JPH0427655Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a paper feeding device attached to a printer, typewriter, copying machine, etc.

[Technical background of the invention]

Generally, printing devices such as printers and typewriters are supplied with paper for printing from a paper feeding device. This paper feed device is attached to the paper feed/output port of the printing device.
The paper stacked on the paper tray is fed to the platen of the printing device using the paper feed roller or one sheet of paper is fed manually, and the paper that has been printed on the platen is passed between the paper ejection roller and the paper ejection guide. It is designed to be stored in the paper output tray.

In such a paper feeding device, the set lever is rotated to rotate the paper tray around the rotation axis toward the paper feed roller, and the coil spring tensioned between the fixed part and the paper tray is returned to its original position. The paper is pressed against the paper feed roller by the force.

In addition, in order to feed paper of several sizes, side edge guides that slide along the rotation axis are provided on both sides of the paper loading table, and the side edge guides are moved according to the paper size. Holds and guides the paper to prevent it from shifting.

[Problems with background technology]

By the way, after the side edge guides of the paper loading table have been positioned according to the paper size, they are required not to be easily displaced due to vibrations during paper feeding. For this reason, a leaf spring is interposed between the side edge guide and the rotating shaft, and its return force applies a certain amount of load to the movement of the side edge guide.

Therefore, although there is no displacement of the side edge guide after the paper is set, the leaf spring always acts as a load, making it difficult to move the side edge guide when setting the paper.

Additionally, there are devices in which the side edge guide is screwed to the paper table or rotation shaft, but the operation is cumbersome as the screw must be loosened and the side edge guide moved, and then the screw must be tightened.

[Purpose of invention]

This idea creates an easy-to-operate paper feeding device that allows the side edge guides to be moved with low load when setting paper on the paper tray, and that prevents the side edge guides from shifting from their predetermined positions during paper feeding. The purpose is to obtain.

This invention is based on a paper feeding device that feeds laminated paper sheets one by one using a paper feeding means. a rotating shaft that is rotatably supported; and a rotating shaft that is mounted on the rotating shaft and is movable in the axial direction, rotates integrally with the rotation of the rotating shaft, and allows the stack means to swing freely. a rotating member that is held on the rotating member, an elastic member that has one end fixed to the rotating member and whose other end engages with the stacking means to urge the stacking means toward the sheet feeding means, and the rotating shaft. The operating means is provided with a position where the biasing force of the biasing means is released by engaging and disengaging from the biasing means, and an operating means which rotates the rotating shaft at any time to a position where the biasing force is applied.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings.

In this embodiment, as shown in FIG.
The paper feed device 3 attached to the paper feed/discharge port 2 will be explained as an example.

First, the printing device 1 includes a platen 5 attached to a platen shaft 4, a head carriage 6 that can reciprocate in the lateral direction along the platen 5, a print head 7 attached to the carriage 6, and a print head 7 attached to the print head 7 around the platen 5. It includes a guide 8 and pinch rollers 9 and 10 provided along the surface.

On the other hand, the paper feed device 3 has side frames 11 on both sides.
(Only one side frame is shown in the diagram.)
an arcuate support portion 1 that fits with the platen shaft 4;
It has 2.

Further, inside the side frame 11, a lock lever 13 is supported at its intermediate portion by a shaft 14.

This lock lever 13 is used to fix the paper feeder 3 to the platen shaft 4, and has an engaging portion 15 at one end that engages with the platen shaft.

A rectangular shaft 16 is provided at the rear of the side frame 11 and is rotated by operating a set lever 17 as a manual operating means. This square shaft 16 is connected via a bearing 18 as a rotating member to a paper mounting table constituting a stacking means and side edge guides 19L and 19 integrated therewith.
R is installed. Note that the bearing 18 is a square shaft 16.
can be moved in the length direction. Also, side edge guide 1
9L and 19R are rotatable with respect to the bearing 18. Therefore, the side edge guides 19L and 19R are rotatable with respect to the square shaft 16 via the bearing 18.

Between the bearings 18, 18 at both ends of the side edge guide 19R, as shown in FIG. A collar that is part of the moving member is fitted.

This collar 20 has a biasing means such as a leaf spring 21.
One end is fixed. The other end of the leaf spring 21 is adapted to come into contact with the bottom of the side edge guide 19R when the square shaft 16 rotates.

The side edge guides 19L, 19R are provided with side plates 22L, 22R on one side, respectively. These side plates 22L, 22R are provided with cutouts 25 as shown in FIG. 1, which support roller receivers 24L, 24R made of synthetic resin, for example, which are attached to paper feed rotors, such as paper feed rollers 23L, 23R. There is.

Further, separation levers 27L and 27R having separation claws 26L and 26R are rotatably supported by shafts 28L and 28R.

Note that the paper feed rotating body is not limited to a roller, but may be a belt or the like.

At the front bottom of the side edge guides 19L and 19R, there is a second
As shown in the figure, a shaft 29 is inserted through the shaft 29, and the side edge guide 19L is fixed to this shaft 29.
R is movable in the length direction.

Further, the shaft 29 and the square shaft 16 are connected to the plate 30.
combined. Note that the plate 30 is attached to the square shaft 16
It is rotatable in the circumferential direction.

Furthermore, paper feed frames 31L and 31R are detachably attached to the rear portions of the side edge guides 19L and 19R.

The paper feed rollers 23L, 23R and roller receivers 24L, 24R are attached to a square shaft 32 connected to a motor.

An L-shaped guide plate 33 is provided in front of the side edge guides 19L, 19R.
A regulation stopper 34 is attached to the surface facing 9R.

A manual feed guide plate 35 and a paper discharge guide plate 36 are attached in front of the paper feed rollers 23L and 23R, forming a manual feed slit 37. Note that a paper ejection frame 38 for holding ejected paper is removably attached to the manual feed guide plate 35.

A paper ejection roller 40 is attached to a drive shaft 39 on the paper ejection guide plate 36, and together with a paper ejection guide 42 which rotates around a shaft 41, guides the paper toward the paper ejection frame 38 side. Note that this paper ejection frame 38, the manual feed guide plate 35, and the paper ejection guide plate 36
and constitute a paper output tray.

In the above configuration, the paper is placed on the side edge guide 1.
9L and 19R, when the side edge guides 19L and 19R are lowered as shown in FIG.
Move R along axes 16,29. At this time, since the edge of the notch 25 of the side plate 22R is engaged with the roller receiver 24R, the roller receiver 24R and paper feed roller 23R move together with the side edge guide 19R.

Further, the collar 20 provided between the bearings 18, 18 of the side edge guide 19R moves along the shaft 16. At this time, since no load is applied to the collar 20, it moves smoothly.

Once the position of the side edge guide 19R is determined according to the paper size, the set lever 17 is rotated. This causes the corner shaft 16 to rotate clockwise in FIG. This causes the collar 20 to also rotate.

Since one end of the leaf spring 21 is fixed to the collar 20, the other end touches the bottom of the side edge guide 19R and the leaf spring 21 is elastically deformed to move the side edge guide 19R.
Push up.

Since the side edge guide 19L is connected to the side edge guide 19R via the shaft 29, the side edge guide 19
Along with R, the side edge guide 19L rises.

Then, due to the elastic deformation of the leaf spring 21, the collar 20
is pressed against the square shaft 16.

When the paper is pressed against the paper feed rollers 23L and 23R, the setting is completed. At this point, the collar 20 is brought into maximum pressure contact with the square shaft 16 due to the restoring force caused by the elastic deformation of the leaf spring 21, and the collar 20 is fixed to the square shaft 16.

In such a state, when a printing command is given to the printing device 1 from a computer or the like, the square shaft 32 rotates and the paper is pushed out by the paper feed rollers 23L and 23R. At this time, both front ends of the paper are caught by the separation claws 26L and 26R, and when the paper bends and bounces beyond its elastic limit, it is separated into one sheet, passes between the holding plate 33 and the manual feed guide plate 35, and is guided to the platen 5. 8.

When the paper is wrapped around the platen 5 and printed by the print head 7, the paper enters inside from the front of the paper ejection guide 42, passes between the paper ejection guide 42 and the paper ejection roller 40, and then passes through the paper ejection guide 36 and the paper ejection guide 42. It is housed and held in the frame 38.

When the number of sheets held by the side edge guides 19L and 19R decreases and the sheets stop moving in this way, or when the size is changed, the set lever 17 is returned to its original position. As a result, the square shaft 16 rotates to the left, and the leaf spring 21 returns to its original state. Therefore, as the side edge guides 19L and 19R descend, the pressing force of the collar 20 against the corner shaft 16 weakens. When the state is completely released, the pressing force of the collar 20 disappears and the side edge guide 19R is moved to the shafts 16, 2.
9, and the size can be changed.

As described above, according to this embodiment, the square shaft 16 is rotatable in the circumferential direction with respect to the square shaft 16.
A side edge guide 19R is attached via a bearing 18 that is movable in the length direction of 6, and a collar 20 is provided that is fixed to the corner shaft 16 in the circumferential direction and is movable along the length direction with the side edge guide 19R. , this color 2
One end of the leaf spring 21 is fixed to the square shaft 16 at the other end.
When the side edge guides 19R are rotated, the side edge guides 19R are pushed up, so when the side edge guides 19L, 19R are not in pressure contact with the paper feed rollers 23L, 23R, no force is acting on the collar 20, so that they can move freely laterally. When feeding paper, the elastic force of the plate spring 21 causes the collar 2 to
0 is pressed against the square shaft 16, so it is fixed.

Therefore, while the side edge guide 19R can be fixed during paper feeding, it can be easily moved when setting paper, without any trouble.

Also, the paper feed roller 2 of the side edge guides 19L and 19R
Pressure force to 3L, 23R and side edge guide 19R
A single leaf spring 21 provides a pressure contact force that prevents misalignment of the
The structure is very simple and inexpensive.

One embodiment of this invention has been explained above,
This invention is not limited to the above embodiments.

For example, in the embodiment described above, since the paper is set based on one side, the slideable side edge guide 19
Although the leaf spring 21 is attached only to R, it may also be attached to the side edge guide 19L in the case of center reference.

Further, although the leaf spring 21 is shown as the elastic material, it may be made of a highly elastic material such as synthetic resin or a coil spring. When using a coil spring, for example, fit the collar 20 and the coil spring onto the square shaft 16,
One end of this coil spring is fixed to the collar 20, and the other end pushes up the side edge guide 19R.

Further, in the above embodiment, the paper mounting table and the side edge guide are integrated, but the paper mounting table and the side edge guide are separate, and the side edge guide is placed on the paper mounting table in the width direction of the paper. It can also be applied to moving objects.

In the embodiment described above, the side edge guide 19R, which is integrated with the paper table using the plate spring 21, is directly connected to the paper feed roller 23L,
23R side, one end of which is fixed to a sliding body such as the collar 20, and a lever or pad may be attached to the other end of an elastic material such as a plate spring or coil spring to indirectly bias the spring.

Furthermore, the rotation axis of the paper mounting table and the rotation axis of the sliding body may be separate.

According to the paper feeding device according to the present invention, the paper feeding device feeds the laminated paper sheets one by one using the paper feeding means, and is movable in the width direction of the paper sheets, and holds the side edges of the paper sheets while placing the paper sheets thereon. a stacking means for rotating the rotary shaft; a rotary shaft rotatably supported; a rotary shaft mounted on the rotary shaft, movable in the axial direction; a rotating member for swingably holding the stacking means; and an elastic member having one end fixed to the rotating member and the other end engaging the stacking means to urge the stacking means toward the sheet feeding means. a member, and a position where the member is engaged with and disengaged from the rotation shaft to release the urging force of the urging means;
and an operating means for rotating the rotating shaft at any time at the position where the biasing force is applied, the stacking means can be moved and adjusted very easily with little resistance when setting sheets on the stacking means. Moreover, after the paper is set, the stacking means does not shift from the set position, and the paper can be reliably held in position.

[Brief explanation of drawings]

Figures 1 and 2 are views showing one embodiment of this invention, with Figure 1 being a sectional view showing the internal structure of the paper feeder, and Figure 2 being a sectional view showing the area around the side edge guide with some parts omitted. It is a figure showing a structure. 16... Square shaft, 17... Set lever, 18...
...Bearing, 19L, 19R...Side edge guide, 20...
...Color, 21...Plate spring, 23L, 23R...
Paper feed roller.

Claims (1)

[Scope of Claim for Utility Model Registration] In a paper feeding device that feeds stacked sheets of paper one by one using a paper feeding means, a stacking means that is movable in the width direction of the paper and that places the paper and holds the side edges of the paper. , a rotary shaft rotatably supported, and a rotary shaft mounted on the rotary shaft and movable in the axial direction,
and rotates integrally with the rotation of the rotation axis,
a rotating member for swingably holding the stacking means; and an elastic member having one end fixed to the rotating member and the other end engaging the stacking means to urge the stacking means toward the sheet feeding means. a member; and an operating means that engages and disengages from the rotating shaft to release the urging force of the urging means, and an operating means that rotates the rotating shaft at any time to a position where the urging force is applied. A paper feeding device characterized by being provided.