JPH0391766A - Image forming device - Google Patents

Abstract

PURPOSE:To hold up an upper part main body with a large force when opened by providing on one edge of an arm a rotating member in a position where internal stress of the material constructing a spring energizing means becomes great when the upper part main body is opened CONSTITUTION:When a handle 4 is pushed down in a direction of an arrow A with a supporting point 11 as the center, the first cam 5 and the second cam 6 are rotated in the direction of the arrow A integrally with the handle 4. At this time, because the first cam 5 is abutted to the lower edge part of the second arms 9a and 9b, it is rotated in a direction of an arrow B with an attaching fulcrum 21 as the center. Further, the second cam 6 is also rotated in a direction of an arrow C with the supporting point 11 as the center and one edge of a first hook releasing member 12 which is connected to the second cam 6 is traveled in the direction of the arrow C. The second hook releasing member 13, which is pulled to the right direction at the other edge of the first hook releasing member 12, is rotated in a direction of an arrow D with a fulcrum 15 as a center. A tip of a hook 17 where the second hook releasing member 13 is abutted is pushed and the hook is taken off from a hole 16, and the upper part main body 1 is opened.

Description

[Detailed Description of the Invention] The present invention is a printer and a facsimile machine. The present invention relates to an image forming apparatus such as a copying machine, and more particularly to a clamshell type image forming apparatus that can be opened and closed.

2. Description of the Related Art Taram shell type image forming apparatuses have been widely known. This type of image forming apparatus has an upper main body that opens across the paper transport path so that jam removal and inspection of the inside of the main body can be easily performed. In the above-mentioned jam processing, etc., the 1000 steps (hereinafter referred to as "shell open holding means J") that hold the upper body in an open state include those using an air damper, those using a toshigon bar, those using a helical spring, etc. It has been known.

! ! The shell opening holding means using a torsion bar or a spiral spring is cheaper than one using an air damper. In this state, a large internal stress occurs in the torsion bar and the helical spring.This internal stress causes the torsion bar to deform over time, and as a result, the spring action due to the internal stress decreases, so when opening the upper body, The force may become weak and the upper body may not be opened to a predetermined angle, or the upper body may close inadvertently during jam removal.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems and provide a clamshell type image forming apparatus that can reliably obtain a predetermined opening state of the upper main body and stably maintain that state. be.

In order to achieve the above object, the image forming apparatus of the present invention includes an upper main body, a lower main body, a first arm that contacts the upper main body at its end, and a first arm that contacts the lower main body at its end. a clamshell type image forming apparatus, comprising a spring biasing means having a second arm in contact with the spring biasing means, and in which the upper body opens to the lower body by a spring action due to internal stress of a material constituting the spring biasing means. When opening the upper body from the closed state with respect to the lower body, the end of the first arm or the second arm is positioned at a position where the internal stress of the material constituting the spring biasing means becomes large. The configuration includes a rotating member to be driven.

Furthermore, locking means is provided for keeping the upper body in a closed state with respect to the lower body, and locking release is provided for releasing the locking means by rotation of the rotating member when the upper body is opened. A member may be provided.

According to this configuration, when the upper body is opened from a closed state, the upper body is subjected to a large spring action due to the internal stress of the material constituting the spring biasing means, so that the upper body is sufficiently be lifted up.

Further, the open state is sufficiently maintained. In the closed state, internal stress is small, and changes over time are correspondingly small.

Furthermore, if the upper body is kept in a closed state with respect to the lower body by the locking means, and the lock release member releases the locking means by rotation of the rotating member when opening the upper body. , the closed state becomes more stable, and the locking means can be released and the rotating member can be rotated at the same time. Embodiments of the present invention will now be described based on the drawings. As shown in FIG.
), the lower body (2), and torsion bars (7a) (7b) which are spring biasing means.

This toshi tambour (7a) (7b) is the upper main body (
1) is inserted into a cylindrical mounting fulcrum (21) provided for opening the opening, and is bent at both ends of the mounting fulcrum (21) as shown in FIG. 1
Arm (8a) (8b) and second arm (9a) (
9b). In addition, in Fig. 3, the upper body (1)
The torsion bars (7a) (7b) and the mounting fulcrum (21) are shown before being attached to the lower body (2). Figure 1 shows torsion bars (7a) (7b) and mounting fulcrums (21) on the upper body (1) and lower body (2).
) is shown attached, and the first arm (8
a) (8b) is the copying machine case (3) of the upper body (1).
Abutting at the end with the abutting plate (10) provided in a),
The second arm (9a) (9b) is a first cam (5) that is rotatably provided around the fulcrum (11) of the lower body (2).
) is in contact with the end.

At this time, the torsion bars (7a) (7b) are biased against the abutment plate (10) by the first arms (8a) (8b), and at the same time, the torsion bars (7a) (7b) are biased against the abutment plate (10) by the second arms (9a) (9b). (5) is biased. In addition, in FIGS. 1 and 2, the first arm (8b) and the second arm (9a
) are the first arm (8a) and the second arm (9
It is not shown because it is in the shadow of b). Furthermore, although the second cam that comes into contact with the second arm (9a) is not shown, it is provided at the fulcrum (11) similarly to the first cam (5).

First cam (5). The second cam (6>) and the handle (4) are rotatably provided as a unit around the fulcrum (1l) of the copying machine case (3b) of the lower main body (2).The first cam ( 5) protrudes with its tip pointing in the longitudinal direction of the handle (4), and the second cam (6) protrudes with its tip pointing perpendicularly to the first cam (5). Cam (6
) is connected to one end of the first hook release member (12) by a free fulcrum (14a). This first
The other end of the hook release member (l2) is connected to one end of the second hook release member (13) by an unfixed fulcrum (14b). The second hook release member (13) is rotatable around the fulcrum (15), and the upper body (
1), the other end of which can come into contact with the tip of a hook (17) rotatably provided around a fulcrum (19). A bottle (18) is fixed to the copying machine case (3a) of the upper body (1), and the hook (17) is biased toward the bottle (1B) by a spring (20). The tip of the hook (17) is inserted into a hole (16) penetrating the side surface of the copying machine case (3b) of the lower body (2). In this example, two torsion bars (7a) and (7b) are used, but one or three or more torsion bars may be used depending on the strength of the spring action due to the internal stress of the material that makes up the torsion bars. A torsion bar may also be used. Furthermore, instead of the torsion bars (7a) (7b), a helical spring (22) shown in FIG. 4 can be used as the spring biasing means. As shown in the figure,
Since this helical spring (22) is provided with a first arm (8c) and a second arm (9c), it can act in the same manner as the toshigon bars (7a) (7b).

Further, instead of the first cam (5), a disc-shaped eccentric cam having a perfectly circular side surface or the like may be used.

Next, the opening/closing operation of the upper body (1) with respect to the lower body (2) will be explained.

First, as shown in FIG. 1, when the upper body (1) is closed to the lower body (2), the hook (1)
The tip of 7) is locked in the hole (16). That is,
The closed state shown in FIG. 1 is maintained by the hook (17) and hole (16), which are locking means. When the handle (4) is tilted in the direction of the arrow (A) about the fulcrum (1l), the first cam (5) and the second cam (6) also move together with the handle (4) in the direction of the arrow (A) as described above. Rotate to. At this time, the first cam (5) is in contact with the lower end of the second arm (9a) (9b), so it rotates in the direction of arrow (B) (Fig. 1) about the mounting fulcrum (21). do. 1st cam (
5) and the center of the fulcrum (l1) is perpendicular to the second arm (9b), the second arm (9b)
Although the amount of movement in b) is the largest, it is also possible to further tilt the handle (4) and rotate the first cam (5) to the position shown in FIG. 2. Further, as shown in FIG. 1, the second cam (6) also rotates in the direction of arrow (C) about the fulcrum (11), and the first hook release member ( Move one end of l2) in the direction of arrow (C). The second hook release member (13) pulled to the right by the other end of the first hook release member (12) rotates in the direction of arrow (D) (FIG. 1) about the fulcrum (t5). As shown in Figure 1, the tip of the hook (17) in contact with the second hook release member (13) is pushed and removed from the hole (16), and the upper body (1>) opens as shown in Figure 2. do.

The hook (l7) comes out of the hole (16) before the handle (4) is brought down to the position shown in Figure 2, but the second arm (9a)
(9b) moves as described above. Due to the torsional torque of the toshigon bars (7a) (7b) corresponding to the amount of movement at this time, the upper body (1) opens relative to the lower body (2) as shown in FIG. 2.

In the above embodiment, the contact position of the second arms (9a) (9b) with respect to the lower body (2) is changed between the closed state and the open state; By changing the contact positions of the arms (8a) and (8b), the force exerted on the upper body (1) at the entrance may be increased.

As described above, according to the present invention, when the upper body is opened from the lower body from the closed state, the spring biasing means is located at a position where the internal stress of the material constituting the material becomes large. Since one end of the first arm or the second arm is driven by the rotation of the rotating member, the upper body can be lifted with a large force when opened, while when it is closed, a large force is applied to the spring biasing means. It is possible to reduce the internal stress caused by Therefore, the predetermined open state of the upper body can be stably achieved and maintained.

Further, a locking means for locking the upper body in the closed state of the upper body may be provided, and a locking release member may be provided for releasing the locking means by rotation of the rotating member when the upper body is opened. This makes the operation even easier.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing the upper body in a closed state relative to the lower body in an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view showing the open state. FIG. 3 is a perspective view for explaining a torsion bar used as a spring biasing means in the above embodiment, and FIG. 4 is a perspective view showing a helical spring used as another spring biasing means. be. (1) - Upper body, (2) - Lower body,
(5)・First cam. (6) First and second cams (7a)
(7b) --- }-Shonbar (8a) (8b
)-11 first arm, (9a) (9b)...1 second arm, (12)--first hook release member 2 (l3) second hook release member. (16) ノ\1 (Work 7) Hook. Patent applicant Sanda Kogyo Co., Ltd. Figure 3 Figure 4

Claims (2)

[Claims] (1) A spring biasing means comprising an upper body, a lower body, a first arm abutting the upper body at an end, and a second arm abutting the lower body at an end; In a clamshell type image forming apparatus in which the upper body opens with respect to the lower body by a spring action due to internal stress of a material constituting the means, when the upper body is opened from the closed state with respect to the lower body. An image forming apparatus characterized in that a rotating member for driving an end of the first arm or the second arm is provided at a position where the internal stress of the material constituting the spring biasing means becomes large. (2) Further, a locking means is provided for maintaining the upper body in a closed state with respect to the lower body, and the locking means is released by rotation of the rotating member when the upper body is opened. The image forming apparatus according to claim 1, further comprising a lock release member.