JP2001002278A - Roller driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller driving device for improving paper sheet conveying performance in recycling of a roller to be used for paper sheet conveyance of a facsimile device, a printer, a copying machine, or the like. SOLUTION: The roller diameter of a register roller pair is measured by a measuring instrument and input from an input part 301 before the recycled register roller pair is mounted to a facsimile device 1. In the facsimile device 1, the drive frequency of a stepping motor 306 for making the linear speed of the register roller constant is calculated by a calculating part 302 and then stored in a RAM 303 when the roller diameter is input. When the stepping motor 306 is driven, a CPU 304 refers to the drive frequency of the RAM 303 and rotationally drives the stepping motor at the drive frequency through a motor driver 305. Accordingly, even if a recycled article is used as the register roller, the register roller can be rotationally driven in a range of the prescribed linear speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller driving device, and more particularly, to a roller driving device for improving the sheet conveyance performance when reusing rollers used for sheet conveyance in facsimile machines, printers, copiers and the like. About.

[0002]

2. Description of the Related Art Conventionally, facsimile machines, printers,
2. Description of the Related Art In an image forming apparatus such as a copying machine, a product is developed in consideration of recycling of various components.

In particular, the life of a roller for transporting paper of an image forming apparatus is affected by a reduction in the diameter of the roller due to abrasion as well as dirt and scratches on the roller. Can be reused, and there is a level problem with respect to scratches, but it is basically not reusable.

However, a decrease in the diameter of the roller due to the wear of the roller affects the image reduction ratio when the roller is a roller of a paper transport system. In other words, when the roller diameter decreases, the paper conveyance speed decreases, and the image shrinks. In order to prevent the deterioration of the image quality due to the reduction in the roller diameter, it is necessary to stop the reuse of the roller at a level at which the reduction ratio of the image does not become out of the standard due to the reduction in the roller diameter.

In view of the above, there has been proposed an image forming apparatus in which the number of times the roller is reused is marked on the roller shaft, and the roller can be reused within a range satisfying the basic performance (Japanese Patent Laid-Open No. Hei 6 (1994)). 138729).

[0006]

However, in the image forming apparatus described in the above publication, since the number of reuses is only marked on the roller shaft, some rollers are deteriorated to a state where they cannot be reused. If the number of reuses marked on the roller is within the reusable range,
Rollers that have been used and cannot be properly conveyed also result in reuse. For example, a replacement cycle of a roller having a small tolerance width in design or a roller having a long replacement life, for example, a registration roller or the like may be usually 1.2 million sheets. If the amount of wear exceeds the tolerance width, the roller cannot actually be reused. As a result, the image forming apparatus described in Japanese Patent Laid-Open No. 6-138729 has a problem that the original replacement cycle can be applied only when there is a margin for the life of the component.

Therefore, according to the first aspect of the present invention, a roller diameter of a conveying roller for conveying a predetermined sheet is measured and inputted.
Based on the input roller diameter, the drive frequency of the drive motor that sets the linear speed of the transport roller to a predetermined linear speed is calculated, and the drive motor is rotated at the calculated drive frequency, so that the collected transport rollers are removed. When reusing, even if the roller diameter is outside the component tolerance, if the roller diameter is measured and input, the drive frequency of the drive motor that rotates the transport roller according to the roller diameter is set. It is an object of the present invention to provide a roller drive device which can be driven by a roller and satisfy the same transport performance as that of a new transport roller.

According to a second aspect of the present invention, a transport roller transports an original on which an image is formed as a sheet to reading means for reading an image of the original, and reduces the size of the original when the reading means reads the image of the original. When the collected transport rollers are reused, even if the roller diameter of the reused transport rollers is out of the component tolerance, the transport speed of the original can be adjusted to a new value. It is an object of the present invention to provide a roller driving device that can set the same conveying speed as the conveying speed at the time of the conveying roller and can set the reduction ratio of the read image within an appropriate reduction ratio range.

According to a third aspect of the present invention, an original on which an image as a sheet is formed is conveyed while being brought into close contact with a reading means for reading the image of the original, and the image of the original is read by the reading means. By applying to the rollers that control the shrinkage at the time, when the collected transport rollers are reused,
Even when the roller diameter of the reused transport roller is out of the component tolerance, set the transport speed of the original to the same transport speed as that of a new transport roller, and read the image by the contact type reading unit. It is an object of the present invention to provide a roller driving device capable of setting a reduction ratio of a read image within an appropriate reduction ratio range.

According to a fourth aspect of the present invention, a conveying roller conveys a recording sheet as a sheet between a photoreceptor and a transfer section for transferring a toner image on the photoreceptor to the recording sheet. By applying to the registration roller that determines the shrinkage ratio of the transferred image when transferring the toner image on the recording paper,
When reusing the collected registration rollers, even if the roller diameter of the reused registration rollers is out of the component tolerance, the conveyance speed of the recording paper is the same as the conveyance speed of the new registration rollers. It is an object of the present invention to provide a roller driving device capable of reducing the transfer image to have an appropriate reduction ratio when transferring a toner image from a photoconductor to recording paper.

According to a fifth aspect of the present invention, the driving motor is a stepping motor, and the calculating means calculates the number of driving pulses of the stepping motor as a driving frequency, so that the collected conveying rollers can be reused. It is another object of the present invention to provide a roller driving device that can rotate the collected transport roller at the same linear speed as a new transport roller even when the roller is driven to rotate.

[0012]

According to a first aspect of the present invention, there is provided a roller driving apparatus for rotating a conveying roller for conveying a predetermined sheet at a predetermined linear speed by a driving motor. Input means for inputting a roller diameter, calculating means for calculating a drive frequency of the drive motor for setting a linear speed of the transport roller to a predetermined linear speed based on the roller diameter input from the input means, The above object is attained by providing control means for rotating the drive motor at the drive frequency calculated by the means.

According to the above construction, the roller diameter of the transport roller for transporting a predetermined sheet is measured and input, and the drive motor for setting the linear speed of the transport roller to the predetermined linear speed based on the input roller diameter is measured. Since the drive frequency is calculated and the drive motor is rotationally driven at the calculated drive frequency, when the collected transport roller is reused, even when the roller diameter is out of the component tolerance, the roller diameter is reduced. When measured and input, it is possible to set and drive the drive frequency of the drive motor that rotates the transport roller according to the roller diameter, and to achieve the same transport performance as that of a new transport roller. .

In this case, for example, as set forth in claim 2, the conveying roller conveys the original on which the image as the paper is formed to reading means for reading the image of the original, and A roller that determines the reduction ratio when reading the image of the document may be used.

According to the above construction, the conveying roller conveys the original on which the image as a sheet is formed to the reading means for reading the image of the original, and reduces the reduction ratio when the image of the original is read by the reading means. Since it is applied to the rollers that affect it, when the collected transport rollers are reused, even if the roller diameter of the reused transport rollers is out of the part tolerance, the transport speed of the document is set to the new transport speed. The transport speed can be the same as the transport speed at the time of the roller, and the reduction ratio of the read image can be within the appropriate range of the reduction ratio.

Further, for example, as set forth in claim 3, the conveyance roller conveys the original on which the image as the paper is formed while bringing the original into close contact with a reading means for reading the image of the original. And a roller that controls the reduction ratio when reading the image of the original in the above.

According to the above arrangement, the transport roller transports the original on which the image as the paper is formed while bringing the original close to the reading means for reading the image of the original. Since it is applied to the roller that affects the reduction ratio, when the collected transport roller is reused, even if the roller diameter of the reused transport roller is out of the component tolerance, the document transport speed is reduced. The conveyance speed can be the same as the conveyance speed of a new conveyance roller, and the reduction ratio of the read image can be set within an appropriate range when the image is read by the contact type reading unit.

Further, for example, as set forth in claim 4, the transport roller is provided between a photosensitive member for transferring the recording paper as the paper and a transfer unit for transferring a toner image on the photosensitive member to the recording paper. To transfer the toner image on the photoreceptor to the recording paper, and may determine the reduction ratio of the transferred image.

According to the above arrangement, the transport roller transports the recording paper as a sheet between the photosensitive member and the transfer section for transferring the toner image on the photosensitive member to the recording paper, and transfers the toner on the photosensitive member. Since it is applied to the registration roller that determines the shrinkage ratio of the transferred image when transferring the image to the recording paper, when the collected registration roller is reused, the roller diameter of the reused registration roller is out of the component tolerance. The transfer speed of the recording paper can be the same as the transfer speed of a new registration roller even when The rate can be in the range of an appropriate reduction rate.

Also, for example, the driving motor may be a stepping motor, and the calculating means may calculate the number of driving pulses of the stepping motor as the driving frequency. Good.

According to the above construction, the driving motor is a stepping motor, and the calculating means calculates the number of driving pulses of the stepping motor as the driving frequency. Also when rotating, the collected transport roller can be rotationally driven at the same linear speed as a new transport roller.

[0022]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. It should be noted that the embodiments described below are preferred embodiments of the present invention, and therefore, various technically preferable limitations are added. However, the scope of the present invention is not limited to the following description. The embodiments are not limited to these embodiments unless otherwise specified.

FIGS. 1 and 2 show a first embodiment of the roller driving device of the present invention. FIG. 1 shows a facsimile to which the first embodiment of the roller driving device of the present invention is applied. FIG. 1 is a schematic configuration diagram of an apparatus 1.

Referring to FIG. 1, the facsimile apparatus 1 includes a reading unit 100 and a recording unit 200.
Is housed in the main body housing 2, and a reading unit 100 is disposed on the upper part of the main body housing 2.

The reading section 100 includes a document table 101, a pickup roller 102, a feed roller 103, a reverse roller 104, a pair of R0 rollers 105, a pair of R1 rollers 106, a pair of R2 rollers 107, a pair of discharge rollers 108, a document stack tray 109, A reading sensor 110 and the like are provided.
1 is placed.

The reading section 100 conveys an arbitrary number of documents 111 set on a document table 101 to a predetermined separation position by a pickup roller 102, and feeds a plurality of documents 111 entering the separation position to a feed roller 103.
And the reverse roller 104 separates the originals 111 one by one, and only the uppermost original 111 is
It is transported to the position of No. 5. The R0 roller pair 105 transfers the sent original 111 to the R1 roller in front of the reading sensor 110.
The document is conveyed to the roller pair 106, and the R1 roller pair 106 conveys the conveyed document 111 to the R2 roller pair 107 through the reading sensor 110. Here, the R1 roller pair 106 is the R1 roller 1 that is being driven by the driving source.
06a and the original 1 pressed by the R1 roller 106a.
A pair of rollers composed of a pressure facing roller 106b that conveys the original 11 and conveys the original 111 to the reading sensor 110, and also determines the reduction ratio when the reading sensor 110 reads the image of the original 111. Roller.

A reading sensor (reading means) 110 reads an image of the document 111 conveyed by the R1 roller pair 106 to the R2 roller pair 107 and outputs the image as image data.

The R2 roller pair 107 includes a reading sensor 11
The document 111 that has passed through “0” is conveyed to the sheet discharge roller pair 108, and the sheet discharge roller pair 108 discharges the document 111 onto the document stack tray 109.

The pickup roller 102, feed roller 103, reverse roller 104, R0 roller pair 105, R1 roller pair 106, R2 roller pair 10
7. The discharge roller pair 108 is driven by a drive motor which is one drive source.

Here, the general relationship between the R1 roller pair 106 and the R2 roller pair 107 is expressed by the following equation.

VR1 ≦ VR2 FR1 ≧ FR2 VR1 is the linear speed of the R1 roller pair 106, VR2 is the linear speed of the R2 roller pair 107, FR1 is the pressing force of the R1 roller pair 106, and FR2 is the linear speed of the R2 roller pair 107. Pressure.

R1 roller pair 106 and R2 roller pair 107
Are in the above relationship, it is possible to manage the reduction ratio of the image when the reading sensor 110 reads the original 111 by the linear velocity of the R1 roller pair 106. When a stepping motor is used as the driving motor, by changing the driving frequency (the number of driving pulses) of the stepping motor to make the linear velocity VR1 of the R1 roller pair 106 constant, even if the R1 roller pair 106 is reused, for example, In addition, the reduction ratio of the image read by the reading sensor 110 does not fall outside a preset standard. However, it is necessary to design the R1 roller pair 106 so that the above relationship is satisfied even when the roller pair 106 is reused.

The recording unit 200 includes a paper feed cassette 202 on which a plurality of recording papers 201 are set, a paper feed roller 203, a paper feed / convey roller pair 204, a registration roller pair 205, a transfer roller 206, a developing unit 207, and an optical unit 208. , Charging unit 20
9, cleaning unit 210, photoconductor 211, fixing unit 21
2, a paper discharge roller pair 213 and the like.

The recording section 200 picks up the recording paper 201 in the paper supply cassette 202 by the paper supply roller 203 and conveys it to the registration roller pair 205 via the paper conveyance roller pair 204. The registration roller pair 205 is rotated by a driving motor (not shown) as a driving source, and is pressed against the registration roller 205a at a predetermined pressure. The registration roller 205a is driven by the rotation of the registration roller 205a to rotate the recording paper 201. Opposite roller 205 to be transported
b, and a pair of rollers. The registration roller pair 205, in particular, the registration roller 205a
Controls the reduction ratio of the image during image recording.

The registration roller pair 205 adjusts the timing of the conveyed recording paper 201,
To the transfer roller 206 and the transfer roller 206
6, the fixing unit 21 fixes the recording paper 201 on which the toner image has been transferred.
Convey to 2.

The photosensitive member 211 is driven to rotate clockwise in FIG. 1 and is uniformly charged by the charging unit 209. Then, the optical unit 208 irradiates a laser beam modulated with image data by the optical unit 208, and the electrostatic latent image is irradiated. An image is formed, and toner is adhered in the developing unit 207 to form a toner image. The photoconductor 211 transfers the toner image to the recording paper 201 by the transfer roller 206,
After the residual toner is removed by the cleaning unit 210, the toner is uniformly charged again by the charging unit 209 to be used for the next image formation.

The recording paper 201 on which the toner image has been transferred by the transfer roller 206 is conveyed to the fixing unit 212 and
Reference numeral 12 denotes a fixing roller 214 which has a built-in heater and is heated to a fixing temperature and driven to rotate, and a pressure roller 2 which is pressed against the fixing roller 214 and rotates following the fixing roller 214.
In step 15, the recording paper 201 is conveyed to the discharge roller pair 213 while being heated and pressed, and the toner image on the recording paper 201 is fixed on the recording paper 201.

The discharge roller pair 213 discharges and places the recording paper 201 on which the toner image has been fixed by the fixing unit 212 onto a discharge tray 206.

Here, the registration roller pair 205
The recording paper 201 is moved at a linear speed slightly faster than the photoconductor 211 by a nip portion (contact portion) between the transfer roller 206 and the photoconductor 211.
Transport to It is possible to manage the reduction ratio of the toner image transferred to the recording paper 201 at the linear speed of the registration roller 205a of the registration roller pair 205. It is necessary to provide the following relationship between the pair of sheet feeding / conveying rollers 204 and the pair of registration rollers 205.

Vre ≦ Vhe Fre ≧ Fhe where Vre is the linear velocity of the registration roller pair 205, Vhe
Is the linear velocity of the pair of feed / convey rollers 204, Fre is the pressure of the pair of registration rollers 205, and Fhe is the pair of feed / convey rollers 2
04.

By satisfying the above relationship, the reduction ratio of the toner image transferred to the recording paper 201 by the registration roller pair 205, particularly, the registration roller 205a can be managed.

When a stepping motor is used as the driving motor, the driving frequency (the number of driving pulses) of the stepping motor is changed to keep the linear velocity Vre of the registration roller 205a constant. Even when used, the shrinkage ratio of the toner image on the recording paper 201 does not fall outside a preset standard. However, it is necessary to design the registration roller pair 205 so that the above relationship is satisfied when the registration roller pair 205 is reused.

In this embodiment, the paper feed rollers 20
3. Paper feed roller pair 204, registration roller pair 205
, A stepping motor is used as a driving source, and a single brushless DC motor is used as a driving source for other units.

FIG. 2 is a block diagram showing the drive unit of the facsimile apparatus 1. As shown in FIG.
That is, the facsimile machine 1 has
Input unit 301, calculation unit 302, RAM (Random Access
Memory) 303, CPU (Central Processing Unit)
304, a motor driver 305, a stepping motor 306, and the like.

An input unit (input means) 301 is for inputting the roller diameters of the R1 roller 106a and the registration roller 205a measured by a measuring device (not shown), and is, for example, an operation unit of the facsimile machine 1. Note that the input unit 301 may be, for example, an interface for directly inputting data of a measuring device to the facsimile apparatus 1, but it is inexpensive to manually input measurement data using the operation unit of the facsimile apparatus 1. It is easy. The measuring device measures the roller diameter in, for example, millimeter (mm) units.

The calculating section (calculating means) 302
The drive frequency (the number of drive pulses) of the stepping motor 306 is calculated from the roller diameter data input from Step 1.

The RAM 303 stores the drive frequency calculated by the calculation unit 302 at a predetermined address under the control of the CPU 304. At this time, when inputting the broadcast roller diameter of the R1 roller 106a and the registration roller 205a,
The drive frequency for each of the rollers 106a and 205a is calculated and stored at different addresses in the RAM 303.

The CPU (control means) 304 stores the drive frequency calculated by the calculation unit 302 in the RAM 303 as described above.
And driving the stepping motor 306 via the motor driver 305 with reference to the driving frequency of the address in the RAM 303 when the stepping motor 306 is driven.

The motor driver 305 is supplied with power of 24 [V] from the power supply 307. The motor driver 305 rotates the stepping motor 306 under the control of the CPU 304.

The stepping motor 306 is a drive motor for the reading unit 100 or the recording unit 200.

Next, the operation of the present embodiment will be described. When the facsimile apparatus 1 reuses the R1 roller pair 106 that affects the reduction ratio when reading the original 111 and the registration roller pair 205 that affects the reduction ratio when recording an image on the recording paper 201, The roller diameters of the R1 roller pair 106 and the registration roller pair 205 are measured and the R1 roller pair 106 and the registration roller pair The feature is that the rotation speed of the drive motor for driving the motor 205, specifically, the linear speed is controlled.

Now, for the sake of simplicity, the registration roller pair 2
05 is driven by two-phase excitation by the stepping motor 306 in FIG.
6 will be described.

First, before attaching the regenerated registration roller pair 205 to the facsimile apparatus 1, the roller diameter of the registration roller pair 205 is measured by a measuring device, and
Input from 1. When the facsimile apparatus 1 specifies a roller and inputs a roller diameter, the calculation unit 302 calculates the drive frequency of the stepping motor 306 and outputs the result to the RAM 30.
3 is stored.

That is, the linear velocity Vre of the registration roller pair 205 can be obtained by the following equation.

Vre = (P / 48) × η × D × π (1) where P is the drive frequency (PPS) of the stepping motor 306, and D is the roller diameter (mm) of the registration roller 205a. , Η is the reduction ratio, and Vre is the registration roller 20
The linear velocity (mm / sec) is 5a.

Accordingly, the following equation is established between the driving frequency P of the stepping motor 306 and the registration roller 205a.

P = (48 × Vre) / (π × η) × (1 / D) (2) As can be seen from the above equation (2), the registration roller pair 20
By calculating the roller diameter of the registration roller 205a and inputting it from the input unit 301, the calculation unit 302 can calculate the drive frequency P of the stepping motor 306 for keeping the linear speed of the registration roller 205a constant. it can.

For example, the initial condition is that the driving frequency P is 48
0 (PPS), reduction ratio η is 0.2, registration roller 20
The roller diameter D of the roller 5a is 14.00 (mm), and the linear velocity Vre of the registration roller 205a is 87.665 (mm / sec).
c), when the roller diameter D of the collected registration roller 205a is 13.90 (mm), the facsimile apparatus 1 using the re-used registration roller 205a is obtained from the above equation (2). , Stepping motor 3
The drive frequency P of 06 is 483.46 (PPS).

Then, as described above, the facsimile apparatus 1 uses the stepping motor 30 calculated by the calculation unit 302.
6 is stored in the RAM 303, and when the stepping motor 306 is driven, the CPU 304
03, the motor driver 305 is referred to.
Through the driving frequency P
To rotate.

At this time, the driving frequency P is calculated to keep the linear velocity Vre of the registration roller 205a constant, as described above.
Even when a reusable product is used as a, the registration roller 205a can be rotationally driven within the range of the specified linear velocity Vre.

For example, in the above example, the driving frequency P (P = 480 (PP
S)), when the re-use registration roller 205a is used, P = 483.46 is set and the registration roller 2
The linear velocity Vre of 05a is kept constant.

In this case, if the driving frequency P of the stepping motor 306 is not changed, the linear velocity Vre of the registration roller 205a becomes 13.90 / 14.00 = 0.9929, which is about 0.7% slower. Normally, the standard of the image reduction ratio is within ± 0.5%. Therefore, unless the driving frequency P of the stepping motor 306 is changed as described above, the standard of the image reduction ratio may not be satisfied.

However, in the facsimile apparatus 1 of the present embodiment, as described above, since the driving frequency P of the stepping motor 306 is changed according to the roller diameter D of the registration roller 205a, the linear velocity of the registration roller 205a is changed. Vre can be kept constant, and the reduction ratio of the image can be within the range of the standard.

That is, the drive frequency P of the stepping motor 306 is calculated, for example, from 483 (PP
S), the linear velocity Vre of the registration roller 205a becomes
483 × 13.90) ÷ (480 × 14.00) = 0.
9991, which is -0.09% shrinkage ratio as compared with the initial condition, and the above-mentioned standard can be sufficiently satisfied.

As described above, the facsimile apparatus 1 of the present embodiment measures and inputs the roller diameters of the R1 roller 106a and the registration roller 205a, which are the transport rollers for transporting the paper, and based on the input roller diameters. The drive frequency of a stepping motor 306, which is a drive motor that sets the linear speed of the R1 roller 106a and the registration roller 205a to a predetermined linear speed, is calculated, and the stepping motor 306 is driven to rotate at the calculated drive frequency.

Therefore, the recovered R1 roller 106a
When reusing the registration roller 205a, even if the roller diameter is out of the component tolerance, if the roller diameter is measured and input, the R1 roller 106a and the registration roller 205a are rotated according to the roller diameter. The driving frequency of the stepping motor 306 to be driven can be set and driven, and the same transport performance as that of the new R1 roller 106a and the registration roller 205a can be satisfied.

As a result, the reduction ratio of the read image can be set within an appropriate range of the reduction ratio, and the reduction ratio of the transferred image can be set within the appropriate range of the reduction ratio.

In the above description, the case where the drive frequency P of the registration roller 205a is controlled has been described. However, the present invention can be similarly applied to other rollers, for example, the case of the R1 roller pair 106.

In this embodiment, the R1 roller pair 1
06 and the registration roller pair 205 have been described,
It is desirable to measure and input the roller diameter of the roller that has the highest contribution to the image shrinkage in terms of function, and to manage the linear velocity of the roller.

FIG. 3 is a circuit block diagram of a driving section of a facsimile apparatus to which the second embodiment of the roller driving apparatus according to the present invention is applied.

This embodiment is applied to a facsimile machine similar to the facsimile machine of the first embodiment, and in the description of the present embodiment, the first embodiment will be appropriately described. The description will be made using the reference numerals used in the description.

In FIG. 3, facsimile apparatus 400
Is provided with an input unit 401, a RAM 303, a CPU 304, a motor driver 305, a stepping motor 306, and the like. The driving frequency P of the stepping motor 306 measured by the measuring device 402 and calculated by the calculator 403 is input from the input unit 401. Is done.

The measuring device 402 and the calculating device 403 are independent of the facsimile machine 1, and the measuring device 402
Are the R1 roller pair 106 which affects the reduction ratio when reading the original 111 and the registration roller pair 205 which affects the reduction ratio when recording an image on the recording paper 201, in particular, the R1 roller 106a and the registration roller 205a. The roller diameter is measured and output to the calculator 403.

The calculator (calculating means) 403 calculates the R1 roller 106a and the registration roller 2 according to the above equation (2).
The drive frequency P of the stepping motor 306 when the step 05a is driven by the stepping motor 306 is calculated.

The input unit (input means) 401
3 is stored in the RAM 303 at the drive frequency P, which is detachably connected to and is input in the HEX format.

As in the first embodiment, when the stepping motor 306 is driven, the CPU 304
03, the motor driver 305 is referred to.
, The stepping motor 306 is driven to rotate.

Therefore, the facsimile apparatus 400 according to the present embodiment uses the calculator 403 for the facsimile apparatus 400.
Facsimile machine 400
Can be inexpensive.

FIG. 4 is a schematic front view of a reading apparatus to which a third embodiment of the roller driving apparatus according to the present invention is applied.

In FIG. 4, a reading device 500 includes a document tray 501, a feed roller 502, a separation pad 50,
3, a reading sensor 504, a white platen roller 505, a document stack tray 506, and the like. A plurality of documents are set on the document tray 501.

The feed roller 502 has a separation pad 5
The feed roller 502 is rotated in the counterclockwise direction, separates the documents set on the document tray 501 one by one by the separation pad 503, and conveys the documents toward the reading sensor 504.

The reading sensor (reading means) 504 is in contact with a white platen roller 505, and the white platen roller (conveying roller) 505 is rotated clockwise by a drive motor (not shown).
The original sent out from the printer is discharged and placed on the original stack tray 506 while keeping the original close to the reading sensor 504.

The reading sensor 504 reads an image of a document conveyed while being closely contacted by the white platen roller 505 at a predetermined resolution, and outputs image data.

Since the reading device 500 reads the image of the document conveyed at a predetermined linear speed by the white platen roller 505 with the reading sensor 504, the reduction ratio of the read image by the reading sensor 504 is determined by the white platen roller 505. It is managed by.

The white platen roller 505 is driven to rotate by a driving motor (not shown), for example, a stepping motor.
As shown in the block circuit diagram of the first embodiment or the second embodiment, the linear velocity of the white platen roller 505 is controlled to be constant by controlling.

Therefore, when the collected white platen roller 505 is reused, even if the roller diameter of the reused white platen roller 505 is out of the component tolerance, the conveyance speed of the original is reduced to a new white platen roller. Roller 505
In this case, the transfer speed can be the same as the transfer speed at the time of (1), and the reduction ratio of the read image can be set within an appropriate range of the reduction ratio.

As described above, the invention made by the present inventor has been specifically described based on the preferred embodiments. However, the present invention is not limited to the above, and various modifications can be made without departing from the gist of the invention. It goes without saying that it is possible.

For example, in each of the above embodiments, the case where a stepping motor is used as the driving motor has been described. However, the driving motor is not limited to the stepping motor, and may be, for example, a hybrid motor. Well, if the drive motor is a hybrid motor, it can be dealt with by changing "48" used in the above equations (1) and (2) to "200",
In each of the above embodiments, the stepping motor is 2
Although it is driven by phase excitation, it may be 1-2 phase excitation, and if it is 1-2 phase excitation, “48” used in the above equations (1) and (2) is replaced by “96”. Can be dealt with.

[0088]

According to the roller driving device of the first aspect of the invention, the roller diameter of the transport roller for transporting a predetermined sheet is measured and input, and the linear velocity of the transport roller is determined based on the input roller diameter. Is calculated as a predetermined linear speed, and the drive motor is rotated at the calculated drive frequency.When the collected transport roller is reused, the roller diameter is out of the component tolerance. When the roller diameter is measured and input, the drive frequency of the drive motor that rotates the transport roller can be set and driven according to the roller diameter. Similar transport performance can be satisfied.

According to the roller driving device of the second aspect of the present invention, the transport roller transports the original on which the image as the paper is formed to the reading means for reading the image of the original, and the original is scanned by the reading means. Since it is applied to the roller that affects the reduction ratio at the time of reading an image, even when the roller diameter of the reused transport roller is outside the component tolerance when reusing the collected transport roller, The transport speed of the document can be set to the same transport speed as that of a new transport roller, and the reduction ratio of the read image can be set within an appropriate reduction ratio range.

According to the roller driving device of the third aspect of the present invention, the transport roller transports the original on which the image as the paper is formed while closely contacting the reading means for reading the image of the original. Is applied to the roller that affects the reduction ratio when reading the image of the original document, so when the collected transport roller is reused, the roller diameter of the reused transport roller is out of the component tolerance In addition, the document conveyance speed can be set to the same conveyance speed as that of a new conveyance roller, and when the image is read by the contact type reading unit, the reduction ratio of the read image is set to an appropriate reduction ratio. Inside.

According to the roller driving device of the present invention, the transport roller transports the recording paper as the paper between the photoreceptor and the transfer section for transferring the toner image on the photoreceptor to the recording paper. Since the toner image on the photoreceptor is applied to the registration roller which determines the reduction ratio of the transferred image when the toner image is transferred onto the recording paper, when the collected registration roller is reused, the re-used registration roller is used. Even when the roller diameter of the roller is out of the component tolerance, the conveyance speed of the recording paper can be set to the same conveyance speed as that of a new registration roller, and the toner image from the photoconductor is transferred to the recording paper. When transferring, the reduction ratio of the transferred image can be set within an appropriate range of the reduction ratio.

According to the roller driving device of the present invention, the driving motor is a stepping motor, and the calculating means calculates the number of driving pulses of the stepping motor as the driving frequency. When re-using and rotating by stepping motor,
The collected transport roller can be driven to rotate at the same linear speed as a new transport roller.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a facsimile apparatus to which a first embodiment of a roller driving device according to the present invention is applied.

FIG. 2 is a circuit block diagram of a drive system of the facsimile apparatus of FIG.

FIG. 3 is a circuit block diagram of a driving system of a facsimile apparatus to which a second embodiment of the roller driving device according to the present invention is applied.

FIG. 4 is a schematic front view of a reading device to which a third embodiment of the roller driving device according to the present invention is applied;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 facsimile apparatus 100 reading section 101 document table 102 pickup roller 103 feed roller 104 reverse roller 105 R0 roller pair 106 R1 roller pair 106a R1 roller 106b pressure facing roller 107 R2 roller pair 108 discharge roller pair 109 document stack tray 110 reading sensor 111 Document 200 Recording Unit 201 Recording Paper 202 Paper Cassette 203 Paper Feed Roller 204 Paper Feed / Convey Roller Pair 205 Registration Roller 205A Registration Roller 205b Opposing Roller 206 Transfer Roller 207 Developing Unit 208 Optical Unit 209 Charging Unit 210 Cleaning Unit 211 Photoconductor 212 fixing unit 213 discharge roller pair 214 fixing roller 215 pressure roller 301 input unit 302 calculation unit 303 RAM 304 CPU 305 motor Driver 306 stepper motor 400 the facsimile apparatus 401 input unit 500 reading apparatus 501 document tray 502 feeding roller 503 separation pad 504 reading sensor 505 white platen roller 506 document stacking tray

Claims (5)

[Claims] An input means for inputting a roller diameter of the transport roller, wherein the input means inputs a roller diameter of the transport roller. Calculating means for calculating a drive frequency of the drive motor for setting the linear speed of the transport roller to a predetermined linear speed based on the roller diameter; and controlling the drive motor to rotate at the drive frequency calculated by the calculation means. Means for driving the roller. 2. The image forming apparatus according to claim 1, wherein the conveying roller conveys the original on which the image as the paper is formed to a reading unit that reads an image of the original, and controls a reduction ratio when the reading unit reads the image of the original. 2. The roller according to claim 1, wherein
The roller driving device as described in the above. 3. The image forming apparatus according to claim 1, wherein the conveying roller conveys the document on which the image is formed as the sheet while bringing the document into close contact with reading means for reading the image of the document, and reduces the size of the document when the reading means reads the image of the document. The roller driving device according to claim 1, wherein the roller is a roller that controls the ratio. 4. The image forming apparatus according to claim 1, wherein the conveying roller conveys the recording paper as the paper between a photoconductor and a transfer unit that transfers a toner image on the photoconductor to the recording paper. 2. The roller driving device according to claim 1, wherein the roller is a registration roller that controls a reduction ratio of a transferred image when the image is transferred onto the recording paper. 5. The apparatus according to claim 1, wherein said drive motor is a stepping motor, and said calculating means calculates the number of drive pulses of said stepping motor as said drive frequency. The roller driving device as described in the above.