摘要:
A color control system for use in a printing press is provided. The system includes a controller for reviewing digital data for a print job and identifying solid color regions of the print job that are greater than a predetermined size, a user interface allowing an operator to select solid color regions identified by the controller, a sensor for measuring a characteristic of the selected solid color regions of the print job on a printed substrate, the controller determining measured values of the characteristic for each of the selected solid color regions, and at least one inking unit for supplying ink in a plurality of ink zones to a plate cylinder, the controller varying the ink supplied to ink zones including the solid color regions as function of a difference between the measured value of the characteristic of each selected solid color region and a predetermined target value of the characteristic. A method for controlling printing of a printing press is also provided.
摘要:
A system and method are provided for controlling a printing press including a plurality of print units and, optionally, a folder. Each print unit has one or more cylinders, a motor for driving the cylinders; an encoder for providing a cylinder position signal, a controller coupled to the encoder, the motor, a bus which interconnects each of the controllers and an input port for designating the controller as either master or slave. Any one of the controllers is selectively set as a master controller and the remaining controllers are set as slave controllers. The master controller generates a control signal based on a signal from the input port and outputs the control signal to the motor via the output port and to the slave controllers via the bus. Each of the slave controllers outputs a signal on the respective output port based on the received control signal.
摘要:
A printing press folder is provided. The printing press folder includes a cutting apparatus cutting a moving web to form successive signatures, a first acceleration cylinder and a second acceleration cylinder. The first acceleration cylinder includes a first contacting segment and a first relieved portion circumferentially adjacent to the first contacting segment. The second acceleration cylinder includes a second contacting segment and a second relieved portion circumferentially adjacent to the second contacting segment. The first acceleration cylinder and the second acceleration cylinder grip the web at a gripping location with the first contacting segment and the second contacting segment as the web is cut by the cutting apparatus.
摘要:
Method and apparatuses for measuring and regulating the strain of a material web is disclosed. A material web is passed through a first and second non-slip roller pair. The first and second roller pair form a predefined span. In some embodiments, the angular positions of the first and second roller pair are monitored, and the phase angle between the roller pairs is calculated. The phase angle is directly related to the level of strain in the web, and the velocity of the web is controlled to maintain a phase angle which corresponds with the desired strain level. This maintains a constant strain level in the predefined span. In one embodiment, the strain entering a non-slip roll pair is controlled to be zero. The roll pair then introduces a predefined strain to the span entering subsequent processes.
摘要:
A printing press folder is provided. The printing press folder includes a pair of cutting cylinders cutting a web at a cutting location to form signatures, a pair of transport cylinders positively gripping and transporting the signatures and a pair of acceleration cylinders positively gripping and transporting the signatures. The transport cylinders define a first nip and the first nip and the cutting location are separated by a first distance that is slightly shorter than a length of each of the signatures. The acceleration cylinders define a second nip. The pair of transport cylinders receives and releases signatures at a first velocity and the pair of acceleration cylinders receives the signatures from the pair of transport cylinders and releases the signatures at a second velocity that is greater than the first velocity. The first nip and the second nip are separated by a distance that is slightly shorter than the length of each of the signatures, such that the transport cylinders release each of the signatures as the acceleration cylinders grip the respective signature and the transport and acceleration cylinders maintain positive control over the signatures during transport. A signature transport apparatus and a method for transporting printed products in a printing press folder are also provided.
摘要:
A signature transport device is provided. The signature transport device includes a first conveyor moving a stream of folded signatures in a first direction, a rotary arm having a gripper, the gripper gripping a folded signature from the stream by a fold, the rotary arm moving the folded signature in a second direction, a toothed drum engaging a portion of the folded signature, the rotary arm rotating past the toothed drum to open the folded signature and a second conveyor receiving the opened signature from the gripper as the rotary arm continues to rotate. A method is also provided.
摘要:
A noncontact web stabilizer is provided in which members located on opposite sides of a web reduce out-of-plane web vibrations. Specifically, a first member is located on one side of a web and a second member is located on the opposite side of the web. Both members are positioned so that the distance between the web and the members decrease in the direction that the web is moving, creating opposing regions of high pressure that force the web toward its nominal running position, thereby reducing out-of-plane web instability.
摘要:
A diverter for receiving printed products in a single stream and diverting the printed products into a plurality of streams is provided. The diverter includes a first rotating body rotating about a first axis and including first, second and third circumferential sections positioned around the first axis. Each circumferential section of the first rotating body extends radially a different distance from the first axis. The diverter also includes a second rotating body rotating about a second axis and including first, second and third circumferential sections positioned around the second axis. Each circumferential section of the second rotating body extends radially a different distance from the second axis. The first and second rotating bodies divert the printed products into three separate streams at a diverting area between the first and second axes. The diverter also includes a steeple positioned downstream of the diverting area. A method for diverting printed products in a folder, a printing press, a method for adjusting a diverter and a steeple for a diverter are also provided.
摘要:
A broadsheet newspaper printing press has at least one print unit printing at least one web of material and a folder. The folder has a cross-cutter to cut the web of material into broadsheet newspapers, a tucker cylinder having a gripper gripping the broadsheet newspapers at a lead edge and a tucking blade for forming a cross-fold in the broadsheet newspapers, and a jaw cylinder or fold rollers to receive the cross-folded broadsheet newspapers from the tucker cylinder at the cross-fold, the gripper being located with respect to the tucking blade so that the cross-fold is located at between 33% and 45% or 55% and 67% of the height of the newspaper.
摘要:
A diverter for receiving printed products in a single stream and diverting the printed products into a plurality of streams is provided. The diverter includes a first rotating body rotating about a first axis and including first, second and third circumferential sections positioned around the first axis. Each circumferential section of the first rotating body extends radially a different distance from the first axis. The diverter also includes a second rotating body rotating about a second axis and including first, second and third circumferential sections positioned around the second axis. Each circumferential section of the second rotating body extends radially a different distance from the second axis. The first and second rotating bodies divert the printed products into three separate streams at a diverting area between the first and second axes. The diverter also includes a steeple positioned downstream of the diverting area. A method for diverting printed products in a folder, a printing press, a method for adjusting a diverter and a steeple for a diverter are also provided.