JP2004255865A - Printer with cover lock mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose a cover lock mechanism for a printer, by which a cover frame can be securely locked to a printer frame, even if the position of the cover frame in a closed condition moves up and down. <P>SOLUTION: The cover frame 13 of the printer 1 is mounted to the printer frame 12 so as to be openable and closable at its rear edge acting as the center. The cover frame 13 is locked to the printer frame 12 by a lock mechanism 40. The lock mechanism 40 has a lock lever 44 and a hook 42. The lock lever 44 is arranged on the left edge of a lock plate 41, which is mounted slidably from side to side on the front edge of the cover frame 13. The hook 42 is arranged on the printer frame 12. When the cover frame 13 is closed, after the lock lever 44 hits the hook 42, the lock lever 44 goes over the hook 42 while the lock plate 41 slides to the left side, and then the lock lever 44 slides to the right side. Thereby, a securing surface 51c of the lock lever 44 is secured to the lock lever securing surface 42c of the hook 42 from the bottom, and a locking state is formed. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a printer used for a POS system, a cash register, and the like. More specifically, the present invention relates to a cover lock mechanism for locking a cover frame to a main body frame in a printer in which a cover frame is openably and closably mounted on the main body frame of the printer.

  In POS systems and the like, thermal printers that perform printing on roll paper are widely used. This type of printer has a structure in which the cover frame is attached to the printer body frame so that it can be opened and closed, and when the cover frame is opened, the roll paper loading section is fully opened, making it easy to replace the roll paper. It has been known. In addition, the platen roller is attached to the tip of the cover frame, and when the cover frame is opened, the platen roller can be separated from the thermal head and the work of setting the roll paper between them can be simplified. Is also known.

  In general, a printer having such a cover frame has a cover lock mechanism for locking the cover frame to the main body frame so that the cover frame is not opened carelessly. In particular, in a printer that can reversely feed recording paper such as roll paper, a cover lock mechanism is indispensable because the cover frame is easily opened at the time of reverse feeding.

  A cover lock mechanism used in the related art generally includes a lock lever 102 attached to a cover frame 101 and a hook 104 attached to a body frame 103, as shown in FIG. Have. The lock lever 102 is attached to the cover frame 101 such that the upper end thereof is rotatable about a rotation center axis 102a parallel to the rotation center axis 101a of the cover frame 101, and is rotatable in the front-rear direction. A hook 104 formed on the side of the main body frame 103 is disposed on a movement trajectory of the tip of the lock lever 102 due to opening and closing of the cover frame 101. The lock lever 102 is always engaged with the hook 104 by a torsion spring or the like. It is urged to the stop side.

  When the cover frame 101 is closed, the tip of the lock lever 102 hits the hook 104, and thereafter the lock lever 102 once turns counterclockwise to get over the hook 104. As shown in FIG. 10B, when the cover frame 101 is completely closed, the locking surface 102b formed at the tip of the lock lever 102 locks the lower surface 104a of the hook 104 from below. A locked state is established.

  Further, a platen roller 105 is attached to the tip of the cover frame 101, and when the cover frame 101 is closed, the platen roller 105 comes into contact with the surface of the thermal head 106 disposed on the main body frame 103 side. State.

  A printer provided with a cover lock mechanism having such a structure is disclosed in, for example, the following patent document.

JP-A-9-240083 (see FIGS. 6 and 7)

  However, the cover lock mechanism having the above configuration has the following problems. The closed position of the cover frame 101 is defined, for example, by a bearing 107 that receives the rotating shaft 105a of the platen roller 105 formed on the cover frame 101, as shown in FIG. If there is a manufacturing error in the cover frame 101 or an error in the position of the bearing 107, the closing position of the cover frame 101 changes. In particular, the closing position of the cover frame 101 tends to fluctuate up and down.

  When the closing position of the cover frame 101 moves up and down, the relative position between the lock lever 102 attached to the cover frame 101 and the hook 104 on the body frame 103 changes. In particular, when the closed position of the cover frame 101 is shifted upward, the locking surface 102b of the lock lever 102 cannot sufficiently enter the lower side of the hook 104 as shown in FIG. As a result, the lock lever 102 assumes a posture inclined rearward as compared with the posture in a state where the lock lever 102 is appropriately locked (FIG. 10B), and the angle of the lock surface 102b with respect to the lower surface 104a of the hook 104 (lock angle). θ) becomes large. Therefore, the locking force between the lock lever 102 and the hook 104 is weakened, and the lock is easily released.

  In view of the above, an object of the present invention is to propose a printer including a cover lock mechanism that can securely lock a cover frame to a main body frame side even when the cover frame closes up and down. It is in.

  In order to solve the above problems, the present invention provides a body frame, a cover frame attached to the body frame so as to be openable and closable, and a cover for locking the cover frame in a closed state to the body frame. In a printer having a lock mechanism, the cover lock mechanism includes a lock lever and a hook that can lock the lock lever, and the lock lever and the hook are substantially aligned with an opening / closing center axis of the cover frame. The lock lever is slidable in a parallel direction relative to the hook, and the lock lever slides in a first direction with respect to the hook to form a locked state of the lock lever and the hook, and the lock lever is When the hook is slid in a second direction opposite to the first direction with respect to the hook, an engagement between the lock lever and the hook is established. It is characterized in that the state is to be released.

  According to the present invention, the lock lever is relatively slid in the direction parallel to the opening / closing center axis of the cover frame, and the locked state with the hook is formed. Therefore, unlike the case where the lock lever pivots and locks the hook, the posture of the lock lever in the lock state does not change even if the closing position of the cover frame changes up and down. Therefore, it is possible to prevent the locking force between the lock lever and the hook from weakening due to the change in the closing position of the cover frame, and to prevent the lock frame from being inadvertently released.

  Here, it is generally desirable to arrange the lock lever on the cover frame and arrange the hook on the main body frame from the viewpoint of ease of manufacture and the like.

  Further, as a mechanism for slidably attaching the lock lever to the cover frame, an attaching portion that attaches the lock lever to the cover frame so that the lock lever can be slid by a predetermined distance; And a biasing member that biases the member.

  Next, a configuration may be employed in which the hook protrudes from the main body frame in a sliding direction of the lock lever at a position where the hook interferes with a movement trajectory of the lock lever accompanying opening and closing of the cover frame. With this configuration, when closing the cover frame, the lock lever hits the hook, so that the lock lever slides in the second direction in conjunction with the closing operation of the cover frame. Thereafter, when the lock lever is released from the hook, the lock lever slides in the first direction by the urging force. Therefore, the state of being locked to the hook can be automatically formed.

  In this case, the hook has a lock lever guide surface that is inclined in the closing direction of the cover frame toward the second direction, and a hook in the closing direction of the cover frame with respect to the lock lever guide surface. The formed lock lever locking surface may be formed. The lock lever comes into contact with the lock lever guide surface when the cover frame reaches a position near the closed state, and moves along the lock lever guide surface along the lock lever guide surface with movement of the cover frame to the closed state. And slides in the first direction by the urging force of the urging member when it comes off the guide surface of the lock lever, so that the lock lever is locked to the lock lever locking surface. .

  Here, it is preferable that the lock lever engagement surface of the hook is an inclined surface inclined at a predetermined angle in the opening direction of the cover frame toward the second direction. With this configuration, even if the cover frame is moved up and down, the locking surface of the lock lever attached to the cover frame can be securely locked to the lock lever locking surface of the hook.

  Next, as a mechanism for releasing the lock lever from the hook, that is, as a lock release mechanism for the cover frame, a manual operation member and, when the manual operation member is operated, the lock lever locked to the hook And a lock release lever for sliding the lock lever in the second direction.

  In this case, one end has the lock lever, and the other end has a lock member having a contact portion capable of contacting the lock release lever, and the lock release lever has a first protrusion. Can be adopted. With this configuration, the lock release lever rotates in response to the operation of the manual operation member, and the first protrusion contacts the contact portion of the lock member, so that the lock lever moves in the second direction. Slide.

  Here, at least one of the contact portion of the lock member or the first protrusion of the lock release lever is inclined in the direction opposite to the rotation direction of the lock release lever toward the second direction. It is desirable to have a guide surface that is in place. With this configuration, the lock lever can be gradually slid in the second direction in accordance with the amount of rotation of the lock release lever, and the rotation of the lock release lever can be smoothly changed to the slide of the lock lever in the second direction. Can be converted.

  Next, the lock release lever has a second projection, and the lock release lever rotates in response to the operation of the manual operation member, whereby the first projection is brought into contact with the contact portion of the lock member. A configuration in which the lock lever slides in the second direction in contact with the cover frame, and the second protrusion contacts the cover frame from below to move the cover frame in the opening direction. it can. With this configuration, the lock lever can be more reliably released from the hook.

  On the other hand, the present invention can be applied to a printer having a thermal head.In this case, the thermal head disposed on the main body frame and the thermal head when the cover frame is closed are brought into contact with the thermal head. What is necessary is just to comprise the platen roller attached to the front-end | tip part of a cover frame, and the elastic member which can press the said thermal head against the said platen roller in the closed state of the said cover frame.

  In the printer of the present invention, a lock lever is attached to one side of the main body frame and the cover frame, and a hook is attached to the other side to form a cover lock mechanism. The lock lever and the hook are relatively opened and closed by opening and closing the cover frame. Specifically, the cover frame is slid in a direction substantially parallel to the opening / closing center axis to form a locked state.

  Therefore, according to the present invention, unlike the conventional cover lock mechanism in which the lock lever is turned around the central axis parallel to the open / close central axis of the cover frame to form the lock state, the lock lever is closed in the closed state of the cover frame. Even if the position fluctuates up and down, there is an effect that the locked state can be reliably formed.

  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 the printer according to the present embodiment. The printer 1 according to the present embodiment is used as a receipt printer in a POS system, for example.

  In the printer 1, components described later are arranged inside a resin outer case 4 including an upper case 2 and a lower case 3. The upper surface of the upper case 2 is an inclined surface which is inclined so that the front side is lower, and a discharge port 6 for the recording paper 5 is formed in a front portion of the upper surface. The upper surface portion behind the discharge port 6 is an opening / closing cover 7. The opening / closing cover 7 can be opened / closed about a portion on the rear end side, and can be opened by pressing an open button 8 (manual operation member) arranged on the right side of the opening / closing cover 7. A display panel 9 is arranged behind the open button 8. When the cover 7 is fully opened, the loading section 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 section 15 from above.

  2 and 3 are views showing the internal mechanism of the printer with the outer case 4 removed. FIG. 2 is a perspective view when viewed from the front right side, and FIG. 3 is a perspective view when viewed from the front left side. FIG. 4 is a schematic sectional view of the internal mechanism of the printer. With reference to these drawings, the printer internal mechanism 11 is mainly composed of a main body frame 12 and a cover frame 13 in which a rear end portion 13a is rotatably attached to the main body frame 12. A rear end portion 13a of the cover frame 13 can be opened and closed in a vertical direction about an opening and closing central shaft 13b extending in the printer width direction. The open / close cover 7 is attached to the cover frame 13, and the open / close cover 7 opens and closes as the cover frame 13 opens and closes. The upper case 2, the lower case 3, the open button 8 and the display panel 9 are attached to the body frame 12.

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

  A paper feed motor 22 is mounted inside the left side plate portion 21 of the main body frame 12, and a tip portion of the motor rotation shaft 23 projects outward from the side plate portion 21, and a pinion 24 is mounted here. . The pinion 24 meshes with a driving compound gear 25 rotatably supported outside the side plate portion 21. In this example, the paper feed motor 22 and the driving compound gear 25 are mounted on a mounting plate 27, and the mounting plate 27 is fixed to the side plate portion 21 by screws 28. The drive-side compound gear 25 meshes with a driven-side gear 26 on the cover frame 13 side. The driven gear 26 is fixed to the end of the roller shaft 16 a of the platen roller 16 mounted on the cover frame 13. Accordingly, when the cover frame 13 is closed, a state is formed in which the driven gear 26 meshes with the driving compound gear 25, 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 gear 26 separates from the driving compound gear 25.

  Next, an automatic cutter unit 30 is disposed immediately below the discharge port 6. The auto cutter unit 30 includes a movable blade unit 31 mounted on the body frame 12 side, and a fixed blade 32 mounted on the upper surface of the front end of the cover frame 13. The fixed blade 32 extends in the printer width direction, and the movable blade 31a of the movable blade unit 31 can be turned around the one end in the printer width direction toward the fixed blade 32 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 cover frame 13 in the closed state to the main body frame 12 is formed between the main body frame 12 and the cover frame 13. The lock mechanism 40 of the present embodiment will be described with reference to FIGS. 5 and 6 are views showing the main body frame 12 and the cover frame 13 of the printer internal mechanism 11 taken out. FIG. 5 is a perspective view when the cover frame 13 is opened halfway from the right front side, and FIG. FIG. 9 is a perspective view when the cover frame 13 is half-open when viewed from the left front side.

  The lock mechanism 40 of this example includes a lock plate 41 (lock member) mounted on the front end of the cover frame 13 and a hook 42 mounted on the left side plate portion 21 of the main body frame 12. The lock plate 41 includes a horizontal plate portion 43 that extends horizontally above the front end of the cover frame 13 in the printer width direction, and a lock lever 44 that is bent downward at a right angle from the left end of the horizontal plate portion 43 and extends. And a lever 45 that is bent downward at a right angle from the right end of the horizontal plate portion 43 and extends.

  As shown in FIG. 3, long holes 43a and 43b long in the width direction of the printer are formed at left and right end portions of the horizontal plate portion 43. Cylindrical guide pins 48a, 48b fixed to the front end of the cover frame 13 pass through these long holes 43a, 43b. Therefore, the lock plate 41 can be slid within a predetermined range in the printer width direction (the direction parallel to the central axis of the opening / closing central shaft 13b) by the mounting portion including the elongated holes 43a and 43b and the guide pins 48a and 48b. is there. In this example, by employing flanged screws (cup screws) as the guide pins 48a and 48b, the lock plate 41 is slidably supported, and the lock plate 41 is prevented from being pulled out.

  A coil spring 47 is stretched 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 in a tensioned state. Therefore, the lock plate 41 is always held in a state of being deviated 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 of the lock lever 44, a concave portion 51 is formed by notching the front end of the printer from the rear end surface thereof. The concave portion 51 has an inclined end surface portion 51a inclined toward the front of the printer, a vertical end surface portion 51b extending downward continuously from the lower end, and a horizontal end surface portion 51c extending from the lower end in a direction orthogonal to the rear side of the printer. As defined by The horizontal end surface portion 51c functions as a locking surface for locking the hook 42.

  On the other hand, the hook 42 is disposed at a position where the hook 42 interferes with the movement trajectory of the distal end portion 44a below the locking surface (horizontal end surface portion) 51c of the lock lever 44 due to opening and closing of the cover frame 13. The hook 42 has a trapezoidal shape protruding outward at right angles from the left side plate portion 21 of the main body frame 12. In this example, the hook 42 is formed by bending the upper end portion of the mounting plate 27 in the front-rear direction. The upper end surface of the trapezoidal hook 42 is a guide surface 42a inclined downward, and a vertical top surface 42b extending vertically downward continuously to the lower end of the guide surface 42a is formed. A lock lever locking surface 42c is formed at the lower end of the top surface 42b so as to be continuously inclined downward.

  Next, an operation of locking the cover frame 13 by the lock mechanism 40 configured as described above will be described with reference to FIGS. FIG. 7 is a schematic diagram showing a state in which the cover frame 13 is half-open, and FIG. 8 is an explanatory diagram showing the operation of the lock mechanism 40. It is assumed that the cover frame 13 is open as shown in FIG. In this state, the lock plate 41 is biased rightward by the coil spring 47 (position A in FIG. 8). When the cover frame 13 is closed, the distal end portion 44a of the lock lever 44 of the lock plate 41 comes into contact with the hook 42 on the main body frame 12 (the position B in FIG. 8). When the cover frame 13 is further closed, the distal end portion 44a of the lock lever 44 rides on the hook 42 along the inclined guide surface 42a on the upper side of the hook 42, and the lock plate 41 as a whole is opposed to the spring force of the coil spring 47. It slides to the left and moves in the closing direction (position C in FIG. 8). When the cover frame 13 is closed until the locking surface 51c of the lock lever 44 exceeds the vertical top surface 42b of the hook 42, the hook 42 fits into the concave portion 51 of the lock lever 44, and the lock plate 41 is moved rightward as a whole by the spring force. Slide. As a result, a state is formed in which the locking surface 51c of the lock lever 44 is locked from below on the lock lever locking surface 42c of the hook 42 (position D in FIG. 8). As a result, the cover frame 13 is locked to the main body frame 12. That is, with the closing operation of the cover frame 13 (opening / closing cover 7), the lock lever 44 (lock plate 41) moves as shown by the arrow T and is locked by the hook 42.

  Here, when the position of the cover frame 13 in the completely closed state fluctuates up and down due to an assembling error, a manufacturing error, or the like, as shown by D1, D2, and D3 in FIG. The position of the lever 44 moves 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 concave portion 51 thereof. Therefore, even if the locking surface 51c of the lock lever 44 moves up and down, the angle (locking angle θ) between the locking surface 51c and the lock lever locking surface 42c of the hook 42 does not change.

  Further, in this example, the lock lever locking surface 42c is an inclined surface slightly inclined upward. Therefore, even if the position of the cover frame 13 in the closed state changes up and down, the locking surface 51c of the lock lever 44 is reliably locked to the lock lever locking surface 42c of the hook 42. Further, even if the position of the cover frame 13 in the closed state changes upward, the locking angle θ is increased, the locking force is reduced, and the lock does not easily come off.

  Next, a lock release mechanism for releasing the lock by the lock mechanism 40 in the printer 1 of the present embodiment will be described. Referring to FIGS. 1 to 6, the lock release mechanism 60 includes a manual open button 8 and a rotary lock release lever 62 disposed on the right side plate 61 of the main body frame 12. And a contact portion 46 formed on the lever 45 of the lock plate 41. The open button 8 is urged upward by a coil spring or the like, and the lock release lever 62 is urged counterclockwise by a torsion spring or the like, and is located at the position shown in FIG.

  The lock release lever 62 is rotatable up and down around a rotation center axis 62a, and includes projections 63 and 64 extending rearward and upward from the rotation center axis 62a, respectively. The projection 64 (first projection) has an inclined surface 64 a that is inclined in a direction approaching the side plate portion 61. When the open button 8 is depressed, the contact surface 8a formed on the lower side of the open button 8 pushes down the protrusion 63 of the unlock lever 62, whereby the unlock lever 62 rotates clockwise. When the lock release lever 62 rotates, the contact portion 46 of the lock plate 41 is pushed inward in the printer width direction by the inclined surface 64 a of the projection 64. As a result, the lock plate 41 slides leftward against the spring force of the coil spring 47. As a result, the lock lever 44 of the lock plate 41 is released from the hook 42 to the side.

  The lock release lever 62 has a protrusion 65 (second protrusion) extending forward from the rotation center shaft 62a. When the lock release lever 62 further rotates after the lock lever 44 is disengaged from the hook 42 to the side, the protrusion 65 hits the lower surface 13c of the cover frame 13 from below and pushes up the cover frame 13.

  Therefore, by the sliding of the lock plate 41 and the operation of pushing up the cover frame 13, the lock by the lock mechanism 40 is released, and the cover frame 13 (openable cover 7) can be opened.

(Other embodiments)
Although the printer 1 is a thermal printer, the present invention can be similarly applied to a printer including an inkjet head, an impact head, and the like.

  In the above example, the lock lever is slidably attached to the cover frame and the hook is attached to the body frame. However, the hook is attached to the cover frame and the lock lever is slid to the body frame. It may be attached as possible.

  Furthermore, in the above example, the lock lever is configured to be slidable, but the hook may be configured to be slidable.

  Further, in the above-described example, the inclined surface is formed on the lock release lever side. However, an inclined surface may be formed on the contact portion of the lock lever, or the inclined surfaces may be formed on both sides.

FIG. 1 is an external perspective view of a thermal printer to which the present invention has been applied. FIG. 2 is a perspective view illustrating an internal mechanism of the printer in FIG. 1. FIG. 2 is a perspective view illustrating an internal mechanism of the printer in FIG. 1. FIG. 2 is a schematic sectional view illustrating an internal mechanism of the printer in FIG. 1. FIG. 2 is a perspective view illustrating a main body frame and a cover frame of the printer in FIG. 1. FIG. 2 is a perspective view illustrating a main body frame and a cover frame of the printer in FIG. 1. FIG. 2 is a schematic diagram showing a state in which a cover frame in the printer of FIG. 1 is half-open. FIG. 2 is an explanatory diagram illustrating an operation of a cover lock mechanism in the printer of FIG. 1. FIG. 2 is an explanatory diagram illustrating an operation effect of a cover lock mechanism in the printer of FIG. 1. FIG. 10 is an explanatory diagram showing a cover lock mechanism, its operation, and problems in a conventional printer.

Explanation of reference numerals

Reference Signs List 1 printer, 4 outer case, 5 recording paper, 5a recording paper roll, 6 discharge port, 7 open / close cover, 8 open button, 11 printer internal mechanism, 12 main body frame, 13 cover frame, 13b open / close central axis, 15 loading section, 16 platen roller, 17 thermal head, 18 pressing spring, 30 auto cutter unit, 40 lock mechanism, 41 lock plate, 42 hook, 42a guide surface, 42c lock lever locking surface, 43 horizontal plate portion, 43a, 43b long hole, 44 lock lever, 44a distal end portion of lock lever, 45 lever, 46 contact portion, 47 coil spring, 48a, 48b guide pin, 51 recess, 51c locking surface, 60 lock release mechanism, 62 lock release lever, 63 projection, 64 projections, 64a inclined surface, 65 projections

Claims (11)

A printer having a body frame (12), a cover frame (13) attached to the body frame so as to be openable and closable, and a cover lock mechanism for locking the cover frame in a closed state to the body frame. ,
The cover lock mechanism includes a lock lever (44) and a hook (42) on which the lock lever can be locked.
The lock lever and the hook are relatively slidable in a direction substantially parallel to an opening / closing center axis of the cover frame,
The lock lever slides in a first direction with respect to the hook to form a locked state between the lock lever and the hook, and the lock lever is opposite to the hook in the first direction. A printer with a cover lock mechanism, wherein the locked state of the lock lever and the hook is released when slid in a second direction. In claim 1,
The lock lever is disposed on the cover frame,
The said hook is arrange | positioned at the said main body frame, The printer with a cover lock mechanism characterized by the above-mentioned. In claim 2,
Mounting portions (43a, 48a, 43b, 48b) for mounting the lock lever on the cover frame so as to be slidable by a predetermined distance;
A biasing member (47) for biasing the lock lever in the first direction, the printer having a cover lock mechanism. In claim 3,
The printer with a cover lock mechanism, wherein the hook protrudes from the main body frame in a sliding direction of the lock lever at a position where the hook interferes with a movement locus of the lock lever due to opening and closing of the cover frame. In claim 4,
The hook is formed on a lock lever guide surface (42a) inclined in the closing direction of the cover frame toward the second direction, and on a side of the cover frame in the closing direction with respect to the lock lever guide surface. And a locking lever locking surface (42c).
The lock lever comes into contact with the lock lever guide surface when the cover frame reaches a position near the closed state, and moves along the lock lever guide surface along with the lock lever guide surface as the cover frame moves to the closed state. , And slides in the first direction by the urging force of the urging member when it comes off the lock lever guide surface, and is brought into a state of being locked to the lock lever locking surface. Printer with cover lock mechanism. In claim 5,
The printer with a cover lock mechanism, wherein the lock lever locking surface of the hook is an inclined surface inclined at a predetermined angle in the opening direction of the cover frame toward the second direction. In claim 4,
A manual operation member (8),
A lock release lever (62) for sliding the lock lever locked to the hook in the second direction when the manual operation member is operated. . In claim 7,
A lock member (41) provided with an abutting portion (46) capable of abutting on the lock lever at one end and the unlocking lever at the other end;
The lock release lever includes a first protrusion (64);
When the lock release lever rotates in response to the operation of the manual operation member, the first projection comes into contact with the contact portion of the lock member, and the lock lever slides in the second direction. A printer with a cover lock mechanism. In claim 8,
At least one of the contact portion of the lock member and the first protrusion of the lock release lever is inclined in the direction opposite to the rotation direction of the lock release lever toward the second direction. A printer with a cover lock mechanism, comprising a surface (64a). In claim 8,
The lock release lever includes a second protrusion (65), and when the lock release lever rotates in response to the operation of the manual operation member, the first protrusion comes into contact with the contact portion of the lock member. A cover that slides the lock lever in the second direction in contact with the cover frame, and the second protrusion contacts the cover frame from below to move the cover frame in the opening direction. Printer with lock mechanism. In any one of claims 1 to 10,
A thermal head (17) disposed on the main body frame;
A platen roller (16) attached to a tip end of the cover frame so as to contact the thermal head when the cover frame is closed;
An elastic member (18) capable of pressing the thermal head against the platen roller when the cover frame is closed, the printer having a cover lock mechanism.

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