JPS63211966A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To prevent deviation which occurs in a recording picture in every other main scan by correcting initial data of an address pointer for reading and writing in a picture memory which temporarily stores having read picture data or picture data to be recorded for prescribed dots at the time of return scan. CONSTITUTION:A value in which a portion of common deviation correction betais added to initial data of return scan is set to the address pointer in a main scan direction, and then the switches 1 and 2 of a correction switch 30 are judged to be turned on or not. When the switch 1 is turned on '1' is reduced from the value of the address pointer, and if the switch 2 is turned on, '1' is added. When the initial value of the address pointer is corrected at the time of reading picture information from a line a memory B, the values of the address pointer is reduced one by one, while they are read by a string and are transmitted to a recording part 26b. Similarly reading from line memories A and B is alternately executed until the end of picture information hereafter, whereby the recording picture without deviation can be obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a facsimile device that reads or records using a transverse scanning (shuttle scanning) method, and particularly relates to a facsimile device that reads or records both forward and backward. It is related to.

[Conventional technology]

FIG. 4 is a perspective view showing a general transverse scanning type scanning mechanism. A carriage unit 3 in which a recording head 1 and a reading image sensor 2 are integrated is slidably fitted to carriage shafts 4 and 5. A wire rope 6 connected to the drive shaft of the main scanning motor 7 is attached to the carriage unit 3 via pulleys 14 to 17.
is driven in the main scanning direction, that is, the carriage shaft 4.
．． It reciprocates in the direction along 5. The recording head 1 and the reading image sensor 2 are each capable of simultaneously recording and reading a plurality of dots (for example, 32 dots) in the sub-scanning direction.

FIG. 5 is a schematic side view showing a state in which recording scanning is performed by this scanning mechanism. The recording paper 9 pulled out from the recording paper roll 12 is brought into contact with the recording paper guide 8 disposed parallel to the carriage shaft 4 while being moved to the roller 10.1.
1, it is sent upward. The recording head 1 is configured to move in the main scanning direction (vertical direction in FIG. 5) while pressing the recording paper 9 on the recording paper guide 8. Then, by alternately moving the recording head 1 in the main scanning direction and feeding the recording paper 9 in the sub-scanning direction, the recording head 1 moves toward the recording paper 9.
slide across the image area.

FIG. 6 is a perspective view showing how the recording head 1 slides across the image area of the recording paper 9 due to the relative movement between the recording paper 9 and the recording head 1. Print head 1 scans area 9
After sliding a from left to right (outward path), the recording paper 9 moves upward. This positions the recording head 1 at the right end of the scanning area 9b.

Then, the recording head 1 moves from right to left (return path) and slides in the scanning area 9b, and the recording paper 9 moves upward again.

By repeating similar operations, the recording head 1 will slide over the entire effective image area of the recording paper 9. A predetermined image is recorded on the recording paper 9 by performing dot recording according to the input image information while sliding the recording head 1 in this manner.

Although FIG. 6 relates to recording scanning, reading scanning is also similar to recording scanning, by moving the document in the sub-scanning direction along a predetermined path while reciprocating the carriage unit 3 in the main scanning direction. , it is possible to achieve reading of the entire manuscript.

Incidentally, in this type of scanning mechanism, a home position sensor 13 is provided at the start position of the "outward" main scan, that is, the outward scan, in order to specify the reference position for starting the main scan (see FIG. 4). In either scanning for reading or recording, the carriage unit 3 is first set at a reference position (indicated by a broken line in FIG. 4) based on the detection output of the home position sensor 13, and then performs forward scanning. The end point of the forward scan, that is, the starting point position of the backward scan can be found by counting the number of steps of the main scanning motor 7 from the start of the forward scan.

[Problem that the invention seeks to solve]

However, the relationship between the count value of the main scanning motor 7 and the actual position of the carriage unit 3 deviates between forward scanning and backward scanning. This is mainly due to the effect of the elongation of the wire rope 6 that pulls the carriage unit 3. If recording scanning is performed while ignoring this deviation, an image as shown in FIG. 7(a) will not originally be recorded. However, as shown in FIG. 6(b), the recorded image shifts every other main scan.

For the same reason, a shift between the forward scanning and the backward scanning also occurs in the reading scan, and if this is left unaddressed, a shift will occur in the image to be transmitted. That is, if the number of lines that can be read in one reading scan is 32, the image to be transmitted will shift in the main scanning direction every 32 lines.

[Means for solving problems]

The facsimile apparatus of the present invention has been developed in view of the above-mentioned problems, and uses the initial data of the read or write address pointer in the image memory that temporarily stores read image data or image data to be recorded during backward scanning. Sometimes, it is corrected by a predetermined amount of dots.

[Effect]

By correcting the initial data of the write or read address pointer in the image memory related to the backward scan, the image information read from the image memory is shifted in the main scanning direction, and this shift occurs during the backward scan due to mechanical reasons. Offset the deviation in direction.

〔Example〕

Hereinafter, the present invention will be described in detail along with examples.

FIG. 2 is a block diagram of a facsimile machine that is an embodiment of the present invention. First, the basic image processing operation during reception will be explained. The image information received from line 32 is sent to the NCU
20, is demodulated by the modem 21, and is sent to the communication control unit 22.
The data is then input to the information decompression section 24b of the information compression and decompression section 24 via the buffer 23. The image information restored to raw data by the information restoration section 24b (well, after being once written to the image memory 25, the recording method of the recording section 26b, that is, the reciprocating recording scanning explained using FIGS. 4 to 6) The image is read out according to the method and recorded in the recording unit 26b.The image memory 25 stores the number of dots in the effective main scanning width as
Assuming 64 dots, (1664+2α) dots x 3
It is equipped with two line memories that can store two lines of image information, and when writing to line memory A, reading from line memory B is performed, and conversely, writing to line memory B is performed. At times, read/write is performed alternately, such as reading from line memory A. Note that line memory A is a memory for forward scanning, and line memory B is a memory for backward scanning.

Next, basic image processing operations during transmission will be explained. The image information read by the reading section 26a is binarized and written to the image memory 25. At this time, the forward scan (3
Image information read by 2-line simultaneous reading) is written to line memory A, and image information read by backward scanning (32-line simultaneous reading) is written to line memory B.

Reading from line memories A and B is performed alternately in the same way as during reception; when writing to line memory A, reading from line memory B is performed, and conversely, when writing to line memory B, reading from line memory B is performed alternately. Memory A
Reads out. Note that reading here is performed in line order as described later. The image information read from the image memory 25 has redundancy suppressed in the information compression section 24a, and is sent to the modem 2 via the buffer 23 and the communication control section 22.
1 and sent out to the line 32 through the NCU 20.

Note that the overall control of such image information processing is performed by the CP
This is performed by the control unit 27, which is composed of U, ROM, and RAM. The panel section 28 is equipped with various switches and a display section, and the mechanism control section 29 is equipped with main scanning and sub-scanning drive sections in the reading/recording section 26, a sensor section for position detection, etc. It is something that Also,
The correction switch 30 is for correcting the initial data set in the address pointer when reading image information from the image memory 25, and is composed of two DIP switches in this embodiment. 31 is a data bus.

Next, the operation of reading out image information from the image memory 25 at the time of reception, that is, the time of image recording, is explained in FIGS. 1 and 3.
This will be explained using figures. Figure 1 is a flowchart,
FIG. 3 (al (b)) shows the line memory A and the line memory A, respectively.
The image information stored in B is expanded in a diagram so that it can be visually recognized, and shows the situation when image information as shown in FIG. 7(a) is sent from the other party.

As mentioned above, line memories A and B are (1664+2
It has a capacity that can store pixels for α) bits x 32 lines, and the received image information is stored in such a way that a spare area of α bits is left on each side in the main scanning direction, as shown in Figure 3 (a) and (b). written.

When the writing of the image information as shown in Fig. 3 (al) in line memory A is completed, the image information shown in Fig. 3 (al) is subsequently transferred to line memory B (Fig.
At the same time as writing of the image information shown in b) starts, reading from the line memory A starts. At this time, reading is performed column by column in the column direction (sub-scanning direction) in accordance with the recording scanning method.

When reading from line memory A, after setting the value α+1 as initial data to the address pointer in the main scanning direction (step 1o9) as determined in step 101 of FIG. 1, the value of the address pointer is sequentially read. The effective range bone (
The image information (1664 dots x 32 lines) is read out (step 107).

When reading from line memory A is completed, writing of image information to line memory B is also completed, and reading from line memory B is subsequently performed. Reading from line memory B is carried out column by column in the same way as reading from line memory A, but since it is necessary to read as a backward scan, reading from line memory B is performed from the right column to the left column in bl (Fig. 3). In other words, in principle, set the initial data (1664+α), which is the rightmost address of the effective image, in the address pointer in the main scanning direction, and read out one column at a time while decreasing this value by 1. Just go.

However, if the read image information is recorded as is based on this principle, the recorded image will be shifted due to the influence of the elongation of the wire rope 6.

Therefore, in this embodiment, the value of the initial data initially set in the address pointer is corrected so that the deviation of the recorded image is offset. The correction values are divided into common deviation correction bones and individual deviation correction bones. The common deviation correction bone is set as a constant β in the ROM, and the individual deviation correction bone is set for each device by the correction switch 30. In this embodiment, the individual deviation correction bone can be corrected by +1 bit, and when the correction switch 30 is set to "on", -1 bit can be corrected.
When the bit and correction switch 30 is set to "on", +1 bit correction is performed.

Next, this correction procedure will be explained using the flowchart of FIG. When it is determined that image information is to be read from line memory B (step 101), the value obtained by adding the common misalignment correction bone β to the initial data of the backward scan (1664+α), that is, (1663+α+β)
is set as an address pointer in the main scanning direction (step 102). Next, it is determined whether or not the switch ■ of the correction switch 30 is "on" (step 103), "r on".
If so, 1 is subtracted from the value of the address pointer (step 104). Next, switch ■ of the correction switch 30
It is determined whether r is "on" or not (step 105), and if r is "on", 1 is added to the value of the address pointer (step 106).

Therefore, if all switches ■■ are "on" or "off", individual deviation correction is not performed and the first value of the address pointer is (
1663+α+β).

In this way, once the initial value of the address pointer has been corrected when reading image information from line memory B,
From then on, decrease the value of the address pointer by 1, and
Read out each column (32 dots) (step 10)
7), and send it to the recording section 26b.

When reading from line memory B is completed, image information corresponding to the third main scan (forward scan) has been written to line memory A, and reading from line memory A is performed as described above. Thereafter, in the same way, line memories A and B
By alternately reading out the image information until the end of the image information, a recorded image without deviation can be obtained (step 108).

Next, the operation of reading image information from the image memory 25 at the time of transmission, ie, image reading, will be described.

Among the image information read by the reading unit 26a, the image information read in the backward scan has already shifted in the main scanning direction due to the elongation of the wire rope 6.

That is, the image information written in line memory B is shifted in the main scanning direction. This amount of deviation is the same as the amount of deviation when recording is performed without performing answer correction during image recording.

Therefore, even during transmission, by shifting the initial value of the address pointer when reading image information from line memory B, it is possible to obtain image information without deviation.

Note that reading at the time of transmission is from line memory A.

In both line memories A and B, the initial data is α+1 because each line is read out line by line from left to right in the row direction, that is, in the main scanning direction. The correction procedure is as shown in the flowchart of FIG. 1, so it will be omitted here.

In this embodiment, a dedicated correction switch 3o is used as a means for setting the individual deviation correction bone, but other data manual means such as a numeric keypad manual device may be used.

Further, in this embodiment, the deviation is corrected when reading data into the line memories A and B, but the deviation may be corrected when writing.

Furthermore, although the individual deviation correction bone of this embodiment can only correct ±1 dot, it is not limited to this value, and the correction adjustment range can be expanded as necessary.

Further, in this embodiment, gears are not used in the main scanning drive system, but if gears are used, deviations occur not only due to elongation of the wire rope but also due to backlash of the gears.

However, the present invention can correct the deviation regardless of the cause.

〔Effect of the invention〕

As explained above, according to the horizontal scanning type facsimile apparatus of the present invention, the initial data of the writing or reading address pointer in the image memory is corrected in the backward scanning, and the image information read from the image memory is actively moved in the main scanning direction. Therefore, the deviation in the main scanning direction that occurs during backward scanning due to mechanical reasons can be offset, and image recording without deviation and image transmission without deviation can be performed.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing a process of reading image information from an image memory in a facsimile machine according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of the facsimile machine according to this embodiment, and FIG. Example image memory 2
A diagram showing the image storage state of line memories A and B in 5,
Fig. 4 is a perspective view showing a general transverse scanning mechanism, Fig. 5 is a side view showing the recording operation in transverse scanning, Fig. 6 is a conceptual perspective view showing the transverse scanning operation, and Fig. 7 is transverse scanning. FIG. 3 is a plan view showing a specific example of recording. 25... Image memory, 26... Reading/recording scanning section,
27... Control unit, 29... Mechanism control unit, 30...
correction switch. Patent applicant: Tamura Electric Manufacturing Co., Ltd. NEC Corporation

Claims (1)

[Claims] In a facsimile machine that performs reciprocating reading or reciprocating recording using a transverse scanning method, initial data of a read or write address pointer in an image memory that temporarily stores read image data or image data to be recorded is specified during backward scanning. A facsimile machine characterized by dot correction.