JPS58162362A - Paper feeding device - Google Patents

Abstract

PURPOSE:To perform a large quantity of paper feeding by a simple operation, in a printing device of a desk top calculator, by providing a mechanism, which detects the paper feeding of a predetermined quantity, and controlling the paper feeding mechanism based on the feedback of the detected signal. CONSTITUTION:At an initial state, a PF key 21 is OFF, P is a 0, a counter 27 is not counted, and a noninverted output Q1 is a 0 in a flip flop circuit 241. Therefore, X is a 0, and a paper sheet feeding driver 26 is not driven. When the key 21 is turned ON, and AND gate 234 and an OR gate 251 are opened, and the driver 51 is started. When the key is turned OFF before the paper sheet is fed by a specified number of lines, a gate 252 is opened through an inverter 22, and the driving is stopped. When the key 21 is kept ON for a specified number of the lines or more, the counter 27 becomes ''1'', and continuous paper feeding is performed. Even though the key 21 is turned OFF, the circuit 241 is continued to be set and the paper sheet feeding is continued. Then the key 21 is turned ON once more, the gate 231 is opened, the circuit 241 is reset, and the paper sheet feeding is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device, and particularly to a paper feeding device ζ1 used in an electronic device equipped with a printing device.

Conventionally, in paper feed devices of printing devices used in electronic devices such as electronic desk calculators (hereinafter referred to as calculators), there is a paper feed key (hereinafter referred to as PF).
While the PF key is held down, the paper is continuously fed in units of a predetermined number of lines, and after the PF key is released, the paper is fed in the same line units for a while, and then the operation stops. A paper feeding method is adopted in which the machine stops.

In other words, if the paper feed unit line number is 1 line, depending on the pressing time of the PF key, 1, 2, 3, 4... line by line, and if the unit line number is 3 lines, 3, 6, 9,... 12...The paper is fed by an integer multiple of the number of lines and unit lines in proportion to the pressing time of the PF key.

In such a conventional paper feeding method, it is necessary to continuously press the PF key even when the number of paper feeding lines is large.

For example, when attaching a roll of printing paper 4 to the calculator 1 as illustrated in FIG. While inserting the leading edge of the printing paper 4, continue to press the PF key 3a located on the keyboard section 3 with your left hand until the printing paper 4 is loaded into the printing mechanism via the paper feeding device built into the calculator 1. There must be. After this, the printing paper 4 is installed in the holder 2 and the work is completed, but since it is necessary to keep pressing the PF key throughout this installation process, the printing paper 4 is always forced to be introduced into the inlet with one hand. become.

The present invention has been made in view of the above-mentioned drawbacks of conventional paper feeding devices, and an object of the present invention is to provide a paper feeding device that can easily feed a large amount of paper.

In order to achieve the above object (2), the present invention employs a configuration in which a mechanism is provided to detect that paper has been fed by a preset amount, and the paper feeding mechanism is controlled based on this feedback.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 2 shows a first control circuit for a paper feeding device of an electronic device according to the present invention.
An example of this is shown as a block diagram. This embodiment employs a device that detects paper feed by a predetermined number of lines.

In FIG. 2, the reference numeral 20 is a DC power supply.
The negative side is grounded, and the positive side is connected to PF key 2.
1 to the inverter 22, AND gates 231, 23
4 are connected. AND gate 4231 has three input terminals, and its output is connected to the reset terminal R of flip-flop 2'41.

The set terminal S, (2) of the flip-flop 241 is connected to the output of the counter 27, and its non-inverted output Q, is connected to the inputs of the M gates 231, 233 and the OR gate 251. Q1 is input to the AND gate 232 together with the output of the previous inverter 22'', and the output of the M gate 232 is connected to the reset terminal R2 of the flip-flop 242.The output of the inverters 2 and 2 is input to the M gate 233. and OR gate 25
The output of the gate 233 of M is connected to the set terminal S2 of the flip-flop 242.

The non-inverted output Q2 of the flip-flop 242 is input to the R gate 231 and the OR gate 252. OR
The output of the gate 252 is input to the counter 27 as a reset signal RC.

The inverted output Q2 of the flip-flop 242 is N] gate 2
34, and the output of MD gate 234 is input to OR gate 251. The output of the OR gate 251 is input to the paper feed driver 26.
The monitor signal No. 6 is fed back to the counter 27.

The counter 27 counts the number of monitor signals sent each time the paper is fed by one line, and when the signals for a predetermined number of lines (for example, 6 lines) are counted, a logic
1”.

Next, the operation of the above configuration will be explained in detail with reference to the truth table shown in Table 1 below.

Table 1 However, in Table 1, flip-flop 241.
The non-inverted output of 242 is Ql, Q2 is the output of PF key 21, P is the output of OR gate 25L, and the respective logical values are represented.

First, in state 1 (initial state), the PF key is OFF.
Since F, P=O, and the counter 27 has not counted the scheduled number of lines, so the flip-flop 2
41 is not set and Q1=0. Since P=0, M
■ Since gate 234 does not open and Q, = o, OR
Gate 251 also does not open and is X-0. Therefore, X=
The paper feed driver 26, which is driven when the number is 1, is not driven.

Next, when the PF key 21 is pressed to turn it ON, since P-1 and the flip-flop 241 are not set, the inverted output Q2-1 opens the AND gate 234, and the OR gate 234 opens.
The gate 251 also opens, which causes the paper feed driver 2-6 to
is activated and paper feeding begins. (State 2) Step? When the PF key is released and turned off before the paper is fed by a constant amount (for example, about 6 lines), the OR gate 252 opens via the inverter 22 and a reset signal RC is sent to the counter 27. is, AND
Driving of the paper feed driver 26 via the gate 234 is stopped, and the process returns to step 1. In other words, paper feeding beyond a constant number of lines is performed by repeating state 1 and state 2.

Next, in state 2, if the PF key 21 continues to be turned on and the number of lines equal to or greater than the scheduled number is held, the process moves to state 3.

That is, the counter 27 outputs a logic "1" upon receiving a monitor signal equal to or greater than a constant load, and the flip-flop 241 outputs a logic "1".
is set, Q=1, therefore the output of OR gate 251 remains at X=1, and continuous paper feeding is executed. (State 3) Even if the PF key 21 is turned OFF here, the flip-flop 241 continues to be set, so the state of X does not change. In other words, once paper feeding beyond the scheduled number of lines is started, paper feeding continues even if the PF key 21 is turned off. (State 4) OFF of this PF key 21 inverts the output of the imperter 22 and
Since 1 is set, the AND gate 233 opens and the Noritsu flop 242 is set, resulting in Q2-1.

(State 5) Even in this state 5, paper feeding is continued by the flip-flop 241.

Next, turn on the PF key 21 one more time (state 6
), P=1 Ql-1 Q2-1, so the NΦ gate 231 opens and the solve flop 241 resets.
Q,=0, and paper feeding stops due to X=o. (State 7) Next, when you release your finger that was pressing the PF key 21, (
In state 8), since the output of the inverter 22 is 1" and the flip-flop 241 is reset, it is Ql-1, so the AND gate 232 opens and the flip-flop 242
is reset, and the counter 27 is also reset via the OR gate 252 to return to the initial state (state 1).

To summarize, if the paper feed is less than the scheduled number of lines, releasing the PF key 21 will stop the paper feeding, and once the paper has been fed by the scheduled number of lines or more, press the PF key 21 again. Even if you release your finger from the PF key 21, paper feeding will continue until the PF key 21 is pressed down.

Next, FIG. 3 shows a second embodiment of a control circuit for a paper feeder according to the present invention. The only difference in configuration from the first embodiment described above is that the NΦ gate 234 is omitted, and other equivalent parts (2 are given the same reference numerals).

Further, the truth table of the circuit shown in FIG. 3 is shown in Table 2, and the operation will be explained below with reference to this table.

Table 2 The difference between Tables 1 and 2 is only in state 7, and the operation in paper feed within constantness and the operation in continuous paper feed before that are the same as in the first embodiment.0 That is, In the first embodiment, when the PF key 21 is pressed again in state 6 to stop continuous paper feeding, the state immediately shifts to state 7, and the solve flop 241
Paper feeding is stopped by resetting , whereas in the second embodiment, pressing the PF key 21 again in state 6 only causes a reset of the fugutsubu flop 241 via the AND gate 231 in state 7. However, the paper feed does not stop.

This is because while this PF key 21 is pressed, the OR gate 25
This is because 1 is open. Next, when you release your finger from the PF key 21 and turn it off, that is, in state 8, the MIOR
The gate 251 closes, the drive of the paper feed driver 26 ends, and continuous paper feeding stops.゛By turning off this PF key 21, the same <Ql''1 as in the first embodiment occurs.
And since the output of the inverter 22 is 61", the gate 2 of M
32 opens and flip-flops'
242 is reset, the counter 27 is also reset via the OR gate 252, and the initial state (state 1) (-
return.

To summarize, when paper feed is less than the scheduled number of lines, paper feeding will stop when you release your finger from the PF key 21, and once paper feeding has started exceeding the scheduled number of lines, press the PF key 21 again. Paper feeding continues until you press and then release your finger.

Next (the second and third embodiments will be explained with reference to FIG. 4). On the other hand, the third
In this embodiment, a configuration is adopted in which paper feeding is automatically continued for a certain period of time or more. This configuration is the first. This is realized by replacing the counter in the second embodiment with a timer.

As you can see at a glance in Figure 4, this circuit configuration is similar to Figure 2 (
The circuit of the first embodiment is replaced with a timer 28 instead of the counter 27, and the monitor signal for the paper feed drive rack 26 is omitted (this is nothing but the second example).

The timer 28 receives a reset signal R from the OR gate 252.
Reset by T, output logic "0", and start time measurement [
7. It is configured to output 1'' after a certain period of time.

The operation in this configuration is equivalent to repeating states 1 to 2 of the truth table in Table 1 for paper feeding within a certain time, and the detection of a certain paper feeding amount is performed by the number of lines or by time. The only difference is whether you do it or not. Regarding the continuation of continuous paper feeding, the truth table is the same as Table 1,
Is it possible to detect a certain amount of paper feed based on the number of lines?
The only difference is whether you do it or not depending on the time.

Above, three types of embodiments have been described in detail, but in all of them, a fixed paper feed amount is set, and from then on, when paper feed of -L is started, paper feed is automatically performed until the next instruction is given. It is something that will continue. In other words, momentarily press the PF key.
It can be used as both a switch (ON for as long as it is pressed) and an alternate switch (remains ON when pressed).

Comparing the first embodiment and the second embodiment, the second embodiment reduces the cost by one gate of M, but the cost of P
Since paper feeding is not stopped the moment the F key is pressed, those skilled in the art can take this into consideration when making a selection. Furthermore, those skilled in the art will be able to easily implement various modifications from the embodiments disclosed above.For example, it is possible to omit the AND gate 234 even in the third embodiment shown in FIG. be.

When the configuration of the present invention detailed above is adopted, a fixed paper feed amount is set, and once paper feeding beyond that amount is started, paper feeding is automatically continued until the next instruction is given. Because of this structure, it is possible to achieve the excellent effect of being able to feed a large amount of paper with a simple operation without being forced to perform unreliable one-handed work when loading printing paper as in the conventional example.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view illustrating the drawbacks of a conventional paper feeding device used in an electronic device with a printing device, and FIGS. 2 to 4 are block diagrams illustrating details of different aspects of the present invention. 21...PF key 26...Paper feed dryer (-27...Counter 28...Timer 2
41.242...Solitsubfrotz/Figure 3Figure 4

Claims (1)

[Claims] It has means for detecting that the paper feed mechanism has been operated for a preset number of digits or time, and an input means for issuing a paper feed start command, and the amount of paper feed is controlled by the detection means and the input means. A paper feeding device characterized by: