JPS643671B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-speed printing device in a data processing device, and particularly to detection and reporting of paper abnormalities.

Conventionally, in this type of high-speed printing device, as shown in FIG. The paper passed between the tractor 5 and its paper presser 10, came into contact with the paper support 6, was sandwiched between paper feed rollers 7 and 8, and was ejected out of the housing.

In this type of paper feeding mechanism, a paper abnormality (paper break or paper jam) detection mechanism is provided at the tractor 2 and the tractor 5.
A method was used in which whether the paper 1 was present in the tractor 2 or 5 portion was detected by a spring-type mechanical microswitch. Therefore, although there is paper in the tractor unit, when the paper hole is torn and the paper does not move, or when there are many line breaks such as page breaks, the paper may momentarily sag as shown at 11. When the paper is rapidly pulled by the rollers 7 and 8 and the paper is torn between the tractor 5 and the roller 7, there is a possibility that the paper abnormality cannot be detected or a large amount of paper is lost.

When setting the paper, it is necessary to reduce the pressure on the roller 7, confirm that new paper has been ejected from the roller 8, and then adjust the pressure again to the printing state.If the pressure on the roller 7 is too weak, the tractor 5
There is a drawback that too strong pressure on the paper jam between the rollers 7 and 7 may cause paper breakage.

The present invention has been made in view of the above-mentioned conventional circumstances, and therefore, an object of the present invention is to provide a novel high-speed printing device that makes it possible to eliminate the above-mentioned disadvantages inherent in the conventional technology. It is in.

In order to achieve the above object, a high-speed printing device according to the present invention includes a sensor that is disposed near a paper feed roller provided at a paper ejection port and detects the movement of paper, and a sensor that detects the movement of the paper. a first resettable flip-flop for holding;
a comparator that compares a jumper output obtained by converting the detection sensitivity of the sensor into the number of line feeds and an output of a line feed register for setting the number of line feeds, and indicates that the output of the line feed register is larger than the jumper output; For example, a series of check timing generation circuits composed of one-shot circuits, which generate a series of check timing signals when activated by an AND condition between the output of the comparator and a line feed command signal that instructs the start of a line feed; A NAND gate receives the output of the timing generation circuit and the output of the first flip-flop, and a second flip-flop is set by the output of the NAND gate and indicates the state of the paper according to each of the series of timings. It is characterized in that by reading these second flip-flops, the adjustment state of the paper feed mechanism section and the paper abnormal state in which paper movement has not occurred are reported as the device state.

That is, in the present invention, a sensor that directly detects the movement of paper is provided between the rollers 7 and 8 in FIG.
A paper warning is reported when the paper movement, which changes depending on the adjustment state of the paper feed mechanism section, is detected earlier or later than the normal time range through a series of check timings, and the paper warning is detected between the normal time range and the warning time range. In either case, when paper movement is not detected, it is possible to prevent paper abnormalities from occurring by reporting paper abnormalities, and when paper abnormalities are detected, the high detection accuracy prevents paper loss. The amount will also be very small.

Next, a preferred embodiment of the present invention will be explained in detail with reference to the drawings.

2 and 3 are block diagrams showing one embodiment of the present invention, and all circuits not directly related to the present invention are omitted.

In FIG. 2, the line feed register 24, in which the number of line feeds is set, has the line feed number set by the data bus 23 and the strobe signal line 22, and its output 25
is input to the line feed control circuit 27, and when the line feed command signal line 26 is driven, the line feed control circuit 27 starts operating, and its output signal 28 causes the tractor motor 2 to
9 to move the paper. The speed control of the tractor motor 29 is carried out at a trapezoidal speed as shown in FIG. 4a, which shows acceleration, constant speed, deceleration, and stop.

Paper movement detection sensor (reference number 51 in Figure 3)
The speed of the paper at the 12 points in Figure 1, where the paper is installed (as shown in Figure 4), accelerates and stops later than the speed in Figure 4 (a), as shown by b, because the paper slackens momentarily. It becomes a triangle. On the other hand, another output 31 of the line feed register 24 in FIG. 33 is jumper 21
When the content of the output 31 of the line feed register 24 is greater than the output 30 of the line feed register 24, a "high" level is output.
The output 33 of the comparator 32 and the line feed command signal 26 are ANDed by a gate 34, the output 35 of which is input to a one-shot circuit 36, and the output 37 of FIG.
Generates a pulse shown by . When the output 37 falls to the “low” level, the one shot circuit 38
operates and generates a similar pulse. Similarly, reference numerals 40 and 42 are also one-shot circuits and generate a series of pulses. The values of the time constant circuits 44, 45, 46, and 47 that determine the pulse width are the first
It must be determined experimentally from the relationship between the paper tension due to the pressure of the roller 7 in the figure and the delay time of paper movement at the point 12. Pulse signal 37 in FIG. 2 indicates a time period in which the tension on the paper is too strong and causes paper tearing, pulse signal 39 indicates a time period in which the tension on the paper is appropriate, and pulse signal 41 indicates a time period in which the tension on the paper is weak. The pulse signal 43 indicates a time period in which it is determined that no paper movement occurs, and the pulse signal 43 indicates a time period in which it is determined that no paper movement occurs. Second
Signal lines for pulse signals 37, 41, and 43 in the figure are connected to signal lines 57, 58, and 59 in FIG. 3, and are inputted to gates 60, 61, and 62, respectively, as sheet movement check timing.

On the other hand, the output 52 of the paper movement detection sensor 51 provided at 12 points in FIG.
line feed command line 2 in Figure 2.
6 is connected to the signal line 53 of FIG. 3, so that the flip-flop 54 is reset on every new operation. The output 55 of the flip-flop 54 is
Connected to NAND gates 60 and 61, gate 6
0 is a gate for setting a paper tear warning, and when the NAND condition is satisfied, an output 63 sets a flip-flop 69 indicating the paper condition. Similarly, NAND gate 61 is a gate that sets a paper jam warning on the condition that flip-flop 69 is not set, and when the NAND condition is satisfied, its output 65
A flip-flop 70 is set to indicate the paper status. The complement signal 56 of the flip-flop 54 is input to the NAND gate 62, and when the paper does not move, the NAND condition is satisfied and the flip-flop 71 is set to indicate a paper abnormality by an output 67.

Outputs 72, 73, and 74 of these flip-flops 69, 70, and 71 are read as device status information and reported to the host device after the printing operation is completed. These device states can be reported to an operator or the like as information requesting manual intervention. A signal 68 is output as device status information when reading is completed, and is sent to flip-flops 69, 70, 7.
1 is reset.

Next, the time chart shown in FIG. 4 will be explained. Time period X indicates a case in which the flip-flop 69 of FIG. 3 is set to warn of the danger of paper tearing due to the paper moving faster than normal. Time period Y indicates a case where the paper moves slower than normal and the flip-flop 70 of FIG. 3 is set to warn of the danger of paper jam. Time period Z indicates a case in which a paper abnormality is detected in which paper movement is not detected within a certain period of time even though there has been a paper change operation that exceeds the detection sensitivity of the paper movement sensor.

Sensors for detecting paper movement include a method of optically detecting and counting holes in the paper, a method of printing marks on the paper and detecting changes in light reflectance,
Various methods are used, such as a method in which magnetic material is coated on paper and magnetic changes are detected.

Further, in this embodiment, a one-shot circuit and a time constant circuit are used as the timing generation circuit, but it goes without saying that the timing generation circuit may be constructed using a counter and a clock generation circuit as an alternative. It is.

As explained above, the present invention prevents the occurrence of paper abnormalities by checking in what time period the output of the paper movement sensor is output after a line feed command, and at the same time prevents paper abnormalities from occurring by highly accurate detection. This has the effect of reducing paper loss in the event of an abnormality.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a paper route in a high-speed printing device, and FIGS. 2 and 3 are block configuration diagrams showing one embodiment of the present invention.
The figure shows a detailed configuration diagram of the timing generation circuit for checking paper movement, Figure 3 shows the detailed configuration diagram of the paper abnormality detection circuit, and Figure 4 shows the circuit configuration shown in Figures 2 and 3. This is a time chart showing the operation. 1... paper, 2, 5... tractor, 3... printing hammer, 4... type drum, 6... paper support,
7, 8... Paper feed roller, 9, 10... Paper presser, 21... Jumper, 24... Line feed register, 27... Line feed control circuit, 29... Tractor motor, 32... Comparator, 36, 38 ,40,42
...One shot circuit, 44, 45, 46, 47
... Time constant circuit, 51 ... Paper movement detection sensor, 54, 69, 70, 71 ... Flip-flop.

Claims (1)

[Claims] 1. In a high-speed output device using paper such as a computer system, a sensor disposed near a paper feed roller provided at a paper ejection port and directly detects paper movement at a line feed or page feed;
A resettable first flip-flop that holds the output of the sensor compares the jumper output obtained by converting the sensitivity of the sensor to the number of line feeds with the contents of the line feed register that sets the number of line feeds, and calculates the line feed register from the jumper output. a comparator that outputs that the content of is large; and a comparator that resets the first flip-flop when a line feed command requesting the line feed control unit to start a line feed operation, and simultaneously outputs the output of the comparator and the line feed command. a timing generation circuit that generates a series of check timings based on the AND condition of the first flip-flop; 2, a third flip-flop, and a fourth flip-flop, and by reading the second or third flip-flop, it is possible to determine whether the adjusted state of the paper feed mechanism section is in a state where paper breaks are likely to occur or paper jams are likely to occur. The fourth flip-flop is set after a certain period of time has elapsed despite a series of timings being generated by a warning signal that detects and reports a state where a paper jam is likely to occur and the output of the comparator. A high-speed printing device characterized by sometimes reporting a signal reporting a paper abnormality to a host device as a device status.