JPS6280074A - impact recording 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 [Technical Field] The present invention relates to an impact recording device for recording by striking the surface of a sheet, such as a wire dot printer.

[Prior art]

2. Description of the Related Art Recording devices such as printers and facsimiles that form prints using a dot matrix include non-impact types such as thermal types and inkjet types, as well as impact types such as wire dot types.

In addition, these recording devices include line printers that record one line at the same time and page printers that record one page at the same time. Serial recording devices that record while moving the head are widely used.

The present invention is directed to serial type and impact type recording devices among the above types of recording devices.
A typical example is a serial wire dot printer.

This type of impact recording device is relatively noisy, and the sources of noise are vibration noise inside the recording head, vibration of the sheet, and vibrations of other parts. It is ordered at the time of impact, and the percentage of tightening during noise is relatively large.

FIG. 1 shows an example of a conventional impact recording device.

In FIG. 1, an impact-type recording head 1 such as a wire dot head faces a platen 2 and is driven reciprocally in a direction perpendicular to the general feeding direction (parallel to the axis of the platen 2). .

A pail roller 3 that can be pressed and separated is provided on the exit side of the recording section (the part facing the recording head 1) of the platen 2.
On the other hand, a pin feed tractor 4 is provided on the sheet supply side. Further, a sheet guide 5 that forms a sheet passage is installed on the peripheral surface of the platen 2 (in the illustrated example, on the lower side).

A continuous sheet 6 having a feed hole, such as fan-hold paper, is
It is fed by the bin feed tractor 4 and pressed against the circumferential surface of the platen 2 by the pail roller 3.

However, in the conventional impact recording apparatus shown in FIG. 1, although the exit side of the sheet 6 is held down by the hail roller 3, when the sheet 6 is impacted by the recording head 1, the sheet 6 is The sheet 6 easily lifts up from the platen 2, which causes a problem in that the vibration of the sheet 6 due to the impact becomes relatively large and the noise becomes large.

In particular, when a continuous sheet 6 is used, the seams (perforations, etc.) 7 of the sheet rise up from the platen 2 as shown in the figure, so there is a problem in that when recording the seams, the vibrations become even louder and the noise becomes louder. . This noise increases as the sheet 6 becomes thicker (there is an intermediate level).

〔the purpose〕

An object of the present invention is to solve the problems of the prior art, and to effectively reduce or eliminate sheet vibration even when impacting the seam of continuous sheets, thereby effectively reducing noise. The object of the present invention is to provide a highly effective impact recording device.

〔overview〕

The present invention achieves the above object by providing a sheet pressing roller that moves together with the recording head in the vicinity of the recording head.

In the above configuration, if at least a portion (for example, the surface portion) of the sheet holding roller is made of a vibration-proofing material made of a rubber-like elastic material, even minute vibrations of the sheet can be absorbed, further reducing noise. can be achieved.

〔Example〕

The present invention will be specifically described below with reference to the drawings.

FIG. 2 shows a plan view of a main part of an impact recording device according to an embodiment of the present invention, and FIGS. 3 and 4 show side views of FIG. 2.

In FIGS. 2 to 4, the recording head 1 faces the platen 2 and is driven back and forth in a direction perpendicular to the conveying direction of the sheet 6 (in the direction of arrow A) along a guide means such as a guide shaft (not shown). During this time, recording is performed on the sheet 6 while driving a plurality of dot forming elements (wires, etc.) based on the print data signal (for example, ejecting and driving the wires by electromagnetic force). For wire dot type, ink ribbon (not shown)
Transfer recording is performed by impacting the sheet 6 through the.

However, near the recording head 1, that is, on both sides of the recording head in the illustrated example, rollers 8, 8 for holding down the sheet 6, which are pressed against the platen 2, are provided.

Each of the rollers 8, 8 is rotatably supported by arms 9, 9 extending from both sides of the recording head 1 around an axis in the vertical direction, and is positioned at a height substantially aligned in the height direction of the recording head 1. It is located. Note that the rollers 8, 8 can be made of any suitable material such as plastic, but the sheet 6
From the viewpoint of reducing vibration, it is preferable to use a vibration-proofing material such as a rubber-like elastic material.

A pail roller 3 is provided on the surface of the platen 2 on the exit side from the recording section so as to be able to press against and separate from the surface.

In FIGS. 3 and 4, the arm 9°9 has an oval shape, is attached to be swingable about the fulcrum 10 of one example of the recording head, and is equipped with a spring (pressure contact spring).
11, the roller 8.degree. 8 is urged to come into pressure contact with the platen 2.

Further, a solenoid 12 is provided on the recording head 1 side for swinging the arm 9.9 in the opposite direction (clockwise in the figure) against the spring 11 to separate the rollers 8, 8 from the platen. It is being

The operation is as follows.

When recording, the solenoid 12 is turned off and the rollers 8 are brought into pressure contact with the sheet 6 by the spring 11, as shown in FIG. In this case, the pail roller 3 is also connected to the platen 2.
is pressed against.

When the sheet 6 is fed (conveyed) after recording one line and the next line is to be recorded, the solenoid 12 is turned on and the rollers 8, 8 are separated from the sheet 6 (
up).

Note that when inserting or removing the sheet 6, both the roller 8.8 and the pail roller 3 are separated from the platen 2.

According to the embodiment described above, since the sheet 6 is always pressed against the platen 2 during recording (impact) by the rollers 8, 8 provided on both sides of the recording head 1, the continuous sheet (
Even if there is a part that would lift up from the platen 2 in the past, such as a seam (folded part such as a perforation) of fan-holed paper, etc., this lifting can be reliably prevented.

Therefore, vibration of the sheet 6 due to impact can be reduced or eliminated, and noise during recording can be reduced.

Furthermore, if the rollers 8.8 are made of a vibration-proofing material such as a rubber-like elastic material, even minute vibrations of the sheet 6 can be absorbed, and the noise reduction effect can be further improved.

5 and 6 show side views corresponding to FIGS. 3 and 4 of an impact recording device according to another embodiment of the present invention.

This embodiment uses a morph-driven cam 13 in place of the solenoid 12 in FIGS. 3 and 4 to
The other parts have substantially the same structure. Therefore, corresponding parts will be designated by the same reference numerals, and detailed description thereof will be omitted.

The embodiments shown in FIGS. 5 and 6 can also provide the same effects as those described above.

FIGS. 7 and 8 are plan views of essential parts of an impact recording device according to still another embodiment of the present invention.

In this embodiment, an arm 15, 15 is provided on the side of the recording head 1 that slides forward and backward relative to the platen 2 along the 14° 14, and rollers 8, 8 are pivotally supported at the tip of the arm. ing. This arm 15.15 has a spring (
The rollers 8, 8 are always urged to be in pressure contact with the platen 2 by a pressure contact spring 16.

Further, the rollers 8,
As shown in FIG.
is provided.

Therefore, during recording (impact), the rollers 8, 8 are pressed against the platen 2 on both sides of the recording head 1 as shown in FIG. 7, and the sheet 6 between them is pressed against the platen. to the end of the platen 2, and as shown in FIG.
This causes each roller 8, 8 to move away from the platen 2 (roller up) against the spring 16.

The embodiment of FIGS. 7 and 8 is based on the roller 8.8.
The up-down mechanism is different from each of the above-mentioned embodiments,
The other parts have substantially the same structure, and accordingly, corresponding parts are designated by the same reference numerals and detailed description thereof will be omitted.

According to this embodiment, in addition to obtaining the same effects as those of the above-described embodiments, the rollers 8, 8 can be moved away (up) without providing a special drive source such as a solenoid 12 or a cam 13 drive motor. This has the effect of reducing costs.

In each of the illustrated embodiments, the rollers 8, 8 for holding the sheet are
are provided on both sides of the recording head 1, but it is also possible to provide them only on either side of the recording head.

Furthermore, the present invention can be applied not only to the case of recording on a continuous sheet with perforations conveyed by a bin feed tractor or pin feed wheel, but also to the case of recording on cut sheets.

Further, the present invention can be applied to various types of recording apparatuses that record by impact, such as wire dot printers and hammer set printers (or typewriters).

〔effect〕

As is clear from the above description, the present invention provides an impact recording device that can reduce noise by reducing the vibration of the sheet at the time of impact.

[Brief explanation of drawings]

FIG. 1 is a schematic side view illustrating a conventional impact recording device, FIG. 2 is a schematic plan view of an embodiment of the impact recording device according to the present invention, and FIGS. 3 and 4 are side views of FIG. 2. 5 and 6 are side views of other embodiments of the present invention, and FIGS. 7 and 8 are schematic plan views of essential parts of still further embodiments of the present invention. 1-------Record head, 2-----Platen,
6----- Sheet, 8----- Roller for holding the sheet down, A. --- 1-- Recording head can be moved. Agent Patent Attorney Yasushi Ooto Figure 2

Claims (2)

[Claims] (1) An impact recording apparatus that performs recording while moving a recording head in a direction perpendicular to the conveying direction of a sheet, characterized in that a roller for holding down the sheet is provided near the recording head. (2) The impact recording device according to claim 1, wherein at least a portion of the roller is formed of a rubber-like elastic material.