There is provided a roller including: a shaft, and an elastic body portion that is provided on an outer peripheral surface of the shaft, in which the elastic body portion includes a plurality of first recessed portions which are provided on one side of the roller in a shaft mounting direction at intervals in a circumferential direction of the roller and each have a bottom portion, and a plurality of second recessed portions which are provided on the other side of the roller in the shaft mounting direction at intervals in the circumferential direction of the roller and each have a bottom portion, and in which each of the first recessed portions is positioned between the adjacent second recessed portions in the circumferential direction of the roller in the side view of the roller in the shaft mounting direction.

A roller includes a shaft, and an elastic body portion that is provided on an outer peripheral surface of the shaft, in which the elastic body portion includes an inner peripheral portion which becomes a shaft side, an outer peripheral portion which becomes an outer side with respect to the inner peripheral portion, a plurality of first connection portions which connect the inner peripheral portion and the outer peripheral portion, and a plurality of second connection portions which are provided in a space portion between the adjacent first connection portions and which partition the space portion into one side and the other side of the roller in the axial direction, and in which the first connection portion is inclined in the same direction in a peripheral direction with respect to a radial direction of the roller.

According to an embodiment, a sheet folding apparatus comprises a first roller, a second roller configured to be energized to the first roller, form a nip section together with the first roller, fold a sheet in half together with the first roller through the nip section and convey the sheet folded in half together with the first roller and a pressing force adjusting mechanism configured to be capable of increasing and decreasing a pressing force generated at the nip section. The pressing force adjusting mechanism causes a pressing force in a state of being conveying the sheet folded in half to be lower than that in a state of being folding the sheet in half.

According to an embodiment, a sheet folding apparatus comprises a first roller, a second roller configured to be energized to the first roller, form a nip section together with the first roller, fold a sheet in half together with the first roller through the nip section and convey the sheet folded in half together with the first roller and a pressing force adjusting mechanism configured to be capable of increasing and decreasing a pressing force generated at the nip section. The pressing force adjusting mechanism causes a pressing force in a state of being conveying the sheet folded in half to be lower than that in a state of being folding the sheet in half.

A conveying system and a battery production system are provided. The conveying system is used for sheet conveying, and includes: a driving roller making contact with a sheet; and a press roller arranged correspondingly to the driving roller, the press roller abutting against at least part of the surface of the sheet facing away from the driving roller and pressing the sheet against the driving roller. The press roller includes: a main shaft with a central axis; at least one hollow rubber roller detachably sleeving the main shaft; and at least one pair of fixing clamp rings arranged on two sides of the hollow rubber roller along the central axis so as to fix the position of the hollow rubber roller on the main shaft along the central axis, where an outer diameter of the fixing clamp ring is less than that of the hollow rubber roller.

According to an embodiment, a sheet folding apparatus comprises a first roller, a second roller configured to be energized to the first roller, form a nip section together with the first roller, fold a sheet in half together with the first roller through the nip section and convey the sheet folded in half together with the first roller and a pressing force adjusting mechanism configured to be capable of increasing and decreasing a pressing force generated at the nip section. The pressing force adjusting mechanism causes a pressing force in a state of being conveying the sheet folded in half to be lower than that in a state of being folding the sheet in half.

A paper-sheet feeding unit includes: a feed roller configured to be rotated when feeding out a paper sheet, the feed roller having a high friction portion placed on a part of a circumference of an outer circumferential surface thereof, and a low friction portion placed on a location of the outer circumferential surface thereof other than the high friction portion, the low friction portion having a frictional coefficient smaller than that of the high friction portion; and a gate member arranged to be pressed against the outer circumferential surface of the feed roller, the gate member constituting a gate section configured to separate, one by one, the paper sheets fed out by the feed roller.

A guidance and maintenance machine (100) includes a guide roller (102) and an application roller (104), each having a plurality of respective grooves (102a, 104a) defined on a respective circumferential surface (102b, 104b). The guidance and maintenance machine includes at least one preparation comb (200) having a support (202) with an upper surface (202d) from which a plurality of teeth (204) extend. The teeth, with a predetermined uniform height, are aligned in parallel along a length of the support and are positioned at a pitch between them in correspondence with corresponding grooves (102a) of the guide roller (102) so that the comb (200) feeds filaments (50) from a supply creel (304), where the filaments are stored, to the guide roller (102) at a predetermined pitch positioning outside the guide roller.

Disclosed is a soft tube of a sheet conveying portion of a sheet conveying roller, including: a region with irregularities in an outer peripheral surface of the soft tube. The region has a root mean square slope Sdq within a range of 0.03 to 0.50.