JP2005324374A - Printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printer having a comparatively simple structure wherein a thermal head section can be readily attached or detached when the thermal head is replaced. <P>SOLUTION: In this label printer 1, a thermal head assembly 10 can be detached from a head frame 30 when a head attachment member 31 is disposed on a head detachment/attachment position so that it is possible to readily replace the thermal head assembly 10 without using a tool. When the head attachment member 31 is disposed on a head fixing position, the thermal head assembly 10 can be fixed to an adequate position. In this fixing condition, as the thermal head 11 is pressed against a printing medium by virtue of urging force of springs 71, 72, deviation of the urging force due to the replacement of the thermal head assembly 10 does not occur by adequately adjusting the urging force of the springs 71, 72. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a printer device such as a label printer that carries out printing while pulling out a printed material such as an adhesive label wound in a roll shape and press-contacting it with a thermal head.

  2. Description of the Related Art Conventionally, there has been provided a printer device that performs printing while a printing object (thermal paper or plain paper / thermal transfer ribbon) is brought into pressure contact with a thermal head and conveyed. Among such printer apparatuses, a label printer widely used in a POS system or the like is configured such that an adhesive label wound in a roll shape is sandwiched between a thermal head and a platen roller, and pulled out by friction between the adhesive label and the platen roller. It is transported and printing is performed with the printing surface of the adhesive label pressed against the thermal head.

FIG. 14 is a diagram illustrating an example of a current label printer. (A) is an overall perspective view, and (B) is an exploded perspective view of a thermal head assembly.
A label printer 101 illustrated in FIG. 14A includes a casing 103. The upper surface and one side surface of the casing 103 are a cover 105 that can be opened and closed. Inside the casing 103, an accommodation space 101A for accommodating an adhesive label wound in a roll shape is provided. A platen roller 107 is pivotally supported on the front surface of the casing 103, and a thermal head assembly 110 is assembled on the upper side of the platen roller 107.

As shown in FIG. 14B, the thermal head assembly 110 is formed by assembling a thermal head main body 111, a simple cutter 121, and a head support 131 in order from the lower side, and integrally assembling with mounting screws 140S.
The thermal head main body 111 is formed by fixing an aluminum plate 115 for heat dissipation on the upper surface of a thermal head substrate 113 with screws 111S. A connector 117 connected to the head cable set 109 is provided on the rear end side of the upper surface of the thermal head substrate 113.

  The simple cutter 121 is for individually cutting a roll-shaped adhesive label drawn continuously, and includes a cutter blade 123 at the lower end edge. A hole 125 is formed in the simple cutter 121, and the hole 125 is positioned by being inserted into the positioning pin 116 on the upper surface of the aluminum plate 115 of the thermal head main body 111.

  The head support 131 includes an upper plate 132 and a lower plate 133 that are vertically opposed to each other, and an assembly member 135 that is swingably attached thereto. A lever guard 130 is fitted on the front end side of the lower plate 133. Both end portions of the assembly member 135 extend downward, and engagement claws 135a are formed at the lower ends thereof. Both engaging claws 135 a of the assembly member 135 can be engaged with the engaging pins 103 a of the casing 103.

  The thermal head main body 111, the simple cutter 121, and the head support 131 (and the lever guard 130) are fastened with mounting screws 140S and integrated as a thermal head assembly 110. As shown in FIG. 14A, in the thermal head assembly 110, the engagement claw 135 a of the assembly member 135 of the head support 131 is engaged with the engagement pin 103 a of the casing 103 on the front surface of the casing 103. Is assembled. In this assembled state, the roller surface of the platen roller 107 is positioned below the thermal head provided on the thermal head substrate 113. A thermal paper (or plain paper / thermal transfer ribbon) to be printed is sandwiched between the thermal head and the roller surface of the platen roller 107, and an interval suitable for printing while being conveyed (to the platen roller 107 of the thermal head). Of pressing force).

  By the way, when the surface of the thermal head is worn or the dots are missing from the thermal head as the label printer 101 is used for a long period of time, the above-described thermal head substrate 113 is replaced. At this time, the assembly member 135 of the head support 131 of the thermal head assembly 110 is pushed, the engagement claw 135 a is removed from the engagement pin 103 a of the casing 103, and the thermal head assembly 110 is removed from the casing 103. Next, the mounting screw 140S is removed with a tool to disassemble the thermal head assembly 110, and the screw 111S is removed with a tool to disassemble the thermal head substrate 113 and the aluminum plate 115. Then, after replacing with another thermal head substrate, the screw 111S and the mounting screw 140S are fastened again to assemble the thermal head assembly 110 and set it in the casing 103.

  As described above, the label printer 101 shown in FIG. 14 must be removed and tightened with a tool each time the thermal head substrate is replaced, which is troublesome. Furthermore, since the thermal head assembly 110 is fixed integrally with the mounting screw 140S, it is necessary for the operator to properly position the thermal head after replacement. For this reason, there is a demand for a structure in which the thermal head portion can be easily attached to and detached from the apparatus main body when the thermal head substrate is replaced. From such a viewpoint, for example, in Japanese Patent Laid-Open No. 2002-19167 (Patent Document 1), a printer apparatus including a thermal head that is detachable from the apparatus main body is proposed.

The printer device of Patent Document 1 includes a thermal head mounting plate to which a thermal head is fixed, and a thermal head pressing member that detachably holds the thermal head mounting plate. Each side plate of the thermal head mounting plate is provided with a notch and a holding pin. Each notch of the thermal head mounting plate engages with an annular groove of a rotating shaft provided on the thermal head pressing member. On the other hand, each holding pin of the thermal head mounting plate engages with a notch provided on both side plates of the thermal head pressing member. In this structure, the thermal head mounting plate can be removed from the thermal head pressing member by releasing the engagement between each holding pin of the thermal head mounting plate and each notch of the thermal head pressing member.
However, since the structure of the printer device of Patent Document 1 is somewhat complicated, a further simplified device is required. Moreover, in this printer apparatus, since the thermal head mounting plate is relatively large due to the structure for mounting the thermal head, it may be difficult to attach and detach. Furthermore, since the thermal head is not detachable from the thermal head mounting plate, when changing the thermal head to another type, a thermal head mounting plate must be prepared accordingly, and the versatility Is low. Furthermore, it is also necessary for the operator to properly position the thermal head after replacement.

JP 2002-19167 A

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a printer device in which a thermal head portion can be easily attached and detached when a thermal head is replaced, and the structure is relatively simple.

  A printer apparatus according to the present invention is a printer apparatus that performs printing while conveying an object to be printed while being pressed against a thermal head, and includes a thermal head assembly including a main body of the thermal head and a head support plate to which the main body is fixed. A head mounting member to which the thermal head assembly is mounted, a frame main body that rotatably supports the head mounting member, and a biasing mechanism that biases the head mounting member so as to press the thermal head against a printing material. A head frame having the head support plate and the head mounting member, wherein the head mounting member rotates with respect to the frame main body to take both a head attaching / detaching position and a head fixing position. And a positioning engagement portion that can be engaged at the head fixing position. While being Oite positioned, characterized in that it comprises a stopper for fixing the head supporting plate to the head mounting member.

According to this printer apparatus, the head mounting member rotates to take the head attaching / detaching position and the head fixing position. When the head mounting member is in the head attaching / detaching position, the thermal head assembly can be removed from the head frame, so that the thermal head assembly can be easily replaced without requiring a tool. On the other hand, when the head mounting member is at the head fixing position, the thermal head assembly can be fixed at an appropriate position by the positioning engagement portion and the stopper. In this fixed state, the thermal head is pressed against the substrate by the urging force of the urging mechanism. Therefore, by adjusting the urging force of the urging mechanism appropriately in advance, the pressing force associated with the replacement of the thermal head assembly No cruising will occur.
The printer apparatus of the present invention can be applied to either one or both of those using thermal paper as a substrate to be printed, plain paper, and those using a thermal transfer ribbon.

In the printer device of the present invention, it is possible to include a lever that is swingably provided on the head mounting member and that engages and disengages the positioning engagement portion.
In this case, by operating the lever, the positioning engagement portion can be engaged / released with one touch. Therefore, the replacement operation of the thermal head assembly becomes easier.

In the printer device of the present invention, the positioning engagement portion includes an engagement hole formed in the head support plate, and a pin provided in the lever and engageable with the engagement hole. With the operation of the lever, the engagement between the engagement hole and the pin is released at the head detaching position, and the engagement hole and the pin can be engaged at the head fixing position.
In this case, a structure for attaching and detaching the thermal head assembly can be realized with a simple configuration in which the pin is engaged with the engagement hole.

The printer device according to the present invention may further include an elastic member provided between the frame main body and the head mounting member that expands and contracts as the head mounting member rotates.
In this case, the stability of the head mounting member with respect to the frame body is appropriately ensured by the elastic member.

  According to the present invention, it is possible to provide a printer apparatus in which the thermal head portion can be easily attached and detached when replacing the thermal head and the structure is relatively simple.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an external perspective view of a label printer according to the present embodiment.
FIG. 2 is a perspective view showing a state in which the cover of the label printer is opened.
FIG. 3 is a perspective view showing a thermal head assembly of the label printer. (A) is a figure which shows the surface side (thermal head side), (B) is a figure which shows a back surface side (anti-thermal head side).
FIG. 4 is a perspective view showing the entire head frame of the label printer.
FIG. 5 is a view showing the head frame. (A) is a plan view and (B) is a front view.

  As shown in FIGS. 1 and 2, the label printer 1 includes a rectangular parallelepiped casing 3. The upper half of the casing 3 is a cover 5 that can be opened and closed. The cover 5 is opened when a cover open button 6 is pressed. Inside the casing 3, an accommodation space 1A for accommodating an adhesive label wound in a roll shape is provided. A platen roller 7 is pivotally supported on the lower half of the front side of the casing 3. On the other hand, a head frame 30 to which the thermal head assembly 10 is detachably assembled is fixed inside the front surface of the cover 5.

Hereinafter, the configuration of the thermal head assembly 10 and the head frame 30 will be described in detail.
First, the structure of the thermal head assembly 10 will be described mainly with reference to FIG.
As shown in FIG. 3, the thermal head assembly 10 includes a main body substrate 13 on which a thermal head 11 is formed. The main board 13 is provided with a connector 15 connected to a head cable set (not shown) in the casing 3. The main body substrate 13 is fixed to the head support plate 21 via an aluminum plate 19 for heat dissipation. The main board 13 and the aluminum plate 19 are fixed with screws 13S (see FIG. 3A), and the aluminum plate 19 and the head support plate 21 are connected to the long holes 23C with screws 21S (see FIG. 3B). It is fixed so that the front-rear facing direction can be adjusted.

The head support plate 21 includes a head fixing plate portion 23 and side wall portions 25 and 26 formed by bending both sides of the head fixing plate portion 23 vertically.
On one side of the head fixing plate portion 23 (side opposite to the connector 15), a section 23a and two engagement holes 23b on both sides of the section 23a are formed. The section 23a engages with a stopper 35a (see FIGS. 4 and 5) described later. The heads of positioning pins 61 and 62, which will be described later, engage with the respective engagement holes 23b. A semicircular portion of the engagement hole 23b is covered with an aluminum plate 19 (see FIG. 3B).

  Pin engaging notches 25a and 26a and roller shaft locking notches 25b and 26b are formed on both side walls 25 and 26, respectively. The pin engagement notches 25a and 26a engage with guide pins 37a and 38a (see FIGS. 4 and 5) of the head frame 30, which will be described later. The roller shaft locking notches 25b and 26b are respectively locked to both ends 8 of the main shaft of the platen roller 7 shown in FIG. 2 when the cover 5 of the casing 3 is closed as shown in FIG.

Next, the structure of the head frame 30 will be described mainly with reference to FIGS. 4 and 5.
As shown in FIGS. 4 and 5, the head frame 30 includes a head mounting member 31 to which the above-described thermal head assembly 10 is mounted. The head mounting member 31 includes a bottom plate portion 33, a stopper wall portion 35 that rises from four sides of the bottom plate portion 33, a guide wall portion 36, and left and right side wall portions 37 and 38. The stopper wall portion 35 and the guide wall portion 36 have an arch shape, and openings 35 ′ and 36 ′ are formed between the stopper wall portion 35 and the guide wall portion 36.

  At the left and right inner ends of the opening 35 ′ between the stopper wall 35 and the bottom plate portion 33, the bottom plate portion 33 is formed with cuts 35 x, and the inner plate portions 35 y inside these cuts 35 x are bent so as to be raised. Yes. A bracket 35z is fixed to the lower surface side of the inner plate portion 35y. In a space between the inner plate portion 35y and the bracket 35z, a lever 65 (described later) is slidably disposed. On the other hand, the opening 36 ′ between the guide wall portion 36 and the bottom plate portion 33 becomes a space for inserting the above-described head cable set (not shown).

  A claw-shaped stopper 35 a is formed at the upper end of the stopper wall 35. The stopper 35a engages with the section 23a of the head fixing plate portion 23 of the head support plate 21 described above at a fixing position of the head mounting member 31 described in detail later.

  The left and right side wall portions 37 and 38 of the head mounting member 31 are respectively provided with guide pins 37a and 38a projecting inward at positions opposed to the central upper end portion in the width direction. The guide pins 37a and 38a engage with the pin engagement notches 25a and 26a of the side wall portions 25 and 26 of the head support plate 21, respectively. Further, auxiliary roller support portions 37b and 38b for laying the auxiliary roller 9 shown in FIG. 2 are formed on the left and right side wall portions 37 and 38, respectively. The auxiliary roller 9 is for holding the roll-shaped adhesive label accommodated in the accommodating space 1A in the casing 3 and smoothly pulling out the adhesive label.

  Such a head mounting member 31 is rotatably held inside the frame main body 41. The frame main body 41 has a bottom plate portion 43 and side wall portions 45 and 46 formed by bending both sides of the bottom plate portion 43 vertically.

  A plurality of screw holes 43 a for fixing the frame body 41 to the inner surface of the cover 5 of the casing 3 are formed on the periphery of the bottom plate portion 43. As shown in FIG. 5B, the bottom plate portion 43 is formed with a section 44 and circular holes 43b on both sides of the section 44. A push spring 75 for pushing up a later-described lever 65 is locked to the section 44. The lower ends of positioning pins 61 and 62 to be described later are inserted into the respective circular holes 43b. The circular hole 43b serves as a relief hole when the positioning pins 61 and 62 are lowered.

  Locking pins 45a and 46a projecting outward are provided at the upper ends of the side wall portions 45 and 46, respectively. These locking pins 45a and 46a serve to facilitate positioning when the frame body 41 is fixed to the inner surface of the cover 5 of the casing 3, and the semicircular locking grooves 5a ( (See FIG. 2). Further, two long holes 45b and 46b are formed in each of the side wall portions 45 and 46 (four in total). Stopper screws 37S, 38S coupled to the left and right side wall portions 37, 38 of the head mounting member 31 pass through the long holes 45b, 46b. When each stopper screw 37S, 38S hits the upper edge of each of the long holes 45b, 46b, the head mounting member 31 cannot rotate with respect to the frame body 41.

  Leaf springs 51 and 52 are interposed between the head mounting member 31 and the frame main body 41. The plate springs 51 and 52 are biased in the direction in which the head mounting member 31 is lifted with respect to the frame main body 41 (that is, the direction in which the stopper screws 37S and 38S hit the upper end edges of the long holes 45b and 46b). By these leaf springs 51 and 52, the stability of the head mounting member 31 with respect to the frame main body 41 is appropriately ensured. Therefore, the thermal head is stably held even when an external impact is applied to the casing 3 after the thermal head assembly 10 is assembled to the casing 3.

  The head frame 30 is further provided with positioning pins 61 and 62 for removably positioning the thermal head assembly 10 assembled to the head mounting member 31. In the present embodiment, a positioning engagement portion is constituted by the positioning pins 61 and 62 and the engagement hole 23 b of the head fixing plate portion 23 of the head support plate 21.

  The positioning pins 61 and 62 are fixed to the lever 65 through. As shown in FIG. 5B, the lever 65 is bent in a U shape so as to follow the bottom plate portion 33 and the inner plate portion 35y of the head mounting member 31. As described above, the lever 65 of the head mounting member 31 is bent. It is slidably disposed in the space between the inner plate portion 35y and the bracket 35z. The pressing portion 65a of the lever 65 extends in a Z shape toward the outside and is bent. As clearly shown in FIG. 5B, the positioning pins 61 and 62 penetrating and fixed to the lever 65 project at the upper end side through the inner plate portion 35y and project at the lower end side through the bracket 35z. . When the lever 65 is lowered, the lower ends of the positioning pins 61 and 62 are inserted into the circular holes 43 b of the bottom plate portion 43 of the frame body 41.

  Between the upper end head seating surface of the positioning pins 61 and 62 and the upper surface of the inner plate portion 35y of the head mounting member 31, springs 71 and 72 are fitted on the positioning pins 61 and 62, respectively. These springs 71 and 72 urge the head mounting member 31 in the direction of lifting the positioning pins 61 and 62 and the lever 65. Further, as shown in FIG. 5B, a pressing spring 75 is interposed between the section 44 of the frame main body 41 and the lower surface of the lever 65. The push spring 75 biases the lever 65 in the direction of lifting.

  In the present embodiment, a biasing mechanism that biases the head mounting member 31 so as to press the thermal head 11 against the printing material is configured by the springs 71 and 72 fitted around the positioning pins 61 and 62.

Next, a method of attaching / detaching the thermal head assembly 10 to / from the head frame 30 in the label printer 1 having the above-described configuration will be described.
First, a method of removing the thermal head assembly 10 from the head frame 30 will be described mainly with reference to FIGS.
6 to 9 are perspective views for explaining a method of removing the thermal head assembly from the head frame in the present embodiment.
As shown in FIG. 2, the head frame 30 is screwed to the inner surface of the cover 5 of the casing 3. In the state where the cover 5 is opened, the lever 65 is located on the upper side, and the guide wall 36 side is located on the lower side.

  As shown in FIG. 6, in the state where the thermal head assembly 10 is assembled to the head frame 30, the thermal head assembly 10 is disposed inside the head mounting member 31 of the head frame 30. In the thermal head assembly 10, the pin engagement notch 25a (26a) of the head support plate 21 is engaged with the guide pin 37a (38a) of the head mounting member 31, and the engagement hole 23b of the head support plate 21 is positioned. It is held by engaging the heads of the pins 61 and 62 and engaging the section 23 a of the head support plate 21 with the stopper 35 a of the head mounting member 31. At this time, the head mounting member 31 is in a head fixing position where it does not rotate with respect to the frame main body 41.

  In this state, the guide pin 37a (38a) does not hit the inner end of the pin engagement notch 25a (26a), but is engaged at a midway position thereof. The end faces of the heads of the positioning pins 61 and 62 pass through the engagement holes 23 b and contact only the aluminum plate 19, and push the main body substrate 13 overlapping the aluminum plate 19. A force is applied to the main body substrate 13 by the springs 71 and 72 pressing the heads of the positioning pins 61 and 62, and these forces become pressures for pressing the thermal head 11 against the adhesive label.

  Then, in order to remove the thermal head assembly 10 assembled to the head frame 30, the pressing portion 65a of the lever 65 is pushed in the direction of the arrow T as shown in FIG. Then, the positioning pins 61 and 62 fixed to the lever 65 are also retracted in the same direction T, the heads of the positioning pins 61 and 62 are disengaged from the engagement holes 23b of the head support plate 21, and the engagement of both is released. The At this time, the springs 71 and 72 are contracted between the heads of the positioning pins 61 and 62 and the inner plate portion 35 y of the head mounting member 31, and the pressing spring 75 (see FIG. 5B) is connected to the lever 65. It is contracted with the frame body 41.

  Then, the thermal head assembly 10 is slid in the direction of the arrow U in FIG. Then, thereafter, the inner end portion of the pin engagement notch 25a (26a) of the head support plate 21 contacts the guide pin 37a (38a) of the head mounting member 31. At this point, the engagement between the stopper 35a of the head mounting member 31 and the slice 23a of the head support plate 21 is released. Then, as shown in FIG. 8, when the lever 65 is released, the positioning pins 61 and 62 advance in the direction of arrow V by the urging force of the springs 71 and 72, and the pressing spring 75 (see FIG. 5B) is attached. The lever 65 is lifted by the force. At this time, the end faces of the heads of the positioning pins 61 and 62 hit a portion outside the engagement hole 23b of the head support plate 21, and the thermal head assembly 10 is inclined with the guide pin 37a (38a) as a fulcrum.

  At this point, the thermal head assembly 10 is in a state where the pin engagement notches 25a (26a) of the head support plate 21 are simply locked by the guide pins 37a (38a) of the head mounting member 31. Therefore, as shown in FIG. 9, the removal is completed by pulling the thermal head assembly 10 away in the direction of the arrow W.

Next, a method for assembling the thermal head assembly 10 to the head frame 30 will be described with reference to FIGS.
10 to 13 are perspective views for explaining a method of assembling the thermal head assembly in the present embodiment to the head frame.
In order to assemble the thermal head assembly 10 to the head frame 30, first, as shown by an arrow X in FIG. 10, the pin engagement notch 25 a (26 a) of the head support plate 21 of the thermal head assembly 10 is attached to the head mounting member 31. The guide pin 37a (38a) is locked. Then, as shown in FIG. 11, the thermal head assembly 10 is engaged in a state where the guide pin 37a (38a) hits the inner end of the pin engagement notch 25a (26a) (the same state as FIG. 8 described above). Stopped.

  Next, as shown in FIG. 12, the thermal head assembly 10 is pushed in the arrow Y direction. At this time, the portion outside the engagement hole 23b of the head support plate 21 hits the upper end of the head of the positioning pins 61 and 62, and the positioning pins 61 and 62 and the lever 65 are pushed against the biasing force of the springs 71 and 72. Go down. Then, as shown in FIG. 13, when the thermal head assembly 10 is pushed and slid in the arrow Z direction, the engagement holes 23b of the head support plate 21 are engaged with the heads of the positioning pins 61 and 62. Then, the slice 23a is pressed by the stopper 35a. At this time, similarly to the state of FIG. 6 described above, the head mounting member 31 takes a head fixing position where the head mounting member 31 does not rotate with respect to the frame body 41, and the thermal head assembly 10 is assembled to the head frame 30.

  When the thermal head is replaced with another type, it is only necessary to replace the main body substrate 13 with respect to the head support plate 21, so that the head support plate 21 itself is not required to be replaced. Therefore, it is not necessary to prepare a head support plate corresponding to various thermal heads, and the versatility can be improved.

1 is an external perspective view of a label printer according to an embodiment. It is a perspective view which shows the state which opened the cover of the label printer. It is a perspective view which shows the thermal head assembly of the label printer. (A) is a figure which shows the surface side (thermal head side), (B) is a figure which shows a back surface side (anti-thermal head side). It is a perspective view which shows the whole head frame of the label printer. It is a figure which shows the head frame. (A) is a plan view and (B) is a front view. It is a perspective view for demonstrating the method to remove the thermal head assembly in this Embodiment from a head frame. It is the same perspective view. It is the same perspective view. It is the same perspective view. It is a perspective view for demonstrating the method to assemble | attach the thermal head assembly in this Embodiment to a head frame. It is the same perspective view. It is the same perspective view. It is the same perspective view. It is a figure which shows an example of the present label printer. (A) is an overall perspective view, and (B) is an exploded perspective view of a thermal head assembly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Label printer 3 Casing 5 Cover 7 Platen roller 10 Thermal head assembly 11 Thermal head 13 Main body board 15 Connector 19 Aluminum plate 21 Head support plate 23a Section 23b Engagement hole 23c Long hole 25a, 26a Pin engagement notch 30 Head frame 31 Head mounting member 35 Stopper wall 35a Stopper 35y Inner plate 35z Bracket 37a, 38a Guide pin 37S, 38S Stopper screw 41 Frame body 45b, 46b Long hole 51, 52 Leaf spring 61, 62 Positioning pin 65 Lever 71, 72 Spring 75 Push Spring

Claims (4)

A printer device that performs printing while conveying a printing material while being pressed against a thermal head,
A thermal head assembly comprising a main body of the thermal head and a head support plate to which the main body is fixed;
A head mounting member to which the thermal head assembly is mounted; a frame main body that rotatably holds the head mounting member; and a biasing mechanism that biases the head mounting member so as to press the thermal head against a substrate. A head frame having
With
The head mounting member rotates with respect to the frame body, and can take both positions of a head attaching / detaching position and a head fixing position,
The head support plate and the head mounting member are formed with positioning engaging portions that can be engaged at the head fixing position,
And a stopper for fixing the head support plate to the head mounting member in a state of being positioned at the head fixing position.   The printer apparatus according to claim 1, further comprising a lever that is swingably provided on the head mounting member and that engages and disengages the positioning engagement portion. The positioning engagement portion is
An engagement hole formed in the head support plate;
A pin provided on the lever and engageable with the engagement hole;
With
The operation of the lever releases the engagement between the engagement hole and the pin at the head detaching position, and the engagement hole and the pin are engaged at the head fixing position. Item 3. The printer device according to Item 2. 4. The printer apparatus according to claim 3, further comprising an elastic member provided between the frame main body and the head mounting member, which expands and contracts as the head mounting member rotates.

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