JPH0948136A - Recording head unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink bag which is not limited in the number of times for replenish by a method wherein the ink bag is so constructed that ink can be replenished thereto, and an ink replenishment pipe passes therethrough, in a watertight manner, without reverse flow of ink. SOLUTION: A supply tube 14 arranged at an end of an ink bag 11 and an ink replenishment pipe 1 are fixed, in a watertight manner, to the ink bag 11 with a welded part 11a of the ink bag 11. An ink hole 1b is provided onto a side surface near a left end of a conduit pipe 11a the left end of which does not pass through, and an elastic rubber pipe 1d is so fitted as to cover the ink hole. A tapered part 1c and a funnel shape for outflow of ink can be also formed to the ink hole 1b. Ink is replenished with an injector containing ink from the ink replenishment pipe 1 welded to the ink bag 11. When replenishment is ended, since the ink bag is soft, ink pressure is equal to the atmospheric pressure, and the ink dose not flow out from the watertight pipe. Therefore, a recording head integrated with the ink bag can be used without being disused, and articles of consumption in use become only the ink.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to ink replenishment in a soft ink bag of an instrument capable of recording with an ink jet type or bubble type recording head.

[0002]

2. Description of the Related Art Since a recording portion such as an ink jet recording head according to the present invention is non-contact, there are few failures and the market is growing rapidly. FIG. 4 shows the recording head 13 and the ink bag 11.
4A is an external view of each of the four inkjet recording head units, FIG. 7A is a side view, and FIG. A holder 12, which is connected to a recording head 13 having a piezoelectric element and an ink flow path, is watertightly coupled to a supply tube 14, and the other end of the supply tube 14 is near a lower portion inside a soft ink bag 11 containing ink. The supply tube 14 is watertightly welded to the end of the ink bag 11 above the ink bag 11.
When viewed from the back, it is organized as shown in (b). In this state, when the ink is filled from the ink bag 11 through the supply tube 14 and the holder 12 to the recording head 13, the ink can be ejected by the movement of the piezoelectric element, and when the ink is reduced, the width of the flat portion of the ink bag 11 is (b). From the top, it becomes thinner from the top.

Further, an ink replenishing tube (not shown) is welded to the ink bag 11 of FIG. 4 by a unit different from that of FIG. 4 and the end portion thereof is welded, and when replenishing the ink, the end of the replenishing tube is cut and replenished again. The thing which welds the edge was also put into practical use.

[0004]

In one example described in the prior art, the ink bag has a structure in which ink cannot be replenished. Therefore, when ink cannot be supplied to the recording head, the unit is discarded and a usable unit is used. I was wearing it. Further, in another example, when the ink cannot be supplied, the end of the replenishment tube is cut and used, so that the replenishment frequency is limited.

An object of the present invention is to provide an ink bag having an unlimited number of ink replenishments.

[0006]

SUMMARY OF THE INVENTION According to the present invention, in a recording head unit in which a holder with a recording head and a soft ink bag are connected in a watertight manner by a supply tube, an ink supply tube that can refill the ink bag and does not flow backward is watertight. It is a structure that is penetrated. Further, according to the present invention, in the recording head unit according to claim 1, the ink replenishing pipe is composed of a conduit having an ink hole on a side surface near an end which does not penetrate and an elastic watertight pipe covering the ink hole. The central portion is welded at the end of the ink bag.

[0007]

According to the present invention, the ink supply pipe that can be replenished and does not flow backward is watertightly welded to the ink bag and penetrates the ink flow path of the ink supply pipe. Therefore, the ink supply pipe is a non-consumable product, There is no limit to the number of refills. Further, according to the present invention, since the ink replenishing pipe covers the ink hole on the side surface of the conduit with the elastic watertight pipe, when replenishing the ink, the ink is put into the ink bag through the watertight pipe from the ink hole and the replenishment is performed. At the end, the ink bag is soft and the ink pressure and atmospheric pressure are the same, so that the ink does not flow out from the watertight tube to the ink hole.

[0008]

FIG. 1 shows an embodiment of the present invention. Ink bag 1
Supply tube 14 and ink replenishment tube 1 arranged at one end
Is watertightly fixed at the welded portion 11a of the ink bag 11. FIG. 2 is a view showing an example of the structure of the ink supply pipe 1, in which an ink hole 1b is provided on the side surface near the left end of the conduit 1a whose left end does not penetrate, and an elastic rubber pipe 1d is fitted so as to cover the ink hole. It is also possible to form a taper portion 1c for ink outflow or a funnel shape on the right side of the drawing in the ink hole 1b.

FIG. 3 is a diagram showing a specific example of ink replenishment, and shows a stage just before ink is replenished by an ink-filled syringe 9 from an ink replenishment tube 1 welded to an ink bag 11.

[0010]

According to the present invention, since there is no limit to refilling the ink bag, it is possible to use the recording head integrated with the ink bag without discarding it, so that industrial waste is reduced, and consumables in use. Is only ink and maintenance costs are low,
Further, as for the ink bag with the refill tube, the ink bag can be enlarged up to the space occupied by the refill tube, so that it is possible to provide the recording head unit in which the usage period from one refill is longer.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an ink supply pipe according to the present invention.

FIG. 3 is an explanatory diagram of ink supply according to the present invention.

FIG. 4A is a side view and FIG. 4B is a rear view of the structure of the conventional inkjet recording head.

[Explanation of symbols]

 1 Ink Supply Tube 1a Conduit 1b Ink Hole 1d Rubber Tube 9 Syringe 11 Ink Bag 11a Welding Section 13 Recording Head 14 Supply Tube

Claims (2)

[Claims] 1. A recording head unit in which a holder with a recording head and a soft ink bag are watertightly connected by a supply tube, wherein the ink bag has a structure in which an ink supply pipe that can be replenished and does not flow backward is penetrated in a watertight manner. Recording head unit. 2. The recording head unit according to claim 1, wherein the ink supply pipe is composed of a conduit having an ink hole on a side surface near an end which does not penetrate, and an elastic watertight pipe covering the ink hole. A recording head unit having a structure in which the central portion is welded at the end of the ink bag.