JPH06129922A - Torque detection device of container treatment apparatus - Google Patents

Abstract

PURPOSE:To prevent the torque detection accuracy of a torque tension device from being dropped even when a capper is operated repeatedly and to maintain a cap- shutting (-opening) torque to be definite by a method wherein a planetary gear mechanism is used as the torque detection device. CONSTITUTION:A cap-shutting torque is input to a control device in advance, a servometer is driven, a capping head is turned, and a cap is attached to the upper end of a container. That is to say, when the servomotor is driven by the control device, a sun gear 13 is turned to the clockwise direction by being interlocked with its driving shaft, individual planetary gears 14 are rotated to the counterclockwise direction, they are simultaneously revolved to the clockwise direction around the sun gear 13 and the capping head which is interlocked with it is turned to the clockwise direction. When the cap has been attached, a rotary force, in the counterclock direction, which acts on a protrusion 15a at an internal gear 15 is detected by a load cell 17, it is output to the control device, and the servomotor is controlled in such a way that a cap-shutting troque becomes a set value. Since a planetary gear mechanism is used instead of an elastic ring, the accuracy of the cap-shutting torque is not lowered even when the title device is operated repeatedly.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque detecting device for a container processing device, for example, a torque detecting device for detecting a capping torque in a capper.

2. Description of the Related Art Conventionally, as a capper, a capping head for attaching a cap to a container in association with a motor as a drive source and a torque detecting device for detecting a capping torque of the capping head when attaching the cap to the container are provided. Are known (for example, the actual exploitation Sho 63-218
34 publication). In the capper of the above publication, the torque detection device includes a pin connected to the body of the motor, a flexible ring provided on a fixed frame and engaged with the pin, and an elastic deformation amount of the flexible ring when the cap is attached. And an optical sensor for detecting. When the cap is attached to the container by the capping head, the elastic deformation amount of the flexible ring is detected by the optical sensor to detect the capping torque.

However, in the capper of the above publication, the spring multiplier of the flexible ring gradually changes as the capper is repeatedly used, and accordingly, the torque detection is performed. There is a drawback in that the accuracy of torque detection by the device deteriorates.

[Means for Solving the Problems] In view of such circumstances,
The present invention relates to a container processing apparatus, comprising: a processing head that attaches a cap to a container in association with a motor that is a drive source; and a torque detection device that detects a capping torque of the processing head when the cap is attached to the container. A torque detection device, a sun gear that interlocks with the drive shaft of the motor,
A planetary gear that meshes with the sun gear and is interlocked with the processing head, an internal gear that meshes with the planetary gear, and a frame that fixes the internal gear and the motor are provided over the internal gear. And a detection means for detecting the acting rotational force. Further, the present invention provides a container processing apparatus including a processing head that removes a cap from a container in association with a motor that is a drive source, and a torque detection device that detects a capping torque of the processing head when the cap is removed from the container. In the above, in the torque detection device, a sun gear that interlocks with the drive shaft of the motor, a planetary gear that meshes with the sun gear and interlocks with the processing head, an internal gear that meshes with the planetary gear, and The detection device is provided over the internal gear and the frame to which the motor is fixed, and includes a detection unit that detects a rotational force acting on the internal gear.

According to this structure, the planetary gear mechanism is used as a component of the torque detecting device instead of the conventional engaging pin and the flexible ring, so that the torque can be detected even if the capper is repeatedly used. Accuracy does not decrease. Therefore, it is possible to prevent a decrease in torque detection accuracy.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIGS. 1 and 2, reference numeral 1 is a rotary capper for attaching a cap to the upper end opening of a container 2. The capper 1 includes a rotating body 3 that rotates clockwise, and a rotary table 4 that rotates by placing the container 2 on the lower side of the rotating body 3 is provided. At the upper position of each container 2 placed on the turntable 4, a capping head 6 for mounting a cap 5 on the upper end opening of the container 2 is provided. Each capping head 6 is configured to be raised and lowered while being integrally rotated with the rotary table 4, and is also rotated in one direction in conjunction with a servo motor 7 as a drive source. Each servo motor 7
Is controlled by a control device (not shown), and the control device drives each servo motor 7 when each capping head 6 moves within a predetermined rotation range as the rotary table 4 rotates. By doing so, each capping head 6 is rotated. When the containers 2 filled with the filling liquid are transported to the position of the capper 1 by the transport conveyor 8, the respective containers 2 are
Are sequentially supplied onto the rotary table 4 by the supply star wheel 9. After that, the caps 5 are attached to the containers 2 supplied onto the rotary table 4 by raising and lowering the capping heads 6 and rotating the capping heads 6 by the servo motors 7 as the rotary table 4 rotates. The containers 2 whose caps 5 have been attached in accordance with the rotation of the rotary table 4 in this manner are then sequentially discharged from the rotary table 4 onto the transport conveyor 5 by the discharge star wheel 10. There is. Therefore, the capper 1 includes the torque detection device 12 between the capping head 6 and the servo motor 7, and when the servo motor 7 is driven,
The cap 5 is attached to the container 2 as described above via the torque detection device 12, and at the same time, the capping torque by the capping head 6 can be detected. Figure 3
Further, as shown in an enlarged manner in FIG. 4, the torque detection device 12 of the present embodiment uses a planetary gear mechanism, and the sun gear 13 connected to the drive shaft 7a of the servomotor 7 is used.
And three planetary gears 14 that mesh with the sun gear 13.
And an internal gear 15 that surrounds and meshes with these three planetary gears 14. The shaft portion of each planetary gear 14 is provided with an engaging shaft 14a projecting downward.
The engagement shaft 14a is fitted in a through hole 16a formed in a disc-shaped plate 16. A connecting shaft 16b is projectingly provided on the shaft portion of the plate 16, and the connecting shaft 16b is connected to the capping head 6 on the lower side. Further, a protrusion 15a is formed on the outer peripheral portion of the internal gear 15 so as to protrude outward in the radial direction. Then, at the same time as connecting one end of the load cell 17 as a detecting means to the projecting portion 15a, the other end of the load cell 17 is connected to the bracket 18 on the side of the rotating body 3 to which the servo motor 7 is fixed. Therefore, the internal gear 15 has the load cell 17
It is in a state of being fixed to the rotating body 3 via. The load cell 17 is adapted to detect the rotational force acting on the internal gear 15, and the detection value detected by the load cell 17 is transmitted to the above-mentioned control device. As described above, in this embodiment, the planetary gear mechanism including the sun gear 13, the planetary gear 14, and the internal gear 15, the plate 16 and the load cell 17 constitute the torque detection device 12.
In the above configuration, the cap 5 by the capper 1
When performing the mounting work of (1), first, a predetermined capping torque for mounting the cap 5 on the container 2 is input to the above-described control device in advance. Thereafter, as the rotary table 4 rotates, the control device drives each servo motor 7 to rotate each capping head 6, so that the cap 5 is attached to the upper end of the container 2. More specifically, when the servomotor 7 is driven by the control device, the sun gear 13 is rotated clockwise in conjunction with the drive shaft 7a thereof. Then, each planetary gear 14 rotates counterclockwise and revolves clockwise around the sun gear 13.
Therefore, since the plate 16 is rotated clockwise, the capping head 6 interlocked with the plate 16 is rotated clockwise and the cap 5 is attached to the upper end opening of the container 2. Then, as shown in FIG. 4, when the attachment of the cap 5 is completed, a counterclockwise rotational force acts on the internal gear 15, and the rotational force is detected by the load cell 17, and the control device is operated. Be transmitted to. After that, the control device drives each servo motor 7 so that the rotational force transmitted from the load cell 17 and acting on the internal gear 15, that is, the capping torque by the capping head 6 becomes a predetermined capping torque input in advance. To control. Therefore, the capping head 6 can attach the cap 5 to the container 2 with a predetermined capping torque input in advance. As described above, the torque detection device 12 according to the present embodiment uses the planetary gear mechanism instead of the conventional flexible ring and the engagement pin as its constituent members, so that the capping head 6 is closed even if it is repeatedly used. The torque detection accuracy does not decrease. Also, the capping head 6
Even if the servo motor 7 which is the drive source of the above-mentioned changes with time and variations occur between the voltage and the torque of the drive shaft 7a, the capping head 6 causes the capping head 6 to close the capping torque by the torque detecting device 12 and the control device. Can be kept constant. In addition, although the above-mentioned embodiment explained the case where the present invention was applied to the torque detecting device 12 of the capper, it is needless to say that the present invention can be applied to the torque detecting device 12 of the decapper which removes the cap from the container.

As described above, according to the present invention, it is possible to obtain an effect that it is possible to prevent a decrease in torque detection accuracy.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an exploded perspective view of a main part of FIG.

FIG. 4 is an enlarged view of a main part along line IV-IV in FIG.

[Explanation of symbols]

1 Capper (Container Processing Device) 2 Container 5 Cap 6 Capping Head (Processing Head) 7 Servo Motor 12 Torque Detector 13 Sun Gear 14 Planetary Gear 15 Internal Gear 17 Load Cell (Detector)

Claims (2)

[Claims] 1. A container processing apparatus comprising a processing head for mounting a cap on a container in association with a motor as a drive source, and a torque detection device for detecting a capping torque of the processing head when mounting the cap on the container, The torque detection device, a sun gear that interlocks with the drive shaft of the motor, a planetary gear that meshes with the sun gear and that interlocks with the processing head, an internal gear that meshes with the planetary gear, and the internal teeth. A torque detection device for a container processing apparatus, comprising: a detection means that is provided over a gear and a frame to which the motor is fixed and that detects a rotational force that acts on an internal gear. 2. A container processing apparatus comprising a processing head for removing a cap from a container in association with a motor as a drive source, and a torque detection device for detecting a capping torque of the processing head when the cap is removed from the container. A sun gear that interlocks with the drive shaft of the motor; a planet gear that meshes with the sun gear and interlocks with the processing head; an internal gear that meshes with the planet gear; A torque detection device for a container processing device, comprising: a detection device that is provided across a tooth gear and a frame to which the motor is fixed and that detects a rotational force that acts on an internal gear.