JPS6226211Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device for a printing device, such as a line printer, which feeds continuous printing paper having creases such as perforations based on format control information.

As shown in FIG. 1, for example, a tape ink ribbon 1 that is made up of a printing hammer 3, a type band 4, etc. and is run in a horizontal direction along a printing position, and a continuous printing paper 2 that has creases such as perforations are used. In the printing device, the ink ribbon 1 is lifted by the fold line of the paper 2, and the next line is printed in this lifted state, resulting in omitted or missing characters. It has been found that such lifting of the ink ribbon 1 occurs more frequently as the paper 1 becomes thicker and as there are multiple line breaks such as page breaks and line feeds. In addition,
Reference numeral 5 denotes a sprocket that feeds the paper 2 by engaging with feed holes provided along both side edges of the paper 2.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, to prevent the ribbon from lifting up, and to prevent omitted characters due to the lifting.

The present invention focuses on the fact that the ink ribbon is lifted by the crease when a multiple line feed occurs, and when the crease passes the printing position, the paper is fed by repeating intermittent single line feeds. The feed speed is lowered to prevent the ink ribbon from being lifted. The present invention will be described below with reference to FIGS. 2 and 3 showing embodiments.

The paper feed control unit 6 receives the paper feed start pulse signal FEED.
It has a function of generating a paper feed end pulse signal FEED RESET when it generates a SET and receives a predetermined number of pulse signals LINE PULSE, which are generated every time a new line is added. It also has a function of generating CHI and CHI2, which are format control information from the format control tape or format control buffer, and indicate the first line and bottom line of each page of the paper 2, respectively. When the motor control unit 7 receives the level signal FEED of the paper feed execution command and rotates the paper feed motor 8 by one line, a line feed pulse signal LINE is sent to the paper feed control unit 6.
It has the function of generating one RULSE. The print control unit 9 generates a level signal that delays the start of printing.
When receiving PRINT DELAY, it has a function to wait without starting printing during that time. pulse signal
RESET is used for initial reset when power is turned on. The flip-flop 10 receives the pulse signal
Since they are set and reset by FEED SET and FEED RESET, respectively, the first output terminal becomes a logical value 1 when paper is fed. flipflop 11
is the format control information CHI2 and
Since they are set and reset by CHI,
While the line from the bottom edge of the paper 2 to the first line of the next page passes through the print position, its first output end becomes a logical value 1. The flip-flop 13 is set by the trigger input of the one shot 14 which provides an intermittent time for each line, and is reset by the next pulse signal FEED SET, so it remembers that there is a case where a line feed is required with one intermittent line. The one shot 14 is triggered by the output of the AND gate 17, and acts via the AND gate 16 to wait for the next line feed for a certain period of time. One shot 15 is triggered by the output of AND gate 18 and outputs level signal PRINT.
DELAY is sent to the print control unit 9 to delay the start of the next print for a certain period of time. AND gate 17 is a pulse signal LINE PULSE and switches 19, 20, 21
When a match is found, the one shot 14 is triggered and the flip-flop 13 is set. Flip-flop 1 remembers that AND gate 18 is a case where intermittent single line breaks are required.
3 and the pulse signal FEED RESET, one shot 15 is triggered, and a level signal PRINT DELAY is generated. That is, when performing intermittent one-line feeds, the start of printing is delayed for a predetermined period of time after the end of paper feeding.

The changeover switch 19 is a switch for switching whether to feed the paper by repeating intermittent one-line feeds when the fold line of the paper 2 passes the printing position, or to perform full sheet feeding by repeating intermittent one-line feeds. The manual switch 20 is a switch whose contact point is closed to prohibit the intermittent one-line feed and to perform normal paper feeding. The paper thickness detection switch 21
When the thickness of the
This is a switch that enables paper feed by repeating line breaks.

FIG. 3 is a time chart for explaining the operation of the block circuit diagram in FIG. 2, and is a time chart from the bottom row of a certain page, that is, one line before the signal CHI2 is generated, to the first row of the next page, that is, the signal CHI is generated. This shows a case where 7 line feeds are executed by repeating intermittent 1 line feeds. In addition, the changeover switch 19 is a flip-flop 1.
It is assumed that the manual switch 20 and the paper thickness detection switch 21 are both open.

As described above, according to the present invention, since the ink ribbon is not lifted up by the fold line, omitted characters and missing characters can be prevented from being printed.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an example of a printing section to which the device of the present invention is applied, Fig. 2 is a block circuit diagram showing an embodiment of the device of the present invention, and Fig. 3 is a time chart for explaining the operation of Fig. 2. It is. In the figure, 1 is an ink ribbon, 2 is a printing paper,
3 is a printing hammer, 4 is a printing band, 5 is a sprocket, 6 is a paper feed control section, 7 is a motor control section, 8
is a paper feed motor, 9 is a print control unit, 10, 11,
13 is a flip-flop, 14, 15 are one-shots, 16, 17, 18 are AND gates, 19 is a changeover switch, 20 is a manual switch, 21
is the paper thickness detection switch.

Claims (1)

[Claim for Utility Model Registration] An ink ribbon running horizontally along the printing position and continuous printing paper having creases such as perforations are fed in a direction perpendicular to the running direction of the ink ribbon, and every time a predetermined line is fed. A paper feed means for generating a line feed signal, format control information indicating at least the first line and the bottom line of each page of paper, a paper feed start signal, and a predetermined number of count of the line feed signals after generating the paper feed start signal. a paper feed control unit that generates a paper feed end signal when the paper feed ends; a paper feed control unit that receives the paper feed start signal and generates a paper feed signal that drives the paper feed means; and receives the paper feed end signal and generates the paper feed signal; and a first control means for stopping the first line, in response to the format control information indicating the bottom line, generating a fold passing signal indicating that the fold of the paper passes through the printing position, and stopping the first line. a second control means for stopping the generation of the fold passing signal in response to format control information shown; and a second control means receiving the fold passing signal of the second control means and the line feed signal until a predetermined time elapses from generation of the line feed signal. A paper feeding device for a printing apparatus, comprising: a time limit means for prohibiting a paper feeding signal from the first control means from being sent to the paper feeding device.