JP2612448B2 - Device for engraving the peripheral surface of a hollow cone - Google Patents

Description

The present invention relates to a method and apparatus for engraving characters, patterns and the like on the peripheral surface of a hollow cone such as a cap sealing material.

(B) Conventional technology Conventionally, as a method of engraving characters, patterns, etc. on the peripheral surface of a hollow cylindrical body such as an object or a cap sealing material, there is a cylindrical shape in which the characters, patterns, etc. are formed on the peripheral surface. A method of fitting a hollow cylindrical body to a mandrel and pressing the peripheral surface of the hollow cylindrical body using a cylindrical backup roll has been adopted. If the object to be engraved is a hollow cylinder, no particular problem arises with the above method, but if it is a hollow cone, such as a hollow truncated cone, for example, a problem that is difficult to solve arises.

As a method of engraving characters, patterns, etc. on the peripheral surface of the hollow cone, the hollow cone is fitted into a cone-shaped mandrel in which the characters, patterns, etc. are formed on the peripheral surface, and a cone-shaped backup roll is used. A method of pressing the peripheral surface of the hollow cone is considered. However, the peripheral surface of the cone-shaped mandrel is formed in an uneven state by imprinting characters, patterns, and the like, and the pressing force of the cone-shaped backup roll changes at the uneven portion. At this time, the rotation axis of the cone-shaped backup roll is fixed,
The excessive pressing force is mainly distributed in the head direction of the peripheral surface of the hollow cone and tends to act in that direction. Therefore, the hollow cone fitted to the cone-shaped mandrel may be displaced in the head direction, and there is a disadvantage that a predetermined position on the peripheral surface of the hollow cone cannot be stamped.

(C) Problems to be Solved by the Invention Therefore, the present invention is designed so that the pressing force of the backup roll always acts perpendicularly to the peripheral surface of the hollow cone by devising the mounting means of the cone-shaped backup roll, Part of the pressing force is prevented from being dispersed in the head direction, which is the horizontal direction of the peripheral surface of the hollow cone.

(D) Means and Embodiment for Solving the Problems That is, the present invention provides a cone-shaped mandrel, a cone-shaped backup roll that can be in close contact with the cone-shaped mandrel, and a device for transmitting rotation to the cone-shaped backup roll. A rotating shaft, the rotating shaft is divided into three in the longitudinal direction, a first rotating shaft connected to a driving source, and connected to the first rotating shaft so as to be freely bent and the length thereof is variable. A second rotating shaft, and a third rotating shaft that is flexibly connected to the second rotating shaft, the cone-shaped backup roll is mounted on the third rotating shaft, and the third rotating shaft is Pressurizing means for moving the cone-shaped mandrel side is connected to the third rotating shaft, and at least one of the cone-shaped mandrel and the cone-shaped backup roll has a convex or concave character or pattern. The present invention relates to an apparatus for engraving a peripheral surface of a hollow cone, wherein the peripheral surface of the hollow cone is shaped.

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In the drawing, (1) is a frusto-conical mandrel. The mandrel (1) is made of steel, and characters, patterns, and the like are formed on the peripheral surface thereof in a convex shape. The mandrel (1) is fitted on a rotating shaft (2), and the rotating shaft (2) is driven by a motor (3) as a drive source.

The rotating shaft (2) and the first rotating shaft (4) are linked by gears (12) and (13) having the same pitch and rotate at the same speed. The second rotating shaft (5) is connected to the tip of the first rotating shaft (4) by a universal joint, and both rotating shafts (4) and (5) are bendable. The second rotating shaft (5) has a cylindrical portion (6) and a mandrel (7) fitted in the cylindrical portion (6), and the insertion position of the mandrel (7) can be arbitrarily determined. Thereby, the length of the second rotation shaft (5) becomes variable. A third rotating shaft (8) is connected to the other end of the second rotating shaft (5) by a universal joint.
(8) is bendable. This third rotating shaft (8)
Is fitted with a backup roll (9). The backup roll (9) has a frusto-conical shape similar to the mandrel (1), and is designed so that both peripheral surfaces are in close contact with each other and there is no difference between the rotational speed and the peripheral speed. At both ends of the backup roll (9), guides (10) for supporting the third rotating shaft (8) are attached, and the guides (10) are compressed by an air cylinder (11) as a pressurizing means. Go up and down. The rotation axis of the backup roll (9) including the first rotation axis (4), the second rotation axis (5), and the third rotation axis (8) is such that the rotation transmitted from the gear (13) is the first rotation axis. The rotation is transmitted from (4) to the third rotation shaft (8) via the second rotation shaft (5). Therefore, the backup roll (9) rotates at the same speed as the rotation speed of the gear (13).

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

First, the frustoconical mandrel (1) is fitted with a hollow frustoconical object to be engraved. Thereafter, the length of the second rotating shaft (5) is changed so that the backup roll (9) abuts on the peripheral surface of the hollow truncated cone exactly. Then, the peripheral surface of the hollow truncated cone is pressed by operating the air cylinder (11) so that the backup roll (9) comes into close contact with the mandrel (1) at a predetermined pressure. Then, the motor (3) is driven to rotate the mandrel (1) and the backup roll (9) at the same peripheral speed. Then, since a predetermined pressing force is applied to the peripheral surface of the hollow truncated cone, characters, patterns, and the like formed on the mandrel (1) are stamped on the peripheral surface. At the time of this engraving, the backup roll (9) is rotated by the second rotating shaft (5).
By changing the length of the mandrel (1), it is possible to accurately position it at a predetermined position. Since the rotating shaft (8) and the second rotating shaft (5) and the second rotating shaft (5) and the first rotating shaft (4) are bendable, an excessive pressing force in the direction of the third rotating shaft (8). The pressing force of the backup roll (9) does not act in the head direction of the peripheral surface of the hollow truncated cone, but always acts in the direction perpendicular to the peripheral surface of the hollow cone. I have.

Next, a part of another modification example other than the above-described embodiment will be described as follows.

In the above embodiment, the truncated conical mandrel (1) was used, but the shape is not particularly limited, and may be a conical mandrel, a polygonal pyramid mandrel, or the like. Absent.
In addition, although letters and patterns are formed on the frustoconical mandrel (1) in a convex shape, they may be formed in a concave shape, and letters and patterns may be formed on the backup roll (9) in a convex or concave shape. May be typed. Also, it is preferable to attach an elastic sleeve such as a polyurethane sheet to the surface of the backup roll (9). This is because an excessive pressing force by the backup roll (9) can be absorbed. A gear (12) for rotating the rotating shaft (2) of the frustoconical mandrel (1) and a gear (1) for rotating the rotating shaft of the backup roll (9), particularly the first rotating shaft (4).
Although the rotation is performed at the same pitch and the same rotation speed as in 3), the pitch and the rotation speed may be different. Preferably, however, the peripheral speed of the frusto-conical mandrel (1) and the backup roll (9) should be the same. In the embodiment, one drive source is used. However, it is a matter of course that the drive sources for the rotating shaft (2) and the first rotating shaft (4) may be separate. It goes without saying that the various members used in the above embodiments can be replaced by other equivalent members.

(E) Function and Effect of the Invention As described above, the device according to the present invention can freely change the length of the second rotation shaft located at the center of the rotation shaft of the backup roll, so that the cone-shaped The backup roll can be accurately brought into contact with the conical mandrel at a predetermined position. Further, 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 swing slightly. From these facts, the backup roll can apply only a pressing force perpendicular to the peripheral surface of the hollow cone, and therefore can accurately imprint a predetermined position on the peripheral surface of the hollow cone.

[Brief description of the drawings]

The drawing is a schematic diagram of an apparatus according to an embodiment of the present invention.
(1) is a truncated cone mandrel, (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 frusto-conical backup roll,
(11) is an air cylinder.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 58-18765 (JP, U) Japanese Utility Model Showa 39-16812 (JP, Y1)

Claims (1)

(57) [Claims] A cone-shaped mandrel, a cone-shaped backup roll that can be in close contact with the cone-shaped mandrel, and a rotation axis for transmitting rotation to the cone-shaped backup roll, wherein the rotation axis extends in a longitudinal direction. A first rotary shaft that is divided into three and connected to a drive source, a second rotary shaft that is flexibly connected to the first rotary shaft and has a variable length,
A third rotating shaft flexibly connected to the second rotating shaft, wherein the cone-shaped backup roll is mounted on the third rotating shaft, and moves the third rotating shaft toward the cone-shaped mandrel. A pressurizing means coupled to the third rotating shaft, and at least one of the cone-shaped mandrel and the cone-shaped backup roll, a convex or concave character or pattern or the like is formed. A device for engraving a peripheral surface of a hollow cone.