JPS5968208A - Apparatus for narrowing clamp chain in resin sheet cutting and feeding apparatus of thermoforming machine - Google Patents

Abstract

PURPOSE:To transfer positively a sheet without causing the slip thereof, by providing clamp chains with movable sections and narrowing sections in conformity with the sheet width. CONSTITUTION:The resin sheet (a) is fed via a leading roll 4, a first feeding belt 5 that is run at the same speed as the extrusion speed, and a stepped section 7 to a second feeding belt 8 that is run approximately at same speed as that of the first feeding belt 5, and at the second feeding belt 8, the resin sheet (a) is allowed to be depend over the second feeding belt 8. The sheet selvages a1 are supported by an auxiliary belt 14, and then the sheet is delivered onto the sliding surfaces of clamping apparatuses by cams of the movable sections 19 of the clamp chains 18 that have been moved together with narrowing arms 23 by retraction of rods 22. When the delivering is finished, since the forward end of the cut resin sheet (a) comes below a narrowing position detecting phototube 16, it is detected thereby, and the second feeding belt is stopped. the sheet (a) can be delivered by the movable sections 19 and the narrowing sections 20 without changing the extent of the bent of the sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to a molding method called scraping molding, in which a resin sheet is molded at a relatively low temperature using a molding device. In the above molding method, partial deflection tends to occur during pressure molding of the resin sheet. Cut to length and bend in the +l+ direction in advance to prevent the uneven thickness mentioned above by moving the moving part of the crumb chain, which partially expands or narrows depending on the +l+ direction. This relates to the Clambutien 111/U device in the resin sheet cutting/feeding device of the ripening device.

a first feeding belt that continuously supplies the heat-softening resin sheet;
A second feed belt arranged to form a step of a required height between the first feed belt and the concave end thereof, and an intermittent conveyor belt installed on both sides of the second belt in the direction of the end and passed through a forming device. A continuous resin sheet cutting/feeding device consisting of a pair of driving uranium butenes and a cuckoo installed at the stepped portion is disclosed in Japanese Patent Application Laid-open No. 57-98459. There is no movable part for shifting, and the gap is widened (after receiving the cut resin sheet in the opposing part and clamping it, it passes through the part that narrows in the shape of a figure eight, and the part that passes through the molding device has a width of 11 inches/U). Therefore, the gap is narrowed, and the cut resin sheet is bent in the middle direction and fed to the molding device. It is not suitable for supplying resin sheets for stamping molding that cannot be expanded or contracted very much.In other words, Clambutien B clamps the resin sheet on both sides of the second feed belt and then narrows it into the figure eight shape as shown in Figure 1. Guide sprocket d, e widening interval corresponding to linear running part f
The projecting length of the clamp portion is 5th, because it moves from 1 to 4 to the diagonal running part g, and then to the straight running part 11 with a narrow distance between the 4th and 4th.
As shown in Figure 6, since the clamps are large, normally the distance 1'llA between the clamps C and C adjacent to each other shrinks and expands as shown in the distance 1i11tB and C when running around sprockets d and e.

For this reason, the clamping position of the resin sheet a, which has poor elasticity, slips and the sheet is stably bent in the straight running section 11, and cannot be bent and fed in the direction 111, so it is impossible to form! It has the disadvantage of causing errors in stamping molding using the A position.

The purpose of the present invention is to eliminate the above-mentioned diagonal traveling part g completely, and to add improvements to the other constituent parts so that they can be adapted to the hard resin sheet a, thereby eliminating the drawbacks of the above-mentioned known devices. be.

A preferred embodiment of the present invention will be described.

(2) is an extruder, and a resin sheet a having a predetermined thickness of 1+ is continuously conveyed from a 1゛-shaped nozzle 2 at a constant length every minute, and is sent out as a complete sheet. Although this extruded resin sheet a is at a high temperature of 200°C or more, it is cooled by passing it between the temperature rolls 3.3,
Furthermore, it hangs down from the guide roll 4. Said resin sheet a
In some cases, the material is wound around a winding shaft and heated to a temperature suitable for molding using a heating device as it is fed out. Reference numeral 5 denotes a first roller which receives continuous feeding of the resin sheet a hanging from the guide roll 4.
The feeding belt has a speed that is the same as or slightly faster than the feeding speed of the resin sheet a. Resin sheet a inside the belt
111 or more. The temperature of the resin sheet a fed to the first feeding belt 5 is relatively low at 120° C. to 140° C., and the thickness is approximately 1.5 nm.

Reference numeral 8 denotes a second feed belt that has a stepped portion 7 of a required height between it and the concave bent portion 6 at the end of the first feed belt 5, and is arranged so that a part thereof overlaps with the lower part of the first feed belt 5. te, that l+
is made a little smaller than +l of the resin sheet a, so that the edge edges a+ and at on both sides of the sheet protrude a little. A cuckoo C is provided opposite to the stepped portion 7.

The second feed belt 8 supports the shaft of the guide roll 9 at the rear end and the shaft of the guide roll 10 at the front end by a support frame 11. The shaft of the guide roll 10 is supported by the tip of the rod I3 of the sill 12, and normally it is kept horizontal by the extension of the rod 13, but the contraction of the rod 13 causes the support frame 11 to move around the axis of the guide roll 9. Together with the second feed belt 8, the front side can be freely moved downward along the tlIl line.

Inside the second feed belt 8 is an auxiliary belt 14 which pivotally supports guide rolls on the rear side and front 11tl+ by means of a support frame 11.
will be established. The auxiliary belt 14 has its rear end close to the above-mentioned guide roll 9, its front end significantly shorter than the entire length of the second feed belt 8, and the auxiliary belt 111 having both sides so large as to protrude to both outsides of the second feed belt 8. The upward running portions 1j of the second feed belt 8 and the auxiliary belt 14 are arranged so that they are in contact with each other vertically and overlap each other. al, a
+ will be received and paid.

The second feed belt 8 has a first feed speed that is almost the same as that of the first feed belt 5, a high speed that is more than double the first feed speed, and a running stop. a sheet cut position detection phototube 15 disposed oppositely on the top;
It is controlled by the sheet II and the shift position detection phototube 16.

With the front side of the auxiliary belt 14 of the second feeding belt 8 as the base point,
Molding equipment! A pair of clamp chains 18 are provided which are folded back in the horizontal direction on the front side of the clamp chain 117. each clanbutien 18
, there is a movable part 19 in a range slightly away from the front end of the belt 8 from the part approaching the tip of the auxiliary belt 14 of the second feeding belt 8, and this part is connected to the rod 22 of the shilling 21.
It is hung on the sprocket 24.25 which is pivotally supported by the front and rear l + slant arm 23 attached to the front and rear direction. The sprocket 26 slightly ahead of the sprocket 25 and the sprockets 27 and 28 provided at the folded part at the front end past the molding bag Wi17 are pivotally supported by the frame so that their positions cannot be moved, and the width of the sprocket 26 is narrower than the width of the resin sheet a. This is the gathering part 20. The corresponding spacing of the narrowing portions 20 remains unchanged.

The movable part 19 makes the inner running part wider than the middle extension part 20 by the contraction of the rod 22 as shown in FIG. Make it almost the same. The movable portion 19 of the rod 22 shown in FIG.
moves so that its inner side forms a straight line with the inner side of the centering portion 20 between the sprockets 26 and 27.

A total clamping device 9 attached to each link chain piece 18a or every other link chain piece 18a of the uranium butene 18
The bracket 30 has a sliding surface 31 on the upper surface of the protruding end of the resin sheet a, and the movable bracket 32 covers the sliding surface 31 and clamps the resin sheet a with the protruding tip 33. 30 horizontal axis 34
It has a known structure in which a spring 35 is applied between the bracket 30 and the movable bracket 32 to force the above-mentioned clamping, and a roll 36 is pivotally supported at the upper end of the movable bracket 32. In the present invention, it is necessary to unclamp the clamping device 29 all at once as shown in FIG. 6 or to clamp it as shown in FIG. In order to
As shown in the figure, cams 37 that move in unison are provided. 1, the cam 37 controls the entire clamping device 29 of the movable portion 19 to the clamped state shown in FIG. 5 by timely movement in the direction of the arrow in FIG.

The operation of this embodiment will be explained.

The resin sheet a, which is continuously extruded from the T-guidry 2 of the extruder 1 and whose temperature is adjusted to an appropriate temperature by the temperature control roll 3, passes through the induction roll 4 and then passes through the first feed belt 5, which runs at a speed almost equal to the extrusion speed. From there, it passes through the stepped portion 7 and is sent hanging down onto the second feed belt 8, which runs at a slow speed that is almost the same speed as the first feed belt 5. When the sheet cut position detection phototube 15 detects passage of the cutting front end of the sheet a,
Cuckoo C is activated by the sensing signal and the resin sheet a
is cut into a length suitable for feeding to the molding device 17, and upon completion of cutting, the feed belt 8 is switched to high-speed running, and the cut resin sheet is separated from the continuous resin sheet f and the other side by rapid feeding. .

At this time, the seat ears 1ia1, a+ are supported by the auxiliary belt 14 which is switched to high-speed travel at the same speed, and then the movable part of the clamp chain 18 moves to the position shown in FIG. 19,
As shown in Figure 6, the cam 37 moves the roll 3G to the spring 35.
The clamp device 29 moves in a direction against the elastic force of the clamp device 29 and is fed onto the sliding surface 31 of each clamp device 29 in an unclamped state.

At the end of the feeding, the tip of the cut resin sheet a comes under the middle position detection phototube 16, and the phototube 16
sends a detection signal, the second feed belt 8 stops, and the cam 3
7 in the direction of the arrow in FIG. 6, the extension of the rod 22 as shown in FIG. Therefore, the cutting resin sheet a is stopped, the movable part 19 of the soul sheet a is partially clamped as shown in FIG.
The second feed belt 8 and the auxiliary belt 14 are controlled to move in a straight line with the section 2o, and the movement of the second feed belt 8 and the auxiliary belt 14 as indicated by the chain lines in FIG.

As the movable part 19 moves in a straight line with the IIJ offset part 2o, the cut resin sheet a is bent in the IT direction as shown in FIG. 8, although it has a substantially flat shape as shown in FIG. In this case, the bending described above is made downward. At this time, while the second feed belt 8 moves downward and retreats together with the support frame 11, the bent resin sheet a is bent downward.
When the crumb chain 18 starts running, it is sent out in the direction of the molding device 17 without rubbing against the movable parts 19 and 11.
Since the first gathering portion 20 forms a straight line as shown in FIG. 3, the cut resin sheet (a) is sent to the molding device 17 without changing the amount of deflection, and is stopped together with the crumb chain 18.

On the other hand, as the rod 13 contracts, the second feed belt 8
Alternatively, the vehicle starts running at a slower speed together with the auxiliary belt 14 a little later than that. In addition, after the cut resin sheet a is transferred to the L + gathering part 20 of the crumb chain 18, the rod 13
The extension of the rod 22 and the contraction of the rod 22 are commanded. For this reason m2
The feed belt 8 etc. return to the horizontal position, and the movable part 19 returns to the position shown in FIG.
The new cut end of is placed on the m2 feed belt 8.

As clarified by the description of the above embodiments, the present invention provides a movable part 19 that matches or is narrower in width than 111 of the resin sheet a in the crumbbutien 18, and a middle part that is narrower than the width 111 of the resin sheet a. 20, the movable part 1
Since 9 has a configuration that causes a linear movement from a position matching the width of the resin sheet to 111/U portion 20,
After the resin sheet a is clamped at the ears Lta+, a+ by the movable part 19 with its original width as shown in FIG.
9 is deflected in the rlJ direction as shown in FIG.
It can be fed to the molding device I7 without causing the slip explained with reference to FIG. Also, the clamping device 2 of the movable part 19
9. By controlling the slow running, high speed running, and stopping of the second feed belt 8 while maintaining the relationship with the movable part 19, the molding temperature is particularly kept low to prevent expansion and contraction in the feeding direction. Although the present invention is suitable for scraping molding of resin sheet a, it can also be used in ordinary vacuum, compressed air, or dual-purpose sheet feeding devices for resin sheet molding.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a part of the known device to explain its shortcomings;
Figures 2 to 8 show embodiments of the present invention, and Figures 2.3 and 3 are plan views;
4 is a cutaway side view, FIG. 5.6 is a perspective view of the clamping device, FIG. 7 is a sectional view of the resin sheet a before gathering, and FIG. 8 is a state in which the sheet a is bent, It is a cross-sectional view of a deaf person. 5--First feed belt 7 part step part C-=cuckoo 8--Second feed belt 17--Forming device 18-Clambutien 19-Movable part 20--Inner part -1 part 22-Rod 23--Inner part Ze arm 29 - clamp device 36 -> roll 37 - -> cam section B.

Claims (1)

[Claims] a first feeding belt that continuously supplies the heat-softening resin sheet;
A second feed belt was placed on both sides of the second belt in the direction of its end, and passed through a forming device. It consists of a pair of intermittently driven clamp chains and a cuckoo installed at the n:J arrangement difference part, and the resin sheet sent out by the first feeding belt is cut into a length suitable for feeding to the molding device at the step part by a cutter. After cutting, the second feed belt is driven at high speed to sandwich the sheet edge edge between the uranium butene.
1. The movable part of the uranium butene is supported on both sides of the second feed belt by being supported by a cross section, and is provided so that the movable part of the uranium butene can be moved in a straight line with the 111 cross section of the uranium butene passing through the molding device. can be freely moved downwards,
The movable parts are made to correspond to both sides of the second transport belt until the cut resin sheet is completely conveyed by the second conveying belt, and the clamping device is in the released state, and at the same time when the conveying is finished, the clamping device is in the clamped state. and operates at 111 υ
A ripening method characterized by moving the cut resin sheet in a straight line with the section, bending the cut resin sheet in the l+ force direction and feeding it into the molding device, and at the same time moving the second feed belt downward to retract the cut resin sheet downward from the lower surface of the cut resin sheet. Clambutien 111 gathering device in the resin sheet cutting and feeding device of the molding device.