Image forming apparatus

An image forming apparatus for forming desired images continuously onto print sheets, comprising:

• a printing part;
• a primary sheet feed mechanism for extracting one by one the print sheets stacked on a sheet feed table;
• and
• a secondary sheet feed mechanism situated near the primary sheet feed mechanism, said secondary sheet feed mechanism taking each print sheet extracted by said primary sheet feed mechanism and feeding said print sheet toward said printing part at a rate corresponding to the printing speed of said printing part;
• said secondary sheet feed mechanism comprising:
• a timing roller and a guide roller situated adjacent to each other, said timing roller and guide roller contacting said print sheet for feeding thereof;
• an electromagnetic clutch connected to one of said timing roller and said guide roller, said electromagnetic clutch, when actuated, activating the timing roller and guide roller to feed the sheet from the secondary sheet feed mechanism to the printing part;
• and
• control means electrically connected to the electromagnetic clutch, said control means having a device for detecting a rotating status of said printing part and supplying said electromagnetic clutch with an output signal in synchronism with said rotating status of said printing part to actuate the timing roller and the guide roller so that the sheet is fed to the printing part according to the rotating status while adjusting a sheet feed timing based on the rotating status.