JPH0356344A - Method and device for detecting jammed paper thereof - Google Patents

Abstract

PURPOSE:To securely detect the jamming of cutform paper sheet in the inside of a lamp house by measuring the respective time widths of the signals obtained through the logical product of respective signals obtained by detecting the presence of cutform paper sheet in a plurality of positions on a transfer device and the operating signal of an electronic printing device, so that the paper jamming position of cutform paper sheet can be judged. CONSTITUTION:The toner image transferred on a cutform paper sheet 1 (not shown) is fixed by heating it by means of a lamp 31 in the inside of a lamp house 32. In the case, the time width of a logical product signal produced both by the signal obtained by detecting the presence of the cutform paper sheet 1 at the end of the lamp house 32 by means of a photosensor 43 and by the operating signal of an electronic printing device is measured for judging the jamming of the cutform paper sheet 1 in the inside of the lamp house 32.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an electronic printing device, and in particular, to the electronic printing device.
The present invention relates to a method and apparatus for detecting a paper jam in a conveyance path of shredded printing paper.

[Conventional technology]

As shown in FIG. 7, the conveyance path of the cut sheet in conventional electronic printing is as shown in FIG.
The slip 1 is brought into alignment with the photosensitive roller 122 by the retractor 23, the toner image is transferred by the transfer device 2/l, and then transported into the lamp house 32 by the transport unit 1/25, where it is transferred to the flash lamp 31. It was established by The sheets were then ejected by rollers 26 and 27, which were moved by a motor 29, and were housed in receiving units 1-28.

In addition, optical sensors 4 and 42 are provided to measure the time it takes for the cut sheet 1 to pass between the two sensors, or to check the number of sheets counted by both sensors and -f2? +Q I was trying to monitor the transportation status of Elt slips. In other words, if the above-mentioned passing time is excessively long, or if the above-mentioned counts of both optical sensors do not match, a jam has occurred between the two optical sensors, so an alarm should be issued or the operation should be stopped. was.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, for example, if two sheets of ilJ slips are conveyed overlappingly and one of them is left behind in the lamp house 32, the sheets are continuously conveyed, so that the JF However, it was determined that the incident was a ploy, and an alarm could not be issued. There was also the problem that it was not possible to determine the location of Siamese outbreaks.

When the paper sheet stagnates in the lamp house 32, it is continuously exposed to the light emitted from the flash lamp 3l, causing it to turn yellow, and even smoke and catch fire. According to an experiment, when a cut sheet with a black print area printed on the front side of the printing area was stagnated in the -12 lamp house 32, the luminous energy of one time was 500.
J flash lamp 31 at a rate of 2.2 times per second 10
When irradiated twice, the cut sheet turns yellow. The irradiation time for J1-1-O was approximately 4.5 seconds, and if the irradiation time was allowed to stagnate any longer, there was a risk of serious accidents such as smoke and ignition.

In addition, the I~ color on the cut sheet stagnant in the lamp house 32 will adhere to the protective glass surface of the flash lamp 31 and other surfaces, so if this happens repeatedly, the light transmittance will decrease and fixing failure will occur. become. Since the protective glass and the inside of the lamp house are not cleaned in normal maintenance work, the occurrence of toner adhesion makes maintenance work extremely troublesome.

The object of the present invention is to provide electronic printing that can reliably detect the stagnation of paper in the lamp house. The purpose is to oppose the position A.

Furthermore, it is an object of the present invention to provide an electronic printing apparatus that can determine the location of jam occurrence in a cut sheet conveyance path by using the above-mentioned detection method or detection device.

[Means to solve the problem]

In order to achieve the above object, the present invention detects the presence of the cut sheet at the end of the lamp house, and calculates the detection signal based on the logical product of the operation of the electronic printing device (11÷J). The time width of the signal is measured, and a paper jam alarm is generated when the time width indicated by -1 exceeds a predetermined time width.

Further, a detector for detecting the presence of a plurality of cut sheets is provided on the conveyance device, and a paper jam is detected in each detector using the method described above, and the position of the paper jam of the cut sheets is determined. I'll do what I do.

Furthermore, as the L detector, a photodetector that detects the reflected light from the single sheet, or a detector that detects light from a light source placed on the back side of the -I double eyelid sheet is used. do.

Furthermore, I:. The conveying device is arranged so that the detector passes over the printing prohibited area of the -11 sheet.

Furthermore, a history circuit is provided in the output circuit of the detector to prevent unstable operation of the detector.

[Effect]

The paper jam detection device of the present invention configured as described below is as follows:
It is possible to detect stagnation of a cut sheet while the electronic printing device is in operation, regardless of the printed content of the cut sheet.

Further, by using a plurality of paper jam detection devices of the present invention, it is possible to determine the stagnant position of the idle slip paper in the electronic printing device.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a conveyance path of a cut sheet provided with an optical sensor according to the present invention. In FIG. 1, optical sensors 43 and 44
are provided before and after the lamp house 32, respectively. The above optical sensor corresponds to the white part of the lli slip sheet.
Put out a sword (high) and put out an O (low) corresponding to the black part. Also, if there is no cut sheet, 0 (low) is issued.

A printing prohibited area 12 as shown in FIG. 2 is provided around the periphery of the cut sheet 1. As shown in FIG.

Since the width of the cut paper is longer than the width of the lamp house 32, the cut paper 1 in the lamp house is connected to the optical sensor 43 or 4.
4, or protrudes from both sides. Therefore, if two optical sensors 43 and 44 are used, it is possible to detect paper jams in the lamp house 32 without missing them. However, in most cases, paper jams can be detected. t'! Koshita r11. Since the slip protrudes toward the optical sensor 43 side, the paper jam can actually be detected using only the optical sensor 43.

This optical sensor 43 also detects ○ when there is no cut sheet I.
[print area] - cannot be distinguished from the case where the black part of soil is detected. This inconvenience is caused by paper feed unit l~2.
This problem can be solved by using the information that the paper sheets are being supplied from No. 1, that is, the information that the electronic printing device is in operation. That is, the normally operating optical sensor 43 is 1,
Since the outputs of and O are output alternately, O does not output continuously. Therefore, if the output of the optical sensor becomes 0 and continues while the apparatus is in operation, it can be determined that there is a paper jam.

Similarly, if the device is in operation and the output of the optical sensor continues to be 1, it can be determined that there is a paper jam. Incidentally, conventional electronic printing apparatuses are generally equipped with a signal generating apparatus indicating that the apparatus is in operation.

FIG. 3 is a waveform diagram explaining the above logic, and FIG. 4 is a logic diagram of the present invention for detecting paper jam.

In FIG. 3, L is a lighting permission signal for the flash lamp 3, which also serves as an operation signal for the electronic printing device. The period of L=1 corresponds to the operating period, during which the flash lamp is lit. S is the output signal of the optical sensor 43, and when the cut sheet is blank as shown in 13, the waveform S
1, and when the printing area of the rli slip is black like 14, the waveform becomes like S2. A1 is an AND signal of the above I and S, and A2 is an AND signal of L and the inversion of S. If the lighting permission signal L is 1 and the cut sheet 13 or 14 is stagnant, either CJ or A2 is 1.
When the lighting permission signal L is O, both become 0.

Therefore, the period during which the above two ANDs are 1-1 is measured, and if this is longer than a predetermined period, it can be determined that there is a paper jam.

In FIG. 4, AND circuits 51 and 52 output the ANDs AI and A2 of the above-mentioned L, S and D, respectively, and the inverse of S obtained by the inverter 53, which are applied to counters 54 and 55, respectively. Counter 5 1J 5 51
C is a clock {11 = 7 C is applied to the end f'i' and the period in which the level of A1 and A2 is 1 is J1. When this 41 value exceeds the respective count values set in advance in both counters, both counters generate their respective outputs, and the flip-flop 57 is set to 1 via the OR circuit 56, making the output 1.

When the output of the flip-flop 57 is 1, it corresponds to the occurrence of paper jam, and when the output is 0, it indicates a normal operating state without paper jam.

In the method of the present invention described above, when the optical sensor detects a boundary between white and black, although it is very rare, the output may fluctuate unstablely between 1 and O. Schmidt circuits 1 to 6 inserted after the optical sensor 43 in Fig. 4 are for giving B history characteristics to the output S of the optical sensor 43, thereby making it possible to alleviate the unstable operation described in 12. .

Furthermore, when the optical sensor 4 is installed on the print-prohibited area 12 of the cut sheet 1 as shown in FIG.
, the inverter 53, AND circuit 11]1 path 52, counter 55, and OR circuit 56 in FIG.
etc. can be omitted.

In the embodiment of the present invention shown in FIG. 5, the cut sheet 1 must be guided and conveyed so that the print-prohibited area 1-2 of the cut sheet 1 always passes the optical sensor 4-1-. However, the 6th
As shown in the figure, a light source 7 is provided opposite the optical sensor 4,
If the light sensor 4 detects whether or not the light from the light source 7 is blocked by the Q1 paper 1, the light sensor 4 can be installed at any position within the width of the paper 1. The same effect as in the case of FIG. 5 can be obtained.

In each of the embodiments of the present invention described above, the optical sensor 43 installed near the lamp house 32 shown in FIG. 1 has been described. However, the method 1''ii+2 can also be applied to other optical sensors, such as 4], 42, 44, or newly added optical sensors.

For example, when the logic circuit of the present invention shown in FIG. 4 is connected to each optical sensor, jp,
Atsushi of the ballot paper. {Since it is possible to detect F, it is possible to identify the paper jam 1゜Iii't1 2 in the conveyance path shown in Fig. J2 The position of the paper jam can be specified with higher accuracy.

〔Effect of the invention〕

As described in detail above, when the present invention is applied, the existence of cut sheets left behind in the lamp house can be detected by heavy running, so that the cut sheets are excessively heated and yellowed. Furthermore, serious accidents such as smoke and fire can be prevented.

Furthermore, if the present invention is applied to each optical sensor that is used in the transport path of cut sheets, it is possible to detect paper jams at each sensor position. equipment can be provided.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a cut paper conveyance path of an electronic printing device equipped with an optical sensor used in the present invention, FIG. 2 is a diagram showing printing area divisions of a cut paper, and FIG. A waveform diagram explaining the paper jam detection logic, FIG. 4 is a paper jam detection logic circuit diagram of the present invention, FIG. 5 is a diagram showing the arrangement of the optical sensor used in the present invention, and FIG. 6 is a diagram showing the optical sensor used in the present invention. and FIG. 7 is a diagram showing the arrangement of a light source, and FIG. 7 is a diagram showing a cut sheet transport path of a conventional electronic printing apparatus. 1 is a cut sheet, 11 is a print area, 12 is a print prohibited area,
31 is a flash lamp, 32 is a lamp house, 4 is a light sensor, 41 to 44 are each light sensor 51, and 5 is a logical product.
4 is a counter, 56 is an OR circuit, 57 is a flip-flop, 6 is a history circuit, and 7 is a light source.

Claims (1)

[Claims] 1. In an electronic printing device that fixes a toner image transferred onto a cut sheet by heating it from a lamp in a lamp cover, the presence of the cut sheet at an end of the lamp cover is detected. and the operating signal of the electronic printing device to determine whether or not the cut paper is jammed within the lamp cover. paper jam detection method. 2. In an electronic printing device in which a sheet of paper onto which a toner image has been transferred is conveyed by a conveyance device and heated and fixed by a fixing device, the presence of the sheet of paper is detected at a plurality of positions on the conveyance device. The time width of each signal obtained by ANDing each of the signals obtained from the electronic printing device with the operating signal of the electronic printing device is measured to determine the paper jam position of the cut sheet. Characteristic paper jam detection method. 3. In an electronic printing device that heats and fixes a toner image transferred onto a cut sheet using a lamp in a lamp cover,
a detector for detecting the presence of the cut sheet at the end of the lamp cover; a circuit for calculating the logical product of the output signal of the detector and the operation signal of the electronic printing device; and a time period of the logical product signal. A paper jam detection device characterized by comprising a width measuring circuit. 4. In an electronic printing device that transports the cut sheet onto which the toner image has been transferred by a conveyance device and heats and fixes it by a fixing device, the presence of the cut sheet is detected at a plurality of positions on the conveyance device. A plurality of detectors, a circuit that calculates an AND of each of the output signals of the plurality of detectors and an operating signal of the electronic printing device, and a circuit that measures the time width of each of the AND signals. A paper jam detection device characterized by: 5. In claims 3 and 4, the cut paper is detected by a photodetector that detects reflected light from the cut paper, or a detector that detects light from a light source disposed on the back side of the cut paper. A paper jam detection device is characterized in that it detects the presence of a paper jam. 6. The paper jam detection device according to claim 3, wherein the conveying device is arranged so that the detector passes over a print-prohibited area of the cut sheet. 7. A paper jam detection device according to any one of claims 3 to 6, characterized in that a history circuit is provided in the output circuit of the detector.