JPS59217564A - Paper folding control method - Google Patents

Abstract

PURPOSE:To fold continuous printing paper accurately by operating a swing fin smoothly with correspondence to the paper feeding amount. CONSTITUTION:Upon occurrence of a paper feed pulse, said pulse is multiplied by (n) and if said value is integer times of the paper length, a swing fin 6 is operated by one step to control such that the swing fin 6 will reciprocate by half through N steps, thereby the swing fin 6 can be operated smoothly with correspondence to the paper 1 feed resulting in accurate folding of the paper 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control method for a swing fin type paper folding device that folds continuous printing paper alternately from front to back.

In printing devices connected to electronic computers, continuous folding paper is generally used as a printing medium. A paper folding device is a device that refolds paper printed by a printing device.

Various methods have been proposed for folding paper.
Among them is a swing fin type paper folding device.

As is well known in the swing fin type paper folding device, the swing fin moves back and forth once every two pages of continuous folding paper to fold the paper.

The conventional control method will be described below. The folded length of the paper is L inches, the paper feed pulse generated every time the paper is fed 1 inch is P1, the paper feed pulse is counted as q pulses, the swing fin is driven one step, and the swing fin is moved N (N is one step). Step by step! If we make a round trip, LP=qN・・・・・・・・・・・・・・・
・・・・・・(Summer) Control is performed so that the relationship is maintained. That is, the swing fins are controlled by paper feed pulses generated during paper feed operation.

On the other hand, the paper used in laser printers generally has a folded length of 7 to 12 inches/inch, and a paper feed pulse generation rate P of 2 pulses/inch is often used. P=2
When substituted into equation (1) as follows, N=2L/q. Since L is variable from 7 to 12, controlling by taking the least common multiple of these would result in a huge value, so control is made so that N=2, that is, the swing fin moves one step when the paper is fed 1/2 page. are doing. When such control is performed, the swing fin moves 1/2 back and forth in two steps, which has the disadvantage that the paper moves due to the transient movement of the swing fin, making it impossible to fold the paper accurately.

SUMMARY OF THE INVENTION The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to allow paper to be folded accurately.

・i The present invention focuses on the fact that paper can be folded accurately by moving the swing fins smoothly in accordance with the paper feed amount, and when a paper feed pulse is generated, this pulse is multiplied by 1, and this value is an integral multiple of the paper length. When this occurs, the swing fin is moved by one step, and the swing fin is controlled to perform 1/2 reciprocation in N steps.

FIG. 1 is a schematic diagram of a laser printer. An image formed on the photosensitive drum 3 by an exposing means, a developing means, etc. (not shown) is transferred onto the paper 1 at a transfer point, that is, a printing position P. The paper 1 is sent by a pair of tractors 2 (12), further sent to a swing fin 6 by rollers 4 and 5 (15), folded alternately front and back by the swing fin 6, and deposited on a table 7.

n=12. When explained assuming that N=24, the above formula (1)%
The formula is %. In other words, when one paper feed pulse occurs, this is multiplied by 12. When this value becomes the paper length (L), the swing fin 6 is moved one step.

In other words, when the paper 1 is fed one page, the swing fin 6 is fed two pages.
It will operate in 4 steps.

FIG. 2 is a circuit diagram showing these control methods according to the present invention. The HIP signal is a 1/2
The paper feed signal in units of inches and paper length information are signals representing one length of paper.

When the HIP signal is generated, the oscillation control section 21 multiplies this pulse by 12 and inputs the result to the counter 22. The output of the counter 22 is compared with the paper length information in a counting control section 23,
When the count value matches the paper length information, the motor control unit 2
4. The swing fin driving motor 26 is operated one step via the amplifier 25 and the counter 22 is reset at the same time.

In the above example, n=12. As explained above, N=24, but the paper length is not an integral multiple of 7 to 12 inches, but 0.
In the case of units of 5 inches, it is also possible to control as n-24 or N=12. Also, if you want the swing fin to move more smoothly and in an analog manner, use n, H.
It is better to increase the value of .

According to the present invention, since the swing fins can be smoothly operated in accordance with paper feeding, the paper can be folded accurately and reliably.

[Brief explanation of the drawing]

Figure 1 is a side view showing the schematic configuration of the folding device;
The figure is a block diagram showing one embodiment of a control section that implements the control method of the present invention. In the figure, 1 is paper, 2 (12) is a tractor, 3 is a photosensitive drum, 4°5 (15) is a roller, and 6
is a swing fin, 7 is a table, 21 is an oscillation control unit,
22 is a counter, 23 is a counting control section, 24 is an Fi monitor control section, 25 is an amplifier, 26 is a motor, and 27 is an encoder. Name of patent applicant Hitachi Koki Co., Ltd. Figure 1 + Figure 2

Claims (1)

[Claims] A swing fin that moves back and forth every two pages of paper to alternately fold the paper front and back, a motor that drives the swing fin, and a control device that controls the motor; The swing fin type paper folding device operates in response to a paper feed signal to fold paper, and when the paper feed signal from the printing device is multiplied by 1 and this value becomes an integral multiple of the paper length, the swing fin folds the paper. It takes N to operate 1/2 forward.
A paper folding control method characterized in that the paper folding is controlled to operate in steps.