JPS60161837A - Pressure-release guide mechanism in paper pressure device for copying machine - Google Patents

Abstract

PURPOSE:To simplify both pressure and pressure-release guide mechanism for paper as well as to miniaturize a cassette itself, by turning round a guide arm by means of rocking motion in a guide cam in time of charging or discharging the cassette, while making a pressure lever so as to be shifted to a lower part of the cassette temporarily. CONSTITUTION:In time of charging or discharging a cassette 1, a guide cam 20 being so far stopped at the specified position of a guide taper surface 12b slides downward along the guide taper surface 12b while keeping its attitude of a rocking top dead point P2, and rides on a guide lower surface 12c whereby it keeps its attitude along in an insertion direction of the cassette 1. At this time, since a pressure lever is depressed to a lower part of the cassette via a guide arm 10, a pressure state of the paper by the pressure lever is thus set free.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention brings paper in a paper feed cassette into pressure contact with a paper feed means such as a paper feed roll in order to enable paper feeding into a copying machine. The present invention relates to a paper pressure device, and particularly to an improvement in a pressure/release guide mechanism for smoothly performing the pressure operation and pressure release operation of the paper pressure device as a cassette is attached and removed.

[Prior art]

Generally, a copying machine is formed with a cassette receiver (2) into which a paper feed cassette (1) is inserted, as shown in Figs. 1 and 2 (a) and (b). Receiving part (
2) When the cassette (1) is installed, the paper (4) in the cassette (1) is marked -1- on the paper feed roll (3), which serves as a paper feed means and is placed above the corresponding grid 1). UF
A paper pressure device (A) is provided to bring the paper into contact with each other.

Conventionally, this type of paper pressure device has a rotating shaft extending in the width direction at the back side of the cassette receiving part (2), as shown in FIGS. 1 and 2 (a, 1(b)). (5), and a pressurizing lever (6) having a cross section is fixed to the substantially central shaft of this rotating shaft (5), and the rotatable free end of this pressurizing lever (6) There is one in which the pressure lever (6) is opposed to the insertion direction (m) of the cassette (1) and is always biased upward by a pressure spring (not shown).

In this type, the two-phase pressure lever (6)
As shown in the figure and FIG. 2(b), when the cassette (1) is installed, it protrudes into the cassette (1) from the bottom wall hole (7) of the cassette (1) and attaches to the bottom wall of the cassette (1). The paper (4) is pressurized via a bottom plate (8) whose one end is pivotally supported, and the paper (4) is brought into pressure contact with the -11 paper feed roll (3).

However, in such a paper pressure device, since the pressure lever (6) is always urged upward by a pressure spring, the pressure cannot be applied before the cassette (1) is installed. As shown by the solid line in FIG. 2(a), the pressure lever (6) is held in a free position facing diagonally -L with respect to the insertion direction (m) of the cassette (1). 1) It is arranged so as to block the mounting nuvene. In this case, if the pressure lever (6) is in the free position when the cassette (1) is installed, the insertion side end wall of the cassette (1) will interfere with the pressure lever (6). Therefore, normally, in the process of inserting the cassette (1) into the cassette receiver (2), as shown in Fig. 2 (a).
As shown by solid lines and imaginary lines, the pressure lever (6)
is rotated downward by a predetermined angle α and once moved to the lower part of the cassette (1), and when the cassette (1) is completely installed, as shown in FIG. The pressure lever (6) must press the paper (4). On the other hand, when detaching from the grid 1, it is necessary to release the pressurized state of the paper (4) by the pressure lever (6).

In order to enable such pressurizing and releasing operations of the paper pressurizing device, a conventional paper pressurizing device (A+ is shown in FIGS. 1 and 3(a) and (b)) is used. The pressurization/release guide mechanism (G) is equipped with a pair of id arms (1) at both ends of the rotation shaft (5) of the application lever (6).
0) is fixed, and the free rotation end of the guide arm (10) is arranged to protrude from the pressure lever (6) to the entrance side of the cassette receiver (2), and the free rotation end of the guide arm (10) is fixed. The cassette (1) has guide rollers (11) pivoted thereon, and guide portions (12) of an equilateral shape, the upper side of which is longer than the lower side when viewed from the side, are bulged on both sides of the cassette (1). When installing or removing the cassette (1), the guide portion (12)
By sliding the guide roller (11) using both longitudinal sides and the bottom surface of the cassette (1) as the guide tapered surfaces (12a) (12b) and the guide bottom surface (12c), the cassette (1) can be applied via the guide arm (10). The movement of the pressure lever (6) is restricted. In addition, the code (131
is a pressure spring.

According to such a pressure/release guide mechanism, for example, when the cassette (1) is inserted into the cassette receiver (2), the guide roller (11) As shown by the solid line in the figure (al), the guide taper surface (
] After contacting the upper edge of 2a), the guide tapered surface α2
a), and as shown by the imaginary line in FIG. If the arm (10) is configured to rotate downward by a predetermined angle α from the position shown by the solid line in FIG. 3(a) to the position shown by the imaginary line, the pressure lever (6) Figure 2 (
The cassette (1) is pushed down to the lower part of the cassette (1) as shown by the imaginary line at al.

After this, the guide roller (11) slides along the lower guide surface (12c) for a while, or during this time, the guide arm (10) maintains the position shown by the imaginary line in FIG. 3(a). Therefore, the pressure lever (6) is also connected to the cassette (
1), and interference between the pressure lever (6) and the cassette (1) is avoided. When the guide roller (Iυ) gets over the lower guide surface (12c), the guide arm (10) is lifted by the urging force of the pressure spring (13), as shown in FIG. 8(b). As shown in Figure 2 (bl) (2, cassette (
The pressure lever (6) that has reached the bottom wall hole (71i) of 1) is lifted upward and pressurizes the paper (4) in the cassette (]).At this time, the guide roller (11) 3
As shown in Figure (b), it slides upward along the guide taber surface (12b) and stops at a predetermined position. In addition, when removing the frame H], the above guide roller (11
) or Guy I/stay on the tapered surface (+, zb)] direction -\slide, Guy], 'T- then ride (12c) Sea 1-
Since the pressurizing lever (6) is attached to the guide arm, [1
(The paper (4) is pushed down to the lower part of the cassette (1) via the pressure lever (6), and the pressurized state of the paper (4) by the pressure lever (6) is released. After that, the guide roller (1)
) is from the lower guide surface (12c) to the id tapered surface (12a
) and separates from the guide part (12). At this stage, the pressure lever (6) returns to the free position (second position) shown by the solid line in FIG. 2 (al).

By the way, in such a conventional pressure/release guide mechanism, when the cassette (1) is installed, as shown in FIG. When moving the guide arm (10) to the lower part of the cassette (10), the guide arm (10) must be rotated at the maximum rotation angle α. The guide roller (11) provided on the arm (10) is moved in the maximum direction of the guide arm (10) (in the range of 7+, the guide portion Q2+ is moved along the id tapered surface (12a). Therefore, the height dimension (h) of the guide portion (12) is set in accordance with the maximum vertical movement remaining (t). In order to prevent interference between the pressure lever (6) and the cassette (1), the length of the guide arm (10) is set between the rotation axis (5) and the free rotation end of the pressure lever (6). Since it is set longer than the length, "the maximum of the guide arm (10)" - the remaining downward movement (t+ is necessarily,
The pressure lever (6) is set to be quieter than that of the rotatable free end (t)' (see FIG. 2(a)). In this case, ``the maximum rotation free end of the pressurizing lever (6)'' minus the remaining downward movement (t)' is the cassette (1).
), the maximum of the guide arm (101) minus the remaining downward movement (t), in other words, the height dimension of the guide section (121 (t)).
hl greatly exceeds the paper storage capacity described in 1. Therefore, the height of the cassette (1) itself must be set larger than the paper storage capacity. ) itself becomes unnecessarily large, and the space inside the cassette receiving part (2) must also be larger than necessary. Such problems become more pronounced as the length of the guide arm (10) is increased to reduce the operating force required when attaching and detaching the cassette (1).

[Purpose of the invention]

This invention has been made from the following two points of view, and its objectives are to miniaturize the cassette and minimize the space of the cassette holder without complicating the mechanism itself. An object of the present invention is to provide a pressure/release guide mechanism in a paper pressure device of a copying machine that can be suppressed.

[Structure of the invention]

The basic structure of the present invention is that a guide arm is provided on the side of the cassette receiving part coaxially with a pressure lever for pressurizing paper, and the free rotation end of this guide arm is connected to the free rotation end of the pressure lever so that the cassette can be inserted into the cassette. Protrudingly placed on the inlet side of the receiving part,
The rotatable free end (2) of this guide arm protrudes from the rotatable free end toward the inlet side of the cassette receiver, supports the ID cam in a swingable manner, and serves as the bottom dead center of the guide cam in the cassette insertion direction. The cassette is provided with a guide portion having a predetermined guide locus on the side surface of the cassette, while giving the cassette a posture facing diagonally downward and giving a posture along the insertion direction of the cassette as one swing point of the guide cam, When attaching or detaching the cassette, the guide cam must be swung by the guide section (1).
Second, the L guide arm is rotated, and the pressure lever is temporarily moved to a lower part of the cassette via this guide arm, thereby performing a paper pressurizing operation and a pressurizing release operation. It is something.

〔Example〕

Hereinafter, the present invention will be described in detail based on the embodiments shown in the accompanying drawings.The same constituent parts as in the prior art will be given the same reference numerals as in the prior art, and detailed explanation thereof will be omitted here.

In the first embodiment shown in FIGS. 4 to 7, the pressure/release guide mechanism (Gl) in the paper application device is attached to both ends of the rotation shaft (5) of the pressure lever (6), as in the conventional case. The cassette (1) has a fixed guide arm (10) and guide parts (12) formed on both sides of the cassette (1). teeth,
1- Guide tapered surface (12aX1) of guide portion (12)
2b) and a guide cam (4)) that slides along the lower guide surface (], Zc) f1.

In this embodiment, the guide cam arm (20) has an elliptical cross section (-), as shown in FIGS. 5 and 6, and the guide cam (20) has its base end connected to the guide arm. (10) is pivotally supported by a shaft Q1) on the free rotation end of the guide arm (10), so that it can be freely swung downward (1-1) with respect to the guide arm (10), and the tip of the guide cam (20) is The movement range of the guide cam @ on the inlet side of the cassette receiver (two protrusions are arranged from the rotation free end of the guide arm (10)) is relative to the extension line (loa) of the guide arm (10). , a posture facing downward by a predetermined angle is defined as the swing bottom dead center (Pl), and a posture facing diagonally upward by a predetermined angle is defined as the swing top dead center (Pl), and the swing bottom dead center is defined as the swing bottom dead center (Pl). (Pl) is whatever rotational position the guide arm (10) is in.
The guide cam (20) is in the insertion direction (m) of the cassette (1)
The above-mentioned swinging top dead center (Pl) is set so that the guide arm (10) can take a diagonally downward position with respect to the guide cam. @) is set so that it can take a posture along the insertion direction (m) of the cassette (1). And furthermore, what is the swing range of the guide cam (20)? The regulating means is, for example, protrudingly provided on the -L edge of the guide arm (10) (on the stopper flange formed by two bends) and the proximal arcuate surface (20a) of the guide cam (20). Stopper protrusion (a)
The swing bottom dead center (P) of the guide cam (20) is
l) is regulated by bringing the stopper protrusion into contact with the stopper flange (a), while the guide cam (20)
The top dead center (Pl) of the swing is regulated by bringing the longitudinal edge of the stopper flange (A) into contact with the upper surface of the guide cam @).

Next, the operation of the pressure/release guide mechanism according to this embodiment will be described.

First, if we look at the case of guiding the pressurizing operation of the paper pressurizing device when the cassette (1) is installed, the cassette (1)
When the cassette (1) is inserted into the cassette receiver (2) (see Figure 1) during installation, the guide cam
As shown by the solid line in Figure (al), with the stable posture at the bottom dead center (Pl) of the guide section (the guide taper surface of 121)
, Za), the swinging bottom dead center (Pl)
While maintaining this posture, it rests on the guide tapered surface (12a) and slides downward, as shown by the imaginary line in Fig. 4 (a) (2. LZa) and insert the cassette (1) in the direction (m)
Maintain a posture that follows. In this case, the guide arm (10) moves as shown in FIG.
) is rotated downward by a predetermined angle from the position shown by the solid line to the position shown by the temporary line, but the pressure lever (6) changes the rotation angle of the guide arm from the free position to the cassette (
1) If the angle α (2) required to move to the lower part is set, the pressure lever (6) marked -Jl will be
) is pushed down to the lower part of the cassette (1), as shown in phantom lines. Thereafter, the guide cam (5) slides along the lower guide surface (12c) while maintaining its posture along the insertion direction (m) of the cassette (1).

At this time, the guide arm (10) in item 1 is as shown in Fig. 4(a).
Pressure lever (6) is held in the position shown by the imaginary line.
The lower part of the cassette (1) is also held to avoid interference between the pressure lever (6) and the cassette (1).And when the guide cam (4) crosses over the guide lower surface (12c), , as shown in Figure 4(b) (2) Due to the biasing force of the pressure spring (13) (2), the guide arm (10) is lifted, as shown in zta(b). , the pressure lever (6) that has reached the bottom wall hole (7) of the cassette (1) is lifted upward and pressurizes the paper (4) in the cassette (1) via the bottom plate (8). At this time, the guide cam (5) slides upward along the guide tapered surface (12b) while maintaining the swinging top dead center (Pl) attitude, as shown in FIG. 4 (bl). The paper (4) is pressed and then stopped at a predetermined position.This completes the pressurizing operation of the paper (4).

On the contrary, when guiding the processing release operation of the paper pressure device when the cassette (1) is removed, the -C stain is caused by the cassette holder (2) as shown by the arrow n in Figure 4 (b). When the cassette (1) is removed, it stops at a predetermined position on the guide tapered surface (12b), but the ID cam (support) continues to move on the guide tapered surface while maintaining the swinging top dead center (P2) attitude. (12b), slides downward, rides on the lower surface of the guide (12c), and maintains a posture along the insertion direction (m) of the cassette (1). At this time, press the pressure lever (
6) is pushed down to the lower part of the cassette (2) via the guide arm (10).
) will release the pressurized deafening of paper (4). After this, when the cassette (1) is further removed, L
The guide cam (2) slides on the guide lower surface (12c) while maintaining a 7θ tilted attitude in the insertion direction (m) of the cassette (1), and then slides over the guide lower surface (12c). Then, the guide arm (10) is lifted by the biasing force of the pressure spring (13), so the guide cam (2111) is moved onto the guide tapered surface (12a) while maintaining the swinging bottom dead center (Pl) posture. As it heals, it slides upward and finally separates from the guide part (12). At this stage, the pressure lever (6) returns to the free position shown by the solid line in FIG. 2(a). This completes the operation of releasing the pressure on the paper (4).

In such a guiding process, the guide arm -'-(
10) is designed to rotate downward at the maximum rotation angle (α) when the cassette (1) is attached, and at this time, the guide arm (10) shown in FIG. Assume that the rotation free end of the arm moves with a maximum of -1-downward moving type (t).In this case, when the guide arm (10) is at the most "1" position, the guide force (20) is oscillating. When the guide arm (10) is at the lowest position while maintaining the posture of the bottom dead center CP,), the guide cam (20) maintains the posture along the insertion direction (m) of the cassette (1). Therefore, the tip arc surface (20b) of the guide cam (20) has a maximum vertical movement (4) which is smaller than the maximum vertical movement (t) of the guide arm (10) described in 1.
) along the guide tapered surface (12a). Therefore, the height dimension (h
o) may be set corresponding to the maximum vertical movement C1o of the guide cam (3)). At this time, the maximum vertical movement (to) of the guide cam (4) is as follows:
Since it is smaller than that of the guide arm (10) (71), it approaches the paper storage capacity in the cassette (1), so the height dimension (ho) of the guide part (12)
It is possible to eliminate the situation where the paper storage capacity is unnecessarily exceeded by a large amount compared to the conventional case. Therefore, the cassette (1
) It is no longer necessary to unnecessarily increase the height of the cassette (1) itself beyond the allowable paper storage capacity.
2) It also becomes possible to narrow the space inside.

Furthermore, in this embodiment, the guide cam (20) maintains a dovetail force along the insertion direction (m) of the cassette (1) when sliding on the lower guide surface (12c) of the guide portion (12). When the cassette (1) is attached or removed, the situation where the guide cam (4)) becomes an external protrusion that unnecessarily protrudes from the bottom wall of the cassette (1) is avoided, and with the presence of the guide cam (support) There is no concern that the space inside the cassette receiving part (2) will become unnecessarily wide.

Next, a second embodiment shown in FIGS. 8N to 10 will be described.

The guide cam (G) according to this embodiment has an oval cross-section like the first embodiment, but unlike the first embodiment, it is longer than the guide cam (20) of the first embodiment. It has long sleeve dimensions, and the center part is attached to the guide arm (10).
It is pivotally supported at the free rotation end of.

A hook-shaped stopper piece 0]) is protruded from the upper edge of the guide arm (10) near the free rotation end, and this stopper piece 01) is attached to both longitudinal ends of the guide cam (G). By bringing the two opposite side surfaces into contact with each other, the swing range of the guide cam (G) is restricted. In this embodiment, the swing bottom dead center (Pl) of the guide cam (G)
As in the first embodiment, the insertion direction of the cassette (1) (
Although the guide cam (G) is set in an attitude diagonally downward with respect to the guide cam (G), the swinging top dead center (P2') of the guide cam (G) is located higher than that of the first embodiment (P2), cassette(
1) Insertion direction (m) (2) It is set in a posture diagonally toward the upper blade.

Therefore, according to this embodiment, in addition to achieving the same functions and effects as the first embodiment, it is also possible to set the height of the second cassette (1) smaller than in the first embodiment. That is, in the first embodiment, when pressurizing the paper, the base end side circular arc surface (20a) of the guide cam @) is at a position (
2, it comes into sliding contact with the guide taper (12b) of the guide portion Q2+. For this reason, the cassette (1) is secured by ensuring that the guide cup (@) and the guide part (121) are in a state of engagement.
In order to maintain good detachment workability, the height dimension (ho) of the guide section (1) is such that the rotating free end of the guide arm (10) can move downward by 142 degrees when pressurizing the paper. The stroke (So) must be set equal to or greater than (see Fig. 10).On the other hand, in this embodiment,
When pressurizing the paper, the guide cam (T) maintains the posture of the swing top dead center (P2'), so the one end side arcuate surface (80a) of the guide cam (T) l
The guide portion (12
) comes into sliding contact with the id tapered surface (12b). At this time, one end side circular arc surface (30a
) can move in the vertical direction when pressurizing the paper is smaller than the stroke (So) of the guide arm (10), so the height of the guide part (12) The dimensions (hl) are those of the first embodiment (
ha) may be set smaller than that of ha). Therefore, the height of the cassette (1) itself can be set smaller than that of the first embodiment.

In addition, in each of the above embodiments, the guide cam [20+, (
(g) are all constructed of a single piece with an oval cross-section, but they are not necessarily limited to this. For example, as shown in Figures 11 and 12, a plate-shaped base plate 0υ is constructed. For example, a pair of rollers Q2@3 that are pivotally supported may be used as the guide cam (at). In this case, since the roller 003 slides along the guide part (12), the guide cam (4CI) and the guide 1' part (1
The sliding resistance between the cassette (1) and the cassette (1) is lower than that of the embodiments described in 2 above, and the force required to attach and detach the cassette (1) is reduced accordingly. Further, the guide arm diameter and the guide portion +121 are not limited to those shown in each of the embodiments described in section 2, and may be modified in design as appropriate.

〔Effect of the invention〕

As explained above, according to the pressure/release guide mechanism in the paper pressure device of a copying machine according to the present invention, it is possible to make the guide path portion that is accompanied by pressure/release of paper in the cassette compact. Therefore, there is no need to unnecessarily increase the height of the guide part on the cassette side, and the cassette itself can be made smaller accordingly, and the space inside the cassette receiving part can be kept to the minimum necessary.

Furthermore, according to this invention, a guide cam is used in place of the guide roller used in the conventional pressure/release guide mechanism, so there is no concern that the mechanism itself will become unnecessarily complex. do not have.

[Brief explanation of the drawing]

FIG. 1 is an explanatory plan view showing an example of a paper pressure device of a conventional copying machine, and FIGS. Line sectional view, FIG. 8(a), (bl is I- in FIG. 1 showing the pressure/release guide mechanism in the conventional sheet pressure device; FIG. 2(a), (bit 2) shows the corresponding guiding process. I-line sectional view, Figure 4 (a
)(b) is a first embodiment of the pressure/release guide mechanism according to the present invention, and is a sectional view without showing the guiding process corresponding to FIG. 2(aHb), and FIG. 5 is a specific diagram of the guide cam. FIG. 4 (aHb) is an explanatory diagram of the main parts showing the configuration, FIG. 6 is a view taken from the direction of v1 in FIG. A main part explanatory diagram corresponding to FIG. 5 showing a second embodiment of the pressurization/release guide mechanism according to the present invention, and FIG.
Fig. 10 is an explanatory view of the main parts showing the operation of the pressure/release guide mechanism when pressurizing paper;
FIG. 1 is an explanatory view corresponding to FIG. 5 showing a modification of the guide cam, and FIG. 12 is a view taken from the direction of arrow X11 in FIG. 11. Symbol explanation A: Paper pressure device G: Pressure/release guide mechanism m: Cassette insertion direction P1: Bottom dead center of swing P2+ P2'...Rolling top dead center (1)...
...Cassette (2) ...Cassette holder (3)
...Paper feed roll (paper feed means) (4)...
・Paper (5)・River・Rotation axis (6)・・Applying lever (7)・River・・Hole (8)・・Bottom brake) +10+・・・・・・・・Guide arm (12)
...Guide part @) (g) (40) ...
Guide Cam Patent Applicant Fuji Xerox Co., Ltd. Agent Tomohiro Tsuchinaka Patent Attorney Katsuo Naruse Fig. 1/ Fig. 3 Fig. 5 Fig. 8 Fig. 9 Fig. T1 Fig. 12

Claims (1)

[Claims] A pressurizing lever is rotatably provided in a cassette receiving part of a copying machine into which a paper feed cassette is inserted and installed, and the rotatable free end of the pressurizing lever is opposed to the insertion direction of the cassette, and the pressurizing lever is attached. When the cassette is installed, it is constantly urged upward via the force means and the pressure/release guide mechanism is used.
The pressure lever is guided to the bottom wall hole of the cassette to pressurize the paper in the cassette, and the paper is brought into pressure contact with the paper feeding means disposed on one side of the cassette, while when the cassette is removed, In the paper pressurizing device of the copying machine, the paper pressurizing device is configured to release the pressurizing state of the paper by the pressurizing lever, and the pressurizing lever is provided on the side of the cassette receiving part coaxially with the pressurizing lever, and the rotatable free end of the pressurizing lever is provided. A guide arm is arranged to protrude toward the entrance side of the cassette receiver, and a rotatable free end of this guide arm is arranged to protrude toward the entrance side of the cassette receiver, and swings in a posture diagonally downward with respect to the insertion direction of the cassette. With the bottom dead center and the position along the insertion direction of the cassette as one swing point, the guide arm is pivotably supported on the rotatable free end of the guide arm, and a predetermined guide is attached to the side of the cassette. and a guide section provided with a trajectory so that when the cassette is attached or removed, the guide cam slides along the guide trajectory and temporarily moves the pressure lever to a lower part of the cassette via the guide arm. Pressure/release guide mechanism in the paper pressure device of a copying machine.