JPH0441263A - Color printer - Google Patents

Abstract

PURPOSE:To make a color printer compact without occurrence of color deviation by increasing the pressing force for a capstan of a pinch roller with a biasing force of a spring, holding with pressure a recording paper by the pinch roller and capstan so as to convey the paper by the rotation of the capstan. CONSTITUTION:A recording paper 21 is guided between a capstan 45 and a pinch roller 46. With a movement of a link 62, the biasing force of a spring 68 in the direction of an axis 61 with respect to a link 63 increases, so that a pressing force of the pinch roller 46 to the capstan 45 increases. The recording paper 21 is held between the pinch roller 46 and the capstan 45. The capstan 45 rotates reversely so as to return the recording paper 21 to a supply side by a fixed quantity, so as to take out a head of print starting position. A head lever 38 further rotates so as to stick a thermal head 34 to a platen roller 32 through an ink sheet 41 and the recording paper 21. When the capstan 45 rotates normally, the thermal head 34 is energized so as to start a printing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] <Industrial Application Fields> The present invention relates to a high-definition color printing device for making hard copies of television images and the like.

(Prior Art) Conventionally, images from personal computers, camera-integrated video tape recorders, electronic still cameras, and the like have been soft-copied using display devices capable of high-resolution display. Recently, color printing devices that can display high-definition images in full color have been developed as devices for hard copying images from these information sources.

FIG. 11 is an explanatory diagram showing such a conventional color printing apparatus. This device uses recording paper cut to a predetermined length.

The platen roller 1 is provided with a holder 3 that is biased in the axial direction of the platen roller 1 and holds the leading edge of the recording paper 2. The recording paper 2 is held in pressure contact with the platen roller 1 by the holder 3 and wound. On the other hand, ink such as yellow, cyan, and magenta is applied cyclically to the ink sheet 4 in a predetermined order, and during recording, the ink sheet 4 and the recording paper 2 are transferred to the platen roller by the thermal head 5. is pressed against. and,
As the platen roller l rotates in the direction A, a heating element (not shown) of the thermal head 5 generates heat in response to the video signal. Due to this heat, the ink applied to the ink sheet 4 sublimates and is transferred and recorded onto the recording paper 2.

In this way, when the recording of the first color (for example, cyan) is completed, the thermal head 5 separates from the platen roller 1, and the platen roller 1 rotates in the direction A to print on the recording paper.
is conveyed to the same position as the recording start position of the first color. Further, the ink sheet 4 is wound up in the B direction until the second color (for example, yellow) comes to the recording start position. The thermal head 5 presses the ink sheet 4 and the recording paper 2 against the platen roller 1 again, and performs transfer recording of the second color based on the video signal. In the same manner, transfer recording of the third color (magenta) is also performed.

When recording is completed, the thermal head 5 separates from the platen roller 1, and the platen roller 1 rotates in the A direction.

When the rear end of the recording paper 2 reaches the position where it is pressed by the pressure roller 6, the Latin roller 1 rotates in the direction C, and the recording paper 2
The rear end is guided between recording paper guide members 7,8. Then, the recording paper 2 is released from the holder 3 and ejected.

In this way, each color is transferred sequentially, and there is a risk that color misregistration may occur. For this reason, in FIG. 11, a pressure roller 9 is provided, and the recording paper 2 near the thermal head 5 is
is firmly pressed against the platen roller 1 to prevent color misregistration. However, since the recording paper 2 is entirely wound around the platen roller 1, a platen roller whose circumference is longer than the length of the recording paper is required.

Therefore, in order to be able to use large-sized recording paper, the platen roller also needs to be made large, which poses a problem of increasing the size of the apparatus.

Therefore, a reciprocating recording type apparatus is sometimes adopted in which the occurrence of color shift is prevented by conveying the recording paper while being held between a capstan and a pinch roller.

FIG. 12 is a perspective view showing such a conventional color printing apparatus disclosed in Japanese Utility Model Application Publication No. 1-1.56942.

The capstan 10 is driven by a drive device (not shown) and is rotatable. On the other hand, the pinch roller 11 is rotatable around a pivot 12, and the pivot 12 is provided at the tip of a mounting member 14 fixed to a support shaft 13. By rotating the support shaft 13, the pivot shaft 12 provided at the tip of the mounting member 14 is rotated.
sways. That is, as the support shaft 13 rotates, the pinch roller 11 swings around the support shaft 13 and moves in a direction away from the capstan 10, or the pinch roller 11 moves away from the capstan 10.
Move so that it is pressed to 0.

The swinging of this pinch roller 11 is controlled by a plate-shaped pinch lever 15.
controlled by That is, the end of the support shaft 13 is fixed to one end of the pinch lever 15, and as the pinch lever 15 rotates, the support shaft 13 rotates and the pinch roller 11 swings. The other end of the pinch lever 15 is urged downward by a spring 16. The pinch roller 11 is pressed against the capstan 10 by this biasing force. By increasing the ratio (lever ratio) between the distance from the support shaft 13 to the spring 16 and the distance from the support shaft 13 to the pivot shaft 12, the pressing force of the pinch roller 11 against the capstan 10 by the spring 16 increases.

Furthermore, an adjusting means 17 for adjusting the movement of the pinch lever 15 is provided at the center of the pinch lever 15.

The adjusting means 17 includes a cam 18, a motor 19 for driving the cam 18, and a protrusion 20 provided at the center of the pinch lever 15. When the motor 19 rotates the cam 18, the protrusion 20 moves up and down according to the cam surface, and the support shaft 1
Rotate 3.

During paper feeding, the pinch roller 11 is separated from the capstan 10 by the adjusting means 17, and the recording paper (not shown) is conveyed between the pinch roller 11 and the capstan 10. During recording, the adjusting means 17 presses the pinch roller 11 against the capstan 10 via the recording paper. As the capstan 10 rotates, the recording paper is moved to the pinch roller 1.
1 and the capstan 10 and transported. This prevents color misregistration without winding the recording paper around the platen roller.

Incidentally, in order to prevent misregistration of the three colors, it is necessary for the pinch roller 11 to press the recording paper against the capstan 10 with a large force.

For this reason, the lever ratio is configured to be large. That is, the length of the pinch lever 15 is relatively long, and there is a problem in that the apparatus becomes large in size in order to secure a space for configuring the pinch lever 15.

(Problem to be Solved by the Invention) As described above, in the conventional color printing apparatus shown in FIG. 11, in order to prevent color misregistration, the recording paper is entirely wrapped around the platen roller, so that it can be used. In order to increase the size of recording paper, it is necessary to increase the size of the platen roller, which causes the problem of increasing the size of the device.Furthermore, in the conventional example shown in FIG. Therefore, it is necessary to increase the lever ratio, which poses a problem in that the device becomes large.

The present invention has been made in view of such problems, and includes:
An object of the present invention is to provide a color printing device that can be miniaturized without causing color misregistration.

[Structure of the Invention] (Means for Solving the Problems) A color printing apparatus according to the present invention includes a paper feed case for storing recording paper, a paper ejection case for storing the recording paper after recording, and a paper ejection case for storing the recording paper after recording. A pinch roller and a capstan for conveying the recording paper in the forward and reverse directions, a recording paper feeding means for feeding the recording paper from the paper feeding case, and a recording paper fed from the paper feeding case between the pinch roller and the capstan. A paper feed guide that guides between the capstans, a paper ejection guide that guides the recording paper conveyed by the pinch roller and the capstan to the paper ejection case, and a paper ejection guide that rotatably supports the pinch roller and is centered around a support shaft. a pinch lever that swings to move the pinch roller toward the capstan; a first link that is locked at one end to a pin provided on the pinch lever and has a guide section at the other end; a shaft that engages with a guide portion of the link and generates a pressing force for swinging the pinch lever; one end of the shaft is locked to the shaft, and a pin of the pinch lever is locked to a guide portion provided at the other end. a second link that fits together, and a spring that is locked to opposing ends of the first and second links and transmits a pressing force of the shaft against the second link to the first link. It is something.

(Function) In the present invention, during paper feeding, the recording paper from the paper feeding case is conveyed between the pinch roller and the capstan by the paper feeding guide. The shaft presses against the second link. This pressing force is transmitted to the first link via the spring, and then to the pinch lever to swing the pinch lever and move the pinch roller toward the capstan. The pinch roller is pressed against the capstan via the recording paper. The shaft presses against the second link even after the pinch roller is pressed against the capstan. The guide portions of the first link and the second link are guided by the bottle and the shaft, respectively, and slide against the biasing force of the spring.

The biasing force of this spring increases the pressing force of the pinch roller against the capstan. In this way, the recording paper is held in pressure contact with the pinch roller and the capstan, and is conveyed as the capstan rotates. Unlike the conventional method, there is no need to wrap the recording paper around the platen roller, making the apparatus more compact and achieving good registration. After recording is completed, the recording paper conveyed by the pinch roller and capstan is sent to a paper ejection case by a paper ejection guide.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings. FIG. 1 is a partially sectional front view showing an embodiment of a color printing apparatus according to the present invention.

A paper feed case 22 that can accommodate a plurality of recording papers 21 is disposed on the lower side of one side of the housing 40 . A paper discharge case 23 is arranged above the paper feed case 22, into which the recording paper 21 after printing is sent.

Further, a recording section 24 is provided on the other side of the housing 40, and the recording section 24 transfers and records information onto the recording paper 21 fed from the paper feed case 22.

The recording paper 21 is pulled out from the paper feed case 22 by a paper feed roller 25. That is, an opening 26 is formed in the upper part of the paper feed case 22 on the side of the recording section 24, and a paper feed roller 25 is disposed opposite to the opening 26. The recording paper 21 is
lifted in the direction of the opening 26 by the lever 27;
It is pressed by the paper feed roller 25. As the paper feed roller 25 is rotated by a DC motor (not shown) or the like, the recording paper 21 in contact with the paper feed roller 25 is fed to the recording section 24 through the opening 26 .

The recording paper 21 fed from the paper feed case 22 is provided between a return guide 28 and a paper feed guide 29.

A return guide 30 is located opposite the paper feed guide 29.
A switching guide 31 is provided between the paper feed guide 29 and the return guide 30. The recording paper 21 is placed in the return guide 28. After being conveyed substantially horizontally by the paper feed guide 29 and the switching guide 31, the direction is changed diagonally upward at the end of the paper feed guide 29, and the paper is conveyed toward the platen roller 32 side.

The platen roller 32 has a cylindrical shape whose outer periphery is made of an elastic material, and is rotatable about a support shaft 33 . The platen roller 32 is provided with a bearing such as a ball bearing, and even when the recording paper 21 comes into sliding contact with the recording paper 21, the recording paper 2
It is designed so that it does not become a burden on the transportation of item 1.

A thermal head 34 is arranged at a position facing this platen roller 32. That is, a "<"-shaped head plate 35 is provided below the platen roller 32 at the bottom of the casing 40 so as to be swingable about a pivot 36, and the head plate 35 faces the platen roller 32. A thermal head 34 is attached to one side. Head lever 3 rotating around a pivot 37
8 and the ends of the head plates 1 and 35 are connected by a connecting member 39, and as the head lever 38 rotates, the head plate 35 swings to move the thermal head 34 toward the platen roller 32. or separated from the platen roller 32. As the thermal head 34,
A line-type thermal head in which a large number of heating elements are arranged in a direction perpendicular to the conveying direction of the recording paper 21 is employed.

An ink sheet 41 is disposed between the thermal head 34 and the platen roller 32. The ink sheet 41 is wound around the two bobbins 43 and 44 of the ink cassette 42, with the exposed portion between the two bobbins 43 and 44.

The movement of the thermal head 34 causes the platen roller 32 to
It is now under pressure. The ink sheet 41 has three colored ink bands of yellow, magenta and cyan on the recording paper 2.
The ink sheet 41 is sequentially and cyclically applied in the traveling direction of the ink sheet 41 in a size based on the size of the ink sheet 41 .

A capstan 45 is rotatably disposed above the platen roller 32. The capstan 45 is driven by a pulse motor (not shown) or the like and rotates at a constant pitch. Note that the capstan 45 has a relatively rough surface to increase friction with the back surface of the recording surface of the recording paper 21, thereby preventing the recording paper 21 from shifting and color misregistration. .

A pinch roller 46 is disposed at a position facing the capstan 45 so as to be swingable about a support shaft 47 . The pinch roller 46 has a cylindrical shape whose outer periphery is made of an elastic material, and is rotatable about a shaft 48 . The pinch roller 46 is provided with a bearing such as a ball bearing, so that even if the recording paper 21 comes into sliding contact with the pinch roller 46, it does not impose a load on the conveyance of the recording paper 21. pinch roller 4
When feeding the recording paper 21, the capstan 45 swings around a support shaft 47 by a DC motor (not shown) or the like.
The recording paper 21, which is transported upward by the paper feed guide 29 or the like, is passed between the capstan 45 and the capstan 45.

In addition, when conveying the recording paper 21, the pinch roller 46 swings around a support shaft 47 and moves in the direction of the rotation axis of the capstan 45, and presses the recording paper 21 between it and the capstan 45. It is supposed to be done. The recording paper 21 is held and conveyed by the capstan 45 and the pinch roller 46 to prevent color misregistration.

Disposed above the pinch roller 46 and above the capstan 45 are paper discharge guides 49 and 50 that guide the recording paper 21 toward the paper discharge case 23 . The paper ejection guide 49 is
In the vicinity of the pinch roller 46, it faces obliquely upward toward the paper ejection case 23, and is bent at the upper part of the housing 40 to become approximately horizontal. On the other hand, the paper ejection guide 50 has a bent portion 51 above the capstan 45 and is parallel to the guide 49 at the top of the housing 40 . The recording paper 21 on which printing has been completed is guided by these paper ejection guides 49 and 50, is applied between the paper ejection rollers 52, and is fed into the paper ejection case 23 by the rotation of the paper ejection rollers 52. There is.

Note that the paper ejection roller 52 is configured to rotate at the same speed as the capstan 45, and is configured to rotate in forward and reverse directions depending on recording, return, and the like.

Furthermore, in this embodiment, in order to sufficiently increase the pressing force between the pinch roller 46 and the capstan 45 and obtain good registration, a pinch roller that drives the pinch roller 46 in the direction of the rotation axis of the capstan 45 is used. A roller drive means 53 (partially omitted in FIG. 1) is provided.

FIG. 2 is a front view showing a specific configuration of the pinch roller drive means 53, and FIG. 3 is a perspective view of the main parts thereof. Further, FIG. 4 is an exploded perspective view showing a portion near the pinch lever 60.

In FIGS. 2 and 3, a shaft 48 is attached to an opening provided at one end of a pair of "<"-shaped pinch levers 60, and the pinch roller 46 rotates around this shaft 48. It is set up so that it can move freely. A support shaft 47 is fixed to the casing 40 , and the pinch lever 60 has a "<"-shaped central portion pivotally attached to the support shaft 47 and is swingable around the support shaft 47 . A shaft 61 is attached to the other end of the pinch lever 60.
is implanted, and links 62 and 63 are attached to the shaft 61.

As shown in FIG. 4, the plate-shaped link 62 has an elongated hole 62a at one end on the shaft 61 side and a round hole 62b at the other end. Also, the link 63 on the plate has a round hole 6 at one end on the shaft 61 side.
3b, and has a long hole 63a at the other end. The links 62 and 63 have spring hooks 64 on the elongated holes 62a and 63a sides, respectively.
．． 65. A spring 68 is engaged with these spring hooks 6465. Spring 68 biases spring latches 64, 65 toward each other. axis 6
1 to the round hole 63b of the link 63 and the elongated hole 62 of the link 62.
Involve a. The link 62 has an elongated hole 62a with respect to the shaft 61.
It is possible to slide the length of the back. On the other hand, the long hole 63 of the link 63
a and the round hole 62b of the link 62 have the shaft 6 of the shaft 66.
7 is involved. The link 63 has an elongated hole 63 relative to the shaft 67.
It is possible to slide the length a.

A plate 69 is rotatably provided at the center of the shaft 66 and penetrated by the shaft 66. The plate 69 is pivotally attached to a support shaft 70 fixed to the housing 40.
It can be freely swung around the center. A mounting member 71 is fixed to one end of the plate 69, and in plan view, the mounting member 71
The link 73 in the vicinity of the shaft 66 (axis 67)
are engaged by a shaft 72 (see FIG. 2).

As shown in FIG. 2, when the pinch roller 46 is spaced apart from the capstan 45, the link 6263 and the plate 69 are set to be connected by the shaft 66 in a "<" shape. Further, as will be described later, when the pinch roller 46 is pressed against the capstan 45, the support shaft 70 and the shafts 67, 61 are approximately linear, that is, the links 62, 63 and the plate 69 are approximately linear. It is configured so that In other words, the links 62, 63, the plate 69, and the link 73 constitute a toggle mechanism, and the link 73 moves upward and the links 62, 63 and the plate 69 become substantially straight, so that the support shaft 70 and the shaft A large force is generated in the direction of 61.

A spring 74 is disposed on the spindle 47, one end of which is fixed to the pinch lever 60, and the other end of which is fixed to the housing 40. rotation, that is, biasing the pinch roller 46 in a direction away from the capstan 45.

When the link 73 does not act on the plate 69, the spring 74 causes the pinch roller 46 to move away from the capstan 45.

The link 73 is rotatably connected to a cam lever 76 by a shaft 75. The cam lever 76 is pivotally attached to a support shaft 77 fixed to the housing 40 and is rotatable about the support shaft 77. A roller 79 that is rotatable about a roller shaft 78 is provided at the end of the cam lever 76 facing the shaft 75 . A cam 80 is disposed opposite to this roller 79 so as to be rotatable about a shaft 81 . The cam 80 is configured to rotate in the A direction, and presses the roller 79 with its cam surface for a predetermined period of time depending on the operating mode. Note that by making the roller 79 rotatable about the roller shaft 78, the load on the cam 80 is reduced.

Next, the operation of the color printing apparatus configured as described above will be explained with reference to FIGS. 5 to 10. Fifth
7, 9 and 10 are partially sectional front views of the recording unit 24, and FIGS. 5 and 6 show the state when feeding paper,
FIG. 7 shows the start of recording, FIG. 9 shows the time of recording, and FIG. 10 shows the time of return. Further, FIG. 8 is a front view showing the pinch roller driving means 53.

When the recording paper 21 starts to be fed, the lever 27 at the bottom of the paper feed case 22 rotates upward and enters the inside of the case 22 from the bottom of the paper feed case 22. As a result, the recording paper 21 is moved to the paper feed roller 25. The sheet is pressed by the paper feed roller 25 and sent out from the opening 26 by rotation of the paper feed roller 25. As shown in FIG. 5, the recording paper 21 fed from the paper feed case 22 is guided by the slope of the return guide 28, and is conveyed between the paper feed guide 29 and the switching guide 31, and moves approximately horizontally. Further, the recording paper 21 is turned diagonally upward by a paper feed guide 29 and advances.

On the other hand, the rotation of the head lever 38 moves the thermal head 34 to the vicinity of the platen roller 32.

By moving the thermal head 34, the Inksee I.41
is pressed and unrolled. The recording paper 21 guided by the paper feed guide 29 and the switching guide 31 advances between the thermal head 34 and the ink sheet 41.

After the recording paper 21 contacts the ink sheet 41, it slides on the surface of the ink sheet 41, and is guided upward while slidingly contacting the platen roller 32. In this case, as shown in FIG. They are sufficiently spaced apart. The recording paper 21 is guided between a capstan 45 and a pinch roller 46, as shown in FIG. When the leading edge of the recording paper 21 reaches a predetermined position, the pinch roller driving means 53 is in the state shown in FIG.

That is, the roller 79 is sufficiently pressed by the cam surface of the cam 80. Then, the cam lever 76 rotates in the direction B about the support shaft 77, and moves the link 73 upward. As the link 73 moves, the plate 69 is pressed through the shaft 72, and the plate 69 is pressed against the support shaft 70.
Rotate around the center. The shaft 66 also rotates around the support shaft 70. As a result, link 6263 and plate 6
9 gradually becomes smaller, and the shaft 61 and the link 6
2.63 and the shaft 61, the pinch lever 60 is rotationally driven. That is, against the force of the spring 74, the pinch lever 60 rotates to the left about the support shaft 47 toward the plane of the drawing.
The pinch roller 46 moves in the direction of the rotation axis of the capstan 45.

Here, the biasing force of the spring 68 provided on the spring hook 64.65 of the link 62.63 is stronger than the biasing force of the spring 74, and until the pinch roller 46 comes into contact with the capstan 45, the 62, 63 are biased by a spring 68 so that the shafts 61, 67 are located at the ends of the elongated holes 62a, 63a. When the pinch roller 46 comes into contact with the capstan 45, the rotation of the pinch lever 60 is stopped.

When the link 62 is further pressed by the shaft 67 engaged in the round hole 62b, the link 62 is guided by the shaft 61 engaged in the elongated hole 62a and slides. On the other hand, the link 63 is stopped at the same time as the pinch lever 60 by the round hole 63b. As the link 62 moves, the biasing force of the spring 68 against the link 63 in the direction of the shaft 61 increases, and the pinch roller 46
The pressing force on the capstan 45 increases.

In this way, the recording paper 21 is held between the pinch roller 46 and the capstan 46. Next, as shown in FIG. 7, the capstan 45 rotates in the opposite direction to return the recording paper 21 by a certain amount to the supply side, thereby performing cueing to the print start position.

When the recording paper 21 reaches the print start position, the capstan 45 stops rotating. Next, as shown in FIG. 9, the head lever 38 is further rotated to release the thermal head 3.
4 is pressed onto the platen roller 32 via the ink sheet 41 and the recording paper 21. Next, the capstan 45 rotates forward, and the thermal head 34 is energized to start printing.

As the capstan 45 rotates, the recording paper 21 and the ink sheet 41 advance, and the ink applied to the ink sheet 41 is transferred and printed onto the recording paper 21 by the heat of the thermal head 34 according to the video signal. .

The recording paper 21 is conveyed as the capstan 45 rotates, and is guided by paper discharge guides 49 and 50 to advance. Note that the broken lines in FIG. 9 indicate the progress of the recording paper 21 as it is guided by the four paper discharge guides 49 and 50.
is guided between the paper discharge rollers 52 and advances.

Printing is performed by thermally transferring several colors of ink one color at a time. When the printing of the first color is completed, the return mode is entered, and as shown in FIG. 10, the thermal head 34
is separated from the platen roller 32, and the capstan 45 rotates in the opposite direction. Further, the switching guide 31 is swung by a mode motor (not shown) or the like, and the leading end side thereof is moved below the paper feed guide 29. When the printing of the first color is completed, the end of the recording paper 21 is held by the paper feed guide 29, and the recording paper 21 is reversely transported by the transporting force of the capstan 45 and passed between the switching guide 31 and the return guide 30. and is guided above the return guide 28. thus,
The advance of the recording paper 21 is facilitated, and paper jams are prevented from occurring. Thereafter, the second and third colors are printed by similar operations.

When printing is completed, the recording paper 21 is conveyed by a paper discharge roller 52 and sent into a paper discharge case 23.

Further, in this case, the recording section 24 returns to the same state as in FIG. 5. That is, the cam 80 of the pinch roller driving means 53 rotates further, and the roller 79 is no longer pressed by the cam surface. The pinch lever 60 is rotated by the biasing force of the spring 74, and the pinch roller 46 is rotated by the biasing force of the spring 74.
distance from. Further, the thermal head 34 is separated from the platen roller 32, and the tip of the switching guide 31 moves upward. In this way, the next recording paper 21 can be fed.

In this way, in this embodiment, the recording paper 21 is placed in the housing 4.
The paper ejection case 23 is pulled out from the paper feed case 22 arranged at the lower part of the paper feed case 22, changed direction by the paper feed guide 29 and paper ejection guide 49, 50, and arranged at the upper part of the paper feed case 22.
The device is configured to be fed into the body, allowing the overall length of the device to be shortened. In addition, the capstan 45 and the pinch roller 46 are designed to pinch and convey the recording paper.
To prevent color misregistration, there is no need to wrap the recording paper around the platen roller, and the apparatus can be made more compact. Furthermore, the pinch roller driving means 53 employs a toggle mechanism and utilizes the biasing force of the spring 68 to drive the pinch roller 4.
6 is crimped onto the capstan 45, and unlike the conventional method, good registration is obtained without requiring a large space.

[Effects of the Invention] As explained above, according to the present invention, the device can be downsized without causing color misregistration.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of a color printing apparatus according to the present invention, and FIG. 2 is a pinch roller driving means 5.
3 is a perspective view of the main part of FIG. 2, FIG. 4 is an exploded perspective view showing the vicinity of the pinch lever 60, FIGS. 5 to 7, and 9. 10 and 10 are partially sectional front views for explaining the operation of the embodiment, FIG. 8 is a front view without the pinch roller driving means 53, and FIGS. 11 and 12 are views of a conventional color printing apparatus. FIG. 21... Recording paper, 22... Paper feed case, 23...
Paper ejection case, 28.30...Return guide, 29.
...Paper feed guide, 31...Switching guide, 45...Capstan, 46...Pinch roller, 49, 50...
- Paper discharge guide, 53...pinch roller drive means. 2 7 Figure 9 Figure 5 r Figure 8 Figure 10 Figure 11 Figure 12

Claims (1)

[Scope of Claims] A paper feed case for storing recording paper, a paper ejection case for storing the recording paper after recording, a pinch roller and a capstan for transporting the recording paper in forward and reverse directions, and the supply case. a recording paper feeding means for feeding the recording paper from the paper case; a paper feed guide for guiding the recording paper fed from the paper feeding case between the pinch roller and the capstan; and the pinch roller and the capstan. a paper discharge guide that guides the recording paper conveyed by the stun to the paper discharge case; and a pinch that rotatably supports the pinch roller and swings about a support shaft to move the pinch roller toward the capstan. a lever; a first link having one end locked to a pin provided on the pinch lever and having a guide portion at the other end; and a first link for engaging with the guide portion of the first link to swing the pinch lever. a shaft that generates a pressing force; a second link whose one end is locked to the shaft and whose pin of the pinch lever engages with a guide portion provided at the other end; and the first and second links. 1. A color printing apparatus, comprising: a spring that is locked to opposing ends and transmits a pressing force of the shaft against the second link to the first link.