JPS584685Y2 - serial printer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reciprocating printing serial printer that detects the position of the print head and raises the head of the print head when feeding printing paper.

FIG. 1 shows a head-up mechanism of a conventional serial printer.

In Fig. 1, 1 is a print head, 2 is a drive source for horizontal head feeding, 3 is printing paper, 4 is a spring, 5 is a platen, and 6 is a solenoid for head up. The printing paper 3 is reciprocated in the lateral direction by the feeding drive source 2 .

The print head 1 is pressed against the platen 5 with the printing paper 3 held between the springs 4 during printing, but when printing is finished and the printing paper 3 reaches both ends, a silenoid is used to reduce the paper feeding load on the printing paper 3. 6 performs a heads up.

Therefore, in order to perform head-up, solenoid 6 and
This has the disadvantage that a drive circuit is required, making the device complex.

The purpose of the present invention is to eliminate this drawback and simplify the device.1. This will be explained in detail below.

2 and 3 show embodiments of the present invention, with FIG. 2 being a perspective view and FIG. 3 being a sectional view.

1 is a print head, 3 is a print paper, 5 is a platen, I is a drive source, 8 is a lead screw shaft, 9 is a magnet, 10 is a back plate, 11 is a front plate, 12 is a buffer material, 13 is a Hall element IC. be.

The lead screw shaft 8 is rotated by the drive source 1, but the guide groove of the J lead screw shaft 8 is a closed loop, so if the drive source γ is rotated in one direction,
The print head 1 moves in the lateral direction of the print paper 3 and repeats back and forth printing.

A magnet 9 is attached to the print head 1, and during printing, the magnet 9 tries to attract the back plate 10 made of ferromagnetic material and presses the print head 1 against the platen 5.

Next, when the print head 1 comes to both ends of the print paper 3, the back plate 10
disappears, and instead the magnet 9 is attracted to the front plate 11 via the buffer material 12, causing the print head 1 to head up.
During this time, the printing paper 3 is line-feeded.

! The magnet 9 attached to the print head 1 is also used to detect the position of the print head 1 by actuating a Hall element ICl3 installed near the front plate 11.

As explained above, in the above-mentioned embodiment, by effectively using the magnet attached to the print head, there is no need for a solenoid for the hand socket or a spring for pressing the print head against the platen, so the mechanism is simplified. Moreover, the additional effect of being able to detect the position of the print head is obtained.

Since the present invention has a simple mechanism with fewer parts, it can be used in small thermal or discharge type serial printers.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a head amplifier mechanism of a conventional serial printer, and FIGS. 2 and 3 are a perspective view and a sectional view of this embodiment, respectively.

Claims (1)

[Scope of utility model registration request] A print head 1 that performs printing with a platen 5, a magnet 9 attached to the print head 1, a lead screw shaft 8 in which a guide groove of the print head 1 is formed in a closed loop, and a lead screw shaft 8 that is connected in one direction. a driving source I that rotates the lead screw shaft 8; a ferromagnetic front plate 11 that is provided near both ends of the lead screw shaft 8 and that raises the print head 1 by attracting the magnet 9; 1. A serial printer comprising: a ferromagnetic back plate 10 which is located in between and which presses the print head 1 against the platen 5 by attracting the magnet 9.