Ribbon spools for a reloadable cassette for a typewriter or similar office machine

A ribbon cassette for an office machine, comprising:

• a cassette housing removably mountable in the machine, said housing having an entrance opening, an exit opening, an openable cover and elements constituting deflection points;
• a supply spool and a take-up spool having a core, said take-up spool being mounted on a pivotable holder arm each of said spools being removably mounted in said cassette housing;
• a carbon ribbon initially wound in the form of a coil on said supply spool, said ribbon having a leading end at the outer surface of the coil to be received by said take-up spool core to permit said ribbon to be wound up on said take-up spool while being unwound from said supply spool;
• a supply roller having a sprocket wheel;
• a spring mechanism operable for pressing said carbon ribbon on said take-up spool against said sprocket wheel so that rotation of said supply roller winds said carbon ribbon onto said take-up spool;
• an actuating member disposed in said cassette housing operable for bringing said take-up spool into a latched position so that said supply roller is out of engagement with the carbon ribbon of said take-up spool, said actuating member comprising a pivotally mounted lever having one end bearing against the holder arm and another end forming a handle, actuation of said handle causing said holder arm to pivot said take-up spool away from said sprocket wheel, and said supply spool and said take-up spool can be exchanged by folding open said cover of said cassette housing;
• and
• fastening means secured to said leading end of said ribbon for threading said ribbon around said deflection points, said fastening means including a guide pin attached to the leading end of said ribbon and a handle portion separably connected to said guide pin by means of a frangible connection, said handle portion being broken from said pin after threading of said ribbon about said deflection points from the supply spool to the take-up spool;
• wherein said core is formed for enabling said fastening means to be fixed thereto to aid winding of said ribbon on said take-up spool.