JPH07100795A - Cut of ultrasonic sheet - Google Patents

Abstract

PURPOSE:To install a screw fixing mechanism which is relatively large-sized and stout without giving an influence on the vibration characteristic by approaching the top end surface of the horn of an ultrasonic vibration element interposing a sheet as the cut object which is transferred to the top end part of a cutting tool which is fixed. CONSTITUTION:A sheet S such as a cloth as cut object is nipped between a cutting tool 12 and the top end surface of a horn 11. In this state, the top end surface of the horn 11 is pressed by a proper contact pressure at the top end part of the cutting tool 12 by raising a board 13 by a proper raising device 14 which utilizes a hydraulic mechanism, electric motor, etc. Then, the ultrasonic wave vibration of the horn 11 is started, and the sheet such as a cloth is transported in the vertical direction to the paper surface, and the cutting of the sheet S is started. Since a screw fixing mechanism 15 for fixing the cutting tool 12 with the board 13 is large-sized, the breakage due to vibration is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic sheet cutting method used for cutting sheets such as cloth in a sewing process.

[0002]

2. Description of the Related Art Conventionally, an ultrasonic sheet cutting method has been used as a method for cutting cloth or the like in a sewing process. In this ultrasonic sheet cutting method, as shown in FIG. 2, a cutting tool 22 is firmly fixed to the tip of a horn 21 of an ultrasonic vibrator by brazing or shrink fitting, and the sheet is conveyed in a direction perpendicular to the paper surface. The pedestal 23 is made to approach the cutting tool 22 by the elevating mechanism 24 while interposing S. According to such an ultrasonic sheet cutting method, since the sheets are connected by the cutting tool 22 and the cut surfaces thereof are welded by ultrasonic vibration, there is an advantage that the fibers do not fray.

[0003]

In the above-mentioned ultrasonic sheet cutting method, since the tip portion of the cutting tool is gradually worn and becomes dull, the tip portion of the cutting tool fixed to the horn is appropriately cut. It is necessary to re-polish at the timing. When the size of the cutting tool decreases as the re-polishing of the tip portion is repeated, the ultrasonic wave transmission characteristics also change, so that the replacement of the ultrasonic wave is finally necessary. However, such a replacement of the cutting tool is performed by brazing or shrink fitting as described above, which is a difficult task for the user. This is because the tip of the horn becomes high in temperature due to brazing, shrink fitting, etc., so that practical iron-based horns and the like also require ancillary processing such as annealing. For this reason, it is necessary for a worker on the maker side to go to the installation site to perform replacement work, or to send the horn back to the maker side to request replacement of the cutting tool, which takes time and labor. .

If the cutting tool can be fixed to the tip of the horn by screwing, the above-mentioned problems in fixing by brazing can be solved. However, if a small screwing mechanism for fixing the cutting tool is formed in the transmission path of the ultrasonic vibration, a new problem that the screwing mechanism is easily broken by the strong ultrasonic vibration transmitted through the screwing mechanism. Occurs. If the size of the screw fastening mechanism is increased in order to prevent damage, there is a problem that the vibration characteristics deteriorate.

[0005]

According to the ultrasonic sheet cutting method of the present invention, the cutting tool is fixed on a table or the like and is conveyed to the tip of the fixed cutting tool for cutting. The horn tip of the ultrasonic transducer is made to approach while interposing the sheet.
According to a preferred embodiment of the present invention, the cutting tool is removably fixed on the table for fixing it by a relatively large screwing mechanism.

[0006]

According to the present invention, the tip surface of the horn of the ultrasonic oscillator which is brought close to the tip portion of the cutting tool fixed on the table or the like collides with the tip portion of the cutting tool as the horn extends. The sheet sandwiched between the two is cut. In this way, by fixing the cutting tool not on the horn side but on the table side deviating from the ultrasonic vibration transmission path, a relatively large and sturdy screw fastening mechanism can be provided without affecting the vibration characteristics. It is possible to install the cutting tool, and it is possible to very easily replace the cutting tool while avoiding the destruction of the screw fastening mechanism. Hereinafter, the present invention will be described in more detail with reference to Examples.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram for explaining an ultrasonic sheet cutting method according to an embodiment of the present invention, in which 11 is an ultrasonic transducer horn, 12 is a cutting tool, 13 is a table, 14 is a lifting device, 15
Is a screw. The cutting tool 12 inserts the cutting tool 12 into a receiving hole 13a formed in the base 13, and then screws a large screw 15 into a large-diameter screw hole 13b communicating with the receiving hole 13a via a washer 16. By this, it is detachably and firmly fixed to the base 13. Since it is not necessary to braze the cutting tool to the tip portion of the horn 11, super steel having a hardness higher than that of the cutting tool 12 or a titanium alloy that cannot be brazed is selected as the material.

With the sheet S such as the cloth to be cut sandwiched between the cutting tool 12 and the tip surface of the horn 11,
The tip 13 of the horn 11 is pressed against the tip of the cutting tool 12 with an appropriate contact pressure by raising the table 13 by an appropriate lifting device 14 using a hydraulic mechanism or an electric motor. After that, the ultrasonic vibration of the horn 11 is started, and the sheet S such as cloth is conveyed in a direction perpendicular to the paper surface to start cutting the sheet. Since the screwing mechanism is large, damage due to vibration is avoided.

By making the hardness of the material of the horn 11 higher than that of the cutting tool 12, wear is caused mainly on the cutting tool 12 side. The worn cutting tool 12 is mounted on the base 1.
While being fixed to No. 3, or once removed from the table 13, it is re-polished at an appropriate timing.

In the above, the construction in which the cutting tool 12 is fixed on the base 13 by a relatively large screw fastening mechanism has been illustrated. However, if the cutting tool 12 is fixed by using a larger and sturdy fixing mechanism such as a vise, the fixing mechanism can be more effectively prevented from being broken by ultrasonic waves.

Further, a configuration has been exemplified in which the cutting tool 12 fixed on the table 13 is brought close to the tip surface of the horn 11 by moving the table 13 up and down using the lifting device 14. However, the tip surface of the horn 11 can be configured to approach the tip portion of the cutting tool fixed to the table 13 by moving the horn 11 up and down while the table 13 is fixed.

[0012]

As described in detail above, the ultrasonic sheet cutting method of the present invention has a structure in which the cutting tool is fixed and the tip surface of the horn of the ultrasonic transducer is brought close to the tip portion. Therefore, it is possible to adopt a detachable fixing mechanism such as a large screwing mechanism or a sturdy vise, and it is possible to extremely easily replace the cutting tool while effectively avoiding the destruction of such a fixing mechanism. The effect is played.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an ultrasonic sheet cutting method according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a conventional ultrasonic sheet cutting method.

[Explanation of symbols]

 11 Ultrasonic transducer horn 12 Cutting tool 13 units 14 Lifting device 15 Screw

Claims (2)

[Claims] 1. A cutting tool is fixed, and a tip surface of a horn of an ultrasonic transducer is brought close to the cutting tool while the sheet to be cut conveyed to the tip of the cutting tool is fixed. Ultrasonic sheet cutting method. 2. The ultrasonic sheet cutting method according to claim 1, wherein the cutting tool is detachably fixed to a table for fixing the cutting tool by using a screwing mechanism.