Relationship between handover and time
Paper from the fly to the delivery table to go through a series of transfer transfer process, the transfer relationship refers to the paper from one machine to another machine when the time and location of the relationship, the time relationship is also called mobility, refers to the movement of the Relative positional relationship between movements, so the time relationship is generally represented by an angle, a working cycle is defined as 360 °. In order to measure the time relationship with the recording mechanism, a 360° scale disc is generally used to fix the end of the reference drum on the offset press. For example: J2108, J2205 impression cylinder, multi-color machine is usually equipped with a dial on the end face of the first contact roller.
In the offset printing press, there are certain time relations among the moving parts from the same power source. Many of the moving parts of the machine are not adjustable. Only a few parts can be adjusted, and the adjustable main parts are adjustable. There are: teeth opening and closing teeth time, paper delivery device delivery time, the former regulatory action time, side gauge action time, Feida action time.
The time relationship is one of the important contents of the offset printing press. The most serious time-related relationship causes the parts to conflict, collide or even damage the parts. The time relationship is mainly related to paper positioning, feeder feeding, and the normal transfer of paper between teeth. The common problems caused by improper time relations are: overprinting, ghosting, bad edges, falling paper, feeder failure, etc. Therefore, it is of great significance to correctly use and adjust the relationship between offset printing presses.
Major time relationships and requirements
1, Feida time relationship
The relationship between feeder and time is mainly related to the timing relationship between the presser foot and the separation nozzle, the relationship between the separation nozzle and the delivery nozzle, the relationship between the delivery nozzle and the front stopper, and the feeding nozzle and the guide roller timing. Relationships, among them, only the action time of the front paper stopper and the guide wheel is adjustable, and other parts movement time is not adjustable.
Feida main parts movement time requirements are as follows: 1 loose paper blowing mouth stops blowing, the paper suction nozzle should be moved to the lowest point and start inhaling. 2 The presser foot can be pressed down when the pick-up nozzle is moved up to the highest point. The 3-minute paper suction nozzle and the delivery paper suction nozzle should be able to draw paper together (2° to 5°). After the 4-point suction nozzle stops suction (should be over 2°), the delivery nozzle can deliver the paper. 5 The paper feed nozzle can only feed paper when the paper stopper is swinging forward, and the paper stopper should be reset before the presser foot is allowed to hold the paper. 6 The paper guide roller can hold the paper after the paper feed nozzle is pressed. When the machine is aged and the paper feed speed is less than the feed speed of the paper guide roller, the paper feed nozzle should first release the paper, and then the paper guide roller can take the paper.
Feida's main time-related issues are the following: 1 The presser foot often steps on paper and creates a blank sheet failure. When the suction value of the paper suction nozzle is too small, the paper separation nozzle is too high from the paper surface or the presser foot presses too early, and the paper foot phenomenon that the presser foot steps on the paper dispensing nozzle may occur, and as a result, empty sheets often occur. If you find that the presser foot pressure is too early, you can slow down the presser foot press time, generally about 5 ° slower can greatly improve the reliability of paper separation. However, it should be ensured that the presser foot allows the paper time before the paper is sucked by the paper separator. The presser foot control cam is connected with the rotating shaft by a pin. To adjust, the cam is to be removed and the rotating shaft is re-aligned with the positioning pin hole, or the set screw is used. fixed. 2 Distributing air valve air groove is blocked by paper dust and paper hair, which causes the suction time to change and the paper feeding nozzle does not absorb paper, but when the paper feed nozzle has been discharged or the paper is delivered by the delivery nozzle, the paper dispensing nozzle has not been released. Paper phenomenon. Generally remove the distribution valve after cleaning can be resolved. 3 The guide roller or stopper and other parts are not suitable for the operation time. Adjust the guide roller or the stopper to adjust the operation time. It is relatively easy to implement. 4J2108 and other North offset printing machine loose paper blowing mouth in the suction nozzle paper suction has not yet stopped blowing often cause the paper to blow or blow down the suction phenomenon of paper and produce empty, double sheet failure. Improve gas valve solution. In addition, there are other problems with poor timeliness. This is the main reason for the instability of Northren offset presses.
2, positioning device time relationship
The function of the fixing device is to stop the paper sent from the paper feeding device and accurately position it. The time relationship of the positioning device directly affects the positioning performance of the paper, and has important significance for the Zhang and Zhang overprinting. The main time relations are: the paper's circumferential positioning time (t week), the paper's axis positioning time (t-axis) t week = ∣t before-t ∣ t is before the rule is just the time to the paper position, t pull just pull pull time.
T axis = ∣t pull -t let ∣t let pull gauge just let the paper time t generally be more than 40 ° week to ensure good paper circumferential positioning, overprinting accuracy, t axis should be greater than 40 ° to ensure that the paper axial positioning Accurate overprinting. However, with the increase of printing speed, the absolute positioning time of t-axis and t-axis is relatively reduced, and the positioning performance of paper will be reduced. Occasionally, inaccuracy of the gauge will occur.
Positioning device time relationship FAQ: 1t axis is too large, t week is too small, even the paper just came to the front gauge, pull gauge began to pull the paper phenomenon, naturally, such a rule will be very poor, the solution is generally adjusted pull gauge Pull the paper's duration (t axis) and the pull gauge just let the paper time (t let) first adjust the t-axis = 40°, and then adjust t let = hand-off time. 2 Paper is not suitable for the time before the gauge. General requirements When the front gauge has just reached the paper positioning position, the paper should be 6mm to 10mm away from the front gauge (previously tilted front gauge). If it is too early, the paper tends to overshoot, which often leads to overprinting of the paper. If it is too late, the paper Insufficient positioning time in the circumferential direction, it is easy to produce incomplete paper overprinting. The solution usually regulates the transfer time between the former gauge and feeder.
3, the transfer device time relationship
1 Positional relationship requirements: The height of the upper oscillating paper pad is the same and the thickness is +0.3mm from the tooth platen. The tooth chip is lower than the tooth plate and the tooth chip does not touch the tooth plate. The height of the hem-handling tooth pad should be the same and the same with the tooth table. The tooth pad is not higher than the tooth table and not lower than the tooth table. The gap between the front guide paper and the table is +0.3 mm. The position allows the delivery paper to bite paper 5-6mm. 2 Time requirement: The paper handing teeth should bite the paper in the static state (static to the principle of the static contact paper). After the paper bite, the pull gauge should allow the paper, and the pull gauge should let the paper (3°~5°) after Paper, the current regulation paper (5 ° ~ 8 °) after the delivery of paper should be sent to the paper (delivery paper) delivery of paper teeth and roller teeth bite the transfer of the relationship (the transfer of the same relationship between the roller biting paper) 1 position requirements : At the point of delivery, the distance between the paper handing pad and the drum surface is +0.3 mm paper thickness, and the distance between the paper handing tooth piece and the drum lip is 1 mm, ie, the tooth chip does not touch the drum; 2 Time requirement: The junction point is at the cut point Upper (cut point is the closest point between the paper pad and the surface of the drum); around the cut point, the paper handing teeth and the drum bite should bite paper together and feed 3 mm to 5 mm.
The role of the transfer device is to transfer the stationary positioning paper to the roller bite paper teeth. The main transfer relationship is: the transfer of the transfer paper at the front gauge, and the transfer of the transfer paper teeth to the roller bite paper teeth.
Handover of the paper teeth at the front gauge
1, the order characteristics of the transfer relationship adjustment
The adjustment mechanism must pay attention to the order of handover, which mechanism should be adjusted first, and which mechanism should be known afterwards. Otherwise, it will not adjust the handover relationship, and even further disrupt the handover relationship. The adjustment sequence of the transfer relationship is generally consistent with the machine drive sequence, ie, the power input stage components are adjusted first, and the power output stage components are adjusted later. In the adjustment, the output stage components should be adjusted based on the input stage components, and no Then change the adjusted position and time relationship of the input stage components.
2. Offset transfer order of major offset presses
The main transfer relations of the offset press refer to the reference roller and the transfer paper, the transfer paper and the front gauge, the transfer paper and the tooth table, the transfer teeth and the pull gauge, and the transfer between the front gauge and the feeder. As follows: 1 adjust the reference drum biting teeth closed teeth time; 2 adjust the delivery teeth and the roller at the junction of the teeth at the time; 3 adjust the delivery paper at the front gauge at the paper delivery time and closed time; 4 adjustment Table height; 5 adjust the height and position of the front gauge; 6 adjust the timing before the paper; 7 adjust the pull gauge to allow paper time; 8 adjust the operation time of the paper feeder.
3, the commonly used method of time adjustment
Time adjustment General methods: 1 Adjust the movement time of the parts Mostly achieved by changing the position of the control cam, this adjustment method is as follows: Hand crank the machine to a specified degree, then release the control cam fixing screw, let the control cam (open teeth) Board) with the roller (open ball) after the slight contact with the fixed cam can be; 2 some parts of the time adjustment is achieved by changing the transmission gear circumferential position, this adjustment method is as follows: Hand crank the machine to the designated position, Then watch the time scale meet the requirements, if not meet the requirements, then loosen the fixed screw on the gear (for adjusting the time), and then hand-crank the machine (note that the adjustable part can not move) to the specified scale and tighten the screw.
How to determine the contact point between the roller teeth and the delivery tooth: When the machine is out of date and the relationship between the machine scale and the time is not correct and reliable, how to determine the cut point? We know that the point of cut is the closest point between the paper pad and the drum surface. Therefore, the cut point can be determined by the feeler. Generally, the offset machine sets the cut time as the zero point of the whole machine. Therefore, the zero should be found after finding the cut point. Scale, and then can adjust other parts of the time relationship according to the specification time relation table.
The adjustment method for the relationship between the paper feeding device and the front gauge time: when the machine installation or feeder repair causes the paper feeder to be far away from the timing of the front gauge, the following method can be used to quickly adjust the relationship between the paper handling device and the front gauge: The paper must be opened first. Air pump, then the punctual machine allows Feder to feed the paper slowly. When the paper is transported to the position 6mm~10mm away from the previous specified position, it will stop jogging. Release the time adjustment screw and then point the machine. When the current gauge just reaches the positioning position, it stops the jog. , Put on the time adjustment fixing screw, and then check if the machine is suitable for paper feeding. If it is not suitable, then fine-tune it.
4, J2205, J2108 offset press time adjustment example
The adjustment order is as follows: (1) Adjust the roller's bite and feed teeth so that their corners are consistent and the bite force is consistent; (2) Hand-operated machines detect the start and end time of the paper-feeding mechanism and the patron's stop (roller and cam disconnect start and end time), adjust Rely on the screw and let it stop for 27° (25°-30°). (3) Shake the machine to pull the pull gauge for the duration of the pull, adjust the axial position of the pull gauge groove cam (or fine-tune the roller eccentric shaft) so that the draw duration is equal to 40°. (4) Check the front regulation paper time (the difference between the time when the front gauge just reached the positioning position and the front gauge paper timing) and adjust the double nuts on the connecting rod so that the blocking time is equal to 85°. (5) Determine the zero point of the machine: Measure and confirm with the feeler gauge, and calibrate the dial, then adjust the open tooth plate to make the roller bite the teeth. (6) Shake the machine to zero degree, and adjust the gap between the transfer paper pad and the impression cylinder to a paper thickness of +0.3 mm (the first flat pad will make the base consistent). (7) Shake the machine to 359° so that the paper hand teeth are opened. (8) Turn the machine to 77° to allow the paper to be closed. (9) Shake the machine to 74° and let the front gauge make paper. (10) Turn the machine to 76° and adjust the length of the pull gauge drive gear to allow it to feed. (11) Feida took the paper to the front gauge time and let it equal to 148°. (12) Shake the machine to 90° to allow the chain teeth to close. (13) Shake the machine to 88° to allow the teeth to open. (14) Other time adjustments.
Paper from the fly to the delivery table to go through a series of transfer transfer process, the transfer relationship refers to the paper from one machine to another machine when the time and location of the relationship, the time relationship is also called mobility, refers to the movement of the Relative positional relationship between movements, so the time relationship is generally represented by an angle, a working cycle is defined as 360 °. In order to measure the time relationship with the recording mechanism, a 360° scale disc is generally used to fix the end of the reference drum on the offset press. For example: J2108, J2205 impression cylinder, multi-color machine is usually equipped with a dial on the end face of the first contact roller.
In the offset printing press, there are certain time relations among the moving parts from the same power source. Many of the moving parts of the machine are not adjustable. Only a few parts can be adjusted, and the adjustable main parts are adjustable. There are: teeth opening and closing teeth time, paper delivery device delivery time, the former regulatory action time, side gauge action time, Feida action time.
The time relationship is one of the important contents of the offset printing press. The most serious time-related relationship causes the parts to conflict, collide or even damage the parts. The time relationship is mainly related to paper positioning, feeder feeding, and the normal transfer of paper between teeth. The common problems caused by improper time relations are: overprinting, ghosting, bad edges, falling paper, feeder failure, etc. Therefore, it is of great significance to correctly use and adjust the relationship between offset printing presses.
Major time relationships and requirements
1, Feida time relationship
The relationship between feeder and time is mainly related to the timing relationship between the presser foot and the separation nozzle, the relationship between the separation nozzle and the delivery nozzle, the relationship between the delivery nozzle and the front stopper, and the feeding nozzle and the guide roller timing. Relationships, among them, only the action time of the front paper stopper and the guide wheel is adjustable, and other parts movement time is not adjustable.
Feida main parts movement time requirements are as follows: 1 loose paper blowing mouth stops blowing, the paper suction nozzle should be moved to the lowest point and start inhaling. 2 The presser foot can be pressed down when the pick-up nozzle is moved up to the highest point. The 3-minute paper suction nozzle and the delivery paper suction nozzle should be able to draw paper together (2° to 5°). After the 4-point suction nozzle stops suction (should be over 2°), the delivery nozzle can deliver the paper. 5 The paper feed nozzle can only feed paper when the paper stopper is swinging forward, and the paper stopper should be reset before the presser foot is allowed to hold the paper. 6 The paper guide roller can hold the paper after the paper feed nozzle is pressed. When the machine is aged and the paper feed speed is less than the feed speed of the paper guide roller, the paper feed nozzle should first release the paper, and then the paper guide roller can take the paper.
Feida's main time-related issues are the following: 1 The presser foot often steps on paper and creates a blank sheet failure. When the suction value of the paper suction nozzle is too small, the paper separation nozzle is too high from the paper surface or the presser foot presses too early, and the paper foot phenomenon that the presser foot steps on the paper dispensing nozzle may occur, and as a result, empty sheets often occur. If you find that the presser foot pressure is too early, you can slow down the presser foot press time, generally about 5 ° slower can greatly improve the reliability of paper separation. However, it should be ensured that the presser foot allows the paper time before the paper is sucked by the paper separator. The presser foot control cam is connected with the rotating shaft by a pin. To adjust, the cam is to be removed and the rotating shaft is re-aligned with the positioning pin hole, or the set screw is used. fixed. 2 Distributing air valve air groove is blocked by paper dust and paper hair, which causes the suction time to change and the paper feeding nozzle does not absorb paper, but when the paper feed nozzle has been discharged or the paper is delivered by the delivery nozzle, the paper dispensing nozzle has not been released. Paper phenomenon. Generally remove the distribution valve after cleaning can be resolved. 3 The guide roller or stopper and other parts are not suitable for the operation time. Adjust the guide roller or the stopper to adjust the operation time. It is relatively easy to implement. 4J2108 and other North offset printing machine loose paper blowing mouth in the suction nozzle paper suction has not yet stopped blowing often cause the paper to blow or blow down the suction phenomenon of paper and produce empty, double sheet failure. Improve gas valve solution. In addition, there are other problems with poor timeliness. This is the main reason for the instability of Northren offset presses.
2, positioning device time relationship
The function of the fixing device is to stop the paper sent from the paper feeding device and accurately position it. The time relationship of the positioning device directly affects the positioning performance of the paper, and has important significance for the Zhang and Zhang overprinting. The main time relations are: the paper's circumferential positioning time (t week), the paper's axis positioning time (t-axis) t week = ∣t before-t ∣ t is before the rule is just the time to the paper position, t pull just pull pull time.
T axis = ∣t pull -t let ∣t let pull gauge just let the paper time t generally be more than 40 ° week to ensure good paper circumferential positioning, overprinting accuracy, t axis should be greater than 40 ° to ensure that the paper axial positioning Accurate overprinting. However, with the increase of printing speed, the absolute positioning time of t-axis and t-axis is relatively reduced, and the positioning performance of paper will be reduced. Occasionally, inaccuracy of the gauge will occur.
Positioning device time relationship FAQ: 1t axis is too large, t week is too small, even the paper just came to the front gauge, pull gauge began to pull the paper phenomenon, naturally, such a rule will be very poor, the solution is generally adjusted pull gauge Pull the paper's duration (t axis) and the pull gauge just let the paper time (t let) first adjust the t-axis = 40°, and then adjust t let = hand-off time. 2 Paper is not suitable for the time before the gauge. General requirements When the front gauge has just reached the paper positioning position, the paper should be 6mm to 10mm away from the front gauge (previously tilted front gauge). If it is too early, the paper tends to overshoot, which often leads to overprinting of the paper. If it is too late, the paper Insufficient positioning time in the circumferential direction, it is easy to produce incomplete paper overprinting. The solution usually regulates the transfer time between the former gauge and feeder.
3, the transfer device time relationship
1 Positional relationship requirements: The height of the upper oscillating paper pad is the same and the thickness is +0.3mm from the tooth platen. The tooth chip is lower than the tooth plate and the tooth chip does not touch the tooth plate. The height of the hem-handling tooth pad should be the same and the same with the tooth table. The tooth pad is not higher than the tooth table and not lower than the tooth table. The gap between the front guide paper and the table is +0.3 mm. The position allows the delivery paper to bite paper 5-6mm. 2 Time requirement: The paper handing teeth should bite the paper in the static state (static to the principle of the static contact paper). After the paper bite, the pull gauge should allow the paper, and the pull gauge should let the paper (3°~5°) after Paper, the current regulation paper (5 ° ~ 8 °) after the delivery of paper should be sent to the paper (delivery paper) delivery of paper teeth and roller teeth bite the transfer of the relationship (the transfer of the same relationship between the roller biting paper) 1 position requirements : At the point of delivery, the distance between the paper handing pad and the drum surface is +0.3 mm paper thickness, and the distance between the paper handing tooth piece and the drum lip is 1 mm, ie, the tooth chip does not touch the drum; 2 Time requirement: The junction point is at the cut point Upper (cut point is the closest point between the paper pad and the surface of the drum); around the cut point, the paper handing teeth and the drum bite should bite paper together and feed 3 mm to 5 mm.
The role of the transfer device is to transfer the stationary positioning paper to the roller bite paper teeth. The main transfer relationship is: the transfer of the transfer paper at the front gauge, and the transfer of the transfer paper teeth to the roller bite paper teeth.
Handover of the paper teeth at the front gauge
1, the order characteristics of the transfer relationship adjustment
The adjustment mechanism must pay attention to the order of handover, which mechanism should be adjusted first, and which mechanism should be known afterwards. Otherwise, it will not adjust the handover relationship, and even further disrupt the handover relationship. The adjustment sequence of the transfer relationship is generally consistent with the machine drive sequence, ie, the power input stage components are adjusted first, and the power output stage components are adjusted later. In the adjustment, the output stage components should be adjusted based on the input stage components, and no Then change the adjusted position and time relationship of the input stage components.
2. Offset transfer order of major offset presses
The main transfer relations of the offset press refer to the reference roller and the transfer paper, the transfer paper and the front gauge, the transfer paper and the tooth table, the transfer teeth and the pull gauge, and the transfer between the front gauge and the feeder. As follows: 1 adjust the reference drum biting teeth closed teeth time; 2 adjust the delivery teeth and the roller at the junction of the teeth at the time; 3 adjust the delivery paper at the front gauge at the paper delivery time and closed time; 4 adjustment Table height; 5 adjust the height and position of the front gauge; 6 adjust the timing before the paper; 7 adjust the pull gauge to allow paper time; 8 adjust the operation time of the paper feeder.
3, the commonly used method of time adjustment
Time adjustment General methods: 1 Adjust the movement time of the parts Mostly achieved by changing the position of the control cam, this adjustment method is as follows: Hand crank the machine to a specified degree, then release the control cam fixing screw, let the control cam (open teeth) Board) with the roller (open ball) after the slight contact with the fixed cam can be; 2 some parts of the time adjustment is achieved by changing the transmission gear circumferential position, this adjustment method is as follows: Hand crank the machine to the designated position, Then watch the time scale meet the requirements, if not meet the requirements, then loosen the fixed screw on the gear (for adjusting the time), and then hand-crank the machine (note that the adjustable part can not move) to the specified scale and tighten the screw.
How to determine the contact point between the roller teeth and the delivery tooth: When the machine is out of date and the relationship between the machine scale and the time is not correct and reliable, how to determine the cut point? We know that the point of cut is the closest point between the paper pad and the drum surface. Therefore, the cut point can be determined by the feeler. Generally, the offset machine sets the cut time as the zero point of the whole machine. Therefore, the zero should be found after finding the cut point. Scale, and then can adjust other parts of the time relationship according to the specification time relation table.
The adjustment method for the relationship between the paper feeding device and the front gauge time: when the machine installation or feeder repair causes the paper feeder to be far away from the timing of the front gauge, the following method can be used to quickly adjust the relationship between the paper handling device and the front gauge: The paper must be opened first. Air pump, then the punctual machine allows Feder to feed the paper slowly. When the paper is transported to the position 6mm~10mm away from the previous specified position, it will stop jogging. Release the time adjustment screw and then point the machine. When the current gauge just reaches the positioning position, it stops the jog. , Put on the time adjustment fixing screw, and then check if the machine is suitable for paper feeding. If it is not suitable, then fine-tune it.
4, J2205, J2108 offset press time adjustment example
The adjustment order is as follows: (1) Adjust the roller's bite and feed teeth so that their corners are consistent and the bite force is consistent; (2) Hand-operated machines detect the start and end time of the paper-feeding mechanism and the patron's stop (roller and cam disconnect start and end time), adjust Rely on the screw and let it stop for 27° (25°-30°). (3) Shake the machine to pull the pull gauge for the duration of the pull, adjust the axial position of the pull gauge groove cam (or fine-tune the roller eccentric shaft) so that the draw duration is equal to 40°. (4) Check the front regulation paper time (the difference between the time when the front gauge just reached the positioning position and the front gauge paper timing) and adjust the double nuts on the connecting rod so that the blocking time is equal to 85°. (5) Determine the zero point of the machine: Measure and confirm with the feeler gauge, and calibrate the dial, then adjust the open tooth plate to make the roller bite the teeth. (6) Shake the machine to zero degree, and adjust the gap between the transfer paper pad and the impression cylinder to a paper thickness of +0.3 mm (the first flat pad will make the base consistent). (7) Shake the machine to 359° so that the paper hand teeth are opened. (8) Turn the machine to 77° to allow the paper to be closed. (9) Shake the machine to 74° and let the front gauge make paper. (10) Turn the machine to 76° and adjust the length of the pull gauge drive gear to allow it to feed. (11) Feida took the paper to the front gauge time and let it equal to 148°. (12) Shake the machine to 90° to allow the chain teeth to close. (13) Shake the machine to 88° to allow the teeth to open. (14) Other time adjustments.
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