JPS582607Y2 - small printing device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to the structure of a small printing device.

Conventionally, printing devices often use round platens for feeding printing paper, and the paper feeding system has a platen with a predetermined diameter due to the bending radius of the paper, etc. Furthermore, in order to satisfy the functions of the printing device, driving motors,
It was necessary to place an ink ribbon for printing.

For this reason, there was a drawback that the entire printing device became large.

Therefore, in the present invention, the platen is curved into a U-shape, and a unit constituting the printing device is installed and arranged inside the platen and along the ridge line.
This provides a compact printing device.

The present invention utilizes a paper feeding device of an invention related to a printer that the applicant has separately filed as Japanese Patent Application No. 54-62140, and this paper feeding device has a U-shaped friction member that functions as a one-way clutch. Paper is fed by moving in the paper feeding direction while pressing the printing paper against the outer bottom of the platen.

In other words, this friction member is attached to a rocking plate that has a protrusion (protrusion) that engages with a groove that is parallel or inclined to the printing surface provided at the bottom of the carriage that reciprocates in the printing line direction. The rocking plate is configured to reciprocate in the sheet feeding direction by the cooperation of the groove and the protrusion.

An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is a plan view showing one embodiment of the present invention, and Fig. 2 is a plan view showing an embodiment of the present invention.
It is an AA' cross-sectional view of the figure.

In FIGS. 1 and 2, reference numeral 1 denotes a print head, and a dot head is shown as an example.

2 is a carrier on which the print head 1 is mounted; 3 is a guide shaft for regulating the sliding path of the carrier 2; 4 is a guide shaft for regulating the sliding path of the carrier 2;
is a paper feeding mechanism, in which a friction member (not shown) having the function of a one-way clutch moves in the paper feeding direction while pressing the printing paper against the outer bottom of a U-shaped platen, which will be described later, to feed the paper. Let's do it.

In other words, this friction member has a protrusion (or groove) that engages with a groove (or protrusion) (not shown) that is provided at the bottom of the carriage 2 that reciprocates in the printing line direction and is parallel or inclined to the printing surface. ) 4a, and this swing plate moves forward when the carrier 2 moves to the left, and moves backward when the carrier 2 moves to the right. The friction member attached to this swing plate feeds the printing paper 5 by l pitches only when the swing plate moves forward.

Reference numeral 6 denotes a platen made of a thin plate curved into a U shape, which is disposed opposite to the print head, and has paper guides 6a and 6b at both ends thereof to hold the printing paper.

7 is a paper storage section located behind the platen 6;
1 is a drive motor housed inside the platen 6 on the right side (or left side); 9 is a drive gear connected to the motor 8; 10 is a driven gear meshing with the drive gear 9; 11 is the driven gear. Left-handed and right-handed endless grooves (or protrusions) 11a connected to 10
The screw shaft 11 passes through a through hole provided in the carrier 2, and the protrusion (or recess) at the tip of the pin inserted from the outside of the carrier toward the through hole is inserted into the groove of the screw shaft. By engaging with the screw shaft, the carrier slides from side to side by rotation of the screw shaft in one direction.

13 is provided inside the platen 6 and is connected to the motor 8.
This is an ink ribbon cartridge equipped with ink ribbon guides 13a and 13b, which are cut out at the part that overlaps with the ink ribbon, and are used to guide the ink ribbon over the entire printing width on the print head side.As shown in the figure, the ribbon guides 13a and 13b are The ink ribbon is pulled out and stretched from a notch (not shown) that protrudes to sandwich the print head 1 and is provided in the side wall facing the print head 1.

It should be noted that stretching the ink ribbon in this way is a common practice, for example, in
04 is also shown.

As explained in detail above, according to the present invention, the platen is curved into a U shape and formed of a thin plate to form a paper feeding route, and a driving motor is installed in the gap inside the platen. By arranging an ink ribbon cartridge and an ink ribbon cartridge, and further arranging a feeding mechanism which slides back and forth as the carrier slides from side to side to feed the paper, a compact printer can be constructed.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA'. 1...Print head, 2...Carrier, 3...Guide shaft, 4...Feeding mechanism, 5...Print paper, 6...Platen, 7...Paper storage section, 8......
・Motor, 11... Screw shaft, 13
・・・・・・Ink ribbon cartridge, 13a s
13 d... Ink ribbon guide.

Claims (1)

[Scope of utility model registration request] A printing device that performs printing by moving a carrier carrying a print head along an ink ribbon stretched parallel to a platen that supports the printing paper, and feeding the printing paper perpendicular to the platen. The platen is curved into a U-shape, and inside the platen there is provided a drive motor and an ink ribbon cartridge with a cutout in the part that overlaps with the drive motor and an ink ribbon cartridge that pulls out the ink ribbon from both ends. On the outside of the platen, there is a paper accommodating section for storing printing paper at the rear, a carrier carrying the print head at the front, and a friction member presses the printing paper at the bottom of the outer bottom of the platen to feed the paper. A paper feeding mechanism that feeds paper by moving in the feeding direction is provided, and this friction member has high frictional resistance only in one direction and is provided at the bottom of the carrier and is parallel or inclined to the printing surface. A compact printing device characterized in that it is mounted on a rocking plate that is provided with a convex portion (or groove) that engages with a groove (or convex portion) in which the printer is placed, and that swings in the paper feeding direction as the carrier moves.