JPH0564115B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a platen roll used in an impact printer.

In this specification, the term "aluminum" is used to include all aluminum alloys in addition to pure aluminum.

Conventional technology and its problems Conventionally, a platen roll has been used in which the inner circumferential surface of the cylindrical part of the roll body, which consists of a cylindrical part and a rotating shaft part integrally provided at both ends of the roll body, is lined with a rubber layer. was. The roll body was formed by subjecting a metal tube to a bulging process except for both ends thereof. However, this platen roll has problems in that it is troublesome to manufacture and is heavy in weight. Therefore,
A cylindrical part, a core rod part arranged on the axis of the cylindrical part, and a plurality of connecting walls connecting the cylindrical part and the core rod part are made of an integrally molded aluminum extruded material, and both ends of the core rod part A platen roll has been proposed in which the cylindrical portion and the connecting wall protrude from both ends thereof, and this portion serves as the rotating shaft (see Japanese Utility Model Publication No. 7415/1983). Although this platen roll is manufactured by extrusion processing and is easy to work with, it still has the problem of increased weight.

An object of the present invention is to provide a platen roll that solves the above problems.

Means for Solving the Problems The platen roll according to the present invention consists of a roll main body made of an aluminum tube, a cylinder and a core rod integrally provided on the axis of the cylinder via a connecting wall, and a roll main body. It consists of a roll subbody joined to both ends so that the axis of the cylinder coincides with the axis of the roll main body.

In the above, the core rod includes both solid rods and hollow cylindrical rods.
Moreover, it is preferable to use a seamless pipe as the main body of the roll, but it is not limited to this. Also,
It is preferable that the roll main body and the roll sub-body be joined by a friction welding method, a flat butt welding method, etc., but the method is not limited thereto.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The same parts and parts are denoted by the same reference numerals throughout the drawings, and their explanation will be omitted.

Example 1 This example is shown in FIGS. 1 and 2.

In FIGS. 1 and 2, the platen roll 1 includes a roll main body 2 made of a seamless aluminum pipe, a cylinder 4, and a hollow cylinder integrally provided on the axis of the cylinder 4 via a plurality of radial connecting walls 5. It consists of a tubular core rod 6, and cylinders 4 are provided at both ends of the roll main body 2.
The outer diameter and wall thickness of the cylinder 4 of the roll sub-body 3 are the outer diameter and wall thickness of the roll main body 2, respectively. is becoming equal to These dimensions do not necessarily have to match exactly and may differ slightly. Further, the hollow tubular core rod 6 of both roll sub bodies 3 is made to protrude outward by a predetermined length from the cylinder 4 and the connecting wall 5, and is processed into a shape corresponding to the bearing part of the printer to which the platen roll 1 is attached. The rotating shaft portion 7 is formed by the rotating shaft portion 7. The outer peripheral surface of the platen roll 1 is
It is covered with a rubber layer 8 made of SBR, NBR, etc., and is used as a printer platen.

Such a platen roll 1 is manufactured, for example, as follows.

First, the roll main body 2 is formed by cutting a seamless aluminum pipe into a predetermined length. Also, by extrusion molding from an aluminum billet, a cylinder 4 having an outer diameter and a wall thickness equal to the outer diameter and wall thickness of the roll main body 2 is integrally provided on the axis of the cylinder 4 via a plurality of radial connecting walls 5. Hollow tubular core rod 6
An extruded molded material is made and cut into a predetermined length to form two roll sub-body materials 3A.
The length of this material 3A is equal to the entire length of the core rod 6 in the completed roll subbody 3, that is, the length of the portion existing in the cylinder 4 plus the rotating shaft portion 7. Then, roll main body 2 of this material 3A
are joined to both ends of the cylinder 4 by friction welding so that the axis of the cylinder 4 coincides with the axis of the roll main body 2 (the third
(see figure). Then, by lathe processing, the cylinder 4 and connecting wall 5 of the material 3A are cut and removed as shown by chain lines in FIG. . In this way, the platen roll 1 is produced.

Example 2 This embodiment is shown in FIG.

The platen roll 11 shown in FIG. 4 has the same structure as that of Example 1 except that the core rod 12 of the roll subbody 3 is solid, and is manufactured in the same manner as that of Example 1.

Example 3 This embodiment is shown in FIG.

In the platen roll 21 shown in FIG. 5, the hollow tubular core rod 6 of the roll subbody 3 does not protrude outward beyond the tube 4 and the connecting wall 5, and the rotating shaft 22 is press-fitted into the core rod 6. The configuration is the same as that of the first embodiment except that the second embodiment has the same configuration as that of the first embodiment. In this case, in order to match the axis of the rotating shaft 22 and the axis of the roll subbody 3, the length of the roll subbody 3 must be at least 20 to 30 mm.
It is preferable to set it as approximately. Then, the roll subbody 3 is joined to both ends of the roll main body 2 by friction welding, and the burrs at the joint are cut and removed using a lathe.
Furthermore, it is made by press-fitting the rotating shaft 22.

Effects of the Invention The platen roll according to the present invention consists of a roll main body made of an aluminum tube, a cylinder and a core rod that is integrally provided on the axis of the cylinder via a connecting wall, and at both ends of the roll main body. Since it is made up of a roll sub-body joined so that its axis coincides with the axis of the roll main body, it is possible to achieve a reduction in weight compared to the conventional two platen rolls.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view with the intermediate part omitted showing Example 1 of the present invention, FIG. 2 is a side view of the same, and FIG.
FIG. 4 is a partial longitudinal sectional view showing a second embodiment of the invention, and FIG. 5 is a partial longitudinal sectional view showing a third embodiment of the invention. 1, 11, 21...platen roll, 2...roll main body, 3...roll subsidiary body, 4...tube, 5...
Connecting wall, 6, 12...core rod.

Claims (1)

[Claims] 1 Consisting of a roll main body made of an aluminum tube, a cylinder and a core rod integrally provided on the axis of the cylinder via a connecting wall, and at both ends of the roll main body, the axis of the cylinder coincides with the axis of the roll main body. A platen roll consisting of a roll subbody and a roll subbody joined together in a similar manner.