Patent Application
20080110574
1. Field of the Invention
The present invention relates to a sealing and cutting device for a pocket coil row which efficiently cuts a pocket coil spring row to be incorporated and used in furniture such as a chair or a sofa or bedding such as a bed mattress into lengths suitable for the use without waste.
2. Description of the Related Art
Conventionally, as shown by the reference numeral 4 in
In view of the above-described point, an object of a sealing and cutting device for a pocket coil row according to the invention is not to form the empty pockets that contain no coil spring to eliminate the waste of nonwoven cloth and increase the capacity of production.
To achieve the object, the sealing and cutting device for a pocket coil row according to the invention seals and cuts a serial pocket coil row formed in a row in which coil springs are housed one by one in each of connected cylinders in pocket shapes made of nonwoven cloth or fabric every arbitrarily preset number of cylinders, characterized by: sealing means for double-sealing, cutting means for cutting a portion between the double seals by moving a cutting blade, and conveying means for conveying the pocket coil row.
In addition, according to the sealing and cutting device of the invention, the sealing means is an ultrasonic welder having a horn with a narrow groove for passage of a cutting blade, the sealing means is provided with an impulse heater wire on both sides of a cutting blade running line, a converter horn of the ultrasonic welder has a mechanism that moves up and down by about ½ or more of the coil spring diameter, the ultrasonic welder includes an upper die and a lower die and the lower die has a mechanism that moves up and down by about ½ or more of the coil spring diameter, or the ultrasonic welder includes an upper die and a lower die and the lower die is divided into two and the cutting blade is movable at the dividing center.
According to a conventional method, to prevent popping-out of coil springs described above, an empty pocket 4 that contains no coil spring is formed as shown in
An embodiment of the invention will be described with reference to the drawings.
The reference numeral 1 in the drawings denotes a serial pocket coil spring row, and the reference numeral 20 in the drawings denotes a conveyor for conveying the serial pocket coil spring row.
The ultrasonic device is composed of a converter 11, the horn 10, and a power supply (not shown).
The converter 11 and the horn 10 are anchored by screws, and the converter 11 is connected to the power supply (not shown) by a cable.
The converter 11 is anchored to a sliding portion of a cylinder 12 and structured to be movable up and down, and its vertical movement amount is set to be substantially not less than ½ of the pocket coil spring diameter so as not to inhibit the conveyance of the pocket coil spring row 1.
On the lower end portion of the horn 10, a groove 10a through which a cutter knife 15 passes is formed.
Concerning the anvils, the right anvil 14a and the left anvil 14b are disposed symmetrically so as to allow the cutter knife 15 to pass through.
The right anvil 14a is anchored to a supporting plate 23a, and the supporting plate 23a is fixed to a cylinder base 25.
The left anvil 14b is anchored to the supporting plate 23b, and the supporting plate 23b is fixed to the cylinder base 25.
The cutter knife 15 is fixed to a cutter knife attaching base 21 by a cutter knife holder 22, and the cutter knife attaching base 21 is fixed to a slider base of a rodless cylinder 16.
The cutter knife 15 is structured to run between the right anvil 14a and the left anvil 14b.
The cylinder base 25 is fixed to the cylinder rod base 27 of the cylinder 17 and structured to move up and down, and its vertical movement amount is set to be not less than about ½ of the pocket coil spring diameter so as not to disturb conveyance of the pocket coil spring row 1.
When the horn 10 is at the raised position and the anvils 14a and 14b are at the lowered positions, the conveyor 20 rotates to convey the pocket coil spring row 1 on a conveyor belt 18.
At this time, the number of springs is sensed by a sensor 13, and the conveyor 20 is stopped at a number preset in the counter.
Next, the horn 10 is lowered, and simultaneously, the anvils 14a and 14b are raised, and nonwoven cloth between the pocket coil spring and the pocket coil spring adjacent to each other is sandwiched by the lower surface of the horn 10 and the upper surfaces of the anvils 14a and 14b.
Thereafter, by turning the power supply of the ultrasonic device ON to make the horn 10 to generate ultrasonic waves, right sealing 6a and left sealing 6b are simultaneously performed as shown in
Substantially simultaneously with this, the rodless cylinder 16 works to move the cutter knife 15, and this cutter knife 15 cuts a cutting line 7 between the right sealing 6a and the left sealing 6b.
Therefore, the left pocket coil of the pocket coil springs adjacent to each other across the cutting line 7 is closed by the left sealing 6b, and the right pocket coil spring is closed by the right sealing, so that the coil springs are prevented from popping out even when the cutting line 7 is cut.
If the right sealing 6a and the left sealing 6b are not made, when the cutting line 7 is cut, either of the adjacent pockets bursts and the coil spring in the pocket pops out.
According to the conventional method, to prevent popping-out of a coil spring described above, as shown in
According to this method, impulse heater wires 36a and 36b are disposed on the upper surfaces of the right anvil 37a and the left anvil 37b, respectively, and by these impulse heater heats, the right sealing 6a and the left sealing 6b are formed, and other structures are substantially the same as those of the ultrasonic sealing method described above, so that description thereof is omitted.
