A jig used in a method for adhering a guide ring made of an elastic body to an inner circumferential surface of a cylindrical roller, said method characterized by:
- using a jig provided with a holding protrusion from an upper surface of a supporting base;
- overlaying said guide ring on an outer circumferential surface of said holding protrusion;
- reducing pressure from an inner circumferential side of said guide ring through a decompression hole opened in the outer circumferential surface of said holding protrusion, to bring said guide ring into close contact with the outer circumferential surface of said holding protrusion;
- applying an adhesive to an outer circumferential surface of said guide ring;
- overlaying said roller on said guide ring from an end opening in an axis direction;
- releasing the pressure reduction to restore an outer diameter of said guide ring, to press the adhesive applied to the outer circumferential surface of the guide ring against the inner circumferential surface of said roller;
- and
- removing from said jig said roller having the inner circumferential surface to which said guide ring is adhesively fixed, wherein
- a holding protrusion having an outer diameter smaller than an inner diameter of said guide ring is disposed to protrude from an upper surface of a supporting base, and a decompression hole is opened in an outer circumferential surface of said holding protrusion, said jig comprises
- pressure reducing means for reducing pressure through said decompression hole in a state where said guide ring is fit onto said holding protrusion, to bring said guide ring into close contact with the outer circumferential surface of the holding protrusion and allow the guide ring to be compressed, and wherein
- a screw hole is opened in the center on the upper surface of said supporting base in a shape of a circular seat, an annular high step portion surrounding the screw hole is provided, an annular middle step portion is provided in an outer circumference of the high step portion;
- a decompression hole is opened in the middle step portion, and a low step portion including a surface of said supporting base is provided in an outer circumference of said middle step portion, while a disk-shaped top plate is provided that has a lower surface from which a screw rod protrudes that is to be screwed into the screw hole of said supporting base,
- the screw rod of said top plate is screwed into the screw hole of the supporting base, and said top plate is fixedly placed on an upper surface of said high step portion, to provide said holding protrusion having a gap provided between a lower surface of said top plate and an upper surface of said middle step portion, said decompression hole being opened to said gap, and
- said guide ring is fit onto the outer circumferential surface of said holding protrusion, and pressure is reduced through said decompression hole from said gap located in an intermediate portion of said holding protrusion, to allow pressure reduction from an inner circumferential side of said guide ring.