JPH0422971Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a feeding device for feeding a thermoplastic resin sheet to a molding machine, and more specifically, a feeding device for feeding a thermoplastic resin sheet to a molding machine. The present invention relates to a thermoplastic resin sheet feeding device that can automatically start feeding the next thermoplastic resin sheet at certain times.

[Prior Art] A thermoplastic resin sheet wound into a roll has conventionally been used as a molding material for various resin products. In this case, in order to perform the molding operation efficiently, it is necessary to start feeding the next thermoplastic resin sheet without delay immediately before the thermoplastic resin sheet in use is used up.

Therefore, in the past, workers usually stacked and supported the starting end of the thermoplastic resin sheet to be used next several minutes before the thermoplastic resin sheet in use ran out. Then, the starting end of the thermoplastic resin sheet to be used next is overlapped with the ending end of the thermoplastic resin sheet in use, and the sheet is fed to a sheet and supply member such as a conveyor.

[Problem that the invention attempts to solve]

However, according to the above conventional method, it is necessary to constantly check the remaining amount of thermoplastic resin sheet during molding work, and the thermoplastic resin sheet must be checked several minutes before the thermoplastic resin sheet in use runs out. There was a complication in that a worker had to stand by while supporting the next thermoplastic resin sheet in preparation for handover. Moreover, since the transfer of two thermoplastic resin sheets is carried out manually, the length of the overlapping part of the thermoplastic resin sheets may become uneven, and the new thermoplastic resin sheet may not be aligned in the direction of travel. This has led to problems such as the molding machine being introduced in an awkward position, or failure to transfer two thermoplastic resin sheets, forcing the molding operation to be interrupted.

[Means for solving problems]

In order to solve the above problems, the thermoplastic resin sheet feeding device according to the present invention includes a feeding means for feeding a thermoplastic resin sheet to a molding machine, and detects the terminal end of the thermoplastic resin sheet being fed. a detection means, a holding means for stopping and holding the next thermoplastic resin sheet to be supplied at a position where its starting end is opposed to the thermoplastic resin sheet being supplied in front of the supplying means, and a holding means for stopping and holding the thermoplastic resin sheet to be supplied next; a pressing means that presses the starting end of the plastic resin sheet against the currently supplied thermoplastic resin sheet to introduce the starting end of the next supplied thermoplastic resin sheet into the supplying means together with the currently supplied thermoplastic resin sheet; and a detecting means and control means for causing the pressing means to press the starting end of the next thermoplastic resin sheet to be supplied onto the thermoplastic resin sheet being supplied when the controller detects the terminal end of the thermoplastic resin sheet being supplied. That is.

[Effect]

According to the above configuration, the next thermoplastic resin sheet to be supplied is held by the holding means in a state facing the thermoplastic resin sheet being supplied, and when the thermoplastic resin sheet being supplied runs out, the pressing means is used to hold the thermoplastic resin sheet to be supplied next. Since the next thermoplastic resin sheet is pressed against the currently supplied thermoplastic resin sheet and fed into the supply means in an overlapping state, the transfer of two thermoplastic resin sheets can be automatically carried out without requiring any human intervention. It becomes like this.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

As shown in FIG. 1, the thermoplastic resin sheet feeding device includes a front frame 1 and a rear frame 2. As shown in FIG. On the front frame 1, there are a thermoplastic resin sheet 3a being supplied to a molding machine (not shown), and an unused thermoplastic resin sheet to be supplied to the molding machine after the thermoplastic resin sheet 3a is used. 3b is supported. As each thermoplastic resin sheet 3a, 3b, a foamed polystyrene sheet with a thickness of about 2 to 3 mm is used, for example.
It is wound into a roll on a and 4b. The ends of each core tube 4a, 4b are rotatably supported by support members 5a, 5b placed on the front frame 1.

Above the rear frame 2, a pair of guide pipes 6a, 6b for guiding the thermoplastic resin sheet 3a are installed laterally at a predetermined distance from the rear frame 2. At the rear of the guide pipes 6a, 6b, a conveyor 7, which serves as a supply means and has a large number of needles 7a, 7a protruding from its surface, is installed.
The conveyor 7 is adapted to supply the thermoplastic resin sheet 3a to the above-mentioned molding machine via a heating machine (not shown). At a position facing the conveyor 7, the thermoplastic resin sheet 3a is urged toward the conveyor 7 side, and the needles 7a, 7a of the conveyor 7 are connected to the thermoplastic resin sheet 3a.
A biasing roller 8 is rotatably arranged to pierce.

As shown in FIG. 2, a pair of pillars 9 and 10 are vertically installed on the front frame 1, and three square pipes 11 to 13 are vertically arranged between the pillars 9 and 10. They are installed horizontally at predetermined intervals. The end of the lowermost square pipe 13 on the support 9 side is rotatably supported by the support 9 in a vertical plane by a pin 14, and the end of the square pipe 13 on the support 10 side is
It is biased upward by a spring 15 whose one end is supported by the square pipe 12. A rotating member 16 is rotatably supported by a pin 17 on the column 10, and a pin 18 provided eccentrically from the pin 17 on the rotating member 16 is attached to the end of the square pipe 13 on the column 10 side by a rod member 20. is connected to. Then, when the rotating member 16 is rotated, the rod member 20
moves up and down, and along with this, the square pipe 13 touches the pin 1.
It is designed to rotate around 4 as a fulcrum.

The left and right pair of air cylinders 21 and 22 are supported at their upper ends by the square pipe 12 so as to be movable along the square pipe 12.
1 and 22, driving air is supplied and discharged by air hoses 23 to 26 passing through the square pipe 11. Adjacent to each air cylinder 21, 22, upper end portions of a pair of left and right support members 27, 28 are supported by the square pipe 12 so as to be movable along the square pipe 12.

A pair of left and right holding arms 30 as holding means,
31 is rotatably supported at its intermediate portion by support members 27 and 28, respectively. Holding arm 3
One end of each air cylinder 21, 2
The holding arms 30 and 31 are rotatably connected to the piston rods 21a and 22a of FIG. ) can be held.

As shown in FIGS. 1 and 3, the guide pipes 6a and 6b above the rear frame 2 and the conveyor 7
A support shaft 32 is horizontally installed at a distance from the rear frame 2, and a pair of left and right arms 33, 34 are swingably mounted on this support shaft 32. It is supported movably in the axial direction of the shaft 32. Each arm 33, 34 rotatably supports a pair of pressing rollers 35, 36 as pressing means capable of pressing the thermoplastic resin sheet 3b to be used next time. A rod 37 extending laterally is inserted through the front end of each arm 33, 34, and both arms 33, 34 swing simultaneously in response to the vertical movement of the rod 37. The rod 37 is connected to the piston rod 42 of the air cylinder 42 via a wire 41 guided by pulleys 38 and 40.
a, and the rod 37 is connected to the air cylinder 42.
It is configured so that it can be moved up and down.
This air cylinder 42 has an air hose 43,
Driving air is supplied and discharged from 44. Note that the arms 33 and 34 are normally press rollers 35 and 3.
6 and the rear frame 2 are held in a position where a predetermined distance is provided between the rear frame 2 and the rear frame 2.

A phototube 45 is installed at the front of the rear frame 2 as a detection means for detecting passage of the terminal end of the thermoplastic resin sheet 3a. photocell 4
5, the terminal end 3a' of the thermoplastic resin sheet 3a has a downward bend;
When a' passes through the phototube 45, the phototube 45 is covered by the terminal end 3a' as shown by the dotted line in FIG. 1, and the amount of light incident on the phototube 45 is reduced. It is configured to detect the portion 3a'. A control means (not shown) controls the arms 33, 34 by means of an air cylinder 42 immediately or after a predetermined period of time when the phototube 45 detects the end of the thermoplastic resin sheet 3a.
is swung in the direction A in FIG.
Thermoplastic resin sheet 3b to be used next by 36
The starting end of the thermoplastic resin sheet 3a is pressed onto the thermoplastic resin sheet 3a.

In the above configuration, the thermoplastic resin sheet 3a
When molding various resin products, when the thermoplastic resin sheet 3a is inserted between the conveyor 7 and the biasing roller 8, the thermoplastic resin sheet 3a is pressed against the needles 7a,
The molding machine is supplied to the molding machine via the heating machine while being stuck and held by the molding machine 7a, and molding is performed. and,
At some point during the molding operation using the thermoplastic resin sheet 3a, the thermoplastic resin sheet 3b to be used next is set in the supply preparation position.

That is, the thermoplastic resin sheet 3 to be used next
When setting B to the supply preparation position, when the rotating member 16 is rotated in the direction B around the pin 17 in FIG. Due to the biasing force of the spring 15, the square pipe 13 rotates in the C direction about the pin 14, and a gap is generated between the square pipe 13 and the holding arms 30, 31. In this state, the starting end of the thermoplastic resin sheet 3b to be used next time is passed through the gap between the square pipe 13 and the holding arms 30, 31, and further,
With the starting end of the thermoplastic resin sheet 3b superimposed on the thermoplastic resin sheet 3a in use, the pressure rollers 35, 36 are applied via guide pipes 6a, 6b.
In other words, insert it to the position just before the conveyor 7. Then, when the rotating member 16 is rotated in the reverse B direction, the square pipe 13 is rotated in the reverse C direction around the pin 14 as the rod member 20 moves downward, and the thermoplastic resin sheet to be used next time is 3b is held in a stopped state by being held between the square pipe 13 and the holding arms 30, 31 with its starting end located below the pressing rollers 35, 36.

After that, the thermoplastic resin sheet 3a is almost used up and the phototube 45 is removed from the thermoplastic resin sheet 3a.
When the terminal end 3a' of the air cylinder 2 is detected, the control means immediately thereafter or after a predetermined period of time has elapsed, controls the air cylinder 2.
By driving each piston rod 21a, 22a of 1, 22 upward, each holding arm 30, 3
1 in directions D and D' to release the holding operation of the thermoplastic resin sheet 3b to be used next time. At the same time, the control means moves the piston rod 42a of the air cylinder 42 downward to move the rod 37 upward, thereby rotating the arms 33 and 34 in the A direction. As a result, the pressing rollers 35 and 36 press the starting end of the thermoplastic resin sheet 3b to be used next time onto the terminal end of the thermoplastic resin sheet 3a in use, so that the starting end of the thermoplastic resin sheet 3b to be used next time is The thermoplastic resin sheet 3a is pulled against the end of the thermoplastic resin sheet 3a in use by the frictional force and introduced into the conveyor 7, where the molding operation is continued. After that, the air cylinders 21, 2
2 and the holding arm 3 by the air cylinder 42.
0, 31 and pressing rollers 35, 36 are returned to their original positions. Note that the length of the overlapping portion between the thermoplastic resin sheet 3a in use and the thermoplastic resin sheet 3b to be used next time is set to, for example, about 30 to 50 cm.

Next, at an appropriate time after the thermoplastic resin sheet 3b is introduced into the conveyor 7, the roller-shaped winding portion of the thermoplastic resin sheet 3b is moved to the rear position on the front frame 1, and a new heat source is applied. A plastic resin sheet is placed on the front frame 1, and its starting end is set at the supply preparation position.

Note that the air cylinders 21, 22 and the pressure rollers 35, 36 are movable along the square pipe 12 and the support shaft 32, respectively, so the air cylinders 21, 22 are moved according to the width dimension of the thermoplastic resin sheet 3b. And the positions of the pressing rollers 35 and 36 can be adjusted as appropriate.

[Effect of idea]

As described above, the thermoplastic resin sheet feeding apparatus according to the present invention includes a feeding means for feeding a thermoplastic resin sheet to a molding machine, a detecting means for detecting the terminal end of the thermoplastic resin sheet being fed, and a a holding means for stopping and holding a thermoplastic resin sheet to be supplied to the thermoplastic resin sheet with its starting end facing the thermoplastic resin sheet being fed at a position in front of the feeding means, and a starting end of the thermoplastic resin sheet to be fed next; a pressing means for introducing the starting end of the next thermoplastic resin sheet into the supply means together with the thermoplastic resin sheet being supplied by pressing a portion of the thermoplastic resin sheet against the thermoplastic resin sheet being supplied; The present invention is configured to include a control means for causing the pressing means to press the starting end of the next supplied thermoplastic resin sheet against the currently supplied thermoplastic resin sheet when the terminal end of the plastic resin sheet is detected.

This makes it possible to automatically transfer two thermoplastic resin sheets without requiring manual intervention, so you can constantly check the remaining amount of thermoplastic resin sheets during molding work, and When the quantity is low, the worker can hold the thermoplastic resin sheet to be used next and prepare for handover.
Further, the labor of manually transferring the thermoplastic resin sheets can be saved, resulting in improved workability.

Further, the length of the overlapping portion of the two thermoplastic resin sheets becomes approximately constant, and the thermoplastic resin sheet to be used next can be introduced into the supply means along the sheet conveyance direction.

Furthermore, since the thermoplastic resin sheet can be reliably transferred without failure, there is also the effect that interruptions in the molding operation can be eliminated.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a schematic side view, FIG. 2 is a schematic view taken along the E-E direction of FIG. 1, and FIG. F- in Figure 1
FIG. 2 is a schematic view taken in the F direction. 3a and 3b are thermoplastic resin sheets, 7 is a conveyor (supplying means), 30 and 31 are holding arms (holding means), 35 and 36 are pressure rollers (pressing means), 4
5 is a phototube (detection means).

Claims (1)

[Scope of utility model registration request] A supply means for supplying a thermoplastic resin sheet to a molding machine, a detection means for detecting the terminal end of the thermoplastic resin sheet being supplied, and a detection means for detecting the starting end of the thermoplastic resin sheet to be supplied next at a position in front of the supply means. holding means for stopping and holding the thermoplastic resin sheet in a state facing the thermoplastic resin sheet being supplied; Pressing means introduces the starting end of the thermoplastic resin sheet into the supplying means together with the thermoplastic resin sheet being supplied, and heat that is then supplied by the pressing means when the detecting means detects the terminal end of the thermoplastic resin sheet being supplied. 1. A thermoplastic resin sheet feeding device comprising: a control means for pressing a starting end of the plastic resin sheet against the thermoplastic resin sheet being fed.