JPH0316170Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> This invention relates to a panel switch used, for example, in a control device of a machine tool, etc., and in particular allows for easy replacement of a printed sheet glued onto a frame.
Moreover, the present invention relates to a printed sheet adhesive structure that does not cause the problem of printed sheet peeling.

<Prior art> The general structure of this type of panel switch is briefly shown in Fig. 2. Reference numeral 1 is a frame made of synthetic resin, and the upper surface of the frame 1 is covered with a printed sheet made of flexible synthetic resin. 3 is glued. Further, a plurality of push button switches 4 (one in the drawing) are attached via a substrate 5 in the frame 1, and the key top 4a of the switch 4 is connected to a plurality of through holes 1a provided on the upper surface of the frame 1. It is in contact with the back surface of the printing sheet 3 through each of them. Switch operation symbols, etc. are printed on the printed sheet 3 at positions corresponding to the key tops 4a (not shown), and by pressing a desired symbol on the printed sheet 3, the corresponding push button switch 4 can be activated. A switching operation is performed. In such a panel switch, if the printed sheet 3 is damaged, stained, or has a design change during or after assembly, the printed sheet 3 can be easily replaced. Although this may be required, in the past, in the above configuration, the printing sheet 3 was adhered to the frame 1 using an adhesive with relatively weak adhesive force so that it could be easily peeled off. . However, in this method, since the adhesion of the printing sheet 3 to the frame 1 is weak, the adhesion between the frame 1 and the printing sheet 3 due to the difference in their respective expansion and contraction rates due to temperature changes (hereinafter simply referred to as expansion and contraction rates) There was a problem that the surface peeled off and the printed sheet easily peeled off. On the other hand, if the printing sheet 3 is adhered to the frame 1 with a strong adhesive, the problem of the printing sheet peeling off will be eliminated, but
On the other hand, it becomes difficult or impossible to peel off the printed sheet 3, and the above requirements cannot be met.

<Purpose of the invention> This invention was created in view of the above problems.
A panel switch that does not cause problems such as peeling of the printing sheet due to the difference in expansion/contraction ratio between the frame and the printing sheet, even if the printing sheet is attached to the frame using a weak adhesive so that it can be easily replaced. The purpose is to provide a printed sheet adhesive structure.

<Structure and operation of the invention> The printed sheet adhesive structure of the panel switch of the present invention is a panel switch in which a printed sheet displaying operation symbols of the switch, etc. is adhered to a frame containing a switch, etc., as described above. A buffer sheet, which is relatively thicker than the printing sheet and is made of an elastic member having almost the same expansion and contraction rate as the printing sheet, is strongly adhered to the frame, and the printing sheet can be reattached onto the buffer sheet. It is characterized by being relatively weakly bonded as possible. The surface of this buffer sheet that contacts the frame expands and contracts following the frame due to its elasticity, and as it goes toward the surface that contacts the printing sheet, the expansion and contraction rate approaches the material's original rate. Therefore, the difference in expansion/contraction rate on the adhesive surface of the printed sheet is alleviated by the buffer sheet, so even if the printed sheet is bonded with a relatively weak adhesive so that it can be reattached, the printed sheet will not peel off. There is no.

<Example> Next, an example of the present invention will be described based on the drawings. FIG. 1 is a cross-sectional view schematically showing the main parts of an embodiment of the present invention, and parts equivalent to those in FIG. 2 are given the same reference numerals. In the figure, reference numeral 1 denotes a frame made of synthetic resin (for example, ABS resin), and a buffer sheet 2 is strongly and semi-permanently adhered to the upper surface of this frame using, for example, acrylic double-sided adhesive tape (not shown). Furthermore, the upper surface of this buffer sheet 2 is made of flexible synthetic resin (for example, polyester).
A printed sheet 3 made of a manufactured sheet is adhered to the back side of the printed sheet with an adhesive printed on it. This adhesive is of a type with relatively weak adhesive strength, so that the printing sheet 3 can be easily peeled off from the buffer sheet 2 when replacing the printing sheet 3. The buffer sheet 2 is an elastic member having almost the same expansion and contraction rate as the printing sheet 3, preferably made of the same material as the printing sheet 3 (for example, polyester resin).
The thickness of the printing sheet 3 is considerably thicker than that of the printing sheet 3.

Next, the effects of the buffer sheet 2 in the printed sheet adhesive structure configured as described above will be explained. When the frame 1 expands and contracts due to temperature changes, the surface of the buffer sheet 2 in contact with the frame 1 is bonded with a strong adhesive, so that it elastically expands and contracts to follow the expansion and contraction of the frame 1. The amount of elastic deformation decreases as you move toward the surface in contact with the printing sheet, and the material's original expansion/contraction rate (approximately the same as the expansion/contraction rate of the printing sheet)
approach. Therefore, the difference in expansion and contraction rate on the adhesive surface of the printing sheet 3 is alleviated by the buffer sheet 2,
By appropriately setting the thickness of the buffer sheet 2 to provide sufficient shear elasticity, the elasticity of the surface of the buffer sheet 2 in contact with the printing sheet 3 is made to be approximately the same as that of the printing sheet 3, and the elasticity is applied to the adhesive surface. Stress can be removed. Therefore, even if the printing sheet 3 is bonded to the buffer sheet 2 using an adhesive with a weak adhesive force, the printing sheet will not easily peel off due to the difference in expansion/contraction ratio between the frame 1 and the printing sheet 3, as in the conventional case. Since the adhesive strength is weak, the printing sheet 3 can be easily peeled off, and it can be reattached very easily.

Note that 4 is a push button switch, and a plurality of the push button switches 4 are attached to the frame 1 via a substrate 5, and the key top portion 4a thereof is connected to the top surface of the frame 1 and the buffer sheet 2 through a through hole 1a provided in communication with the upper surface of the frame 1 and the buffer sheet 2. , 2a to the back side of the printing sheet 3, and on the other hand, operation symbols of the switches, etc. are printed and displayed at the positions corresponding to the key tops 4a of the printing sheet 3, and the desired symbol portion of the printing sheet 3 is printed. The switching operation of the corresponding push button switch 4 is performed by pressing the button, as in a conventional panel switch.

<Effects> As explained above, according to the printed sheet adhesive structure of the present invention, the printed sheet 3 is bonded to the frame 1 using a weak adhesive (buffer sheet 2 There is no risk of the printed sheet peeling off due to the difference in the expansion/contraction rate between the two, even if the printed sheet 3 is replaced, and the printed sheet 3 can be easily peeled off when replacing the printed sheet 3, making it extremely easy to replace it. It is something that can be done.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part simply showing an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of a conventional example. 1...Frame, 2...Buffer sheet, 3...Printing sheet.

Claims (1)

[Scope of utility model registration request] In a panel switch in which a printed sheet displaying operation symbols of the switch is adhered to a frame containing a switch, etc., the printed sheet made of an elastic member having almost the same expansion and contraction rate as the printed sheet is placed on the frame. A panel switch characterized in that a buffer sheet relatively thicker than the sheet is strongly bonded, and the printed sheet is bonded relatively weakly to the buffer sheet so that it can be replaced. Printed sheet adhesive structure.