In one example, a conveyance module to advance a belt toward a print station comprises a support structure to support a belt and to permit advance of the belt in a belt-advance direction toward a print station and a pair of guides. In this example, each guide is attached to the support structure and is to engage a portion of a belt. A first guide in the pair is attached to the support structure by a substantially rigid fastener to hold the first guide in a substantially fixed position relative to the support structure. A second guide in the pair is attached to the support structure by a resiliently deformable element to hold the second guide in a movable position relative to the support structure.

An image forming apparatus includes a first roller having a first portion between tapered portions, which are at each end of the first portion. An outer diameter of each tapered portion decreases with distance from the first portion along a width direction of the first roller. A second roller has a second portion facing the first portion of the first roller and third portions, which are at each end of the second portion. The third portions face the tapered portions of the first roller. A belt of the image forming apparatus has an inner surface contacting the first portion of the first roller and an outer surface forming a nip with the second portion of the second roller. The belt has a protruding portion on the inner surface at each end of the belt in the width direction. The protruding portions face the tapered portions of the first roller.

A belt driving device includes an annular belt member, rotary members, a protrusion, and a removing member. The rotary members extend in parallel and rotate. The belt member is wound around the rotary members. The protrusion protrudes from an inner peripheral surface of the bel member. The protrusion extends along an edge of the belt member. The protrusion and each rotary member are arranged in an extending direction of the rotary member. The removing member includes a plate-shaped portion. The plate-shaped portion is in contact with an outer peripheral surface of the belt member at a location where the removing member faces one of the rotary members with the belt member being interposed therebetween, so as to remove unnecessary matters from the outer peripheral surface of the belt member. The removing member extends to an outside of end portions of the rotary members in the extending direction.

An image forming apparatus includes a first roller having a first portion between tapered portions, which are at each end of the first portion. An outer diameter of each tapered portion decreases with distance from the first portion along a width direction of the first roller. A second roller has a second portion facing the first portion of the first roller and third portions, which are at each end of the second portion. The third portions face the tapered portions of the first roller. A belt of the image forming apparatus has an inner surface contacting the first portion of the first roller and an outer surface forming a nip with the second portion of the second roller. The belt has a protruding portion on the inner surface at each end of the belt in the width direction. The protruding portions face the tapered portions of the first roller.

A belt driving device includes an annular belt member, rotary members, a protrusion, and a contact member. The belt member includes first and second edges. The belt member is wound around the rotary members. The protrusion protrudes from an inner peripheral surface of the belt member. The protrusion and each rotary member are arranged in an extending direction of the rotary member. The protrusion is provided at the second edge. The contact member is closer to the first edge. When the belt member deviates, the contact member comes into contact with the belt member. A difference between a position of the belt member when the protrusion comes into contact with an end surface of one of the rotary members and a position of the belt member when the belt member comes into contact with the contact member is equal to or less than a width of the protrusion.

A conveying unit (100) of a web, or sheet, of paper, or similar products, arranged to transfer along a transfer direction the web, or sheet, of paper, having a support (41) having a lateral surface (42) provided with at least one peripheral suction groove (43). A suction belt (45) is arranged to move along a closed trajectory (46) comprising the suction portion (44). The suction belt (45) is configured to air-tightly engage the suction portion and provides at least one through hole (47) arranged to be positioned at a respective suction portion (43) in order to cause a suction effect on the web, or sheet, and to transfer it from a first point P1 to a second point P2 of a production line of paper products. It is, furthermore, provided a driving device (60) configured to move the suction belt (45) with respect to the support (41).

A conveying unit (100) of a web, or sheet, of paper, or similar products, arranged to transfer along a transfer direction the web, or sheet, of paper, having a support (41) having a lateral surface (42) provided with at least one peripheral suction groove (43). A suction belt (45) is arranged to move along a closed trajectory (46) comprising the suction portion (44). The suction belt (45) is configured to air-tightly engage the suction portion and provides at least one through hole (47) arranged to be positioned at a respective suction portion (43) in order to cause a suction effect on the web, or sheet, and to transfer it from a first point P1 to a second point P2 of a production line of paper products. It is, furthermore, provided a driving device (60) configured to move the suction belt (45) with respect to the support (41).

A conveyor system pre-inserts a portion of the web into a first belt before the portion is gripped between the first belt and a second belt. In one exemplary embodiment, a pair of lips of a web are inserted into a corresponding first pair of belts and then the pair of lips are secured in the first pair of belts by inserting a second pair of belts into the first pair of belts over the pair of lips.