JPS6236232A - Sheet feeding device of printer - Google Patents

Abstract

PURPOSE:To suppress the noise leak to outside to a possible minimum, in the case of using an automatic sheet feeder, by furnishing sheet feed/exhaust ports at the bottom of the printer body and in the upper part of the body of automatic sheet feeder. CONSTITUTION:Sheets 33 in a sheet feed cassette 15 are fed by a feed roller 19 to come into the body of printer 16 from feed and exhaust port 18 and 17, and printed by a printing head 24 to be then sent to between a platen 21 and a paper veil roller 22. Each sheet 33 sent off by the rotating platen 21 is put again in an auto sheet feeder 13 from the feed and exhaust ports 17, 18, and collected into the below exhaust cassette and the like of the sheet feed cassette 15 by an exhaust roller 20. To providing winding a sheet 33 round the platen 21 by hand, a sheet insert hole 34 is provided in an upper cover 16a.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device for feeding paper using a separate automatic paper feeding device in a printer.

For printers that emit printing sounds, such as impact printers,
Conventionally, various methods have been taken as noise reduction measures. For example, sound-absorbing material or damping material may be attached to the inside of a printer to prevent vibration noise. Take measures to dampen impact noise,
Alternatively, various countermeasures have been taken, such as changing the rubber material of the platen, using multiple rubber layers to reduce noise, and so on.

However, all of them were half-hearted and could not achieve sufficient noise reduction effects.

In particular, when an automatic paper feeding device (so-called auto sheet feeder, form tractor, etc.) was attached to the printer, the noise was doubled. One of the causes of this is the noise generated by the automatic paper feeder itself, but in order to install it as an accessory to the printer, the opening of the printer body, especially at the top, has increased or become larger, which increases the volume of noise leaking from inside the printer to the outside. This is because it increases.

For example, as shown in FIG. 5, an auto sheet feeder (3) that integrates a hopper (1) and a stacker (2) is used, and this is placed on the printer body (4). There is a platen (5) on the top of the printer body (4).
An opening for a power transmission mechanism from to the auto sheet feeder (3), an opening for paper feeding, an opening for paper ejection, etc. are required.

In addition, as shown in Figure 6, a hopper (6) and a stacker (
7) Using an auto sheet feeder (8) separated from
In the type where the printer body (4) is placed on the hopper (6) and the stacker (7) is attached to the top of the printer body (4), there is an opening at the bottom of the printer body (4) for feeding paper. In addition, an opening for a power transmission mechanism from the platen (5) to the paper ejection roller (9) and an opening for paper ejection are required at the top of the printer body (4). be.

Therefore, conventionally, in the case of the type shown in Fig. 5, the seventh
As shown in the figure, the entire auto sheet feeder (3) was covered with a sound insulating cover (lO) for soundproofing, but this had the disadvantage of poor design and reduced commercial value. Also, for this type.

Generally, the auto sheet feeder (3) is installed diagonally as shown by the solid line or horizontally as shown by the broken line.
) was unstable, and required legs to support it, especially when installed horizontally.

Purpose The purpose of this invention is to reduce noise leaking from inside the printer to the outside when an automatic paper feeder is used.

Another objective is to reduce as much as possible the sound leaking from the inside of the automatic paper feeder to the outside.

Configuration Therefore, in the present invention, a paper feed/discharge port is provided at the bottom of the printer body and at the top of the automatic paper feeder body on which the printer body can be mounted. The automatic paper feeder main body includes a paper feed mechanism that feeds paper to a platen in the printer main body through the paper feed/discharge port, and a paper discharge mechanism that discharges paper from the platen through the paper feed/discharge port. establish.

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

In FIG. 1, an auto sheet feeder (11) is used with a printer (12) mounted thereon.

A paper feed cassette (15) is removably loaded into the auto sheet feeder main body (13) from a front opening/closing cover (14). Upper cover (16a) and lower cover (16b)
A paper feed/discharge port (17) is formed at the bottom of the printer main body (16), that is, at the center of the lower cover (16b).

Further, a paper feed/discharge port (18) matching the paper feed/discharge port (17) is also formed at the top of the auto sheet feeder main body (13).

Inside the auto sheet feeder main body (13), a paper feeding mechanism including a paper feeding roller (19) and a paper ejecting mechanism including a paper ejecting roller (20) are provided, and within the printer main body (16), a platen ( 21), a paper pail roller (22), a pressure roller (23), a print head (24), and other known mechanisms are provided.

Between the top surface of the auto sheet feeder main body (13) and the bottom surface of the printer main body (16), there is a gasket (packet) to close the periphery of the gap space (26) formed by the feet (25) of the printer main body (16). 27) is interposed.

As shown in FIG. 2, the shaft (28) of the platen (21) is pivotally supported by a frame (30) mounted on the lower cover (16b) via a rubber pad (29). An operation knob (31) and a platen knob (32) are attached to this shaft (28) on the outside of the upper cover (16a).

Now, as can be seen from Fig. 1, the paper (33) in the paper feed cassette (15) is fed by the paper feed roller (19), and the paper (33) in the paper feed cassette (15) is fed through the paper feed/discharge ports (18) and (17) into the printer body.
16), is guided by a guide plate (not shown), etc., to the platen (21), and is guided to the print head (21).
4), and then sent between the platen (21) and the paper pail roller (22).

Then, the paper (33) sent out by the rotation of the platen (21) is guided by a guide plate (not shown), etc., and then enters the auto sheet feeder main body (13) again from the paper feed/discharge ports (17) and (18). paper output roller (2)
0), the paper is collected in a paper ejection cassette (not shown) below the paper feed cassette (15).

As shown in FIG. 3, the upper cover (16a) is attached so that the paper (33) can be manually fed and wrapped around the platen (21).
A paper insertion port (34) is provided in the. In this case, as shown in FIG. 4, a slide cover (35) for opening and closing the paper slot (34) is attached to the top cover (16a),
This slide cover (35) has a paper pail lever (
By providing a protrusion (37) that engages with a protrusion (36) (not shown), the paper pail roller (22) can be automatically retracted from the platen (21) when the slide cover (35) is opened. I can do it.

Note that the auto sheet feeder main body (13) and the printer main body (16) are provided with an openable/closable cover that can be removed when the paper (33) is jammed.

effect This invention has the following effects.

■ After feeding the paper to the platen through the paper feed/discharge port on the top of the automatic paper feeder main body and the paper feed/discharge port on the bottom of the printer main body, the paper from the platen is automatically fed again through these paper feed/discharge ports. Since the paper is ejected into the main body of the paper feeder, the number of openings in the upper part of the printer main body is reduced, which greatly improves the noise prevention effect.

■ Since the entire automatic paper feeder is installed on the underside of the printer, there are no problems with conventional top-mounted printers, such as poor design, reduced product value, or poor safety.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment of the present invention, and FIG.
The figure is an enlarged sectional view of a portion thereof, FIGS. 5 and 6 are side views of the conventional example, and FIG. 7 is a sectional view of the one shown in FIG. 5 with a sound insulating cover attached.

Claims (1)

[Claims] 1. A paper feed/discharge port is provided at the bottom of the printer main body and at the top of the automatic paper feeder main body on which the platen main body can be mounted; A printer comprising: a paper feed mechanism that feeds paper to a platen in the printer main body through a paper feed/discharge port; and a paper discharge mechanism that discharges paper from the platen through the paper feed/discharge port. paper feeder. 2. A gap space is formed between the main body of the printer and the main body of the automatic paper feeder, with the respective paper feed/discharge ports facing each other, and the periphery of the gap space is closed with packing. The paper feeder of the listed printer.