Patent ID: 8925854
Filing Date: 2015-01-06
Classification: B65H

Abstract:
1. A paper roll fixing device of a printer for fixing a paper roll within said printer, said paper roll having a hollow shaft, said paper roll fixing device comprising: a first supporting member comprising a first supporting protrusion part and plural first auxiliary rollers, wherein said plural first auxiliary rollers are discretely arranged near a bottom edge of said first supporting member and located below said first supporting protrusion part, wherein said first supporting member further comprises a first bottom plate, wherein said first bottom plate is vertically extended from a bottom edge of a first inner surface of said first supporting member, and said plural first auxiliary rollers are discretely arranged on said first bottom plate, wherein said first supporting protrusion part is protruded from said first inner surface and comprises a first bump and a second bump, and said first bump is disposed over said second bump, wherein said first supporting member further comprises: a first through-hole formed in said first supporting member; a first shaft disposed on a first outer surface of said first supporting member; a first fixing slab pivotally coupled with said first shaft, and disposed within said first through-hole; a first elastic element located over said first shaft and connected with a first end of said first fixing slab, wherein said first bump is disposed on said first fixing slab, and said second bump is disposed on said first propping sheet, wherein through said first elastic element, said first bump on said first fixing slab is not protruded outside said first inner surface of said first supporting member, but a second end of said first fixing slab is protruded outside said first inner surface of said first supporting member; a second supporting member parallel with said first supporting member, and comprising a second supporting protrusion part and plural second auxiliary rollers, wherein said plural second auxiliary rollers are discretely arranged near a bottom edge of said second supporting member and located below said second supporting protrusion part, wherein said second supporting member further comprises a second bottom plate, wherein said second bottom plate is vertically extended from a bottom edge of a second inner surface of said second supporting member, and said plural second auxiliary rollers are discretely arranged on said second bottom plate, wherein said second supporting protrusion part is protruded from said second inner surface and comprises a third bump and a fourth bump, and said third bump is disposed over said fourth bump, wherein said first supporting protrusion part is inserted into said hollow shaft from a first end of said paper roll, and said second supporting protrusion part is inserted into said hollow shaft from a second end of said paper roll, so that said paper roll is fixed within a space between said first supporting member and said second supporting member, wherein said plural first auxiliary rollers and said plural second auxiliary rollers are pressed by two ends of an outer surface of said paper roll, respectively; a rotating wheel; a first movable track connected with said first supporting member, and engaged with said rotating wheel; and a second movable track parallel with said first movable track, connected with said second supporting member, and engaged with said rotating wheel, wherein said first movable track and said second movable track are linearly moved back and forth in a reciprocating manner through said rotating wheel, so that a distance between said first supporting member and said second supporting member is adjustable.