JP2968033B2 - Groove forming device for skin-integrated foam sheet - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a groove forming apparatus for forming, for example, a decorative groove in a skin-integrated foam sheet in which a main pad is integrally formed on a sheet skin.

[Prior Art] Conventionally, for example, a seat cushion (the same applies to a seat back) of a skin-integrated foam sheet (hereinafter simply referred to as a seat) is usually provided with a groove for decoration for the purpose of enhancing the design effect of the seat. Are formed.

As shown in FIG. 5, a seat cushion (or a seat back) of the skin-integrated foam sheet is set by setting the seat skin 1 on the lower mold 2 and then injecting a foamed resin into the back surface of the seat skin 1, The main pad 5 is integrally formed on the back surface of the sheet skin 1 by closing the mold 3 and foaming and solidifying the resin. The decorative groove 8 is formed at the same time when the main pad 5 is foam-molded. Therefore, the molding surface 2a of the lower mold 2 has a position where the groove 8 is to be formed. The groove forming projections 6 were provided corresponding to the above.

Further, as a method of setting the sheet skin 1 on the lower mold 2, a so-called grammar method has been conventionally used. According to the grammar method, the lower mold 2 is formed in a substantially box shape, and the inside thereof is an intake chamber 2b, and a large number of suction holes 7 to 7 communicating with the intake chamber 2b are formed in the molding surface 2a. Have been. An air vent hole is provided on the right side of the lower mold 2 in the figure.
2c is formed, and an air extracting means V such as a vacuum pump is connected to the air extracting hole 2c.

With the above configuration, the sheet skin 1 is formed on the molding surface 2a of the lower mold 2.
When it is set to, the air in the suction chamber 2b is evacuated by the air bleeding means V, so that the sheet skin 1 is sucked by the suction holes 7 to 7 and is fixed to the lower mold 2 in close contact therewith. Things.

Here, as shown in FIG. 6, the sheet skin 1 is formed by laminating a cover pad 1b and a wading cover 1c on the back surface of a skin fabric 1a, for example. It is formed with.

Since the sheet skin 1 is formed of a material having no air permeability, the sheet skin 1 can be sucked onto the molding surface 2a of the lower mold 2 by the grammar method.

The wadding cover 1c also has a function of preventing the foamed resin from impregnating the cover pad 1b when the foamed resin is foamed and solidified on the back surface of the sheet skin 1.

When the sheet skin 1 is set on the lower mold 2 provided with the groove forming projections 6 by the grammar method described above, the grooves 8
It is necessary to adsorb the sheet skin 1 along the side surface of the groove forming projection 6 (indicated by a dashed line in FIG. 7) to the forming surface 2a in order to form the sheet in a good shape. A predetermined portion of the sheet skin 1 was pressed against the base of the groove forming projection 6 using an assist jig 9 as shown in FIG.

By doing so, a sharp groove 8 having a shape substantially following the groove forming protrusion 6 can be formed on the seat cushion or the seat back.

[Problems to be solved by the invention]

However, as described above, the method of using the assist jig 9 to press the sheet skin 1 against the groove forming protrusions 6 to cause the sheet skin 1 to follow the groove has the following problems.

That is, the wadding cover is provided by the assist jig 9.
1c was torn, so that sufficient evacuation could not be performed, and the setting state of the sheet skin 1 was sometimes defective.

In order to perform this work smoothly, the sheet skin 1
Is required to be made of a material having relatively high elasticity, and it was not possible to set the inextensible sheet skin in a favorable state.

An object of the present invention is to solve the above conventional problems.

Means for Solving the Problems In order to solve the above-described conventional problems, the present invention tunes a groove forming plate protruding from a molding surface of a lower mold and the groove forming plate to the suction operation of the sheet skin. And lifting means for supporting the lower mold so as to be able to move up and down.

[Action]

According to the above configuration, the seat skin set when the groove forming plate is at the upper end position, the lower mold suction chamber is evacuated, and when the groove forming plate is lowered to the lower end position, the tabs are reduced by the lowered amount. Then, the evacuation is performed, and the sheet skin of the dubbed portion is sucked and fixed to the lower mold along the groove forming plate.

〔Example〕

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

In the present example, the seat cushion and the seat back are the same, so that both are collectively referred to as a skin-integrated foam sheet.

FIG. 1 shows the entire lower mold 2 in which a groove forming apparatus 10 for a skin-integrated foam sheet (hereinafter simply referred to as a sheet S) of the present embodiment is incorporated.

The lower die 2 is formed in a substantially box shape, the inside of which is an intake chamber 2b, and a molding surface 2a having a predetermined shape is formed on the upper surface thereof. Further, a large number of suction holes 7 to 7 are formed in the molding surface 2a, and all of the suction holes 7 communicate with the above-described suction chamber 2b. Further, an air bleeding hole 2c is formed on the right side of the lower mold 2 in the drawing.
An air bleeding unit V such as a vacuum pump is connected to 2c so that the suction chamber 2b of the lower die 2 can be evacuated. Note that the suction holes 7 to 7 are not limited to circular holes, but may be long groove holes.

The groove forming apparatus 10 is incorporated in the lower die 2 configured as described above.

The groove forming apparatus 10 includes a groove forming plate 12 protruding from an insertion groove 2 e formed on a forming surface 2 a of the lower mold 2, and a groove forming plate 12.
(In this example, indicated by an air cylinder 11) for supporting the lower die 2 so as to be able to move up and down.

The air cylinder 11 has a rod 11b whose lower die 2
It is mounted so as to protrude upward through an insertion hole 2f formed in the bottom surface 2d of the base 11a, and is configured to vertically stroke the rod 11b by compressed air via hoses 11a, 11a.

It should be noted that the insertion hole 2f is appropriately sealed to prevent air leakage.

Next, the groove forming plate 12 is formed in the shape of a strip having a plate thickness d, and is attached to the distal end of the rod 11b with the width direction of the groove forming plate 12 being the vertical direction.

The groove forming plate 12 attached in this manner projects from the forming surface 2a via the insertion groove 2e and is supported so as to be able to move up and down.

The insertion groove 2e is formed to be slightly wider than the thickness d of the groove forming plate 12 so as to function also as the suction hole 7.

Here, the upper end position and the lower end position of the groove forming plate 12 are regulated by, for example, a stopper member (not shown) or the like so as to be at a predetermined height from the forming surface 2a. The height of the groove forming plate 12 at this upper end position is shown as h1, and the height at the lower end position is shown as h2. The height h2 at the lower end position is set to be the depth of the groove 8 to be formed in the sheet S,
The thickness d of the groove forming plate 12 is the width of the groove 8.

Although FIG. 1 shows an example in which the above-described groove forming device 10 is provided only at one location substantially at the center of the lower mold 2, an appropriate number of locations are provided corresponding to the locations where the grooves 8 are to be formed. The groove forming apparatuses 10 to 10 having the above-described configuration are incorporated into the apparatus.

As described above, the sheet skin 1 is provided with a cover pad 1b and a wading cover 1c on the back surface of the skin fabric 1a.
Is formed into a layer by laminating, for example, (see FIG. 6), and the wading cover 1c is also formed of a film material having no air permeability.

The groove forming apparatus 10 of the present embodiment is configured as described above and is incorporated at a predetermined position of the lower die 2, and has the following operational effects by this configuration.

 First, an operation procedure of the groove forming apparatus 10 of the present example will be described.

When compressed air is supplied to the air cylinder 11 as shown in FIG.
Is held at the upper end position. At this time, the groove forming plate 12 is at a height of h1 from the forming surface 2a as described above.

In this state, the sheet skin 1 is set at an appropriate position of the lower mold 2 with the skin fabric 1a facing the molding surface 2a, and the periphery of the sheet skin 1 is fixed by the clamp 4 (see FIG. 1).

Next, the air evacuating means V is operated to evacuate the intake chamber 2b of the lower die 2. As a result, the air between the molding surface 2a of the lower mold 2 and the sheet skin 1 is also extracted through the suction holes 7 to 7, so that the sheet skin 1 comes into close contact with the molding surface 2a, that is, the lower mold 2. Become.

Here, since the groove forming plate 12 is at the upper end position of the height h1,
At the position of the groove forming plate 12, the sheet skin 1 cannot follow the left and right side edges 12a, 12a in the drawing, and remains in a floating state.

Next, while continuing the evacuation, the constituent plate 12
Is lowered to its lower end position (see FIG. 4).

When the groove forming plate 12 is lowered from the upper end position to the lower end position, the raised portion 1d of the sheet skin 1 is moved to the groove forming plate 12.
The raised portion 1d is sucked by the portion with the dub as much as the lowered portion, and the raised portion 1d becomes the side edge 12a of the groove forming plate 12.
It will be adhered in a state following 12a.

After the sheet skin 1 is brought into close contact with the groove forming plate 12 in this way, the foamed resin is injected, the upper mold 3 is closed, and the foamed resin is foamed and solidified.
The main pad 5 is formed.

As described above, predetermined grooves 8 to 8 are formed in the process of forming the skin-integrated foam sheet S.

The grooves 8 to 8 are formed so that the sheet skin 1 is formed on both side edges of the groove forming plate 12.
Since the foamed resin is foamed and solidified in a state along 12a, 12a, it has a good shape (sharp shape).

When the sheet skin 1 is made to follow the groove forming plate 12, the groove forming device 10 lowers the groove forming plate 12 from the upper end position to the lower end position instead of using an assist jig as in the related art. A dub is generated in 1 and the dubbed portion is sucked to be closely adhered to the groove forming plate 12.

Therefore, unlike the conventional case, there is no need to press the sheet skin 1 using the assist jig, so that the wading cover 1c and the like are not broken, and the seat cover 1c is held in a state where the anti-air permeability of the sheet skin 1 is securely maintained. It can be made to adhere to the mold 3 by suction.

Furthermore, since the grooved plate 12 is lowered from the upper end position to the lower end position, and the dubbed portion is along the grooved plate 12, it is not necessary to use the elongation of the sheet skin as in the conventional case, so According to the groove forming apparatus 10, it is possible to form a good groove even with a non-stretchable sheet skin.

In the illustrated air cylinder 11, the stroke of the rod 11b was based on compressed air in both directions.
On the descending side, the rising side may be opened to the atmosphere without using compressed air, and the groove forming plate 12 may be lowered by the weight of the groove forming plate 12 and the attraction force of the sheet skin 1.

Further, the means for raising and lowering the groove forming plate 12 is not limited to the air cylinder 11, but it is essential that the groove forming plate 12 can be moved up and down by a predetermined stroke.

Further, the groove forming apparatus of the present embodiment can be applied to a case where a decorative groove is provided in a seat mounted on a vehicle, and the skin of a vehicle seat is usually formed by sewing a skin piece. Generally, for example, when forming a groove along a seam portion that forms a boundary between a main seat portion and left and right side holder portions, a groove forming device is formed so that a groove forming plate is along the seam portion. Are appropriately arranged.

〔The invention's effect〕

Since the present invention is configured as described above, the sheet skin is not pressed by using the assist jig, so that the wading cover and the like are not damaged, and the sheet skin is surely brought into close contact with the lower mold. Is possible.

Furthermore, since the dub is temporarily generated in the sheet skin and the dubbed portion is sucked and the groove is formed along the groove forming plate, there is no need to use the elongation of the sheet skin as in the related art. Therefore, there is an effect that it can be similarly applied to a sheet skin without stretching.

[Brief description of the drawings]

FIGS. 1 to 4 relate to an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a lower mold on which a sheet skin is set, and FIGS. 2 to 4 are enlarged views of a portion A in FIG. FIG. 5 is an explanatory view of a forming process of a skin-integrated foam sheet. FIG. 5 is a longitudinal sectional view showing a state in which the sheet skin is set on a conventional lower mold, and FIG. 6 is an enlarged view of a portion B in FIG. , FIG. 7 is C in FIG.
It is a part enlarged view. S: foam sheet integrated with skin V: air bleeding means 1, seat skin 2 ... lower mold (2b ... intake chamber) 3, upper mold 5 ... main pad 6 ... groove forming projection, 7 …… Suction hole, 8… Groove 10 …… Groove forming device 11 …… Air cylinder, 12 …… Groove forming plate

Claims (1)

(57) [Claims] 1. A groove forming apparatus for forming a groove in a seating surface of a skin-integrated foamed sheet in a skin-integrated foamed sheet obtained by integrally foaming and molding a main pad in a state where a seat surface is adsorbed on a molding surface of a lower mold. A groove-formed plate protruding from the molding surface of the lower mold, and a skin-integrated foam sheet having a structure having lifting means capable of moving the groove-formed plate up and down in synchronization with the suction operation of the sheet skin. Groove forming device.