JPH0734440Y2 - Image forming device opening / closing mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an opening / closing mechanism of an image forming apparatus, and more specifically, an upper frame body is pivotally supported on a lower frame body, and an upper frame body and a lower frame body are provided. The present invention relates to an opening / closing mechanism of an image forming apparatus having a cushioning means near the open end of the.

[Conventional technology]

Conventionally, as shown in FIG. 5, a large clamshell type copying machine comprising a lower frame body 1 and an upper frame body 2 which is rotatably supported by the lower frame body 1 has been constructed by using both the frame bodies 1 and 2 as described above. Two springs 14 with elasticity on the front side and the opposite side at the open end of
14 are provided, and due to the elasticity of the two springs 14 and 14, when the upper frame 2 is opened by hand, the load on the heavy upper frame 2 is reduced, and the upper frame 2 is opened. I was supporting the state.

Further, when the upper frame 2 is closed against the springs 14 and 14, the upper frames 2 of the springs 14 and 14 are attached to the lower frame 1
The heavy upper frame 2 absorbs and absorbs the impact generated by collision with the
It was designed to prevent equipment damage or failure due to useless impact.

[Problems to be solved by the invention] However, considering the workability at the time of maintenance such as paper jam, the conventional copying machine having two springs 14
There was a problem that the workability was poor because the spring 14 on the front side was an obstacle.

The present invention aims to solve such problems.

[Means for Solving the Problems]

To achieve the above object, the present invention provides the following opening / closing mechanism of an image forming apparatus.

That is, the present invention rotatably supports the upper frame body on the lower frame body, and at the open end side thereof, a cushioning means is provided to alleviate a shock caused by a collision with the lower frame body when closing the upper frame body. An opening / closing mechanism of the image forming apparatus, wherein the cushioning means is an elastic means provided on a front side lower frame body at the open end, and an extendable support provided across an upper frame body and a lower frame body on the opposite side. And an opening / closing mechanism of the image forming apparatus.

[Action]

In the above structure, the supporting means acts to reduce the load of the operation of opening the upper frame.

When the upper frame is opened, the upper frame is supported by the support means on the opposite side of the open end.

When closing the upper frame, the elastic means on the front side and the supporting means on the opposite side form a well-balanced cushion to absorb the shock between the upper and lower frame bodies.

〔Example〕

With respect to the embodiments of the present invention, how the structure of the present invention is practically embodied will be described below with reference to the drawings.

FIG. 1 is a schematic explanatory view of an embodiment of the present invention, in which FIG.
Is a lower frame of the image forming apparatus, and an upper frame 2 is rotatably supported by a support shaft 3 on the lower frame 1.

A conveyance path 4 for sheet deletion is provided between the two frame bodies 1 and 2.

The lower frame 1 is provided with a transfer device 6, a conveyance device 7, a fixing device 8, a discharge roller 9 and the like in addition to the paper feed cassettes 5 being detachably attached.

The upper frame 2 is centered on the photosensitive drum 10,
Optical system 11, developing device 12, cleaning device 18, charging device
19 etc. are installed.

The upper frame body 2 can be opened with respect to the lower frame body 1 along a sheet conveyance path 4.

Upper frame 2 pivotally supported on the lower frame 1 by the support shaft 3
Holds the open state by supporting the side opposite to the open end, which is the left side of the figure, with a stretchable gas spring 14 as a support means provided over the rod-shaped upper frame 2 and lower frame 1.

Also, the front side of the lower frame 1 side, that is, the side on which the creator stands (first
A compression spring 15 as an elastic means is provided on the front side in the direction perpendicular to the paper surface in the figure), and a projection 15a corresponding to the upper frame 2 side is provided.
By providing the above, when the upper frame body 2 is unlocked from the locked state described later, the restoring force of the compression spring 15 pushes up the upper frame body 2 via the protrusion 15a, so that the upper frame body 2 can be easily opened. To do.

The gas spring 14 is an elastic member having a long stroke that utilizes the elasticity of compressed air, and the long stroke exerts its elasticity on the upper frame body 2 in the entire region from the closed state to the opened state. The compression spring 15
Is an elastic member having a short stroke, and exerts elasticity on the upper frame body 2 only when the upper frame body 2 is closed and opened, that is, when the upper frame body 2 at the open end approaches the lower frame body 1. .

FIG. 2 is an enlarged view of a main part of the embodiment, in which the compression spring 15 embedded in the lower frame 1 side and the projection 15a attached in the upper frame 2 side are shown correspondingly.

FIG. 3 is an operation explanatory view of the main part, and shows a state of the compression spring 15 on the lower frame 1 side when the upper frame 2 is pressed against the spring.

In this state, the compression spring 15 stores a restoring force by being compressed.

FIG. 4 is a perspective view of the embodiment, in which the gas spring 14 supporting the upper frame 2 in an open state is provided on the left side, and the compression spring 15 is provided on the left front side.

Since the gas springs 14 are removed from the conventional two to eliminate the gas springs on the front side, the work is easy at the time of maintenance work or paper jam.

Further, since the compression spring 15 is provided on the front side instead of the removed gas spring, when the upper frame 2 is pressed and closed by hand, the gas spring 14 on the opposite side and the compression spring 15 on the front side It can be closed by receiving the pressing force in good balance.

Even after it is closed, the upper frame body 2 can be held in a well-balanced manner through the locking means described later.

That is, the gas spring 14 and the compression spring 15 are buffer means.
Make up 16.

Further, there is a locking means 17 on the front and rear of the left side of this figure, and this locking means 17 is composed of a locking hole 17a on the lower frame 1 side and a locking hook 17b on the upper frame 2 side. .

The locking hooks 17b of the upper frame 2 are configured to move simultaneously by a connecting rod 17c and are urged in a direction in which they are locked by a normal urging member 17c such as a coil spring (not shown). By closing 2, the frame 2 is automatically locked.

This locked state is interlocked with the operation of manually opening the upper frame 2, and is released against the bias.

The compression spring 15 of the above embodiment may be replaced by an elastic member such as a sponge as the elastic means. Further, as the supporting means, a gas damper may be used instead of the gas spring 14.

As described above with reference to the embodiments, the opening / closing mechanism of the present invention comprises the buffer means 16 including the gas spring 14 and the compression spring 15.
Since it is equipped with a spring, it is easy to work during maintenance and paper jams, and when closing the upper frame 2, the spring 14
A well-balanced cushioning means 16 is constituted by the compression spring 15 and the compression spring 15. By this, even if the left front side of the upper frame 2 is pressed, twisting does not occur at the time of closing, locking is performed properly, and closing is performed. By relaxing the impact of the upper and lower frames at this time, it is possible to prevent damage or failure of the device.

[Effect of device]

According to the present invention as described above, since the buffer means is constituted by the supporting means provided over the upper frame body and the lower frame body and the elastic means provided on the lower frame body, the supporting means for supporting the opened upper frame body is one. Books are all that is needed and therefore maintenance is easy.

Further, since the cushioning means is composed of the supporting means and the elastic means, it becomes a well-balanced cushion when the upper frame is closed, and it is possible to absorb the shock associated with opening and closing and prevent damage or failure of the image forming apparatus. effective.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of an embodiment of the present invention, FIG. 2 is an enlarged view of a main part of the same embodiment, FIG. 3 is an operation explanatory view of the main part, and FIG.
FIG. 5 is a perspective view of the same embodiment, and FIG. 5 is an explanatory view of a conventional example. 1 ... Lower frame, 2 ... Upper frame, 14 ... Gas spring (supporting means), 15 ... Compression spring (elastic means), 16 ... Buffering means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Ikuichi Kitagawa 1-2-2 Tamatsukuri, Chuo-ku, Osaka City, Osaka Prefecture Mita Industry Co., Ltd. No. 28 Within Mita Industry Co., Ltd. (56) References: Kaihei Hei 1-128256 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A cushioning means for axially supporting an upper frame to be opened and closed with respect to a lower frame, and at its open end side, cushioning means for cushioning a shock caused by a collision with the lower frame when closing the upper frame. An opening / closing mechanism of the image forming apparatus, wherein the cushioning means is an elastic means provided on a front side lower frame body at the open end, and an extendable support provided across an upper frame body and a lower frame body on the opposite side. An opening / closing mechanism of the image forming apparatus, which comprises: