JPS59202816A - Heater supporter for vacuum forming machine - Google Patents

Abstract

PURPOSE:To prevent a sheet from overheating and to make possible utilization of an installation space effectively by dividing a heater, departing the divided heaters on both sides and supporting them enabled in freely retreating manner. CONSTITUTION:Air cylinders 38a, 38b are driven in order to move a lower heater 16. When rods 40a, 40b are contracted, levers 37a, 37b revolve about transmission shafts 36a, 36b as fulcrums in the outside directions and inside links 32a, 32b, wherein base end parts are fixed to transmission shafts 36a, 36b are revolved by the above-mentioned revolutions by the same angles as the revolving angles of the levers 37a, 37b are simultaneously, the inside links 32a, 32b revolve about the lowest hinges as fulcrums. By parallelogram link mechanisms 35a, 35b composed of the divided heaters 17a, 17b and the like, the divided heaters 17a, 17b, drawing fan-shaped loci from the central position in a width direction of the sheet 12, they separate and move respectively toward both sides and are supported at a specified position obliquely downward on either sides.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support device for a heater used for thermoforming a sheet made of synthetic resin, styrene foam, or the like.

B. Conventional Example Generally, when forming a sheet, the sheet is sequentially unrolled from a sheet roll and fed intermittently in predetermined size increments, heated once by a heating device during the transfer route, and then formed into a predetermined shape by a forming device. It is then sent to the next process. by the way,
When some kind of trouble occurs during sheet forming and the machine is to be inspected and repaired, or when the mold of the forming equipment is to be replaced, etc., the sheet will be overheated if the heating device is left running, so it is normal to turn off the heating device. Turn off the power, but even after turning off the power, the radiant heat is extremely high temperature (approximately 500 to 600 degrees Celsius)
Therefore, there was a problem in that the sheet was heated and softened by the radiant heat and sagged under its own weight, and the sagging portion came into contact with the lower heater, causing the sheet to burn.

Therefore, conventionally, when inspecting and repairing a machine or replacing a mold, a device such as that shown in FIG. 1 was used to move the heater out of the sheet transport path. That is, in the same figure,
(1) is a machine frame of a vacuum forming machine, (2) is a sheet that is intermittently transferred by an appropriate transfer means, and (3) is a sheet that is installed at a predetermined position in the transfer path of the sheet (2). heater
(4) and a lower heater (5).

(6) is a carrier with a U-shaped cross section on which the heaters (4) and (5) are mounted, and (7) is a rail installed perpendicular to the transport path of the sheet (2). A carrier (6) is mounted movably via wheels (8). (9) is an air cylinder for moving the carrier (6). When repairing the dot edge of the machine or replacing the mold, the air cylinder (9) is operated to extend the rond (10), and the carrier (6) is moved outside the machine frame (1) as shown by the dashed line. When the work is completed, the carrier (6) is moved into the machine frame (1).

However, in the above conventional example, heaters (4) (5)
) to the outside of the machine frame (1), a space for temporary evacuation of the carrier (6) is required, which requires a large installation space and places restrictions on the installation location. In addition, since the heating time of the sheet (2) is within a few seconds, the heater (
4) Even if the power to (5) is turned off and the heaters (4) and (5) are evacuated to the outside of the machine frame (1), the hanging portion (2a) of the sheet (2) will not touch the heater (4) during the movement. The hanging portion (2a) is excessively heated by the radiant heat and hangs further, which causes the end portion (2a) of the heater tube 5) which is moving outward.
5a) and the sheet (2) could catch fire. On the other hand, when the heaters (4) and (5) move into the machine frame (1), the edges (2b) of the seat (2) are overheated, resulting in sheet loss when restarting. .

OBJECTS OF THE INVENTION It is an object of the present invention to prevent excessive heating of a sheet and to make effective use of installation space.

C9 Configuration of the Invention The present invention provides a sheet that is intermittently fed by a predetermined size (12
), in which the heater (16) is divided at the center position in the width direction of the sheet (12), and the divided heater (17a) (
17b) is attached to a member such as the machine frame (11) so as to be retractable in both directions using link mechanisms (35a) and (35b).

D. Example 2 to 5 show embodiments of the invention.

In the same figure, (11) is the machine frame of the vacuum forming machine, (12)
is sequentially fed out from the sheet roll and transferred to an appropriate transfer device (1
3), the sheet is intermittently transported by a predetermined size, (
14) is a heating device consisting of an upper heater (15) and a lower heater (16) provided in the transport path of the sheet (12), and the upper heater (15) can move up and down in the vertical direction. The lower heater (16) is divided at the center position in the width direction of the seat (12).
(17a) and (17b) are supported so as to be retractable while drawing fan-shaped trajectories in both directions. (18) is a rotating shaft that is rotatably supported on the machine frame (11) across the width via brackets (19). is formed, and an operating handle (21) is attached to one end thereof. (22) (22) is the rotating shaft (1
8) is a suspension holder that is fitted into the right-hand screw (20a) and left-hand screw (20b) so as to be movable in the axial direction.
22) Shaft portions (23) at both ends of (22) (2
3), the upper ends of levers (24) and (24) are rotatably pivoted and suspended, respectively, and the levers (24)
The lower end portion of (24) is rotatably attached to a mounting plate (26) attached to the upper heater (15) via a bracket (25) to suspend the upper heater (15). (27
) (27) is a wheel rotatably supported on each end shaft portion (23) (23) of the suspension body (22) (22), (2B) (2B) is mounted on the machine frame (11). Support frame fixed across the width (29)
(29) is a rail fixed to the support frame (2B> (2B), and the wheels (27) of the suspension body (22) (22>) are connected to the rail (29) (2B).
9) Place it on top. (30) is the above upper heater (15)
The guide rod (3) is fixed upright on the corner of the mounting plate (26).
Reference numeral 1) denotes a guide tube fixed to the support frames (28) (28) in correspondence with the guide rod (30), and the guide rod (30) is slidably inserted into the guide tube (31).

(32a) and (32b) are brackets placed at four symmetrical positions in the width direction of the lower horizontal frame (33) of the machine frame (11).
(34a) (34b) The eight links are rotatably connected upright via the links (32a) and (32b).
The divided heaters (17) of the lower heater (16) are connected to the upper end of b) via brackets (41a) and (41b), respectively.
a) Parallelogram link mechanism (35) by pivoting (17b)
a) (35b), and the divided heater (1
7a) (17b) is supported so that it can be symmetrically retracted outward. (36a) (36b) is a transmission shaft rotatably bridged between the brackets (34a) and (34b) located on the inside, and the above-mentioned inside link (32a)
(32b) to simultaneously rotate the link (32a).
) (32b) is attached to each transmission shaft (36a).
(36b) and the transmission shaft (36b).
6a) There is a lever (37a) approximately in the center of (36b).
(37b) are fixed on their respective pivots and erected.

(38a) (38b) are air cylinders installed via brackets (39a) (39b) at symmetrical positions on both sides of the machine frame (11).
The tips of the rondos (40a) (40b) of (38b) are attached to the upper ends of the levers (37a) (37b) which are pivotally supported on the transmission shafts (36a) (36b), and When activated, the links (32a) and (32b) are rotated, and the divided heaters (17a) and (17b) are retracted diagonally downward on both sides.

Next, the operation of the present invention will be explained as follows.

If it becomes necessary to inspect and repair the machine or replace the mold during molding of the sheet (12), the upper and lower heaters (15) and (16) are respectively moved after turning off the power to the heating device (14). That is, when moving the upper heater (15), operate the operating handle (21) to move the rotation shaft (18).
) is rotated in a predetermined direction, and the hanging holder (22) (2
2) is moved symmetrically outward in the axial direction. The above suspension body (22
) (22), the lever (24) (24
) tilts outward using the lower end pivot point as a fulcrum, and the upper heater (
15) is pulled upward and separated from the sheet (12). Thereby, the sheet (12) will not be heated and softened by the radiant heat of the upper heater (15), and excessive heating of the sheet (12) can be prevented. It goes without saying that the rotating shaft (18) may be rotated electrically instead of manually using the operating handle (21).

At the same time as the upper heater (15) is moved, the lower heater (1
6) Move. That is, the air cylinder (38a)
(38b) is activated and its rondo (40a) (40
When b) is retracted, the levers (37a) (37b)
rotates outward about the transmission shafts (36a) (36b), and this rotation causes the inner links (32a) (32b) whose base ends are fixed to the transmission shafts (36a) (36b).
) rotates at the same angle as the levers (37a) and (37b), and the inner and outer links (32a) and (37b) rotate accordingly.
2b) rotates around its lower end pivot point as a fulcrum, and the divided heater (17a) ( 17b) is separated from the center position of the sheet (12) in the widthwise direction while drawing a fan-shaped locus in both directions, and is held at a predetermined position diagonally downward on both sides. In addition, at this time, the divided heaters (17a) (17b
) is located within the machine frame (11) and does not come out of the machine frame (11).

When inspection and repair of the machine or mold replacement is completed, the upper heater (15) rotates the rotating shaft (18) in the opposite direction to lower the lower heater (16), and the divided heater (17a) of the lower heater (16) (17b) is the air cylinder (38a) (38
b) Activate Rondo (40a) (40b)
are extended, moved inward, and returned to their original positions.

Effects of the Invention In the present invention, the heater is divided and the divided heaters are separated in both directions and supported so that they can be retracted, so that the heater is always supported within the machine frame of the molding machine and does not come out of the machine frame. Therefore, the installation space is about half that of the conventional one, and there are no restrictions on the installation location. In addition, since the heater separates and moves to the left and right from the center position in the width direction of the sheet, even if the sheet sag due to heating and softening, the sheet will not be overheated, and even if the sheet sag even further, the lower part will not be heated. Since there is no heater heat source, there is no risk of the seat burning.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional heater support device. Second
3 is a side view of the upper heater, FIG. 4 is a side view of the lower heater, and FIG. 5 is an explanatory diagram of the operating state of the lower heater. (IIL-m = machine frame, (12) - sheet, (14)
- heating device, (16) - heater, (17a) (
17b) - split heater, (35a) (35b
) - Link mechanism.

Claims (1)

[Claims] (11 In a device in which a heating device is installed in the transport path of a sheet that is intermittently fed by a predetermined size, the heater is divided at the center position in the width direction of the sheet, and the divided heater can be moved in both directions by a link tracing mechanism. A heater support device for a vacuum forming machine, characterized in that it is attached to a member such as a machine frame.