JPH0637419Y2 - Misoperation prevention mechanism for copiers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an erroneous operation prevention mechanism for a copying machine.

[Conventional technology]

A bracket is attached to the front side plate facing the openable and closable front cover provided in the copying machine case, and a safety switch is provided on the bracket, while a projection for operating the safety switch is provided on the front cover in a protruding manner. The safety switch is configured to be opened and closed by opening and closing the front cover, and an erroneous operation prevention mechanism is provided between the frame of the copy paper transporting device and the front cover to keep the copy paper transport path open. Copiers which are constructed such that the cover cannot be closed are already known.

In the above copying machine, when the front cover is opened, the safety switch automatically operates and shuts off the electric system.
It is possible to safely perform work such as moving the frame of the copy paper transport device in the vertical direction to open the transport path formed by the pair of upper and lower rollers and removing the copy paper jammed in the transport path.

[Problems to be solved by the invention]

However, in a conventional copying machine, a safety device including a safety switch and a projection for operating the safety switch and an erroneous operation preventing mechanism that prevents the front cover from being closed when the transport path is open are separately provided. As a result, the number of parts is increased, and a separately configured mechanism is incorporated into the copying machine, so that the assembly work is troublesome and the cost is high.

Further, since there is a space required between the front cover and the front side plate to provide a safety switch and a protrusion for operating the safety switch, the copy sheet conveying device is located further inside the front side plate, so that the copy sheet conveying device can be conveyed. The distance between the device and the front cover is usually quite large. Therefore, for example, while the protrusion is provided on the back surface of the front cover, the frame of the copy sheet conveying device is positioned inside and outside the movement path of the protrusion by opening and closing the conveyance path. If a contact part that can be switched to and is provided so that the protrusion cannot contact the contact part to close the front cover when the transport path is open, a significantly longer protrusion is required. Therefore, when the front cover is opened, the long protrusions become obstacles for paper jam handling work and the like.

An object of the present invention is to eliminate these problems in the conventional example.

[Means for solving problems]

The technical means taken by the present invention to achieve the above object are as follows. That is, the feature of the present invention is that the bracket is attached to the front side plate facing the openable and closable front cover provided on the copying machine case, and the safety switch is provided on the bracket while the safety switch is operated on the front cover. In a copying machine configured to project and project the protruding portion of the front cover and to open and close the front cover to operate the safety switch, a front and rear shaft body that penetrates the front side plate is reciprocated in the axial direction in the bracket. Provided in a movable and forwardly biased state, a shaft operation portion for pushing and moving the shaft against the biasing force is formed on the protrusion, and the shaft operating portion is provided inside the front plate. The frame of the copy paper transporting device provided is provided with a contact portion that can be switched between a state in which the shaft is located inside the moving path and a state in which the shaft is located outside the moving path by opening and closing the transport path. Located in.

[Action]

According to the above configuration, by opening the front cover,
Since the protruding part separates from the safety switch, the safety switch is automatically turned off and the electric system is cut off.

Further, by opening the front cover, the shaft operating portion formed on the protrusion is separated from the shaft, so that the shaft moves forward due to its urging force. In this state, the frame of the copy paper transporting device can be moved in the vertical direction to open the transporting path, and the paper jam can be easily handled.

When the transport path is opened, the transport path must be closed beforehand, that is, the frame of the copy paper transport device must be returned to its original position.
When closing the front cover, even if the shaft operating portion formed on the protrusion tries to push the shaft against the biasing force, the tip of the shaft contacts the contact part of the frame, so Can't close. Therefore, there is no risk of erroneous operation such as performing the copying operation by closing the front cover with the transport path open.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the appearance of a shell type electrostatographic copying machine capable of performing double-sided copying, and FIG. 2 shows the outline of the internal structure of the copying machine. The copying machine case 1 is divided into upper and lower parts, and the upper case 2 is pivotally connected to the lower case 3 so as to swing and open about a horizontal axis. Upper case 2 and lower case 3
Front covers 2a, 3a pivotally supported in the front-rear direction by swinging in the front-back direction are provided on the respective lower sides.

The upper case 2 is provided with an exposure device 4 that moves the platen, a photoconductor 5, a developing device 6, a cleaning device 7, and the like. When the upper case 2 is opened, these parts are also lifted upward. It is designed to be used.

The lower case 3 includes a transfer device 9 and a separating device 10 facing the photoconductor 5, and a paper feeding / conveying device 12 for feeding the copy paper sent from the paper feeding cassettes 11a and 11b to the transfer device 9.
And a paper discharging and conveying device 16 for discharging the copy paper after transfer / separation from the fixing device 13 to a paper discharging tray 15 through a pair of upper and lower paper discharging rollers 14a and 14b, and a double-sided copy for performing double-sided copying if necessary. A copying mechanism 17 is provided. The double-sided copying mechanism 17
A reversing mechanism unit 18 for reversing the conveying direction of the copy paper after completion of the one-sided copying via the fixing device 13, a copy paper conveying device 20 for conveying the reversed copy paper to the intermediate tray 19, and a temporary operation for the intermediate tray 19. The re-feeding mechanism unit 21 for re-feeding the stocked copy paper to the transfer device 9.

This embodiment is characterized in that the following misoperation preventing mechanism A is provided in the shell type copying machine having the above-mentioned structure.

The structure of the erroneous operation prevention mechanism A is as follows.

As shown in FIGS. 3 to 7, the front side plate on the lower case 3 side
22 is a plan view The bracket 23 forming a mold is fixed with a screw, and the bracket 23
Includes a safety switch S ₁ that is opened and closed by opening and closing the front cover 3a of the lower case 3, and a safety switch S ₁ that is opened and closed by opening and closing the front cover 2a of the upper case 2 or the upper case 2. ₂ and are provided. 23a is a mounting portion of the safety switch S _1, S ₂ formed on the bracket 23. The front cover 3a of the lower case 3 is provided with a protrusion 24 for operating the safety switch S _1, and the front cover 2a of the upper case 2 is provided with a protrusion 25 for operating the safety switch S _2.
Is projected.

The bracket 23 is provided with a shaft member 26 in the front-rear direction penetrating the front side plate 22 in a state of being movable in the axial direction and biased to move forward, and the protrusion 24 of the front cover 3a described above. A shaft body manipulating portion 27 for pushing and moving the shaft body 26 against the urging force is formed therein.

That is, as shown in FIG. 3 and FIG. 4, inside the bracket 23, a movable member 28 having a substantially L shape in plan view is provided.
Is supported so as to be reciprocally movable in the front-rear direction within the interchange range of the long hole 29 formed in the bracket 23 and the headed bolt 30 protruding from the side surface of the movable member 28, and is supported at the inner end of the movable member 28. The bent portion 28a is formed. A front end portion of the shaft body 26 is fixed to the bent portion 28a, and a compression spring 31 is provided between the front side plate 22 and the bent portion 28a in a state of being fitted to the shaft body 26. ing. 22 in FIG.
a is a through hole formed in the front side plate 22. Bracket 23
The front end of the through hole has a size that allows the protrusion 24 to be inserted therethrough.
32 is formed, and in the portion of the movable member 28 located between the safety switch S ₁ and the through hole 32, the tip of the protrusion 24 is formed.
A small through hole 33 is formed so that only 24a can be inserted.

As shown in FIG. 8, the frame 20a that pivotally supports the lower rollers 34a ... Of the copy paper transporting device 20 is configured to be swingable in the vertical direction around the support shaft 35, and by swinging the frame 20a, The transport path a formed by the upper rollers 34b and the lower rollers 34a is opened and closed. That is, when a paper jam occurs in the transport path a, the frame 20a can be swung downward to open the transport path a.

The frame 20a is provided with a contact portion 36 that can be switched between a state in which the shaft body 26 is positioned inside the moving path and a state in which the shaft body 26 is positioned outside the moving path by opening and closing the transport path a.

Next, the operation of the erroneous operation preventing mechanism A having the above configuration will be described.

As shown in FIG. 4, a few front covers 2a of the upper and lower cases,
When 3a is closed, the projection 25 of the front cover 2a holds the safety switch S _{2 in the} on state. The shaft body operating portion 27 formed on the protrusion 24 of the front cover 3a of the lower case 3 is in a state of pressing the shaft body 26 via the movable member 28, and the tip end portion of the shaft body 26 is located inside the front side plate 22. It greatly projects to. The tip 24a of the protrusion 24 is inserted into the safety switch S ₁ through the through hole 33, and the safety switch S ₁ is the tip of the protrusion 24.
It is kept in a closed state by 24a.

As shown in FIG. 5, when the front cover 3a of the lower case 3 is opened, the pressing state of the safety switch S ₁ by the tip portion 24a of the protrusion 24 is released, so that the safety switch S ₁ is turned off and the electric system is cut off. To be done. At the same time, the pressing state of the movable member 28 by the shaft body operating portion 27 of the protrusion 24 is released, so that the shaft body 26 moves forward by the biasing force of the compression spring 31.

In this state, since the tip of the shaft 26 is moved forward of the contact portion 36, the frame 20a of the copy paper transporting device 20 can be swung downward to open the transport path a. it can. By opening the transport path a, the frame 20a
Since the contact portion 36 provided in the inside of the shaft enters the moving path of the shaft body 26, the front cover 3a cannot be closed unless the transport path a is closed. That is, as shown in FIG. 6, even if the front cover 3a is closed, the protrusion 24 of the front cover 3a is closed.
Before the tip 24a of the shaft hits the safety switch S ₁ , the shaft operating portion 27 contacts the movable member 28, and the tip of the shaft 26 hits the contact portion 36
Since the front cover 3a cannot be closed, it is possible to prevent an erroneous operation such as closing the front cover 3a with the conveyance path a left open.

Note that the safety switches S ₁ and S ₂ are connected in series with each other, and the electric system is cut off by cutting one of them. Further, the safety switch S ₂ can be turned off by opening either the upper case 2 or the front cover 2a. That is, when only the open front cover 2a, as shown by the solid line in FIG. 7, the protrusion 25 is swung to the fulcrum around the front cover 2a, expired safety switch S _2, front cover
Even in a state closing the 2a, by opening the upper case 2, as indicated by one-dot chain line in FIG. 7, expired safety switch S ₂ since the protrusion 25 is increased, safety in either case can be secured Will be.

In the above embodiment, the present invention has been described by taking the shell type copying machine capable of performing double-sided copying as an example, but the present invention can be similarly applied to a copying machine performing single-sided copying.
The copy sheet conveying device that can open and close the conveyance path a in the present invention is not limited to the device that conveys the copy sheet after the conveyance direction is reversed to the intermediate tray 19.

[Effect of device]

Since the present invention has the above-mentioned configuration, the following effects can be obtained.

The safety switch bracket, which is operated by opening and closing the front cover, is provided with a front and rear shaft that penetrates the front plate in the axially movable and forwardly biased state. A shaft operation portion for pushing and moving the shaft body against the urging force is formed on the switch operating protrusion, and the frame is provided on the inside of the front side plate of the copy paper conveying device. By providing a contact portion that can be switched between a state in which the shaft is located inside the moving path and a state in which the shaft is located outside the moving path by opening and closing the path, the bracket and the projection can be opened by opening the front cover. It is shared by a safety device that turns off the safety switch to cut off the electrical system, and an erroneous operation prevention mechanism that prevents the front cover from closing if the transport path is open. , The improvement of the assembling workability, it is possible that these by cost.

The bracket attached to the front plate is provided with a shaft that penetrates the front plate, and this shaft is configured to be pushed and moved by the shaft operating portion formed on the protrusion of the front cover, so the protrusion of the front cover is short. If you need something and open the front cover,
There is no risk that the protrusion will interfere with paper jam processing work.

[Brief description of drawings]

1 to 8 show an embodiment of the present invention, FIG. 1 is a perspective view showing the outer appearance of a shell type electrostatographic copying machine capable of performing double-sided copying, and FIG. 2 is the copying machine. 3 is a schematic sectional view showing the outline of the internal structure of FIG. 3, FIG. 3 is a partially cutaway perspective view of the erroneous operation preventing mechanism, FIGS. 4 to 7 are sectional views for explaining the operation of the erroneous operation preventing mechanism, and FIG. 8 is a copy. It is a principal part side view of a paper conveyance device. A: erroneous operation prevention mechanism, a: transport path, S _1: safety switch, 1 ... copier case, 3a ... front cover, 20 ... copy paper transport device, 20a ... frame, 22 ... front Side plate, 24 ... Projection, 26 ... Shaft, 27 ... Shaft operating part, 36 ... Contact part.

Claims (1)

[Scope of utility model registration request] Claims: 1. A bracket is attached to a front side plate facing an openable and closable front cover provided in a copying machine case, and a safety switch is provided on the bracket, while a protrusion for operating the safety switch is provided on the front cover. In a copying machine configured to project and project the safety switch by opening and closing the front cover, a front and rear shaft body that penetrates the front plate is reciprocally movable in the axial direction in the bracket. Further, provided in a state in which the shaft is moved and biased forward, a shaft body operating portion for pushing and moving the shaft body against the biasing force is formed on the protrusion, and the shaft operating portion is provided inside the front side plate. The frame of the copy sheet conveying device is provided with a contact portion that can be switched between a state in which the shaft is located inside the moving path and a state in which the shaft is located outside the moving path by opening and closing the path. Error prevention mechanism of the copying machine according to symptoms.