JPS63299969A - Method and apparatus for die-stamping on peripheral surface of hollow conical body - Google Patents

Abstract

PURPOSE:To enable accurate die-stamping at a predetermined position on the peripheral surface of a hollow conical body, by exerting only a pressure to a direction perpendicular to the peripheral surface of the hollow conical body. CONSTITUTION:A hollow truncated conical body to be die-stamped is fitted over a truncated conical mandrel 1. Thereafter, the length of a second rotary shaft 5 is varied to bring a back-up roll 9 into accurate contact with the peripheral surface of the hollow truncated conical body. Then, an air cylinder 11 is operated to bring the back-up roll 9 into close contact with the mandrel 1 with a predetermined pressure, thereby pressing the peripheral surface of the hollow truncated conical body. Subsequently, a motor 3 is driven to rotate the mandrel 1 and the back-up roll 9 at the same circumferential velocity. Since the predetermined pressure is exerted on the peripheral surface of the hollow truncated conical body, characters, patterns or the like formed on the mandrel 1 are die-stamped on the peripheral surface of the hollow truncated conical body.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method and apparatus for imprinting characters, patterns, etc. on the circumferential surface of a hollow cone such as a cap sealing material.

(B) Conventional technology Conventionally, there are methods for stamping characters, patterns, etc. on the circumferential surface of hollow cylindrical bodies such as vessels and cap sealing materials.
A method has been adopted in which a hollow cylinder is fitted onto a cylindrical mandrel having a pattern or the like formed on its circumferential surface, and a cylindrical backup roll is used to press the circumferential surface of the hollow cylinder.

When the object to be marked is a hollow cylinder, no particular problem arises with the above method; however, when the object to be marked is a hollow cone such as a hollow truncated cone, a problem that is difficult to solve arises.

In order to engrave letters, patterns, etc. on the circumferential surface of a hollow cone, the hollow cone is fitted onto a cone-shaped mandrel on which letters, patterns, etc. are imprinted on the circumferential surface, and a cone-shaped backup roll is used. One possible method is to press the circumferential surface of a hollow cone. However, the circumferential surface of the cone-shaped mandrel is shaped with letters, patterns, etc., resulting in an uneven state, and the pressing force by the cone-shaped backup roll changes depending on the uneven portion. At this time, since the rotation axis of the cone-shaped backup roll is fixed, the excessive pressing force is mainly distributed toward the head of the circumferential surface of the hollow cone.
It tends to act in that direction. Therefore, there is a risk that the hollow cone fitted to the cone-shaped mandrel may shift in the direction of its head, and there is a drawback that it is not possible to engrave at a predetermined position on the circumferential surface of the hollow cone.

(c) Problems to be Solved by the Invention Therefore, the present invention devises a means for attaching the cone-shaped backup roll so that the pressing force of the backup roll always acts perpendicular to the circumferential surface of the hollow cone. This prevents part of the pressing force from being dispersed in the horizontal direction of the circumferential surface of the hollow cone, such as in the direction of the head.

(d) Means and embodiments for solving the problems, that is, the present invention is characterized in that a hollow cone is fitted onto a cone-shaped mandrel, and only a pressing force perpendicular to the circumference of the hollow cone is applied. It relates to a method of marking on the circumferential surface of a hollow cone,
A device for implementing this method includes a cone-shaped mandrel, a cone-shaped backup roll that can be brought into close contact with the cone-shaped mandrel, and a rotating shaft for transmitting rotation to the cone-shaped backup roll; The rotating shaft is divided into three parts in the longitudinal direction, and includes a first rotating shaft connected to a drive source, a second rotating shaft that is bendably connected to the first rotating shaft and whose length is variable, and the third rotating shaft. The present invention relates to a device for marking the circumferential surface of a hollow cone, characterized by comprising a third rotary shaft that is bendably connected to two rotary shafts and is equipped with a pressure means for raising and lowering the cone.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In the drawing, (1) is a truncated conical mandrel.

This mandrel (1) is made of steel, and has letters, patterns, etc. formed in a convex shape on its circumferential surface. Mandrel (
1) is fitted onto the rotating shaft (2), and this rotating shaft (2)
) is driven by a motor (3) as a driving source.

The rotating shaft (2) and the first rotating shaft (4) are connected by gears (b) and gears having the same pitch, and rotate at the same speed.

A second rotating shaft (5) is connected to the tip of the first rotating shaft (4) by a universal joint, and both rotating shafts (41, (5) are bendable.This second rotating shaft (5) is the cylindrical part (6)
and a mandrel (7) fitted into this cylindrical part (6), and by arbitrarily determining the insertion position of the mandrel (7), the length of the second rotating shaft (5) can be varied. becomes. A third rotating shaft (8) is connected to the other end of the second rotating shaft (5) by a universal joint, and both rotating shafts (5) and +81 are bendable. A backup roll (9) is fitted to this third rotating shaft (8). The backup roll (9) has a truncated conical shape similar to the mandrel (1), and is designed to ensure that both surfaces are in close contact with each other and that there is no difference in rotational speed and circumferential speed. A guide α0 that pivotally supports the third rotating shaft (8) is attached to both ends of the backup roll (9), and this guide OI) is raised and lowered by air pressure from an air cylinder α0 serving as a pressurizing means. The rotation shaft of the backup roll (9) consisting of the first rotation shaft (4), the second rotation shaft (5), and the third rotation shaft (8) is such that the rotation transmitted from the gear +13 is connected to the first rotation shaft (
4) to the third rotating shaft (8) via the second rotating shaft (5).
It is transmitted to and rotates. Therefore, the backup role (
9) rotates at the same speed as the rotational speed of gear α.

When stamping the peripheral surface of a hollow cone using this device, the following method is used.

First, a hollow truncated cone to be stamped is fitted onto the truncated conical mandrel (1). After this, the second rotation axis (
5) Change the length so that the backup roll (9) accurately abuts the circumferential surface of the hollow truncated cone. Then, the air cylinder OD is operated to press the circumferential surface of the hollow truncated cone so that the backup roll (9) comes into close contact with the mandrel (11) with a predetermined pressure.After this, the motor (3) is driven. Then, the mandrel (11) and the backup roll (9) are rotated at the same circumferential speed. Then, since a predetermined pressing force is applied to the circumferential surface of the hollow truncated cone, the mandrel (11) and the backup roll (9) are shaped into a mandrel (+1). Characters, patterns, etc. are engraved on the circumferential surface.During this engraving,
The backup roll (9) is accurately positioned at a predetermined position by changing the length of the second rotating shaft (5), and the peripheral surface of the hollow truncated cone is Even if an excessive pressing force is applied to Three rotation axes (
8) Because the excessive pressing force is dispersed in the direction, the pressing force by the backup roll (9) does not act in the head direction of the circumferential surface of the hollow truncated cone, and the circumferential surface of the hollow cone is always It acts perpendicular to the plane.

Next, some modifications other than the above-mentioned embodiment will be described below.

In the above embodiment, the frusto-conical mandrel (1)
However, the shape is not particularly limited, and may be a cone-shaped mandrel, a polygonal pyramid-shaped mandrel, etc. In short, any cone-shaped mandrel is acceptable. In addition, although letters, patterns, etc. are formed in a convex shape on the truncated cone-shaped mandrel (1), they may be formed in a concave shape, and furthermore, letters, patterns, etc. are formed in a convex or concave shape on the backup roll (9). It may be molded. Further, it is preferable to attach an elastic sleeve such as a polyurethane sheet to the surface of the backup roll (9). This is because the excessive pressing force caused by the backup roll (9) can be absorbed. The gear hammer for rotating the rotating shaft (2) of the frusto-conical mandrel (1) and the gear a-shu for rotating the rotating shaft of the backup roll (9), especially the first rotating shaft (4), are the same. Although the pitch and rotation speed are set to be the same, the pitch and rotation speed may be different. However, if possible, the truncated conical mandrel (1) and the backup roll (9
) is preferably the same circumferential speed. In addition, although the driving source was one in the embodiment, the rotating shaft (two
) and the first rotating shaft (4) may be driven by separate sources.

It goes without saying that the various members used in the above embodiments can be replaced with other equivalent members.

(E) Function and effect of the invention As described above, in the method of the present invention, only the pressing force perpendicular to the circumferential surface of the hollow cone to be engraved is applied, so that the rotating hollow cone is It does not move in any direction. Therefore, it is possible to accurately mark a predetermined position on the circumferential surface of the hollow cone.

In addition, the device according to the present invention can freely change the length of the second rotating shaft located at the center of the rotating shaft of the backup roll, so that the conical backup roll can be accurately positioned on the conical mandrel at a predetermined position. It can be brought into close contact with the Furthermore, since the third rotating shaft and the second rotating shaft and the second rotating shaft and the first rotating shaft are bendable, the backup roll can be slightly oscillated. For these reasons, the backup roll can apply only a pressing force perpendicular to the circumferential surface of the hollow cone, and therefore it is possible to accurately mark a predetermined position on the circumferential surface of the hollow cone.

[Brief explanation of the drawing]

The drawing is a schematic diagram of an apparatus according to an embodiment of the invention. (
1) is a truncated conical mandrel, and (3) is a motor. (4) is a first rotating shaft, (5) is a second rotating shaft, (8) is a third rotating shaft, (9) is a truncated conical backup roll,
αD is an air cylinder.

Claims (2)

[Claims] (1) A method for marking the circumferential surface of a hollow cone, which is characterized by fitting a hollow cone into a conical mandrel and applying only a pressing force perpendicular to the circumferential surface of the hollow cone. (2) A cone-shaped mandrel, a cone-shaped backup roll that can be brought into close contact with the cone-shaped mandrel, and a rotation shaft for transmitting rotation to the cone-shaped backup roll, and the rotation shaft is divided into three parts in the longitudinal direction. a first rotating shaft connected to a drive source; a second rotating shaft bendably connected to the first rotating shaft and having a variable length; and a second rotating shaft bendably connected to the second rotating shaft. A device for marking the circumferential surface of a hollow cone, characterized in that it comprises a third rotating shaft equipped with pressure means for raising and lowering the hollow cone.