JPS6184155A - Facsimile receiving device - Google Patents

Abstract

PURPOSE:To reduce the cost of communication by storing image data without interrupting the reception of the image data even if recording paper jams. CONSTITUTION:If a jam occurs at the start of the recording of, for example, the 3rd page, the reception is not interrupted and up to the 4th pages are received and stored in a scope memory 2 continuously. The decoding of the received pages, and recording and reproduction, however, are interrupted and a jam sensor is monitored continuously until the jam is removed. When the jam is removed, information of the 3rd page whose recording is interrupted is decoded and recorded. For the purpose, a control part 5 sets the readout start address of the 3rd page to a number B on the basis of a storage control table and outputs a decoding start and a print start signal to record and reproduce the 4th page after the 3rd page, thereby finishing its operation.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a facsimile receiving device, and more particularly to a facsimile receiving device equipped with a memory for storing received image data and a recording device for recording and reproducing images. be.

[Prior Art] Most conventional facsimile receiving devices use roll paper instead of cut paper as the recording paper.

Since there was no device with enough memory to store more than one page's worth of image information, in such devices, if the receiving side jammed the recording paper during reception, the reception was immediately interrupted, but the jam did not occur. The generated page could not be recorded or played back on the receiving side.

Therefore, in order to prevent such inconveniences, facsimile receivers have been developed that have a large capacity memory in order to increase pixel density, improve image quality such as halftone expression, and improve transmission speed.

This large capacity memory is used not only to store image information, but also to match the data rate received via the line, the processing speed of the decoder, the decoder's output data, and the printer's data processing speed. It is also a means of

Furthermore, in order to improve image quality, there are some that use an electrophotographic recording device that uses cut paper as a recording device.

However, even in such a facsimile receiving apparatus, when a jam occurs in the recording paper, there is no means for automatically recording and reproducing the jammed page on the receiver side, and communication is interrupted at the same time as the jam occurs.

Further, even if a large memory is installed so that image reception can be continued, there is a drawback that it is impossible to know the number of remaining pages of the received image after the paper jam is cleared.

[Purpose] The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional technology, and it is possible to store image data without interrupting the reception of image data even if a recording paper jam occurs. The purpose of the present invention is to provide a facsimile receiving device configured as follows.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

[First Embodiment] Figure 1 and the following illustrate the first embodiment of the present invention.
FIG. 1 shows a block diagram of the device of the invention.

In FIG. 1, the reference numeral 1 indicates a receiving circuit, which is a known interface circuit, and which receives the MH signal from the line.
(Modified Huffman) It plays the role of receiving the encoded image signal and writing it into the memory 2.

Writing to memory 2 is EOL (end of line)
RT C (return to
control) signal is detected and stopped. This memory 2 has a capacity of 32 Mbit, for example.

Please note that this device only handles A4 size images, such as 4L:'!
Since the e degree is 8 pel/mm x 8 pet/am, the pixel information on one A4 size sheet is approximately 4 Mbit.
Since it is stored in memory 2 in the MH code compressed form,
About 10 to 100 page information can be stored.

The signal read from memory 2 is guided to decoder 3 and decoded.

The decoder 3 is a known MH decoding circuit, converts the MH encoded image data into pixel signals, and outputs the pixel signals to the printer 4.

The decoding operation starts when the decoding start signal from the control unit 5 becomes high level, and reading of data from the memory is started.

Actually, decoding is started from the time when the EOL signal is detected, and when the RKC signal is detected, decoding is stopped and at the same time, the detection of R stop is notified to the control unit.

The printer 4 is of an electrostatic recording type, and jam sensors 6 to 8 are provided at three locations inside. The outputs of these jam sensors 6 to 8 are guided to the control section 5.

The jam sensor 6 detects when the recording paper is jammed in front of the developing drum 9.
If the jam sensor 8 is jammed between the discharge rollers 11 and
Since a jam is detected in each of the parts, the controller 5 can detect a jam at any position in the printer 4.

The control unit 5 is a microcomputer and ROM.

It is composed of a known control circuit including RAM and the like.

The control unit 5 sets a write start address and a read start address for the memory 2, and specifies the start address when writing from the receiving circuit 1 to the memory 2 and reading from the memory 2 to the decoder 3. .

Furthermore, the write address of the memory in a state where the memory 2 has stopped writing is sensed.

Also, for the decoder 3, the decoding start signal is set to high level to start decoding, and then the RT from the decoder 3 is
When the C detection signal is generated, the decoding start signal is returned to low level.

It also sends a print start signal to the printer 4 to instruct it to start recording.

FIG. 2 shows how received data is stored in the memory 2.

First, the control unit 5 sets the starting address of the old data in the memory 2 to address 0.

When the receiving circuit 1 detects the EOL signal at the beginning of the first page, it starts writing to the memory 2 from address 0, and writes the RTC
When the signal is detected, it notifies the control unit 5 and at the same time stops writing the received data.

When the control unit 5 receives the RTC detection signal from the receiving circuit 1, it knows that the accumulation of image information for the first page is completed, and senses the write stop address A to the memory 2 at this point.

Then, the write start address is set to address A for writing the next page.

At the same time, as shown in FIG. 3, the page number rlJ i 1st page write start address 0 is stored in the page accumulation management table in the RAM of the control unit 5.

Thereafter, the second to fourth pages are similarly stored in the memory 2 as shown in FIGS. 4(A) to 4(D).

FIGS. 5A to 5D show states of writing to the page accumulation management table.

As a result, as shown in Figure 3, the page storage management table stores that page 1 is stored at address 0, page 2 at address A, page 3 at address C, and page 4 at address D. Ru.

As described above, the control unit 5 stores the received image information in the memory 2.
When at least one page worth of image data is stored in the memory 2, the read start address is set to the top address of the memory 2 where that page is stored, and the decoder start signal, The print start signal is used to decode, record and reproduce the page.

FIG. 6 shows a time chart when image signals for four pages are received, there is no paper jam on the way, and the recording output is performed normally.

In addition, Fig. 7 shows that after the recording output of the second page is completed, the third
A time chart is shown when a jam is detected by the jam sensor when recording the page number.

Conventionally, a facsimile receiver interrupts reception when a jam occurs, but in the present invention, reception is not interrupted and the received pages continue to be stored in the memory 2.

In the example shown in FIG. 7, reception continues until the fourth page.

However, as shown in FIG. 7, the decoding and recording/reproduction of the received page is interrupted, and the jam sensor continues to be monitored until the jam is cleared.

On the other hand, if the jam is cleared, the control unit 5 decodes the information on the third and fourth pages on which recording was interrupted and records the information on the third page based on the accumulation management table shown in FIG. Specify the readout start address of the second page as address B, output decoding start and print start signals, and record the third page.

After reproducing, the read start address of the fourth page is designated as address C in the same manner, and the fourth page is recorded.

Play and end the operation.

Flowcharts illustrating control operations are shown in FIGS. 8 to 10.

FIG. 8 explains the entire control operation, and shows step S
At t, set the write start address to address 0,
In step S2, the reception start page is set to X, and this is set as the first page.

Then, in step S3, the recording start page is set to Y, and
Set this on page 1.

Subsequently, in steps 54 to S6, the working area (variable storage area) in the RAM in the control section 5 is initialized, and steps S7 and 58, which are record control and print control to be described later, are repeated to complete all control operations.

On the other hand, Figure 9 shows the record control step,
In step TI, it is determined whether to wait for page reception or to wait for page completion, and if it is to wait for page completion, step T2
If the receiving circuit detects an RTC signal in step T3, the page number At T6, a write stop address is set, and at step T7, the process waits for page reception, and returns to the original state.

On the other hand, in the case of waiting for page reception, when the receiving circuit detects the EOL signal in step T8, the state is set to wait for page end in step T9, and the original state is returned.

On the other hand, FIG. 10 explains a specific method of print control, and in step U1, it is determined whether the printer is waiting for printing to end, waiting for printing, or neither.

If the printer is waiting for printing to end, the occurrence of a jam is confirmed in step U2.

If a jam occurs, the print start signal becomes low level in step U3, the decoding start signal becomes low level in step U4, and step U5
The page to be printed is set as the second page, and the process returns to the original state.

On the other hand, if no jam has occurred in step U2, the process proceeds to step U6, where it is determined whether or not there is a signal that detects an RTC signal from the decoder. If there is, the process proceeds to step U7, where the print start signal is set to a low level. Then, in step U8, the decoding start signal is set to low level, and in step U9, Y in the RAM of the control unit 5 is set to low level.
The page is incremented by 1, and the print page is set to O in step U10 to return to the original state.

On the other hand, if printing is waiting in step Ul, the process advances to step Ull and it is determined whether or not page Y has been set in the accumulation management table. If it is not set, return to the original state, and if it is set, step U12
Proceeding to step U13, the storage start address of page Y is set to the readout start address, the print start signal is set to high level in step U14, the decoding start signal is set to high level in step U14, and the print page is set to page 1 in step U15, Return to the original.

In cases other than the above-mentioned cases, the process proceeds from step Ul to step U16, and it is determined whether or not the jam has been cleared. If the jam has not been cleared, the process returns to the original state, and if it has been cleared, the print page is set to O. Return to the original.

[Second Embodiment] FIGS. 11 to 13 illustrate a second embodiment of the present invention. In each figure, the same parts as in FIGS. 1 to 10 are given the same reference numerals, and their explanations will be is omitted.

In this embodiment, a structure is adopted in which the number of received pages that have not been printed and output is displayed at the time when a paper jam occurs.

In this embodiment, a display means 12 of a "Japanese" segment made up of LEDs is provided as a display means, and this is connected to the control section 5.

Of course, other display means may be used.

If such a structure is adopted, after the operator clears the jam, he or she can judge whether or not the remaining number of sheets of recording paper is sufficient to record and reproduce all the pages that have not yet been recorded or reproduced, which is extremely convenient for operation. is good.

FIG. 12 shows changes in control operation when configured in this way.

The difference between FIG. 12 and FIG. 10 is that step U2' is provided between steps U2 and U3 to display the difference between the page to be printed and the printed page, and step U16 is provided between step U16 and step U17. ' is added to clear the remaining page display, and if step U18 is set to display the remaining pages if the jam has not been cleared in step U16.

FIG. 13 shows a timing chart including the remaining page display step.

[Effects] As is clear from the above description, according to the present invention, a facsimile device having a function of storing received image signals in a memory in encoded compressed form is used, and reception problems caused by paper jams during reception can be avoided. The system uses a configuration that stores received images without interruption, and automatically records and plays back received images that have not yet been recorded and played back after the jam is cleared. There is no need to transmit the same image again, and communication costs can be reduced.

[Brief explanation of the drawing]

Figures 1 to 1O explain the first embodiment of the present invention. Figure 1 is a block diagram of the control circuit, and Figure 2 shows received data, the image storage range on memory, and the start address of each page. Figure 3 is an explanatory diagram of the accumulation management table, Figures 4 (A) to (D) and Figures 5 (A) to (D).
is an explanatory diagram showing the storage status of each page and first address in the memory and the writing status on the storage management table, Figure 6 is a timing chart of each signal in a state without a jam, and Figure 7 is a diagram when a jam occurs. FIG. 8 is a flowchart explaining the overall control, FIG. 9 is a flowchart explaining record control, FIG. 1O is a flowchart explaining print control, and FIGS. Fig. 13 explains the second embodiment of the present invention, Fig. 11 is a block diagram of the control circuit, Fig. 12 is a flowchart explaining print control, and Fig. 13 is a timing chart of each signal. be.

Claims (1)

[Claims] A memory for storing and accumulating received code-compressed image data, a decoding means for decoding the image data read from the memory, and a recording means for recording the decoded image data using cut paper. 1. A facsimile receiving device characterized in that the facsimile receiving device is configured to continue receiving image data even if a paper jam occurs during recording.