JPS597073A - Printer - Google Patents

Abstract

PURPOSE:To obtain a low-cost printer using lesser numbers of parts by using a system in which a head holder is pushed toward a platen side by a spring and the head holder is separated from the platen by coupling the projection of the head holder with the coupling part of the platen holder. CONSTITUTION:A head holder 22 provided to a printing head 24 is slidably attached, together with a carriage 20, to a guide rail 21 in the carriage 20 to be reciprocally moved by a drive motor 29. The head holder 22 is always pushed toward a platen 27 by a spring 23 and then turned toward the direction of being separated from the platen 27 by the coupling of the projection 25 with the coupling part 28. By one drive motor 29, the moving of the printing head 24, the separation of the printing head 24 from recording paper 37, and the feeding of the papers can thus be performed.

Description

[Detailed Description of the Invention] Misfire 1yJ relates to a printing device, and more specifically, printing...
The present invention relates to a printing device in which recording is performed while moving the radar in the main scanning direction while in contact with the recording paper, and when the recording paper is fed, the printing head is separated from the recording paper to feed the paper.

This conventional printing device is shown in FIG. In FIG. 1, the print head designated by reference numeral 1 is constructed as a thermal head in which a plurality of heat generating elements are arranged in a vertical line, for example. A print head 1 is fixed to a carriage 2, and a gear ridge 2 is slidably connected to a kite rail 3. The upper end of a lever 4 is fixed to one end of the kite rail 3, and a link 5 is stretched between the lower end of the lever 4 and the fixed part of the device, and the guide rail 3 is moved in the open direction in the figure. The force in the rotating direction is applied to press the print head 1 against the platen 6 via the recording paper 7.

A solenoid 8 is provided on the opposite side of the lever 4 from the sprinkling link 5, and the tip of the solenoid 8 is fixed to the lower end of the lever 4 on the opposite side from the sprinkling link 5. Therefore, when the solenoid 8 is energized, the guide rail 3 is rotated in the counterclockwise direction in the figure, and the print head 1 can be rotated in a direction away from the recording paper 7.

The reference numeral -89 is a motor, and an endless wire Y11 is stretched between a pulley 10 fixed to its output shaft and a driven pulley (not shown). 2 is fixed, and as the motor 9 rotates, the carriage 2 is moved back 71, and a heating element (not shown) generates heat in accordance with a printing command, and printing is performed.

On the other hand, the reference numeral 12 is a paper feeding motor, and one end of a belt 14 is hung around a boo 913 fixed to its output shaft.
6 is hung on a pulley 15 fixed to a fixed shaft 16a.

The recording paper 7 is guided between a paper feed roller 16 and a pinch roller 1, and a shaft 17a on which a pinch roller 17 is rotatably mounted has a shaft 17a at both ends shaped like the letter "<". One end of the formed lever 18 is rotatably supported on a shaft, and a spring 19 is stretched between the other end of the lever 18 and the device fixing part.

The spring 19 applies a force to the lever 18 in the opening direction around the pin 18a, and provides a frictional force for pressing the pinch roller 17 against the paper feed roller 16 and feeding the recording paper I.

When the carriage 2 is moved by the motor 9 and printing for one line is performed based on the configuration as shown in (2) below,
The carriage 2 returns to the home position, the solenoid 8 is energized, the guide rail 3 is rotated counterclockwise in FIG. 1, and the print head 1 is separated from the recording paper 1.
The paper feed motor 12 is driven, and the recording paper 7 is fed by one line to perform the next printing operation.

However, in a printing device having the above structure, the movement of the printing head (carriage) is performed by the motor 12, which requires multiple driving sources, which increases the space occupied and prevents miniaturization of the printing device. It was the cause.

The present invention was made in order to eliminate the following drawbacks of the conventional technology, and uses a single drive motor to move the print head back and forth, and to move the print head to and from the recording paper. +1 to be able to do it? The purpose of this invention is to provide a printing device that has the following features.

In the present invention, in order to achieve the second object, a print head is provided via a head holder on a rotatable VCIt (combined) guide rail that guides a carriage, and this print head is attached to a C through a recording paper. The platen (till) is given the same movement by a spring in the direction of pressure contact, and the platen holder 1 α; 1.1 is provided with a retaining part that engages with a projection provided on the side edge of the head holder. A structure was adopted in which the movement of the head holder is transmitted to the paper feed roller via a clutch gear.

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

2 to 4 illustrate one embodiment of the present invention. In each figure, the reference numeral 20 is a carriage, and this gear ridge is mounted on a guide rail 21 and rotatably supported. Both ends of the knobby handle 21 are rotatably supported on a side plate of a printing device (not shown) or the like.

A head holder 22 is attached to this carriage 20, and the head holder 22 is attached to the former guide rail 2.
1 and is fitted in a sliding manner with respect to Pi. A spring 23 is loaded between the head holder 22 and the carriage 20, and prevents the head holder 22 from moving away from the carriage 20.
, 5 has been raised.

A print head 24 is fixed to the front surface of the head boulder 22 (a protrusion 25 is provided on the side edge of the head holder 220, the left side edge in FIG. 2).

A platen holder 26 is arranged opposite to this print head 24. The platen holder 26 is fixedly arranged, and a platen 27 is provided on the front side (till side) facing the print head 24, and a cup protruding toward the print head 24 side is provided on the side line on the same side. The gear ridge 20 is guided without rotating by the guide plate 20a.

Therefore, the print head 24, together with the head holder 22, is constantly subjected to 75 forces in the direction of contacting the platen 27 due to the elastic force of the spring 23.

On the other hand 1. The carriage 2o is fixed in the middle of an endless wire 31 stretched between a pulley 3o fixed to the output shaft 29 of the drive motor and a driven pulley (not shown), and the carriage 2o Along with this, it is reciprocated left and right along the platen 27, and printing is performed.

-f7 of guide rule 21:! (A gear 32 is fixed to i, and this gear 32 meshes with a clutch gear 33. The gear 33 is fixed to one end of a shaft 34, and a paper feed roller 35 is fixed to this shaft 34. and
Pinch rollers 36 are pressed against these paper feed rollers 35 . Then, the paper feed reroller 35 and the pinch roller 3
6, the recording paper 37 is guided through the print head 2.
4 and the platen 27. clutch gear 3
3 is configured to transmit rotation to the shaft 34 only in the paper feeding direction.

Next, the operation of the printing device □ according to the present invention, which is configured as described above, will be explained.

First, when printing is performed, the carriage 2o is in the Baum position, as shown in FIGS. 3(a) and 3(b), and at this time the protrusion 25 is in a state separated from the engaging portion 28. Therefore, the print head 24 is in pressure contact with the platen 27 via the recording paper 37 due to the elastic force of the spring 23.

When the drive motor 29 is rotated in this state and the wire 31 is run, the gear ridge 2o moves in the direction shown by the arrow in FIG. 3(a) along the guide rail 21, and the print head follows the print command. The ripening element r- provided at 24 generates heat, and the intended printing is performed.

When one line of printing is completed in this manner and the carriage 20 approaches the vicinity of the other pane of the recording paper 37, a carriage return is performed and the carriage 20 returns to the home position. During this return operation, the carriage 20 returns to a position further leftward from the printing start position, ie, the printing start position. At this time, Fig. 4(a)
, L), the protrusion 25 engages with the engaging portion 28,
In order to ride on the cam surface, the print head 24 is pushed down to the carriage 20 while compressing the spring 23 together with the head holder 22. As a result, the print head 24 and the recording paper 37 are separated.

On the other hand, as the head holder 22 rotates, the guide rail 21 is rotated in the middle skin opening direction as shown in FIG. 4(b). When the guide rail 21 is rotated, the gear 32 is rotated, the shaft 34 is rotated via the clutch gear 33, and the paper feed roller 35 is rotated.
rotates in the direction in which the recording paper 37 is fed. For this reason, recording paper 3
7 is advanced by one line and enters the state of waiting for the next printing.

In order to resume printing, the carriage 20 is first returned to the printing starting position, the protrusion 25 and the engaging portion 28 are disengaged, and the print head 24 is brought into pressure contact with the recording paper 37.

In this way, one drive motor can move the print head, separate the print head from the recording paper, and feed the paper.

Therefore, the number of parts is extremely reduced, the occupied space is reduced, and a compact and inexpensive printing device can be obtained.

In addition, in the above embodiment, the protrusion 25 and the engaging portion 2
8 shows an example in which the protrusions are provided on the left side in the figure, but of course they may be provided on the right side, and furthermore, the projections and engaging portions may be provided on both sides of the head boulder and the platen holder.

When protrusions and engaging parts are provided on both sides, when the gear ridge reaches both sides of the recording paper, the paper feed and separation of the head from the recording paper are performed as described in L, respectively, and printing during the reciprocating movement of the carriage is performed. It becomes possible. If such a structure is adopted, the printing speed can be improved without requiring the extra operation of carriage return, which does not perform printing.

As is clear from the above description, according to the present invention, a print holder with a print head mounted on a carriage that is moved back and forth by a drive motor is slidably attached to the kite rail together with the carriage, and the head halter spring is used to constantly hold the print holder. Preparing the force in the direction of movement toward the platen, a protrusion is provided on the head bolter's The printer is rotated away from the platen and this rotation is used for paper feeding operation.) Since it adopts the '+I'i structure, two drive motors are used to move the print head and move the print head away from the recording paper. Separation and paper feeding can be performed. For this reason, it is possible to dramatically reduce the number of items by 1 degree, reduce the occupied space, and make it possible to use an already inexpensive printing device.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of conventional 4'rl'i construction;
Figures 4(a) and 4(b) illustrate one embodiment of the present invention; Figure 2 is a perspective view, and Figures 3(a) and 3(b).
) is an enlarged plan view of the main part during printing operation and In11 side view,
FIGS. 4(a) and 4(a) are an enlarged plan view and side view of the main part during the paper feeding operation. 20 = ° Gear ridge 21...Kite rail 22...Head boulder 23...Spring 24...
Print head 25... Protrusion 26... Platen holder 28... Holding part 29... Motor
31...Wire 32...Gear 3
3... Clutch gear 34...
35...Paper feed roller 36...Pinch roller 3
7...Recording paper Figure 1 39 Figure 3 (a) (b) 7 Figure 4 (a) (b)

Claims (1)

[Claims] In a printing device that prints by moving the print head while keeping it in pressure contact with the recording paper, a guide rail is rotatably supported on a shaft to guide the print head, and this guide rail is constantly forced to rotate in the direction of the platen. A head holder is provided, the print head is taken out from the head boulder, and a retaining part is provided at least one end of the platen holder to engage with a protrusion protruding from the side edge of the head boulder, and the head boulder is rotated. A printing device characterized in that the motion is transmitted to the paper feed [1-ra] via a clutch gear.