JPH0768872A - Printer device - Google Patents

Abstract

PURPOSE:To reduce color shift which may be caused in the direction of horizontal scanning (direction perpendicular to a drawing direction) when multicolor printing is performed by a clamp-drawing type thermal head. CONSTITUTION:Feed roller 7 having microscopic protrusions and a feed roller 8 are provided in the vicinity of a thermal head 2 which is a printing unit. Both the rollers hold a sheet 6 therebetween and press it, and the sheet 6 is drawn by a clamper 1 and reciprocatingly moved by the number of colors to perform multicolor printing. In this case, the microscopic protrusions of the roller 7 restrict the sheet so that the sheet is not moved in the direction of horizontal scanning, whereby color shift is reduced. The size of the microscopic protrusions is, for example, about 0.06mm in height and about 0.03mm in diameter, and a pitch (interval) of the microscopic protrusions is about 0.3 mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer device, and more particularly to prevention of color misregistration in a color printer.

[0002]

2. Description of the Related Art FIG. 7 is a diagram showing a conventional printer (thermal printer). In the figure, 1 is a clamper, 2 is a thermal head, 3 is a platen roller, 4 is a pinch roller, 5 is an ink sheet, and 6 is an ink sheet. Is paper.

Next, the operation will be described. The paper 6 is held by the platen roller 3 and the pinch roller 4,
The tip is held by the clamper 1 through the thermal head 2. The ink sheet 5 is sandwiched between the paper 6 and the thermal head 2, and the thermal head 2 is attached to the platen roller 3
Ink sheet 5 is heated by pressing it against
Is transferred to the sheet 6.

At this time, the two-dimensional image is transferred onto the sheet 6 by pulling the sheet 6 in the direction of the arrow (sub-scanning direction) in the figure by the clamper 1. There are usually three colors of yellow, magenta, and cyan, or four colors of black, and the paper 6 returns to the printing start position while being held by the clamper 1 every time each color is printed. Some devices hold the paper 6 by the pinch rollers 4 during printing, and some devices release the pinch rollers 4 and do not hold the paper 6.

[0005]

Since the conventional printer device is constructed as described above, since the position of the paper 6 held by the clamper 1 is small, the color misregistration for each color will not occur. Although small, the portion held by the pinch roller 4 does not have a holding force as much as the clamper 1, so there is a problem that the color misregistration in the pulling direction and the vertical direction (main scanning direction) is large.

The present invention has been made in order to solve the above-mentioned problems, and accurately maintains the positioning of the paper surface of the paper 6 away from the clamper in the main scanning direction, resulting in less color misregistration of each color. The purpose of the present invention is to obtain a printer device that can be used.

[0007]

A printer device according to the present invention is a printer device for multicolor printing by a clamp pulling method, which comprises a platen roller and a pinch roller having minute projections, and the platen roller and the pinch roller at the time of printing. The sheet is sandwiched between the roller and the roller, and the sheet is pressed and moved.

Further, in a printer device for multi-color printing by the clamp pulling method, a first roller for transportation and a second roller for transporting are provided in the vicinity of the printing section, and the second roller is provided at the time of printing. The sheet is sandwiched between the first roller and the second roller so that they are pressed against each other and moved.

The range in which the pinch roller or the second roller is provided with the minute projections is within the range in which the sheet is sandwiched and outside the printing area.

[0010]

In the printer apparatus of the present invention, the pinch roller having minute protrusions restricts the degree of freedom in the direction perpendicular to the moving direction of the paper (main scanning direction), so that the paper is accurately positioned and the color misregistration is reduced. To do.

Further, the second roller having the minute protrusions restricts the degree of freedom in the direction perpendicular to the moving direction of the paper (main scanning direction), so that the paper is accurately positioned and the color misregistration is reduced.

If the range in which the minute protrusions of the pinch roller or the second roller are provided is within the range for holding the sheet and outside the printing area, the minute protrusions may damage the printing screen of the sheet. There is no.

[0013]

【Example】

Example 1. Embodiment 1 of the present invention will be described below with reference to FIG. In the figure, 1 is a clamper, 2 is a thermal head, 3 is a platen roller, 4 is a pinch roller having minute projections 4b, 5 is an ink sheet, and 6 is a sheet.

FIG. 2 shows an example of the structure of the minute projections 4b.
As shown in the figure, it is a very small protrusion, and this protrusion is formed by etching a stainless steel roll or by ceramic spraying.

Next, FIG. 3 shows an example of a range in which the minute protrusions 4b are formed. FIG. 3a shows the range of the paper width (the range in which the pinch roller 4 presses the paper while sandwiching it), and the fine protrusions 4b are provided in the fine protrusion zone 4a outside the printing range. With such a zone, there is no possibility that the surface of the paper will be damaged by the minute protrusions 4b.

Since the minute protrusions 4b are on the printing screen side of the paper 6, it is desirable that they are within the width of the paper 6 and outside the printing width. However, as shown in FIG. 3b, the entire circumference of the pinch roller 4 or the entire paper width is used. The microprojection zone 4a may be provided in the. in this case,
It is better to reduce the pressing force to reduce the dents on the paper due to the minute protrusions 4b.

Next, the operation will be described. In FIG. 1, the sheet 6 is held by the clamper 1 and pulled in the arrow direction (sub-scanning direction) in the figure. The other side of the sheet 6 is held by the platen roller 3 and the pinch roller 4. Since the pinch roller 4 has the minute protrusions 4b at both ends, the paper 6 is sent out in the sub-scanning direction, but the positional deviation of the paper 6 in the longitudinal direction of the roller (main scanning direction) is restricted. The color shift in the main scanning direction when printing three or four colors is reduced.

Example 2. In the second embodiment, unlike the first embodiment, the pinch roller is not provided with the minute protrusions, but another roller is provided with the minute protrusions. FIG. 4 shows the embodiment. In the figure, 1 is a clamper, 2 is a thermal head, 3 is a platen roller, 4 is a pinch roller, 5 is an ink sheet,
Reference numeral 6 is a sheet, 7 is a conveying roller having minute protrusions, and 8 is a roller for holding the sheet 6 between itself and the conveying roller 7.

Next, the operation will be described. Clamper 1
A conveyance roller 7 having minute protrusions and a conveyance roller 8 for holding the sheet 6 are provided between the platen roller 3 and the platen roller 3, and the clamper 1 moves in the direction of the arrow in the drawing during printing,
When the sheet is moved away from the platen roller 3, the conveyance rollers 7 and 8 near the platen roller 3 regulate the positional deviation of the sheet 6 in the main scanning direction.

When returning the clamper 1 to the printing start position,
The sheet 6 may be held by the transport rollers 7 and 8, but when returning at high speed, the transport roller 7 is lowered, the transport roller 8 is raised, or the transport roller 7 is lowered and the transport roller 8 is raised. It is more effective to release the paper 6 because wrinkles and jams of the paper 6 (jam: paper jams and operation stop) do not occur.

The conveying roller 7 provided with the minute protrusions is shown in FIG.
Although it may be a micro-projection zone as shown in a and FIG. 3b, it may be provided as a micro-projection zone as shown in FIG.
In FIG. 5a, minute protrusion zones 7a having a width of about 10 mm are provided at three locations on the transport roller 7 to regulate the positional deviation in the main scanning direction, and stable regulation can be performed. Since the transport roller 7 is provided on the back side of the paper 6, there is no risk of damaging the print screen.

In FIG. 5b, the transport roller 7 is connected to the shaft 7b.
And three rollers 7c rotatably provided on the shaft 7b, and a minute projection zone 7a provided on the peripheral surface of the roller 7c. Since the roller 7c does not move in the main scanning direction, it is possible to regulate the positional deviation in the main scanning direction.

If the minute projections are provided on the entire circumference as shown in FIG. 3b, the grip force with respect to the paper 6 is increased, but FIGS. 5a and 5b are used.
In this case, when the sheet 6 is inclined, there is a degree of freedom and a jam is less likely to occur than when the minute protrusions are provided on the entire circumference as shown in FIG. 3b.

Example 3. In the third embodiment, as shown in FIG. 6, the transport rollers 7 and 8 are connected to the platen roller 3 and the pinch roller 4.
It is arranged on the rear side of. In this case, since an extra roller is not placed on the portion to be printed as in the second embodiment, the mechanism of the printing portion does not become complicated.

Example 4. In the case of the second and third embodiments, the positions of the transport rollers 7 and 8 may be reversed. in this case,
Since the minute protrusions come to the print screen side of the paper 6, the minute protrusion zone may be provided in a portion outside the printing range within the width of the paper as shown in FIG. 3a. Further, when there is no fear of scratching the printing screen, the micro-projection zone shown in FIGS. 3b, 5a, 5b or the like can be used.

Even if both of the transport rollers 7 and 8 do not actively rotate, one roller may actively rotate and the other roller may passively rotate. Good. Alternatively, both may be passively rotated.

[0027]

As described above, according to the present invention, since the pinch roller or the second roller is provided with the minute protrusions and the sheet is held by the minute protrusions, the position of the sheet in the main scanning direction is determined. The misregistration is reduced, and the color misregistration at the time of multicolor printing is reduced.

Further, since the range in which the pinch roller or the second roller is provided with the minute protrusions is within the range for holding the sheet and outside the printing area, the minute protrusions damage the printing screen of the sheet. There is no fear.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of the minute protrusion of FIG.

FIG. 3 is a diagram showing a range in which a minute protrusion of FIG. 1 is provided.

FIG. 4 is a configuration diagram of a main part of a printer device according to a second embodiment of the present invention.

5 is a diagram showing a range in which the minute protrusions of FIG. 4 are provided.

FIG. 6 is a configuration diagram of a main part of a printer device according to a third embodiment of the present invention.

FIG. 7 is a configuration diagram of a main part of a conventional printer device.

[Explanation of symbols]

 1 Clamper 2 Thermal Head 3 Platen Roller 4 Pinch Roller 4a Micro Projection Zone 4b Micro Projection 5 Ink Sheet 6 Paper 7 Transport Roller (with Micro Projection) 7a Micro Projection Zone 7b Shaft 7c Roller 8 Transport Roller

Claims (3)

[Claims] 1. A printer device for multi-color printing by a clamp pulling method, comprising a platen roller and a pinch roller having minute protrusions, and nipping a sheet between the platen roller and the pinch roller during printing, Also, a printer device characterized by being moved. 2. A printer device for multicolor printing by a clamp pulling method, comprising: a first roller for transportation and a second roller for transporting and having a minute protrusion in the vicinity of the printing section,
A printer device characterized in that a sheet of paper is sandwiched between the first and second rollers during printing, and is pressed and moved. 3. The range according to claim 1 or 2, wherein the pinch roller or the second roller is provided with the minute projections within a range in which the sheet is sandwiched and outside the printing area. Characteristic printer device.