JPH02509A - Ink jet recorder - Google Patents

Abstract

PURPOSE:To prevent the surface of a recording sheet from contaminating with ink at the time of insertion of the sheet by providing a recording sheet floating preventive protrusion protruding toward a platen at the downstream side of a recording sheet conveying direction on a moving member for recording. CONSTITUTION:A protrusion 10 protruding toward a platen 1 for preventing a recording sheet from floating is provided at the downstream side of a recording sheet feeding direction of a nozzle face 9 provided oppositely to the sheet on an ink jet head 8, and a distance between the end of the protrusion 10 and the platen 1 is substantially equal to or shorter than a distance between the nozzle face 9 of the head 8 and the platen 1. Thus, since the sheet 2 is brought into contact with the protrusion 10 thereby to avoid the contact with the nozzle face 9, it can prevent the surface of the sheet from contaminating. It is preferable to so form the head 8 in a smooth shape from the face 9 to the protrusion 10 as to smoothly ride the end of the sheet on the protrusion 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inkjet recording device, and more particularly to prevention of stains caused by ink when recording paper is inserted into the device.

Inkjet recording devices that perform recording by ejecting ink droplets from the nozzles of an inkjet head are attracting attention because of their features such as non-impact type, plain paper recording, high speed recording, and simple configuration. FIG. 1 is a schematic diagram of an example of an inkjet recording apparatus, which is a serial type recording apparatus in which a recording paper 2 is mounted on a platen 1, and a head 3 faces the recording paper 2 and records one line at a time. As shown in FIG. 2, the arrangement of this apparatus when viewed from the side, the recording paper 2 is mounted in close contact with the platen l by a paper presser roller 4, a paper guide 5, etc., and the recording paper facing surface 6 has the nozzles of the head 3. and maintaining appropriate spacing. If the recording paper is properly loaded in this manner, the device will operate in this state, but there is a risk of stains when the recording paper is inserted for the first time. This is because, as shown in FIG. 3, when the recording paper 2 is inserted from the insertion lower of the paper guide 5, the leading edge of the paper comes into contact with the recording paper facing surface 6 of the head 3.
This surface 6 is often wetted by ink as it is the surface where the nozzle is located, and therefore this contact area becomes dirty.If the paper pressure roller 4 is attached, the state shown in Fig. 2 will occur, so there will be no problem after that. Since the paper pressing roller 4 is removed from the platen 1 during the first insertion, the recording paper 2 comes into contact with the floating head 3 at the head 3 portion of the platen 1. To avoid this, it is possible to move the head 3 to the edge and be careful when inserting it, or to insert the recording paper in a position outside the head 3, but it is necessary to force the user to do this. The reason is that the product value is reduced because it is difficult to handle. The present invention eliminates these drawbacks and achieves prevention of dirt when inserting recording paper with a very simple structure, and will be described in detail below based on examples. FIG. 4 shows an embodiment of the present invention, and an improved inkjet head 8 is characterized in that a protrusion 10 is provided on the recording paper feeding direction side of the nozzle surface 9 provided on the surface facing the recording paper. As a result, as shown in the figure, the recording paper 2 comes into contact with the protrusion 10 and is prevented from coming into contact with the nozzle surface 9, so that staining of the paper surface can be prevented. However, the outlet part 11 of the paper guide 5 is provided at the very edge of the head 3, but after the leading edge of the recording paper 2 is inserted out of this outlet part 11, the leading edge of the paper guide 5 comes into contact with the nozzle surface 9. However, in this case, only the leading edge of the paper, ie, the side surface of the leading edge of the paper, is slightly stained, and the surface is not stained as in the conventional case, so there is no problem at all in practice. However, it is preferable that the head 3 has a smooth shape so that the leading edge of the recording paper can smoothly ride on the protrusion 10 from the nozzle surface 9 to the protrusion 10.

The protruding portion 10 of the head 3 can be formed as a head body in this way, but the head is attached to a device, such as a carriage on which the head is mounted and moved, or a head holder that is fixed and held on the head carriage. It is easily understood that it can also be formed from a member. In other words, it is possible to form an inkjet head or the above-mentioned head into a recording moving member consisting of a mounting member for mounting it on a recording device to prevent stains when recording paper is inserted. realizable.

Although the above-mentioned embodiment is applied to a so-called serial printer, the present invention is not limited to a recording device having such a configuration. For example, as shown in FIG. 13 are arranged and record while reciprocatingly vibrating as shown by the arrow 14 by the pitch interval of these discs 13, the surface facing the recording paper of these discs 13 is exactly the same as that shown in Fig. 4. By configuring such a protrusion, it is possible to prevent recording dirt, and the present invention is not limited to the mechanisms of general recording apparatuses, such as the mechanism and shape of the platen, and the feeding mechanism of the head.

FIG. 1 is a schematic diagram showing an example of a conventional inkjet serial printer. Figures 2 and 3 are side views, and Figure 4
The figure is a side view of an embodiment of the present invention applied to the printer of FIG. 1, and FIG. 5 is a schematic diagram of the configuration of another printer to which the present invention can be applied.

1 12・・・・・・Platen 2・・・・・・・・・・・・・・・Recording paper 3.8
．． 13... Inkjet head 9...
・・・・・・・・・Nozzle surface 10・・・・・・・・・
・・・・・・Prominent section or above Applicant Seiko Epson Co., Ltd. agent Patent attorney Kizobe Suzuki and one other person

[Brief explanation of the drawing]

Broom 3 Figure 4 Figure 2 Figure 5 Procedural amendment (spontaneous) Procedural amendment

Claims (1)

[Scope of Claims] A cylindrical platen, a nozzle surface in which a nozzle for ejecting ink droplets is formed on a surface facing the platen, and a recording paper is disposed between the platen and the platen. In an inkjet recording apparatus, the inkjet recording apparatus includes an inkjet head that is arranged to face the platen at regular intervals and performs recording by moving in the longitudinal direction of the platen, and a recording moving member that is a mounting member that mounts the head on the recording apparatus, The recording moving member is located downstream in the conveying direction of the recording paper from the nozzle surface of the recording paper that is sent out in the direction of the nozzle surface of the inkjet head along the circumferential direction of the platen that intersects with the moving direction of the inkjet head. A protrusion for preventing the recording paper from lifting up is provided that protrudes toward the platen, and the distance between the tip of the protrusion and the platen is equal to the distance between the nozzle surface of the head and the platen. An inkjet recording device characterized in that the inkjet recording device is substantially equal to or smaller than that of the inkjet recording device.