JPS6344063B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink jet printing device.

Conventionally, in inkjet printing devices,
In order to test the operation of the print head before starting printing, ink is jetted toward a roller located at a distance from the platen. Therefore, the ink adhering to the roller surface must be wiped off, but although this is done using a sponge or other pad, it quickly becomes dirty and must be replaced frequently.

The present invention has been made in view of these points, and an object of the present invention is to provide an inkjet type printing device equipped with a wiping mechanism capable of wiping off jetted ink over a long period of time.

In the present invention, the under-wiping part and the finishing part are installed insulated from each other on the roller that receives the ink, so if the capacity of the under-wiping part is large, the roller surface will be covered for a very long time. It is designed to clean the roller surface well, eliminating the need to replace pads over a long period of time, and in particular to ensure that ink jetting tests can be performed with good cleaning of the roller surface. It is.

An embodiment of the present invention will be described based on the drawings.
First, the overall schematic diagram will be explained based on FIG. 1. A cylindrical platen 2 having a gripping portion 1 at one end is provided on a frame or a support plate (not shown), and a paper pressing roller 4 for pressing the recording paper 3 wound around the platen 2 is provided. Two guide shafts 5 and 6 are provided parallel to such platen 2. Of these guide shafts 5 and 6, the guide shaft 5 on the platen 2 side is fixedly attached to opposing frames 7 and 8. Further, the frame 8 side of the guide shaft 6 is positioned by a steel ball 10 positioned by an intermittent ring 9, and an elastic clip 11 is positioned.
It is mounted so that it can rotate around a single point. Further, an eccentric bearing 12 is attached to the frame 7 side, a shaft hole 13 having a diameter slightly larger than the guide shaft 6 is formed in the eccentric bearing 12, and the shaft hole 13 is rotatably supported by a steel ball 14. Such an eccentric bearing 12 is rotatably attached to the frame 8, and the shaft hole 13 is eccentric with respect to the center of rotation. Further, a passive gear 15 is integrally attached to the eccentric shaft 12, and a worm 17 connected to a motor 16 is meshed with the passive gear 15. Furthermore, a stopper plate 18 serving as a locking body is attached to the eccentric bearing 12,
This stopper plate 18 has a small diameter portion 19 and a large diameter portion 20.
It becomes more. Further, a plurality of engagement holes 21 are formed on the circumference of the eccentric bearing 12. A cam 22 is attached to the eccentric bearing 12, and a pin 23 that selectively engages with the engagement hole 21 is fixed to the cam 22, and its position in the rotation direction is adjusted. It is being A switch 24 for controlling the operation of the motor 16 is detachably provided on the cam 22.

Therefore, the guide shafts 5 and 6 are provided with a carrier 2.
5 is movably provided. This carrier 2
Reference numeral 5 indicates a circular fitting in which the axis does not move with respect to the guide shaft 5, and a fitting with a notch 26 which is movable in the horizontal direction to the other guide shaft 6.
An inkjet printing head 27 is fixed to the carrier 25, and the printing head 27 is provided with a nozzle surface 28 facing the platen 2 with a predetermined dimension.

Next, a frame 2 is installed on one side of the platen 2.
9, and a cap roller 30, which is located on a coaxial extension of the platen 2 and has a slightly larger diameter and is elastic, is rotatably attached to the frame 29. A gear 31 is integrally formed on this roller 30, and a motor 32 fixed to the frame 29 is attached to this gear 31.
A worm 33 connected to the worm 33 is engaged with the worm 33 .

The carrier 25 also has the nozzle surface 28.
is aligned with the stopper plate 18 while facing the roller 30, and the stopper plate 1 is aligned with the stopper plate 18.
Notch portion 3 serving as an engaging portion that fits into the large diameter portion 20 of No. 8
4 is formed. Further, 35 engages with the carrier 25 to form a nozzle surface 28 of the print head 27.
This is a switch that detects that the roller 30 is facing the roller 30.

A frame 36 is provided between the platen 2 and the roller 30. The upper edge 37 of the frame 36 is provided with two locking protrusions 38 projecting upward and a locking hole 39 formed between the two locking protrusions 38. A larger rectangular opening 40 is formed below the locking hole 39.

A wiping unit 41 is installed in such a frame 36.
is attached removably. This wiping unit 41 consists of a case 42 and a pad holder 43. The case 42 consists of a case A44 to which the part holder 43 is attached, and a case B45 that is adhesively fixed to the case A44 and engaged with the frame 36. This case B45 includes a holding hole 46 that fits into the locking protrusion 38, and a holding hole 46 that fits into the locking hole 3.
9 and the aperture 40.
An engaging protrusion 48 that is inserted into the frame 36 to prevent separation from the frame 36 is formed. Further, the case A44 has side edges 49 at the upper and lower sides, and is open at the front and rear. and,
The upper side edge 49 has a knob 50 that projects upward.
is formed, and a stopper 51 is provided inside the lower side edge 49. In addition, the case A
A support shaft 52 is installed horizontally below 44,
An arm 53 is rotatably attached to this support shaft 52, and this arm 53 is biased in one direction by a spring 53a. The pad holder 43 is rotatably attached to the tip of the arm 53. This pad holder 43 has a storage chamber 55 which has a relatively large capacity and accommodates a bottom wiping pad 54.
A partition wall 58 separates the finishing pad 56 from a storage chamber 57 having a relatively small volume. Legs 59 are formed at the bottom to abut against the stopper 51, and the partition wall 58 is joined to the roller 30. Therefore, this partition wall 58 also has a function as a scraping claw. Note that 60 is a protrusion that holds the bottom wiping pad 54, and 61 is a protrusion that holds the finishing pad 56.

In this configuration, in a normal printing state, the print head 27 reciprocates within a short range facing the platen 2, thereby recording on the recording paper 3 under ink jet control. However,
When an operation button or the like for this purpose is pressed at the end of printing, the carrier 25 advances to the leftmost end, and the switch 35 is pressed to stop the carrier 25 from moving to the left.
When the switch 35 operates in this way, the motor 16 starts, and the eccentric bearing 12 starts rotating via the worm 17 and the passive gear 15.
As a result, the large diameter portion 20 of the stopper plate 18 fits into the notch 34 of the carrier 25, and the carrier 2
Locks the axial movement of 5. As the rotation of the eccentric bearing 12 progresses, as the rotation of the eccentric bearing 12 progresses, the
Migrate as shown in the figure. That is, carrier 2
5 rotates around the guide shaft 5, and the nozzle surface 28 comes into contact with the roller 30, so that an opening (not shown) of the nozzle surface 28 is closed. Then, the cam 22 is activated by the switch 24 at a position where this pressure contact state is most appropriate.
is operated, the operation of the motor 16 is stopped, and the entire system is brought to a standstill. Even if there is a long pause in this state, the nozzle surface 28 will not dry out, and the inkjet will be ejected very normally during reuse. In addition, at the time of starting, the motor 16 rotates in reverse,
The position is determined by turning the switch 24 ON and OFF by the cam 22, and when this position is determined, the distance between the nozzle surface 28 and the platen 2 is maintained constant.

Moreover, it goes without saying that the eccentric bearing 12 may be provided not only on one side but also on both sides so as to rotate simultaneously.

The relative relationship between the eccentric bearing 12, the stopper plate 18, and the cam 22 can be changed by appropriately selecting the position of the pin 23 with respect to the engagement hole 21 and changing the relative position of the cam 22.

At the start of printing, ink is ejected with the nozzle surface 28 of the print head 27 separated from the roller 30, as shown in FIG. At this time, the motor 32 is driven to rotate the roller 30, but this ink jetting creates a state in which the flying state of ink droplets is stabilized, resulting in a normal printing state as described above. At this time, the ink adhering to the surface of the roller 30 is wiped off by the lower wiping pad 54, and the partition wall 58 acts as a scraping claw, causing the lower wiping pad 54 to absorb most of the ink. Then, the slight amount left behind is wiped off with a finishing pad 56. At this time,
If the absorption capacity of the lower wiping pad 54 is high, the roller 30 can be cleaned for a long period of time. When replacing the bottom wiping pad 54 and the finishing pad 56, the pad holder 43 is
This can be done by rotating the roller 30 to the opposite side. Of course, the wiping unit 41 may be removed from the frame 36 for this purpose.

In the present invention, as described above, ink is ejected from the printing head to the roller provided on the side of the platen, and the bottom wiping pad and the finishing pad are installed in a state where they are insulated from each other. Ink can be wiped off over a long period of time.In particular, if the capacity of the bottom wiping pad is increased, replacement over a long period of time can be eliminated. If the partition wall is joined to a roller to form a scraping claw, even more effective cleaning can be achieved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is an exploded perspective view, FIG. 2 is a plan view, FIG. 3 is a vertical cross-sectional side view of a portion during printing, and FIG. 4 is a vertical cross-sectional view during rest. A side view, Fig. 5 is an enlarged sectional view of the guide shaft in its supported state, Fig. 6 is a side view showing the steel ball in its supported state, Fig. 7 is a side view of the area around the eccentric bearing, and Fig. 8 is its passive gear. and a side view showing the relationship between the motor and the motor.
Figure 9 is a side view showing the relationship between the cam and the switch;
FIG. 10 is a side view showing the relationship between the stopper plate and the carrier, FIG. 11 is a plan view showing the relationship between the carrier and the switch, FIG. 12 is a side view showing the relationship between the roller and the wiping unit, and FIG. The figure is an exploded perspective view of the wiping unit, FIG. 14 is a perspective view of the frame,
FIG. 15 is a perspective view showing the state in which the wiping unit is attached. 2... Platen, 3... Recording paper, 27... Printing head, 30... Roller, 54... Bottom wiping pad, 56... Finishing pad, 58... Partition wall.

Claims (1)

[Scope of Claims] 1. A roller that receives ink from a print head is rotatably provided on the side of a platen around which recording paper is wound, and a bottom wiping pad that has ink absorbency is brought into contact with the outer periphery of this roller. A finishing pad is provided, which is located on the rear side of the bottom wiping pad in the direction of rotation of the roller and comes into contact with the outer periphery of the roller,
An inkjet type printing device characterized by being provided with a pad holder having a partition wall that separates and holds these finishing pads and the bottom wiping pad. 2. A rotatable roller is provided on the side of the platen around which the recording paper is wound to receive ink from the print head, and a bottom wiping pad with ink absorbency is provided in contact with the outer periphery of this roller. A finishing part is provided on the rear side of the finishing part in the rotational direction of the roller and comes into contact with the outer periphery of the roller,
A pad holder having a partition wall that separates and holds these finishing pads and the bottom wiping pad is provided, and the partition wall is located between the finishing pad and the bottom wiping pad of this pad holder. An inkjet type printing device characterized in that an ink scraping claw is formed by joining the roller to the roller.