JPS599081A - printing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing device, and more specifically, it performs printing while moving the print head in the main scanning direction while being in pressure contact with the recording paper, and when feeding the recording paper, the print head moves away from the recording paper. The present invention relates to a printing device that feeds paper separately.

A conventional printing device of this type is shown in FIG. In FIG. 1, the reference numeral 1 denotes a print head, which is constructed, for example, as a thermal head in which a plurality of heating elements are arranged in a vertical line. The print head 1 is fixed to a carriage 2, and the carriage 2 is slidably fitted onto a guide rail 3. The upper end of a lever 4 is fixed to -y;M of the guide rail 3 (), and a spring 5 is stretched between the lower end of the lever 4 and the fixed part of the device (], Applying force in the direction of turning the rail in the open direction in the diagram, I
], the print head 1 is pressed against the platen 6 via the recording paper 7.

A solenoid 8 is provided on the opposite side of the lever 4 from the spring 5C), and its rond tip 'f:11'+ is fixed to the lower end of the lever 4 on the opposite side from the spring 5. There is. Therefore, solenoid 8 is energized rI8
Then, the knife rail 3 is rotated in the counterclockwise direction 31Jj in the figure, and the print head 1 can be rotated in the direction without separating from the recording paper 7.

No. 71 9-C What is not shown is the motor c1. V between the pulley 10 fixed to its output shaft and the driven pulley (not shown)
In this figure, an endless wire 11 is stretched (), and the first gear A/ridge 2 is fixed in the middle of the endless wire 11, and the carriage 2 is reciprocated with the rotation V of the motor 9, as shown in FIG. A heat-generating element (not shown) generates heat according to a printing command, and printing is performed.

On the other hand, what is not shown with ladle number 12 is the paper feed motor, and the pulley 13 fixed to its output shaft is connected to the belt 14.
! ii is cut out [), and the other end of the -\filtration 14 is enclosed in a paper feed 15 fixed to a shaft +6a to which a paper feeding roller 16 is fixed.

The recording paper 7 is guided between the paper feed [-1-ra 16 and the pinch roller 17 (), and then the recording paper 7 is guided between the paper feed [-1-ra 16 and the pinch roller 17], and then the recording paper 7 is guided between the paper feed [-1-ra 16 and the pinch roller 17], and then the recording paper 7 is guided between the paper feed [-1-ra 16 and the pinch roller 17]. is almost [<
-y1'1°1: of the lever 18 formed in the shape of the letter 1 is rotatably supported, and the other end of the lever 18 and the device 6
A spring 19 is stretched between the fixed part and the fixed part.

This spring/g 19 applies a force to the lever 18 in the special training direction by closing the pin 18a in the middle, and generates a frictional force to press the binding roller 7 against the paper feed roller 6 and feed the recording paper 7. It's growing.

Based on the above configuration, motor 9V is set to gear A.
When the ridge 2 is moved and one line of printing is completed, the key The print head 1 is moved away from the recording paper 7, and the paper feeding motor 2 is driven to advance the recording paper 7 by one line and perform the next printing operation.

However, in a printing device with the above structure, the print head (gear ridge) is moved by the motor 9&, and the separation of the print head from the recording paper is performed by the sotonoid 8. 12
This requires multiple driving sources, which increases the space required and hinders the printing device's performance. K was made to eliminate the drawbacks of conventional methods such as H, and 1
It is an object of the present invention to provide a printing device configured so that the print head can be moved, the print head can be separated from the recording paper, and the paper can be fed by using two drives 011.

In the present invention, in order to achieve the objective 1),
At least −・η of the platen holder supporting the platen
11:: is provided with an engaging portion that engages with the gear ridge, and the platen holder is rotatably supported via a shaft as shown in the print head W (11), and a pinch roller is always attached to this shaft. A structure was adopted in which a paper feed roller that is pressed into contact with the paper feed roller is provided, and a one-sided clutch mechanism that transmits a force for rotating the shaft only in the paper feed direction to this II+l+ is provided.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

Figure 2 and the following diagrams explain one embodiment of the present invention.
The figure shows the overall structure.

In FIG. 2, the reference numeral 20 indicates a platen holder, and a platen 21 is attached to the front side 1 (1111) of the platen holder 2o. It is rotatably supported on a shaft, and a spring 23 is elastically loaded between the side opposite to the platen 21 and a fixed part of the device, and a gear mechanism (1
The habit of turning towards 11! It is being tested.

The shaft 22 also has both ends of the platen holder 2o.
The paper feed roller 24 is fixed at the position [11]. A pinch roller 2 is located below and in front of the paper feed roller 24.
5 are in contact with each other, and a recording paper 26 is held between them.

Further, on one side 5 of the platen holder 20, for example, the left end in FIG. has been done.

A screw shaft 29 rotated by a motor 28 is arranged parallel to the platen at a position opposite to the platen 21.
A carriage 3° is slidably fitted onto this screw shaft 29, and a protrusion 31 provided on this key A ridge 3o is fitted into the thread L:) m 29 a of the screw shaft 29. .

Follow-C1 Tanabata 28 is forward and reverse? The shaft 29 can also be rotated to the right along the L shaft 29 along the A shaft 30t.

Father, -t-A-Ridge 3CN/(m is provided with a print head 32 facing the brush 1-721, and the platen 21 pressed by a spring 23 is in contact with the print head 32.

Further, a protrusion 33 of a predetermined length is provided on the side surface of the engaging portion 27 of the gear A' ridge 30. This protrusion 33 engages with the engaging portion 27 when the gear ridge 30 returns to position 1. iI is in a certain position.

The carriage 30 is guided by a V-shaped guide rail 34 so as not to rotate as the screw shaft 29 rotates.

By the way, the shaft 22 fixed to the lower part of the platen boulder 20 has its both ends rotatably supported on the right side plate of the printing device (not shown in the figure). At the center of the lower end of the platen holder 20 - C11
1+22 is fitted with a coil spring 35, which is a spring clutch illustrated as an example of a one-sided clutch. This coil spring 35 -'11"1 (: is the platen boulder 20
-1 other 'Ji1i high'll'll 22 V cofi'
+1, the platen holder 2o is wound around the rotation handle tlL lqb 22 in the counterclockwise direction in FIG. ing.

Of course, the platen holder 2o in Figure 2 is ++;! If they are moved in the same direction as the old direction, the coil spring 35 is loosened, and the platen holder 2o and the platen holder 2o are in the free position.

Next, the operation of the printing apparatus according to the present invention configured as above will be explained.

r1〒 , , ,
During printing operation, as shown in Figure 3 (a) and (b),
-A. The protrusion 33 protruding from the ridge 30 extends from the engaging portion 27 provided at the left end of the platen holder 20, and the platen holder 2o is pushed by the spring 23V and the recording paper 26 is pushed against the print head 32Vc. The platen 21 is being pushed through. In this state, when the Tanabata 28 is rotated and the screw shaft 29 is rotated so that the carriage 30 moves to the right in FIG. Follow -C1
The ripening material not shown in Figure 1 is heated and printing is performed.

When the printing at the predetermined end position of one line is completed in this manner, the motor 28 rotates in the reverse direction, and the print head 32 returns to the position 1 and position 7 together with the gear ridge 30.

When the gear ridge 30 approaches the home position/con, the projection 33 comes into contact with the cam surface of the engaging portion 27 and rides on it, as shown in FIGS. 4(a) and 4(b). Since the carriage 30 can only move the screw shaft 29 in the linear direction, the engaging portion 27 is pushed by the protrusion 33, and the platen holder 20 is rotated in a direction away from the print head 32 against the elastic force of the spring 23. be moved. At the same time, coil spring 3
5 is 1i11122 Since the platen holder 20 with IfC winding order 1 and the support 22 are integrated, the platen boulder 2
Rotation 0 is achieved by rotating +11122 by a predetermined angle in the counterclockwise direction in FIG. 26 is sent for one line. This paper feed amount is determined by the rotation of the paper feed roller 24, so if the timing at which the platen holder 20 and the support 22 are integrated is properly set by the coil spring 35, which is a negative direction clutch, it will be possible to accurately Paper is fed by line.

In addition, since the platen 21 and the print head 32 are separated during group feeding, the print head 32 does not interfere with paper feeding.

After the paper is fed in this way, the gear ridge 30
If the projection 33 is moved a predetermined distance to the right in FIG.
The print head 32 is pressed against the recording paper 26 by being rotated by the ridge 3o. If I start printing in this state, will the next line be marked? can be done.

The platen holder 20 is attached to the carriage 30
When rotating f, the spring 35 loosens, so
No rotational force is transmitted to r+ql+22, and paper feeding is not performed.

In this way, the drive source uses only one Tanabata 28 to move the print head, feed the paper, and write the print head:
It is possible to create an inexpensive printing device with a small size of 11.9 mm, which can perform the separation operation from the paper and print with high accuracy.

By the way, in the above embodiment, the engaging portion 27 and the protrusion 3
3 is provided only on one side (lili), but it is also possible to provide it on the other side.Also, contrary to the embodiment shown in FIG. 7;7.
It may be provided on the j side.

The engaging portion 27 and the protrusion 33 can be connected to both the platen boulder 2° and the gear ridge 30 (if the carriage 30 is installed at the till, the carriage 30 is on the left and right of the recording paper 26, and the carriage 30 is on both the left and right side of the recording paper 26, and the carriage 30 is used for paper feeding and recording paper). The print head can be moved away from the print head. This kind of (1,1,li construction is adopted, f
l.

For example, it is possible to perform printing in the 71 return movement of the gear ridge 11.5'' without performing the wasteful operation of gear ridge return, and it is possible to increase the printing speed.

As is clear from the above description, according to the present invention, a print head is provided on a carriage screwed onto a screw shaft that is rotated forward and backward by a drive motor, and a platen holder that has been removed is attached to the print head. (A spring V is provided so as to be in pressure contact with the till so that it can be rotated freely with the rotational property increased by +5, and a paper feed [1-] is provided on the support that supports this platen boulder, and a platen holder and its shaft support are provided. A single-force surface clutch is provided between the shaft and the platen holder to integrate the platen holder and the bearing shaft when the platen holder is rotated away from the print head, and the carriage is attached to at least one end of the platen holder. (till
When it moves to , it engages with a protrusion protruding from the gear ridge,
Rotate the platen holder in the direction V away from the print head.The platen holder is rotated in the direction V away from the printing head.The structure is equipped with a retaining section, which prevents the movement of the print head, the paper feed operation, and the separation of the print head between the recording sheets. Operation can be performed with one driving source,
It is possible to obtain a small and inexpensive printing device with a small number of parts.

[Brief explanation of drawings]

Figure 1 is a small perspective view of an example of a conventional structure, Figures 2 to 1
Figures (a) and fb) illustrate one embodiment of the present invention; Figure 2 is a perspective view, and Figure 3 (a) and +1)) are enlarged plan views and side views of essential parts during printing operation. , Figure 4(a),
Q)) is an enlarged plan view of the main parts during paper feeding operation. Side view of paralysis 7th grade 620...Platen boulder 21...Platen 22...Shaft 23...Spring 24...Paper feed roller 25. Pinch [-1-ra26...Recording paper 27. ...Engagement part 28...
・Motor 29...Screw shaft 30...Gear ridge 32...Print head 33...Protrusion 3rd (Q) 4th (C1) (b) 6 Figure (b) 6 25 7n 14

Claims (1)

[Claims] In a printing device that performs printing while moving the print head in pressure contact with recording paper, it has a retaining part that is moved back and forth by a drive motor and engages with a protrusion protruding from a carriage to which the print head is attached. A platen holder is provided which is given the ability to rotate in the direction in which it is pressed into contact with the head, and a clutch is provided for this platen holder, and when the protrusion of the carriage and the platen holder come into contact, the platen holder is separated from the print head and rotated in the one direction. A printing device characterized in that the platen holder and the shaft are integrated by a clutch.