JPS63160842A - Alarm device for paper flow in printer - Google Patents

Abstract

PURPOSE:To avoid the occurrence of waste prints due to faulty timing of sideward contact by a method in which a printer is always operated in normal condition by displaying that the sideward contact timing of paper is biased by more than a given value. CONSTITUTION:When the detection angle of a rotary encoder is out by the output level Ms+ or -5 deg. of sensor at a reference angle Ms in the turning phase Ms deg. of printer at the detection timing, sampling of sensor output is stopped, and ones corresponding to the angle Ms deg. among sensor output signals LSD stored in S10 are read out. The signal LSD so read out is converted into angle and stored as signal LMSD. The count (n) of counter is advanced by one step, and when 100th paper is supplied, judgement is made for max. LMSD value -min. LMSD value >5 deg.. In the case of YES, [dispersion great] is displayed, but in the case of NO, the oldest LMSD is erased, old data are shifted on the position, and data are orderly shifted to vacant positions. Finally, LSD is stored in the vacant position at the timing of net S10. At the time of ending the processing of S23 [good] is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper flow alarm device for a printing machine used in a sheet-fed printing machine.

[Conventional technology]

A sheet-fed printing machine separates sheets of paper stacked in a paper feeder one by one, passes them over the feeder board, hits the front-loading device, stops once, and then moves the sheets laterally to the side-loading device. Positioning in the left and right direction is performed by applying the Then, the positioned paper is held in the swing claw and carried to a predetermined position.

[Problem that the invention seeks to solve]

However, even if the horizontal feeding device detects an abnormality in the paper feeding timing, there is not enough time to stop feeding the paper.
Printing is performed by issuing only an alarm, and later the paper with the defective print is removed, but this not only takes time and effort to remove the defective product, but also causes the problem that if the user forgets to remove the defective product, the defective product will end up in the hands of the End-Aser.

[Failure to solve the problem]

means for detecting the timing at which the paper should hit the side rest;
A means for detecting the actual timing and a means for detecting the deviation thereof are provided.

[Effect]

It is displayed that the timing at which the paper hits the side support has deviated by more than a predetermined value.

〔Example〕

FIG. 1 is a flowchart showing the operation of an apparatus to which the present invention is applied. First, as shown in Sl, after setting the printing press rotation phase Ms' (for example, 3300) at the detection timing, the sensor output level L at Ma' is set as shown in Sl.
m, and then set the counter to n =
Preset to 1. Thereafter, as shown in S4, an angle P8 generated from a rotary encoder, which is provided on the plate cylinder and expresses the rotation angle in the number of pulses or an absolute signal, is detected, and as shown in S5, the angle Pg is determined to be the reference angle M8. , it is judged whether or not it is larger than (Me-5°), and if "NO", wait until "Ygsj" is reached, and if "YES", as shown in S6, (Ms +
5°). S6's judgment is "Y"
ES'', the output signal Lsi of the sensor provided on the horizontal machine is sampled and held as shown in S7.

In a horizontal machine, there are front supports 2 and 3 in the position shown in Figure 2, that is, in the direction of movement of paper 1 shown by the arrow. It is provided at the positions indicated by symbols 4 and 5, which move in the direction of. For example, as shown in FIG. 3, this horizontal machine 4 is provided with a light receiving element 4b above a support part 4a and a light emitting part 4C below, and when paper 10 is fed into the gap between them, , the light-emitting section 4c with the paper 10
light is blocked. The cutoff state is sampled every moment by a circuit (not shown), and changes in the analog quantity are taken in as changes in the mechanical phase. Then, the paper 10 finally comes into contact with the contact portion 4d, and its movement position in the lateral direction is restricted.

The reason why the horizontal presses are provided on both sides of the paper 1 is as follows. Normally, when printing on both sides, the front side is first printed by controlling the position using one horizontal press, and then the operator turns over the printed material and prints the back side again. At this time, if the length in the vertical direction is slightly different due to the cutting accuracy of the paper,
If only one horizontal press is used, the printed position will vary with respect to the pattern on the front side. For this reason, so that the pattern on the back side is printed at the same relative position to the pattern on the front side, printing is always done on both the front and back sides with one side of the pick paper as a reference.

Now, the sensor output signal Lllll sampled and held in S7 is converted into a digital signal LID in S8, and the following equation is determined as shown in S9.

(t, S-S°)≦LID≦L@+5° ---
−・−・・−・− (1) If this judgment is l'-ygsJ, the detected position is within the range of reference angle Ma±5°, so it is considered normal, and as shown in S10, the sensor output signal LI
Memory D and return to S4. In addition, in S5, “NO
”, the rotation phase of the machine is at the reference angle Ms.
Since the angle is far off, return to S4 and wait for the reference angle to be reached.

When returning from 810 to 84, the previous loop will be circulated at the sample timing, so the sensor output signal L
so is memorized moment by moment at the paper movement position.

If the sensor is defective or the paper timing is defective in S9, 89 is determined as "No", and the sensor output signal LaD is converted to the angle LIDD as shown in S11, and in S12 the value of (Ml-LID) is determined. is correct,
A judgment is made as to whether it is negative or zero. If it is zero, it indicates "sensor output level failure" as shown in 813, if it is positive, it indicates "low pull amount" as shown in 814, and if it is negative, it indicates "low pull amount" as shown in 815. ``Large pull amount'' is displayed.

As time elapses, the detected angle of the rotary encoder eventually outputs a sensor output at the reference angle Me, and the sensor output falls outside the 5° angle, and S6 is determined to be "NO", so sampling of the sensor output is stopped, and as shown in 816. Of the sensor output signal Lso stored in S10, the reference angle M8°
, and as shown in S17, the read signal Lap is converted into an angle and stored as a signal Lwmo. Then, as shown in 818, the count n of the counter is advanced by one step, and n becomes 100 as shown in S19.
Determine whether it is greater than or not. 819's judgment is "NO"
If so, the process returns to S4 and the same operation as described above is performed for the next sheet.

Eventually, when the 100th sheet of paper is fed, 819 becomes [Y
Since it is determined that EsJ, the following equation is determined as shown at 820.

Maximum value of Lwmo - minimum value of LMID>5°...
・(2) If the judgment of 820 is "ygsJ", "large variation" is displayed as shown in S21, and if it is l'-NOJ, the oldest Lman is deleted as shown in 822 and the next oldest is displayed at that position. Shift data and shift subsequent data to the vacant position. Then, the next 81 is placed in the last vacant position.
L3B is memorized at timing 0. When the processing at 823 is completed, "good" is displayed as shown at 824.

FIG. 4 is a block diagram of this device. 6 is a scheduled timing detection means 81 to S6 in FIG. 1, 7 is an arrival timing detection means 87-8IO, S16 to S20, and 8 is a display means. , 811-815, 821-824.

〔Effect of the invention〕

As explained above, this invention displays whether or not the timing at which the paper reaches the side feed is correct or not, so the machine can always operate in a normal state, and the timing of the side feed is different from the conventional one. This has the effect that no damage occurs due to defects.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing the operation of the device to which the present invention is applied, FIG. 2 is a perspective view showing the position of the horizontal support, FIG. 3 is a side view of the sensor, and FIG. 4 is a block diagram of the device. 6... Planned timing detection means, 7... Arrival timing detection means, 8... Display means.

Claims (1)

[Claims] A scheduled timing detection means for detecting the timing at which the paper should arrive at the side support, an arrival timing detection means for detecting the timing at which the paper reaches the side support, and displaying whether or not the difference between the two means is within a predetermined value. A paper flow alarm device for a printing machine, comprising a display means for detecting the flow of paper.