JPH07102725B2 - Line feed amount control method by paper thickness - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A method for controlling a line feed amount based on a sheet thickness, which aims to enable printing on a regular position on any medium, and is used for a printer device having an automatic sheet thickness adjusting function. This is a line feed amount control method based on the thickness.Paper of a specified thickness is fed between the print head and the platen for automatic paper thickness adjustment.The cam rotation amount As at this time is stored in memory and When printing on, the paper is fed between the print head and the platen for automatic paper thickness adjustment, the cam rotation amount Ac at this time is calculated, and the cam rotation amount As and the cam rotation amount Ac are compared. ,
It judges whether the printing paper is thick paper, thin paper, or not. If it is neither thick nor thin paper, the line feed motor is instructed the rotation amount of N at the time of line feed. The rotation amount is N + α (α is a positive real number), and in the case of thin paper, the line feed motor is substantially instructed to rotate by N−β (β is a positive real number). .

[Industrial application field]

The present invention relates to a method for controlling a line feed amount based on a sheet thickness, which changes a rotation amount command value for a line feed motor in accordance with a sheet thickness.

[Conventional technology]

Line feed is performed by driving a pulse motor for line feed. When the line feed amount is, for example, 1/6 inch, the rotation amount command value for the line feed pulse motor is set to 60 pulses. Conventionally, when performing 1/6 line feed, the rotation amount command value is set to 60 pulses regardless of whether the paper is thick paper or thin paper.

[Problems to be Solved by the Invention]

However, in the case of standard thickness paper, if the line feed pulse motor rotates 60 pulses, 1/6 inch line feed is performed, but in the case of thick paper, even if the line feed pulse motor rotates 60 pulses, 6-inch line feed is not performed, and in the case of thin paper, line feed of 1/6 inch or more is performed when the line feed pulse motor rotates 60 pulses. The reason for this phenomenon is
In the case of thick paper, the slip amount between the paper feed roller and the paper is larger than that in the case of the standard thickness paper, and in the case of thin paper, the slip amount between the paper feed roller and the paper is smaller than that in the case of the standard thickness paper. Is.

As described above, conventionally, a line feed is performed uniformly on paper of any thickness, so the line feed amount is small for thick paper and large for thin paper. Therefore, when printing is performed on the paper on which the framework, the item name, and the like are preprinted, the lower part of the paper does not match the preprint.

The present invention was created in view of this point, and it is possible to print on any medium at a regular position with a kotatsu that corrects the line feed amount due to the difference in paper thickness. It is intended to provide a line feed amount control method by.

[Methods for solving problems]

FIG. 1 is an explanatory view of the principle of the present invention. The printer device that is the subject of the present invention has an automatic paper thickness adjusting function that adjusts the distance between the print head and the platen by a cam to keep the distance between the paper on the platen and the print head constant.

The paper with the specified thickness is fed between the print head and the platen in advance to automatically adjust the paper thickness.
Store As in memory.

When printing on paper, the paper is fed between the print head and the platen for automatic paper thickness adjustment, the cam rotation amount Ac at this time is calculated, and the cam rotation amount As and the cam rotation amount Ac are compared. Then, it is determined whether the printing paper is thick paper, thin paper, or not. If it is neither thick nor thin paper, set the line feed amount to N and rotate the line feed motor based on this setting value. If it is thick paper, set the line feed amount to N + α (α is a positive real number), The line feed motor is rotated based on this set value, and in the case of thin paper, the line feed amount is set to N-β (β is a positive real number),
The line feed motor is rotated based on this set value.

〔Example〕

FIG. 2 is a perspective view of an example of a printer device capable of adjusting the head gap, and FIG. 3 is a sectional view showing details of a guide portion above the carrier. The guide rod 2 is mounted parallel to the platen 1, and the L-shaped guide rail 3
Are mounted parallel to the guide rod 2. The carrier 4 travels back and forth along the guides 2 and 3. The platen 1 is the shaft of the paper feed roller 10 that is mounted on the frame of the device.
The arm 11 is swingably supported by the arm 12 and is attached to the print head so as to be close to and away from the print head. Rollers 13 are axially attached to both ends of the platen 1, and in the platen 1 urged downward by its own weight or a spring, the rollers 13 have a cam 6
Is supported by abutting against. The cam 6 is fixed to the cam shaft 14, and the cam shaft 14 is mounted on a fixed position of a frame (not shown), and the pulse motor 1 is provided via gears 15 and 16.
Connected to 7. Therefore, when the cam 6 is rotated by the pulse motor 17, the platen 1 is pushed by the cam 6 and moves up and down. The contour curve of the cam 6 is a curve in which the rotation angle of the lift amount cam 6 of the platen 1 is proportional. Carrier 4 is
It is slidably and rotatably supported by a guide rod 2 attached to a fixed position of the frame, and a guide rail 3 is sandwiched by a roller 20 and a sliding body 21 above the guide rod 2. The guide structure on the upper part of the carrier is shown in FIG. 3, in which the guide rail 3 is held by the roller 20 pivotally mounted on the carrier 4 and the sliding body 21 biased toward the roller 20 by the spring 22. The movement of the carrier 4 along the guide rod 2 is allowed, and the rotation of the carrier 4 around the guide rod 2 is restricted. In FIG. 3, 23 is a sleep that holds the sliding body 21 so that it can be retracted and retracted, and 24 is a spring retainer.

The print head 5 is an arm 4a that extends horizontally below the carrier 4.
The print head 5 moves toward and away from the platen 1 when the carrier 4 rotates around the guide rod 2. And the guide
The rotation of the carrier 4 around the rod 2 causes the roller 20 and the spring 22 to rotate.
It is regulated by the sliding body 21 urged by. That is, the print head 5 is biased toward the platen 1 by the spring 22, and the advance end position of the print head 5 is regulated by the roller 20.

The detection piece 30 is fixed to the upper part of the carrier 4, and the sensor 7 having a pair of light emitters 31 and light receivers 32 facing each other at a position slightly apart from the position of the tip of the detection piece 30 in the steady state. Are arranged. A printer having an automatic head gap adjusting function is disclosed in, for example, Japanese Patent Laid-Open No. 61-
It is disclosed in detail in 199969 and JP-A-63-137870.

FIG. 4 is a diagram showing an example of the paper transport system of the printer. When the line feed pulse motor rotates, the platen 1, the paper feed roller 69, the paper feed rollers 70 to 71, and the discharge roller 73 rotate. The tractor 74 is used when the continuous form paper is used.

The automatic feeding of the cut sheet 40 is performed as follows.

 The hopper (not shown) rises.

The paper feed roller 69 rotates, and the paper 40 is taken out from the hopper.

The front end of the paper 40 is fed to a predetermined position by the rotation of the paper feed rollers 70 and 71, and then the paper 40 is fed by a predetermined distance (until the first line of the paper comes under the print head 5).

The paper is discharged as follows.

The sheet 40 is conveyed by the rotation of the platen 1, the sheet feed roller 72, and the discharge roller 73.

After the trailing edge of the paper 40 has passed a predetermined position, the paper is further fed by a predetermined distance and discharged to a stacker (not shown).

FIG. 5 is a diagram showing an example of an electric circuit of the printer. The microprocessor 50 executes the programs stored in the control memory 52. The RAM 51 has a buffer that temporarily holds data, a work area, and the like. The E ² PROM 53 stores data to be saved. The interface control circuit 54 controls data transfer with the main computer. The microprocessor 51 sends data to the console panel 55 and the driver & function unit 56 via the output port 57, and reads data from the console panel 55 and the driver & function unit 56 via the input / output port 58. You can Bidirectional driver / receiver
Reference numeral 60 is for driving an address signal, and bidirectional drivers / receivers 61, 62 are for driving data signals. The address decoder 59 decodes the address signal. Data is written / read to / from a register or the like defined by the decoding result. The driver & mechanism unit 56 includes a pulse motor for automatic head gap adjustment, a carrier moving motor, a line feed pulse motor, and the like.

FIG. 6 is a diagram for explaining the line feed processing of the present invention. When the printer is shipped from the factory, start the adjustment test program TP, feed the reference medium (paper of reference thickness),
Performs auto head gap processing. The auto head gap process means a process in which the distance between the front end of the print head and the paper surface is set to a constant value with the paper inserted. After performing the auto head gap processing, the operation amount As of the cam 6 at that time (each rotation based on the lowermost position of the platen) is stored in the E ² PROM 53. The printer device is shipped in this state.

The user printer device performs the following line feed processing. Upon receiving the print command, the printer device feeds paper. After the paper is fed to the predetermined position, the auto head gap operation is performed, and then the cam operation amount Ac is counted. This value is stored in RAM51. When printing the first line of the paper, the cam operation amount As stored in the E ² PROM 53 is compared with the current cam operation amount Ac. Cam movement amount
If Ac is 20 pulses or more larger than the cam movement amount As, the current paper is determined to be thin paper, and the cam movement amount Ac is the cam movement amount.
If 20 pulses or more is smaller than As, the current paper is determined to be thick paper.

For thick paper + 1/4 inch (60 pulse) line feed + 0.04mm
Correction is required, and in the case of thin paper, a 1/6 inch (60 pulse) line feed requires -0.04 mm supplementation. The line feed resolution is 0.07 mm (1/360 inch) per pulse, so one pulse is corrected for every 105 pulses. For example, in the case of thin paper, the first rotation amount command value for the line feed pulse motor is 60 pulses, the second rotation amount command value is 59 pulses, and the third rotation amount command value is 60 pulses. The fourth rotation amount command value may be 59 pulses, the fifth rotation amount command value may be 60 pulses, the sixth rotation amount command value may be 59 pulses, and the seventh rotation amount command value may be 59 pulses. . In the case of thick paper, the first rotation amount command value for the line feed pulse motor is 60 pulses, the second rotation amount command value is 61 pulses, and the third rotation amount command amount is 60 pulses. If the fourth rotation amount command value is 61 pulses, the fifth rotation amount command value is 60 pulses, the sixth rotation amount command value is 61 pulses, and the seventh rotation amount command value is 61 pulses good. If it is neither thin paper nor thick paper, the rotation amount command value for the line feed pulse motor is always 60 pulses.

The first line is printed after the first line of the paper is positioned at the print head position, and then a line feed is performed, but the second line feed is performed as described above. That is, the rotation amount command value is 59 pulses for thin paper, the rotation amount command value is 61 pulses for thick paper, and the rotation amount command value is 60 pulses for neither thin nor thick paper. .

〔The invention's effect〕

As is clear from the above description, according to the present invention, printing can be performed at the regular line position regardless of the thickness of the paper. In the above description, the printer device in which the platen moves up and down by the cam is taken as an example, but it goes without saying that the present invention can be applied to a printer device in which the print head moves up and down by the cam.

[Brief description of drawings]

FIG. 1 is a diagram explaining the principle of the present invention, FIG. 2 is a diagram showing an example of a printer device capable of adjusting a head gap, FIG. 3 is a diagram showing details of a guide portion above a carrier, and FIG. FIG. 5 is a diagram showing an example of a sheet conveying system, FIG. 5 is a diagram showing an example of an electric circuit of a printer, and FIG. 6 is a diagram explaining a line feed process of the present invention. 1 ... Platen, 2 ... Guide rod, 3 ... L-shaped guide rail, 4 ... Carrier, 5 ... Print head, 6
…… Cam,… 7 …… Photo sensor, 40 …… Paper, 50 ……
Microprocessor, 51 ... RAM, 52 ... Control memory, 53
...... E ² PROM, 54 …… Interface control circuit, 52 …… Console panel, 56 …… Driver & mechanism part, 57 …… Output port, 58 …… Input port, 69 …… Paper feed roller, 70 None 72 …… Paper feed roller, 73 …… Ejection roller, 74 ……
Tractor.

Claims (1)

[Claims] 1. A line feed amount control method for a paper thickness in a printer device having an automatic paper thickness adjusting function for adjusting a distance between a print head and a platen by a cam so as to keep a distance between a paper on the platen and the print head constant. If a specified thickness of paper is fed between the print head and the platen for automatic paper thickness adjustment, the cam rotation amount As at this time is stored in memory and printing is performed on the paper. Is fed between the print head and the platen to perform automatic paper thickness adjustment, the cam rotation amount Ac at this time is calculated, and the cam rotation amount As and the cam rotation amount Ac are compared to determine whether the print paper is thick paper or thin paper. If it is neither thick nor thin, set the line feed amount to N,
The line feed motor is rotated based on this setting value. In the case of thick paper, the line feed amount is set to N + α (α is a positive real number), and the line feed motor is rotated based on this setting value. The line feed amount control method according to the paper thickness is characterized in that the line feed amount is set to N-β (β is a positive real number) and the line feed motor is rotated based on this set value.