JPH0214781Y2 - - Google Patents

Description

[Detailed explanation of the invention] "Industrial application field" This invention automatically creates continuous empty loops from the edge of the fabric, leaving the necessary length, from the edge of the fabric that has been sewn by a multi-needle double chainstitch sewing machine. The purpose of the present invention is to provide a low-cost, high-efficiency cutting device that is as simple as possible.

``Prior Art'' Conventionally, in this type of multi-needle double chain stitch sewing machine, when cutting the empty loops that appear continuously at the edge of the sewn fabric, it is necessary to manually cut them with scissors,
This method uses a known ring cutting device that operates automatically, but manual operation requires skill and time due to complicated operations, and has the disadvantage of reducing the efficiency of sewing work. The empty ring cutting device requires various complicated mechanisms to be installed as the cutting device.
It was uneconomical due to high cost. Sho Tokukai 1978-
175587 is also disclosed, but it requires a complicated device and increases the cost.
The cutting device uses a scissors cutting method with a movable blade and a fixed blade, so there are no drawbacks such as damage to the fabric if it is accidentally caught in the area, or damage if the tip of a finger comes into contact with it. It exists.

Furthermore, Japanese Patent Application Laid-Open No. 61-206484 discloses a method in which the hollow ring is cut using a sharp-pointed punch and electric heating, so that the fabric is not caught in the part. If the fabric is exposed to the heating device or the fabric comes into contact with the heating device, the fabric is damaged and the product value is reduced, and the safety of the operator is compromised.

``Problems that the invention attempts to solve'' This invention does not require the skill and time required for manual scissor cutting, is highly efficient, and does not require high costs due to complicated mechanisms like known automatic ring cutting devices. The object of the present invention is to provide a simple, economical, and highly efficient hollow ring cutting device.

"Means for solving the problem" In order to achieve the above-mentioned objective, in the present invention, a lower knife having an obtuse-angled point formed directly or indirectly on the rear part of the throat plate is fixed, and a lower knife is placed opposite to the obtuse-angled point. It is equipped with an upper knife that has a flat surface and can be moved up and down, and is driven up and down to pinch and cut an empty ring between both blades.

"Embodiments and Effects" Now, the attached drawings showing an example of implementing the present invention will be explained in detail.

Reference numeral 1 designates an arm portion of the sewing machine, and a mounting plate 17 for an air cylinder 16 as a driving source for raising and lowering the upper knife is attached to the back surface thereof. 2 is a needle bar, and a needle stopper 3 is screwed onto the lower end of the needle bar 2. The needle stopper is equipped with a plurality of needles 4. 5 is the fabric presser, 6 is the throat plate mounting screw, 7 is the sewing machine bed, 8 is the throat plate,
The rear end of the throat plate becomes a lower knife 8b that forms an obtuse tip 8a. 9 is a decorative thread looper, 10 is a cloth sliding plate,
Reference numeral 11 denotes a hollow ring formed continuously at the edge of the fabric after sewing is completed, and 12 is a presser bar, to which a fabric presser 5 is attached to the lower end. Reference numeral 13 denotes an upper knife, the bottom end of which has a flat surface 13a, and is mounted on an air cylinder 16, which is a driving source for raising and lowering the upper knife, so that it can be raised and lowered. 13b is a piston of the cylinder 16, the lower end of which is screwed into the upper knife 13, and is fixed to the upper knife 13 with a nut 13c. The vertical and tilting positions of the upper knife 13 can be adjusted using the nut 1.
The adjustment can be made by loosening 3c and rotating the upper knife 13. Numeral 14 is an air cylinder fixing nut, which functions to arbitrarily adjust the lifting stroke of the upper knife. Reference numeral 15 denotes an upper knife elevating drive source mounting plate mounting fixing screw, and 18 an air pipe, which acts to drive the air cylinder 16 which is the elevating drive source. However, if a solenoid is used instead of an air cylinder as the lifting power source, the air pipe 18 is replaced by a power cord. In this embodiment, the lower knife 8b is used to shape the rear end of the needle hole of the throat plate 8 into an obtuse angle shape. It is also possible to separately provide a block-shaped piece at the position and mold an obtuse-angled lower knife into this piece. Furthermore, the empty ring cutting surface of the upper knife was made flat, and the lower knife was made obtuse.
Even if the fabric should happen to be under the upper knife and the upper knife should descend, there is no risk of cutting the fabric or accidentally damaging the tip of the finger. In addition, when operating a solenoid or air cylinder, a switch or valve, etc. may be operated manually, or these may be operated automatically using any known technology.
It should be implemented voluntarily.

"Effects of the invention" This invention has the above-mentioned structure and function, and in particular, the upper and lower knives have a unique structure, so there is no risk of damage even if the fabric gets caught or the fingertips touch. It has a much simpler structure compared to complicated automatic devices, so it does not require large equipment costs, is low cost, and allows the cylinder to be operated appropriately by operating a switch etc. Because of this, it can be operated without any skill and is highly efficient.

[Brief explanation of the drawing]

The attached drawings show an example of the implementation of the present invention.
The figure is a perspective view of a main part, and FIG. 2 is a side view showing a state in which the upper knife is lowered by the action of an air cylinder or a solenoid and the empty ring is cut. 1... Sewing machine arm, 2... Needle bar, 3... Needle stop, 4... Needle, 5... Fabric presser, 6... Throat plate fixing screw, 7... Sewing machine bed, 8... Throat plate,
8a...obtuse-angled point, 8b...lower knife, 9...decorative thread looper, 10...cloth sliding plate, 11...empty ring,
12... Presser bar, 13... Upper knife, 13a...
Flat surface, 13b... Piston, 13c... Nut for adjusting the vertical and inclination position of the upper knife, 14... Nut for fixing the air cylinder, 15... Screw fixing the drive source mounting plate for raising and lowering the upper knife, 16... Upper knife Air cylinder serving as a driving source for lifting and lowering, 17...Mounting plate for air cylinder serving as a driving source for lifting and lowering the upper knife, 18...Air pipe or power cord.

Claims (1)

[Scope of utility model registration request] A cylinder 16 is attached to the arm 1 of the sewing machine, and the piston 13b of the cylinder 16 is equipped with an upper knife 13 whose bottom surface is formed into a flat surface 13a. A lower knife 8b having an obtuse tip 8a is placed in place, and the piston 1 is closed by a switch or a valve.
3b. A blank chain cutting device for a multi-needle double chainstitch sewing machine.