JPS61268470A - Printer - Google Patents

Abstract

PURPOSE:To make a platen unnecessary by a construction wherein a printing head disposed opposite to roll paper is made to approach the roll paper and separated therefrom when printing of one line on the outermost peripheral surface of paper is completed, and it is made to approach the paper again for printing after the paper is fed. CONSTITUTION:When a belt 28 is driven clockwise by a motor 17, a roller 23 winds up a belt 21, a gear 18 moves backward, rotating on a flat-board gear 19, and a printing head 12 set integrally with a guide shaft 13 is made to approach roll paper 6. When a contact-type sensor 16 senses the outer peripheral surface of the roll paper, the drive of the motor 17 is stopped, the printing head 12 is moved along the guide shaft 13, and thereby printing is conducted on the outer peripheral surface of the roll paper 6. When printing for one line is completed, the printing head 12 is separated from the paper by rotating the motor 17 reversely. After the paper is fed at a prescribed distance by driving a motor 11 for a prescribed time, the printing head 12 is made to approach the paper again for printing. This construction makes it possible to make a platen unnecessary and to make a printer small in size.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a printing device that uses roll paper as printing paper.

[Prior art and problems to be solved by the invention] Conventionally,
There are various types of printing devices that use roll paper as the printing paper, but the printing device usually consists of a roll paper, a platen to which the leading edge pulled out from the rolled paper is attached, and a platen to which the leading edge is attached. and a print head facing each other through the print head.

However, the roll paper usually has a large space, and the platen to which the leading edge of the roll paper is attached spans the width of the paper, and printing devices that use the roll paper as printing paper are usually large. .

OBJECT OF THE INVENTION] The present invention has been made to solve the problems of the prior art described above, and an object of the present invention is to provide a compact and inexpensive printing device.゛[Means for Solving the Problems] In order to achieve this object, the printing device of the present invention includes a roll paper rotatably supported on a machine frame, and a print head disposed opposite to the roll paper. and means for bringing the print head close to and away from the roll paper, and the print head prints on the outermost peripheral surface of the roll paper.

In the printing device having the above configuration, the print head disposed facing the roll paper comes close to the roll paper and after completing printing one line on the outermost surface of the roll paper, the print head moves away from the roll paper. do. Then, when the leading end of the roll paper is fed, the print head approaches the roll paper again and prints on the outermost surface of the roll paper. This eliminates the need for a platen, which is required in conventional printing devices.

[Example] Hereinafter, an example embodying the present invention will be described using FIGS. 1 and 2.

In FIG. 1, this printing device includes left and right machine frames 5a, 5.
A support shaft 7 for supporting the roll paper 6 is rotatably and removably attached to the machine frames 5a and 5b. In order to synchronize the rotation of the roll paper 6 and the rotation of the support shaft 7, the support shaft 7 passes through the through hole provided in the roll paper 6. It has a crimping member 7a that crimps the inner circumferential surface (see FIG. 2).

At the rear of the roll paper 6 in this device, a pair of paper feed rollers 8 are provided which pinch the leading end of the paper pulled out from the roll paper 6 and feed the paper. Each support shaft that supports the paper feed rollers 8 has a belt 9 for rotating the pair of paper feed rollers 8 synchronously.
is hung. At a position close to the bell 1-0, there is a motor 1 for feeding the roll paper 6.
1 is arranged, and the roller attached to the motor shaft of the motor 11 is in close contact with the belt 9. Thereby, by driving the motor 11, the leading end of the roll paper 6 is transported in a direction perpendicular to the width direction of the paper.

On the front side of the roll paper 6, a print head 12 for printing on the outermost surface of the roll paper 6 is arranged so as to face it. The print head 12 is guided and supported by a guide shaft 13 installed parallel to the support shaft 7, and by movement of a wire 14 provided below the print head 12, the print head 12 is moved along the guide shaft. Move along 13.

Note that the wire 14 is moved by the drive of a motor (not shown), but the mechanism for moving the head in the paper width direction uses a well-known structure, so detailed explanation will be omitted.

The print head 12 is connected to a microcomputer (not shown) via a cable 15, and print data stored in the microcomputer is output to the print head 12 via the cable 15.

On the side of the print head 12 facing the roll paper 6, as shown in FIG. 2, a contact sensor 16 for sensing the outermost peripheral surface of the roll paper 6 is provided. A signal output from the contact sensor 16 is input to the microcomputer, and the microcomputer controls a motor 17, which will be described later, based on the signal.

A gear 18 that rotates integrally with the guide shaft 13 is attached to both ends of the guide shaft 13 (only the right side is shown),
A single flat gear that meshes with the gear 18 is fixedly disposed below the gear 18. A belt 20.21 is attached to the guide shaft 13 for moving the gear 18 in mesh with the flat gear 19.
21 each extends to the front side or the rear side of this printing device. The forward extending portion of the belt 20 and the rearward extending portion of the belt 21 are respectively wound around rollers 22 and 23.
．． 23 causes the belts 20.21 to draw the guide shaft 13 toward the front or rear side of the device. The roller 22
, 23 has a shaft 24.25 passing therethrough which rotates integrally therewith, and further rollers 26, 27 attached to each of said shafts 24.25 have said rollers 22.23.
A belt 28 is attached to rotate the parts 23 in synchronization. A motor 17 for moving the belt 28 is arranged near the roller 26, and the roller attached to the motor shaft of the motor 17 is in close contact with the belt 28. Therefore, when the motor 17 is controlled to rotate in forward and reverse directions, the low 522
．． 23 rotates synchronously, the belt 20°2
1 draws the guide shaft 13 forward or backward of this device, and the gear 18 moves while meshing on the flat gear 19, so that the print head 12 approaches or separates from the roll paper 6.

Thereby, the motor 17, belts 20, 21, 28
, rollers 22, 23° 26.27, shafts 13, 24.25
, the gear 18 and the flat gear 19 constitute means for moving the print head 12 closer to or away from the roll paper 6, and the gear 18 and the flat gear 19 move the print head 12 toward the center of the roll paper 6. constitute means.

In the printing device having the above configuration, the user inserts the support shaft 7 into the through hole of the roll paper 6, attaches the support shaft 7 to the machine frame 5a, 5b, and inserts the tip of the roll paper 6 between the pair of paper feed rollers 8. be held between.

In this state, when the microcomputer drives and controls the motor 17 so that the belt 28 moves clockwise in FIG. The print head 12, which moves toward the rear of the device while meshing with the guide shaft 13 and moves integrally with the guide shaft 13, approaches the roll paper 6. Then, when the contact sensor 16 senses the outer peripheral surface of the roll paper 6, the microcomputer stops driving the motor 17.

Then, with the print head 12 in contact with the roll paper 6, the print head 12 moves along the guide shaft 13, and when the microcomputer outputs print data to the print head 12, the print head 12 is in contact with the roll paper 6. Printing is performed.

When one line of printing is completed, the microcomputer moves the print head 12 away from the roll paper 6. That is, the microcomputer determines that the motor 17 is connected to the belt 28 in the first
The drive is controlled to move counterclockwise in the figure.

Then, the roller 22 winds up the belt 20 and the gear 18
The print head 1 moves toward the front side of this device while meshing with the flat gear 19, and moves integrally with the guide shaft 13.
2 is spaced apart from the roll paper 6.

In this state, the microcomputer controls the motor 11 for a predetermined period of time so that the belt 9 moves clockwise in FIG. As a result, the paper feed row 58 feeds the paper a predetermined distance.

Note that the predetermined distance is the paper feed amount until the print head 12 faces the next print line.

Then, the print head 12 comes close to the roll paper 6 again, as in the case described above, and the same process is repeated.

As described above, in the printing device of this embodiment, the machine frame 5
A print head 12 is disposed facing a roll paper 6 which is rotatably supported by motors 17 and 18. Since the flat gear 19 and the like move the print head 12 close to and away from the roll paper 6, the platen required in conventional printing devices is no longer necessary, and the printing device becomes smaller and less expensive.

Effects] As described above, the printing device of the present invention eliminates the need for a platen that occupies a large space in conventional printing devices, making it possible to reduce the size and cost.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment embodying the present invention;
FIG. 2 is a sectional view of the embodiment. In the figure, 12 is a print head, 6 is a roll paper, 18 is a gear,
19 is a flat gear.

Claims (1)

[Scope of Claims] 1. A machine comprising a roll paper rotatably supported on a machine frame, a print head disposed opposite to the roll paper, and means for moving the print head close to and away from the roll paper. . A printing device, wherein the print head prints on the outermost peripheral surface of the roll paper. 2. The printing device according to claim 1, wherein the means for approaching and separating the print head includes means for moving the print head toward the center of the roll paper.