CN107639941B

CN107639941B - Photo printer

Info

Publication number: CN107639941B
Application number: CN201710598703.2A
Authority: CN
Inventors: 尹熙弼
Original assignee: Dith Global
Current assignee: Dith Global
Priority date: 2016-07-21
Filing date: 2017-07-21
Publication date: 2020-01-17
Anticipated expiration: 2037-07-21
Also published as: KR20180010932A; CN107639941A; KR101950181B1; KR101950184B1; KR20180010929A; KR20180010927A; KR20180010931A; KR101950183B1; KR101979619B1; CN107639946A; KR20180010928A; KR101950185B1; KR101950182B1; KR20180010930A; CN107639946B; CN107639942A; CN107639942B

Abstract

The present invention relates to a photo printer for printing an image or a text by applying heat of a predetermined temperature to a paper sheet for thermally inducing colors, the photo printer comprising: a substrate accommodating the paper; a pickup roller protruding from a bottom surface of the base plate to feed the accommodated paper forward; a paper pressing roller for discharging the paper supplied by the paper pickup roller forward; a head portion formed on an upper portion of the platen roller and configured to apply heat to the paper; a swing bracket having a mounting portion formed at a front side thereof to which the head portion is coupled, and a coupling portion formed at a rear side thereof to be rotatably coupled to the base plate so that the head portion swings; and a pressing member for pressing the head portion downward to be in close contact with the paper fed between the head portion and the platen roller.

Description

Photo printer

Technical Field

The present invention relates to a photo printer, and more particularly, to a photo printer in which heat applied from a head is transferred to a part of a paper sheet to improve printing quality, and the entire surface of the head is pressed in a direction of a platen roller with uniform pressure.

Background

Recently, a photo printer product capable of immediately printing a digital smart camera anytime and anywhere has been developed.

There are various types of photo printers, and particularly, there is a photo printer that uses a printing paper in an inkless manner without additional ink or an ink cartridge, thereby saving subsequent costs. Here, the ink-free system refers to a system in which a portion corresponding to an ink cartridge is included in paper and colors are expressed by heat. That is, since the fuel expressing color by sensing heat is laminated on the paper, an image (photograph) or a text is printed by controlling the heat generation temperature or the heat generation time of the head.

Fig. 1 shows a conventional photo printer (1). As shown, it includes: a substrate (15) on which paper (P) is laminated; a pickup roller (40) protruding from the bottom surface of the base plate (15); a platen roller (30) for discharging the paper (P) fed by the pickup roller (40) forward; a head (thermal printing head,12a) formed on the upper portion of the platen roller (30) and applying heat to the paper (P); and a PCB (13) for controlling the heating temperature, heating time, etc. of the head. The head portion (12a) and the PCB (13) are formed at the lower portion of the heat insulating board (12), the heat insulating board (12) is combined with the upper case (10), and the platen roller (30) is combined with the lower case (20).

Referring to fig. 2, the lower case (20) is hinge-coupled to the upper case (10) at the front side of the platen roller (30) by a hinge shaft (11). This is to cause the lower case (20) to perform a swinging motion (20- >20') downward along the hinge shaft (11) when the paper (P) is fed between the platen roller (30) and the head (12 a). The upper case (10) and the lower case (20) are connected to each other at the rear side thereof by a spring (S), and the upper case (10) and the lower case (20) elastically rotate.

The operation of the conventional photo printer will be described with reference to fig. 3. As can be understood from (a), a gap, which is smaller than the thickness of the sheet (P), is formed between the head (12a) and the platen roller (30). A solder part (13a), an element (13b), and the like are built in the PCB (13). The PCB (13) is disposed so as to be directed upward toward the rear side in order to prevent paper from being caught by the soldering portion (13a) and the element (13b) when paper enters. As described above, the PCB (13) is arranged to be more upward toward the rear side, so that the thickness of the photo printer becomes thicker.

When the paper (P) enters the gap between the head (12a) and the platen roller (30) by means of the pickup roller (40) in this state, the paper rotates along the hinge shaft (11) on the front side and the rear side of the lower case (20) descends downward. When the gap is increased by the above operation, the paper (P) enters the gap between the head part (12a) and the platen roller (30), and at this time, the head part (12a) presses the paper (P) with a predetermined pressure by means of the spring (S) and gives heat, and a predetermined color is expressed according to the heat generation temperature or the heat generation time, and an image or the like is printed.

Further, when the head (12a) is in maximum line contact with the paper (P), the printing quality is high. Because the head portion (12a) locally transmits the heat controlled by the PCB (13) to the corresponding portion of the paper (P).

However, in the conventional photo printer, since the hinge shaft (11) is formed in front of the platen roller (30) and the spring (S) is formed in the rear side, when the paper (P) advances forward, the gap between the platen roller (30) and the head (12a) can be increased by rotation, but the rotation is not easy, and particularly, since the hinge shaft (11) is formed in front of the platen roller (30), the gap on the side where the paper enters is increased, but the gap on the side where the paper is discharged is conversely decreased.

Thus, on the side where the sheet is discharged, the distance between the head (12a) and the platen roller (30) is reduced, and the soft platen roller (30) is deformed in a compressed state at the portion that comes into contact with the sheet, so that the sheet (P) and the platen roller (30) come into surface contact without line contact. Due to the above-described action, the heat of the head portion (12a) cannot be locally transferred to the corresponding portion of the paper, and the transfer of the heat to the adjacent portion (surface contact portion, L) of the corresponding portion causes color change, resulting in deterioration of print quality (see fig. 3 (b)).

Further, the friction between the pickup roller and the paper is small, and the paper is often not smoothly supplied.

Further, although the paper feed roller needs to feed 1 sheet forward, there is a problem that more than 2 sheets are fed due to static electricity between sheets.

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a photo printer capable of improving print quality by locally transferring heat given from a head to a sheet.

Technical scheme for solving problems

In order to solve the above-described problems, a photo printer according to the present invention is a photo printer for printing an image or a text by applying heat of a predetermined temperature to a paper sheet on which colors are expressed by thermal induction, the photo printer including: a substrate accommodating the paper; a pickup roller protruding from a bottom surface of the base plate to feed the accommodated paper forward; a paper pressing roller for discharging the paper supplied by the paper pickup roller forward; a head portion formed on an upper portion of the platen roller and configured to apply heat to the paper; a swing bracket having a mounting portion formed at a front side thereof to which the head portion is coupled, and a coupling portion formed at a rear side thereof to be rotatably coupled to the base plate so that the head portion swings; and a pressing member for pressing the head portion downward to be in close contact with the paper fed between the head portion and the platen roller.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, since the head portion is elastically rotated at the upper portion of the platen roller, the gap between the head portion and the platen roller is separated when the paper enters, and the platen roller made of a soft material can be minimized from being compressed.

Thus, the contact area between the paper and the platen roller is prevented from increasing, and the heat given from the head is locally transferred to the corresponding portion of the paper, thereby improving the printing quality.

In particular, since the rotation shaft of the swing frame is formed at the rear side of the rotation shaft of the platen roller, the head portion is easily rotated when the paper is inserted, and the compression of the platen roller is minimized, thereby making the paper and the platen roller in line contact to the maximum extent and improving the printing quality.

Further, since the pressing bracket presses the upper portion of the head (heat insulating plate) in a point-contact manner, the head is pressed with uniform pressure over the entire surface without being distorted, and the gap between the head and the platen roller is maintained at a constant level.

Further, the pickup roller is not rotated by the rotational force of the platen roller, but is directly rotated by the rotational force of the motor, so that the pickup roller can be rotated at an accurate speed ratio with less power loss.

And the power transmission part for rotating the paper twisting wheel and the power transmission part for rotating the paper pressing roller are formed on the same side surface of the substrate, so that the structure is simple, and the volume is reduced.

In addition, since 2 or more clutches are formed in the power transmission portion for rotating the pickup roller, a long sheet can be used.

Also, the front end of the substrate is formed to be inclined in the forward direction, and therefore, even if the PCB is horizontally mounted, paper can be prevented from being caught by components of the PCB and the like.

Further, a guide plate is formed between the PCB and the substrate, so that paper can be prevented from being caught by elements of the PCB.

Then, the paper accommodated in the base plate is pressed downward, so that the paper is smoothly supplied forward by the paper pickup roller.

The pickup roller can feed only 1 sheet forward.

Drawings

FIG. 1 is a cross-sectional view of a conventional photo printer;

fig. 2 shows a hinge coupling structure of an upper case and a lower case of the photo printer illustrated in fig. 1;

FIG. 3 shows a state of use of a conventional photo printer;

fig. 4 to 6 show the constitution of an embodiment according to the present invention;

fig. 7 to 9 show the action of the head rotation in the embodiment according to the present invention;

fig. 10 to 14 show essential parts of the embodiment according to the present invention in detail.

Drawings

100 photo printer (embodiment)

110 base plate

111 paper supply part

112, a guide part

113 a rotating shaft

114 clamping stop piece

115 lower substrate

116 guide plate

120 paper pressing member

130 double feed prevention member

140 head part

150 oscillating support

160 pressing part

Detailed Description

Referring to fig. 4 to 6, an embodiment (100) of the photo printer according to the present invention includes: a base plate (110), a paper roller (R1) and a paper pressing roller (R2), a head (refer to '143' of figure 9), a swing bracket (150) and a pressing component (160).

In the embodiment, the substrate (110) is formed with a paper supply part (111) for stacking and containing a plurality of papers, a lower substrate (115) extending to the front side is combined with the lower part of the substrate (110), and the substrate (110) and the lower substrate (115) are formed separately for manufacturing convenience and can be formed integrally.

The paper feeding roller (R1) is used for feeding the paper positioned at the lowest part of the paper stacked on the bottom surface of the paper feeding part (111) of the base plate (110) forwards.

And a paper pressing member (120) which elastically presses the paper stacked on the paper supply part (111) downwards is formed, wherein the paper pressing member (120) is combined on the upper surface of the side wall of the substrate (110), is formed to incline downwards towards the paper pickup wheel and presses the paper downwards. When the paper is pressed in this way, the friction between the paper and the pickup roller (R1) is increased, and when the pickup roller (R1) rotates, the lowest paper among the paper can be smoothly fed forward.

The platen roller (R2) is a component for discharging the paper fed by the pickup roller (R1) forward, and the rotary shaft is coupled to the lower board (115).

A head (140) is formed on the upper part of the platen roller (R2), and the head (140) applies heat of a predetermined temperature to the paper, and prints an image or a text by expressing a color corresponding to the temperature. A ceramic plate (not shown) is formed on the head (140), and a heat insulating plate (141) made of a metal material is formed on the ceramic plate (see fig. 9).

And, a PCB (142) for controlling a heat generation temperature or a heat generation time of the head (140) is formed. That is, a header 140 and a PCB 142 are attached to the lower surface of the heat shield plate 141.

The paper enters between the head part (140) and the paper pressing roller (R2), particularly, the head part (140) of the invention is not fixed on the base plate (110) but rotatably installed, in more detail, the head part (140) is combined with an installation part (151) formed at the front side of the swing bracket (150).

When the paper enters between the head (140) and the platen roller (R2), a hinge hole (152) which is a coupling part to a rotary shaft (113) formed on a side wall of the base plate (110) is formed on the rear side of the swing bracket (150) in order to expand the distance between the head (140) and the platen roller (R2). In this embodiment, in contrast to the conventional technique shown in fig. 2, the rotation shaft (113) of the swing bracket is formed on the rear side of the rotation shaft of the platen roller (R2). As described above, the reason why the rotation shaft (113) of the swing bracket is formed on the rear side of the rotation shaft of the platen roller (R2) is because the sheet is easily moved when entering into the gap between the head (140) and the platen roller (R2) in consideration of the discharge direction of the sheet. Therefore, when the paper enters into the space between the head (140) and the paper pressing roller (R2), the space on the entering side is increased, the space on the side where the paper is discharged is also increased, and the compression of the soft paper pressing roller (R2) can be minimized. That is, since the head rotates at a larger angle when the paper moves, it is possible to minimize the compression of the soft platen roller (R2).

The head (140) is in close contact with the paper and transfers heat, and a pressing member (160) for pressing the head (140) downward is formed to bring the head (140) into close contact with the paper. The pressing member (160) is provided with a pressing portion (161) for pressing the upper portion of the head portion (140) and a hinge hole (162) which is a coupling portion for rotating the pressing portion (161) coaxially with the rotary shaft (113) of the swing bracket (150).

The head (140) is pressed downward by the pressing member (160), but a certain distance is required between the platen roller (R2) and the head (140) to allow paper to enter. Therefore, a clamping piece (114) is formed on the upper part of the front end of the lower substrate (115) in a protruding way, and correspondingly, a clamping rib (153) is formed on a mounting part (151) of a swing bracket (150) of a mounting head (140) so that the clamping piece (114) is clamped and does not fall any more.

As shown in fig. 7 and 8, according to the embodiment of the present invention, the swing frame (150) and the pressing member (160) can swing and rotate around the rotation shaft (113) formed on both side walls of the substrate (110).

An elastic member (S) is formed to elastically pull a pressing portion (161) formed on the pressing member (160) downward, one side of the elastic member (S) is connected to a coupling portion (163) formed on the pressing portion (161), and the other side of the elastic member (S) is connected and fixed to a connecting portion (115a) formed at the front end of the lower substrate (115).

Thus, the head (140) is rotatably formed on the upper part of the platen roller (R2), and is elastically pressed in the direction of the platen roller (R2) by the elastic member (S).

A pressing protrusion (164) is formed on the lower surface of the pressing portion (161). Therefore, the pressing part (161) and the heat insulation plate (141) are in point contact through the pressing protrusion (164), and in this state, the pressing part (161) presses the heat insulation plate (141) downward. For reference, a head part (140) is formed at the lower part of the heat insulation plate (141), so that the head part (140) can be elastically pressed towards the paper pressing roller (R2) by a pressing part (161).

If the pressing part (161) makes surface contact with the heat insulating plate (141), the pressing part (161) cannot press the head part (140) with uniform pressure. For example, when the elastic forces of a pair of springs (S) formed on both sides of a pressing section (161) are different from each other, the pressing section (161) is twisted, and the pressure of the entire area of the head section (140) pressed downward by the pressing section (161) is not uniform, but the pressure on one side is large and the pressure on the other side is small, so that the head section (140) is distorted, and the interval between the platen roller (R2) and the head section (140) is not fixed.

In order to solve the above problem, the present invention is provided with a pressing protrusion (164) for bringing the pressing portion (161) into point contact with the heat insulating plate (141) without surface contact.

The configuration and operation of the embodiment of the present invention will be described with reference to fig. 9.

As described above, unlike the conventional technique (fig. 3) in which the PCB (13) is disposed obliquely, the present invention (a) arranges the PCB (142) parallel to the substrate (110) as shown in the figure. However, a guide plate (116) is formed to prevent the paper (P) from being caught by the soldering portion (142a) and the element (142b) of the PCB (142). Specifically, a guide plate (116) is interposed between the PCB (142) and the substrate (110) in order to prevent the paper (P) from contacting the PCB (142).

A guide part (112) inclined upward in the forward direction is formed at the front end of the substrate (110). Thus, the sheet advanced by the pickup roller (R1) does not advance in a horizontal state, but advances upward along the guide portion (112). For reference, in the conventional technique illustrated in fig. 1, the bottom surface of the substrate (15) is aligned with the upper surface of the platen roller (30) so that the paper is horizontally fed.

However, in the present invention, the guide part (112) is formed at the front end of the substrate (110), and the bottom surface of the substrate (110) is formed lower than the upper surface of the platen roller (R2), so that a sufficient space is formed between the paper and the PCB (142), and the paper can be prevented from being locked to the element (142b) of the PCB (142).

Thus, when the leading end of the paper P advancing upward along the guide part 112 enters the space between the head part 140 and the platen roller R2, the swing bracket 150 coupled to the head part 140 rotates along the rotation shaft 113 to lift the head part 140. Thus, a space between the platen roller (R2) and the head (140) is increased, and the paper enters the gap space. Further, the more the paper enters inward, the larger the distance between the platen roller (R2) and the head (140) is, and the compression of the soft platen roller (R2) can be minimized.

However, the head (140) is elastically pressed downward by the elastic member (S), and therefore the head (140) elastically presses the paper (P) and comes into close contact therewith.

Further, since the swing bracket (150) rotates to raise the head (140), even if the paper (P) enters, the platen roller (R2) is prevented from being excessively pressed and deformed. Therefore, the head (140) can be in a non-surface contact line contact state with the paper, so that the heat transmitted from the head (140) is locally transmitted to the corresponding part of the paper, and the printing quality is improved.

In particular, a rotation shaft (113) of the swing frame is formed at the rear side of the shaft of the platen roller (R2), so that the head (140) can be easily rotated when the paper enters, and the paper (P) and the platen roller (R2) can be in line contact to the maximum extent, thereby improving the printing quality.

Fig. 10 is a double paper feed prevention part (130) according to an embodiment of the present invention. Specifically, (a) is a perspective view, (b) is a plan view, (c) is a front view, and (d) is an enlarged front view of a state in which 2 sheets of paper are fed.

As described above, among the plurality of sheets stacked in the sheet supply section (111), the sheet positioned at the lowermost portion is supplied forward by the pickup roller (R1).

However, when feeding the sheet positioned at the lowermost portion, there may be a case where 2 or more sheets are fed at the same time due to the influence of static electricity or the like. At this time, since normal printing is not possible, the double feed prevention member (130) as shown in (a) is formed. The double feed prevention member (130) is formed in a plate shape having a predetermined length and disposed vertically, and a slit (see '117' of fig. 10 (c)) is formed between the double feed prevention member and the sheet supply unit (111) so that only 1 sheet passes through the slit.

Referring to (b), in particular, the double feed prevention member (130) is formed in a wedge shape in which the planar shape protrudes forward as it goes toward the center. That is, in the drawing, the 1 st side wall 131 on the left side and the 2 nd side wall 132 on the right side are formed obliquely. This is to prevent both ends of the upper sheet from being sequentially caught by both side walls (131,132) of the double feed preventing member (130) and from moving forward when simultaneously feeding 2 or more sheets.

Referring to (c) and (d), the lower end of the double feed prevention member (130) is formed to be inclined downward from both sides toward the center. That is, the following 1 st side (131a) and 2 nd side (132a) are formed so as to be inclined so as to converge at the center. First, as described with reference to (b), when 2 or more sheets are fed, both ends of the sheet positioned at the upper portion are first hooked to both side end portions of the double feed prevention member (130) and separated from the lowermost sheet to advance, and finally, only one sheet positioned at the lowermost portion can pass under the center of the double feed prevention member (130).

Referring to fig. 11 to 14, the motor (M) for driving the platen roller (R2) and the pickup roller (R1) is formed according to the embodiment (100) of the present invention. That is, the platen roller (R2) and the pickup roller (R1) are simultaneously driven by one motor (M).

That is, the present embodiment is formed with a gear train for rotating the platen roller (R2) and the pickup roller (R1) by one motor (M), and in more detail, includes: a transmission gear (171) engaged with the motor (M); a 1 st power transmission part for rotating the paper pressing roller (R2); a 2 nd power transmission part for rotating the paper roller (R1).

The transmission gear (171) is engaged with the 1 st power transmission part and the 2 nd power transmission part at both sides, respectively.

The 1 st power transmission part for rotating the platen roller (R2) includes a 1 st gear (172) engaged with the transmission gear (171) and coupled with the rotation shaft of the platen roller (R2).

A 2 nd power transmission portion for rotating the pickup roller (R1), comprising: a 2 nd gear 173 engaged with the transmission gear 171, a clutch gear 175 for passing a rotation shaft of the pickup roller R1, a connecting gear 174 for connecting the 2 nd gear 173 and the clutch gear 175, and a clutch 176.

Here, the rotation speed of the platen roller (R2) is faster than that of the pickup roller (R1).

The clutch gear (175) is coupled to the transmission gear (171) and has a 1 st projection (175a) formed at one side thereof.

The clutch (176) is fixed to the rotating shaft (178) by penetrating the rotating shaft (178) of the pickup roller (R1), and a 2 nd projection (176a) is formed. A stepped edge (178a) is formed on a rotating shaft (178) of the pickup roller (R1), and the inner peripheral surface of the clutch (176) is fixed so as to conform to the shape of the stepped edge (178 a).

One or more intermediate clutches (177) are formed between the clutch gear (175) and the clutch (176).

A3 rd protrusion (177a) and a 4 th protrusion (177b) are respectively formed on two sides of the middle clutch (177), the 3 rd protrusion (177a) is engaged with the 1 st protrusion (175a), and the 4 th protrusion (177b) is engaged with the 2 nd protrusion (176 a).

With the above configuration, the rotational force of the motor (M) can rotate the clutch gear (175) via the transmission gear (171).

And, when the clutch gear (175) rotates, the 1 st projection (175a) is engaged with the 3 rd projection (177a) so that the intermediate clutch (177) rotates, and by virtue of the rotation of the intermediate clutch (177), the 4 th projection (177b) is engaged with the 2 nd projection (176a) so that the clutch (176) rotates. Finally, the clutch (176) is fixed on the rotating shaft (178) of the paper rolling wheel, so that the paper rolling wheel (R1) can rotate.

The paper pressing roller (R2) rotates at a speed faster than that of the paper pressing wheel (R1), and particularly, when the paper (P) is fed forward by the paper pressing wheel (R1) and the front end of the paper is hung on the paper pressing roller (R2), the paper pressing wheel (R1) and the paper pressing roller (R2) are linked, so that the paper pressing wheel (R1) and the paper pressing roller (R2) rotate at the same speed.

That is, at this time, the pickup wheel (R1) cannot be rotated continuously by the slow rotational force transmitted by the 2 nd power transmission unit, and the pickup wheel (R1) is linked with the rotation of the platen roller (R2).

To explain this process in detail, when the pickup roller (R1) rotates at the same speed as the platen roller (R2) in conjunction with the paper, the clutch (176) coupled to the rotation shaft (178) of the pickup roller rotates faster than the intermediate clutch (177). That is, the 2 nd protrusion (176a) rotates faster than the 4 th protrusion (177b), and thus, the 4 th protrusion (177b) cannot be pushed any more so that the 2 nd protrusion (176a) rotates.

When this state continues so that the clutch (176) rotates more than the intermediate clutch (177) once, the 2 nd projection (176a) pushes the 4 th projection (177b) to rotate, conversely. In this state, the 1 st projection (175a) rotates earlier than the 3 rd projection (177a), and therefore the clutch gear (175) cannot rotate the intermediate clutch (177) any more. That is, the paper is not rotated by the clutch gear (175), but is rotated at a higher speed in conjunction with the platen roller (R2).

If the length of the paper is short and the linkage section of the paper roller (R1) and the paper pressing roller (R2) is short, the intermediate clutch (177) can be removed and only the clutch gear (175) and the clutch (176) are formed. On the contrary, if the length of the paper is long, the section where the pickup roller (R1) and the platen roller (R2) are linked is longer, and therefore, more than two intermediate clutches (177) are formed.

That is, the intermediate clutch (177) may not be formed between the clutch gear (175) and the clutch (176) or 2 or more intermediate clutches may be formed according to the length of the sheet.

That is, the present invention can make the paper length sufficiently long by forming the intermediate clutch.

In the past, the rotational shaft of the platen roller (R2) was rotated by the rotational force of the 1 st power transmission unit generator motor (M). In some cases, the rotational force of the platen roller (R2) on the opposite side of the rotational axis is decelerated to rotate the pickup roller (R1). That is, a 1 st power transmission part for rotating the platen roller (R2) and a 2 nd power transmission part for rotating the pickup roller (R1) are formed on different side surfaces of the base plate (110). As described above, when the 1 st power transmission part and the 2 nd power transmission part are not formed on the same side surface of the substrate (110) but formed on different surfaces, a load is generated on the rotation shaft of the platen roller (R2) itself, and the platen roller (R2) is distorted. Therefore, the sheet cannot travel straight in the forward direction but travels straight askew. However, according to the present invention, the pickup roller (R1) is not received the rotational force of the platen roller (R2), but is directly received the rotational force of the transmission gear (171), i.e., the motor (M), to be rotated. Thus, the paper can be moved forward in the forward direction without the paper pressing roller (R2) being distorted.

Thus, since the 1 st power transmission part and the 2 nd power transmission part are commonly connected with the transmission gear (171), the 1 st power transmission part and the 2 nd power transmission part can be formed on the same side of the substrate (110) to make the structure simple.

Claims

1. A photo printer for printing an image or a text by applying heat of a predetermined temperature to a paper sheet having a thermal-sensitive color expressed thereon, comprising:

a substrate accommodating the paper;

a pickup roller protruding from a bottom surface of the base plate to feed the accommodated paper forward;

a paper pressing roller for discharging the paper supplied by the paper pickup roller forward;

a head portion formed on an upper portion of the platen roller and configured to apply heat to the paper;

a swing bracket having a mounting portion formed at a front side thereof to which the head portion is coupled, and a coupling portion formed at a rear side thereof to be rotatably coupled to the base plate so that the head portion swings; and

a pressing member for pressing the head portion downward to be in close contact with the paper inserted between the head portion and the paper pressing roller;

wherein the pressing member has a coupling portion rotatably coupled with the base plate.

2. The photo printer of claim 1,

the pressing member includes:

a pressing bracket having an upper pressing part formed at a front side thereof and located at the head part, and a coupling part of the pressing member formed at a rear side thereof so as to be rotatably coupled to the base plate;

and an elastic member for pulling the pressing portion downward.

3. The photo printer of claim 2,

and a pressurizing bulge is formed below the pressurizing part.

4. The photo printer of claim 1,

a locking member is formed to prevent the head from descending to a predetermined position or less so that a predetermined space is formed between the head and the platen roller.

5. The photo printer of claim 1,

the method comprises the following steps: and a PCB configured in parallel with the substrate and having a guide part formed at a front end thereof and inclined upward to a front side, the PCB controlling a heating temperature or a heating time of the head part.

6. The photo printer of claim 5,

and the guide plate is formed between the PCB and the substrate and prevents the paper from contacting the PCB.