JPS588677A - Printing device - Google Patents

Abstract

PURPOSE:To miniaturize a printing device wherein letters are printed with a printing head in contact with recording paper by conducting the pressurized contact of the printing head with the recording paper and the pressurized contact of the pinch roller with the rubber roller by means of one pressurized contact. CONSTITUTION:The lower section of a holder 29 is supported freely rotatably by means of a pinch roller shaft 36. Both ends of a pinch roller shaft 36 are mounted on a body 35 by inserting them in long holes 38 that are formed on the both sides of the body 35 and they are constituted to move freely in the long holes 38. The holder 29 is urged forward (in the direction of the arrow mark A) by the elastic force of a plate spring 41 on the back face of the holder 29 and at the same time the pinch roller shaft 36 moves forward along the long hole 38 to press a pinch roller 37 onto a rubber roller 42. The pressurized contact of the plate spring 41 gives force to rotate forward (in the direction of the arrow B) the holder 29 with the pinch roller shaft 36 as center, and a platen 30 on the holder 29 is pressed against the printing head 28.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing device that performs printing by bringing a print head into pressure contact with recording paper.

Conventionally, there is a printing device of this type as shown in FIG. 1, and this device will be explained below. A carriage 2 carrying a print head 1 is supported on a slide rail 3 so as to be slidable in its longitudinal direction. A pressure contact lever 4 is attached to the end of the slide rail 3, and a coil spring 5 is connected to one end of the pressure contact lever 4. Due to the action of the pressure contact lever 4 and the coil spring 5, the print head 1 is attached to the platen. It is biased in six directions so as to come into pressure contact with the recording paper 7. Furthermore, the carriage 2 is driven by a drive motor 8.
connected to a wire 10 wound around a gooley 9;
It moves on the system slide rail 3 by the rotation of the drive motor 8. As the carriage 2 moves, the print head 1 prints on the recording paper 7. Further, when printing for one line by the print head 1 is completed, the middle spear 2 returns to its original position and the rotation of the drive starter 11 is stopped by the pulley 12.
, is transmitted to the rubber roller 15 via the belt 13 and pulley 14, and the recording paper 7 is fed by the uneven roller 15 and the ginch roller 16. In this case, the two-inch roller 16 is pressed against the rubber roller 15 by a lever 17 and a coil spring 18, and holds the recording paper 7 between them.

However, in the conventional printing device as described above, the means for pressing the print head 1 against the recording paper 7 and the means for pressing the pinch roller 16 onto the gym roller 15 and pinching the recording paper are separate. There is a problem in that the fact that the printer is provided in the printer makes it difficult to downsize the printing device.

The present invention has been proposed to solve the above problems, and its purpose is to make it possible to press the print head against the recording paper and press the pinch roller against the rubber roller using one pressure contact means. The object of the present invention is to provide a printing device that can be simplified and downsized.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings showing one embodiment.

FIG. 2 is a plan view of an embodiment of the present invention, FIG. 3 is a front view thereof, FIG. 4 is a right sectional view thereof, and FIG. 4 is a sectional view taken along line D-D in FIG. 4. In figure 5,
The drive motor 20 such as a pulse motor is a gear 21.22.2
3 to the lead screw 24. Therefore, the lead screw 24 rotates in forward and reverse directions as the drive motor 20 rotates. 3- is supported on the lead screw 24 with a carriage 25 fitted thereon, and the seat 1 is further fixed to the carriage 25, but the idle pin 26 is engaged with the helical guide groove 27 on the lead screw 24 (the id pin 26 is engaged with the spiral guide groove 27 on the lead screw 24). 3 causes, Figure 4). In this case, the carriage 25 slides along the longitudinal direction of the lead screw 24 as the lead screw 240 rotates. Also,
A print head 28 is attached to the carriage 25 (FIGS. 2 and 4).

Next, reference number 29 is a holder for supporting the platen 30, and the part #$32 provided on the back side of the 7° latin 30 fits into the band-like protrusion 31 provided on the upper front surface of the holder. The l platen is supported at 3° (Figs. 2 and 4). Here, the height of the band-shaped protrusion 31 is equal to the height of the groove 32.
Since the depth and width of the platen 30 is large, the platen 30 is
1 as a fulcrum, it is possible to move in an arc relative to the holder 29 (FIG. 4). Further, on the opposite side of the carriage 25 from the platen 30, a guide 33 is formed integrally with the print device 35 over the entire width of the recording paper 34, and is configured to clamp the upper part of the carriage 25 together with the platen 30. The carriage 25 is disengaged by moving along the lead screw 24 while being sandwiched between the guide 33 and the platen 30.

On the other hand, the lower part of the holder 29 is rotatably supported by a pinch roller shaft 36, and pinch rollers 37 are similarly connected to the pinch roller shaft 36 at the constricted portions on both sides of the lower part of the holder 29.
6 is supported for multiple rotations (Fig. 4, Fig. 5)
. Both ends of the pinch roller shaft 36 are inserted into and attached to elongated holes 38 formed on both sides of the body 35, and are configured to be movable within the elongated holes 38 (Fig. 4).
. Furthermore, two support protrusions 39 and 39' are provided on the back surface of the holder 29 at a predetermined interval. A plate spring 41 fixed to the fixing hole 40 is in pressure contact with the fixing hole 40 (FIGS. 4 and 5). The holder 29 is pushed forward (in the direction of the arrow) by the elastic force caused by the pressure of the leaf spring 41, and the pinch roller shaft 36 overflows the length 38 and moves forward.
It will be pressed against the top. This rubber roller 42 is connected to a drive motor 46 such as a pulse motor via wheels 4a, 44 and 45, and rotates for paper feeding.

On the other hand, the pressure contact of the leaf spring 41 applies a forward rotational force (in the direction of arrow B) about the pinch roller shaft 36 to the holder 29, so the platen 30 on the holder 29 moves the print head 28 together with the guide 33. Attached carriage 25
(Fig. 4). As a result, the printing pressure of the print head 28 against the recording paper 34 can be obtained. In this case, since the platen 30 moves in an arc relative to the holder 29 as described above, its surface does not follow the movement of the surface of the print head 28, so that a proper contact surface can always be obtained. be.

Further, the holder 29 has supporting protrusions 39°39 spaced apart from each other.
Since the plate spring 41 is in pressure contact with the plate spring 41 at two locations through the holder 29 and receives elastic force, the horizontal wobbling of the holder 29 is effectively suppressed and the parallelism between the surface of the platen 300 and the surface of the guide 33 is maintained.

Next, the operation of the printing device configured as described above will be explained. First, during the printing operation, the lead screw 24 rotates clockwise as viewed from the right side in FIG. 3 as the drive motor 20 rotates. direction). At this time, since a pressure of 1/Cf latin 3° is applied to the leaf spring 41 on the print head 28, the print head 28 performs the printing operation while contacting the recording paper 34. When the printing head 28 finishes printing one line, the lead screw 24 rotates counterclockwise when viewed from the right in FIG. 3, so the carriage 25 moves leftward and returns to its original state. At the same time, the rotation of the drive motor 46 is transmitted to the rubber roller 42, and the recording paper 34, which is held between the rubber roller 42 and the pinch row 237 by the leaf spring 41, is fed by the rotation of the rubber roller 42. be.

Since the printing device according to the present invention is constructed and operates as described above, it provides the following effects.

9-8- Since the printing pressure of the print head against the recording paper and the pressure contact of the pinch roller against the uneven roller can be obtained simultaneously with one leaf spring, the structure of the printing device can be simplified. Furthermore, the device can be made smaller.

In the above-described embodiment of the present invention, separate drive motors are used for carriage feeding and paper feeding, but it is possible to use a clutch mechanism etc. to move the carriage The present invention can also be applied to a printing device that performs sheet feeding and paper feeding.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a conventional printing device, FIG. 2 is a plan view showing an embodiment of the printing device according to the present invention, FIG. 3 is a front view of the embodiment, and FIG. 5 is a right sectional view of the portion taken along line CC in the figure, and FIG. 5 is a sectional view of the portion taken along line 10-D in FIG. 4. Here, 20... drive motor, 21.22.23...
・Gear, 24... Lead screw, 25... Carriage, 26... Guide bin, 27... Guide groove,
28...Print head, 29...Holder, 30...
platen, 31... band-shaped projection, 32... groove, 33.
... Guide, 34 ... Recording paper, 35 ... is D, 3
6...Pinch roller shaft, 37...Pinch roller, 3
8...Elongated hole, 39, 39'...Support protrusion, 40...
・Fixing hole, 41... plate spring, 42... are smooth rollers,
43.44.45...Gear, 46...Drive motor. 11- Day 1

Claims (2)

[Claims] (1) In a printing device that prints while the print head is in contact with the recording paper, the print head is pressed by applying pressure from an elastic member to a holder consisting of a platen on the front and a pinch roller on the bottom. The printing device is characterized in that a printing pressure is applied from the platen side, and an expansion pinch roller is brought into pressure contact with a rubber reeler for paper feeding. (2) The printing device according to claim 1, wherein the platen is movably held within a predetermined range on the front surface of the holder.