JP3102061B2 - Printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer provided with a paper bail for pressing printing paper against a platen.

[0002]

2. Description of the Related Art Conventionally, when the same printing is performed on two or more sheets, printing is performed by superimposing copying paper (pressure-sensitive paper) on the printing paper. Further, depending on the paper type, there is also a paper in which only the upper ends of two or more sheets are glued (hereinafter referred to as “backing paper”). In this case, FIG.
As shown in FIG. 1A, printing is performed by a print head 4 in a state where two or more sheets of printing paper 1 are set on a platen 2 and pressed by a paper bail 3.

[0003]

In the above-mentioned conventional configuration, the paper bail 3 is always kept in a state where the printing paper 1 is pressed against the platen 2 even during paper feeding. As the paper feed amount increases, FIG.
As shown in (b), the feeding of the first printing paper 1a is likely to be gradually lifted up due to the pressing frictional force of the paper bail 3. In this state, if the paper feeding operation is continued, the raised portion of the first printing paper 1a comes into contact with the ink ribbon 5, and the printing paper 1a becomes dirty or the printing paper 1a becomes wrinkled. In some cases.

[0004] The present invention has been made in view of such circumstances, and an object thereof is to suppress the lifting of the first printing paper even when printing is performed by printing two or more printing papers. It is an object of the present invention to provide a printer which can prevent the first printing paper from being stained or wrinkled by the ink ribbon.

[0005]

According to a first aspect of the present invention, there is provided a printer provided with a paper bail for pressing a printing paper on a platen, wherein an opening and closing drive means for driving the paper bail to open and close is provided. Selecting means for selecting whether or not to open and close the paper bail intermittently by the opening and closing drive means, and control means for controlling the opening and closing drive means based on the selection of the selection means.
In addition, the selecting means comprises a plurality of printing papers.
Multi-paper print mode that prints on a recording medium
Sometimes the paper bail is driven by the open / close drive
Select for intermittent opening / closing operation for single sheet printing
Single paper printing for printing on paper recording media
In the mode, the paper bail is moved by the opening / closing drive
Configuration to select not to open and close intermittently by step
It is characterized by

Further, the printer according to claim 2 of the present invention, prior to
The paper bail is driven by the opening / closing drive means during paper feeding.
And the opening / closing drive means is moved to the multi-paper printing mode.
Paper bay in the opening operation when feeding paper
The distance the printer is separated from the platen is
Release of the paper bail from the platen during cropping
It is configured to be smaller than the distance .

Further, the printer according to claim 3 of the present invention is a printer
A paper bail that holds the printing paper against the Latin
The paper feeder is configured to be able to reciprocate in the direction
A print head that is moved to one end in the movement direction.
Opening and closing drive means for opening and closing the paper bail
When the paper is fed, the paper bail is opened and closed.
Means to open or close intermittently by means
Selection means and the opening / closing drive based on the selection of the selection means.
Control means for controlling the moving means.
When the paper is fed, one end of the
The other end is farther away from the platen than the other end.
Der those configured to be opened operated urchin inclined
You.

[0008]

According to the first aspect of the present invention, a plurality of printers are provided.
In the paper printing mode, the control means intermittently causes the opening / closing drive means to open the paper bail when feeding paper during the printing operation. Thus, every time the paper bail is released, the pressing friction paper bail with respect to the print sheet is released, among the plurality of printing paper
Of the first printing paper can be suppressed. In the single paper printing mode, the control means
Opens and closes the paper bail when feeding paper during printing
Do not open by the drive means. That is, even if the paper bail is always pressed against the platen during paper feeding, there is no danger that the printing paper will rise.
When printing on a sheet of printing paper hurt, because the intermittent opening and closing of the paper bail is omitted, it is possible to increase the speed of the feed speed of the sheet (printing speed).

According to a second aspect of the present invention, there is provided a printer.
For example, when opening the paper bail in multiple paper printing mode
Distance of the paper bail from the platen at
Since the paper separation distance is smaller than the paper feeding distance,
The print head does not get in the way during the opening operation of the
There is no need to evacuate the pad. Also, when opening
Paper bail because of the small distance from the platen
The time required for opening and closing the paper can be shortened.
Printing speed due to intermittent opening and closing of the file
The lower part can be suppressed as much as possible .

Further, according to the printer of claim 3 of the present invention,
For example, depending on the selection means, the paper bail can be
Selectable to open and close intermittently by opening and closing drive means
The control means feeds the paper during the printing operation.
In this case, the paper bail is intermittently
Release operation. This opens the paper bail
Each time the paper bail is pressed against the printing paper.
Since the rubbing force is released, for example, two or more printing papers
Intermittent paper during paper feed
Opening the bail to lift the first printing paper
Can be suppressed. Further, the paper feeding is performed by the selecting means.
The paper bail intermittently
If you choose not to open and close the
Opening operation of the paper bail by opening and closing drive means during operation
The paper is fed without letting it go. Therefore, the printing paper floats
Print on a single sheet of printing paper, for example, without risk of rising
Omit the intermittent opening and closing of the paper bail.
Thus, the printing speed can be increased. Moreover,
When printing on paper, avoid the print head located at one end in the movement direction.
Open the paper bail in an inclined manner so that
The print head is not disturbed during the opening operation when feeding paper.
There is no evil.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 3, a platen 13 is attached to the main body frames 11 and 12 on both the left and right sides of the printer.
4 so as to be rotatable. A carriage 15 is provided in front of the platen 13 so as to be able to move parallel to the left and right. A print head 16 is mounted on the carriage 15 so as to face the platen 13, and ink is supplied between the print head 16 and the platen 13. Ribbon (not shown)
Is set. Also, the carriage 1
5 is provided with a paper guide 18 for guiding a print sheet (not shown) set on the platen 13.
The platen 13 is rotated by a paper feed motor 40 shown in FIG. 7 in conjunction with a known paper feed device.

On the other hand, a paper bail 19 for pressing the printing paper against the platen 13 has an arm 2 rotatably supported on the body frames 11, 12 via shafts 20a, 20b.
1 and 22; a shaft 23 horizontally inserted and supported at the upper ends of the arms 21 and 22; and a plurality of rollers 24 rotatably inserted through the shaft 23. Springs 25 and 26 (FIG. a) and (b)).

As shown in FIG. 1B, the opening / closing drive means 27 for driving the paper bail 19 to open / close drives the rotational force of a driving gear 28a rotating with a pulse motor 28 as a driving source, into three gears 29a, 29b. , 29c to the camshaft 30, whereby the left and right cams 31, 3 are transmitted.
2 to rotate the contacts 2 on the left and right arms 21 and 22
By causing the cams 1a and 22a to perform a cam motion, the arms 21 and 22 are opened and closed and rotated.

In this case, the shapes of the left and right cams 31 and 32 are different as shown in FIGS. 1 (a) and 1 (b).
When the paper is fed in the printing operation, the cams 31 and 32 are moved from the closed position (home position) in FIG. 2, the arms 21 and 22 are slightly opened, and the roller 24 of the paper bail 19 is slightly separated from the platen 13 (half-open state) as shown in FIG. ). This half-open state is instantaneously released (for example, within one second), and the paper bail 19 is immediately returned to the original closed position. The paper feed amount detecting means employs a photo interrupter 42 (see FIG. 7) for detecting rotation of an encoder 41 that rotates in synchronization with the platen 13.

On the other hand, at the time of paper feeding, the cams 31 and 32 are moved from the closed position in FIG.
Reverse rotation. As a result, the left arm 21 is
Opened at the same angle as above as shown in (a),
The right arm 22 is largely opened as shown in FIG. 4B, and the paper bail 19 is opened in a tilted manner as shown in FIG. 5 (full open state). As described above, the reason for opening the paper bail 19 in an inclined manner during paper feeding is as follows.
At the time of paper feeding, the paper bail 19 is opened while the print head 16 is moved to the left end, so that the left side of the paper bail 19 cannot be widely opened because the print head 16 is in the way.

The left cam 31 is provided with a position detecting cam 33. The position detecting switch 34 is turned on / off by the position detecting cam 33 to detect a closed position, a half open position, and a full open position. Thus, the pulse motor 28 for driving the paper bail 19 is stopped.

The print head 16, the pulse motor 28,
Electronic devices such as the paper feed motor 40 and the photo interrupter 42 are connected to a microcomputer 43 (see FIG. 7) having a known one-chip microcomputer as a core. In addition, the microcomputer 43 is connected to a console panel 44 including a switch 44a serving as a selection means for switching between a mode for printing on normal paper and a mode for printing on backing paper.

Next, the control of the printing operation will be described. In the printing mode for the normal paper, the operation of the printer is no different from that of the conventional printer. Only the case where the execution mode is selected will be described with reference to the flowchart of FIG. That is, the process waits until there is a print command (step S1). If there is a print command, the paper feed amount by the paper feed operation is, for example, 2.5 inches (6.2).
5 mm) is determined (step S2).
At this time, if the paper feed amount does not exceed 2.5 inches, the print head 16 is driven to print one line on the print paper (step S7).

On the other hand, if the paper feed amount exceeds 2.5 inches due to the subsequent paper feed operation, it is determined (YE) in step S2.
S), the process proceeds to step S3, where the ink ribbon (not shown) is shifted to the lowermost position (initial position), and then the pulse motor 28 (for example, 48 steps / 1)
(Step S4). Thereby, the cams 3 on both the left and right sides
1 and 32 are rotated by about 90 ° in the direction of arrow A, which is the normal rotation direction, from the closed position (home position) in FIG.
As shown in (2), the arms 21 and 22 are slightly opened, and the roller 24 of the paper bail 19 is slightly separated from the platen 13 (half open state). In this state, the pressing frictional force of the roller 24 of the paper bail 19 against the printing paper is released, so that even when printing is performed with two or more printing papers stacked, the first printing paper can be prevented from rising. .

Immediately after the paper bail 19 is half-opened in this way, the pulse motor 28 is immediately moved to its original position by 51%.
Step reverse rotation (step S5). This allows
The half-open state of the paper bail 19 is instantaneously released (for example, within one second), the paper bail 19 is immediately returned to the original closed position, and the printing paper is pressed against the platen 13 again.

Thereafter, the ink ribbon is shifted to the original position (step S6), and the printing operation for one line is executed (step S7). In this case, if the line feed of the printing paper ends at the same time when the paper feed amount exceeds 2.5 inches, in step S7, the print head 16 is immediately driven to perform printing. First, platen 1
After the line feed is completed by rotating the print head 3, the print head 16 is driven to perform printing.

When the mode for printing on normal paper is selected by the switch 44a, the operations in steps S2 to S6 are omitted. For this reason, the printing speed (paper feed speed) is somewhat higher than in the above mode.

According to the above embodiment, each time the paper feed amount of the printing paper exceeds 2.5 inches, the paper bail 1
9 is momentarily opened halfway, so that the friction force of pressing the paper bail 19 against the printing paper can be released each time. Therefore, even when printing is performed on two or more sheets of backing paper, the first printing paper can be prevented from rising, and the first printing paper can be prevented from contacting the ink ribbon. Dirt and wrinkling of the second printing paper can be prevented.

The intermittent opening of the paper bail 19 at the time of feeding the paper is not full opening but half opening. Therefore, the paper bail 19 is employed in a device which retracts the print head in order to fully open the paper bail during paper feeding. However, there is also an advantage that the print head 16 does not hinder the intermittent operation of the paper veil, and it is not necessary to retract the print head 16.

However, in the present invention, the paper bail 19 may be intermittently "fully opened" during paper feeding, and the intended object of the present invention can be sufficiently achieved even in this case.

In the above embodiment, the paper bail 1
Although the opening timing of No. 9 is controlled by the paper feed amount, this may be controlled by the paper feed operation time. Further, the print mode may be switched by a command from the host computer.

In addition, the present invention provides, for example,
Various modifications are possible, for example, the present invention can be applied to a model having a different configuration of FIG.

[0028]

As is apparent from the above description, the printer according to the first aspect of the present invention operates in the plural paper printing mode.
, At the time of paper feeding, intermittently, by opening operation of the paper bail, each time, it is possible to release the pressing friction paper bail with respect to the print sheet, of a plurality of sheets of printing paper 1 The lifting of the first printing paper can be suppressed, and the first printing paper becomes dirty.
Wrinkles and wrinkles can be prevented. Also, paper feed
Single paper stamp that does not cause the printing paper to rise
In character mode, the paper bay
The paper feed speed is
(Printing speed) can be increased .

Further , the printer according to the second aspect of the present invention has a
When opening the paper bail in several paper printing mode
The distance that the paper bail is separated from the platen
By making it smaller than the separation distance at the time of
The print head is not in the way when opening the bail
No need to retract the print head
The advantage is obtained. In addition, during opening operation,
Opening and closing of the paper bail due to the small distance from the ten
Since the time required for operation can be shortened, paper bale
Extremely low printing speed due to intermittent opening and closing
Can be suppressed .

Further, according to the third aspect of the present invention, the printer
When feeding, the paper bail is opened intermittently.
Each time, the paper for the printing paper
-Since the pressing frictional force of the bail can be released,
Even when printing two or more character sheets, the first sheet
The first sheet of paper can be prevented from rising
Can prevent the printing paper from becoming dirty or wrinkled.
You. In this case, the paper veil is selected by the selection means.
It is possible to freely select whether or not to open intermittently.
The paper bail can be used, for example, for the type of printing paper.
An appropriate operation according to the type and the number of sheets can be performed.
In addition, when feeding paper, open the paper bail in an inclined manner.
Make the paper easier to handle.
The print head gets in the way when the paper bail is opened.
Can be prevented.

[Brief description of the drawings]

FIG. 1 is a left side view (a) and a right side view (b) of an opening / closing drive unit when a paper bail is in a closed position (home position).

FIG. 2A is a left side view and FIG. 2B is a right side view of the opening / closing drive unit when the paper bail is in a half-open position.

FIG. 3 is a plan view of a main part when the paper bail is in a closed position (solid line) and a half-open position (two-dot chain line).

FIG. 4A is a left side view and FIG. 4B is a right side view of the opening / closing drive unit when the paper bail is in a fully open position.

FIG. 5 is a plan view of a main part when the paper bail is in a fully open position.

FIG. 6 is a flowchart showing control contents.

FIG. 7 is a block diagram illustrating an electrical configuration.

FIG. 8 is a side view of the vicinity of a platen illustrating a conventional example.

[Explanation of symbols]

13 is a platen, 15 is a carriage, 16 is a print head, 19 is a paper bail, 21 and 22 are arms, 2
7 is an open / close drive means, 28 is a pulse motor, 31 and 32
Is a cam.

Claims (3)

(57) [Claims] 1. A printer provided with a paper bail for pressing a printing paper against a platen, comprising: an opening / closing drive unit for opening and closing the paper bail; and an intermittent opening / closing unit for opening and closing the paper bail when feeding paper. Selecting means for selecting whether or not to operate, and control means for controlling the opening / closing drive means based on the selection of the selecting means , wherein the selecting means is a recording medium comprising a plurality of print sheets.
When in the multi-paper print mode that prints on the
Open and close the paper bail intermittently by the open / close drive means
Selected to operate, a single print sheet
In single-sheet print mode for printing on recording media
Intermittently by the open / close drive means
A printer characterized in that the printer is selected so as not to be opened and closed . 2. The paper bail is provided with a paper bale when feeding paper.
The opening / closing driving unit is opened by the opening / closing driving unit, and the opening / closing driving unit is configured to perform a paper feeding operation in a multi-paper printing mode.
The platen of the paper bail in the opening operation of
Distance from the paper in the opening operation during paper feeding.
-Less than the separation distance of the par veil from the platen
2. The method according to claim 1, wherein
The printer described. 3. A paper for pressing printing paper against a platen.
-Bail and reciprocable in the direction perpendicular to the paper feed direction
It is moved to one end in the movement direction when feeding paper
In printers with a print head, a closing drive means for opening and closing said paper bail, said opening and closing means the paper bail when paper feeding
Option to select whether to open or close intermittently
And controlling the opening / closing drive means based on the selection of the step and the selection means.
Holders of Bei and control means Gosuru, the paper bail is in said opening and closing drive means when the paper feed
The other end of the platen is larger than the one end of the platen.
It is characterized in that it is opened in an inclined manner so as to be separated from each other.
And the printer.