JPS59192588A - Printer - Google Patents

Abstract

PURPOSE:To automatically supply a paper when the paper is absent and prevent blind printing on a platen from occurring, by providing a means for detecting the presence or absence of a paper at a printing position. CONSTITUTION:In the case where a printing code is fed while a paper-supplying code is not fed from a host computer to the printer, when the result of detection by a means 6 for detecting the presence or absence of the paper at the printing position indicates the absence of the paper at the printing position, the paper is automatically supplied by a paper-supplying action of an automatic paper-supplying part 3. Accordingly, in the case where setting of the paper-supplying code and setting of the printing code are separately performed by the operator of the apparatus, even when the operator operates to feed a series of printing codes from a host machine to the printer without setting the paper-supplying code, blind printing on the platen 7 does not occur, and it is possible to prevent the platen from being contaminated and to prevent the surfaces of a printing head and the platen from being damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a printing device used in various systems such as a personal computer, a document creation machine, and an electronic typewriter, and particularly to a printing device having an automatic paper feed section.

(Prior art) Printing devices (devices with printing or drawing functions) used in various systems such as personal computers, document processing machines, electronic typewriters, etc. that are equipped with an automatic paper feeder are exceptions. Except in special cases, the paper on which printing is to be performed is fed from an automatic paper feeder.

By the way, various operations in a printing device are performed based on control operations performed by a central processing unit (cpU) provided in the printing device in accordance with a code sent from a host machine. The codes to be sent from the host machine to a printing device with an automatic paper feed section are, in order, a paper feed code, a series of print codes and a space operation code (or line feed code), and a paper ejection code. Needed.

However, in systems where a printing device with an automatic paper feeder is used, the paper feed code and print code may be set separately by the device operator; In such a system, it is not uncommon for the operator of the device to perform an operation such as sending a series of print codes from the host machine to the printing device without setting the paper feed code.

If the above-mentioned erroneous operation is performed by the operator, the printing operation performed by the printing device based on a series of printing codes sent from the host 1 to the machine in the system to the printing device will cause the platen to Blank printing will be performed on the top, and as a result,
Undesirable things can happen, such as soiling the platen, soiling the back side of the next sheet, and damaging the printhead or platen surface.

(Objective)' The present invention provides a system in which a printing device having an automatic paper feeding section is used, in which settings for a paper feeding code and a printing code are performed separately by an operator of the device. In some cases, even if the equipment operator sends a series of print codes from the host 1 to the machine to the printing device without setting the paper source code, blank printing may occur on the platen. The purpose of this invention is to provide a printing device that eliminates this problem.

(Structure) Hereinafter, specific contents of the printing device of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing an outline of the configuration of a printing device of the present invention, FIG. 2 is a block diagram of an embodiment of the printing device of the present invention, and FIG. 3 is a flowchart 1. .

In FIG. 1, 1 is printer control code receiving means;
2 is an operation selection control means, 3 is an automatic paper feed section, 4 is a paper feed control means, 5 is a paper feed control means, 6 is a means for detecting the presence or absence of paper at a printing position, 7 is a platen, 8 is a print control means, 9 is a printing section, and in the printing device of the present invention,
If a printing code is sent to the printing device while the host computer is not sending a paper feed code, the presence or absence of paper at the printing position is detected by the detection means 6, and the paper is placed at the printing position. When there is no paper, paper is automatically fed by the paper feeding operation of the automatic paper feeding section 3, so that blank printing is not performed on the platen 7.

In FIG. 2, the DB represents various types of data (not shown) sent from a host computer to the printing device.
BA is a buffer memory, CP is a transmission path for
U is the central processing unit (hereinafter sometimes simply abbreviated as CPU), ROM, RAM is the storage device, Il
o is an input/output port, which uses various data sent from the host computer via the transmission line DB,
The CPU (1) code table (or character
The printing operation or drawing operation (hereinafter simply referred to as printing operation) is controlled by converting data using the generator. (2) Four movements of the carriage in the printing section 9 (
(space movement).

(3) Control the paper line feeding operation. (4) The platen 7 is driven by the paper feed section 3 and the platen 7.
Controls the paper loading operation. Perform corner control operations.

In FIG. 2, the automatic paper feed section 3 includes a paper feed motor 11, a drive circuit 10 for the paper feed motor, a paper feed roller 13, and power transmission means 12, 1.4 (for example, a chain 12 and a subrocket 1-4).
14), bottom plate of paper feed section] 5, paper corner holder 16,
A receiver for printed paper is comprised of a plate 17, a guide plate 18 for paper P, and the like, and paper P is sent out from paper feed section 3 when paper feed roller 13 is driven.

The paper P sent out from the paper feed section 3 as described above is wound up to a predetermined position around the platen 7 by driving rotation of the platen 7 . 20 is a drive motor for the platen; 19 is a drive circuit for the above-mentioned platen drive motor; 21. ．． 22 is a pressure roller, 23
is paper pale.

In FIG. 2, 25 is an amplifier for the signal detected by the means 6 for detecting the presence or absence of paper at the printing position, and 25 is a printing unit driving circuit.

Next, the operation of the stamp device shown in FIG. 2 will be explained with reference to the flowchart shown in FIG. When the power is turned on and the printing device is put into operation, initialization is performed in step (0), and when a code is input from the host computer in step (1), the code input in step (2) is Check whether the input is a print code, and if it is not a print code, proceed to step (3) and perform each operation from step (3) to step (10), but step (3)
The operations from step (1o) to step (1o) are normal operations in a printing device, and are not unique to the printing device of the present invention, so a detailed explanation thereof will be omitted.

If '/ES in step (2), step (11
). In step (11), the detection result of the detection means 6 of the presence or absence of paper at the printing position is checked, and if there is paper P at the printing position, the process proceeds to step (15) and printing operation processing is performed. If there is no paper at the printing position, the process proceeds to step (12) to perform paper feeding operation processing, and the process proceeds to step ( ) 3 to check the detection result of the detection means 6 as to the presence or absence of paper at the printing position.

If the determination result in step (13) is NO,
The paper jam processing in step (14) is performed to stop the operation of the printing device. Further, if the determination result in step (13) is vR3, the process advances to step (5) and printing operation processing is performed.

In the operation of the printing apparatus of the present invention described with reference to FIG.
(This is the case when the paper is placed at the printing position according to Even if the paper is provided at the printing position, the detection means 6 advances the paper a predetermined distance only in the case of the first printing code to detect the presence or absence of paper at the printing position.
If a compensating means is added to check the detection results from , substantially the same operation as described with reference to FIG. 3 will be performed.

The compensation means described above includes step (11) in FIG.
and step (12).

Further, even if the detection means 6 for detecting the presence or absence of paper at the printing position is provided at a position that lags behind the printing position by the print head in the paper advancing direction, only in the case of the first printing code, the predetermined If a compensating means is added, such as advancing the paper by the distance specified and checking the detection result from the detecting means 6 as to the presence or absence of paper at the printing position, as described with reference to FIG. Substantially similar operations are performed.

7- In addition, paper feed during paper line feeding and paper ejection operations, etc.
This is performed by the paper feed control means 5 shown in FIGS. 1 and 2.

(Effects) As is clear from the detailed description below, in the printing device of the present invention, when the paper feed code is not sent from the computer to the host 1 for the printing device, the printing code is When a paper is sent, if there is no paper at the printing position based on the detection result by the detection means 6 of the presence or absence of paper at the printing position, paper is automatically fed by the paper feeding operation of the automatic paper feeding section 3. Platen 7
Therefore, in the printing device of the present invention, in a system in which a printing device having an automatic paper feeding section is used, the settings of the paper feeding code and the printing code can be set as follows. If the machine operator is configured to do this separately, the machine operator may send a series of print codes from the host machine to the printer without setting the paper source code. However, before a printing operation is performed on the printing device based on a series of printing codes sent from the host machine in the system to the printing device, the printing device detects the presence or absence of paper at the printing position by the detection means 6. Therefore, when there is no paper at the printing position, the paper is automatically fed by the paper feeding operation of the automatic paper feeder 3, so blank printing will not be performed on the platen, and the platen will not become dirty. Problems such as staining the back side of the next sheet of paper or damage to the print head or platen surface do not occur.According to the printing device of the present invention, the above-mentioned conventional problems can be avoided. The problem can be resolved satisfactorily.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an outline of the configuration of a printing device of the present invention, FIG. 2 is a block diagram of an embodiment of the printing device of the present invention, and FIG. 3 is a flowchart. ■-Receiving means for printer control code, 2-Operation selection control means, 3--Automatic paper feed section, 4--Paper feed control means, 5
...Paper feed control means, 6.Means for detecting the presence or absence of paper at the printing position, 7..Platen, 8..Printing control means, 9..Printing section, DB..Transmission path for various data (codes), BA ...Buffer memory, CPU...Central processing unit, ROM, RAM...Storage device, Ilo
...Iride Kapo-1~, Rico Co., Ltd. - Representative Patent Attorney Takao Imma 11-

Claims (1)

[Claims] A printer control code receiving means, an operation selection control means, an automatic paper feeding section, a paper feeding control means, a paper feed control means, a means for detecting the presence or absence of paper at a printing position, a platen, a printing control means, A printing device comprising a printing section