JPS61205158A - Multi-color image former - Google Patents

Abstract

PURPOSE:To prevent the deviation of printing by a method in which an adhesive fixer is provided to a platen roller, and a part of transfer paper is bonded to the fixer and wound around the platen roller. CONSTITUTION:A transfer paper 16 is placed on a receiving base 47 and pushed into it until its tip reaches a contact plate 18. A lever 20 is turned to the direction of (x), a push plate 21 is pushed down, and the tip of the paper 16 is pressed on a fixer 13 and bonded to an adhesive material 13a. Afterwards, when the lever 20 is separated, it is returned to the opposite direction, the plate 21 is pulled up, and the paper 16 is set. A pulse motor 10 is operated, a platen roller 12 is turned to the direction of (y), and a pulse motor 26 is operated until a disc 42a is detected by a sensor 42b. When the starting position of image formation is detected by a position sensor 41, voltage is applied to the thermal head 24, and an ink ribbon 32 is heated to form yellow image. In this way, images of multi-color inks are lapped to form a color image.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a multicolor image forming apparatus in a printer or the like that forms an image on the same transfer paper or the like using a plurality of color inks.

[Technical background of the invention and its problems]

In thermal transfer printers and the like, in order to obtain a color image on transfer paper, it is generally necessary to perform a plurality of transfer steps for each ink color onto the same transfer paper to polymerize the inks. For this reason, in the past, a conveyance roller paired with a platen roller was provided, and the transfer paper was sandwiched between the two platen rollers and the conveyance roller, and the transfer process was repeated by moving the transfer paper back and forth. Alternatively, a transfer paper is wound around a platen roller, and the platen roller is rotated multiple times in accordance with the number of transfer steps.

However, the former method has disadvantages in that the transfer paper is moved back and forth, which tends to cause printing misalignment, resulting in poor image quality.

Although printing misalignment is less likely to occur, the grip mechanism formed on the platen roller to fix the leading edge of the transfer paper is complicated and expensive, and the transfer paper must be fixed to the platen roller or separated from the platen roller. There is a problem in that the operation becomes complicated and the operability is degraded.

[Object of the Invention] The present invention has been made based on the above circumstances, and it is possible to prevent printing misalignment, simplify the mechanism, facilitate manufacturing, and reduce costs. It is an object of the present invention to provide a multicolor image forming apparatus that can be easily fixed to or separated from a platen roller and that can improve operability.

[Summary of the invention]

In order to achieve the above object, the present invention prevents misalignment of printing by, for example, providing a platen roller with an adhesive fixing part, pasting a part of the transfer paper on the fixing part, and then wrapping it around the platen roller. be.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. At the printing position of a printer (not shown), a platen roller (12) with a diameter of about 50 [■] rotated by a first pulse motor (10) via a first belt (11) is attached to a concave fixed part ( 13), the receiver is the image forming medium fed from the stand (14) [A.6]
A rubber-based adhesive member (13a) is applied to adhesively fix the transfer paper (16) of the same size to the platen roller (12), and the transfer paper (16) is placed on the upper tip of the stand (14).
A pressing member (17) is provided for adhering the fixing portion (13) to the fixing portion (13). This pressing member (17) is
is guided by the guide plate (15). It has a contact plate (18) for positioning the transfer paper (16) and a pressing plate (21) that is brought into contact with the lever (20) and pressed down toward the platen roller (12). Note that (22) is a spring that returns the lever (20), (23) is a spring that returns the pressing plate (21), and the other ends are respectively attached to the inner wall of the main body (not shown). (24) is also driven by a cam (31) attached to a shaft (30) that is rotated by a second pulse motor (26) via a second belt (27) and a first pulley (28). There is a thermal head that is biased on the platen roller (12) side, and a ceramic substrate (
Brace (24b) on top of 24a), fever hypoantibody (24
c) is layered, and furthermore, an electrode lead (24d) is connected to the low fever antibody (24c), and a protective film (24e) is layered on top of the electrode lead (24d).
) is coated. Furthermore, (25) is a thermal head (2
4) is a spring that separates the platen roller (12) from the platen roller (12). Furthermore, (32) is yellow (32a), magenta (32b), cyan (32c) on a substrate (not shown).
) is an ink ribbon that is repeatedly coated with heat-melting ink, and includes a second pulley (33) and a third belt (34) attached to the other end of the shaft (30).
The winding reel (36) has a disc brake structure and is partially wound up with torque. The ink ribbon (32) is moved between the platen roller (12) and the thermal head (24) by guide shafts (38a) and (38b) supported by a support (37) attached to the end of the thermal head (24).
) is inserted between. Further, (40) is a first sensor that detects the type of ink. Note that (39) is a paper sensor that detects the presence or absence of transfer paper, and (41) is a position detection device for the platen roller (12).
) is attached to the shaft (12a) and has a notch formed therein.
It consists of a disc (41a) and a second sensor (41b) that detects this notch, and (42) is a cam (3).
This is the position detection device 1), which is composed of a second disk (42Ll) connected to the shaft (30) and having a notch formed therein, and a third sensor (42b) that detects this notch. Furthermore, (43a) and (43b) are transfer paper (
16) is a guide plate for winding the platen roller (12).

To start image formation, in order to set the transfer paper (16) on the platen roller (12), the operator first places the transfer paper (16) on the tray (47),
Roll the transfer paper (16) until the tip touches the contact plate (18).
) to determine the position of the tip, then push in the spring (2
2) by rotating the lever (20) in the direction of arrow X and pressing down the pressing plate (21), the tip of the transfer paper (16) is pressed against the fixed part (13) and the adhesive member (1, 3a ). After this, when the operator releases the lever (20),
The springs (22) and (23) cause the lever (20
) is rotated back in the direction opposite to the arrow X direction, and the press plate (
21) is pulled upward, and the transfer paper (16) is set in a printable state. Next, when image formation is started and a start signal is generated, the first pulse motor (10)
is driven, the platen roller (12) is rotated in the direction of arrow X, and then the third sensor (42b) detects the second
The position where the disk (42a) is detected, that is, the position where the cam (3
1) causes the thermal head (24) to move the ink ribbon (3
2), the pulse motor (26) of the position articulation 2, which is pressed against the platen roller (24), is driven.

At this time, the ink ribbon (32) is also attached to the take-up reel (36).
Yellow (32a) ink is inserted between the platen roller (12) and the thermal head (24). After this, when the position detection device (41) detects the image forming start position of the platen roller (12),
A print start signal is generated, and according to the image forming signal, a voltage is applied to the thermal head (24), the ink ribbon (32) is heated, and an image with yellow (32a) ink is formed on the transfer paper (16). Ru.

Then, when image formation for one line is completed, the second pulse motor (26) is driven again, and while the thermal head (24) is once separated from the platen roller (12) by the cam (31), the ink ribbon is removed. The process of (32) being rolled up by - lines is repeated. When printing with the yellow (32a) ink is completed in this way, the second pulse motor (26) is activated by the first sensor (40) to move the platen roller (12) and the thermal head (2).
4) Rotate the take-up reel (36) until magenta (32b) ink is inserted between the two to wind up the ink ribbon. Then, the platen roller (I2) rotates once and enters the second rotation, and when a print start signal is generated by the position detection device (41), the yellow (
Transfer paper (32a) on which an image has already been formed with the ink
16) The magenta (32b) ink image is sequentially superimposed on the platen roller (16).
In the third rotation of step 2), cyan (32c) is placed on the transfer paper (16).
) is polymerized to form a color image on the transfer paper (16).

After stopping the pulse motor (10) of the rear section 1, by rotating it in the opposite direction and rotating the platen roller (12) in the direction opposite to the direction of arrow (14) Returned to the top. Finally, the operator tears it off from the fixed part (13).

The transfer paper (16) on which the color image has been formed is removed from the platen roller (12), and image formation is completed.

With this configuration, during color image formation, transfer paper (1
6) will not shift and cause misalignment of one image, and the fixing part (13) 1±-FulluU platen roller (13) for fixing the transfer paper (16) to the platen roller (12).
12) can be formed by simply applying the adhesive member (13a) to the concave portion formed in the grip mechanism, and is much simpler than the conventional grip mechanism, extremely easy to manufacture, and can reduce costs. The transfer paper (16) can be fixed to the platen roller (12) by simply pressing it with the pressure plate (21), and can be removed from the platen roller (12) by simply rotating the platen roller (12) in the opposite direction. This can be done easily, and the operability can be greatly improved.

Note that this invention is not limited to the above embodiments, and can be modified in various ways. For example, the diameter of the platen roller can be changed depending on the required image size, and the material of the adhesive member can also be changed. It is not limited to rubber-based materials as long as the transfer paper can be attached and removed. Further, the structure of the pressing means for adhering the transfer paper to the fixing portion is also arbitrary. In addition, the ink ribbon may be thermally sublimable, and the means for melting or sublimating the ink is not limited to a thermal head, but may be a low-carbon material such as a polymeric plastic containing carbon on the back side of the ink ribbon substrate. An anti-resistance layer may be provided, and the ink may be melted or sublimated by Joule heat generated by applying current to this low-resistance layer using a needle electrode. Furthermore, the image forming method may also be an inkjet method instead of a transfer method.

〔Effect of the invention〕

As explained above, according to the present invention, the image forming medium can be fixed to the platen roller simply by adhering the image forming medium to the fixing portion made of the adhesive member on the platen roller, and the color image is being formed.

A clear color image can be obtained without image misalignment caused by the image forming medium being misaligned.Moreover, the structure of the fixing part is simple, making manufacturing easy and reducing costs.Furthermore, the platen roller It is also easy to fix or release the image forming medium to the image forming medium, and the operability thereof is also improved.

[Brief explanation of drawings]

1 to 5 show one embodiment of the present invention, FIG. 1 is a perspective view thereof, FIG. 2 is a sectional view showing the platen roller, and FIG. 3 is a partially omitted sectional view showing the thermal platen roller. Figure 4 is a time chart showing the time of image formation, Figure 5 is a time chart showing the image formation time.
The figure is a perspective view showing the ink ribbon. DESCRIPTION OF SYMBOLS 10... First pulse motor, 12... Platen roller, 13... Fixed part, 13a...
・Adhesive member, 16... Transfer paper, 17... Pressing member,
24... Thermal head, 26... Second pulse motor, 31... Cam, 32
... Ink ribbon, 36... Take-up reel. Agent Patent Attorney Inoue - Rikitsutsu 2 Figure 3 Figure 5

Claims (1)

[Scope of Claims] 1. A multicolor image is obtained by polymerizing ink of an arbitrary color onto an image forming medium wound around a platen roller each time the platen roller rotates, using an ink adhering means, in which a multicolor image is obtained. A multicolor image forming apparatus, comprising a fixing section for fixing the image forming medium. 2. The multicolor image forming apparatus according to claim 1, wherein the fixing portion is recessed from the peripheral surface of the platen roller. 3. The multicolor image forming medium according to claim 1 or 2, characterized in that the image forming medium is pressed by a movable pressing member provided above the fixing part and adhesively fixed to the fixing part. Image forming device. 4. According to any one of claims 1 to 3, the image forming medium is peeled off from the platen roller by rotating the platen roller in the opposite direction to release the wrapping and then separating the image forming medium from the platen roller. multicolor image forming device. 5. Inks of any plurality of colors are sequentially and repeatedly held on a single ink ribbon, and the color of the ink ribbon attached to the image forming medium is repeated every rotation of the platen roller. A multicolor image forming apparatus according to claim 1. 6. The multicolor image forming apparatus according to claim 5, wherein the ink adhering means is a heating means, and the ink on the ink ribbon is transferred to the image forming medium by heating.