JP2007044940A - Printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose a printer with a lock mechanism for surely locking an opening/closing lid without looseness. <P>SOLUTION: The printer 1 is composed so that an opening/closing lid unit 3 is mounted to the front of a body unit 2 so as to be forwardly openable and closable, and a roll paper storage part 9 in a printer body is in an opening state when the opening/closing lid unit 3 is opened. The lock mechanism 80 for locking the opening/closing lid unit 3 in the closing position is provided with a pair of right and left lock shafts 83, 84 mounted to the opening/closing lid unit 3, a pair of right and left lock levers 81, 82 mounted to the printer body 2, and tension coil springs 85, 86 pulling the lock levers 81, 82 toward locking positions L. The right and left lock levers 81, 82 are independently rotatable in their locking positions and locking release positions. Therefore, it is possible to prevent the formation of a locked state that only one lock lever is engaged with the lock shaft and the other lock lever is left as it is while floating from the lock shaft. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement in a lock mechanism for locking an open / close lid in a closed position in a printer having an open / close lid attached to a printer body.

  In a POS system or the like, a thermal printer that performs printing on roll paper is widely used. As this type of printer, there is known a printer having a structure in which the roll paper storage unit is fully opened when the opening / closing lid attached to the printer body is opened, and the roll paper can be easily replaced. Also known is a platen roller attached to the front end of the opening / closing lid, and when the opening / closing lid is opened, the platen roller is separated from the thermal head, and the operation of setting the roll paper between them can be easily performed. . Furthermore, in a printer in which a scissors-type cutter is arranged near the recording paper discharge port, one of the fixed blade and movable blade of the cutter is mounted on the opening / closing lid side together with the platen roller, and the work of setting the roll paper is simplified. A structure that can be made is also known.

  A printer provided with such an opening / closing lid is provided with a lock mechanism for locking the opening / closing lid to the printer body so that the opening / closing lid does not open carelessly. In particular, in a printer that can reversely feed recording paper such as roll paper, a force in the direction of opening the opening / closing lid acts on the platen roller from the side of the drive gear for rotational force transmission on the printer body side during reverse feeding. The open / close lid is easy to open. Further, even when the recording paper is cut by the scissors cutter, the reaction force in the direction of opening the opening / closing lid from the fixed blade or the movable blade acts on the opening / closing lid, so that the opening / closing lid is easily opened. Therefore, a lock mechanism for the opening / closing lid is indispensable.

The opening / closing lid locking mechanism generally has a structure in which a pair of left and right locking levers are attached to the opening / closing lid so as to be rotatable, and a lock lever latching portion is formed at a corresponding portion on the printer body side. ing. Further, the left and right lock levers rotate integrally, and are biased toward the lock lever latching portion by a spring force. When the open / close lid is closed, the left and right lock levers come into contact with the front ends of the corresponding lock lever latching portions, and over the front ends, a locked state with the latching portions is formed. Such a locking mechanism is disclosed in Patent Document 1.
Japanese Patent Laid-Open No. 9-240083, FIGS. 6 and 7

  However, the relative positional relationship between the left and right lock levers when the open / close lid is closed and the left and right lock lever hooks on the printer main body side may not be the same due to manufacturing errors, assembly errors, and the like. For example, in the locked state, one lock lever is securely hooked to the lock lever hooking portion, whereas a gap may be formed between the other lock lever and the lock lever hooking portion.

  When such a locked state is formed, when a force is applied to the opening / closing lid in a direction in which the opening / closing lid is opened, the gap portion of the opening / closing lid is lifted, and the pressing force of the platen roller against the thermal head is increased. It becomes non-uniform in the axial direction. When the recording paper is conveyed in this state, skew (skewing and meandering) occurs in the recording paper, and there is a risk that problems such as paper jams may occur. In a thermal printer, a recording sheet is sandwiched between a thermal head and a platen roller, and printing is performed while applying a predetermined pressing force. During printing, if the pressing force between them is not uniform, the printing density tends to be high at the part where the pressing force is high, and the printing density tends to be low at the part where the pressing force is low, which may cause deterioration of the printing quality. is there.

  Furthermore, when one of the blades of a saddle type cutter is mounted on the opening / closing lid, if a force in the direction of pushing the opening / closing lid acts on the opening / closing lid when cutting the recording paper, There is also a risk that a rattling will occur, causing problems such as disruption of the cutting line.

  In view of the above, an object of the present invention is to propose a printer including a lock mechanism that can securely lock an opening / closing lid without rattling.

  In order to solve the above problems, a printer of the present invention includes: a printer main body, an open / close lid attached to the printer main body so as to be openable / closable, a lock mechanism for locking the open / close lid in a closed state, and the lock A manual operation lever operated to release the lock by the mechanism; the lock mechanism includes a fixed-side engagement member, a lock position latched on the fixed-side engagement member, and the fixed-side engagement And at least a pair of rotation-side engagement members capable of rotating between unlocking positions released from the combined members, and an urging member that urges the rotation-side engagement members toward the lock position. The fixed-side engagement member is attached to one of the printer main body and the opening / closing lid, and the rotation-side engagement member is attached to the other in a state where it can be individually rotated. As a feature .

  The pair of rotation-side engaging members of the lock mechanism are attached to the printer main body or the opening / closing lid in such a state that they can be individually rotated. Therefore, unlike the case where these rotate together, a state is formed in which both of the rotating side engaging members are securely engaged with the fixed side engaging members. As a result, a state in which the opening / closing lid is locked with a gap between one of the rotating side engaging members and the fixed side engaging member does not occur.

  Further, the printer of the present invention is configured such that the pair of rotations interlocked with the operation of the manual operation levers in order to simultaneously rotate the individually rotatable lock levers to the unlock position by the operation of the manual operation levers. It has a lock release mechanism that simultaneously rotates the side engagement member from the lock position to the lock release position.

  Here, in the present invention, the fixed-side engagement member can be disposed on the opening / closing lid, and the rotation-side engagement member can be disposed on the printer body.

  Further, the fixed engagement member is a pair of shaft members, and the rotation engagement member is supported in a state in which the rotation engagement member can be rotated in the vertical direction of the printer at a portion corresponding to each shaft member. The front end portion of each lock lever is a hook portion provided with a hooking end surface that can be hooked on each shaft member from above or below, and a guide end surface that guides the shaft member to the hooking end surface. The urging member may be a pair of tension coil springs that are stretched between a portion of the lock lever that is on the rear side of the center of rotation of the lock lever and the printer main body.

  Furthermore, the unlocking mechanism according to the present invention includes a rotating shaft that is rotatably attached to the opening / closing lid unit, and a pair of releasing members that are attached to both ends of the rotating shaft so as to rotate integrally with the rotating shaft. And the release levers are respectively engaged with the front end portions of the corresponding lock levers, and one of the release levers is engaged with the manual operation lever, and the release lever and the lock The engagement state of the lever and the engagement state of the release lever and the manual operation lever are maintained by the spring force of the tension coil spring, and when the manual operation lever is operated, the release lever rotates simultaneously. Accordingly, the corresponding lock lever is rotated from the lock position to the lock release position, and the operation force applied to the manual operation lever is released. If that, by the spring force of the tension coil spring, the manual operation lever, the release lever and the manual operation lever is characterized in that return to the original position.

  In the printer of the present invention, as a lock mechanism for locking the opening / closing lid to the printer body, a pair of rotation-side engagement members for engaging with the fixed-side engagement member to form a locked state are individually rotated. It is attached to the open / close lid or the printer body in a possible state. Therefore, a state is formed in which the pair of rotating side engaging members urged to the lock position by the urging members are securely engaged with the fixed side engaging members. Therefore, it is possible to reliably prevent the adverse effect that the open / close lid is lifted and the recording paper is skewed, the adverse effect that the cutting line of the recording paper is disturbed, the adverse effect of the deterioration of the print quality, and the like.

  Embodiments of a roll paper printer to which the present invention is applied will be described below with reference to the drawings.

(overall structure)
FIG. 1 is an external perspective view of a roll paper printer to which the present invention is applied, and FIG. 2 is an external perspective view showing a state in which the opening / closing lid unit is opened.

  A roll paper printer 1 according to the present embodiment has a printer main body 2 and an opening / closing lid unit 3 (opening / closing lid) attached to the front surface of the printer main body 2. An operation panel unit 4 is provided at the front end of the printer main body 2. It is attached. A recording paper discharge port 5 extending in the printer width direction is formed at the upper end portion of the opening / closing lid unit 3 on the front surface of the printer.

  The printer main body 2 is covered with a box-shaped main body case 6 which is long before and after the front and bottom surfaces are opened. On the front surface of the open / close lid unit 3, an open / close lid case 7 that defines the front surface of the printer is attached. When the manual operation lever 8 disposed on the operation panel unit 4 is operated, the opening / closing lid unit 3 is released from a lock mechanism described later and opens forward with the lower end as a center. When the opening / closing lid unit 3 is opened, the front side of the roll paper storage unit 9 formed inside is opened, and the roll paper 10 can be replaced. On the front surface of the operation panel unit 4, a status display lamp group 4a made of LEDs and the like, a feed button 4b, and a power switch 4c are arranged.

  FIG. 3 is a schematic configuration diagram showing the inside of the roll paper printer 1. A roll paper storage unit 9 formed inside the roll paper printer 1 has an arc-shaped bottom plate 12 extending in the printer width direction, an arc-shaped top plate 13 extending in the printer width direction, and also extending in the printer width direction. Surrounded by the front plate 14. The roll paper storage unit 9 stores roll paper 10 in a rollable state. The tape-like recording paper 10a fed out from here passes through the printing position between the platen roller 15 and the thermal head 16 and is drawn forward, and forward from the recording paper discharge port 5 located in front of it. Discharged. A scissors-type recording paper cutting device 20 is disposed in front of the recording paper discharge port 5.

  The recording paper cutting device 20 includes a fixed blade 21 mounted on the printer body 2 side, a movable blade 22 and a movable blade drive mechanism 23 mounted on the opening / closing lid unit 3 side. The fixed blades 21 are arranged in the printer width direction in a substantially horizontal posture with the blade edge 21a facing forward. The movable blades 22 are arranged in the printer width direction at a position almost directly below the blade edge 21a of the fixed blade 21 with the blade edge 22a facing upward. In a state where the recording paper 10a is discharged between the cutting edges 21a and 22a (recording paper cutting position), the lower movable blade 22 is swung upward to be sandwiched between the two cutting edges 21a and 22a. A portion of the recording paper 10a is cut in the printer width direction.

  FIG. 4 is a side view showing the mechanism (the printer body 2 and the opening / closing lid unit 3) of the roll paper printer with the main body case 6 and the opening / closing lid case 7 removed. FIGS. 5A and 5B are a perspective view and a side view in a state where one side plate is omitted as shown by an imaginary line in order to show the internal structure. 6A and 6B are a perspective view and a side view showing a case where the opening / closing lid unit is opened in the same state as in FIG.

  Referring to these drawings, the printer main body 2 includes a base plate 31, left and right side plates 32 and 33 standing upright from the base plate 30, and rear sides of the left and right side plates 32 and 33. A back plate 30 is provided between the parts in the printer width direction. Between the upper ends of the side plates 32, 33, a head mounting plate 34 is stretched horizontally in the printer width direction. On the lower surface of the head mounting plate 34, the thermal head 16 has a substantially horizontal posture with the head surface 16 a facing downward. Is attached (see FIG. 3). The top plate 13 of the roll paper storage unit 9 is disposed below the rear portion of the head mounting plate 34. The bottom plate 12 of the roll paper storage unit 9 is disposed on the upper surface of the base plate 31.

  A fixed blade mounting plate 35 is disposed horizontally in the printer width direction above the head mounting plate 34, and the fixed blade 21 of the recording paper cutting device 20 faces forward and substantially horizontal below the front end of the fixed blade mounting plate 35. Is attached. The fixed blade mounting plate 35 is bridged between the upper ends of left and right swivel plates 36 and 37 (only the swivel plate 37 is shown in the figure) arranged outside the side plates 32 and 33. The swivel plates 36 and 37 can be slightly swiveled in the front-rear direction of the printer around their lower end portions 36a and 37a (only the lower end portion 37a is shown in the figure).

  When the recording paper 10a is cut by the recording paper cutting device 20, both the blade edges 21a and 22a intersect in a point contact state while the movable blade 22 pivots upward from the lower side and pushes the fixed blade 21 rearward. 10a is cut. In order to slightly retract the fixed blade 21 during cutting, the fixed blade 21 is supported by the swivel plates 36 and 37.

  A roll paper detection mechanism 50 for detecting that the remaining amount of the roll paper 10 stored in the roll paper storage unit 9 has become a predetermined amount or less is assembled to the lower end portion of the outer surface of the side plate 32. .

  On the other hand, the open / close lid unit 3 is configured to open by a predetermined angle forward of the printer around the support shafts 41 and 42 attached to the lower ends of the side plates 32 and 33 of the printer body 2. The opening / closing lid unit 3 includes a front plate portion 43 and narrow side plate portions 44 and 45 bent at right angles from both sides to the rear. A movable blade 22 and a movable blade drive mechanism 23 of the recording paper cutting device 20 are attached to the front surface of the front plate portion 43, and these portions are covered with a protective plate 24. The front side of the protection plate 24 is covered with an open / close lid case 7 (see FIG. 3). Further, the platen roller 15 is spanned between the side plate portions 44 and 45 in a rotatable state. Under the platen roller 15, the front plate 14 of the roll paper storage unit 9 attached to the back surface of the front plate portion 43 is disposed.

  As described above, the opening / closing lid unit 3 is mounted with the front plate 14 of the roll paper storage unit 9, the platen roller 15, and the movable blade 22 of the recording paper cutting device 20. When the opening / closing lid unit 3 is opened, as shown in FIGS. 2 and 5, the roll paper storage unit 9 is opened, and the recording paper discharge port 5 passes from the roll paper storage unit 9 via the printing position and the cutting position. The recording paper transport path leading to is opened. Therefore, when the open / close lid unit 3 is closed in a state where the recording paper 10a is pulled out from the roll paper 10 stored in the roll paper storage unit 9, the state in which the recording paper 10a is set along the recording paper conveyance path is automatically set. Can be formed. When the open / close lid unit 3 is closed, the recording paper 10a is sandwiched between the thermal head 16 and the platen roller 15 and is pressurized with a predetermined pressing force. The recording paper 10 a is conveyed while being in contact with the thermal head 16 by the rotation of the platen roller 15. At this time, the recording paper 10 a is colored and printed by the heat generated by the heating element of the thermal head 16. Since the heat of the heating element is conducted to the recording paper 10a, the pressing force between the thermal head 16 and the platen roller 15 greatly affects the print quality.

(Opening / closing lid locking / unlocking mechanism)
7 and 8 are side views showing the lock mechanism / unlock mechanism of the open / close lid unit 3, FIG. 7 shows a locked state in which the open / close lid unit 3 is closed, and FIG. 8 shows a unlocked state. The locking mechanism of this example will be described with reference to FIGS.

  The lock mechanism 80 includes a pair of left and right lock levers 81 and 82 (rotating side engaging members) attached to the printer body 2 side, and a pair of left and right lock shafts 83 and 84 (fixed) attached to the opening / closing lid unit 3 side. Side engaging member) and a pair of left and right tension coil springs 85 and 86 (urging members) for urging each of the lock levers 81 and 82 (in FIG. 5 (b), The position of the lock lever 82 before the tension coil spring 86 is hooked on the lock lever 82, and the positions of the release lever 93 and the manual operation lever 8 which will be described later linked to this are shown.

  The lock levers 81 and 82 are arranged in the front-rear direction of the printer along the inner side surfaces of the left and right side plates 32, 33 of the printer main body 2, and are fixed to the side plates 32, 33 in the middle of the front-rear direction. The support shafts 87 and 88 (only the support shaft 88 is shown in the figure) are supported in a vertically rotatable state. In this example, the lock levers 81 and 82 are included in a range including a range from the lock position L shown in FIG. 7 to the lock release position U shown in FIG. 8 by a not-illustrated restricting portion formed on the side plates 32 and 33. It can be rotated freely.

  Hook portions 81a and 82a are formed at the front end portions of the lock levers 81 and 82, and the hook portions 81a and 82a are for latching that can be latched on the front side of the corresponding lock shafts 83 and 84 from below. An upper chevron portion is provided with end surfaces 81b and 82b and lock shaft guide end surfaces 81c and 82c inclined forward and downward from the upper ends of the latching end surfaces 81a and 82a. The tension coil springs 85 and 86 are stretched between the rear ends 81d and 82d of the lock levers 81 and 82 and the portions on both sides of the upper end of the back plate 30 positioned below them.

  On the other hand, the pair of lock shafts 83, 84 protrude horizontally inward from the left and right side plate portions 44, 45 in the lower part of the platen roller 15 in the opening / closing lid unit 3.

  Next, the lock release mechanism 90 for releasing the lock of the open / close lid unit 3 by the lock mechanism 80 will be described. At a position on the front side of the lock shafts 83 and 84, a rotation shaft 91 supported by the side plate portions 44 and 45 in a state where both ends are rotatable is disposed. The rotary shaft 91 is stretched horizontally in the printer width direction. Both end portions of the rotary shaft 91 protrude outward from the side plate portions 44 and 45, and release levers 92 and 93 (only the release lever 93 is shown in the figure) extending in the longitudinal direction of the printer at the protruding shaft end portions. .) The rear end is fixed. In addition, a manual operation lever 8 is attached to a shaft end portion of the rotating shaft 91 on the side of one release lever 93 so as to be rotatable in the vertical direction. Further, an engagement pin 94 protruding to the manual operation lever 8 side is attached to the front end portion of the release lever 93 on the manual operation lever 8 side, and the manual operation lever 8 is mounted on the engagement pin 94. Is in a state of riding.

  Engagement protrusions 92 a and 93 a are formed at the rear ends of the pair of release levers 92 and 93, which protrude rearward below the portion fixed to the rotation shaft 91. These engagement protrusions 92a and 93a are formed in front of the front surface of engagement plate portions 81e and 82e that are bent at right angles to the outside and formed below the front hook portions 81a and 82a of the left and right lock levers 81 and 82, respectively. Abut. The contact points between the engagement protrusions 92a and 93a and the engagement plate portions 81e and 82e are set to be positioned below the support shafts 87 and 88 of the lock levers 81 and 82.

  As shown in FIG. 7, the lock mechanism 80 of the present example configured as described above is held in a locked state when the opening / closing lid unit 3 is closed. In the locked state, the hook portions of the left and right lock levers 81 and 82 on the printer main body 2 side are applied to the both end portions of the lock shafts 83 and 84 on the open / close lid unit 3 side by the tension coil springs 85 and 86 from below. 81a and 82a are pressed.

  As a result, the locking shafts 83 and 84 are pressed from the front by the hooking end surfaces 81b and 82b of the hook portions 81a and 82a, so that the lock lid unit 3 cannot be opened forward. Yes. Further, since the lock levers 81 and 82 can independently rotate about the support shafts 87 and 88, the lock levers 81 and 82 are securely held at the lock positions L latched on the lock shafts 83 and 84, respectively.

  Further, the left and right release levers 92 and 93 are supported by the engagement plate portions 81e and 82e at the front ends of the lock levers 81 and 82 that are urged upward about the support shafts 87 and 88 by the tension coil springs 85 and 86, respectively. Has been. Therefore, the manual operation lever 8 riding on the engagement pin of the release lever 93 is also held at its initial position.

  In this locked state, when the manual operation lever 8 is pulled downward, the lock release mechanism 90 releases the locked state. That is, the release lever 93 engaged with the manual operation lever 8 rotates downward, and the rotary shaft 91 to which the release lever 93 is fixed rotates together. Therefore, the release lever 92 fixed to the other end of the rotating shaft 91 is also integrally rotated downward. The engagement protrusions 92a and 93a at the rear ends of the left and right release levers 92 and 93 are lower than the rotation centers of the engagement plate portions 81e and 82e at the front ends of the left and right lock levers 81 and 82, respectively. It touches at a point. Therefore, when the release levers 92 and 93 are rotated downward, the lock levers 81 and 82 are forcibly rotated about the support shafts 87 and 88 by these.

  As a result, as shown in FIG. 8, the left and right lock levers 81, 82 rotate to the unlocking position U, and the hook portions 81 a, 82 a at their front ends are lowered below the lock shafts 83, 84. As a result, the unlocked state in which the engagement of the left and right lock levers 81 and 82 with respect to the lock shafts 83 and 84 is released. After this, the opening / closing lid unit 3 can be opened to the open position 3B by pulling the opening / closing lid unit 3 forward. FIG. 6 shows this fully open state. In this state, the left and right lock levers 81 and 82 are pulled by the tension coil springs 85 and 86 and are rotated to a position beyond their lock position L.

  Next, when the opening / closing lid unit 3 is closed from the fully opened state shown in FIG. 6, the locked state by the lock mechanism 80 is automatically formed again. When the opening / closing lid unit 3 reaches the vicinity of the closed position 3A, the lock shafts 83, 84 of the opening / closing lid unit 3 are in the hook portions 81a, 82a at the front end portions of the left and right lock levers 81, 82 on the printer main body 2 side. It hits the guide end faces 81c and 82c. Thereafter, in conjunction with the pushing operation of the opening / closing lid unit 3, the lock shafts 83, 84 slide on the guide end faces 81c, 82c while pushing the left and right lock levers 81, 82 downward. When the lock shafts 83 and 84 get over these lock guide end faces 81c and 82c, the lock levers 81 and 82 are rotated upward by the spring force, and the end faces for latching from the front side of the lock shafts 83 and 84. A locked state in which 81b and 82b are hooked is formed.

  In the lock mechanism 80 of this example configured as described above, the left and right lock levers 81 and 82 are independently rotated and locked with respect to the lock shafts 83 and 84 to form a lock state. Therefore, like a mechanism in which the left and right lock levers 81 and 82 are fixed to each other, a lock state is formed in which the lock lever hits the lock shaft only on one side and the lock lever is lifted from the lock shaft on the other side. Therefore, both lock levers are held in a state where they are in contact with the lock shaft, and a lock state without rattling is reliably formed. Therefore, even when a force is applied in the direction to open the opening / closing lid unit 3 as in the case of feeding the recording paper 10a backward, driving the recording paper cutting device 20 to cut the recording paper 10a, the opening / closing lid unit 3 does not rattle. For this reason, it is possible to prevent problems such as recording paper skew and recording paper cutting line disturbance. The pressing force between the thermal head 16 and the platen roller 15 is also uniform, and good print quality can be obtained.

  In this example, although a pair of lock levers 81 and 82 is provided, a configuration including three or more lock levers may be employed. Alternatively, the manual operation lever 8 can be provided on the left and right sides so that the opening / closing lid unit 3 can be opened with a smaller force.

1 is an external perspective view of a roll paper printer to which the present invention is applied. FIG. 3 is an external perspective view of the roll paper printer with an opening / closing lid opened. It is a schematic block diagram which shows the internal structure of a roll paper printer. FIG. 3 is a side view of the roll paper printer with a main body case and an open / close lid of the roll paper printer removed. FIG. 5 is a perspective view and a side view of the roll paper printer in a state where one side plate in FIG. 4 is omitted to show the internal structure. It is the perspective view and side view of the state which opened the opening-and-closing lid unit. It is a side view which shows the lock mechanism in a locked state. It is a side view which shows the lock mechanism of a lock release state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roll paper printer, 2 Printer main body, 3 Opening / closing lid unit, 3A Closed position, 3B open position, 5 Recording paper discharge port, 6 Main body case, 7 Opening / closing lid case, 9 Roll paper storage part 10, 15 Platen roller, 16 Thermal head, 80 Lock mechanism, 81, 82 Lock lever, 81a, 82a Hook, 81b, 82b Lock shaft latching end surface, 81c, 82c Lock shaft guide end surface, 81e, 82e Engaging plate portion, 83, 84 Lock shaft , 85, 86 Tension coil spring, 87, 88 Support shaft, 90 Lock release mechanism, 91 Rotating shaft, 92, 93 Release lever, 92a, 93a Engagement protrusion, 94 Engagement pin

Claims (5)

The printer itself,
An open / close lid attached to the printer body so as to be openable and closable;
A locking mechanism for locking the open / close lid in a closed state;
A manual operation lever that is operated to release the lock by the lock mechanism;
The locking mechanism is
A fixed engagement member;
At least a pair of rotating side engaging members capable of rotating between a locked position hooked on the fixed side engaging member and an unlocked position released from the fixed side engaging member;
An urging member that urges these rotating side engaging members toward the lock position;
The fixed-side engagement member is attached to one of the printer main body and the opening / closing lid, and the rotation-side engagement member is attached to the other in a state where it can be individually rotated. . In claim 1,
A printer having a lock release mechanism for simultaneously rotating at least a pair of the rotation side engaging members from the lock position to the lock release position in conjunction with an operation of the manual operation lever. In claim 2,
The fixed engagement member is disposed on the opening / closing lid,
The printer according to claim 1, wherein the rotating side engaging member is disposed in the printer main body. In claim 3,
The fixed-side engagement member is a pair of shaft members extending in the printer width direction,
The rotating side engaging member is a pair of lock levers supported in a state in which the rotating side engaging member can rotate in the vertical direction of the printer at a portion corresponding to each shaft member,
The front end portion of each lock lever is a hook portion having a latching end surface that can be latched on each shaft member from above or below, and a guide end surface that guides the shaft member to the latching end surface. And
The printer according to claim 1, wherein the urging member is a pair of tension coil springs spanned between a portion of the lock lever on the rear side from the center of rotation and the printer body. In claim 4,
The unlocking mechanism includes a rotation shaft attached to the opening / closing lid unit in a rotatable state, and a pair of release levers attached to both ends of the rotation shaft so as to rotate integrally with the rotation shaft, These release levers are respectively engaged with the front end portions of the corresponding lock levers, and one of the release levers is engaged with the manual operation lever,
The engagement state of the release lever and the lock lever, and the engagement state of the release lever and the manual operation lever are maintained by the spring force of the tension coil spring,
When the manual operation lever is operated, the release lever is rotated, and the corresponding lock lever is rotated from the lock position to the lock release position, and the operation force applied to the manual operation lever is released. And the manual operation lever, the release lever, and the manual operation lever are returned to their original positions by the spring force of the tension coil spring.

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