JP6457300B2 - Media transport mechanism - Google Patents

Description

  The present invention relates to a printing apparatus that performs printing by ejecting ink from a print head onto a printing medium such as paper or cloth, and more particularly, to a conveyance mechanism such as cloth in a printer or plotter.

The printing medium is spread on the platen, and the printing medium is sandwiched between the conveyance roller and the pressure roller, and the printing medium is sent in a predetermined direction by the rotation of the conveyance roller, while printing is performed on the printing surface of the platen by the recording head. 2. Description of the Related Art Conventionally, in a printer apparatus that performs printing on a medium, a conveyance mechanism having a structure in which the middle of a long straight tube type pressure roller is pressed by a backup roller and the pressure roller is in close contact with the conveyance roller is known. (For example, refer to Patent Document 1).
Further, a transport mechanism having a structure in which a sheet is individually pressed against a transport roller by a plurality of short pressure rollers is known (see, for example, Patent Document 2).
Further, the sheet is spread on the platen, the sheet is sandwiched between the conveyance roller and the pressure roller, and the sheet is fed in a predetermined direction by the rotation of the conveyance roller. In an ink jet printer that reciprocates in a transverse direction and prints on a sheet on the printing surface, the conveying roller and the pressure roller are arranged on the upstream side of the sheet conveying path with respect to the printing surface of the platen. Further, a cylindrical suction roller is rotatably disposed on the downstream side or the printing surface, and a paper suction force is generated on at least the surface of the suction roller that supports the paper, and the upstream side of the paper is pressurized with the transport roller. The sheet is sandwiched between rollers, the downstream side of the sheet or the printing unit is brought into close contact with the sheet support surface of the suction roller, and the transport roller and the suction roller are synchronously rotated in the same direction and Sheet feeding apparatus being characterized in that so as to drive so as to be substantially the same peripheral speed is conventionally known (see Patent Document 3).
Further, in the roller recording paper feed type recording apparatus in which the recording paper is driven by the conveying roller and the pinch roller, a sub roller is provided, and a predetermined position between both the rollers including the sub roller and the conveying roller is set as a recording position. 2. Description of the Related Art A conventional roller recording paper feed type recording apparatus has means for changing the peripheral speed of both rollers according to the recording paper transport direction in order to optimize the tension of the recording paper at the recording position. It is known (see Patent Document 4).
Also, the rotation speed of each divided roller is controlled based on the detection result of the horizontal position detecting means for detecting the horizontal position of the web, a roller unit composed of a plurality of independently driven divided rollers, and the horizontal position detecting means. There is conventionally known a printer apparatus that includes a control unit that adjusts the speed of the dividing roller and changes the structure of the roller during web conveyance (see, for example, Patent Document 5).

Japanese Patent Laid-Open No. 11-240654 Japanese Patent Laid-Open No. 7-117885 JP 2000-351499 A JP-A-62-146859 JP 2009-249047 A

When a long straight tube type pressure roller is used in a mechanism that conveys a print medium such as a cloth between a long straight tube type conveyance roller and a pressure roller onto a platen, the pressure roller The entire surface of the print medium in the width direction can be pressed against the conveyance roller on the surface, which is suitable for conveyance of a print medium such as a cloth that is easily wrinkled. However, since this long straight tube type pressure roller is likely to bend when the width of the print medium is wide, the degree of adhesion of the print medium pressed against the pressure roller to the conveyance roller due to the presence of the bent portion. In some cases, a difference may occur in the print medium, and uniform high-precision conveyance in the width direction of the print medium cannot be obtained.
The main object of the present invention is to solve the problem of bending of a long straight pipe type pressure roller and to allow the entire pressure roller to be in close contact with the conveying roller with a uniform degree of adhesion.
In addition, when printing is performed by transporting cloth or the like, it is desirable to transport with tension. Conventionally, as shown in the patent document, there is a structure in which the tension is conveyed by increasing the peripheral speed of the discharge side roller and slipping on the roller surface. However, this structure is not stable because the print medium such as the cloth is not firmly held and conveyed. In addition, there is a problem that the apparatus using the suction mechanism cannot cope with the cloth.
Another object of the present invention is to solve the above problems.
Further, in the case of transporting a sheet-like print medium such as a cloth, the stretch rate and the like are different between the center of the transported cloth and the end. For this reason, the normal conveyance structure cannot cope with the elongation of the end of the cloth, so that there is a problem in that it cannot be conveyed with a load applied by a roller adapted to the stretched portion of the cloth.
Another object of the present invention is to provide a simple structure in the conveyance path so that the printing medium can be supplied or taken up in a state where a load is applied by properly contacting an expanded portion or a contracted portion of the printing medium. It is to be.
Further, if the printing medium is wrinkled before the printing medium is supplied to the straight tube type pressure roller, there is a problem that the printing medium is pressurized and conveyed as it is.
Another object of the present invention is to supply a printing medium to a long straight tube type pressure roller in a state where generation of wrinkles is suppressed.

In order to achieve the above object, the present invention extends in the width direction with respect to an apparatus main body, a printing unit provided in the main body, and a printing medium rotatably supported at a fixed position on the fixing side of the main body. A cylindrical conveyance roller, a cylindrical pressure roller that extends in the width direction with respect to the print medium, a print medium supply unit that rotatably holds the roll-shaped print medium, and the print medium after printing A print medium discharge unit for guiding the print medium to a print medium discharge side, and a print medium conveyance drive unit having a drive unit for rotationally driving the conveyance roller. Both ends of the pressure roller are connected to the main body with respect to the conveyance roller. Movably and rotatably supported in this direction, sandwiching the print medium between the transport roller and the pressure roller, rotating the transport roller to transport the print medium in a predetermined direction, By the printing unit for the print medium A printing apparatus for performing printing, wherein one side of the lower portion of the pressure roller is placed on the upper surface of the transport roller, and the pressure roller is held at a fixed position on the other side of the lower portion of the pressure roller. A restricting means is arranged, and both lower sides press the upper part of the pressure roller held by the restricting means and the transport roller by the forcing means in the direction of the transport roller and pressurize by the pressing force of the forcing means It is characterized by correcting the deflection of the roller.
In the invention, it is preferable that the restricting means includes an attachment member fixed to the fixed side of the main body and a restriction member that is connected to the attachment member so as to be movable within a predetermined range, and the pressurizing force is applied to the restriction member. A receiving portion for receiving the lower portion of the roller is provided.
Further, the present invention is characterized in that a plurality of the regulating means are arranged facing the axial direction of the pressure roller.
Further, the present invention is characterized in that a plurality of forcing means are arranged facing the axial direction of the pressure roller.
The present invention is characterized in that a positioning mechanism for positioning the regulating member on the mounting member is provided in the regulating means.
In the present invention, the forcing means is composed of a forcing member that is swingably supported on the fixed side of the main body, and a biasing means that applies a biasing force to the forcing member in the swinging direction. The pressing member for pressing the pressure roller is provided on the forcing member.
Further, the present invention is characterized in that the receiving portion is attached to the regulating member so as to be rotatable about an axis parallel to the rotation center axis of the pressure roller.
Further, the invention is characterized in that the receiving part is constituted by a ball bearing.
According to the present invention, a reference shaft that extends in a direction perpendicular to the conveyance direction of the print medium is disposed on the apparatus main body so as to face the pressure roller, and the restriction member is disposed on the reference shaft. The reference shaft body is arranged so as to be movable in a direction orthogonal to this, and the reference shaft body serves as a reference for movement adjustment of the restricting member.
According to the present invention, a shaft body extending in a direction perpendicular to the conveyance direction of the print medium is disposed on the apparatus body so as to face the pressure roller, and the forcing member is rotatably fitted to the shaft body. The pressing portion is attached to the forcing member so as to be rotatable about an axis parallel to the rotation center axis of the pressure roller, and the pressing portion is attached to the upper portion of the pressure roller by an urging force acting on the forcing member. It is characterized by being in pressure contact.
Further, the present invention is characterized in that the pressing portion is constituted by a ball bearing.
According to the present invention, an urging force adjusting mechanism is provided in the urging force applying means for applying an urging force to the forcing member.
According to the present invention, the shaft body is rotatably supported by the apparatus main body, a cam plate is fixed to the shaft body, an engagement portion that engages with the forcing member is provided on the cam plate, and the shaft body is rotated. Then, the forcing member is rotated against the urging force by the pressing force from the engaging portion of the cam plate interlocking with this, and the pressing portion is separated from the pressure roller. .
Further, the invention is characterized in that the contact portion provided on the regulating member is released from contact with the pressure roller when the pressure roller moves upward.
According to the present invention, the print medium discharge unit includes a discharge side guide roller provided with a meshing surface that meshes with the print medium on a peripheral surface, a discharge side guide roller driving unit that drives a support shaft of the discharge side guide roller, A torque limiter connected to the support shaft of the discharge side guide roller, the peripheral speed of the discharge side guide roller is set faster than the peripheral speed of the transport roller, and printing between the transport roller and the discharge side guide roller When the tension of the medium exceeds a predetermined value, the torque limiter cuts off the torque transmission from the discharge side guide roller driving unit, and the tension of the printing medium is held at a predetermined value. To do.
Further, the present invention is characterized in that the meshing surface of the discharge side guide roller is configured such that minute protrusions are densely arranged.
According to the present invention, the discharge side guide roller driving unit is configured by a driving unit that drives the conveyance roller, and the rotation output of the print medium conveyance driving unit is transmitted to the input side of the torque limiter via a power transmission mechanism. It is characterized by that.
In the invention, it is preferable that the print medium is a sheet material such as cloth.
In the invention, it is preferable that the discharge-side guide roller is provided at a place where the transport direction of the print medium is changed.
The present invention also provides a print medium supply unit that rotatably holds a roll-shaped print medium in the apparatus main body, and a print medium supply that guides the print medium fed out from the print medium supply unit to the print medium conveyance drive unit. And a support shaft disposed in a direction crossing the print medium on a print medium supply conveyance path between the print medium supply unit and the print medium supply side guide unit, and loosely fitted to the support shaft. A flexible split roller mechanism including a plurality of hollow split rollers is disposed, and the print medium is pressed against the lower peripheral surface of the split roller.
Further, the present invention provides a printing medium winding unit for winding a printed printing medium on the apparatus main body, and the printing medium is disposed in a printing medium discharge conveyance path between the printing medium discharging unit and the printing medium winding unit. A flexible split roller mechanism comprising a support shaft arranged in a transverse direction and a plurality of hollow split rollers loosely fitted on the support shaft is arranged, and the print medium is pressed against the lower peripheral surface of the split roller. It is characterized by.
Further, the invention is characterized in that a weight is attached to at least one of the plurality of divided rollers.
Further, the present invention is characterized in that the support shaft is attached to a pair of arms that are pivotally supported on the side of the machine body.
According to the present invention, the apparatus main body is provided with a print medium supply side guide for guiding the print medium to the print medium conveyance drive unit, and the print medium supply side guide is provided with a meshing surface that meshes with the print medium on the peripheral surface. The supply side guide roller and a torque limiter connected to the support shaft of the supply side guide roller, and tension is applied to the print medium that moves the supply side guide roller in the direction of the print medium conveyance drive unit. The tension between the print medium conveyance drive unit and the supply side guide roller of the print medium is maintained at a predetermined value by the torque transmission blocking operation of the torque limiter. And
Further, the present invention is characterized in that the meshing surface of the supply side guide roller has a structure in which minute protrusions are densely arranged.

The present invention is provided with a plurality of forcing means for forcing the bending portion of the pressure roller in the direction of the conveying roller, and a plurality of regulation means for restricting the movement of the pressure roller in the direction of escaping due to the pressure from the forcing means. Therefore, the entire pressure roller can be brought into close contact with the conveying roller with uniform pressure. This eliminates the difference in adhesion to the transport rollers at the edge or middle of the print medium such as the cloth that is transported, improving the transport accuracy of the print medium, and good printing even for long transports. The result can be obtained. This is particularly effective for an apparatus that performs printing while conveying a wide medium.
Further, according to the present invention, since the surface of the roller is in contact with the cloth or the like by the contact from the back side of the print medium, an appropriate tension can be applied to the entire print medium such as the cloth, and a torque limiter can be used to generate torque. Since it is adjusted, it can be conveyed with constant tension. In addition, since a roller is provided at a place to change the conveyance direction of the medium, not only the upper surface of the roller but also a certain distance on the peripheral surface is gathered on the cloth, so that no slip occurs between the roller and the cloth. In the case of a wide print medium, the contact area in the width direction is large, so that the print medium can be reliably held only by contact from the back surface.
In addition, the present invention has a simple structure in which a roller is passed through a shaft and can cope with the elongation of a printing medium such as a cloth. Therefore, it is possible to carry in a good state with no slack in the printing position and the winding portion.
In addition, the present invention is provided with a structure for engaging and holding the surface of the supply side guide roller and a mechanism for adjusting the torque from the torque limiter. Printing media can be supplied to the rollers.

It is explanatory drawing of the principal part of this apparatus. It is explanatory drawing of the principal part of this apparatus. It is explanatory drawing of the principal part of this apparatus. It is explanatory drawing of the principal part of this apparatus. It is an external view of the principal part of this apparatus. It is an external view of the principal part of this apparatus. It is an external view of the principal part of this apparatus. 1 is an overall external view of a printer apparatus. It is a whole explanatory view of this device. It is explanatory drawing of this apparatus. It is a section explanatory view of this device. It is explanatory drawing of this apparatus. It is explanatory drawing of a discharge side guide roller. FIG. 3 is a diagram illustrating an appearance of a part of a print medium discharge unit of the apparatus. It is sectional explanatory drawing of the flexible division | segmentation roller mechanism of this apparatus. It is explanatory drawing of the flexible division | segmentation roller mechanism of this apparatus. It is a section explanatory view showing other embodiments of this device.

Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 9 is an explanatory diagram showing the overall structure of the printer apparatus 2. In FIG. 9, the left side is the front of the apparatus 2, the right side is the rear of the apparatus 2, and the direction perpendicular to the paper is the head operating direction. The main body of the printer apparatus 2 includes a printing unit 4, a printing medium conveyance drive unit 6, a printing medium supply side guide unit 7, a printing medium supply conveyance path unit 8, a printing medium supply unit 10, and a printing medium discharge unit 12. And a print medium discharge / conveyance path section 14 and a print medium take-up section 16, and from the print medium supply section 10 through the print medium supply / conveyance path section 8 to the gutter 18 (see FIG. 10) of the printing section 4. Printing is performed on the supplied print medium 20 by ejecting ink from the print head 24 of the head unit 22 (see FIG. 1) of the printing unit 4.

  FIG. 8 is an overall perspective view of the printer device 2 as viewed from the front. The printing unit 4 of the printer apparatus 2 includes a head guide rail 26 supported by the machine body 2a of the apparatus 2, and a head unit 22 including an ink jet type print head 24 via the carrier is provided on the head guide rail 26. It is attached so as to be movable along the guide rail 26. The direction along the head guide rail 26 of the head unit 22 is defined as the Y-axis direction of the device 2.

Below the head guide rail 26, there is provided a print medium support portion 28 that supports the print medium 20 such as cloth and guides the print medium forward from the rear of the machine body 2 a, and an intermediate portion (under the head unit) of the support portion 28. The ink discharge range) includes a gutter 18 that is an ink receiver that receives ink that passes through the texture of the print medium 20 and falls down among the ink ejected toward the print medium 20. The ink discharge surface of the print head 24 is horizontally disposed opposite to the print surface of the print medium 20 supported by the support unit 28.

In the vicinity of the movement path of the print head 24, a long straight pipe type conveyance roller 30 extending in the Y axis direction and a long straight pipe type pressure roller 32 similarly extending in the Y axis direction are arranged and conveyed. The roller 30 is connected to an X-axis drive device controlled by a controller, and is supported on the machine body 2a side so as to be rotatable about an axis parallel to the Y-axis. Both ends of the pressure roller 32 are supported on the machine body 2 a side so as to be rotatable about the axis parallel to the Y axis and to be movable up and down with respect to the transport roller 30.

Since the long straight pipe type pressure roller support mechanism employs a conventionally known mechanism, its illustration and description are omitted. As shown in FIG. 10, the pressure roller 32 is disposed obliquely above a predetermined angle in the circumferential direction from the position directly above the conveyance roller 30, and the lower surface of the pressure roller 32 is in the lowered state of the conveyance roller 30. In FIG. 9, it is configured so as to face each other in parallel with the conveying roller 30 at an obliquely upward position shifted by a predetermined angle in the clockwise direction from the top. Therefore, since the printing medium 20 between the supply side roller 46 and the transport roller is located at a position higher than the lower surface of the pressure roller 32, the contact point between the pressure roller 32 and the transport roller 30 as shown in the positional relationship in FIG. A wider contact area provides conveying force.

  A conveyance roller 30 connected to the X-axis drive device and a pressure roller 32 supported so as to freely rotate constitute a print medium conveyance drive unit 6. The print medium supply unit 10 includes a supply shaft 34 (see FIG. 8) that holds a print medium roll around which the print medium 20 is wound. Legs 2b, 2b and a base plate 2c are fixed to the body 2a, and the body 2a is disposed on the floor via these. Delivery devices 48 and 50 are arranged on the base plate 2c. The supply shaft 34 provided in the delivery devices 48 and 50 is connected to a motor controlled by a controller.

The print medium supply side guide section 7 is disposed behind the support section 28 (refer to FIG. 8) called a platen, in the Y-axis direction, in parallel with the guide rail 26 over the entire length in the width direction of the print medium 20. The side guide roller 46 includes a support shaft 52 that protrudes from the center of both ends of the supply side guide roller 46. As shown in FIG. 10, the support shaft 52 of the supply side guide roller 46 for removing wrinkles of the print medium is connected to the support shaft 64 of the transport roller 30 through a belt transmission mechanism and a gear mechanism. It is configured to rotate in the reverse direction. An endless belt 58 is hung between a pulley 54 fixed to the support shaft 64 of the conveying roller 30 and a rotatable pulley 56 on the machine body 2a side. A gear 60 is fixed to the roller support shaft fixed to the pulley 56, and the gear 60 is engaged with a gear 62 fixed to the support shaft 52 of the wrinkle removal supply side guide roller 46.

The conveyance roller 30 is fixed to the support shaft 64, and the supply side guide roller 46 is fixed to the support shaft 52.
The print medium discharge unit 12 of the present apparatus is disposed in front of a support unit (platen) 28, and includes a discharge side guide roller 78, a support shaft 80 connected to the discharge side guide roller 78, and a torque limiter on the support shaft 80. The pulley 94 is connected via a (not shown). Winding devices 104 and 104 (see FIG. 8) are arranged on the left and right sides of the base plate 2c, and winding shafts 102 and 102 are provided on the devices 104 and 104, and a printing medium is provided between the winding shafts 102 and 102. A shaft body for winding 20 is detachably held.

A split roller mechanism 106 that guides the printing medium 20 to a winding shaft is disposed in the vicinity of the printing medium winding unit 16 of the apparatus.
One of the winding devices 104 and 104 includes a drive motor controlled by a controller, and an output shaft of the drive motor is connected to the winding shaft 102. Storage boxes 112 and 114 are provided on both sides of the machine body 2a of the printer apparatus 2. The one box 112 has a liquid ink ejected onto the print medium, a maintenance mechanism for maintaining the print head 24, etc. (capping mechanism and A cleaning mechanism and the like are installed, and an operation panel 116 for operating the printer device 2 is installed at the top. One box 114 has a space for maintenance when the head is moved.

Next, the print medium conveyance drive unit 6 will be described with reference to FIGS.
Each of the transport roller 30 and the pressure roller 32 that pressurizes the transport roller 30 is composed of a long cylindrical body in which a long straight pipe-type metal pipe is covered with rubber. The conveying roller 30 is arranged in parallel to the Y axis, and a plurality of appropriate positions at the lower part of the intermediate portion thereof are rotatably supported by short axis rollers 120 and 120 each including ball bearings arranged on the left and right. Yes.

Both ends of the pressure roller 32 are supported on the machine body 2 a side so as to be movable up and down at a position obliquely above the conveying roller 30. On the side of the pressure roller 32, a reference shaft 122 made of a hexagonal shaft is arranged in parallel to the Y axis, and both ends thereof are rotatably supported by the side plate of the machine body 2a.
FIG. 5 shows a restricting means for restricting the movement of the pressure roller 32 in the direction of escaping due to the pressure applied thereto. The attaching member 124 fixed to the head guide rail 26, the restricting member 126, and the restricting member 126. And a receiving portion 126a composed of a ball bearing rotatably supported at the tip of the lower portion of the head.

The rotation center axis of the receiving portion 126 a is set parallel to the shaft body 122. Between the regulating member 126 and the mounting member 124, a guide mechanism is provided that guides the regulating member 126 in a direction that makes contact with and away from the pressure roller 32 in a plane perpendicular to the shaft body 122. . The regulating member 126 is connected to the mounting member 124 via the guide mechanism so as to be movable in a direction in which the regulating member 126 comes into contact with and separates from the pressure roller 32.

The guide mechanism is composed of an elongated hole provided in the attachment member 124 and screws 128 and 130 which are inserted into the attachment member and attached to the regulating member 126 side. A recess 132 is formed in the restricting member 126, and the recess 132 is movably engaged with the reference shaft body 122.

  A refracting portion 126 b is formed on the rear end side of the lower portion of the regulating member 126, and the refracting portion 126 b faces the refracting portion 124 a formed at the lower portion of the mounting member 124. A screw hole is formed in the refracting portion 124a on the mounting member 124 side, and a screw 134 fitted into the hole formed in the refracting portion on the regulating member 126 side is screwed into the screw hole. A screw hole formed in the refracting portion 124a on the mounting member 124 side, a hole formed in the refracting portion 126b on the regulating member 126 side, and a screw 134 that is fitted into the hole and screwed into the screw hole are attached to the mounting member 124 side. A positioning mechanism for positioning the regulating member 126 at an arbitrary movement position with respect to the member 124 is configured.

A plurality of restricting means including the positioning mechanism are arranged facing the pressure roller 32 in the axial direction.
FIG. 6 shows a forcing means for forcing the bending portion of the pressure roller 32 in the direction of the conveying roller 30, and a plurality of forcing means are arranged facing the axial direction of the pressure roller 32. The forcing means rotates about an axis parallel to the shaft body 122 at the upper end of the mounting member 136 fixed to the head guide rail 26, the coil spring 138, the forcing member 140, the connecting plate 142, and the forcing member 140. It is comprised from the press part 140a which comprises the short shaft type press roller which consists of a ball bearing attached freely.

An intermediate portion of the forcing member 140 is fitted to the shaft body 122 so as to be rotatable in a plane perpendicular to the shaft body 122. The attachment member 136 and the connecting plate 142 are connected by a coil spring 138, and the connecting plate 142 is biased in a direction approaching the pressure roller 32 by the tensile force of the coil spring 138. Between the upper portion of the forcing member 140 and the connecting plate 142, there is provided a slide guide mechanism that guides the forcing member 140 relative to the connecting plate 142 in a direction perpendicular to the reference shaft body 122. Yes.

The slide guide mechanism is composed of a long hole 146 formed in the forcing member 140 and a screw 150 that is fitted into this and screwed into a screw hole formed on the connecting plate 142 side, and the forcing member 140 is formed in this. Along the elongated hole 146, the shaft portion of the screw 150 pivotally supported by the connecting plate 142 is slidable as a fulcrum. The front portion of the cam plate 144 is fixed to the reference shaft body 122 so as to rotate in conjunction with the rotation thereof, and the cam roller 152 attached to the rear portion of the cam plate 144 is attached to the forcing member 140. It is loosely arranged in the formed recess 140c.

A refracting portion 142a formed at the front portion of the connecting plate 142 is opposed to the refracting portion 140b formed at the rear portion of the forcing member 140 with a predetermined interval, and a screw 154 is inserted into a hole formed in the refracting portion 140b. Is inserted, and the screw portion of the screw 154 is screwed into a screw hole formed in the refracting portion 142a. The mounting member 136, the coil spring 138, and the connecting plate 142 constitute a mechanism that applies an urging force to the forcing member 140, and the elongated hole 146, the refracting portions 142 a and 140 b, and the screw 150 are urging forces that act on the forcing member 140. An urging force adjusting mechanism for adjusting the pressure is configured.

The adjustment of the restriction position of the receiving portion 126a of the restriction member 126 relative to the pressure roller 32 and the adjustment of the pressing force of the pressing portion 140a of the forcing member 140 against the pressure roller 32 are performed as shown in FIG. Is lowered to a predetermined position, and one side of the pressure roller 32, which is shifted by a predetermined angle in the circumferential direction with respect to the lowermost part thereof, is placed on and contacted with the surface of the transport roller 30, and the other side is along the Y axis. This is performed in a state of being restricted by a plurality of receiving portions 126a. In this state, the conveyance roller 30 and the plurality of receiving portions 126a constitute a pressure roller holding mechanism.

With the pressure roller holding state in which the left and right side positions are supported by the transport roller 30 and the plurality of receiving portions 126a on the Y axis with respect to the lowermost portion of the circumferential surface of the pressure roller 32, each receiving portion 126a The position of the contact surface with the lower side surface of the pressure roller 32 is adjusted to a line parallel to the reference shaft body 122, that is, the Y-axis, A plurality of adjusted receiving portions 126a are rotatably supported.

To adjust the contact position of each receiving portion 126a with respect to the pressure roller 32, the screw 134 is rotated while the screw 128 is loosened, and the regulating member 126 is moved toward the pressure roller 32 with the reference shaft body 122 as a reference. Then, the receiving portion 126a is brought into close contact with the lower side surface of the pressure roller 32 at an appropriate position. Similarly, the positions of the other receiving portions 126 a with respect to the pressure roller 32 are adjusted with reference to the reference shaft body 122, and the opposing surfaces of all the receiving portions 126 a with respect to the pressure roller 32 are relative to the reference shaft body 122. On a parallel line. When the position adjustment of all the receiving portions 126a is completed, each regulating member 126 is fixed to the mounting member 124 by tightening the screws 128.

  Next, each pressing portion 140 a is pressed downward against the upper surface of the pressure roller 32, and adjustment is performed to forcibly correct the deflection of the pressure roller 32 in the direction of the transport roller 30. In this forcible adjustment, first, the reference shaft body 122 is rotated by a lever operation, the cam plate 144 is rotated, and the pressing force of the cam roller 152 against the forcing member 140 is released.

As a result, the forcing member 140 can rotate freely in the urging direction around the shaft body 122 by the tensile force of the coil spring 138, and the pressing portion 140 a at each tip is pressed against the upper side surface of the pressure roller 32. To do. Due to the pressing force of each pressing portion 140a, the bending of the pressure roller 32 is forcibly corrected, and the pressure roller 32 is in close contact with the conveying roller 30 with a uniform pressure over the entire length. The movement of the pressure roller 32 in the direction of escaping from the pressure from the pressing portion 140a is regulated by the receiving portion 126a. The pressure roller 32 is parallel to the reference shaft body 122 and the surface of the transport roller 30 and each of the pressure rollers 32a. It is supported by the receiving part 126a.

The pressing force of the pressing portion 140a against the pressure roller 32 can be set to an appropriate strength by adjusting the tensile elasticity of the coil spring 138. Adjustment of the pressing force of the pressing portion 140a against the pressure roller 32 is performed by rotating the screw 154. When the screw 154 rotates, the connecting plate 142 is guided by the long hole 146 of the slide guide mechanism and moves in a direction perpendicular to the shaft body 122 along the forcing member 140, and accordingly, the connecting plate of the coil spring 138. The strength of the tensile elasticity with respect to 142 changes.

  As shown in FIG. 3, when the pressure roller 32 is raised with respect to the conveyance roller 30 for setting the print medium 20, the reference shaft body 122 is rotated in the pressure release direction by operating the lever. As a result of this rotation, the cam plate 144 swings in conjunction with the reference shaft body 122 as shown in FIG. 6, and the cam roller 152 pressurizes the bottom surface of the recess 140c of the forcing member 140 and pushes it down. The member 140 is swung clockwise around the reference shaft body 122 in FIG.

As a result, the pressing portion 140a moves up to a predetermined position and moves to the side a predetermined distance from the pressure roller 32. In this state, the pressure roller 32 is moved away from the conveying roller 30 and each receiving portion 126a by lever operation, the printing medium 20 is passed between the conveying roller 30 and the pressure roller 32, and then the lever operation is performed. Thus, the pressure roller 32 is lowered to bring the pressure roller 32 into close contact with the conveying roller 30 and each receiving portion 126a, and further, the reference shaft body 122 is rotated in the pressure direction by a lever operation, whereby the pressing portion 140a. Is pressed against the pressure roller 32 to set the print medium.

In this embodiment, since the pressure roller 32 and the conveyance roller 30 are arranged obliquely, the contact area to the medium is widened and stable conveyance can be performed as compared with the case where the pressure roller 32 and the conveyance roller 30 are installed directly above. Further, although the printing apparatus of the type in which the head moves is described, it can also be used for a structure in which the head does not move, such as a line head, and various printing methods other than the inkjet method. Operations such as pressurization and release of the pressure roller 32 and the forcing member 140 may be performed by a mechanism that moves in series, or may be performed individually by separate mechanisms. Moreover, the structure according to the apparatus may be used for releasing the pressing force on the forcing member 140.

A tension bar mechanism 36 for applying tension to the print medium 20, guide rollers 38 and 40, a flexible split roller mechanism 42, and a guide roller 44 are arranged in the print medium supply / conveyance path section 8. Each guide roller 38, 40, 44 is rotatably supported on the machine body 2a side.

The tension bar mechanism 36 includes a pair of swing arms 66 and a guide roller 68 that is rotatably supported between the arms 66. Each of the pair of swing arms 66 is erected on each leg 2b. It is rotatably supported on the mounting plate side. As shown in FIG. 15, in the flexible split roller mechanism 42, a plurality of (three in the embodiment) pipe-shaped split rollers 72 having the same diameter are loosely fitted on a support shaft 70 extending in the Y-axis direction. .

In the present embodiment, the outer diameter of the support shaft 70 and the inner diameter of the split roller 72 are set to approximately 1: 3 as shown in FIG. 15, but are not particularly limited to this ratio. The ratio between the outer diameter of the roller and the inner diameter of the dividing roller 72 may be arbitrarily changed depending on the structure of the apparatus. The dividing roller 72 has a thickness and a weight that do not deform, and itself serves as a weight. Various values can be set for the weight of the dividing roller depending on the material of the printing medium 20 and the like. The support shaft 70 may be made of various materials, but in the present embodiment, it is composed of an aluminum pipe, and both ends are supported by support plates 74 and 74 fixed on the airframe 2a side. The split roller 72 in this embodiment is formed of a synthetic resin or metal hollow pipe, and a ring-shaped weight 76 is detachably fixed to the outer ends of the left and right split rollers 72.

FIG. 11 shows the configuration of the print medium discharge unit 12. The discharge-side guide roller 78 is disposed in the Y-axis direction so as to cross the front of the support portion 28 over the entire width in the width direction of the print medium 20, and the support shafts 80 projecting from the centers of both ends serve as the support body 84 on the machine body 2 a side. A bearing 86 is rotatably supported. The roller 78 is made of an aluminum pipe, and an aluminum flange 88 is fixed to both ends of the pipe. A hole is formed at the center of the flange 88, and a support shaft 80 is inserted into the hole, and is fixed to the flange 88 with a set screw.

One of the left and right support shafts 80 is connected to the housing 82a of the torque limiter 82 by a set screw or a fixing pin 90, and the rotor 82b of the torque limiter 82 is rotatable to the support shaft 80 via a bearing 92. Are coupled to the pulley 94 fitted to the shaft so as to be interlocked with the rotation direction. An end portion of the support shaft 80 is rotatably fitted to a support body 96 on the machine body 2a side via a bearing 98. The pulley 94 is connected to a pulley (not shown) fixed to the support shaft 64 via an endless belt 100 constituting a belt-type power transmission mechanism.

  The rotor 82 b of the torque limiter 82 is rotatably fitted to the support shaft 80 and rotates in conjunction with the pulley 94. The rotation of the rotor 82b is transmitted to the housing 82a and from the housing 82a to the support shaft 80. The torque limiter 82 disconnects the connection between the rotor 82b and the housing 82a when an overload is applied to the housing 82a side, cuts off the torque transmission from the rotor 82b to the housing 82a, and keeps the load value on the discharge side guide roller 78 side constant. To control. In the present embodiment, the torque limiter 82 uses a contact type based on a coil spring system. However, when the present invention is implemented, the torque limiter is not limited to the torque limiter shown in the figure, and is a non-contact type using a magnet. A torque limiter or other known torque limiters can be used.

  In the present embodiment, the rotation speed of the discharge side guide roller 78 is set to be higher than the rotation speed of the conveyance roller 30, and the rotation speed of the supply side guide roller 46 is also set to be higher than the rotation speed of the conveyance roller 30. . Since the conveying roller 30 and the discharge side and supply side guide rollers 78 and 46 increase the rotational speed given to each by changing the diameter of the pulley on which the belt is applied, the discharge side guide roller 78 and the supply side guide roller 46 are increased. The final peripheral speed is adjusted to be faster. The rotational torque of the discharge side guide roller 78 is set to be smaller than the rotational torque of the transport roller 30, and the rotational torque of the supply side guide roller 46 is also set to be smaller than the rotational torque of the transport roller 30. The rotational speed and the peripheral speed of the discharge side guide roller 78 and the supply side guide roller 46 may be adjusted freely, and are adjusted so that the tensioned state can be maintained as necessary.

On the surface of the pipe of the discharge side guide roller 78 and the supply side guide roller 46, meshing surfaces 78a, 46a are formed in which minute projections meshing with the printing medium 20 are densely arranged. In this embodiment, the meshing surfaces 78a and 46a are formed by spirally winding sandpaper around the pipe surface of the guide roller, as shown in FIG. 13, but there are various meshing surfaces other than sandpaper. A configuration can be employed. Also, sandpaper and other sandpaper and cloth files will deteriorate if they are in use, so in that case only that part needs to be replaced. In the vicinity of the print medium winding unit 16, a flexible split roller mechanism 106 that guides the print medium 20 to a winding shaft is disposed. The flexible split roller mechanism 106 constitutes the print medium discharge / conveyance path section 14 of the apparatus 2.

The split roller structure of the flexible split roller mechanism 106 has the same configuration as that shown in FIG. In this divided roller component, a support shaft (not shown) is supported by the tension bar mechanism 108. The tension bar mechanism 108 includes a pair of arms 110. One end of the arm 110 is rotatably supported by a support on the leg 2b side, and a support shaft of the flexible split roller mechanism 106 is provided on the other end of the arm 110. It is connected.

Next, the operation of this embodiment will be described.
First, the operator sets the print medium roll 20a on the supply shaft 34 and sequentially hangs the print medium 20 pulled out from the print medium roll 20a on the guide rollers 68, 38, and 40, and further, each division of the flexible division roller mechanism 42. After passing through the lower surface of the roller 72, the guide roller 44 and the guide roller 46 are sequentially hung on the guide roller 44 and the guide roller 46 as shown in FIG.

The drawn print medium 20 is further arranged on the support portion 28, is further hung on the discharge-side guide roller 78, is guided to the lower surface of each division roller of the flexible division roller mechanism 106, and then is attached to the shaft body of the print medium winding portion 16. Wrap. Then, by pressing the lever, the pressure roller 32 is lowered and pressed against the conveyance roller 30, and the print medium 20 on the support unit 28 is sandwiched between the conveyance roller 30 and the pressure roller 32. The tension bar mechanism 36 applies tension to the print medium 20 in the print medium supply / conveyance path unit 8, and the tension bar mechanism 108 applies tension to the print medium 20 in the print medium discharge / conveyance path unit 14.

In order to finally make the print medium 20 ready for printing, after the print medium 20 is attached, the feeding devices 48 and 50, the take-up device 104, and the conveying roller 30 are driven to put the print medium 20 in a tensioned state. Since the tension bar mechanisms 36 and 108 are held so as to be swingable up and down, if the print medium 20 is in a tensioned state, the tension bar mechanisms 36 and 108 move upward and sink downward due to the weight. To give.

  Next, the worker connects the external computer device and the printer device 2 via an interface, and turns on the power of the external computer device and the printer device 2. As a result, the external computer device enters a standby state waiting for input of a command from the operator by executing a predetermined program. Further, the print head 24 moves to the origin along the head guide rail 26.

  Next, the operator operates the external computer device to cause the printer device 2 to start printing an image. Accordingly, the controller built in the printer apparatus 2 controls the operation of the print head 24 while changing the relative positional relationship between the print head 24 and the print medium 20 based on the image data output from the external computer apparatus. Then, ink droplets are ejected toward the print medium 20 on the gutter 18.

In the process of printing an image on the print medium 20, the print medium 20 is conveyed from the rear side to the front side of the machine body 2a. The controller intermittently conveys the print medium 20 from the rear side to the front side of the machine body 2a by controlling the operation of the X-axis motor. The controller also controls the operation of the take-up motor of the take-up device 104 to take up the print medium 20 on which the image has been printed. At this time, the winding motor is controlled so that the height of the roller 106 of the flexible split roller mechanism is within a predetermined range (a range in which a load is applied).

In addition, the controller controls the operation of the feed motor so that the height of the guide roller 68 of the tension bar mechanism 36 is within a predetermined range (a range in which a load is applied), so that the print medium roll 20a. , And the print medium 20 is pulled out from the print medium roll 20a. The supply-side guide roller 46 rotates in the clockwise direction in FIG. 10 in the direction opposite to the rotation direction of the conveyance roller 30 to apply tension to the print medium 20 supplied to the conveyance roller 30 and to engage the meshing surface 46a. The print medium 20 acts to extend the wrinkles of the print medium 20 by meshing with the print medium 20.

Next, the operation of the flexible split roller mechanism 42 will be described.
In the print medium supply / conveyance path section 8, the print medium 20 between the guide rollers 44 and 40 is pressed against the lower surface of each of the divided rollers 72, 72, 72 of the flexible divided roller mechanism 42 by the tension applied from the guide roller 68. . Each of the divided rollers 72 is pushed up against its own weight from the initial state of FIG. 16A by the pressure from the print medium 20 in pressure contact with the lower surface, and rotates as the print medium 20 is conveyed.

When the print medium 20 is a cloth, the expansion / contraction rate differs between the middle of the cloth to be conveyed and the end. Therefore, when a force for pulling the cloth is applied, both side portions are easily stretched as compared to the central portion, and if this stretch is left untreated, slacking occurs on both side portions, resulting in defects in wrinkles and conveyance accuracy. However, when both sides of the cloth are extended, the left and right dividing rollers 72 are inclined in accordance with this, and as shown in FIG. 16C, the dividing rollers are in contact with each other according to the state of the printing medium. Become.

The contact according to the state of the print medium at each location of the dividing roller 72 enables the conveyance by contact according to the slack of the both end portions of the print medium 20, and a load is also applied to the slack portion. For this reason, generation of wrinkles and defects in conveyance accuracy are solved. FIG. 16B shows a state in which a printing medium that hardly stretches is used, and shows a state in which all the dividing rollers 72 are pushed up by the cloth pressure, and the whole is linear in the horizontal direction.

The weight 76 is provided to apply a heavier load to the outside of the cloth that is easy to stretch. By attaching a plurality of weights 76 to the outer end portions of the left and right split rollers 72, the weight applied to the end portions of the split rollers 72 can be adjusted in various ways, and various fabrics (easily stretchable, difficult to stretch, etc.) It can be made to correspond. In the case of wrinkles near the center of the width of the print medium in the conveyance on the supply side as shown in FIG. 16D, a weight W may be provided on the middle divided roller so as to extend the portion. When providing a place where the weight is placed on the inner surface of the dividing roller, it is preferable to use a structure in which the weight is attached not only to the central portion but also to the left and right dividing rollers. In that case, it is not necessary to use a ring-shaped weight at the outer end of the split roller. If the structure is provided on the inner surface of the split roller at multiple locations such as the end and the center, for example, only at the end When a weight is inserted, it can be in the same state as a ring-shaped weight provided at the end. The weight need not be provided when the weight of the dividing roller is sufficient. The operation of the flexible split roller mechanism 106 of the print medium discharge / conveyance path section 14 is the same as the operation of the split roller mechanism, and the description thereof is omitted.

Next, the operation of the print medium discharge unit 12 will be described.
By driving the motor of the X-axis drive device, the pulley 94 rotates faster than the conveying roller 30 in the counterclockwise direction in FIG. The rotation of the pulley 94 is transmitted to the rotor 82b of the torque limiter 82, and the rotation of the rotor 82b is transmitted to the support shaft 80 of the discharge side guide roller 78 through the housing 82a.

As a result, the discharge-side guide roller 78 rotates at a faster peripheral speed than the transport roller 30. In front of the support portion 28, the print medium 20 is brought into pressure contact with the meshing surface 78 a of the discharge-side guide roller 78 by a load applied to the cloth by the tension bar mechanism 108, and is conveyed to the discharge side of the apparatus 2 while meshing with the load. When the tension of the print medium 20 between the transport roller 30 and the discharge side guide roller 78 exceeds a predetermined value, the torque transmission blocking function of the torque limiter 82 works and the rotor 82b rotates around the housing 82a. An increase in the tension of the print medium 20 is prevented.

As a result, the tension of the print medium 20 between the transport roller 30 and the discharge-side guide roller 78 is maintained at a predetermined value, so that the print medium in the print range under the print head is also held in a tensioned state. Printing on the print medium is executed and printed neatly.
Since this apparatus often prints on a cloth, it is desirable that the portion after printing on the cloth is not in contact with a platen or the like to be dried. Therefore, the tangent line at the uppermost end of the transport roller 30 and the discharge side guide roller 78 is set so as not to come into contact with the support portion 28 when the print medium is in tension between the transport roller 30 and the discharge side guide roller 78. .

As a result, the air floats in the air until it comes into contact with the discharge-side guide roller 78 after printing by the print head, so that drying is promoted because there is contact with air on both the front surface and the back surface. Further, since there is no contact with other parts in the portion, the printed medium after printing does not get dirty, and the discharge-side guide roller 78 also comes into contact only from the back surface, so the surface does not get dirty.

In addition, since the discharge side guide roller 78 is provided at a place where the conveyance direction of the medium is changed, the cloth is gathered not only on the upper surface portion of the roller but also at a certain distance on the peripheral surface. In the case of a wide print medium, the contact area in the width direction is large, so even a small protrusion such as a sandpaper can hold the print medium without slipping only by contact from the back surface.
In the present embodiment, the discharge medium guide roller is used as the print medium discharge unit. However, the print medium discharge guide unit may be configured so as to be supplied to the take-up roller by conveyance by a normal platen curved. Is not limited to the configuration of the discharge side guide roller.
In this embodiment, the rotation of the supply side guide roller 46 is set in the opposite direction to the rotation of the transport roller 30. It is not limited.

As shown in FIG. 17, the supply-side guide roller may be fixed to the machine body via a torque limiter to enter a stopped state. FIG. 17 shows another embodiment of the print medium supply side guide unit 7, in which the rotor 83 b of the torque limiter 83 is fixed to the support body 85 of the machine body 2 a via the rotation stop plate 63. On the surface of the pipe of the supply side guide roller 46, minute projections that mesh with the printing medium 20 are densely arranged, and thereby an engagement surface 46a is formed. In the present embodiment, the meshing surface 46a is formed by spirally winding sandpaper around the surface of the pipe of the supply side guide roller 46. However, the meshing surface 46a adopts various configurations other than sandpaper. Can do.

A housing 83 a of a torque limiter 83 is connected to one of the left and right support shafts 52 of the supply side guide roller 46 by a set screw or a fixing pin 91. The rotational torque of the supply side guide roller 46 is transmitted to the housing 82a, and is transmitted from the housing 82a to the rotor 83b.
In the present embodiment, the torque limiters 82 and 83 use a contact type by a coil spring method, but a non-contact type torque limiter using a magnet or other known torque limiters can be used.

  In the above-described configuration, when the tension of the printing medium 20 between the transport roller 30 and the supply side guide roller 46 exceeds a predetermined value, the torque transmission blocking function of the torque limiter 83 is activated, and the housing 83a is connected to the rotor 83b. Around the collar, an increase in the tension of the print medium 20 is prevented. As a result, the conveyance force that sandwiches and drives the print medium 20 by the conveyance roller 30 and the pressure roller 32 causes the conveyance to be pulled with a certain load by the supply side guide roller 46, and an appropriate tension state is given to the print medium 20. After the wrinkles are stretched, they are sandwiched between the conveying roller 30 and the pressure roller 32, so that the phenomenon that the wrinkles are generated is suppressed. Therefore, the load by the torque limiter of the supply side guide roller 46 is set to such an extent that no slip occurs in the driving of the conveying roller 30 and the pressure roller 32.

DESCRIPTION OF SYMBOLS 2 Printer apparatus 2a Machine body 2b Leg part 2c Base plate 4 Printing part 6 Print medium conveyance drive part 7 Print medium supply side guide part 8 Print medium supply conveyance path part 10 Print medium supply part 12 Print medium discharge part 14 Print medium discharge conveyance path Unit 16 print medium winding unit 18 gutter 20 print medium 22 head unit 24 print head 26 head guide rail 28 print medium guide unit 30 transport roller 32 pressure roller 34 supply shaft 46 supply side guide roller 48 delivery device 50 delivery device 52 Shaft 54 Pulley 56 Pulley 58 Endless belt 60 Gear 62 Gear 64 Support shaft 78 Discharge side guide roller 80 Support shaft 84 Support body 94 Pulley 100 Endless belt 102 Winding shaft 104 Winding device 106 Flexible split roller mechanism 112 Storage box 114 Storage box 116 Operation panel 120 Short axis B Roller 122 Reference shaft 124 Attachment member 126 Restriction member 126a Receiving portion 126b Refraction portion 128 Screw 130 Screw 132 Recess 134 Screw 136 Attachment member 138 Coil spring 140 Force member 140a Pressing portion 140b Refraction portion 140c Recess 142 Connection plate 140a Refraction portion 144 Cam plate 146 Long hole 150 Screw 152 Cam roller 154 Screw

Claims (25)

An apparatus main body, a printing unit provided in the main body, a cylindrical conveyance roller extending in a width direction with respect to a print medium rotatably supported at a fixed position on the main body, and a print medium A cylindrical pressure roller extending in the width direction, and a print medium conveyance drive unit including a drive unit that rotationally drives the conveyance roller, and both ends of the pressure roller are connected to the main body with respect to the conveyance roller. Movably and rotatably supported in this direction, sandwiching the print medium between the transport roller and the pressure roller, rotating the transport roller to transport the print medium in a predetermined direction, A medium conveying mechanism in a printing apparatus that performs printing on a printing medium by a printing unit, wherein one side of the lower part of the pressure roller is placed on the upper surface of the conveying roller, and the lower part of the pressure roller Set the pressure roller on the other side of The holding means is arranged to hold the pressure roller, and both sides of the lower part press the upper part of the pressure roller held by the restriction means and the conveying roller by the forcing means in the direction of the conveying roller. A medium conveyance mechanism characterized in that the pressure roller is corrected by pressure.   The restricting means includes an attachment member fixed to the fixed side of the main body and a restriction member coupled to the attachment member so as to be movable within a predetermined range, and the lower portion of the pressure roller is received by the restriction member. The medium transport mechanism according to claim 1, further comprising a receiving portion. The medium conveying mechanism according to claim 1, wherein a plurality of the restricting units are arranged to face the axial direction of the pressure roller. The medium conveying mechanism according to claim 1, wherein a plurality of the forcing units are arranged to face each other in the axial direction of the pressure roller. The medium conveying mechanism according to claim 2, wherein the restricting unit is provided with a positioning mechanism that positions the restricting member on the attachment member. The forcing means includes a forcing member that is swingably supported on the fixed side of the main body, and a biasing means that applies a biasing force to the forcing member in a swinging direction. The medium transport mechanism according to claim 1, further comprising a pressing portion that presses the pressure roller.   The medium conveying mechanism according to claim 2, wherein the receiving portion is attached to the restricting member so as to be rotatable about an axis parallel to a rotation center axis of the pressure roller.   The medium transport mechanism according to claim 7, wherein the receiving portion is configured by a ball bearing. A reference shaft extending in a direction perpendicular to the conveyance direction of the print medium is disposed on the apparatus main body so as to face the pressure roller, and the regulating member is disposed on the reference shaft in a direction perpendicular thereto. The medium transport mechanism according to claim 2, wherein the medium transport mechanism is arranged so as to be movable, and the reference shaft body is used as a reference for movement adjustment of the restricting member. A shaft body extending in a direction perpendicular to the conveyance direction of the print medium is disposed on the apparatus main body so as to face the pressure roller, and the forcing member is rotatably fitted to the shaft body. The pressing portion is mounted rotatably about an axis parallel to the rotation center axis of the pressure roller, and the pressing portion is pressed against the upper portion of the pressure roller by an urging force acting on the forcing member. The medium transport mechanism according to claim 6.   The medium transport mechanism according to claim 10, wherein the pressing portion is configured by a ball bearing.   The medium transport mechanism according to claim 6, wherein a biasing force adjusting mechanism is provided in a biasing force applying unit that applies a biasing force to the forcing member.   When the shaft body is rotatably supported by the apparatus main body, a cam plate is fixed to the shaft body, an engagement portion that engages with the forcing member is provided on the cam plate, and the shaft body is rotated, 11. The forcing member is rotated against an urging force by a pressing force from an interlocking cam plate engaging portion, and the pressing portion is separated from the pressure roller. Media transport mechanism.   The medium conveying mechanism according to claim 2, wherein the receiving portion provided on the regulating member is released from contact with the pressure roller when the pressure roller moves upward.   The apparatus main body is provided with a print medium discharge section for guiding the print medium after printing to the print medium discharge side of the apparatus main body, and the discharge medium guide is provided with a meshing surface that engages the print medium on the peripheral surface of the print medium discharge section. A discharge side guide roller driving unit that drives a support shaft of the discharge side guide roller, and a torque limiter that is connected to the support shaft of the discharge side guide roller. If the tension of the printing medium between the conveyance roller and the discharge side guide roller exceeds a predetermined value, the torque transmission from the discharge side guide roller drive unit is cut off by the torque limiter when it is set faster than the peripheral speed of the conveyance roller. The medium transport mechanism according to claim 1, wherein the tension of the print medium is maintained at a predetermined value.   16. The medium conveying mechanism according to claim 15, wherein the meshing surface of the discharge side guide roller is configured such that minute protrusions are densely arranged.   The discharge-side guide roller driving unit is configured by a driving unit that drives the conveyance roller, and the rotation output of the print medium conveyance driving unit is transmitted to the input side of the torque limiter via a power transmission mechanism. The medium transport mechanism according to claim 15.   The medium transport mechanism according to claim 1, wherein the print medium is a sheet material.   The medium transport mechanism according to claim 15, wherein the discharge-side guide roller is provided at a place where a transport direction of the print medium is changed.   A print medium supply unit that rotatably holds a roll-shaped print medium in the apparatus main body, and a print medium supply side guide unit that guides the print medium fed from the print medium supply unit to the print medium conveyance drive unit. A support shaft disposed in a direction crossing the print medium in a print medium supply transport path between the print medium supply unit and the print medium supply side guide unit, and a plurality of hollows loosely fitted on the support shaft The medium conveying mechanism according to claim 1, wherein a flexible dividing roller mechanism including a plurality of dividing rollers is disposed, and the print medium is pressed against a lower peripheral surface of the dividing roller. A printing medium winding unit for winding a printed printing medium on the apparatus main body; and a printing medium discharging unit for guiding the printed medium after printing to the printing medium discharging side of the apparatus main body. A flexible medium comprising a support shaft disposed in a direction crossing the print medium in a print medium discharge conveyance path between the discharge section and the print medium winding section, and a plurality of hollow division rollers loosely fitted on the support shaft. The medium conveying mechanism according to claim 1, wherein a split roller mechanism is disposed, and the print medium is pressed against a lower peripheral surface of the split roller.   The medium transport mechanism according to claim 20 or 21, wherein a weight is attached to at least one of the plurality of divided rollers.   The medium transport mechanism according to claim 20 or 21, wherein the support shaft is attached to a pair of arms that are pivotally supported on the side of the machine body.   The apparatus main body is provided with a print medium supply side guide for guiding the print medium to the print medium conveyance drive unit, and the print medium supply side guide is provided on the peripheral surface with a meshing surface that meshes with the print medium. A roller and a torque limiter coupled to the support shaft of the supply side guide roller, and supports the supply side guide roller so that tension is applied to the print medium moving in the direction of the print medium conveyance drive unit. The tension between the print medium conveyance drive unit of the print medium and the supply side guide roller is maintained at a predetermined value by the torque transmission cutoff operation of the torque limiter. 2. A medium transport mechanism according to 1.   25. The medium conveying mechanism according to claim 24, wherein the meshing surface of the supply side guide roller is configured such that minute protrusions are densely arranged.

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