In a stencil material conveyor system for conveying stencil material unrolled from a stencil material roll, the stretch or the shrinkage of the image on the conveyed stencil material is avoided. The residue of stencil material roll in a stencil material roll (21b) is calculated by a residue calculating means (65), by cumulatively subtracting a length of the stencil made from the total length of the stencil material roll stored in a storage means (70) of the stencil material roll (21b). The write pulse motor is rotated at a higher speed as the residue is reduced, thereby controlling the rotational speed of the platen roller (23) to compensate for reduction of the conveying distance due to slip of the platen roller (23) by the back tension applied to the stencil material and to convey the stencil material at a constant conveying speed.

Die vorliegende Erfindung bezieht sich auf eine bogenverarbeitende Maschine, insbesondere Bogendruckmaschine, mit mindestens einem Druck-/oder Lackwerk (1), einem Bogenfördermodul (12) und einem bedruckte und/oder lackierte Bogen in einem Stapelraum zu einem Auslegerstapel (9) ablegenden Ausleger (5).

Aufgabe der Erfindung ist es, eine bogenverarbeitende Maschine zu schaffen, die flexibel einsetzbar und bei ebenerdiger Installation ohne konstruktive Veränderung des Auslegers (5) wahlweise für Normalstapelbetrieb oder Hochstapelbetrieb konfigurierbar ist.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, dass die Bogen von dem Bogenfördermodul (12) auf ein zweites, gegenüber dem ersten höheres zweites Niveau (18) überführbar und an den zur Anpassung an das zweite Niveau (18) unter Vergrößerung des Stapelraums erhöht anordenbaren Ausleger (5) übergebbar ist.

A stencil printing machine and a control method is provided wherein first and second printing drums 25 and 26 are rotatably supported in close proximity to an outer periphery of a press drum 27 at positions spaced by a given angle, wherein outer circumferential peripheral walls of the first and second printing drums 25 and 26 carry stencil clamping bases 28, respectively, and inner press rollers 33 are located inside the printing drums 25 and 26, respectively. During printing operation, the printing drums 25 and 26 are rotated with a rotational phase angle of 180 degrees relative to the press drum and, at termination of printing operation, the printing drums 25 and 26 are stopped at respective stationary rest positions which are out of ink stain zones of respective printing drums.

A stencil printing machine and a control method is provided wherein first and second printing drums 25 and 26 are rotatably supported in close proximity to an outer periphery of a press drum 27 at positions spaced by a given angle, wherein outer circumferential peripheral walls of the first and second printing drums 25 and 26 carry stencil clamping bases 28, respectively, and inner press rollers 33 are located inside the printing drums 25 and 26, respectively. During printing operation, the printing drums 25 and 26 are rotated with a rotational phase angle of 180 degrees relative to the press drum and, at termination of printing operation, the printing drums 25 and 26 are stopped at respective stationary rest positions which are out of ink stain zones of respective printing drums.

In the multi-drum type rotary stencil printer adapted to drive a plurality of printing drums (10;12) altogether in synchronization with one another by a common drive mechanism (68,70,72,50), when one of the printing drums is placed out of engagement with a printing, a degradation of ink is anticipated in the temporarily rested printing drum due to its excessive stirring during an idling rotation. In order to avoid such an ink degradation, a clutch (64) is incorporated in a route of transmitting a driving force from the common drive mechanism to each of the printing drums, so that the transmission of the driving force through each of the route can be selectively interrupted.

A motor control system includes a processor (1) having a clock output terminal (CLK1,CLK2) for outputting clock pulses in desired cycles, a plurality of motors (MP1,MP2,MP3), and a plurality of motor drivers which are provided one for each motor and drive the corresponding motors on the basis of the clock pulses input into the motor drivers through their respective clock input terminals (CLK1',CLK2'). The clock input terminals of the motor drivers are connected to the clock output terminal of the processor in common with each other.

A stencil printer includes a rotary printing drum (10) around which the stencil master (M) is wrapped, a main motor (25) which rotates the printing drum, a press roller (81) which is rotatable in parallel to the printing drum in contact with the printing drum, and a pair of opposed conveyor rollers (51,52) which feed a printing paper between the printing drum and the press roller so that the leading end of the printing paper meets the printing drum in a predetermined position of the printing drum. A conveyor roller motor (56) is provided separately from the main motor and drives the conveyor rollers. A reference position sensor (30) detects a reference position on the printing drum, a printing drum rotation detector (21) detects rotation of the printing drum on the basis of the reference position, and a conveyor roller rotation detector (61) detects rotation of at least one of the conveyor rollers. A conveyor roller controller controls the conveyor roller motor on the basis of the rotation of the printing drum and the rotation of the conveyor roller so that the leading end of the printing paper meets the printing drum in the predetermined position of the printing drum.