subject: There Is This Trick: Sheet-fed Offset Press Gripper Mechanism Of The Regulation - Offset Printing [print this page] Delivery Paper Structure is sheet-fed offset Print The key parts of machines, if properly adjusted there will be no smooth delivery paper tooth movement, Diao paper error, such as defects in different speed, resulting in overprinting not allowed. So accurately regulate the gripper mechanism is essential.
Sheet-fed offset press gripper mechanism is generally eccentric rotary gripper mechanism, the swing cam through the four-bar linkage gripper teeth to swing. Delivery of paper while it installed in the tooth axis eccentricity eccentric kit for the 20mm through Gear Make uniform rotation. Therefore, delivery of paper made tooth movement itself centers around the eccentric center of swing made uniform rotation. Its orbit as a "drop"-shaped closed curve. As a result of rotation eccentric to the time of delivery paper return swing dental center was raised, it can improve the smooth delivery of paper teeth and precision passing. However, due to increase in the eccentricity of the rotation, so that complicated delivery paper tooth movement, but also increased the difficulty of adjustment.
To improve the accuracy of delivery and transfer of the paper, the characteristics of the machine stages of movement, especially the intersection of sports, should have stringent requirements.
Teeth to improve the delivery of paper stability and accuracy Diao paper to avoid the cam machining error, wear and vibration, vibration caused by handing in the slip teeth to require delivery of paper teeth in dental Diao paper closed when at rest. Therefore, delivery of paper when paper teeth in Diao cam roller and the swing should be a relatively quiescent state. Specific regulation is to run to the swing cam when the roller lowest position, the adjustment screw backing, so wheel clearance from the swing cam for the 0.03mm-0.05mm, so delivery paper backing on teeth docked in time for the rotation of impression cylinder 27 corresponding .
High speed because the machine will vibrate, delivery of paper backing on the teeth just docked in Shihai instability, damping need to purchase paper. In addition, regulations have to wait before handing in the slip teeth grabs the paper before transfer to the impression cylinder, here also need a short process. Therefore, the specific speed of Paper exercise time should be allocated more rationally: Delivery of paper backing on the docked teeth, then turned 17 impression cylinder closed teeth Diao paper, paper delivery closed teeth teeth by 5 before the rules after the start elevation , and then by 5 Delivery Paper dental impression cylinder began to transfer paper.
Swing center when handing in the slip teeth in eccentric center and delivery of paper between the mouth of teeth on the vertical line connecting the instantaneous delivery of paper to Taiwan, then Diao mouth upward vertical velocity is 0 points, this time at the moment Diao stationary paper for Diao paper the best time. Adjustment, the machine zero position in the whole premise of the machine running to the exit speed of paper teeth Diao position, when the delivery of paper dental pad of paper from the delivery location of the lowest teeth, control delivery of paper torn off and teeth closed roller mounted on the drive side Delivery of paper teeth teeth opening and closing rotation axis cam, in the Spring Under the action of force, delivery of paper radiograph location just closed in this campaign, Diao paper, the best accuracy. If Diao paper, the dental pad is not in the lowest position, dental pad of paper face is not parallel to the dental delivery table, so that when in the closed gripper teeth film will stir up a little paper Diao mouth, teeth Shihai will close I bent the paper before, this error will cause Diao paper.
Teeth do as delivery speed paper movement, speed, acceleration from zero speed to the impression cylinder surface, while the impression cylinder is made of uniform rotation, therefore, in the delivery stage of handing in the slip of paper placed over dental point of view and impression cylinder is turned a different point of view, so when the delivery of paper teeth to reach the intersection, the delivery of paper tooth axis?? swing center has more than delivered on paper Tooth The center wheel and impression cylinder connection, that is, delivery of paper in the paper sent to the intersection of teeth, the swing center and the delivery of their paper, the center of eccentric gear tooth connection and the eccentric sleeve and the impression cylinder of the central connection an angle of 18 , which is adjusted with the impression cylinder gripper teeth the main basis for the transfer. Delivery of paper before the transfer speed should be larger than the teeth impression cylinder surface speed, the maximum value of about more than impression cylinder surface speed of 10%, and then down to transfer constant velocity.
Teeth and the impression cylinder gripper transfer, in order to ensure accurate transfer paper to ensure the accuracy of the intersection overprint, delivery of paper Diao floss teeth and impression cylinder speed should be equal and opposite. In addition, in the transition process, the paper can not be void, gripper teeth and dental impression cylinder Diao common grabs paper synchronized 2? 5mm, delivery of paper cusp escape impression cylinder-edge ahead of 0.5-1mm, gripper teeth location away from the impression cylinder pad surface minimum 0.3mm, from the delivery table paper teeth 0.3mm.
In addition, the delivery of paper teeth Diao paper shall be not less than 8mm, and Diao paper, the pressure to be consistent, to the same level of dental pad. Way to ensure accurate overlay.
