JPS6210268Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention uses a pushing means to force a paper stack upwardly and to face the lower part of a separation roller mounted on the machine body, and this upward bias separates the stacked sheets on the paper stack. A paper feeding device that is brought into pressure contact with a roller.
In particular, the purpose of the above-mentioned pressure force adjustment device is to use simple means to switch and adjust the pressure force applied to the separation roller of the paper stack depending on the paper quality of the paper.

By the way, such a device has conventionally been used, for example, in
- As shown in Publication No. 25317, etc., a paper loading table that stores paper is constantly pressed against a separation roller by a spring-biased push-up lever, and the rotation of this separation roller sequentially feeds out the paper starting from the topmost one. However, the above spring is a device,
Since this is done using a single spring that is set according to the paper quality, it is not always possible to obtain the optimum engagement with the separation roller when trying to feed out sheets of different paper thicknesses, paper qualities, etc.

In particular, when feeding paper to a printer, for example, thick paper with a smooth coated surface on which a company name is printed, and thin paper with a rough surface, the friction with the separation roller is very different, causing the leading edge of the paper to curve left and right, a so-called skew. Also, so-called "registration" in which the leading edge of the paper is fed out by a different amount tends to occur, and there are drawbacks such as misalignment of the print start line and bending of the print line, which significantly affects the print quality.

This idea was devised to eliminate the above-mentioned drawbacks.

First, details of the embodiment will be described with reference to the drawings.

Note that the paper feeding device referred to here includes a platen 2 at the front of the machine body 1, a separating roller 3 at the rear of the platen, and a paper stack facing the bottom of this roller, as shown in Fig. 1. A paper feed section 5 consisting of a table 4 and a paper discharge section 7 consisting of a pair of feed rollers 6 are formed, and the topmost sheet of stacked paper 8 on the paper table 4 is separated by the drive of the separation roller 3. The paper is separated by a separating claw 4' and sent to the platen 2, typed by a printing head 9 in front of the platen, and then taken out from a paper discharge section 7.

To be more specific, the paper mounting table 4 is provided with pins 10 on its left and right front and rear sides, and these pins 10 are provided in the front and rear elongated holes 1 of the left and right side plates 11 for paper guide provided in the machine body.
2 to guide the paper mounting table 4 so as to be vertically movable while keeping it parallel to the separation roller axis.

The paper mounting table 4 is supported by a lifting means having the following configuration. That is, the push-up lever 14 has a pair of front and rear push-up levers 14 having a roller 13 at the tip, and the lower surface of the paper table 4 is brought into contact with the roller 13. It is fixed to two parallel shafts 15 and 16, respectively, and gears 17 and 18 are respectively attached to one end of these shafts 15 and 16 to engage them, and one shaft 16 has a rotation lever. The proximal end of the lever 19 is fixed, and the tip pin 19a provided on the lever 19 is brought into contact with an operating lever 21 (corresponding to the operating means in the claims) pivoted on the fuselage, and the rotary lever 19 is attached to the fuselage. A first spring 22 (corresponding to the first urging means in the claims) having one end fixed thereto is connected to the other end to rotationally urge the rotary lever 19 toward the operating lever 21 side.

The operating lever 21 is provided with a pin 21a on its rotational eccentric portion, and this pin 21a is selected as the multi-stage cam recesses 24a, 24b, and 24c of the locking lever 24 whose base end is pivoted to the body by a shaft 23. A spring 25 is hooked to the locking lever 24 in order to engage the locking lever 24 in a switchable manner and to maintain this engagement.

The operating lever 21 has the rotating lever 19
The pushing cam surface 21 presses the tip pin 19a of the
A switching section is formed consisting of a restraint cam surface 21b connected thereto, a restraint release cam surface 21d connected thereto, and a pin 27a of a restraint lever 27 (corresponding to the pressure increasing means in the claims) whose base is pivotally supported on the machine body by a shaft 26 is selectively brought into contact with the restraint cam surface 21c and the restraint release cam surface 21d constituting this switching section, and a tip pin 27b is provided at the swing end of the restraint lever 27, and this pin 27b faces the underside of the driven edge 19b provided on the rotating lever 19 so as to be freely pushed up, and a second pressure increasing spring 28 (corresponding to the second biasing means in the claims) whose one end acting on the lever operation is fixed to the machine body is connected to the restraint lever 27 so that the restraint lever 27 is biased toward the operating lever 21. Reference numeral 29 denotes a guide for the pressure increasing spring 28.

Next, the operation will be described.

FIG. 4 shows a state in which the pin 21a of the operating lever 21 is engaged with the cam recess 24a of the locking lever 24.
This state is the push-out cam surface 21b of the operating lever 21.
pushes the tip pin 19a of the rotary lever 19, and the shafts 15, 16 are rotated by a predetermined amount via the gears 17, 18, so that the pair of front and rear push-up levers 14 attached to the shafts 15, 16 are symmetrically moved. The paper table 4, which has been laid down and is supported by the push-up lever 14, is maintained in a lowered state.

That is, there is a wide gap between the separating roller 3 and the paper mounting table 4, and in this state, the sheets are stacked and set on the paper mounting table 4.

Once the above settings have been made, next, in the state shown in FIG. 4, tilt the operating lever 21 counterclockwise as shown in FIG. 3 to engage the pin 21a with the next cam portion 24b of the locking lever 24. , so far the operation lever 21
The rotation lever 19 is rotated clockwise by the first spring 22, the gear 18 is rotated, and the gear 17 that meshes with it is also rotated. The shafts 15 and 16 rotate inwardly to each other, and the push-up lever 14 is symmetrically raised in a V-shape. Due to this tilting, the paper mounting table 4 is placed in a parallel condition using the elongated hole 12 of the side plate 11 as a guide. keep it and rise.

Therefore, the uppermost sheet of the stack of sheets on the paper tray 4 comes into pressure contact with the separation roller 3. Of course, this pressing force is due to the force of the first spring 22.

By the way, as mentioned at the beginning, the paper quality of the laminated paper can be hard or soft, and if the paper is hard, the pressing force of the separation roller of the paper mounting base by the first spring 22 may not be enough. .

Therefore, in such a case, operate as follows. That is, in the state shown in FIG. 3 above, that is, in the state in which the paper table 4 is raised by the first spring 22 and the paper is pressed against the separation roller 3, the operating lever 21 is further moved counterclockwise as shown in FIG. Defeat the pin 2
1a to the cam recess 24 next to the locking lever 24.
c. Therefore, in this engaged state, the intermediate pin 27a of the restraining lever 27 is still attached to the operating lever 2.
Therefore, although the second pressure increasing spring 28 is working, the restraining lever 27 is prevented from sliding, and therefore the pressure increasing spring 28 connected to this restraining lever 27 is in contact with the first restraining cam surface 21c. It does not contribute in any way to the upward biasing of the paper loading table 4 in FIG.

Therefore, if the operating lever 21 is operated as shown in FIG.
7a moves from the restraint cam surface 21c of the operating lever 21 to the restraint release cam surface 21d, and the restraint lever 27
The restraint of the restraint lever 27 is released, and the restraint lever 27 is thereby released.
Here, the force of the pressure increasing spring 28 causes the shaft 26 to
At the same time as it rotates counterclockwise around the fulcrum, its tip pin 27b pushes up the driven edge 19b of the rotating lever 19, so that the force of the pressure increasing spring 28 is further applied to the first spring 22, Therefore, the pressing force of the paper table 4 against the separation roller 3 is increased.

As described above, according to the present invention, a second urging means for increasing the pressure is provided, which is separate from the first urging means originally included in the means for pushing up the paper loading table, and this second urging means is activated. The biasing force of the second biasing means and the biasing force of the original second biasing mechanism are synergistically applied, and the paper loading table is pressed against the separation roller by a strong spring force. As mentioned above, it is possible to always obtain appropriate engagement of the paper with the separation roller regardless of the quality of the paper, hard or soft, and its features are great.

[Brief explanation of the drawing]

FIG. 1 is an explanatory side view of the paper feeding device, FIG. 2 is a plan view of a portion of the same, and FIGS. 3 to 5 are side views showing operating states of the main parts of the same. DESCRIPTION OF SYMBOLS 1... Machine body, 3... Separation roller, 4... Paper loading table, 21... Operating lever (operating means), 22...
Spring (first urging means), 28... Pressure increasing spring (second urging means), 27... Restraint lever (pressure increasing means), 13, 14, 15, 16, 1
7, 18, 19, 19a...Pushing means.

Claims (1)

[Scope of utility model registration request] A paper loading table faces the lower part of the separation roller mounted on the machine body and is supported so as to be movable up and down while keeping parallel to the machine body and the separation roller axis; a pushing up means having a first pushing means for pushing up the platform; a pressure increasing means having a second pushing means that engages and disengages from the pushing up means and increases the pushing force of the pushing means when engaged; and the pressure increasing means. an operating means that engages and disengages from the means and the pushing up means to raise and lower the paper platform, and the operating means engages with the pushing up means and the pressure increasing means by operating the operating means to lower the paper mounting platform. and biasing the paper loading platform upward by driving the first biasing means upon separation of the operating means and the pushing-up means, and further engaging the operating means with the pressure increasing means. The second biasing means is driven by the engagement between the pressure increasing means and the pushing up means upon release, and the biasing force thereof is added to the upward biasing force by the first biasing means. A mechanism for adjusting the pressure force applied to the separation roller of a paper loading table in a paper machine.