Plate holding device for offset duplicator

A printing plate holding device for an offset duplicator, said holding device being positioned in a grooved portion of a plate cylinder and confronting a tail clamp device, said holding device comprising:

• a base positioned along one side of said grooved portion and slidably secured thereto in a horizontal plane;
• a clamp plate pivotally secured to said base and provided with a first pin;
• a clamp lever fixed to said clamp plate and provided with a second pin;
• a latch loosely secured to said second pin of said clamp lever and connected to a spring so as to provide a plate clamping force to said clamp plate, said latch being engageable with a bracket of said base so as to maintain said clamp plate at an open position;
• a guide plate and a plate release preventing plate both fixed to an outer longitudinal side of said base;
• axial displacement control means positioned at one longitudinal end of said cylinder;
• circumferential displacement control means positioned at the other longitudinal end of said cylinder;
• said axial displacement control means comprising a first knob rotatably extending through a slot formed in a first bracket fixed to said base, said first knob being threadingly engaged with said plate cylinder;
• and said circumferential displacement control means comprising a second knob rotatably extending through a slot formed in a second bracket fixed to said cylinder, said second knob being threadingly engaged with a third bracket fixed to said base.