JP2013111842A - Image processing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image processing apparatus capable of controlling degradation of performance and reliability caused by a strong shock on a movable unit, and eliminating a need to increase a power supply capacity.SOLUTION: An image processing apparatus includes a movable unit for printing or reading an image, a preventive means for preventing the movement of the movable unit from exceeding a predetermined range, an absorbing means for absorbing shocks when the movement of the movable unit is prevented by the preventive means, and a detection means for detecting shocks. The absorbing means forms a portion of the detection means.

Description

  The present invention relates to an image processing apparatus including a carriage and a scanner that reciprocate by driving a motor.

  A method for determining the home position of a carriage that performs reciprocating movement in an image recording apparatus is disclosed in Patent Document 1.

  A home position is set at one end of the movement range of the carriage, and the carriage is moved to the home position side. Then, in order to detect the home position of the carriage, the carriage collides (contacts) with a frame arranged at the end of the carriage movement path. The position when the carriage comes into contact with the movement preventing means or the position set based on the position becomes the home position (reference position) that becomes the reference for subsequent carriage positioning.

  The contact between the carriage and the frame is called “butting” or “collision”. When the carriage moves to the home position side and hits the frame, the current value of the DC motor that drives the carriage increases. In the process of moving the carriage, when the current value of the DC motor becomes a predetermined value or more, it is estimated that the carriage hits the frame on the home position side. Then, it is determined that the carriage has stopped together with the absence of receiving an ON-OFF signal from an encoder or the like that detects the rotation state of the carriage motor. If it is determined that the carriage has stopped, the energization of the carriage motor constituted by the DC motor is stopped, and the position where the carriage has stopped is set as the home position. Alternatively, if it is determined that the carriage has stopped, the carriage motor is controlled to rotate in the reverse direction, and the position returned a certain distance from the stop position is set as the carriage home position.

JP 2010-4713 A

  However, in the method of Patent Document 1, since the carriage is strongly abutted against the frame disposed at the end of the carriage movement path, an impact is applied to the carriage on which the precision component is mounted, and the performance and reliability of the carriage are adversely affected. May affect.

  Further, in the method of Patent Document 1, since it is determined that the carriage has hit the frame on the home position side when the drive current value of the carriage motor exceeds a predetermined value, an excessive current is applied to the carriage motor for the determination. It is necessary to supply. Since the power supply is forced to supply current in an overload state, a large power supply capacity is required.

  These problems occur not only in the case of a carriage having a print head in a printer but also in the case of a scanner having a reading sensor for reading a document.

  The present invention provides an image processing apparatus that suppresses a decrease in performance and reliability due to a strong impact of a moving unit such as a carriage or a scanner included in the image processing apparatus and does not require a large power supply capacity. For the purpose.

  An image processing apparatus according to the present invention includes a moving unit for printing or reading an image, a blocking unit for blocking the movement of the moving unit from exceeding a predetermined range, and blocking the movement of the moving unit by the blocking unit. And a detecting means for detecting the shock, wherein the absorbing means forms a part of the detecting means.

  According to the present invention, there is provided an excellent image processing apparatus that can suppress a reduction in performance and reliability due to a strong impact on a moving unit such as a carriage or a scanner, and that does not require a large power supply capacity. Realize.

It is the external appearance which shows composite type inkjet printer PR1. 1 is a block diagram showing a system configuration of an inkjet printer PR1. The carriage drive unit CRD1 of the inkjet printer PR1 is shown. It is a figure which shows the positional relationship and structure of the carriage 9, and the movement prevention members 7 and 8. FIG. 5 is a flowchart showing an operation for detecting abutment of a carriage 9; It is explanatory drawing of the detection means which detects butting of the carriage. The voltage transition when the carriage 9 hits the movement prevention member 7 is shown. 3 is a diagram illustrating a scanner driving unit 32 of the scanner unit 66. FIG. It is explanatory drawing of the detection means which detects butting of the scanner 67. FIG.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is an external view showing a composite type ink jet printer PR1 having both a printing function and a document reading function as an example of an image processing apparatus.

  The ink jet printer PR1 includes a printing unit (carriage unit) inside, a scanner unit 66 on the upper surface, and a memory card slot unit 74, a host interface unit 73, and a paper discharge unit 5.

  FIG. 2 is a block diagram showing a system configuration of the inkjet printer PR1.

  The ink jet printer PR1 includes a carriage unit 56, a carriage motor control unit 60, movement blocking members 7 and 8 for the carriage 9, a carriage position management unit 62, a CPU 63, a ROM 64, a RAM 65, and a scanner unit 66. The ink jet printer PR1 includes a scanner motor control unit 70, scanner movement preventing members 33 and 34, a scanner position management unit 72, a host interface unit 73, and a memory card slot 74.

  The carriage unit 56 includes a carriage 9 as a reciprocating unit, a carriage motor 58 that drives the carriage 9, and an encoder 59 that detects the rotation of the carriage motor 58. The carriage 9 is mounted with a print head and reciprocates.

  At the time of detecting and setting the home position, the carriage position management unit 62 performs the detection operation of the carriage 9 using the detection signal of the movement blocking member 7 and the detection signal of the encoder 59. The carriage position management unit 62 sends detection data to the CPU 63, and the CPU 63 controls the carriage motor control unit 60 in accordance with the detection data. Even when the position of the carriage 9 opposite to the home position is detected and set, the movement prevention member 8 is used and the control is performed as described above.

  Next, the abutting detection operation during the normal operation will be described. FIG. 3 is a diagram illustrating a carriage driving unit CRD1 that is a printing unit of the inkjet printer PR1.

  The carriage drive unit CRD1 includes a housing 6, movement blocking members 7 and 8, a carriage 9, a carriage motor 58, a belt 13, a cord strip 14, a carriage control line 15, a paper feed unit 16, and a capping. And a mechanism unit 17.

  The movement blocking members 7 and 8 are members that block the movement of the carriage 9 outside a predetermined range when the carriage 9 is moved to set the home position.

  The carriage 9 is one of the reciprocating units. The carriage 9 includes a plurality of ink cartridges 10 and 11 including a print head and an ink tank. The carriage 9 includes a DC motor (DC motor) and a belt 13. Reciprocates in the sub-scanning direction.

  An encoder 59 is incorporated in the carriage 9, and the encoder 59 reads the code strip 14 and uses an output signal of the encoder 59 as position data of the carriage 9.

  A carriage control signal from the CPU and an output signal of the encoder 59 of the carriage 9 are propagated to the carriage control line 15. The paper feeding unit 16 includes a paper feeding roller that transports printing paper. The capping mechanism unit 17 seals the nozzle portion of the print head provided in the carriage 9.

  FIG. 4 is a diagram showing the positional relationship and structure of the carriage 9 and the movement preventing members 7 and 8. Shock absorbing members 18, 19, and 20 are provided on the movement blocking member 7 on the side opposite to the home position. The impact absorbing members 18, 19, and 20 have a function as absorbing means that absorbs and softens the impact applied by the carriage 9 to the movement preventing member 7. Further, the impact absorbing members 18, 19, and 20 constitute a part of detection means for detecting the magnitude of contact impact caused by abutment between the carriage 9 and the movement preventing member 7.

  Specifically, as the impact absorbing members 18, 19, and 20, for example, an impact absorbing material such as rubber is used, and an element in which metal particles are dispersed in rubber is used. That is, the conductive material particles are dispersed in the non-conductive elastic material. As a result, when an impact is caused by abutment between the carriage 9 and the movement preventing member 7, the interval between the metal particles in the rubber is shortened, and the electrical resistance value inside the element is decreased. The shock absorbing members 18, 19 and 20 have a characteristic that the electric resistance value (the value of the internal resistance of the member) changes according to the magnitude of the impact caused by the abutment between the carriage 9 and the movement preventing member 7. As described above, the impact absorbing members 18, 19 and 20, which are means for reducing the impact of the contact, detect the magnitude of the impact of the contact between the carriage 9 and the movement preventing member 7 by changing the internal electrical resistance value. It functions as an impact sensor for making a part of the detection means.

  Similarly, the movement preventing member 8 on the home position side is also provided with impact absorbing members 21, 22, and 23. The structure and function (shock absorbing function and detection function) of the shock absorbing members 21, 22, and 23 are the same as those of the shock absorbing members 18, 19, and 20.

  During the home position detection operation, the carriage 9 moves in the direction of the arrow 25 in FIG. 4 and abuts against the movement preventing member 8. Further, when the position opposite to the home position is detected, the carriage 9 moves in the direction of the arrow 24 in FIG. 4 and abuts against the movement preventing member 7.

  Next, in the first embodiment, a case where the carriage 9 hits the movement preventing member 7 will be described.

  In the home position detection operation, the carriage motor 58 drives the belt 13 and the belt 13 moves, so that the carriage 9 abuts against the movement preventing member 7.

  FIG. 5 is a flowchart illustrating an operation of detecting the abutment of the carriage 9 in the first embodiment.

  In step S0, the home position setting operation of the carriage 9 is started. In step S1, the carriage motor 58 is driven, that is, the energization of the carriage motor 58 is turned on. After the carriage motor 58 is operated at a constant speed in step S2, the CPU 63 determines whether or not the carriage 9 has contacted the impact absorbing member 18 in step S3. Based on the change in the internal resistance value of the shock absorbing member 18, the CPU 63 determines whether the carriage 9 has come into contact with the shock absorbing member 18.

  If it is determined in step S3 that the carriage 9 has contacted the shock absorbing member 18, the CPU 63 determines in step S4 whether the carriage 9 has stopped. Based on both the change in the value of the internal resistance of the shock absorbing member 18 and the signal from the encoder 59, the CPU 63 determines whether or not the carriage 9 has stopped.

  If the carriage 9 has not stopped yet, the CPU 63 shifts the carriage motor 58 to the low speed operation in step S5. If it is determined in step S4 that the carriage 9 has stopped, in step S6, the CPU 63 stops driving the carriage motor 58, and in step S7, the position setting of the home position that serves as a reference position for positioning the carriage is performed. Do.

  Based on both the change in the value of the internal resistance Ra1 of the shock absorbing member 18 and the signal from the encoder 59, it is immediately determined whether the carriage 9 has stopped. If the carriage 9 has not stopped yet, the carriage 9 The motor 58 is immediately shifted to low speed operation. Since the shock absorbing member 18 absorbs and softens the shock, a strong shock is not applied to the carriage 9 and the performance and reliability of the carriage 9 are not adversely affected. In addition, when the carriage 9 needs to be stopped, the carriage motor 58 immediately shifts to the low speed operation, so that an unnecessary large current can be prevented from flowing through the carriage motor 58 and the current capacity of the power source can be increased. There is no need to do.

  The operation when the carriage 9 abuts against the movement preventing member 8 on the home position side is the same as the operation when the carriage 9 abuts against the movement preventing member 7 described above.

  Next, the abutting detection of the carriage 9 will be specifically described. FIG. 6 is an explanatory diagram of detection means for detecting the abutment of the carriage 9. As shown in FIG. 6A, the shock absorbing member 18 forming a part of the detection means has an internal resistance Ra1, and a series resistance of the external resistance R1 and the internal resistance Ra1 is connected to the circuit power supply Vcc. Yes. One end of the internal resistance Ra1 of the shock absorbing member 18 is connected to a circuit GND 28, and a voltage detection unit 29 is connected to a connection point between the shock absorbing member 18 and the external resistor R1.

  The internal resistance Ra1 of the shock absorbing member 18 has a characteristic that the resistance value decreases when a contact force is applied by an object. When the contact force is not applied, that is, when the carriage 9 does not hit, the internal resistance Ra1. The resistance value has a resistance characteristic that is almost infinite (∞). Further, when the carriage 9 abuts against the impact absorbing member 18, the resistance value of the internal resistance Ra1 has a resistance characteristic that decreases to about several KΩ.

  The configuration and resistance characteristics of the shock absorbing members 19 and 20 are the same as the configuration and resistance characteristics of the shock absorbing member 18.

  As shown in FIG. 6B, the shock absorbing member 21 has an internal resistance Ra2, and the series resistance of the external resistance R1 and the internal resistance Ra2 is connected to the circuit power supply Vcc. That is, one end of the internal resistance Ra2 of the shock absorbing member 21 is connected to the circuit GND 31, and the voltage detection unit 29 is connected to the connection point between the shock absorbing member 21 and the external resistor R1.

  The internal resistance Ra2 of the shock absorbing member 21 has a characteristic that the resistance value decreases when a contact force is applied by an object. When the contact force is not applied, that is, when the carriage 9 does not hit, the internal resistance Ra2 The resistance value has a resistance characteristic that is almost infinite (∞). Further, when the carriage 9 hits the impact absorbing member 21, the resistance value of the internal resistance Ra2 has a resistance characteristic that decreases to about several KΩ.

  The configuration and resistance characteristics of the shock absorbing members 22 and 23 are the same as the configuration and resistance characteristics of the shock absorbing member 21.

  As described above, the abutment of the carriage 9 is detected based on the voltage change of the voltage detection unit 29 using the resistance value change of the internal resistance of the shock absorbing member, and the code strip 14 of the encoder 59 is read. The carriage motor 58 is controlled based on the data. In this way, the home position is detected and set.

  When detecting a position opposite to the home position, as shown in FIG. 6C, the voltage of the voltage detector 29 is Vcc × Ra1 / (Ra1 + R1), and Ra1 = ∞. The voltage of 29 is approximately Vcc.

  In the end state (stop state) of the abutting operation of the carriage 9 against the movement prevention member 7, the resistance value of the internal resistance Ra1 changes from ∞ to several KΩ, so that the voltage of the voltage detection unit 29 is Vcc × Ra1 / From (Ra1 + R1), the potential becomes lower than the circuit voltage Vcc. When the value of the external resistor R1 is set to about 4.7 KΩ, Ra1≈R1 is satisfied, so that the potential of the voltage detector 29 is Vcc / 2.

  Based on the read data of the code strip 14 of the encoder 59, the carriage motor 58 is controlled to detect a position opposite to the home position.

  In a state where the carriage 9 is not in contact with the movement blocking member 8 (moving state), as shown in FIG. 6D, the voltage of the voltage detecting unit 29 is Vcc × Ra2 / (Ra2 + R1), and Ra2 = ∞. Therefore, the voltage of the voltage detector 29 is approximately Vcc.

  In the end state (stopped state) of the abutting operation of the carriage 9 against the movement blocking member 8, the resistance value of the internal resistance Ra2 changes from ∞ to several KΩ, so that the voltage of the voltage detection unit 29 is Vcc × Ra2 / From (Ra2 + R1), the potential becomes lower than the circuit voltage Vcc. When the value of the external resistor R1 is set to about 4.7 KΩ, Ra2≈R1 is satisfied, and therefore the potential of the voltage detection unit 29 is Vcc / 2.

  FIG. 7 is a diagram illustrating voltage transition of the voltage detection unit 29 when the carriage 9 is normally driven and when the carriage 9 is in an abnormal operation and hits against the movement preventing member 7.

  When the carriage 9 is not in contact with the movement blocking member 7 (moving state), the voltage of the voltage detection unit 29 of the shock absorbing member 18 is Vcc × Ra1 / (Ra1 + R1), and Ra1 = ∞. The voltage at section 29 is approximately Vcc.

  FIG. 7A is an explanatory diagram of the abutting operation in a normal state. When the carriage 9 is in contact with the movement blocking member 7 (stopped state), the voltage of the voltage detecting unit 29 of the shock absorbing member 18 is Vcc × Ra1 / (Ra1 + R1), and the value of the resistance R1 is about 4.7 KΩ. When set, Ra1≈R1. Therefore, when the carriage 9 is normally driven, the voltage of the voltage detector 29 of the shock absorbing member 18 is Vcc / 2.

  By the way, when the carriage 9 violently hits the movement preventing member 7 due to an abnormal operation of the carriage motor 58, the abutting force (contact force) of the carriage 9 against the impact absorbing member 18 is a normal abutting operation. Compared with, it is a large force (impact). The greater the abutting impact, the smaller the resistance value of the internal resistance Ra1 of the impact absorbing member 18, so that the detection potential of the voltage detection unit 29 becomes smaller as shown in FIG. 7B.

  For example, since Ra1 << 4.7KΩ, when the carriage 9 is operating abnormally, the detection voltage of the voltage detection unit 29 is detected voltage Va1 ′ during abnormal operation with respect to detection voltage Va1 ′ during normal operation. If ', then Va1' '<< Va1'.

  As described above, the CPU 63 determines whether or not the magnitude of the impact caused by the contact is equal to or greater than a predetermined value. When the CPU 63 determines that the magnitude of the impact is equal to or greater than the predetermined value, the CPU 63 drives the DC motor as the carriage motor 58. Stop.

  In the first embodiment, it is possible to determine whether or not the carriage 9 is normally driven by using the detection voltages Va1 and Va2 in the abutting operation of the carriage 9. Further, the impact absorbing members 18, 19, 20 or the impact absorbing members 21, 22, 23 have an effect of reducing the impact of the carriage 9.

  Note that when the carriage 9 is stopped by stopping the driving of the carriage motor 58, notification means for notifying the user of the stop contents by display or sound may be provided.

  The above description is an example of a carriage on which a reciprocating moving unit is mounted with a print head for printing an image. The present invention is not limited to this, and the present invention can be similarly applied even to a scanner in which the moving unit is mounted with a reading sensor for reading an image and reciprocates. An example applied to the scanner unit 66 constituting the ink jet printer PR1 shown in FIG. 2 will be described below.

  2, the scanner unit 66, the scanner motor control unit 70, the scanner movement preventing members 33 and 34, the scanner position management unit 72, the CPU 63, the ROM 64, and the RAM 65 are included.

  The scanner unit 66 includes a scanner 67, a scanner motor 68, and an encoder 69. The scanner 67 reads a document. The scanner motor 68 drives the scanner. The encoder 69 detects the rotation of the scanner motor 68.

  FIG. 8A is a diagram showing the scanner drive unit 32 of the scanner unit 66, and is a drawing of the scanner unit 66 drawn through the glass. FIG. 8B is a diagram showing the positional relationship between the scanner 67 and the movement preventing members 33 and 34.

  The scanner 67 is a reciprocating unit. The movement preventing member 33 is provided on the home position side, and the movement preventing member 34 is provided on the side opposite to the home position. The movement preventing member 33 is provided with shock absorbing members 43, 45 and 47, and the movement preventing member 34 is provided with shock absorbing members 44, 46 and 48.

  The ink jet printer PR1 has an ADF function. Therefore, there are two home positions of the scanner 67: a home position 38 during normal sheet scanning and a home position 39 during ADF. When the scanner 67 is installed at either the home position 38 during sheet scanning or the home position 39 during ADF, the shading pattern 40 is read.

  The scanner motor 68 is a DC motor and also includes an encoder 69. By driving the scanner motor 68 during the home position detection operation, the scanner 67 moves in the direction of the arrow 41. Similarly, the scanner 67 is moved in the direction of the arrow 42 by driving the scanner motor 68 at the time of detecting the position opposite to the home position.

  The shock absorbing members 43, 45, 47 provided on the movement preventing member 33 have a characteristic (internal resistance) in which the electrical resistance value decreases when the abutting force (contact force) at the time of abutment of the scanner 67 increases. doing. The impact absorbing members 44, 46 and 48 also have a characteristic (internal resistance) that the electrical resistance value decreases as the contact force increases, as in the above-described embodiment.

  FIG. 9 is an explanatory diagram of detection means for detecting the abutment of the scanner 67. In the home position detection operation, the scanner 67 abuts against the impact absorbing member 43 of the movement preventing member 33 by driving the scanner motor 68.

  The shock absorbing member 43 that forms part of the detection means has an internal resistance Ra3, and as shown in FIG. 9A, a series resistance of an external resistance R1 and an internal resistance Ra3 is connected to the circuit power supply Vcc. Yes. One end of the internal resistance Ra3 of the shock absorbing member 43 is connected to the circuit GND 51, and a voltage detection unit 49 is connected to a connection point between the shock absorbing member 43 and the external resistor R1.

  The internal resistance Ra3 included in the shock absorbing member 43 has a characteristic that the resistance value decreases when a contact force is applied by an object. When the contact force is not applied, that is, when the scanner 67 does not hit, the internal resistance Ra3. The resistance value has a resistance characteristic that is almost infinite (∞). Further, when the scanner 67 hits the impact absorbing member 43, the resistance value of the internal resistance Ra3 has a resistance characteristic that decreases to about several KΩ.

  The configuration and resistance characteristics of the shock absorbing members 45 and 47 are the same as the configuration and resistance characteristics of the shock absorbing member 43. The configuration and resistance characteristics of the shock absorbing members 44, 46, and 48 are the same as the configuration and resistance characteristics of the shock absorbing member 43. However, as shown in FIG. 9B, the shock absorbing members 44, 46 and 48 have an internal resistance Ra4 instead of the internal resistance Ra3, and are connected to the circuit GND 54 instead of the circuit GND 51. ing.

  Next, the operation of the impact absorbing member 43 detecting the abutting operation of the scanner 67 against the movement preventing member 33 will be described.

  When the scanner 67 is not in contact with the movement blocking member 33 (moving state), Ra3 = ∞, and the voltage of the voltage detection unit 49 of the shock absorbing member 43 is Vcc × Ra3 / (Ra3 + R1). Therefore, the voltage Va3 of the voltage detector 49 is approximately Vcc as shown in FIG. 9C.

  When the abutting operation of the scanner 67 against the movement preventing member 33 is completed (stopped), Ra3≈R1, and the voltage of the voltage detection unit 49 of the shock absorbing member 43 is Vcc × Ra3 / (Ra3 + R1). Here, when the value of the external resistor R1 is set to about 4.7 KΩ, the voltage Va3 = Vcc × Ra3 / (Ra3 + R1) ≈Vcc / 2 of the voltage detection unit 49 of the shock absorbing member 43 is obtained.

  The operation by the shock absorbing members 45 and 47 is the same as the operation of the shock absorbing member 43. Further, when the position opposite to the home position is detected, the movement blocking member 34 and the shock absorbing members 44, 46, and 48 can be used to detect in the same manner as described above (see FIG. 9D).

  The change in resistance value of the internal resistances Ra3, Rb3, Rc3, Ra4, Rb4, and Rc4 provided in each of the shock absorbing members 43, 44, 45, 46, 47, and 48, that is, the voltage change is the scanner position management. Sent to the unit 72. The scanner position management unit 72 sends detection data combined with the position data received from the encoder 69 to the CPU 63, and the CPU 63 controls the scanner motor control unit 70 in accordance with the detection data, via the scanner motor 68. The speed and position of the scanner 67 are controlled.

  For example, based on a signal indicating the value of the internal resistance Ra4 of the shock absorbing member 44 and a signal from the encoder 69, it is immediately determined whether the scanner 67 has stopped. If the scanner 67 has not stopped yet, The motor 68 is immediately shifted to low speed operation.

  Since the impact absorbing member absorbs and softens the impact of the contact, a strong impact is not applied to the scanner 67, and the performance and reliability of the scanner 67 are not adversely affected. Further, when the scanner 67 needs to be stopped, the scanner motor 68 is immediately shifted to the low speed operation, so that an unnecessary large current can be prevented from flowing through the scanner motor 68, and the power supply of the ink jet printer PR1 can be suppressed. There is no need to increase the current capacity.

  By the way, although all the above embodiment is a form with which the impact-absorbing member was provided in the movement prevention member, this invention is not limited to this. Since the detection of the contact impact is only required to detect that the movement blocking member and the reciprocating unit are in contact with each other, the impact absorbing member may be provided anywhere. Therefore, the same operational effects can be obtained even when the shock absorbing member which is a part of the detecting means is provided on the reciprocating unit side or on both the movement preventing member and the reciprocating unit. If taking these forms, the structure which provides the impact-absorbing member which has the detection function similar to what was mentioned above in the site | part which contacts a movement prevention member in the both sides of the reciprocating direction of a reciprocating movement unit (carriage or scanner). It becomes.

DESCRIPTION OF SYMBOLS 9 ... Carriage 7, 8, 33, 34 ... Movement prevention member 18-23, 43-48 ... Shock absorption member 58 ... Carriage motor 67 ... Scanner

Claims (8)

A mobile unit for printing or reading images;
Blocking means for blocking movement of the mobile unit from exceeding a predetermined range;
An absorbing means for absorbing an impact when the movement of the moving unit is blocked by the blocking means;
Detecting means for detecting the impact;
And the absorption means forms part of the detection means.   The image processing apparatus according to claim 1, wherein the absorbing unit is provided as a part of the blocking unit.   The image processing apparatus according to claim 1, wherein the absorption unit is provided in the moving unit.   The image processing apparatus according to claim 1, further comprising a control unit that controls driving of a motor that moves the moving unit based on detection by the detection unit.   The image processing apparatus according to claim 4, wherein the control unit determines a reference position for movement of the moving unit based on detection by the detection unit.   The absorption means has a characteristic that an electric resistance value changes according to the magnitude of the impact, and the detection means detects an impact from the change in the electric resistance value. The image processing apparatus according to any one of the above.   The absorption means has a structure in which particles of a conductive material are dispersed in a non-conductive elastic material, and an internal electrical resistance value changes according to the magnitude of the impact. 6. The image processing apparatus according to 6.   The image processing apparatus according to claim 1, wherein the moving unit is a carriage on which a print head that performs reciprocal movement is mounted, or a scanner on which a sensor that reads a document is mounted.

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