JPH0342582Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) The present invention relates to the recovery of a defective key on the operation board of a copying machine, etc., and in particular, when the most frequently used key, in the case of a copying machine, the print key fails. It concerns a key structure that can be dealt with quickly.

(Prior Art) Among the complaints about copying machines, there are many complaints regarding the operating boat, and most of the causes are malfunctions in the key switch. Among these, the most frequently used and easily damaged printed keys are the ones that are most likely to be defective. The print keys of conventional operation boards are laid out in such a way that one key top corresponds to one key switch (a key is composed of a key top and a key switch). This layout improves the reliability of the switch and is advantageous in terms of cost. However, there are many cases where the switch malfunctions due to rough handling by the user or due to dust, etc., resulting in complaints.

In recent years, copying machines have become multi-functional, and special mode keys (variable magnification, interrupt, edit, duplex, ADF, sorter, etc.) have been added to the operation board, and the control section has become more complex, making the operation board unit more expensive. I'm getting used to it. Some parts are expensive and cost 40,000 to 50,000 yen. On the other hand, the parts cost for one key switch ranges from several 10 yen to less than 100 yen. Therefore, if the print key becomes defective, it can lead to fatal complaints about not being able to make copies, which not only causes unfavorable reviews from users but also damages the image of the manufacturer. Tatsuta 1
Even if a single switch is defective, the unit must be replaced, resulting in expensive repairs (several hundred thousand yen).

FIG. 2a is a longitudinal sectional view of a key structure according to a conventional example;
b is a plan view. 1 is a key, which consists of a key top 2 and a key switch 3. The key top 2 consists of a lid part 2a and a projection part 2b on the back side thereof, and the collar part 2c at the corner engages with the back side of the board 5 to prevent attachment and detachment (a biasing spring (not shown) is provided). . This key top 2 is movable up and down, and a key switch 3 provided on the main body 4 side faces a protrusion 2b. key switch 3
is pressed by the projection 2b and turned on.

Note that the key top 2 has elasticity and can be removed from the board 5 with a nail or the like.

(Purpose) The present invention was made based on this background, and an object thereof is to provide a key structure that does not require replacing the operation board even if the key switch breaks down.

(Structure) To achieve this, the present invention provides a key top with a single protrusion formed on the back side of the lid that presses the key switch on the main body side, which can be moved up and down with respect to the board and can be attached and detached. The key switch is located at a position offset from the center, and is further characterized in that two or more key switches corresponding to the key tops are installed in a parallel circuit so that any one of the key switches can be pressed even if the direction in which the tops are set is changed. .

An embodiment of the present invention will be described below. Figure 1a,
b is a diagram corresponding to FIGS. 2a and 2b. 3,6,
7 and 8 are four key switches placed in symmetrical positions.

The key top is square in shape and is removable, so key top 2 can be set by rotating it every 90 degrees. On the back of the key top 2 is a protrusion 2b for the key switch.
There is one, and it is located off the center of key top 2. A total of four switches 3, 6, 7, and 8 are provided at 90° positions corresponding to the shifted protrusions, and when key top 2 is set, one of the four switches can be switched. It's getting old.

With the above configuration, even if one key switch becomes defective, copying can be performed with a new switch by changing the setting direction of the key top 2.

With the above configuration of the present invention, the above problems can be avoided at a low cost (the cost of the switch alone is several tens of yen per unit), and there is no need to incur expensive and wasteful repair costs.

Although the present embodiment is shown with a square key top, it is of course possible to use a key top shape such as a circle or a polygon. Further, the present invention is not limited to the print key, and the same configuration can be applied to other keys as well. Further, although the present embodiment supports only one out of four key switches, it goes without saying that by supporting two keys, the reliability of the print key is improved.

FIG. 3 shows an example of the operation board 12, where 9 is a numeric keypad, a clear key, 10 is a special key, and 11 is a display section.

FIG. 4 is an external view of a copying machine in which the operation board 12 is provided on the front side.

(Effects) The present invention is as described above, and according to the key structure according to the present invention, by providing a removable key top and a plurality of key switches, (1) Inexpensive cost increases and fatal user complaints are avoided. can be avoided.

(2) Reliability (redundant design) can be improved with low cost increase.

(3) Repair costs can be significantly reduced.

It has the following effects.

[Brief explanation of the drawing]

FIG. 1 shows a key structure according to an embodiment of the present invention, in which a is a vertical sectional view, b is a plan view, and a second
The figure shows a key structure according to a conventional example, and a
3 is a longitudinal sectional view, b is a plan view, FIG. 3 is a plan view of the operation board, and FIG. 4 is an external view of the entire copying machine. 1...Key switch, 2...Key top, 2a
...Lid part, 2b...Protrusion part, 3, 6, 7, 8...
Key switch.

Claims (1)

[Scope of utility model registration request] A key top having a single protrusion that presses a key switch on the main body side is provided on the back side of the lid so that it can move up and down with respect to the board and can be attached and detached, and this protrusion is provided at a position offset from the center of the key top, Furthermore, even if the key switch corresponding to the key top is changed in the setting direction of the top, either
A key structure for a copying machine, etc., characterized in that two or more keys are installed in a parallel circuit so that each key can be pressed.