Timing gear having different keyways

A timing gear device comprising:

• a first rotatably supported shaft;
• a first gear, having a predetermined number of circumferentially spaced teeth, engaged on and carried by said first shaft;
• a second rotatably supported shaft spaced from said first shaft;
• a second gear, having a predetermined number of circumferentially spaced teeth, engaged on and carried by said second shaft;
• a means for engaging said first gear and said second gear;
• and,
• a timing means for changing the rotative position of the second shaft and said second gear in relation to said first shaft and said first gear, said timing means comprising:
• a single primary keyway located in said second shaft,
• a plurality of secondary keyways located in said second gear, wherein said secondary keyways have differing configurations including a keyway having an arcuate closed end and a keyway having a wedge-shaped closed end, and
• a key in said primary keyway, said key being engaged in a predetermined one of said secondary keyways to establish an accurate indexing between said first gear and said second gear.

A timing gear device comprising:

• a first rotatably supported shaft;
• a first gear, having a predetermined number of circumferentially spaced teeth, engaged on and carried by said first shaft;
• a second rotatably supported shaft spaced from said first shaft;
• a second gear engaged on and carried by said second shaft, said second gear having a central shaft receiving opening and having a predetermined number of circumferentially spaced teeth;
• a means for engaging said first gear and said second gear;
• and,
• a timing means for changing the rotative position of the second shaft and said second gear in relation to said first shaft and said first gear, said timing means comprising:
• a single primary keyway located in said second shaft,
• a plurality of secondary keyways located in said second gear and opening radially inwardly into said central shaft receiving opening, wherein said secondary keyways have differing configurations including a keyway having an arcuate closed end and a keyway having a wedge-shaped closed end, and
• a key in said primary keyway, said key being engaged in a predetermined one of said secondary keyways to establish an indexing and driving engagement between said second shaft and said second gear.