JP6357080B2 - Rolled medium support mechanism, medium conveying apparatus, and image forming apparatus - Google Patents

Description

  The present invention relates to a roll-shaped medium support mechanism, a medium conveying apparatus, and an image forming apparatus.

  2. Description of the Related Art Conventionally, an image forming apparatus such as a printer, a copier, a facsimile machine, a multi-function machine, for example, a printer capable of printing on a long sheet, a printing unit that forms an image on a sheet (prints) And a paper transport device as a medium transport device for supplying paper to the printing unit.

  The paper transport device includes a paper supply unit that feeds a paper to a paper transport path while rotating a roll paper as a roll-like medium formed by winding a long paper around a paper tube in a roll shape, and a fed paper Is provided along a paper transport path, and is provided with a paper transport unit and the like that are sent to a printing unit. The paper supply unit is provided with a roll holder as a roll-shaped medium support mechanism for supporting roll paper (see, for example, Patent Document 1).

  2 is a perspective view of a conventional roll holder, FIG. 3 is a side view of the conventional roll holder, and FIG. 4 is an exploded perspective view of the conventional roll holder.

  In the figure, reference numeral 20 denotes a roll holder. The roll holder 20 is formed integrally with a boss member 21 that supports a roll paper (not shown) on the inner peripheral surface side of the paper tube, and one end of the boss member 21. With respect to the rib member 23, the boss member 21, and the flange member 22 that are swingably disposed with respect to the boss member 21 at four locations in the circumferential direction of the flange member 22 and the boss member 21 that are brought into contact with the end surface. A wedge-shaped member 24 movably disposed, a spring member 25 disposed in the wedge-shaped member 24, a spring fixing member 26 that presses the spring member 25, and the flange member 22 are swingably disposed. And a set lever member 27 having a cam portion 27a.

  A window portion 21a for exposing each rib member 23 when the wedge-shaped member 24 is inserted into the boss member 21 is formed on the outer peripheral surface of the boss member 21, and the boss member 21 in each window portion 21a is exposed. A bearing portion 21b that rotatably supports the rotation shaft portion 23a of each rib member 23 is formed at the end portion on the distal end side.

  The wedge-shaped member 24 extends in the axial direction at an equal angle to the outer peripheral surface of the cylindrical main body 24a and the end (rear end) on the arrow A direction side of the main body 24a and protrudes. The wedge part 24b formed in this way and the arm part 24c formed to extend in the radial direction at the rear end of the main body part 24a are inserted into the boss member 21. The wedge portion 24b is formed with an inclined surface so as to increase stepwise from the front end side to the rear end side of the main body portion 24a, and the inclined surface can support roll paper having paper tubes having different dimensions. it can.

  Then, the rib member 23 is formed with a retaining projection 23b at the rear end and the rotating shaft portion 23a at the front end, and is bent at a bending portion 23c.

  In addition, a guide slit is formed on the inclined surface of the wedge portion 24b, and the retaining projection 23b side of each rib member 23 is inserted into the guide slit to guide the bent portion 23c.

  Next, the operation of the roll holder 20 will be described.

  5 is a sectional view showing a first state of a conventional roll holder, FIG. 6 is a sectional view showing a second state of the conventional roll holder, and FIG. 7 is a sectional view showing a third state of the conventional roll holder. It is.

  First, when the set lever member 27 (FIG. 2) is rotated so as to form an angle of 90 ° with respect to the end surface of the flange member 22 in a state where the roll paper is not set in the roll holder 20, a wedge-shaped member is obtained. The 24 arm portions 24c are pushed by the cam portion 27a of the set lever member 27, and the wedge-shaped member 24 is moved rearward while compressing the spring member 25.

  At this time, since the bent portion 23c of each rib member 23 is located in the region of the front end of the inclined surface of the wedge portion 24b, each rib member 23 is parallel to the axis of the boss member 21, as shown in FIG. The outer peripheral surface of each rib member 23 is flush with the outer peripheral surface of the boss member 21.

  When the roll paper R having the paper tube q1 having an inner diameter of 2 [inch] is set in the roll holder 20, the boss member 21 is inserted into the paper tube q1 as shown in FIG. When the set lever member 27 is tilted with respect to the end surface of the flange member 22 while being brought into contact with the end surface of the roll paper R, the arm portion 24c of the wedge-shaped member 24 is not pushed by the cam portion 27a of the set lever member 27, and the wedge-shaped member 24 Is moved forward by the urging force of the spring member 25.

  Accordingly, when the bent portion 23c of each rib member 23 is moved upward along the inclined surface of the wedge portion 24b and the abutment against the inner peripheral surface of the paper tube q1, the set lever member 27 is flanged. When the roll holder 20 is rotated so as to be parallel to the end face of the member 22, the roll holder 20 is locked. In this way, the roll paper R can be supported by the roll holder 20.

  Further, when the roll paper R having the paper tube q2 having an inner diameter of 3 [inch] is set in the roll holder 20, the boss member 21 is inserted into the paper tube q2 as shown in FIG. Is inclined with respect to the end face of the flange member 22. When the bent portion 23c of each rib member 23 comes into contact with the inner peripheral surface of the paper tube q2, when the set lever member 27 is rotated so as to be parallel to the end surface of the flange member 22, the roll The holder 20 is locked. In this way, the roll paper R can be supported by the roll holder 20.

JP 2007-290864 A

  However, in the conventional roll holder 20, in order to set the roll paper R, it is necessary to insert the boss member 21 into the paper tubes q1 and q2 and rotate the set lever member 27. The operation for setting the roll holder 20 is troublesome.

  The present invention solves the problems of the conventional roll holder 20 and provides a roll-shaped medium support mechanism, a medium transport apparatus, and an image forming apparatus that can simplify the work for setting a roll-shaped medium. For the purpose.

  Therefore, in the roll-shaped medium support mechanism of the present invention, the end face of the roll-shaped medium to be set is brought into contact with the flange-shaped medium, and is protruded from the first surface of the flange. A medium support portion that is caused to enter and supports the roll-shaped medium.

  The medium support portion includes a plurality of support units disposed adjacent to each other in the circumferential direction of the flange.

Each of the support units is supported in a swingable manner with respect to the fixed portion and the fixed portion, and is rotated when the medium support portion is advanced into the core. A blade to be pressed, and a movable part arranged to be movable with respect to the fixed part.
And the predetermined part of the said blade and the said movable part are made to contact | abut.
Further, the movable part is moved as the blade is rotated.

  According to the present invention, in the roll-shaped medium support mechanism, the flange on which the end surface of the roll-shaped medium to be set is brought into contact is protruded from the first surface of the flange. A medium support portion that is caused to enter and supports the roll-shaped medium.

  The medium support portion includes a plurality of support units disposed adjacent to each other in the circumferential direction of the flange.

Each of the support units is supported in a swingable manner with respect to the fixed portion and the fixed portion, and is rotated when the medium support portion is advanced into the core. A blade to be pressed, and a movable part arranged to be movable with respect to the fixed part.
And the predetermined part of the said blade and the said movable part are made to contact | abut.
Further, the movable part is moved as the blade is rotated.

  In this case, since the tip of the blade is pressed against the inner peripheral surface of the core simply by entering the medium support portion into the core, the work for setting the roll-shaped medium on the roll-shaped medium support mechanism is simplified. Can do.

It is sectional drawing of the roll holder assembly in the state in which the roll paper in embodiment of this invention is not set. It is a perspective view of the conventional roll holder. It is a side view of the conventional roll holder. It is a disassembled perspective view of the conventional roll holder. It is sectional drawing which shows the 1st state of the conventional roll holder. It is sectional drawing which shows the 2nd state of the conventional roll holder. It is sectional drawing which shows the 3rd state of the conventional roll holder. FIG. 2 is a perspective view of a sheet conveying device in an embodiment of the present invention. It is sectional drawing of the paper conveying apparatus in embodiment of this invention. It is a perspective view which shows the principal part of the paper conveying apparatus in embodiment of this invention. It is a 1st perspective view of the roll holder assembly in an embodiment of the invention. It is a top view of the roll holder assembly in an embodiment of the invention. It is a 2nd perspective view of the roll holder assembly in embodiment of this invention. It is a figure for demonstrating the 1st operation | movement of the roll holder assembly at the time of setting the roll paper in embodiment of this invention. It is a figure for demonstrating operation | movement of the roll holder assembly at the time of removing the roll paper in embodiment of this invention. It is a figure for demonstrating the 2nd operation | movement of the roll holder assembly at the time of setting the roll paper in embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this case, a paper conveyance device as a medium conveyance device mounted on a printer as an image forming apparatus will be described.

  FIG. 8 is a perspective view of the sheet conveying apparatus in the embodiment of the present invention, FIG. 9 is a cross-sectional view of the sheet conveying apparatus in the embodiment of the present invention, and FIG. 10 is a main part of the sheet conveying apparatus in the embodiment of the present invention. FIG.

  In the figure, reference numeral 101 denotes a paper transport device. The paper transport device 101 is a roll paper R as a roll medium formed by winding a long paper as a medium around a paper tube q2 as a core in a roll shape. , The paper supply unit 102 that feeds the paper to the paper conveyance path Rt1, the paper conveyance unit 103 that conveys the fed paper along the paper conveyance path Rt1, and sends it to the printing unit (not shown), below the paper supply unit 102 A lower frame 104 or the like as an enclosing body is provided.

  The paper supply unit 102 is disposed so as to extend in the axial direction of the roll paper R, and a roll for supporting the roll paper R at both ends on the frame tray 105 for setting the roll paper R. A roll holder assembly 31 serving as a medium support mechanism, and is arranged to be connected to the roll holder assembly 31 at both ends of the roll holder assembly 31 to hold the roll holder assembly 31 and roll paper R through the roll holder assembly 31. Roll shafts sh1 and sh2 that are rotatably supported, guides 108 and 109 that are disposed on the frame tray 105 and rotatably support the roll shafts sh1 and sh2, a base 107 for attaching the guides 108 and 109, and the like Is provided. Retainer gears g1 and g2 are attached to the ends of the roll shafts sh1 and sh2 on the roll holder assembly 31 side.

  The retainer gears g1 and g2 are engaged with a gear hole 43h formed in the flange 43 of the roll holder assembly 31, whereby the roll paper R is rotatably supported by the shafts sh1 and sh2.

  In this embodiment, one of the guides 108 and 109 is arranged so that the guide 109 corresponds to the width of the paper so that various types of roll paper R having different lengths in the axial direction can be supported. It can be moved to. For this purpose, a pair of short latched portions 111 are formed on one end side of the base 107, and a projection (not shown) as an engaging portion formed by protruding from the bottom surface of the guide 108 is engaged with the slit 111. A slit 112 as a pair of long locked portions is formed on the other end side of the base 107, and a projection (not shown) as a locking portion formed by projecting on the bottom surface of the guide 109 in the slit 112. Is slidably locked. When the paper width is changed by a paper width adjusting mechanism (not shown), the paper width can be detected by detecting the position of the protrusion in the slit 112.

  Reference numeral 125 denotes a support device that movably supports the paper transport device 101. The support device 125 is rotatably supported below the support base 126 for placing the paper transport device 101 and the support base 126. A first caster Cs1 that is disposed and supports the support table 126 movably in the axial direction of the roll paper R; and a second caster Cs1 that supports the support table 126 movably in a direction orthogonal to the axial direction of the roll paper R. A pair of brackets 131 and 132 disposed on the support table 126 so as to extend in the axial direction of the roll paper R, the brackets 131 and 132 are pulled out, the frame tray 105 is pulled out, And slide rails 133, 134 and the like for storage.

  The paper transport unit 103 includes a plurality of transport roller pairs 32 disposed along the paper transport path Rt1 in order to transport the paper fed from the paper supply unit 102. Each conveyance roller pair 32 includes a feed roller 34 as a first roller and an idle roller 35 as a second roller.

  Each feed roller 34 is rotated by driving a paper conveyance motor 38 as a medium conveyance drive unit, and conveys the paper together with the idle roller 35.

  Next, the roll holder assembly 31 will be described.

  FIG. 11 is a first perspective view of a roll holder assembly in the embodiment of the present invention, FIG. 12 is a plan view of the roll holder assembly in the embodiment of the present invention, and FIG. 13 is a roll holder assembly in the embodiment of the present invention. It is a 2nd perspective view of this. The roll holder assembly 31 is disposed so as to be opposed to each other at both ends in the axial direction of the roll paper R. FIG. 11 shows a surface of one roll holder assembly 31 facing the other roll holder assembly 31, that is, a first surface. FIG. 13 is a view of the roll holder assembly 31 as viewed from the surface opposite to the facing surface S1, that is, the non-facing surface S2 as the second surface. It is.

  In the figure, reference numeral 31 denotes a roll holder assembly. The roll holder assembly 31 includes a flange 43 having a substantially disk shape, and a front side (on the opposite roll holder assembly 31 side) from the center portion on the facing surface S1 side of the flange 43. ), And a roll paper support 71 as a medium support for supporting the roll paper R is provided. The facing surface S1 of the flange 43 has a contact surface Sa that is brought into contact with the end surface of the roll paper R when the roll paper R is set on the roll holder assembly 31, and a square shape. The center of the flange 43 on the side of the surface S1 is provided with a support surface Sb that is formed by being displaced by a predetermined distance from the contact surface Sa to the non-opposing surface S2 side and supports the roll paper support part 71. Further, the contact surface Sa is formed with a protrusion 43k projecting forward at a position nearer to the outside in the radial direction than the support surface Sb. In addition, 43h is a gear hole formed by projecting from the non-facing surface S2 at the center of the flange 43.

  The flange 43 is integrally formed with a circular portion 43a and a polygonal portion 43b adjacent to each other in the axial direction. In the present embodiment, the polygonal portion 43b is formed of a hexagon and has a diameter so that the roll paper R does not roll when the roll paper R on which the roll holder assembly 31 is set is placed on a desk or the like. It is formed so as to protrude outward from the outer peripheral surface of the circular portion 43a in the direction.

  Further, the roll paper support 71 swings the core blade 44 as a blade having a substantially rhombus shape at a plurality of locations in the circumferential direction of the flange 43, that is, at four locations in the present embodiment. The roll paper R is supported by being movably provided and the tip tp of each core blade 44 is pressed against the inner peripheral surface of the paper tube q2 (FIG. 9) and bited (abutted).

  For this purpose, the roll paper support portion 71 includes a plurality of, in the present embodiment, four support units ui (i = 1, 2,..., 4) arranged adjacent to each other in the circumferential direction. And an inner plate 50 having a substantially circular shape and connecting the front ends of the support units ui to each other.

  Each support unit ui is formed so as to form an angle of 90 ° with respect to each other in the circumferential direction. Each of the support units ui is fixed to the flange 43, and a first plate 45 serving as a fixing portion that connects the support surface Sb of the flange 43 and the inner plate 50, and the first plate 45 in the axial direction. A second plate 46 serving as a first movable portion disposed so as to be movable with respect to the core blade 44 and connected to the second plate 46, and connected to the second plate 46 in the axial direction. A second movable portion that is movably disposed with respect to one plate 45, extends through the support surface Sb to the non-facing surface S2, and is connected to each other on the non-facing surface S2 side. The third plate 47 is disposed between the core blade 44 and the second plate 46, and urges the core blade 44 toward the second plate 46 with a predetermined urging force. A spring Sp1 as a first urging member to be brought into contact with the plate 46, disposed between the support surface Sb and the second plate 46, and the second plate 46 is attached to the core blade 44 with a predetermined urging force. And a spring Sp2 as a second urging member that urges toward.

  The first plate 45 has a first portion p1 extending between the support surface Sb and the inner plate 50, and a first end p1 at the front end (end portion on the inner plate 50 side) of the first portion p1. A second portion p2 that extends in a direction perpendicular to the portion p1 and is fixed to the inner plate 50 by a screw 52 as a fixing member; and a side edge of the first portion p1 A third portion p3 is provided that extends in a direction perpendicular to the portion p1. A limiter surface SL that restricts the forward movement of the second plate 46 is configured by the rear end surface (end surface on the flange 43 side) of the third portion p3.

  The second plate 46 includes a first part r1 that extends in parallel with the third part p3 of the first plate 45, and a rear end (end on the flange 43 side) of the first part r1. Part) extending in a direction perpendicular to the first part r1, and extending in a direction perpendicular to the second part r2 forming the presser of the spring Sp2 and the second part r2. And a third portion r <b> 3 that is fixed to the third plate 47. The third portion r3 is protruded to the non-facing surface S2 side through the support surface Sb.

  The third plate 47 includes a first portion t1 fixed to the third portion r3 of the second plate 46 on the facing surface S1 side of the flange 43 and a non-facing surface S2 side of the flange 43. A second portion t2 is provided that extends in a direction perpendicular to the first portion t1 and is connected to each other between the support units ui, and an operation portion is formed by the second portion t2.

  44p is a predetermined portion of the core blade 44, in the present embodiment, in the vicinity of the end on the inner plate 50 side, and protrudes toward the first plate 45, and the first plate 45 is A post 44e as a swinging shaft formed by penetrating is an E-ring as a retaining member for preventing the post 44p from coming off the first plate 45, and the core blade 44 swings the post 44p. It is swung as a moving center.

  45p denotes a first post formed by projecting from the third portion p3 of the first plate 45 toward the second plate 46, and 45e denotes the first post 45p as the first plate. The E-ring 46p as a retaining member for preventing the 45 from coming off 45 projects from the third portion r3 of the second plate 46 to the third plate 47 side, and the third plate 47 is The second post 46e formed by penetrating is an E-ring as a retaining member for preventing the second post 46p from coming off from the third plate 47.

  The first post 45p moves in the axial direction of the roll paper support 71 with respect to an oval long groove 45h (FIG. 1), which will be described later, formed in the first portion r1 of the second plate 46. Arranged freely. The distance in the axial direction of the roll paper support portion 71 of the long groove 45h is set slightly longer than the distance that the second plate 46 moves relative to the first plate 45.

  Reference numeral 44u denotes a pin as a first locking member formed by projecting toward the second plate 46 in a predetermined portion of the core blade 44, in the present embodiment, in the vicinity of the tip tp, m1 Is the first plate 45 side from a predetermined portion of the second plate 46, in the present embodiment, from the central edge of the roll paper support portion 71 in the first portion r1 of the second plate 46. Projecting toward the surface of the first plate 45 and penetrating the first plate 45, and the spring Sp1 is a tension piece between the pin 44u and the projecting piece m1. Be set.

  The second and third plates 46 and 47 are connected by a second post 46p and are integrally moved in the axial direction to constitute a plate lock member.

  The parts other than the flange 43, the inner plate 50, and the screw 52 have the same shape, size, and the like in each support unit ui.

  Next, the operation of the roll holder assembly 31 configured as described above will be described.

  First, the roll holder assembly 31 in a state where the roll paper R is not set will be described.

  FIG. 1 is a cross-sectional view of a roll holder assembly in a state where roll paper is not set according to an embodiment of the present invention. 1 is a cross-sectional view taken along the line AA in FIG.

  In the figure, 31 is a roll holder assembly, and 43 is a flange.

  As shown in the drawing, the core blade 44 extends from the vicinity of the post 44p toward the tip tp, and sandwiches the first edge L1 and the post 44p having a predetermined length from the vicinity of the post 44p. A second edge L2 that extends parallel to the edge L1 of the first edge L1 and is shorter than the first edge L1, and a third edge L3 that extends perpendicularly to the first and second edges L1 and L2 in the vicinity of the post 44p. , Fourth and fifth edges L4, L5 extending obliquely from the end of the second edge L2 toward the tip tp, and a sixth edge L6 extending between the first and third edges L1, L3. Have Note that the angle formed by the second edge L2 and the fifth edge L5 is larger than the angle formed by the second edge L2 and the fourth edge L4. Further, R (R) is formed between the fourth and fifth edges L4 and L5 so that no edge is formed between the fourth edge L4 and the fifth edge L5.

  When the roll paper R is not set in the roll holder assembly 31, that is, in the initial state of the roll holder assembly 31, the support surface Sb and the second portion r2 of the second plate 46 are in each support unit ui. The second plate 46 is pushed forward (the leading end side of the roll paper support 71) by the urging force of the spring Sp2 disposed therebetween, and accordingly, the third plate 47 (FIG. 11) is also moved forward. When the second portion r2 of the second plate 46 is pressed against the limiter surface SL of the third portion p3 of the first plate 45, the further forward movement of the second plate 46 is restricted. Is done. The position where the forward movement of the second plate 46 is restricted is the initial position.

  Then, the front corner portion eg of the first portion r1 of the second plate 46 is brought into contact with the fourth edge L4, and the core blade 44 is pushed, thereby placing the core blade 44 in an open state. The tip tp is directed radially outward of the roll paper support 71, and the angle of the core blade 44 with respect to the central axis, that is, the inclination of the core blade 44 is maximized.

At this time, the diameter of the circle connecting the tip tp of the core blade 44 of each support unit ui is:
3 [inch] = 76.2 [mm]
Made slightly larger.

  Next, the operation of the roll holder assembly 31 when setting the roll paper R having the paper tube q2 having an inner diameter of 3 [inch] will be described.

  FIG. 14 is a view for explaining a first operation of the roll holder assembly when setting the roll paper in the embodiment of the present invention. 14A is a first diagram for explaining the operation of the roll holder assembly when setting the roll paper, and FIG. 14B shows the operation of the roll holder assembly when setting the roll paper. It is the 2nd figure for doing.

  In the state in which the roll paper R is not set, as shown in FIG. 1, the second plate 46 is placed in the initial position, and the core blade 44 is placed in the open state. At this time, the front corner portion eg of the first portion r1 of the second plate 46 is brought into contact with the fourth edge L4 of the core blade 44. The first post 45p of the first plate 45 is also placed at the initial position at or near the rear end of the long groove 45h.

  When the roll paper R is set in the roll holder assembly 31, as shown in FIG. 14A, the roll holder assembly 31 is advanced in the direction of arrow B, and the front end portion of the roll paper support portion 71 is moved to the roll paper R. When the paper tube q2 is entered, the first edge L1 of the core blade 44 of each support unit ui hits the inner peripheral edge of the end surface of the paper tube q2.

  Subsequently, when the roll holder assembly 31 is further advanced, the core blade 44 of each support unit ui is rotated in the direction of arrow C, and as shown in FIG. It is made to enter the pipe q2, and the tip tp bites into the inner peripheral surface Sin of the paper pipe q2. Then, as the tip tp of the core blade 44 enters the paper tube q2, the core blade 44 is placed in a closed state, and the tip tp is brought closer to the central axis of the roll paper support portion 71. The inclination of is reduced. Further, the front corner portion eg of the first portion r1 of the second plate 46 is brought into contact with the fifth edge L5 of the core blade 44. In this case, since R is formed between the fourth and fifth edges L4 and L5, the inclination of the core blade 44 can be changed smoothly.

  Subsequently, as the core blade 44 rotates, the second plate 46 is pushed (moved) toward the rear (flange 43 side), and the spring Sp2 is compressed by the second portion r2 while the distance is compressed. It is moved backward by x1. The third plate 47 is also retracted by the distance x1.

  Then, the second portion r2 of the second plate 46 is separated from the limiter surface SL by the distance x1, and the first post 45p is moved forward from the initial position by the distance x1 in the long groove 45h.

  At this time, the diameter of the circle connecting the tip tp of the core blade 44 of each support unit ui coincides with the inner diameter of the paper tube q2. The second plate 46 is always urged forward by the urging force of the spring Sp2, whereby the roll paper support 71 is press-fitted into the paper tube q2, and the tip tp of the core blade 44 is moved to the paper tube q2. I bite into the inner peripheral surface Sin. In this way, the paper tube q2 is supported by the roll holder assembly 31. Note that the urging force of the spring Sp <b> 2 is larger than the urging force that urges the spring Sp <b> 1 in the direction to close the core blade 44.

  When the end surface of the roll paper R is brought into contact with the facing surface S <b> 1 of the flange 43, the roll paper R is set on the roll holder assembly 31.

In this case, the diameter of the circle connecting the outer peripheral edges of the first plate 45 of each support unit ui is:
2 [inch] = 50.8 [mm]
Therefore, the core blade 44 does not exist in the vicinity of the end surface of the paper tube q2, and the roll holder assembly 31 may rattle. However, in the present embodiment, the protrusion 43k is formed on the contact surface Sa of the flange 43. Is formed so as to protrude toward the inside of the paper tube q2, and the flange 43 can prevent the roll holder assembly 31 from rattling.

  Next, the operation of the roll holder assembly 31 when removing the roll paper R having the paper tube q2 having an inner diameter of 3 [inch] will be described.

  FIG. 15 is a view for explaining the operation of the roll holder assembly when removing the roll paper in the embodiment of the present invention. 15A is a first diagram for explaining the operation of the roll holder assembly when removing the roll paper, and FIG. 15B is for explaining the operation of the roll holder assembly when removing the roll paper. FIG. 15C is a third diagram for explaining the operation of the roll holder assembly when the roll paper is removed.

  As shown in FIG. 15A, in a state where the roll paper R is set on the roll holder assembly 31 and the tip tp of the core blade 44 bites into the inner peripheral surface Sin of the paper tube q2, FIG. As shown, when the second portion t2 of the third plate 47 is pulled in the direction of arrow D (outside of the flange 43), the second plate 46 compresses the spring Sp2 by the second portion r2, It is retracted together with the third plate 47.

  As a result, the first portion r1 of the second plate 46 is retracted, so that the core blade 44 of each support unit ui is rotated in the direction of arrow E by the urging force of the spring Sp1 (FIG. 11), and the pointed end. tp leaves the inner peripheral surface Sin of the paper tube q2.

  Then, the roll paper R can be removed from the roll holder assembly 31 by pulling out the roll holder assembly 31 in this state.

  In this manner, simply pulling the second portion t2 of the third plate 47 causes the core blade 44 of each support unit ui to rotate in the direction of arrow E, and the tip tp moves from the inner peripheral surface Sin of the paper tube q2. Since they are separated, the roll paper R can be easily removed from the roll holder assembly 31.

  Next, the operation of the roll holder assembly 31 when setting the roll paper R having the paper tube q1 having an inner diameter of 2 [inch] will be described.

  FIG. 16 is a view for explaining a second operation of the roll holder assembly when setting the roll paper in the embodiment of the present invention. FIG. 16A is a first diagram for explaining the operation of the roll holder assembly when setting the roll paper, and FIG. 16B shows the operation of the roll holder assembly when setting the roll paper. It is the 2nd figure for doing.

  In the state in which the roll paper R is not set, as shown in FIG. 1, the second plate 46 is placed in the initial position, and the core blade 44 is placed in the open state. At this time, the front corner portion eg of the first portion r1 of the second plate 46 is brought into contact with the fourth edge L4 of the core blade 44.

  When the roll paper R is set on the roll holder assembly 31, as shown in FIG. 16A, the roll holder assembly 31 is advanced in the direction of arrow F, and the front end portion of the roll paper support portion 71 is moved to the roll paper R. When the paper tube q1 is entered, the first edge L1 of the core blade 44 of each support unit ui hits the inner peripheral edge of the end surface of the paper tube q1.

  Subsequently, when the roll holder assembly 31 is further advanced, as shown in FIG. 16B, the core blade 44 of each support unit ui is rotated in the direction of arrow G, and the tip tp of the core blade 44 is moved to the paper tube. It is made to enter q1, and the tip tp bites into the inner peripheral surface Sin of the paper tube q1.

  As the core blade 44 rotates, the second plate 46 is pushed rearward (to the flange 43 side), and is retracted by the distance x2 while compressing the spring Sp2 by the second portion r2. The third plate 47 is also retracted by the distance x2.

  Further, the second portion r2 of the second plate 46 is separated from the limiter surface SL by a distance x2, and the first post 45p is moved forward from the initial position by a distance x2 in the long groove 45h.

  At this time, the diameter of the circle connecting the tip tp of the core blade 44 of each support unit ui coincides with the inner diameter of the paper tube q1. Then, the second plate 46 is always urged forward by the urging force of the spring Sp2, whereby the roll paper support 71 is press-fitted into the paper tube q1, and the tip tp of the core blade 44 is moved to the paper tube q1. I bite into the inner peripheral surface Sin. In this way, the paper tube q1 is supported by the roll holder assembly 31.

  When the end surface of the roll paper R is brought into contact with the facing surface S <b> 1 of the flange 43, the roll paper R is set on the roll holder assembly 31.

  As described above, in the present embodiment, the point tp of the core blade 44 is changed to the paper tube q1, by the biasing force of the second spring Sp2, simply by causing the roll paper support portion 71 to enter the paper tubes q1, q2. Since it is pressed against the inner peripheral surface Sin of q2, the work for setting the roll paper R on the roll holder assembly 31 can be simplified.

  Further, since the core blade 44 is swingably supported with respect to the first plate 45, the core blade 44 can be rotated according to the inner diameter of the paper tubes q1 and q2 of the roll paper R. Therefore, not only paper tubes having different inner diameters, that is, paper tubes q1 of 2 [inch] and paper tubes q2 of 3 [inch], but also paper tubes of 2 [inch] or more and 3 [inch] or less are provided. The roll paper R can be set on the roll holder assembly 31.

  Furthermore, since the roll paper R is supported by pressing the tip tp of the core blade 44 against the inner peripheral surface Sin of the paper tubes q1 and q2, the supporting force of the roll paper R by the roll holder assembly 31 should be sufficiently increased. Can do.

  In the present embodiment, the roll holder assembly 31 of the paper conveyance device 101 mounted on the printer is described. However, the present invention is applied to a roll holder assembly for winding the roll paper R around the paper tubes q1 and q2. It can be applied to a rewinder mechanism as a medium winding device, a label scraping mechanism, or the like.

  In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.

31 Roll holder assembly 43 Flange 44 Core blade 45 First plate 71 Roll paper support part q1, q2 Paper tube R Roll paper Sin Inner peripheral surface S1 Opposing surface tp Pointed end ui Support unit

Claims (7)

(A) a flange against which an end face of the roll-shaped medium to be set is brought into contact;
(B) having a medium support part that protrudes from the first surface of the flange and that enters the core of the roll medium and supports the roll medium;
(C) The medium support portion includes a plurality of support units disposed adjacent to each other in the circumferential direction of the flange,
(D) Each support unit is supported so as to be swingable with respect to the fixed portion and the fixed portion , and is rotated when the medium support portion is caused to enter the core, and the tip is an inner peripheral surface of the core. A blade pressed against the fixed portion, and a movable portion that is movably disposed with respect to the fixed portion ,
(E) a predetermined part of the blade and the movable part are brought into contact with each other;
(F) A roll-like medium support mechanism, wherein the movable part is moved as the blade is rotated . In the initial state of the roll-shaped medium support mechanism, the blade has its tip pointed radially outward to maximize the inclination, and the inclination of the blade decreases as the medium support portion enters the core. Item 2. The roll medium support mechanism according to Item 1 . Before SL is disposed between the blade and the fixed portion, a roll-shaped medium support mechanism as claimed in claim 1 or 2 having a first biasing member for biasing the blade to the movable portion. The roll-shaped medium support mechanism according to claim 3 , further comprising a second urging member that is disposed between the movable portion and the flange and urges the movable portion toward the blade. The roll shape according to any one of claims 1 to 4 , wherein the movable portion extends through the flange to the second surface side of the flange and forms an operation portion on the second surface side. Media support mechanism. Claim 1 medium transport device roll-shaped medium support mechanism is mounted according to any one of 5. An image forming apparatus on which the medium carrying device according to claim 6 is mounted.

Images