Patent Publication Number: US-2017367467-A1

Title: Attaching loop member to mount printing device on belt-like member worn by user

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims priority from Japanese Patent Application No. 2016-127082 filed Jun. 27, 2016. The entire content of the priority application is incorporated herein by reference. 
     TECHNICAL FIELD 
     The present invention relates to an attaching loop member that is attached to a belt-like member worn by a user, and a printing device that is secured to the belt-like member by the attaching loop member. 
     BACKGROUND 
     A member for attaching a printing device to a belt-like or strip-like shaped member, such as a belt worn by a user, is well known in the art. Japanese Patent Application Publication No. H11-257319 describes a fitting-type connecting mechanism. The fitting-type connecting mechanism functions to mount a portable telephone on a belt clip attached to a belt according to the following procedure. First, a flange part on a distal end of a shaft provided on the belt clip is inserted through a large hole part of the portable telephone. Next, the portable telephone is moved downward to shift the flange part from the large hole part to a small hole part. Subsequently, the portable telephone is rotated a half turn about the shaft. This configuration secures the portable telephone so that the telephone will not become detached from the belt clip. The portable telephone can be removed from the belt clip by performing the above procedure in reverse. 
     SUMMARY 
     When using the above structure as a member for attaching a printing device, it is necessary to follow a similar procedure for rotating the printing device when attaching the device to or detaching the device from the belt, requiring a complex procedure when applied to a printing device. Further, the shaft and flange part provided on the conventional belt clip described above protrudes out from the belt clip. This outward protrusion increases the size of the belt clip and increases a potential for other objects to catch on the flange part. 
     In view of the foregoing, it is an object of the present disclosure to provide an attaching loop member that simplifies a procedure for attaching a printing device to and detaching the printing device from a belt-like member worn by a user while maintaining a small overall size and preventing other objects from getting snagged on the loop member. It is another object of the present disclosure to provide a printing device that is secured to a belt-like member through the attaching loop member. 
     In order to attain the above and other objects, the disclosure provides an attaching loop member configured to mount a printing device on a belt-like member worn by a user. The attaching loop member includes a device-side member connectable to the printing device, and an attaching-side member mountable on the belt-like member worn by the user. The device-side member includes a device-side plate portion, a fixing portion, a shaft portion, and an engaging portion. The device-side plate portion has a flat plate-like shape and has one end and another end opposite to each other. The fixing portion is provided on the device-side plate portion and is configured to be fixed to the printing device. The shaft portion is provided at the one end of the device-side member. The engaging portion is provided at the another end of the device-side plate portion. The attaching-side member is attachable to and detachable from the attaching-side member. The attaching-side member includes: a bearing portion configured to be engaged with and disengaged from the shaft portion; an engaged portion configured to be engaged with and disengaged from the engaging portion; and a retaining portion configured to retain the belt-like member. Engagement of the shaft portion with the bearing portion allows the device-side member to pivot relative to the attaching-side member in a first pivot direction and in a second pivot direction opposite the first pivot direction, the another end of the device-side plate portion moving toward the attaching-side member in the first pivot direction, the another end of the device-side plate portion moving away from the attaching-side member in the second pivot direction. Pivoting of the device-side member with the shaft portion engaged with the bearing portion in the first pivot direction brings the engaging portion into engagement with the engaged portion, while pivoting of the device-side member with the shaft portion engaged with the bearing portion in the second pivot direction causes the engaging portion to be disengaged from the engaged portion. The retaining portion provides an open region between the bearing portion and the engaged portion. The retaining portion extends in a first direction to provide the open region extending in the first direction. The open region allows the belt-like member to penetrate through the open region in the first direction. 
     According to another aspect, there is provided a printing device mountable on a belt-like member worn by a user. The printing device includes: a housing configured to accommodate print medium therein; a device-side member connectable to the housing; and an attaching-side member mountable on the belt-like member worn by the user. The device-side member includes a device-side plate portion, a fixing portion, a shaft portion and an engaging portion. The device-side plate portion has a flat plate-like shape and has one end and another end opposite to each other. The fixing portion is provided on the device-side plate portion and is configured to be fixed to the housing. The shaft portion is provided at the one end of the device-side member. The engaging portion is provided at the another end of the device-side plate portion. The attaching-side member is attachable to and detachable from the attaching-side member. The attaching-side member includes: a bearing portion configured to be engaged with and disengaged from the shaft portion; an engaged portion configured to be engaged with and disengaged from the engaging portion; and a retaining portion configured to retain the belt-like member. Engagement of the shaft portion with the bearing portion allows the device-side member to pivot relative to the attaching-side member in a first pivot direction and in a second pivot direction opposite the first pivot direction, the another end of the device-side plate portion moving toward the attaching-side member in the first pivot direction, the another end of the device-side plate portion moving away from the attaching-side member in the second pivot direction. Pivoting of the device-side member with the shaft portion engaged with the bearing portion in the first pivot direction brings the engaging portion into engagement with the engaged portion, while pivoting of the device-side member with the shaft portion engaged with the bearing portion in the second pivot direction causes the engaging portion to be disengaged from the engaged portion. The retaining portion provides an open region between the bearing portion and the engaged portion. The retaining portion extends in a first direction to provide the open region extending in the first direction. The open region allows the belt-like member to penetrate the open region in the first direction. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In the drawings: 
         FIG. 1  is a perspective view of a printing device and an attaching loop member according to an embodiment, with the loop member attached to the printing device; 
         FIG. 2  is a perspective view of the printing device and the attaching loop member according to the embodiment, with the loop member removed from the printing device; 
         FIG. 3  is a perspective view of the printing device and the attaching loop member according to the embodiment, with a device-side member removed from the printing device; 
         FIG. 4  is a perspective view of the device-side member according to the embodiment as viewed from downward and frontward; 
         FIG. 5  is a left side view of the device-side member according to the embodiment; 
         FIG. 6  is a perspective view of the device-side member according to the embodiment as viewed from downward and rearward; 
         FIG. 7  is a perspective view of an attaching-side member according to the embodiment as viewed from downward and frontward; 
         FIG. 8  is a perspective view of the attaching-side member according to the embodiment as viewed from downward and rightward; 
         FIG. 9  is a left side view of the attaching-side member according to the embodiment; 
         FIG. 10  is a left side view illustrating attachment of the device-side member to the attaching-side member according to the embodiment; 
         FIG. 11  is a left side view of the attaching loop member according to the embodiment in a first engaged state; 
         FIG. 12  a left side view of the attaching loop member according to the embodiment in a second engaged state; 
         FIG. 13  is a perspective view of the attaching loop member according to the embodiment in the second engaged state as viewed from downward and frontward; 
         FIG. 14  a perspective view of the attaching loop member according to the embodiment in the second engaged state as viewed from rearward and rightward; 
         FIG. 15  is a perspective view of an attaching-side member according to a modification to the embodiment; 
         FIG. 16  is a left side view of the attaching-side member according to the modification to the embodiment; 
         FIG. 17  is a perspective view of an attaching loop member according to the modification to the embodiment in its second engaged state; and 
         FIG. 18  is a left side view of the attaching loop member according to the modification to the embodiment in its second engaged state. 
     
    
    
     DETAILED DESCRIPTION 
     1. Embodiment 
     Hereinafter, an embodiment of the present disclosure will be described while referring to the accompanying drawings. To facilitate the following description, directions related to a printing device  2  and an attaching loop member  3  according to the embodiment are defined as follows. The upper, lower, upper left, lower right, lower left and upper right sides in  FIG. 1  will be respectively defined as upper, lower, front, rear, left, and right sides of the printing device  2  and attaching loop member  3 . 
     &lt;Printing Device  2 &gt; 
     The printing device  2  is a portable device that is capable of printing letters, graphic characters, symbols, and other characters on thermal paper (printing medium in the embodiment). The printing device  2  is configured to execute printing operations on thermal paper based on data received from a personal computer (not shown) via a USB (registered trademark) cable, for example. As shown in  FIGS. 1 through 3 , the printing device  2  has a housing  20 . The housing  20  includes a first casing  20 A, a second casing  20 B, a protective plate  201 , and a cover  20 C. The first casing  20 A constitutes a top surface of the housing  20 , both left and right side surfaces, and an approximate upper half portion of a front surface of the housing  20 . The second casing  20 B constitutes a rear surface of the housing  20 , and an approximate rearward half portion of a bottom surface of the housing  20 . The protective plate  201  is a flat plate member connected to a rear surface of the second casing  20 B. The cover  20 C constitutes an approximate lower half portion of the front surface of the housing  20 , and an approximate forward half portion of the bottom surface. 
     As shown in  FIGS. 2 and 3 , a recessed portion  23  is formed in an upper end portion of the second casing  20 B. The recessed portion  23  is recessed toward the front. Screw holes  23 A are formed in the recessed portion  23 . The attaching loop member  3  described later is fixed in the recessed portion  23 . Note that the printing device  2  can also be used when the attaching loop member  3  is not fixed in the recessed portion  23 , i.e., when the attaching loop member  3  has been removed. 
     The cover  20 C is pivotably supported on a bottom edge of the second casing  20 B. The cover  20 C opens and closes an accommodating section when pivoted. The accommodating section is provided in an approximate lower half portion of the interior of the housing  20 . A roll of thermal paper (not shown) is accommodated in the accommodating section. A discharge opening (not shown) is formed between a bottom edge on the front surface of the first casing  20 A and a top edge of the cover  20 C when the cover  20 C is in its closed position over the accommodating section. The discharge opening is a slit elongated in a left-right direction. While not shown in the drawings, a thermal head, a platen roller, and cutting teeth are provided on the inside of the discharge opening. The discharge opening allows thermal paper to be discharged from the printing device  2  after being printed by the thermal head and platen roller. 
     &lt;Attaching Loop Member  3 &gt; 
     The attaching loop member  3  is used when the user wishes to operate the printing device  2  described above while the printing device  2  is hanging from a belt-like member worn by the user. Here, the belt-like member worn the user may include a belt worn about the user&#39;s waist, a band or a strip-shaped member worn by the user, for example. In the present embodiment, the attaching loop member  3  is used to mount the printing device  2  on a belt  1 B worn by the user (see  FIGS. 10-12 ). 
     As shown in  FIGS. 1 and 2 , the attaching loop member  3  includes a device-side member  5 , and an attaching-side member  6 . The device-side member  5  is connectable to the printing device  2 . The attaching-side member  6  is mountable on the belt  1 B worn by the user. The device-side member  5  and attaching-side member  6  are configured to pivot relative to each other. The device-side member  5  and attaching-side member  6  are formed of a synthetic resin material, for example. The attaching-side member  6  is detachably mountable on the device-side member  5 .  FIG. 3  shows the device-side member  5  when the attaching-side member  6  has been removed. 
     &lt;Device-side Member  5 &gt; 
     As shown in  FIGS. 2 and 3 , the device-side member  5  is fixed to the recessed portion  23  of the printing device  2 . As shown in  FIGS. 4 through 6 , the device-side member  5  includes a device-side plate portion  51 , a fixing portion  53 , shaft support portions  54 , a shaft portion  55 , an engaging portion  57 , and a rib  58 . 
     The device-side plate portion  51  has a flat plate shape. The device-side plate portion  51  includes a first section  511 , and a second section  512 . The first section  511  of the device-side plate portion  51  has a rectangular shape that is elongated vertically. The second section  512  of the device-side plate portion  51  is connected to a top edge of the first section  511 . The second section  512  of the device-side plate portion  51  has a rectangular shape that is elongated in the left-right direction. Left and right edges of the second section  512  of the device-side plate portion  51  protrude farther outward than corresponding left and right edges of the first section  511  of the device-side plate portion  51  with respect to the left-right direction. 
     As shown in  FIG. 6 , two holes  51 A are formed in an upper end portion of the first section  511  of the device-side plate portion  51  near respective left and right corners. Each hole  51 A is a circular through-hole that penetrates the upper end portion of the first section  511  of the device-side plate portion  51  in a front-rear direction. A screw  230  (see  FIGS. 2 and 3 ) is inserted through each hole  51 A from a rear side thereof. 
     Hereinafter, referring to  FIG. 6 , L 11  denotes a left-right dimension of the first section  511  and L 21  denotes a vertical dimension of the first section  511  of the device-side plate portion  51 . Further, L 12  denotes a left-right dimension of the second section  512  and L 22  denotes a vertical dimension of the second section  512  of the device-side plate portion  51 . The left-right dimension L 12  of the second section  512  of the device-side plate portion  51  is greater than the left-right dimension L 11  of the first section  511  of the device-side plate portion  51 . The vertical dimension L 21  of the first section  511  of the device-side plate portion  51  is greater than the vertical dimension L 22  of the second section  512  of the device-side plate portion  51 . The sum of the vertical dimensions of the first section  511  and second section  512  constituting the device-side member  5  will be called a “vertical dimension L 2  of the device-side member  5 ”. 
     As shown in  FIGS. 4 and 5 , the fixing portion  53  is provided on an upper portion of the front surface of the first section  511  and the front surface of the second section  512  constituting the device-side plate portion  51 . The fixing portion  53  has a box-like shape and protrudes forward from the front surface of the device-side plate portion  51 . A bottom end portion constituting the front surface of the fixing portion  53  is shaped to fit in the recessed portion  23  of the printing device  2  (see  FIGS. 2 and 3 ). As shown in  FIG. 4 , two holes  53 A are formed in the bottom end portion on the front surface of the fixing portion  53  near left and right corners thereof. The holes  53 A are circular through-holes that penetrate the bottom end portion constituting the front surface of the fixing portion  53  in the front-rear direction. The screws  230  (see  FIGS. 2 and 3 ) passing through the holes  51 A formed in the device-side plate portion  51  (see  FIG. 6 ) are inserted through the corresponding holes  53 A from the rear side toward the front side thereof. 
     As shown in  FIG. 6 , the shaft support portions  54  are configured of a shaft support part  541  and a shaft support part  542 . The shaft support part  541  is disposed in an upper-left corner of the second section  512  constituting the device-side plate portion  51 , while the shaft support part  542  is disposed in an upper-right corner of the second section  512 . The shaft support parts  541  and  542  are collectively referred to as the shaft support portions  54 . The shaft support portions  54  have a bar-like shape. The shaft support portions  54  protrude rearward from the rear surface of the second section  512 . The shaft support parts  541  and  542  define a distance therebetween that is slightly greater than the left-right dimension L 11  of the first section  511 . More specifically, the distance between inner left-right sides of the shaft support parts  541  and  542  is slightly greater than the left-right dimension L 11  of the first section  511 . 
     The shaft portion  55  has a circular columnar shape. The shaft portion  55  is disposed at and along a top edge portion of the second section  512  of the device-side plate portion  51 . The shaft portion  55  is elongated in the left-right direction. The shaft portion  55  has a left end that is supported by the shaft support part  541 , and a right end that is supported by the shaft support part  542 . The shaft portion  55  extends parallel to the device-side plate portion  51  to connect rear ends of the shaft support parts  541  and  542 . The shaft portion  55  has a left-right dimension that is substantially equivalent to the left-right dimension of the second section  512 . That is, the left-right dimension of the shaft portion  55  is L 12 . As shown in  FIG. 5 , the shaft portion  55  is separated from the device-side plate portion  51  to the rear by a prescribed gap L 31 . The shaft portion  55  has a diameter R 11 , as shown in  FIG. 5 . 
     As shown in  FIG. 4 , the engaging portion  57  is disposed on a bottom edge of the first section  511 . The engaging portion  57  curves rearward while extending downward from the bottom edge of the first section  511 . That is, the engaging portion  57  has an arcuate shape in a side view, as shown in  FIG. 5 . The engaging portion  57  has flexibility. In the following description, the side of the engaging portion  57  facing a center of curvature of its arcuate shape will be called an “inner side of the engaging portion  57 ”, while the side opposite the center of curvature will be called an “outer side of the engaging portion  57 ”. As shown in  FIG. 5 , the inner side of the engaging portion  57  has a radius of curvature R 12  (hereinafter called a “radius of curvature of the engaging portion  57 ”). The engaging portion  57  includes a protruding part  571  provided on an edge of the engaging portion  57  opposite the first section  511  (hereinafter called a “distal edge of the engaging portion  57 ”). The protruding part  571  extends along the distal edge in the left-right direction. The protruding part  571  protrudes outward from an outer surface of the engaging portion  57 . 
     As shown in  FIG. 6 , the rib  58  is disposed on the rear surface of the second section  512  along a bottom edge thereof. The rib  58  protrudes rearward from the rear surface of the second section  512 . The rib  58  is elongated in the left-right direction and has a square column shape. The rib  58  has a left-right dimension that is substantially equivalent to the left-right dimension of the first section  511 . That is, the left-right dimension of the rib  58  is L 11 . As shown in  FIG. 5 , the rib  58  has a vertical dimension L 23 . 
     &lt;Attaching-side Member  6 &gt; 
     The attaching-side member  6  is attachable to and detachable from the device-side member  5  fixed to the printing device  2 . Specifically, as shown in  FIGS. 1 and 2 , the attaching-side member  6  can be pivotably supported on the device-side member  5 . As shown in  FIGS. 7 through 9 , the attaching-side member  6  has an attaching-side plate portion  6 A. The attaching-side plate portion  6 A has a curved plate shape. The attaching-side plate portion  6 A includes a base portion  60 , a first segment portion  61 , a second segment portion  62 , a first curved portion  63 , and a second curved portion  64 . 
     Each of the base portion  60 , first segment portion  61 , and second segment portion  62  has a flat plate shape. The base portion  60 , first segment portion  61 , and second segment portion  62  extend orthogonal to the front-rear direction, respectively. The base portion  60  and second segment portion  62  have a rectangular shape that is elongated vertically. The first segment portion  61  has a rectangular shape that is elongated in the left-right direction. The first segment portion  61  and second segment portion  62  are arranged frontward of the base portion  60  and spaced apart from the base portion  60  by a prescribed distance. The first curved portion  63  connects respective top edges of the base portion  60  and first segment portion  61 . The second curved portion  64  connects respective bottom edges of the base portion  60  and second segment portion  62 . The first curved portion  63  and second curved portion  64  are curved in a general U-shape in a side view. The first curved portion  63  expands above the top edges of the base portion  60  and first segment portion  61 . The second curved portion  64  expands below the bottom edges of the base portion  60  and second segment portion  62 . In the following description, the sides of the first curved portion  63  and second curved portion  64  facing toward centers of curvature of their respective arcuate shapes will be called an “inner side of the first curved portion  63 ” and an “inner side of the second curved portion  64 ”, respectively, while the sides opposite their centers of curvature will be called an “outer side of the first curved portion  63 ” and an “outer side of the second curved portion  64 ”, respectively. The first curved portion  63  and second curved portion  64  are both resiliently deformable. 
     The first curved portion  63  has an inner surface facing the inner side of the first curved portion  63 . Hereinafter, the inner surface of the first curved portion  63  will be called a “bearing portion  63 A”, since this inner surface of the first curved portion  63  (bearing portion  63 A) provides a space for receiving the shaft portion  55  of the device-side member  5  therein when the device-side member  5  is attached to the attaching-side member  6 . Further, an outer surface of the second curved portion  64  will be called an “engaged part  64 A”. Further, in the attaching-side plate portion  6 A, a space covered by the base portion  60 , first segment portion  61 , and second segment portion  62  will be called an “open region  60 A”. In other words, the base portion  60 , first segment portion  61  and second segment portion  62  constitute a portion for retaining the belt  1 B and provide the open region  60 A through which the belt  1 B penetrates. The open region  60 A is a space positioned frontward of the base portion  60  and rearward of the first segment portion  61  and second segment portion  62 . That is, the open region  60 A is a space penetrating the attaching-side plate portion  6 A in the left-right direction. The open region  60 A extends between the bearing portion  63 A and the engaged part  64 A in a vertical direction. The bearing portion  63 A and the open region  60 A are aligned vertically. The open region  60 A is in communication with the space provided by the bearing portion  63 A (inner surface of the first curved portion  63 ). The space provided by the bearing portion  63 A and the open region  60 A together provide a continuous space through which the belt  1 B worn by the user penetrates, as shown in  FIGS. 10 to 12 . 
     As shown in  FIG. 7 , the attaching-side plate portion  6 A (the base portion  60 , first segment portion  61 , and second segment portion  62 ) has a left-right dimension L 11  that is equivalent to the left-right dimension of the first section  511  of the device-side member  5  (see  FIG. 6 ). The base portion  60  has a vertical dimension L 2  that is substantially equal to the vertical dimension of the device-side member  5  (see  FIG. 6 ). The second segment portion  62  has a vertical dimension L 21  that is substantially equivalent to the vertical dimension of the first section  511  of the device-side member  5  (see  FIG. 6 ). The first segment portion  61  has a vertical dimension L 24  that is shorter than the vertical dimension L 21  of the second segment portion  62 . 
     As shown in  FIG. 9 , the open region  60 A in the attaching-side plate portion  6 A has a width L 32 . That is, the width L 32  is a gap defined between the first segment portion  61  and the base portion  60  and between the second segment portion  62  and the base portion  60 . The width L 32  is slightly greater than the diameter R 11  of the shaft portion  55  of the device-side member  5  (see  FIG. 5 ). The attaching-side plate portion  6 A has a thickness that is uniform at the base portion  60 , first segment portion  61 , and second segment portion  62 . Hereinafter, this thickness of the attaching-side plate portion  6 A will be called a “thickness L 33 ”. The thickness L 33  is slightly smaller than the gap L 31  between the second section  512  of the device-side plate portion  51  and the shaft portion  55  (see  FIG. 5 ). A radius of curvature for the inner surface of the first curved portion  63  (hereinafter called a “radius of curvature of the bearing portion  63 A”) and a radius of curvature for an inner surface of the second curved portion  64  are both substantially equivalent to the radius of the shaft portion  55  in the device-side member  5  (see  FIG. 5 ; R 11 / 2 ). Further, a radius of curvature for the outer surface of the second curved portion  64  (hereinafter called a “radius of curvature of the engaged part  64 A”) and a radius of curvature for an outer surface of the first curved portion  63  are both substantially equivalent to the radius of curvature R 12  of the engaging portion  57  of the device-side member  5  (see  FIG. 5 ). 
     As shown in  FIG. 7 , a gap is formed between the bottom edge of the first segment portion  61  and the top edge of the second segment portion  62 . This gap will be referred to as a slit  65  formed in the attaching-side plate portion  6 A in the embodiment. That is, the slit  65  is elongated in the left-right direction to be open on left and right edges of the attaching-side plate portion  6 A. The slit  65  has a left-right dimension that is substantially equivalent to the left-right dimension L 11  of the attaching-side plate portion  6 A. The slit  65  has a width L 23  that is substantially equivalent to the vertical length of the rib  58  of the device-side member  5  (see  FIG. 5 ). Specifically, the width L 23  of the slit  65  is a vertical distance between the bottom edge of the first segment portion  61  and the top edge of the second segment portion  62 . The width L 23  of the slit  65  is slightly greater than the diameter R 11  of the shaft portion  55  (see  FIG. 5 ). A sum of the vertical dimension L 23  of the slit  65  and the vertical dimension L 24  of the first segment portion  61  is substantially equivalent to the vertical dimension L 22  of the second section  512  constituting the device-side plate portion  51  of the device-side member  5  (see  FIG. 6 ). 
     As shown in  FIG. 9 , a protrusion  66 A is provided on the top edge of the base portion  60 , and a protrusion  66 B is provided on the top edge of the first segment portion  61 . The protrusion  66 A protrudes forward, and the protrusion  66 B protrudes rearward. The protrusion  66 A and  66 B oppose each other in the front-rear direction. Collectively, the protrusion  66 A and  66 B will be referred to as “protrusions  66 ”, hereinafter. The protrusions  66  are formed by bending portions of the attaching-side plate portion  6 A into the open region  60 A. The protrusions  66  are provided in proximity to a bottom of the bearing portion  63 A. The width of the open region  60 A in the attaching-side plate portion  6 A, more specifically, the gap between the base portion  60  and first segment portion  61 , is slightly smaller than the width L 32  in a region that the protrusions  66  are disposed. More specifically, the gap between the base portion  60  and first segment portion  61  in the region that the protrusions  66  are disposed is slightly smaller than the diameter R 11  of the shaft portion  55  constituting the device-side member  5  (see  FIG. 5 ). Hereinafter, the gap (width) of the open region  60 A in the region at which the protrusion  66 A and  66 B are disposed will be referred to as a “gap between the protrusions  66 A and  66 B.” 
     &lt;How To Use the Attaching Loop Member  3 &gt; 
     Initially, the device-side member  5  and attaching-side member  6  of the attaching loop member  3  are separated from each other. Hereinafter, this state will be called a “separated state” of the attaching loop member  3 . The belt  1 B (see  FIGS. 10 through 12 ) is inserted through the open region  60 A formed in the attaching-side plate portion  6 A of the attaching-side member  6  in the left-right direction along which the open region  60 A extends. Note that, generally, the belt  1 B has a width that is smaller than the vertical dimension L 21  of the second segment portion  62  constituting the attaching-side plate portion  6 A (see  FIG. 7 ). Hence, after being inserted through the open region  60 A, the belt  1 B can move vertically within the open region  60 A. 
     In the meantime, as shown in  FIG. 3 , the device-side member  5  is fixed to the recessed portion  23  of the printing device  2  as follows. The two screws  230  are inserted from the rear side through the two holes  51 A of the device-side plate portion  51  and the two holes  53 A of the fixing portion  53  (see  FIG. 4 ). The screws  230  are then screwed into the corresponding screw holes  23 A of the recessed portion  23 . While the device-side member  5  is fixed to the printing device  2 , the approximate upper half portion of the device-side member  5  protrudes above the upper end of the printing device  2 . 
     Then, the user places the device-side member  5  frontward of the attaching-side member  6  mounted on the belt  1 B, and adjusts the device-side member  5  such that the device-side plate portion  51  is sloped relative to the front-rear direction. Specifically, an angle that the device-side member  5  forms with the attaching-side member  6  is adjusted so that the surface of the device-side plate portion  51  on which the fixing portion  53  is provided (i.e., front surface of the device-side plate portion  51 ) faces diagonally upward and forward (see  FIG. 10 ). The device-side member  5  is thus positioned so that the shaft portion  55  is disposed in front of the slit  65  of the attaching-side member  6 . Further, the belt  1 B is arranged in the open region  60 A so as to be lower than the slit  65 . 
     As shown in  FIG. 10 , the device-side member  5  is then moved rearward relative to the attaching-side member  6  (in a direction shown by an arrow Y 1 ). The shaft portion  55  of the device-side member  5  is inserted through the slit  65  of the attaching-side member  6  from the front side thereof, thereby inserting the shaft portion  55  into the open region  60 A of the attaching-side member  6 . Note that the printing device  2  fixed to the device-side member  5  is not shown in  FIGS. 10 through 14 . As described earlier, the width L 23  of the slit  65  (see  FIG. 7 ) is slightly greater than the diameter R 11  of the shaft portion  55  (see  FIG. 5 ). In other words, the slit  65  has a sufficient width to allow passage of the shaft portion  55 . Hence, when performing the above process, the slit  65  does not hinder insertion of the shaft portion  55  into the open region  60 A. Further, since the belt  1 B is disposed lower than the slit  65 , the belt  1 B does not hinder insertion of the shaft portion  55  into the open region  60 A, either. 
     Next, the user applies force to the device-side member  5  in an upward direction indicated by an arrow Y 2  in  FIG. 11 . Consequently, the shaft portion  55  of the device-side member  5  moves upward within the open region  60 A of the attaching-side member  6 . As described above, the width L 32  of the open region  60 A (see  FIG. 9 ) is slightly larger than the diameter R 11  of the shaft portion  55  (see  FIG. 5 ). In other words, the gap between the base portion  60  and first segment portion  61  is sufficiently large for allowing passage of the shaft portion  55 . Hence, the base portion  60  and first segment portion  61  do not hinder movement of the shaft portion  55  along the open region  60 A. 
     In the process of moving the shaft portion  55  upward along the open region  60 A, the first segment portion  61  of the attaching-side member  6  moves downward relative to the shaft portion  55 . Here, the gap L 31  between the second section  512  of the device-side plate portion  51  and the shaft portion  55  (see  FIG. 5 ) is slightly larger than the thickness L 33  of the first segment portion  61  of the attaching-side member  6  (see  FIG. 9 ). Further, the distance between the inner surfaces (right and left surfaces) of the shaft support parts  541  and  542  that support the shaft portion  55  is slightly greater than the left-right dimension L 11  of the attaching-side plate portion  6 A constituting the attaching-side member  6  (see  FIGS. 6 and 7 ). Hence, as the shaft portion  55  moves upward through the open region  60 A, the first segment portion  61  moves relatively downward so as to pass between the second section  512  of the device-side plate portion  51  and the shaft portion  55  and between the shaft support parts  541  and  542 . 
     The width of the open region  60 A at the region in which the protrusions  66  are disposed is slightly smaller than the diameter R 11  of the shaft portion  55  in the device-side member  5 . Hence, when the shaft portion  55  moves upward along the open region  60 A, the shaft portion  55  contacts the protrusions  66  from below. The protrusions  66  restrict further upward movement of the shaft portion  55 . 
     As the operator applies more force to the device-side member  5  in the upward direction, forces are applied to the protrusions  66  in outwardly directions as the shaft portion  55  moves upward. In response to the forces applied by the shaft portion  55  to the protrusions  66 , the first curved portion  63  resiliently deforms so as to expand the gap between the protrusions  66 A and  66 B. The gap between the base portion  60  and first segment portion  61  expands until the shaft portion  55  can pass therethrough. Consequently, the shaft portion  55  moves from below to above the protrusions  66 . As shown in  FIG. 11 , the shaft portion  55  moves to the bearing portion  63 A of the attaching-side member  6 . When the shaft portion  55  has moved into the bearing portion  63 A, the protrusions  66  no longer receive force from the shaft portion  55 . Thus, the resiliently deformed first curved portion  63  returns to its original shape, thereby engaging the shaft portion  55  in the bearing portion  63 A. Since the width of the open region  60 A in the region at which the protrusions  66  are disposed is slightly smaller than the diameter R 11  of the shaft portion  55 , the shaft portion  55  is retained in the bearing portion  63 A. In other words, the shaft portion  55  is restricted from moving downward past the protrusions  66 . 
     The shaft portion  55  is oriented in the left-right direction when retained in the bearing portion  63 A. As described above, the radius of the shaft portion  55  (R 11 / 2 ) is approximately equal to the radius of curvature of the bearing portion  63 A. Hence, the bearing portion  63 A can rotatably support the shaft portion  55 . Hereinafter, a state in which the shaft portion  55  is rotatably supported in the bearing portion  63 A and prior to the engaging portion  57  being engaged with the engaged part  64 A (i.e., a state of the attaching loop member  3  shown in  FIG. 11 ) will be called a “first engaged state.” 
     In the first engaged state, the user then pivotally moves device-side member  5  about the shaft portion  55  relative to the attaching-side member  6 . Specifically, the device-side member  5  is pivoted in a direction that moves the engaging portion  57  toward the attaching-side member  6  (hereinafter called an “engaging direction”, indicated by an arrow Y 3  in  FIG. 12 ). As the device-side member  5  is pivoted, the distal end of the engaging portion  57  is brought into contact with the engaged part  64 A of the attaching-side member  6 . The user continues to apply force to the device-side member  5  for pivoting the device-side member  5  in the engaging direction Y 3 . Consequently, the engaged part  64 A applies a force to the engaging portion  57  for increasing the radius of curvature of the engaging portion  57 . As described above, the engaging portion  57  is resiliently deformable and thus has flexibility. Therefore, the engaging portion  57  resiliently deforms, increasing its radius of curvature to be larger than the R 12 . The device-side member  5  is pivoted until the rear surface of the device-side plate portion  51  contacts the front surfaces of the first segment portion  61  and second segment portion  62  constituting the attaching-side member  6 . At this time, the inner surface of the engaging portion  57  is in contact with the engaged part  64 A. 
     After the inner surface of the engaging portion  57  contacts the engaged part  64 A, the resiliently deformed engaging portion  57  returns to its original state, and the radius of curvature of the engaging portion  57  returns to the original R 12 . Note that the radius of curvature R 12  of the engaged part  64 A is approximately equal to the radius of curvature of the engaging portion  57 . Therefore, the engaging portion  57  contacts and engages the engaged part  64 A from outward thereof, as illustrated in  FIGS. 12 through 14 . The inner surface of the engaging portion  57  is in close contact with the engaged part  64 A (i.e., the outer surface of the second curved portion  64 ). Hereinafter, a state in which the engaging portion  57  is engaged with the engaged part  64 A (i.e., a state of the attaching loop member  3  shown in  FIGS. 12 to 14 ) will be called a “second engaged state”. 
     During the process of shifting the attaching loop member  3  from the first engaged state to the second engaged state, the rib  58  of the device-side member  5  is fitted into the slit  65  of the attaching-side member  6 . Since the width of the slit  65  is L 23 , which is substantially equivalent to the vertical dimension of the rib  58  (see  FIGS. 5 and 7 ), the rib  58  closes the slit  65 . Hence, if the belt  1 B were to move upward along the open region  60 A of the attaching-side member  6 , as illustrated in  FIG. 12 , for example, the rib  58  suppresses the belt  1 B from coming out of the open region  60 A through the slit  65 . 
     When the attaching loop member  3  is in the second engaged state, the printing device  2  is retained on the belt  1 B. Any downward force applied to the printing device  2  and device-side member  5  (for example, the weight of the printing device  2  and device-side member  5  themselves) is applied to the bearing portion  63 A supporting the shaft portion  55  and the slit  65  supporting the rib  58  from below. As described above, the slit  65  is formed by the bottom edge of the first segment portion  61  and top edge of the second segment portion  62 . Therefore, the rib  58  is supported from below by the top edge of the second segment portion  62 . However, for simplifying description, the following description assumes that the rib  58  is supported by the slit  65 . Hence, the printing device  2  and device-side member  5  are retained on the belt  1 B while being supported by the bearing portion  63 A and slit  65  of the attaching-side member  6 . 
     Since the engaging portion  57  is engaged with the engaged part  64 A in the second engaged state, as shown in  FIGS. 13 and 14 , this engagement restricts movement of the device-side member  5  in a direction opposite the engaging direction Y 3  (hereinafter called a “separating direction”, indicated by an arrow Y 4  in  FIG. 12 ). That is, the engagement between the engaging portion  57  and engaged part  64 A restricts the device-side member  5  from pivotally moving in the separating direction Y 4  in which the engaging portion  57  moves away from the engaged part  64 A. Accordingly, the attaching loop member  3  is firmly held in the second engaged state and is restricted from returning to the first engaged state. Therefore, the printing device  2  fixed to the device-side member  5  can be firmly held on the belt  1 B through the attaching-side member  6 . 
     Next, an example will be given in which the printing device  2  and attaching loop member  3  are moved downward relative to the belt  1 B by a downward force. Here, the open region  60 A and bearing portion  63 A are arranged to be aligned with each other in the vertical direction. Accordingly, the belt  1 B moves smoothly upward relative to the attaching loop member  3 . Through this relative movement, a top edge of the belt  1 B comes into contact with the shaft portion  55  supported in the bearing portion  63 A from below, as illustrated in  FIG. 12 . In this state, the belt  1 B restricts downward movement of the shaft portion  55 , thereby suppressing the shaft portion  55  from coming out of the bearing portion  63 A. 
     Next, how to separate the printing device  2  from the belt  1 B will be described. To do this, the user first applies force to the protruding part  571  to flex the engaging portion  57  outward until the radius of curvature of the engaging portion  57  is greater than the R 12 . The engaging portion  57  therefore resiliently deforms so that its radius of curvature becomes larger than the R 12 . Next, the user pivots the device-side member  5  in the separating direction, thereby separating the engaging portion  57  from the engaged part  64 A. Subsequently, the user releases the force applied to the engaging portion  57 , allowing the resiliently deformed engaging portion  57  to return to its original state. Through this operation, the attaching loop member  3  is shifted from the second engaged state (see  FIGS. 12 through 14 ) to its first engaged state (see  FIG. 11 ). 
     Next, the user moves the device-side member  5  downward relative to the attaching-side member  6 . The first curved portion  63  resiliently deforms, allowing the shaft portion  55  to pass between the protrusions  66 A and  66 B. The shaft portion  55  moves along the open region  60 A to the slit  65  (see  FIG. 10 ). Next, the user pulls the device-side member  5  forward so that the shaft portion  55  moves out of the open region  60 A through the slit  65 . Through this operation, the attaching loop member  3  changes from the first engaged state to the separated state, thereby separating the printing device  2  from the belt  1 B. 
     &lt;Operational and Technical Advantages&gt; 
     As described above, the user can attach the printing device  2  to the belt  1 B through the attaching loop member  3  by moving the attaching loop member  3  from the separated state to the second engaged state via the first engaged state. Further, the user can separate the printing device  2  from the belt  1 B by moving the attaching loop member  3  in the second engaged state to the separated state through the first engaged state. In this way, the device-side member  5  and attaching-side member  6  of the attaching loop member  3  can be mounted and removed through a simple procedure. Hence, the user can easily perform an operation for attaching the printing device  2  to the belt  1 B. 
     The structure of the attaching loop member  3  that allows mounting and removal of the device-side member  5  is achieved by configuring the attaching-side member  6  only to have a simple structure configured of the attaching-side plate portion  6 A (base portion  60 , first segment portion  61 , second segment portion  62 , first curved portion  63 , and second curved portion  64 ), the bearing portion  63 A, the engaged part  64 A, and the open region  60 A. Further, since the open region  60 A and bearing portion  63 A are aligned in the vertical direction, the structure of the attaching-side member  6  can be simplified. This configuration can prevent other objects from catching on part of the attaching-side member  6  when the user performs an operation after removing the printing device  2  and device-side member  5  from the attaching-side member  6  while leaving only the attaching-side member  6  attached to the belt  1 B, for example. 
     When the attaching loop member  3  is shifted from the first engaged state to the second engaged state, the engaging portion  57  resiliently deforms to engage the engaged part  64 A. Further, the radius of curvature of the engaging portion  57  constituting the device-side member  5  is substantially equal to the radius of curvature of the engaged part  64 A constituting the attaching-side member  6 . Accordingly, the inner surface of the engaging portion  57  can closely contact the engaged part  64 A when the engaging portion  57  becomes engaged with the engaged part  64 A. Thus, the structure of the attaching loop member  3  enables the engaging portion  57  to be firmly engaged with the engaged part  64 A. 
     The slit  65  is formed between the bottom edge of the first segment portion  61  and the top edge of the second segment portion  62 . The width L 23  of the slit  65  is substantially equal to the vertical dimension of the rib  58  constituting the device-side member  5 . The width L 23  of the slit  65  is slightly larger than the diameter R 11  of the shaft portion  55 . Hence, when the attaching loop member  3  is shifted from its separated state to its first engaged state, the shaft portion  55  can be inserted into the open region  60 A through the slit  65 . Further, the width L 32  of the open region  60 A constituting the attaching-side plate portion  6 A is slightly larger than the diameter R 11  of the shaft portion  55  constituting the device-side member  5 . Hence, when the attaching loop member  3  is shifted from the separated state to the first engaged state, the shaft portion  55  can move along the open region  60 A to pass a region between the base portion  60  and first segment portion  61  in order to reach the bearing portion  63 A. 
     The gap L 31  between the second section  512  of the device-side plate portion  51  and the shaft portion  55  is slightly larger than the thickness L 33  of the first segment portion  61  constituting the attaching-side member  6 . Further, the distance between the inner surfaces (right and left surfaces) of the shaft support parts  541  and  542  that support the shaft portion  55  is slightly greater than the left-right dimension L 11  of the attaching-side plate portion  6 A constituting the attaching-side member  6 . Hence, when the attaching loop member  3  is shifted from the separated state to the first engaged state, the first segment portion  61  can pass between the second section  512  of the device-side plate portion  51  and the shaft portion  55  and between the shaft support parts  541  and  542  as the shaft portion  55  moves upward through the open region  60 A of the attaching-side member  6 . 
     The rib  58  is disposed on the rear surface of the device-side plate portion  51 . The rib  58  is fitted into the slit  65  of the attaching-side member  6  when the attaching loop member  3  is shifted from the first engaged state to the second engaged state. Consequently, when the attaching loop member  3  is in the second engaged state, the printing device  2  and device-side member  5  are supported not only by the bearing portion  63 A receiving the shaft portion  55 , but also by the slit  65  fitted around the rib  58 . Accordingly, the slit  65  can reduce downward load that the bearing portion  63 A receives through the shaft portion  55 . Hence, the attaching loop member  3  can restrain the shaft portion  55  from coming out of the bearing portion  63 A by a downward load applied to the printing device  2  and device-side member  5 . 
     The protrusions  66  are provided on the top edges of the base portion  60  and first segment portion  61 . The width of the open region  60 A in the attaching-side plate portion  6 A in the region that the protrusions  66  are disposed is slightly smaller than the diameter R 11  of the shaft portion  55 . When the attaching loop member  3  shifts from the separated state to the first engaged state, the first curved portion  63  resiliently deforms so as to widen the gap between the protrusions  66 A and  66 B. After the shaft portion  55  passes from the bottom side of the protrusions  66  to the top side thereof, the resiliently deformed first curved portion  63  returns to its original state. In this state, the bearing portion  63 A retains the shaft portion  55 , and the protrusions  66  restrain the shaft portion  55  from moving downward. Thus, the protrusions  66  can suppress the shaft portion  55  from coming out of the bearing portion  63 A while the attaching loop member  3  is in the first engaged state. Further, the resilient deformation of the first curved portion  63  enables the shaft portion  55  to be reliably engaged in the bearing portion  63 A. 
     The vertical dimension L 21  of the second segment portion  62  is greater than the vertical dimension L 24  of the first segment portion  61 , as shown in  FIG. 6 . In other words, the dimensions of the second segment portion  62  and first segment portion  61  can be adjusted in the attaching loop member  3  so that the vertical dimension L 21  of the second segment portion  62  is larger than other portions. This arrangement enables the belt  1 B inserted through the open region  60 A to be more easily positioned near the second segment portion  62  in the vertical direction such that the top edge of the belt  1 B is located below the slit  65 . Therefore, the shaft portion  55  can pass through the slit  65  while the belt  1 B is inserted in the open region  60 A. Accordingly, the printing device  2  fixed to the device-side member  5  can be attached to and detached from the attaching-side member  6  when the attaching-side member  6  is mounted on the belt  1 B. 
     In the attaching loop member  3  of the embodiment, the space provided by the bearing portion  63 A of the attaching-side member  6  is in communication with the open region  60 A to form a continuous space in the attaching-side plate part  6 A. Hence, if the belt  1 B moves upward relative to the attaching loop member  3  due to a downward force applied to the printing device  2  and attaching loop member  3 , the top edge of the belt  1 B will contact the bottom of the shaft portion  55  supported by the bearing portion  63 A of the attaching-side member  6 , thereby restricting the shaft portion  55  from moving downward. Hence, the belt  1 B can restrict the shaft portion  55  from coming out of the bearing portion  63 A. 
     2. Modification to the Embodiment 
     Next, an attaching loop member  3 M according a modification to the embodiment will be described with reference to  FIGS. 15 through 18 . 
     The attaching loop member  3 M according to the modification includes the device-side member  5 , and an attaching-side member  7  instead of attaching-side member  6 . 
     The attaching-side member  7  of the modification differs from the attaching-side member  6  of the embodiment in that the attaching-side member  7  is provided with a first curved portion  73  and protrusions  76  in place of the first curved portion  63  and protrusions  66 . The remaining structure of the attaching-side member  7  is identical to the attaching-side member  6  described above. The following description focuses on the differences from the attaching-side member  6  rather than the similar parts. 
     More specifically, referring to  FIG. 15 , the attaching-side member  7  has an attaching-side plate portion  7 A. The attaching-side plate portion  7 A includes a base portion  70 , a first segment portion  71 , a second segment portion  72 , a slit  75 , and a second curved portion  74  (engaged part  74 A) which correspond to the base portion  60 , first segment portion  61 , second segment portion  62 , slit  65  and second curved portion  64  (engaged part  64 A) of the depicted embodiment, respectively. The attaching-side plate portion  7 A further includes the first curved portion  73  and the protrusions  76 . An open region  70 A is defined in the attaching-side plate portion  7 A, instead of the open region  60 A. 
     As shown in  FIGS. 15 and 16 , the first curved portion  73  is connected to the top edges of the base portion  70  and first segment portion  71 . The first curved portion  73  is curved in a general U-shape in a side view. The first curved portion  73  is disposed lower than the top edges of the base portion  70  and first segment portion  71 . In this way, a bearing portion  73 A corresponding to an inner surface of the first curved portion  73  is arranged lower than the top edges of the base portion  70  and first segment portion  71 . The bearing portion  73 A is open on the top. That is, unlike the attaching-side member  6  of the embodiment, the open region  70 A is not in communication with the space provided by the bearing portion  73 A. Rather, the bearing portion  73 A (first curved part  73 ) partitions the space provided by the bearing portion  73 A and the open region  70 A in the vertical direction, i.e., interrupts communication between the space provided by the bearing portion  73 A and the open region  70 A, when the attaching-side member  7  is attached to the device-side member  5 . 
     As shown in  FIG. 16 , the protrusions  76  are configured of a protrusion  76 A and a protrusion  76 B. The protrusion  76 A is disposed on the top edge of the base portion  70 , and the protrusion  76 B is disposed on the top edge of the first segment portion  71 . The protrusion  76 A protrudes forward, while the protrusion  76 B protrudes rearward. The protrusions  76 A and  76 B oppose each other in the front-rear direction. In the following description, the protrusions  76 A and  76 B will be collectively called the “protrusions  76 .” The protrusions  76  are in proximity to the top of the bearing portion  73 A. A gap between the protrusions  76 A and  76 B is slightly smaller than the diameter R 11  of the shaft portion  55  constituting the device-side member  5  (see  FIG. 5 ). 
     Next, how to use the attaching loop member  3 M according to the modification will be described. First, the device-side member  5  and attaching-side member  7  are separate from each other to bring the attaching loop member  3 M into its separated state. The belt  1 B is then inserted into the open region  70 A of the attaching-side plate portion  7 A and mounted on the attaching-side member  7 . The user then positions the device-side member  5  above the attaching-side member  7  mounted on the belt  1 B and adjusts the device-side member  5  so that the device-side plate portion  51  is sloped relative to the front-rear direction. The user then arranges the device-side member  5  so that the shaft portion  55  is located above the bearing portion  73 A of the attaching-side member  7 . 
     Next, the user moves the device-side member  5  downward toward the attaching-side member  7  until the shaft portion  55  contacts the protrusions  76  of the attaching-side member  7  from above. The protrusions  76  restrict downward movement of the shaft portion  55 , but the user can move the device-side member  5  farther downward by applying more downward force. As the shaft portion  55  moves downward, the shaft portion  55  applies outward force to the protrusions  76 . Consequently, the first curved portion  73  resiliently deforms so that the gap between the protrusions  76 A and  76 B increases. In this way, the gap between the base portion  70  and first segment portion  71  increases to allow passage of the shaft portion  55 . Accordingly, the shaft portion  55  passes from above to below the protrusions  76  to reach the bearing portion  73 A. At this time, the resiliently deformed first curved portion  73  returns to its original state, engaging the shaft portion  55  with the bearing portion  73 A. The bearing portion  73 A rotatably supports the shaft portion  55  while the attaching loop member  3 M is in the first engaged state. 
     In the first engaged state, the device-side member  5  can pivot about the shaft portion  55  in an engaging direction (substantially parallel to the engaging direction Y 3 ) relative to the attaching-side member  7 . As shown in  FIGS. 17 and 18 , the user engages the engaging portion  57  with the engaged part  74 A, placing the attaching loop member  3 M in the second engaged state. In the process of shifting the attaching loop member  3 M from the first engaged state to the second engaged state, the rib  58  of the device-side member  5  becomes fitted into the slit  75  of the attaching-side member  7 . In this state, the rib  58  closes the slit  75 . When in the second engaged state, the attaching loop member  3 M retains the printing device  2  on the belt  1 B. 
     In this modification, the printing device  2  and device-side member  5  are supported by the first curved portion  73  that receives the shaft portion  55  from below and the slit  75  in which the rib  58  is fitted when a downward load is applied to the printing device  2  and device-side member  5 . In this way, the attaching-side member  7  can reliably retain the printing device  2  fixed to the device-side member  5  on the belt  1 B. 
     3. Other Variations of the Embodiment 
     In the depicted embodiment, the belt  1 B is inserted through the open region  60 A of the attaching-side member  6  constituting the attaching loop member  3 . However, the attaching loop member  3  may be attached to an object other than a belt worn about the user&#39;s waist, such as a shoulder strap or the like hung over the user&#39;s shoulder. 
     Further, the attaching-side member  6  may be configured with the top edge of the second segment portion  62  bent rearward. In this case, the rearwardly bent top edge of the second segment portion  62  may be joined to the front surface of the base portion  60 . In other words, a closed loop may be formed with just the base portion  60  and second segment portion  62 . In this case, the open region  60 A may be formed in a region between the base portion  60  and second segment portion  62 . Further, the radii of curvature for the engaging portion  57  and engaged part  64 A may be different from each other. In this case, a groove may be formed in the engaged part  64 A, and a protrusion may be formed on part of the distal edge of the engaging portion  57  for being fitted into the groove. Here, the engaging portion  57  need not have flexibility. 
     Further, the width L 23  of the slit  65  formed in the attaching-side member  6  may be substantially equivalent to the diameter R 11  of the shaft portion  55  constituting the device-side member  5 , or may be smaller than the diameter R 11 . For example, the first curved portion  63  and second curved portion  64  of the attaching-side member  6  may be resiliently deformed so as to increase the width of the slit  65  to a length greater than the diameter R 11  of the shaft portion  55 , thereby allowing the shaft portion  55  to pass through the slit  65 . 
     The gap L 32  between the first segment portion  61  and base portion  60  may be substantially equivalent to the diameter R 11  of the shaft portion  55  or may be smaller than the diameter R 11 . For example, the first curved portion  63  may be resiliently deformed to expand the gap between the first segment portion  61  and base portion  60  to a distance greater than the diameter R 11  of the shaft portion  55 . In this way, the shaft portion  55  can pass through the region of the open region  60 A between the base portion  60  and first segment portion  61 . 
     Further, the gap between the shaft support parts  541  and  542  may be smaller than the left-right dimension L 11  of the slit  65  formed in the attaching-side member  6 . In this case, grooves extending upward from the slit  65  may be formed in the first segment portion  61  of the attaching-side member  6 , for example. When the attaching loop member  3  is shifted from the separated state into the first engaged state, the shaft support parts  541  and  542  may move upward through these grooves as the shaft portion  55  moves upward along the open region  60 A. 
     The vertical dimension of the rib  58  may be smaller than the width of the slit  65 . Alternatively, the rib  58  may be omitted from the device-side member  5 . 
     The protrusions  66  in the embodiment are formed by bending portions of the attaching-side plate portion  6 A into the open region  60 A. However, the protrusions  66  may be formed by disposing protruding parts on the inner surfaces of the attaching-side plate portion  6 A. Alternatively, just one of the protrusion  66 A and  66 B may be formed on the attaching-side plate portion  6 A, or both protrusions  66  may be omitted from the attaching-side plate portion  6 A. 
     The vertical dimensions of the first segment portion  61  and second segment portion  62  may be set substantially equal to each other. Further, the vertical dimension of the first segment portion  61  may be greater than the vertical dimension of the second segment portion  62 . The vertical dimension of the second segment portion  62  may be smaller than the width of an average belt  1 B. In this case, the belt  1 B may be inserted into the open region  60 A through the slit  65 . 
     The device-side member  5  may be formed integrally with the printing device  2 . In other words, the device-side plate portion  51 , fixing portion  53 , shaft support part  54 , shaft portion  55 , engaging portion  57 , and rib  58  of the device-side member  5  may be formed as parts of the second casing  20 B constituting the printing device  2 . 
     While the disclosure is described in detail with reference to the specific embodiments thereof while referring to accompanying drawings, it would be apparent to those skilled in the art that many modifications and variations may be made therein without departing from the scope of the disclosure.