JPH0698801B2 - How to locate the print media of a printer - Google Patents

Description

The present invention relates to a print medium cueing method in a serial printer or the like.

[Conventional technology]

Regarding the feeding of a print medium (single sheet) in a printer such as a serial printer, there is a technique as disclosed in Japanese Patent Laid-Open No. 61-102280, which will be described below with reference to the drawings.
5 is a disassembled perspective view, FIG. 6 (I) is a perspective view when inserting from above, FIG. 6 (II) is a perspective view when inserting from below, and FIG. 7 is a sectional view. In FIG. 1, 1 is a printer, 2 is a platen, 3 is a knob for rotating the platen 2, 4a and 4b are press rollers for sending a printing medium by pressing against the platen 2, and 5 is a lever of the press rollers 4a and 4b. Perform pressure contact / separation.

Reference numeral 6 is a print head, and 7 is a print medium, which is a single sheet.

A bail arm roller 8 presses the printing medium 7 printed by the printing head 6 against the platen 2. Reference numeral 9 is a bail arm lever that presses and separates the bail arm roller 8 from each other.

10 is a paper separator, 11 is a medium insertion guide device, 12
Is a print medium detection device (referred to as PE sensor) for detecting the presence or absence of the print medium 7, and is provided on the substrate 13.

14a and 14b are PE levers of the PE sensor 12, 15a and 15b are rotation fulcrums of the PE levers 14a and 14b, and 16 is a support bracket.

In the above apparatus, in order to set the print medium 7 to the first print position (hereinafter referred to as "cueing"), there are two types of insertion routes of the print medium, as shown in FIGS. 6 (I) and (II). In the case of, also insert the printing medium 7 by hand, and
When sandwiched between the platen 2 by 4a and 4b, the operator turns the knob 3 to feed the print medium 7. When the leading edge of the fed print medium 7 passes the print head 6, the bail arm lever 9 is pulled to move the bail arm roller 8 to the platen 2.
Away from the print medium 7, the print medium 7 is fed by rotating the knob 3, the print medium 7 is passed through the bail arm roller 8, and when the print is finished, the bail arm lever 9 is returned to return the bail arm roller 8 to the print medium 7. As a result, the print medium 7 is brought into pressure contact with the platen 2, positioning is completed, and printing can be performed.

[Problems to be solved by the invention]

According to the conventional technique described above, the print medium is cueed manually by the operator, so that there is a problem that the operator has to perform the above operation every time the print medium is replaced.

[Means for solving problems]

The present invention has a print medium detecting device that provides two routes for inserting a print medium and detects the insertion of each route.
In a printer in which a bail arm roller that presses and separates a print medium from a platen is opened and closed by a bail arm lever, a bail arm switch that operates by an opening and closing operation of the bail arm lever is provided. .

[Work]

According to the present invention described above, the bail arm switch is operated by the opening / closing operation of the bail arm lever, the opening / closing of the bail arm switch is detected, and the printing medium from which of the two insertion routes the printing medium is fed is printed. It is possible to position the print media from both insertion routes at the same position and perform a predetermined cue by detecting with a detection device and feeding the print medium by rotating the platen by a predetermined amount accordingly. .

〔Example〕

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

FIG. 4 is a side view of the main part, and the other parts are the same as those in the above-described conventional art, and therefore, will be described with the same reference numerals.

In the figure, 9 is a bail arm lever, which has a bail arm roller 8, rotates about a fulcrum 17, and has an end facing the bail arm switch 18. Therefore, by operating the bail arm lever 9, the bail arm roller 8 can be pressed against and separated from the platen 2, and at the same time, the bail arm switch 18 is turned off and on.

Figure 1 is a block circuit diagram. ΜCPU19 is ROM20, RAM2
1, the motor driver 22, the PE sensor 12, the bail arm switch 18, and the address / data bus line 23 are connected.

The motor driver 22 drives the platen 2 to rotate.
The LF motor 24 is connected.

The μCPU 19 detects the state of the PE sensor 12 and the bail arm switch 18 in the offline state, and sends a control signal to the motor driver 22 by the program in the ROM 20.
By driving the LF motor 24, the print medium 7 can be fed to a predetermined position for cueing.

The control method will be described in detail with reference to the time chart of FIG. 2 and the flow chart of FIG.

In FIG. 2, PES represents the state of the PE sensor, and the high level indicates the state where there is no print medium, and the low level indicates the state where there is the print medium. Here, the presence or absence of the print medium means whether or not the print medium 7 pushes the PE lever 14b in FIG.

BAS represents the state of the bail arm switch 18,
A high level represents a state in which the bail arm lever 9 is opened, and a low level represents a state in which the bail arm lever 9 is closed.

LFM represents the state of the LF motor 24, where the high level represents the rotating state and the low level represents the stopped state.

FIG. 2 (I) shows the case of the print medium insertion route of FIG. 6 (I), in which the print medium 7 is set at the position indicated by A in FIG. 7 while the printer 1 is powered on. When the print medium 7 is a single sheet, the pressure roller lever 5 is closed, and the pressure roller 4 is pressed against the platen 2, so that the print medium 7 hits the pressure roller 4a and stops.

Therefore, since the PE lever 14a is not pushed in the set state of the print medium, the PES is at a high level without the print medium. In this state, when the operator opens the bail arm lever 9 and changes BAS from low level to high level, μC
The PU 19 rotates the LF motor 24 through the motor driver 22. Since the platen 2 rotates clockwise in FIG. 7 by the rotation of the LF motor 24, the print medium 7 is sandwiched between the pressure roller 4a and the platen 2 and sent out (S1 in FIG. 3).
~ S5).

Eventually, the tip of the print medium 7 is pushed by pressing the PE lever 14a
ES changes to low level.

When the µCPU 19 detects that the PES has changed to the low level, the distance L1 to the print start position of the print medium 7 (point S in Fig. 7)
Drives the LF motor 24 and stops the platen 2 (S6 ~ S
9).

After that, the operator closes the bail arm lever 9 to finish the cueing operation of the print medium 7 (S10).

After that, even if the bail arm lever 9 is accidentally or intentionally opened, the μCPU 19 stores the number of times of cueing 1 for cueing the print medium 7 once, so the LF motor 24 is not driven, and the cue position is set. There is no deviation.

FIG. 2 (II) shows the case of the print medium insertion route using the medium insertion guide device 11 of FIG. 6 (II). In this case, when the operator sets the print medium 7 as shown in FIG. 7B, the leading end of the print medium 7 comes into contact with the pressure roller 4b and stops, and the PE lever 14b is pushed.
Goes low. When the operator opens the bail arm lever 9 in this state, BAS changes from the low level to the high level, and the μCPU 19 drives the LF motor 24 by the distance L2 to the print medium cue position S point to stop the platen 2 ( S11 ~ S13).

After that, it is the same as the above case and the operator closes the bail arm lever 9 and ends, and even if the baim room lever 9 is opened again, the μCPU 19 once cues the print medium 7 and memorizes the cue count 1 LF motor 24
Is not driven, and the cue position does not shift.

In the embodiment described above, the method of detecting the print medium existing in the two types of medium insertion routes is detected by the one PE sensor 12 and the two PE levers 14a and 14b. It goes without saying that the same thing can be found by using one of them.

〔The invention's effect〕

According to the present invention described in detail above, by providing the bail arm switch that detects the opening and closing of the bail arm lever that causes the bail arm roller to contact and separate from the platen, it is only necessary to operate the bail arm lever for a print medium having a different insertion route. With this, it is possible to semi-automatically move to the same position, and there is an effect that the troublesomeness of an operator performing the adjustment work of the head is eliminated.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing an embodiment of the present invention, and FIG.
Fig. 3 is a time chart, Fig. 3 is a µCPU control flow chart, Fig. 4 is a side view showing an example of a bail arm switch, Fig. 5 is a disassembled perspective view of a printer and medium insertion guide device, and Fig. 6 is printing. FIG. 7 is a perspective view of a medium insertion route, and FIG. 7 is a sectional view. 1 ... Printer, 2 ... Platen, 4a, 4b ... Presser roll, 6 ... Printing head, 7 ... Printing medium, 8 ...
Bail arm roller, 9 ... Bail arm lever, 11 ...
… Medium insertion guide device, 12 …… PE sensor, 14a, 14b …… P
E lever, 18 …… Bail arm switch, 19 …… μCPU,
24 …… LF motor

Claims (1)

[Claims] 1. A first insertion route in which a first print medium is inserted, a second insertion route in which a second print medium is inserted, and a first insertion route inserted from the first insertion route. A first pressure roller for sandwiching the print medium between the platen,
A second pressure roller for sandwiching the second print medium inserted from the second insertion route or the first print medium sent via the first pressure roller with the platen, and a bail arm lever. A print medium cueing method for a printer having a bail arm roller that presses and separates the print medium from and into the platen by opening and closing the print medium, wherein the second print medium passes through the first insertion route and the second pressure roller. Has a means for detecting the second print medium before coming into contact with, and the bail arm roller is separated from the platen when the second print medium is not detected in the off-line state. In the meantime, a setting is made such that the head of the first print medium exceeds the position between the platen and the bail arm roller from the position where the first print roller comes into contact with the first pressure roller. Performs control for the first distance delivery to the position, when the detection is of the second print medium, while the bail arm roller is separated from the platen,
Control is performed to feed the second distance from the position where the head of the second print medium is in contact with the second pressure roller to the set position that is between the platen and the bail arm roller. Accordingly, the print medium from the both insertion routes is set to a common cue position, and the print medium cue method for a printer is characterized.