JPH0358980B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a paper feeding device that can be employed in electronic copying machines and electrostatic printers.

(b) Prior Art As shown in FIGS. 2 and 3, a conventional paper feeding device includes a paper feeding cassette 2 and a paper loading plate 1 that is vertically swingable. , by contacting the front edge of the paper feed cassette 2,
A detection lever 3 is provided which is slightly displaced in the mounting direction of the paper feed cassette 2. A bending through hole 4 is bored in the lower part of the detection lever 3, and the upper part is swingably connected to the free end of the arm 5a of the manual paper feed tray 5. A coil spring 6 biases the detection lever 3 toward the end surface of the paper feed cassette 2. The center portion of the arm 5a of the manual paper feed table 5 is swingably supported by a support shaft 7 on a base (not shown). Reference numeral 8 denotes an inverted L-shaped roller lever, the bent portion of which is swingably supported on the base via a support shaft 9. A guide pin 10 that is inserted into the through hole 4 of the detection lever 3 is implanted at the lower free end of the roller lever 8, and a paper feed roller 11 is installed at the left free end. It is attached via a directional clutch. Note that this paper feed roller 11 is provided with means (not shown) for selectively applying rotational force.
is connected. 12 is the paper feed roller 11
This is a coil spring that presses the paper 13 or the manual paper feed tray 5 at the top. Note that the detection lever 3 is not pivotally supported on the base.

When the manual paper feed tray 5 is in the non-manual paper feed position as shown in FIG. 2, the roller lever 8 is biased counterclockwise by the tension spring 12. , the paper feed roller 11 feeds the uppermost paper 1
3. At this time, the guide pin 10 of the roller lever 8 is located above the through hole 4 of the detection lever 3.

Further, when the manual paper feed table 5 rotates around its support shaft 7 to the manual paper feed position as shown in FIG.
1, and this paper feed roller 11 slightly rotates in the paper feeding direction. Therefore, each time the manual paper feed tray 5 is moved to the manual paper feed position, the paper 13 in the paper feed cassette 2 is fed out little by little by the paper feed roller 11, causing a paper jam.

(C) Problems to be Solved by the Invention As mentioned above, in the conventional technology, the detection lever is unstable because it is not pivotally supported on the base, and accordingly, the operation of the roller lever 8 is also unstable. Become. Therefore, the paper feed roller 11 is not properly pressed against the paper 13, causing a paper feeding failure.

Furthermore, as described above, the paper feed roller 11 rotates slightly each time the manual paper feed table 5 is moved, so paper jams are likely to occur.

(d) Means for Solving the Problems The present invention provides a paper feed cassette in which paper is loaded and stored, and a paper feed cassette that is rotatably mounted on a support shaft fixed to a base and that is attached to one end of the paper feed cassette. a lever rotationally biased in a first direction by abutting the lever;
a lever biasing spring that rotationally biases the lever in a second direction opposite to the first direction; and a pressure spring rotatably attached to the support shaft and interposed between the lever and the lever. a swinging arm whose free end is biased in the first direction toward the upper surface of the paper feed cassette by a swing arm; and a paper feed roller mounted near the free end of the swing arm. and a manual paper feed tray that can take two positions, a manual paper feed position and a non-manual paper feed position, and when this manual paper feed tray is in the manual paper feed position,
The paper feeding device includes means for biasing the swinging arm in a second direction against the pressing spring.

(E) Operation When the paper feed cassette is installed, the lever is biased in the first direction against the lever biasing spring, and the paper feed roller is pressed against the upper surface of the paper. Also, if you move the manual paper feed tray to the manual paper feed position,
The swing arm to which the paper feed roller is attached is biased in the first direction, and the paper feed roller is separated from the paper without rotating.

(F) Embodiment FIG. 1 and FIGS. 4 to 7 show an embodiment of the present invention, in which FIG. 1 is an exploded perspective view of the main parts, and FIG.
The figure is a front view showing a state in which the manual paper feed tray 101 is in the non-manual paper feed position and the paper feed cassette 102 is not installed. It is a front view showing a state where it is attached. Further, FIG. 6 is a front view showing a state in which the manual paper feed tray 101 is in the non-manual paper feed position and the paper feed cassette 102 is not installed, and FIG. 7 is a front view showing the state shown in FIG. 6. FIG. 3 is a front view showing a state in which a paper feed cassette 102 is attached.

In these figures, reference numerals 103, 103 are a pair of levers that are swingably attached to support shafts 104, 104 implanted in a base (not shown) via sleeves 105, 105. A soft contact piece 106 that contacts one end of the paper cassette 102
is fixed. In addition, the lever 103,1
03 has this lever 103,1 between it and the base.
Spring 1 that biases 03 clockwise (second direction)
07,107 is strung up. Said sleeve 1
05, 105, a pair of swinging arms 108, 108
The base end of the swing arm 10 is rotatably attached to the swing arm 10.
At the free end of 8,108 there is a sleeve 109,1
A rotating shaft 110 is attached via 09. Paper feed rollers 111 and 1 are attached to this rotating shaft 110.
11, 111 are fixed, and the manual feed tray 1
Collars 113, 113 that engage with the engagement recesses 112, 112 of 01 are loosely fitted. It should be noted that the paper feed rollers 111, 111, 111 are configured so that a rotational force is applied to them by means not shown, similar to the conventional example. The swing arms 108, 108 have a guide pin 1 implanted in the lever 103.
Elongated holes 115, 115 into which 14 is inserted are bored. Further, a torsion spring 116 is fitted into the sleeves 105, 105, one end of the torsion spring 116 is locked to the lever 103, and the other end is locked to the swinging arm 108.
8 in the counterclockwise direction (first direction).
The manual paper feed tray 101 has a pair of arm portions 101a,
101a is formed to extend, and this arm portion 101
Through holes 117, 117 are bored in a, 101b,
A pin 118 of the base is inserted through the through holes 117, 117. Reference numeral 119 denotes a protrusion provided on the main body of the apparatus, which serves as a stopper for the paper feed cassette 102 and the lever 103.

Therefore, in the state shown in FIG.
3, 103 and swing arms 108, 108 are springs 1
07,107. In this state, when the paper feed cassette 102 is inserted from the left side to the right, the paper feed cassette 102
The levers 103, 103 are rotated counterclockwise against the springs 107, 107 by the front ends of the levers 103, 103,
The paper feed roller 111 is pressed against the top of the paper 120.

On the other hand, when the manual paper feed tray 101 is rotated counterclockwise about the pin 118 with the paper feed cassette 102 not installed, the manual paper feed tray 1
01 recesses 112, 112 and the paper feed roller 11
The collars 113, 113 of the rotating shaft 110 of No. 1 are engaged, and the manual paper feed tray 101 is locked at the manual paper feed position, as shown in FIG.

Further, in the state shown in FIG.
When the paper feed roller 111 is moved to the manual paper feeding position, the rotating shaft 110 of the paper feeding roller 111 is lifted by the manual paper feeding table 101 via the collars 113, 113, as shown in FIG. At this time, color 113,
Since the rollers 113 are loosely fitted to the rotating shaft 110, the rollers 111, 111, 111 do not rotate and paper is not fed.

(g) Effects of the Invention In the present invention, the swinging arm on which the paper feed roller is mounted and the lever associated with this swinging arm are mounted on a support shaft fixed to the base. The paper roller is held stably at all times. Therefore, paper feeding failures do not occur.

Additionally, since the paper feed roller can be prevented from rotating when the manual paper feed tray is moved from the non-manual paper feed position to the manual paper feed position, paper jams can also be prevented from occurring. .

[Brief explanation of drawings]

1 and 4 to 7 show an embodiment of the present invention, and FIGS. 2 and 3 show a conventional example. Figure 1 is a perspective view, Figures 2 and 3 are front views showing different aspects, Figures 4, 5, and 6.
7 are front views showing different aspects. 101...Manual paper feed tray, 102...Paper feed cassette, 103...Lever, 104...Support shaft, 10
7... Spring, 108... Rocking arm, 110... Rotating shaft, 111... Paper feed roller, 112... Recess, 1
16...Spring, 113...Color.

Claims (1)

[Scope of Claims] 1. A paper feed cassette in which paper is loaded and stored, and a support shaft that is rotatably attached to a base,
a lever that rotationally biases the lever in a first direction by contacting one end of the paper feed cassette; and a lever biasing spring that biases the lever rotationally in a second direction opposite to the first direction. and a press spring that is rotatably attached to the support shaft and that is biased in the first direction toward the upper surface of the paper feed cassette by a pressure spring that is interposed between the support shaft and the lever. a swing arm, a paper feed roller mounted near the free end of the swing arm, and a manual paper feed stand that can take two positions: a manual paper feed position and a non-manual paper feed position. and means for biasing the swinging arm in a second direction against the pressing spring when the manual paper feed table is in the manual paper feeding position. 2. The paper feed roller is attached to the swing arm via a rotating shaft, and a recess is formed in the manual paper feed table to engage with the rotating shaft and bias the paper feed roller in the second direction. paper feed device.