Printing press with a dynamic expansion band adjusting mechanism

In a printing press having a running cylinder rotatable at a preselected speed and with a rotary axis and expansion bands for changing the effective outer diameter of the running cylinder, the improvement being a dynamic expansion band adjustment mechanism for moving the expansion bands while the running cylinder is rotating about the rotary axis, comprising:

• a cylindrical adjusting member with first and second engagement surfaces on different sides of the cylindrical adjusting member;
• means engageable with one of the first and second engagement surfaces for rotating the cylindrical adjusting member;
• another member having an engagement surface for engagement with the cylindrical adjusting member rotating means;
• means for driving the other member to rotate at substantially the same speed as the running cylinder;
• means including a member engaging the other of the first and second engagement surfaces for moving the expansion bands and in response to a rotational speed difference between the cylindrical adjusting member and the other member;
• and
• means for controlling the cylindrical adjusting member rotating means to produce a rotational speed difference between the cylindrical adjusting member and the other member.

In a printing press having a running cylinder with a rotary axis, a diameter and expansion bands for changing the diameter of the running cylinder, the improvement being a dynamic expansion band adjustment mechanism for moving the expansion bands while the running cylinder is rotating about the rotary axis, comprising:

• a cylindrical adjusting member with an inwardly facing engagement surface;
• means for mounting the cylindrical adjusting member for rotation about the rotary axis of the running cylinder;
• means rotating with the running cylinder and responsive to relative rotary movement between the cylindrical adjusting member and the running cylinder for moving the expansion bands;
• and
• means for rotatably moving the cylindrical adjusting member about the rotary axis relative to the running cylinder.

In a printing press having a running cylinder with a diameter, an axis of rotation and expansion bands for changing the diameter of the running cylinder, the improvement being a dynamic expansion band adjustment mechanism for moving the expansion bands while the running cylinder is rotating about the rotary axis, comprising:

• a cylindrical adjusting member having a plurality of engagement surfaces carried on an interrupted journal of the running cylinder for rotation about the axis of rotation of the running cylinder;
• means engaging one of the engagement surfaces for rotating the cylindrical adjusting member relative to the running cylinder;
• and
• means engaging another of the engagement surfaces for moving the expansion bands of the running cylinder.

In a printing press having a running cylinder with a diameter rotatable at a preselected speed with expansion bands for changing the diameter of the running cylinder, the improvement being a dynamic expansion band adjustment mechanism for moving the expansion bands while the running cylinder is rotating about the rotary axis, comprising:

• a cylindrical adjusting member having a plurality of engagement surfaces;
• a differential engages with one of the plurality of engagement surfaces;
• a cylindrical member having an outer engagement surface for engagement with the differential;
• means for driving the cylindrical member to rotate at a speed substantially equal to the preselected speed of the running cylinder;
• means for actuating the differential to produce a relative rotational speed difference between the cylindrical adjusting member and the cylindrical member;
• and
• means including a member engaged with another of the plurality of engagement surfaces of the cylindrical adjusting member for moving the expansion bands in response to the rotational speed difference between the cylindrical adjusting member and the cylindrical member.