. The apparatus according to claim 1 wherein the continuous flexible belt has a width dimension of at least four tenths of one inch (0.40″) to accommodate sheet material of varying thickness.