JPS61217457A - Paper feeding method in printing equipment - Google Patents

Abstract

PURPOSE:To eliminate the necessity of alignment of tractor or setting of paper in the tractor when replacing the paper by controlling the rotary speed of rollers split to the right and left through detection of oblique advance of sensor thus preventing the oblique advance. CONSTITUTION:The left edge positions of papers detected through photoreceptors 18 in sensors 20 arranged in front and rear of feed rollers 17 are compared to control the rotary speed of split right/left feed rollers 17 on the basis of the detected amount of oblique advance of paper by means of a circuit 19. When the continuous paper 15 to be fed through the feed rollers 17 is normal, motors M1, M2 will run steadily while upon shifting of paper 15 to the right by 0.1mm, the rotation of motor M1 is increased and upon further shifting in same direction by more than 0.2mm, the rotation of motor M1 is increased while simultaneously the rotation of the motor M2 is dropped thus to correct the oblique advance of paper 15 in short time.

Description

[Detailed Description of the Invention] [Summary] In a printing device that uses continuous paper, a roller divided into left and right parts is used for paper feeding, and a sensor for detecting paper skew is provided. This is a paper feeding method that prevents skewing by controlling the rotational speed of the left and right rollers.

[Industrial application field]

The present invention eliminates the trouble of aligning trackers and setting paper on tractor pins when replacing paper in printing devices that use continuous paper, and further improves the rotational speed of paper feed rollers that are divided into left and right sides. The present invention relates to a paper feeding method in a printing device that controls and prevents skew feeding.

In general, in a printing device (hereinafter referred to as a printer), as shown in FIG. The paper 5 is moved by the tractor pin 4, and a desired print is printed on the paper 5 in synchronization with the rotating printing section 6. Note that 7 is a guide shaft of the tractor, which fixes the tractor 2 in the lateral direction (screws, etc. not shown). 8 indicates a scale for aligning the leading edge of the paper, and 9 indicates a scale for aligning the left edge of the paper.

The above printers are recently used for small systems, display terminals,
It is used in word processors and the like, and the paper size differs depending on the business in which it is generally used, so the paper 5 is replaced for each business.

When replacing paper, the position of the tractor 2 must be adjusted each time according to the width of the paper, and it is also difficult to align the paper feed hole 3 of the paper 5 with the tractor pin 4.

Therefore, there is a need for a method that allows any paper 5 to be easily exchanged and fed.

[Conventional technology]

Paper setting in a conventional printer involves placing a continuous sheet of paper 5 on a paper tray (not shown) at the rear of the printer (see Figure 5), and pulling out the leading edge of the paper through the paper feed hole 3.
is inserted into the tractor pin 4, the tractor 2 is adjusted to the width of the paper 5, the paper reference position is determined using the scale 9, the lid 10 of the tractor 2 is tightened, and the leading position of the paper 5 is adjusted using the scale 8. Paper 5 set on tractor 2
The paper is fed by the rotation of the tractor 2, and the paper travels.

The paper skew during traveling is corrected by the tractor pin 4, and the paper 5 is normally transported.

[Problem that the invention seeks to solve]

For example, there is a recent device as shown in FIG. 6, in which a control device 12 is connected to a host computer 11, and a plurality of televisions 13 and printers 14 are connected to the control device 12, which is both a display terminal and a word processor.

This has a word processing function on the TV side, and you can do online business on the back screen. Therefore, the printer 14 prints text created by a word processor or prints received online data.

In the above apparatus, it is necessary to change the paper 5 suitable for the job to the printer 13. Therefore, the paper has to be replaced frequently, and the position of the tractor 2 must be adjusted each time according to the width of the paper, and it is also difficult to align the paper feed hole 3 of the paper 5 with the tractor pin 4.

The present invention was created in view of these points, and it is a paper feeding method that uses separate left and right rollers to feed paper and eliminates the need for positioning a tractor or setting paper on a tractor pin when replacing paper. is intended to provide.

[Means for solving problems]

FIG. 1 is a diagram illustrating the present invention in detail.

In Fig. 1, reference numeral 15 indicates continuous paper, 16.17 indicates a guide roller and a feed roller that sandwich the continuous paper 15 and feed the paper.
A motor M is connected to each feed roller 17 so that they can be fed separately.

Sensors consisting of a light receiving element 18 and a light emitting element (not shown) are provided in front and behind the guide roller 16 and the feed roller 17, respectively, to detect the skew of the paper.

The sensor position is centered on the left edge of the paper (the position that normally matches the reference plane), and a plurality of light receiving elements 18 are arranged on the left and right sides.

The left and right feed rollers 1 detect the paper skew based on the signals of the two light receiving elements 18, and are divided according to the detected paper skew amount.
A circuit 19 is provided for controlling the rotation speed of 7.

Based on the amount of paper skew detected by the light receiving element 18 of the sensor, the amount of rotation of the left and right motors is controlled to correct the paper skew and run.

[Effect]

That is, the light receiving elements (photodiodes) 18 provided before and after the divided paper feed rollers (guide roller 16 and feed roller 17) check the position of the left edge of each paper, and the skew detection circuit 19 detects the position of the paper 15. Detect the amount of skew.

The amount of rotation of the left and right motors M is controlled based on the detected amount of paper skew to correct the paper skew.

Note that for devices with a high paper feed speed or devices with a short distance from the paper hopper to the paper feed roller 17, the position of the hopper stand 21 is also adjusted to prevent the paper 15 from being skewed.

In the present invention, skew is prevented by controlling the rotational speed of the left and right divided paper feed rollers 17 depending on the amount of paper skew. In addition, paper can be fed by simply inserting any paper into the rollers.

〔Example〕

FIG. 2 is a diagram explaining the present invention in detail.

Note that common symbols throughout the plan indicate the same objects.

Fig. 2 shows the paper feed of the printer, 15 indicates continuous paper, rollers are used to feed the paper, a guide roller 16 and a feed roller 17 are provided with the continuous paper 15 in between, and the guide roller 16 and Divide the feed roller 17 into two parts, left and right,
Motors M1 and M2 are connected to each feed roller 17 and driven separately.

In order to detect paper skew, light-receiving elements 1 are installed on the paper guides 23 at the front and rear parts of the guide roller 16 and the feed roller 17.
8 and a sensor 20 constituted by a light emitting element are provided, respectively. The sensor 20 position makes it possible to check the position of the left edge of the paper.

The position of the left edge of the paper detected by the light-receiving element 18 of the sensor 20 placed before and after the feed roller 17 is compared to detect the paper skew amount, and the left and right feed rollers 17 are divided by the detected paper skew amount. A circuit 19 is provided to control the rotation speed.

When the continuous paper 15 fed by the feed roller I7 is normal, the motor ML M2 rotates steadily as shown in FIG.
For example, if the paper 15 deviates to the right by 0.1 degrees, the rotation speed of the motor Ml is increased, and when the paper 15 deviates by 0.2 degrees or more in the same direction, the rotation speed between the motors increases. The number of revolutions of the paper 15 is lowered to correct the skew of the paper 15 in a short time.

As in the above embodiment, the rotational speed of the left and right divided feed rollers 17 is controlled according to the amount of skew of the paper 15 to prevent skew, and since the rollers are used for paper feeding, the paper 15
You can feed any paper with a simple set of inserting it into the roller.

Further, if any paper 15 is inserted into the roller, the paper is set, so that automatic loading is possible.

In addition, for devices with a high paper feed speed or devices with a short distance from the paper hopper to the feed roller 17, the position of the hopper stand 21 is adjusted as shown in FIG. 4 so that the paper 15 is pulled out straight. Note that the hopper stand 21 has a structure in which it is moved by engaging with a gear 22 connected to a motor.

〔Effect of the invention〕

As explained above, according to the present invention, the rotation speed of the left and right divided rollers is controlled according to the amount of paper skew to prevent skew, so when replacing paper, it is not necessary to align the tractor as in the past. The hassle of setting paper on a tractor is eliminated.

[Brief explanation of drawings]

Figure 1 is a diagram explaining the present invention in detail, Figure 2 is a diagram explaining the invention in detail, Figure 3 is a diagram explaining skew correction, and Figure 4 is a diagram explaining the hopper position adjustment of the present invention. FIG. 5 is a diagram illustrating paper feeding in a conventional printer, and FIG. 6 is a diagram illustrating a recent device. In the figure, 6 is a printing unit, 15 is a continuous paper sheet, 16 is a guide roller, 17 is a feed roller, 18 is a light receiving element, 19 is a skew detection and motor control circuit, 20 is a sensor, 2I is a hopper stand, and 22 is a gear , Jyo 4 Soq I) Bunriki Takumi I 1 Chigure 6 Shuzi 2 Kenmine 3 Enkoma 4 Shu traditional A゛J〉70ss*') 1 theory 6 Kenmine Srf! *Oto-wo

Claims (1)

[Claims] A paper feeding device for a printing device using continuous paper, in which a roller (17) that contacts the continuous paper and feeds the paper is divided into left and right parts, and the paper travel is guided before and after the roller (17). A sensor (18) is provided on the paper guide (23) that detects the skew of the running paper, and the rotational speed of the left and right divided rollers (17) is controlled based on the amount of paper skew detected by the sensor (18). A paper feeding method in a printing device that is characterized by controlling and preventing skew feeding.