JPH0272090A - Cap screw-on apparatus - Google Patents

Abstract

PURPOSE:To permit a stable screw-on performance to be maintained for a long period of time by providing between a spindle and a chuck spindle a torque transmitting device which transmits the rotary action of the spindle to the chuck spindle by only the magnetic force. CONSTITUTION:A cap 4 held by an air chuck 5, together with a spindle 9, is moved downward onto a container 1 to be capped held by a container catcher 2 to start the screwing on. A permanent magnet 14 and a disc 13 made of ferromagnetic material in a torque clutch 19 connected with the spindle 9 are caused to operate in such manner as not to create any relative rotation therebetween to thereby produce a retention torque, by which the rotary action of the spindle 19 is transmitted to the air chuck 5, whereby the cap 4 is screwed on the neck of the container 1. A predetermined torque is produced in the torque clutch 19 by setting the rotating position of the permanent magnet 1, entirely independently of the rotation speed of the spindle 9, i.e., the slip speed of the disc 13, adjusting the clearance between the disc 13 and the permanent magnet 14 and combining such setting and adjustment, whereby the cap 4 is screwed on the container 1 at a predetermined torque.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field] The present invention relates to a device for tightening screw caps of containers for pharmaceuticals, cosmetics, foods, etc.

[Prior Art] FIG. 2 shows an example of a conventional screw type cap tightening device. Hereinafter, a conventional screw type cap tightening device will be explained based on FIG. 2.

The cap 4 is restrained and held by the air chuck 5 so that its center substantially coincides with the center of rotation of the spindle 9. The object to be rolled up, that is, the container 1, is fixed on a container holder 3 by the container holding device 2 so that the center of the cap attachment section substantially coincides with the center of rotation of the spindle 9. The air chuck 5 is connected to a chuck spindle 12, and the chuck spindle 12 is connected to a spindle 9 such that its rotation center coincides with the rotation center of the spindle 9.
is rotatably held. Between the spindle 1 and the chuck spindle 12, there is a friction type torque transmission bag @6.7.8
will be provided. The friction type torque transmission device includes a torque plate 6 that engages with the chuck spindle 12 while restricting its rotation.
and the FJ that sandwiches the circumferential flange part of the torque plate 6 from both sides.
It is composed of a friction plate 7 and a restraining plate 8 arranged between the friction plate 7 and the spindle 9. The holding plate 8 is the air chamber 10
A piston-shaped metal fitting 11 that generates thrust according to internal pressure is displaced so as to press against the friction plate 7 and the torque plate 6. As a result, torque is transmitted between the spindle 9 and the chuck spindle 12.

The spindle 9 rotates in a direction to tighten the cap 4 while lowering the cap 4 so as to come into contact with the cap mounting section of the container 1. At that time, an appropriate pressure is applied to the air chamber 10, and torque can be transmitted between the chuck spindle 12 and the rotating spindle 9, so that the cap 4 is screwed onto the container 1. go. As the tightening of the cap on the container progresses, the tightening torque of the cap on the container increases. If this winding torque becomes larger than the torque that can be transmitted by the m-friction torque transmission device @6, 7.8, the winding torque between the chuck spindle 12 and the spindle 9 is rotation occurs, and the cap is not further tightened.

The tightening torque of the screw cap 4 is determined by the transmittable torque of the irM type torque transmitting device 6, 7.8, and the transmittable torque is adjusted by the pressure applied to the air chamber 10. Usually, in such a winding device, a large number of winding units as shown above are arranged on the circumference.
The winding operation is performed while moving on the circumference of the container, so that winding of a large number of containers can proceed at the same time.

[Problems to be Solved by the Invention] In the winding device as described above, it is necessary to keep the winding torque of the cap within a specified range depending on the container.

This is because excessive tightening torque may cause damage to the container or cap, or the cap may become impossible to open, and insufficient tightening torque may cause the cap to loosen during storage or transportation, resulting in poor sealing within the container. This is because it may cause deterioration of the contents or leakage of the contents.

However, in conventional winding devices, the winding torque changes within a short period of time during operation or after a long period of operation, making it difficult to maintain an appropriate winding torque range at all times. Therefore, adjustment work must be repeated. Furthermore, the friction plate needs to be replaced due to wear.

These problems with conventional crimping devices are as follows: +1) The I friction coefficient varies greatly depending on the wear condition of the *1a material, changes in temperature, lubrication condition, generation of wear particles, etc., +2) J! This is caused by the fact that it is difficult to improve the wear of the J friction root.

SUMMARY OF THE INVENTION An object of the present invention is to provide a winding device that solves the problems associated with the generation of winding torque due to a friction depression structure.

[Means for Solving the Problems] In the present invention, a device for winding a screw-type cap onto a cap attachment part of a container is provided, and a spindle that rotates in a direction to wind up a key A7 knob, and a spindle are provided. a chuck spindle rotatably held by the spindle and having the same rotation axis as the rotation axis of the chuck spindle, and a torque transmission device interposed between the spindle and the chuck spindle to transmit the rotation of the spindle to the chuck spindle only by magnetic force; An air chuck for holding the cap, which holds the cap so that the center of the cap is on the axis of rotation of the spindle and does not rotate relative to the air chuck, and is attached to the chuck spindle. and a container holding device that holds the container so that the center of the cap of the container to be rolled up is on the axis of rotation of the spindle and restrains rotation of the container. Solved the above problems.

In addition, the magnetism-based torque transmission device has a chuck spindle made of a ferromagnetic material with a large hysteresis loss, and has a disk surface arranged in a direction perpendicular to the rotation axis of the chuck spindle, and has a thickness in the direction of the rotation axis, and the center of the spindle. It has at least one disk portion that coincides with the axis of rotation, and each of a pair of two magnets is arranged on each side of the disk in the thickness direction, and the magnets have their polarization directions substantially aligned with the circumference of the disk. The N pole of the magnet on one side of the pair of two magnets is arranged toward the direction and close to the disc surface of the disc, and the N pole of the magnet on one side is opposite to the S pole of the magnet on the other side. Place the S pole so that it faces the N pole of the other magnet,
This is achieved by fixing the magnets, each on the spindle side, and aligning at least one pair of such magnets on one circumference of the disk.

Moreover, the magnets forming a pair arranged on both sides of the disk are
In order to adjust their overlapping area, the fixing position relative to the spindle may be changed in the circumferential direction of the disk.

Further, the fixed position of the pair of magnets arranged on both sides of the disk with respect to the spindle may be changeable in the thickness direction of the disk in order to adjust the spacing between them.

Furthermore, an electromagnet may be used as the magnet, and its current value may be made variable. Further, the magnet may be a permanent magnet.

[Function 1: The i-lux transmission device using magnetism with no contact parts is 1! Unlike the i-friction torque transmission device, it does not have a friction part, so F! There are no problems caused by changes in the coefficient of friction or wear of the friction material.

In a magnetic torque transmission device, a disk made of a ferromagnetic material with a large hysteresis loss, which is provided on a chuck spindle, is placed between an N pole and a S pole that are opposite to each other with the disk in between. The side facing the north pole of the magnet becomes the south pole, and the side facing the south pole of the magnet becomes the north pole, and is magnetized. These magnetizations are opposite to the N pole across the disk and sI! ! Occurs every time. When the disk portion magnetized in this way moves away from between the north and south poles where they were previously located due to the relative rotation between the disk and the spindle, an attractive force due to magnetic force is generated between them. Also, when approaching between adjacent pairs of N and S poles facing each other across the disk, the polarization direction of the magnetized portion of the disk and the magnetic polar direction of the adjacent N and S poles are the same, so between them Repulsion due to magnetic force occurs, which acts as a force that attempts to prevent reciprocal rotation between the disc and the spindle, thereby generating a holding torque between the disc and the spindle. If the force for relative rotation is greater than the holding torque generated by the magnetic force, relative rotation will occur between the disk and spindle, and the magnetized disk portion will be affected by the magnetic field in the opposite direction to its magnetization direction. It will be placed inside. At this time, the ferromagnetic material with large hysteresis loss that makes up the disk is magnetized in the opposite direction to the direction in which it was previously magnetized, but heat is generated when the magnetic field is reversed.

This generated energy is transmitted using magnetic torque V! It is the absorbed energy of Rm. The above operations are performed continuously in the magnets arranged in the circumferential direction of the disc, and the magnetic torque transmission device performs torque transmission or energy absorption as a brake.

The operation of the magnetic one-herc transmission device will be described with respect to the operation of the screw-type cap tightening device. When winding of the cap starts, the initial winding torque is smaller than the holding torque of the magnetic torque transmission device, so the cap 4 is rotated without generating a transmission rotation difference in the magnetic torque transmission device. , are wound up as the spindle 9 rotates. As the winding progresses, a transmission rotation difference occurs in the winding device between the cap 4 and the container 1, the chuck spindle 12 stops rotating, and the holding torque of the magnetic torque transmission device is transmitted to the cap 4. By setting the holding torque of the magnetic torque transmission device to a desired winding torque value, an appropriate winding torque can be applied to the cap.

By shifting the relative positions of a pair of magnets placed on both sides of a ferromagnetic disk with large hysteresis loss in the circumferential direction of the disk, the overlapping area of these magnets in the thickness direction of the disk is changed. By increasing the magnetized volume of the disk through which the magnetic flux passes, thereby increasing the magnetic force between the magnetized disk portion and the magnets placed on both sides thereof, the holding torque of the magnetic torque transmission device increases. .

In addition, if the distance between the pair of magnets placed on both sides of a ferromagnetic disk with large hysteresis loss is increased, the magnetic flux passing through the disk will decrease, and this will cause the magnetized portion of the disk and the magnets placed on both sides to decrease. The magnetic force between the two ends decreases, and the holding torque of the magnetic torque transmission device decreases.

The transmission torque of the magnetic torque transmission device can be adjusted by either of the above two methods.

Further, the magnets disposed on both sides of the ferromagnetic disc with large hysteresis loss described above may be permanent magnets or electromagnets. If NVa stone is used, the transmission 1 to torque of the magnetic torque transmission device can be adjusted by controlling the current value passed through the electromagnet.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

A cross-sectional view of the structure of the present invention is shown in FIG. A container 1, which is an object to be wrapped, is fixed on a stand 3 by a container holding device 2, and a cap 4 is fixed on an air chuck 5. The air chuck 5 includes a chuck spindle 12, a disk 13 made of ferromagnetic material with large hysteresis loss, and a permanent magnet 1.
4. The magnet mounting plate 15 and the spindle receiver are connected to the spindle 9 via a torque clutch 19 consisting of a plate 16, a spindle mounting plate 17, and a thrust bearing 18.

The spindle 9 is rotated by a drive unit (not shown) and has a structure in which the rotation can be transmitted to the air chuck 5 via a torque clutch 19. Torque clutch 19
is a disk 13 connected to the chuck spindle 12
Permanent magnets 14 are arranged on both sides of the magnet with a certain gap between them, and the permanent magnets 14 are sandwiched between magnet mounting plates 15, and the spindle receiver is connected to a plate 16 and a spindle mounting plate 17. The rotation of the spindle 9 is transmitted via the permanent magnet 14 and the disk 13 to the air chuck 5 connected to the chuck spindle 12. The thrust bearing 18 is interposed between the chuck spindle 12 and the magnet mounting plate 15, and the disk 13 connected to the chuck spindle 12 and the permanent magnet 14 connected to the magnet mounting plate 15.
Keep the gap between the two constant.

The spindle 9 is moved up and down by an elevating cam or cylinder (not shown), and is lowered during winding and raised at other times.

Container 1, which is an object to be wrapped, fixed by container holding device 2
The cap 4 fixed to the air chuck 5 above is lowered L/ together with the spindle 9, and winding is started. Here, the permanent magnet 14 in the torque clutch 19 connected to the spindle 9 and the disk 13 made of ferromagnetic material act to prevent relative rotation and generate a holding torque. The rotating force of the spindle 9 is transmitted to the air chuck 5 by the generated holding torque, and the cap 4 is screwed onto the container 1, which is the object to be wrapped. Permanent magnet 14
can be easily rotated and fixed at a certain predetermined position by the fixing fitting 20.

At this time, by changing the rotational position of the permanent magnet 14, the volume within the disk 13 through which the magnetic flux passes changes, thereby changing the magnetic force, and the generated holding torque given by the spindle 9 can be easily varied. . In this way, the torque can be adjusted by changing the rotational position of the permanent magnet 14 in order to change the magnetized volume of the disk 13, and the air chuck 5 can be adjusted by the holding torque at a certain set rotational position of the permanent magnet 14. In a state where the disc 13 and the permanent magnet 14 slip in a stopped state,
A fixed torque is transmitted between them, and a fixed torque is applied between the container 1 and the cap 4, which are the objects to be wrapped, to perform the wrapping.

The necessary winding torque is determined by the shapes and materials of the container 1 and cap 2, which are the objects to be rolled, and therefore the torque to be applied can be adjusted by adjusting the rotational position of the permanent magnet 14.

When the disk 13 rotates, it passes through a magnetic field due to magnetic fluxes arranged on both sides of the disk, and the direction of the magnetic field is alternately reversed in the circumferential direction of the disk. For this reason, the disk 13 made of a ferromagnetic material with large hysteresis loss generates heat due to hysteresis loss, so a heat sink 21 is arranged on the side of the torque clutch 19.
The torque clutch 19 is prevented from being heated by radiating heat into the air.

In FIG. 1, permanent magnets 14 and disks 13 are arranged in two levels, one above the other. By accumulating the torque obtained in multiple stages as explained above,
The torque values obtained for each are added. That is, the required tightening torque is determined by the shape and material of the container 1 and the cap 4, which are the objects to be wrapped.
and the permanent magnet 14 in a single layer, and increase the torque in multiple stages as required. In this way, by determining the number of layers of the disk 13 and the permanent magnet 14 and the rotational position of the permanent magnet 14 according to the required torque, a stable torque can always be generated and winding can be performed. or,
It has a structure that does not require any pressurized air paths or piping like those used in conventional wrapping devices, and also does not require any external power supply or wiring. Also, there are no sliding surfaces, so
It has a structure that requires no maintenance such as cleaning, as there are no worn parts, and dust is generated due to wear unlike conventional methods.

Furthermore, the disk 13 and permanent magnet 1 described above
By widening the gap 4, the magnetic flux density passing through the disk 13 is reduced, and the torque generated during rotation of the disk 13 is reduced.

On the other hand, by narrowing the gap between the disk 13 and the permanent magnet 14, the magnetic flux density passing through the disk 13 increases, and the torque generated during rotation of the disk 13 increases. In this way, by adjusting the gap between the disk 13 and the permanent magnet 14, it is possible to increase or decrease the torque generated during the rotation of the disk 13, and it is possible to increase or decrease the torque generated during the rotation of the disk 13, and to adjust the distance between the disk 13 and the permanent magnet according to the required value of the winding torque. It has a structure in which it is possible to set a predetermined +-lux by adjusting the gap between the magnets 14 and changing the rotational position of the permanent magnet 14 in combination.

In this way, regardless of the rotation speed of the spindle 9, that is, the slip speed of the disk 13, the rotational position of the permanent magnet 14, the adjustment of the gap between the disk 13 and the permanent magnet 4° stone 14, and the combination of the two can be adjusted. , a predetermined torque is generated in the torque clutch 19, and the container 1 to be wrapped and the cap 4 can be wrapped with a predetermined torque.

[Effects of the Invention] The configuration of the present invention makes it possible to tighten the cap without changing the tightening torque over time, and also makes it possible to eliminate maintenance work such as adjusting the tightening torque and replacing parts. As a result, we have been able to provide a cap wrapping device that can maintain stable cap wrapping performance over a long period of time, which has not been possible with conventional cap wrapping devices.

In addition, by using a torque transmission device using a magnet and a ferromagnetic disk with large hysteresis loss, the structure is simpler than constructing a cap tightening device using an in-shell electromagnetic clutch or an electric motor. We were able to provide a cap tightening device that is suitable for

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of a winding device of the present invention, FIG. 2 is a partial cross-sectional view of a conventional winding device, and FIG. 3 is a schematic diagram showing the arrangement of magnets of a torque transmission device, and shows the generated torque. FIG. 4 is a schematic diagram showing the arrangement of magnets of the torque transmission device, and is a diagram showing a state when increasing the generated torque. 1... Object to be rolled up 2... Container holding device 3.
... Container holder is stand 4 ... Cap 5 ... Air chuck 6 ... Torque plate 7 ... Friction plate
8... Holding plate 9... Spindle 1o.
... Air to air 11 ... Piston-shaped metal fitting 12 ... Chuck spindle 13 ... Disk 14 ... Permanent magnet 15 ...
...Magnet mounting plate 16...Spindle holder is plate 17
...Spindle mounting plate 18...Thrust bearing 19...Torque clutch 20...Fixing metal fittings 21...
・・Heat sink

Claims (5)

[Claims] (1) A device for tightening a screw-type cap onto the cap attachment part of a container, which includes a spindle that rotates in the direction of tightening the cap, and a spindle that has the same rotation axis as the spindle and is rotatable. a torque transmitting device interposed between the spindle and the chuck spindle to transmit the rotation of the spindle to the chuck spindle only by magnetic force, and an air chuck for holding the cap. The air chuck attached to the chuck spindle and the center of the cap attaching part of the container to which the cap is screwed are A cap tightening device comprising: a container holding device that holds a container on the rotational axis of a spindle and restrains rotation of the container. (2) The cap screwing device according to claim 1, which transmits torque only by magnetic force, has a chuck spindle made of a ferromagnetic material with a large hysteresis loss. At least one disk portion having a disk surface arranged in a direction perpendicular to the rotational axis of the spindle, having a thickness in the direction of the rotational axis, and whose center coincides with the rotational axis of the spindle, and on each side of the disk in the thickness direction. , each of a pair of two magnets is arranged, the polarization direction of the magnet is directed approximately in the circumferential direction of the disk, and the magnet is arranged close to the disk surface of the disk, The north pole of the magnet on one side is opposite the south pole of the magnet on the other side, and the south pole of the magnet on one side is the north pole of the magnet on the other side.
A cap winding device arranged opposite to the poles, the magnets each being fixed to the spindle side, and at least one pair of such magnets being aligned on one circumference of the disk. (3) The cap tightening device according to claim 2, wherein the overlapping area of two magnets forming a pair of torque transmitting devices in the thickness direction of the disk is the circumference of the disk. A cap cinching device which is adjusted by changing the relative position of two magnets forming a pair in direction, thereby adjusting the transmitted torque of the torque transmitting device. (4) In the cap tightening device according to claim 2, the distance between the two magnets forming the pair of the torque transmitting device in the thickness direction of the disc is adjusted, thereby: A cap screwing device that adjusts the transmission torque of a torque transmission device. (5) The cap tightening device according to claim 2, wherein the magnet used in the torque transmission device is an electromagnet, and the torque is transmitted by adjusting the amount of current flowing through the coil of the electromagnet. A cap screwing device that adjusts the transmission torque of the device.