Paper handover and adjustment of the most printing

The paper handover and adjustment of the printing machine (Part 2)

the handover relationship of the paper delivery tooth at the front gauge ① position relationship requirements: the height of the upward swing paper delivery tooth pad is consistent, and the paper thickness from the tooth table is +0.3mm, the tooth piece is lower than the tooth table, and the tooth piece does not touch the tooth table. The height of the bottom swing paper delivery tooth pad should be consistent and on the same plane with the tooth table. The tooth pad is neither higher nor lower than the tooth table. The gap between the baffle board on the front gauge and the tooth table is +0.3mm thick. The front and rear positions of the front gauge can make the paper delivery tooth bite the paper by mm. ② Time relationship requirements: the paper feeding teeth should bite the paper at rest (static to static paper connection principle), the pull gauge should yield the paper after the paper is bitten, and the front (4) experimental machine will yield the paper after the pull gauge yields the paper (over 3 ° -5 °), and the front (4) experimental machine is connected to the 3-phase 4-wire power supply gauge. After the current gauge yields the paper (5 ° -8 °), the paper feeding teeth should feed the paper (paper delivery) and the connection relationship between the paper feeding teeth and the roller teeth (the connection relationship between the roller teeth is the same) ① position relationship requirements: at the connection point, The distance between the paper feeding tooth pad and the surface of the drum is paper thickness +0.3mm, and the distance between the paper feeding tooth and the edge of the drum is 1mm, that is, the tooth does not touch the drum; ② Time relationship requirements: the junction point is on the tangent point (the tangent point is the closest point between the paper delivery tooth pad and the roller surface); Around the tangent point, the paper feeding teeth and the roller paper biting teeth should bite the paper together and take the paper for 3-5mm

1. The sequence characteristics of the adjustment of the handover relationship

when adjusting the handover relationship of parts, we must pay attention to the sequence. We should know which parts should be adjusted first and which parts should be adjusted after base note. Otherwise, we will not adjust the handover relationship well, and even further confuse the handover relationship. The adjustment sequence of the handover relationship is generally consistent with the machine transmission sequence, that is, the power input level parts are adjusted first, and the power output level parts are adjusted later. During the adjustment, the output level parts should be adjusted based on the input level parts, and it is not allowed to change the good position and time relationship that the input level parts have been adjusted from 10.4% in the first 10 years to 7.6% in the next 10 years

2. Adjustment sequence of the main handover relationship of the offset press

the main handover relationship of the offset press refers to the handover relationship between the reference drum and the paper feeding teeth, the paper feeding teeth and the front gauge, the paper feeding teeth and the drawing gauge, and the front gauge and the paper feeding device. The adjustment sequence is as follows: ① adjust the closing time of the paper biting teeth of the reference drum; ② Adjust the tooth opening time of the paper delivery tooth at the junction with the drum; ③ Adjust the paper delivery time and tooth closing time of the paper delivery teeth receiving paper at the front gauge; ④ Adjust the height of the dental table, which makes the lightweight structure more attractive; ⑤ Adjust the height and position of the front gauge; ⑥ Adjust the paper yield time before; ⑦ Adjust the paper yield time of the draw gauge; ⑧ Adjust the action time of the paper feeding device

3. Common methods of time relationship adjustment

general methods of time adjustment: ① most of the adjustment of the action time of the machine is achieved by changing the position of the control cam. This adjustment method is as follows: manually rotate the machine to the specified degree, then loosen the fixing screw of the control cam, and fix the cam after the control cam (tooth opening plate) slightly contacts the roller (tooth opening ball); ② The time adjustment of some parts is realized by changing the circumferential position of the transmission gear. This adjustment method is as follows: first manually rotate the machine to the specified position, and then watch whether the time scale meets the requirements. If it does not meet the requirements, loosen the fixed screw on the gear (for adjusting the time), and then manually rotate the machine (note that the adjusted parts meet the technical requirements of all the process) to the specified scale and tighten the screw

method for determining the intersection point between the paper biting tooth and the paper delivery tooth of the roller: how to determine the tangent point when the machine is old and aging, and the relationship between the machine scale and time is not necessarily correct and reliable? We know that the tangent point is the closest point between the paper feeding tooth pad and the drum surface, so the tangent point can be determined by feeler gauge test. Generally, offset printing machines set the tangent point time as the zero point of the whole machine, so the scale should be calibrated after finding the tangent point, and then the time relationship of other parts can be adjusted according to the time relationship table in the manual

adjustment method of the time relationship between the paper feeding device and the front gauge: when the handover time between the paper feeding device and the front gauge is very different due to machine installation or Feida repair, the following methods can be used to quickly adjust the handover time relationship: first turn on the paper feeding and air pump, and then on schedule the machine to let Feida slowly feed the paper. When the paper is transported to mm away from the positioning position of the front gauge, stop inching, loosen the time adjustment screw, and then on schedule the machine, Stop inching when the front gauge just reaches the positioning position, install the time adjustment fixing screw, and then move the machine on time to see whether it is appropriate. If not, fine tune it

4, J2205, J2108 offset press time relationship adjustment examples

the adjustment sequence is as follows: ⑴ adjust the drum paper teeth and paper delivery teeth to make their opening angles consistent and the biting force consistent; (2) the hand-operated machine detects the start and end time of the paper delivery mechanism and the back-up stop (the start and end time of the separation of the roller and the cam), and adjust the back-up screw so that the stop duration is equal to 27 ° (25 ° -30 °). (3) shake the machine to test the paper pulling duration of the gauge, and adjust the axial position of the groove cam of the gauge (or fine tune the eccentric shaft of the roller) so that the paper pulling duration is equal to 40 °. (4) shake the machine to detect the paper stop time of the front gauge (the difference between the time when the front gauge just reaches the positioning position and the paper yield time of the front gauge), and adjust the double nuts on the connecting rod so that the paper stop time is equal to 85 °. (5) determine the zero point of the whole machine: measure and determine with a feeler gauge, calibrate the dial, and then adjust the tooth opening plate to make the drum bite the paper teeth and close the teeth. (6) shake the machine to zero, and adjust the surface gap between the paper delivery tooth pad and the impression cylinder to be the paper thickness +0.3mm (first level the tooth pad to make the base consistent). (7) shake the machine to 359 ° and let the paper delivery teeth open. (8) shake the machine to 77 ° and close the paper delivery teeth. (9) shake the machine to 74 °, and let the former rule yield the paper. (10) shake the machine to 76 °, adjust the driving gear time of the puller to let it put paper. (11) Feida takes the paper to the front gauge time, making it equal to 148 °. (12) shake the machine to 90 ° and close the teeth of the chain. ⒀ shake the machine to 88 ° and let big teeth open. (14) other time adjustment

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