JP2591532B2 - Printer device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer device capable of eliminating color misregistration due to eccentricity or dent of a platen roller.

[Prior Art] The configuration of a conventional example will be described with reference to FIG.

FIG. 3 is a side view schematically showing a mechanical part of a conventional printer, for example.

In FIG. 3, (1) is a platen roller, (2) is a pulley, (3) is a timing belt, (4) is a pulley, (5) is a pulley, (6) is a sheet, (7) is an ink sheet, (8) is a thermal head, (9) is a clamper, (10) is a paper transport guide, (11) is a clamper opening / closing mechanism, (12) is a pickup roller, (13) is a paper cassette, and (14) is a paper discharge transport. Path, (15a) and (15b) are discharge rollers, PH1 is a print start position sensor, PH2 is a paper presence / absence sensor in the clamper, PH3 is a clamper open / close position sensor, PH4 is a leading / rear end sensor, and PH5 is a paper cassette presence / absence. It is a sensor.

Next, the operation of the above-described conventional example will be described with reference to FIG.

FIG. 4 is a flowchart showing the operation of the conventional printer.

The printing start position of each color is defined as a position where the printing start position sensor PH1 detects the presence of the clamper (9) and then the paper presence / absence sensor PH2 in the clamper detects the presence of the paper (6).

Therefore, at the start of printing, the position of the platen roller (1) in contact with the resistance value (heat line) of the thermal head (8) was different for each color.

That is, in step (20) of FIG. 4, the pickup roller (12) and the paper transport guide (10)
The paper (6) is fed from the paper cassette (13).

In step (21), the platen roller (1) is driven until the printing start position sensor PH1 indicates that there is a clamper.

In step (22), the platen roller (1) is driven until the sheet presence sensor PH2 in the clamper indicates that there is a sheet.

 In step (23), one color printing is performed.

In step (24), it is determined whether or not all colors (eg, cyan, yellow, magenta, etc.) have been printed. If NO, the process returns to step (21) to print another color, and YES In this case, the paper (6) printed in the next step (25) is transferred to the discharge conveyance path (14) and the discharge roller (15).
Paper is discharged through a) and (15b).

[Problems to be Solved by the Invention] In the conventional printer described above, if the platen roller (1) has eccentricity or dent, the platen roller comes into contact with the resistance value (heat line) of the thermal head (8). Since the position of (1) will be different for each color,
There is a problem that color shift occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and has as its object to provide a printer device that can eliminate color misregistration even if the platen roller has eccentricity or dents.

Means for Solving the Problems A printer device according to the present invention is installed at the tip of a platen roller and detects whether or not a clamper is provided on a timing belt wound around a pulley coaxial with the platen roller. A start position sensor, installed between the platen roller and the printing start position sensor, a sheet presence sensor in the clamper for detecting the presence or absence of a sheet sandwiched by the clamper, after the printing start position sensor detects the presence of the clamper, In a printer device that includes a CPU that starts printing from a position where the paper presence / absence sensor in the clamper detects the presence of paper, and that performs color printing by rotating the clamper according to the number of colors, the printer is installed in front of the platen roller. Further comprising a clamper open / close position sensor for detecting the presence or absence of the clamper, wherein the CPU After printing the previous color, drive the platen roller until the clamper opening / closing position sensor detects the presence of the clamper, store the drive amount of the platen roller from the start of printing to the present, and store the next color. In printing, a correction drive amount is calculated so that the position of the platen roller is the same as the position at the start of printing of the previous color, and the platen roller is fed by the correction drive amount.

[Operation] In the present invention, the presence or absence of a clamper is detected by a clamper opening / closing position sensor installed in front of the platen roller. Further, after printing the previous color by the CPU, the platen roller is driven until the clamper opening / closing position sensor detects the presence of the clamper, and the driving amount of the platen roller from the start of printing to the present time is stored. When printing a color, the correction driving amount is calculated so that the position of the platen roller becomes the same as the position at the start of printing of the previous color, and the platen roller is fed by the correction driving amount.

Embodiment The configuration of an embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a block diagram showing an embodiment of the present invention, and the contents of a mechanical portion (30) are exactly the same as those of the above-described conventional device.

In FIG. 1, (31) is the I / O interface, (3)
2) is a CPU (Central Processing Unit) connected via a bus, (33) is a ROM in which software and the like are registered,
(34) is a RAM in which data and the like are stored.

Next, the operation of the above embodiment will be described with reference to FIG.

FIG. 2 is a flowchart showing the operation of one embodiment of the present invention.

When the platen roller (1) is driven, how much the platen roller (1) is driven is stored in the RAM (34), and as shown in FIG. The correction drive amount is calculated so that the position of the platen roller (1) at the start of printing is the same at the position where the presence is detected, and only the platen roller (1) is driven to perform the idle feeding. When the clamper opening / closing position sensor PH3 has the clamper (9), the paper (6)
Can be driven without moving the platen roller (1).

For example, when the number of pulses for one rotation of the platen roller (1) by the pulse motor is 1000, the driving amount of the platen roller (1) at the position where the clamper opening / closing position sensor PH3 detects the presence of the clamper (9) is 3776. Sometimes, the number of pulses is driven by 224.

That is, steps (40) to (44) and step (47) in FIG. 2 are the same as the conventional steps (20) to (25).

In step (45), the clamper opening / closing position sensor
The platen roller (1) is driven until PH3 has the clamper (9).

In step (46), a correction drive amount for positioning the platen roller (1) is calculated from the drive amount of the platen roller (1) from the start of printing to the present time, and the platen roller (1) is driven. Return to).

According to one embodiment of the present invention, as described above, the position of the platen roller (1) at the start of printing is the same.
Since the position of the platen roller (1) is adjusted for each color, the platen roller (1) can be mounted without attaching a sensor for detecting the fixed position of the platen roller (1).
This has the effect of eliminating print misalignment due to eccentricity, dents, etc.

[Effect of the Invention] As described above, the present invention provides a printing start position sensor that detects the presence or absence of a clamper provided on a timing belt that is installed at the tip of a platen roller and is wound around a pulley coaxial with the platen roller. And a paper presence / absence sensor installed between the platen roller and the printing start position sensor for detecting the presence / absence of paper sandwiched between the clampers, and the printing start position sensor detecting the presence of the clamper. CP that starts printing from the position where paper presence sensor in clamper detects paper presence
U, and in a printer device that performs color printing by rotating the clamper according to the number of colors, further comprising a clamper open / close position sensor that is installed in front of the platen roller and detects the presence or absence of the clamper, CP
U prints the previous color, drives the platen roller until the clamper opening / closing position sensor detects the presence of the clamper, stores the drive amount of the platen roller from the start of printing to the present time, and stores the next color. When printing, the correction drive amount is calculated so that the position of the platen roller is the same as the position at the start of printing of the previous color, and the platen roller is fed by the correction drive amount, so that the platen roller This has the effect of eliminating color misregistration even if there is eccentricity or dents.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a flowchart showing the operation of one embodiment of the present invention,
FIG. 3 is a side view schematically showing a mechanical portion of the conventional printer, and FIG. 4 is a flowchart showing the operation of the conventional printer. In the figure, (1) ... platen roller, (6) ... paper, (7) ... ink sheet, (8) ... thermal head, (9) ... clamper, (30) ... mechanical part, ( 31) I / O interface, (32) CPU, (33) ROM, (34) RAM. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Claims] A print start position sensor for detecting presence / absence of a clamper provided on a timing belt wound around a pulley coaxial with the platen roller, the platen roller and the print start position. The paper presence sensor in the clamper, which is installed between the sensors and detects the presence of paper sandwiched by the clamper, and the print start position sensor detects the presence of the clamper, and then the paper presence sensor in the clamper detects the presence of paper. A printer that starts printing from a set position and performs color printing by rotating the clamper in accordance with the number of colors, a clamper opening / closing position that is installed in front of the platen roller and detects the presence or absence of the clamper. The CPU further prints a previous color, and then opens the clamper. The platen roller is driven until the position sensor detects the presence of the clamper, the drive amount of the platen roller from the start of printing to the present is stored, and when printing the next color, the position of the platen roller is changed to the previous color. Wherein the correction drive amount is calculated so as to be the same as the position at the start of printing, and the platen roller is fed by the correction drive amount.