JPH0240821A - Cover opening/closing detecting switch installing structure - Google Patents

Abstract

PURPOSE:To make it possible to carry out a switching operation constantly with receiving no influence resulting from a variation of size of the cover by a bending or the like, a mechanical operation vibration, or the heating, by installing a magnet on condition fixing at the tip of a spring at the cover side, and composing the magnet to contact to a Hall IC fixed to a housing. CONSTITUTION:A magnet 1 to carry out a switching operation to a Hall IC 2 which is contacted and fixed is installed in a magnet case 3 which has the thickness to maintain an optimum interval, and at the same time, the magnet 1 is protected and the whole body is made to extend and contrate with a spring 4. As a result, a constantly stabilized switching operation can be carried out even though an accuracy unevenness, especially a bending, is generated to parts to fix the magnet 1 or the Hall IC 2, or even though the magnetic force of the magnet 1 is reduced by a vibration or a heating.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a cover opening/closing detection switch mounting structure.

[Conventional technology]

When using the conventional cover opening/closing detection switch mounting structure for a printing device, etc., as shown in Figure 2, the magnet 1 is fixed to the cup 5' by adhesive, and the Hall IC 2 is fixed to the housing 3 by adhesive or soldering. 0N-OF due to the change in the distance between the magnet and Hall IC due to the opening and closing of
I was making it perform the F action.

[Problem to be solved by the invention]

However, with the conventional cover opening/closing detection switch mounting structure described above, the dimensional accuracy of the cover, especially the spacing between the magnet and the Hall IC due to warping, may change and the detection operation may not be performed normally. ) may change due to mechanical vibration, resulting in abnormal operation, or heat generated internally may cause the gap to change, or the magnetic force of the magnet may decrease, reducing the operating margin.
There was a drawback that normal opening and closing operations could not be maintained.

[Means to solve the problem]

The cover opening/closing detection switch mounting structure of the present invention incorporates a magnet fixed to the tip of a spring on the cover side with adhesive, etc., and attaches the magnet to the Hall IC (or case protecting the Hall IC) fixed to the housing (f operation panel). By making contact with the switch, the switch can be operated under any conditions without being affected by changes in dimensions due to warping of the cover, mechanical vibration, or heat.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

The cover opening/closing detection switch mounting structure shown in Fig. 1 consists of a magnet 1, a Hall IC 2 that operates as a switch due to the magnetic force of the magnet 1, and a magnetic case that protects the magnet 1 and maintains an optimum distance between the Hall IC 2 and the Hall IC 2. 3 and always press the magnet) l onto the Hall IC 2 with a spring 4 to maintain an appropriate spacing, and a spring 4.
The device includes a cover 5 incorporating a unit with a magnet 1 attached to the tip thereof, and a housing 6 to which a Hall IC 2 is adhesively fixed.

This cover 5 is provided with a magnet case 3, and by housing the magnet 1 in this magnet case 3 and suppressing this magnet 1 with a spring 4, the magnet 1 is always brought close to the Hall IC 2. maintained.

〔Effect of the invention〕

In the cover opening/closing detection switch mounting structure of the present invention, the magnet that operates the switch for the Hall IC that is fixed with adhesive is placed in a magnetic case with a wall thickness that maintains an optimal spacing, and the magnet is protected at the same time, and the entire structure can be expanded and contracted with a spring. By doing so, magnets and Hall ICs can be
Even if there are variations in the accuracy of the parts to be installed, especially warpage,
Another advantage is that even if the magnetic force of the magnet decreases due to vibration or heat, stable switch operation can always be obtained.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing an embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view showing an example of the conventional technology. l...Magnet, 2...Hall IC
, 3... Magnet case, 4... Spring, 5.5'... Cover 6...
·housing. Agent: Patent Attorney Otoo Uchihara 2

Claims (1)

[Claims] a housing and a Hall IC fixed to the housing
A cover opening/closing detection switch mounting structure comprising: a cover having a magnetic case; a magnet housed in the magnetic case; and a spring for pressing the magnet against the Hall IC.