Patent Publication Number: US-11654696-B2

Title: Printing apparatus

Description:
The present application is based on, and claims priority from JP Application Serial Number 2020-088717, filed May 21, 202, the disclosure of which is hereby incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to a printing apparatus that performs printing on a medium while being manually moved relative to the medium. 
     2. Related Art 
     There has been a known handy mobile printer (hereinafter, referred to as “handy printer”) that performs printing on a medium while being manually moved relative to the medium, as disclosed in JP-A-2019-217732 and JP-A-2020-040278. The handy printer includes a battery, a position detection sensor, and an opening in which a printing head is placed. The battery, the position detection sensor, and the opening are arranged in the order of the battery, the position detection sensor, and the opening. 
     In the handy printer of related art, since the position detection sensor is interposed between the opening, where the printing head is disposed, and the battery, which is a heavy object, the barycenter of the handy printer is located in a position away from the printing head. The handy printer of related art is therefore problematic in that the printing head is easily shifted when the user manually moves the handy printer relative to the medium. 
     SUMMARY 
     A printing apparatus according to an aspect of the present disclosure is a printing apparatus that performs printing on a medium while being manually moved relative to the medium, the printing apparatus including a battery housing section that houses a battery, a head placement section where a printing head that performs printing on the medium is placed, and a movement measurement section that optically measures the movement of the printing apparatus relative to the medium, and the battery housing section, the head placement section, and the movement measurement section are arranged in an order of the battery housing section, the head placement section, and the movement measurement section. 
     A printing apparatus according to another aspect of the present disclosure is a printing apparatus that performs printing on a medium while being manually moved relative to the medium, the printing apparatus including a head placement section where a printing head that performs printing on the medium is placed and a movement measurement section that optically measures the movement of the printing apparatus relative to the medium, and when the printing apparatus is projected onto the medium in a posture in which the printing apparatus is capable of performing printing on the medium, a first barycenter distance between an apparatus barycenter that is a barycenter of the printing apparatus and the printing head is shorter than a second barycenter distance between the apparatus barycenter and the movement measurement section. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a block diagram showing a printing system. 
         FIG.  2    shows printed matter formed of a medium on which a print image has been printed by a printing apparatus. 
         FIG.  3    is a perspective view of an ink cartridge. 
         FIG.  4    is a perspective view of the printing apparatus according to a first embodiment. 
         FIG.  5    shows the printing apparatus according to the first embodiment viewed from the negative side of a direction X with a first enclosure located in a blocking position. 
         FIG.  6    shows the printing apparatus according to the first embodiment viewed from the negative side of the direction X with the first enclosure located in an unblocking position. 
         FIG.  7    shows the printing apparatus according to the first embodiment viewed from the negative side of a direction Z. 
         FIG.  8    shows the printing apparatus according to the first embodiment projected onto the medium. 
         FIG.  9    shows the printing apparatus according to the first embodiment hung via a strap. 
         FIG.  10    shows the printing apparatus according to the first embodiment in a state in which the first enclosure is hung from a second enclosure. 
         FIG.  11    shows the printing apparatus according to a second embodiment viewed from the side facing the negative side of the direction X when the second enclosure is located in the blocking position. 
         FIG.  12    shows the printing apparatus according to the second embodiment viewed from the side facing the negative side of the direction X when the second enclosure is located in the unblocking position. 
         FIG.  13    shows the printing apparatus according to the second embodiment in the state in which the first housing is hung from the second enclosure. 
         FIG.  14    shows the printing apparatus according to a variation viewed from the negative side of the direction Z. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     A printing apparatus  101 A, which is a first embodiment of the printing apparatus, and a printing apparatus  101 B, which is a second embodiment of the printing apparatus, will be described below with reference to the accompanying drawings. When it is not necessary to distinguish the printing apparatus  101 A according to the first embodiment and the printing apparatus  101 B according to the second embodiment from each other, they are simply referred to as a “printing apparatus  101 ”. The following description will be made by using directions defined in an XYZ orthogonal coordinate system shown in each figure, but the directions are for convenience of the description only and are not at all intended to limit the following embodiments. 
     Printing System 
     A printing system Sy includes an information processing apparatus  1  and the printing apparatus  101 , as shown in  FIG.  1   . The information processing apparatus  1  and the printing apparatus  101  are communicably connected to each other in a wired or wireless manner. 
     The information processing apparatus  1  transmits a print job to the printing apparatus  101 . The information processing apparatus  1  can, for example, be a smartphone, a tablet terminal, or a personal computer. 
     The printing apparatus  101  is what is called a handy printer and prints, while being manually moved relative to a medium  201 , a print image  203  on the medium  201  based on the print job received from the information processing apparatus  1 , as shown in  FIG.  2   . That is, the printing apparatus  101  produces printed matter  205 , which is the medium  201  on which the print image  203  has been printed. The printing apparatus  101  prints the print image  203  on the medium  201  by discharging ink onto the medium  201  based on an inkjet method while the printing apparatus  101  is manually moved relative to the medium  201 . The medium  201  is not limited to a print sheet and can, for example, be an envelope, a postal card, a business card, a corrugated sheet, a notepad, a CD (compact disc), and a wooden plate. 
     Ink Cartridge 
     An ink cartridge  301  includes an ink tank  303  and a printing head  305 , as shown in  FIG.  3   . The ink cartridge  301  is detachably loaded into the printing apparatus  101  (see  FIG.  5   ). 
     The ink tank  303  is formed in a substantially-box-like shape. The ink tank  303  stores the ink. The printing head  305  is formed in a substantially-box-like shape smaller than that of the ink tank  303  and is provided on a surface of the ink tank  303  that is the surface facing the negative side of the direction Z at an end portion facing the negative side of the direction Y. 
     The printing head  305  is an inkjet head including a plurality of nozzles  307  (see  FIG.  7   ) and prints the print image  203  on the medium  201  by discharging the ink supplied from the ink tank  303  via the plurality of nozzles  307 . 
     Printing Apparatus According to First Embodiment 
     The printing apparatus  101 A according to the first embodiment will be described with reference to  FIGS.  4  to  10   . The printing apparatus  101 A is formed in a substantially-box-like shape. The printing apparatus  101 A includes a first enclosure  103  and a second enclosure  105 . The first enclosure  103  is so connected to an end portion of the second enclosure  105  that is the end portion facing the negative side of the direction Y as to be pivotable via a connection mechanism  107  provided at an end portion of the first enclosure  103  that is the end portion facing the negative side of the direction Y. A hinge can, for example, be used as the connection mechanism  107 . The first enclosure  103  is pivotable between a blocking position (see  FIG.  5   ) where the first enclosure  103  blocks a cartridge loading section  109  provided in the second enclosure  105  and an unblocking position (see  FIG.  6   ) where the first enclosure  103  unblocks the cartridge loading section  109 . To replace the ink cartridge  301 , a user causes the first enclosure  103  to pivot to block and unblock the cartridge loading section  109 . 
     The first enclosure  103  includes a first extending section  111 , which extends in the direction Y in the blocking position, and a second extending section  113 , which extends in the direction Z in the blocking position. When the first enclosure  103  is caused to pivot to the blocking position, the first extending section  111  blocks a surface of the second enclosure  105  that is the surface facing the positive side of the direction Z, and the second extending section  113  approaches a surface of the second enclosure  105  that is the surface facing the negative side of the direction Y (see  FIG.  5   ). When the first enclosure  103  is caused to pivot to the unblocking position, the first extending section  111  unblocks a surface of the second enclosure  105  that is the surface facing the positive side of the direction Z, and the second extending section  113  moves away from a surface of the second enclosure  105  that is the surface facing the negative side of the direction Y (see  FIG.  6   ). 
     A first engaging section  115  is provided at an end portion of the first extending section  111  that is an end portion facing the positive side of the direction Y. The first engaging section  115  engages with a second engaging section  117  provided in the second enclosure  105  when the first enclosure  103  is caused to pivot to the blocking position. The first enclosure  103  is thus locked in the blocking position. When the user disengages the first engaging section  115  from the second engaging section  117 , the first enclosure  103  is pivotable from the blocking position to the unblocking position. 
     A printing button  119  and a power button  121  are provided at a surface of the first extending section  111  that is the surface facing the positive side of the direction Z (see  FIG.  4   ). The printing button  119  accepts a printing start instruction from the user. The user can cause the printing apparatus  101 A to print the print image  203  (see  FIG.  2   ) by placing the printing apparatus  101 A on the medium  201 , pressing the printing button  119 , and then moving the grasped printing apparatus  101 A along the surface of the medium  201 . The power button  121  accepts a power ON/OFF switching instruction from the user. 
     A strap hole  129  is provided in a surface of the second extending section  113  that is the surface facing the negative side of the direction Y (see  FIG.  4   ). A strap  135  (see  FIG.  9   ) is attachable to the strap hole  129 . The user can carry the printing apparatus  101 A with the printing apparatus  101 A hung via the strap  135  attached to the strap hole  129 . The strap hole  129  may instead be provided in a surface of the second enclosure  105  that is the surface facing the negative side of the direction Y. 
     A battery housing section  123  is provided in the second extending section  113 , as shown in  FIGS.  5  and  6   . The battery housing section  123  houses a battery  401 . The battery  401  supplies each portion of the printing apparatus  101 A with electric power. The battery  401  is housed in the battery housing section  123  in advance at the time of shipment of the printing apparatus  101 A. Coupling the printing apparatus  101 A, for example, to a commercial power source via a cable allows the battery  401  to be charged while being housed in the battery housing section  123 . 
     The second enclosure  105  is formed in a substantially-box-like shape that is open in the direction +Z. The second enclosure  105  is provided with the cartridge loading section  109 . The ink cartridge  301  is detachably loaded in the direction +Z into the cartridge loading section  109 . 
     The cartridge loading section  109  includes a tank placement section  125  and a head placement section  127 . The tank placement section  125  is a substantially-box-shaped space that is open in the direction +Z. When the ink cartridge  301  is loaded into the cartridge loading section  109 , the ink tank  303  is placed in the tank placement section  125 . The head placement section  127  is a substantially-box-shaped space smaller than the tank placement section  125  and is so provided as to be shifted from the tank placement section  125  in the direction −Z. An end of the head placement section  127  that is the end facing the negative side of the direction Z is open toward a surface of the second enclosure  105  that is the surface facing the negative side of the direction Z (see  FIG.  7   ). When the ink cartridge  301  is loaded into the cartridge loading section  109 , the printing head  305  is placed in the head placement section  127 . 
     The second engaging section  117  is provided at an end portion of the second enclosure  105  that is the end portion facing the positive side of the direction Y. The second engaging section  117  engages with the first engaging section  115  provided in the first enclosure  103  when the first enclosure  103  is caused to pivot to the blocking position, as described above. 
     A movement measurement section  131  and a plurality of rollers  133  are provided at a surface of the second enclosure  105  that is the surface facing the negative side of the direction Z, in addition to the printing head  305  disposed in the head placement section  127 , as shown in  FIG.  7   . 
     The movement measurement section  131  optically measures the movement of the printing apparatus  101 A moved by the user on the medium  201 . Measuring the movement of the printing apparatus  101 A means measuring the movement direction and the movement distance of the printing apparatus  101 A. The movement measurement section  131  includes, for example, a light source, such as an LED (light emitting diode), and an image sensor, and can measure the movement relative to the medium  201  based on a change in an image of the medium  201  outputted by the image sensor. 
     The plurality of rollers  133  are in sliding contact with the medium  201  and rotate to guide the movement of the printing apparatus  101 A relative to the medium  201  in the direction X. 
     When the user moves the printing apparatus  101 A relative to the medium  201 , the printing apparatus  101 A calculates the position of the printing apparatus  101 A relative to the medium  201  based on the result of the measurement performed by the movement measurement section  131 . The printing apparatus  101 A then discharges the ink via the plurality of nozzles  307  at a timing corresponding to the relative position based on the result of the measurement performed by the movement measurement section  131 . The printing apparatus  101 A can thus print the print image  203  in an appropriate position on the medium  201  irrespective of the speed at which the user moves the printing apparatus  101 A. 
     When the printing apparatus  101 A is viewed in the direction −Z, the battery housing section  123 , the head placement section  127 , and the movement measurement section  131  are sequentially arranged in the direction −Y in the order of the battery housing section  123 , the head placement section  127 , and the movement measurement section  131 , as shown in  FIG.  7   . That is, the battery  401 , which is a heavy object, and the printing head  305  are located closer to each other than in the related art, in which the movement measurement section  131  is interposed between the head placement section  127 , in which the printing head  305  is disposed, and the battery housing section  123 , which houses the battery  401 . Therefore, when the user manually moves the printing apparatus  101 A relative to the medium  201 , and even if the printing apparatus  101 A is shifted on the medium  201 , the distance between the barycenter of the printing apparatus  101 , which is the center of rotation thereof, and the printing head  305  is short, whereby the amount of shift of the printing head  305  can be reduced. The printing apparatus  101 A can therefore print the print image  203  on the medium  201  with higher precision than in the related art. 
     Further, an apparatus barycenter G, which is the barycenter of the printing apparatus  101 A, is shifted toward the head placement section  127  from a battery-head intermediate position M, which is an intermediated position between the battery housing section  123  and the head placement section  127  in the direction Y, in which the battery housing section  123 , the head placement section  127 , and the movement measurement section  131  are arranged. That is, the distance between the apparatus barycenter G and the head placement section  127 , where the printing head  305  is disposed, is shorter than the distance between the apparatus barycenter G and the battery housing section  123 , which houses the battery  401 . Therefore, when the user manually moves the printing apparatus  101 A relative to the medium  201 , and even if the printing apparatus  101 A is shifted on the medium  201 , the amount of shift of the printing head  305  can be more effectively reduced because the distance between the vicinity of the apparatus barycenter G, which is the center of rotation of the printing apparatus  101 A, and the printing head  305  is short. 
     The apparatus barycenter G means the barycenter of the printing apparatus  101 A at the time of printing. That is, the apparatus barycenter G means the barycenter of the printing apparatus  101 A in the state in which the battery  401  is housed in the battery housing section  123  and the ink cartridge  301  is loaded into the cartridge loading section  109 . In a case where a member to be removed at the time of printing, such as a cover, is attachable and detachable to and from the printing apparatus  101 A, the apparatus barycenter G means the barycenter of the printing apparatus  101 A in the state in which the member is removed. Further, the intermediate position between the battery housing section  123  and the head placement section  127  means an intermediate position between the center of the battery housing section  123  and the center of the head placement section  127 . 
     When the printing apparatus  101 A is projected on the medium  201  in the state in which the printing head  305  placed in the head placement section  127  and in a posture in which the printing apparatus  101 A can perform printing on the medium  201 , that is, in a posture in which the printing head  305  faces the medium  201 , a first barycenter distance D 1  between the apparatus barycenter G and the printing head  305  is shorter than a second barycenter distance D 2  between the apparatus barycenter G and the movement measurement section  131 , as shown in  FIG.  8   . The first barycenter distance D 1  between the apparatus barycenter G and the printing head  305  means the distance between the apparatus barycenter G and the center of the printing head  305 . The second barycenter distance D 2  between the apparatus barycenter G and the movement measurement section  131  means the distance between the apparatus barycenter G and the center of the movement measurement section  131 . Further, the distance between the apparatus barycenter G and the center of the battery  401  is called a third barycenter distance D 3 , and the first barycenter distance D 1  is shorter than the third barycenter distance D 3 . 
     The apparatus barycenter G is located in a position close the printing head  305 , as described above. Therefore, when the user manually moves the printing apparatus  101 A relative to the medium  201 , and even if the printing apparatus  101 A is shifted on the medium  201 , the amount of shift of the printing head  305  can be reduced because the distance between the vicinity of the apparatus barycenter G, which is the center of rotation of the printing apparatus  101 A, and the printing head  305  is short. The printing apparatus  101 A can therefore print the print image  203  on the medium  201  with high precision. 
     When the printing apparatus  101 A is viewed in the direction −Z, the strap hole  129 , the battery housing section  123 , the head placement section  127 , and the movement measurement section  131  are arranged in the order of the strap hole  129 , the battery housing section  123 , the head placement section  127 , and the movement measurement section  131 , as shown in  FIG.  7   . That is, since the head arrangement section  127  or the movement measurement section  131  is not interposed between the battery housing section  123 , which houses the battery  401 , and the strap hole  129 , the battery  401  is located in a position close to the strap hole  129 . 
     Therefore, when the printing apparatus  101 A is hung from the user&#39;s hand H via the strap  135  attached to the strap hole  129 , the distance between the user&#39;s hand H, which serves as the center of rotation of the printing apparatus  101 A, and the battery  401 , which is a heavy object, is short, as shown in  FIG.  9   , whereby the amount of shift of the printing apparatus  101 A can be reduced. The user can therefore stably carry the printing apparatus  101 A with the printing apparatus  101 A hung from the hand H via the strap  135 , as compared with a case where the distance between the user&#39;s hand H, which serves as the center of rotation of the printing apparatus  101 A, and the battery  401 , which is a heavy object, is long. 
     As shown in  FIG.  5   , when the first enclosure  103  is located in the blocking position, that is, when the first enclosure  103  blocks the cartridge loading section  109 , a first connection distance L 1  between the connection mechanism  107  and the battery housing section  123  is shorter than a second connection distance L 2  between the connection mechanism  107  and the movement measurement section  131  in the Y direction. That is, the battery  401  housed in the battery housing section  123  is located in a position close to the connection mechanism  107 . 
     Therefore, when the user grips the second enclosure  105  out of the first enclosure  103  and the second enclosure  105  in the state in which the first engaging section  115  and the second engaging section  117  disengage from each other, the distance between the connection mechanism  107 , which is the center of rotation of the first enclosure  103  hung from the second enclosure  105 , and the battery  401 , which is a heavy object, is short, as shown in  FIG.  10   , whereby the amount of shift of the first enclosure  103  can be reduced. Therefore, to replace the ink cartridge  301 , the user can stably hold the printing apparatus  101 A even in the state in which the first enclosure  103  is hung from the second enclosure  105 . 
     Printing Apparatus According to Second Embodiment 
     The printing apparatus  101 B according to the second embodiment will be described with reference to  FIGS.  11  to  13   . Out of the configurations of the printing apparatus  101 B, the same configurations as those of the printing apparatus  101 A will not be described. 
     The printing apparatus  101 B includes a first enclosure  103  and a second enclosure  105 . The second enclosure  105  is pivotably coupled to an end portion of the first enclosure  103  that is an end portion facing the negative side of the direction Y via the connection mechanism  107  provided at an end portion of the second enclosure  105  that is an end portion facing the negative side of the direction Y. The second enclosure  105  is pivotable between a blocking position (see  FIG.  11   ) where the second enclosure  105  blocks the cartridge loading section  109  and an unblocking position (see  FIG.  12   ) where the second enclosure  105  unblocks the cartridge loading section  109  provided in the first enclosure  103 . 
     The first enclosure  103  is formed in a substantially box-like shape having part of the surface in the +Z direction being open. The battery housing section  123  and the cartridge loading section  109  are provided in the first enclosure  103 . The battery housing section  123  is so provided as to be shifted from the cartridge loading section  109  in the direction −Y. The first engaging section  115  is provided at an end portion of the first enclosure  103  that is an end portion facing the positive side of the direction Y. 
     The second enclosure  105  is formed in a substantially-oblong-plate-like shape. The second engaging section  117  is provided at an end portion of the second enclosure  105  that is an end portion facing the positive side of the direction Y. The second engaging section  117  engages with the first engaging section  115  provided in the first enclosure  103  when the second enclosure  105  is caused to pivot to the blocking position. The second enclosure  105  is thus locked in the blocking position. When the user disengages the second engaging section  117  from the first engaging section  115 , the second enclosure  105  is pivotable from the blocking position to the unblocking position. 
     When the second enclosure  105  is located in the blocking position, that is, when by the second enclosure  105  blocks the cartridge loading section  109 , the first connection distance L 1  between the connection mechanism  107  and the battery housing section  123  is shorter than the second connection distance L 2  between the connection mechanism  107  and the movement measurement section  131  in the Y direction, as shown in  FIG.  11   . That is, the battery housing section  123  is located in a position close to the connection mechanism  107 . 
     Therefore, when the user grips the second enclosure  105  out of the first enclosure  103  and the second enclosure  105  in the state in which the first engaging section  115  and the second engaging section  117  disengage from each other, the distance between the connection mechanism  107 , which serves as the center of rotation of the first enclosure  103  hung from the second enclosure  105 , and the battery  401 , which is a heavy object, is short, as shown in  FIG.  13   , whereby the amount of shift of the first enclosure  103  can be reduced. Therefore, to replace the ink cartridge  301 , the user can stably hold the printing apparatus  101 B even in the state in which the first enclosure  103  is hung from the second enclosure  105 . 
     Other Variations 
     Needless to say, the present disclosure is not limited to the embodiments described above, and a variety of other configurations can be employed to the extent that they do not depart from the substance of the present disclosure. For example, the embodiments described above can be changed to the following forms in addition to the forms described above. Further, the embodiments and variations may be combined with each other. 
     The apparatus barycenter G does not necessarily deviate from the head placement section  127  in the Y direction and may be located in a position where the apparatus barycenter G overlaps with the head placement section  127  in the Y direction, as shown in  FIG.  14   . Therefore, when the user manually moves the printing apparatus  101 A relative to the medium  201 , and even if the printing apparatus  101 A is shifted on the medium  201 , the distance between the vicinity of the apparatus barycenter G, which is the center of rotation of the printing apparatus  101 A, and the printing head  305  is very small, whereby the amount of shift of the printing head  305  can be more effectively reduced. 
     The battery housing section  123  does not necessarily house the battery  401  at the time of shipment of the printing apparatus  101 , and the user may be house the battery  401  purchased separately from the printing apparatus  101 . Further, the battery  401  is not necessarily be chargeable while being housed in the battery housing section  123  and may be replaceable with another battery  401 . The battery  401  may, of course, be a primary battery. 
     The printing head  305  is not necessarily provided in the ink cartridge  301  and may be provided in the printing apparatus  101  separately from the ink cartridge  301 . That is, the concept in which the printing head  305  is placed in the head placement section  127  is not limited to the configuration in which the ink cartridge  301  is loaded into the cartridge loading section  109  and the printing head  305  is in turn placed in the head placement section  127  and includes a configuration in which the printing head  305  is fixed in advance to the head placement section  127 . 
     In addition to the movement measurement section  131 , another movement measurement section may be provided, and the results of the measurement performed by the plurality of movement measurement sections may be combined with one another for more accurate measurement. The other movement measurement section may measure the movement of the printing apparatus  101 , for example, by performing inertial measurement. The other movement measurement section, a control substrate that controls the printing apparatus  101 , and other components may be appropriately disposed in positions where the mechanism described above is not present. 
     The connection mechanism  107  does not necessarily have the structure that only rotates like a hinge and may be a mechanism that both rotates and slides. 
     The printing head  305  is not limited to an inkjet head, and may, for example, be a thermal head that performs printing based on a heat transfer method. 
     Additional Remarks 
     The printing apparatus will be additionally described below. 
     The printing apparatus is a printing apparatus that performs printing on a medium while being manually moved relative to the medium and includes a battery housing section that houses a battery, a head placement section where a printing head that performs printing on the medium is placed, and a movement measurement section that optically measures the movement of the printing apparatus relative to the medium, and the battery housing section, the head placement section, and the movement measurement section are arranged in the order of the battery housing section, the head placement section, and the movement measurement section. 
     According to the configuration described above, since the movement measurement section is not interposed between the head placement section, where the printing head is placed, and the battery housing section, which houses the battery, the battery, which is a heavy object, is located in a position close to the printing head. Therefore, when the user manually moves the printing apparatus relative to the medium, and even if the printing apparatus is shifted on the medium, the distance between the vicinity of the battery, which is the center of rotation of the printing apparatus, and the printing head is short, whereby the amount of shift of the printing head can be reduced. 
     In this case, it is preferable that the apparatus barycenter, which is the barycenter of the printing apparatus, is shifted toward the head placement section from an intermediate position between the battery housing section and the head placement section in a first direction in which the battery housing section, the head placement section, and the movement measurement section are arranged. 
     According to the configuration described above, the distance between the apparatus barycenter and the head placement section, where the printing head is placed, is shorter than the distance between the apparatus barycenter and the battery housing section, which houses the battery. Therefore, when the user manually moves the printing apparatus relative to the medium, and even if the printing apparatus is shifted on the medium, the distance between the vicinity of the apparatus barycenter, which is the center of rotation of the printing apparatus, and the printing head is short, whereby the amount of shift of the printing head can be effectively reduced. 
     The direction Y is an example of the “first direction.” 
     In this case, it is preferable that the apparatus barycenter is located in a position where the apparatus barycenter overlaps with the head placement section in the first direction. 
     According to the configuration described above, when the user manually moves the printing apparatus relative to the medium, and even if the printing apparatus is shifted on the medium, the distance between the vicinity of the apparatus barycenter, which is the center of rotation of the printing apparatus, and the printing head is very small, whereby the amount of shift of the printing head can be more effectively reduced. 
     In this case, it is preferable that the printing apparatus further includes a strap hole to which a strap is attached, and that the strap hole, the battery housing section, the head placement section, and the movement measurement section are arranged in the order of the strap hole, the battery housing section, the head placement section, and the movement measurement section. 
     According to the configuration described above, since the head placement section or the movement measurement section is not interposed between the battery housing section, which houses the battery, and the strap hole, the battery is located in a position close to the strap hole. Therefore, when the printing apparatus is hung from the user&#39;s hand via the strap attached to the strap hole, the distance between the user&#39;s hand, which serves as the center of rotation of the printing apparatus, and the battery, which is a heavy object, is short, whereby the amount of shift of the printing apparatus can be reduced. 
     In this case, it is preferable that the printing apparatus includes a first enclosure provided with the battery housing section, a second enclosure provided with a cartridge loading section into which an ink cartridge is detachably loaded, and a connection mechanism that pivotably couples the first enclosure to the second enclosure in such a way that the first enclosure blocks and unblocks the cartridge loading section, and when the first enclosure is located in a blocking position where the first enclosure blocks the cartridge loading section, a first connection distance between the connection mechanism and the battery housing section is shorter than a second connection distance between the connection mechanism and the movement measurement section in the first direction, in which the battery housing section, the head placement section, and the movement measurement section are arranged. 
     According to the configuration described above, when the user grips the second enclosure out of the first enclosure and the second enclosure, the distance between the connection mechanism, which is the center of rotation of the first enclosure hung from the second enclosure, and the battery, which is a heavy object, is short, whereby the amount of shift of the first enclosure can be reduced. 
     In this case, it is preferable that the printing apparatus includes the first housing, which is provided with the battery housing section and the cartridge loading section, into which the ink cartridge is detachably loaded, the second enclosure, and the connection mechanism, which pivotably couples the second enclosure to the first enclosure in such a way that the second enclosure blocks and unblocks the cartridge loading section, and that when the second enclosure is located in a blocking position where the second enclosure blocks the cartridge loading section, the first connection distance between the connection mechanism and the battery housing section is shorter than the second connection distance between the connection mechanism and the movement measurement section in the first direction, in which the battery housing section, the head placement section, and the movement measurement section are arranged. 
     According to the configuration described above, when the user grips the second enclosure out of the first enclosure and the second enclosure, the distance between the connection mechanism, which is the center of rotation of the first enclosure hung from the second enclosure, and the battery, which is a heavy object, is short, whereby the amount of shift of the first enclosure can be reduced. 
     In this case, it is preferable that the printing apparatus further includes a strap hole to which a strap is attached, that the strap hole is provided in the first housing, and that when the cartridge loading section is blocked, the strap hole, the battery housing section, the head placement section, and the movement measurement section are arranged in the order of the strap hole, the battery housing section, the head placement section, and the movement measurement section. 
     According to the configuration described above, since the head placement section or the movement measurement section is not interposed between the battery housing section, which houses the battery, and the strap hole, the battery is located in a position close to the strap hole. Therefore, when the printing apparatus is hung from the user&#39;s hand via the strap attached to the strap hole, the distance between the user&#39;s hand, which serves as the center of rotation of the printing apparatus, and the battery, which is a heavy object, is short, whereby the amount of shift of the printing apparatus can be reduced. 
     The printing apparatus is a printing apparatus that performs printing on a medium while being manually moved relative to the medium and includes a head placement section where a printing head that performs printing on the medium is placed and a movement measurement section that optically measures the movement of the printing apparatus relative to the medium, and when the printing apparatus is projected onto the medium in a posture in which the printing apparatus is capable of performing printing on the medium, a first barycenter distance between the apparatus barycenter, which is the barycenter of the printing apparatus, and the printing head is shorter than a second barycenter distance between the apparatus barycenter and the movement measurement section. 
     According to the configuration described above, the apparatus barycenter is located in a position close to the printing head. Therefore, when the user manually moves the printing apparatus relative to the medium, and even if the printing apparatus is shifted on the medium, the distance between the vicinity of the apparatus barycenter, which is the center of rotation of the printing apparatus, and the printing head is short, whereby the amount of shift of the printing head can be reduced.