JPS6029256Y2 - Sub-scanning line density switching device for flat scanning facsimile, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sub-scanning line density switching device for use in flat scanning facsimiles, etc., which can arbitrarily switch the sub-scanning line density.

When switching the sub-scanning line density in a conventional plane scanning facsimile, various additional devices such as a gear via an electromagnetic clutch are used to switch the sub-scanning line density.

In this case, the mechanism is complicated and a large load is required to turn on and off the electromagnetic clutch during high speed rotation.

The present invention uses a pulse motor as a sub-scan driving means in a plane scanning facsimile, etc., and applies a predetermined number of step pulses to this pulse motor every main scanning period, thereby improving the conventional variable scanning method. It is an object of the present invention to provide a sub-scanning line density switching device for a plane scanning facsimile machine, etc., which is capable of scanning at an arbitrary sub-scanning line density even in devices having different processing speeds for one line.

The present invention will be explained below based on the drawings.

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, and FIG. 2 is a waveform diagram illustrating its operation.

The rotational driving force of the pulse motor 1 operated by the input pulse is from the pulley 2 → timing belt 3 → boo IJ 4
→Transmitted to roller 5.

The roller 5 rotates together with the driven roller 6 at a predetermined sub-scanning line density, and feeds the paper 7 (transmission document in the transmitter, received recording paper in the receiver) in steps.

Here, the sub-scanning line density can be easily switched by arbitrarily setting the number of pulses applied to the pulse motor 1.

In other words, in the case of a facsimile transmitter, when the operator looks at the document to be sent by facsimile, and if the document has small characters or dense document content, or if the operator wants to reproduce the document content most faithfully, In order to improve the quality (high resolution) of the received image reproduced by the facsimile receiver, the sub-scanning line density is set to 81/rrrm, for example.

On the other hand, if the original to be sent has relatively large characters or rough original content, the facsimile communication time can be shortened even if the quality of the received recorded image played back by the facsimile receiver is improved to some extent. In order to read and scan at the sub-scanning line density, the sub-scanning line density of the transmitted document should be set to 4//mm.
If the operator sets this, it will be possible to send a facsimile in about half the time it takes to send a facsimile.

This specification of the sub-scanning line density is performed before the start of reading scan or recording scan, that is, before the start of communication.

Once the sub-scanning line density is specified, the specified sub-scanning line density is held for at least one copy, that is, until this specification is canceled.

Then, the sub-scanning line density information specified on the transmitting side is transmitted in the transmission control procedure.

On the receiving side, when the sub-scanning line density information is received, the number of pulses applied to the pulse motor is limited, that is, set to a predetermined number in accordance with the recording scan command signal, and recording scanning is performed to adjust the sub-scanning line density between the transmitter and the receiver. Match.

Next, the operation on the transmitter side will be explained.

First, when it is desired to perform scanning at a sub-scanning line density of 81/rrvn, a scanning command signal (FIG. 2b) is applied from the input terminal 8 to the monostable multi-bi break 9 to operate it.

The output pulse width of the monostable multivibrator 9 is determined by the sub-scanning line density designation circuit 1 in advance by the operator, for example.
Specified by 0.

Here, if the roller 5 is set to rotate 1/8 mm when one pulse is applied to the pulse motor 1, then the output pulse width of the monostable multivibrator 9 is the period generated by the pulse oscillator 11. Pulse (Figure 2g)
The time width of one pulse is set to pulse □ (FIG. 2C).

The re-outputs from the monostable multivibrator 9 and pulse oscillator 11 are applied to the AND gate circuit 12, and the output (second
Figure d) is applied to the pulse motor 1 to rotate the pulse motor 1 by one step, and the desired line width (in this case, 1/
The roller 5 rotates by 8 mm), and at the same time, one line of the paper 7 (transmission original) is scanned during the transmission scanning signal (FIG. 2e).

By repeatedly scanning each line in this manner, one sheet of paper 7 is fed at a sub-scanning line density of 8 l/yvn.

In addition, 13 is a correction circuit which converts the periodic pulse of the pulse oscillator 11 (Fig. 2g) and the scanning command signal (second
This is for correcting to an arbitrary width when the width of the output signal of the AND gate circuit 12 is smaller than the desired width when the rise or fall does not match with the width shown in FIG.

Next, in the above structure, the sub-scanning line density is 4t)/rrrIrL
When performing scanning, the pulse width of the output of the monostable multi-bi break 9 (Fig.
is specified to have a time width of two pulses of the periodic pulse of the pulse oscillator 11 (FIG. 2g).

Then, the periodic pulse of the pulse oscillator 11 (Fig. 2g) and the output signal of the monostable multivibrator 9 (Fig. 2g) are applied to the AND gate circuit 12, and an output signal having two pulses (Fig. 2h) is applied. Operate pulse motor 1 and roll roller 5 for 2 lines (178mm x 2 pulses = 1/4mm
; 41 /yIrIrL) and at the same time between the transmission scanning signal (Fig. 2 i)
By performing line reading scanning, the sub-scanning line density is 4
Send one sheet of paper 7 at 1/rmn.

Note that the time point at which reading scanning of the transmitted document is started between the transmission scanning signals (FIGS. 2e and 2i) is the output pulse of the AND gate circuit 12 (FIGS. 2d and 2i) as shown in the figure. It may be a rise as shown in Fig. 2 h) or a fall.

Furthermore, the present invention is not limited to the above-mentioned configuration; for example, as shown in FIG. A similar effect can be obtained even with a circuit composed of the counting circuit 25.

In other words, as mentioned above, when one pulse is applied to the pulse motor (not shown), the roller (not shown) moves by 178 mm.
is set to rotate, the scan command signal (
Fig. 4 k) from the input terminal 22 to the flip-flop circuit 2
Apply to 3 and set.

The output signal of this flip-flop circuit 23 (Fig. 4 1)
and a periodic pulse (FIG. 4j) from the pulse oscillator 21 are applied to the AND gate circuit 24, and a logical product is obtained.

The output signal of the AND gate circuit 24 (Fig. 4 m) is
The pulses are applied to the counting circuit 25, and when the desired number of pulses is counted, the flip-flop circuit 23 is turned on.

Note that the number of pulses to be counted in the counting circuit 25 is set by the sub-scanning line density designation circuit 20, and the sub-scanning line density designation circuit 20 can be set to a desired sub-scanning line density by the operator, for example. is set to .

When the desired number of pulses is 22, the counting circuit 25 counts one pulse, and the output signal of the AND gate circuit 24 (Fig. 4m) is applied to a pulse motor (not shown) which is the same sub-scanning driving means as described above. applied to rel.

Here, one pulse is applied to the pulse motor to move the sub-scanning means such as a roller which is interlocked with the pulse motor to 11877.
I77! (118rIrIft x 1 pulse = 1/8m
m; 81/rran) advance.

Next, a case will be described in which two pulses are applied to the two-pulse motor to advance the sub-scanning means 114.

The scanning command signal (n in FIG. 4) is applied from the input terminal 22 to the flip-flop circuit 23, and its output signal (0 in FIG. 4) is applied to the AND gate circuit 24 together with the periodic pulse of the pulse oscillator 21 (j in FIG. 4). applied to.

The counting circuit 25 counts two when the desired number of pulses is set by the linear density specifying circuit 20, and resets the flip-flop circuit 23.

The output signal of the AND gate circuit 24 during this time (Fig. 4 p)
is applied to the pulse motor (1/8 mm
The sub-scanning line density is X2 pulse = 1/4 mm; 41/rtam).

Furthermore, the rise or fall of the periodic pulse of the pulse oscillator 21 (FIG. 4 j) and the scanning command signal (FIG. 4 or FIG. 4 n) do not match, and the output signal width of the AND gate circuit 24 does not match the desired width. Since this may occur, it is better to provide a function to ignore the first pulse applied to the counting circuit 25.

The sub-scanning line density switching device described above can also be applied to a plane scanning facsimile machine that employs band compression technology and uses a pulse motor as the sub-scanning drive means.

In flat scanning facsimile machines that employ this band compression technology, the main scanning time (reading scanning time; recording scanning time) is generally constant, but the band compression processing time for each line (one main scanning period = 1 scanning command signal period), but by using this invention together,
As long as the scanning command signal for the next line is sent after line processing, the paper is sub-scanned at the specified sub-scanning line density, so it can be applied to such an apparatus without any particular modification.

Therefore, in such a case, the facsimile communication time can be further shortened by the operator simply pressing an operation button that designates a coarse sub-scanning line density while taking into consideration the received image quality.

Although the embodiment has been described in which 1 pulse is applied when the sub-scanning line density Be/rrvn and 2 pulses are applied when 4t)/TllIn, the number of applied pulses is not limited to this, and for example, 3 pulses are applied. 2.66/ after applying pulse
It is also possible to create an even coarser sub-scanning line density, such as /kaku.

In addition, as a countermeasure against feeding unevenness, 2 pulses are applied when the sub-scanning line density is 81/wIt, 4 pulses are applied when the sub-scanning line density is 42/wIt, and 2.66
The number of pulses may be set to 6 pulses when //mm.

That is, a predetermined sub-scanning line density can be obtained by setting the number of pulses to be an integral multiple of the number of pulses applied at the maximum sub-scanning line density.

Furthermore, in the present invention, a similar driving pulse may be created by applying a scanning command signal to a monostable multivibrator, without using periodic pulses generated from a pulse oscillator as shown in the embodiment. Of course.

As described above, the present invention allows the operator to check the contents of the original to be sent in advance, and
++s) or coarse sub-scanning line density, and then select the sub-scanning line density designation button (switch) on the operation panel. Since sub-scanning is performed, scanning time can be made more efficient, and facsimile communication time can be reasonably shortened.

[Brief explanation of drawings]

Fig. 1 is an electrical circuit diagram of a linear density switching device according to one embodiment of the present invention, Fig. 2 is a signal waveform diagram showing its operation, Fig. 3 is an electrical circuit diagram of another embodiment, and Fig. 4 is the same. FIG. 3 is a signal waveform diagram showing the operation. 1...Pulse motor, 5...Roller,
7...paper, 8,22...input terminal,
11.21...Pulse oscillator, 9...
Monostable multivibrator, 10.20... Linear density specification circuit, 12, 24... AND gate circuit, 13... Correction circuit, 23... Flip-flop 25... Counting circuit.

Claims (1)

[Scope of utility model registration request] A sub-scanning line density specifying means for specifying the sub-scanning line density, a pulse motor for feeding the paper in the sub-scanning direction, a pulse generating means for generating pulses for driving the pulse motor, and a scanning command that is outputted every scanning period. pulse passing means that is started by a signal and passes the pulse by setting a time width according to the output of the sub-scanning line density specifying means, and the sub-scanning line density specifying means sets the sub-scanning line density to a maximum sub-scanning line density. When specified, at least one pulse is inputted from the pulse generating means to the pulse motor by a scanning command signal outputted every main scanning period, and the sub-scanning line density specifying means is set to perform sub-scanning at a sub-scanning line density below the maximum sub-scanning line density. A sub-scanner in a plane scanning facsimile or the like, characterized in that when a linear density is specified, the scanning command signal causes the pulse generating means to inject pulses of an integral multiple of the number applied when specifying the highest sub-scanning linear density into the pulse motor. Scanning line density switching device.