JP3387959B2 - Material supply device for injection molding machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material supply device for an injection molding machine capable of coloring resin.

[0002]

2. Description of the Related Art In a conventional material supplying device such as a material supplying device for an injection molding machine described in Japanese Patent Laid-Open No. 63-293026, a so-called natural material is used as a pigment, and a master as a pigment is used. Batch (hereinafter referred to as MB)
The desired coloring is performed by mixing the. Then, for example, when the lot of resin is different or when the type of resin is changed, the above-mentioned conventional material supply device stores the resin that has been used until then (hereinafter referred to as old resin) stored in the hopper. ) Is extracted and the resin to be used (hereinafter referred to as a new resin) is stored. The flow chart shown in FIG. 5 will be described below with respect to a supply procedure in the case where a new resin is stored in the hopper, MB is mixed with the new resin and supplied to the injection device when the resin is replaced in the conventional material supply apparatus. It will be explained with reference to FIG.

As shown in FIG. 5, for example, when a user of an injection molding machine performs an input operation by operating a switch, a button, or the like and gives an instruction to replace resin (S41), the control device of the material supply device is The old resin staying inside the hopper is removed by air purging or the like, and the inside of the hopper is cleaned (S42). When the cleaning of the inside of the hopper is completed, the hopper slider provided in the lower part of the hopper is closed and the new resin is stored in the hopper (S43). When a predetermined amount of new resin is stored in the hopper, the hopper slider is opened (S4
4), supply the new resin to the cylinder of the injection device (S4
5).

Next, when the screw of the cylinder starts to rotate by the drive of the screw motor (S46), the control device synchronizes with the start of the drive of the screw motor,
MB is supplied to the cylinder from the supply device (S47). Then, the new resin and MB are mixed and dispersed by rotation of the screw and melted, and a predetermined amount is injected into a mold from a nozzle provided at the tip of the cylinder to perform injection molding (S48).

[0005]

However, in the above-mentioned conventional material supply device for the injection molding machine, after the new resin is supplied to the cylinder of the injection device at S45, S4 is performed.
At 7, the MB is supplied to the cylinder from the MB supply device in synchronization with the start of driving the screw motor. Therefore, after replacing the resin, the new resin first supplied to the cylinder must be M
B will not be mixed.

Therefore, in the injection molding machine equipped with the above-mentioned conventional material supply device, for example, when the resin is replaced, MB is uniformly mixed and dispersed in the new resin, and the desired coloring is performed with good quality. Until the injection-molded article is obtained, so-called discarding, in which new resin without color is continuously discharged, must be repeated many times. The above discarding depends on the size of the material supply device, etc., but the new resin is 30 kg.
It is necessary to repeat the process until it is discharged to a certain degree, and the discarded new resin or the injection-molded product is defective because the coloring is insufficient. Therefore, the above-mentioned conventional material supply device has a problem that a large amount of new resin is wasted by the time the desired color is applied when the resin is replaced, and it takes a long time to discard the resin.

[0007]

According to a first aspect of the present invention, there is provided a material supply device for an injection molding machine, which is capable of coloring a resin in order to solve the above problems. The resin supply means for supplying resin to the injection device, the pigment supply means for supplying pigment to the injection device, and the pigment so that the pigment is supplied in synchronization with the start of the supply operation of the resin supply means. And a control means for controlling the supply means, and the pigment supply means is different.
Inside the weighing machine with multiple pigment tanks that store color pigments
Air blow used when removing and cleaning the pigment
It has a device and measures the pigment supplied from the pigment tank.
Weighing machine to measure and supply to the above injection device, and color change of resin
A funnel that collects the pigment that is sometimes withdrawn from the weighing machine,
Return the pigment collected in the funnel to the corresponding tank
A branching device for branching, and a branched pigment for the above pigment
It is characterized by having a return pipe for returning to the tank .

A material supply device for an injection molding machine according to a second aspect of the present invention is a material supply device for an injection molding machine capable of coloring a resin in order to solve the above problems. Resin supply means for supplying resin to the injection device, pigment supply means for supplying pigment to the injection device, and resin supply means and pigment supply device for supplying resin and pigment in synchronization with the start of the injection operation of the injection device. And a pigment supply means for controlling the means.
Steps are multiple pigment tanks that store pigments of different colors
And when removing the pigment from the weighing machine and cleaning it.
It has an air blower that is supplied and is supplied from the pigment tank.
Measuring machine for measuring the amount of pigment to be supplied to the above-mentioned injection device
The pigment extracted from the weighing machine when changing the color of the resin.
Applicable to the funnel to collect and the pigment collected in the funnel
The branching device, which branches off to return to the tank
And a return pipe for returning the pigment to the above pigment tank.
It is characterized by having.

[0009]

According to the first aspect of the invention, the resin supply means for supplying the resin to the injection device, the pigment supply means for supplying the pigment to the injection device, and the start of the supply operation of the resin supply means are synchronized with each other. Since the control means for controlling the pigment supply means so as to supply the pigment is provided, it is possible to supply the resin and the pigment to the injection device at the same time. Therefore, the pigment is mixed with the resin supplied to the injection device when the supply operation of the resin supply means is started.

As a result, when the resin is replaced, for example, the number of so-called discarding, which is performed until the pigment is uniformly mixed and dispersed in the newly supplied resin, can be reduced. Therefore, it is possible to reduce the amount of resin that is discarded by the time the desired coloring is performed, and it is possible to shorten the time for discarding until an injection-molded article of good quality is obtained.

According to the second aspect of the present invention, the resin supply means for supplying the resin to the injection device, the pigment supply means for supplying the pigment to the injection device, and the resin in synchronization with the start of the injection operation of the injection device. Further, since the resin supply means and the supply control means for controlling the pigment supply means are provided so that the pigment is supplied, it is possible to supply the resin and the pigment to the injection device at the same time. Therefore, the pigment is mixed with the resin supplied to the injection device when the injection operation of the injection device is started.

As a result, when the resin is replaced, for example, it is possible to reduce the number of times of so-called discarding, which is performed until the pigment is uniformly mixed and dispersed in the newly supplied resin. Therefore, it is possible to reduce the amount of resin that is discarded by the time the desired coloring is performed, and it is possible to shorten the time for discarding until an injection-molded article of good quality is obtained.

[0013]

【Example】

[Embodiment 1] One embodiment of the present invention will be described with reference to FIGS.
The explanation is based on the following.

The material supply device of the injection molding machine according to this embodiment mixes a so-called natural material, a white or colorless resin, with a masterbatch (hereinafter, referred to as MB) which is a pigment of this resin. As shown in FIG. 1, a suction hopper 1 having a substantially conical shape, and a charge having a substantially conical shape, which is provided below the suction hopper 1, can be colored. A hopper 2 and an MB supply device 3 are provided.

The suction hopper 1 is connected to a resin tank (not shown) via a supply pipe 1a. For example, a negative pressure is applied to the inside of the suction hopper 1 by a roots blower (not shown) so that the suction hopper 1 is connected to the resin tank. The filled resin is sucked and stored. A hopper slider 4 is provided at the connecting portion between the suction hopper 1 and the charge hopper 2 so as to be openable and closable, and the opening and closing operation thereof is controlled by a control device (not shown). The hopper slider 4 is opened when the resin is stored in the charge hopper 2, while the suction hopper 1 is opened.
It is closed when the resin is sucked into the cylinder or when the supply of the resin to the cylinder 20 described later is shut off.

The charge hopper 2 causes the resin supplied from the suction hopper 1 to pass through a throat 5 provided below the charge hopper 2 and a cylinder 20 of an injection device.
It is designed to be sequentially supplied to. Further, the charge hopper 2 is equipped with an air purging device (not shown) used when the resin inside is removed and cleaned, and a slider 2a is freely opened and closed at the connecting portion between the charge hopper 2 and the throat 5. It is provided. The slider 2a is normally closed while the slider 2a is closed together with the hopper slider 4 when the resin in the charge hopper 2 is removed. Therefore, when the hopper slider 4 is opened, the resin stored in the suction hopper 1 is transferred to the throat 5 via the charge hopper 2.
To be supplied to.

The throat 5 has a substantially cylindrical shape,
It is connected to a predetermined position of the cylinder 20. Further, the throat 5 is provided with a check ring (not shown) that prevents the reverse flow of the resin from the cylinder 20. The suction hopper 1, the charge hopper 2, the hopper slider 4, the throat 5 and the like constitute a resin supply means.

The MB supply device (pigment supply means) 3 includes a plurality of MB tanks 10 in which MBs of different colors are stored, a measuring machine 11 for measuring the capacity of MB mixed with resin, and the like. It is equipped with a charging hopper 12 for supplying the measured MB to the throat 5.
The direct injection method of mixing MB with resin is adopted. Then, the MB supply device 3 includes a plurality of MB tanks 1
Since 0 is provided, it is possible to change the color of the resin.

The MB tank 10 is opened when supplying the supply pipe 10a for supplying MB to the weighing machine 11 and MB, and is closed when MB is not supplied. The slider 10b has a slider 10c which is normally closed but is opened when MB in the MB tank 10 is extracted.

The weighing machine 11 includes a supply pipe 11a for supplying MB to the input hopper 12, a feeder 11b for pushing out the measured MB into the supply pipe 11a, and a weighing motor 11c for driving the feeder 11b, usually The MB inside the weighing machine 11 is closed while the color of the resin is changed.
A cock 11d that is opened when the plug is pulled out, and
It has an air blow device (not shown) used when extracting and cleaning the MB inside the weighing machine 11. The metering motor 11c is controlled by a control device (not shown) such as driving and stopping.

Each of the supply pipes 10a ... 11a is equipped with a pump (not shown) to measure the MB.
Also, air is pressure fed to the charging hopper 12. The above-mentioned pressure feeder is controlled by a controller (not shown) such as driving and stopping. Further, the pressure feeder is provided with a timer or the like, and the air pressure feeding time can be adjusted so that MB does not remain in the supply pipes 10a ... The number of MB tanks 10 ... Is not particularly limited.

Below the cock 11d, there is a funnel 14 for collecting the MB taken out from the weighing machine 11 when the color of the resin is changed, and for returning the MB collected by the funnel 14 to the corresponding MB tank 10. Branching device 1
5, and return pipes 15a for returning the branched MB to the MB tanks 10 are provided. Further, the return pipes 15a ... Are each provided with a pressure feeder (not shown) so that the branched MBs are pneumatically fed to the MB tanks 10. In this way, the MB supply device 3
Collects MB that is extracted when changing the color of the resin,
It is designed to be returned to the MB tank 10 ... Again.

The charging hopper 12 has a charging port 12a at a predetermined position in the axial center portion of the throat 5. Therefore, the MB supplied from the inlet 12a to the throat 5 is
The resin supplied from the charge hopper 2 to the throat 5 is poured into the central portion in a substantially concentric shape. still,
The inlets 12a are provided above the cylinder 20 at intervals of, for example, about 10 cm.

The cylinder 20 has a screw 21 inside, and the screw 21 can be moved forward and backward by being rotationally driven by a screw motor (not shown). The cylinder 20, the screw 21, the screw motor, and the like constitute an injection device.

In the above-mentioned injection device, the resin supplied from the charge hopper 2 to the cylinder 20 by a predetermined amount via the throat 5 and the MB supplied from the charging port 12a to the cylinder 20 by a predetermined amount are rotated by the screw 21. mixture·
It is dispersed and melted while being sent to the tip of the cylinder 20. Then, the injection device applies the molten resin to the cylinder 20.
After sending the molten resin to the tip, the screw 21 is retracted, and then the screw 21 is moved forward by driving the screw motor, so that the molten resin is discharged from the nozzle provided at the tip of the cylinder 20 into a mold (neither is shown). A predetermined amount is injected into the inside.

The control device (control means) controls the operations of the hopper slider 4, the weighing motor 11c of the weighing machine 11 and the respective pressure feeders, and at the same time, the roots blower of the suction hopper 1 and the slider 2a of the charge hopper 2.
The air purging device, the sliders 10b ... 10c of the MB tank 10, the cock 11d of the weighing machine 11, the air blow device, the branching device 15, and the like are controlled to operate.

In the material supplying apparatus having the above-mentioned structure, for example, when the lot of resin is different, when the type of resin is changed, when MB is replaced with another color, etc., it is stored in the charge hopper 2, the weighing machine 11 or the like. The resin and MB that have been used until then are extracted, and the resin and MB that will be used from now on are supplied and stored. Below, in the material supply device having the above-mentioned configuration, the resin and M
At the time of exchanging B, the resin and MB to be used from now on will be described with reference to the flow charts shown in FIG. 2 and FIG. 3 regarding the supply procedure in which the charge hopper 2, the weighing machine 11 and the like are supplied and stored and supplied to the cylinder 20. To do.

First, as shown in FIG. 2, when the user of the injection molding machine operates a switch or button (not shown) to perform an input operation to instruct color change, that is, MB replacement (S1), The control device uses the slider 10 of the MB tank 10 in the MB supply device 3 in which the MB that has been used until now (hereinafter referred to as the old MB) is stored.
b is closed (S2).

Next, by opening the cock 11d of the weighing machine 11 and blowing air with the air blower,
The old MB staying inside the weighing machine 11 is extracted and the inside of the weighing machine 11 is cleaned (S3). Subsequently, the MB that will be used in the future (hereinafter referred to as the new MB) is stored in the M
Open the slider 10b of the B tank 10 (S
4) By air-feeding the new MB with a pressure feeder,
It is supplied to the weighing machine 11 via the supply pipe 10a (S5).
After that, input the new MB such as weighing the new MB into the hopper 12,
That is, preparation for supplying to the throat 5 is performed, and when the above preparation is completed (S6), the MB supply device 3 enters a standby state (S7).

On the other hand, as shown in FIG. 3, for example, when a user of the injection molding machine performs an input operation by operating a switch, a button or the like, and gives an instruction to replace the resin (S11),
The controller keeps the hopper slider 4 open, the slider 2a closed, and performs air purging with an air purging device to retain the resin inside the suction hopper 1 and the charge hopper 2 which has been used until then ( Hereinafter, the resin is called "old resin", and the inside of the suction hopper 1 and the inside of the charge hopper 2 are cleaned (S12). When the cleaning of the insides of both hoppers 1 and 2 is completed, the hopper slider 4 is closed and the slider 2a is opened (S13).

Next, a resin to be used (hereinafter referred to as a new resin) is sucked by a roots blower to be supplied to the suction hopper 1 through the supply pipe 1a, and the new resin is stored in the suction hopper 1. Then, the hopper slider 4 is opened (S14), and new resin is supplied to the charge hopper 2 (S15). Then, the control device drives the weighing motor 11c of the weighing machine 11 in the MB feeding device 3 which is in the standby state in S7, in synchronization with the start of the feeding operation in which the hopper slider 4 is opened.
After the already measured new MB is pushed out into the supply pipe 11a by the feeder 11b, the new MB is pneumatically fed by the pressure feeder to be supplied to the feeding hopper 12 through the supply pipe 11a (S16). . Therefore, the above S15
And the operation of S16, new resin and new MB are simultaneously supplied to the cylinder 20 via the throat 5 (S1
7).

Thereafter, the screw 21 of the cylinder 20 starts to rotate by driving the screw motor (S1
8). As a result, the injection device mixes and disperses the new resin and the new MB by the rotation of the screw 21 and melts them, and injects each predetermined amount into the mold from the nozzle provided at the tip of the cylinder 20 for injection molding. Perform (S19).
In addition, new resin and new M in injection molding after the second time
The supply of B is performed corresponding to the rotation of the screw 21 of the cylinder 20.

As described in S16, the control device drives the weighing motor 11c of the weighing machine 11 in synchronization with the start of the feeding operation in which the hopper slider 4 is opened. Therefore, the MB supply device 3 is set to the standby state of S7 described above before the hopper slider 4 is opened in S15. Further, the instruction to replace the MB in S1 and the instruction to replace the resin in S11 may be given at the same time or separately. Furthermore, the operations of S1 to S7 may be performed prior to the operations of S11 to S14, or may be performed in parallel.

Furthermore, in the above description, the supply procedure for supplying / storing the new resin and new MB to the charge hopper 2, the weighing machine 11, etc. and supplying them to the cylinder 20 at the time of exchanging the resin and MB is described. However, for example, M
Even when only the resin is replaced without replacing B, or when only the MB is replaced without replacing the resin, the control unit uses the new resin or new MB in the same supply procedure as above.
Are supplied to the cylinder 20. That is, also in these cases, the control device drives the weighing motor 11c of the weighing machine 11 in synchronization with the start of the supply operation in which the hopper slider 4 is opened.

As described above, the material supply device for the injection molding machine according to the present embodiment is provided with the resin supply means such as the suction hopper 1, the charge hopper 2, the hopper slider 4 for supplying the resin to the cylinder 20, and the cylinder 20. The MB supply device 3 for supplying the MB and the metering motor 11c of the weighing machine 11 in the MB supply device 3 are arranged so that the MB is supplied in synchronization with the start of the supply operation in which the hopper slider 4 is opened. Since the control device (not shown) for driving is provided, it is possible to supply the resin and the MB to the cylinder 20 at the same time. Therefore, at the start of the feeding operation in which the hopper slider 4 is opened, the cylinder 2
MB is also mixed with the resin supplied to 0.

As a result, for example, when the resin or MB is replaced, it is possible to reduce the number of times of so-called discarding, which is carried out until the MB is uniformly mixed and dispersed in the newly supplied resin. Therefore, it is possible to reduce the amount of resin that is discarded by the time the desired coloring is performed, and it is possible to shorten the time for discarding until an injection-molded article of good quality is obtained. It should be noted that the above discarding may be repeated until the newly supplied resin is discharged by about 8 kg, though it depends on the size of the material supply device and the like.

In the above embodiment, the control device drives the weighing motor 11c of the weighing machine 11 in synchronization with the start of the feeding operation in which the hopper slider 4 is opened. Instead of the configuration, the weighing motor 11c of the weighing machine 11 may be driven in synchronization with the start of the supply operation in which the slider 2a of the charge hopper 2 is opened. In this case, the slider 2a of the charge hopper 2 is opened when the resin is supplied to the throat 5, while the slider 2a of the charge hopper 2 is shut off when the resin is supplied to the throat 5 or the resin inside the charge hopper 2 is removed. , Closed when cleaning.

[Embodiment 2] Another embodiment of the present invention will be described below with reference to FIG. For convenience of explanation, members having the same functions as those shown in the drawings of the first embodiment will be designated by the same reference numerals, and the description thereof will be omitted.

The control device (supply control means) in the material supply device of the injection molding machine according to this embodiment is the screw 2
An operation detecting means (not shown) for detecting an operation such as driving and stopping of the screw motor 1 is provided. Then, the control device, based on the detection result of the above-mentioned operation detection means, the hopper slider 4 and the weighing motor 11 of the weighing machine 11.
c, the operation of each member of the material supply device such as the pressure feeder is controlled. The other components are the same as those of the material supply device of the injection molding machine of the first embodiment.

In the material feeding apparatus having the above-mentioned structure, the charge hopper 2 and the weighing machine 11 are used when the resin and MB are exchanged.
Cylinder 20 that supplies and stores new resin and new MB to
The supply procedure in the case of supplying to the following will be described below with reference to the flowchart shown in FIG.

First, for example, when the user of the injection molding machine performs an input operation and gives an instruction to replace the MB, the control device performs the same operation as that of the first embodiment and puts the MB supply device 3 in the standby state. .

On the other hand, as shown in FIG. 4, for example, when the user of the injection molding machine performs an input operation and gives an instruction to replace the resin (S21), the control device opens the hopper slider 4 and closes the slider 2a. Then, the old resin is removed by air purging with an air purging device, and the inside of the suction hopper 1 and the inside of the charge hopper 2 are cleaned (S
22) When the cleaning inside the hoppers 1 and 2 is completed, the hopper slider 4 is closed and the slider 2a is opened (S23).

Next, the new resin is sucked by a roots blower to be supplied to the suction hopper 1 through the supply pipe 1a and stored (S24). Then, when the screw 21 of the cylinder 20 starts to rotate by driving the screw motor (S25), the driving of the screw motor is detected by the operation detecting means, and the control device detects the rotation of the screw 21 based on the detection result. In synchronization with the start of the injection operation, the hopper slider 4 is opened and new resin is supplied to the charge hopper 2 (S26).
Weighing machine 1 in MB supply device 3 in standby state
The metering motor 11c of No. 1 is driven to supply the new MB to the supply pipe 11a.
It is supplied to the input hopper 12 via (S27). Therefore, the new resin and new MB are simultaneously supplied to the cylinder 20 through the throat 5 by the operations of S26 and S27 (S28).

After that, the injection device was changed to new resin and new MB.
Is mixed and dispersed by the rotation of the screw 21 and melted, and a predetermined amount is injected into a mold from a nozzle provided at the tip of the cylinder 20 to perform injection molding (S2).
9).

As described above, the material supply device for the injection molding machine according to the present embodiment is provided with the resin supply means such as the suction hopper 1, the charge hopper 2, the hopper slider 4 for supplying the resin to the cylinder 20, and the cylinder 20. MB supply device 3 for supplying MB and resin and M in synchronization with the start of the injection operation by the rotation of the screw 21 of the cylinder 20 described above.
Since the hopper slider 4 is opened so that B is supplied, and a control device (not shown) that drives the weighing motor 11c of the weighing machine 11 in the MB feeding device 3 is provided, It is possible to simultaneously supply the resin and the MB. Therefore, MB is also mixed with the resin supplied to the cylinder 20 at the start of the injection operation by the rotation of the screw 21.

This makes it possible to reduce the number of so-called discarding operations that are carried out until the MB is uniformly mixed and dispersed in the newly supplied resin when the resin or MB is replaced, for example. Therefore, it is possible to reduce the amount of resin that is discarded by the time the desired coloring is performed, and it is possible to shorten the time for discarding until an injection-molded article of good quality is obtained. It should be noted that the above discarding may be repeated until the newly supplied resin is discharged by about 8 kg, though it depends on the size of the material supply device and the like.

[0047]

As described above, the material supply device for the injection molding machine according to the first aspect of the present invention comprises the resin supply means for supplying the resin to the injection device and the pigment supply means for supplying the pigment to the injection device. And a control means for controlling the pigment supply means so that the pigment is supplied in synchronization with the start of the supply operation of the resin supply means, and the pigment supply means
Is a plurality of pigment tanks that store pigments of different colors,
Used when removing and cleaning the pigment inside the weighing machine
It has an air blower and is supplied from the pigment tank.
A measuring machine for measuring the pigments to be supplied to the injection device,
Collect the pigment extracted from the weighing machine when changing the color of fat
The funnel and the pigment collected in the funnel are
Branching device for branching back to the tank, and branched pigment
And a return pipe for returning the
It is a configuration that.

Therefore, it is possible to supply the resin and the pigment to the injection device at the same time, so that the pigment is mixed with the resin supplied to the injection device when the supply operation of the resin supply means is started. . As a result, for example, when the resin is replaced, the number of so-called discarding, which is performed until the pigment is uniformly mixed and dispersed in the newly supplied resin, can be reduced. Therefore, it is possible to reduce the amount of resin that is discarded by the time the desired coloring is performed, and it is possible to shorten the time for discarding until an injection-molded product of good quality is obtained. .

As described above, the material supply device for the injection molding machine according to the second aspect of the present invention comprises the resin supply means for supplying the resin to the injection device, and the pigment supply means for supplying the pigment to the injection device. When and a supply control means for controlling the resin supply means and the pigment supply means so as to synchronize the injection start of operation of the injection device is a resin and a pigment are supplied
In both cases, the pigment supply means stores pigments of different colors.
Multiple pigment tanks and the pigment inside the weighing machine
Have an air blower used for cleaning.
2.Measure the pigment supplied from the pigment tank and inject it.
From the weighing machine that supplies the equipment and when changing the color of the resin
With the funnel that collects the pigment that is extracted and the above funnel
Branch to return the collected pigment to the corresponding tank
Branching device and returning the branched pigment to the above pigment tank
And a return pipe for storing .

Therefore, it is possible to supply the resin and the pigment to the injection device at the same time, so that the pigment is mixed with the resin supplied to the injection device when the injection operation of the injection device is started. As a result, for example, when the resin is replaced, the number of so-called discarding, which is performed until the pigment is uniformly mixed and dispersed in the newly supplied resin, can be reduced. Therefore, it is possible to reduce the amount of resin that is discarded by the time the desired coloring is performed, and it is possible to shorten the time for discarding until an injection-molded product of good quality is obtained. .

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a material supply device according to an embodiment of the present invention.

FIG. 2 is a flow chart showing a supply procedure at the time of MB exchange in the material supply device.

FIG. 3 is a flowchart showing a supply procedure at the time of resin exchange in the material supply device.

FIG. 4 is a flowchart showing a supply procedure at the time of resin exchange of the material supply device in another embodiment of the present invention.

FIG. 5 is a flowchart showing a supply procedure at the time of resin exchange in the conventional material supply device.

[Explanation of symbols]

1 Suction hopper (resin supply means) 2 Charge hopper (resin supply means) 3 MB supply device (pigment supply means) 4 Hopper slider (resin supply means) 5 throat (resin supply means) 10 MB tank 11 Weighing machine 11c Weighing motor 12 Input hopper 12a input port 20 cylinders (injection device) 21 screw (injection device)

Claims (2)

(57) [Claims] 1. A material supply device for an injection molding machine capable of coloring a resin, comprising: a resin supply means for supplying a resin to the injection device; and a pigment supply means for supplying a pigment to the injection device. together and a control means for controlling the pigment supply means as pigments in synchronization with the supply operation start of the resin supply means is supplied, the pigment supply means, a plurality of storing pigments of different colors Used to remove and clean the pigment tank inside and the pigment inside the weighing machine.
It has an air blower and is supplied from the pigment tank.
A weighing machine that measures the amount of pigment that is supplied to the above-mentioned injection device and a pigment that is withdrawn from the weighing machine when changing the color of the resin.
Back the funnel and the pigment collected in the funnel to the corresponding tank.
And a return device for returning the branched pigment to the pigment tank.
A material supply device for an injection molding machine, comprising: a pipe . 2. A material supply device of an injection molding machine capable of coloring a resin, the resin supply means supplying the resin to the injection device, and the pigment supply means supplying the pigment to the injection device. together and a supply control means for controlling the resin supply means and the pigment supply means so as to synchronize the injection start of operation of the injection device is a resin and a pigment are supplied, the pigment supply means, different color Used to remove and clean multiple pigment tanks that store pigment and the inside of the weighing machine.
It has an air blower and is supplied from the pigment tank.
A weighing machine that measures the amount of pigment that is supplied to the above-mentioned injection device and a pigment that is withdrawn from the weighing machine when changing the color of the resin.
Back the funnel and the pigment collected in the funnel to the corresponding tank.
And a return device for returning the branched pigment to the pigment tank.
A material supply device for an injection molding machine, comprising: a pipe .