Abstract: A substrate bears holographic imagery, selected portions of which are covered by non-holographic imagery printed in predetermined geometric registry with the holographic images. Multiple replicas of this interactive graphic work are mass-produced by embossing an array of the holographic imagery into a substrate in roll form, together with eyemarks located periodically along the roll. Using these eyemarks, the roll is optically sheeted and the non-holographic imagery then printed on the holographic substrate.

Abstract: A registering tool and registering method enables adhering of flexographic printing plates to the cylindrical surface of a rotary press plate cylinder in a manner which assures that the upper and lower edges of the plate are aligned in a strictly parallel relationship with the axis of rotation of the plate cylinder. The tool includes a channel shaped elongated bar having side walls with lower edges which are rested on the cylindrical surface of the cylinder in parallel relationship with the axis of the cylinder. A row of register pin receiving openings extends along a side wall of the bar in parallel relationship with the lower edge of the side wall. The printing plate is temporarily pinned to the bar with register pins which are inserted into registration holes in the printing plate that are equidistant from the upper edge of the plate. A first portion of the plate is then adhered to the cylinder.

Abstract: A method and a device exactly aligning a printing image relative to a geometrically correct print position of a printing machine for printing carriers, for example CDs, which employ use of a printing foil having a hole system which has been aligned relative to the image center and being secured to a printing screen having locating bores which have been aligned relative to the image center and which correspond to locating pins of the printing machine which have been aligned relative to the carrier center.

Abstract: A system for imprinting stationery including envelopes, letters and cards with return addresses, sending addresses, letterheads and other indicia uses inexpensive self inking stamps. A horizontal rectangular top plate is provided with apertures through which the stamps pass when imprinting on a piece of stationery. The top plate is supported above a flat horizontal support surface on which the piece of stationery rests by a three sided fence which provides positioning stops for the stationery. The apertures are located at predetermined positions on the top plate so as to correctly position imprinting of sending addresses, return addresses and letterheads on stationery of various sizes. The positioning and registry is so well maintained that different colored stamps may be used in the same aperture to produce multicolor printing. By providing a system that produces high quality custom printed stationery as needed, the volume storage and expenses of preprinted stationery is avoided.

Abstract: A printing plate has an outer surface and an inner surface, the outer surface for receiving an image to be transferred to a printing blanket. The printing plate also includes a lead end and a tail end. A first bend and a second bend are formed at a first distance from the lead end of the printing plate, and a third bend is formed at a second distance from the lead end. A recessed portion is thereby formed between the second bend and the third bend, and an angular end portion is formed between the third bend and the lead end. The tail end of the printing plate is bonded to the recessed portion with an adhesive. In order to install the printing plate on the plate cylinder, the source of pressurized fluid is engaged to supply pressurized fluid, e.g. air, through the apertures of the plate cylinder. A press operator mounts an end of the printing plate onto the plate cylinder, aligning the angular end portion of the printing plate with the slot in the plate cylinder.

Abstract: A system for mounting a flexographic printing plate having a registration mark includes a printing plate support surface having a transparent portion formed therein, a plate cylinder, means operably connected to the plate cylinder for positioning the plate cylinder toward the printing plate support surface in a manner to establish a uniform contact line along one side of the printing plate when positioned on the printing plate support surface, a camera operably disposed adjacent another side of the transparent portion for taking a picture of the registration mark of the printing plate when the same is positioned over one side of the transparent portion and a monitor operably connected to the camera having means for viewing the registration mark and position thereof with respect to the camera in another embodiment which includes a pressure roller and method employing the same.

Abstract: A method for vertically aligning the color plate cylinders of a press, which prints a two-color image on paper, in order to eliminate the vertical misalignment of the colors in the image printed. The method requires the use of a cylinder positioner that is releasably mounted on the press and involves operating the press to initially print the image, detaching the cylinder positioner from the press, adjusting the position of a positioner stop on the cylinder positioner based on the amount of misalignment in the printed image, reattaching the cylinder positioner, decoupling a color plate cylinder from normal operation, rotating the press's blanket cylinder until it impacts the positioner stop on the cylinder positioner, recoupling the color plate cylinder and then operating the press to correctly print the image.

Abstract: A method for automatically feeding a printing plate in proper registry to a plate cylinder in a printing machine is disclosed. Pursuant to the disclosed method, a printing plate is advanced by a plate conveyor towards a clamping rail on the plate cylinder. After the leading edge is inserted into the clamping rail, the in-register condition of the leading edge of the printing plate is independently sensed at two sensing sites. If the leading edge of the printing plate is in register at only one site, the printing plate is released from the plate conveyor for a period of time to permit the printing plate to align itself. The printing plate is then held again by the plate conveyor and the advancement of the plate is resumed. This process is repeated until the independent sensors both indicate that registry has been achieved.

Abstract: A printing press blanket underliner is provided which allows for high quality printing on varying width items, such as envelopes, without the need for excess pressure on printing press blankets. The printing press blanket underliner is made of synthetic rubber of surgical quality and provides a resilient cushion underliner for printing press blankets.

Abstract: Printing plates that are to be attached to a plate cylinder are suspended by their leading edges on suspension edges of a shiftable plate preparation device. This device can be moved to a plate mounting position where it overlies a plate storage device that is integrated with an inking system protector. The printing plates can be removed from the plate preparation device and carried to the plate cylinder by a printing plate manipulating device.

Abstract: A system and method for controlling the registration of a multi-unit printing press for corrugated board materials permits the use of AC motors for driving the printing press. A master AC motor drives a master printing unit, and a master AC driving device is electrically coupled to the master AC motor for controlling the speed of the master AC motor. A master pulse generating device produces output pulses relating to the rotary motion of the master printing unit. A follower AC motor drives a follower printing unit, and a follower AC driving device electrically coupled to the follower AC motor controls the speed of the follower AC motor relative to the master AC motor. A follower pulse generating device produces output pulses relating to the rotary motion of the follower printing unit.

Abstract: A mechanism for securely clamping a priming plate (6) to a form cylinder (1), in which a cylinder groove (2) formed in the form cylinder (1) has rotatably mounted therein a clamping spindle (7), which has a gripper edge (10) which clamps a V-shaped chamfer (11) of the leading flange (5) of the priming plate (6). The trailing flange (9) of the priming plate (6) is grasped and clamped in a positive-locking manner by leaf springs (8) mounted to the clamping spindle (7) which are hook-shaped.

Abstract: It is the object of the invention to provide a printing method permitting a high printing quality and reducing the influences of the forces and fields acting on the printing material. The object is achieved in that, by means of two image-detecting arrangements disposed in the transport path of the printing material, image signals are obtained before and behind a device treating the surface of the printing material and are supplied to a control unit, and in that the changes of the outer dimensions are quantitatively determined on the basis of said image signals. The invention may be applied on printing machines.

Abstract: In an automatic plate exchange/plate registration method and apparatus, a current position of a plate cylinder on which a plate to be exchange is mounted is stored. The plate cylinder is reset to an origin. Automatic plate exchange is performed when the plate cylinder is at the origin. The plate cylinder is automatically returned to the stored current position.

Abstract: When operating parts, such as a plate cylinder (3), a chamber doctor blade (4), an inking cylinder (5) and an ink trough (6), are to be inserted in a printing machine (13), said operating parts (3,4,5,6) are temporarily secured to a frame (2) adapted to move on a carriage (1) transversely to the latter's direction of motion. Then, the carriage (1) is placed in position in front of the printing machine (13), the front panel of which has previously been removed. After this, the frame (2) is run partially into the printing machine (13), causing the operating parts (3,4,5,6) to be released from the frame (2), after which a device in the printing machine (13) transfers them to their final positions, in which they are held securely in the printing machine (13). When said operating parts (3,4,5,6) are to be removed from the printing machine (13), the procedure is carried out in the reverse sequence.

Abstract: A scanner senses the position of the individual images on the web. A cutting cylinder position is monitored by a signal generator, and may be altered by mechanically changing the phase of the cutting cylinders in relation to the image on the web based on commands relating to the image registration error, the first derivative of the image registration error and/or the second derivative of the image registration error.

Abstract: The invention relates to a method and apparatus for mounting flexographic printing plate in registration onto a printing cylinder with a mounting bar and a carrier sheet having the plate mounted thereto. The mounting bar and the carrier sheet each have multiple openings which are located to assure consistent alignment between the bar and carrier sheet. The carrier sheet is secured in registration to the mounting bar by aligning the openings of the bar to the carrier sheet and inserting locking pins into the aligned openings. The method for mounting a flexographic printing plate further includes an apparatus for retaining an end of the carrier sheet to prevent its movement while drilling or punching the multiple openings.

Abstract: A fastening leg of a fastening edge of a trailing end of a flexible plate is inserted into a cooperating mounting slit in a cylinder by utilization of a plate trailing end inserting device. The trailing end of the flexible plate is caused to arc outwardly prior to insertion of the fastening leg into the mounting slot. This causes the effective length of the plate to be shortened.

Abstract: A method for mounting a printing plate on a mounting sheet without requiring the intervention of a skilled person working by eye. An original design to be printed is produced on a computer and register marks are added to that design at specific positions. The resultant design data is output to a first printer. A negative of the design and the register marks is produced, and a printing plate is produced from the negative so that the design and the register marks are reproduced on the printing plate. The register mark position data is also output from the computer to a second printer. The dimensions of an article upon which the design is to be printed are input into a second printer and a full size plot of the outline of the article, including the positions of the register marks, is produced from the second printer.

Abstract: The method includes loading a printed circuit board (PCB) to a printing machine; aligning a stencil to the PCB when the PCB has been loaded to the printing machine; setting a snap-off distance; dispensing a volume of solder paste onto the stencil, the volume of solder paste being dispensed onto the stencil regardless of whether the PCB has been loaded to the printing machine; placing a squeegee in contact with the stencil at a predetermined pressure; moving the squeegee across the stencil at a predetermined speed; waiting a constant period of time; and repeating.

Abstract: A process and a device for register-correct positioning of printing form sleeves on printing cylinders of a rotary printing machine, each with a pressure gas cushion producible for shifting the elastically expandable printing form sleeve on the printing form cylinder. In order to provide quick register-correct positioning of the printing form sleeves without placing particular demands on the operating personnel, the positions of the printing form sleeves fitting tightly onto the printing cylinders are determined and then the printing form sleeves are individually set and released using the pressure gas cushion of the particular printing cylinder. Then the printing cylinder is turned relative to the printing form sleeve by its angular deviation relative to the register-correct position to be realized. Subsequently the printing form sleeve is again released as well as set relative to the printing cylinder by turning off of the pressure gas cushion.

Abstract: A printing method and apparatus for printing different indicia, such as account numbers, on selected documents without changing plates or stopping the press during a press run. Different indicia are provided at two or more lines on a printing plate, each line being separated from an adjacent line on the plate by a predetermined distance relative to movement of the plate in a press. The plate transfers images to a blanket having a region that does not contact the plate and thus receives no image of the plate area that registers with the noncontacting region of the blanket. The plate and blanket initially are aligned so that the noncontacting region registers with one set of indicia on the plate, so that the blanket receives a partial inked image lacking that indicia. That partial inked image is transferred to sheets passing through the press.

Abstract: Computer controlled numbering of consecutive business forms is provided for both computer controlled presses and in the form of a retrofit unit for conventional rotary presses. The retrofit unit includes a disk provided with radially oriented metallic strips of predetermined locations on the disk, and mounted on a suitable shaft of the press. The disk cooperates with a stationary transducer mounted, for example, on a stationary press wall to send signals to the control unit to fire the printer.

Abstract: A method of registering press plates on plate cylinders used in a sheet-fed press for multicolor printing, in which register information is obtained by using edges of the press plates as references. Each press plate is stretched around a plate cylinder with its front edge and one side edge abutted against gripping references on the plate cylinder. A press plate register measuring device similarly uses the edges of the press plate as references, with the press plate in the same positional relationship as on the press cylinder. On the measuring device deviations between references marks on the plates and benchmark references are measured and utilized to adjust the position of the plate cylinders to bring the printing plates into registered printing positions.

Abstract: A tape is controlled in a printing machine by advancing a length of tape through a light pathway. Transmittance of the light through the tape is measured and values are stored associated with transmittances through the tape. The tape is advanced to a start position where measured transmittance of the tape at the start position corresponds with a stored value of a measured transmittance.

Abstract: A method for accurately drilling pin register holes in flexible printing plates for flexographic printing plate cylinders includes placing aligning pin hole location marks as a part of original artwork used for creating the printing plates. The pin hole location marks are then carried through with each step of developing the flexible plates, including creation of photographic negatives and final type flex negatives from which raised patterns are produced in the finished plates. Pin register holes are then drilled through the finished plate at the marker locations which form a portion of the raised pattern. To align the finished plate on a press, a removable pin register bar is then attached to the plate cylinder, the flexible plate with the register holes drilled therein is placed over the register pins on the bar, the plate is adhered to the plate cylinder in proper printing position and the bar is then removed.

Abstract: A printing apparatus employs a rotatable cam having an enclosed cam slot for controlling the rocking motion of an inking roll without the need for a cam follower spring. The apparatus also includes an articulated printing member support assembly which executes a complex curvilinear movement under the control of a fixed cam slot without the use of linear bearings. Complementary cam profiles are used on both cam surfaces in order to maintain tangency between the inking roll and printing element during inking. A yieldable connecting link is used to prevent excessive printing pressures from being applied, and a movable filler plate closes off a slot in a front cover of the printing apparatus through which a portion of the movable printing member protrudes.

Abstract: Device for compensating for deviations in register in a printed product produced in a sheet-fed rotary printing press having a plurality of printing units includes at least one opto-electrical sensor device for detecting measured values from at least two image regions of a printed product; a computer/control device connected to the sensor device for receiving therefrom data regarding the measured values, for ascertaining from the data deviations in register between color separations caused by shrunken and/or swollen printing transferred to the printed product in the respective printing units, and for determining corresponding compensating adjustment data; and adjusting devices connected to the computer/control device for compensating for the deviations in register between the color separations in accordance with the determined adjustment data of the computation/control device; and method of compensating.

Abstract: A thermal printing method is performed by sublimating an ink film using the heat of a thermal print head with a printing paper being supplied to a rotating drum for transferring. Printing paper is sensed by a sensor for sensing the leading edge thereof, and an image is printed on the printing paper from its leading edge in accordance with the sensed result, so as to print on the printing paper without margins.

Abstract: A device (10) and a method for positioning a rotatable printing cylinder (16) for a printing press (12). A drive (24) can rotate the cylinder (16) about a cylinder axis (52) at relatively high and low speeds. A sensor (68) is positioned adjacent to the cylinder (16) for detecting rotational positions of the cylinder (16) and providing a signal which varies in response to detected rotational positions of the cylinder (16). A sensor exciting target (66) has first and second edges (74 and 76) at first and second ends, respectively, of a sector of the cylinder (16). The sensor (68) is aligned with the first edge (74) at a first rotational position of the cylinder (16) and is aligned with the second edge (76) at a second rotational position of the cylinder (16).

Abstract: In card printing, to allow registration and positioning of card-like originals C when making a master plate by duplication to be accomplished both easily and accurately, the card-like originals are positioned and set up on an original positioning holder for card printing 30 having original set up position designating marks 34 and registration marks 36, according to the original set up position designating marks 34, and a printing master plate is made from the card-like originals along with the original positioning holder for card printing 30 by duplication.

Abstract: An electrographic label system is disclosed whereby flexographic and electronic printing are combined in a modular design to produce multi-color labels. Label stock is unwound from a roll and passes over an automatic shut off roller that shuts down the entire printing process and stops the flow of label stock when it runs out so that a new roll of stock can be sliced to the old roll and rethreading the system is not necessary. A back slitter having a roller cutter cuts the desired height of the label leaving a feed strip between the label and opposite edge. The label stock is fed into a flexographic printer having a drum which imprints a first image, cuts the label to the correct length, and imprints a register mark on the feed strip. The label stock material is next fed into an electronic printer interfaced with a computer or programmable logic controller which imprints a second image upon each label.

Abstract: Method of performing worksteps in a cylinder of a printing press to which an operating medium is supplied includes energizing with the operating medium at least one actuator for performing the worksteps so that the one actuator acts against operating elements energized by spring force, associating with each of the worksteps a respective defined spring-force energization and a respective pressure stage of the operating medium overcoming the respective spring force, and performing the worksteps in a sequence corresponding to a sequence of association of the pressure stages with the worksteps, in stages towards higher pressures and towards lower pressures, respectively; and device for performing the method.

Abstract: A sensor system utilized with a screen printing press for selectively adjusting a length and relative position of the front and rear ends of a printing stroke to traverse a variably sized and positioned image area being applied to a substrate. The sensor system includes fixed reference sensors mounted on the printing press for detecting the position of the front and rear ends of the printing stroke and indicating a distance along which the carriage travels. The sensor system permits the stroke length and the relative position of the printing stroke proximate the image area to be readily adjusted by varying the position of the carriage and monitoring the stroke length of the printing stroke between the front and rear positions.

Abstract: An image transfer apparatus which has a platen to which an image-forming material is to be attached and a transfer cylinder 1 to which an image receptor is to be attached. The apparatus is for transferring an image formed in a photosensitive layer of an image-forming material to an image receptor by the introduction of the image-forming material and the image receptor into a nip formed by the platen and the transfer cylinder. The apparatus has an image receptor attaching device comprising a device for holding the top end side of the image receptor on a transfer cylinder surface along the entire width of the image receptor and a device for holding the bottom end side of the image receptor on a transfer cylinder surface along the entire width of the image receptor. The device for holding the bottom end side comprises a holder and a holder seat for holding the image receptor, provided in a partial cut-off portion of a surface of the transfer cylinder and in an axial-length direction of the transfer cylinder.

Abstract: The accurate registering and mounting of flexible printing plates on a forme cylinder is accomplished by mounting a printing plate to be brought into proper registration on a support which is adjustable in three degrees of freedom and by then superimposing the supported printing plate with a properly registered transparent proof. The plate is brought into proper registration by adjustment of the support using the proof as a reference. The now registered plate is carried by the support to a position where it can be applied to the forme cylinder. A computer may be used to aid in effecting proper register of the plate with reference to the transparent proof.

Abstract: A control system (14) for a printing press (12) having a printing cylinder (36a-36d) having an outer surface, a device (90) for determining a reference printing image for the outer surface of the cylinder (36a-36d), and a device (90) for modifying the reference printing image to a subsequent printing image, and a device (90, 45, 46, 48, and 50) for forming the subsequent printing image on the outer surface of the cylinder (36a-36d).

Abstract: A method and a device for automatically starting and stopping a sheet-turning operation during the transport of sheets through a printing press for facilitating changeover of transport drums between two printing units from single side or recto-printing mode to a perfector or recto-and-verso printing mode.

Abstract: In card printing, to allow registration and positioning of card-like originals C when making a master plate by duplication to be accomplished both easily and accurately, the card-like originals are positioned and set up on an original positioning holder for card printing 30 having original set up position designating marks 34 and registration marks according to the original set up position designating marks 34, and a printing master plate is made from the card-like originals along with the original positioning holder for card printing 30 by duplication.

Abstract: A method and apparatus for the registered application of printing plates to a printing cylinder applies the printing plates to the jacket face of the printing cylinder exactly registered and free of bubbles and warping. The printing plate is clamped in a frictionally connected manner in a stretched position by holding arms and is exactly registered in a horizontal and vertical set position. The plate is then aligned and spaced apart from the printing cylinder and is maintained in a frictionally connected manner. Subsequently, the printing plate is brought into line contact with the jacket and is then pressed against it. The printing plate is pressed down against the cylinder jacket, starting at the contact line, and the pressing force is then applied to the plate circumferentially around the cylinder from the initial contact line.

Abstract: A printing machine having a plurality of printing units, and circumferential and side register adjusting devices for adjusting the register in all but one of the printing units, the one printing unit being non-adjustable, includes a control-command input device operatively associated with the non-adjustable one printing unit for producing a relative change in position of a subject in the non-adjustable one printing of a register adjustment of the one printing unit as a result of logically consistent register adjustments of the printing units having the circumferential and side register adjusting devices, and method of operation.

Abstract: A plate mounted state confirming apparatus includes reference pins, a transmitting coupler, and a receiving coupler. The reference pins detect contact of an insertion end of a plate inserted in a gripper portion of a plate lockup device provided in a gap formed in an outer circumferential surface of a plate cylinder in an axial direction thereof. The transmitting coupler outputs a detection signal obtained by the reference pins as an electrical signal from a plate cylinder. The receiving coupler receives the electrical signal from the transmitting coupler outside the plate cylinder in a non-contact manner.

Abstract: A printing machine is disclosed in which a sleeve having a tapered side surface is provided movably in an axial direction to a gripper shaft 5 arranged in parallel to a plate cylinder shaft 2. A sleeve member 25 is provided movably in the axial direction of the plate cylinder shaft 2. The sleeve member 25 is connected to the sleeve by a swingable arm. A screw 18 which is brought into contact with the tapered side surface of the sleeve is fixed to a bracket 16 mounted on the gripper shaft 5. Furthermore, a plate 13, a gripper 10 and a front abutment are provided on the gripper shaft 5, the front abutment being moved. An amount of displacement of an image position on the printing plate relative to a regular or normal position is obtained by intersecting two lines 47b and 47c formed at the clamp end portion.

Abstract: Flexographic printing plates are mounted in precise registration on printing press cylinders for multicolor printing using a registration apparatus. In the preferred embodiment, the apparatus has a support on which a cylinder can be locked in fixed axial and circumferential position. A pair of pin holders slide on a bar parallel to the cylinder axis to set registration pins in precise positions relative to the surface of the cylinder. The bar moves toward the cylinder and places the pin bases on the cylinder surface so the plate is registered on the pins and adhered to the cylinder along the plate centerline and then across its back. The pin holders are set from a template that matches the plates. The locked pin holders and cylinder support allow additional plates to be similarly mounted on other cylinders in precisely corresponding positions, from their centerlines, with reduced error.

Abstract: A method for positioning a register mark sensor in a sheet printing machine, wherein a register mark sensor is moved in direction perpendicular to the direction of the movement of the sheet for detecting a register mark arrangement on the sheet, wherein the register mark sensor is moved until it is positioned in a defined scanning position relative to the register mark arrangement, the method of which includes the steps of: placing on the sheet a preliminary register mark, a given known distance A, perpendicular to the direction of the movement of the sheet, from a given register mark line, and after printing at least one sheet, positioning the preliminary mark sensor in relation to the preliminary mark.

Abstract: A method for locally enhancing the contrast of a yellow image, which method comprises providing a yellow image on a white background, said image comprised of yellow areas and white areas, said yellow areas and white areas exhibiting pH levels which differ by at least 0.5 in an aqueous environment, applying to at least a portion of said yellow image a solution of a pH color changing dye which will change color to a color other than yellow when coated on one of said yellow areas or white areas and not change color when coated on the other of said yellow areas or white areas, thereby forming a colored image duplicating the yellow image in areas where the solution has been applied, said colored image having a visually better contrast than said yellow image.

Abstract: A plate lockup device position detecting apparatus for a printing press includes first and second limit switches, and a series circuit. The first limit switch is provided in a gap of a plate cylinder and detects that a leading-side plate lockup device, a position of which is adjustable at least in one of vertical and horizontal directions of a plate, is restored to its origin position. The second limit switch is provided in the gap and detects that a trailing-side plate lockup device, a position of which is adjustable at least in one of the vertical and horizontal directions of the plate, is restored to its origin position. The series circuit detects that the plate lockup devices are restored to their origin positions from a logical product of the detection outputs from the first and second limit switches.

Abstract: A method of driving the impression cylinder receiving carriages into the printing elements of a rotary printing machine whilst executing a simultaneous displacement of all the impression cylinder receiving carriages provided in the printing elements and of all the impression cylinder receiving carriages arranged in a waiting position in front of the printing elements, the displacement movement taking place in a first direction of advance and, for the subsequent driving-in of the impression cylinder receiving carriages, the latter being displaced simultaneously and together with the carriages located in the printing elements in the opposite direction.

Abstract: A method for preventing counterfeiting or theft of sales, bank checks and other important records and documents comprising alphanumeric characters including, the steps of printing different parts of at least come of the characters in a predetermined sequence of colors, dyes or other materials from a printing ribbon on which the segments or color are serially or alternatively deposited in a predetermined sequence of segments. Additionally, the method and apparatus for fabricating a multi-colored printing ribbon by depositing spaced segments of a first color at a first color depositing station and then inserting segments of a second color between said segments of said first color at a second color depositing station. By providing multiple color applying regions at each station carefully controlled color segments are produced on the printing ribbon. Means are provided to adjust segment spacing, the amount of coloring material deposited and the timing of the overall device.

Abstract: The present invention belongs to the technical field of synchronously controlling the phase relationship between a plurality of printing rolls in a corrugated board printing press. The object of this invention is to realize synchronous phase control at low cost and with high precision by software. In this invention, a speed command inputted is converted to a digital value at regular intervals to integrate the digital value, the revolution speed of each of the printing rolls is also integrated, and any deviation between these integrated values is subjected to PI operation, thereby separately correcting the revolution speed commands given to drive motors on the basis of their corresponding results of the PI operation. At this time, when the results of the operation in the course of the integrating the speed command and the individual printing rolls exceed the highest value, their values separately return to 0 to continue the operation.