JP2020021994A - Carriage loading device and carriage drive control method - Google Patents

Abstract

To suppress the power consumption of a carriage.SOLUTION: A carriage loading device includes: a carriage freely movably supported by a device body; power storage means for supplying drive power to the carriage; charging means for charging the power storage means; and control means which moves the carriage from a start position PS to a target position PT in a first sequence, and moves the carriage from the target position PT to an end point position PE in a second sequence in which average power consumption per travel distance is smaller than that in the first sequence. When the power storage amount of the power storage means falls below a predetermined power storage amount while the carriage is moving in the first sequence, the control means halts the carriage, and the charging means charges the power storage means to the predetermined power storage amount or higher. When a gap between the stop position and the target position PT comes to a predetermined value or smaller, the control means moves the carriage from the stop position to the end point position PE in the second sequence, after the completion of the charging.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a carriage mounting device such as an image reading device and an image forming device and a drive control method of a carriage.

  Various devices equipped with a carriage for reading an image, printing an image, and the like (hereinafter, referred to as a carriage mounting device) are known. As an example of the carriage mounting device, there is, for example, a flatbed type image reading device (hereinafter, referred to as a scanner) mounted on various products including a copying machine. The scanner reads a document placed on the contact glass by moving a carriage having a reading unit. The moving speed of the carriage differs in the reading direction (scanning direction), which is the outward path, depending on the reading mode such as resolution. On the other hand, in the return direction (return direction), which is the return path, the carriage returns to the return direction at a speed higher than the speed in the reading direction immediately after the end of reading (Patent Document 1). Thus, the carriage can be quickly returned to the original position.

  Generally, in a scanner, a carriage is reciprocated using forward and reverse rotations of a motor. For this reason, when switching between driving and stopping of the motor is frequently performed, the fluctuation of the current consumption is large, and the power supply device tends to be large. In order to address this problem, a scanner incorporating a secondary battery is sometimes used. When the current consumption is small, the secondary battery is charged. When the current consumption is large, the charge charged in the secondary battery is discharged and used as the driving power for the carriage. By using such a secondary battery, fluctuations in current consumption can be absorbed, and an increase in the size of the power supply device can be suppressed.

JP-A-11-150975

However, when the driving of the motor is repeatedly stopped frequently, the charging of the secondary battery may not be in time, and it may be necessary to temporarily stop the carriage while driving the carriage to charge the secondary battery. In order to suppress the occurrence of such a situation, it is desirable to reduce the power consumption of the carriage.
An object of the present invention is to provide a carriage mounting device capable of suppressing power consumption of a carriage.

  The carriage mounting apparatus of the present invention includes a carriage movably supported by the apparatus main body, a power storage unit for supplying driving power to the carriage, a charging unit for charging the power storage unit, and a first unit for moving the carriage from a start position to a target position. And control means for moving from the target position to the end point position in the second sequence having a smaller average power consumption per moving distance than the first sequence in the second sequence. When the amount of power stored in the power storage means falls below the predetermined power storage amount during movement in the sequence, the control means stops the carriage, the charging means charges the power storage means to the predetermined power storage amount or more, and the interval between the stop position and the target position. Is less than or equal to the predetermined value, the control means moves the carriage from the stop position to the end point in the second sequence after charging is completed. To.

  ADVANTAGE OF THE INVENTION According to this invention, the carriage mounting apparatus which can suppress the power consumption of a carriage can be provided.

FIG. 1 is a perspective view of an image reading device according to a first embodiment of the present invention. FIG. 2 is a plan view of the image reading device shown in FIG. 1. FIG. 4 is a perspective view of a carriage driving mechanism. FIG. 2 is a block diagram illustrating a control configuration of a multifunction peripheral including a scanner. 6 is a flowchart illustrating a flow of a carriage return operation and an abutment operation. FIG. 3 is a schematic diagram illustrating a relationship between a speed and a position of a carriage. FIG. 7 is a diagram showing a modification of FIG. 6. 9 is a flowchart of a return operation of the carriage according to the second embodiment. FIG. 10 is a schematic diagram illustrating a relationship between a speed and a position of a carriage according to a second embodiment. FIG. 9 is a schematic configuration diagram of an image forming apparatus according to a third embodiment of the present invention.

Hereinafter, a carriage mounting device and a carriage drive control method of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a perspective view of an image reading apparatus 1 (hereinafter, also referred to as a scanner 1) as an example of a carriage mounting apparatus of the present invention, with a document cover 21 opened. FIG. 2 is a plan view of the image reading device 1 shown in FIG. FIG. 3 is a perspective view showing a driving mechanism of the carriage 4, and illustration of the carriage 4 is omitted. On the upper surface of the apparatus main body 11, a transparent table 2 for mounting a document is attached. The table 2 is preferably made of glass, but may be made of a transparent material other than glass. The original is set so that the read image surface contacts the table 2. A document cover 21 for pressing a document placed on the upper surface of the base 2 is attached to the apparatus main body 11 so as to be openable and closable. An original pressing sheet 22 made of a sheet material and a sponge is attached to a pressing surface of the original cover 21.

  A reading sensor 3 that is movable in the Y direction along the lower surface of the table 2 is arranged inside the apparatus main body 11. The reading sensor 3 is a reading unit that scans a document placed on the table 2 through the table 2 to read the original. The reading sensor 3 is a contact image sensor (CIS) having a long axis in the X direction, and is similarly mounted on a carriage 4 having a long axis in the X direction. The reading sensor 3 has a light emitting element (not shown) composed of LEDs of three colors RGB and a light receiving element (not shown) composed of a CCD for receiving light reflected on the document surface. The rack member 6 integrally formed with the guide rail 31 is fixed to the apparatus main body 11. The rack member 6 is formed with rack teeth 41 over substantially the entire length thereof. The slider 5 and the support frame 42 are fixed to the lower surface of the carriage 4 (the surface opposite to the base 2). The slider 5 is slidably engaged with the guide rail 31. A DC motor 303 for driving the carriage 4 is mounted on the support frame 42. The pinion gear 8 meshing with the rack teeth 41 is rotatably supported by the support frame 42. The rotation of the motor 303 is transmitted from the motor gear 44 to the worm gear 17 via the idler gear 16, and further transmitted to the pinion gear 8 integrally formed with the worm wheel 45 via the worm gear 17. When the pinion gear 8 rotates while meshing with the rack teeth 41 of the rack member 6, a propulsive force acts on the pinion gear 8. The carriage 4 is guided in the Y direction by sliding of the slider 5 with the guide rail 31, and moves in the Y direction by this propulsive force. Thus, the carriage 4 is supported by the apparatus main body 11 so as to be movable in the Y direction. The reading sensor 3 reads an image on the lower surface of the document placed on the table 2 while moving along the lower surface of the table 2 together with the carriage 4.

  FIG. 4 is a block diagram illustrating a control configuration of the multifunction peripheral including the scanner 1. The CPU 101 controls the entire MFP. Therefore, the CPU 101 is also a control unit of a driving system such as the carriage 4. The RAM 102 provides a work area for the CPU 101 and a temporary storage area (storage unit) for data. The ROM 104 stores a firmware program for driving the image reading device 1 and a boot program for controlling the firmware program. The analog processing unit 105 amplifies and samples the analog image signal output from the light receiving element 103, performs A / D conversion, and outputs digital image data. The read image processing unit 107 performs image processing such as edge enhancement and color conversion on the digital image data output from the analog processing unit 105. The light receiving element 103, the analog processing unit 105, and the image processing unit 107 realize a scanner function for reading a document. The operation control unit 109 is a user interface having a key input unit and a display unit, and accepts user instructions such as mode selection such as a copy mode and a scan mode, and operation for starting operation. The external interface 113 transmits image data read at the time of scanning to a connected PC (personal computer) 100 and receives control data from the PC 100.

  The reading sensor 3 and the carriage 4 are moved by the CPU 101 driving the DC motor 303 via the motor driver 302. An encoder sensor (not shown) is attached to the DC motor 303, and the encoder sensor can obtain speed information by reading a code wheel (not shown). Based on the speed information, the CPU 101 performs feedback control on the movement of the reading sensor 3 and the carriage 4. The feedback control is executed by a control program stored in the ROM 104.

  Power is supplied to the apparatus main body 11 from an external power supply. The apparatus main body 11 has a power storage unit 111 that can be charged by an external power supply. The power storage unit 111 supplies a part or all of the driving power of the carriage 4 to the carriage 4. The reason for providing the power storage means 111 is as follows. In the power supply unit that supplies driving power to the carriage 4, the allowable current value is determined based on the maximum current value. For this reason, in the scanner 1, the electronic components constituting the power supply unit tend to be large in size as compared with electronic devices having the same average power consumption, and accordingly, it is difficult to reduce the size and the price. May be. In the present embodiment, the power storage unit 111 is charged when the current consumption of the motor 303 or the like is small, and the charge stored in the power storage unit 111 is discharged and used when the current consumption increases. As a result, fluctuations in current consumption can be absorbed. In other words, when the current consumption increases, the shortage of the power supplied from the external power supply can be compensated by using the power supplied from the external power supply and the power stored in the power storage unit 111 together. .

  The method of supplying power from the external power supply is not particularly limited, but in the present embodiment, power is supplied from the PC 100 via the external interface 113. The PC 100 is preferably a PC having a USB terminal that supports USB 2.0, USB 3.0, Battery Charging Specification, USB Power Delivery, and the like. Alternatively, power may be supplied from a charger that supports USB Power Delivery, an AC adapter that does not have a USB interface, or the like. The supplied electric power is converted into a voltage, a part of the electric power is used as a power supply for a system load of the apparatus main body 11, and the remaining electric power is used for charging the power storage unit 111. The charging of the power storage unit 111 is performed by a charging control unit (charging unit) 110. The power storage means 111 is a secondary battery, and is preferably capable of quick charging / discharging and having little deterioration due to repeated charging / discharging. An example of a preferable power storage unit 111 is an electric double layer capacitor. The charging current is determined in consideration of the charging capability of the charging control unit 110, the maximum charging current of the power storage unit 111, and the like within a range not exceeding the current that can be supplied by the external interface 113. The charging control unit 110 is also connected to the CPU 101 and provides information for performing charging control of the power storage unit 111 to the CPU 101.

  The charged amount of the power storage unit 111 is monitored by the charged amount detection unit of the charging control unit 110. That is, the charging control unit 110 functions not only as a charging unit of the power storage unit 111 but also as a monitoring unit that monitors a charging state of the power storage unit 111. When the power storage unit 111 is charged up to the predetermined power storage amount, the charging of the power storage unit 111 is stopped by the charge control unit 110. The electric power charged in the power storage unit 111 is supplied to a drive system such as the carriage 4 via the charge control unit 110. When the amount of power stored in power storage means 111 falls below a predetermined amount of power stored by the operation of the drive system, charging is continuously performed by charging control unit 110. By this operation, when the power consumption of the driving system temporarily increases, it is necessary to use the power stored in the power storage unit 111 and the power supplied from the PC 100 via the external interface 113 together. Power can be secured.

  Next, the return operation and the butting operation of the carriage 4 will be described. FIG. 5 is a flowchart illustrating the flow of the carriage return operation and the butting operation. FIGS. 6A and 6B are schematic diagrams illustrating the relationship between the moving speed of the carriage 4 and the position of the carriage 4. When the reading operation of the scanner 1, that is, the reading of the document surface, is completed, the carriage 4 performs a return operation to return to the home position or a home position and a butting operation for returning the carriage 4 to the original position in order to prepare for the next reading operation. The return operation and the striking operation are performed continuously, but the carriage 4 is temporarily stopped before the striking operation is performed. In the following description, the start point of the return operation, that is, the position on the opposite side of the origin position of the scanner 1 in the Y direction is referred to as a start position PS. The position where the carriage 4 temporarily stops for the abutting operation is called a target position PT. That is, the return operation is performed in a section from the start position PS to the target position PT. The target position PT substantially coincides with the origin position. The carriage 4 starts the abutting operation from the target position PT, and stops when it abuts a predetermined side wall of the apparatus main body 11. This position is called an end point position PE. That is, the butting operation is performed in a section from the target position PT to the end point position PE. The pattern of acceleration / deceleration of the carriage 4 from the start position PS to the target position PT is called a first sequence. The pattern of acceleration / deceleration of the carriage 4 from the target position PT to the end point PE is called a second sequence. The first sequence has a first acceleration stage ST11, a first constant speed stage ST12, and a first deceleration stage ST13. In the first acceleration stage ST11, the CPU 101 accelerates the carriage 4 from the stopped state to a predetermined speed (first speed V1). In the first constant speed stage ST12, the CPU 101 moves the carriage 4 at a first speed V1 at a constant speed. In the first deceleration stage ST13, the CPU 101 decelerates the carriage 4 from a predetermined speed (first speed V1) and stops it. The second sequence has a second acceleration stage ST21 and a second constant speed stage ST22. In the second acceleration stage ST21, the CPU 101 accelerates the carriage 4 from the stop state to a predetermined speed (second speed V2). In the second constant speed stage ST22, the CPU 101 moves the carriage 4 at a constant speed at the second speed V2. The second speed V2 is lower than the first speed V1. The first sequence has a higher average moving speed to return the carriage 4 to the origin position as quickly as possible, and the second sequence has a lower average moving speed than the first sequence in order to secure the accuracy of the abutting operation. In the first acceleration stage ST11, the first deceleration stage ST13, and the second acceleration stage ST21, acceleration and deceleration are performed at a constant acceleration, but the acceleration may change with time. Further, the first constant speed stage ST12 and the second constant speed stage ST22 do not need to be completely constant speed, and the speed may slightly vary.

  First, the CPU 101 moves the carriage 4 from the start position PS to the target position PT in a first sequence (Step S101). As described above, the charged amount (remaining charge amount) of the power storage unit 111 is constantly monitored (step S102). When the charged amount of the power storage unit 111 is equal to or larger than the predetermined charged amount, the carriage 4 stops at the target position PT as shown in FIG. Thereafter, the CPU 101 moves the carriage 4 from the target position PT to the end position PE in the second sequence (Step S105). Specifically, the CPU 101 accelerates the carriage 4 from the stop state to the second speed V2, and then moves the carriage 4 at a constant speed at the second speed V2. The carriage 4 collides with the side wall of the apparatus main body 11, and the speed becomes zero. The CPU 101 detects that the carriage 4 has collided with the side wall of the apparatus main body 11 from the speed information acquired by the encoder sensor of the DC motor 303. Thereafter, the CPU 101 moves the carriage 4 in the reverse direction (direction toward the start position PS) by a predetermined amount and stops the carriage 4 (step S106). The predetermined amount is stored in the ROM 104 in advance. By the above operation, the origin position for the next document reading is set. As described above, since the origin position is set by the abutting operation and the subsequent movement of the carriage 4 by a predetermined amount, a sensor for detecting the position of the carriage 4 is not required, which is effective for reducing the cost of the scanner 1.

  On the other hand, when the monitoring unit detects that the charged amount of the power storage unit 111 is smaller than the predetermined charged amount while the carriage 4 is moving in the first sequence, the CPU 101 immediately moves the carriage 4 as shown in FIG. It is stopped (step S103). In this example, while the carriage 4 is moving at the constant speed at the first speed V1, it is detected that the power storage amount of the power storage unit 111 falls below the predetermined power storage amount when reaching the position PX. Therefore, the CPU 101 immediately decelerates the carriage 4. The carriage 4 temporarily stops at the stop position PY. In the present embodiment, the stop position PY may be closer to the start position PS than the target position PT, or may be closer to the target position PT than the start position PS. The acceleration at the time of deceleration is the same as the acceleration at the time of deceleration in the first sequence, but may be different. When it is detected that the charged amount of the power storage unit 111 is smaller than the predetermined charged amount while the carriage 4 is accelerating (that is, in the first acceleration stage ST11), the acceleration of the carriage 4 is immediately terminated and decelerated. If it is detected that the amount of power stored in the power storage means 111 is smaller than the predetermined amount of power stored during the deceleration of the carriage 4 (that is, in the first deceleration stage ST13), the deceleration is continued. Therefore, in this case, the carriage 4 stops at the target position PT. That is, if it is detected before the carriage 4 stops at the stop position PY (during the movement in the first sequence) that the amount of power stored in the power storage means 111 falls below the predetermined amount of power storage, the carriage 4 moves to the start position PS and the target position. It stops between the position PT and the target position PT.

  When the carriage 4 stops at the stop position PY, the power storage unit 111 is charged to a predetermined charge amount or more by the charge control unit 110 (step S104). The carriage 4 remains stopped until the charging of the power storage unit 111 is completed. After the charging of the power storage unit 111 is completed, the CPU 101 moves the carriage 4 from the stop position PY to the end position PE in the second sequence (pattern 1). The acceleration during acceleration can be the same as the acceleration in the second sequence in FIG. 6A, and the speed during constant speed movement can be the same as the speed in the second sequence in FIG. 6A. it can.

  In FIG. 6B, a pattern in which the carriage 4 stops at the stop position PY and moves to the target position PT in the first sequence after the power storage unit 111 is charged is shown by a broken line (pattern 2). . In pattern 2, acceleration / deceleration in the first sequence is performed a total of four times, acceleration in the second sequence is performed once, and acceleration / deceleration is performed five times in total. On the other hand, in pattern 1, acceleration / deceleration in the first sequence is performed twice in total, and acceleration in the second sequence is performed once, and acceleration / deceleration is performed three times in total. In pattern 1, since the movement of the carriage 4 from the stop position PY to the target position PT is performed not by the return operation but by the abutment operation, the number of times of acceleration / deceleration is reduced by two times. In general, when the number of times of acceleration / deceleration is large, the power consumption of the motor increases, and this tendency is particularly strong in DC motors. That is, by moving the carriage 4 in the section from the stop position PY to the target position PT by the return operation, the power consumption increases, the charging frequency of the power storage unit 111 increases, and the smooth operation of the scanner 1 is hindered. Become. Further, moving the carriage 4 at high speed also leads to an increase in power consumption. In pattern 2, two high-speed movements are required, but in pattern 1, one high-speed movement may be performed, so that power consumption is further reduced. From another perspective, the second sequence is a sequence that consumes less average power per moving distance than the first sequence. In other words, when the power storage amount of the power storage unit 111 falls below the predetermined power storage amount during the execution of the first sequence, the pattern 1 uses the carriage 4 of the remaining section in the second sequence instead of repeating the first sequence. It is intended to move and reduce power consumption. In particular, when the stop position PY is relatively close to the target position PT, there is no significant difference in the required time whether the movement of the carriage 4 to the target position PT is performed in the first sequence or the second sequence. Therefore, the pattern 1 can achieve both suppression of the power consumption of the scanner 1 and suppression of the delay of the return operation.

  In the pattern 1, the carriage 4 temporarily stops at the target position PT, but the present invention can be applied to a reading device configured to switch the moving speed without stopping at the target position PT, and similar effects can be obtained. As shown in FIG. 7A, the first sequence has a first acceleration stage ST11, a first constant speed stage ST12, and a first deceleration stage ST13A. In a first acceleration stage ST11, the carriage 4 is accelerated from a stopped state to a predetermined speed (first speed V1). In the first constant speed stage ST12, the CPU 101 moves the carriage 4 at a first speed V1 at a constant speed. In the first deceleration stage ST13A, the CPU 101 decelerates the carriage 4 from the first speed V1 to the second speed V2. The second sequence has a second constant speed stage ST22A. In the second constant speed stage ST22A, the CPU 101 moves the carriage 4 at a constant speed at the second speed V2. That is, the sequence shown in FIG. 7 is different from the sequence shown in FIG. 6 in that the first deceleration stage ST13 and the second acceleration stage ST21 are omitted. Even in such a reading apparatus, as shown in FIG. 7B, when it is detected at the position PX that the charged amount of the electricity storage unit 111 is smaller than the predetermined charged amount, the CPU 101 immediately decelerates the carriage 4. The carriage 4 temporarily stops at the stop position PY. Thereafter, the power storage unit 111 is filled up to a predetermined power storage amount or more. When charging is completed, the CPU 101 accelerates the carriage 4 to the second speed V2 and moves the carriage 4 at a constant speed at the second speed V2. Since the carriage 4 stops, the second sequence has an additional acceleration step to accelerate the carriage 4 to the second speed V2, but the second sequence is still more average than the first sequence per moving distance. Power consumption is low.

(Second embodiment)
In the present embodiment, the sequence selected thereafter changes according to the interval between the target position PT and the stop position PY. Except for this point, the present embodiment is the same as the first embodiment. FIG. 8 is a flowchart illustrating the flow of the return operation of the carriage 4, and FIGS. 9A and 9B are schematic diagrams illustrating the relationship between the moving speed of the carriage 4 and the position of the carriage 4.
As in the first embodiment, the CPU 101 moves the carriage 4 from the start position PS to the target position PT in the first sequence (Step S201). The amount of power stored in the power storage unit 111 is constantly monitored (step S202). If the amount of power stored in the power storage unit 111 is equal to or more than the predetermined amount of power storage, the CPU 101 moves the carriage 4 from the stop position PY to the end point position PE in the second sequence, and performs an abutting operation (step S206). Thereafter, the CPU 101 moves the carriage 4 by a predetermined amount in the reverse direction toward the start position PS (Step S207). When the monitoring unit detects that the charged amount of the power storage unit 111 is lower than the predetermined charged amount while the carriage 4 is moving in the first sequence, the CPU 101 stops the carriage 4 (step S203). Then, the electric storage means 111 is charged to a predetermined value or more (step S204). Next, the CPU 101 selects one of the following steps according to the interval between the target position PT and the stop position PY.

  First, as shown in FIG. 9A, when the interval between the target position PT and the stop position PY is equal to or less than a predetermined value, the CPU 101 moves the carriage 4 from the stop position PY to the end point position PE. Move in sequence. This process is the same as in the first embodiment. The predetermined value can be set as appropriate, but is preferably the moving distance of the carriage 4 required for the acceleration stage and the deceleration stage in the first sequence. The broken line in FIG. 9A indicates a pattern in which the carriage 4 is moved from the stop position PY to the target position PT in a sequence of only acceleration and deceleration. The carriage 4 decelerates before reaching the first speed V1, and stops at the target position PT. Thereafter, the carriage 4 performs acceleration and deceleration a total of five times in order to perform the butting operation in the second sequence. Even if acceleration / deceleration is repeated in this manner, the effect of reducing the return time is small because the interval between the target position PT and the stop position PY is equal to or less than a predetermined value. On the other hand, in this embodiment, since the carriage 4 is moved from the stop position PY to the end point PE in the second sequence, the carriage 4 performs acceleration and deceleration three times in total. Therefore, the number of times of acceleration / deceleration is reduced by two times, and it is possible to achieve both suppression of the power consumption of the scanner 1 and suppression of the delay of the return operation.

Next, as shown in FIG. 9B, when the interval between the target position PT and the stop position PY exceeds a predetermined value, the CPU 101 moves the carriage 4 from the stop position PY to the target position PT in the first sequence. Move. This pattern is the same as the pattern 2 of the first embodiment. Since the predetermined value is the moving distance of the carriage 4 required for the acceleration stage and the deceleration stage in the first sequence, the movement from the stop position PY to the target position PT includes an acceleration stage, a constant speed stage, and a deceleration stage. In this case, when the carriage 4 is moved from the stop position PY to the end point PE in the second sequence, it takes a long time to move the carriage 4. Although acceleration / deceleration is performed five times in total, this is disadvantageous from the viewpoint of power consumption as described above. However, since the remaining distance to the target position PT is long, the effect of reducing the moving time of the carriage 4 is great. As described above, in the present embodiment, since it is determined whether to repeat the first sequence or shift to the second sequence according to the interval between the target position PT and the stop position PY, the power consumption of the scanner 1 is suppressed. And the suppression of the delay of the return operation. Further, as can be understood from the first embodiment and the second embodiment, when the interval between the target position PT and the stop position PY exceeds a predetermined value, both the pattern 1 and the pattern 2 in FIG. 6 are selected. You can do it. That is, pattern 1 is a pattern that emphasizes suppression of power consumption, and pattern 2 is a pattern that emphasizes reduction of return time.
Note that the present embodiment can also be applied to a reading device configured to switch the moving speed without stopping at the target position PT, and the same effect can be obtained.

(Third embodiment)
In the above-described embodiment, the method of switching the sequence when the carriage 4 shifts from the return operation to the striking operation is described using the scanner 1 as an example. However, the carriage mounting device of the present invention is not limited to the scanner 1. . In the present embodiment, an example of an image forming apparatus such as an ink jet printer will be described. FIG. 10 is a schematic diagram illustrating a schematic configuration of the image forming apparatus 51. FIG. 10A is a conceptual diagram of the image forming apparatus 51 viewed from a direction orthogonal to the width direction of the recording medium S. FIG. 10B is a conceptual diagram of the image forming apparatus 51 viewed from a direction orthogonal to the transport direction of the recording medium S. The image forming apparatus 51 includes a feeding unit 52 that feeds the recording medium S, and a recording unit 54 that is mounted on the carriage 53 and records an image on the fed recording medium S. The image forming apparatus 51 further includes a first driving unit 55 that moves the carriage 53 between the recording area A1 and the outside of the recording area A2, and a second driving unit 56 that drives the feeding unit 52. ing. The image forming apparatus 51 further includes a driving force switching unit 57 that switches between transmission and non-transmission of the driving force to the feeding unit 52 in accordance with the position of the carriage 53 in the recording area A2. The driving force switching means 57 is a trigger mechanism that contacts the carriage 53 or separates from the carriage 53 according to the position of the carriage 53. The trigger mechanism changes its shape or posture when it comes into contact with the carriage 53, and mechanically switches between transmission and non-transmission of the driving force from the second driving means 56 to the feeding unit 52.

  In the present embodiment, the first sequence is a return operation for returning the carriage 53 to the standby position for the next feeding operation, and the second sequence is to move the carriage 53 to a position where the driving force is transmitted to the feeding unit 52. This is a trigger operation. The trigger operation is an operation that places importance on the position accuracy as in the case of the butting operation, and thus is slower than the return operation. Therefore, when it is detected that the charged amount of the power storage unit 111 is smaller than the predetermined charged amount, whether the subsequent movement of the carriage 53 is performed by the return operation or the trigger operation can be considered in the same manner as in the above-described embodiment. it can. Therefore, also in the present embodiment, it is possible to suppress power consumption while securing the accuracy of the trigger operation.

1 scanner (carriage mounted device)
4, 53 Carriage 51 Image forming apparatus (carriage mounting apparatus)
101 CPU (control means)
110 Charge control unit (monitoring means, charging means)
111 Power storage means 303 Motor

Claims (9)

A carriage movably supported by the apparatus main body, a power storage means for supplying drive power to the carriage, a charging means for charging the power storage means, and moving the carriage from a start position to a target position in a first sequence. A control unit for moving from the target position to the end point position in a second sequence having a smaller average power consumption per moving distance than the first sequence,
When the charged amount of the power storage unit falls below a predetermined stored amount while the carriage is moving in the first sequence, the control unit stops the carriage, and the charging unit controls the power storage unit to store the predetermined charged amount. Charge up to
When the interval between the stop position and the target position is equal to or less than a predetermined value, the control unit moves the carriage from the stop position to the end position in the second sequence after the completion of the charging. Carriage mounting device.   When the interval between the stop position and the target position exceeds the predetermined value, the control means moves the carriage from the stop position to the target position in the first sequence, and moves the carriage from the target position to the end point. The carriage mounting device according to claim 1, wherein the carriage mounting device is moved to a position in the second sequence.   The first sequence includes an acceleration step of accelerating from a stop state to a predetermined speed, and a deceleration step of decelerating from the predetermined speed to a stop state. The predetermined value is required for the acceleration step and the deceleration step. The carriage mounting device according to claim 2, wherein the carriage mounting device is a moving distance of the carriage.   2. The control device according to claim 1, wherein when the interval between the stop position and the target position exceeds the predetermined value, the control unit moves the carriage from the stop position to the end position in the second sequence. 3. Carriage mounting device. A transparent table on which to place the original,
Reading means mounted on the carriage, for scanning and reading an original placed on the table through the table,
The carriage mounting device according to claim 1, further comprising: a DC motor that drives the carriage.   The carriage mounting apparatus according to claim 5, wherein the first sequence is a return operation for returning the carriage to an origin position, and the second sequence is a butting operation for performing origin search of the carriage. A feeding unit for feeding a recording medium;
Recording means mounted on the carriage, for recording an image on a fed recording medium,
First driving means for moving the carriage between a recording area and outside the recording area;
Second driving means for driving the feeding unit;
A switching unit that switches between transmission and non-transmission of a driving force from the second driving unit to the feeding unit according to a position of the carriage outside the recording area;
The first sequence is a return operation for returning the carriage to a standby position for the next feeding operation, and the second sequence is for returning the carriage to a position where the switching unit transmits a driving force to the feeding unit. The carriage mounting device according to claim 1, wherein the carriage mounting device is a trigger operation for moving. A carriage movably supported by the apparatus main body, a power storage means for supplying drive power to the carriage, a charging means for charging the power storage means, and accelerating the carriage from a start position in a stopped state to a first speed Moving at a constant speed at the first speed, decelerating from the first speed, stopping at a target position, accelerating from the target position to a second speed smaller than the first speed, Control means for moving at a constant speed at a speed of
When the charged amount of the power storage unit falls below a predetermined stored amount before the carriage stops at the target position, the control unit stops the carriage, and the charging unit sets the power storage unit to the predetermined stored amount or more. Charge up to
When the interval between the stop position and the target position is equal to or less than a predetermined value, the control unit accelerates the carriage from the stop position to the second speed after the completion of the charging, and A carriage mounted device that moves at a constant speed at a constant speed. A drive control method of a carriage, in which a part of drive power is supplied by a power storage unit and is movably supported by an apparatus main body,
When the charged amount of the power storage means is equal to or more than a predetermined charged amount, the carriage is moved from a start position to a target position in a first sequence. Moving in a second sequence with low average power consumption of
When the charged amount of the power storage unit falls below the predetermined stored amount while the carriage is moving in the first sequence, stopping the carriage and charging the power storage unit to the predetermined stored amount or more; Has,
When the stop position of the carriage is between the start position and the target position, and the interval between the stop position and the target position is equal to or less than a predetermined value, after completion of the charging, the carriage is moved to the position. A drive control method for a carriage, wherein the carriage is moved from the stop position to the end point position in the second sequence.