JP5031407B2 - Web cutting device - Google Patents

Description

  The present invention relates to a web cutting device, and more specifically, a winding device cutting device that uses a multi-axis turret type winder to cut a web continuously fed from a previous process at a predetermined length and winds it around a core. It is about.

  A 20m roll product such as a household wrap film is usually produced at a rate of 15 to 20 pieces per minute using a winder. Conventionally, this type of product is produced on a drum with a diameter of 318.3 mm. A web is affixed, the core is pressed against the drum and wound up, and cutting is performed by protruding a cutting blade from the inside of the drum. For this reason, a groove is provided at one location of the drum, and the cutting blade protrudes from this groove to multiply the drum's diameter 318.3mm by the circumference, so that it can be cut at every 1m, setting the winding length. Is possible every 1 m. However, for each cutting, for example, 20m, 25m, etc. are possible depending on the length of the winding core, but there is a slight difference in the elongation of the film, and there is an error of about 200mm to 400mm even in 20m winding. Has occurred.

However, recently, it has been required to achieve the production of 30 pieces per minute. For this reason, the cutting blade is brought close to the web by the center winding method without using a conventional drum in a multi-axis turret type winding machine. A method of cutting from the position is required. (For example, see Patent Document 1)
JP-A-6-40619

  However, the conventional multi-shaft turret winder cutting device is rotated by a fluid pressure cylinder or the like to perform cutting, but an error of 100 to 300 mm usually occurs in 20m and 30m roll products. there were.

  The present invention addresses such a situation, and in particular, by finding a cutting device that accurately cuts the cutting blade by projecting in a timely manner, the object of the present invention is to reduce the winding length error and to perform accurate cutting at every fixed length. It is what.

That is, the feature of the present invention that meets the above-described purpose is that a multi-axis turret type winder that cuts a web continuously fed from the previous process at a predetermined length and winds it on a winding core, A cutting device is arranged above the intermediate position between the transition position and the winding position, and the cutting device is fixed to the frame, and an elevating plate that is elastically provided via a coil spring at the lower portion of the frame, and the lower portion of the elevating plate In addition to a cutting blade attached to the lift plate, a shaft that protrudes rearward is provided on the lifting plate so that the roller can be attached to the outer periphery of the cam, which is rotated by precise control rotation of the motor. As a result, the elevating plate is moved up and down by contact and separation of the rotating cam and the roller, and the cutting blade is moved up and down, and cutting at a fixed length is possible at a lowering timing controlled by precise control rotation of the motor. It is in.

  According to the cutting device of the present invention, when the roller circumscribing the cam by the rotation of the cam is in the raised state, the lifting plate is in the raised state, and when the roller is detached from the cam by the rotation of the cam, the roller is lowered, The lift plate is in the drop position, and the lower cutting blade cuts the web. Therefore, by rotating the cam using the rotation control of the motor, the elevating plate is surely moved up and down at a predetermined timing, and the cutting blade is moved up and down controlled at a fixed timing accordingly. It is possible to cut with less error for every certain length.

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

  FIG. 1 shows a multi-axis turret type winder equipped with a cutting device according to the present invention. In the figure, T is a turret device at the center, and a web W continuously fed from a web roll R is guided to guide rolls 1 and 2. The paper tube fed to the turret device T, supplied at the paper tube supply position a, and moved to the winding position b by the rotation of the turret device T is used as the winding core 4, and the touch roller 3 is pressed against this. The web is wound up, and after full winding, the full-winding product M is moved by the rotation of the turret device T, and the new winding core is moved to the winding position to prepare for the next winding, while the full-winding product M is released. A cutting device 5 is provided for cutting at a predetermined length between the transition position after full winding and the winding position, and the cutting blade is lowered and cut. Done.

  2 to 4 are a side view, a front view, and a plan view of the cutting device that is a feature of the present invention in the above-described device, and it can be moved up and down in accordance with the guide groove of the guide plate 53 via the coil spring 52 to the fixed frame 51. A plate 54 is engaged, and a cutting blade 55 is attached to the lower part of the lifting plate 54 so that it can be lifted and lowered along with the lifting and lowering of the lifting plate 54, while a shaft 56 projects from the back side of the plate 54. The roller 57 is rotatably mounted on the shaft. This roller 57 rotates on the outer peripheral surface of a turnable curved ball-shaped cam 58 attached to the shaft end of an elevating motor MO having precise rotation control such as an AC servo motor disposed below. According to the shape of the cam 58, the lift plate 54 is lowered and the cutting blade is lowered to cut the web according to the shape of the cam 58. It has become. In order to alleviate the impact when the guide plate 53 is lowered, a cushion rubber 60 is attached to the lower fixed frame 59 that contacts when the guide plate 53 is lowered.

  Thus, as shown in FIGS. 5 (a) to 5 (d), the cam 58 is rotated by the operation of the lifting motor MO with precise rotation control, and when the roller 57 comes into contact with the outer periphery, the lifting plate is sequentially raised. When the cutting blade 55 is moved to the ascending position and the roller 57 moves away from the cam 58, the elevating plate 54 is lowered, thereby lowering the cutting blade and cutting the web.

  By repeating the contact and separation of the roller 57 and the cam 58, as shown in FIGS. 5C and 5D, the elevating plate is raised and lowered and the cutting blade is raised and lowered repeatedly, and the timing of cutting is controlled. At this time, by placing an AC servo motor having precise rotation control on the lifting motor MO, the cam 58 and the roller 57 are more accurately contacted and separated, and the web is kept at a certain length by keeping the lowering timing of the cutting blade 55 constant. It is possible to cut with little error.

When the above-mentioned cutting device is installed in an actual multi-axis turret type winder, a wrap film having a width of 300 mm is continuously fed at a constant speed of 600 m / min, and 10 products each having a winding length of 20 m are produced. The measurement length error of the book was confirmed as follows.
(1) + 100mm
(2) + 100mm
(3) + 105mm
(4) + 110mm
(5) + 110mm
(6) + 110mm
(7) + 90mm
(8) + 110mm
(9) + 110mm
(10) + 110mm
The average error of each book was 105.5 mm, the maximum value was +110 mm, the minimum value was +90 mm, and the difference between them was within 20 mm.

Therefore, when calculating the accuracy of length from the above results,
Film speed: 600 m / min → 10 m / S → 10,000 mm / S, that is, 10,000 mm per second.

  On the other hand, since the actual error is 20 mm from the above result, 20 mm travel time = 20 / 10,000 seconds = 0.002 seconds. Therefore, the descent timing error of the cutting blade was within 0.002 seconds, and it was found that the error was very small and accurate. .

It is a schematic diagram of the multi-axis turret winder provided with the cutting device of the present invention. It is a side surface schematic diagram of a cutting device. It is a front schematic diagram of the cutting device. It is a plane schematic diagram of the raising / lowering plate and cutting blade of the cutting device. (A) is when the blade is raised, (b) is when the blade is dropped, (c) is when the blade starts to rise, and (d) is the blade further raised. Indicates the position.

Explanation of symbols

T: Turret device W: Web MO: Lifting motor 5: Cutting device 51: Fixed frame 52: Coil spring 53: Guide frame 54: Lifting plate 55: Cutting blade 56: Roller shaft 57: Roller 58: Cam 59: Lower fixed frame 60: cushion rubber

Claims (1)

In the multi-axis turret type winder that cuts the web continuously fed from the previous process at fixed lengths and winds it around the winding core, above the intermediate position between the winding position and the position after full winding The cutting device is configured to include a fixed frame, an elevating plate that is elastically provided under the frame via a coil spring, and a cutting blade attached to the lower portion of the elevating plate. A plate that protrudes rearward is provided on the plate, and a roller is attached to the plate. The roller can be brought into and out of contact with the outer periphery of the cam that is rotated by precise control rotation of the motor. A web cutting apparatus characterized in that a cutting blade is moved up and down at a lowering timing controlled by precise control rotation of a motor to enable cutting at a certain length .

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