JPH09141954A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease change in density of photographic printing or color shift in the part of a recording medium by reducing fluctuation of conveyance load generated when the recording medium is rushed or left into/from between a capstan and a pinch roller and decreasing uneven feed in the case of performing photographic printing on the whole surface of the thick recording medium such as cards. SOLUTION: An interlocking means 101 for synchronously displacing both a thermal head supporting means and a pinch roller supporting means is provided so that the pinch roller supporting means 102 is in an opening position in a state in which the thermal head supporting means 100 is in an abutting position and also the pinch roller supporting means 102 is in a press-contacting position in a state in which the thermal head supporting means 100 is in a retreating position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal transfer type printer device for printing an image on a recording medium using a thermal head and an ink sheet.

[0002]

2. Description of the Related Art FIGS.
FIG. 19 is a diagram showing a conventional printer device disclosed in Japanese Patent Publication No. JP-A-2003-320, FIG. 19 is a configuration diagram of the conventional printer device, FIG. 20 is a perspective view of a cam used in the conventional printer device, and FIGS.
FIG. 6 is a diagram showing the shape of a cam used in a conventional printer device.

In FIG. 19, 1 is a recording medium, 2 is a thermal head that generates heat for thermal transfer printing, 3 is a thermal head support link mechanism that supports the thermal head 2 so that it can move up and down, and 3a is a frame (see FIG. The first link 3b fixed to the second link 3c has one end rotatably supported by the first link 3a, and the upper end rotatably attached to the second link 3c. The third link 3d is a regulating pin 3e provided at a position abutting the second link 3b at a position where the free end of the second link 3b is displaced downward, and 3e is a free end of the second link. The thermal head biasing spring 3f attached to the third link 3c is a fourth link rotatably connected to the lower end of the third link 3c, and the upper end of the third link 3g is connected to the third link 3c of the fourth link 3f. Opposite side of knot A fifth link 3h rotatably connected to an end portion is a first cam follower 3i provided at a connection node between the fourth link 3f and the fifth link 3g, and an upper end of the third cam follower 3i is the second link. A sixth link 3j rotatably connected to a connection node between the 3b and the fourth link 3f is fixed to the upper surface of the thermal head 2 and has one end rotatably connected to the lower end of the fifth link 3g. The thermal head support link is rotatably supported by the sixth link 3i at the central portion.

Reference numeral 4 is a platen provided to face the thermal head 2, 5 is a capstan axially supported in parallel with the platen 3, 6 is a capstan drive motor for rotating the capstan 5, and 7 is a recording medium 1. A pinch roller that opposes the capstan 5 via the transport path of 8 and a pinch roller support 8 that is displaceably supported between a position where the pinch roller 7 is pressed against the capstan 5 and a position where the pressure contact with the capstan is released. The link, 8a is rotatably supported at the center by a frame (not shown), and the pinch roller 7 is provided at the lower end.
A pinch roller arm that rotatably supports a pinch roller link 8b that is rotatably supported by a frame (not shown) and has one end engaged with the pinch roller arm 8a. 8c has a frame (not shown) at one end. It is a pinch roller urging spring that is fixed and has the other end attached to the pinch roller link 8b.

Reference numeral 9 denotes an ink sheet in which ink is applied to the film surface, 10 denotes a supply-side reel in which an unused portion of the ink sheet 9 is wound in a roll shape, and 11 is a used portion of the ink sheet 9 wound in a roll shape. A take-up reel, 12 is a supply cassette that stores a plurality of recording media 1, 13 is a supply belt that conveys the recording media 1 from the supply cassette 12 toward the thermal head 2, and 14 is a supply unit that faces the supply belt. The pinch rollers 15 are displaceable between the supply side pinch roller 14 and the position where the recording medium 1 in the supply cassette 12 is pressed against the supply belt 13 and the position where the pressure contact with the supply belt 13 is released. , 15a are rotatably supported by a frame (not shown), and rotatably support the supply-side pinch roller 14 at the upper end, and contact the recording medium 1 in the supply cassette 12. That the supply side pinch roller arm having a arm, 15b is a frame displaceable in (not shown) horizontally supported on the supply side pinch roller arm 15a one end
A relay link rotatably connected to the relay link 15c, and an oscillating link 15c having an upper end rotatably supported by a frame (not shown) and a lower end rotatably connected to the relay link 15b.
Is a second cam follower provided at the center of the swing link 15c.

Reference numeral 16 is a cam that engages with the first cam follower 3h, the pinch roller link 8b and the second cam follower 15d, 17 is a rotary shaft to which the cam 15 is attached, and 18 is a rotary shaft for rotating the cam 16 via the rotary shaft 17. It is a cam drive motor.

In FIG. 20, reference numeral 19 denotes a first cam groove which engages with a first cam follower 3h provided on the cam 16, and 20
Is a second cam groove engaged with the second cam follower 15d, and 21 is a cam outer peripheral surface contacting the pinch roller link 8b.

FIG. 21 is a view showing the shape of the second cam groove 20 provided in the cam 16. In FIG. 21, FIG.
9, that is, the thermal head support link mechanism 3 is displaced downward and the thermal head 2 is moved to the platen 4 described above.
And the pinch roller support link 8 is positioned to press the pinch roller 7 against the capstan 5, and the supply unit support link 15 transfers the recording medium 1 in the supply side pinch roller 14 and the supply cassette 12 to the supply belt 13. The position of the first cam follower 3h in the state where it is pressed (hereinafter referred to as the first mode) is defined as A, and the positions rotated clockwise by 90 ° thereafter are defined as B, C, and D.

FIG. 22 is a view showing the shape of the first cam groove 20 provided on the cam 16. Also in FIG.
Similarly, the positions A, B, C, and D are shown, and the positional relationship is clearly shown. FIG. 23 shows the shape of the cam outer peripheral surface 21 provided on the cam 16. Also in FIG. 23, as in FIG. 21, position A,
B, C, and D are shown, and the positional relationship is clarified. However, FIG.
3 shows a surface whose orientation is different from those in FIGS. 21 and 22,
The positions A, B, C and D are mirror-inverted.

Next, the operation of the thermal head support link mechanism 3, the pinch roller support link 8, and the supply section support link 15 in accordance with the rotation of the cam 16 will be described. First, the operation of the thermal head support link mechanism 3 will be described. In FIG. 21, when the cam 16 rotates clockwise, the first cam follower 3h moves from positions A to B, then C,
Then, at D, it contacts the first cam groove 19. Here, the first
The state in which the cam follower 3h is in the position B is referred to as mode 2, the state in the position C is referred to as mode 3, and the state in the position D is referred to as mode 4. Thermal head support link mechanism 3
In the mode 1, the first cam follower 3h turns the rotary shaft 1
7, the thermal head 2 is pressed against the platen 4. On the other hand, in modes 2 to 4, the first cam follower 3h moves away from the rotary shaft 17 and the thermal head 2
Is dissociated from the platen 4.

The operation of the supply portion support link 15 will be described with reference to FIGS. 20 and 22. Supply section support link 1
In Mode 3, the second cam follower 15d is brought closer to the rotating shaft in the mode 3 and the feeding side pinch roller 14 and the recording medium 1 in the feeding cassette 12 are brought into pressure contact with the feeding belt 13 to enable the feeding operation. To do. On the other hand, in modes 1, 2, and 4, the second cam follower 15d
Does not enter the paper feeding operation because is away from the rotation axis.

The operation of the pinch roller support link 8 will be described with reference to FIGS. 20 and 23. In mode 1 and mode 2, the pinch roller link 8b is the cam outer peripheral surface 2
1, the pinch roller support link 8 presses the pinch roller 7 against the capstan 5. On the other hand, in modes 3 and 4, the pinch roller link 8b contacts the cam outer peripheral surface 21 and releases the pressure contact of the pinch roller 7 to the capstan 5.

FIG. 24 is a diagram showing the positions of the thermal head support link mechanism 3, the pinch roller support link 8 and the supply part support link 15 in mode 2, and FIG. 25 is the mode 3 thermal head support link mechanism 3 and pinch roller support in mode 3. FIG. 26 is a diagram showing the positions of the link 8 and the supply unit support link 15, and FIG. 26 is a diagram showing the positions of the thermal head support link mechanism 3, the pinch roller support link 8, and the supply unit support link 15 in mode 4.

Next, the operation of the conventional printer device will be described. In the conventional printer device, the state of mode 4 is maintained before the start of printing. In mode 4,
The thermal head 2 and the platen 4, the pinch roller 7 and the capstan 5, and the supply side pinch roller 14 and the supply belt 13 are all disengaged, and the recording medium 1 is not regulated at all and is not conveyed.

The first stage of the printing operation is the recording medium 1
Is supplied. The cam drive motor 18 is driven to rotate the cam 16 counterclockwise by 90 °, and the mode 4 shifts to the mode 3. As a result, the supply side pinch roller 14 and the recording medium 1 in the supply cassette 12 are brought into pressure contact with the supply belt 13, and the recording medium 1 is conveyed by the supply belt 13 and the supply side pinch roller 14, and the leading end thereof is separated from the pinch roller 7 and the capping roller 7. It goes beyond the position of the stun 5 to the vicinity of the thermal head 2 and the platen 4.

Then, the cam drive motor 18 is driven again to rotate the cam 16 counterclockwise by 90 °, and the mode 3 is switched to the mode 2. As a result, the recording medium 1 in the supply side pinch roller 14 and the supply cassette 12 is fed to the supply belt 1
3 and the pinch roller 7 separates from the recording medium 1
It is pressed against the capstan 5 while sandwiching it. When the capstan drive motor 6 is driven and the capstan 5 is rotated, the recording medium 1 pressed against the capstan 5 by the pinch roller 7 can be conveyed. Here, the end of the recording medium 1 is conveyed to the vicinity of the capstan 5, and the recording medium 1 is moved to a position on the far side beyond the position of the platen 4 (hereinafter, referred to as a printing start position).

After the recording medium 1 is conveyed to the printing start position, the drive motor 18 is driven again to rotate the cam 16 counterclockwise by 90 °, and the mode 2 shifts to the mode 1. In mode 1, the thermal head support link mechanism 3 is displaced downward, and the thermal head 2 is pressed against the platen 4 with the recording medium 1 and the ink sheet 9 interposed therebetween. In mode 1, the capstan drive motor 6 is driven to rotate the capstan 5 to apply a conveying force for the recording medium 1 from the thermal head 2 to the capstan 5 and to wind the ink sheet 9 on the take-up reel 11. Then, the recording medium 1 and the ink sheet 9 are conveyed from the thermal head 2 to the capstan 5 while rotating the platen 4 and sliding on the thermal head 2.

In mode 1, when the recording medium 1 and the ink sheet 9 are conveyed while sliding on the thermal head 2 and at the same time the thermal head 2 is energized to generate heat, the ink applied to the ink sheet 9 is recorded. Is transcribed to.

In a normal color printer, three color inks of yellow, magenta and cyan, or four color inks of yellow, magenta, cyan and black are sequentially superimposed and printed to obtain a color image. Therefore, after printing the first color in mode 1, the process returns to mode 2, the recording medium 1 is conveyed again to the printing start position, and the operation of printing the next color in mode 1 is repeated three or four times. Prints a color image.

[0020]

The conventional printer apparatus is constructed as described above, and the recording medium 1 is conveyed by pressing it against the rotating capstan 5 by the pinch roller 7 during printing. Therefore, the recording medium 1 must always pass between the capstan 5 and the pinch roller 7, and printing cannot be performed on a portion of the recording medium 1 between the capstan 5 and the thermal head 2 at the printing start position. was there. Further, when the recording medium 1 becomes small like a card (for example, a credit card conforming to JIS X6301), there is a problem that the ratio of the unprintable area to the printable area increases.

If the platen 4 is driven by a motor, the recording medium 1 can be conveyed even if the recording medium 1 does not pass between the capstan 5 and the pinch roller 7, so that the printing area is enlarged. be able to. However, since the pinch roller 7 is in pressure contact with the capstan 5 during printing, in a thick recording medium 1 such as a card, the recording medium 1 enters or leaves between the capstan 5 and the pinch roller 7. Since the carrying load changes abruptly at times, unevenness in the feeding of the recording medium 1 occurs. Therefore, there is a problem in that the print density changes or the color shift occurs at the entering or leaving portion.

Further, since the thermal head support link mechanism 3, the pinch roller support link 8 and the supply part support link 15 are operated only by the cam 16, each link mechanism is complicated and the number of parts is large, and a long arm is used. However, there is a problem in that the shape of parts is complicated.

The present invention has been made in order to solve the above problems. A first object of the present invention is to provide a capstan and a pinch roller even when printing is performed on the entire surface of a thick recording medium such as cards. The fluctuation of the transport load that occurs when the recording medium enters or leaves during this period is reduced to reduce the unevenness of the feeding of the recording medium between the capstan roller and the pinch roller, or to reduce the unevenness of printing. An object of the present invention is to obtain a printer device that can reduce the change in density or the occurrence of color shift. The second purpose is to reduce the number of parts,
To obtain a printer device that is easy to manufacture.

[0024]

In the printer apparatus according to the present invention, the pinch roller support means takes the open position when the thermal head support means is in the contact position, and the thermal head support means is in the retracted position when the thermal head support means is in the retracted position. Since the interlocking means for synchronously displacing the thermal head supporting means and the pinch roller supporting means is provided so that the pinch roller supporting means takes the press contact position, the recording medium plunges between the capstan and the pinch roller. It is possible to reduce the fluctuation of the transport load when the vehicle is detached.

Further, a rotary shaft which is rotationally driven by the driving means, a thermal head displacement cam which is fixed to the rotary shaft and engages with the thermal head supporting means, and a pinch which is fixed to the rotary shaft coaxially with the thermal head displacement cam. The pinch roller displacement cam engaging with the roller supporting means constitutes the interlocking means.

Further, a rotary shaft and a thermal head displacement cam,
The pinch roller displacement cam and the pinch cam follower constitute the interlocking means, and the first pinch arm, the second pinch arm and the pinch pressure spring constitute the pinch roller supporting means.

Further, the pinch roller support means is displaced to the open position when the thermal head support means is in the contact position, and the pinch roller support means is in the pressure contact position when the thermal head support means is in the retracted position. By providing a connecting pin for synchronously displacing the thermal head support means and the pinch roller support means, it is possible to reduce the fluctuation of the transport load when the recording medium enters and leaves between the capstan and the pinch roller. it can.

Further, the rotating shaft, the head displacement cam and the connecting pin constitute an interlocking means, and the first pinch arm, the second pinch arm and the pinch pressure spring constitute a pinch roller supporting means.

Further, a recording medium pressing member made of an elastic body, which is attached in pairs on both sides of the recording medium guide path, is provided between the platen and the pinch roller on the upper surface of the recording medium guide. It is possible to reduce the fluctuation of the carrying load when the recording medium enters and leaves between the stun and the pinch roller.

Further, on both sides of the recording medium guide path, on the upper surface of the recording medium guide at both the recording medium supply side and the discharge side near the platen and at both the recording medium supply side and the discharge side near the capstan. By providing the recording medium pressing member made of an elastic body that is attached in pairs, it is possible to reduce the fluctuation of the conveyance load when the recording medium enters and leaves between the capstan and the pinch roller.

Further, a slit parallel to the side edge of the recording medium is provided in a portion of the recording medium pressing member that abuts the vicinity of the side edge of the recording medium, and the edge of the portion abutting the recording medium is curved upward. Since it is composed of a leaf spring, it is possible to reduce the fluctuation of the carrying load when the recording medium enters and leaves between the capstan and the pinch roller.

Further, a punching having a circular cross section is provided in a portion of the recording medium pressing member which comes into contact with the recording medium, and the fluctuation of the carrying load when the recording medium enters and leaves between the capstan and the pinch roller. Can be made smaller.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION In the printer device according to the embodiment of the present invention, the pinch roller support means is in the open position and the thermal head support means is in the retracted position when the thermal head support means is in the contact position. In this state, the thermal head supporting means and the pinch roller supporting means are displaced synchronously so that the pinch roller supporting means takes the press contact position, so that the recording medium rushes between the capstan and the pinch roller which are pressed during printing. , Or withdrawal is avoided.

Further, a rotary shaft which is rotationally driven by the drive means, a thermal head displacement cam which is fixed to the rotary shaft and engages with the thermal head support means, and a pinch which is fixed to the rotary shaft coaxially with the thermal head displacement cam. Since the interlocking means is composed of the pinch roller displacement cam that engages with the roller supporting means, the number of parts can be reduced.

Further, the interlocking means comprises a rotary shaft, a thermal head displacement cam, a pinch roller displacement cam and a pinch cam follower, and the pinch roller supporting means comprises a first pinch arm, a second pinch arm and a pinch pressure spring. Since only the parts are used, the number of parts can be reduced.

Further, when the thermal head support means is in the contact position, the pinch roller support means is displaced to the open position by the connecting pin, and when the thermal head support means is in the retracted position, the pinch roller support means is in the press contact position. Since the thermal head supporting means and the pinch roller supporting means are configured to be displaced in synchronization with each other so that the recording medium enters or leaves between the capstan and the pinch roller pressed against each other during printing. Can be avoided.

Further, the rotary shaft, the head displacement cam, and the connecting pin constitute an interlocking means, and the pinch roller supporting means is the first.
Since the pinch arm, the second pinch arm, and the pinch pressure spring are used as the only three parts, the number of parts can be reduced.

Further, since the recording medium pressing member made of an elastic body increases the pressing force of the recording medium against the platen, unevenness in feeding is reduced, and the recording medium is smoothly guided by the recording medium pressing member.

Further, since the recording medium pressing member presses the recording medium against the platen and the pinch roller, the pinch roller, the pinch roller supporting means, and the interlocking means for displacing the pinch roller supporting means are unnecessary, and the number of parts is reduced.

Further, since the recording medium pressing member composed of the leaf spring is provided with the slit to facilitate the bending and the end portion is curved upward, the recording medium comes into contact with the recording medium pressing member,
Alternatively, the load fluctuation at the time of dissociation can be reduced.

Further, when the recording medium pressing member is embossed, the contact area between the recording medium pressing member and the recording member is reduced, the frictional force is reduced, and the recording medium comes into contact with or separates from the recording medium pressing member. The load fluctuation of can be reduced.

The present invention will be described below in detail with reference to the drawings showing the embodiments thereof. Embodiment 1 FIG. 1 is a perspective view of a printer device according to a first embodiment of the present invention, and FIG.
5 is a cross-sectional view for explaining the operation of the first embodiment, and the same or corresponding parts as in FIG. 19 of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 1, 22 is a base, 23 is a pair of side frames attached to both sides of the base 22, and 24 is a side frame.
Is a head unit support shaft rotatably supported by the side frame 23, 25 is a head frame attached to the head unit support shaft 24, 26 is a pair of head slide guides attached to the head frame 25, 2
7 is a thermal head holder to which the thermal head 2 is attached, which is supported by a head slide guide 26 so as to be vertically movable,
Reference numeral 28 denotes a head pressing spring whose upper end is attached to the head frame 25 and whose lower end is pressed against the thermal head holder 27. The head unit supporting shaft 24, the head frame 25, the head slide guide 26, the thermal head holder 27, and the head pressing spring 28. Head support means 1
00.

Reference numeral 29 is a cam shaft rotatably supported by the head frame 25, 30 is a head cam fixed to the cam shaft 29, 31 is a head cam follower which is attached to the thermal head holder 27 and engages with the head cam 30, and 32 is a head cam follower. Pinch cam fixed to the camshaft 29, 3
3 is a pinch slide guide provided on the side frame 23, 34 is a pinch cam follower that is supported by a pinch slide guide 33 so as to be vertically movable, and has an upper end engaged with the pinch cam 32. The cam shaft 29, the head cam 30, the head cam follower 31, The pinch cam 32, the pinch slide guide 33, and the pinch cam follower 34 constitute the interlocking means 101.

Reference numeral 35 denotes a base frame fixed to the base 22, 36 denotes a first arm shaft rotatably supported by the base frame 35, and 37 denotes both side surfaces of the base frame fixed to the first arm shaft 36. And a pair of first pinch arms, one end of which engages with the pinch cam follower 34, 38, with respect to the first arm shaft 35 of the first pinch arm 37, opposite the portion of engagement with the pinch cam follower 34. A first pinch shaft rotatably supported at an end portion, 39 is a second arm shaft rotatably supported by the base frame at a target position with respect to the platen 4 with respect to the first arm shaft 36, Reference numeral 40 denotes a shape symmetrical with respect to the first pinch arm 37 and the platen 4, and the second arm shaft 39 is provided on both side surfaces of the base frame 35.
A pair of second pinch arms, one end of which is engaged with the pinch cam follower 34, and 41 is a portion of the second pinch arm 40 that engages the pinch cam follower 34 with respect to the second arm shaft 39. A second pinch shaft rotatably supported at the opposite end, the first pin 42 has one end
Is a pinch pressure contact spring having the other end attached to the second pinch arm 40, the first arm shaft 36, the first pinch arm 37, the first pinch shaft 38, and the second arm. The shaft 39, the second pinch arm 40, the second pinch shaft 41, and the pinch pressure contact spring 42 constitute the pinch roller supporting means 102.

43 is a head motor base mounted on the head frame 25, 44 is a drive motor fixed to the head motor base 43, 45 is a drive motor pinion mounted on the rotary shaft of the drive motor 44, and 46 is a camshaft 29.
Is a cam gear that is fixed to the drive motor pinion 45 and meshes with the drive motor pinion 45.
5 and the cam gear 46 constitute the driving means 103.

Reference numeral 47 is a recording medium guide attached to the base frame 35 and having a hole through which the platen 4 and the capstan 5 pass, and 48 is a guide groove provided in the recording medium guide 47, the lower surface of the groove being the lower surface of the recording medium 1. The inner surface of the groove guides both side surfaces of the recording medium 1.

49 is a platen shaft that is rotatably supported by the base frame 35 and fixes the platen 4 in the center, 50 is a platen gear that is attached to the platen shaft 49, and 51 is a rotatably supported by the base frame 35 and is capped in the center. A capstan shaft for fixing the stun 5, 52 is a capstan gear attached to the capstan shaft 51, and 53 is a base 22.
An idler base mounted on the upper surface of the idler, and an idler gear 54 that is rotatably supported by the idler base and meshes with both the platen gear 50 and the capstan gear 52.
Reference numeral 55 is a transfer motor base fixed to the base 22, 56 is a transfer motor attached to the transfer motor base 55, and 57 is a transfer motor pinion fixed to the rotation shaft of the transfer motor 56 and meshing with the capstan gear 51.

Next, the operation will be described. FIG. 2 is a sectional view showing a state in which the recording medium 1 is supplied. In the figure,
Since the head cam 30 and the pinch cam 32 have the same shape, 1
It is displayed overlapping with one shape. At the time of supplying the recording medium, the head holder 27 is pushed up by the head cam 30, the thermal head 2 moves to the retracted position, and is separated from the platen 4. Also, the pinch cam follower 34 is
Since the sliding surface with the pinch cam 32 rises, it is pushed up by the contracting force of the pinch pressure contact spring 42 via the first pinch arm 37 and the second pinch arm 40, and the pinch roller 7 is accordingly capstan. Pressed against 5.

The supplied recording medium 1 is a pinch roller 7
Since the capstan 5 is pressed against the recording medium 1, the recording medium 1 can be conveyed by the frictional force generated by the rotation of the capstan 5. The recording medium 1 up to the print start position (a position where a part of the recording medium 1 is placed between the thermal head 2 and the platen 4)
Is conveyed and the supply of the recording medium 1 is completed. In this case, since the thermal head 2 has moved to the position retracted from the platen 4, when the recording medium 1 passes between the thermal head 2 and the platen 4, contact between the end of the recording medium 1 and the thermal head 2 causes It is possible to prevent damage to the thermal head 2.

FIG. 3 shows that after the supply of the recording medium 1 is completed,
FIG. 3 is a cross-sectional view showing a state when printing is started. At the time of printing, the camshaft 29 has rotated since the recording medium 1 shown in FIG. 2 was supplied, and the head cam 30 and the pinch cam 32 have rotated 180 °. In this state, the contact position between the head cam 30 and the head cam follower 31 is lowered,
The head holder 27 descends and the thermal head 2 is pressed against the platen 4 via the ink sheet 9 and the recording medium 1. At the same time, the pinch cam 32 moves the pinch cam follower 34.
And the pinch cam follower 34 further pushes down the arm of the first pinch arm 37 and the second pinch arm 40 on the side where the pinch roller 7 is not attached, so that the first pinch arm 37 and the second pinch arm 40
Rotates and the pinch roller 7 is disengaged from the capstan 5.

That is, the head cam 30 and the pinch cam 3
Since the two are fixed to the same cam shaft 29, the thermal head 2 and the platen 4 can be pressure-bonded and retracted, and the capstan 5 and the pinch roller 7 can be pressure-contacted and disengaged in a synchronized manner. Further, the operation of the thermal head 2 and the platen 4 and the operation of the capstan 5 and the pinch roller 7 are such that the capstan 5 and the pinch roller 7 are disengaged when the thermal head 2 and the platen 4 are in pressure contact, When retracted from the platen 4, the capstan 5 and the pinch roller 7 are pressed against each other. In the following description, the state in which the thermal head 2 and the platen 4 are pressure-bonded and the capstan 5 and the pinch roller 7 are disengaged is the "first mode", the thermal head 2 is retracted from the platen 4, and the capstan 5 and the pinch roller 7 The state in which is pressed is referred to as "second mode".

In the first mode, the thermal head 2
When the platen 4 is rotated while being pressed against the platen 4, the recording medium 1 and the ink sheet 9 sandwiched between the thermal head 2 and the platen 4 are conveyed. When the platen 4 is rotated and the thermal head 2 is energized to generate heat, the ink is transferred from the ink sheet 9 to the recording medium 1 to print one color.

FIG. 4 is a sectional view showing the state at the end of printing. Recording medium 1 is printed from FIG. 3 to FIG. 4 during printing.
The leading end of the recording medium 1 projects between the capstan 5 and the pinch roller 7, and the trailing end of the recording medium 1 separates from between the capstan 5 and the pinch roller 7. However, in the first mode, since the capstan 5 and the pinch roller 7 are not pressure-bonded to each other, the transport load fluctuation when the recording medium 1 enters and leaves the capstan 5 and the pinch roller 7 is reduced.

FIG. 5 is a sectional view showing a state in which the mode is shifted to the second mode after printing one color. After printing one color, rotate the head shaft 29 again 180 °
Mode, the thermal head 2 is retracted from the platen 4, and the pinch roller 7 is pressed against the capstan 5. In the second mode, since the pinch roller 7 presses the recording medium 1 onto the capstan 5, the capstan 5
The recording medium 1 is conveyed by rotating. Further, since the thermal head 2 is retracted from the platen 4, contact between the end of the recording medium 1 and the thermal head 2 when the recording medium 1 passes between the thermal head 2 and the platen 4 is avoided, and the thermal head The damage of 2 can be avoided. Further, since the ink sheet 9 is also not sandwiched between the thermal head 2 and the platen 4 in the second mode,
It is possible to feed and stop the recording medium 1 and the platen 4 irrespective of the operation of the recording medium 1 and to easily find the head.

In a normal color printer, three color inks of yellow, magenta and cyan, or four color inks of yellow, magenta, cyan and black are sequentially superposed and printed to obtain a color image. In the first embodiment, after the recording medium 1 is supplied in the second mode, one color is printed in the first mode, and the recording medium 1 is conveyed again to the printing start position in the second mode. At the same time, the operation of cueing the next color of the ink sheet 9 and then printing the next color again in the first mode is repeated three or four times, and after the printing is completed, the recording medium 1 is printed in the second mode. By discharging, a color image can be printed.

Embodiment 2 6 is a perspective view of a printer device according to a second embodiment of the present invention, and FIGS. 7 and 8 are sectional views for explaining the operation of the printer device according to the second embodiment. FIGS. 1 of Embodiment 1, which are the same as or corresponding to those in FIG.

In FIG. 6, reference numeral 58 is a connecting pin which is fixed to the head holder 27 and engages with the first pinch arm 37 and the second arm shaft 39.

Next, the operation will be described. As in the first embodiment, by rotating the head cam 30, the head holder 27 is vertically displaced via the head cam follower 31, and the thermal head 2 can be pressed against the platen 4 and dissociated. As shown in FIG. 7, when the thermal head 2 is separated from the platen 4, the connecting pin 58 fixed to the head holder 27 is displaced upward together with the head holder 27. Therefore, the engagement point of the connecting pin 58, the first pinch arm 37, and the second pinch arm 40 also rises, and with respect to the first arm shaft 36 and the second pinch arm 40, the first pinch arm 37 and the first pinch arm 37 2 pinch arms 40
The pinch roller 7 attached to the opposite side of the engagement point with the connecting pin 58 of the is lowered, and is pressed against the capstan 5.

On the other hand, as shown in FIG. 8, when the thermal head 2 is in contact with the platen 4, the head holder 27
The connecting pin 58 fixed to is displaced downward together with the head holder 27. Therefore, the engagement point of the connecting pin 58, the first pinch arm 37, and the second pinch arm 40 is lowered, and the first pinch arm 37 and the first pinch arm 37 and the second pinch arm 40 with respect to the first arm shaft 36 and the second pinch arm 40. The pinch roller 7 attached to the side opposite to the engagement point of the second pinch arm 40 with the connecting pin 58 rises and disengages from the capstan 5.

As described above, by providing the connecting pin 58 and interlocking the movement of the thermal head 2 and the movement of the pinch roller 7, the pinch roller 7 is moved from the capstan 5 when the thermal head 2 is in contact with the platen 4. When the thermal head 2 is dissociated and the thermal head 2 is dissociated from the platen 4, the pinch roller 7 is pressed against the capstan 5.
The thermal head 2 and the pinch roller 7 can be interlocked.

Embodiment 3 FIG. 9 is a perspective view of the printer device according to the third embodiment, and FIG. 10 is a sectional view for explaining the operation of the third embodiment. The same reference numerals are given to the same or corresponding portions as in FIG. 19 of the conventional example and FIG. 1 of the first embodiment, and the description thereof will be omitted.

In FIG. 9, 59 is a recording medium guide 47.
It is a recording medium pressing member made of an elastic body, which is attached in a pair on both sides of the guide groove 48 at a position between the platen 4 and the pinch roller 7 on the upper surface of the recording medium pressing member.

As shown in FIG. 10, when the recording medium 1 passes between the guide groove 48 and the recording medium pressing member 59, the lower surface of the recording medium pressing member 59 makes sliding contact with the upper surface of the recording medium 1. Since the recording medium pressing member 59 is made of an elastic material, the portion of the recording medium pressing member 59 that is in sliding contact with the recording medium 1 is deformed upward and a downward force is applied to the recording medium 1 to press it against the platen 4. Increase power.

FIG. 11 is a diagram showing the relationship between the pressure contact force of the recording medium 1 against the platen 4 and the positional deviation of the recording medium 1 in the carrying direction. As shown in the figure, when the pressure contact force between the recording medium 1 and the platen 4 is small, the recording medium 1 and the platen 4 slip,
Since the recording medium 1 cannot be conveyed, the positional deviation in the recording medium conveying direction becomes large. As the pressing force increases, the frictional force between the recording medium 1 and the platen 4 increases, and the positional deviation in the recording medium conveyance direction decreases, so that it is possible to print with good image quality. When the recording medium pressing member 59 is provided, the frictional force acting between the platen 4 and the recording medium 1 is increased, the positional deviation of the recording medium 1 in the transport direction is reduced, and the print density change or the color due to the uneven feeding is caused. The deviation is reduced. Further, since the contact pressure of the recording medium 1 against the platen 4 can be secured by the recording medium pressing member 59, the pressing P1 of the thermal head 2 against the platen 4 can be reduced to prolong the life of the thermal head 2. In an experiment using a credit card conforming to JIS X6301, when the contact pressure of one recording medium pressing member 59 with the recording medium 1 is 60 to 240 gf, a good print image quality with a small positional deviation in the transport direction is obtained. Was given.

Furthermore, since the recording medium pressing member 59 is made of an elastic body, it deforms when it comes into contact with the recording medium 1 and abrupt transport load fluctuations can be avoided. Further, since the recording medium pressing member 59 presses the recording medium 1 against the guide groove 48 and guides it smoothly, when the recording medium 1 enters or leaves the capstan 5 and the pinch roller 7, the recording medium 1
Keeps a predetermined posture, so that the capstan 5 or the pinch roller 7 and the end of the recording medium 1 are prevented from coming into strong contact with each other. As a result, a change in print density or a color shift due to uneven feeding due to the protrusion or the separation of the recording medium 1 between the capstan 5 and the pinch roller 7 is reduced.

Fourth Embodiment 12 is a perspective view of a printer device according to a fourth embodiment of the present invention, and FIGS. 13 to 16 are sectional views for explaining the operation of the fourth embodiment. The same reference numerals are given to the same or corresponding portions as in FIG. 19 of the conventional example and FIG. 1 of the first embodiment, and the description thereof will be omitted.

In FIG. 12, reference numeral 60 denotes the recording medium guide 4
A first recording medium pressing plate 61 made of an elastic body, which is attached in pair on both sides of the guide groove 48 at both the supply side and the discharge side of the recording medium 1 near the platen 4 on the upper surface of 7, Capstan 5 on top of recording medium guide 47
It is a second recording medium pressing plate made of an elastic body, which is attached in pairs on both sides of the guide groove 48 at positions near the recording medium supply side and the discharge side.

As shown in FIGS. 13 to 16, the recording medium 1
The recording medium 1 is in sliding contact with the first recording medium pressing plate 60 or the second recording medium pressing plate 61 regardless of the positional relationship between the platen 4 and the capstan 5. Since the first recording medium pressing plate 60 and the second recording medium pressing plate 61 are made of an elastic body, the first recording medium pressing plate 60 and the second recording medium pressing plate 61 slide on the recording medium 1. The contact portion is deformed upward and a downward force is applied to the recording medium 1 to press the recording medium 1 against the platen 4 or the capstan 5. Therefore, the recording medium 1 can be conveyed without providing a pinch roller.

Furthermore, since the first recording medium pressing plate 60 and the second recording medium pressing plate 61 are made of an elastic body, they deform when contacted with the recording medium 1 and abrupt transport load fluctuations can be avoided. . For this reason, the recording medium 1 is the first
Recording medium pressing plate 60 or second recording medium pressing plate 61
Since the change in the carrying load of the recording medium 1 is small even if the recording medium 1 rushes into the guide groove 48 or separates from the guide groove 48, the occurrence of uneven feeding can be reduced. Therefore, the first recording medium pressing plate 60 and the second recording medium pressing plate 6
1 may be in contact with or separated from the recording medium 1 even during printing, and a mechanism for moving the pinch roller in order to prevent contact with or separation from the recording medium 1 unlike the pinch roller is not required. Therefore, in the fourth embodiment,
It is possible to simplify the configuration by reducing the number of parts of the printer device and the number of movable members.

Embodiment 5 FIG. 17 is a view showing a fifth embodiment of the present invention and is a perspective view of a recording medium pressing member 59.

In the figure, 59a is a recording medium pressing member 5.
A slit 59b provided in parallel with the side end of the recording medium 1 at a portion of the recording medium 9 that contacts the vicinity of the side end of the recording medium 1 is directed upward toward the end of the contact portion of the recording medium pressing member 59 with the recording medium 1. The curved portion provided.

In the fifth embodiment, the recording medium pressing member 5
Since the slit 59a is provided in the recording medium pressing member 9,
The contact portion of the recording medium 9 with the recording medium 1 is easily bent, and the impact at the time of contact with or separation from the recording medium 1 is buffered. Further, since the curved portion 59b is provided at the end of the contact portion of the recording medium pressing member 59 with the recording medium 1, contact and disengagement between the recording medium 1 and the recording medium pressing member 59 occur at this curved portion 59b, and the curved portion 59b bends. Since the recording medium 1 is smoothly guided by, the shock at the time of contact and disengagement is buffered. Therefore, by configuring the recording medium pressing member 59 with the shape shown in the sixth embodiment, uneven feeding due to the protrusion or the separation between the guide groove 48 of the recording medium 1 and the recording medium pressing member 59 is caused. Changes in print density or color shift are reduced.

In the fifth embodiment, the recording medium pressing member 5
Although the case where 9 is composed of a leaf spring is shown, the same operation can be performed even if it is composed of another elastic member.

Embodiment 6 FIG. FIG. 18 shows the sixth embodiment of the present invention and is a perspective view of the recording medium pressing member 59. In the figure, reference numeral 59c designates a stamp having a circular cross section, which is provided in a portion where the recording medium pressing member 59 contacts the recording medium 1.

In the sixth embodiment of the present invention, the embossing 59c provided on the recording medium pressing member 59 reduces the contact area between the recording medium pressing member 59 and the recording medium 1 member, and reduces the frictional force. Since the load variation when the recording medium 1 comes into contact with or separates from the recording medium pressing member 59 is also reduced, the change in the print density or the color shift due to the uneven feeding due to the load variation is reduced.

[0077]

Since the present invention is constructed as described above, it has the following effects.

In the printer device according to the present invention, the pinch roller supporting means takes the open position when the thermal head supporting means is in the abutting position, and the pinch roller supporting means is in the press contact position when the thermal head supporting means is in the retracted position. As described above, since the interlocking means for synchronously displacing the thermal head supporting means and the pinch roller supporting means is provided, the recording medium enters or leaves between the capstan and the pinch roller pressed against each other during printing. Can be avoided. As a result, fluctuations in the transport load that occur when the recording medium plunges into or out of the capstan roller and pinch roller are reduced, and there is uneven feeding due to plunging or detaching of the recording medium between the capstan roller and pinch roller. It is possible to reduce the change in print density or the color shift that is the cause.

Further, a rotating shaft connected to the driving means by the interlocking means and rotated by the driving means, a thermal head displacement cam fixed to the rotating shaft and engaged with the thermal head supporting means, and the thermal head displacement cam. The pinch roller displacement cam fixed to the rotary shaft coaxially with and engaging with the pinch roller supporting means reduces the number of parts.

Further, the interlocking means is constituted by a rotary shaft, a thermal head displacement cam, a pinch roller displacement cam and a pinch cam follower, and the pinch roller supporting means is constituted by a first pinch arm, a second pinch arm and a pinch pressure spring. Since it is composed of three parts, the number of parts is reduced.

Further, the pinch roller supporting means is displaced to the open position when the thermal head supporting means is in the contact position by the connecting pin, and the pinch roller supporting means is in the press contact position when the thermal head supporting means is in the retracted position. The thermal head support means and the pinch roller support means are synchronously displaced so that This prevents the recording medium from entering or leaving between the capstan and the pinch roller, which are pressed against each other during printing, so that when the recording medium enters or leaves between the capstan and the pinch roller. Variations in the transport load that occur are reduced, and it is possible to reduce changes in print density or color misregistration due to uneven feeding due to rushing or separation of the recording medium between the capstan roller and the pinch roller.

Further, the interlocking means comprises a rotary shaft, a head displacement cam, and a connecting pin, and the pinch roller supporting means comprises three parts, a first pinch arm, a second pinch arm, and a pinch pressure spring. Since it can be configured, the number of parts is reduced.

Further, the pressing force of the recording medium against the platen is increased by the recording medium pressing member made of an elastic material, so that the recording medium conveying force is increased and the unevenness of feeding is reduced. Further, since the recording medium is smoothly guided by the recording medium pressing member, fluctuations in the conveyance load that occur when the recording medium enters or leaves the capstan and the pinch roller are reduced, and the recording medium capstan It is possible to reduce a change in printing density or a color shift due to uneven feeding due to rushing in or out of the pinch rollers.

Further, since the recording medium pressing member presses the recording medium against the platen and the pinch roller, the pinch roller, the pinch roller supporting means, and the interlocking means for displacing the pinch roller supporting means are unnecessary, and the number of parts is reduced.

Further, since the recording medium pressing member composed of the leaf spring is provided with the slit to facilitate the bending and the end portion is curved upward, the recording medium comes into contact with the recording medium pressing member,
Alternatively, it is possible to reduce the load fluctuation at the time of dissociation, and it is possible to reduce the print density change or the color misregistration caused by the unevenness of the feeding due to the load fluctuation.

Further, the ejection provided on the recording medium pressing member reduces the contact area between the recording medium pressing member and the recording member to reduce the frictional force, and the recording medium comes into contact with or separates from the recording medium pressing member. Since the load fluctuation at the time is also reduced, it is possible to reduce the print density change or the color misregistration caused by the unevenness of the feeding due to the load change.

[Brief description of the drawings]

FIG. 1 is a perspective view of a printer device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view for explaining the operation of the printer device according to the first embodiment when a recording medium is supplied.

FIG. 3 is a cross-sectional view for explaining the operation of the printer device according to the first embodiment during printing.

FIG. 4 is a cross-sectional view for explaining the operation of the printer apparatus according to the first embodiment when printing is completed.

FIG. 5 is a cross-sectional view for explaining the operation of the printer device according to the first embodiment after printing is completed.

FIG. 6 is a perspective view of a printer device according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view for explaining the operation of the printer device according to the second embodiment when the thermal head is raised.

FIG. 8 is a cross-sectional view for explaining the operation of the printer device according to the second embodiment when the thermal head descends.

FIG. 9 is a perspective view of a printer device according to a third embodiment of the present invention.

FIG. 10 is a sectional view for explaining the operation of the printer device according to the third embodiment.

FIG. 11 is a diagram showing the relationship between the pressure contact force of the recording medium to the platen and the positional deviation of the recording medium in the transport direction.

FIG. 12 is a perspective view of a printer device according to a fourth embodiment of the present invention.

FIG. 13 is a cross-sectional view for explaining the operation of the printer device according to the fourth embodiment when a recording medium is supplied.

FIG. 14 is a cross-sectional view for explaining an operation at the start of printing by the printer device according to the fourth embodiment.

FIG. 15 is a cross-sectional view for describing the operation of the printer according to the fourth embodiment when printing is completed.

FIG. 16 is a cross-sectional view for explaining the operation of the printer according to the fourth embodiment after printing is completed.

FIG. 17 is a perspective view showing a fifth embodiment of the present invention.

FIG. 18 is a diagram showing a sixth embodiment of the present invention.

FIG. 19 is a configuration diagram of a conventional printer device disclosed in Japanese Patent Laid-Open No. 2-98470.

FIG. 20 is a perspective view of a cam used in a conventional printer device.

FIG. 21 is a front view showing the shape of a first cam groove used in a conventional printer device.

FIG. 22 is a front view showing the shape of a second cam groove used in a conventional printer device.

FIG. 23 is a front view showing a shape of an outer peripheral surface of a cam used in a conventional printer device.

FIG. 24 is a cross-sectional view for describing an operation in mode 2 of the conventional printer device.

FIG. 25 is a cross-sectional view for describing an operation in mode 3 of the conventional printer device.

FIG. 26 is a cross-sectional view for describing an operation in mode 4 of the conventional printer device.

[Explanation of symbols]

1 recording medium, 2 thermal head, 4 platen, 5
Capstan, 7 pinch roller, 29 cam shaft, 30 head cam, 31 head cam follower, 3
2 pinch cam, 34 pinch cam follower, 36 first arm shaft, 37 first pinch arm, 39
Second arm shaft, 40 second pinch arm,
44 drive motor, 45 head motor pinion, 46
Cam gear, 47 recording medium guide, 48 guide groove,
58 connecting pin, 59 recording medium pressing member, 60 first
Recording medium pressing plate, 61 second recording medium pressing plate, 62
Slits, 63 curved portions, 64 ejections, 100 head supporting means, 101 interlocking means, 102 pinch roller supporting means, 103 driving means.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshinori Kakuda 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd. (72) In-house Kunihiko Nakagawa 2-3-2, Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd.

Claims (9)

[Claims] 1. A printer device comprising a thermal head, a platen, a capstan axially supported in parallel with the platen, and a pinch roller facing the capstan, wherein the thermal head is in contact with the platen. And a thermal head supporting means that displaceably supports at least two positions of a position retracted from the abutting position of the platen, and a position where the pinch roller is pressed against the capstan and a pressure contact between the capstan is released. A pinch roller support means for displaceably supporting the position,
When the thermal head supporting means is in the abutting position, the pinch roller supporting means is in the open position, and when the thermal head supporting means is in the retracted position, the pinch roller supporting means is in the pressure contact position. A printer apparatus comprising: interlocking means for synchronously displacing the head supporting means and the pinch roller supporting means, and a driving means for operating the interlocking means. 2. The interlocking device includes a rotary shaft that is rotationally driven by the drive device, a thermal head displacement cam that is fixed to the rotary shaft and that engages with a thermal head supporting device, and a coaxial shaft with the thermal head displacement cam. 2. The printer device according to claim 1, further comprising a pinch roller displacement cam fixed to the rotary shaft and engaging with a pinch roller supporting means. 3. The rotary shaft, which is rotationally driven by the drive unit, the thermal head displacement cam fixed to the rotary shaft and engaged with the thermal head supporting unit, and the thermal head displacement cam being coaxial with each other. The pinch roller displacement cam fixed to the rotating shaft and engaged with the pinch roller supporting means and the pinch cam follower engaged with the pinch roller displacement cam and supported so as to be movable up and down, support the pinch roller supporting means. A first pinch arm rotatably supported by a shaft, one end of which engages with the pinch cam follower, and rotatably supports a pinch roller on the multi-end side sandwiching the engaging portion and the support shaft; 1 pinch arm and the pinch cam follower are symmetrical with respect to the central axis of the pinch cam follower, and the first pinchia with respect to the central axis of the pinch cam follower. A rotatably supported by a support shaft at a position symmetrical to the dome, and one end of which engages with the pinch cam follower and rotatably supports a pinch roller at a multi-end opposite to the engaging portion and a support point. Two pinch arms and one end are connected to the first pinch arm and multiple ends are connected to the second pinch arm so that both the first pinch arm and the second pinch arm are brought into contact with the capstan by the pinch roller. 2. The printer device according to claim 1, wherein the printer device comprises a pinch pressure spring that urges in a contacting direction. 4. A printer device including a thermal head, a platen, a capstan axially supported in parallel with the platen, and a pinch roller facing the capstan, wherein the thermal head contacts the platen. A thermal head supporting means that is displaceably supported in at least two positions, a position retracted from a contact position between the platen and the platen, a driving means that displaces the thermal head supporting means, and the pinch roller on the capstan. A pinch roller supporting means for displaceably supporting a position where pressure is applied and a position where the capstan is released from pressure contact;
A connecting pin that is attached to the thermal head supporting means and engages with the capstan supporting means, and the connecting pin moves the pinch roller supporting means to the open position when the thermal head supporting means is in the abutting position. The thermal head support means and the pinch roller support means are displaced in synchronization so that the pinch roller support means takes a press contact position when the thermal head support means is in the retracted position. A printer device characterized by the above. 5. A rotary shaft for rotating the interlocking device by the drive device, a thermal head displacement cam fixed to the rotary shaft and engaging with a thermal head supporting device, and a thermal head of the thermal head supporting device. The pinch roller support means is rotatably supported by a support shaft so that one end of the pinch roller support means engages with the interlocking pin to sandwich the support shaft with the engaging portion. A first pinch arm that rotatably supports the pinch roller at the other end side and a shape that is symmetrical to the first pinch arm with respect to an axis parallel to the displacement direction of the thermal head that passes through the center of the connecting pin. And one end portion of which is rotatably supported by a support shaft that is symmetrical to the first pinch arm with respect to an axis that passes through the center of the connecting pin and is parallel to the displacement direction of the thermal head. And a second pinch arm that rotatably supports the pinch roller at the other end opposite to the engaging point with respect to the engaging portion and the support point, and one end is connected to the first pinch arm. The end is connected to the second pinch arm, and both the first pinch arm and the second pinch arm are constituted by a pinch pressure spring for urging the pinch roller in the direction in which the pinch roller contacts the capstan. The printer device according to claim 4. 6. A recording medium guide for guiding the lower surface and both side surfaces of the recording medium in sliding contact with each other, a thermal head arranged on the upper surface side of the recording medium, and a platen facing the thermal head with a recording medium guide path interposed therebetween. A thermal head support means for displaceably supporting the thermal head in at least two positions, a position in contact with the platen and a position retracted from the position in contact with the platen, and a shaft supported in parallel with the platen. In a printer device including a capstan and a pinch roller facing the capstan with a recording medium guide path in between, a position where the pinch roller is pressed against the capstan and a position where the pinch roller is released from the pressure contact with the capstan. Between the platen and the pinch roller on the upper surface of the recording medium guide, the pinch roller supporting means movably supporting the pinch roller. And a recording medium pressing member made of an elastic body, which is attached to both sides of the recording medium guide path in a pair, so that the lower surface of the pressing member comes into pressure contact with the upper surface of the recording medium when the recording medium passes. A printer device having a configuration. 7. A recording medium guide for guiding the lower surface and both side surfaces of the recording medium in sliding contact with each other, a thermal head disposed on the upper surface side of the recording medium, and a platen facing the thermal head with a recording medium guide path interposed therebetween. A thermal head support means for displaceably supporting the thermal head in at least two positions, a position in contact with the platen and a position retracted from the position in contact with the platen, and a shaft supported in parallel with the platen. In a printer device including a capstan, on the recording medium guide upper surface at both the recording medium supply side and the discharge side position near the platen and at both the recording medium supply side and the discharge side position near the capstan. A recording medium pressing member made of an elastic body, which is attached to each side of the recording medium guide path in a pair, and presses when the recording medium passes. A printer device, wherein a lower surface of the member is configured to be in pressure contact with an upper surface of the recording medium. 8. A slit parallel to the recording medium side end is provided in a portion of the recording medium pressing member that abuts on the vicinity of the recording medium side end, and the end of the portion abutting the recording medium is curved upward. 5. A leaf spring, which is a flat spring.
Alternatively, the printer device according to claim 5. 9. The printer device according to claim 4, wherein a stamping having a circular cross section is provided in a portion of the recording medium pressing member that comes into contact with the recording medium.