JPS61263532A - Recording apparatus - Google Patents

Abstract

PURPOSE:To prevent a sheet from being wrinkled and folded by providing a back-insertion preventing plate adapted to open and close by a link mechanism connected to a motor in a space portion for discharging a recording sheet, whereby even if the recording sheet is fed reversely, the trailing end of the sheet will not be caught on the feeder side. CONSTITUTION:A back-insertion preventing plate is disposed in such a manner as to close an opening portion 4c between a side plate 4a and a guide plate 4b of a discharge tray 5, and one end of the preventing plate is connected to an eccentric pin 13b fixed to a motor shaft by a link lever 14. In the case where detection of a recording sheet 3 is not conducted by a paper sensor 6b, and a recording sheet 3 is fed reversely for correction or the other reasons, when a platen 7 is reversed, a motor 13 is also rotated, and the preventing plate 12 closes the opening portion 4c. Accordingly, the recording sheet 3 is advanced along the outside of the preventing plate 12, so that the trailing end of the recording sheet is kept from contacting a cut sheet feeder not to cause wrinkles and folding.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording apparatus, and more particularly to a recording apparatus equipped with a cut sheet feeder.

[Summary of the Disclosure] This specification and the drawings describe a recording device that is equipped with a cut sheet feeder that can automatically feed cut sheets to a recording position and has a function to reversely feed the recording paper. By providing a reverse insertion prevention plate that connects the recording paper supply path to the part where paper is ejected to the device side and can be opened and closed via a link mechanism, the recording paper will not wrinkle or fold even when the recording paper is fed in the reverse direction. This invention discloses a technique that prevents such occurrences.

[Prior Art] One of the conventional methods of supplying cut sheets to a printer is to use a cut sheet feeder.

This cut sheet feeder stacks many sheets of recording paper cut to a certain size in layers, and automatically feeds the recording paper one by one to the vicinity of the printer's platen in synchronization with the movement of the recording device when feeding paper. It has a structure that supplies sheets one by one.

Cart/sheet feeders equipped with such an automatic paper feeding function reduce the operator's workload and are widely adopted.

In a conventional cut sheet feeder of this type, the recording paper is fed from the cut sheet feeder to a predetermined position near the platen of the device, and then the leading part of the recording paper is sent to the first printing position and set by rotating the platen. .

At this time, the rear part of the recording paper remains in contact with the ejection roller provided on the cut sheet feeder side, or even if it is not in contact with the ejection roller, it remains inside the cut sheet feeder case or paper feed tray. It's still there.

Therefore, this state will continue even if the recording device starts recording.

[Problems to be Solved by the Invention] By the way, after several lines have been recorded, if you want to add characters or make corrections to the part that has already been recorded, it is necessary to turn the recording paper in the opposite direction. When the recording paper is fed to the printer, the recording paper moves in the opposite direction at the platen portion of the apparatus, but cannot move because it is held down by the discharge roller at the cut sheet feeder section, which causes wrinkles, folds, or stains on the recording paper.

This phenomenon becomes more noticeable as the amount of recording paper fed in the reverse direction increases.

Also, even if the trailing edge of the recording paper is ejected from the cut sheet feeder, if you feed the recording paper in the opposite direction, the recording paper may get caught in a part of the cut sheet feeder case or hit the ejection roller. Similarly, wrinkles, creases, etc. occur.

Furthermore, in a recording device equipped with a cut sheet feeder, if you want to record on a recording paper of a size other than the paper set in the cut sheet feeder, you can do so by manually feeding the paper without using the cut sheet feeder. The recording paper is fed to the device, but if you record up to a certain part of the paper fed by manual feeding and then try to feed the recording paper in the opposite direction to make corrections or additional recording, the same recording will occur. The trailing edge of the paper gets caught in a part of the case of the cut sheet feeder, causing wrinkles, folds, etc.

As mentioned above, in a conventional recording device equipped with a cut sheet feeder, if the recording paper is fed in the reverse direction, the recording paper may wrinkle or fold, and the recording paper cannot be fed in the reverse direction, causing problems in the recording device. Many of the provided functions, such as automatic deletion, return to the top, and advance recording of layouts, could not be used, and the capabilities of the device equipped with these functions could not be fully utilized.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a reverse insertion prevention plate that connects the recording paper supply path to the portion of the cut sheet feeder that discharges the recording paper to the apparatus side. We adopted a structure in which it can be rotated freely via a link mechanism.

[Function] When the above-described structure is adopted, the reverse insertion prevention plate can prevent the recording paper from being reversely inserted into the feeder side, and the recording paper will not be wrinkled or folded.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

Figure 1 and the following diagrams explain one embodiment of the present invention.
The figure shows an electronic typewriter as an example of a recording device to which the present invention is applied.

In FIG. 2, reference numeral a indicates the main body of the electronic typewriter, and a cut sheet feeder b is provided at one end of the main body of the electronic typewriter.

On the other hand, main parts of the cut sheet feeder and the recording paper conveyance system are shown in FIG.

In FIG. 1, the reference numeral l indicates a discharge roller provided on the cut sheet feeder side, and a paper feed tray 2 is arranged below the discharge roller. are stored in layers.

These recording sheets 3 are constantly pressed toward the discharge roller 1 side by a spring or the like (not shown), and by utilizing the frictional force generated by the rotation of the discharge roller, the recording sheets 3 can be discharged one by one from above.

On the other hand, the reference numeral 4 indicates a part of the case on the cut sheet feeder side. A discharge tray 5 is arranged alongside and outside of the case 4 and separated by a predetermined distance.

The ejected recording paper 3 is supplied toward the platen 7 from the gap 4a between the lower end of the case 4 and the case 9 on the apparatus side along the slope of the case 9 on the apparatus side.

Feed rollers 8, 8 are rotatably pressed against the lower side of the platen 7 and spaced apart by a predetermined angle, and the recording paper 3 is guided between the platen 7 and the feed rollers 8, 8.

By the way, in the travel path of the recording paper 3, the paper sensor 6b
, 6a are provided.

One paper sensor 6b is provided on the upstream side of the travel path of the recording paper 3, and the other paper sensor 6a is provided below the platen 7.

A paper veil 10 is provided above the front side of the platen 7 in such a manner that it can be brought into pressure contact with the platen 7 and separated from the platen 7.

Also, above the platen 7 is a group of take-up rollers 1 for the recording paper 3.
1 are provided, and the recording paper after being recorded by the take-up roller group 11 is discharged into the paper discharge tray 5.

On the other hand, the one denoted by numeral 12 is a reverse insertion prevention plate, and is a side plate 4a on the ejection tray 5 side of the case 4 of the cart/sheet feeder.
It is rotatably supported via a shaft 12a so as to communicate with an opening 4c formed between the guide plate 4b and the guide plate 4b.

The reverse insertion prevention plate 12 has a length that is almost the same as the width of the paper feed tray 2, and has a width that can close the opening 4c, that is, the supply port for recording paper from the paper feed tray 2.

On the other hand, on one end side of the reverse insertion prevention plate 12 and on the paper feed tray 2
Place the stepping motor 13 in a position that does not interfere with the attachment and detachment of the
A pin 13b is provided protruding from an eccentric position of a disk 13a fixed to the output shaft, and a link is established between this pin 13b and a pin 12b protruding from the side edge of the reverse insertion prevention plate 12. They are rotatably connected by a lever 14.

Therefore, when the pin 13b is at the farthest position from the reverse insertion prevention plate 12 as shown in FIG. 1, the opening 4C is closed by the reverse insertion prevention plate 12; The insertion prevention plate 12 can be opened.

Note that when the reverse insertion prevention plate 12 is closed, its lower end is in contact with the upper end of the guide plate 4b.

On the other hand, FIG. 3 is a block diagram of a control circuit applied to the apparatus of the present invention. In the figure, the reference numeral 21 indicates a keyboard, which includes alphabet keys, a numeric keypad, and various symbol keys.

This keyboard 21 is connected to a control circuit 23 via line 1.
It is connected to the.

Also, the reference numeral 22 is a function keyboard section for inputting information regarding function operations such as space, carriage return, paper feed, automatic paper feed, etc., and mode settings such as margin set, tab set, and reset, which is controlled via line 12. It is connected to the circuit 23.

The control circuit 23 includes a ROM that converts microinstruction information for sequential control into digital signals, stores them, converts them, and discriminates the information, an arithmetic unit that performs arithmetic processing according to information from the ROM, and a register group that holds numerical data. , an adder for executing calculations, a control section for performing other controls, etc.

Reference numeral 24 is a memory for storing data regarding the amount of paper feed, and data is input from the control circuit 23 in response to a paper feed amount instruction signal input from the function keyboard section 22 to the control circuit 23 via line 12. The paper feed amount data or the paper feed amount data during automatic paper feeding is stored via the line 3 or output to the control circuit 23.

Reference numeral 25 indicates a drive circuit for the paper feed motor 26, which converts the paper feed motor drive signal pulse output from the control circuit 23 via the line 14 into a motor drive signal and amplifies the power.

The paper feed motor 26 is, for example, a stepping motor, which rotates at an integral multiple of the minimum feed amount in response to the number of pulses output from the drive circuit 25 via the line j5, and causes the gear system 27 to rotate. The rotational force is transmitted to the platen 7 that feeds the recording paper 3.

A carriage 30 is equipped with a type unit hammer, an ink ribbon, etc., and records while moving parallel to the platen 7.

Reference numeral 33 denotes a drive circuit for the motor of the discharge roller of the cut sheet feeder, which drives the discharge motor 34 based on commands from the control circuit 23.

Further, reference numeral 31a is an amplifier circuit for the paper sensor 6a.

32b is an amplification circuit of the paper sensor 6b, and the amplified signal is input to the control circuit 23.

Next, the automatic paper feeding operation of this embodiment configured as above will be explained with reference to the flowchart of FIG. 4.

That is, when the apparatus enters the automatic paper feeding mode using the cut sheet feeder, in step St, the control circuit determines whether the recording paper 3 is set between the platen 7 and the feed roller 8 based on the signal from the paper sensor 6a. Determine φ.

If recording paper is set, rotate the platen 7 in the forward direction (clockwise in FIG. 1) (step S).
2).

On the other hand, if no recording paper is set, step S
At step 3, the discharge roller l of the sheet feeder is rotated to feed the recording paper until it contacts the platen 7 and the feed roller 8.

At this time, the stepping motor 13 is
is rotated 180 degrees from the state shown in FIG. 1, the link lever 14 is advanced, and the reverse insertion prevention plate 12 is rotated clockwise in FIG. 1 to open the opening 4c.

On the other hand, since the amount of rotation of the discharge roller 1 is preset so that the leading edge of the recording paper conveniently contacts between the platen 7 and the feed roller 8, the recording paper is delivered by a predetermined amount.

Next, in step S4, the paper sensor 6b detects whether or not recording paper is detected. If no recording paper is supplied, a warning is issued by sound or light in step S5.

On the other hand, if recording paper is detected in step S4, the carriage 30 is moved to the center of the recording paper in step S6, the paper bail 10 is separated from the platen 7, the stepping motor 13 is energized, and the bin 1 is moved to the center of the recording paper in step S6.
3b is rotated so that it is in the direction farthest from the reverse insertion prevention plate 12 as shown in FIG. 1, and the opening 4C is closed.

In this state, in step S7, the platen 7 is rotated in the forward direction and the recording paper is wound around the platen 7.

When the leading edge of the recording paper reaches a position where it is sandwiched between the paper veil 10 and the platen 7, step S
At step 8, the paper veil to is moved and brought into contact with the platen 7 with the recording paper sandwiched therebetween.

It is assumed that the first printing position on the supplied recording paper has already been input and determined by the operator or the like.

Recording is started in this state, but during step S9
Monitoring by the paper sensor 6b continues (step 59'), and recording paper is detected.

If the recording paper is no longer detected by the paper sensor 6b and it is necessary to reverse the recording paper due to correction or other reasons, the stepping motor 13 is turned on again in step 510 in order to reverse the recording paper. 180
Rotate once to close the reverse insertion prevention plate 12 and rotate the platen 7 in the reverse direction.

Note that the first UIIJ shows a state in which the paper sensor 6b cannot detect the recording paper.

In this state, the rear end of the recording paper 3 is completely connected to the reverse insertion prevention plate 12.
away from

By the way, when the platen 7 is rotated in the opposite direction, the rear end of the recording paper 3 is sent in the opposite direction as shown by the dotted line 16 in FIG.
Since the reverse insertion prevention plate 12 is closed, it does not enter the inside of the cut sheet feeder, but proceeds along the outer slope of the reverse insertion prevention plate 12, and fills the space between the case 4 of the cut sheet feeder and the discharge tray 5. (This space is for manual feed).

Then, when the recording paper returns to the target position, for example, the initial recording position, the rotation is stopped, and the carriage is returned to a predetermined position in step Sll, thereby terminating the automatic paper feeding control.

In this way, even when the recording paper is fed in reverse, the trailing edge of the recording paper does not come in contact with the cut sheet feeder side and wrinkles or folds occur, and the reverse feeding can be performed smoothly. Able to fully demonstrate their abilities.

Furthermore, in the embodiment described above, the presence or absence of recording paper is determined by the paper sensor 6a, but at the beginning of automatic paper feeding, the paper sensor 6b determines the presence or absence of recording paper, and the paper sensor 6b detects when there is no recording paper. After detecting the
If the recording paper is rotated in the forward direction, the recording paper is ejected to the paper ejection tray 5 side, so the paper sensor 6a can be made unnecessary.

Furthermore, in the embodiment described above, the recording paper is completely ejected from the inside of the cut sheet feeder to the outside of the cut sheet feeder each time paper is fed, but it is not necessary to reverse feed the recording paper during recording. If not, the reverse feeding operation of the recording paper may not be performed as explained in steps 39 and 510 in FIG.

Furthermore, depending on the type of recording apparatus, when the recording paper is fed backwards by approximately 1.2 lines, the recording paper may only sag, but no wrinkles may occur.

In such a case, for example, it is sufficient to set the reverse feed operation to be performed only when three or more lines are reversely fed, that is, when there is a risk of wrinkles occurring.

Of course, not only when recording paper is fed from the cut sheet feeder, but also when manually feeding the recording paper, there is no possibility that the recording paper will be wrinkled or folded during reverse feeding.

[Effects] As is clear from the above explanation, according to the present invention, a structure is adopted in which a reverse insertion prevention plate is provided that can open and close the gap portion of the cut sheet feeder that discharges the recording paper. Even if the recording paper ejected from the feeder side is fed backwards, the trailing edge of the recording paper will not get caught in the sheet feeder side by force, there will be no wrinkles or folds, and the function of the automatic paper feeder will be fully utilized. It can be demonstrated.

[Brief explanation of the drawing]

The figures are for explaining one embodiment of the present invention.
3 is a block diagram of the control circuit, and FIG. 4 is a flowchart explaining the control operation. 2... Paper feed tray 4... Cases 6a, 6b.
... Paper sensor 7 ... Platen 12 ... Reverse insertion prevention plate 13
...Stepping motor 13a...Disk 13b...Bin 14...
link lever

Claims (1)

[Scope of Claims] 1) In a recording device that is equipped with a cut sheet feeder that can automatically feed cut sheets to a recording position and has a mechanism that reversely feeds the recording paper, the recording paper of the cut sheet feeder is placed on the device side. 1. A recording device characterized in that a reverse insertion prevention plate is provided in an opening for discharging the liquid, so that the plate can be opened and closed via a link mechanism between a closed state and an open state of the opening. 2) The recording apparatus according to claim 1, further comprising a function of supplying recording paper from a cut sheet feeder and manually feeding recording paper.