JP2554857Y2 - Electric protruding device of 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 an electric projecting device of a molding machine such as an injection molding machine used for molding a synthetic resin.

[0002]

2. Description of the Related Art A conventional electric protruding device is disclosed in Japanese Unexamined Patent Publication No.
As described in No. 2811, each member constituting the projecting device is assembled to a movable plate of a molding machine. For this reason, the protruding device cannot be handled alone, and it is troublesome to exchange members. Moreover, since the protruding device and the motor are separate bodies, after assembling the protruding device on the movable platen, a belt must be applied between the pulley on the motor side and the pulley on the protruding device side installed in other parts of the movable platen. Therefore, assembling and removal also require trouble.

[0003]

As means for solving such a conventional problem, a projecting device and a motor are unitized on the same axis, the motor is housed in a movable plate, and the projecting device is mounted on a movable plate. An eject system which is mounted on the mold side is described in JP-A-4-129717. However, in this case, since the protruding device protrudes from the mold side of the movable platen, an extra space is required between the fixed platen for mounting the mold and the movable platen. There is a new problem that the apparatus is configured to be long and is larger than a normal molding machine.

Further, since a deep recess is formed in the center of the movable plate to accommodate the motor portion, there is a problem in the strength of the movable plate, and the movable plate is easily bent during strong mold clamping, so that the thickness is increased. For example, it is necessary to increase the strength of the movable platen by providing or reinforcing the movable platen.

The present invention has been conceived in order to solve the above-mentioned conventional problems. The purpose of the invention is to make the projecting device a unit so that it can be handled independently, and the mounting to the movable plate may be performed on the rear side. Another object of the present invention is to provide a new type of electric protruding device which does not require any trouble for mounting.

[0006]

The feature of the present invention for the above object is that a ball nut member at a fixed position rotatably provided in the center of the inside of a case body, a driven pulley attached to an end of the ball nut member, , A ball screw shaft connected to the ball nut member with a protruding rod connected to the tip so as to freely advance and retreat, a rotation preventing member for guiding the ball screw shaft in the axial direction, and a case fixed to the case opening on the protruding rod side The servo motor comprises a projecting device consisting of a lid and a servomotor, and the servomotor is juxtaposed to the side of the projecting device. A motor and a unit are provided, and the projecting device is configured to be connectable to a movable plate of a molding machine via the case lid.

[0007]

[Operation] In the above configuration, after projecting from the back of the movable plate, abutting the case cover on the rod side, projecting the rod into the center of the movable plate, and inserting the rod into the center of the movable plate, the protruding device is inserted by the connecting bolt at the required location inserted from the mold mounting side. Can be fixed to the back of the movable platen. The driving force of the servomotor is transmitted to the driven pulley via the timing belt, and the ball nut member rotates at a fixed position together with the driven pulley, and the ball screw shaft moves forward and backward together with the protruding rod to form the molded product. Perform the projecting operation.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings, taking a projecting device of a direct pressure type injection molding machine as an example.

In the drawing, reference numeral 1 denotes a protruding device. A cylindrical ball nut member 3 is supported by a ball bearing 4 at the center of the inside of a cylindrical case body 2 and is rotatably provided at a fixed position in a longitudinal direction. is there.

An annular driven pulley 5 is integrally attached to the tip of the ball nut member 3, and a ball screw shaft 6 is threadably engaged with the inside thereof. A projecting rod 7 of a required length is connected to the tip of the ball screw shaft 6, and a guide plate 8 is attached at a right angle to the rear end using a nut 9.

The guide plate 8 is located in a notch groove 10 formed on both sides of the rear portion of the case body 2, and a guide rod 11 attached to the case body 2 in parallel with the ball screw shaft 6 projects into the notch groove 10. Then, the guide plate 11 is attached to the guide rod 11.
To prevent rotation of the ball screw shaft 6 and guide the ball screw shaft 6 in the axial direction.

Reference numeral 12 denotes a case lid fixed to the case opening on the projecting rod side, 13 denotes a case lid fixed to the case opening on the cutout groove side, and the projecting device 1 includes the case lids 12, 1
The joint 3 is connected to both the ball screw shaft 18 for mold clamping rotatably supported by the movable plate 16 and the fixed plate 17 by connecting bolts 14 and 15.

Reference numeral 19 denotes a servomotor provided with a drive pulley 20 at the shaft end of a drive shaft, and a pedestal 21 provided on the side of the case body 2 in parallel with the driven pulley 5.
And juxtaposed on the side of the protruding device 1. Further, a timing belt 22 is connected from the driving pulley 20 to the driven pulley 5.
Is installed through a side opening (not shown) of the case lid 12, thereby forming a unit in which the projecting device 1 and the servomotor 19 are integrated.

In the projecting device 1, the projecting rod 7 is inserted into the through hole 23 at the center of the back of the movable platen 16, the case lid 12 is brought into contact with the movable platen 16, and then inserted from the mold mounting side. The movable platen 1 is fixed by the connecting bolts 14 at required locations.
6, the case cover 13 at the rear is attached to the tip of the ball screw shaft 18 for mold clamping with the connecting bolt 15, and then the case cover 13 is bolted to the case body 2. Therefore, the mold can be connected to the ball screw shaft 18, and the mold clamping force acts on the movable platen 16 via the case body 2.

The driving force of the servo motor 19 is transmitted to the driven pulley 5 via the timing belt 22, and the ball nut member 3 rotates at a fixed position together with the driven pulley 5 to move the ball screw shaft 6 to the projecting rod 7. At the same time, it moves forward and backward to perform the projecting operation of the molded product.

When the molding machine is of a toggle type, a ball screw shaft for mold clamping is not required, so that the mounting of the projecting device is performed only on the movable platen side.

[0017]

According to the present invention, as described above, a servo motor is juxtaposed on the side of the protruding device, and a timing belt is provided between the driving pulley on the motor side and the driven pulley. And the projecting device can be connected to the movable plate of the molding machine via the case lid at the end of the case body, so that the entire device including the servomotor can be handled as a single device, Since the apparatus can be assembled and disassembled away from the movable platen, maintenance and management of the protruding apparatus can be performed well, and replacement of members can be simplified as compared with the related art.

Even if the servomotor is integrated, it can be mounted on the back of the movable plate, so the space for mounting the mold between the fixed plate and the movable plate may be the same as before, and a deep recess for burying the motor is provided. Since there is no need to form the movable plate on the movable plate, there is no problem in the strength of the movable plate, and there is an advantage that it can be adopted in any of the direct-clamp type and toggle type mold clamping systems.

Furthermore, since a servo motor can be provided close to the side of the case body by providing a pedestal, the distance between the axis of the drive shaft of the servo motor and the axis of the projecting rod can be set to a minimum. This has the advantage that the bending stress applied to the shaft core and the pedestal can be minimized and the drive can be maintained smoothly and long.

[Brief description of the drawings]

FIG. 1 is a half plan sectional view showing a state in which an electric protruding device of a molding machine according to the present invention is attached to a direct pressure type mold clamping device of the molding machine.

FIG. 2 is a front view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Projecting device 2 Case main body 3 Ball nut member 5 Follower pulley 6 Ball screw shaft 7 Projecting rod 8 Guide plate 10 Notch groove 11 Guide rod 12 Case lid 14 Connecting bolt 16 Movable plate 19 Servo motor 20 Drive pulley 21 Base 22 Timing belt

Claims (1)

(57) [Scope of request for utility model registration] 1. A ball nut member at a fixed position rotatably provided in the center of the inside of a case body, a driven pulley attached to an end of the ball nut member, and a protruding rod connected to the tip to form a ball nut member. A protruding device consisting of a ball screw shaft screwed forward and backward, an anti-rotation member for guiding the ball screw shaft in the axial direction, a case lid fixed to the case opening on the protruding rod side, and a servo motor. , The servo motors are arranged side by side on the protruding device,
A timing belt is stretched over the drive pulley on the motor side and the driven pulley to unitize the projecting device and the servomotor, and the projecting device can be connected to the movable plate of the molding machine via the case lid. An electric projection device for a molding machine.