JPS6011858Y2 - Paper feed device in printer - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a paper feeding device that feeds a print medium to a printer such as an electronic computer.

The printing media used in electronic computers include so-called continuous paper and sheet-like media, and the format for feeding sheet-like media is automatic paper feeding, which automatically and continuously feeds sheet-like media. and manual paper feeding, in which paper is fed one by one by hand.

A paper board (hereinafter referred to as a hopper board) that moves up and down in conjunction with the media guide board of the printer body.

), but in this case, while the same type of sheet media is being automatically fed, other types of sheet media may be manually fed. It is impossible to carry out jump processing, and the paper feed roller (hereinafter referred to as 'Pick Roll Roller') is used during manual paper feeding and continuous paper feeding.

) can get in the way. In order to avoid this problem, paper feeding devices are provided that have two paper feeding paths, automatic paper feeding and manual paper feeding. One type has a so-called inserter attached to the main paper feeding path for feeding paper and continuous paper to enable manual insertion processing, and the other has a type that allows manual paper feeding and paper feeding as shown in Figure 4. An automatic paper feeder 42 was provided below a paper feed plate 41 provided at a fixed position for feeding continuous paper.

However, in such conventional devices, since the two paper feed paths are provided separately and fixedly, the print medium may be bent significantly when passing through the paper feed path, causing various problems. In addition, the distance from the print medium supply port 43 to the feed roller 44 becomes longer, which increases the size of the device and makes it difficult to feed print media with a small length in the feed direction. It had drawbacks.

This idea was made in order to solve the above-mentioned problem, and the hopper stand for automatic paper feeding and the top plate mounted to cover the hopper stand can be raised and lowered as one unit. By using the top surface of the top plate as a paper feeding surface for manual paper feeding and continuous paper feeding, all paper feeding paths become approximately one plane, thereby preventing bending of the printing medium during paper feeding. The purpose of the present invention is to provide a small paper feeding device that is capable of feeding paper smoothly and accurately feeding even small-sized print media.

An embodiment of this invention will be described below based on the drawings.

1 to 3, 1 is a hopper stand, 2 is a bracket fixed to the hopper stand 1, 3 is a pivot shaft that pivots the hopper stand 1 to a fixed member (not shown), and 4 and 5 are the fixed members. 6 is a pulse motor for raising and lowering the hopper table 1; 7 and 8 are reduction gears that link the pulse motor 6 and the pulley 5; 9 is a belt wound around the pulleys 4 and 5; 10 is a horizontal rod fixed to the belt 9, and the front end of the hopper stand 1 is supported by the horizontal rod 10.

11 is a bracket provided at the front end of both measuring parts of the hopper table 1; 12 is a top plate; 13 is a pin for pivotally connecting the top plate 12 and the bracket 11; 14 is a stopper for supporting the rear end of the top plate 12; 15 is a pick roller drive shaft supported by a stationary member (not shown); 16 is a pick roller arm that is supported by the pick roller drive shaft 15; 17 is inserted between the hopper table 1 and the top plate 12, and the pick roller arm is inserted at both ends. A pick roller shaft is supported by a roller arm 16, 18 is a pick roller fixed to the pick roller shaft 17, 19 and 20 are pulleys fixed to the pick roller drive shaft 15 and the pick roller shaft 17, 21 is a pulley 19, A belt 20 is wound around the pick roller arm 16, a stopper 22 is provided to be pivotally supported on the pick roller drive shaft 15 to lock the pick roller arm 16 in its raised position, and a stopper 23 is attached to the pick roller drive shaft 15 to lock the pick roller arm 16 in its raised position. 24 is a link linking the solenoid 23 and the stopper 22;
5 is a medium guide plate fixed to the printer body, 26 is a holding plate for stabilizing the medium, 27 is a print head, 28 is a feed roller, and 29 is an automatic paper feeder loaded on the hopper stand 1. It is a suitable print medium.

In Figure 2, the hopper stand 1 is at the lower end, and the solenoid 23
This shows a state in which the pick roller 18 is lowered onto the printing medium 29 by its own weight after the excitation of the pick roller 18 is released, and in this state, the tip 12a of the top plate 12 is at a position where it connects with the medium guide plate 25 of the printer main body. In addition, the upper surface of the top plate 12 and the upper surface of the medium guide plate 25 are substantially in one plane.

Therefore, the manually fed print medium and continuous paper fed along the top surface of the top plate 12 are not bent significantly under the condition shown in FIG. is sent.

FIG. 3 shows the pick roller 1 when the solenoid 23 is energized.
8 is held in its raised position, and the hopper stand 1
2 shows a state in which the top surface of the print medium 29 is raised by the pulse motor 6 to a position where it comes into contact with the pick roller 18.

When the solenoid 23 is excited, the stopper 22
pushes up the pick roller arm 16, and the pick roller 1
The pick roller 18 is raised to a raised position where the lower end of the pick roller 8 is approximately at the same height as the upper surface of the medium guide plate 25, and the pick roller 18 is held at the raised position.

The pulse motor 6 includes a detection device (not shown) that detects contact between the pick roller 18 and the upper surface of the print medium 29.

), the hopper table 1 is raised to a position where the upper surface of the print medium 29 contacts the pick roller 18.

Therefore, in the state shown in FIG. 3, the upper surface of the print medium 29 is always on the medium guide plate 25 regardless of the amount of print medium 29.
Since the print medium 29 is substantially flush with the upper surface of the print medium 29, the print medium 29 is sent to the print section and the feed roller 28 without being bent significantly.

Note that 30 is a separation claw for separating and feeding the printing medium 29 one by one, and 31 is a guide plate for preventing the printing medium 29 from shifting, but these are not shown in FIG.

The reason why the top plate 12 is pivotally attached to the bracket 11 is to enable easy loading of the printing medium 29.

In addition to the above-mentioned mode, the top plate 12 may be mounted on the hopper stand 1 by pivotally mounting the top plate 12 around an axis parallel to the side of the hopper stand 1. In addition, the top plate 12 and the hopper stand 1 are provided integrally, and the print medium 29 is inserted and loaded from the opening on the operator side between the hopper stand 1 and the top plate 12. It is possible to do so.

Furthermore, in the above-described embodiment, the hopper stand 1 is raised and lowered by rotating around the pivot shaft 3, but the hopper stand 1 is raised and lowered in parallel using a pantograph device or other means. Of course it's a good thing.

As explained above, the paper feeding device according to this invention prevents the printing medium from being bent and fed in either automatic feeding or manual feeding of continuous paper or sheet-like printing media. This allows for smooth paper feeding, and the pick roller is installed under the top plate, making it possible to shorten the paper feeding path for manual paper, so the pick roller does not get in the way when manually feeding paper, and it is possible to handle small print media. It is also possible to design the paper feeding device itself to be compact without causing problems in paper feeding.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the paper feeding device according to this invention, with Figure 1 being a perspective view, and Figure 2 showing the state when continuous paper or manual paper feeding is performed. FIG. 3 is a side view of the main part showing the state when automatically feeding a sheet-like print medium, and FIG. 4 is a side view of the main part showing an example of a conventional paper feeding device. be. 1... Paper board (hopper stand), 2... Bracket, 3... Pivot shaft, 4, 5...
Pulley, 6...Pulse motor, 9...
Belt, 10...Horizontal rod, 12...Top plate, 16...Zeck roller arm, 18...
・Paper feed roller (pick roller), 22...
・Stopper, 23... Solenoid, 25...
...Media guide plate, 29...Printing medium.

Claims (1)

[Scope of utility model registration request] A paper feed tray consisting of a paper board and a top plate mounted to cover the paper board, a paper feed roller provided between the paper board and the top plate, and a top plate that is used as a medium for the printer body. The present invention includes a paper feed tray elevating device that raises and lowers the paper feed tray to either a position where it is connected to the guide plate or a position where the top surface of the medium loaded on the paper board is connected to the medium guide plate. A paper feeding device in a printer characterized by: