JPS6311269B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a paper folding device that is added to a printing device connected to, for example, a computer.

In printing devices connected to electronic computers,
Continuously folded paper is commonly used as the print medium. A paper folding device is a device that folds again the continuous paper printed by the printing device.

As is well known, in paper folding devices,
By moving the swing fin in accordance with the folding length, the sheet coming out through the swing fin is guided in the direction of the crease, and the sheet is folded.

Conventionally, the following methods have been used to treat the leading edge of paper in such paper folding devices.

One method is to manually process the leading edge of the paper. That is, this is a method in which the paper that comes out through the swing fin is manually guided so that it can be folded properly. This method is extremely inefficient in that it requires manual intervention each time the tip is processed.

Another method is to provide a mechanism within the paper folding device for processing the leading edge of the paper. An example is shown in FIG. The upper surfaces of the belts 3 and 4 are rotating outward, respectively. Assuming that the first fold of the paper 2, that is, the crease between pages 1 and 2, is convex to the right in the figure and the swing fin 1 is at the left end as shown in the figure, the paper 2 that comes out through the swing fin 1 is When the leading edge of the paper 2 reaches the belt 3, the leading edge of the paper 2 is guided by the belt 3 as the paper 2 comes out, and finally reaches the position of the detector 5. At this time, the detector 5 is activated and both belts 3 and 4 stop rotating.

On the other hand, if the first fold is convex to the left in the figure and the swing fin 1 is at the right end,
The leading edge of the paper 2 coming out through the swing fin 1 is placed on the belt 4. As the paper 2 comes out, the leading edge of the paper 2 is guided by the belt 4, and finally reaches the position of the detector 6. At this time, the detector 6 is activated, and both belts 3 and 4 stop rotating. When the detector 5 or 6 is activated, the pendulum motion of the swing fin 1 is started. The pendulum motion of the swing fin 1 is performed so that the swing fin 1 moves one way every time a sheet of paper corresponding to the folded length of the sheet 2 is fed into the paper folding device after the detector 5 or 6 is activated. This method has the drawbacks of complicated structure and high cost.

SUMMARY OF THE INVENTION An object of the present invention is to provide a control device for a paper folding device that eliminates the above-mentioned drawbacks of the prior art and enables paper leading edge processing without providing a complicated paper leading edge processing mechanism and without human intervention. That's true.

Assume that the one-way pendulum motion of the swing fin is performed in S steps regardless of the folded length of the paper, the amount of paper feed signals generated is P pulses/inch, and these pulses are counted as q pulses to move the swing fin in one step. shall proceed. In the steady operation of the swing fin when the paper folding length is L inches, the following relationship must hold: LP=qS...(1). Furthermore, during such steady operation, the best folding characteristics can be obtained if the fold closest to the swing fin of the sheet being ejected from the swing fin is at a distance of A (A<L) from the tip of the swing fin. I understand. Note that the distance A is necessary to ensure that even weak paper can be folded reliably, and is not a very large value.

However, if the swing fin is driven so that the relationship in equation (1) is established from the time when the leading edge of the paper extends beyond the tip of the swing fin by the amount A, the leading edge of the paper will be dragged by the movement of the swing fin. There is a problem that the paper cannot be folded.

Therefore, if the swing fin is not operated until a predetermined amount of paper is ejected from the tip of the swing fin, the tip of the paper can be folded. However, if this is done, the phase of the swing fin and the fold line of the paper will be shifted, making it impossible to fold the paper during normal operation.

The present invention aims to correct the above-mentioned phase shift between the swing fin and the fold line of the paper that occurs due to the processing of the leading edge of the paper, and finally bring the movement of the swing fin into a steady state.

The present invention therefore controls as follows.

The swing fin is not made special until the leading edge of the paper extends beyond the folded length of the paper from the tip of the swing fin.

The leading edge of the paper is from the leading edge of the swing fin (L+
m) From the time when (A<m<L) is output, count the signal related to paper feed by a ₁ pulse (O<a ₁ <q),
Control the swing fin to move one step, and
Advance one step (one way). When you advance to S step,
The fold closest to the swing fin (the first fold) of the paper being ejected from the swing fin
should be at a distance of m+Sa ₁ /P (<L) from the tip of the swing fin.

Furthermore, the signal related to paper feeding is a ₂ pulse (O<a ₂
<q) Count and control the swing fin to move one step, then advance S step (one way).
When the S step advances, the fold closest to the swing fin (the second fold) of the paper being ejected from the swing fin is m+S(a ₁ + a ₂ )/P-L (<L) from the tip of the swing fin. Keep it at a distance.

Thereafter, the control is performed in the same manner, and the signal related to paper feeding is counted as _ao pulses (O< _ao <q), and the swing fin is controlled to move by one step, and is advanced by S steps (one way). When the S step advances, the fold closest to the swing fin (the nth fold) of the paper being ejected from the swing fin is m + (S/P) _o 〓 ⁿ⁼¹ a _o - (n -1) Make sure that the distance is L (<L). After n half-reciprocating movements of the swing fin, the distance from the fold closest to the swing fin (nth fold) of the sheet being discharged from the swing fin to the tip of the swing fin is m+(S/P) _o 〓 ⁿ⁼ If ¹ a _o -(n-1)L is made equal to the distance A, then the swing fin can be driven so that equation (1) is satisfied. In other words, it is possible to move on to folding during normal operation.

Therefore, it is sufficient to set a ₁ , a ₂ , ...a _o and m so that the relationship m+(S/P) _o 〓 ⁿ⁼¹ a _o -(n-1)L=A holds. Become.

If the above (L+m) is the length that allows the leading edge of the paper to reach the end of the table, the paper can be folded without dragging. Note that if you start driving the swing fin when the leading edge of the paper has been pushed out by (L+A) from the tip of the swing fin, the leading edge of the paper has not reached the end of the table, so
Similar to starting the swing fin when the paper is ejected, the leading edge of the paper is dragged, making it impossible to fold the paper.

FIG. 3 is a diagram showing an embodiment of the control device of the present invention. In this embodiment, the number of steps S required for one-way movement of the swing fin 1 is 12, n=2.
It will be explained as follows.

The PLS signal is a signal related to paper feeding described above. That is, P pulse signals are generated every time the paper 2 is fed by 1 inch, and the AND gate 1
1 is input.

The TOPS signal is transmitted when the leading edge of the paper 2 reaches the paper feeding roller 7 and is sent via the lever 8 to the switch 9.
It is a signal whose logic value becomes 1 when the circuit operates, and is applied to the set input terminals of the AND gate 11, inverter 16, triggerable flip-flop (hereinafter referred to as F/F) 17, and the reset input terminals of F/Fs 18 to 20. is input. These F/Fs 17 to 20 form a shift register.

The SFDR signal is a drive signal for moving the swing fin 1 one step through an amplifier, drive motor, etc. (not shown).

The first side output of the F/F 17 is the AND gate 11.
has been entered.

The read-on memory (hereinafter referred to as ROM) 24 stores the number of pulses corresponding to the above (L+m) plus the length Ls of the swing fin 1 (L+m+Ls), that is, the value P(L+m+Ls) for each folded length of the paper 2. I remember. Also, the ROM24
The enable terminal of is connected to the 0 side output terminal of the F/F 17, and becomes operational when the 0 side output has a logical value of 1.

ROM25, 26 and 27 respectively have the above numerical values a ₁ ,
a ₂ and q are stored for each folded length of paper 2. The enable terminals of the ROMs 25 to 27 are connected to the O side output terminals of the F/Fs 18 to 20, respectively, and become operational when the corresponding 0 side output has a logic value of 1. In other words, ROM24-27 is F/F17-
One of the 20 states is selected.

The l ₁ , l ₂ , l ₃ , and l ₄ signals are signals indicating the folded length of the paper 2, and indicate the addresses of the ROMs 24 to 27, and each memory value a ₁ corresponding to the folded length of the paper 2 is , a ₂ and q are selectively read out. For example, if the folded length is 8 inches, l ₁ = 0, l ₂ = 0, l ₃ = 0, l ₄ = 0, and if the folded length is 9 inches, l ₁ = 1, l ₂ = 0, l. ₃ =
0, l ₄ =0. In the swing-fin type paper folding device, since it is necessary to set the paper folding length, this signal can be easily obtained from the setting section.

The PLS input via the AND gate 11
The count value of the counter 21 that counts the signal is
When the value matches the value stored in the ROM 24, the comparator 28 generates a logic 1 output and the OR gate 15
Add to. The output terminal of the OR gate 15 is connected to the F/
It is connected to the trigger input terminals of F17-20.

The PLS input via the AND gate 12
Memory values a ₁ , a _{2 , q of the ROMs 25 to 27} from which the count value of the counter 22 that counts signals is selected
If it matches any one of , the comparator 29
generates the SFDR signal of logic 1. Applicable
The SFDR signal is applied to the reset input of the counter 22 to reset the counter 22. SFDR
The signal also passes through AND gate 13 to counter 2
3 is input. The count value of the counter 23 is
12, that is, when the swing fin 1 has moved one way, the AND gate 14 outputs an output with a logical value of 1, and this output is applied to the OR gate 15.
Therefore, the OR gate 15 shifts the shift register made up of F/Fs 17 to 20 by 1 each time the outputs from the comparator 28 and the AND gate 14 are input.

The operation shown in FIG. 3 will be explained below in relation to the operation of the swing fin 1 and the feeding of the paper 2. It is assumed that the first fold of the paper 2 is convex to the left in FIG. 1, and the swing fin 1 is at the right end.

Until the leading edge of the paper 2 reaches the roller 7
Since the TOPS signal has a logic value of 0, F/F 17 is set and F/Fs 18-20 are reset. In addition, the counters 21 to 23 are connected to the inverter 1.
All are reset by the output of logical value 1 of 6.

When the leading edge of paper 2 reaches the roller 7, TOPS
When the signal becomes a logical 1, the AND gate 11 opens its gate, so the counter 21 counts the PLS signal. The count value of counter 21 is
When the value matches the value stored in the ROM 24, the comparator 28 outputs a match signal. At this time, the paper 2 is protruding from the tip of the swing fin 1 by (L + m),
The swing fin 1 is not yet driven and remains at the right end.

The coincidence signal is passed through the OR gate 15 to F/F1.
Since it is input to trigger terminals 7 to 20,
F/F 17 is reset and F/F 18 is set. As a result, ROM24 is no longer selected, and ROM25 is now selected. Also, F/
Since F17 has been reset, AND gate 11
and 12 close and open their gates respectively, PLS
The signal is not input to the counter 21, but only to the counter 22. When the count value of the counter 22 and the stored value _a1 of the ROM 25 match, the comparator 29 outputs a match signal. The matching signal SFDR
Accordingly, the swing fin 1 advances by one step. At the same time, the counter 22 is reset by the SFDR signal, and the counter 23 is incremented by 1. Similar operations are repeated until the count value of the counter 23 reaches 12.

When the count value of the counter 23 reaches 12, the output of the logical value 1 of the AND gate 14 is output from the OR gate 15.
Since the signal is applied to the trigger terminals of F/Fs 17 to 20 via the F/F 18, the F/F 18 is reset, and in turn, the F/F 19 is set. At this time, swing fin 1 is driven by 12 steps, so
It will be located on the left side. Further, the paper 2 protrudes from the tip of the swing fin 1 by L+m+S·a ₁ /P, and the distance from the fold closest to the swing fin 1 to the tip of the swing fin 1 is m+S·a ₁ /P.

Now that F/F19 has been set, it is time to set the ROM.
26 is selected. When the paper 2 is further fed and the count value of the counter 22 and the stored value _a2 of the ROM 26 match, the comparator 29 outputs a match signal.
As mentioned above, the swing fin 1 advances by one step due to the coincidence signal SFDR. At the same time, the counter 22 is reset by the SFDR signal, and the counter 23 is incremented by 1. Similar operations are repeated until the count value of the counter 23 reaches 12.

When the count value of the counter 23 reaches 12, the output of the logical value 1 of the AND gate 14 is output from the OR gate 15.
Since the signal is applied to the trigger terminals of F/Fs 17 to 20 via , F/F 19 is reset, and F/F 20 is then set. At this time, swing fin 1 is driven by 12 steps, so
It will be located on the right side. Also, the paper 2 is L + m + S (a ₁ + a ₂ )/P from the tip of the swing fin 1.
The distance from the fold closest to the swing fin 1 to the tip of the swing fin 1 is m+S(a ₁ +a ₂ )/PL. If m, a ₁ and a ₂ are appropriately set so that this distance m+S(a ₁ +a ₂ )/PL is equal to the above-mentioned A, the subsequent folding operation will be the same as the steady state folding operation.

That is, the F/F 20 is set and the ROM 27
is selected, the count value of the counter 23 is
It is compared with the stored value q in the ROM 27, and every time these values match, a match signal SFDR is sent from the comparator 29.
A signal is generated to drive the swing fin 1 one step. Note that since F/F20 is set, AND gate 13 closes that gate,
The SFDR signal is never input to the counter 23, and the counter 23 never counts up. Therefore, F/F 20 remains set. This means that the swing fin 1 continues to be driven while maintaining a steady state, that is, the relationship expressed by equation (1) above.

As described above, according to the present invention, the leading edge of the paper can be reliably processed using only a simple control circuit without providing a paper leading edge processing mechanism with a complicated structure. Also, if you set the initial position of the swing fin appropriately corresponding to the first crease,
Since the starting edge of the paper can be folded reliably, it can be folded regardless of the presence or absence of paper on the paper holder, and there is no need to eject the paper on the paper holder one by one after one job is completed, and the printing device can be easily folded. This has the effect of improving the operating rate.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of a conventional folding device, FIG. 2 is a side view showing a tip reaching detection mechanism in the folding device, and FIG. 3 is a block diagram showing an embodiment of the control device of the present invention. In the figure, 1 is a swing fin, 2 is paper, 11 to 14
is an AND gate, 15 is an OR gate, 16 is an inverter, 17-20 are triggerable flip-flops (F/F), 21-23 are counters, 24-
27 is a ROM, and 28 and 29 are comparators.

Claims (1)

[Scope of Claims] 1. A paper folding device that folds paper using a swing fin that operates in a pendulum manner in the folding direction of the paper in synchronization with the crease interval of continuous paper having creases at predetermined intervals, the paper folding device comprising: The length is L, the number of paper feed signals generated each time the paper is fed by a unit length is P, and the paper feed signal is q.
The swing fin is driven one step each time a sheet of paper is generated, and the swing fin is driven semi-reciprocating in S steps. In the paper folding device, the swing fin is driven to fold the paper so that the swing fin is at a distance of A (A<L) from the tip of the swing fin and satisfies the relational expression LP=qS, Every time _ao (n is an integer of 1 or more, ao _< q) paper feed signals are generated, n different data of _ao are generated to generate a drive signal for driving the swing fin. n storage means 25 and 26 for respectively storing and counting the paper feed signal;
The leading edge of the paper has a predetermined length [L + m] (A < m
<L) first means 21 and 28 that generate an output when the drive signal is ejected; step count means 23 and 14 that count the drive signals and generate an output every time S counts; and the first means and the step selection means 18 and 19 for sequentially selecting one of the n storage means in response to the output of the counting means;
a second means 22, 29 for counting the paper feed signal and generating the drive signal when the count value becomes equal to data _ao of one storage means selected by the selection means; The swing fin is rotated by ₁ every time ao paper feed signals are generated.
When the paper is driven in steps and semi-reciprocated by the S step, and this semi-reciprocating drive is performed n times during start edge processing, the distance between the fold closest to the swing fin of the paper being ejected from the swing fin and the tip of the swing fin is m+S/P _o 〓 A control device for a paper folding device, characterized in that m, _ao , and n are set so that n ⁼¹ a _o -(n-1)L is approximately equal to the distance A.