JPH07275Y2 - Heat shield device for resin sheet molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a heat shield device in a resin sheet molding machine for mass-producing food trays, etc. The heating plate is advanced between the heating plate and the intermittently stopped resin sheet or molded product to prevent deformation due to radiant heat from the heating plate.

(Prior Art) There is no resin sheet molding machine that can be compared with the present invention.

(Problems to be Solved by the Invention) A continuous resin sheet that runs on a hot plate having heating means and stops intermittently is fixed by lowering a vertically moving molding die, and the hot plate is provided by a vacuum suction means and a pneumatic means. In a resin sheet molding machine that heats by closely contacting with, and thermoforms by differential pressure after the end of heating, waits to interrupt the molding work while continuing the heating means of the hot plate for automatic stop due to accident detection or inspection etc. It is normal to In that case, if heating of the hot plate is interrupted, it takes time to restart the operation, and the molding efficiency decreases. However, when standing by with heating, since the resin sheet or molded product is close to the hot plate, radiant heat of the hot plate causes deformation by heating and softening, which causes molding failure when restarting operation, or At the time of interruption, the molded product that has been molded at the time of interruption is deformed and becomes a defective product. Further, depending on the situation, the softened resin sheet and the molded product adhere to the hot plate, so that it has to be removed. However, it is necessary to avoid such a situation.

The present invention does not cause the resin sheet and the molded product to be deformed by the radiant heat of the hot plate even when the operation is restarted after an indefinite time, and therefore, the operation can be restarted immediately after any time elapses from entering the standby mode. It is an object of the present invention to make it possible.

(Means for Solving the Problems) The heat shield device in the resin sheet molding machine of the present invention has the above-mentioned purpose, and is a continuous resin which runs on a hot plate having a heating means and intermittently stops. In a resin sheet molding machine in which a sheet is thermoformed by being brought into close contact with the surface of the hot plate by moving down a vertically moving mold, a pair of reversibly driven endless running zones is provided and the endless running zone is allowed to move. A flexible heat insulating material is attached, and when the molding operation is interrupted, the endless running belt is driven to move the flexible heat insulating material between the surface of the continuous resin sheet and the surface of the hot plate, and at this time, the continuous resin sheet. Is configured to be supported from the back by a flexible heat shield.

(Embodiment) The attached drawings show an embodiment of the present invention. Fig. 1 is a side view of the molding machine, Figs. 2 and 3 are partially enlarged side views thereof, and Fig. 2 is a shielding heat material. Fig. 3 shows the retreat, Fig. 3 shows the same advance, Fig. 4 is an enlarged front view taken along the line A-A in Fig. 2, and Fig. 5 is a feeding table 4 etc. on the left side of Figs. It is the front view which omitted.

1 is a machine base, 2 and 2 are provided on the machine base 1, and a molding area 3 is provided between the spaces.
With the front and rear sheet guide plates, the continuous resin sheet c wound around the winding shaft 5 supported by the feeding table 4 attached to the rear side surface is pulled forward by a device (not shown) to be fed out, and the sheet c is guided to the rear portion. The sheet is passed through the upper surface of the plate 2, the molding area 3, and the upper surface of the front sheet guide plate 2 by intermittently stopping.

On the machine base 1, a heating plate 6 is provided on the lower surface of the resin sheet c which is intermittently stopped in the molding zone 3, and a heater box 7 for heating the heating plate 6 from the lower surface in a variable temperature is provided. The sprocket wheels 11 and 12 are pivotally supported on a pair of front shaft support arms 8 and 8 which are inclined to the left and right in the front direction, and the sprocket wheel 13 is pivotally supported on the rear left and right rear shaft support arms 9. A sprocket wheel 14 is pivotally supported on a pivot arm 10 below the front surface (or below the rear surface) of the platform 1, and an L-shaped reciprocating endless chain 15 is laid over each of these sprocket wheels 14. The sprocket wheel 11 on one side is provided with a gear 16 coaxially as shown in FIG. The endless chain 15 is reversibly driven by 18.
The above-mentioned endless chain may be an endless running belt such as a timing belt. (The reversible motor 18 may be a reversible actuating member such as a piston.) Several leg pieces 21 are attached to chain pieces of a pair of left and right endless chains 15 at arbitrary intervals, and the left and right leg pieces 21 are paired. Support rods 22 are crossed across the machine base 1 from side to side, and a flexible heat shield 23 made of a heat-resistant felt, a heat-resistant thick woven fabric or the like is mounted on each of the support rods 22.

The flexible heat shield 23 intervenes between the resin sheet c and the heat plate 6, and when the resin sheet is being molded during operation, as shown in FIG. At the same time, the resin sheet molding is interrupted, and at the same time, as shown in FIG. 3, the resin sheet c is moved upward on the hot plate 6 in the molding region 3 to support the resin sheet c from the back side.

Reference numeral 25 denotes an upper die that is slidably attached to guide posts 26 standing on both sides of the machine base 1 and is vertically moved on the hot plate 6 in the forming area 3. Inside the upper die 25, differential pressure forming is performed. Mold (not shown)
The upper die 25 is connected to the lower end of the rod 28 of the cylinder 27 fixed to the gate portion of the guide post 26 of the machine base 1.

(Operation) The present invention is directed to an endless running belt such as a chain at the time of the automatic stop of the operation of the resin sheet molding machine or the stop of operation for inspection.
The flexible heat shield 23 is moved from the retracted position shown in FIG. 2 to the advanced position on the hot plate 6 shown in FIG. 3 by 15 and heating of the hot plate 6 of the resin sheet c stopped in the molding zone 3 is continued. Radiation heat based on the above is prevented and the operation is restarted. When the operation is restarted, the endless traveling belt 15 moves the flexible heat shield 23 from the advance position shown in FIG. 3 to the retracted position shown in FIG. c is heated by the hot plate 6.

(Effect) The present invention stops the operation of the hot plate of the resin sheet molding machine while continuing the heating by the heating means to prevent the influence of the radiant heat to the resin sheet and the molded product to enter the standby state, and stop the operation, that is, the standby state. In this case, it is possible to carry out the necessary treatment in case of entering into, and there is an effect that the resin sheet can be molded immediately after entering into the operation after an indefinite time from the stand-by, in the same manner as before the stand-by.

Particularly, in the present invention, when the molding operation is interrupted, not only the radiant heat from the hot plate is blocked by the flexible heat shield but also the resin sheet is supported from the back side, so that the heated resin sheet bends downward. Can be reliably prevented, and defective molding due to bending can be eliminated when the operation is restarted.

[Brief description of drawings]

The attached drawings show an embodiment of the present invention. FIG. 1 is a side view of the present molding machine, FIGS. 2 and 3 are enlarged side views of the same, and FIG. FIG. 3 shows the advance, FIG. 4 is an enlarged side view taken along the line AA in FIG. 2, and FIG. 5 is a front view in which the feeding table 4 and the like on the left side of FIGS. 2 and 3 are omitted. is there. c ... Resin sheet, 1 ... Machine base, 2 ... Guide plate, 3 ...
Forming area, 4 ... Feeding stand, 5 ... Winding shaft, 6 ... Hot plate, 7 ... Box of heater 8, 9, 10 ... Support arm 11, 12, 13, 14 ... Sprocket wheel 15 ... … Endless chain, 16 …… Gear, 17 …… Bracket 18 …… Flexible motor, 19 …… Gear, 20 …… Chain, 21…
… Leg piece 22 …… Support rod, 23 …… Flexible heat shield, 25 …… Upper mold 26 …… Guide post, 27 …… Cylinder, 28 …… Rod

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 999999999 Tsukishima Machine Sales Co., Ltd. 4-8-14 Tsukishima, Chuo-ku, Tokyo (71) Applicant 999999999 Tsukishima 4-8-14 Chuo-ku, Tokyo No. (72) Inventor Kazuo Asano 221 Miyukiyama, Tenpaku-ku, Nagoya, Aichi, Asano Research Institute, Inc. (72) Inventor Toshihiro Takai, 221 Miyukiyama, Tenpaku-ku, Nagoya, Aichi, Asano Research Institute, Inc. (72) Inventor Mitsuaki Takifuji 221 Miyukiyama, Tenpaku-ku, Nagoya, Aichi, Ltd. Inside the Asano Research Institute (56) References JP-A-3-158224 (JP, A) JP-A-61-193825 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A resin sheet molding machine for thermoforming a continuous resin sheet, which runs on a hot plate having heating means and stops intermittently, in close contact with the surface of the hot plate by lowering a vertically moving mold. In, while providing a pair of endless running belts that are reversibly driven, a flexible heat shield is attached to the endless running zones,
When the molding operation is interrupted, the endless running belt is driven to move the flexible heat shield between the surfaces of the continuous resin sheet and the heat plate, and at this time, the continuous resin sheet is used as the flexible heat shield. A heat shield device in a resin sheet molding machine, characterized in that it is configured to be supported from the back.