Apparatus for alternatively cleaning two adjacent cylinders supported between first and second side walls of a printing machine, said apparatus comprising:
- a single cleaning device set parallel to and between the two cylinders, said cleaning device
- (a) having a longitudinal axis,
- (b) having first and second end shoulders at opposite longitudinal ends thereof,
- (c) forming an overall structure having resistance to torsional stresses, and
- (d) having a cleaning member which selectively contacts the first and second cylinders to be cleaned;
- first and second spindles attached to outer flanks of said first and second end shoulders and aligned (a) axially with each other, (b) parallel to the longitudinal axis of the cleaning device and (c) at a suitable distance from the cleaning member;
- first and second parallel arms having (a) respective first and second distal ends, (b) respective first and second intermediate parts, and (c) respective first and second proximal ends, said first and second distal ends being respectively connected to said first and second spindles such that respective said first and second end shoulders pivot on respective first and second distal ends of the respective said first and second parallel arms;
- a cross member which connects respective said first and second intermediate parts of said first and second parallel arms;
- first and second plates fixed to the respective first and second side walls of the printing machine and on which said first and second parallel arms respectively pivot at respective said first and second proximal ends thereof;
- an assembly of pneumatic actuators having (a) a proximal end which is pivotally mounted to said first proximal end of said first parallel arm, and (b) a distal end;
- a lug integral with one side of the first shoulder of the cleaning device to which the distal end of said assembly of pneumatic is pivotally attached;
- first and second rollers carried respectively by said first and second shoulders on respective opposite sides thereof from said lug and integrally on outer flanks of said first and second shoulders;
- first and second plates attached to the side walls of the printing machine and having formed therein respective first and second slotted cams having slotted profiles in which respective said first and second rollers ride;
- such that as a result of an extension or retraction of said assembly of pneumatic actuators, the first and second shoulders rotate in one direction or the other and position themselves so that said first and second rollers are at either of suitably profiled and oriented ends of said first and second slotted cams, in order to orient and correctly position the cleaning member of the cleaning device against one or other of the two cylinders to be cleaned.