[0048] Reference Figure 4 to Figure 6 , The embodiment (100) of the photo printer according to the present invention includes: a substrate (110), a pickup roller (R1) and a platen roller (R2), a head (refer to Picture 9 的'143'), swing bracket (150), pressure component (160).
[0049] In this embodiment, the substrate (110) is formed with a paper supply part (111) for accommodating a plurality of papers in layers, and a lower substrate (115) extending to the front side is combined with the lower part of the substrate (110), In addition, the substrate (110) and the lower substrate (115) are formed separately for ease of manufacture, and they may also be integrally formed.
[0050] The pickup roller (R1) is the lowermost paper among the paper sheets stacked on the bottom surface of the paper supply part (111) of the substrate (110) to be forwarded.
[0051] In addition, a paper pressing member (120) that elastically presses the paper laminated on the paper supply part (111) downward is formed, and the paper pressing member (120) is coupled to the substrate (110). The upper surface of the side wall is formed inclined downward toward the pickup roller, and the paper is pressed downward. When the paper is pressurized in this way, the friction between the paper and the pickup roller (R1) is increased, and when the pickup roller (R1) rotates, the paper at the lowermost part of the paper can be smoothly fed forward.
[0052] The platen roller (R2) is a component that ejects the paper supplied by the pickup roller (R1) forward, and the rotating shaft is coupled to the lower substrate (115).
[0053] A head (140) is formed on the upper part of the platen roller (R2), and the head (140) imparts heat of a predetermined temperature to the paper, expresses a color corresponding to the temperature, and prints images or text. A ceramic plate (not shown) is formed on the upper part of the head (140), and a metal heat insulating plate (141) is formed on the upper part of the ceramic plate (refer to Picture 9 ).
[0054] In addition, a PCB (142) for controlling the heating temperature or heating time of the head (140) is formed. That is, the head (140) and the PCB (142) are attached to the underside of the heat insulation board (141).
[0055] The paper enters between the head (140) and the platen roller (R2). In particular, the head (140) of the present invention is not fixed to the base plate (110) but is rotatably installed. In more detail, The head (140) is coupled to a mounting portion (151) formed on the front side of the swing bracket (150).
[0056] And, when the paper enters between the head (140) and the platen roller (R2), in order to enlarge the gap between the head (140) and the platen roller (R2) A hinge hole (152) is formed on the rear side of the swing bracket (150), which is a coupling part coupled with a rotation shaft (113) formed on the side wall of the base plate (110). This embodiment and figure 2 In contrast to the prior art shown in the figure, the rotating shaft (113) of the swing bracket is formed on the rear side of the rotating shaft of the platen roller (R2). As mentioned above, the rotating shaft (113) of the swing bracket is formed on the back side of the rotating shaft of the platen roller (R2) because the paper is discharged to the head (140) and the platen roller in consideration of the paper ejection direction. (R2) The gap between (R2) moves easily when entering. Therefore, when the paper enters the gap between the head (140) and the platen roller (R2), not only the gap between the entrance side and the side where the paper is discharged also increases, and the softness can be minimized. The platen roller (R2) is compressed. That is, when the paper moves, the head rotates at a larger angle, so that the soft platen roller (R2) can be minimized to be compressed.
[0057] In addition, the head (140) is in close contact with the paper to transfer heat. For this reason, in order to make the head (140) and the paper close, a pressing member is formed to press the head (140) downward. (160). The pressing member (160) is formed with a pressing part (161) that presses the upper part of the head (140) and a rotating shaft (113) that makes the pressing part (161) and the swing bracket (150) A hinge hole (162) that rotates coaxially.
[0058] In addition, the head (140) is pressed downward by the pressurizing member (160), but a certain space is required between the platen roller (R2) and the head (140) to allow paper to enter. . To this end, a locking piece (114) is protrudingly formed on the upper part of the front end of the lower substrate (115), and correspondingly, a locking rib is formed on the mounting portion (151) of the swing bracket (150) of the mounting head (140) (153), so that the locking member (114) is stuck and does not drop.
[0059] Such as Figure 7 and Figure 8 As shown, according to the embodiment of the present invention, the swing bracket (150) and the pressing member (160) can swing and rotate around the rotation shafts (113) formed on both side walls of the substrate (110).
[0060] In addition, an elastic member (S) that elastically pulls the pressing portion (161) formed on the pressing member (160) downward is formed, and one side of the elastic member (S) is connected to the pressing portion ( The other side of the elastic member (S) is connected and fixed to the connecting portion (115a) formed at the front end of the lower substrate (115).
[0061] Thereby, the head (140) and the upper part of the platen roller (R2) are rotatably formed, and are elastically pressed in the direction of the platen roller (R2) by the elastic member (S).
[0062] In addition, a pressing protrusion (164) is formed under the pressing portion (161). Therefore, the pressure part (161) and the heat insulation board (141) are in point contact with the pressure protrusion (164), and in this state, the pressure part (161) pushes the heat insulation board (141) downward Pressurize. For reference, a head (140) is formed at the lower part of the heat shield (141), whereby the head (140) can be elastically moved in the direction of the platen roller (R2) by the pressurizing part (161) Pressurize.
[0063] If the pressing part (161) comes into surface contact with the heat insulation board (141), the pressing part (161) cannot press the head (140) with uniform pressure. For example, when the elastic forces of a pair of springs (S) formed on both sides of the pressing portion (161) are different from each other, the pressing portion (161) is twisted and is pressed downward by the pressing portion (161). The pressure on the entire area of the head (140) is not uniform, but the pressure on one side is greater, and the pressure on the other side is less, so that the head (140) is distorted and the platen roller ( The interval between R2) and the head (140) is not fixed.
[0064] In order to solve the above-mentioned problems, the present invention forms a pressing protrusion (164) so that the pressing portion (161) and the heat insulation board (141) make non-surface contact point contact.
[0065] Reference Picture 9 Describes the structure and operating state of the embodiment of the present invention.
[0066] As mentioned above, compared with the prior art ( image 3 ) The PCB (13) is arranged obliquely differently. As shown in the figure, the invention (a) arranges the PCB (142) and the substrate (110) in parallel. However, a guide plate (116) is formed to prevent the paper (P) from being hooked on the soldering portion (142a) and the component (142b) of the PCB (142). That is, in order to prevent the paper (P) from contacting the PCB (142), a guide plate (116) is interposed between the PCB (142) and the substrate (110).
[0067] In addition, a guide portion (112) inclined in the forward direction is formed at the front end of the substrate (110). Therefore, the paper advancing through the pickup roller (R1) does not advance in a horizontal state, but advances upward along the guide portion (112). For reference, in figure 1 In the prior art shown in the figure, the bottom surface of the substrate (15) coincides with the upper surface of the platen roller (30), so that the paper is supplied horizontally.
[0068] However, in the present invention, a guide portion (112) is formed at the front end of the substrate (110), so that the bottom surface of the substrate (110) is formed lower than the upper surface of the platen roller (R2). A sufficient space is formed between the (142) to prevent the paper from being caught in the components (142b) of the PCB (142).
[0069] As a result, when the leading end of the paper (P) advancing upward along the guide (112) enters the gap between the head (140) and the platen roller (R2), the swing bracket combined with the head (140) (150) rotates along the rotation axis (113) to raise the head (140). Therefore, the space between the platen roller (R2) and the head (140) becomes larger, and the paper enters the gap space. In addition, the more the paper enters inward, the greater the interval between the platen roller (R2) and the head (140), and the compression of the soft platen roller (R2) can be minimized.
[0070] However, the head (140) is elastically pressed downward by the elastic member (S), and therefore, the head (140) elastically presses the paper (P) and adheres to it.
[0071] In addition, the swing bracket (150) rotates to raise the head (140). Therefore, even if the paper (P) enters, it is possible to prevent the platen roller (R2) 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 transferred from the head (140) is locally transferred to the corresponding part of the paper, and the printing quality is improved.
[0072] In particular, the rotating shaft (113) of the swing bracket is formed on the rear side of the shaft of the platen roller (R2), and the head (140) is easily rotated when the paper enters, the paper (P) and the platen roller ( R2) Maximize line contact to improve printing quality.
[0073] Picture 10 It is a double paper feed prevention member (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 where two sheets of paper are entered.
[0074] As described above, among the plurality of paper sheets stacked in the paper supply unit (111), the paper at the bottom is supplied forward by the pickup roller (R1).
[0075] However, there are cases in which two or more sheets of paper are supplied at the same time due to the influence of static electricity when supplying the paper at the bottom. At this time, printing cannot be performed normally, and therefore, a double paper feed preventing member (130) as in (a) is formed. The double paper feed prevention member (130) is formed into a plate shape having a predetermined length and is arranged vertically, and a slit is formed between it and the paper supply part (111) so that only one sheet of paper can pass through (refer to Picture 10 (c) '117').
[0076] With reference to (b), in particular, the double paper feed preventing member (130) is formed in a wedge shape whose planar shape protrudes forward toward the center. That is, in the drawing, the first side wall (131) on the left side and the second side wall (132) on the right side are formed obliquely. This is for when two or more papers are supplied at the same time, the two ends of the upper paper are sequentially hooked on the two side walls (131, 132) of the double paper feeding prevention member (130) and cannot advance.
[0077] With reference to (c) and (d), the lower end of the double paper feed preventing member (130) is formed to be inclined downward from both sides toward the center. That is, the first side (131a) and the second side (132a) of the lower surface are inclined and formed so as to converge in the center. First, as explained with reference to (b), when two or more sheets of paper are supplied, the two ends of the upper paper are first hung on both sides of the double paper feeding prevention member (130), and are connected to the lower end of the paper. The paper separates and advances, and finally, only the lowermost piece of paper can pass under the center of the double paper feeding preventing member (130).
[0078] Reference Figure 11 to Figure 14 According to the embodiment (100) of the present invention, a motor (M) for driving the platen roller (R2) and the pickup roller (R1) is formed. That is, one motor (M) is used to simultaneously drive the platen roller (R2) and the pickup roller (R1).
[0079] That is, this embodiment is formed with a gear set for rotating the platen roller (R2) and the pickup roller (R1) through a motor (M), and in more detail, includes: a transmission gear meshed with the motor (M) (171); The first power transmission unit for rotating the platen roller (R2); the second power transmission unit for rotating the pickup roller (R1).
[0080] The transmission gear (171) meshes with the first power transmission part and the second power transmission part on both sides.
[0081] The first power transmission unit for rotating the platen roller (R2) includes a first gear (172) meshed with the transmission gear (171) and coupled with the rotation shaft of the platen roller (R2).
[0082] The second power transmission unit for rotating the pickup roller (R1) includes: a second gear (173) meshing with the transmission gear (171), and a clutch gear ( 175). A connecting gear (174) and a clutch (176) connecting the second gear (173) and the clutch gear (175).
[0083] Here, the rotation speed of the platen roller (R2) is faster than that of the pickup roller (R1).
[0084] The clutch gear (175) is connected to the transmission gear (171), and a first protrusion (175a) is formed on one side.
[0085] In addition, the clutch (176) penetrates the rotating shaft (178) of the pickup roller (R1) and is fixed to the rotating shaft (178), and a second protrusion (176a) is formed. A stepped rib (178a) is formed on the rotating shaft (178) of the pickup roller (R1), and the inner peripheral surface of the clutch (176) is fixed in conformity with the shape of the stepped rib (178a).
[0086] In addition, more than one intermediate clutch (177) is formed between the clutch gear (175) and the clutch (176).
[0087] A third protrusion (177a) and a fourth protrusion (177b) are formed on both sides of the intermediate clutch (177), and the third protrusion (177a) engages with the first protrusion (175a), and the The fourth protrusion (177b) is engaged with the second protrusion (176a).
[0088] With the above configuration, the rotational force of the motor (M) can rotate the clutch gear (175) through the transmission gear (171).
[0089] Moreover, when the clutch gear (175) rotates, the first protrusion (175a) meshes with the third protrusion (177a), so that the intermediate clutch (177) rotates. By means of the rotation of the intermediate clutch (177), the fourth protrusion (177b) meshes with the second protrusion (176a), causing the clutch (176) to rotate. Finally, since the clutch (176) is fixed to the rotating shaft (178) of the pickup roller, the pickup roller (R1) can be rotated.
[0090] In addition, the platen roller (R2) rotates at a faster speed than the pickup roller (R1). In particular, the paper (P) is fed forward through the pickup roller (R1), and the leading end of the paper is hooked. At the time of the platen roller (R2), the pickup roller (R1) and the platen roller (R2) are linked, so that the pickup roller (R1) and the platen roller (R2) rotate at the same speed.
[0091] That is, at this time, the slow rotational force transmitted by the second power transmission unit cannot make the pickup roller (R1) continue to rotate, and the pickup roller (R1) and the platen roller (R2) rotate in conjunction.
[0092] This process will be described in detail below. When the pickup roller (R1) is linked with the paper and rotates at the same speed as the platen roller (R2), compared to the clutch (176) coupled to the rotation shaft (178) of the pickup roller The intermediate clutch (177) rotates faster. That is, the second protrusion (176a) rotates faster than the fourth protrusion (177b), and therefore, the fourth protrusion (177b) cannot be pushed any more to rotate the second protrusion (176a).
[0093] When this state continues and the clutch (176) rotates one more time than the intermediate clutch (177), on the contrary, the second protrusion (176a) pushes the fourth protrusion (177b) to rotate. In this state, the first protrusion (175a) rotates before the third protrusion (177a), so the clutch gear (175) can no longer rotate the intermediate clutch (177). That is, it is in a state where it is not rotated by the clutch gear (175), but is rotated at a faster speed in conjunction with the platen roller (R2).
[0094] If the length of the paper is short and the interval between the pickup roller (R1) and the platen roller (R2) is short, the intermediate clutch (177) can be removed, and only the clutch gear (175) and the clutch ( 176). Conversely, if the length of the paper is longer, the interval between the pickup roller (R1) and the platen roller (R2) is longer. Therefore, more than two intermediate clutches (177) should be formed.
[0095] That is, corresponding to the length of the paper, the intermediate clutch (177) may not be formed between the clutch gear (175) and the clutch (176), or two or more may be formed, depending on the length of the paper.
[0096] That is, the present invention can make the paper length sufficiently long by forming the intermediate clutch.
[0097] In addition, conventionally, the first power transmission unit generates the rotational force of the motor (M) to rotate the rotation shaft of the platen roller (R2). There is also a case where the rotational force on the opposite side of the rotation shaft of the platen roller (R2) is decelerated to rotate the pickup roller (R1). That is, the first power transmission part that rotates the platen roller (R2) and the second power transmission part that rotates the pickup roller (R1) are formed on different side surfaces of the substrate (110). As mentioned above, when the first power transmission part and the second power transmission part are not formed on the same side surface of the base plate (110) but are formed on different sides, a load is formed on the rotation shaft of the platen roller (R2) itself, This causes the platen roller (R2) to distort. Therefore, the paper cannot travel straight in the positive direction, but travels straight slantingly. However, according to the present invention, the pickup roller (R1) does not receive the rotational force of the platen roller (R2), but directly receives the rotational force of the transmission gear (171), that is, the motor (M) to rotate. Therefore, the platen roller (R2) can be prevented from being distorted, and the paper can advance in the positive direction.
[0098] Thus, because the first power transmission portion and the second power transmission portion are commonly connected with the transmission gear (171), the first power transmission portion and the second power transmission portion can be formed on the same base plate (110). The side makes the structure simple.
