JP3774129B2 - Thermal transfer thermal printer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thermal transfer type thermal printer for printing on plain paper using a ribbon.
[0002]
[Prior art]
In this type of thermal printer, in consideration of the case where labels are used for recording paper, the label pitch sensor arranged in the recording paper transport path prints on the back side of the backing paper temporarily attached to the label according to the label pitch. In order to reliably detect the sensor mark, a recording paper presser is provided that presses the recording paper toward the sensor side in a parallel state in which the ink ribbon and the head are in contact with the platen roller across the recording paper. .
[0003]
[Problems to be solved by the invention]
The recording paper presser is made to have a size corresponding to the size (width) of the label pitch sensor, and the recording paper is pressed at a partial position in the width direction corresponding to the position of the sensor. Accordingly, when the ink ribbon is passed between the recording paper and the recording paper presser, the ribbon is also pressed at a partial position in the width direction, and the ink ribbon that is much thinner than the recording paper reaches the printing unit. By this time, it becomes a habit and it becomes impossible to perform clear printing.
[0004]
[Means for Solving the Problems]
Print with the ink ribbon and recording paper sandwiched between the print section of the thermal head and the platen roller, and the platen roller is placed on the fixed part of the main body so that the ink ribbon and the thermal head come in contact with and separate from the platen roller. The thermal transfer type thermal printer that supports the thermal head and the ink ribbon is cantilevered on the fixing part of the main body with one end parallel to the recording paper transport direction at the side of the platen roller. In addition, the ribbon and the head can be in contact with the platen roller with the recording paper sandwiched between them, and can be separated and rotated up to approximately 90 °. It is wound around the ribbon supply paper tube, and its tip is attached to the ribbon winding paper tube through the surface facing the platen roller of the thermal head. One end of each of the ribbon supply paper tube and the ribbon winding paper tube is fitted into a base side supply paper tube shaft and a base side winding paper tube shaft disposed on the ribbon base coupled to the base, and also The other end of each of the supply paper tube and the winding paper tube is fitted to a cover-side supply paper tube shaft and a cover-side winding paper tube shaft arranged on a ribbon cover connecting the open end sides, and further a thermal head The separation pin for separating the ribbon and the recording paper in the parallel running portion of the ink ribbon and the recording paper up to the printing section while being in contact with the platen roller is cantilevered on one end side with respect to the base. while being supported, and printing state forming position for separating the ink ribbon and the recording paper during printing, provided rotatably between an open position for opening the attachment path of the ink ribbon, moreover, the separation pin But the ink ribbon of the transfer path of the recording sheet supports a recording paper presser to press the label pitch sensor side located opposite furthermore ribbon detachable regulating member and a closing action portion and the camming portion Is provided at the other end of the base so as to be rotatable between the first position and the second position, and when the ribbon attachment / detachment restricting member is rotated to the first position, it is opened and closed. The action part makes it impossible to attach / detach the ribbon cover to / from the ribbon supply paper tube and the ribbon take-up paper tube, and when the ribbon attachment / removal restricting member is turned to the second position, Provided is a thermal transfer type thermal printer in which a ribbon cover can be attached / detached and a separating pin is moved to the open position by a cam action portion .
[0005]
[Action]
In the state where the ink ribbon and the thermal head are separated from the platen roller, the ink ribbon can be attached / detached by operating the ribbon attachment / removal regulating member, and the recording paper presser side of the recording paper press supported by the separation pin In other words, the ink ribbon can be exchanged / attached properly.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0007]
FIG. 1 is a perspective view showing the appearance of the thermal printer of the present invention, FIG. 2 is a perspective view showing a state in which the upper lid is opened rearward from FIG. 1 by about 90 °, and FIG. Is a perspective view showing a state in which a head / ribbon structure on which an open type ink ribbon can be mounted is erected approximately 90 ° from FIG. 2 so as to separate the thermal head from the platen roller. 4 is an exploded perspective view of the head / ribbon structure with the dial holding plate and the ribbon attachment / removal restriction dial removed, and FIG. 5 is an exploded perspective view centering on the dial holding plate and the ribbon attachment / removal restriction dial. Fig. 7 is a plan view of Fig. 3 showing a state in which the ribbon attachment / removal restriction dial starts to be turned rightward, and Fig. 7 is a state in which the ribbon attachment / removal restriction dial is completely turned rightward and the ribbon cover is revolved. FIG. 8 is a perspective view of a state in which the ribbon base and the ribbon cover are unfolded from the positioning member continuously provided from the base side, and FIG. 8 is an ink ribbon in which the ribbon cover is removed and the jetty is omitted. FIG. 9 is a side view corresponding to FIG. 2 in an initial state in which the device is mounted, and FIG.
[0008]
In FIG. 1, the thermal printer main body 1 is composed of a fixed portion 100 and an upper lid 200, and the upper lid 200 can be opened and closed with respect to the fixed portion 100 by a hinge on the back surface. "Feed", "on line", and "test" operation keys arranged side by side, and four "paper", "battery", "ribbon", and "machine" errors arranged side by side On the other hand, the light emitting elements for display are arranged, and on the front surface of the fixed portion 100, the portion where several angled projections are seen side by side is the discharge port 102 in cooperation with the jaw portion 202 (see FIG. 2) of the upper lid 200. It is.
[0009]
2 to 9, the rear part of the fixed part 100 is a roll holder (roll accommodating part) 104 for the roll-shaped recording paper 300, and the platen roller 106, the head / ribbon structure 120, and the platen roller 106 are located at the front part. A head opening / closing lever 108 of the thermal head is disposed. In FIG. 2, the thermal head via the ink ribbon is in parallel with the platen roller in contact with the recording paper.
[0010]
The head opening / closing lever 108 is integrally attached to the hook plate 110, and the hook plate 110 is pivotally supported in the lower portion where the fixing portion 100 is not visible, and is restricted at the illustrated position (FIGS. 2 and 3). Left-handed behavior is given, and right-handed operation is performed against that behavior.
[0011]
The head ribbon structure 120 is supported by a shaft 122 with respect to a pair of upright columns 112 (the right side is hidden and cannot be seen) positioned on the side of the platen roller (parallel to the recording paper transport direction) in the fixed unit 100. A head unit and a recording paper ribbon separation unit are disposed below the base 124 pivoted in a cantilevered manner, and a ribbon unit is disposed above the head unit.
[0012]
The base 124 is configured in a form in which two sheet metal members 124A and 124B (see FIG. 5) are integrated, and the left turnability is given by the restoring force of the spring arm 105 extended from the roll holder 104 only for the initial movement. After that, axial friction is applied so that it stops at any angular position up to a standing state of approximately 90 °, and the functional part is a head support plate passed to the left and right of the base 124 as shown in FIG. The head shaft 126 with respect to 140, a pair (left and right direction) bending 128 (one is not visible) as a stopper for the head support plate 140, and a pair (front and rear direction) ridges for positioning the ribbon unit 2, a pin 132 that is locked to the hook plate 110, and a rubber or plastic cover that is provided close to the pin, as shown in FIG. A knob 134 to be subjected to (see FIG. 5).
[0013]
The head unit includes a head support plate 140 that is rotatably arranged on the head shaft 126 of the base 124, and a line-type thermal head 142 attached to the support plate 140, and the base near the back side of the thermal head 142. A plurality of compression springs (not shown) arranged between the support plate 140 and the support plate 140 provide left-handed rotation until both sides of the support plate 140 abut against the bent 128 and are restricted, as shown in FIG. In a state where the pin portion 132 of the base 124 is locked to the hook plate 110, the thermal head 142 sandwiches the recording paper or the ink ribbon and the recording paper so that a gap is formed between both sides of the support plate 140 and the bent 128. Thus, it is elastically contacted with the platen roll 106.
[0014]
The recording paper ribbon separation unit includes a separation shaft 150 passed to the left and right of the base 124, a connection arm 152 fixed to one end of the shaft 150, a push arm 153 fixed to the other end of the shaft 150, and a connection Separation pins 154 and 155 that are cantilevered at the tip end of the arm 152, a recording paper presser 156 that is fitted and fixed to both pins 154 and 155, and a ring-shaped recording paper guide that is loosely fitted to the separation pin 154 The roller group 157 and the second ribbon guide roller group 159 having a ring shape that is loosely fitted to the separation shaft 150 are configured. In addition, the separation pins 154 and 155 and the recording paper presser 156 are located in a parallel running portion of the ink ribbon and the recording paper toward the printing unit in the state of FIG.
[0015]
A reflective label pitch sensor 114 is disposed in the recording paper transport path between the roll holder 104 and the platen roller 106 in the fixing unit 100. When the recording paper presser 156 returns to the state shown in FIG. The recording paper 300 is pressed against the sensor 114 side, and the sensor mark printed in accordance with the label pitch is reliably detected on the back side of the mount when the recording paper is a label.
[0016]
The ribbon unit is configured such that the ink ribbon 400 is sandwiched between the ribbon base 160 and the ribbon cover 169. The ribbon base 160 includes a ridge portion 162 that divides the ribbon supply portion and the ribbon take-up portion, and a pair of protrusions on the base 124. A pair of notches 163 that can hold the strip portion 130 is formed, and a ring-shaped first ribbon guide roller group 165 loosely fitted to the shaft 164 is disposed immediately after exiting the ribbon supply portion, Furthermore, at the position just before entering the ribbon take-up part, it passes through the printing part of the platen roller and the thermal head (opposite surface of the thermal head and the platen roller) and changes its direction, and appears in the ribbon transfer path toward the ribbon take-up part. A ribbon detection plate 166 that can be rotated by a shaft 167 is arranged so that the detection plate 166 can be moved by its own restoring force. Micro switch SW (see FIG. 8 and 9) are arranged to penetrate into Bonn transport path.
[0017]
Further, a base-side ribbon supply paper tube shaft 172 with a flange and a base-side ribbon winding paper tube shaft 173 with a flange are disposed on the base portion 170 of the ribbon base 160, and the supply paper tube shaft 172 receives frictional resistance. (Or a torque limiter is disposed on the supply paper tube shaft 172), while the winding paper tube shaft 173 is connected to a ribbon winding motor disposed inside the jetty portion 162 via a reduction gear on the back side of the flange. Yes.
[0018]
Further, the ribbon cover 169 has a similar cover-side ribbon supply paper tube shaft (becomes 175 but cannot be seen) and a cover-side ribbon winding paper tube shaft (becomes 176 but cannot be seen) on the side facing the base 170. The ribbon cover 169 has a point-symmetric shape and forms a pair of tenons 178. The paper tube shaft is commonly a molded part, and a plurality of elastic bulges are formed around it so that the supply paper tube 402 or the winding paper tube 404 can be elastically held by fitting with the ink ribbon 400. It has become.
[0019]
Referring to FIGS. 5, 6, and 7, a dial holding plate 180 molded on the open side end surface 124 </ b> X of the base 124 (sheet metal member 124 </ b> B) that is cantilevered is provided on each of the head shaft 126 and the separation shaft 150. The other end side (in the same direction as the open end side of the cantilever support) is attached in a form that can be supported.
[0020]
The dial holding plate 180 has a complicated shape, and a step portion 181 that accommodates the base portion of the ribbon attachment / detachment restriction dial 190 and a round hole 182 that exposes the dial 190 are formed between the dial holding plate 180 and the open end surface 124X. The stepped portion 181 also accommodates a pushed lever 153 fixed to the other end of the separation shaft 150. Further, the dial holding plate 180 is provided with a mortise block 183 facing the ribbon unit facing surface 124Y orthogonal to the open end surface 124X of the sheet metal member 124B, and the mortise block 183 of the ribbon cover 169 is connected to the mortise block 183. A tenon guide 184 is formed to accommodate the two from both sides.
[0021]
Furthermore, the dial holding plate 180 is formed with recesses 185 and 186 for receiving the other ends of the separation pins 154 and 155, respectively. On the other hand, the spacers 187 sandwiched between the sheet metal members 124A and 124B are integrally formed with recesses 188 and 189 for receiving the respective ends protruding from the connecting arms 152 of the separation pins 154 and 155. Yes. (See Figures 3 and 5)
[0022]
The ribbon attachment / detachment restriction dial 190 is accommodated between the stepped portion 181 of the dial holding plate 180 and the open side end surface 124X of the sheet metal member 124B, and is rotatably disposed by being exposed from the round hole 182. A cam 192 that can be pushed to push the separating shaft 150 counterclockwise and an open / close arm 194 that opens and closes the open end face of the tenon guide 184 is formed.
[0023]
The unused ink ribbon 400 is wound around the ribbon supply paper tube 402 and the tip is attached to the ribbon winding paper tube 404 through a predetermined path. The procedure is as follows.
[0024]
The state shown in FIG. 2 is obtained when the push buttons on the front side of both sides are released from the state of FIG. In FIG. 2, the unused ink ribbon 400 is set on the supply side and the attachment to the ribbon winding paper tube 404 at the front end is omitted, but the unused ink ribbon 400 is being loaded. Therefore, all the paper tube shafts 172, 173 and 175, 176 are seen naked as when starting to use (175 and 176 are hidden in the drawing), or at the time of replacement, it is opposite to the figure. In addition, the used ink ribbon 400 is wound around the winding paper tube 404, and the ribbon supply paper tube 402 is seen naked.
[0026]
The ribbon attachment / removal restriction dial 190 is in the first position, which is the rotation-left-turn limit position (see FIGS. 2 and 5). The open / close arm 194 blocks the tenon guide 184 so that the tenon 178 does not come off. 169, the cam 192 is pushed and retracted from the lever 153 (fixed to the separation shaft 150: see FIG. 4), and the separation pin 154 attached to the connecting arm 152 fixed to the separation shaft 150 is attached. Each end of 155 is accommodated in recesses 185, 186 and 188, 189. That is, the ink ribbon 400 cannot be removed or attached.
[0027]
FIG. 6 with a part of the upper surface of the dial holding plate 180 removed is an initial state in which the ribbon attachment / removal restriction dial 190 has started to turn right, and the open / close arm 194 exposes the open end surface of the tenon guide 184. First, the start push the lever 153 cams 192 is pushed Umate, through the separation shaft 150, a connecting arm 152 and the recording paper presser 156 supports the separating pin 154, 155 so to be left-handed integrally displaced, separating pin 154, one end of each of 155, have begun exit as de-receiving from the recess 185 and 186, the other end of each of the separation pins 154 and 155 in the inner part are beginning exits the recess 188, 189.
[0028]
FIG. 7 shows a state in which the dial 190 is completely turned to the right, which is the second position . The open / close arm 194 completely exposes the open end face of the tenon guide 184, and the separation pins 154 and 155 The recesses 185 and 186 are completely removed. Therefore, remove the tenon 178, remove the ribbon cover 169 from the ribbon base 170 side (outside fitting of paper tube axis and paper tube somewhere) it can, also, one end side of the separating pin 154, 155, The ink ribbon 400 is completely removed from the recesses 185 and 186, and the mounting path of the ink ribbon 400 is opened.
[0029]
To explain in exchange operation of the ink ribbon 400, first, the cover side ribbon supply paper tube shaft (17 5) from the feed paper tube 402, also cover side ribbon web tube axis (176) from the web tube 404 as pull each When the ribbon cover 169 is removed from the base portion 170 side, the used ink ribbon 400 is wound around the winding paper tube 404 and the end of the ink ribbon 400 is attached to the supply paper tube 402. (The end of the ink ribbon 400 may be removed from the supply paper tube 402.)
[0030]
Next, when the winding paper tube 404 and the supply paper tube 402 around which the used ink ribbon 400 is wound are removed from the base side ribbon winding paper tube shaft 173 and the base side ribbon supply paper tube shaft 172, the ribbon connected between the two paper tubes is obtained. The part is also extracted from the open part between the separation pins 154 and 155 and the recesses 185 and 186, and the supply paper tube 402 can now be provided to the web tube 404 if the end of the ribbon 400 is removed. The base side ribbon winding paper tube shaft 173 is inserted.
[0031]
Therefore, the supply paper tube 402 wound with the unused ink ribbon 400 is fitted to the base side ribbon supply paper tube shaft 172 so that the ribbon is unwound by left rotation, and the leading end of the ribbon is pulled out to draw the first ribbon. Guide roller group 165-Second ribbon guide roller group 159-Separation pins 154 and 155 and recording paper presser 156 on the side opposite to the recording paper ( separate pins 154 and 155 are particularly opened at their respective ends from the recesses 185 and 186) The ribbon is inserted in the width direction of the ribbon )-the lower side of the thermal head 142 (on the side facing the platen roller 106)-the ribbon detection plate 166, and finally it is rotated clockwise. It is attached to the winding paper tube 404 fitted to the base side ribbon winding paper tube shaft 173 so as to be wound.
[0032]
After that, the point-symmetrical ribbon cover 169 is attached in the reverse procedure of removing the ribbon cover 169, and the ribbon attachment / removal restriction dial 190 is finally turned counterclockwise, and the tenon guide 184 is opened by the opening / closing arm 194. The side end face is closed so that the ribbon cover 169 cannot be removed, and the cam 192 is pushed and retracted from the lever 153 so that the separation shaft 150 system can be rotated clockwise.
[0033]
The state is almost the same as that shown in FIG. 3. With the leading end of the recording paper 300 pulled out to just after the platen roller 106, the head / ribbon structure 120 is rotated clockwise by the knob 134, and the elasticity of the spring arm 105 is restored. If the pin 132 is engaged with the hook plate 110 so as to get over the slope of the hook plate 110 to which the left-handedness is imparted and to get over the slope of the hook plate 110, Return to state 2. The recording paper presser 156 starts to come into contact with the drawn recording paper 300 immediately before the right turn, and is relatively pushed by the structure of the label pitch sensor 114, whereby the separation shaft 150 system is rotated to the right. Thus, both ends of the separation pins 154 and 155 are accommodated in the recesses 185 and 186 of the dial holding plate 180 and the recesses 188 and 189 of the spacer 187, respectively. First, the ribbon separation unit (separation shaft 150 system) is rotated clockwise, and both ends of the separation pins 154 and 155 are accommodated in the recesses 185 and 186 of the dial holding plate 180 and the recesses 188 and 189 of the spacer 187, respectively. The right operation of the head / ribbon structure 120 may be performed. Thus, the separation pins 154 and 155 are placed at a printing state forming position where the ink ribbon 400 and the recording paper 300 are separated before the printing unit. Further, the leading end side of the ink ribbon 400 is attached to the web paper tube 404 so as to wrap the ribbon detection plate 166, but this state is omitted.
[0034]
If the upper lid 200 is lowered and closed from the state shown in FIG. 2, the state shown in FIG. 1 is obtained, and the replacement operation of the ink ribbon 400 is completed. Even if the ribbon attachment / removal restriction dial 190 is to be rotated to the right in the state of FIG. 2, the recording paper presser 156 records and hits the structure of the label pitch sensor 114 via 300, so that it moves only slightly.
[0035]
In the initial state after the ink ribbon 400 is replaced, as shown in FIG. 8, since the ink ribbon 400 is still loose (not tensioned), the microswitch SW is an urging force applied to the pin plunger. And the ribbon detection plate 166 is placed in a normal state.
[0036]
Then, in use of the thermal printer, when the power-on is performed, the ribbon take-up motor is driven a very short predetermined time, the speed reduction mechanism not shown (gear) base-side ribbon web tube shaft 17 3 is rotated clockwise through the let be wound up the printing portion by the thermal head 142 and platen roller 106, the ink ribbon 400 between the base-side ribbon web tube shaft 17 3, as shown in FIG. 9, tensing taking slack, as a result, The ribbon detection plate 166 is rotated counterclockwise, and the pin plunger of the micro switch SW is pushed against the urging force to reverse the on / off state of the micro switch SW. Note that the meaning of inversion of the on / off state of the microswitch SW is not the subject of the present invention, and thus the description thereof is omitted.
[0037]
【The invention's effect】
The thermal printer of the present invention enables the ink ribbon to be attached / detached by operating the ribbon attachment / removal restricting member while the ink ribbon and the thermal head are separated from the platen roller, and the recording paper supported by the separation pin. Forming a ribbon loading path on the side opposite to the recording paper presser is linked, so that the ink ribbon can be replaced / installed properly, and the ink ribbon is loaded on the side opposite to the recording paper. It is something that will not become a trap.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an external appearance of a thermal printer of the present invention.
FIG. 2 is a perspective view showing a state in which the upper lid is opened rearward approximately 90 ° from FIG. 1;
FIG. 3 shows a head / ribbon structure in which a thermal head is arranged on the lower surface and an open type ink ribbon can be mounted on the upper surface. It is a perspective view which shows the state made to do.
FIG. 4 is a developed perspective view of the head / ribbon structure with the dial holding plate and the ribbon attachment / removal restriction dial removed.
FIG. 5 is a developed perspective view centering on a dial holding plate and a ribbon attachment / detachment regulating dial.
6 is a plan view of FIG. 3 showing a state in the middle of starting to turn the ribbon attachment / removal restriction dial to the right.
FIG. 7 is a perspective view showing a state in which the ribbon base, the ink ribbon, and the ribbon cover are unfolded by completely rotating the ribbon attachment / removal restriction dial to remove the ribbon cover from the positioning portion continuously provided from the ribbon base side. It is.
FIG. 8 is a side view corresponding to FIG. 2 in an initial state in which the ribbon cover is removed, the jetty is omitted, and an ink ribbon is attached.
FIG. 9 is a side view of the state immediately after power is turned on.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Thermal printer main body 100 ... Fixed part 104 ... Roll holder (roll accommodation part)
105 ... spring arm 106 ... platen roller 108 ... head opening / closing lever 110 ... hook plate 112 ... column 114 ... label pitch sensor 120 ... head / ribbon structure 122 ... axis 124 ... Bases 124A, 124B ... Sheet metal member 124X ... Open-side end face 124Y ... Ribbon unit facing surface 126 ... Head shaft 130 ... Rub 132 ... Pin 134 ... Knob 140 ... head support plate 142 ... thermal head 150 ... separation shaft 152 ... connection arm 153 ... pressed levers 154,155 ... separation pins 157 ... recording paper guide roller group 159: Second ribbon guide roller group 160: Ribbon base 162 ... Jetty 163 ... Notch 165 ... First ribbon guide roller La group 166 ... Ribbon detection plate 167 ... Shaft 169 ... Ribbon cover 170 ... Base 172 ... Base side ribbon supply paper tube shaft 173 ... Base side ribbon winding paper tube shaft 178 ... Tenon 180 ... Dial holding plate 181 ... Step part 182 ... Round hole 183 ... Mortise block 184 ... Tenon guide 185, 186 ... Recess 187 ... Spacers 188, 189 .. Recess 190 ... Ribbon attachment / detachment restriction dial 192 ... Cam 194 ... Opening / closing arm 200 ... Upper lid 300 ... Recording paper 400 ... Ink ribbon 402 ... Ribbon supply paper tube 404 ...・ Ribbon roll paper tube SW ... Micro switch

Claims (1)

Print with the ink ribbon and recording paper sandwiched between the print section of the thermal head and the platen roller, and the platen roller is placed on the fixed part of the main body so that the ink ribbon and the thermal head come in contact with and separate from the platen roller. The thermal transfer type thermal printer that supports the thermal head and the ink ribbon is cantilevered on the fixing part of the main body with one end parallel to the recording paper transport direction at the side of the platen roller. In addition, the ribbon and the head can be in contact with the platen roller with the recording paper sandwiched between them, and can be separated and rotated up to approximately 90 °. It is wound around the ribbon supply paper tube, and its tip is attached to the ribbon winding paper tube through the surface facing the platen roller of the thermal head. One end of each of the ribbon supply paper tube and the ribbon winding paper tube is fitted into a base side supply paper tube shaft and a base side winding paper tube shaft disposed on the ribbon base coupled to the base, and also The other end of each of the supply paper tube and the winding paper tube is fitted to a cover-side supply paper tube shaft and a cover-side winding paper tube shaft arranged on a ribbon cover connecting the open end sides, and further a thermal head The separation pin for separating the ribbon and the recording paper in the parallel running portion of the ink ribbon and the recording paper up to the printing section while being in contact with the platen roller is cantilevered on one end side with respect to the base. while being supported, and printing state forming position for separating the ink ribbon and the recording paper during printing, provided rotatably between an open position for opening the attachment path of the ink ribbon, moreover, the separation pin But the ink ribbon of the transfer path of the recording sheet supports a recording paper presser to press the label pitch sensor side located opposite furthermore ribbon detachable regulating member and a closing action portion and the camming portion Is provided at the other end of the base so as to be rotatable between the first position and the second position, and when the ribbon attachment / detachment restricting member is rotated to the first position, it is opened and closed. The action part makes it impossible to attach / detach the ribbon cover to / from the ribbon supply paper tube and the ribbon take-up paper tube, and when the ribbon attachment / removal restricting member is turned to the second position, with detachable operation of the ribbon cover is possible, thermal printer of the thermal transfer method is characterized in that the so that is moved by the cam acting portion, the separating pin to the open position.

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