JPS5955776A - Printer - Google Patents

Abstract

PURPOSE:To make it possible to prevent the contact of paper and an ink ribbon, in the printer due to the ink ribbon, by forming a slit to the guide plate of a printing head side over the entire printing length thereof in a necessary min. width. CONSTITUTION:A slit 7d is formed to the guide plate 7B provided to the side of the printing head 12 of a printer over the entire length to be printed thereof in a necessary min. width performing printing due to the printing head 12. Therefore, the guide plate 7B performs the action of a ribbon mask and the contact of paper 5 and the ink ribbon 3 can be prevented even if the ribbon mask is separately provided to a carrier 11. In addition, the contact of the paper 5 with the side of the carrier 11 is prevented as well as friction force is not acted between the paper 5 and the carrier 11 and the load of a carrier driving motor is reduced to make it possible to miniaturize a printer while the carrier structure can be simplified and miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION 0) Technical Field of the Invention The present invention relates to a printer without a ribbon mask in the carrier.

■ Background of the Technology Generally, printers require a function to prevent the ink ribbon from coming into contact with the paper and staining the paper.

(3) Prior art and problems Figure 4 is a plan view showing a conventional printer, Figure 5 is a front view showing the printing state of the printer in Figure 4, and Figure 6 is an enlarged view of the print head section of the conventional printer. It is a diagram.

Conventionally, the carrier 11 for moving the print head 12 of this type of printer 1 has a ribbon mask 6 for separating the ink ribbon 3 and the paper 5, as shown in FIGS. 4 to 6.
However, when the paper 5 becomes thicker, the paper 5 and the mask 6 come into contact with each other with strong contact pressure, which adds a load to the drive of the carrier 11 (i.e., there is a large amount of pressure between them). ), it would be foolish to use a large motor as the carrier drive motor, or carrier 1
1 itself also had the drawback of requiring a sturdy and large structure.

(4) Object of the Invention The object of the present invention is to provide a printer that does not require a ribbon mask on the carrier, in order to eliminate the above-mentioned drawbacks.

(5) Structure of the Invention In other words, the present invention is constructed by forming a slit along the entire length of the print head in the guide plate on the print head side, with a minimum width necessary for the print head to print.

(6) Examples of the invention Hereinafter, the present invention will be described in detail based on the drawings.

FIG. 1 is a plan view showing an embodiment of the printer according to the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is a sectional view taken along line I-■ of the slit portion of the printer of FIG. 1. .

As shown in FIGS. 1 to 3, the printer 1 has a pathway 9 formed from guide brakes 7A and 7B, and a plate 7B of a print head 1211jl, which will be described later.
7d is formed over the entire length to be printed. An endless ink ribbon 3 is provided on the right side of the sulin) 7d in FIGS. 1 and 2, stretched between rollers 10A and 10B provided near both ends of the sulin) 7d. Furthermore, to the right of the ribbon 3 is a print head 12.
is mounted on a carrier 11 so as to be movable and driveable in the directions of arrows A and B in FIG. 1, which are the printing directions. Ribbon guides 12a and 12b are provided at the tip of the head 12, and the guides 12a and 12b can position and hold the ink ribbon 3 between the head tip and the slit portion. On the other hand, a conveyance roller 13 is provided on the roller 10B so as to hold the ribbon 3 under pressure between it and the roller 10B, and a motor 16 is connected to the row 213 via a clutch 15. Further, for the pathway 9, a platen 17 on which a spring 21 is tensioned is provided so as to be able to protrude and retreat in the directions of arrows C and D around the bin 17&, in a form that faces the slider 7d. Lever 1 of platen 17
A plunger magnet 20 is provided on 7b via a spring 19 so as to be freely protrusive and driveable in the directions of arrows B and F. Note that the leading edge of the paper 5 inserted in the direction of arrow C is located directly above the slit 7d of the guide brake) 7B in the slit 7B.
A guide spring 7e is provided so that the guide spring 7e does not get caught in the guide spring 7e.

Since the printer 1 has the above configuration, the paper 5
When printing is to be performed, the paper 5 is inserted into the pathway 9 from above in the direction C in the figure, as shown in FIG. 2, and set at a predetermined printing position. Next, the plunger magnet 20 is excited and driven in the F direction, and the platen 17 is moved against the pin 17a via the lever 17b against the elasticity of the spring 21.
, protrude in the C direction, that is, in the direction of pathway 9,
Press the paper 5 onto the guide plate 7B with a predetermined pressure. In this state, the carrier 11 is driven in the direction of the arrow A%B together with the print head 12, and printing is performed on the paper 5 through the sulin) 7d. Since the guide plate 7B is formed to the minimum size required for printing, the guide plate 7B serves as a ribbon mask, and the ribbon 3 and the paper 5 will not come into contact with each other during printing and the paper 5 will not be soiled. Also, the platen 17 is
In the state of protruding in the direction, the clutch 15 is in a disengaged state), and the rotation of the motor 16, which is constantly driven, is not transmitted to the transport row 213. Therefore, the ribbon 3 is not fed during printing by the print head 12,
Even if the ribbon 3 and paper 5 are partially in contact with each other due to slack in the ribbon 3, etc., the ribbon 3 will not move relative to the paper 5, so staining of the paper 5 can be minimized. .

When printing for one line is completed and the printing operation is temporarily interrupted due to a line feed, etc., the excitation of the plunger magnet 20 is released, and the lever 17b is returned to the E direction by the elasticity of the spring 21, so that the platen IT retreats in direction D. Then, the paper 5 that had been pressed in the direction of the guide plate 7B until then
The pressed state is released, and the paper 5 passes through the slit 7d,
Therefore, it separates from the ink ribbon 3. On the other hand, magnet 2
0 is de-energized, the clutch 15 is connected, the roller 13 is rotationally driven by the motor 16, and the ribbon 3 is sent in a predetermined direction. At this time, as mentioned above, form 5
is located away from the ribbon 3 in the busway 9, so when the ribbon 3 is fed 9, the ribbon 3 and the paper 5 come into contact,
There is no chance that the paper 5 will become soiled.

σ) As described in the detailed description of the invention, according to the invention, the print head 121
Since the guide plate 7B of 111 is formed with a slit 7d extending over the entire length to be printed with the minimum necessary width W for the print head 12 to print, the plate 7B can serve as a ribbon mask. The paper 5 and the ink ribbon 3 can be easily attached to the paper 5 and the ink ribbon 3 without separately providing the ribbon mask 6 on the carrier 11.
It is possible to prevent contact with force. Therefore, since there is no contact between the carrier 11 side and the paper 5, the paper 5
Since no frictional force acts between the carrier 11 and the carrier 11, the load on the upper and lower parts for driving the carrier is reduced, and not only the motor can be downsized, but also the structure of the carrier 11 can be simplified and downsized.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the printer according to the present invention, FIG. 2 is a front view of FIG. 4 is a plan view showing a conventional printer, FIG. 5 is a front view showing a printing state of the printer shown in FIG. 4, and FIG. 6 is an enlarged view of the print head section of the conventional printer. 1... Printer 3... Ink ribbons 7A, 7B... Guide plate 7d...
・Slit 9...Busway 11...Carrier 12...Print head W...Width Applicant Fujitsu Limited Agent Patent Attorney Hiroshi Matsuoka Department 1 Figure 2 Figure 5 Figure 6 □'-9°

Claims (1)

[Claims] In a printer that has a busway formed by a guide plate (L/-), and a print head that is provided to the busway via an ink ribbon and is driven to move together with the carrier in the printing direction, the print head is attached to the guide plate on the print head side. A printer characterized in that a slit extending over the entire length of the printer is formed with the minimum width necessary for a print head to print.