JP7240201B2 - Media positioner for media drive transport device - Google Patents

Description

The present invention relates to a medium positioning tool for a medium-driven transport device used to position a sheet-shaped medium in the medium-driven transport device.

2. Description of the Related Art Conventionally, apparatuses such as desktop printers and cutting plotters are provided with medium-driven transport devices for transporting sheet-like media such as printing paper and cutting sheets. As described in Patent Document 1, for example, this medium-driven transport device has a configuration in which thrust is applied to a medium placed on a transport stage by a rotating transport roller to transport the medium in the horizontal direction. There are many things.

In order for the medium-driven transport device to properly transport the medium, the media must be positioned in the media-driven transport device so that the edges in the width direction perpendicular to the transport direction extend parallel to the transport direction. This positioning is performed by a plate that is erected and fixed to the transport stage in the medium-driven transport device disclosed in Patent Document 1. FIG.

As a positioning member for performing this positioning, for example, there is one as described in Patent Document 2. A positioning member disclosed in Patent Document 2 is provided in a pinch roll assembly of a cutting plotter. This pinch roll assembly is configured to be movable in the width direction of the medium. Therefore, it is possible to change the position of the positioning member in the width direction of the medium.

Japanese Patent Application Laid-Open No. 2002-154714 Japanese Patent No. 3476258

The positioning member disclosed in Patent Document 1 is fixed to the carrier stage. Therefore, there is a problem that the medium cannot be placed at any position in the width direction.
The positioning member disclosed in Japanese Patent Laid-Open No. 2002-200020 can change the position in the width direction, and can set the medium at any position in the width direction.

However, the positioning member disclosed in Japanese Patent Application Laid-Open No. 2002-200000 has to be arranged so as to be in contact with both ends of the medium in the width direction in order to contact the medium even during transportation. The reason for this is that if the medium is transported in a state where the positioning member contacts only one side of the medium in the width direction, the medium may be tilted with respect to the transport direction due to the resistance due to the contact with the positioning member. For this reason, the positioning member disclosed in Patent Document 2 requires installation work for aligning the positions on both sides in the width direction of the medium, and this installation work becomes complicated.

Further, the positioning member disclosed in Patent Document 2 requires a dedicated mounting structure for the pinch roll assembly, which is a small component. Therefore, if this positioning member is used, the manufacturing cost of the medium-driven conveying device increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a medium positioning tool for a medium-driven transport device that can be easily installed at an arbitrary position on a transport stage and that can reduce the manufacturing cost of the medium-driven transport device. .

In order to achieve this object, a medium positioner for a medium-driven transport apparatus according to the present invention is used in a medium-driven transport apparatus that transports a sheet-like medium on a transport stage in a horizontal transport direction. A medium positioner for determining a position of a medium, comprising: a bottom surface that overlaps the transport stage; a side surface that extends upward from an edge of the bottom surface while the bottom surface is stacked on the transport stage; a protrusion that engages from above with a shape-changing portion formed to extend in a width direction that is a horizontal direction orthogonal to the conveying direction; It is formed so as to be parallel to the conveying direction when in a state of being held.

According to the present invention, in the medium positioning device of the medium-driven transport device, the transport stage protrudes transport rollers that sandwich the medium in cooperation with pinch rollers, and the bottom surface has the protrusions that correspond to the shape-changing portions. A concave portion may be formed in which the conveying roller can be loosely inserted in the engaged state.

According to the present invention, the medium positioning tool of the medium-driven transport device further comprises an upper surface connected to the upper end of the side surface and extending along the transport stage in a state where the bottom surface is superimposed on the transport stage. and the upper surface is formed so as to overlap with another transport stage of another medium-driven transport device having a model different from that of the medium-driven transport device having the transport stage, and the other medium-driven transport device includes: The medium is fed in the transport direction on the other transport stage, and the upper surface is engageable with another shape-changing portion formed on the other transport stage so as to extend in the width direction. the upper surface side projection is protrudingly provided, and the side surface is in a state in which the upper surface is overlapped with the other transportation stage and the upper surface side projection is engaged with the other shape changing portion, and the side surface is arranged in the transportation direction. may be formed so as to be parallel to the

According to the present invention, in the medium positioning device of the medium-driven transport device, the other transport stage protrudes from the other transport stage and pinches the medium in cooperation with another pinch roller. An upper surface side concave portion may be formed into which the other conveying roller can be loosely inserted while the side protrusion is engaged with the other shape changing portion.

The medium positioning tool according to the present invention is installed on the transport stage in a state in which the side surface is parallel to the transport direction by engaging the protrusion with the shape-changing portion of the transport stage. Then, by placing the medium on the transport stage and abutting the widthwise edge of the medium against the side surface of the medium positioning tool, the vertical side (one side extending in the transport direction) of the medium becomes parallel to the transport direction. Since the medium is transported by the medium-driven transport device while the medium is positioned in this manner, the medium is transported correctly in the transport direction without moving obliquely.

Since this medium positioner is detachable from the transport stage, it can be installed on the transport stage at any position in the width direction of the medium-driven transport device. Moreover, since the medium can be easily removed from the transport stage after the positioning of the medium is completed, the medium is not inclined with respect to the transport direction during transport.
In addition, since this medium positioner performs positioning using the shape-changing portion that is an existing component of the transport stage, a dedicated mounting structure is not required for the medium-driven transport apparatus, and the medium-driven transport system can be used. It can be installed without affecting the manufacturing cost of the device.
Therefore, it is possible to provide a medium positioning tool for a medium-driven transport device that can be easily installed at an arbitrary position on the transport stage and that can reduce the manufacturing cost of the medium-driven transport device.

1 is a perspective view of a cutting plotter using a media positioning device according to the present invention; FIG. FIG. 4 is a cross-sectional view showing a portion of the media-driven transport and cutting head; It is the perspective view which looked at the principal part from diagonally forward left upper direction. It is the perspective view which looked at the principal part from the front upper part. FIG. 3 is a cross-sectional view of the main parts of the medium positioning device and the conveying device; FIG. 4 is a perspective view showing a first usage pattern of the media positioner; FIG. 11 is a perspective view showing a second usage pattern of the media positioner; FIG. 10 is a cross-sectional view of the main parts of the medium positioning device and another transport device according to a second usage pattern;

1 to 8, an embodiment of a medium positioning tool for a medium-driven transport apparatus according to the present invention will be described in detail below. In this embodiment, an example in which the medium positioning device of the present invention is used in a conveying device of a cutting plotter will be described.

(Description of cutting plotter)
A cutting plotter 1 shown in FIG. 1 pulls out a sheet-like medium 4 onto a conveying stage 3 by a medium-driven conveying device 2 (hereinafter simply referred to as conveying device 2) shown in the upper part of FIG. This medium 4 is subjected to a cutting process on 3. After being cut, the medium 4 is sent from the carrier stage 3 to the front side of FIG.

(Description of media)
Although not shown in detail, the sheet-like medium 4 is formed by pasting a release paper to a film sheet with an adhesive. The cutting process applied to the medium 4 is a cutting process of cutting the film sheet together with the adhesive into a predetermined shape. A cutting plotter 1 according to this embodiment includes a sheet roll (not shown) at a position on the back side of the page of FIG. This sheet roll is formed by winding a raw sheet-like medium 4 into a roll. A medium 4 pulled out from the sheet roll is placed on the conveying stage 3 and sent by the conveying device 2 .

Therefore, the sheet-like medium 4 according to this embodiment is conveyed so that the longitudinal direction is the conveying direction. The conveying direction is the direction from the upper right side to the lower left side in FIG.
When the medium 4 is first placed on the transport stage 3, the medium positioning tool 6 according to the present invention is mounted on the transport stage 3, and the medium positioning tool 6 is used to align the longitudinal direction of the medium 4 in parallel with the transport direction. The medium 4 is positioned so that The configuration of the medium positioning tool 6 will be described later.

In the following description of the directions of the parts of the cutting plotter 1, the upstream side of the conveying direction from the conveying device 2 (the upper right side in FIG. The "front side" of the cutting plotter 1 is the downstream side in the conveying direction (lower left side in FIG. 1).
In the following description, the left-right direction and the up-down direction are indicated when the cutting plotter 1 in the installed state is viewed from the front. 1 is the right side of the cutting plotter 1, and the upper side of the cutting plotter 1 is the upper side of FIG. The horizontal direction of the cutting plotter 1 is a horizontal direction orthogonal to the transport direction of the medium 4 and is the width direction of the medium 4 .

(Description of transport device)
As shown in FIG. 2, the conveying device 2 includes a conveying roller 11 positioned below the medium 4, a pinch roller 12 positioned above the medium 4, and a motor (not shown) for driving the conveying roller 11. have. FIG. 2 is a simplified drawing of the conveying device 2 and its peripheral components. The breaking position in FIG. 2 is the position indicated by the line II--II in FIG. The conveying roller 11 and the pinch roller 12 each rotate about an axis extending in the left-right direction. The conveying roller 11 is configured such that its upper end portion is inserted into the through hole 13 of the conveying stage 3 from below and protrudes upward from the conveying stage 3 . In addition, the conveying rollers 11 and the through holes 13 are arranged at a plurality of positions arranged side by side at predetermined intervals in the left-right direction. The pinch rollers 12 are connected to a pressing mechanism (not shown), press the medium 4 against the transport rollers 11 from above, and pinch the medium 4 together with the transport rollers 11 . The medium 4 is conveyed by rotating the conveying roller 11 about the axis in the horizontal direction while the medium 4 is pressed against the conveying roller 11 .

(Description of the cutting device)
The cutting process is performed by a cutting head 21 arranged above and near the carrier stage 3 . The cutting head 21 has a cutting pen 22 that can be raised and lowered, and is supported by a guide rail 23 extending in the left-right direction so as to be freely movable in the left-right direction. The cutting head 21 according to this embodiment is attached to an endless belt 24 extending in the left-right direction, and the endless belt 24 is driven by a motor (not shown) to rotate, thereby moving the cutting head 21 in the left-right direction along the guide rail 23 . move to

The cutting pen 22 has a blade 25 (see FIG. 2) at its lower end, and rises so that the blade 25 is positioned above the medium 4 when cutting is not performed, and the blade 25 pierces the medium 4 during cutting. descend to
In the cutting process by the cutting head 21, the cutting head 21 moves in the left-right direction with the blade 25 stuck in the medium 4, and the medium 4 moves in the front-rear direction (downstream and upstream in the conveying direction) by the conveying device 2. done by moving.

The cutting head 21 also has a cutting blade 26 for cutting the medium 4 . The cutting blade 26 moves in the left-right direction through a cross-cut hole 27 extending in the left-right direction in the transport stage 3 to cut off the downstream side of the medium 4 from the upstream side in the transport direction. The cross-cut holes 27 shown in FIG. 2 are constituted by grooves that open upward, and as shown in FIG. It is In other words, the cross-cut holes 27 are formed in the transport stage 3 so as to extend in the width direction, which is the horizontal direction orthogonal to the transport direction.

The cross-cut hole 27 may be formed as a groove as shown in FIG. 2, or may be formed as a slit that divides the carrier stage 3 into the front side and the rear side (not shown).
In the cutting plotter 1 according to this embodiment, the cross-cut hole 27 is used to determine the mounting position of the medium positioning tool 6, which will be described later.

(Description of medium positioning tool)
As shown in FIGS. 3 and 4, the medium positioning tool 6 is formed in a plate shape that can be inserted between the transfer stage 3 and the guide rail 23 of the transfer device 2, and positions the medium 4 with respect to the cutting plotter 1. It is attached to the carrier stage 3 when
The medium positioning device 6 is molded of a plastic material into a predetermined shape, and as shown in FIG. The breaking position in FIG. 5 is the position indicated by the VV line in FIG. In this embodiment, the cross-cut hole 27 corresponds to the "shape changing portion" of the present invention, and the first protrusion 31 corresponds to the "protrusion" of the first aspect of the invention. In the following, when indicating the direction of each part of the medium positioning tool 6, the direction when the medium positioning tool 6 is attached to the cutting plotter 1 as a first usage mode described later is shown.

As shown in FIGS. 6 and 7, the medium positioner 6 is a square having a bottom surface 32 with a first protrusion 31, a left side 33, a right side 34, a front surface 35, a rear surface 36 and a top surface 37. is formed into a plate shape. The medium positioning device 6 according to this embodiment has a first usage pattern used in the conveying device 2 of the cutting plotter 1 shown in FIG. 8) can be used by switching to the second mode of use used in another conveying device 42. As shown in FIG.

When the medium positioning tool 6 is used in the first mode of use, it is placed on the carrier stage 3 with the bottom surface 32 positioned downward. When the medium positioning device 6 is used in the second mode of use, as shown in FIG. 8, the other conveying device 42 provided in the other cutting plotter 41 is positioned with the upper surface 37 positioned downward. It is used by placing it on another carrier stage 43 . Another transport device 42 transports a medium (not shown) on another transport stage 43 in the transport direction (horizontal direction in FIG. 8).

The bottom surface 32 of the medium positioning tool 6 is a surface that overlaps the transfer stage 3 of the cutting plotter 1 shown in this embodiment, and is formed in a rectangular shape elongated in the front-rear direction in a plan view together with the top surface 37 . Letters 44 are printed on the bottom surface 32 to identify the model of the cutting plotter 1 when the second mode of use is adopted. In this embodiment, as shown in FIG. 7, the letter 44 is formed by a groove formed in the shape of the letter "B". The characters 44 are formed when the media locator 6 is molded.

The first protrusion 31 protrudes from the middle portion of the bottom surface 32 in the front-rear direction, and is formed to extend from the left end to the right end of the bottom surface 32 without interruption. The first protrusion 31 according to this embodiment is formed by a protrusion having a square cross section extending in the left-right direction. A first concave portion 45 is formed in the vicinity of the first projection 31 at an intermediate portion in the front-rear direction of the bottom surface 32 in order to avoid interference with the conveying roller 11 when adopting the first mode of use. . As shown in FIG. 5, the first concave portion 45 is located at a position corresponding to the conveying roller 11 when the medium positioning member 6 is placed on the conveying stage 3 and the first projection 31 is engaged with the crosscut hole 27 . is formed in The first concave portion 45 is formed by a concave curved surface with an arcuate cross-section extending continuously from the left end to the right end of the bottom surface 32 so that the conveying roller 11 can be inserted loosely.

The left side 33 and the right side 34 are formed parallel to each other. More specifically, the left side surface 33 and the right side surface 34 each have a predetermined vertical width between the bottom surface 32 and the top surface 37, and are orthogonal to the extending direction (horizontal direction, width direction) of the first projection 31. It is formed so as to extend in the direction. That is, the left side surface 33 and the right side surface 34 are formed so as to be parallel to the conveying direction when the first projection 31 is engaged with the crosscut hole 27 . These left side surface 33 and right side surface 34 correspond to the "side surface" in the present invention.

The upper surface 37 is parallel to the bottom surface 32 and extends along the carrier stage 3 while the bottom surface 32 overlaps the carrier stage 3 . A second protrusion 46 protrudes from the front end of the upper surface 37 . The second protrusion 46 is configured by a ridge that protrudes upward from the front end of the upper surface 37 and extends from the left end to the right end of the upper surface 37 without interruption. Specifically, the second projection 46 extends in a direction parallel to the direction in which the first projection 31 extends and in a direction perpendicular to the left side 33 and the right side 34 .

The second projection 46 is for positioning the medium positioner 6 when the medium positioner 6 is used in the second mode of use, as shown in FIG. The other conveying stage 43 of the other cutting plotter 41 when adopting the second mode of use has a corner 51 formed at the rear end. The corner 51 is formed to extend in the left-right direction (width direction) from the left end to the right end of the other transport stage 43 . In this other cutting plotter 41, the corner 51 corresponds to "another shape changing portion" according to the third aspect of the invention.

The second protrusion 46 is formed to cooperate with the bottom surface 32 to engage the corner 51 from above. In this embodiment, the second projection 46 corresponds to the "upper surface side projection" in the third aspect of the invention.
The left side 33 and the right side 34 of the medium positioner 6 have an upper surface 37 overlapping another transfer stage 43 of another cutting plotter 41 and a second protrusion 46 engaging a corner 51 of another cutting plotter 41 . In this state, it becomes parallel to the conveying direction of the medium of the other cutting plotter 41 .

A second concave portion 52 is formed in an intermediate portion in the front-rear direction of the upper surface 37 of the medium positioning device 6 . This second concave portion 52 is formed to avoid interference with another conveying roller 53 (see FIG. 8) of another cutting plotter 41 when the medium positioning device 6 is used in the second mode of use. . As shown in FIG. 8, the second concave portion 52 is formed so that the medium positioning member 6 is placed on another transfer stage 43 of another cutting plotter 41 so that the second projection 46 is positioned at the corner 51 so as to be in the second mode of use. is formed at a position corresponding to another conveying roller 53 in a state of being engaged with . The second concave portion 52 is formed by a concave curved surface having an arcuate cross-section that extends continuously from the left end to the right end of the upper surface 37 so that the other conveying roller 53 can be inserted loosely. In this embodiment, the second concave portion 52 corresponds to the "upper surface side concave portion" in the fourth aspect of the invention. The other conveying roller 53 rotates around the axis in the left-right direction while sandwiching the medium together with the other pinch roller 54 .

On the upper surface 37 of the medium positioning tool 6, as shown in FIG. 6, characters 55 are written that can identify the model of the cutting plotter 1 when adopting the first mode of use. In this embodiment, the letter 55 is formed by a groove formed in the shape of the letter "A". The characters 55 are formed when the media positioner 6 is molded.

(Description of the operation of the medium positioning tool)
The cutting plotter 1 and other cutting plotters 41 according to this embodiment can use a plurality of types of media 4 with different lengths in the width direction, and the position of the medium 4 in the left-right direction (the width direction of the medium 4) is It is changeable. The operation of determining the position of the medium 4 in the left-right direction is performed with the medium positioning tool 6 mounted at a predetermined position on the transport stage 3 or another transport stage 43 .

When mounting the medium positioning tool 6 on the cutting plotter 1 shown in FIG. The predetermined position here is the right end or the left end of the position where the left side 33 or the right side 34 passes the medium 4 . By engaging the first protrusion 31 with the crosscut hole 27, the left side surface 33 and the right side surface 34 become parallel to the conveying direction.

The medium 4 is placed on the transport stage 3 while the medium positioning tool 6 is installed on the transport stage 3 in this way. By abutting the widthwise edge of the medium 4 against the left side 33 or the right side 34 of the medium positioning tool 6, the vertical side (one side extending in the conveying direction) of the medium 4 becomes parallel to the conveying direction. The medium positioner 6 is removed from the transport stage 3 after the medium 4 is positioned with respect to the transport stage 3 .
By feeding the medium 4 by the transport device 2 in a state where the medium 4 is positioned and the medium positioning tool 6 is removed in this manner, the medium 4 is transported in the transport direction without being transported obliquely.

Since the medium positioning tool 6 is detachable from the transport stage 3 , it can be installed on the transport stage 3 at any position in the width direction of the transport device 2 . Moreover, since the medium 4 can be easily removed from the transport stage 3 after the positioning of the medium 4 is completed, the medium 4 does not contact the medium positioning tool 6 during transport and incline with respect to the transport direction.
In addition, since the medium positioning tool 6 performs positioning using the cross-cut hole 27 (shape changing portion), which is an existing component of the transport stage 3, the transport device 2 does not require a dedicated mounting structure. , and can be installed without affecting the manufacturing cost of the transport device 2 .
Therefore, according to this embodiment, it is possible to provide a medium positioning tool for a medium-driven transport device that can be easily installed at an arbitrary position on the transport stage 3 and that can keep the manufacturing cost of the transport device 2 low. be able to.

Conveying rollers 11 that pinch the medium 4 in cooperation with pinch rollers 12 protrude from the conveying stage 3 according to this embodiment. The bottom surface 32 of the medium positioning member 6 is formed with a first recess 45 into which the transport roller 11 can be loosely inserted while the first projection 31 is engaged with the crosscut hole 27 .
Therefore, when determining the mounting position of the medium positioning member 6 in the left-right direction of the cutting plotter 1 , there is no restriction by the conveying roller 11 . Therefore, it is possible to provide a medium positioning tool for a medium-driven conveying device with a high degree of freedom in the position through which the medium 4 is passed.

The medium positioner 6 has a top surface 37 extending along the transport stage 3 with the bottom surface 32 overlapping the transport stage 3 . The upper surface 37 is formed so as to overlap another transfer stage 43 of another cutting plotter 41 (transfer device 42 ) whose model is different from that of the cutting plotter 1 (transfer device 2 ) having the transfer stage 3 . The upper surface 37 is formed with a second protrusion 46 that can be engaged with a corner 51 of another transfer stage 43 of another transfer device 42 . The left side surface 33 and the right side surface 34 are formed parallel to the conveying direction with the second projection 46 engaged with the corner 51 .

Therefore, it is possible to adopt a first usage pattern in which the bottom surface 32 is overlapped with the transport stage 3 and a second usage pattern in which the top surface 37 is overlapped with another transport stage 43 with one medium positioning member 6. One medium positioning tool 6 can be used with two types of cutting plotters 1 and 41 .
Therefore, compared to the case where the medium positioning tool 6 is manufactured for each model of the cutting plotter 1, 41, the number of molds for molding the medium positioning tool 6 can be reduced, so the manufacturing cost can be further reduced. becomes possible.

The upper surface 37 of the media positioning tool 6 according to this embodiment has a second protrusion 46 that engages a corner 51 of the other transport device 42 of the other cutting plotter 41 . A second concave portion 52 is formed into which the conveying roller 53 can be loosely inserted.
Therefore, even when the medium positioning device 6 is installed in another cutting plotter 41 , the horizontal installation position is not restricted by the other transport rollers 53 of the other cutting plotter 41 . Therefore, in both of the two types of cutting plotters 1 and 41, the flexibility of the position through which the medium 4 is passed is increased.

In the embodiment described above, an example in which the medium positioning device 6 according to the present invention is used in the conveying device 2 of the cutting plotter 1 is shown. However, the present invention is not limited to such a limitation, and can be applied to a printing machine having a conveying device for feeding printing paper and a drawing plotter.
Furthermore, in the embodiment described above, an example in which the first and second projections 31 and 46 are respectively formed by ridges has been shown. However, the first and second protrusions 31 and 46 can each be composed of a plurality of protrusions, although not shown. In this case, projections are provided at a plurality of positions on the medium positioning device 6 that are aligned in the left-right direction at predetermined intervals.

DESCRIPTION OF SYMBOLS 1... Cutting plotter, 2... Conveying device (medium drive type conveying device), 3... Conveying stage, 4... Medium, 6... Medium positioner, 11... Conveying roller, 12... Pinch roller, 27... Cross cut hole (shape change part), 31... First protrusion (protrusion), 32... Bottom surface, 33... Left side surface (side surface), 34... Right side surface (side surface), 37... Top surface, 42... Other conveying device (another medium-driven conveying device), 43... other transport stage, 45... first recess (recess), 46... second protrusion (top surface side protrusion), 52... second recess (top surface side recess), 53... other transport roller , 54 . . . other pinch rollers.

Claims (3)

A medium positioner used in a medium-driven transport device for transporting a sheet-shaped medium in a horizontal transport direction on a transport stage to determine the position of the medium,
a bottom surface superimposed on the transfer stage;
a side surface extending upward from an edge of the bottom surface in a state where the bottom surface is superimposed on the transfer stage;
a protrusion that engages from above with a shape-changing portion formed on the transport stage so as to extend in a width direction that is a horizontal direction perpendicular to the transport direction;
The side surface is formed to be parallel to the conveying direction in a state in which the protrusion is engaged with the shape-changing portion ,
a conveying roller that pinches a medium in cooperation with a pinch roller protrudes from the conveying stage;
A medium positioning apparatus for a medium-driven conveying device, wherein the bottom surface is formed with a recess into which the conveying roller can be loosely fitted while the projection is engaged with the shape-changing portion. equipment. A media positioner for a media driven transport device according to claim 1 , wherein
further comprising an upper surface connected to the upper end of the side surface and extending along the transport stage in a state where the bottom surface is superimposed on the transport stage;
The upper surface is formed so as to overlap another transport stage of another medium-driven transport device different in model from the medium-driven transport device having the transport stage,
The other medium-driven transport device transports the medium in the transport direction on the other transport stage,
The upper surface is provided with an upper surface-side projection that can be engaged with another shape-changing portion formed on the other transport stage so as to extend in the width direction,
The side surface is formed so as to be parallel to the conveying direction in a state in which the upper surface is superimposed on the other conveying stage and the upper surface-side protrusion is engaged with the other shape-changing portion. A media positioner for a media driven transport device, characterized in that: The media positioner of the media driven transport device according to claim 2 ,
Another transport roller that pinches the medium in cooperation with another pinch roller protrudes from the other transport stage, and the upper surface side protrusion is engaged with the other shape changing portion on the upper surface. and a medium positioning member for a medium-driven conveying device, wherein a concave portion is formed on the upper surface side into which the other conveying roller can be inserted in a loosely fitted state.

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