Safety device for rotary printing press

A safety device for rotary printing press provided at the feeding side of an in-running nip formed by a rotary body having the center of the rotation thereof being displaceable in position, the safety device comprising:

• a guard member movably positioned in the vicinity of an outer circumferential surface of the rotary body;
• and
• a guard member displacement means positioned between the rotary body and the guard member for making the guard member displace in accordance with the displacement of the center of the rotation of the rotary body;
• wherein a gap between the outer circumferential surface of the rotary body and the guard member is set to be substantially constant in spite of the movement or shift of the center of the rotation of the rotary body;
• wherein the guard member displacement means is constituted of an actuator means, a bearing means and a cam;
• wherein the actuator means is composed of a link mechanism;
• wherein a driving source of the link mechanism is an actuator;
• wherein a tip of a rod of the actuator is coupled movably in angular displacement to an end portion of one of two arms divaricating at an obtuse angle from a center of a crotch arm by making use of a bracket which supports a head side of the actuator as a cardinal point of angular displacement;
• and
• wherein the rotary body is constituted of a blanket cylinder movably shifted to a contact position and a non-contact position with respect to a printing cylinder having the center of the rotation thereof being fixed;
• whereby said movable shifting of the blanket cylinder is detachably done in accordance with extension and retraction of the rod of the actuator.

A safety device for rotary printing press provided at the feeding side of an in-running nip formed by a rotary body having the center of the rotation thereof being displaceable in position, the safety device comprising:

• a guard member movably positioned in the vicinity of an outer circumferential surface of the rotary body;
• and
• a guard member displacement means positioned between the rotary body and the auard member for making the guard member displace in accordance with the displacement of the center of the rotation of the rotary body;
• wherein a gap between the outer circumferential surface of the rotary body and the guard member is set to be substantially constant in spite of the movement or shift of the center of the rotation of the rotary body;
• wherein the rotary body is constituted of a blanket cylinder movably shifted to a contact position and a non-contact position with respect to a printing cylinder having the center of the rotation thereof being fixed;
• and
• wherein the guard member is included in a guard means, said guard means further comprising:
• a bracket attached to each of the two frames opposing with each other;
• a stepped or joggled pin installed in a stepped hole of each of the brackets;
• an L-shape arm fitted movably in angular displacement to each stepped pin with a snap or retaining ring for a shaft;
• and
• the guard member is positioned between the two frames in parallel with the center of the shaft of the blanket and arranged to be a little longer than the length of the outer circumferential surface of the blanket cylinder.

A safety device for a rotary printing press including a body rotating about an axis, the body having a cylindrical surface at a first radial dimension with respect to the axis, the axis being displaceable with respect to a frame between first and second positions, the second position being substantially parallel to and laterally spaced from the first position, the safety device comprising:

• a cam displaceable with the axis, the cam having an arcuate surface at a second radial dimension with respect to the axis, the second radial dimension being greater than the first radial dimension;
• and
• a guard contiguously engaging the cam, the guard including:
• a bracket fixed with respect to the frame;
• a member pivotally coupled to the bracket;
• and
• a resilient element extending between the bracket and the member, the resilient element biasing the member to pivot into engagement with the arcuate surface of the cam such that the member remains spaced from the cylindrical surface of the body by a substantially constant gap as the axis is displaced between the first and second positions, the substantially constant gap being equal to the difference between the first and second radial dimensions.