JPH0454989Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a tenter for obtaining extremely thin films such as vinyl chloride films used to cover soil and accelerate the growth of plants.

(Prior Art) A film supplied via a supply roll is supplied to a tenter via a preheating roll, and the film sent out from the tenter is wound onto a take-up roll via a cooling roll. The tenter has a supporting conveyance member in which a chain is provided with gripping pieces for supporting both ends of the film, and both gripping conveyance members are screwed together on the film supply side and the film delivery side, and the film supply side and the film supply side of both support conveyance members are screwed together. A film tenter is known in which the distance between supporting and conveying members on the film feeding side and the film feeding side can be adjusted freely.

(Problem to be solved by the invention) However, in the conventional tenter, the length of both support conveyance members is constant, and according to this, in order to increase the width expansion rate by the tenter, the distance between the film supply side of both support conveyance members is Increase the distance between the sending side and the sending side. That is, if the inclination of the support conveyance member is increased with respect to the direction of movement of the film, a large gap will be created between the tenter and the cooling roll, and the film will move without being supported by anything during this gap, making it difficult for the film to be properly attached to the cooling roll. This makes it difficult to feed the film and causes problems such as the expanded film shrinking before it is cooled and fixed.

(Means for Solving the Problems) In order to achieve the above object, the present invention supplies the film supplied via a supply roll to a tenter via a preheating roll, and the film sent out from the tenter. The tenter winds the film onto a take-up roll via a cooling roll, and the tenter includes a supporting conveyance member having support pieces for supporting both ends of the film in the chain, and both support conveyance members are connected to the film supply side and the film delivery side. In a structure in which the spacing between both support and conveyance members can be freely adjusted on the film supply side and the film delivery side of both support and conveyance members by screwing them together on the supporting and conveying sides, the chain constituting each support and conveyance member is The front and rear sprockets that have been spanned are supported by respective support frames provided on the supply side and the delivery side, and at least one of the support frames is movable relative to the other in the running direction of each chain, and each support frame is A sprocket is provided on a support base that is screwed into each screw, and a sprocket that pulls the middle of each chain is provided on a movable member movable in the running direction of each chain.

(Function) In the film tenter constructed as described above, as shown in FIGS. 1 and 2, the screw rod provided on the front end side is rotated to adjust the distance between the front end side of both supporting and conveying members from the supply roll. The width of the film is expanded by adjusting the width to match the width of the film to be supplied, and by rotating the screw rod on the rear end side, the distance between the supporting and conveying members is adjusted to a larger value.

At this time, in order to increase the width expansion rate by the tenter, when the distance between the rear end sides of both supporting and conveying members is made larger than the interval on the front end side, that is, when the inclination of the supporting and conveying members with respect to the film running direction is increased, the support frame is It moves in the running direction of the chain to open the gap between the sprockets on which the chain is stretched, and the sprocket on the moving member moves forward by that amount and is pulled by it to pay out the stored chain. Therefore, the conveyance distance in the front-rear direction by the supporting conveyance member, ie, the conveyance distance by the tenter, is always constant regardless of the expansion ratio.

(Example) An example of implementing the present invention will be explained with reference to the attached drawings.

In the drawing, 1 is a raw material film, 2 is a delivery roll for sending out the raw material film, 3 is a preheating roll for preheating the raw material film sent out by the delivery roll 2, and 4 is a raw material film 1 preheated by the preheating roll 3. The expanding tenter 5 is a cooling roll that cools the film that has been expanded and sent out from the tenter 4, and the film that has been cooled by the cooling roll 5 is wound onto a take-up roll 6.

The structure up to now is not particularly different from that known in the past, and the tenter 4 includes a supporting conveyance member 9 in which a chain 7 is provided with supporting pieces 8 for supporting both ends of the film 1, and both supporting conveyance members 9. The front end side and the rear end side are screwed together with screw rods 10, 11, so that the spacing between both support conveyance members 9 can be freely adjusted at the front end side and rear end side of both support conveyance members 9, respectively. There is no particular difference from the conventional example.

In such a device, the present invention provides support for each support member 9.
The front and rear sprockets 12, 12 around which the chain 7 constituting the chain 7 is spanned are supported by separate support frames 13, respectively, and at least one of the support frames 13 is movable relative to the other in the running direction of each chain 7. A support frame 13 is screwed onto each of the screw rods 10 and 11, and a sprocket 14 for tensioning the middle of each chain 7 is provided on a movable member 15 movable in the running direction of each chain 7, To explain this in more detail, the preheating roll 3 is installed near the floor, the cooling roll 5 is installed near the ceiling away from the floor, and there is an angle between the preheating roll 3 and the cooling roll 5. The tenter 4 was arranged so as to run upward.

Front and rear support frames 13, 1 support the front and rear sprockets 12, 12 around which the chain 7 is stretched.
3 is provided on support stands 16 provided on each side, movable in the running direction of the chain 7, and a guide rod 17 is provided between the support frame 13 on the front end side and the support frame 13 on the rear end side.
are interposed, and both support frames 13 are provided slidably along the guide rod 17, and each of the front and rear support frames 13 is screwed onto the screw rods 10, 11 screwed onto the support base 16. By appropriately rotating each threaded rod 10, 11, the distance between the front end side and the rear end side of both supporting and conveying members 9, 9 can be freely adjusted, and the movable member supports the sprocket 14 that pulls the middle of each chain 7. As 15, a pneumatic piston cylinder was used.

The chain 7 is provided so as to be movable along guide portions 18 provided on each support frame 13, 13, and the guide member 18 includes a guide member 18a that guides the top and bottom of the chain 7, and a guide that guides the side surface of the chain 7. The support piece 8 provided on the chain 7 is constructed by applying a pin sheet 8b on a plate piece 8a protruding inwardly from the inner end of the chain 7, and the outer end of the pin sheet 8b is Guide portion 18c formed on the upper surface of guide member 18b that guides chain 7
This prevents the film from digging into the chain 7 side.

In the drawing, 19 is a heater facing the upper and lower surfaces of the film being transported by the tenter 4, and 20 is a support frame 1 for fixedly supporting the guide rod 17.
A fixed frame supported by a support stand 16 is shown between 3 and 13.

Next, to explain the operation of the tenter, the screw rod 10 provided on the heating roll 3 side is rotated to adjust the distance between the supporting conveyance members 9 on the heating roll 3 side to 2000 mm to match the width of the film supplied from the supply roll 2. At the same time, the screw rod 11 is rotated to adjust the distance between the supporting and conveying members 9 on the side of the cooling roll 4 to a larger value of about 3700 mm to 6000 mm, thereby expanding the width of the film. At this time, when the distance of transporting the film by the chain 7 provided with the supporting piece 8 constituting the supporting conveying member 9 is constant, the more the degree of expansion of the film 1 increases, the supporting conveying member 9 constituting the tenter 5 increases. Therefore, the distance the film is transported becomes shorter. This results in a spacing between the preheating roll 3 or the cooling roll 5 if the distance between the preheating roll 3 and the cooling roll 5 is constant.

However, in the present device having the above-described configuration, when increasing the width expansion ratio, the support frame 13
moves in the running direction of the chain 7, opening the gap between the sprockets 12, 12 that span the chain 7, and the sprocket 14 on the moving member 15 advances by that amount, pulling the chain 7 stored there. Bring out. Therefore, the transport distance l in the front-rear direction by the support transport member 9, that is, the transport distance l by the tenter 4 is always constant regardless of the expansion ratio.

(Effect of the invention) As described above, according to the invention, the front and rear sprockets around which the chains constituting each supporting and conveying member are stretched are supported by the respective support frames provided on the supply side and the delivery side, and the support frames at least one of them is movable relative to the other in the running direction of each chain, and each support frame is screwed to each of the screw rods,
By providing a sprocket that pulls the middle of each chain 7 on a movable member that can move in the running direction of each chain, the conveyance distance in the front and rear direction by the tenter can be changed even if the expansion ratio of the tenter is increased. This creates a large gap between the tenter and the cooling roll or between the tenter and the preheating roll, which has the effect of eliminating the problem seen in conventional examples in which the film moves without being supported by anything. be.

[Brief explanation of the drawing]

Figure 1 shows one example of implementing the present invention.
2 is a plan view, FIG. 2 is a side view, FIG. 3 is an enlarged side view of a main part, and FIG. 4 is a sectional view taken along the line -- in FIG. 1... Raw material film, 3... Preheating roll, 4...
... tenter, 5 ... cooling roll, 7 ... chain,
8... Support piece, 9... Support conveyance member, 10, 11
...Screw rod, 12, 14...Sprocket, 13...
...Support frame, 15...Moveable member.

Claims (1)

[Scope of utility model registration request] The film supplied via the supply roll is supplied to a tenter via a preheating roll, and the film sent out from the tenter is wound onto a take-up roll via a cooling roll, and the tenter has a chain in each case. A support conveyance member provided with support pieces for supporting both ends of the film and both support conveyance members are screwed together on the film supply side and the film delivery side, so that the film supply side and the film discharge side of both support conveyance members are connected. In the structure in which the spacing between the supporting and conveying members can be freely adjusted, the front and rear sprockets around which the chains constituting each of the supporting and conveying members are stretched are supported by respective support frames provided on the supply side and the delivery side. and at least one of the support frames is movable relative to the other in the running direction of each chain, and each support frame is provided on a support base screwed into each of the threaded rods, and a sprocket is provided for pulling the middle of each chain. A film tenter provided on a movable member that is movable in the running direction of each chain.