Patent ID: 8662138

Claim:
A sheet guide of a sheet shutter including: a sheet case configured to laterally and rotatably journal therein a sheet drum for winding and unwinding a sheet in the vertical direction; support posts respectively provided to support both the left and right ends of the sheet case; and a sheet guide section fixed to each of the support posts so as to guide the up and down movement of the sheet, wherein the sheet guide section is configured by an outer rail having a U-shaped cross section which is provided with a pair of front and rear side walls and is opened toward the inner side in the left and right direction of a horizontal cross section of the left and right support posts, and an inner rail accommodated and detachably attached in the outer rail along the inner surface of the outer rail, wherein the inner rail is provided with an engagement guide facing the inner side in the left and right direction and configured to vertically slidably and engagingly accommodate each of guide projections respectively attached to both ends of the sheet, wherein the inner rail is attached in the outer rail by a plurality of mounting pins, wherein a coil spring for resiliently pulling the guide projection to the outside direction is mounted on the outside of each mounting pin, wherein the inner rail is hollow, has front and rear side walls, and wherein the coil spring with the mounting pin inserted therein is accommodated in an inner locking section which is the space formed between the front and rear side walls of the inner rail.