JPS6189877A - Paper feeder - Google Patents

Abstract

PURPOSE:To prevent a paper from being staggered or wrinkled, by providing a mechanism for switching between a condition wherein a paper is formly pressed against a capstan by a pinch roller and a condition wherein the pinch roller is lightly pressed in such a degree as to bring the paper into contact with the capstan. CONSTITUTION:When setting a paper, a lever 15 is raised up to a position where it makes contact with a stopper 16, whereby the lever 15 is pressed against the stopper 16 by a spring 14, and the pinch roller 5 is held with a gap between it and the capstan 4. When the lever 15 is moved to the side opposite to the stopper 16, the pinch roller 5 is pressed against the capstan 4 by the load of the spring due to eccentricity of an eccentric shaft 6. When printing, the shaft 6 is rotated by a rotary solenoid in the direction for pressing the pinch roller 5 against the capstan 4, whereby the paper 2 is firmly pressed against the capstan 4 by flexure of rubber in an amount corresponding to the eccentricity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application] The present invention relates to a paper feeding device, such as a line printer or a hard copy, which feeds continuous paper using Masano rollers.

[Traditional technical hat]

Conventionally, line printers, hard copies, and other devices that use the massacrylic method to feed paper require a pinch roller load, especially those that require feeding accuracy or that require reproduction accuracy for colorization. Efforts have been made to increase the stiffness and minimize the slippage between the paper and the capstan by making the capstan larger or by attaching minute particles to the capstan to make the surface rougher. .

[Problem that the invention seeks to solve]

However, when the slippage between the capstan and the paper is eliminated as described above, it is difficult to absorb the cylindrical nature of the capstan, uneven paper thickness, wire drawing due to humidity, or slight distortion when setting the paper. When paper, such as roll paper, is continuously fed, these errors accumulate and tend to develop into meandering, wrinkles, etc., which is a drawback.

Therefore, in order to solve these conventional drawbacks, this invention has developed a fl (feeding system) that is less likely to cause meandering or wrinkles without increasing the processing conditions or increasing the operational precautions. The purpose is to obtain.

[Failure to solve the problem]

In order to solve the above-mentioned problem, this invention has a mechanism that switches between two states: a state in which the paper is strongly pressed against the capstan by the pinch roller, and a state in which the pinch roller is unnecessarily pressed to the extent that the paper touches the capstan. , to prevent paper meandering and wrinkles.

[For production]

With the above mechanism, the paper is fed during recording with the pinch roller's strong pressing force, and the paper feeding between screens is switched to the pinch roller's weak pressing force, and then again with the pinch roller's pressing force. Return to the strong state and feed the paper during recording. This allows the paper to be fed without any slippage between the capstan and the paper, and prevents the accumulation of distortion in the paper due to the precision of the capstan or uneven thickness of the paper. Even if the distortion is amplified, the stiffness weakens each time one screen is printed, and the paper will partially slip on the distorted part, so it is possible to prevent the distortion from accumulating. This prevents the paper from bending and becoming wrinkled the next time it is tightly pinched, or from being pinched diagonally, or from being misaligned and causing an error in the length of the paper feed. This allows stable paper feeding over the entire length of the roll paper without meandering or wrinkles.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows an example of a color hard copy using a thermal transfer method. The recording paper 2, which is connected to a motor (not shown) and is wound around a rotatably supported core 1, is given back tension by the motor and about a third of the paper is wound around a rotatably supported platen 5. It is wound around one turn and is sandwiched between a capstan 4 and a pinch roller 5, which are connected to a drive motor (not shown) and rotatably supported at 1111. A capstan 4 has particles attached to its surface to increase the mass coefficient. A pinch roller 5 is rotatably attached to an eccentric shaft 6 by a bearing 7. An ink sheet 9 wound around a rotatably supported core 8 is moved to a platen 3 by a thermal head 11 fixed to a block 10 connected to a vertical drive mechanism (not shown) and a rotatably supported beer 12. It is pressed against the recording paper 2 at the top and wound around a core 13 that is rotatably supported and connected to a motor (not shown). The three primary colors of yellow (7), magenta (black), and cyan (q) are alternately painted on the ink sheet 9 for one screen each. Figure 2
2 shows the state ii of the pinch roller 5 during operation. When the lever 15 attached to the eccentric shaft 6 is applied to the stopper 16, the spring 14 causes the lever 15 to be attached to the eccentric shaft 6 to the stopper 1.
A load is applied to rotate the lever 15 in the direction of pressing it, and the lever 15 is moved in the opposite direction of the stopper 16! Before the pinch roller 5 comes into contact with the capstan 4, the pinch roller 5 is installed so as to replace the load that causes the eccentric shaft 6 to rotate in the opposite direction. When the paper is first cented, the lever 15 is raised until it reaches the stopper 16 as shown in FIG. 2(a). Then, the lever 15 is pressed against the stopper 16 by the spring 14, and the pinch roller 5 is held with a gap between it and the capstan 4. Next, as shown in FIG. 2(b), when the lever 15 is moved in the opposite direction of the stopper 16, the pinch roller 5 is pressed against the capstan 4 by the load of the spring 14: Figure 2
(As shown in q, the eccentricity +11 + 6 is rotated in the direction in which the pinch roller 5 is pressed against the capstan 4 by a rotary solenoid (not shown), I am afraid to press it. In this state, press the capstan 4 & (more than the recording paper 2).
is driven to wind up the ink sheet 9 while applying printing pulses to the thermal head 11 to print yellow (7) by thermal transfer. When this printing is finished, raise the block 10 and remove the thermal head 11 and ink sheet 9.
From the recording paper 2, return the recording paper 2 to its original position, lower the block 10, and repeat printing magenta (goods) and cyan (C) five times.
b) Obtain benefits. At this time, since there is no slippage between the recording paper 2 and the capstan 4, the five colors are printed with misalignment. After printing one screen, turn off the rotary solenoid, and due to the elasticity of the rubber, the
The pressing force is returned to the weak state shown in 9 to remove the distortion that occurred in the recording paper 2 during printing and prepare it for the next printing. Therefore, printing can be performed over the entire length of the recording paper without accumulating distortion on the paper 2.

〔Effect of the invention〕

As explained above, this invention eliminates paper feeding and meandering between edges without increasing the processing precision of parts, without requiring caution in operation, and without increasing the number of components such as tension rollers. This has the effect of achieving both stable paper feeding without wrinkles.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a main part showing an embodiment of the present invention, )4
FIG. 2 is a cross-sectional view of a main part showing the operation of an embodiment of the present invention. 2... Recording paper 4... Capstan 5... Pinch roller 6... Eccentric shaft 14... Spring 15... Lever and beyond
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Claims (1)

[Claims] In a printer that prints while feeding recording paper between a capstan and a pinch roller, the axis forming the core of the pinch roller is eccentric, and the position of the rotating axis of the pinch roller is adjusted according to the amount of eccentricity of the eccentric shaft, thereby increasing the pressing force against the capstan. A paper feeding device characterized by changing the.