JPH042023Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The invention relates to a raw material supply device for an injection molding machine, and in particular, the present invention relates to a raw material supply device for an injection molding machine. This invention relates to a device for selectively feeding a main screw.

(Prior Art) In the operation of an injection molding machine, it is required to prepare two types of raw materials, mold a certain amount of the raw materials, and then switch to another type of raw material for molding. For this reason, conventionally two raw material supply hoppers are provided in one injection molding machine to shorten the setup time for changing raw materials.

(Problems to be solved by the invention) This invention does not supply raw materials by letting them naturally fall from the raw material hopper to the main screw, but instead uses the raw material supply port of the heating cylinder into which the raw material hopper and the main screw are inserted. An attempt was made to adopt a method of supplying raw materials by installing a feed screw device between them to adjust the amount of raw material supplied, but the drive mechanism for driving the two feed screws became complicated.

(Means for solving the problem) Therefore, the present invention attempts to solve the problem by the following means.

In other words, in a pair of raw material supply devices that supply a predetermined amount of raw material from a hopper that stores raw materials to a raw material supply port of a heating cylinder by rotation of a feed screw, a cam clutch is installed that transmits rotation only in a certain direction to each feed screw. and a chain wheel is provided on the cam clutch, and a variable speed electric motor capable of rotating the rotation direction forward or reverse;
A double chain wheel is provided on the rotating shaft of the variable speed electric motor, and the chain wheel of each of the cam clutches is wound with a chain to selectively rotate the feed screw by forward or reverse rotation of the variable speed electric motor. ``This is what we have done in the past.''

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a heating cylinder, and 2 is a screw fitted into an inner hole 1a of the heating cylinder so as to be able to reciprocate. 3 is a raw material supply port provided at the rear of the heating cylinder, 4 is a part of a housing that fixes the rear end of the heating cylinder 1, and 5 is a raw material passageway communicating with the raw material supply port 3. 6 is a raw material supply tube, and 7 is a feed screw. 8 is a cam clutch that rotates the feed screw in only one direction, and 9 is a chain wheel provided to transmit rotation to the cam clutch. 10
is a hopper that stores a certain amount of raw material, and is fixed so that the raw material falls into the supply port 11 of the raw material supply tube. 12 is a passage through which the raw material extruded by the feed screw 7 falls into the raw material supply port 3 of the heating cylinder 1. In the present invention, a pair of feed screw devices are provided to selectively supply two types of raw materials. Reference numeral 13 designates a raw material passage for guiding the raw material from each feed screw device to the raw material supply port 3 of the heating cylinder 1.

In Figure 2, 14 is the PS motor and the rotating shaft 15
Chain wheels 16 and 17 are fixed at intervals.
Cam clutches 8a and 8b are fixed to a pair of feed screws and fix chain wheels 9a and 9b, respectively. 18 is the rotating shaft 15 of the PS motor 14
Chain wheel 17 fixed to cam clutch 8a and chain wheel 9 of cam clutch 8a
The chain 19 is wound around the chain wheel 9b and the chain wheel 16.

(Operation) Next, the operation will be explained. In Figure 2
When the shaft 15 of the PS motor 14 rotates clockwise when viewed from the right side of the figure, it is called normal rotation, and when it rotates counterclockwise, it is called reverse rotation. When the shaft 15 of the PS motor is rotated in the forward direction, the chain wheel 9b is also rotated in the same direction, and the cam clutch 8b is operated to rotate the feed screw 7b in the forward direction, thereby supplying the raw material from the hopper 10 to the raw material supply port 3 of the heating cylinder 1. At this time, forward rotation is transmitted to the cam clutch 8a provided on the other feed screw 7a, but the cam clutch idles and the feed screw 7a does not rotate. Feed Skrill 7
Rotating a can be done by rotating the PS motor in the opposite direction.

(Effects) As explained above, instead of supplying the raw material directly from the hopper by dropping it into the heating cylinder, one PS motor is installed in two feed screw devices, and a cam clutch is used for each feed screw to simply rotate the PS motor. A major effect of this invention is that it is possible to switch the supply of raw materials by simply changing the direction, which makes the device more compact and increases the reliability of operation.In addition, it shortens the setup time for changing raw materials in the injection molding machine. be.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention, and FIG. 2 is a plan view. 1... Heating cylinder, 2... Screw, 3... Raw material supply port, 6... Raw material supply cylinder, 7, 7a, 7b... Feed screw, 8, 8a, 8b... Cam clutch, 9, 9a, 9b... Chain wheel, 10...hotupa.

Claims (1)

[Scope of utility model registration request] In a pair of raw material supply devices that supply a predetermined amount of raw material from a hopper for storing raw materials to a raw material supply port of a heating cylinder by rotation of a feed screw, each feed screw is provided with a cam clutch that transmits rotation only in a fixed direction; A chain wheel is provided on the cam clutch, a variable speed electric motor capable of forward or reverse rotation is provided on the one hand, and a double chain wheel is provided on the rotating shaft of the variable speed electric motor, and a chain wheel is provided on each of the cam clutches. 1. A raw material supply device for an injection molding machine, characterized in that the feed screw is selectively rotated by forward or reverse rotation of the variable speed electric motor, which is wound with a chain.