JP4779930B2 - Printing device - Google Patents

Description

  The present invention relates to a printing apparatus, and more particularly to a printing apparatus that stores recording media in a stacked state in a miniaturized main body case.

Conventionally, various printing apparatuses that store recording media in a stacked state in a miniaturized main body case have been proposed.
For example, paper stored in a stacked state in the main body case is printed by the print head, and a pair of rotations provided on both sides of the lid body with respect to the pair of rotation holes provided on both sides of the main body case. By engaging the protrusions of the movable support members, the lid body is rotatable with respect to the main body case, and the lid body is a resin back surface member provided with a rotation support member; There is a printing apparatus including a metal surface member that covers a resin back surface member in a state in which a rotation support member is projected (see, for example, Patent Document 1).
Japanese Patent Laying-Open No. 2003-320730 (paragraphs (0025) to (0077), FIGS. 1 to 23)

  However, in the configuration described in Patent Document 1 described above, when the thickness of the printing apparatus is maintained as it is and the size of the paper is increased, the lid becomes larger, so that the protrusion is provided on the resin back member. Then, the mechanical strength of the pair of rotation support members engaged in the rotation holes provided on both sides of the main body case is insufficient, and the rotation support member is easy when a large force is applied when opening the lid. There is a problem of breaking. Moreover, since a pair of rotation support member is the state exposed to the external appearance surface, there exists a problem that a design freedom degree is restrict | limited and an appearance worsens.

  Therefore, the present invention has been made to solve the above-described problems, and when the thickness of the printing apparatus is maintained as it is, the size of the recording medium is increased, and the lid member is enlarged. It is an object of the present invention to provide a printing apparatus that can increase the strength of the pivot fulcrum portion of the lid member and can avoid the destruction of the pivot fulcrum portion of the lid member. It is another object of the present invention to provide a printing apparatus in which the rotation fulcrum portion of the lid member is not exposed to the external surface of the printing apparatus, and design freedom can be ensured.

In order to achieve the above object, a printing apparatus according to claim 1 is provided with a storage portion that opens to one surface side of a main body case and stores recording media in a stacked state, and is provided in the main body case so as to be opened and closed. And a lid member that covers the main body case, the main body case is disposed at both corners of the rear end of the main body case, and the lower end side thereof is pivotally supported in the recording medium conveyance direction, and the upper end side A pair of link members in which a through-hole is formed in a direction perpendicular to the rotation direction and an upper end portion of the through-hole is cut out along an axial direction of the through-hole to form a shaft insertion portion; A pair of torsion coil springs disposed adjacent to each link member and biasing the lid member to rotate outwardly; and disposed adjacent to each torsion coil spring; and Conveys the recording medium from the center of rotation A pair of engaging portions provided so as to be positioned on the downstream side, and the lid member in the recording medium conveyance direction at a position facing the link members at both corners on the rear end side of the inner surface. A pair of locking shafts arranged along a right angle direction, and a predetermined length downward from the rear end edge of the inner surface so as to face each of the engaging portions, and further, a lower end A pair of first locking pieces that extend perpendicularly to the downstream side in the recording medium conveyance direction and are formed in an L shape in a side view, and each of the locking shafts has each of the locking shafts. through the shaft insertion portion of the member while being detachably attached to the through-hole of the link member is rotated in an outward direction by the pair of torsion coil springs, by the pair of torsion coil springs around this locking shaft Turned toward the main body case against the drag and contacted with the main body case, then recorded By sliding the body conveying direction downstream side, each first locking piece lower portion is engaged with the respective engaging portions of the lid member is in a fixed state Rutotomoni, wherein each link member is a recording medium Rotating downstream in the transport direction, each locking shaft is positioned downstream of the torsion coil spring in the recording medium transport direction with respect to the coil center axis , and the lid member is fixed to the upstream side in the transport direction of the recording medium. And the recording medium can be loaded , and each link member is rotated upstream in the recording medium conveyance direction, and each locking shaft is a coil of the torsion coil spring. It is located upstream of the central axis in the recording medium conveyance direction .

According to a second aspect of the present invention, in the printing apparatus according to the first aspect, the main body case projects inward from both inner side wall portions of the link members on the downstream side in the recording medium conveyance direction. A pair of engaging projections, and the lid member is vertically suspended from the inner surface by a predetermined length so as to oppose each of the engagement projections, and further transports the recording medium from the lower end portion. A pair of second locking pieces that extend perpendicularly to the downstream side in the direction and are formed in an L shape in a side view, and each of the second locking pieces has the lid member around the locking shaft. A lower end portion of each second locking piece is rotated against the resistance of the pair of torsion coil springs and is brought into contact with the main body case and then slides downstream in the recording medium conveyance direction. Are engaged with the respective engaging projections, and the lid member is slid upstream in the recording medium conveyance direction. Becomes an open state by, characterized in that it allows mounting the recording medium.

The printing apparatus according to claim 3 is the printing apparatus according to claim 1 or 2, wherein the main body case has a metal base member to which the torsion coil springs are attached, and the lid member is A resin surface member, and a metal reinforcing plate fixed to the inner surface of the resin surface member, wherein each of the engaging portions is formed on the metal base member, The piece is formed on the metal reinforcing plate.

  According to a fourth aspect of the present invention, there is provided the printing apparatus according to the third aspect, wherein each of the second locking pieces is formed on the metal reinforcing plate.

The printing apparatus according to claim 5, in the printing apparatus according to claim 3 or claim 4, before Symbol each torsion coil spring, the rotation stopper portion for regulating the opening angle of the torsion coil spring of the metallic base member When the lid member is opened, the rear lower edge of the lid member comes into contact with the rear surface portion of the main body case, and the torsion coil springs It is characterized in that it abuts on the inner surface of the lid member at an opening angle smaller than the state where it abuts on the part.

  In the printing apparatus according to claim 1, the lid member is formed by cutting the locking shafts provided at both corners on the rear end side of the inner side surface at the upper ends of the link members disposed at the corners on the rear end of the main body case. Since it is detachably attached to the through hole of the link member via the notched shaft insertion portion, the thickness of the printing apparatus is maintained as it is, the size of the recording medium is increased, and the lid member is enlarged. However, since the rotation fulcrum portion is formed by the engagement between each locking shaft and each link member, sufficient strength can be provided. Further, since each locking shaft of the lid member is detachably attached to the through hole of each link member of the main body case via the shaft insertion portion, when a large rotational force is applied to the opened lid member, Each locking shaft is removed from the through hole of each link member, so that it is possible to avoid the breakage of the rotation fulcrum portion of the lid member.

Further, the lid member rotated outward by a pair of torsion coil springs arranged adjacent to each link member is rotated toward the body case side against the drag force of the pair of torsion coil springs around each locking shaft. The lower end of each first locking piece provided on the rear edge of the inner surface of the lid member is moved by sliding to the downstream side in the recording medium conveyance direction after moving and contacting the main body case. The lid member is fixed by being engaged with each engaging portion provided adjacent to each torsion coil spring and positioned downstream of the rotation center of each link member in the recording medium conveyance direction. To be. As a result, when the lid member is closed, each link member, each locking shaft, each torsion coil spring , each engaging portion and each first locking piece is not exposed to the external surface, and the design freedom is increased. It can be secured.
Further, by sliding the lid member to the upstream side in the recording medium conveyance direction, it becomes an openable state, and the recording medium can be mounted, so even if the size of the recording medium is increased and the lid member is enlarged, It is possible to reduce the thickness of the printing apparatus.
Further, when the lid member is brought into contact with the main body case and then slid downstream in the recording medium conveyance direction, each link member is rotated downstream in the recording medium conveyance direction, and each locking shaft is It is located downstream of the coil central axis of the torsion coil spring in the recording medium conveyance direction. Further, when the lid member is slid from the fixed state to the upstream side in the recording medium conveyance direction, each link member is rotated to the upstream side in the recording medium conveyance direction, and each locking shaft is connected to each torsion coil spring. It is located upstream of the coil center axis in the recording medium conveyance direction.
As a result, when the lid member is closed and fixed, each locking shaft is positioned downstream of the coil central axis of each torsion coil spring in the recording medium conveyance direction. When the coil spring approaches the operating point of the coil spring, the rotational moment acting on each locking shaft of the lid member becomes small, and it becomes possible to prevent the lid member from being lifted. Further, when the lid member is slid from the fixed state to the upstream side in the recording medium conveyance direction, each locking shaft is positioned upstream of the coil center axis of each torsion coil spring in the recording medium conveyance direction. The locking shaft moves away from the point of action of each torsion coil spring, and the rotational moment acting around each locking shaft of the lid member increases, so that the opening force of the lid member can be increased.

Further, in the printing apparatus according to claim 2, the lid member rotated outward by the pair of torsion coil springs is rotated toward the main body case side against the drag force of the pair of torsion coil springs about each locking shaft. Then, after coming into contact with the main body case, each second locking piece provided on the inner surface of the lid member is slid to the downstream side in the recording medium conveyance direction, so that the recording medium conveyance direction of each link member The lid member is brought into a fixed state by being engaged with a pair of engaging convex portions protruding inward from both inner side wall portions on the downstream side. As a result, when the lid member is closed, each second locking piece is engaged with each engagement convex portion, so that it is possible to reliably prevent the side surface portions of the lid member from being lifted.
In addition, since the lid member can be opened by sliding the cover member upstream in the recording medium conveyance direction and the recording medium can be mounted, even if each second locking piece is provided on the lid member, It is possible to reduce the thickness dimension.

In the printing apparatus according to claim 3, the main body case is formed with each engagement portion on a metal base member to which each torsion coil spring is attached. The lid member has a first reinforcing piece formed on a metal reinforcing plate fixed to the inner surface of the resin surface member. For this reason, the lid member is rotated toward the main body case against the drag force of the pair of torsion coil springs around the respective locking shafts, contacts the main body case, and then slides downstream in the recording medium conveyance direction. Thereby, each 1st locking piece formed in the metal reinforcement board is engaged with each engaging part formed in the metal base member.
Thereby, even if the weight increases with the increase in size of the lid member and the drag of each torsion coil spring increases, each first locking piece and each engaging portion are made of metal. It becomes possible to reliably prevent the lid member from being deformed.

  Further, in the printing apparatus according to claim 4, since each second locking piece is formed on a metal reinforcing plate fixed to the inner surface of the resin surface member of the lid member, each first locking piece. At the same time, press molding can be performed, and the number of parts can be reduced.

Furthermore, in the printing apparatus according to claim 5, each I Gigli coil spring, mounted in contact with the rotation stopper portion for regulating the opening angle of the torsion coil spring metal base member provided in the main body case Therefore, the deformation of the main body case and the lid member due to the reaction force of each torsion coil spring can be reliably prevented. In addition, since each torsion coil spring is attached to a metal base member whose opening angle is restricted, when each locking shaft of the lid member is attached to the through hole of each link member, the standby position of each torsion coil spring Therefore, it is possible to smoothly attach and detach the lid member.
Further, when the lid member is opened, the rear lower edge of the lid member abuts on the rear surface portion of the main body case, and the torsion coil springs are smaller than the state abutted on the rotation stop portion. It contacts the inner surface of the lid member at an opening angle. As a result, when the lid member is opened, the maximum open state in which the rear lower edge of the lid member is in contact with the rear surface portion of the main body case can be reliably maintained, and the recording medium can be easily mounted. can do.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a printing apparatus according to the present invention will be described in detail with reference to the drawings based on an embodiment embodying the present invention.

First, a schematic configuration of the printing apparatus according to the present embodiment will be described with reference to FIGS. 1 to 3.
As shown in FIGS. 1 to 3, the printing apparatus 1 has a substantially rectangular shape in plan view, a size of about A5 size in plan view, a thickness of about 2 cm, and an open top surface. The main body case 2 is provided. On the upper surface of the main body case 2, a substantially rectangular fixed cover portion 3 that covers the upper surface of the main body case is provided near one end in the longitudinal direction of the main body case 2. In the main body case 2 excluding the fixed cover portion 3, a housing portion 5 is formed that can accommodate a paper package 8 containing a plurality of paper sheets 7 as A6 size cut sheet recording media made of thermal paper. Has been. A printing mechanism unit (not shown) is provided inside the main body case 2 covered with the fixed cover unit 3.

A case cover 4 is provided so as to cover the storage unit 5. The case cover 4 includes a right link unit 9 provided at the right corner of the rear end of the main body case 2 and a left link unit 10 provided at the left corner of the rear end of the main case 2 as described below. It is detachably attached to the case 2 (see FIG. 14).
Further, on the free end side of the case cover 4, when the case cover 4 is closed, a pressing plate that presses the upper end portion of the stacked sheets 7 and presses against a pickup roller (not shown) by the coil springs 19 and 19. 20 is provided.

When the case cover 4 is opened, the case cover 4 is slid in a direction away from the fixed cover portion 3 as shown in FIGS. 2 (A) → (B) → (C). 4 is disengaged and is rotated outward by the right torsion coil spring 16A of the right link unit 9 and the left torsion coil spring 16B of the left link unit 10 so as to be opened. .
When the case cover 4 is closed, as shown in FIGS. 2 (C) → (B) → (A), the case cover 4 is attached to the main body case 2 against the urging force of the torsion coil springs 16A and 16B. The locking pieces 12 to 15 are engaged and closed by abutting and sliding in the direction of the fixed cover portion 3. In addition, a predetermined gap is formed between the case cover 4 and the fixed cover portion 3, and a discharge port 18 through which the printed paper 7 is discharged is provided.

Next, schematic configurations of the right link unit 9 and the left link unit 10 will be described with reference to FIGS. 4 and 5.
First, a schematic configuration of the right link unit 9 will be described with reference to FIG.
As shown in FIG. 4, the right link unit 9 includes a steel plate right base member 24 (in the present embodiment, a steel plate such as SPCC having a thickness of about 1 mm) and a resin such as polyacetal. The U-shaped link member 25 and the right side torsion coil spring 16A.

  The right base member 24 has an elongated flat plate portion 26 having a width substantially the same as the width of the link member 25, and extends vertically upward from both sides of the rear end of the flat plate portion 26, and further extends rearward to each through hole. Each link member attaching part 28 in which 27 is perforated is formed by bending. Further, the right base member 24 extends from the upper end edge of the inner link member mounting portion 28 in a direction perpendicular to the right side (in the right direction in FIG. 4) to a length substantially equal to the length of the right torsion coil spring 16A. A spring receiving portion 29 and a base end portion of the spring receiving portion 29 are extended in a right-angled upward direction, and further extended from the upper end portion in a right-angle outward direction by a predetermined length (in the right direction in FIG. 4). The opening angle restricting portion 30 and the right torsion coil spring 16 </ b> A are inserted from the substantially central portion in the height direction of the opening angle restricting portion 30 in a direction perpendicular to the predetermined length (in the right direction in FIG. 4). A coil mounting portion 31 is formed. Further, the right base member 24 extends from the longitudinal edge of the spring receiving portion 29 in the upper right direction, and further extends outward from the upper end by a predetermined length at a right angle (in the right direction in FIG. 4). The extending engaging portion 32 is bent. Further, the flat plate portion 26 of the right base member 24 is provided with through holes 26A and 26B through which the screws 23 are inserted. The through hole 26 </ b> B is formed as a horizontally long hole that is long in the longitudinal direction of the flat plate portion 26.

Further, the link member 25 has through-holes 35 formed so as to be opposed to the side portions at the lower end portion, and the right base member is inserted through shafts 36 inserted into the through-holes 27 of the right base member 24. It is attached to 24 so that it can rotate in the front-back direction. The link member 25 has through holes 37 formed so as to face the side portions of the upper end portion, and the upper end portions of the through holes 37 are notched along the axial direction to insert the shafts. A portion 38 is formed. Each guide portion 39 is formed so as to extend obliquely outward from the outer end edge portion of each shaft insertion portion 38. Each through hole 37 is formed to have a diameter substantially the same as the diameter of each locking shaft 62 (see FIG. 12) provided at both corners of the rear end of the case cover 4.
The right torsion coil spring 16 </ b> A is inserted through the coil mounting portion 31 of the right base member 24, and one end edge portion is in contact with the spring receiving portion 29, and the other end portion is the opening angle restriction portion 30. Is attached to the right base member 24 at an opening angle smaller than the maximum opening angle. Further, the other end edge portion of the right torsion coil spring 16 </ b> A that is in contact with the opening angle restricting portion 30 is bent inward in an arc shape in order to contact the inner surface of the case cover 4.

Next, a schematic configuration of the left link unit 10 will be described with reference to FIG.
As shown in FIG. 5, the left link unit 10 is made of a steel plate left side base member 41 (in the present embodiment, made of steel plate such as SPCC having a thickness of about 1 mm to 2 mm) and a resin such as polyacetal. It is composed of a U-shaped link member 25 and a left torsion coil spring 16B.

  The left base member 41 has an elongated flat plate portion 42 having substantially the same width as that of the link member 25, and extends vertically upward from both sides of the rear end of the flat plate portion 42, and further extends rearward to each through hole. Each link member attaching part 44 in which 43 is perforated is formed by bending. Further, the left base member 41 extends from the upper end edge of the inner link member mounting portion 44 in a direction perpendicular to the right side (in the left direction in FIG. 5) to a length substantially equal to the length of the left torsion coil spring 16B. A spring receiving portion 45 and a base end portion of the spring receiving portion 45 extend in a direction perpendicular to the upper side, and further, extend from the upper end portion in a right angle outward direction by a predetermined length (in the left direction in FIG. 5). An opening angle restricting portion 46 and a left torsion coil spring 16 </ b> B are inserted from a substantially central portion in the height direction of the opening angle restricting portion 46 in a direction perpendicular to the predetermined length (in the left direction in FIG. 5). A coil mounting portion 47 is formed. Further, the left base member 41 extends from the longitudinal edge of the spring receiving portion 45 in the upper right direction, and further extends outward from the upper end by a predetermined length at a right angle (the left direction in FIG. 5). The extending engaging portion 48 is bent. The flat plate portion 42 of the left base member 41 is provided with through holes 42A and 42B through which the screws 23 are inserted. The through hole 42 </ b> B is formed as a horizontally long hole that is long in the longitudinal direction of the flat plate portion 42.

The link member 25 is attached to the left base member 41 so as to be pivotable in the front-rear direction, with the shaft 36 inserted into each through-hole 43 of the left base member 41 being inserted into each through-hole 35.
Further, the left torsion coil spring 16B is inserted into the coil mounting portion 47 of the left base member 41 so that one end edge is in contact with the spring receiving portion 45 and the other end is open angle restricting portion 46. Is attached to the left base member 41 at an opening angle smaller than the maximum opening angle. The other end edge portion of the left torsion coil spring 16B that is in contact with the opening angle restricting portion 46 is in contact with the inner surface of the case cover 4 and is bent inward in an arc shape.

Next, since the attachment of the right link unit 9 and the left link unit 10 to the main body case 2 has substantially the same configuration, the attachment of the right link unit 9 to the main body case 2 will be described with reference to FIGS. To do.
As shown in FIGS. 6 to 10, a recess 22 having an L shape in plan view is formed outside the right corner of the rear end of the storage portion 5. The bottom portion of the recess 22 has a portion facing the rear side wall portion 5A of the storage portion 5 at a predetermined height (in the present embodiment, a height of about 3 mm to 5 mm) than the bottom portion of the corner of the recess 22. The spring receiving portion 29 of the right base member 24 that is formed so as to be higher and that constitutes the right link unit 9 is placed thereon.
Further, the engaging portion 32 of the right base member 24 is located in the vicinity of the rear side wall portion 5 </ b> A of the storage portion 5.

The main body case 2 includes a resin frame cover 2A and a bottom cover 2B made of metal such as stainless steel. A through-hole 51 that penetrates the frame cover 2A is formed in the right corner of the recess 22, and the flat plate portion 26 of the right base member 24 that constitutes the right link unit 9 has one end to which the link member 25 is attached. The other end side is inserted into the through hole 51 and is placed on the bottom surface of the recess 22. The other end side of the flat plate portion 26 is screwed to the bottom surface portion of the frame cover 2A by screws 23 and 23 from below.
Further, as shown in FIGS. 9 and 10, the rotation center of the link member 25 and the coil center axis of the right torsion coil spring 16A are located on the same vertical plane.

Here, as shown in FIGS. 3 and 9, the portion of the rear side wall portion 5 </ b> A of the storage portion 5 that faces the outer edge of each of the torsion coil springs 16 </ b> A, 16 </ b> B is near the bottom surface portion 5 </ b> C of the storage portion 5. Each notch groove 5B is formed by cutting out up to. Thereby, when each torsion coil spring 16A, 16B is pushed and bent by the case cover 4 as described later, it is possible to avoid interference between each torsion coil spring 16A, 16B and the rear side wall portion 5A.
Further, as shown in FIGS. 3, 6 and 10, a locking piece 15 of the case cover 4 is engaged near the rear end portion of the left side wall portion 5D of the storage portion 5 as will be described later. Convex part 5E is formed. Further, near the rear end portion of the right side wall portion 5F of the storage portion 5, a locking convex portion 5G to be engaged with the locking piece 12 of the case cover 4 is formed as will be described later.

Next, a schematic configuration of the case cover 4 will be described with reference to FIGS. 11 and 12.
As shown in FIGS. 11 and 12, the case cover 4 includes a resin surface member 55 having a predetermined thickness (in this embodiment, a thickness of about 1 mm), and an inner surface of the resin surface member 55. And a metal reinforcing plate 56 formed of stainless steel or the like having a predetermined thickness (in this embodiment, a thickness of about 1 mm) that is fixed by welding, adhesion or the like.
Further, the central portion of the rear end of the resin surface member 55 is cut into a rectangle in the inner direction, and a window member 57 made of a transparent resin is fixed by adhesion, double-sided adhesive tape, or the like. In addition, a group of horizontally elongated protrusions 58 and 58 are formed at both front corners of the surface portion of the resin surface member 55 so that the case cover 4 can be easily slid relative to the main body case 2. It is comprised so that a moving force can be given.

  Further, the metal reinforcing plate 56 is provided with a number of triangular holes to reduce the weight. Further, the portion of the metal reinforcing plate 56 facing the window member 57 is cut into a rectangular shape in the inner direction, and after fixing the metal reinforcing plate 56 to the inner side surface of the resin surface member 55, the window member 57 is fixed. It is configured to be possible.

  The reinforcing plate 56 has protrusions 59 at positions facing the claw portions 20A formed at both ends of the rear edge of the pressing plate 20. Each claw portion 20A of the pressing plate 20 is inserted into a locking hole formed by each projection 59 and the inner surface of the resin surface member 55. In addition, on both sides of the front end portion of the metal reinforcing plate 56, extending portions 60 that extend in a right-angled downward direction and further extend in a right-angled outward direction are formed. Each elongated hole 60 </ b> A is formed in the side surface portion of the extending portion 60 in the vertical direction. And each protrusion piece 20B extended in the outward direction from the right-and-left edge part of the pressing board 20 is inserted in each long hole 60A, and it can move to an up-down direction. Thereby, the pressing plate 20 is attached so as to be swingable in the vertical direction along the long holes 60 </ b> A around the claw portions 20 </ b> A in a state of being biased downward by the coil springs 19.

Further, on both sides of the rear end edge portion of the metal reinforcing plate 56, a predetermined length is provided in the lower direction, and is further extended perpendicularly from the lower end portion to the downstream side in the sheet conveying direction to form an L shape in side view. Each locking piece 12, 15 is provided. In addition, at the rear end corner of the metal reinforcing plate 56, each extending portion 61 is provided in a predetermined length downward in a downward direction so as to face each locking piece 12,15. Then, both end portions of the pair of locking shafts 62 are attached to the lower end portions of the locking pieces 12, 15 and the extending portions 61, and are arranged along the direction perpendicular to the sheet conveying direction. Has been. Each locking shaft 62 is provided at a position facing each link member 25 of each link unit 9, 10.
In addition, at the position facing the engaging portions 32 and 48 of the link units 9 and 10 on the rear end edge of the metal reinforcing plate 56, a predetermined length is provided in the downward direction, and further from the lower end. Locking pieces 13 and 14 are provided which extend perpendicularly to the downstream side in the sheet conveying direction and are formed in an L shape in side view.

Next, attachment of the case cover 4 to the main body case 2 will be described with reference to FIGS.
As shown in FIG. 13 and FIG. 14, first, each link member 25 of each link unit 9, 10 disposed at each corner of the rear end of the main body case 2 is provided with each corner provided at each corner of the rear end of the case cover 4. The locking shaft 62 is opposed from above. Then, the respective locking shafts 62 are pushed into the respective shaft insertion portions 38 while being brought into contact with the guide portions 39 of the respective link members 25. Thereby, since the link member 25 is a resin molded product such as polyacetal, each guide portion 39 is pushed outward by the locking shaft 62, and the locking shaft 62 passes through each shaft insertion portion 38 to each. It fits in the through hole 37. Since the diameter of each through-hole 37 is substantially the same as the diameter of each locking shaft 62, the case cover 4 can be rotated in the vertical direction about each locking shaft 62.

Further, as shown in FIGS. 14B and 15, the opening angle regulating portions of the base members 24 and 41 of the link units 9 and 10 are fitted by fitting the locking shafts 62 into the through holes 37. The other edge portions of the torsion coil springs 16A and 16B that are in contact with 30 and 46 are in contact with the reinforcing plate 56 of the case cover 4, and the case cover 4 is provided with each torsion coil spring around the locking shaft 62. The case cover 4 is rotated upward by 16A and 16B, and the rear lower end edge of the case cover 4 is pressed to the rear end of the frame cover 2A of the main body case 2 to be in a maximum open state.
On the other hand, as shown in FIG. 14 (B) → (A), the case cover 4 holds the main body case 2 in the maximum open state in which the rear lower edge is in contact with the rear surface portion of the main body case 2. By pulling the case cover 4 upward, the locking shafts 62 can be removed from the through holes 37 and the case cover 4 can be removed from the main body case 2.

Here, the opening angle of each torsion coil spring 16A, 16B will be described with reference to FIG.
Since the opening angles of the torsion coil springs 16A and 16B attached to the base members 24 and 41 are substantially the same, the right torsion coil spring 16A attached to the right base member 24 will be described.
As shown in FIG. 16A, the right side torsion coil spring 16A has a maximum opening angle θ1 when it is a single unit (in this embodiment, θ1 is about 120 degrees). As shown in FIG. 16B, when the right torsion coil spring 16 </ b> A is attached to the coil attachment portion 31 of the right base member 24, one end edge portion is brought into contact with the spring receiving portion 29. At the same time, the other end edge is in contact with the opening angle restricting portion 30 from the inside, and the right base member has an opening angle θ2 smaller than the maximum opening angle θ1 (in this embodiment, θ2 is about 80 degrees). 24.

  Further, as shown in FIG. 16C, when the locking shafts 62 of the case cover 4 are fitted into the through holes 37 of the link members 25 and attached to the main body case 2, the right torsion coil spring 16A The other edge portion that contacts the opening angle restricting portion 30 contacts the reinforcing plate 56 of the case cover 4. At this time, the rear end edge portion of the case cover 4 abuts on the rear end edge portion of the frame member 2 </ b> A of the main body case 2, and the rotation of the case cover 4 around the locking shaft 62 is restricted. For this reason, the other end edge portion of the right side torsion coil spring 16A is pressed inward, and the opening angle θ3 is smaller than the opening angle θ2 when attached to the right base member 24 (in this embodiment, θ3 is about 70 degrees)) and comes into contact with the reinforcing plate 56 of the case cover 4. Thereby, when the case cover 4 is opened, the case cover 4 is maintained in a maximum open state in which the rear lower end edge is in contact with the rear surface portion of the main body case 2.

Further, here, when the case cover 4 is in the maximum open state, the direction in which each torsion coil spring 16A, 16B acts on each locking shaft 62 of the case cover 4 is based on FIG. 16 (C) and FIG. explain.
In addition, since the direction of the force which each torsion coil spring 16A, 16B attached to each base member 24, 41 acts on each locking shaft 62 is substantially the same, the locking attached to the link member 25 of the right link unit 9 The shaft 62 will be described.

As shown in FIG. 16C, the other edge of the right torsion coil spring 16A has an opening angle θ3 smaller than 90 degrees when the case cover 4 is attached (in this embodiment, θ3 is about 70 degrees)) and comes into contact with the reinforcing plate 56 of the case cover 4.
For this reason, as shown in FIG. 17, the locking shaft 62 attached to each through hole 37 of the link member 25 has a predetermined angle θ3 (in this embodiment) in the rear direction from the vertical direction by the right side torsion coil spring 16A. , Θ3 is about 70 degrees.) A pressing force F acts in the inclined direction. Accordingly, the vertical upward force acting to remove the locking shaft 62 from each through-hole 37 is reduced, so that even if the pressing force F of the right side torsion coil spring 16A is increased, the locking shaft 62 is in the respective through-hole 37. I will not deviate from.

  When a large external force that further rotates the case cover 4 in the outward direction is applied with the case cover 4 opened, a large external force is applied to the locking shaft 62 in the same direction as the pressing force F. Since the vertical upward force acting to remove the locking shafts 62 from the respective through holes 37 is also increased, the locking shafts 62 are detached from the respective through holes 37, and the case cover 4 is not destroyed, and the case cover 4 is not broken. Come off.

Next, opening and closing of the case cover 4 will be described with reference to FIGS.
As shown in FIGS. 18 to 19, the case cover 4 is rotated about the locking shafts 62 toward the main body case 2 against the drag of the torsion coil springs 16 </ b> A and 16 </ b> B. Make contact. As a result, the lower end portion of the locking piece 13 extending downward from the inner surface of the reinforcing plate 56 of the case cover 4 faces the engaging portion 32 formed on the right base member 24 of the right link unit 9. To do.
Similarly, the lower end portion of the locking piece 14 extending from the inner surface of the reinforcing plate 56 of the case cover 4 faces the engaging portion 48 formed on the left base member 41 of the left link unit 10.

In addition, the arc-shaped end edge portion of the right torsion coil spring 16 </ b> A that contacts the reinforcing plate 56 of the case cover 4 is rotated in the front direction around the center axis of the coil inserted into the coil mounting portion 31 of the right base member 24. The cutout groove 5B is formed by being cut out in the rear side wall portion 5A of the storage portion 5, and is substantially parallel to the inner surface of the case cover 4.
Similarly, the arc-shaped end edge of the left torsion coil spring 16B that contacts the reinforcing plate 56 of the case cover 4 rotates in the forward direction around the center axis of the coil inserted in the coil mounting portion 47 of the left base member 41. It is moved to enter the notch groove 5B formed by being cut out in the rear side wall part 5A of the storage part 5, and is substantially parallel to the inner side surface of the case cover 4.
As shown in FIGS. 19C and 19D, each locking shaft 62 is located on the rear side of the coil central axis of each torsion coil spring 16A, 16B. The distance between the coil springs 16A and 16B and the position where the coil springs 16A and 16B contact the inner surface of the case cover 4 is increased, and a rotational moment is generated by the torsion coil springs 16A and 16B. growing.

Further, the lower end portion of the locking piece 12 extending downward from the right side of the rear end edge portion of the reinforcing plate 56 of the case cover 4 is formed near the rear end portion of the right side wall portion 5F of the storage portion 5. Opposite the joint convex portion 5G.
Similarly, the lower end of the locking piece 15 extending downward from the left side of the rear end edge of the reinforcing plate 56 of the case cover 4 is formed near the rear end of the left side wall 5D of the storage unit 5. It faces the engaging projection 5E.

Then, as shown in FIGS. 19 to 20, the case cover 4 is extended downward from the inner side surface of the reinforcing plate 56 of the case cover 4 by sliding the case cover 4 in the conveyance direction of the paper 7, that is, the front side direction. The lower end portion of the locking piece 13 is engaged with an engaging portion 32 formed on the right base member 24 of the right link unit 9.
Similarly, the lower end portion of the locking piece 14 extending downward from the inner surface of the reinforcing plate 56 of the case cover 4 is an engaging portion 48 formed on the left base member 41 of the left link unit 10. Is engaged.

Further, the arc-shaped end edge portion of the right side torsion coil spring 16 </ b> A slides on the reinforcing plate 56. Similarly, the arc-shaped end edge portion of the left torsion coil spring 16B slides on the reinforcing plate 56.
The lower end portion of the locking piece 12 extending downward from the right side of the rear end edge portion of the reinforcing plate 56 of the case cover 4 is formed near the rear end portion of the right side wall portion 5F of the storage portion 5. The link member 25 of the right link unit 9 is rotated about the shaft 36 in the front direction by engaging with the mating convex portion 5G and moving the locking shaft 62 in the front direction.

Similarly, the lower end of the locking piece 15 extending downward from the left side of the rear end edge of the reinforcing plate 56 of the case cover 4 is formed near the rear end of the left side wall 5D of the storage unit 5. The link member 25 of the left link unit 10 is rotated about the shaft 36 in the front direction by engaging with the engagement convex portion 5E and moving the locking shaft 62 in the front direction.
Therefore, by bringing the case cover 4 into contact with the main body case 2 and sliding it forward, the locking pieces 13 and 14 are engaged with the engaging portions 32 and 48 and the locking pieces 12 are engaged. , 15 are engaged with the engaging projections 5G, 5E, and the case cover 4 is in a fixed state.
As shown in FIGS. 20C and 20D, by sliding the case cover 4 in the front direction, each link member 25 is rotated in the front direction, and each locking shaft 62 is Since the torsion coil springs 16A and 16B are positioned in front of the coil central axis, the distance between each locking shaft 62 and the position where each torsion coil spring 16A and 16B contacts the inner surface of the case cover 4 is shortened. The rotational moment for rotating the case cover 4 by 16A and 16B outwardly about each locking shaft 62 is reduced.

On the other hand, as shown in FIGS. 20 to 19, by sliding the case cover 4 in the fixed state downstream in the sheet conveying direction, that is, in the rearward direction, the locking pieces 13 and 14 and the engaging portions 32 and 48 are respectively moved. Is released, and the engaging pieces 12, 15 and the engaging projections 5G, 5E are disengaged. Accordingly, as shown in FIGS. 19 to 18, the case cover 4 is fully opened by the torsion coil springs 16 </ b> A and 16 </ b> B, and the sheet 7 can be easily mounted in the storage portion 5.
Further, by sliding the case cover 4 in the rearward direction, each link member 25 is rotated in the rearward direction, so that each locking shaft 62 is behind the coil central axis of each torsion coil spring 16A, 16B. Will be located on the side. As a result, the distance between each locking shaft 62 and the position where each torsion coil spring 16A, 16B contacts the inner surface of the case cover 4 is increased, and the case cover 4 by each torsion coil spring 16A, 16B is attached to each locking shaft 62. The rotational moment that rotates outward in the center increases.

  Here, the sheet 7 functions as a recording medium. The case cover 4 functions as a lid member. Further, the right side torsion coil spring 16A and the left side torsion coil spring 16B constitute biasing means. Each locking piece 13, 14 functions as a first locking piece. Moreover, each latching piece 11 and 15 functions as a 2nd latching piece. Further, the right base member 24 and the left base member 41 function as a metal base member. In addition, each opening angle restricting portion 30, 46 functions as a rotation stop portion.

  Therefore, in the printing apparatus 1 according to the present embodiment, the case cover 4 has the locking shafts 62 provided at the corners on the rear end side of the metal reinforcing plate 56 fixed to the inner surface of the resin surface member 55. In order to be detachably attached to each through-hole 37 of the link member 25 through the shaft insertion portion 38 cut out at the upper end portion of each link member 25 disposed at both corners of the rear end of the body case 2, Even if the case cover 4 is enlarged by maintaining the thickness dimension of the printing apparatus 1 and increasing the size of the paper 7 (for example, changing from A7 size thermal paper to A6 size thermal paper) Since the rotation fulcrum portion is formed by the engagement between the locking shaft 62 and each link member 25, sufficient strength can be provided. In addition, each locking shaft 62 of the case cover 4 is detachably attached to each through hole 37 of each link member 25 of the main body case 2 via the shaft insertion portion 38, so that the case cover 4 can be rotated to a large extent. When power (external force) is applied, each locking shaft 62 is detached from each through-hole 37 of each link member 25, and it is possible to avoid the breakage of the rotation fulcrum portion of the case cover 4.

  Further, the case cover 4 rotated outward by the torsion coil springs 16A and 16B disposed adjacent to the link members 25 is resisted against the drag force of the torsion coil springs 16A and 16B around the locking shafts 62. Then, after rotating to the main body case 2 side and abutting on the main body case 2, the metal reinforcement fixed to the inner side of the case cover 4 by sliding the sheet 7 in the downstream direction in the transport direction, that is, in the front direction. The lower end portions of the locking pieces 13 and 14 provided at the rear edge portion of the plate 56 are disposed adjacent to the torsion coil springs 16A and 16B, and are forward of the rotation centers of the link members 25. The case cover 4 is brought into a fixed state by being engaged with the engaging portions 32 and 48 provided so as to be positioned at the positions. In addition, the engaging pieces 12 and 15 provided on both sides of the rear end of the metal reinforcing plate 56 fixed to the inside of the case cover 4 are respectively protruded from both side walls 5D and 5F of the storage unit 5. The case cover 4 is fixed by being engaged with the mating convex portions 5G and 5E.

Thereby, when the case cover 4 is closed, each link member 25, each locking shaft 62, each torsion coil spring 16A, 16B, each engaging portion 32, 48, and each locking piece 12-15 are external surfaces. Therefore, it is possible to ensure design freedom.
Further, by sliding the case cover 4 in the rearward direction, the case 7 can be opened and the paper 7 can be loaded. Therefore, the size of the paper 7 is increased (for example, from A7 size thermal paper to A6 size). Change to thermal paper.) Even if the case cover 4 is enlarged, the thickness of the printing apparatus 1 can be reduced.
Further, by sliding the case cover in the front direction, the locking pieces 12 and 15 provided on the inner side surface of the case cover 4 are engaged with the engaging protrusions 5G and 5E. It is possible to reliably prevent the lifting of both side surfaces.
Further, the case cover 4 can be opened by sliding the case cover 4 upstream in the transport direction of the paper 7, that is, the rear side, so that the paper 7 can be mounted. Even if it is provided on both sides of the rear end of the plate 56, the thickness of the printing apparatus 1 can be reduced.

Further, the locking pieces 13, 14 are formed on the metal reinforcing plate 56, the engaging portions 32, 48 are formed on the metal base members 24, 41, and the locking pieces 13, 14 are connected to each other. The case cover 4 is fixed by being engaged with the joint portions 32 and 48. Thus, even when the weight of the case cover 4 increases and the spring strength of the torsion coil springs 16A and 16B increases, the locking pieces 13 and 14 and the engaging portions 32 and 48 are Since it is made of metal, deformation of the main body case 2 and the case cover 4 can be reliably prevented.
Further, since the locking pieces 12 and 15 are formed on the metal reinforcing plate 56 fixed to the inner side surface of the resin surface member 55 of the case cover 4, press forming is performed simultaneously with the locking pieces 13 and 14. This makes it possible to reduce the number of parts.

The arcuate edge portions of the torsion coil springs 16A and 16B are attached in contact with the opening angle restricting portions 30 and 46 of the metal base members 24 and 41. It becomes possible to reliably prevent the deformation of the main body case 2 and the case cover 4 due to the reaction force of 16B. In addition, each torsion coil spring 16A, 16B is attached to each base member 24, 41 in a state in which the opening angle is restricted by abutting against each opening angle restricting portion 30, 46. When the shaft 62 is mounted in each through-hole 37 of each link member 25, the standby position of each torsion coil spring 16A, 16B can be regulated, and the case cover 4 can be attached and detached smoothly. It becomes.
When the case cover 4 is opened, the rear lower edge of the case cover 4 comes into contact with the rear surface portion of the main body case 2, and the torsion coil springs 16A and 16B It abuts against the inner surface of the case cover 4 at an opening angle θ3 smaller than the abutment state with respect to 30 and 46. Thus, when the case cover 4 is opened, the maximum open state in which the rear lower edge of the case cover 4 is in contact with the rear surface portion of the main body case 2 can be reliably maintained, and the paper 7 can be easily Can be attached to.

  Further, when the case cover 4 is slid in the front direction after coming into contact with the main body case 2, the link members 25 are rotated in the front direction, and the locking shafts 62 are connected to the torsion coil springs 16A and 16B. It is located on the front side in the conveyance direction of the paper 7 from the coil central axis. Further, when the case cover 4 is slid in the rearward direction from the fixed state, the link members 25 are rotated in the rearward direction, and the locking shafts 62 are coiled by the torsion coil springs 16A and 16B. Located behind the central axis.

  Thus, when the case cover 4 is closed and fixed, each locking shaft 62 is positioned in front of the coil center axis of each torsion coil spring 16A, 16B, so that each locking shaft 62 is each torsion coil spring. When the operating point of 16A and 16B is approached, the rotational moment acting on each locking shaft 62 of the case cover 4 is reduced, and the case cover 4 can be prevented from being lifted. Further, when the case cover 4 is slid in the rearward direction from the fixed state, the locking shafts 62 are positioned on the rear side of the coil central axes of the torsion coil springs 16A and 16B. 62 moves away from the point of action of each of the torsion coil springs 16A and 16B, and the rotational moment acting on each locking shaft 62 of the case cover 4 increases, so that the opening force of the case cover 4 can be increased.

  In addition, this invention is not limited to the said Example, Of course, various improvement and deformation | transformation are possible within the range which does not deviate from the summary of this invention.

1 is an external perspective view of a printing apparatus according to an embodiment. It is the figure which showed the opening / closing operation | movement of the case cover of a printing apparatus. It is a perspective view from the upper right side shown by opening the case cover of the printing apparatus. It is a disassembled perspective view explaining the structure of a left side link unit. It is a disassembled perspective view explaining the structure of a right side link unit. It is a partial top view which shows the left side link unit provided in the left side rear end corner part of the main body case. It is a partial front view which shows the left side link unit provided in the left side rear end corner part of the main body case. It is an AA arrow partial sectional view of FIG. It is a BB arrow partial sectional view of FIG. It is CC sectional view taken on the line in FIG. It is an outer side perspective view of a case cover. It is an inner side perspective view of a case cover. It is a perspective view which shows attachment to the main body case of a case cover. It is principal part sectional drawing of the rear end right corner | angular part which shows attachment to the main body case of a case cover. It is a principal part perspective view which shows the state which attached the case cover to the left side link unit and the right side link unit. It is a figure explaining the opening angle of a right side torsion coil spring, (A) is a state when fully open, (B) is a state when attached to a right base member, (C) is a figure which shows a state when a case cover is attached. It is a figure explaining the force direction which a torsion coil spring acts with respect to the locking shaft with which the link member was mounted | worn. It is a principal part enlarged view which shows the rear end right corner | angular part of a case cover in a fully open state, (A) is a side view, (B) is a sectional side view including the locking piece 13, (C) is the other side of a right side torsion coil spring The side sectional view including the end edge portion, (D) is a side sectional view including the locking piece 12. The main part case is in contact with the main body case, and is a main part enlarged view showing the rear end right corner of the slidable state, (A) is a side view, (B) is a side sectional view including the locking piece 13, (C ) Is a side sectional view including the other edge of the right torsion coil spring, and (D) is a side sectional view including the locking piece 12. It is a principal part enlarged view which shows the rear end right corner | angular part in the state where the case cover was closed, (A) is a side view, (B) is a sectional side view including the locking piece 13, and (C) is the other of the right side torsion coil spring. (D) is a side sectional view including the locking piece 12.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printing apparatus 2 Main body case 4 Case cover 5 Storage part 5E, 5G Engagement convex part 7 Paper 9 Left link unit 10 Right link unit 12, 13, 14, 15 Locking piece 16A, 16B Torsion coil spring 22 Recessed part 24 Left base member 25 Link member 30, 46 Opening angle restricting portion 31, 47 Coil mounting portion 32, 48 Engaging portion 36 Shaft 37 Through hole 38 Shaft insertion portion 41 Left base member 55 Surface member 56 Reinforcement plate 60, 61 Extension portion 61 Locking axis

Claims (5)

In a printing apparatus comprising: a storage unit that opens to one surface side of a main body case and stores recording media in a stacked state; and a lid member that is provided in the main body case so as to be openable and closable and covers the storage unit.
The body case is
The lower end of the main body case is disposed at both corners of the rear end so as to be pivotable in the recording medium conveyance direction, and a through hole is formed in the upper end side in a direction perpendicular to the rotation direction. A pair of link members in which the upper end portion of the through hole is cut out along the axial direction of the through hole and the shaft insertion portion is formed;
A pair of torsion coil springs arranged adjacent to each link member and biasing the lid member to rotate outwardly;
A pair of engaging portions disposed adjacent to each torsion coil spring and provided to be positioned downstream of the rotation center of each link member in the recording medium conveyance direction;
Have
The lid member is
A pair of locking shafts arranged along the direction perpendicular to the recording medium conveyance direction at positions facing the respective link members at both corners on the rear end side of the inner surface;
A predetermined length is vertically suspended from the rear edge of the inner surface so as to face each of the engaging portions, and is further extended at a right angle from the lower end to the downstream side in the recording medium conveyance direction. A pair of first locking pieces formed in an L-shape;
Have
The lid member is removably attached to the through hole of the link member via the shaft insertion portion of the link member, and the lid member is rotated outward by the pair of torsion coil springs . ,
By rotating to the main body case side against the drag force of the pair of torsion coil springs around the locking shaft and contacting the main body case, the slide shafts are slid to the downstream side in the recording medium conveying direction. Rutotomoni is engaged with the cover member lower portion of the first engaging piece to the respective engaging portions are in a fixed state, wherein each link member is rotated to the recording medium conveyance direction downstream side, each engagement The stop shaft is located downstream of the coil central axis of the torsion coil spring in the recording medium conveyance direction ,
When the lid member is slid from the fixed state to the upstream side in the recording medium conveyance direction, the lid member can be opened, the recording medium can be mounted , and each link member is rotated upstream in the recording medium conveyance direction. Then, each of the locking shafts is located upstream of the coil central axis of the torsion coil spring in the recording medium conveyance direction . The main body case has a pair of engaging protrusions projecting inward from both inner side wall portions on the downstream side in the recording medium conveyance direction of the link members,
The lid member is suspended from the inner surface by a predetermined length in the downward direction so as to face the engaging projections, and is further extended at a right angle from the lower end to the downstream side in the recording medium conveyance direction. Having a pair of second locking pieces formed in an L-shape,
Each of the second locking pieces rotates toward the main body case against the drag force of the pair of torsion coil springs about the locking shaft, and contacts the main body case. By sliding to the downstream side in the medium conveying direction, the lower end portion of each second locking piece is engaged with each engaging convex portion,
2. The printing apparatus according to claim 1, wherein the cover member is opened by sliding the cover member upstream in the recording medium conveyance direction, and the recording medium can be mounted. The main body case has a metal base member to which each torsion coil spring is attached,
The lid member is a resin surface member;
A metal reinforcing plate fixed to the inner surface of the resin surface member,
Each engaging portion is formed on the metal base member,
The printing apparatus according to claim 1, wherein each first locking piece is formed on the metal reinforcing plate.   The printing apparatus according to claim 3, wherein each of the second locking pieces is formed on the metal reinforcing plate. Before SL each torsion coil spring is mounted in contact with the rotation stopper portion for regulating the opening angle of the torsion coil spring of the metallic base member,
When the lid member is opened, the rear lower edge of the lid member abuts on the rear surface portion of the main body case, and the torsion coil springs are smaller than those in contact with the rotation stop portion. The printing apparatus according to claim 3, wherein the printing apparatus abuts on an inner surface of the lid member at an opening angle.

Images