JP2009254000A - Motor driver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform the motor drive to the point nearest to the limit of heat resistance. <P>SOLUTION: A motor driver has: a drive motor 35 which is attached to a motor holder 40, in a state of forming space S, with its bottom 35b being floated from the resinous motor holder 40; a calorific value acquiring means, which gets the added calorific value of the drive motor 35 by estimating the calorific value, based on the drive time of the drive motor 35 in a period when predetermined drive is made; and a waiting time deciding means, which decides the waiting time to delay the drive of the drive motor 35, based on the accumulated calorific value computed from the acquired added calorific value. Then, the drive range of the drive motor 35 is widened to a temperature range which surpasses a value of having subtracted 40°C from the heat resistance limit value of the drive motor 35. Parts of the wall parts of the motor holder 40 positioned under and above the drive motor 35 are cut out. An inkjet printer, or a multifunctional printer, etc. has this motor driver. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a motor drive device.

Recently, an apparatus called a multifunction printer has begun to be sold. This printer multifunction device
In addition to the printer function, it has a copy function, a document reading function (scanning function), and a direct function for printing a photograph directly from image data of a digital camera or a mobile phone. In the document reading portion of such a printer multifunction device, a device that automatically supplies a document to a reading portion for reading the document (automatic document feeder; hereinafter referred to as ADF (Auto Document Feed)
er). ).

In some ADF apparatuses, a stepping motor is used as a driving source, and various types of rollers are driven by the driving of the stepping motor to convey a document. Then, the original can be read at the reading portion, and image data can be formed from the original. Further, when the document reading apparatus is attached to a copying apparatus or a printing apparatus, copying or printing can be executed based on image data. As a document reading apparatus provided with such an ADF apparatus, there is one disclosed in Patent Document 1.

In the ADF apparatus and the ink jet printer described in Patent Document 1, a resin is used for a case or the like for weight reduction. For this reason, a drive motor as a paper conveyance drive source is attached to a resin case or the like, but the attachment portion may be deformed by heat generated by the drive motor. As one means for solving such a problem, in order to avoid an overheating state during continuous driving of the motor, a method for estimating the heat storage amount of the motor itself by calculation has been developed by the present applicant (see Patent Document 2). When the technique described in Patent Document 2 is used, it is possible to reliably prevent the motor from being overheated during printing.

JP 2004-64486 A JP 2007-64486 A

When the invention described in Patent Document 2 is used, an overheated state of the motor can be prevented. But,
The heat storage amount addition process described in the cited document 2 is calculated by the feeding time per A4 sheet. This is convenient during printing (printer), but it has been found that the performance of the motor is not fully utilized during scanning using ADF. In other words, paper feeding by ADF is
This is because there is an intermediate stop depending on the scan resolution, or a difference in the motor drive current value due to the difference in scan resolution. As described above, when the stoppage occurs halfway, the estimated temperature becomes higher than the original motor temperature. Similarly, in the case of driving with a small driving current value, the estimated temperature is higher than the original motor temperature. This is because the estimated value must be set to a maximum value in consideration of various usages (modes) in order to prevent overheating of the motor. In this way, if the heat storage amount addition process at the time of printing is used as it is or if the maximum value is set in consideration of various usages (modes) at the time of scanning, the following problems occur. That is, the heat is dissipated due to a pause or the like, so that although the heat storage amount of the motor is sufficiently low, it is determined that the heat storage amount is high, and the motor enters a pause operation. As a result, the scanning performance is not high.

In the case of a conventional motor drive device, the motor limit (heat limit temperature) is, for example, 13
If it is 0 ° C., the motor actually stops when the temperature reaches about 70 ° C. to 75 ° C. That is, in actual operation, it is driven with a margin of about 60 ° C. This is because the estimation of the heat storage amount is low as described above, and various driving methods of the motor and the resin case to be attached are taken into consideration. Thus, in the case of the conventional motor drive device, it is not used to the vicinity of the limit of the motor, and the efficiency of the device is reduced.

The present invention has been made based on the above circumstances, and an object of the present invention is to provide a motor drive device capable of driving a motor closer to the limit of heat resistance.

In order to solve the above-mentioned problems, the motor drive device of the present invention floats the bottom surface from the resin motor holder to be attached and forms a gap between the drive motor attached to the motor holder and the drive motor drive time. Based on the accumulated heat storage amount of the drive motor calculated from the acquired heat generation amount and the heat generation amount acquisition means for estimating the heat generation amount of the drive motor and obtaining the heat generation addition amount of the drive motor Waiting time determining means for determining a waiting time for delaying the drive motor, and the drive range of the drive motor is expanded to a temperature range exceeding a value obtained by subtracting a predetermined temperature from the heat resistant limit temperature of the drive motor.

When configured in this way, the cooling effect due to the structural factor and the accurate heat generation amount estimation due to the control factor are added in a superimposed manner, so that the drive motor is driven to the limit of heat resistance.
It is possible to make it closer. In particular, 4 from the heat resistance limit temperature of the drive motor.
Since the drive range of the drive motor is expanded to a temperature range exceeding the value obtained by subtracting 0 ° C., it is possible to drive to the vicinity of the limit of the drive motor. For example, 40 ° C. is assumed as the predetermined temperature.

Further, the motor drive device of another invention is a drive motor based on a drive motor attached to the motor holder in a state where a bottom surface is floated from a resin motor holder to be attached and a gap is formed, and a drive time of the drive motor. Heat generation amount obtaining means for obtaining the heat generation amount of the drive motor, and a waiting time for delaying the drive motor based on the accumulated heat storage amount of the drive motor calculated from the obtained heat generation addition amount A waiting time determining means for determining a wall portion extending horizontally in a lower portion and an upper portion of the motor holder, a part of a wall portion positioned in a lower portion and an upper portion of the drive motor being cut out, and passing through a gap The amount of air is increased.

When configured in this way, the cooling effect due to the structural factor and the accurate heat generation amount estimation due to the control factor are added in a superimposed manner, so that the drive motor is driven to the limit of heat resistance.
It is possible to make it closer. In particular, a part of the wall located at the lower and upper parts of the drive motor is cut away to increase the amount of air passing through the gap, so that the cooling effect increases, and further to the limit of the drive motor. Drive becomes possible.

Furthermore, the motor drive device of another invention is based on the drive motor attached to the motor holder in a state where the bottom surface is floated from the resin motor holder to be attached and a gap is formed, and the drive time of the drive motor. Heat generation amount obtaining means for estimating the heat generation amount of the drive motor and obtaining the heat generation addition amount of the drive motor, and a waiting time for delaying the drive motor drive based on the cumulative heat storage amount of the drive motor calculated from the acquired heat generation addition amount Waiting time determining means for determining
In addition to the two mounting flange portions extending on both sides of the bottom surface of the drive motor, an enlarged flange portion that connects the mounting flange portions is provided so as to surround the bottom surface, thereby increasing the heat radiation amount.

When configured in this way, the cooling effect due to the structural factor and the accurate heat generation amount estimation due to the control factor are added in a superimposed manner, so that the drive motor is driven to the limit of heat resistance.
It is possible to make it closer. In particular, since the enlarged flange portion is provided so as to surround the bottom surface of the drive motor and the heat radiation amount is increased, the cooling effect is increased,
Further, it is possible to drive to the vicinity of the limit of the drive motor.

Further, in addition to the above-described inventions, another invention extends to the bottom surface of the drive motor 2 on both sides thereof.
Two flange portions for attachment are provided, and the flange portions for attachment are attached to two attachment portions that protrude slightly from the bottom portion of the motor holder and are spaced from each other.

In the case of such a configuration, the gap can be formed only by providing two attachment portions on the motor holder. That is, since the same drive motor can be adopted as the conventional motor, the additional cost for forming the gap is almost unnecessary, and there is no disadvantage in terms of cost.

Further, according to another invention, in addition to each of the above-described inventions, the drive motor is driven with a different current value depending on a difference in resolution for reading a document, and the estimated amount of generated heat corresponds to a difference in resolution for reading the document. A heat generation addition amount is obtained by applying a coefficient, and a new drive by the drive motor is started after the waiting time.

When configured in this manner, the amount of heat addition varies depending on the resolution at which the document is read, and the drive motor can be driven closer to the limit of heat resistance.

Further, in another invention, in addition to the above-described invention, the calorific value acquisition means further obtains a coefficient of the size of the portion to read the document by multiplying a value based on a difference according to a difference in resolution for reading the document. As a result, the heat generation amount of the drive motor is obtained.

When reading a document, even if the target medium to be read is large, the actual reading location may be small. In such a case, the amount of heat generated by the drive motor is higher than that when reading the entire target medium. Depending on the method, it grows larger or smaller. When configured as in the present invention, it is possible to cope with such fluctuations.

Further, in another invention, in addition to the above-described inventions, the calorific value acquisition means sets the calorific value as an estimated predetermined value when the estimated calorific value is not less than a predetermined value or exceeds a predetermined value.

In such a configuration, the upper limit of the estimated heat generation amount is clipped to a predetermined value. For this reason, in the case of an apparatus that has a high resolution for reading an original, a large amount of data to be read, and cannot be stored in a memory, and reading of the original is temporarily stopped, such an apparatus can be configured with the present invention. It is possible to respond appropriately.

According to another invention, in addition to the above-described inventions, a stepping motor is used as a drive motor, and automatic feeding is performed by the stepping motor and taking out a document from a document placement unit for storing a plurality of documents. A pull-in area at the time of start-up when the determination means determines whether or not an interruption occurs during the operation of reading the original supplied by the automatic paper supply means by the reading unit; And a motor control means for driving the stepping motor in the pull-out region after a predetermined stabilization step has been driven.

In such a configuration, when it is determined that the interruption is caused in the determining means, the stepping motor is started in the pull-in area and driven in the pull-out area after a predetermined stabilization step. Thereby, the stepping motor can be reliably driven without stepping out at the time of startup. In addition, since the stepping motor is driven in the pull-out region after the elapse of a predetermined stabilization step, the current value of the stepping motor can be reduced to suppress heat generation.

Hereinafter, a motor drive device according to an embodiment of the present invention will be described with reference to the drawings. The motor driving device will be described as a part of the printer multifunction device.

<Overall schematic configuration>
FIG. 1 is a diagram illustrating a configuration of a document reading device 10 in a printer multifunction peripheral 1 including a motor driving device according to an embodiment of the present invention. The document reading apparatus 10 shown in FIG. 1 is a type in which an ADF apparatus 30 is provided on the scanner apparatus 20. The document reading apparatus 10 is placed on the upper part of the printer function unit 50. FIG. 2 is a diagram illustrating a state in which the ADF motor 35 serving as a drive motor is attached to the motor holder 41 (excluding screws). FIG.
It is a figure which shows the motor holder. FIG. 4 is a plan view of the ADF motor 35. FIG.
FIG. 4 is a side view of a main part showing a state where an ADF motor 35 is attached to a motor holder 41.

As shown in FIG. 1, the scanner device 20 includes a housing 21, an optical unit 22, and a data conversion unit 23. The housing 21 is provided with openings 211 and 212.
The opening 211 is provided with a cut sheet document table 213 made of a transparent member such as glass. In addition, the ADF manuscript table 2 that is also made of a transparent member such as glass is provided in the opening 212.
14 is provided. In reading the original P on the cut sheet original table 213, the originals P are placed on the cut sheet original table 213 one by one, and the original P does not move. On the other hand, when reading the document P on the ADF document table 214, the document P is fed by the ADF device 30, and thus the document P moves on the ADF document table 214.

The optical unit 22 includes an irradiation carriage 221 and a fixed reflection unit 222. The irradiation carriage 221 is provided so as to be movable inside the housing 21 along the arrow X direction in FIG. The irradiation carriage 221 includes a lamp 223 and a first mirror 2.
24 is fixedly provided. The lamp 223 has a longitudinal direction that is perpendicular to the arrow X direction and the arrow Y direction, and irradiates the document P with light. The first mirror 224 reflects the light emitted from the lamp 223 and reflected by the document P toward the second mirror 225.

Further, the fixed reflecting portion 222 is inside the housing 21 and is X2 more than the ADF document table 214.
It is fixed to the part near the end on the side. The fixed reflector 222 includes a second mirror 225 and a third mirror 226, and reflects the light reflected by the first mirror 224 along the direction of the arrow Y2 by the second mirror 225. Further, the light reflected by the second mirror 225 is reflected by the third mirror 226 so as to travel in the X1 direction.

The data conversion unit 23 includes an imaging lens 231 and an image sensor 232. The imaging lens 231 forms reflected light (an optical image) on the image sensor 232. The image sensor 232 is configured by arranging light receiving elements (CCD: Charge Coupled Device) at a predetermined pixel density along the longitudinal direction. This image sensor 232 generates and accumulates electric charges according to the amount of received light from the optical image, and outputs it as an electrical signal.

The ADF device 30 corresponds to automatic paper feeding means, and is located above the cut sheet original table 213 and the ADF original table 214 of the scanner device 20. The ADF device 30 includes a housing 31
A paper feed tray 32, a transport roller group 33, a paper discharge tray 34, and an ADF motor 35 which is a scanner transport motor indicated by a dotted line. The transport roller group 33 obtains a driving force from the ADF motor (drive motor) 35. Note that only one conveyance motor may be provided, and the document reading apparatus 10 may obtain driving force from the one conveyance motor provided in the printer function unit 50.

The housing 31 is a part that supports the entire ADF device 30, but has a function as a cover that covers the conveyance roller group 33 so as not to be exposed to the outside on the side indicated by an arrow X2 in FIG. Yes. The paper feed tray 32 corresponds to the document placement unit and is a part on which a plurality of documents P to be read are placed. Further, the transport roller group 33 constitutes a transport path 36 for transporting the document P by a plurality of rollers. In the transport roller group 33, there are a paper feed roller 331, a retard roller 332, a paper feed roller 333, a paper discharge roller 334, and the like. Among these, the paper feed roller 331 is a roller for feeding the original P existing on the paper feed tray 32. Further, the retard roller 332 has a coefficient of friction larger than the coefficient of friction between the originals P, and can prevent double feeding of the originals P. A member having a large coefficient of friction such as cork is attached to a portion facing the retard roller 332.

The paper feed roller 333 is provided with the largest diameter in the transport roller group 33. The feed speed of the paper feed roller 333 is controlled so that the document P is fed onto the ADF document table 214 at a predetermined transport speed. In addition, a paper discharge roller 334 is positioned in the vicinity of the paper discharge tray 34 in the transport path 36, and the original P that has been read is discharged onto the paper discharge tray 34. Each of the rollers including the paper feed roller 333 is provided with a driving force by the PF motor 35, or is provided so as to be driven by the rotation of other rollers rotated by the driving force of the PF motor 35 or the conveyance of the original P. It has been.

The paper discharge tray 34 is a part for receiving the original P that is discharged after passing through the conveyance path 36. When performing scanning (reading) using the cut-sheet paper platen 213, the document reading apparatus 10 has the upper part from the portion indicated by A in FIG. 1 as the fulcrum on the back side (the back of the paper surface in FIG. 1). Opening upward, the single-sheet original P is placed on the single-sheet original table 213. Further, in order to facilitate ink replacement of the printer function unit 50, the upper part from the portion indicated by B in FIG. 1, that is, the upper part from the printer function unit 50, uses the back side (the back of the paper surface in FIG. 1) as a fulcrum. It opens (rotates) upward.

The ADF motor 35, which is a scanner transport motor and serves as a drive motor, is a stepping motor. In the present embodiment, for example, fine steps such as 4W1-2 phase excitation are performed via an ASIC 207 and a motor driver 208 described later. Can be driven,
Document feeding corresponding to reading of a document P at high resolution is possible. ADF motor 3
As shown in FIG. 2, 5 is fixed to the motor holder 40, and the motor holder 40 is fixed to the housing 31 by being attached to a fixing portion inside the housing 31. ADF
The motor holder 40 to which the motor 35 is attached is formed of a plastic material having a predetermined heat resistance temperature higher than room temperature, for example, about 150 degrees. The motor holder 40 may be deformed when the temperature reaches a heat resistant temperature. Further, in the vicinity of the ADF motor 35, a conveyance roller group 33 and the like are densely arranged. The space around the ADF motor 35 is narrow,
It takes a relatively long time to release heat from this space to the outside world. Therefore, only by driving the ADF motor 35 for a short time, the temperature of the ADF motor 35 and the motor holder 40 to which it is attached rises.

The motor holder 40 is shaped like a case and has a case bottom 41 serving as the bottom, and an upper portion (a portion on the upper side of FIG. 2 and the upper side when installed) so as to surround the case bottom 41.
The upper wall portion 42, the lower wall portion 43 at the lower portion (the lower portion in FIG. 2 and the lower portion when installed), and one side wall portion 44, 44 on each side. Have. Each of the wall portions 42, 43, 44 extends in the horizontal direction. The case bottom 41 has one mounting through-hole 41a into which the drive gear 35a (see FIG. 5) of the ADF motor 35 is inserted, and controls the planetary gears of the transport roller group 33 and the cooling through of the ADF motor 35. A plurality of holes 41b are provided. Further, in order to attach the ADF motor 35, two attachment portions 41 c slightly protruding from the case bottom surface 41 are provided on the case bottom surface 41 with a gap therebetween. The attachment portions 41c and 41c are provided with screw holes 41d, respectively. Further, in the upper wall portion 42 and the lower wall portion 43 of the motor holder 40, the portions located at the lower and upper portions of the ADF motor 35 are notched space portions 42 a and 4, respectively, in which a part thereof is notched.
3a is provided. The notch spaces 42a and 43a serve to increase the amount of air passing through the gap S (see FIG. 5) between the bottom surface 35b (see FIG. 5) of the ADF motor 35 and the case bottom surface 41, and the motor holder 40. Considering miniaturization of

As shown in FIGS. 4 and 5, the ADF motor 35 includes a flange member 35 d having a bottom surface 35 b and two mounting flange portions 35 c extending on both sides of the bottom surface 35 b. In addition to the flange portions 35c and 35c for attachment, an enlarged flange portion 35e that connects the flange portions 35c and 35c for attachment, as shown by an alternate long and short dash line in FIG.
You may provide so that the bottom face 35b of the motor 35 may be enclosed. Flange 35c, 3 for mounting
5c is provided with a screw hole 35f.

The ADF motor 35 has flange portions 35c and 35c for mounting the mounting portion 41c.
, 41c, and firmly fixed to the motor holder 40 with screws 46, 46 (FIG. 5).
reference). At this time, the bottom surface 35b of the ADF motor 35 and the case bottom surface 41 of the motor holder 40
A gap S is generated between the ADF motor 35 and the ADF motor 35 in a floating state. This AD
The heat resistance limit temperature of the F motor 35 is 130 ° C.

FIG. 6 is a plan view showing a base portion of the printer function portion of the multifunction printer 1 according to the embodiment of the present invention. The document reading device 10 is arranged on the upper portion (the paper surface side in FIG. 6) of the printer function unit 50. The document reading apparatus 10 is connected and fixed to the printer function unit 50 on the back side (upper side in FIG. 6) of the printer function unit 50. The document reading apparatus 10 is rotatable about the back side of the printer function unit 50 as a fulcrum. With this configuration, the ink can be easily replaced or replenished.

The printer function unit 50 includes a base housing 51 as a housing. The base housing 51 includes a substantially rectangular flat plate-shaped bottom portion 53 and four wall portions 54, 55, 56, 57 erected along the entire circumference of the rectangular outer periphery of the bottom portion 53. By the bottom 53 and the four walls 54, 55, 56, 57, the base housing 51 has a box shape without a lid. The base housing 51 is formed of a plastic material having a predetermined heat resistance temperature higher than room temperature, for example, about 150 degrees. The base housing 51 may be deformed when the temperature reaches a heat resistant temperature.

On the base housing 51, an upper housing (not shown) is attached. By attaching the upper housing, the four wall portions 54 of the base housing 51,
The internal space 58 partitioned by 55, 56, 57 and the bottom 53 is almost isolated from the outside world, which is a space where the printer multifunction device 1 is installed. An internal space 58 of the base housing 51 is formed with a ventilation slit 59 formed in the wall portion 54 on the back side (upper side in FIG. 6).
In addition, a small gap between the upper housing and the like partially communicates with the outside world. Note that the outer surfaces of the walls 55 and 57 opposite to the inner space 58 are covered with the upper housing and are not exposed to the outside.

In the base housing 51, an LD (load) roller 61, a PF (paper feed) roller 62, a paper discharge roller 63, and the like are disposed. The LD roller 61, the PF roller 62, and the paper discharge roller 63 have a substantially round bar shape. The LD roller 61, the PF roller 62, and the paper discharge roller 63 are arranged substantially parallel to each other along the longitudinal direction of the bottom 53 of the base housing 51.

A sheet serving as a print medium is disposed below the base housing 51 (in FIG. 6, on the back side of the sheet). A paper feed tray (not shown) for placing paper is inserted into or removed from the base housing 51 from the front (lower side in FIG. 6). The paper to be printed is pulled out from the back side of the paper feed tray and transported to the top (the paper surface side in FIG. 6), and then transported in the direction indicated by the arrow W in FIG. It is discharged to the front side (arrow W direction).

The LD roller 61, the PF roller 62, and the paper discharge roller 63 disposed in the base housing 51 are rotatably supported by a pair of wall portions 55 and 57 in the longitudinal direction of the bottom 53 of the base housing 51. Hereinafter, a pair of wall portions 55 and 57 that support the LD roller 61 and the like are provided.
When distinguishing from the remaining wall parts 54 and 56, they are called bearing wall parts 55 and 57.

A PF motor 65 serving as a drive motor and a printing transport motor is disposed on one of the pair of bearing walls 55 and 57. In FIG. 6, the PF motor 65 is attached to the left bearing wall 57.
Is disposed. The PF motor 65 is a small stepping motor, and its heat resistant limit temperature is 130 ° C. The PF motor 65 is, for example, screwed to the bearing wall 57 and disposed in the area of the internal space 58 of the printer function unit 50. In this attached state, the rotating shaft of the PF motor 65 is inserted into a through hole (not shown) formed in the bearing wall portion 57. The tip end portion of the rotating shaft of the PF motor 65 protrudes outside the bearing wall portion 57. A drive gear 66 is fixed to a tip portion protruding outward of the bearing wall portion 57. The attachment structure of the PF motor 65 to the bearing wall portion 57 is the same as the attachment structure of the ADF motor 35 shown in FIGS.

As shown in FIG. 6, the PF motor 65 is disposed between the PF roller 62 and the paper discharge roller 63. The drive gear 66 is positioned outside the bearing wall portion 57 between the PF roller 62 and the paper discharge roller 63. The LD roller 61, the PF roller 62, and the paper discharge roller 63 have driven gears 67, 68, and 69 at their ends. The plurality of driven gears 67, 68, and 69 are fixed to tip portions of these rollers 61, 62, and 63 that protrude outward from the bearing wall portion 57, similarly to the drive gear 66. Further, between the PF roller 62 and the LD roller 61, an idler gear 70 whose rotation shaft projects to the outside of the bearing wall portion 57 is rotatably disposed.

The driven gear 68 of the PF roller 62 and the driven gear 69 of the paper discharge roller 63 are engaged with the drive gear 66. The driven gear 68 of the PF roller 62 and the driven gear 67 of the LD roller 61 are meshed with the idler gear 70. For example, when the drive gear 66 rotates counterclockwise when viewed from the left side in the posture shown in FIG. 6, the driven gear 68 of the PF roller 62 and the driven gear 69 of the paper discharge roller 63 rotate clockwise. The idler gear 70 rotates counterclockwise as opposed to the driven gear 68 of the PF roller 62. The driven gear 67 of the LD roller 61 rotates in the clockwise direction opposite to the idler gear 70. In this way, the three rollers of the LD roller 61, the PF roller 62, and the paper discharge roller 63 rotate in the same direction.

A platen 71 is disposed between the PF roller 62 and the paper discharge roller 63. Platen 7
1 has a long shape that fits between the PF roller 62 and the paper discharge roller 63. A pair of flushing holes 72 are formed at both longitudinal ends of the platen 71.

A carriage 73 indicated by a one-dot chain line in FIG. 6 is disposed above the platen 71, that is, on the front side in FIG. The carriage 73 is supported by a carriage shaft (not shown). The carriage shaft is disposed substantially parallel to the PF roller 62. The carriage 73 is movable in a direction parallel to the axial direction of the PF roller 62, that is, a direction orthogonal to the conveyance direction of the sheet serving as the printing medium. As a result, the carriage 73 moves on the platen 71.

The carriage 73 has an ink tank 74 and a recording head 75 (see FIG. 8). The ink tank 74 stores ink. The recording head 75 has a plurality of ink ejection nozzles. The ink in the ink tank 74 is supplied to the plurality of ink discharge nozzles. Piezo elements are disposed in the ink discharge nozzles. The piezoelectric element is deformed according to the applied voltage. When the piezo element is deformed, the ink in the ink discharge nozzle is pushed out.
The ink pushed out from the ink discharge nozzle moves in the internal space 58 of the printer function unit 50 toward the platen 71. If there is a sheet as a printing object between the platen 71 and the recording head 75, the ink adheres to the sheet. The range in which the recording head 75 ejects ink toward the platen 71 as the carriage 73 moves is the print position on the paper.

<Configuration of control unit>
FIG. 7 is a block diagram showing the main configuration of the scanner function unit in the control system of the multifunction printer 1 having the document reading apparatus 10 of FIG. Note that FIG. 7A shows the overall configuration, and FIG.
FIG. 7B shows a part of the detailed configuration in FIG. The printer multifunction machine 1 has a scanner function, a printer function, a copy function, a facsimile function, and a direct function for printing a photo directly from image data of a digital camera or a mobile phone.
In FIG. 7, for the sake of explanation, the scanner function unit is mainly configured.

As shown in FIG. 7A, the control unit 100 of the document reading apparatus 10 includes a printer function unit 50,
The image data is output to an external device such as a computer COM and an external storage device MEM (memory card, hard disk drive, etc.) provided inside and outside the device. This control unit 100
Is a CPU (Central Processing Unit) 101,
CCD driver 102, image processing circuit 103, memory control circuit 104, memory 105, interface 106, ASIC (Application Specific Inte
(gated Circuit: application specific integrated circuit) 107, motor driver 108
, Bus 109 and the like. Further, the control unit 100 serves as a main part of the motor drive device and corresponds to a determination unit and a motor control unit.

Among these, the CPU 101 is a part that controls the entire operation of the document reading apparatus 10 by executing various data and programs. As shown in FIG. 7B, the CPU 101 includes a timer 111 as a time measuring means, and a memory 1 as a storage means and a non-loss storage means.
12 and. The timer 111 measures time. The timer 111 counts the elapsed time after the power is turned off for a predetermined time (13 minutes in this embodiment) even after the printer multifunction device 1 is turned off. That is, a kind of back energization is performed and the timer 111 is operated. After a lapse of a predetermined time, the elapsed time and the accumulated heat storage amount at that time (details will be described later) are stored in EEPROM (Elect
tropically Erasable and Programmable Read
It is stored in the memory 112 consisting of “Only Memory”, and the energization of the timer 111 is turned off. When the printer multifunction device 1 has not been operated for a predetermined time or more before the power is turned off, the timer 111 does not perform counting after the power is turned off, that is, back energization. The value of 13 minutes takes into account the balance between energy saving and accurate calculation of heat storage.
It is preferably from 20 minutes to 20 minutes, most preferably from 10 minutes to 15 minutes. The CPU 101 serving as a subtracting unit subtracts the heat storage amount corresponding to the predetermined time from the accumulated heat storage amount when the power is turned on after the lapse of a predetermined time, and when the power is turned on before the lapse of the predetermined time, The heat storage amount corresponding to the time from turning off to power on is subtracted from the cumulative heat storage amount.

The memory 112 corrects the last sheet feeding time data 113, the accumulated heat storage data 114, the waiting time data 115, the single sheet heating value table 116, and the correction coefficient at the time of scanning, that is, the single sheet heating value table 116 at the time of scanning. Correction coefficient table 117 used for
Is saved. The last paper feed time data 113 is data indicating the past time of the last paper feed. The cumulative heat storage data 114 is data indicating the cumulative heat storage amount due to the heat generated by the ADF motor 35. The accumulated heat storage data 114 changes in conjunction with the temperature of the ADF motor 35 itself and the housing 31 to which it is attached. The waiting time data 115 is data indicating a time during which the driving of the ADF motor 35 is prohibited. In this embodiment, the cut sheet calorific value table 116 uses the cut sheet calorific value table 156 described later as it is, and is not stored in the memory 112. However, a single sheet heat generation amount table 116 may be provided separately from the single sheet heat generation amount table 156 described later. This single sheet calorific value table 11
6 and the correction coefficient table 117 will be described later.

In the present embodiment, the CPU 101 implements a scanner control unit 101a, an open control unit 101b, and a control command value generation unit 101c by executing a predetermined control program. The scanner control unit 101a instructs a motor (not shown) for driving the irradiation carriage 221 and a command for driving the image sensor 232 to start a document reading operation according to a reading mode, stop a document reading operation, and the like. The value is obtained from the CCD driver 102, ASIC.
Output to 107. Further, the open control unit 101b outputs a command value for causing the ADF motor 35 to conduct a current as shown in FIG. The scanner control unit 101a corresponds to a sequence control unit, and specifically, for example,
As shown in FIG. 7B, a sequence selection unit 121, a paper feed control unit 122 as a drive control unit and a supply control unit, a scan control unit 123 as a subtraction unit and a scan control unit, and a paper feed control unit And a paper discharge control unit 125 serving as a heat generation amount acquisition unit, a waiting time determination unit, and a discharge control unit. Since these functions and the control command value generation unit 101a described above are the same as or similar to those of the printer function unit 50 described later, the description thereof will be given later.

The CCD driver 102 drives the image sensor 232 every predetermined time, and
An analog electrical signal from the image sensor 232 is captured, and a digital signal corresponding to the amount of charge is formed and output to an image processing circuit. The image processing circuit 103 forms image data having RGB gradation values for each pixel based on the digital signal output from the CCD driver 102, and the formed image data is stored in the image data buffer 1 of the memory 105.
Store in 05a.

When the address information is supplied from the CPU 101, the memory control circuit 104 starts its operation, designates the addresses in order from the head address, and sequentially reads out the designated number of data from the memory 105 via the bus 109. , Output to the interface 106.

The memory 105 is an external memory that stores various data and programs such as a DRAM. The memory 105 includes an image data buffer 105a for temporarily storing image data, a drive table such as FIG. 12 for driving the ADF motor 35, and FIG.
Table storage unit 10 for storing a determination table and the like and a correction coefficient at the time of scanning
5b etc. Then, the CPU 101 can read out the drive table as shown in FIG. The above-mentioned memory 105 also stores predetermined data necessary for others.

The interface 106 is a circuit for outputting image data to the printer function unit 50 and appropriately converting and inputting a representation format of signals output from an input device (not shown) and the external storage device MEM. .

Based on the command value from the CPU 101, the ASIC 107 outputs a signal related to the current value, frequency, and the like for driving the ADF motor 35 and other various motors to the motor driver 108. The motor driver 108 conducts a rectangular wave current having a frequency corresponding to the signal from the ASIC 107 to the ADF motor 35 and the like. Bus 109 is CP
This is a signal transmission path for connecting U101, CCD driver 102, image processing circuit 103, memory control circuit 104, memory 105, image sensor 232, ASIC 107, and the like. The bus 109 is also connected to the control system of the printer function unit 50.

FIG. 8 is a block diagram showing the main configuration of the control system of the printer function unit 50 of the printer multifunction device 1. As described above, the MFP 1 has a scanner function, a printer function, a copy function, a facsimile function, and a direct function for printing a photo directly from image data of a digital camera or a mobile phone. In FIG. 8, for the sake of explanation, the printer function unit 50 is mainly configured.

The printer function unit 50 includes a recording head control circuit 131, a motor driver 132, and an ASIC.
133, a CPU 134 serving as a microcomputer, and the like. Note that the motor driver 108, the ASIC 107, and the CPU in the control unit 100 of the document reading apparatus 10 shown in FIG.
101, the motor driver 132 and the ASIC 133 of the printer function unit 50 shown in FIG.
, One CPU 134 may be used for both function units.

The recording head control circuit 131 is connected to a plurality of piezo elements provided in a plurality of ink ejection nozzles of the recording head 75. When the voltage waveform pattern is supplied, the recording head control circuit 131 applies a voltage waveform voltage according to the pattern to the plurality of piezoelectric elements.

The motor driver 132 is connected to the PF motor 65, the CR (carriage) motor 76, and the like. The CR motor 76 is, for example, a DC (direct current) motor, and drives the carriage 73 along the carriage axis via a drive transmission mechanism 77 such as a drive belt. The motor driver 132 outputs a pulse to a stepping motor such as the PF motor 65 described above. The motor driver 132 increases or decreases the number of pulses to the stepping motor, the pulse density, etc. according to the control command value. The motor driver 132 outputs a pulse voltage having a duty ratio according to the control command value to a DC motor such as the CR motor 76 described above. Thereby, the stepping motor such as the PF motor 65 and the DC motor such as the CR motor 76 rotate according to the control command value.

The ASIC 133 is a kind of microcomputer and has a memory 141. AS
The memory 141 of the IC 133 stores various control commands and detection information. Examples of the control command include a control command value 142 for the PF motor 65 and the CR motor 76, a voltage waveform pattern 143 supplied to a plurality of piezo elements, and the like. The detection information includes, for example, a detection speed 144 such as a paper feed speed and a movement speed of the carriage 73, and a detection movement amount 145 such as a paper feed amount and a movement amount of the carriage 73.

Further, a control unit 146 is realized in the ASIC 133. The control unit 146 is realized by a CPU (not shown) of the ASIC 133 executing a control unit program (not shown). The control unit 146 operates periodically. And the control unit 146
Supplies the control command value 142 stored in the memory 141 of the ASIC 133 to the motor driver 132, and the voltage waveform pattern 1 stored in the memory 141 of the ASIC 133
43 is supplied to the recording head control circuit 131, and the pulses generated in accordance with the movement of the carriage 73 and the paper feed are counted. The control unit 146 updates the detection speed 144 stored in the memory 141 of the ASIC 133 based on the pulse count value per unit time, and stores it in the memory 141 of the ASIC 133 based on the cumulative pulse count value. The detected movement amount 145 is updated.

The CPU 134 includes a timer 151 as time measuring means, and a memory 152 as storage means and non-loss storage means. The timer 151 measures time. Timer 151 is
Even after the power of the printer multifunction device 1 is turned off, the elapsed time after the power is turned off is counted for a predetermined time (in this embodiment, 13 minutes). That is, a kind of back energization is performed and the timer 151 is operated. After a predetermined time has elapsed, the elapsed time is stored in the memory 152, and the energization of the timer 151 is turned off. When the printer multifunction device 1 has not been operated for a predetermined time or more before the power is turned off, the timer 151 does not perform counting after the power is turned off, that is, back energization. CPU
A memory 152 of 134 stores various data used for print control. In addition, when the power supply is turned on after elapse of a predetermined time, the CPU 134 serving as a subtracting unit subtracts the heat storage amount corresponding to the predetermined time from the accumulated heat storage amount, and when the power supply is turned on before the elapse of the predetermined time. Then, the heat storage amount corresponding to the time from power-off to power-on is subtracted from the accumulated heat storage amount. CPU134
The memory 152 stores, for example, final paper feed time data 153, accumulated heat storage data 154, waiting time data 155, a single sheet calorific value table 156, and the like. Last feeding time data 15
3, the accumulated heat storage data 154, the waiting time data 155, the single sheet heat generation amount table 156, etc., for example, EE so as not to disappear even when the printer multifunction device 1 is turned off.
It is stored in a non-volatile memory such as PROM. It should be noted that the correction coefficient table 117 at the time of scanning stored in the memory 112 of the control unit 100 of the document reading apparatus 10, that is, the coefficient sheet 1 used for correcting the sheet heating value table 116 and its value at the time of scanning.
17 may be provided in the memory 152. Another value, ie memory 112
Various data to be saved in the memory 152 may be held in the memory 152.

The correction coefficient table 117 has two correction coefficients, a first scan coefficient and a second scan coefficient. The first scan time coefficient (details will be described later) is for correcting the heat addition amount (details will be described later) when the document reading apparatus 10 is operating according to the scan resolution. The second scanning coefficient (details will be described later) is used to correct the heat addition amount (details will be described later) when the document reading apparatus 10 is operating in accordance with the size of the scanned portion. is there.

The last paper feed time data 153 is data indicating the past time when the last paper feed was performed. This data and the final feed time data 113 of the document reading apparatus 10 are the same type. For example, when the paper feeding operation is performed twice, the time of the final paper feeding time data 153 is the time when the second paper feeding is started. The cumulative heat storage data 154 is data indicating the cumulative heat storage amount due to the heat generated by the PF motor 65. The accumulated heat storage data 154 changes in conjunction with the temperature of the PF motor 65 itself and the bearing wall 57 to which it is attached. The waiting time data 155 is
This is data indicating the time during which the driving of the PF motor 65 is prohibited.

As described above, the ADF motor 35 is fixed to the motor holder 40, and the motor holder 40 is attached to a fixed portion inside the housing 31.
Fixed to. Since the transport roller group 33 and the like are densely arranged in the vicinity of the ADF motor 35, the space around the ADF motor 35 is narrow, and it takes a relatively long time to radiate heat from this space to the outside. Therefore, the ADF motor 35 is driven only for a short time.
And the temperature of the motor holder to which it is attached rises. The PF motor 65 is similar to that shown in FIG.
As shown in FIG. 4, the printer function unit 50 is disposed in the internal space 58. This internal space 58 is
It is isolated from the outside by the base housing 51 and the upper housing. Moreover, PF
Around the motor 65, a PF roller 62, a paper discharge roller 63, a platen 71, and the like are densely arranged. The space around the PF motor 65 is narrow, and it takes a relatively long time to radiate heat from this space to the outside. Therefore, only by driving the PF motor 65 for a short time, the PF motor 6
5 and the temperature of the bearing wall 57 to which it is attached rises.

The CPU 134 implements a control command value generation unit 157 and a sequence control unit 158. The control command value generation unit 157 and the sequence control unit 158 are realized by the CPU 134 or another CPU executing a control program (not shown). This CP
The control program executed in U134 may be stored in the memory 152 of the CPU 134, for example. Even if the control program stored in the memory 152 of the CPU 134 is stored in the memory 152 before the shipment of the multifunction printer 1, the memory 1 is stored after the shipment.
52 may be stored. The control program stored in the memory 152 after shipment is provided to the user in a state stored in a computer-readable recording medium such as a CD-ROM, or is provided to the user via a data transmission medium such as the Internet. can do. A part of the control program stored in the memory 152 may be provided to the user by a computer-readable recording medium or a transmission medium. The same applies to the control unit program executed by the ASIC 133.

The control command value generation unit 157 generates the control command value 142 periodically. The control command value generation unit 157 periodically designates a control deviation between the designated target position and the detected movement amount 145 or a designated value when the carriage 73 or the target position or the target speed for paper conveyance is designated. A new control command value 142 is generated so that the control deviation between the target speed and the detected speed 144 is reduced.
The control command value 142 includes, for example, a control command value 142 for the PF motor 65 and the CR motor 76.
There is. In the control command value 142 to the PF motor 65, for example, the number of pulses and the pulse density are specified. In the control command value 142 to the CR motor 76, for example, a duty ratio is designated. The control command value generation unit 157 stores the generated control command value 142 in the memory 1 of the ASIC 133.
Write to 41. The control command value generation unit 157 has the same operation and function as the control command value generation unit of the document reading apparatus 10.

The sequence control unit 158 selects a control sequence executed by the printer function unit 50. Further, the sequence control unit 158 executes the selected control sequence. Specifically, the sequence control unit 158 includes, for example, a sequence selection unit 161, a paper feed control unit 162 as a drive control unit and a supply control unit, a print control unit 163 as a subtraction unit and a print control unit, and a paper feed A control unit 164 and a paper discharge control unit 165 as a heat generation amount acquisition unit, a waiting time determination unit, and a discharge control unit are included. The sequence control unit 158 has the same operation and function as the sequence control unit of the document reading apparatus 10.

The paper feed control unit 162 executes a paper feed sequence. In the paper feed sequence, the PF motor 6
The LD roller 61 and the PF roller 62 are rotationally driven in accordance with the drive control 5. As a result, the paper placed on the paper feed tray is fed to the printing position. The paper feed control unit 162
Specifically, the control command value generation unit 157 specifies the target position, target speed, and the like of the PF motor 65 for paper supply in accordance with the paper supply sequence. The paper feed control unit 162 periodically updates values such as the target position and target speed of the PF motor 65 specified in the control command value generation unit 157.

The print control unit 163 executes a print sequence. In the printing sequence, CR motor 7
The carriage 73 moves according to the drive control No. 6. Further, the recording head 75 ejects ink based on the voltage waveform pattern 143. As a result, the paper at the printing position is 1
Ink for the scan adheres. Specifically, the print control unit 163 designates the target position, target speed, and the like of the CR motor 76 for driving the carriage 73 in accordance with the print sequence to the control command value generation unit 157, and the memory of the ASIC 133 In 141, a voltage waveform pattern 143 for one scan based on the print data is written. The print control unit 163 periodically
Values such as the target position and target speed of the CR motor 76 specified in the control command value generation unit 157 are updated.

The paper feed control unit 164 executes a paper feed sequence. In the paper feed sequence, the PF roller 62 and the paper discharge roller 63 are rotationally driven according to the drive control of the PF motor 65.
As a result, the paper at the printing position is fed with a predetermined paper feed amount (for example, the print width of the recording head 75).
Sent by. Specifically, the paper feed control unit 164 specifies the target position and target speed of the PF motor 65 for paper feed to the control command value generation unit 157 according to the paper feed sequence. The paper feed control unit 164 periodically updates values such as the target position and target speed of the PF motor 65 specified to the control command value generation unit 157.

The paper discharge control unit 165 executes a paper discharge sequence. In the paper discharge sequence, the PF motor 6
The PF roller 62 and the paper discharge roller 63 are rotationally driven according to the drive control of No. 5. As a result, the sheet at the printing position is discharged out of the printer multifunction device 1. The paper discharge control unit 165
Specifically, the control command value generation unit 157 specifies the target position, target speed, and the like of the PF motor 65 for paper discharge according to the paper discharge sequence. The paper discharge control unit 165 periodically updates values such as the target position and target speed of the PF motor 65 specified to the control command value generation unit 157.

The sequence selection unit 161 selects one of a plurality of control execution units such as the paper feed control unit 162, the print control unit 163, the paper feed control unit 164, and the paper discharge control unit 165. Specifically, the sequence selection unit 161 reads the status information of the printer function unit 50 from the memory 141 of the ASIC 133, and selects one control unit according to the status information. The sequence control unit 158 instructs the selected control unit to execute control.

FIG. 9 is an explanatory diagram showing a data structure of the single sheet heat generation amount table 156 in FIG. 8 (used as the single sheet heat generation amount table 116 in FIG. 7). The single sheet calorific value table 156 stores a plurality of rising temperatures of the PF motor 65 for each printing time period (paper feeding time) of one printing medium such as one A4 sheet. Each value is added to the past data as an estimated heat generation amount. The temperature of the PF motor 65 increases according to the amount of heat generated by the PF motor 65. The temperature of the PF motor 65 corresponds to the amount of heat generated by the PF motor 65. The single-sheet heating value table 156 shown in FIG. That is, the single sheet heat generation amount table 116 is the same as the single sheet heat generation amount table 156. Single sheet calorific value table 116
Indicates the time for reading one sheet (the time from the start of paper feed to the completion of paper discharge)
A plurality of rising temperatures of the F motor 35 are stored. The temperature of the ADF motor 35 depends on the ADF motor 3
It rises according to the calorific value of 5. The temperature of the ADF motor 35 corresponds to the amount of heat generated by the ADF motor 35.

The cut sheet printing time is, for example, the printing time for one sheet of sheet paper such as postcard or A4. The length of the cut sheet printing time varies depending on the size of the paper to be printed, the type of print data to be printed, the print range on the paper to be printed, and the like. The printer multifunction device 1 has a plurality of print modes corresponding to the size of paper to be printed, the type of print data to be printed, the print range on the paper to be printed, and the like. The printing mode of the multifunction printer 1 includes, for example, A4 plain paper printing (normal) mode for printing on A4 size plain paper at a normal resolution, and A4 plain paper printing for printing on A4 size plain paper at a low speed at high speed. (Economy) mode, postcard borderless photo printing mode for printing a photographic image without borders on a postcard, and A4 borderless photo printing mode for printing on A4 size photo paper at a high resolution.

Then, the single sheet calorific value table 156 in FIG. 9 indicates the time from the start of paper feed to the completion of paper discharge (FIG. 9).
Then, the value of 1/10 of the written value is seconds) and the estimated heat generation at that time (= temperature rise value, in FIG. 9, the value of 1/100 of the written value is degree (° C.)) Is displayed. More specifically, the single-sheet printing time, which is the time required for printing on one single-sheet paper, is defined as a time zone of 0 to 2.3 seconds, a time zone of 2.4 to 2.8 seconds, and 2. 9-3.3 seconds time zone, 3.4-3.8 seconds time zone, 3.9-4.3 seconds time zone, 4.4-5.0 seconds time zone, 5.1- The temperature is divided into a plurality of time zones such as a time zone of 6.0 seconds, and the temperature rise per printing of the PF motor 65 is stored for each time zone. Further, the single sheet calorific value table 156 of FIG. 9 also stores the rising temperature of the PF motor 65 in the cleaning mode. 9 may be stored in the CPU 101 of the document reading apparatus 10 as well, but it is preferable that one of the CPU 101 and the CPU 134 is shared. In this embodiment, for convenience of explanation, it is assumed that the same sheet heating value table 156 is stored in the CPU 101 as well. In this case, the single-tablet calorific value table of the CPU 101 is divided for each time described above, and represents the rising temperature when one ADF motor 35 is scanned for each time zone.

10 and 11 show scanning correction coefficients stored in the memory 105 of the control unit 100 of the document reading apparatus 10, that is, the single sheet heat generation amount table 116 (= the single sheet heat generation amount table 156).
) Shows an example of a correction coefficient table 117 for correcting the amount of heat generated estimated from () during scanning. FIG. 10 shows the first scan coefficient, and FIG. 11 shows the second scan coefficient.

The first scanning coefficient shown in FIG. 10 is for correcting a heat generation amount estimated when the document reading apparatus 10 is operating in accordance with the scan resolution to obtain a more correct heat generation amount. . In the example shown in FIG. 10, when the resolution is 75 to 100 dpi, the coefficient is “1”, 101
The coefficient is "0.9" at -200 dpi, the coefficient is "0.8" at 201-300 dpi, 3
The coefficient is “0.7” for 01 to 400 dpi, and the coefficient is “0.6” for 401 or more. As will be described later, this is because when the resolution is high, the current value for driving the ADF motor 35 decreases. Further, when the document P is read at a high resolution in the ADF device 30, the capacity of the memory 105 may be insufficient, and in this case, the ADF device 30 may be temporarily stopped. When the resolution is high, the data transfer speed is
This is because there are cases where the data reading speed of the image sensor 232 is slower, and in such a case, the ADF device 30 may be temporarily stopped.

The second scan time coefficient shown in FIG. 11 corrects the estimated amount of heat generated when the document reading apparatus 10 is operating in accordance with the size of the scanned portion to obtain a more correct amount of heat generated. Is for. In the example shown in FIG. 11, when the reading length is one page, the coefficient is “1.00.
"The coefficient is" 1.08 "for 2/3 pages to less than 1 page, and the coefficient is" 1.08 for pages 1/2 to 2/3 ".
1.12 ", the coefficient is" 1.16 "for 1/3 page to less than 1/2 page, the coefficient is" 1.18 "for 1/4 page to less than 1/3 page, the coefficient for less than 1/4 page Is “1.20”. As will be described later, when there are few reading parts, the feed speed outside the reading area becomes faster,
This is because the driving current at that time becomes large. For this reason, the smaller the reading area, the greater the amount of heat generated by the ADF motor 35, so the coefficient is set to a large value.

FIG. 12 shows an example of a drive table stored in the table storage unit 105 b in the memory 105 of the document reading apparatus 10. As shown in FIG. 12, this drive table conducts a current value Imax for driving at the maximum speed Vmax at which self-start is possible at the stage of initial drive. Then, after driving at Vmax for a predetermined step, the current value is reduced to a current value Iout that is not in the pull-in region but is in the pull-out region. By controlling the current value in this way, it is possible to suppress the heat generation amount as will be described later.

FIG. 13 shows another example of the drive table. As shown in FIG. 13, this drive table conducts a current value Imax for driving at the maximum speed Vmax at which self-start is possible at the stage of initial drive. Then, after driving at Vmax for a predetermined step, the current value is reduced to a current value Iout that is not in the pull-in region but is in the pull-out region. Thereafter, the drive current is further lowered. Then, after driving with the current for a certain period of time, the current value is increased to a point close to the current value Iout. Then, the ADF motor is held (stopped), and then the driving is resumed in the pull-in region. By controlling the current value in this way, it is possible to suppress the heat generation amount as will be described later.

FIG. 14 shows an example of a determination table stored in the table storage unit 105 b in the memory 105 of the document reading apparatus 10. As shown in FIG. 14, this determination table is a table for determining whether or not the reading of the document P is interrupted according to the reading resolution (scanning resolution) designated by the user or the like. As shown in FIG. 14, interruption is likely to occur when reading at a high resolution, and no interruption occurs when reading at a low resolution. In addition, the driving current at the time of reading at high resolution is large at the start-up, but is small at a constant speed.
On the other hand, at low resolution, the ADF motor 35 is always driven with a large current.

<About drive control of scanner transport motor>
The drive control of the ADF motor 35 in the ADF apparatus 30 of the document reading apparatus 10 having the above configuration will be described with reference to FIG.

When the reading of the document P is instructed by the user and the presence of the document P on the paper feed tray 32 is detected by detection by a sensor (not shown), the CPU 101 starts driving the ADF motor 35. Thereby, the feed roller 3 constituting the transport roller group 33 is provided.
31, the paper feed roller 333 and the like are rotated, and an operation for driving the original P to a predetermined position at a high speed is started (step S01).

When the document P is taken in by the paper feed roller 331 and the document P travels along the transport path 36, the document P reaches the paper feed roller 333. Then, when it is detected by a sensor (not shown) that the document P has traveled along the transport path 36 and has reached a predetermined position, the document P
Is stopped once at that position (step S02). Note that such a stop may not be interposed.

By the way, when the high-resolution reading mode is designated, there is a case where the memory capacity is insufficient and a so-called overflow state occurs, or the data transfer speed at the interface 106 is slow and the overflow state may also occur. Therefore, the CPU 101 determines whether or not the reading of the document P by the ADF device 30 is interrupted based on the reading mode by the user and information such as the size of the document P (step S03). In this determination, the CPU 101 reads a predetermined determination table from the table storage unit 105b of the memory 105, and performs the determination based on the determination table. However, it may be determined whether or not the calculation causes an interruption.

FIG. 14 is an example of a determination table. As shown in FIG. 14, in the CPU 101,
The determination of whether or not the driving of the ADF motor 35 is interrupted based on the determination table is performed based on the scan resolution (reading resolution). As shown in FIG. 14, when the scan resolution is high, there is an interruption, the drive current (= drive current at a constant speed) is small, and the motor speed is slow. On the other hand, if the scan resolution is low, there is no interruption,
The drive current is increased and the motor speed is increased.

In step S03, the resolution is rough and the memory capacity is not short (
If it is determined that the reading of the document P is not interrupted (No), the ADF motor 35 is driven in a high-speed reading mode in which acceleration / deceleration exists thereafter (step S).
04). In the reading mode in which such acceleration / deceleration exists, the document P is read after the acceleration is performed in the pull-out region by a predetermined amount to stabilize the driving speed for high-speed driving. Then, after step S04, the same determination as in step S09 described later is performed (
Step S05), it is determined whether or not the part where the driving of the ADF motor 35 is stopped is reached. If the determination is Yes, the process proceeds to step S10 and the process is terminated. If the determination in step S05 is No, the process returns to step S04.

When it is determined in step S03 that there is an interruption (that is, when a high-resolution reading mode is specified and the memory capacity is insufficient; in the case of Yes), FIG.
2 or / and driving based on a driving table as shown in FIG. FIG.
FIG. 13 is a diagram showing a simplified driving table (current command value), and FIG. 13 is a diagram showing the driving table (current command value) and the actual current value (the actual current value is a broken line). Note that FIG. 13 also shows a case where, for example, the polarity of the current in the A phase is reversed as the ADF motor 35 rotates. Thereafter, the ADF motor 35 is controlled and driven based on the drive table.

Here, in the first stage of driving based on the driving table (at the time of starting), the frequency of the current value to be conducted to the ADF motor 35 is set to be a frequency corresponding to the reading speed. In addition, the current value (the amplitude of the pulse current) that is conducted to the ADF motor 35 can realize a reading speed corresponding to the resolution from the time of activation, and can be activated automatically (that is, a higher value).
(Step S06). Then, a current having such a current value and frequency is conducted to the ADF motor 35 by a predetermined number of steps. The predetermined number of steps is set to a number of steps that can suppress vibration when the ADF motor 35 starts to move from a stopped state and can stabilize the rotation.

Subsequently, it is determined whether or not the predetermined number of stabilization steps within the self-starting area has elapsed (step S07). The number of steps of this stabilization step is determined by the ADF motor 35
The number of steps is set to such a degree that the vibration when starting up is attenuated and the transition to the pullout region can be satisfactorily performed. As an example, when the ADF motor 35 is driven by 4W1-2 phase excitation, there are 96 steps.

If it is determined in step S07 that the number of stabilization steps has elapsed (in the case of Yes), then the CPU 101 (open control unit 101b) performs control to decrease the current value (step S08). At this time, the current value is reduced to the extent that it falls within the pull-out area, although the self-starting area is removed. Note that the CPU 101 (open control unit 101b) does not change the frequency and keeps it as it is. Thereby,
Although the ADF motor 35 is not driven in the self-starting area, the ADF motor 35 is in a state of continuing the paper feeding operation without being stepped out. If it is determined in step S07 that the predetermined number of steps in the self-activation area has not elapsed (in the case of No), the process returns to step S06.

Here, FIG. 16 is a diagram showing the relationship between the frequency and the torque before and after the current value is reduced, and the two-dot broken line shows the pull-in torque before the stabilization step (before the current value is lowered) and The pull-out torque, indicated by the solid line, indicates the pull-in torque and the pull-out torque after the stabilization step has elapsed (after the current value has been reduced), respectively. As is clear from FIG. 16, for example, the frequency of 750 pps in terms of driving in 2-2 phase excitation and the torque of 95 gf · cm is inside the pull-in torque (within the pull-in region) before the stabilization step. However, it is located in the pull-out region after the stabilization step.

Subsequent to step S08, the CPU 101 determines whether or not the part where the driving of the ADF motor 35 is stopped has been reached (step S09). In this case, the part to be stopped is whether or not the position where the reading of the original P is finished is reached. ADF motor 3
If it is determined that the drive to stop the driving of No. 5 has been reached (in the case of Yes), the driving of the ADF motor 35 is stopped (step S10), and the entire process is terminated.

If it is determined in the above-described determination that the reading of the document P has not been completed (in the case of No), then the CPU 101 determines whether or not it has reached the part where the driving of the ADF motor 35 is interrupted (step). S11). This determination is made based on whether or not the ADF motor 35 has been driven by a predetermined number of steps. However, the image sensor 23
2, whether or not to stop the ADF motor 35 is determined based on a comparison between the input of data from 2 and the fact that a queue indicating that a predetermined amount of data has been transmitted is transmitted to the CPU 101 in the memory control circuit 104. You may make it do. If it is determined that the drive of the ADF motor 35 is not interrupted (No), the process returns to step S08.

In the above-described step S11, when it reaches the part where the ADF motor 35 is interrupted (in the case of Yes), the ADF motor 35 is stopped and reading is interrupted (step S).
12). Then, based on the fact that a queue indicating that a predetermined amount of data has been transmitted is transmitted from the memory control circuit 104 to the CPU 101, it is determined whether or not the driving of the ADF motor 35 is to be resumed (step S13). In this determination, when it is determined that the driving of the ADF motor 35 is resumed (in the case of Yes), the process returns to step S06 described above. If it is determined not to restart the driving of the ADF motor 35 (No), the process returns to step S12.

By performing the processing as described above, the reading of the document P is completed. The processing flow in FIG. 15 is merely an example. At the time of activation, the ADF motor 35 is driven in the pull-in area, and after the stabilization step has elapsed, the ADF motor 35 is driven in the pull-out area. Any processing flow may be used as long as the operation for stopping the driving can be realized.

Next, a control operation in consideration of the amount of heat generated by the motor in the document reading device 10 and the printer function unit 50 of the multifunction printer 1 will be described with reference to FIGS. This control is shown in FIG.
It can be said that the processing flow of No. 5 has been replaced with one that takes into account the amount of heat generated by the motor. The basic operation will be described with reference to a scanning operation in the document reading apparatus 10, but the printer function unit 50.
The same control is performed at.

When a scan start button or the like (not shown) is pressed and scanning using the ADF apparatus 30 is started, the sequence control unit of the control unit 100 of the document reading apparatus 10 starts reading (scanning).

When the scan control is started, the sequence selection unit 123 of the sequence control unit (scanner control unit 101a) reads the status information of the document reading apparatus 10 from the memory of the ASIC 107 and confirms that the scan operation is possible. Thereafter, the paper feed control unit 122
Select. The scanner control unit 101a instructs the selected paper feed control unit 122 to perform paper feed control. The paper feed control unit 122 executes paper feed control according to a predetermined paper feed sequence.

FIG. 17 is a flowchart showing the flow of a paper feed sequence executed by the paper feed controller 122. Before actually starting the paper feed process, the paper feed controller 122 first acquires the current time from the timer 111 inside the CPU 101 and reads the last paper feed time data 113 from the memory 112 of the CPU 101 (step S21). ). The paper feed control unit 122 calculates the elapsed time by subtracting the time of the final paper feed time data 113 from the current time (step S22).
The paper feed control unit 122 updates the last paper feed time data 113 stored in the memory of the CPU 101 with the calculated elapsed time (step S23).

Further, the paper feed control unit 122 determines whether or not the calculated elapsed time is longer than a predetermined reset time (step S24). The predetermined reset time is, for example, A in the ADF device 30.
The time of the DF motor 35 is equal to or longer than the time for cooling from a predetermined heated temperature to the same temperature as the environmental temperature. The predetermined reset time is, for example, 3 hours.

Immediately after the printer multifunction device 1 is turned on, a time longer than a predetermined reset time usually elapses. In this case, the paper feed control unit 122 determines that the calculated elapsed time is longer than the predetermined reset time. The paper feed controller 122 executes a memory reset (step S2).
5). The paper feed control unit 122 resets values such as accumulated heat storage data 114 and waiting time data 115 relating to the ADF motor 35 that is a scanner transport motor stored in the memory 112 of the CPU 101 to predetermined initial values (for example, “0”). To do. When the time longer than the predetermined reset time has not elapsed, the paper feed control unit 122 determines that the calculated elapsed time is shorter than the predetermined reset time. The paper feed control unit 122 determines whether or not the waiting time is “0” (step S26). If No is determined in step S26, the process waits at the waiting time at that time (step S27).

When the memory is reset in step S25, or a Yes determination is made in step S26, or when step S27 ends, the accumulated heat storage data 114 and the waiting time data 115
The CPU 101 that has updated the values to the initial values starts measuring the time from the start of sheet feeding to the completion of sheet ejection (step S28). Specifically, for example, the CPU 101 determines that the timer 1
The elapsed time measured by 11 is reset, and time counting is started.

The CPU 101 that has started measuring the cut sheet printing time starts paper feed processing (step S29).
). The paper feed control unit 122 designates the target position and target speed of the ADF motor 35 for paper feed to the control command value generation unit 101c according to a predetermined paper feed sequence.

The control command value generation unit 101c calculates a control deviation between the specified target position and the detected movement amount, a control deviation between the specified target speed and the detected speed, and calculates a control command value that reduces the control deviation. . The control command value generation unit 101c calculates a control command value by, for example, PID control. The control command value generation unit 101 c writes the generated control command value in the memory of the ASIC 107.

The control unit of the ASIC 107 supplies the control command value stored in the memory inside the ASIC 107 to the motor driver 108. The motor driver 108 starts driving the ADF motor 35 with a pulse corresponding to the supplied control command value. As the ADF motor 35 rotates, the transport roller group 33 and the like rotate. The paper placed on the paper feed tray 32 is sandwiched between the paper feed tray 32 and the paper feed roller 331 and discharged from the paper feed tray 32 according to the rotation of the paper feed roller 331.

When the paper feed roller 331 rotates, the ASIC 107, for example, feeds the paper feed roller 331.
The pulses generated by a rotary encoder (not shown) that rotates with the counter are counted. ASI
C107 updates the detection speed and the detected movement amount stored in the memory of the ASIC 107 based on the pulse count value.

The paper feed controller that designates the target position and target speed of the ADF motor 35 periodically performs AS
The detection speed, the detected movement amount, etc. are read from the memory of the IC 107 or the like. The paper feed control unit 122 designates a new target position and target speed of the ADF motor 35 based on the read detection speed and detected movement amount.

In addition, the control command value generation unit 101c periodically performs new control so that a control deviation between the designated target position and the detected movement amount, a control deviation between the designated target speed and the detected speed, and the like are reduced. Generate a command value. The control command value generation unit 101c uses the generated new control command value to
The control command value stored in the memory of the SIC 107 is updated.

Thereby, after the execution of the paper feed sequence is started, the control command value supplied from the ASIC 107 to the motor driver 108 is periodically updated. The motor driver 108 increases or decreases the number of pulses output to the ADF motor 35, the pulse density, or the like according to the control command value. The rotation of the ADF motor 35 changes following the change of the control command value. Conveying roller group 33
This rotation changes following the target speed and target movement amount generated by the paper feed control unit 122 based on a predetermined paper feed sequence. The paper placed on the paper feed tray 32 is fed to the scanning position by the transport roller group 33 that rotates following the paper feed sequence.

When the leading edge of the paper transport direction is at the scanning position, the control command value becomes “0”
The ADF motor 35 etc. stops. The paper feed control unit 122 ends paper feed control according to a predetermined paper feed sequence.

When it is known that the paper feed control unit 122 has finished the paper feed control based on the detected speed of the ADF motor 35 stored in the memory of the ASIC 107 being “0”, for example, the scanner control unit 101a (sequence control) Next, the unit) selects the scan control unit 123 and instructs scanning control. The scan control unit 123 performs scanning control by a predetermined scanning sequence (for example, scanning based on the above-described drive table and determination table). At this time, in accordance with the scanning, the paper feed control at the time of scanning is executed by the paper feed control unit 124.

Next, the flow of the paper discharge sequence when the scanning is finished and the paper is discharged will be described with reference to FIGS. The paper discharge control unit 125 of the CPU 101 automatically executes paper discharge processing when scanning is completed. However, the paper discharge control unit 125 may calculate the amount of heat generated by the single sheet scanning before the paper discharge control is started, and may execute paper discharge control corresponding to the calculated heat generation amount.

Specifically, when the paper discharge is completed, as shown in FIG. 18, the CPU 101 first ends the time measurement from the paper feed start started in step S28 to the paper discharge completion (step S31).
. The paper discharge control unit 125 reads an elapsed time (time from the start of paper feed to the completion of paper discharge) measured by the timer 111 of the CPU 101.

Next, the paper discharge control unit 125 of the CPU 101 starts a process for updating the accumulated heat storage data due to heat generation (step S32). The calculation sequence of the accumulated heat storage data in step S32 is as follows.
This will be described with reference to FIG.

Specifically, the paper discharge control unit 125 first stores the accumulated heat storage data accumulated up to the present time in CP.
Read from the EEPROM of the memory 112 of U101 (step S41). Next, the single sheet calorific value table 15 stored in the memory 152 of the CPU 134 using the measured paper feed time.
6, that is, refer to the cut sheet calorific value table 116 (step S42). by this,
Get the estimated calorific value. The same one-sheet heating value table 156 may be stored in the memory 112 of the CPU 101. As shown in FIG. 9, the single sheet calorific value table 156 stores the rising temperature per sheet of the ADF motor 35 for each time period of the single sheet feeding time.
For example, if the time from paper feeding to paper ejection in this scanning is “36” (= 3.6 seconds), the CPU 101 determines that the ADF motor corresponds to the time zone 34 to 38 of the single sheet heat generation amount table 156. “53” (= 0.53 degrees) is read as the rising temperature per sheet of 35.

The CPU 101 determines whether or not the obtained value is “90”, that is, 0.9 degrees or more (step S43). If it is determined Yes in step S43, the estimated heat generation amount is set to “150” (= 1.5 degrees) (step S44). Here, the amount of heat generated above “90” is clipped to “90”.
This is because it is a high-resolution scan, and as described above, the ADF motor 35 stops, that is, scanning stops. The reason why the value is “150” is because various risks are taken into consideration. This value “150” may be “90” or another value such as “90”.

When it is determined No in step S43 and when step S44 is completed, the CPU 1
01 obtains the first scan coefficient shown in FIG. 10 and the second scan coefficient shown in FIG. 11 from the set scan resolution and reading area (step S45). In step S46, the latest accumulated heat storage data is obtained. In order to obtain the latest accumulated heat storage data, first, the first scan time coefficient shown in FIG. 10 and the second scan time coefficient shown in FIG. 11 are applied to the estimated heat generation amount obtained in step S42 or the like. The latest accumulated heat storage data is obtained by adding the heat generation addition amount which is a value obtained by the multiplication to the past accumulated heat storage data obtained in step S41. Thereafter, the latest accumulated heat storage data obtained is recorded in the memory 112 (EEPROM) of the CPU 101 (step S47). Thereby, the cumulative heat storage data update sequence is completed. The paper discharge control unit 125 of the CPU 101 that has executed the data update processing due to heat generation resets the elapsed time to be measured for scanning to the next single sheet (step S48).

Returning to FIG. 18, step S33 will be described. The CPU 101 that has added the accumulated heat storage amount in step S32 and updated the accumulated heat storage data 114 further executes a data update process by heat dissipation (step S33). In step S33, the paper discharge controller 125
Executes the heat dissipation update subroutine shown in FIG. That is, the paper discharge control unit 125 of the CPU 101 reads the accumulated heat storage data 114 stored in the memory 112 of the CPU 101 (step S51), and determines whether or not a predetermined subtraction calculation period has elapsed since the previous calculation time. (Step S52). When scanning is performed continuously from the next to the next, it is determined No in this step S52, and the process proceeds to step S54. When scanning is performed at an interval, there is a high probability of being determined as Yes in step S52, and the process proceeds to step S53.

If it is determined in step S52 that a predetermined subtraction calculation period has elapsed from the previous calculation time, the CPU 101 executes a heat dissipation calculation. The heat radiation calculation executes an expression “cumulative heat storage amount = read cumulative heat storage amount × heat radiation coefficient”. Here, the read cumulative heat storage amount is the cumulative heat storage amount of the cumulative heat storage data 114 read from the memory 112 of the CPU 101. The heat dissipation coefficient is a predetermined value smaller than 1, for example, 0.928 / min (= multiply 0.928 every 1 minute). By calculating this equation, a cumulative heat storage amount whose value is reduced by heat radiation can be obtained (step S53). Next, it is determined whether or not the accumulated heat storage amount obtained by the heat radiation calculation is larger than a predetermined heat storage amount threshold value (step S54). The predetermined heat storage amount threshold value is “4350” (= 43.50 ° C.) in this embodiment, but may be another threshold value.

When the CPU 101 determines that the accumulated heat storage amount is not greater than a predetermined heat storage amount threshold,
The CPU 101 generates a waiting time “0” (step S55), and updates the waiting time data 115 stored in the memory of the CPU 101 with the generated waiting time (step S57).
). The CPU 101 ends the data update process by heat dissipation.

When the accumulated heat storage data 114 held in the memory 112 of the CPU 101 is larger than a predetermined heat storage amount threshold, the paper discharge control unit 125, for example, “waiting time = constant × (cumulative heat storage amount−heat storage amount threshold)” as follows: Based on the above, the waiting time is calculated (step S56). Here, the constant is an integer value, and the waiting time is obtained in seconds. Note that the waiting time may be calculated at the start of each operation, considering the three operations from feeding to scanning position, scanning period, and discharging start to completion. In this case, the calculation formula for the waiting time is preferably the same, but may be changed.

The paper discharge control unit 125 that has calculated the waiting time updates the waiting time data 115 stored in the memory 112 of the CPU 101 with the calculated waiting time (step S57).

Thus, CPU1 which performed the data update process by heat dissipation (step S33 of FIG. 18)
The 01 paper discharge control unit 125 determines whether or not there is a next original P to be scanned (step S34). If there is a next original P, the CPU 101 further determines whether or not the waiting time is “0” (step S35).

For example, the scanning of the document P is completed in a short time, and the amount of heat generated by the current scanning read from the single sheet heat generation amount table 156 (= single sheet heat generation amount table 156) is determined by the CPU 10.
Even if it is added to the heat storage amount of the accumulated heat storage data 114 stored in the first memory 112, the waiting time is “0” if the value does not exceed the heat storage amount threshold. When there is a next scanning document P in this state, the CPU 101 determines that there is a next document P and the waiting time is “0”. Then, at the waiting time “0”, the paper feed control unit 122 executes the next paper feed process (step S36).

If the CPU 101 determines in step S34 that there is no next original P, the process ends. If the waiting time is not “0” in step S35, the CPU 101 pauses the ADF motor 35 during the waiting time, and then starts the paper feeding process (step S37).
.

<Effect of Embodiment>
When this embodiment is adopted, the accuracy of heat generation amount estimation of the ADF motor 35 is improved. Specifically, conventionally, the ADF motor 35 has a heat resistance limit of 130 ° C., and the predetermined heat storage threshold is set to about 45 ° C., so that the printer multifunction device 1 can be operated in a bad environment of about 50 ° C. In this case, when the temperature reaches about 95 ° C. (= estimated cumulative heat generation amount of about 45 ° C.), the ADF motor 35 is stopped. However, in reality, the ADF motor 35 was stopped at about 70 ° C. (in a bad environment of about 50 ° C.), which is about 25 ° C. lower. This is because the accuracy of heat generation estimation is poor. On the other hand, when the control for applying the correction coefficient shown in this specification is performed,
The accuracy is improved by about 25 ° C., and the actual stop temperature exceeds 90 ° C., and the ADF motor 35 reaches the temperature range exceeding the heat resistance limit temperature 130 ° C. minus 40 ° C. (= 90 ° C.). The drive range of the motor 35 can be expanded. As a result, the amount of work that can be processed within the unit time of the ADF device 30 increases. Specifically, 3-5 PPM (PPM: Page Per M
inutes), improving. Thus, AD closer to the limit of heat resistance
A motor driving device capable of driving the F motor 35 is obtained. Further, it is possible to obtain the document reading apparatus 10, the printer multifunction peripheral 1, and the medium reading control method for the document reading apparatus 10 that can reduce the pause time of the ADF motor 35 as much as possible and improve the scanning performance.

In the case of the conventional structure in which the gap S is not provided, when the motor temperature is close to 100 ° C., the surrounding temperature is increased due to heat storage, and the motor holder 40 and the bearing wall portion 57 are distorted or deformed. On the other hand, when the structure is provided with the gap S as in this embodiment,
Even if the ADF motor 35 and the PF motor 65 reach around 100 ° C., the motor holder 40
In addition, the bearing wall 57 is not distorted or deformed. For this reason, a predetermined heat storage amount threshold value can be 50 degreeC or more. In this embodiment, the heat storage threshold is set to 4 in consideration of safety.
Although it is about 3 ° C., it can theoretically be raised to about 70 ° C. That is, A
The driving range can be expanded to about 120 ° C., which is a value close to 130 ° C., which is the heat resistant limit temperature of the DF motor 35 and the PF motor 65. Thus, with the structure in which the gap S is provided, the actual upper limit temperature is 95 ° C. (= 120 ° C.) even when the heating value is controlled with no correction coefficient applied.
The driving range can be expanded.

Further, according to the document reading device 10 having the above-described configuration, when it is determined that the reading of the document P is interrupted, the ADF motor 35 is started in the pull-in area and is pulled out after a predetermined stabilization step. Driven in the area. Thereby, the ADF motor 35 can be reliably driven without stepping out at the time of startup. In addition, since the ADF motor 35 is driven in the pull-out region after the elapse of a predetermined stabilization step, the current value of the ADF motor 35 can be reduced to suppress heat generation.

In the present embodiment, the ADF motor 35 is driven based on the drive table. Therefore, the ADF motor 35 can be easily driven in the pull-in area or the pull-out area. Furthermore, in the present embodiment, for example, 96 steps,
The ADF motor 35 is driven in the pull-out region after the number of steps of a predetermined stabilization step has elapsed and the vibration generated at the time of start-up is attenuated. For this reason, the ADF motor 35 can be driven without being stepped out.

In the present embodiment, the ADF motor 35 is driven at the same frequency in both the pull-in region and the pull-out region. Therefore, in any region, A
The driving speed of the DF motor 35 can be made constant and can be driven at a constant speed. In addition, while driving at a constant speed, driving in the pull-out region can reduce current, and heat generation in the ADF motor 35 can be suppressed.

The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications and changes can be made without departing from the scope of the invention. is there. For example, the ADF device 30 of the multifunction printer 1 has been described. However, the present invention can also be applied to a paper feed of a single scanner device or a motor drive device of an optical system. The present invention can also be applied to driving the printer multifunction machine 1 and the PF motor 65 of the printer apparatus.

Note that the transport from the paper feed to the scan position, the scanning period, and the three operations from the start to the end of the paper discharge are considered separately. At the start of each operation, the amount of heat generated by the ADF motor 35 is calculated using a correction coefficient. You may make it calculate with a multiplied value and to calculate waiting time etc. In this case, the correction table for correcting the heat generation amount, the correction calculation formula, and the calculation formula for the waiting time are preferably the same, but may be changed. In the above-described embodiment, the paper feed control unit 122 and the paper discharge control unit 125 perform each process. However, all or some of the processes are installed in the CPU 101 or the ASIC 107. You may make it carry out with the software which is. In that case, the inside of the CPU 101 is the paper feed control unit 1.
22 and the paper discharge control unit 125 are not divided into each part.

In the above-described embodiment, the correction coefficient is applied and clipping (upper limit setting) is performed on the estimated heat generation amount. However, only one of them may be performed. Further, the correction coefficient table 117 includes two of the first scanning coefficient and the second scanning coefficient, but only one of them, or in addition to the two,
Other correction coefficients may be added. Also, the single sheet calorific value tables 116, 15
6 and each of the values in the correction coefficient table 117 are examples, and the values can be changed according to specifications, usage, and the like. In the above-described embodiment, the single sheet calorific value table 1
16 and the single sheet calorific value table 156 are the same, and the single sheet calorific value table 116 uses the single sheet calorific value table 156, but it is held separately or the table is also different. Also good.

Further, in the above-described embodiment, the waiting time is calculated based on the time for sending a single sheet.
The F motor 35 and the PF motor 65 are small stepping motors. The stepping motor can easily control the drive current according to the scanning resolution and the like.
In addition, for example, a DC motor with a current control circuit, a small AC motor, or the like may be used as the ADF motor 35 or the PF motor 65 in which the waiting time is calculated based on the sheet feeding time.

1 is a diagram illustrating a schematic configuration of a multifunction printer including a motor driving device according to an embodiment of the present invention. It is a figure which shows the state (except a screw | thread) in which the ADF motor used as the drive motor in the ADF apparatus of the multifunction printer shown in FIG. 1 is attached to the motor holder. It is a top view of the motor holder shown in FIG. FIG. 3 is a plan view of the ADF motor shown in FIG. 2. It is a principal part side view which shows the state in which the ADF motor shown in FIG. 4 was attached to the motor holder shown in FIG. FIG. 2 is a plan view of a base portion of a printer function unit of the multifunction printer of FIG. 1. FIG. 2 is a block diagram illustrating a configuration of a control unit of the document reading device of the multifunction printer of FIG. 1. FIG. 2 is a block diagram illustrating a configuration of a control system of a printer function unit of the multifunction printer of FIG. 1. It is explanatory drawing which shows the data structure of the single sheet | seat calorific value table in FIG. 7, and also the single sheet | seat calorific value table in FIG. It is a figure which shows the table which shows the coefficient at the time of the 1st scan of the correction coefficient table in FIG. It is a figure which shows the table which shows the 2nd coefficient at the time of a correction coefficient table in FIG. It is a figure which shows the example which simplified the drive table of the ADF motor used for the printer compound machine of FIG. FIG. 2 is a diagram illustrating an example of a driving table of an ADF motor used in the multifunction printer of FIG. 1 and an actual current value. It is a figure which shows the judgment table at the time of the drive of the ADF motor used for the printer multifunction device of FIG. It is a figure which shows the processing flow in the drive of the ADF motor used for the printer multifunctional device of FIG. FIG. 2 is a diagram illustrating a pull-in torque and a pull-out torque of an ADF motor used in the printer multifunction device of FIG. 1. It is a flowchart which shows the flow of the paper feed control of the paper feed control part in FIG. It is a flowchart which shows the flow of the paper discharge control of the paper discharge control part in FIG. It is a flowchart which shows the flow of accumulation heat storage data calculation of the paper discharge control part in FIG. It is a flowchart which shows the flow of the thermal radiation update process of the paper discharge control part in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printer multifunction device, 10 Document reader, 20 Scanner apparatus, 30 ADF apparatus (motor drive device, automatic paper feeding means), 35 ADF motor (drive motor, conveyance motor), 35b
Bottom, 35c Flange for mounting, 35e Enlarged flange, 40 Motor holder, 41 Case bottom (bottom), 41c Mounting, 42 Upper wall (wall), 42
a notch space part, 43 lower wall part (wall part), 43a notch space part (wall part), 65
PF motor, 100 control unit (determination unit, motor control unit), 101 CPU (determination unit, subtraction unit), 114 accumulated heat storage data, 115 waiting time data, 116 single sheet heating value table, 117 correction coefficient table, 122 paper feed Control unit (drive control unit, supply control unit), 125 paper discharge control unit (heat generation amount acquisition unit, waiting time determination unit, discharge control unit), S
Gap

Claims (8)

A drive motor attached to the motor holder in a state where a bottom surface is floated from a resin motor holder to be attached and a gap is formed,
Based on the drive time of the drive motor, a heat generation amount obtaining unit that estimates a heat generation amount of the drive motor and obtains a heat addition amount of the drive motor;
A waiting time determining means for determining a waiting time for delaying driving of the drive motor based on the accumulated heat storage amount of the drive motor calculated from the acquired heat generation addition amount;
Have
A motor drive device capable of driving the drive motor to a temperature range exceeding a value obtained by subtracting a predetermined temperature from a heat resistant limit temperature of the drive motor. A drive motor attached to the motor holder in a state where a bottom surface is floated from a resin motor holder to be attached and a gap is formed,
Based on the drive time of the drive motor, a heat generation amount obtaining unit that estimates a heat generation amount of the drive motor and obtains a heat addition amount of the drive motor;
A waiting time determining means for determining a waiting time for delaying driving of the drive motor based on the accumulated heat storage amount of the drive motor calculated from the acquired heat generation addition amount;
Have
Wall portions extending in the horizontal direction are provided at the lower and upper portions of the motor holder, part of the wall portions located at the lower and upper portions of the drive motor are cut out, and the amount of air passing through the gap is increased. A motor drive device. A drive motor attached to the motor holder in a state where a bottom surface is floated from a resin motor holder to be attached and a gap is formed,
Based on the drive time of the drive motor, a heat generation amount obtaining unit that estimates a heat generation amount of the drive motor and obtains a heat addition amount of the drive motor;
A waiting time determining means for determining a waiting time for delaying driving of the drive motor based on the accumulated heat storage amount of the drive motor calculated from the acquired heat generation addition amount;
Have
In addition to two mounting flanges that extend on both sides of the bottom of the drive motor,
A motor driving device characterized in that an enlarged flange portion for connecting the mounting flange portion is provided so as to surround the bottom surface, and a heat radiation amount is increased. Two flange portions for attachment extending on both sides are provided on the bottom surface of the drive motor, and the attachment flange portion is attached to two attachment portions which are slightly protruded from the bottom portion of the motor holder and provided with a space therebetween. 4. The motor driving apparatus according to claim 1, 2, or 3. The drive motor is driven with a different current value depending on a difference in reading a document, and the heat generation addition amount is obtained by multiplying the estimated heat generation amount by a coefficient corresponding to the difference in reading the document, and the waiting time 4. The motor driving apparatus according to claim 1, wherein a new driving by the driving motor is started after the operation. The calorific value acquisition means obtains a calorific value of the drive motor by multiplying a value obtained by multiplying a coefficient corresponding to a difference in resolution for reading a document by a coefficient of a size of a portion where the document is read. 6. The motor drive device according to claim 5, wherein 4. The motor according to claim 1, wherein the calorific value acquisition means sets the predetermined value as the estimated calorific value when the estimated calorific value is equal to or greater than a predetermined value or exceeds a predetermined value. Drive device. The stepping motor as the driving motor, and an automatic paper feeding means that is driven by the stepping motor and takes out a document from a document placement unit that stores a plurality of documents.
Determining means for determining whether or not an interruption occurs during an operation of reading the original document supplied by the automatic paper feeding means with a reading unit;
Motor control means for driving the stepping motor in the pull-in area at startup and driving the stepping motor in the pull-out area after elapse of a predetermined stabilization step when it is determined that interruption occurs in the determination means;
The motor driving device according to claim 1, wherein the motor driving device is provided.

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