JPS6323863B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and an apparatus for manufacturing irregularly shaped cans by expanding the can bodies of formed empty cans.

Conventionally, as a method and apparatus for manufacturing irregularly shaped cans as shown in FIG. 1, a device as shown in FIG. When the cylinder b is operated and the cylinder rod c is lowered, the shaft d of the split mold tool a connected to the rod c is also lowered, expanding the split mold e radially outward and forming a cylindrical tube. The raw material was also expanded at the same time, and the body part g other than the tube end part f was formed into an irregular shape to produce an irregularly shaped can. However, in this manufacturing device, the pressing part for expanding the split mold tool a is only at one location, approximately in the center of the split mold tool a.
It is difficult to ensure that the amount of expansion on the top and bottom of the can is always uniform, and one of the causes is the occurrence of defective cans. In addition, since the amount of expansion is proportional to the amount of descent of axis d if the inclination of the contact surface between axis d and split die a is constant, an adjustment device is required to keep this constant, which complicates the manufacturing equipment for irregular-shaped cans. Not only that, but the length of the split mold e needs to be the same as the length of the cylindrical tube material, which makes it difficult to remove the split mold e from the irregular can after expanding to produce irregular cans, making it difficult to mass produce irregular cans. was not suitable.

The manufacturing method and apparatus thereof of the present invention solve the above-mentioned drawbacks, and the apparatus for manufacturing irregularly shaped cans of the present invention will be described in detail below.

FIG. 3 shows an apparatus used in the method of manufacturing irregularly shaped cans of the present invention, in which a split mold holding member 3 is fixed to the tip of the split mold operating mechanism 1 via screws 2, etc., and the holding member 3 holds split molds 5, 5' via fixing pins 4. A guard bead groove 6 is formed in the stem of the split molds 5, 5', and the length of the split molds 5, 5' that expands radially is 1/2 of the length of the empty can that has been made into a barrel. be. In addition, an uneven part 7 is provided at the tip of the split mold 5 so that the uneven part 7 provided at the tip of another split mold 5', which is provided symmetrically with respect to the line X-Y, can be fitted freely. The expanded surfaces of the split molds 5 and 5' should always be aligned. An expander pin 8 for radially expanding the split molds 5, 5' is reciprocatably inserted into the center of the split molds 5, 5'. At the rear of the expander pin 8, there is an inclined part 11 for operating an actuation pin 10 that operates a guard bead pressing lever 9 attached to the split die operating mechanism 1, and a split die 5, which connects the split die operating mechanism 1 to the split die 5.
A protrusion 12 is formed which also serves to retract the container 5' to the position before inserting it into the formed empty can. 13 is a spring for returning the split molds 5, 5' to the state before being expanded after being radially expanded, and 14 is a shaft for rotating the guard bead pressing lever 9. Although not shown in the drawings, the reciprocating movement of the expander pin 8 and the rotation mechanism and reciprocating movement of the split die actuating mechanism 1 are performed using a conventionally known driving device such as a cylinder or a motor.
As shown in FIG. 3, the present invention provides the expanding device configured as described above, so that the front end surfaces of the split molds can be joined freely with respect to the line X-Y where the center of the can body is located on the same axis. It is constructed by providing a pair of them so that they can be moved symmetrically. In addition, in carrying out the invention, a large number of manufacturing devices of the present invention are arranged in a rotating mechanism,
They are simultaneously controlled by a cam mechanism, etc.

Next, a method for manufacturing a deformed can according to the present invention will be explained in detail.

Empty cans that have been made into shells and filled with beads in the previous process are
When the empty can is transported by an appropriate method to the irregular-shaped can manufacturing apparatus, the split mold actuating mechanism 1 moves forward from both ends of the empty can, and the split molds 5 and 5' at the tip are inserted from both sides, and the uneven cans are 7 are engaged, and the split molds 5 and 5' become one body. Next, the expander pin 8 moves forward and pushes up the operating pin 10 with the inclined part 11 to operate the guard bead pressing lever 9 to press the guard bead at both ends of the empty can and firmly fix the empty can.
The expander pin 8 moves further forward and presses the split molds 5, 5' outward in parallel with the two inclined parts of the expander pin 8 and the front surface of the projection 12, and as a result, the split molds 5, 5' Empty cans fitted on the outside are also expanded to produce irregularly shaped cans. When an irregularly shaped can is manufactured, the expander pin 8 is moved back and the split molds 5 and 5' are released from the pressure of the expander pin 8, so that the split molds 5 and 5' are returned to their pre-expanded state by the spring 13. At the same time as being returned, the actuating pin 10 is also free to descend, and the guard beat pressing lever 9 is also rotated to be released from the tightening of both ends of the irregularly shaped can. Furthermore, expander pin 8
moves back and the operating pin 10 becomes the expander pin 8.
The split mold actuating mechanism 1 is retracted, and the split molds 5 and 5' are completely released from the irregular can to produce an expanded can with a guard beat inserted therein. By arranging a large number of apparatuses for producing irregularly shaped cans and sequentially repeating the above manufacturing method, irregularly shaped cans with expanded can bodies can be efficiently produced in large quantities. In addition, since the split mold is split into two parts, it is easy to remove after producing an odd-shaped can, and the split molds on both sides engage at their uneven parts and operate as one, so the abutting part of the molds There is no difference in level.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an irregularly shaped can, FIG. 2 is a partial side sectional view of a conventional apparatus for manufacturing irregularly shaped cans, and FIG. 3 is a side sectional view of an apparatus for manufacturing irregularly shaped cans according to the present invention. Middle code: 1: Split mold operating mechanism, 2: Screw, 3: Split mold holding member, 4: Fixed pin, 5: Split mold, 6: Guard beat groove, 7: Uneven part, 8: Expander pin, 9: Guard beat Actuation lever, 10: actuation pin, 11: inclined portion, 12: protrusion, 13: spring, 14: shaft.

Claims (1)

[Scope of Claims] 1. 1/1 of the length of the empty can from both ends of the formed empty can.
A pair of split molds having a length of 2 are inserted symmetrically and joined at the center of the empty can, and an expander pin is advanced into each of the pair of split molds to expand the pair of split molds radially. A method for manufacturing irregularly shaped cans, which comprises manufacturing irregularly shaped can bodies. 2. Fix a split mold holding member to the tip of the split mold operation mechanism, attach a split mold that expands radially to the length of 1/2 the length of the empty can to the split mold holding member, and attach an expander pin to the center. is inserted in a reciprocating manner, and an expanding device configured to operate the split mold by the expander pin is arranged symmetrically on the same axis so that the tip surfaces of the split mold are opposed and joined. An apparatus for manufacturing irregularly shaped cans, characterized by a pair of movable cans.