JPS6336956B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing device, such as a typewriter, word processor, etc., having an automatic paper feeder for automatically feeding paper.

When paper is automatically fed to a printing device, since the set position of the fed paper relative to the printing portion is constant, the printing start position of the paper is always constant.

The printing start position often differs depending on the person using the printing device and the arrangement of the printed portions of the paper used. Generally, in an automatic paper feeder, the printing start position when paper is set when paper is fed is fixed. Printing always starts at a certain distance from the leading edge of the paper. If the printing start position differs depending on each user or depending on the paper used at the time, printing is started after a predetermined line is fed without printing. Such conventional devices require wasted time before starting printing, which is an obstacle to increasing the speed of the printing device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a printing device that has a simple configuration and can freely adjust the initial setting position when feeding paper.

The details of the present invention will be explained with reference to the drawings.

In FIG. 1, the paper feed control device is provided with an initial position setting member 1, such as a dial 1, as a variable setting means, so that the printing start position can be set by setting a predetermined interval as one pitch, for example. That is, when starting printing from a position corresponding to the fifth pitch from the leading edge of the paper, the scale 5 of the initial position set dial 1 is set. If the interval of 1 pitch is set to 1 mm, it is also possible to set the initial position according to the distance mm from the leading edge of the paper.

The signal from the initial position set dial 1 is encoded by an encoder 2. For example, it can be changed to a 4-bit code signal. A code signal indicating the initial position set by the encoder 2 is input to a parallel adder 3, and is added to a signal from a fixed feed amount register 4 as a holding means indicating the minimum feed amount required for paper feeding. The minimum feed amount required for paper feeding is, for example, from the position where the paper is waiting to feed the paper 12 around the platen 11 of the printing device in FIG. The pitch number can be set as an amount obtained by converting the paper feed distance L to a position necessary for the leading edge of the paper to be pressed against the platen 11 by the pitman 14 serving as the paper pressing means. In this case, since the leading edge position of the paper and the printing position by the printing device do not match, the distance l from the printing position by the printing device to the leading edge of the paper is taken into consideration in advance and the scale of the initial position set dial 1 is taken into consideration. In other words, if the distance l from the leading edge of the paper to the first printing position needs to be at least 10 mm due to the structure of the printing device, the scale of the initial position set dial should start from 10, or The user of the printing device should be warned in advance that there is a distance of 10 mm at scale 0 of the position set dial, and the minimum distance required for the device is the reference initial position, and the difference from that reference initial position is the initial position. Various methods can be considered, such as displaying with scales 1, 2, etc. of a set dial.

The feed amount indicated as the sum of the minimum feed amount stored in the fixed feed amount register 4 by the paper feeding start command in the control device and the feed amount by the encoder 2 indicating the initial position set by the user, that is, the initial feed amount requested by the user. The value indicating the amount of feed required to feed the paper to the position is counter 5.
is set to

At the same time as the paper feed start command, the output of the paper feed motor drive signal is started, and a continuous pulse signal is generated as shown in FIG. A pulse signal which is a paper feed motor drive signal is amplified by an amplifier 6 and applied to a paper feed motor 7 to drive the motor. Naturally, the motor feed amount by one pulse is set to correspond to a predetermined paper feed amount.

The paper feed motor drive signal is input to the amplifier 6 and at the same time becomes a down pulse input to the counter 5, and the feed amount set in the counter 5 is decreased every pulse.

When the feed amount value is set in the counter 5, the output of the OR gate 8 changes from "L" to "H", but when the set value of the counter 5 is reduced by the pulse signal and becomes zero, the output of the OR gate 8 changes. The signal changes from "H" to "L", triggers the one-shot circuit 9, and issues a paper feed stop command as shown in FIG.

Paper feeding operation is stopped by the paper feed stop command.

According to the present invention, the position where the paper is initially stopped during paper feeding can be freely changed with a simple configuration, and there is no need to move the paper again after setting the paper and before starting printing as in the past. Since printing can begin immediately after setting the paper, work has become much more efficient. Moreover, since the initial position can be set one time at a time, even when printing on various types of paper, it is no longer necessary to set the paper and then adjust and move the paper to the printing start position.

Furthermore, in the present invention, the minimum necessary feed amount is maintained in order to feed the paper to the position necessary for the leading edge of the paper to be pressed against the platen by the paper presser, so that the paper reaches the printable position. There is no need to provide a detection means to detect whether the paper is being printed, and it is possible to make the paper margins extremely close to the minimum required margins due to the configuration of the printing device, making the printable area of the paper ideal. The effect is that it can be made wider.

Of course, no matter how the user operates the variable setting means, the paper is always fed to the position where the leading edge of the paper is pressed against the platen by the paper presser, so paper jams can be effectively prevented. .

Of course, it is not necessary to use paper with specific marks for controlling the position of the paper.

[Brief explanation of the drawing]

FIG. 1 is an explanatory block diagram of the control device according to the present invention, FIG. 2 is a time chart showing an example of the operation of the control device according to the present invention, and FIG. 3 is a paper sheet of a printing device using the control device according to the present invention. FIG. 1... Initial position setting member, 3... Adder, 4
... Fixed feed amount register, 5 ... Counter, 7 ... Paper feed motor.

Claims (1)

[Claims] 1 a platen, a paper feed motor for feeding paper from the rear of the platen through the bottom of the platen to the front of the platen, and a paper presser for pressing the paper against the platen at a position above the printing position. , a holding means for holding the minimum amount of paper feed required to feed the paper from a waiting position for paper feeding to a position required for the paper to be pressed against the platen by the paper pressing means; variable setting means that can be operated by a user to variably set the distance from the leading edge to the printing start position where printing starts in units of predetermined intervals; and a signal from the holding means and a signal from the variable setting means. control means for controlling the amount of rotation of the paper feed motor according to a signal, and the distance from the leading edge of the paper to the printing start position can be variably set by an operator operating the variable setting means. A printing device characterized in that, in response to a paper feed start signal, the paper is always fed by an amount greater than the feed amount held by the holding means.