Offset press time relationship and its adjustment (Part 2)

3. Time relationship of paper delivery device

The function of the paper delivery device is to transfer the statically positioned paper to the roller bite. The main handover relationship is: the delivery of the delivery tooth at the front rule, the delivery of the delivery tooth and the roller bite.

Handover relationship of paper-handed tooth in the front rule

① Requirements for positional relationship: The height of the top-swinging paper pads is the same and the thickness of the paper is + 0.3mm from the tooth table. The dental tablets are lower than the dental table, and the dental tablets do not touch the dental table. The height of the bottom-heavy delivery tooth pads should be the same and the same as the dental table. The dental pad is neither higher than the dental table nor lower than the dental table. The gap between the top stop board and the dental table is + 0.3mm thick. The position allows the delivery teeth to bite the paper 5-6mm. ② Time relationship requirements: The delivery tooth should bite the paper at rest (the principle of static to static paper receiving). After biting, the pull rule should allow the paper, and the pull rule allows the paper (after 3 ° -5 °). Paper, the current regulation paper (5 ° -8 °), the paper delivery teeth should be fed away (paper delivery), the transfer relationship between the delivery teeth and the roller bite (the same relationship between the roller bite) : At the handover point, the distance between the delivery tooth pad and the surface of the drum is paper thickness + 0.3mm, and the distance between the delivery tooth piece and the edge of the drum is 1mm, that is, the tooth piece does not touch the drum; Up (cutting point is the closest point between the delivery tooth pad and the surface of the roller); around the cutting point, the delivery tooth and the roller biting tooth should bite the paper together and walk 3-5mm.

3. Adjustment of time relationship

1. Sequence characteristics of adjustment of handover relationship

It is necessary to pay attention to the order of adjusting the handover relationship of parts, which part should be adjusted first, and which part should be adjusted later, otherwise it will be difficult to adjust the handover relationship, and will even further mess up the handover relationship. The adjustment sequence of the transfer relationship is generally consistent with the machine transmission sequence, that is, the power input stage parts are adjusted first, and then the power output stage parts are adjusted. During the adjustment, the output stage parts should be adjusted based on the input stage parts, and must not be adjusted. Then change the relationship between the adjusted position and time of the input stage mechanism.

2. Adjustment sequence of main handover relationship of offset press
The main handover relationship of the offset press refers to the handover relationship between the reference roller and the paper delivery tooth, the paper delivery tooth and the front gauge, the paper delivery tooth and the tooth table, the paper delivery tooth and the pull gauge, the front rule and the paper conveying device, and the adjustment sequence It is as follows: ①Adjust the closing time of the bite teeth of the reference roller; ②Adjust the tooth opening time of the delivery tooth at the interface with the roller; ③Adjust the delivery time and tooth closing time of the delivery tooth at the front gauge; ④Adjust The height of the tooth table; ⑤Adjust the height and position of the front gauge; ⑥Adjust the time of the front gauge to make the paper; ⑦Adjust the time of the pulling gauge to make the paper; ⑧Adjust the action time of the paper feeding device.

3. Common methods of time relationship adjustment

The general method of time adjustment: â‘  Most of the action time of the machine is adjusted by changing the position of the control cam. This adjustment method is as follows: hand crank the machine to the specified degree, then loosen the control cam fixing screw to let the control cam (open the teeth) Plate) and the roller (opening ball) lightly contact and fix the cam; â‘¡ Some machine parts are adjusted by changing the circumferential position of the transmission gear. This adjustment method is as follows: first hand shake the machine to the specified position, Then watch whether the time scale meets the requirements. If it does not meet the requirements, loosen the fixing screws (for adjusting the time) on the gears, and then hand shake the machine (note that the adjusted parts cannot move) to the specified scale and tighten the screws.

How to determine the intersection point of the roller teeth and paper delivery teeth: when the machine is old and aging, the relationship between the machine scale and the time is not necessarily correct and reliable, how to determine the cut point? We know that the cutting point is the closest point between the tooth pad and the surface of the roller, so the feeler can be tested to determine the cutting point. Generally, the offset time is set to the zero point of the whole machine, so the zero should be corrected after the cutting point is found. Scale, and then you can adjust the time relationship of other parts according to the time relationship table of the manual.

Method for adjusting the relationship between the paper conveying device and the front gauge time: when the machine installation or feeder repair causes the transfer time between the paper conveying device and the front gauge to be very different, the following method can be used to quickly adjust the relationship between the handover time: Air pump, and then point the machine to let Feida feed the paper at a slow speed. When the paper is fed to 6-10mm from the previous specified position, stop the jog, loosen the time adjustment screw, and then point the machine. When the current gauge has just reached the positioning position, stop the jog , Install the time adjustment fixing screw, and then point the machine to see if the paper is suitable. If it is not suitable, fine-tune it again.

4. J2205, J2108 offset press time relationship adjustment example

The adjustment sequence is as follows: (1) Adjust the roller teeth and paper delivery teeth so that their opening angles are consistent and the bite force is consistent; Backscrew, let the docking duration equal to 27 ° (25 ° -30 ° is acceptable). (3) Test the duration of pulling the paper by shaking the machine, adjust the axial position of the groove cam (or fine-adjust the roller eccentric shaft) to make the pulling time equal to 40 °. ⑷The shaker detects the paper stop time of the front gauge (the difference between the time when the front rule has just reached the positioning position and the paper time of the front rule), and adjusts the double nuts on the connecting rod to make the paper stop time equal to 85 °. ⑸Determine the zero point of the whole machine: use a feeler gauge to determine and calibrate the dial, and then adjust the tooth opening plate to let the roller bite the paper and close the teeth. ⑹ Shake the machine to zero degree, adjust the gap between the surface of the transfer tooth pad and the impression cylinder to the paper thickness + 0.3mm (first flatten the tooth pad to make the base consistent). ⑺Shake the machine to 359 °, let the delivery paper teeth open. ⑻Shake the machine to 77 °, let the delivery paper teeth close. ⑼ Shake the machine to 74 °, let the front rule make the paper. ⑽ Shake the machine to 76 °, adjust the time of the pull gear transmission gear to let it put paper. ⑾Feder feed paper to the pre-regulation time, let it be equal to 148 °. ⑿ Shake the machine to 90 ° to close the chain teeth. ⒀Shake the machine to 88 ° to let the big teeth open their teeth. ⒁ Adjust at other times.

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