JPS6194933A - Recording form pressing mechanism for paper feeding device - Google Patents

Abstract

PURPOSE:To enable a pressing force against a paper form to be adjusted extensively allowing the right and left pressing force to be easily symmetrical by dividing a contact surface of a paper form press unit which is made of an U-shaped spring, with the paper form into a right and a left contact surfaces so as to adjust the width of an opening of the U-shaped spring at places just above the both contact surfaces. CONSTITUTION:A paper form press unit 1 is made of a spring in a form of a letter 'U' and its (1) contact surface with the paper form is divided into two separate contact surfaces: a right surface 1a and a left one 1b. The width of an opening of the U-shaped spring is adjusted by means of a screws 3, nuts 5, and helical springs 4 which are installed at places just above the right and left contact surfaces 1a and 1b as if the opening were housed in. The adjustment of the opening of the U-shaped spring allows the curvature of the circular portion of the spring to be increased or decreased permitting the right and left contact surfaces 1a and 1b to be lowered or elevated respectively in regard to the paper form. Consequently, this allows the pressing force of the right and left contact surfaces to be adjusted independently. Thus, the adjustment enables the symmetry of the pressing forces about the center of right and left to be easily secured preventing a skew from taking place.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention applies to an electronic copying machine or the like in which a copy sheet is transferred from a paper feed cassette to a toner image transfer section, etc. When sending out toward the production department, the pressing force of the recording paper of a copying machine, etc. against the paper feed roller can be adjusted over a wide range, and [1. A recording paper press for a paper feeding device in which the paper press member is configured with a U-shaped temporary spring, and the contact surface between the press member and the recording paper is divided into left and right parts so that the respective pressing forces can be adjusted independently. Regarding the mechanism.

[Conventional technology]

Figure 2+a) and (bl show the configuration of a paper feeding device using a conventional recording paper pressing member (lever paper), and Figure 2(b)
In l, 11 is the paper feed power cent, 12 is the recording paper stored in a stacked state (hereinafter abbreviated as paper), 12 is the one sheet of paper at the bottom, and 13 is the paper feed cassette. 11 is a paper feed operation groove provided on the bottom surface; 14 is a paper feed roller that contacts the paper 12a and sends the paper toward a transfer section (not shown) while rotating in the direction of the arrow; A paper feed slot 1 provided at the end of the paper feed cassette 11 to allow the paper to pass through is a paper pressing member that presses the paper 12 toward the paper feed roller 14 with an appropriate force. Second
Figure (al is an arrow view showing the configuration of the paper pressing member 1, 1a
2 has a cross-sectional shape of an arcuate portion, and 2 is a contact portion that contacts the top surface of the paper 12 and applies a force in the direction of the arrow. condition)
It is pressed against the fixed part 16 by the sponge rubber. Reference numeral 6 denotes a circular hole forming a part of a hinge mechanism 17 for rotatably attaching the paper pressing member 1 to the fixing portion 16.

The sponge rubber 2 is sandwiched between the fixed part 15 and the paper 12,
A compressive force is received from above and below, and at the same time, a force f in the direction of the arrow is applied to the paper 12 as a reaction. This is the cause of the frictional force acting between the bottom paper 12a and the paper feed roller 14 (and thus the paper feeding force).

[Problem that the invention seeks to solve]

However, in this recording paper pressing member for a paper feeding device,
Since the paper pressing force f depends on the elasticity of the sponge rubber 2, the range of the pressing force is limited, and the optimum pressing force is generated depending on the amount of paper remaining in the paper feeder slot 1. That is impossible. Furthermore, high precision is required for the contours of the paper 12 and spongilla) <-, and if there are deficiencies in the shape, dimensions, and installation precision, a lateral imbalance will occur in the paper feeding force, and skew (the paper will A phenomenon in which the paper is sent out in an inclined position with respect to the direction of the paper) occurs, and it is impossible to eliminate this phenomenon by finely adjusting the pressing force.

[Means and effects for solving the problems] The present invention has the following features:
This was done in view of the above, and the paper pressing member is made into a U-shape in order to be able to adjust the paper pressing force over a wide range and to ensure left-right symmetry to prevent the occurrence of skew. It consists of a plate spring, and the contact surface between the member and the paper is divided into left and right parts, and a screw, nut, and helical spring are installed to bridge the width of the U-shaped opening directly above the contact surface. The present invention provides a recording paper pressing mechanism for a paper feeding device, each of which can be adjusted independently.

Hereinafter, the recording paper pressing mechanism for a paper feeder according to the present invention will be described in detail.

[Example] Fig. 1 shows an embodiment of the present invention, in which (al is a view in the direction of arrows showing the configuration of a recording paper pressing member for a paper feeder according to the present invention, and Fig. 1 (b) is an illustration of the member. 21 is a cross-sectional view showing how it is attached to a paper feeding device.As seen in FIG. 21(a), the paper pressing member 1 has two U-shaped temporary springs arranged in parallel and connected together. It has a structure connected by a member 1e, 1a and 1b are the left and right contact parts with the paper 12, lc,
ld are the heads of the left and right U-shaped spring members, respectively, which abut on the fixing part 16 when attached to the device, as shown in FIG.
It is no different from the case of l. Further, 3 is a screw, 4 is a helical spring, and 5 is a NAND, which are attached to the pressing member so as to bridge the U-shaped opening as shown in FIGS. 1(b) and 3. width (point A in Figure 3,
B interval).

That is, 3 passes through a through hole provided near the head of the U-shaped spring member and bridges the U-shaped opening, and napht 5 is threadedly engaged with the screw 3 at its bridge portion. Here Natsuto 5
does not come into direct contact with the U-shaped spring member, and a helical spring 4 is interposed between them.

As shown in Fig. 3(a) and (bl), when the screw 3 is tightened, the distance between the head of the screw 3 and the nut becomes closer, and the width of the U-shaped opening (distance between AB) As a result, the radius of curvature of the U-shaped arc portion decreases, and the contact surface 1a (lb not shown) protrudes downward and strongly presses the paper 12 (FIG. 3(a)).On the contrary, the screw 3, the width of the U-shaped opening increases, the radius of curvature of the U-shaped arc increases 330, the contact surface 1a retreats upward, and the pressing force on the paper 12 decreases (see Figure 3 (b). )) Here, both ends of the U-shaped opening are tightened by the screw 3 and nut 5 via the helical spring, so the paper pressing force can be smoothly adjusted over an extremely wide range, and this adjustment operation Since this can be performed independently for the left and right U-shaped members, it is extremely easy to finely adjust the pressing force to maintain left and right balance.

〔Effect of the invention〕

As explained above, according to the recording paper pressing mechanism for a paper feeding device of the present invention, the paper pressing member is constituted by a U-shaped spring member, and the contact surface between the member and the paper is divided into left and right sides, and the contact surface between the member and the paper is divided into left and right parts, and By adjusting the width of the U-shaped opening directly above the surface using a screw nand and a helical spring installed to bridge this width, the left and right paper pressing forces can be adjusted independently, making it extremely simple. Moreover, by using economical means, it has become possible to freely adjust the paper pressing force over a wide range, and to easily ensure left-right symmetry of the pressing force.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) --- Diagrams showing an embodiment of the present invention. FIGS. 2(a) and 2(b) are diagrams illustrating the configuration of a conventional paper pressing member and how it is attached to a paper feeding device. FIGS. 3(a) and 3(b) -1111-- Diagrams for explaining the pressing force adjustment mechanism of the U-shaped spring member. Code table 1----1 Paper pressing member of the present invention, 1a, 1b---Contact surface between the members and paper, 1c, 1d---Head of U-shaped spring member, 1e-----Connection member, 2-----Sponge rubber, 3--Screw, 4-----Helical spring, 5-----Nut, 6--
Circular hole, 11--paper feed cassette, 12---1 stacked copy paper, 12a----lowermost paper,
13---Paper feed operation hole, 14---One feed roller,
15-- Paper feeding slit, 16-- Fixed part.

Claims (1)

[Claims] Used in a paper feeding device that feeds recording paper stacked and stored in a paper feeding cassette one sheet at a time by the frictional force of a rotating paper feeding roller, and directs the recording paper toward the paper feeding roller. A recording paper pressing mechanism for a paper feeding device that presses from a position facing the paper feeding roller is formed in a U shape, and presses the recording paper from a position facing the paper feeding roller with its arcuate part,
a leaf spring member whose pressing force is controlled by adjusting the radius of curvature of the arcuate portion; and a leaf spring member that engages with a non-arc portion of the leaf spring member and controls the opening width of the non-arc portion to adjust the radius of curvature of the arcuate portion. A recording paper pressing mechanism for a paper feeding device, comprising an adjustment member for adjusting.