JPS59212360A - Blank jam detector - Google Patents

Abstract

PURPOSE:To detect quickly the disordered traveling condition of printed continuous blank at a stacker section by providing an adder/substracter of first and second counting means. CONSTITUTION:In a first counting means 10, a register 11 receives through a terminal 11A a digital value corresponding to the number of feed perforations on one page of a continuous blank set beforehand according to said blank used and stores temporarily said value. A counter 14 counts the output of a blank feed perforation detector 13 provided in a tractor section of a printer. A comparing circuit 12 compares a set value of the number of feed perforations corresponding to one page of blank in the register 11 with the counted value of the counter 14 and generates pulse, when both values coincide with each other, to send it to the input of a next adder/subtracter 30 as an adding value. A second counting means 20 consists of a light sensor 15 constituted from a light source 4 and a light receiving element 5 for detecting every one page of discharged blank 3, an amplifier, a delay circuit 21 and a flip-flop circuit 22.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a paper jam detection device that promptly detects disturbances in the running state of printed continuous paper in a stacker section.

(b) Background of the Technology As the processing speed of recent printing apparatuses increases, the technology for detecting jams in the stacker section of the paper processing apparatus is required to have even higher performance.

In other words, it is desired to develop a method for detecting a paper jam state reliably and at high speed without erroneous detection in the paper detection mechanism. .

(e) Prior Art and Problems Conventionally used simple jam error detection means include an optical sensor that counts the number of paper feed holes in a tractor section (not shown) of the paper feed mechanism, and detects the number of paper feed holes as the paper feeds. There is a method in which a jam error is determined based on a disconnection of the optical sensor output obtained from the output, and a method in which a jam error is determined when a detection signal of the ejected paper stacking level of the stacker section occurs twice in succession within a predetermined period of time. The former is limited to the tractor section and is not limited to the output paper loading position. In addition, both the former and the latter have the disadvantage that jam detection is slow and cannot respond to high-speed printing technology1. Fig. 1 is a diagram for explaining the conventional jam detection method for high-speed printing. Continuous slip paper 3 (from p. 17) old v (abbreviated as 3) fed out by feed roller 2 is folded along the crease and stacked. 3 fold one 1'
A light source 4 and a light receiving element 5 are provided obliquely to M as shown in the figure.

The output of the light-receiving element 5 is amplified by an amplifier 6 and then input to a timer 7. The timer 7 outputs a logical value "()" for the required time for each input pulse from the amplifier 6, and when the time is up, it outputs a logic value "()". The output of the timer 7 and the paper feed signal PF are input to an AND gate 8, and the AND output 9 is used as a jam detection signal.

That is, if a jam occurs in the stacker section, the light receiving element 5
The amplifier 6 becomes useless because the reception of light is prevented, and the timer 7 outputs a logic value "1" after the required time and sends it to the AND gate 8. At this time, paper feed (i4 PF is reciting
(Continuing the paper feed command), the AND gate 8 outputs a jam detection signal 9.

However, the method shown in Fig. 1 is effective for those that continuously send paper feed signals, such as in non-injection printing, but the paper feed signal PF, such as impact printing, is
If the paper is sent intermittently, the time period during which paper feed commands are interrupted becomes long, and there is a drawback that a jam detection signal is not output even if a jam actually occurs.

Furthermore, the conventional jam detection configuration described above has the following drawbacks. That is, referring to the detailed perspective view of the light-receiving element 5 in FIG. 2, depending on the quality of the paper or the strength of the folds, the ejected paper 3 may have bulges at both ends of the stacked folds as shown in the figure. The central part may be concave, and if the bulges at both ends become severe, the bulges may obstruct the optical path of the light source 4 to the light-receiving element 5, resulting in false detection.

(d) Object of the Invention In view of the above-mentioned conventional drawbacks, the present invention aims to provide an apparatus that can detect and display paper jams reliably and at high speed without erroneous detection.

(e) Structure and object of the invention According to the present invention, printing is performed on continuous paper, and the printed paper is placed at a predetermined position f? In a printing device that ejects the paper into paper, folds it along the fold line, and stacks the paper, the 9i
The first step that counts the number of pages to be fed on the printing unit side of S continuous paper.
a counting means, a second counting means for counting the number of pages of the paper stacked on the discharge side, and a count signal of the first counting means is inputted as an addition value signal, and a count signal of the first counting means is input as an addition value signal, The present invention is characterized in that an adder/subtractor is provided which inputs a count signal as a subtraction value signal, and when the output content of the adder/subtractor reaches a required value on the positive number side, it is detected as a state of disturbance in the paper running state. This is accomplished by providing a paper jam detection device.

(f) Examples of the invention Embodiments of the present invention will be described below with reference to the drawings.

In internal placement, parts corresponding to those in FIG. 1 are given the same reference numerals, and redundant explanation thereof will be omitted.

FIG. 3 shows block N of the paper jam detection device according to the present invention.
This can be roughly divided into the first counting means 10 and the second counting means 10.
It consists of a counting means 20, an adder/subtractor 30, and a display device N40. For the first counting means, register 11 and comparison circuit 12
, a paper feed hole detector 13 , and a counter 14 .

The register zl temporarily stores a digital value corresponding to the number of perforations per page of the continuous paper to be used, which is set in advance according to the continuous paper to be used, by manually inputting it from the terminal 11^. The counter 14 counts the output of the paper feed hole detector 13 provided in the tractor section of the printing device. Comparison l111 path 12 compares the set value of the number of perforations corresponding to one page of paper in the register 11 with the counted value of the counter 14', and when the two values match, it outputs a pulse and starts the next adjustment. Manpower as an additional value.

Addition of this pulse output means that one page of continuous paper has passed through the printing unit side, that is, the tractor unit.

On the other hand, the second counting means includes an optical sensor 15 consisting of a light source 4 and a light receiving element 5 for detecting the ejected paper 3 page by page, an amplifier 6, and a delay 1! J1 path 21 and flip-flop circuit 22
It consists of As shown in the perspective view of FIG.
The optical path is in a direction slightly inclined from the parallel line with the paper surface of one page, and the light source 4 and light receiving #
Child 5 is set up oppositely. The reason why the optical path is slightly inclined is to lengthen the light shielding time by the paper as much as possible and to obtain reliability in the output signal. In addition, the position of point P and the ejection state of output paper 3 are as follows.
[It is always maintained at a constant position as shown in the figure by the action of the mounting level meter and level adjustment mechanism. Therefore, the optical sensor 15
outputs one buffless signal for each page of υ1 output sheets, and inputs it to the delay circuit 21 via the amplifier 6.

The delay circuit 21 connects the amplifier 6 with a time constant element (not shown).
This causes a delay in the amount of time required for puffless output.

The delayed output is input to the reset terminal 'f-R of the flip-flop circuit (hereinafter abbreviated as FF circuit) 22.

The FF circuit 22 also inputs the output of the first counting means 11' to the clock terminal C, and always inputs the logical value 1'' to the data input, and outputs the output from the output terminal Q to the adder/subtractor 3.
7. The display device 40 is composed of a display drive circuit 41 and a display 42, and responds to the output of the adder/subtractor q unit (()).

Next, the operation will be explained with reference to the time chart of FIG. The clock signal C in the time chart is the output waveform of the comparison circuit 12, that is, the paper feed signal for each page on the printing unit side. The L signal is a pulse signal obtained from the output of the light receiving element 5 via the amplifier 6 and indicates the true number of ejected sheets;
becomes the reset signal R, which is the output waveform of the delay circuit 21 which delays the L signal by the required time. The Q signal is an output signal of the FF 22 and becomes a manual input (subtraction value) signal of the adder/subtractor 30. T indicates time, and t1 to L indicate times corresponding to the broken lines, respectively.

[The cock signal C is a paper feed signal in which one pulse corresponds to every 11-1 of the printing device, and in the case of impact printing, the paper feed signal is subdivided by line feed, so In this embodiment, the first one-noon response rises at time t1 (hereinafter simply referred to as t) and ends at t.

The output of the optical sensor 5 becomes an L signal through the amplifier 6, which is slightly higher than the normal clock signal C. At t2, the output goes up at t, and at h
%ru. The reset signal R delays the L signal by a required time by the action of a time constant element f- (not shown) of the delay circuit 21 and rises at t4.
It passes at t6. , the data terminal of FF22 is always “1”.
Since " is applied, the output signal Q rises at tl of the clock signal C, and rises F at the next rise of the reset signal R at t4. By repeating the above operation, the adder/subtractor 30 inputs the lth? input. and subtracted human power cancel each other out, resulting in a no-output state.

Even if the interval of the clock signal C changes, the clock 43
The time relationship between the rising edge tl of the output signal Q corresponding to the signal C and the falling edge t4 of the output signal Q corresponding to the reset signal R; the L signal is slightly delayed from the tarok signal C, and the reset signal is delayed by the required time from the L signal. There is no change in the direction and amount of R rising J. However, if the ejected paper 3 becomes jammed at t2 and the optical path of the optical sensor 15 is interrupted, the reset signal R continues to rise from t8 onwards. At this rising edge, the output signal Q falls. From then on, even if the clock signal C is manually input at t, the reset signal R continues, so the output signal Q continues to fall. Therefore, the output of the adder/subtractor 30 is subtracted. There is no value input and only the h++ si values tend to increase. Here, the output of the adder/subtractor is a constant value, for example, paper 2~
3L (Display drive times if' when the value equivalent to minutes is exceeded;
) 41, the state of paper jam can be displayed reliably and quickly. Regardless of whether it is an impact type or a non-impact type, it is possible to accurately and quickly detect people and people in the stacker section of IJ printing equipment, and it can also improve printing efficiency by reducing false detections. effective

[Brief explanation of the drawing]

1 and 2 are diagrams for explaining conventional jam detection for high-speed printing, FIG. 3 is a diagram of a printer according to an embodiment of the present invention, and FIG. i i・
Thin perspective view, No. 5X! 11b shows a time chart for explaining the action. In the figure, 1 is a stacker and 3 is a continuous slip form. 1() is the first counting means, 20 is! 32 counting means,
3 (+ indicates the addition device, 4t+ indicates the display device. Fig. 1 Fig. 2

Claims (1)

[Claims] In a printing device that prints on continuous paper, discharges the printed paper to a predetermined position, folds it along the paper fold line, and stacks the paper, a first counting means for counting the number of pages of the continuous paper fed to the printing unit side. and a second counting means for counting the number of pages of the paper stacked on the discharge side, and inputting the count signal of the first counting means as an addition value signal,
An adder/subtractor is provided to input the count signal of the second counting means as a subtraction value signal, and when the output content of the adder/subtracter reaches a required value on the positive side, it is detected as a state of disturbance in the paper running state. A paper jam detection device characterized by: