JPH0625337Y2 - Printer with automatic paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a printer with an automatic paper feeder, and more particularly to a printer with which two types of paper feed modes can be selectively set.

[Prior art]

Generally, in a printing device such as an electronic typewriter, an automatic paper feeding device that sets a plurality of printing papers in a stacker in advance and automatically supplies the printing papers one by one to the platen of the printing device when printing document data I have something to prepare. In this automatic paper feeding device, when the automatic paper feeding is instructed, first the feed roller of the automatic paper feeding device is driven to rotate, the printing paper set in the stacker is supplied to the platen through the paper guide passage, and the platen is driven to rotate. It is designed to be sent to the print start position.

However, if the print paper is fed backward by more than the specified amount while the print paper is still held by the feed roller, the print paper is caught in front of the feed roller, a so-called paper jam occurs, and the print paper is wrinkled. There is a problem of bending and bending.

Therefore, the applicant of the present application has proposed a paper feeding device (Japanese Patent Application No. 60-96478) in a printing device with an automatic paper feeding device in order to prevent a paper jam. This paper feeding device rotates the feed roller of the automatic paper feeding device to feed the printing paper to the platen through the paper guide passage, and drives the platen to feed the printing paper out of the automatic paper feeding device. The platen is rotated in the reverse direction so that the printing paper is introduced into a paper retreat passage different from the paper guide passage, and then the printing paper is set at the printing start position.

[Problems to be solved by the invention]

In the paper feeding device in the printing device with automatic paper feeding according to the above-mentioned application, even if the reverse paper feeding is not performed as in the case of printing data in the text memory, the printing paper is automatically Since it is sent out of the paper feeding device and set in the print start position after being introduced into the paper retraction path, it takes a lot of time for the paper feeding operation, and the work efficiency decreases when printing on multiple sheets. There is a problem.

[Purpose of device]

An object of the present invention is to provide a printer with an automatic paper feeder that can selectively set two kinds of paper feed modes and can automatically feed paper in a paper feed mode according to the content of a document to be printed. It is in.

[Means for solving problems]

As shown in the functional block diagram of FIG. 1, a printer with an automatic paper feeder according to the present invention receives a paper feed command and rotates a feed roller of the automatic paper feeder to rotate a print paper into a paper guide passage. After that, the first paper feed mode in which the print paper is set to the print start position by rotating and driving the platen, and the paper feed command is received, the feed roller of the automatic paper feeder is rotationally driven to print the print paper. After feeding the paper to the platen through the paper guide path, the platen is driven to rotate to feed the print paper to the outside of the automatic paper feeder, and the platen is rotated in the reverse direction to introduce the print paper into the paper withdrawal path to remove the print paper. Based on the mode switching means for selectively switching between the second paper feed mode set at the print start position and the mode selected and set by the mode switching means, La and platen is that a feed control unit for controlling driving.

[Action]

In the printer with an automatic paper feeding device according to the present invention, the mode switching means selectively switches between the first paper feeding mode and the second paper feeding mode, and the paper feeding control means is a mode selected and set by the switching means. The feed roller and the platen are driven and controlled based on the above.

That is, when the first paper feed mode is selected and set by the mode switching unit, the feed roller is rotationally driven by the paper feeding control unit to supply the print paper to the platen through the paper guide passage, and further drive the platen. Causes the printing paper to be set at the printing start position. When the second paper feed mode is selected and set by the mode switching means, the feed roller is rotationally driven by the paper feeding control means, the printing paper is supplied to the platen through the paper guide passage, and the platen is rotationally driven to print the printing paper. Is sent out of the automatic paper feeding device, the platen is further rotated in the reverse direction, the printing paper is introduced into the paper withdrawal passage, and the printing paper is set at the printing start position.

[Effect of device]

As described above, according to the printer with an automatic paper feeder of the present invention, since the mode switching means is provided, the first paper feeding mode and the second paper feeding mode can be easily and selectively switched. it can.

Therefore, when the document data in the text memory is automatically printed, the first paper feed mode with high paper feeding efficiency is selected, and when the document data is input and created, the paper jam is selected. It is possible to properly use both modes, such as selecting a second paper feed mode that can prevent the above.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

In this embodiment, the present invention is applied to an electronic typewriter with an automatic paper feeder.

As shown in FIG. 2, a keyboard 3 is arranged in the front part of the main body frame 2 of the electronic typewriter 1, and the keyboard 3
The printing mechanism PM is disposed on the main body frame 2 behind the
Further, an automatic paper feeder F is mounted on the main body frame 2 above the printing mechanism PM.

The keyboard 3 includes character keys 10 including alphabetic keys, numeral keys, and symbol keys, a line feed key 11, a superscript key (a sheet half line return key) 12, a subscript key (a sheet half line feed key) 13. Or a paper insert key 14 for instructing the automatic feeding of the printing paper 30 set in the automatic paper feeder F, and selectively setting one of the first paper feeding mode and the second paper feeding mode. A paper feed mode changeover switch 15 is provided for this purpose, and in addition to these, various function keys are provided as in a normal typewriter.

The printing mechanism PM includes at least a platen 20 for feeding the printing paper 30, a motor for driving the platen 20, a drive circuit for the platen 20, a carriage 22 supported by a guide rod 21 parallel to the platen 20, and a reciprocating drive for the left and right directions. Motor and its drive circuit, the type wheel 24 housed in the wheel cassette 23, the motor and its drive circuit that drive it, the printing hammer that strikes the type 25 of the type wheel 24, and the solenoid 26 and its drive circuit that drive it. The printing mechanism PM is similar to the printing mechanism of a normal electronic typewriter.

As shown in FIGS. 3 and 4, the automatic sheet feeder F includes a mounting plate 27 provided on the automatic sheet feeder F and a typewriter 1.
Of the typewriter 1 by mounting the rear portion of the automatic sheet feeder F on the main body frame 2 while engaging with the pin 28 of the typewriter 1.
Is attached to.

A plurality of print sheets 30 of a predetermined size are stored in the stacker 29 of the automatic paper feeder F, and the push plate 31 of the stacker 29 is urged forward (rightward in the figure) by the spring 32. Further, a limit switch 81 is arranged near the lower end of the push-out plate 31, and when the limit switch 81 is pressed by the print paper 30, the print paper set is detected. The feed roller 33 is rotatably disposed in the front part of the lower end of the stacker 29, and when the feed roller drive solenoid 82 (see FIG. 5) is excited, the platen 2
The driving force of 0 is transmitted to the feed roller 33 and the platen 2
The printing paper 3 in the stacker 29 is driven to rotate together with 0.
0 is not sent out. A guide member 34 is provided in front of the feed roller 33, and a front end portion 34 a of the guide member 34 and an upper front surface 35 of the stacker base 35 are provided.
a and the guide member 36 and the separator 3 as a branch member
A paper guide passage A1 is formed by 7 and the feed roller 3
The printing paper 30 sent out in 3 is supplied to the platen 20 of the printing mechanism PM through this passage A1. The lower tip portion of the separator 37 is formed into an acute angle, and the separator 37
The front surface is disposed in the vicinity of the guide member 36 so that the printing paper 30 cannot be inserted from the platen 20 toward the automatic paper feeder F. An optical sensor 38 is provided inside the guide member 36, and a reflector plate 39 is provided at a position facing the optical sensor 38 of the main body frame 2.
When the print paper 30 passes between the optical sensor 38 and the reflection plate 39, the start end 30a and the end 30b of the print paper 30 are detected.

The platen 20 is rotatably supported by the main body frame 2,
By rotating the platen 20 in both forward and reverse directions by an arbitrary angle by the platen drive circuit, the printing paper 30 supplied to the platen 20 is forwarded and reversely fed. A paper pan 40 that guides the printing paper 30 and a pair of pressing rollers 41 that are in contact with the platen 20 are provided on the outer peripheral portion of the platen 20, and the paper pan 40 and both rollers 41 supply the paper from the automatic paper feeder F. The printing paper 30 is fed along the platen 20. At the position facing the platen 20,
A carriage 22 equipped with a wheel cassette 23 and a solenoid 26 is slidably supported by a guide rod 21 extending in the left and right directions.

An outlet guide member 42 is provided in front of the guide member 36, and a sheet discharge passage A2 is formed by the outlet guide member 42 and the guide member 36, and the printing sheet 30 sent by the rotation of the platen 20 passes through this passage. And is sent out of the printing mechanism PM.

As described above, the feed roller 33 of the automatic paper feeder F is rotationally driven to supply the print sheet 30 to the platen 20 through the sheet guide passage A1, and the platen 20 is rotationally driven to set the print sheet 30 at the print start position. The paper feed mode to be set is the first paper feed mode.

The bottom plate 35b of the stacker base 35 and the main body frame 2 form a sheet withdrawal passage A3.
An opening 43 for opening the printing paper 30 from the passage A3 to the outside is provided at the rear part. Printing paper 30
When the printing paper 30 is fed backward after the trailing end 30b of the printing paper 30 passes through the branching point 37a of the separator 37, the trailing end 30b of the printing paper 30 is branched at the branching point 37a as shown in FIG. Passes through the sheet evacuation passage A3 and is opened to the outside through the opening 43.

In this way, the feed roller 33 of the automatic paper feeder F is rotationally driven to supply the print sheet 30 to the platen 20 through the sheet guide passage A1 until the end 30b of the print sheet 30 passes the branch point 37a. The print sheet 30 is introduced into the sheet discharge passage A2 by rotating the sheet feeding device and fed to the outside of the automatic paper feeder F, and the platen 20 is rotated in the reverse direction to introduce the print sheet 30 into the sheet retreat passage A3. The paper feed mode in which 30 is set at the print start position is the second paper feed mode.

Next, the overall configuration of the control system of the electronic typewriter with automatic paper feeder will be described with reference to the block diagram of FIG.

The electronic typewriter 1 is basically composed of a keyboard 3, a printing mechanism PM, an automatic paper feeder F, a controller C, etc.
The keyboard 3 and the printing mechanism PM are connected to an input / output interface 80, and the input / output interface 80 is a CPU (central processing unit) of the control unit C via a data bus or the like.
The automatic paper feeder F and the optical sensor 38 are further connected to the input / output interface 80.

Paper feed mode switch 15 provided on the keyboard 3
Outputs a paper feed mode signal according to switching between the first paper feed mode and the second paper feed mode. The controller C includes an input / output interface 80, a CPU 50, a ROM (read only memory) 60 and a RAM (random access memory) 70 connected to the CPU 50 via a data bus or the like. .

The keyboard 3 is stored in the program memory 61 of the ROM 60.
A control program for controlling the printing mechanism PM in accordance with the code data input from each of the character keys 10 and various function keys, a control program for discharging the printing paper 30 in the middle of printing or in a printing completed state, and the first paper feed. Printing paper 3 in mode
A first feeding control control program that automatically feeds 0, a second feeding control control program that automatically feeds the printing paper 30 in the second feeding mode, and a feeding program switching control program that will be described later Is remembered.

The RAM 70 is provided with various memories for temporarily storing the result of arithmetic processing by the CPU 50.

CPU50, based on the control program, line feed key 1
1, a control signal is output to each drive circuit of the printing mechanism PM according to the operation of the superscript key 12, the subscript key 13, the paper insert key 14, and the like.

The optical sensor 38 is provided from the start end to the end end 30 of the printing paper 30.
An "L" level signal is output when passing between the optical sensor 38 and the reflection plate 39 over a, and an "H" level signal is output otherwise.

The automatic paper feeder F includes a limit switch 81 for detecting the presence / absence of the printing paper 30 and a platen 2 for the feed roller 33.
A feed roller driving solenoid 82 for transmitting the driving force from 0 and a solenoid driver 83 for driving the feed roller driving solenoid 82 are provided. One terminal of the limit switch 81 is grounded and the other terminal is grounded. Is connected to Vcc via pull-up resistor R _1.
It is connected to the (constant voltage line) and is also connected to the input / output interface 80. Limit switch 81
As a paper signal, when the print paper 30 is set in the stacker 29, an "L" level signal is output, and when the print paper 30 is not stored, an "H" level signal is output. The feed roller drive solenoid 82 is a CPU
When the solenoid driver 83 is driven to excite by receiving a control signal from 50, the rotational driving force of the platen 20 is transmitted to the feed roller 33 via a clutch (not shown). As a result, the feed roller 33 moves to the platen 2
The printing paper 30 is fed to the platen 20 by being driven to rotate in the same direction as 0.

Next, the paper feed mode switching control performed by the control device C of the electronic typewriter will be described with reference to the flowchart of FIG.

When the power of the typewriter 1 is turned on, this control is started, and in step S1 (hereinafter, simply referred to as S1 and the other steps are handled in the same manner), the initial setting is executed and the process proceeds to S2 to wait for a key input. To do.

When the paper insert key 14 is operated to automatically feed the printing paper 30, it is determined as Yes in S3 and S4.
Move to. In S4, it is determined based on the paper signal of the limit switch 81 whether or not the printing paper 30 is loaded in the stacker 29. When the result is Yes, that is, when the signal is the "L" level signal, the process proceeds to S6, and when the result is No, the result is When the signal is the "H" level signal, the process proceeds to S5, a warning is given to the operator by a buzzer or the like, and the process returns to S2.

In S6, it is determined whether or not it is the first paper feed mode based on the paper feed mode signal of the paper feed mode selection switch 15, and when it is the first paper feed mode, the process proceeds to S7. In S7, platen 2
After the sensor signal from the sensor 38 is switched from “L” to “H” while rotating 0 in the normal direction, the platen 20 is driven in the normal direction by a predetermined amount, and the print paper 30 that has undergone the print processing is discharged to the outside. . In the next step S8, the feed roller drive solenoid 82 is excited and driven in response to the control signal from the CPU 50 to connect the clutch. In S9, the platen 20 and the feed roller 33 are driven to rotate in the normal direction, the sensor signal from the optical sensor 38 is switched from "H" to "L", and then the platen 20 is driven to rotate in the normal direction by a predetermined amount, and the printing paper 30 Is set to the print start position. At this time, the feed roller 33 is rotationally driven together with the platen 20 by the clutch connection,
The printing paper 30 is sent from the stacker 29 to the platen 20. At the next step S10, the feed roller drive solenoid 82 is demagnetized in response to the control signal from the CPU 50,
Return to S2.

When it is determined No in S6, that is, when the second paper feed mode is selected, the process proceeds to S11. In S11,
As in S7, the platen 20 is driven to rotate in the normal direction, and the printing paper 30 that has undergone the printing process is discharged to the outside. In the next step S12, the feed roller drive solenoid 82 is excited to connect the clutch, and in step S13, the platen 20 is driven to rotate in the normal direction, and the printing paper 30 is set at the printing start position, as in step S9. In S14, the feed roller drive solenoid 82 is demagnetized in response to the control signal from the CPU 50. In the next step S15, the platen 20 is further driven in the normal direction by a small amount, and it is determined in step S16 whether or not the trailing end 30b of the print sheet 30 has passed the branch point 37a based on the sensor signal of the optical sensor 38. When, that is, when it is the "L" level signal, the process returns to S15. When S15 to S16 are repeated to feed the print sheet 30 and the trailing end 30b of the print sheet 30 passes the branch point 37a, an "H" level signal is output from the optical sensor 38, and it is determined Yes in S16. Then, the process proceeds to S17.

In S17, the platen 20 is reversely driven by a predetermined amount based on the length of the print sheet 30 determined based on the sensor signal when the print sheet 30 passes the start end 30a and the sensor signal when the print end 30 passes the end 30b. The trailing edge of the sheet 30 is the sheet evacuation passage A.
3, the reverse feed is performed until the print sheet 30 is set at the print start position, and the process returns to S2.

When any key other than the paper insert key 14 is operated, the process proceeds to S18 via S2 to S3, performs other key processing, and returns to S2.

As described above, by operating the paper feed mode switch 15, the mode can be easily switched between the first paper feed mode and the second paper feed mode.

Therefore, when the paper feed mode changeover switch 15 is operated to select the first paper feed mode, the print paper 30 is fed to the automatic paper feeder F.
The time required for automatic sheet feeding from the sheet to the platen 20 and setting at the print start position can be greatly reduced.

When the second paper feed mode is selected by operating the paper feed mode switch 15, it is possible to prevent the occurrence of paper jam in front of the feed roller 33 even when the print paper 30 is fed backward by a predetermined amount or more.

By the way, when the paper feed mode switching control routine in the above embodiment is partially changed as shown in FIG. 7 and the paper insert key 14 is operated, first the print paper 30 is moved to the print start position in the first paper feed mode. When the second sheet feeding mode is set and the second sheet feeding mode is selected, the remaining control of the second sheet feeding mode may be executed. Since S1 to S4 are the same as those in the flowchart of FIG. 6, their description will be omitted.

That is, when the determination result of S4 is Yes, the process proceeds to S30. If it is determined that the sheet is automatically fed in the first sheet feeding mode through S30 to S33 and the second sheet feeding mode is selected in S34, steps S35 to S37 are executed to automatically feed the sheet in the second sheet feeding mode. To be done.

In this embodiment, the platen 20 is driven in the normal direction by a predetermined amount based on the sensor signal from the optical sensor 38 so that the printing paper 30 is set at the printing start position. The size of the printing paper 30 loaded in the paper feeding device F is limited to A4 size and B5 size, and the paper insert key 1 is set when the first paper feeding mode is set.
4 is operated, the platen 20 is driven forward by a predetermined amount to set the printing paper 30 at the printing start position. When the paper insert key 14 is operated when the second paper feed mode is set, the end 30b of the A4 size printing paper 30 is set. Is branch point 3
The platen 20 is driven in the normal direction by a predetermined amount until it passes 7a, the printing paper 30 is sent to the outside of the automatic paper feeder F, and the platen 20 is further driven in the normal direction by a predetermined amount, so that the A4 or B5 size printing paper 30 May be introduced into the paper withdrawal passage A3 and set at the print start position.

Even if the size of the printing paper 30 is different, such as A4 size and B5 size, the printing paper 30 is finally set at the printing start position in both the first paper feeding mode and the second paper feeding mode. Such paper feeding is possible.

In the above embodiment, the electronic typewriter provided with the type wheel printer has been described, but the present invention can be similarly applied to the typewriter provided with the thermal printer, the shuttle printer and the wire dot printer. Needless to say.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing the configuration of the present invention, and FIGS.
FIG. 7 shows an embodiment of the present invention. FIG. 2 is a perspective view of a typewriter with an automatic paper feeder, and FIG. 3 is a longitudinal side view of the automatic paper feeder showing a first paper feed mode. FIG. 4 is a view corresponding to FIG. 3 of the automatic paper feeder showing the second paper feed mode, FIG. 5 is a block diagram of the control system of the typewriter, FIG. 6 is a flow chart of a mode switching control routine, and FIG. 9 is a partial flowchart of a mode switching control routine according to a modification. 14 ... Paper insert key, 15 ... Paper feed mode switch, 20 ... Platen, 30 ... Printing paper,
33 ... Feed roller, 37 ... Separator, 50 ...
... CPU, 60 ... ROM, 70 ... RAM, A1 ...
Paper guide passage, A3 ... Paper escape passage, F ... Automatic paper feeder, PM ... Printing mechanism, C ... Control device

Claims (1)

[Scope of utility model registration request] 1. A printer equipped with an automatic paper feeder, which receives a paper feed command, rotationally drives a feed roller of the automatic paper feeder, feeds print paper to a platen through a paper guide passage, and rotates the platen. In response to the first paper feed mode in which the print paper is set to the print start position by driving it and the paper feed command, the feed roller of the automatic paper feeder is driven to rotate and the print paper is fed to the platen through the paper guide passage. After that, by rotating the platen, the printing paper is sent to the outside of the automatic paper feeder, and by further rotating the platen backward, the printing paper is introduced into the paper withdrawal passage and the printing paper is set at the printing start position. Based on the mode switching means for selectively switching between the paper mode and the mode selected and set by the mode switching means, the feed roller and platen are Automatic sheet feeder with a printing device which is characterized in that a feed control unit for turning control.