CN1519128A - Printers with a Cover Lock Mechanism - Google Patents

Abstract

The utility model relates to a printer with a cover locking mechanism. The cover frame is mounted on the body frame in an openable and closable manner. The lid locking mechanism locks the lid frame in a closed state on the body frame, and has a lock bar and a hook capable of locking the lock bar. The lock lever and the hook are relatively slidable in a direction substantially parallel to the opening and closing center axis of the lid frame. The above-mentioned lock bar slides in a first direction relative to the above-mentioned hook to form a locked state between the above-mentioned lock bar and the above-mentioned hook; The locked state of the hook above.

Description

Printers with a Cover Lock Mechanism

technical field

The present invention relates to a printer for POS systems, cash registers and the like. More specifically, the present invention relates to a cover lock mechanism for locking the cover frame to the body frame of a printer in which a cover frame is openably and closably attached to the body frame of the printer.

Background technique

Thermal printers that print on roll paper are widely used in POS systems and the like. In this type of printer, a cover frame is openably and closably attached to the main body frame of the printer. When the cover frame is opened, the roll paper loading part is fully opened, and printers with a structure that can easily perform roll paper replacement operations are widely known. . In addition, a platen roller is attached to the front end of the cover frame, and when the cover frame is opened, the platen roller can be separated from the thermal head, and the structure that can easily perform the operation of setting the roll paper through it is also widely known.

A printer having such a cover frame is generally provided with a cover locking mechanism for locking the cover frame on the body frame so that the cover frame cannot be accidentally opened. Especially in printers that can feed recording paper such as roll paper in the reverse direction, since the cover frame is easy to open when the paper is fed in the reverse direction, the cover lock mechanism is indispensable.

The conventional lid lock mechanism generally has a lock lever 102 attached to the lid frame 101 side and a hook 104 attached to the body frame 103 side as shown in FIG. 10A . The lock lever 102 is attached to the cover frame 101 with its upper end freely rotatable about a rotation center axis 102a parallel to the rotation center line 101a of the cover frame 101, and is rotatable in the front-rear direction. A hook 104 formed on one side of the main body frame 103 is provided on the movement track of the front end of the lock lever 102 based on the opening and closing of the cover frame 101, and the lock lever 102 is always directed to the side locked on the hook 104 by using a torsion spring or the like. Apply spring force.

When the cover frame 101 is closed, the front end portion of the lock lever 102 comes into contact with the hook 104 , and then the lock lever 102 rotates counterclockwise and passes over the hook 104 . As shown in FIG. 10B , in a state where the cover frame 101 is fully closed, a locking surface 102 b formed at the front end of the locking lever 102 is locked to the lower surface 104 a of the hook 104 from the lower side.

In addition, a platen roller 105 is attached to the front end of the cover frame 101, and when the cover frame 101 is closed, the platen roller 105 is in contact with the surface of the thermal head 106 provided on the body frame 103 side.

A printer having such a structured cover lock mechanism is disclosed in, for example, Japanese Unexamined Patent Publication No. 9-240083 (see FIGS. 6 and 7 ).

However, the lid lock mechanism constructed as described above has the following problems. The closed position of the cover frame 101 is determined, for example, by a bearing portion 107 supporting a rotating shaft 105a of a platen roller 105 formed on one side of the cover frame 101 as shown in the figure. If there is a manufacturing error of the cover frame 101 or a position error of the bearing portion 107, the closed position of the cover frame 101 will fluctuate. In particular, the closed position of the cover frame 101 tends to fluctuate up and down.

If the closed position of the cover frame 101 moves up and down, the relative position of the lock lever 102 mounted on the cover frame 101 and the hook 104 on the side of the body frame 103 will change. Especially in the case where the closed position of the cover frame 101 is biased upward, as shown in FIG. 10C , the locking surface 102b of the locking lever 102 cannot sufficiently enter the lower side of the hook 104 . As a result, the lock bar 102 is tilted backward, and the angle (lock angle θ) of the locking surface 102b relative to the lower surface 104a of the hook 104 is larger than that in the proper locked state (FIG. 10B). Therefore, the locking force of the lock lever 102 and the hook 104 is weakened, and the lock is easily disengaged.

Contents of the invention

An object of the present invention is to provide a printer having a cover lock mechanism capable of reliably locking the cover frame on the body frame side even if the closed position of the cover frame moves up and down in view of the above problems.

In order to solve the above-mentioned problems, according to the present invention, there is provided a printer having a main body frame, a cover frame mounted on the body frame so as to be openable and closable, and a lock bar and a hook capable of locking the lock bar. The cover locking mechanism in which the cover frame in the closed state is locked on the body frame, the lock bar and the hook can slide relatively in a direction substantially parallel to the opening and closing center axis of the cover frame, and the lock bar relative to the hook Sliding in the first direction forms the locking state of the above-mentioned locking bar and the above-mentioned hook; sliding the above-mentioned locking bar relative to the above-mentioned hook to the second direction opposite to the above-mentioned first direction releases the locking state of the above-mentioned locking bar and the above-mentioned hook.

In the present invention, the locking bar slides relatively along a direction parallel to the opening and closing central axis of the cover frame to form a locked state with the hook. Therefore, unlike the case where the lock lever is rotated and locked on the hook, even if the closed position of the cover frame moves up and down, the posture of the lock lever in the locked state does not change. Therefore, it is possible to prevent the disadvantage that the locking force of the lock lever and the hook is weakened and the lock of the cover frame is released accidentally due to the fluctuation of the closed position of the cover frame.

Here, generally, it is preferable that the lock lever is provided on the cover frame and the hook is provided on the body frame from the viewpoint of ease of manufacture.

Furthermore, as a mechanism for slidably mounting the lock bar on the cover frame, there may be used a mounting portion that mounts the lock bar on the cover frame in a state that can slide only a predetermined distance, and a locking bar that is slidable in the first direction. The structure of the elastic member that applies spring force to the above-mentioned lock lever.

Next, the hook may be configured to protrude from the main body frame in the sliding direction of the lock bar at a position where it interferes with the movement locus of the lock bar as the cover frame is opened and closed. In this way, when the cover frame is closed, the lock bar contacts the hook, so the lock bar slides in the second direction in conjunction with the closing action of the cover frame. Then, after the lock bar is released from the hook, it slides in the first direction by the spring force. Therefore, the state of being locked on the hook can be automatically formed.

At this time, on the above-mentioned hook, it is only necessary to form a lock lever guide surface facing the second direction and inclined to the closing direction of the above-mentioned cover frame, and form a lock lever guide surface on the side of the closing direction of the above-mentioned cover frame with respect to the above-mentioned lock lever guide surface. The locking surface of the locking lever is sufficient. The lock lever comes into contact with the lock lever guide surface after the cover frame reaches a position near the closed state, and smoothly slides along the lock lever guide surface in the second direction as the cover frame moves to the closed state, and is disengaged from the lock lever guide surface. After the guide surface of the locking lever, the spring force of the elastic member slides in the first direction to form a state locked on the locking surface of the locking lever.

Here, it is preferable that the lock lever locking surface of the hook is an inclined surface facing the second direction and inclined at a predetermined angle in a direction in which the lid frame is opened. In this way, even if the closed position of the cover frame moves up and down, the locking surface of the locking bar mounted on the cover frame can be reliably locked on the locking bar locking surface of the hook.

Next, as the release mechanism for releasing the above-mentioned lock bar from the above-mentioned hook, that is, the release mechanism of the above-mentioned cover frame, it is possible to use a manual operation part, and to operate the above-mentioned manual operation part, then the above-mentioned lock bar locked on the above-mentioned hook is moved to the above-mentioned second. Construction of the release lever that slides in 2 directions.

In this case, a locking member having the lock lever at one end and a contact portion capable of contacting the release lever at the other end may be employed, and the release lever has a first protrusion. Thus, when the release lever is rotated by the operation of the manual operation member, the first protrusion comes into contact with the contact portion of the lock member, and the lock lever slides in the second direction.

Here, it is preferable that at least one of the contact portion of the lock member or the first projection of the release lever has a guide surface inclined in the second direction and in a direction opposite to the rotation direction of the release lever. In this way, the lock lever can be gradually slid in the second direction according to the rotation amount of the release lever, and the rotation of the release lever can be smoothly converted into the lock lever's sliding in the second direction.

Next, the release lever may have a second protrusion, and when the release lever is rotated according to the operation of the manual operation member, the first protrusion comes into contact with the contact portion of the lock member to slide the lock lever in the second direction. At the same time, the second protrusion contacts the lid frame from below to move the lid frame in the opening direction. In this way, the locking bar can be released from the hook more surely and reliably.

In addition, the present invention can be applied to a printer having a thermal head. In this case, the thermal head is provided on the body frame, and when the cover frame is closed, it is mounted on the cover frame in contact with the thermal head. The structure of the platen roller at the front end of the cover frame and the elastic member that can press the thermal head against the platen roller in the state where the cover frame is closed is sufficient.

In the printer of the present invention, a lock bar is installed on one side of the body frame and the cover frame, and a hook is installed on the other side to form a cover locking mechanism, so that the lock bar and the hook move along with the opening and closing of the cover frame. Relatively sliding in a direction approximately parallel to the opening and closing central axis of the cover frame, forming a locked state.

Therefore, according to the present invention, unlike the conventional lid lock mechanism in which the lock lever is rotated around a central axis parallel to the opening and closing central axis of the lid frame to form a locked state, even if the position of the lid frame in the closed state is up and down, The effect of the locked state can also be reliably formed.

Description of drawings

FIG. 1 is a perspective view of the appearance of a thermal printer to which the present invention is applied.

2 and 3 are perspective views showing the internal mechanism of the printer of FIG. 1 .

FIG. 4 is a schematic cross-sectional view showing an internal mechanism of the printer of FIG. 1 .

5 and 6 are perspective views showing a body frame and a cover frame of the printer shown in FIG. 1 .

Fig. 7 is a schematic view showing a half-opened state of the cover frame of the printer of Fig. 1 .

8A and 8B are explanatory diagrams illustrating the operation of the cover lock mechanism of the printer of FIG. 1 .

FIG. 9 is an explanatory view showing the operation and effect of the cover lock mechanism of the printer of FIG. 1 .

10A to 10C are explanatory diagrams for explaining a cover lock mechanism of a conventional printer, its operation, and problems.

Detailed ways

Hereinafter, preferred embodiments of a printer to which the present invention is applied will be described with reference to the drawings.

FIG. 1 is a perspective view showing the appearance of a printer according to this embodiment. The printer 1 according to this embodiment is, for example, a printer used as a receipt printer in a POS system.

In the printer 1 , components described later are provided inside a resin exterior case 4 composed of an upper case 2 and a lower case 3 . The upper surface of the upper case 2 is an inclined surface inclined so that the front side becomes lower, and a discharge port 6 for the recording paper 5 is formed on the front side of the upper surface. An opening and closing cover 7 is provided on the upper surface portion on the rear side relative to the discharge port 6 . The access cover 7 can be opened and closed centering on the rear end side, and can be opened by pressing an open button 8 (manual operation member) provided on the right side of the access cover 7 . A display panel 9 is provided at a position on the rear side of the opening button 8 . When the opening and closing cover 7 is fully opened, the loading portion 15 (see FIGS. 2 to 4 ) of the recording paper roll 5a is fully opened, and the recording paper roll 5a can be loaded into the loading portion 15 from above.

2 and 3 are diagrams showing the internal mechanism of the printer with the outer casing 4 removed. FIG. 2 is a perspective view viewed from the right side of the observer, and FIG. 3 is a perspective view viewed from the left side of the observer. In addition, FIG. 4 is a schematic cross-sectional view of the internal mechanism of the printer. The following description will be made with reference to these drawings. The printer internal mechanism 11 is composed of a main body frame 12 and a cover frame 13 rotatably attached to the main body frame 12 at a rear end portion 13a. The rear end portion 13a of the cover frame 13 can be opened and closed in the vertical direction around the opening and closing central axis 13b extending along the width direction of the printer. The opening and closing cover 7 is attached to the cover frame 13 , and the opening and closing cover 7 is opened and closed together with the opening and closing of the cover frame 13 . The upper casing 2 , the lower casing 3 , the opening button 8 and the display panel 9 are mounted on one side of the body frame 12 .

A curved resin plate 14 is attached to the rear side of the body frame 12 to form a loading portion 15 for the recording paper roll 5a. As shown in FIG. 4 , printing is performed by the thermal head 17 while the recording paper 5 fed from the recording paper roll 5 a loaded in the loading section 15 is conveyed upward through the platen roller 16 and the thermal head 17 . The printed recording paper 5 is discharged to the outside from the discharge port 6 . The thermal head 17 is supported on one side of the body frame 12 . The platen roller 16 is rotatably attached to the front end of the cover frame 13 . As shown in FIG. 4 , in a state where the cover frame 13 is closed, a state where the thermal head 17 is pressed against the platen roller 16 is formed by the pressing spring 18 .

A paper feed motor 22 is attached to the inside of the left side plate portion 21 of the body frame 12. The front end portion of the motor rotating shaft 23 protrudes outward from the side plate portion 21, and a pinion gear 24 is attached thereto. The pinion gear 24 meshes with a drive side compound gear 25 freely rotatably supported on the outside of the side plate portion 21 . In this example, the paper feed motor 22 and the drive side compound gear 25 are mounted on a mounting plate 27 fixed to the side plate portion 21 with screws 28 . The drive side compound gear 25 meshes with the driven side gear 26 on the cover frame 13 side. The driven side gear 26 is fixed to the end of the roller shaft 16 a of the platen roller 16 attached to the cover frame 13 . Therefore, when the cover frame 13 is closed, the driven side gear 26 and the driving side compound gear 25 are meshed, and the rotational force of the paper feed motor 22 can be transmitted to the platen roller 16 . When the cover frame 13 is opened, the driven side gear 26 is disengaged from the driving side compound gear 25 .

Next, an automatic shutoff device 30 is provided directly below the discharge port 6 . The automatic cutting device 30 has a movable blade unit 31 mounted on one side of the body frame 12 and a fixed blade 32 mounted on the upper surface of the front end portion of the cover frame 13 . The fixed blade 32 extends in the width direction of the printer, and the movable blade 31 a of the movable blade unit 31 is rotatable toward the fixed blade 32 around one end in the width direction of the printer by the drive motor 33 . By rotating the movable blade 31a, the printed recording paper 5 can be cut and discharged as a receipt or the like.

Next, a lock mechanism 40 for locking the closed lid frame 13 to the body frame 12 is formed between the body frame 12 and the cover frame 13 . Next, the lock mechanism 40 of this example will be described with reference to FIGS. 2 to 6 . Fig. 5 and Fig. 6 are the figures that take out the body frame 12 and the cover frame 13 of the internal mechanism 11 of the printer, and Fig. 5 is a perspective view when the cover frame 13 is in a half-open state seen from the right side of the observer's side, FIG. 6 is a perspective view of the cover frame 13 in a half-open state viewed from the left side on the observer side.

The lock mechanism 40 of this example has a lock plate 41 (lock lever member) attached to the front end of the cover frame 13 and a hook 42 attached to the left side plate portion 21 of the body frame 12 . The lock plate 41 has a horizontal plate portion 43 extending horizontally in the width direction of the printer from the upper side of the front end portion of the cover frame 13 , and a lock bar 44 bent downward at a right angle from the left end of the horizontal plate portion 43 and extending downward. , and a rod 45 bent downward at right angles from the right end of the horizontal plate portion 43 and extending therefrom.

At the left and right end portions of the horizontal plate portion 43, as shown in FIG. 3, elongated long holes 43a, 43b are formed in the width direction of the printer. Columnar guide pins 48a, 48b fixed to the front end portion of the cover frame 13 pass through the elongated holes 43a, 43b. Therefore, the lock plate 41 can slide within a predetermined range in the width direction of the printer (direction parallel to the central axis of the opening and closing central axis 13b) through the mounting portion formed by the elongated holes 43a, 43b and the guide pins 48a, 48b. In this example, by employing cup screws as the guide pins 48a, 48b, the lock plate 41 is slidably supported, and the lock plate 41 is prevented from coming out upward.

In addition, between the right end portion of the front end portion of the cover frame 13 and the horizontal plate portion 43 of the lock plate 41, a coil spring 47 is stretched in a stretched state. Therefore, the lock plate 41 is kept in a state of always being biased to the right.

The lock lever 44 of the lock plate 41 extends downward from the outside of the left end of the cover frame 13 . At the lower end portion of the lock lever 44 is formed a concave portion 51 formed by cutting out the front of the printer from the end surface on the rear side of the printer. The recess 51 is defined by an inclined end surface portion 51a inclined toward the front side of the printer, a vertical end surface portion 51b connected to the lower end and extending downward, and a horizontal end surface portion 51c extending from the lower end in a direction perpendicular to the rear side of the printer. . The horizontal end surface portion 51c functions as a locking surface for locking with the hook 42 .

Also, the hook 42 is provided at a position where it interferes with the locus of movement of the front end portion 44a lower than the lock surface (horizontal end surface portion) 51c of the lock lever 44 as the cover frame 13 is opened and closed. The hook 42 is in the shape of a boss protruding outward at a right angle from the left side plate portion 21 of the body frame 12 . In this example, the hook 42 is formed by bending the upper end portion of the mounting plate 27 forward and backward. The hook 42 of boss shape, its upper end surface is the guide surface 42a that inclines downward, and forms the vertical top surface 42b that is connected with the lower end of this guide surface 42a, extends vertically downward, and the lower end of this vertical top surface 42b The locking surface 42c of the connecting, downwardly inclined locking bar.

Next, the operation of locking the cover frame 13 by the locking mechanism 40 configured in this way will be described with reference to FIGS. 7 , 8A and 8B. FIG. 7 is a schematic view showing a state where the lid frame 13 is half-opened, and FIGS. 8A and 8B are explanatory views for explaining the operation of the lock mechanism 40 . As shown in FIG. 7, the cover frame 13 is opened. In this state, the lock plate 41 is biased to the right by the coil spring 47 (position A in FIG. 8A ). When the cover frame 13 is closed, the front end portion 44a of the lock bar 44 of the lock plate 41 contacts the hook 42 on one side of the body frame 12 (position B in FIGS. 8A and 8B ). When the cover frame 13 is further closed, the front end portion 44a of the locking bar 44 contacts on the hook 42 along the inclined guide surface 42a on the upper side of the hook 42, and overcomes the spring force of the coil spring 47 so that the entire locking plate 41 moves toward the upper side of the hook 42. Slide to the left to move to the closing direction (the position of C in Figure 8A and Figure 8B). Close the cover frame 13 until the locking surface 51c of the locking bar 44 crosses the vertical top surface 42b of the hook 42, the hook 42 is embedded in the recess 51 of the locking bar 44, and the locking plate 41 slides to the right as a whole by spring force. As a result, the lock surface 51c of the lock bar 44 is locked on the lock bar lock surface 42c of the hook 42 from below (position D in FIGS. 8A and 8B ). As a result, the lid frame 13 is locked to the main body frame 12 . That is, as the cover frame 13 (opening and closing cover 7 ) is closed, the lock lever 44 (lock plate 41 ) moves as indicated by the arrow T and is locked on the hook 42 .

Here, when the position of the fully closed cover frame 13 fluctuates up and down due to assembly errors or manufacturing errors, as shown by D1, D2, and D3 in FIG. The position changes up and down.

However, in this example, the lock lever 44 slides in the width direction of the printer, and the hook 42 is fitted into the recess 51 thereof. Therefore, even if the lock surface 51c of the lock lever 44 moves up and down, the angle between the lock surface 51c and the lock lever lock surface 42c of the hook 42 (lock angle θ) does not change.

In addition, in this example, the lock lever locking surface 42c is an inclined surface inclined only slightly upward. Therefore, even if the position of the cover frame 13 in the closed state fluctuates up and down, the locking surface 51c of the locking lever 44 can be surely and reliably locked on the locking lever locking surface 42c of the hook 42 . Also, even if the position of the lid frame 13 in the closed state moves upward, the lock angle θ does not increase and the lock force does not decrease, so that the lock can be released easily.

Next, the release mechanism for releasing the lock by the lock mechanism 40 of the printer 1 of this example will be described. Description will be given with reference to FIGS. 1 to 6 . The release mechanism 60 has the aforementioned manual opening button 8 , a rotary release lever 62 provided on the right side plate portion 61 of the body frame 12 , and a contact portion 46 formed on the lever 45 of the lock plate 41 . The opening button 8 receives a spring force applied upward by a coil spring or the like, and the release lever 62 receives a spring force applied in a counterclockwise direction by a torsion spring or the like, and is located at the position shown in FIG. 2 .

The release lever 62 is rotatable in the vertical direction around the rotation center shaft 62a, and has protrusions 63, 64 protruding rearward and upward from the rotation center shaft 62a, respectively. On the protrusion 64 (first protrusion), an inclined surface 64a inclined toward the side plate portion 61 is formed. When the opening button 8 is pressed, the contact surface 8a formed on the lower side of the opening button 8 presses the protrusion 63 of the release lever 62 downward, thereby rotating the release lever 62 clockwise. When the release lever 62 rotates, the contact portion 46 of the lock plate 41 is pressed inward in the width direction of the printer by the inclined surface 64 a of the protrusion 64 . As a result, the lock plate 41 slides to the left against the spring force of the coil spring 47 . In this way, the lock lever 44 of the lock plate 41 is disengaged from the hook 42 to the side.

In addition, on the release lever 62, a protrusion 65 (second protrusion) protruding forward from the rotation center shaft 62a is formed. After the locking lever 44 is disengaged from the hook 42 to the side, if the release lever 62 is rotated further, the projection 65 contacts the lower surface 13c of the cover frame 13 from below, and the cover frame 13 is lifted upward.

Therefore, by sliding the lock plate 41 and lifting the cover frame 13 , the lock by the lock mechanism 40 is released, and the cover frame 13 (opening and closing cover 7 ) can be opened.

Although the printer 1 described above is a thermal printer, the present invention is equally applicable to a printer having an inkjet head, an impact head, or the like.

In addition, although in the above-mentioned example, the lock lever is slidably installed on the side of the cover frame and the hook is installed on the side of the body frame, it is also possible to install the hook on the side of the cover frame and the lock to be slidably installed on the side of the body frame. pole.

In addition, although the lock lever is configured to be slidable in the above example, the hook is also configured to be slidable.

In addition, in the above-mentioned example, an inclined surface is formed on one side of the release lever, but an inclined surface may be formed on a contact surface of the lock lever, or an inclined surface may be formed on both sides.

Claims (11)

1. A printer, characterized in that: With ontology framework (12), a cover frame (13) openably and closably mounted on the body frame, and a lid locking mechanism for locking said lid frame in a closed state to said body frame having a locking bar (44) and a hook (42) capable of locking said locking bar, The lock bar and the hook are relatively slidable in a direction substantially parallel to the opening and closing central axis of the cover frame, The lock bar slides in a first direction relative to the hook to form a locked state between the lock bar and the hook; the lock bar slides in a second direction opposite to the first direction relative to the hook , the locked state of the lock bar and the hook is released. 2. The printer according to claim 1, characterized in that: The lock bar is arranged on the cover frame, and the hook is arranged on the body frame. 3. The printer according to claim 2, characterized in that: It also has a mounting part (43a, 48a, 43b, 48b) for mounting the lock bar on the cover frame in a state of being slidable by a predetermined distance, and A spring member (47) that applies a spring force to the lock lever in the first direction. 4. The printer according to claim 3, characterized in that: The hook protrudes from the main body frame in a sliding direction of the lock bar at a position where it interferes with a moving locus of the lock bar due to opening and closing of the cover frame. 5. The printer according to claim 4, characterized in that: The hook has a lock bar guide surface (42a) facing the second direction and inclined to the closing direction of the cover frame, and a locking bar guide surface (42a) on the side of the cover frame closing direction relative to the lock bar guide surface. Formed locking bar locking surface (42c), The lock bar is in contact with the guide surface of the lock bar after the cover frame reaches a position near the closed state, and moves along the guide surface of the lock bar along the guide surface of the lock bar as the cover frame moves to the closed state. Sliding in 2 directions, after breaking away from the guiding surface of the locking rod, sliding in the first direction by the spring force of the elastic member, forming a state of being locked on the locking surface of the locking rod. 6. The printer according to claim 5, characterized in that: The lock bar locking surface of the hook is an inclined surface facing the second direction and inclined at a predetermined angle in a direction in which the lid frame is opened. 7. The printer according to claim 4, characterized in that: Also has manual operation parts (8), and A release lever (62) that slides the lock lever locked on the hook in the second direction by operating the manual operation member. 8. The printer according to claim 7, characterized in that: It also has a locking part (41) with the lock lever at one end and a contact portion (46) that can contact the release lever at the other end, The release lever has a first protrusion (64), When the release lever is rotated by the operation of the manual operation member, the first protrusion comes into contact with the contact portion of the lock member, and the lock lever slides in the second direction. 9. The printer according to claim 8, characterized in that: At least one of the contact portion of the lock member or the first projection of the release lever has a guide surface that faces the second direction and is inclined in a direction opposite to the rotation direction of the release lever. (64a). 10. The printer of claim 8, wherein: The release lever has a second protrusion (65), and when the release lever is rotated according to the operation of the manual operation member, the first protrusion comes into contact with the contact portion of the lock member, and the lock lever moves toward Simultaneously with the sliding in the second direction, the second protrusion contacts the cover frame from below to move the cover frame in the opening direction. 11. The printer according to any one of claims 1-10, characterized in that: It also has a thermal head (17) arranged on the body frame, A platen roller (16) installed at the front end of the cover frame in contact with the thermal head when the cover frame is closed, and An elastic member (18) that can press the thermal head against the platen roller in a state where the cover frame is closed.

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