JPS6156689A - Cloth cutter of hole stitching sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a fabric cutting device for a hole sewing machine that absorbs engagement errors of a fabric cutting knife and provides stable fabric cutting performance.

[Prior art]

A conventional sewing machine of this type is shown in FIG.

In the figure, 1 is the sewing machine head including the cloth cutting machine operating arm 7, 2 is the table stand, 3 is the motor that drives the sewing machine head 1, and 4 is the rotation from this motor 3 to the sewing machine head 1. A transmitter is used to turn on and off the transmission, 5 is a bed, and 6 is a base that supports the sewing machine head 1 and the ped 5.

Next, referring to FIG. 2, the mechanism of the female part of the conventional cloth cutting mechanism will be explained. In the figure, 11 is a hammer operating arm, 12 is a clamp that fixes the upper knife 14, 13 is a bottle that supports this clamp 12, 14 is an upper knife, 15 is a lower knife, and 16 is a knife stand.

Next, operation 9 will be explained. When the power switch is turned on and the sewing machine is started, the cloth cutting machine is connected to the machine arm 11 during the cloth cutting process (due to the acting force from a drive source (not shown)) and fixed to the machine machine arm 11. The upper knife 14 lowers and is attached to the knife table 16 and engages with the lower knife 15 at ℃ to cut the cloth.

Since the cloth cutting device of a conventional sewing machine is configured as described above, it is necessary that the blade surfaces of both knives are in perfect pressure contact when the upper and lower knives are engaged, and that the blade surfaces of both knives are in perfect contact with each other in the height direction. In order to adjust the dimensions accurately, it was essential to use a knife to fit together, which required a great deal of effort and advanced technology.

Goodbye, the upper knife is often replaced when changing the length of the buttonhole, and in this case, the replacement upper knife also requires the troublesome work of adjusting the knife each time, which reduces work efficiency. It was bad.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by making it possible to finely adjust one knife in the height direction with respect to the blade surface of the other knife,
To provide a cloth cutting device for a hole sewing machine capable of correcting and correcting a meshing error occurring between both knives.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. In FIGS. 3 and 4, the same or corresponding parts as in FIGS. 1 and 2 are designated by the same reference numerals. The clamp is supported and fixed to the hammer operating arm 11, and its tip engages with an engagement groove 19a of the upper knife 19, which will be described later, to hold the upper knife 19 movably in the vertical direction.

Reference numeral 18 denotes a cam that is moved in the horizontal direction by a YJF4 setting screw 17 that passes through the inside, and the lower end of the cam is formed to be inclined in the shape of a wedge. 19 is the long groove 19a as described above.
The upper knife is held movably in the horizontal direction by a support clamp 12 via the upper cam contact surface 1 of the upper knife.
9b is formed to be inclined in a wedge shape in the direction opposite to that of the cam 18, and moves up and down in response to the movement of the cam 18 in the horizontal direction. 20
is a locking nut for the adjusting screw 17, and 21 is a holder/stopper for the adjusting screw 17, which is fixed to the hammer operating arm 11. Reference numeral 22 denotes a spring that is elastically attached between the holder/stopper 21 and the cam 18, and presses the cam 18 to the left.

Next, the operation of this invention will be explained. Turn on the power,
During a series of sewing operations, the hammer operating arm 11 descends, and the upper knife 19 and lower knife 15 engage with each other to perform a cloth cutting operation.

At this time, there are times when the two blade surfaces of the upper knife 19 and the lower knife 15 do not come into contact with each other accurately due to machining accuracy and assembly errors.

However, in this invention, in order to correct this, the wedge-shaped cam 18 is compressed and fixed in one direction by a screw 17 supported by a holder 21 and a spring 22, and has a cam contact surface 19b at the lower end. It is in contact with the upper knife 19. Therefore,
When the screw 17 is rotated, the cam 18 moves as shown in FIG.
Move to the right side and move by the height of the slope of that cam 18.
The upper knife 19, which has a cam contact surface 19b having the same slope, moves up and down in parallel, so that the gap between the upper knife 19 and the lower knife 15 can be adjusted, and meshing errors can be corrected.

〔Effect of the invention〕

As described above, according to the present invention, one knife is supported so as to be finely adjustable in the height direction with respect to the blade surface of the other knife. This eliminates the need for the advanced female thread assembly technology and labor required by contractors, and can be handled by the customer or user. Sara-K allows the user to adjust the engagement when replacing the knife in use with a new part, which has the effect of reducing parts costs, improving work efficiency, and improving cloth cutting function.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the external appearance of a conventional hole sewing machine, Fig. 2 is a front view of the female part of a conventional cloth cutting mechanism, Fig. 3 is a front view of an embodiment of the present invention, and Fig. 4 is a perspective view of the conventional hole sewing machine. FIG. 1 is a perspective view of an embodiment of the invention. 11... Hammer operating arm, 15... Lower knife, 18.
...Cam, 19...upper female. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent Applicant: Mitsubishi Electric Co., Ltd. Bi 2 District Fan 3 Tu Ma 4 Procedural Amendment (Voluntary)

Claims (2)

[Claims] (1) A fabric cutting device for a hole sewing machine in which a pair of knives mesh to cut fabric, characterized in that one of the knives is supported so as to be finely adjustable in the height direction relative to the blade surface of the other knife. Cloth cutting device for hole sewing machine. (2) One knife is movably supported by a wedge-shaped cam supported movably in the horizontal direction on the hammer operating arm, and by moving and adjusting the cam, the other knife is moved. A fabric cutting device for a hole sewing machine according to claim 1, characterized in that the blade surface can be finely adjusted in the height direction.