JPS6325953B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printer that allows printing sheets to be loaded smoothly when loading tickets into a printing device.

Conventionally, in printers that can print on single sheets,
When loading a cut sheet, the carrier is in the home position, so the left end of the leading edge of the cut sheet is under free pressure near the platen by the paper holder attached to the front of the carrier, but there is nothing on the right end. Since there is nothing to hold down the paper, the right edge moves away from the platen and sag towards you, and if you hold it in that position and tilt the lever of the roller toward the platen, the paper will sag. SUMMARY OF THE INVENTION The present invention solves this drawback and provides a printer in which the inserted printed paper can be set smoothly without sagging toward the front.

This will be explained below with reference to the drawings. FIG. 1 is a perspective view showing one embodiment of the present invention. In the figure, reference numeral 1 denotes a printing head, and although a dot printing head is shown as an example, the invention is not limited to this. Reference numeral 2 denotes a carrier on which the printing head is mounted, which slides left and right along a guide shaft 3. 4 is a drive motor capable of forward and reverse rotation; 5 is a drive belt stretched between a drive pulley 6 fixed to the rotating shaft of the motor 4 and an idle pulley 7; 8 is a platen; 9 is printing paper; 10
11 is a presser roller for pressing the printing paper 9 against the platen; 11 is a presser lever that rotates around a shaft 12 to press and release the presser roller 10 against the platen 8; and 13 is a presser lever 11.
14 is a left paper guide provided to be able to slide on the face plate 15; 16 is a switch that detects that the printing paper 9 has been inserted; A sensor 17 sends a signal to the face plate 1 according to the width of the printing paper 9.
A right paper guide 18 slides left and right on the right paper guide 5, and a sensor 18 is arranged corresponding to each digit on the back side of the face plate 15, and sends out the output of the sensor corresponding to the digit blocked by the right paper guide 17. width detector,
Reference numeral 19 is provided on the front surface of the carrier 2, and is moved forward by a mechanism (not shown) during printing to the platen 8.
20 is a front guide that presses the printing paper 9 and, when not printing, retreats to the reference position to maintain a predetermined gap with the platen 8 and serves as a guide when inserting the printing paper 9; 20 is the width detection device; a position code generator that generates a position code based on information from the device 18;
1 is a differentiation circuit that receives the output of the sensor 16 and generates a differential signal at the falling edge of the output; 22 stores the position code from the position code generator 20, and the signal from the differentiation circuit 21 is used for the accumulation described above. A register for outputting information; 23 is an arithmetic unit that performs calculations based on the information from the register 22 to find the position half the width of the printing paper; 24 is a driver circuit for the drive motor 4; and 25a and 25b are home position sensors.

2 is a sectional view taken along the line A-a in FIG. 1, and FIG. 3 is a side view of FIG. 2 viewed from the left side.

In FIGS. 2 and 3, 26 is a shielding plate;
7 is a plurality of sensors arranged in parallel with a width corresponding to the pitch 4 of one character; 28 is a paper guide 14 and 1;
This is a push spring to prevent 7 from moving easily.

Next, the operation of the present invention configured as described above will be explained using the time chart shown in FIG.

First, the right paper guide 17 is moved in accordance with the width of the printing paper 9. (In this example, to simplify the explanation, it is assumed that the left paper guide 14 is fixed.) Then, the shielding plate 26 of the right paper guide 17
are interposed between the corresponding sensors 27, so a signal is output from the sensor 27 and sent to the position code generator 20.

The position code generator 20 generates a position code corresponding to the sensor 27 that sent the signal, and sends it to the register 22.

On the other hand, when the printing paper 9 is inserted between the left paper guide 14 and the right paper guide 17, the sensor 16 detects this, and detects that the printing paper 9 has been inserted as shown in FIG. The detection signal is sent to the differentiation circuit 21.

The differentiating circuit 21 differentiates the output of the sensor 16 at the falling edge, as shown in FIG. 4B, and sends the differential output to the register 22. The register 22 uses the signal from the differentiating circuit 21 as a timing signal to output the stored position information sent from the position code generator 20 to the arithmetic unit 23.

The calculator 23 calculates the position of half the width of the printing paper 9 from the given position information, and sends the amount of movement corresponding to the calculated position to the driver circuit 24 of the drive motor 4. Therefore, the motor 4 rotates forward by a predetermined amount as shown in FIG. 4C, and the carriage 2 moves to the position shown in FIG. In this state, the printing paper 9 goes around the platen 8 and is inserted between the platen 8 and the front guide 19, but since the carrier 2 is in the center of the width of the printing paper 9 as described above, the front guide 19 The distance from the left and right ends of the printing paper 9 to the left and right ends of the printing paper 9 is shortened, so that it does not move away from the platen 8 and sag towards you as in the conventional case. Even when the printing paper is tilted to the side, the printing paper can be inserted smoothly without being caught between the presser roller 10 and the platen 8 and folded. When the presser lever 11 is moved toward the platen 8, the switch 13 detects that the printing paper 9 has been set as shown in FIG. 4D and sends a detection signal to the calculator 23. The same amount of inversion information as the amount of normal rotation is sent to the driver circuit 24. Therefore, the driver circuit reverses the drive motor 4 as shown in FIG. 4C to return the carriage 2 to the home position.

With this, printing preparation can be easily completed.

As explained above in detail, according to the present invention, when setting the printing paper, the printing head moves to a position halfway up the printing paper, so when setting the printing paper, the edge of the printing paper There will be no more sagging.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
3 is a left side view of FIG. 2, and FIG. 4 is a time chart for explaining the operation. 1...print head, 2...carrier, 4...
...Motor, 8...Platen, 9...Print paper, 1
4, 17...Paper guide, 18...Width detector, 19...Front guide, 20...Position code generator, 21...Differential circuit, 22...Register, 2
3... Arithmetic unit, 24... Driver circuit.

Claims (1)

[Claims] 1. A printer capable of printing on single sheets, comprising: a paper guide that moves left and right according to the width of printing paper; a detector that detects the position of this paper guide; and a detector that detects the position of this paper guide based on the output of this detector. a calculator that calculates the position of half the width of the printed paper; a detector that detects that the printed paper is inserted between the paper guides; means for detecting insertion and moving the print head to the position calculated by the arithmetic unit; a detector for detecting completion of setting the print paper; 1. A printer comprising: means for detecting that setting is completed and returning the print head to its home position.