JPH08158Y2 - Cutting machine for plastic strips - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to an improvement of a take-off cutting machine which cuts a plastic strip or the like extruded in a molten state from an extruder and taken at a constant speed into a predetermined length. The plastic strips and the like mentioned here are thin pipes and flat strips of polyolefin or polyvinyl chloride, and are woven materials such as straws, flower buds, and droops.

2. Description of the Related Art A conventional structure of a take-off cutting machine is as shown in FIG.
The structure was such that a plastic strip (11) or the like taken up by the take-up roll (10) was cut by a cutter (13) attached to a disk (12) rotating in synchronization with the take-up roll. In the case of such a conventional structure, the disc (12) makes one revolution and the cutter (13) is cut once, and since it is synchronized with the take-up roll, the take-up speed of the plastic strip is increased. However, even if we tried to improve the cutting surface and increase the moving speed of the cutter, there was a limit to the rotation speed, so after that there was no other way but to enlarge the disk (12), and there was a limit to it.

[Problems to be solved by the device]

In the present invention, the cutting by the cutter is synchronized with the take-up roll in order to obtain a predetermined length, but the cutting speed of the cutter is increased to make the escape faster, the cutting resistance against the take-up speed is reduced, and the plastic is cut. It aims to make the speed of picking up articles constant.

[Means for Solving the Problems]

As a result of studying the above-mentioned problems, a planetary gear (3) that meshes with and rotates around the fixed gear (5) is provided at the tip of a rotating arm (2) that rotates about the center of the fixed gear (5). We have developed a take-off cutting machine for plastic strips, etc., in which a single blade rotary cutter (4) is provided on the shaft (7) of 3). For the rotary cutter, for example,
It is easy to think of using circular saws like those found in No. 48-7898, but cutting of plastic strips, that is, plastic thin tubes and flat strips, is a repetitive escape of plastic strips due to the uneven edges of circular saws. Or, even if it can be cut, the cut surface is not good and the commercial value is reduced. In addition, it becomes difficult to increase the cutting speed as the product take-up speed increases. So a single blade cutter must be used to cut the plastic strip.

[Action]

With such a structure, the planetary gear (3) rotates a plurality of times for one rotation of the rotating arm (2) depending on the gear ratio of the planetary gear (3) to the fixed gear (5),
The cutter also rotates to increase the cutting speed. If the gear ratio between the fixed gear (5) and the planetary gear (3) is increased, the peripheral speed of the cutter (4) is greatly increased and the cutting speed can be increased, and the take-up speed of the plastic strip or the like can be increased. Even if the cutting length is large and the cutting length is short, a sharp cutting effect can be obtained.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a plastic strip take-off / cutting machine according to an embodiment of the present invention, and FIG. 2 is an enlarged front view of the relevant part. This device is provided with a rotating arm (2) around the center of a large-diameter fixed gear (5) fixed to the device body (1). In this example, a balance block (6) is provided at one end of the rotating arm (2). At the tip of the other end of the rotating arm (2), a planetary gear (3) that meshes with the fixed gear (5) and revolves is provided. This planet gear (3) has a much smaller diameter than the fixed gear (5) and has a gear ratio of 1: 5. A disk is provided coaxially with the planetary gear (3), and a single blade rotary cutter (4) is provided so as to project therefrom. Therefore, the rotary cutter (4) makes five revolutions while the rotary arm (2) makes one revolution. If the rotating arm (2) is to be cut twice during one rotation, the balance block (6) is replaced with another unit of the rotating cutter (4). Should be provided. When it is desired to increase the cutting speed of the rotary cutter (4), that is, the rotation speed, the diameter of the planetary gear (3) may be reduced.

[Effect of device]

With the above-described structure of the take-off cutting machine for plastic strips and the like according to the present invention, the cut surface of the cut plastic strip or the like becomes good and the cut surface becomes a right angle. Furthermore, the effect of improving the accuracy of the cutting length was obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a plastic strip take-off / cutting machine according to an embodiment of the present invention, and FIG. 2 is an enlarged front view of the relevant part. FIG. 3 is a perspective view of a conventional plastic strip take-off cutting machine. (1) …… Main unit, (2) …… Rotating arm (3) …… Planet gear, (4) …… Rotating cutter (5) …… Fixed gear, (7) …… Planet gear shaft

Claims (1)

[Scope of utility model registration request] 1. A planetary gear (3), which meshes with the fixed gear (5) and revolves, is provided at the tip of a rotating arm (2) which rotates about the center of the fixed gear (5), and the planetary gear (3).
A take-off cutting machine for plastic strips or the like, characterized in that a rotary cutter (4) having a single blade is provided on a shaft (7) of the.