JPS60165274A - Paper feeding mechanism - Google Patents

Abstract

PURPOSE:To achieve a reduction in the cost with a simple construction of an automatic paper feeder by setting manually feeding paper on a printer except for automatically feeding paper with the automatic paper feeder on the body of the printer to eliminate the loading and unloading of an automatic paper feeder with respect to the printer. CONSTITUTION:When a paper 20a set on a platen 27 is line fed backward during the printing, the paper 20a pulled out to the platen 27 is returned with a pressure roller 28 into a paper feed path 26 and can be deflected and housed into a pocket 25 as illustrated through the rear end thereof remains near the outlet of a feed roller 22. This allows the retraction accurately without trouble despite a considerable space for the backward linefeed. When another paper is fed into a printer D manually, the paper 38 can be fed easily with an ordinary means into a paper feed port 40 of a deflector 39 provided along the platen 27.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a paper feeding mechanism used in a printing device such as a printer.

! Kome Niba I Conventionally, there is an automatic paper feeder used in a printing device as shown in FIG. 1, for example.

In the figure, to explain an example of this automatic paper feeding device, the reference numeral (1) indicates a paper feeding hopper, and within this hopper, sheets (cut sheets) (2) are stacked and stocked. A feed roller (3) is provided opposite to the paper at a position in contact with the lower upper surface of the paper. (4) shows a friction pad that is in contact with the feed roller (3), and when the feed roller (3) rotates clockwise in the figure, the friction pad will move when the top sheet of the stocked paper (2) is pressed. It is pushed out toward the platen (5) while being pushed.

The paper (2) fed out in the above manner is placed on the platen (5).
) is fed out downward to the contact position with the pressure roller (6), and is fed out excessively to give the paper a bulge (α), and the feed roller (3) stops rotating.

Next, the platen (5) is rotated by a predetermined amount in the clockwise direction shown in the figure, the paper is pulled out along the platen to a predetermined position, and the paper is set on the platen. At this time, the feed roller (3) idles as the paper is pulled out.

To print on the paper (2a) set on the platen (5), move the carriage unit (7) to the platen (5).
, move the required amount along the guide supports (8) and (9), select the type on the type wheel (10) by rotating the selection motor (11), and press the impact hammer (
12) to impact and print the specified characters,
(13) is a ribbon cassette that holds an ink ribbon (13a).

Then, the paper on the platen (2a
) is delivered into the stacker (15) by rotation of the platen (5) and the discharge roller (14). Of course, in connection with this feeding, the next paper (2) is moved by the feed roller (
3), it is fed out toward the platen (5) as described above. After that, repeat the above operation and install the hopper (1
The sheets (2) in ) are sequentially transferred to the stacker (15) side.

However, in the above conventional example, the automatic paper feeder (A) section, which consists of the hopper (1), feed roller (3), friction pad (4), etc., does not have mechanisms such as the platen (5), carriage unit (7), etc. It is mainly attached to the upper part of the printing device (B) in a removable manner by insertion. This has the disadvantage that the unitized automatic paper feeder (A) becomes a very expensive accessory.

In addition, in the conventional example where the automatic paper feeder (A) is used as described above, the paper set on the platen (5) (
When printing 2a), the paper (2a) is bent back to the space position between the feed roller (3) and the pressure roller (6) because the feed roller (3) cannot rotate in the reverse direction. The amount of back movement is
It is kept extremely small. For this reason, there was a problem in that the amount of back line feeds could only be returned by a small amount, which was the lack of back line feeds.

1-11 This invention aims to solve the above-mentioned problems of the conventional method and reduce the cost of the automatic paper feeder.The purpose is to integrate the automatic paper feeder with the printing device in advance. In addition, the amount of back feed for paper set on the platen can be effectively increased without any problem, and paper other than automatic paper feed can be fed from other paper feed ports. To provide a paper feeding mechanism that allows easy manual feeding of paper.

1-One Latch Next, the present invention will be described based on an embodiment shown in the drawings.

In FIG. 2, reference numeral (C) indicates an automatic paper feeder, and first, the operation of this automatic paper feeder (C) will be explained. This automatic paper feeding device (C) is located below the printing device (D). ! (D) is integrated with the hopper (20) that stores paper (cut paper) (20).
21), a feed roller (22) that takes out the sheets one by one from the hopper, a friction pad (23) that is pressed by this feed roller, and a guide (24) that guides the fed sheets upward. , a pocket (25), and a paper feed path (26). Therefore, when the feed roller (22) rotates counterclockwise as shown in the figure, the friction of the roller causes one sheet of the paper (20) on the top surface of the hopper (21) to be fed out while being squeezed by the fringe pad (23). , Guide (2
4), the sheet is guided upward and reaches the paper feed path (26).

Then, the above-mentioned paper that is guided upward is transported through the paper feed path (2
6) Printing device along! It is fed out toward the platen (27) and pressure roller (28) in (D). Note that, in the same manner as described in the conventional example, after the leading edge of the sheet (20) is fed to the contact position between the platen (27) and the pressure roller (28), the sheet (20) is The paper (20) is fed out so that it is fed and deflected, and then the feed roller (20)
2) stops the feed rotation.

Next, the platen (27) rotates a predetermined amount clockwise in the figure, draws in the paper (20) that has been fed out between it and the pressure roller (28), pulls the paper up to a predetermined position, and moves the paper to the platen. (27). At this time, the feed roller (22) idles as the paper is pulled out.

The printing operation on the paper (20a) set on the platen (27) is the same as that described in the conventional example.

The carriage unit (29) is moved along the guide supports (31) and (32) by the drive of the space motor (30) by the required amount along the platen (27), and the type on the type wheel (33) is moved to the selexigon. A specified character is selected by rotation of the motor (33a) and printed by impacting a specified character with an impact hammer (34). (35) is a ribbon cassette that holds the ink ribbon (35a).

On the other hand, the paper (20a) on which predetermined printing has been completed is sent into the stacker (37) by the rotation of the platen (27) and the rotation of the discharge roller (36). Of course, in connection with this feeding, the next sheet (20) is moved by the feed roller (
22), it is again extended to the position of the pressure roller (28).

By the way, the paper feeding mechanism according to the present invention feeds the paper set on the platen (27) during the printing process.
20a), the paper (20a) that has been pulled out toward the platen (27) will be fed by the pressure roller (28) even if the trailing edge of the paper remains near the exit of the feed roller (22). The paper (20a) returned to the paper path (26) can be accommodated in the pocket (25) by being bent easily, as shown in the figure (20b), and the so-called back line feed amount takes up a considerable amount of space. Even when the vehicle is moving backwards, it can be accurately allowed to move backwards without any trouble.

Next, a case will be described in which another sheet is manually fed to the printing device (D) without using the automatic sheet feeding device (C).

In this case, the sheet (38) to be manually fed (indicated by a dashed line in the figure) can be easily manually fed into the paper feed opening (40) of the deflector (39) provided along the platen (27) by normal means.

In the above, the conventional manual paper feed system uses the automatic paper feed system shown in Figure 1! [(A) Printing device! (B) and then insert the paper into the paper feed slot used in the automatic paper feeder (A). However, in this invention, the automatic paper feeder (C) is located at the bottom of the printing device (D). Therefore, manual paper feeding other than automatic paper feeding can be performed quickly and easily without removing the automatic paper feeding device (C).

Summer - Ichika This invention's paper feed I! As described above, the structure allows manual paper feeding other than automatic paper feeding to be easily set in the printing device while the automatic paper feeding device remains attached to the main body of the printing device, and the automatic paper feeding device can be attached to and removed from the printing device. Since this is not necessary, the configuration of the automatic paper feeder becomes extremely simple and costs can be reduced.

Furthermore, in automatic paper feeding, the back line feed is greatly restricted in conventional automatic paper feeding means, but the restriction on the amount of back line feed can be significantly eliminated.

Therefore, this means that, for example, in the conventional example, the back line feed amount was about 1 inch, but in this embodiment, the back line feed amount is approximately 1 inch when printing on 14th edition paper, for example. It is possible to back up from a line to the first printed line, and corrections and addition of underlines in the back line feed range can be easily and quickly performed.

Therefore, according to the paper feeding mechanism of the present invention, in a printing apparatus using an automatic paper feeding device, the paper feeding operation to the printing apparatus is extremely convenient.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the main parts showing an example of use of a conventional automatic paper feeding device, and FIG. 2 is an explanatory diagram of the main parts showing the usage state of the paper feeding mechanism according to the present invention. (C)...Automatic paper feeder (D)...
...Printing device (20), (38) ... Group, paper (25) ...
...Pocket (26) ...Paper feed passage (40) ...Paper feed port Patent applicant Shun Nakao, Patent attorney for Ricoh Co., Ltd. Intermediate

Claims (2)

[Claims] (1) In a printing device equipped with an automatic paper feeder, the automatic paper feeder is arranged at the bottom of the printing device, and the automatic paper feeder supplies paper from below to the printing device, and the automatic paper feeder A paper feed mechanism characterized in that the manual paper feed for the printer is configured such that paper can be inserted into the paper feed port of the printing device from above. (2) In a printing device equipped with an automatic paper feeding device, the paper fed back toward the printing device from the automatic paper feeding device disposed at the bottom of the printing device is fed into the paper feeding path, and the paper is returned by a back line feed. The paper feeding mechanism according to claim 1, characterized in that a pocket is provided.