JPS5816873A - Regulation of stopping position of printing medium - Google Patents

Abstract

PURPOSE:To stop a printing medium at a desired stopping position by a method in which error values preset in a switching means and a given feeding amount stored in a feeding amount register are calculated and a given pulse number is supplied to a drive circuit. CONSTITUTION:In an arithmetic unit 12, pulse number is once stored in a pulse number generator 11, by which the stored pulse number is deducted while pulse from a phase shifter 10 is distributed and then supplied to a pulse motor drive circuit 9. In this way, the feeding of the printing medium is finished and whether or not the printing medium 1 is sent out and stopped at a right stopping place is confirmed by an operator. In case where excessive feeding is made, a deduction constant is set by a compensatory switch 13, whereas in case the feeding is short, an addition constant is set so as to make it coincide with a proper value.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for adjusting the stop position of a print medium used in a printer, which makes it possible to accurately adjust the stop position of a print medium to a desired position.

゛It passes between the first sensors 2, is pressed against the driven roller 3 and the drive roller 4, and is rotated in the direction of the arrow by these rollers, then passes between the second sensors 5, and is pressed against the driven roller 3 and the drive roller 4. 6 and a print head 70 disposed opposite thereto, and is fed and driven to a desired stop position P. Feeding printing media like this! ! In structure A, in order to accurately stop the normal print medium at the desired stop position P, the position of the second sensor 5 must be determined with extremely high precision, and the distance from the second sensor 5 to the stop position P must be determined with extremely high precision. For this reason, when screwing the second sensor 5 to the mounting part, it was necessary to make delicate adjustments.
In addition to the burden of readjustment in the event of a positional shift, it is extremely difficult to deal flexibly with various other variable factors.

As shown in FIG. 2, the feeding drive source for the print medium 1 is explained using the pulse motor 8 as an example.
The stop f1 position of the printing medium 1 is controlled by applying a required pulse force to the pulse motor 8 using the passing signal from the sensor 5 as a trigger.

However, originally, the above can be done when the second sensor 5 is fixedly held at an accurate position, and if the fixedly held position +1 is 6p, t and 1\' = ゛ is determined. Since the print medium 1 is stopped at a position other than the predetermined position irt, the print position on the print medium 1 is )1・coming 0On the print medium 1, as print data, anything other than characters and symbols can be read. In most cases, unique image data and index e data are written into the book V,''!, and the index marks printed by this printer are difficult to read accurately by other printers. This naturally leads to the standardization of the data printing position from the reference position,
Without uniformity, data reliability cannot be guaranteed. For this purpose, the feed of the print medium 1 after passing the second sensor 5 must be regulated with considerable precision. In order to meet the above requirements, it is desirable to adjust the fixed position of the second sensor 5 with high precision. However, since the burden of adjustment is large, in order to improve this, a method for adjusting the stop position of a printing medium according to the present invention, shown in FIG. 3, was created.

Referring to FIG. 3, the configuration and operation of the present invention will be explained. That is, a pulse motor drive signal is given to the feed amount register 14 from the printer control circuit (not shown),
The data in the feed amount register 14 is given as one input to the arithmetic unit 12.

Further, the data preset to the compensation switch 13 is applied to the other input. Compensation switch 13 is usually 16
Dual in-line IC with pin-type terminals
This switch is about the same size as , and the number of contacts that can be opened and closed is eight accommodated in this one switch means. In other words, by closing or opening these 8 switches, sleeve 1
'4 Create data for correcting the feed amount from the switch 13, and set it for the number of pulses specified by the pulse motor drive signal.
Arithmetic processing of addition or subtraction is performed. For example, the pulse motor drive signal generates a number of pulses corresponding to the amount of feed to the stop position in response to a rising or falling pulse immediately after the print medium passes the second sensor.
The number of pulses is stored in the compensation generator 11 as 1 (1) for the number of pulses of 0 supplied to the drive circuit 9 In this way, feeding of the print medium is completed for the time being, but the operator confirms whether the print medium 1 has been fed to the correct stop position and stopped.As a result, If there is overfeeding, set a subtraction constant using the compensation switch 13, and conversely, if underfeeding, set an addition constant to match the proper value. If a deviation from the position is found, the above operation is repeated.This allows the print medium 1 sent out in response to the pulse motor drive signal to move roughly from the second sensor 5 to the stop position. When the feed is completed, and the correction data of the compensation switch 13 provided separately is set for the fine adjustment of the second sensor, the feed is controlled to the original required stop position.

As explained above, according to the present invention, a compensation switch provided in the stop drive device and arranged in the control circuit of the printer can be used to adjust the amount of feed that needs to be finely adjusted. By applying this force, the printing medium can be stopped at the originally required stopping position.

Therefore, it is no exaggeration to say that there is no need to make subtle adjustments to the mounting position of the second sensor, and even if the distance between the normal stop position and the sensor changes due to aging, etc., the compensation switch can be operated. This has the effect of allowing position adjustment to be made extremely easily using only a chisel.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating a printing medium feeding system mechanism. FIG. 2 is a block diagram showing a conventional method for adjusting a print medium stop position 1a, and FIG. 3 is a block diagram showing a method for adjusting a print medium stop position according to the present invention. 1...Print medium 13...Compensation switch 2...
・First sensor -4・0 Feed amount register 3...Followed roller 4・■Drive roller 5...Second sensor 6・■Platen 7・Print head 8・・・Pulse motor 90・Pulse motor drive circuit 10...Fist phase shifter 11...Pulse number generator 12...Arithmetic unit 17 Fig. ? figure

Claims (1)

[Claims] In a print medium feeding drive that stops feeding a predetermined amount in response to a signal from a detector that detects the passage of the print medium,
The detector is fixed at a predetermined upstream position from the desired stop position, and a predetermined amount of print medium is fed from the upstream side to the downstream side, and the stopped position has a minute error value than the desired stop position. If so, a switch means for presetting the minute error value, a feed amount register storing a predetermined amount of printing medium to be fed, and an error value preset in the switch means and stored in the feed amount register. It consists of an arithmetic unit that calculates the predetermined amount of feed, and a pulse number generator that supplies the required number of pulses to the pulse motor drive circuit based on the value from the calculator, and it depends on the positioning accuracy of the detector. A method for adjusting a stop position of a print medium, characterized in that the print medium is stopped at a desired stop position without any trouble.