JP2912541B2 - Capper capping head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capper for capping containers such as bottles, and more particularly to an improvement in a capping head.

[0002]

2. Description of the Related Art A capping head used in a conventional capper rotates a disk made of a ferromagnetic material having a large hysteresis loss in a magnetic field of a pair of permanent magnets having alternating polarities in a circumferential direction. A non-contact torque limiter having a freely interposed structure, more specifically, a hysteresis clutch is configured. The cap restrained and held by the air chuck is capped on the container by the set torque of the hysteresis clutch.

A capping head of a capper having such a hysteresis clutch is disclosed in, for example, Japanese Patent Application Laid-Open No. 2-7 / 1990.
No. 2090 has been proposed. The capping head described as an example in the publication constitutes two hysteresis clutches in the axial direction of the chuck spindle to increase the set torque for capping. Further, in the same publication, one or more hysteresis clutches are constituted by the shape and material of the container or cap, or the magnetizing force of the disk is adjusted by changing the relative position of the poles of the permanent magnets facing the hysteresis clutch. It is further described that the set torque for capping can be adjusted in multiple steps by adjusting the gap between the permanent magnet of the hysteresis clutch and the disk.

[0004]

The capping head of the conventional capper employs a structure in which two hysteresis clutches are arranged in order to obtain a large set torque for capping. However, a ferromagnetic material having a large hysteresis loss is used. In recent years, body materials have been very expensive, and there is a problem that capping heads cannot be provided at low cost. In the case of a capping head having one hysteresis clutch, the device must be enlarged in order to obtain the set torque, and the problem of providing the capping head at low cost cannot be solved.

Further, the set torque for capping is adjusted by changing the relative position of the permanent magnet of the hysteresis clutch and the gap in the magnetic circuit of the permanent magnet. Although effective as adjusting means, they cannot be employed as capping heads for many containers with these adjusting means. That is, in the capping head that requires a large set torque, the magnetizing force of the permanent magnet and the outer diameter of the disk must be increased, or a structure in which a plurality of hysteresis clutches are arranged must be adopted. If it is a torque booster, the design must be changed to a capping head that obtains the set torque according to the shape and material of the container and cap, and the versatility of the hysteresis clutch, which is a non-contact type torque limiter, is poor and economical There is a problem that is not the target.

SUMMARY OF THE INVENTION It is a first object of the present invention to provide an inexpensive capping head for a capper having a large set torque without changing the structure of a non-contact type torque limiter. Further, according to the present invention, the capping of the versatile non-contact type torque limiter can obtain a set torque according to the shape and material of the container and the cap without changing the structure of the non-contact type torque limiter. A second object is to provide a head.

[0007]

According to a first aspect of the present invention, there is provided a hollow shaft in which a driven shaft having a cap holding and holding member attached to a lower end portion is vertically movably inserted. On a shaft-shaped drive shaft, a disk made of a ferromagnetic material axially attached to the drive shaft, and a pair of alternating polarities in the circumferential direction facing each side of the disk with a predetermined gap therebetween. A non-contact type torque limiter having a permanent magnet and a pair of yokes each of which is individually fixed and supported on the drive shaft via a bearing and connected to a drive unit of a capper; and A sun gear mounted on the shaft, a plurality of planetary gears meshing with the sun gear,
A torque booster mechanism having an internal gear engaged with these planetary gears, and a shaft mounted so as to be able to rotate only integrally with the driven shaft, supported on the drive shaft via a bearing, and each planetary gear of the planetary gear; A coupling having a shaft implanted therein, wherein the internal gear of the torque booster is connected to a yoke of the non-contact type torque limiter.

Further, in the second invention, the internal gear of the torque booster according to the first invention is disconnected from the yoke of the non-contact type torque limiter and is connected to the non-rotating member to prevent rotation. It is characterized by having been done.

In a third aspect of the present invention, there is provided a drive shaft, a driven shaft having a cap holding and holding member mounted on a lower end portion of the driven shaft, which is vertically movably butted on the same axis as the drive shaft; A disk made of a ferromagnetic material attached to a shaft, a pair of permanent magnets alternately arranged in the circumferential direction facing each side of the disk with a predetermined gap therebetween, and these permanent magnets are individually A non-contact type torque limiter fixed to the drive shaft and supported by the drive shaft via a bearing and coupled to a drive unit of a capper; a sun gear shaft mounted on the drive shaft; A plurality of planetary gears meshing with gears, a torque booster mechanism having internal gears meshing with these planetary gears, and a shaft mounted so as to be able to rotate only integrally with the driven shaft through a bearing on the drive shaft via a bearing Supported Both a coupling each planet shaft is implanted in the planetary gear, characterized in that the internal gear of the torque force multiplier coupled to the non-contact type torque limiter yoke.

In the fourth invention, the internal gear of the torque booster according to the third invention is disconnected from the yoke of the non-contact type torque limiter and is connected to the non-rotating member to prevent rotation. It is characterized by having been done.

[0011]

The rotation of the yoke of the non-contact type torque limiter connected to the drive unit of the capper is driven through a disk made of a ferromagnetic material having a large hysteresis loss and inserted in the magnetic field of a pair of permanent magnets. Transmitted to the shaft. Further, the rotation is transmitted to the driven shaft from the sun gear of the torque booster which is mounted on the drive shaft via the planetary gear and the coupling. Then, the cap set on the restraint holding member mounted on the driven shaft is fastened to the screw portion of the container.

The tightening force of the cap is determined by the set torque of the non-contact type torque limiter and the gear ratio of each gear of the torque booster. When the capping of the cap to the container is completed, the tightening force is applied to the rotating shaft. Since the overload occurs and the planetary gear of the torque booster stops revolving around the drive shaft, the rotation transmission by the non-contact torque limiter is interrupted.

[0013]

1 shows an embodiment of a capping head of a capper according to the present invention, and is a partially sectional front view. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along line BB of FIG.
It is a line sectional view. Hereinafter, embodiments will be described with reference to these drawings. The capping head 1 of the illustrated capper is one in which the entire apparatus is vertically moved up and down and has a cap restraining and holding member formed of an air chuck (not shown) at the lower end. The capping head 1 has a hollow shaft-shaped drive shaft 4 fitted through a bearing 3 to a driven shaft 2 composed of a chuck spindle on which the restraining holding member is mounted at a lower end portion. The non-contact type torque limiter 5, the torque booster 6, and the coupling 19 are arranged on the reference numeral 4.

The non-contact type torque limiter 5 is a disk-shaped disk 7 made of a ferromagnetic material having a large hysteresis loss, which is axially mounted by being fitted and fixed to the drive shaft 4.
And a drive shaft 4 for the disk 7 via a collar 8.
And a pair of first and second yokes 10 and 11 rotatably supported on the drive shaft 4 by a pair of bearings 9 fitted to the first and second yokes 10 and 11. First and second permanent magnets 12 and 13 facing the disk 7 with a predetermined gap are individually fixed to the surface facing the disk 7. That is, the non-contact type torque limiter 5 is a hysteresis clutch, and as shown in FIG. 2, a hysteresis loss is generated in the magnetic field of the same first permanent magnet 12 and second permanent magnet 13 whose polarity in the circumferential direction is alternately changed. The disk 7 is made of a ferromagnetic material having a large size.

Reference numeral 14 denotes a cylindrical case made of a non-magnetic material connecting the first yoke 10 and the second yoke 11, and one opening of the case 14 is fitted to the first yoke 10. And is fixed integrally by screwing, but the other opening is adjusted by an adjusting screw 15 which is inserted through a long hole 14 a formed in the case 14 and screwed into a screw hole of the second yoke 11. , Are detachably fixed to the second yoke 11.

On the other hand, the torque booster mechanism 6 includes a sun gear 16 which is fitted to the drive shaft 4 by key fitting and is prevented from falling off, and a plurality of gears arranged around the sun gear 16 and meshing therewith. The planetary gear mechanism includes four (in the embodiment, four) planetary gears 17 and an internal gear 18 that meshes with the planetary gears 17. The planetary gear 17 includes a coupling 19 supported on the drive shaft 4 via a bearing 9a.
Is rotatably supported by a planetary shaft 20 implanted in a cylindrical portion 19a of the coupling 19, and a disk portion 19b with a boss of the coupling 19 is driven via a slide key 21 driven into the driven shaft 2. The planetary gear 17 and the coupling 19 are fitted to the shaft 2, and have a structure in which the planetary gear 17 and the coupling 19 are mounted on the driven shaft 2 so that they can rotate only integrally. In this example,
The cylindrical portion 18a of the internal gear 18 of the torque booster 6 is
These members are fitted to the yoke 11, and these members are integrally fixed by pins 22.

The capping head 1 of the capper having such a structure is fitted to the driven shaft 2 via a seal member through a supply port 23a of an air supply member 23 positioned by a pair of retaining rings. 2 is a structure for supplying a working fluid to a cap holding member formed of an air chuck (not shown) through a flow path (not shown) formed in the air chuck 2.

In the capping of the cap onto the screw portion of the container by the capping head 1 which has been lowered, a compression coil spring 24 for pressing the rotating shaft 2 downward in the screwing direction of the cap is provided above the capping head 1. Are located. The compression coil spring 24 is opposed to an end face of the drive shaft 4 via a damper member 25 and is fixed to the driven shaft 2 with a screw 26. It is interposed between an upper spring receiving member 30 fitted via a bearing 29 to a spring cover 28 to be stopped.

The capping head 1 of the capper according to one embodiment having the above-described structure is illustrated while lowering the capping head 1 on a screw portion of a container set on a container receiving table (not shown). The first yoke 1 connected to the drive unit of the capper via a coupling (not shown) is fitted to the cap held and held by the air chuck.
When the rotation of 0 is transmitted to the driven shaft 2, the cap is fastened to the threaded portion of the container.

That is, the capping head 1 is moved by the rotation of the drive unit of the capper to the first yoke 10 and the case 14.
The second yoke 11 and the internal gear 18 rotate integrally. Also, the disk 7 interposed in the magnetic field of the pair of first and second permanent magnets 12 and 13 is magnetized, and the first yoke 10 and the second yoke 10
Since the sun gear 16 is integrally rotated with the yoke 11, the sun gear 16 mounted on the drive shaft 4 is also rotated in the same direction as the internal gear 18 like the disk 7. Since the planetary gear 17 meshing with the sun gear 16 and the internal gear 18 revolves around the driven shaft 2, the cap is fastened to the screw portion of the container at the same rotation speed as the rotation of the driving portion of the capper. Will be done.

In other words, the cap is tightened in accordance with the set torque of the non-contact type torque limiter 5. In the capping head 1 of this embodiment, the cap is tightened to the threaded portion of the container. Immediately before completion, the planetary gear 17 that has revolved around the driven shaft 2 is stopped by a load (overload on the driven shaft 2) that is equal to or greater than the tightening torque of the cap. Then, the planetary gear 17 rotates together with the internal gear 18 that rotates integrally with the drive unit of the capper, and the disk 7 that is axially mounted on the drive shaft 4 together with the sun gear 16 becomes a pair of the first and second permanent magnets 12.・
13, the first and second yokes 10 and 11 which rotate integrally with the drive unit of the capper rotate in the opposite direction.

That is, in the capping head 1, the planetary gear 17 is in a locked state in which the planetary gear 17 does not revolve or rotate immediately before the cap is completely fastened to the thread portion of the container, and the capping head comprises only one non-contact type torque limiter. Cap tightening force larger than the head can be obtained. Material properties of the disk 7 and permanent magnets 12 ・ 1
According to one test conducted by the applicant, the torque boosting mechanism 6 depends on the magnetizing force of the gear 3 and the number of teeth of each gear 16, 17, and 18.
With this configuration, it was possible to obtain more than twice the tightening force.

The set torque of the non-contact type torque limiter 5 is adjusted by loosening the adjusting screw 15
When the second permanent magnet 13 and the second permanent magnet 13 are opposed to each other with the same polarity, the magnetization of the disk 7 is saturated, so that the maximum set torque can be obtained. Conversely, if the first permanent magnet 12 and the second permanent magnet 13 are opposed to each other, the minimum set torque is obtained.

Next, a capping head of a capper according to another embodiment of the present invention will be described. FIG. 4 is a cross-sectional view of only the right half of the capping head. The same components as those of the capping head 1 of FIG. The capping head 31 of the capper includes a non-contact type torque limiter 5, a torque booster mechanism 6, and a coupling 19 on the drive shaft 4, similarly to the capping head 1. A structure in which the tooth gear 18 is connected to a non-rotating member 32 supported on a container receiving base (not shown) so as to be able to move up and down and is prevented from rotating, and a compression that presses the driven shaft 2 downward in the screwing direction of the cap. The structure in which the coil spring 24 is interposed between the spring receiver 33 screwed and fixed to the driven shaft 2 and the disk portion 19b of the coupling 19 is different.

The capping head 31 of the capper having such a structure is provided with the first yoke 10, the case 14 and the case 14 of the non-contact type torque limiter 5 in which the rotation of the drive unit of the capper is performed.
Since the power is transmitted to the second yoke 11, the sun gear 16 of the torque booster 6 is mounted on the drive shaft 4 via the disk 7 magnetized by the pair of first and second permanent magnets 12 and 13.
Also rotate. Then, since the planetary gear 17 revolves around the driven shaft 2 while rotating, the cap restrained and held by the air chuck mounted on the lower end of the driven shaft 2 is fastened to the screw portion of the container. That is, in the capping head 31, the rotation of the driving portion of the capper is reduced by the torque booster mechanism 6 via the non-contact type torque limiter 5, so that the tightening torque of the cap by the driven shaft 2 is increased. ing.

When the planetary gear 17 stops revolving due to a load greater than the tightening torque of the cap (overload of the driven shaft 2), the planetary gear 17 rotates with the internal gear 18 which has been prevented from rotating. Is also stopped and enters the locked state. Therefore, the non-contact type torque limiter 5 includes the first and second yokes 10 connected to the drive unit of the capper.
The disk 7 is stopped against the rotation of 11, and the rotation transmission is interrupted.

Next, a capping head of a capper according to still another embodiment of the present invention will be described. FIG. 5 is a cross-sectional view of only the right half of the capping head, and the same reference numerals are given to the same components as those of the capping head in FIGS. The capping head 34 of the capper includes a rod-shaped drive shaft 35,
A driven shaft 36 is mounted on the same axis as the driven shaft so as to be movable up and down, and has a lower end to which a cap retaining member (not shown) is attached. The inner step 37b of the flanged cylindrical member 37a of the coupling 37
The damper member 3 fixed to the driven shaft 36 with the screw 38
9 is hooked. The other structure is different only in that the non-contact type torque limiter 5, the torque booster 6, and the coupling 37 are disposed on the rod-shaped drive shaft 35.

Since the capping head 34 of the capper having such a structure has the internal gear 18 connected to the second yoke 11 by the pin 22, the capping head 34 has the same operation as the capping head 1 of FIG. 1. This capping head 3
4 has the same function as the capping head 31 of FIG. 4 if the internal gear 18 is disconnected from the second yoke 11 and is prevented from rotating.

[0029]

As described in detail above, in the capping head of the capper according to the present invention, in the first to fourth inventions, the non-contact type torque limiter, the torque boosting mechanism and the coupling are provided on the drive shaft. Because it was arranged structure,
The tightening torque of the cap can be increased by the torque boosting mechanism without changing the design of the non-contact type torque limiter, and the device can be provided at a lower cost as compared with a capping head or the like in which two non-contact type torque limiters are arranged. In addition, when setting the tightening torque of the cap according to the shape and material of the container and cap, it is only necessary to incorporate a torque booster mechanism designed to the ratio of the number of teeth that matches the torque, and especially to design a non-contact type torque limiter Since there is no change, it is possible to provide a versatile capping head of the non-contact torque limiter.

In the first and second aspects of the present invention, the non-contact type torque limiter, the torque boosting mechanism and the coupling are arranged on the drive shaft, and the drive shaft is a hollow shaft and the lower end is provided with a cap. Since the driven shaft on which the restraint holding member is mounted is inserted vertically movably into the hollow shaft, the driven shaft side can be retrofitted to the drive shaft side, and the capping head Productivity can be improved.

Further, in the third and fourth inventions, the non-contact type torque limiter, the torque boosting mechanism and the coupling are arranged on the drive shaft, and the cap holding and holding member is provided at the lower end. Since the mounted driven shaft is butt-arranged on the same axis as the driving shaft so as to be movable up and down, the driven shaft side can be retrofitted to the driving shaft side to produce the capping head. Performance can be improved.

[Brief description of the drawings]

FIG. 1 is a front view of one embodiment of the present invention, in which a part of a capping head of a capper is sectioned.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is another embodiment of the present invention, and is a cross-sectional view of only the right half of the capping head of the capper.

FIG. 5 is still another embodiment of the present invention, and is a cross-sectional view of only the right half of the capping head of the capper.

[Explanation of symbols]

 Reference Signs List 2 driven shaft 4 drive shaft 5 non-contact torque limiter 6 torque booster 7 disk 10 first yoke 11 second yoke 12 first permanent magnet 13 second permanent magnet 16 sun gear 17 planetary gear 18 internal gear 19 cup Ring 35 Drive shaft 36 Driven shaft

Claims (4)

(57) [Claims] 1. A ferromagnetic material mounted on a hollow shaft-shaped drive shaft in which a driven shaft having a cap holding and retaining member attached to a lower end thereof is vertically movably inserted. A pair of permanent magnets of opposite polarity in the circumferential direction that are opposed to each side of the disk with a predetermined gap therebetween, and these permanent magnets are individually fixed and are mounted on the drive shaft. A non-contact type torque limiter having a pair of yokes that are supported and connected to a drive unit of the capper, a sun gear that is axially mounted on the drive shaft, and a plurality of planetary gears that mesh with the sun gear. A torque booster mechanism having an internal gear engaged with these planetary gears, and a shaft mounted so as to be able to rotate only integrally with the driven shaft, supported on the drive shaft via a bearing, and each planetary gear of the planetary gear; The shaft was implanted Constitute a Ppuringu, the torque force multiplier capping head of capper, characterized in that the internal gear and coupled to the non-contact type torque limiter York. 2. The internal gear of the torque booster mechanism is disconnected from a yoke of the non-contact type torque limiter and is connected to a non-rotating member to prevent rotation. 2. The capping head of the capper according to 1. 3. A drive shaft, a driven shaft having a cap holding and holding member mounted on a lower end portion of the driven shaft, which is butt-moved up and down on the same axis as the drive shaft, and is mounted on the drive shaft. A disk made of a ferromagnetic material, a pair of permanent magnets which alternately have opposite polarities in the circumferential direction facing each side of the disk with a predetermined gap therebetween, and these permanent magnets are individually fixed and A non-contact type torque limiter having a pair of yokes supported on a drive shaft via bearings and connected to a drive unit of a capper, a sun gear axially mounted on the drive shaft, and a plurality of meshing meshes with the sun gear. A torque booster mechanism having a planetary gear, and an internal gear meshing with the planetary gears; a shaft mounted so as to be able to rotate only integrally with the driven shaft; and a planetary gear supported by the drive shaft via a bearing, and Each of gears And a coupling star shaft is implanted, the torque force multiplier capping head of capper, characterized in that the internal gear and coupled to the non-contact type torque limiter York. 4. The internal gear of the torque booster mechanism is disconnected from a yoke of the non-contact type torque limiter and is connected to a non-rotating member to prevent rotation. 3. The capping head of the capper according to 3.