Fault handling of J2108, J2205 type printing machine side positioning device
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The front and side gauges of the J2108 and J2205 machines are basically the same, so they are introduced together in this article.
The working structure and working principle of the pre-regulation
The 2108 type machine front gauge structure, the front paper stop positioning plate is fixed on the gauge by the screw 19, and the gauge seat is fixed to the front gauge shaft 13 through the retaining ring. The motion of the front gauge is controlled by the cam 1 mounted on the end face (operating surface) of the eccentric bearing transmission gear of the transfer shaft.
The cam 1 swings the swing lever 2 up and down via a roller; the tension spring 3 keeps the roller in contact with the cam. The sliding sleeve 4 passes through the pressure spring 5 and the adjusting nut 6, so that the connecting rod 7 moves up and down with the swinging rod 2. The swing bars 8 and 9 are fixed together and are looped over the front gauge shaft 13. The lower end of the swinging rod 9 has a looper 10 which can be strung back and forth on a connecting rod equipped with a pressure spring 14, and the movement is transmitted to the swinging rod 12 and the front gauge shaft 13 by means of the spring 14 and the adjusting nut 11, the shaft 13 has a row of (4) front paper blocking plates 17, each of which has a fixing screw 16 for fixing the front frame 21 to the shaft 13. When the pendulum 12 is swung, the front gauge is blocked. The positioning plate 17 swings up and down together with the mount 21 via the shaft 13.
When the cam is in contact with the roller at the high point stationary arc, the front gauge is in the position shown in the figure, and the curved surface of the cam is turned from the high point to the low point. The swinging rod 2 hem, the spring 5 and the nut 6 and the connecting rod 7 are downwardly pushed together, the swinging rods 8, 9 are rotated clockwise around the front gauge shaft 13, and the connecting rod 7 is driven by the spring 14 and the nut 11 to be fixed. The frame 21 on the front gauge shaft is lifted clockwise to the paper-retaining position together with the positioning plate 17.
When the cam 1 is moved from the high point to the low point, the swing lever 8 is brought into contact with the positioning pin 22 to block the upper swing motion. At this time, the cam continues to rotate toward the high point, the sliding sleeve 4 on the swinging rod 2 slides on the connecting rod 7, compresses the supporting spring 5, and the front gauge paper positioning plate 17 is stabilized at the stationary position due to the action of the positioning pin 22. Location. Even if there is a machining error on the cam curve surface, the front gauge paper positioning plate can be stabilized, so that the paper can be stabilized on the paper feeding table, and the front specification position is more accurate.
The swing lever 23 is automatically controlled by the roller clutch mechanism. During normal operation, the swing lever 23 is in the position shown, and the front gauge can swing freely. When an empty sheet occurs, the paper is skewed, etc., the circuit is turned on, and the electromagnet swings the swing rod 23 to the left to the top of the looper 10. The swing rod 9 cannot swing, and the front gauge cannot lift the paper, the paper feed table Paper that is not positioned correctly will not be bitten into the drum by the transfer paper. In this case the roller on the pendulum 2 will be out of contact with the cam low point.
The movement time of the front gauge depends on the coupling position of the cam 1 and the eccentric bearing transmission gear of the paper swaying shaft, that is, when the machine is at the position of the "0" point (J2108, the J2205 type machine stipulates that the impression cylinder can bite the teeth and start to bite the paper. For the host "0" point) the "0" line of the cam 1 is in contact with the roller (the position shown in Figure 1). Since the position of the cam has been debugged correctly by the manufacturer, it is fixed with a pin and is generally not adjusted during use. If you find that the front gauge is not correct at the time of overhauling the machine, you can borrow the cam 1.
The most common adjustment of the front gauge is the adjustment of the front and rear and the height of the paper stopper positioning plate. The front and rear adjustment is used to make the printing plate need to be slightly adjusted in the circumferential direction or to pull the printing plate. In this case, the front gauge can be adjusted. Loosen the lock nut 19. When the adjusting screw 18 is turned, the positioning plate 17 can be moved back and forth. After the adjustment, the nut 19 is locked, and the adjustment principle of the front and rear position is as little as possible or less, so as to ensure that the bite distance of the drum biting is equal on both sides.
According to the thickness of the paper, the height of the positioning plate can be properly adjusted. Under normal circumstances, when the front gauge is in the positioning position, the gap between the bottom surface of the curved surface of the positioning plate and the plane of the paper feeding table should be three times the thickness of the printed paper. When adjusting individually, first loosen the screw 16 that fixes the front frame, adjust the height of the front gauge by hand, and then tighten the fixing screw 16 after adjustment. If the overall adjustment can be first loosened the lock nut 24, then the adjustment nut 20 is rotated, the height of the connecting rod 7 is changed, and the front gauge shaft 13 is deflected by an angle to drive the positioning plate to rise or fall. Between the adjusting nut 20 and the sliding sleeve 4, there should be a gap of 0.1 mm in the front predetermined position to ensure that the eccentric shaving shaft 22 abuts against the rod 8. The gap can not be large, too large will increase the positioning time.
The side gauge drive shaft I is provided with a cam 9 and a gear 14 which are coupled to the shaft by flat keys, the position of which on the shaft being controlled by the seat body 17 of the side gauge. The fixed shaft 18 is sleeved with a sleeve seat 19, which can be fixed with the handle 6 of the upper end of the screw after moving along with the entire side gauge, and then the seat body 17 and the fixed shaft 18 of the side gauge are fixed together by the nut 27.
The rotary motion of the paper feed roller is driven by the gear 14 of the gear 14, the gear 15 and the bevel gear 22 are coupled together, so that the bevel gear 22 is also rotated, and the transmission bevel gear 16 causes the pickup roller 1 to obtain a rotational motion.
The up and down swing of the pulling paper ball is performed by the cam 9 rotating the pendulum rod 20 around the fulcrum O via the roller 10, and a pulling paper ball 2 is fixed on the swing arm extending from the swinging rod 20, so the paper ball is pulled along with 20 The swing swings up and down, and the compression spring 21 brings the roller 10 into contact with the cam surface. When the paper is pulled, the compression spring 21 again brings the contact pressure of the pull paper ball and the paper feed roller.
There are four aspects to the adjustment of the side gauge:
1. Adjustment of the side gauge pulling time
After the front gauge has positioned the paper, the side gauges begin to pull the paper. At this point, the paper ball should fall and come into contact with the paper pull roller. There are three ways to adjust the paper pull time.
(1) Both left and right side gauges are adjusted simultaneously:
On the outside of the transmission surface of the transmission shaft I, a flange is mounted on the end of the shaft, and the end surface of the shaft has three screw holes, which are coupled with a transmission gear through three screw holes, and the gear has a long hole to change the gear and The relative position of the circumference of the shaft can change the timing of the side gauge to pull the paper, so that the two rules on the left and right sides are synchronously adjusted.
(2) Thick adjustment of single side gauge: If it is only necessary to change the timing of pulling the paper of one side gauge, the fixing screw on the cam 9 can be loosened, and the relative position of the cam and the circumference of the shaft can be adjusted, so that the pulling time can be made larger. Adjustment.
(3) Fine adjustment of the single side gauge: the roller 10 and the pull-up roller are respectively fixed by the eccentric shafts 11 and 13, and the eccentric position of the eccentric shaft can be adjusted. The fine adjustment is essentially to change the gap between the roller 10 and the cam curve surface after the paper ball falls and contacts the pull roller. If the gap is large, the paper pulling roller will fall early and be lifted late; otherwise, the paper pulling roller will fall late and lift early.
2. Adjusting the working position of the paper positioning plate
When the paper stopper positioning plate is fixed, it is fixed with the swinging rod 20, so it swings up and down at the same time as pulling the paper ball. The baffle is coupled to the screw 23 and sleeved in the sleeve 24, which are fixed by the positioning pin 26 and the adjusting nut 4 and the lock nut 5, and the sleeve 24 is further installed in the hole of the swinging rod 20, The lock nut 3 is locked. By loosening the nut 3, the 4, 23, 5, 26, 24 and 25 fixed to each other can be rotated in the hole of the swinging rod 20, which can adjust the verticality of the flap positioning plate and the front predetermined plane. .
It is suitable that the gap between the platen and the paper feeding table has a gap of three times the thickness of the printing paper. When the nut 5 is loosened, the adjusting nut 4 is rotated, so that the screw 23 drives the platen 25 to move in the externally threaded sleeve 24 to change the gap between the platen and the paper feeding table. Since the pitch of the coupling portion of the nut 4 and the sleeve 24 is large, and the pitch of the coupling portion with the screw 23 is small, when the nut is rotated, the adjustment is made by the differential of the two threads. When the nut 5 is rotated one revolution, the height of the platen is shifted by the difference between the two pitches.
3, the adjustment of the pulling force
The contact pressure of the paper take-up roller is obtained by changing the amount of deformation of the compression spring 21 by the adjustment screw 7. Depending on the thickness of the printed paper, the side gauge is equipped with two types of compression springs (one with a larger spring force and a smaller spring force) that can be replaced as needed.
4, the adjustment of the working position of the side rules
The lock nut 27 is loosened, and the screw 28 is loosened by the handle 6, changing the axial position of the sleeve seat 19 on the fixed shaft 18. The entire side gauge is moved so that the side gauge is greatly adjusted in the "left and right" direction. The fine adjustment is to loosen the lock nut 27, rotate the screw 8, and make the side gauge body 17 and the fixed shaft 18 move relative to each other to adjust slightly. The maximum pulling amount of the side gauge is 12 mm. Under normal circumstances, the paper retaining plate of the side gauge is preferably 5 to 8 mm from the side of the paper.
There are two side rules, which are installed symmetrically, but only one is used for printing, and the other should stop working. That is, the swing lever 20 is pushed by locking the eccentric 12 so that the pull paper ball is lifted up and does not come into contact with the pull paper wheel.
The following is an analysis of some of the problems that are prone to occur in side gauges and pre-regulations.
1. The front gauges of J2108 and J2205 offset presses are generally not suitable for four (or two) high and low adjustments at the same time. The daily operation can only be carried out separately.
2. The front plate is over the bottom of the paperboard, which hinders the paper transport, which may cause the paper to “go out”.
3, the front gauge upper paperboard is too high, it is easy to cause the paper edge to curl, causing the paper to "go over the head."
4. The front and rear positions of the two front gauges are adjusted too much, and the positioning line is not parallel with the busbar of the impression cylinder, which may cause paper or overprinting failure.
5. The pre-regulation is used frequently, and the positioning plate is easy to be worn, causing the “up and down” positioning to be inaccurate.
6. When one of the following conditions occurs, it is easy to cause the side gauge to be “insufficiently pulled”:
(l) The distance between the paper and the side gauge is too large;
(2) The side gauge pulling time is too short;
(3) The pressure of the side gauge pulling roller is insufficient, and the pulling force is light;
(4) The side plate is too low on the side plate;
(5) The pressure on the paper-pressing machine on the paper feeding table is too heavy;
(6) The side specified position block cardboard is embedded with paper dust or debris.
7. When one of the following conditions occurs, it is easy to cause the side gauge to “pull over”:
(l) The side gauge pull roller pressure is too large, or the side gauge upper paperboard is too high, or the paper is too close to the side gauge paper, the paper is too soft, etc.;
(2) The side gauge block is not at right angles to the positioning line formed by the front gauge board, so that the paper edge and the side gauge block are in "point" contact.
(3) The side gauges are used frequently, and the positioning block is worn, causing the “coming and going” positioning to be inaccurate.