Web-meandering preventing device

In a printing device operating in connection with a web upon a roll, means for controlling the web for preventing meandering or uncontrolled running of said web upon said roll, comprising:

• a machine frame, a relatively stationary shaft fixed to the frame;
• a core member rotatably mounted around the fixed shaft;
• a reel mounted around the core member, and the reel being adapted for having the web wound thereon in a rolled form for providing a roll of the web;
• the reel being rotatable on the shaft selectively to permit the web to wind off the roll and to take up the web onto the roll each time the reel is rotated;
• idle rotation restraining means between the reel and the core member for preventing the reel from idly rotating separately from the core member;
• axial positioning means for positioning the core member on the stationary shaft and with respect to the frame of the machine;
• elastic means for elastically biasing the core member axially of the stationary shaft and toward the axial positioning means for causing such engagement between the positioning means and the core member as to prevent the core member and the reel therearound from freely rotating thereby to prevent the web from running free of the roll, or onto the roll, and hence for preventing meandering running of the web;
• the idle rotation restraining means comprises friction means for frictionally connecting the reel around the core member for frictionally preventing the reel from idly rotating separately from the core member;
• the reel having an inner circumference around the core member, and the friction means including an idle-stoping leaf spring secured to the core member and having a free end frictionally abutting the inner circumference of the reel;
• and
• the free end of the leaf spring being bent in a direction with respect to the reel for allowing the reel to frictionally rotate together with the core member only in one direction.