JP3249197B2 - Facsimile machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus, and more particularly, to a facsimile apparatus capable of carrying a recording sheet with sufficient accuracy in consideration of a change in load depending on a recording sheet size.

[0002]

2. Description of the Related Art A conventional facsimile apparatus is disclosed, for example, in Japanese Patent Application Laid-Open No. 2-220561. Here, the current applied to the motor at the time of recording paper switching is estimated to increase when the motor load increases. Since it is configured to be large, there is an advantage that step-out can be prevented.

Further, in a facsimile apparatus reported in Japanese Patent Application Laid-Open No. Hei 3-203670, in a facsimile apparatus using a thermal recording paper having a small width due to the entire width of a thermal head and a platen roller, a portion of the facsimile apparatus which comes into contact with the recording paper is a platen. The friction coefficient of the platen surface is reduced at the part that is in direct contact with the thermal head while the friction coefficient of the surface is increased, preventing motor torque shortage due to direct friction between the thermal head and the platen roller. However, there is an advantage that the received image information can be printed and recorded accurately.

In a conventional facsimile apparatus which has two roll-shaped recording papers and is used by switching as needed, the load applied to the motor varies depending on the size of the recording paper. Examples of such a case include a case where a B4 size roll-shaped recording paper is used and a case where an A4 size recording paper is used. In addition, it is sufficiently considered that a setting in which the number of rolls of the roll paper when setting the recording paper is significantly different from that of the other roll is tried. In consideration of such a case, the motor is operated in the following two cases. The load changes.

When the motor is rotating at a specified speed, the friction load is generally considered to be the back tension of the recording paper, the friction of the recording paper transport system, and the friction of the gear train.
When the weight and the shape of the roll-shaped recording paper are different, it is expected that the back tension of the recording paper changes and the frictional load changes. At the time of starting the motor, generally, a friction load and a starting torque at the time of rotation at a specified speed are considered as a motor load. This start-up torque is mainly generated by the inertial load (inertia) of the roll-shaped recording paper, but this inertial load also differs when the mass and shape of the roll-shaped recording paper are different. For this reason, it is expected that the friction load at the time of startup will differ.

Next, in a conventional facsimile apparatus which uses two types of roll-shaped recording paper by switching according to received information,
Even when the recording paper size and roll diameter are different from each other,
The recording paper is transported under the same conditions.

[0007]

However, in the above-described conventional facsimile apparatus, since the motor load differs depending on the roll paper as described above, the recording paper feed with sufficient accuracy can be performed by driving the motor under the same conditions. Cannot be performed, and there is a problem that it is difficult to print a good image, for example, an image abnormality such as a white streak and a black streak is caused.

Further, for example, when the driving of the motor is set under the condition where the load is large, there is a problem that image abnormality, noise, heat generation and increase in power consumption caused by uneven feeding of the recording paper due to over torque are caused. . Therefore, according to the present invention, it is possible to convey the recording paper with sufficient accuracy in consideration of a change in load due to the recording paper size, and it is possible to print a good image without causing image abnormality such as white streaks and black streaks. It is another object of the present invention to provide a facsimile apparatus capable of suppressing a reduction in power consumption, noise, vibration, and heat generation by eliminating recording paper feeding unevenness.

[0009]

According to the first aspect of the present invention,
Two roll-shaped recording papers having different sizes, a recording paper transport roller for transporting the roll-shaped recording paper, and an image formed on the roll-shaped recording paper which is in contact with the transport roller and is supplied between the transport rollers. an image recording means for recording a first recording sheet conveyance means for conveying the one of the two said rolled recording paper having different sizes between the conveying roller and the image recording means, the size
A second recording paper transporting means for transporting the other of the two rolled recording papers between the transporting roller and the image recording means, and a forward and reverse rotation of the transporting roller and the first and second recording papers. A facsimile apparatus having a driving stepping motor for driving the recording paper transport means and transporting the rolled recording paper in the reverse direction toward the first and second recording paper transport means. Current control means for controlling the exciting current of the stepping motor based on an exciting current value predetermined in the system by the size is provided .

[0010] claimed invention in claim 2 is referenced read through up-les slew-up rate defined in advance system based on the excitation current value of the stepping motor
And over preparative table, and characterized by providing a through-up means for performing through-up by reference to slew up rate read in the through up-rating table.

According to the third aspect of the present invention, two different sizes are used.
A plurality of roll-shaped recording papers, a recording paper transport roller for transporting the roll-shaped recording paper, and an image for recording an image on the roll-shaped recording paper that is in contact with the transport roller and that is supplied between the transport rollers and recording means, the size of different two first and the recording paper conveying means, two of the rolled recording paper of different sizes for transporting one of the rolled recording paper between the conveying roller and the image recording unit A second recording paper transporting means for transporting the other between the transporting roller and the image recording means, forward and reverse rotation to drive the transporting roller and the first and second recording paper transporting means, and In a facsimile apparatus having a driving stepping motor for transporting rolled recording paper in the reverse direction toward the first and second recording paper transporting means, the driving speed of the stepping motor is changed according to the size of the recording paper used. Speed change And means, and providing a pulse control means for controlling the excitation pulses of the stepping motor based on the excitation current value determined in advance system based on the driving speed.

According to a fourth aspect of the present invention, the system is determined in advance based on the driving speed of the stepping motor.
Surua' be read with reference to the through-up pulse rate
Pulse rate table and the through-up pulse rate
Refers to the door table read through up Pal thread
And a through-up means for performing a through-up by a port .

[0013]

According to the first aspect of the present invention, the exciting current of the stepping motor can be controlled based on the exciting current value predetermined by the system according to the size of the recording paper used. Therefore, it is possible to convey the recording paper with sufficient accuracy in consideration of a change in load depending on the recording paper size ,
In addition to being able to print good images without causing image abnormalities such as white and black streaks, there is no unevenness in the feeding of recording paper.
To reduce power consumption, noise, vibration and heat generation.
Can be .

According to a second aspect of the present invention, in the first aspect of the present invention, the slew-up time read out with reference to a slew-up time table determined in advance based on the driving current value of the stepping motor. It can be performed. For this reason, in addition to obtaining the effect of the above-described claim 1, in particular, it is possible to suppress image abnormality at the time of starting the motor.

According to the third aspect of the present invention, the driving speed of the stepping motor is changed based on the size of the recording paper to be used, and based on the driving speed, the driving current of the stepping motor is determined based on a driving current value predetermined in the system. The excitation pulse can be controlled. For this reason, the recording paper can be conveyed with sufficient accuracy in consideration of the change in the driving speed, so that a good image can be printed without causing image abnormality such as white stripes and black stripes. Can be eliminated, so that a reduction in power consumption, noise, vibration and heat generation due to the recording paper feeding unevenness can be suppressed.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the slew-up time read out by referring to a slew-up time predetermined by the system based on the driving speed of the stepping motor is determined. It can be carried out. For this reason, in addition to obtaining the effect of the invention described in claim 3, it is possible to suppress image abnormalities particularly at the time of starting the motor.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. Embodiment 1 FIG. 1 is a block diagram showing a configuration of a facsimile apparatus according to Embodiment 1 of the present invention (claim 1). In this embodiment,
The configuration is almost the same as that used in a normal facsimile machine. In FIG. 1, reference numerals 1 to 3 denote a current value table, a stepping motor control unit, and a display unit, respectively.
Reference numeral 6 denotes an information compression / decompression unit, a CPU, and a recording paper detection sensor. Reference numerals 7 to 10 denote an operation unit, a recording unit control unit, a communication control unit, and a system bus.

Next, FIG. 2 is a diagram showing a structure according to the first embodiment of the present invention.
FIG. 2 is a diagram illustrating a configuration of a recording system and a transport system in a facsimile apparatus using a plurality of roll-shaped recording sheets. In the facsimile apparatus of the present embodiment, two roll-shaped recording papers 21 and 22 are accommodated, and the roll-shaped recording paper 21 of the two roll-shaped recording papers 21 and 22 is transmitted to the first transport unit 30. The recording paper 22 is conveyed in the direction of a platen roller 25 by a feed roller 23 and a pressure roller 24, which constitute a roll roller.
Feed roller 27 constituting second transport means 31 through 26
The sheet is conveyed in the direction of the platen roller 25 by the pressure roller 28. Next, a thermal head (recording head) 29 is brought into contact with the platen roller 25. The thermal head 29 has a thermal element, and the roll-shaped recording paper 21 supplied between the platen roller 25 and the platen roller 25 by heat generated by the thermal element. Alternatively, an image is recorded on the roll-shaped recording paper 22. Note that the platen roller 25 and the first and second transport units 30 and 31
And a driving stepping motor for driving the recording papers 21 and 22 in the opposite directions toward the first and second conveying means 30 and 31, respectively.

Such a so-called double roll facsimile is produced for the purpose of outputting image information by using a recording sheet adapted to the size of the original document of the transmission source. For this reason,
Usually, as the roll-shaped recording paper 21 and the roll-shaped recording paper 22, a recording paper having a size different from that of the roll-shaped recording paper is often used. Next, as a control flow, the recording paper selection unit (not shown in FIG. 1) determines the recording paper to be used in the initial protocol transfer unit at the time of an incoming call, and then determines a current value table corresponding to the size of the recording paper. 1 and the current value information read out from the current value table 1 is transferred to the stepping motor control unit 2. Then, during this reception, the stepping motor is driven using the current value. With respect to the current value table 1, optimal conditions are determined at the design stage for recording paper that is assumed to be actually used, and supplied in the form of a ROM.

As described above, in this embodiment, the exciting current of the stepping motor can be controlled based on the exciting current value predetermined by the system according to the size of the recording paper used. For this reason, the recording paper can be conveyed with sufficient accuracy in consideration of a change in load depending on the recording paper size, so that a good image can be printed without causing image abnormalities such as white streaks and black streaks. Since the unevenness of the recording paper feed can be eliminated, it is possible to suppress a decrease in power consumption, noise, vibration and heat generation due to the unevenness of the recording paper feed.

(Embodiment 2) Normally, when a stepping motor is used as a drive source of a recording section of a facsimile apparatus having a thermal recording system, through-up is often performed. Therefore, in the present embodiment, as shown in FIG. 3, a low-period pulse is used at the time of starting the motor, the effective current value applied to the motor is increased, and a large torque is taken out from the motor at the time of startup where acceleration torque is applied. Thus, stable paper feed is performed from the beginning of recording. Since the optimum value of the through-up pulse rate changes according to the current value and the load, it is desirable to set the slew-up pulse rate based on the motor applied current value.

FIG. 4 is a block diagram showing the configuration of a facsimile apparatus according to a second embodiment of the present invention (claim 2). 4, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. Although the present embodiment is not much different from the configuration normally used in a facsimile machine, a through-up table 41 and a current value table 1 are further added, and a through-up table 41 is further added to the first embodiment. . In this embodiment, the recording system and the transport system are the same as those in the first embodiment shown in FIG.
Therefore, the description is omitted.

Next, as a control flow, a recording paper selection unit (not shown in FIG. 4) determines a recording paper to be used in the initial protocol transfer unit at the time of an incoming call, and then corresponds to the size of the recording paper. The current value is read from the current value table 1, the through-up rate is read from the through-up table 41, and the information on the current value and the through-up rate is passed to the stepping motor control unit 2. Then, during this reception, the stepping motor is driven using the current value and the slew-up rate. With respect to the current value table and the through-up rate, optimal conditions are determined at the design stage for recording paper that is assumed to be actually used, and supplied in the form of a ROM.

As described above, in the present embodiment, the slew-up time read out with reference to the slew-up time table predetermined by the system based on the drive current value of the stepping motor can be performed.
In addition to obtaining the effects of the first embodiment, it is possible to suppress image abnormalities particularly when the motor is started.

Third Embodiment FIG. 5 is a block diagram showing a configuration of a facsimile apparatus according to a third embodiment of the present invention (claim 3). The present embodiment has a configuration that is substantially the same as that used in a normal facsimile machine. 5, FIG. 1 designate the same or corresponding parts.

[0026] From usually facsimile apparatus in the sub-scanning direction of the linear density problems, it is necessary to change the conveyance amount of the recording paper per unit time in accordance with the received information, changing the driving speed of the stepping motor as a driving source and often it is. Therefore, in the present embodiment, in the case of such a double roll facsimile, the drive speed is switched so as to obtain an optimum paper feed value according to the type of recording paper to be used, and at this time, the current value according to the drive speed is changed. By using this, the paper feeding accuracy is further improved. In this embodiment, the recording system and the transport system are the same as those in the first embodiment shown in FIG.

Next, as a control flow, a current value corresponding to the drive speed is read from the current value table 1 from the current value table 1 when the drive speed arbitrarily set in the system is changed. The read current value information corresponding to the drive speed is transferred to the stepping motor control unit 2. Then, during this reception, the stepping motor is driven using the current value. With regard to the current value table 1, optimum conditions are determined at the setting stage for recording paper which is assumed to be actually used, and supplied in the form of a ROM.

As described above, in this embodiment, the driving speed of the stepping motor is changed based on the condition of the size of the recording paper to be used, and based on the driving speed, the stepping motor is driven based on the driving current value predetermined in the system. The excitation pulse of the motor can be controlled. For this reason, the recording paper can be conveyed with sufficient accuracy in consideration of the change in the driving speed, so that a good image can be printed without causing image abnormality such as white stripes and black stripes. Can be eliminated, so that a reduction in power consumption, noise, vibration and heat generation due to the recording paper feeding unevenness can be suppressed.

(Embodiment 4) Next, when a normal stepping motor is used as a drive source of a recording section of a facsimile apparatus having a thermal recording system, through-up is often performed. Therefore, in the present embodiment, a low-period pulse is used at the start of the motor, the effective current value applied to the motor is increased, and a large torque is taken out from the motor at the time of startup where acceleration torque is applied, as in the second embodiment of FIG. Thus, stable paper feed is performed from the beginning of recording. Since the optimum value of the through-up pulse rate changes according to the current value and the load, it is desirable to set the slew-up pulse rate based on the motor applied current value.

FIG. 6 is a block diagram showing a configuration of a facsimile apparatus according to a fourth embodiment of the present invention (claim 4). 6, FIG. 5 designate the same or corresponding parts. In this embodiment, a through-up table 41 and a current value table 1 are further added, and the through-up table 41 is further added to the third embodiment without much difference from the configuration used in a normal facsimile machine. In this embodiment, the recording system and the transport system are the same as those in the first embodiment shown in FIG.
Therefore, the description is omitted.

Next, the control flow is as follows. When the driving speed is arbitrarily set in advance in the system, the current value corresponding to the driving speed is changed from the current value table to the current value table 1.
And the through-up rate is read out from the through-up table 41, and the current value and the information on the through-up rate are transferred to the stepping motor control unit 2. Then, during this reception, the stepping motor is driven using the current value. With respect to the current value table and the through-up rate, optimal conditions are determined at the design stage for recording paper that is assumed to be actually used, and supplied in the form of a ROM.

As described above, in this embodiment, it is possible to perform the read-up slew-up time by referring to the slew-up time predetermined by the system based on the driving speed of the stepping motor. In addition to obtaining the effects of Example 3, it is possible to suppress image abnormalities particularly when the motor is started.

[0033]

According to the present invention, the recording paper can be conveyed with sufficient accuracy in consideration of the change in load depending on the recording paper size, and a good image can be formed without causing image abnormality such as white stripes and black stripes. In addition to the above, there is an effect that the power consumption can be reduced and noise, vibration and heat generation can be suppressed by eliminating recording paper feeding unevenness.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a facsimile apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a recording system and a transport system in a facsimile apparatus using two roll-shaped recording papers according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a low-period pulse at the time of motor startup according to a second embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration of a facsimile apparatus according to a second embodiment of the present invention.

FIG. 5 is a block diagram illustrating a configuration of a facsimile apparatus according to a third embodiment of the present invention.

FIG. 6 is a block diagram illustrating a configuration of a facsimile apparatus according to a fourth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 current value table 2 stepping motor control unit 3 display unit 4 information compression / expansion unit 5 CPU 6 recording paper detection sensor 7 operation unit 8 recording unit control unit 9 communication control unit 10 system bus 21, 22 roll recording paper 23, 27 feed Roller 24, 28 Pressure roller 25 Platen roller 26 Turn roller 29 Thermal head 30 First transport means 31 Second transport means 41 Through-up table

Claims (4)

(57) [Claims] 1. A roll of recording paper having two different sizes, a recording paper transport roller for transporting the roll of recording paper,
An image recording unit that abuts on the transport roller and records an image on the roll-shaped recording paper supplied between the transport rollers; and one of the two roll-shaped recording papers having different sizes as the transport roller. First recording paper conveying means for conveying between the image recording means, and second recording paper conveying means for conveying the other of the two roll-shaped recording papers having different sizes between the conveying roller and the image recording means To rotate the transport roller and the first and second recording paper transporting means in forward and reverse directions, and transport the rolled recording paper in the reverse direction toward the first and second recording paper transporting means. A facsimile apparatus having a driving stepping motor and a facsimile apparatus having a current control means for controlling an exciting current of the stepping motor based on an exciting current value predetermined by the system according to the size of the recording paper used. Facsimile apparatus according to symptoms. Wherein said through-up rate table read with reference to the slew-up rate <br/> defined in advance system based on the excitation current value of the stepping motor, 該Su
Thru that is referenced and read in the loop-up rate table
2. The facsimile apparatus according to claim 1, further comprising a through-up means for performing a through-up at an up rate . 3. A roll of recording paper having two different sizes, a recording paper transport roller for transporting the roll of recording paper,
Conveying roller in contact, and conveying an image recording means for recording an image on the rolled recording paper fed between the rollers, feeding該搬one of two rolled recording paper having different sizes roller and said A first recording paper conveying means for conveying between the image recording means and a second recording paper conveying means for conveying the other of the two roll-shaped recording papers having different sizes between the conveying roller and the image recording means; Means for rotating the transport rollers and the first and second recording paper transport means by rotating forward and backward, and transporting the rolled recording paper in the reverse direction toward the first and second recording paper transport means. In a facsimile apparatus having a driving stepping motor, a speed changing means for changing the driving speed of the stepping motor based on the size of the recording paper to be used, and an exciting current value determined in advance by the system based on the driving speed. And a pulse control means for controlling an excitation pulse of the stepping motor. 4. A through-up pulse rate predetermined by a system based on a driving speed of the stepping motor.
A slew-up pulse rate table that refers to and reads out the slew-up pulse rate table, and a slew- up means that performs slew-up at a slew- up pulse rate read with reference to the slew-up pulse rate table. The facsimile apparatus according to claim 4, wherein