JPS6161335B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting the unscrewing force of a cap screwed onto a container. More specifically, the maximum torque required to unscrew a cap screwed into a container such as a glass bottle and the temporal changes in torque associated with unscrewing are detected by electrical means to determine whether the tightening force of the cap is appropriate. The present invention relates to a cap screw opening force detection device for determining cap screw opening force.

In the present invention, the cap refers to a screw cap made of metal or plastic, a pilfer-proof cap, etc.
Pilfer-proof cap, twist-off
It has a concavo-convex portion that engages with the concavo-convex portion of the container mouth such as a twist-off cap, flute cap, etc., and can be disengaged by rotation and removed from the container mouth. Refers to caps.
Rotating the cap in the direction in which the cap engages with the container mouth is called screw tightening, and rotating the cap in the opposite direction is called screw opening.

If such a cap is not tightened to a sufficient degree, the seal may be incomplete and the contents may deteriorate due to the intrusion of outside air, or the contents may leak. It may be difficult to open. Therefore, in the screw tightening process, it is necessary to measure the screw opening force and manage the screw tightening operation so that this value falls within an appropriate range. Therefore, there is a need for a highly accurate and simple method and device for measuring cap screw opening force. As a conventional measuring device,
A container with a screw-tight cap is fixed to a mounting base, and a spring is provided between the mounting base and the base to restrict the rotation of the mounting base. The cap is rotated by hand to measure the screw-opening force, and the screw-opening force is read by visually observing the movement of the pointer which is proportional to the amount of displacement of the spring.

Therefore, depending on whether the measurer is a strong adult male, or a weak female or child, there will be differences in the measured values because the screw opening speed etc. will be different, and even if the same person measures, the results may not be continuous. As the number of measurements increases, the measured values may change due to fatigue or the like. Also, the maximum torque for screw opening force is specified in 10 below.
As shown in the figure, it appears instantaneously, so it is impossible to read the most accurate value by visual measurement, and there are large individual differences. Furthermore, as illustrated in Fig. 10, in a cap with a complicated structure such as a pilfer-proof cap, the torque fluctuates significantly in a very short period of time as the screw is opened, and by the time the screw is finished unscrewing. Several peaks occur. The combination of these peaks determines the difficulty of screw-opening, but it is impossible to measure these peak values with conventional spring-type devices. Therefore,
It is also possible to analyze the unscrewing force-time curve as shown in Figure 10 and develop a cap that is easier to unscrew (e.g. by changing the type of sealing compound, thickness, knurling depth, etc.). It is possible. In addition, even in the case of a simple screw cap, the time from when you try to open the screw to when it reaches the maximum torque is a major factor that determines the difficulty of opening the screw, along with the maximum torque. cannot be measured.

On the other hand, Japanese Utility Model Application Publication No. 49-132877 discloses a spring rod that brakes the rotation of a rotary plate that holds a container, a strain gauge that is attached to a threaded rod, and a torque that is electrically connected to the strain gauge. An opening torque measuring device including a recording instruction device is disclosed. In the case of such a strain gauge type device, it is possible to create and analyze a screw opening force-time curve.

However, the cap chuck mechanism of the torque measuring device disclosed in the above publication consists of a rubber cylinder surrounding the cap and a pawl ring circumscribing the rubber cylinder, and the pawl ring connects three arc-shaped divided pieces with a spring. It has a simple structure. In this type of chuck mechanism, excessive clamping force is applied to the side wall of the cap by the spring and rubber tube to prevent slipping during opening. Excessive tightening force deforms the cap side wall and creates an abnormal frictional force between the container mouth and the inner surface of the cap side wall, making it difficult to accurately detect the cap screw opening force. This problem is especially serious when the cap is made of a thin and easily deformable aluminum plate.

The present invention aims to solve the problems of the prior art as described above. That is, an object of the present invention is to provide a device for detecting the unscrewing force of a cap screwed to a container, which is accurate and highly stable without individual differences.

Another object of the present invention is to enable quantitative evaluation of the true degree of difficulty in unscrewing by measuring temporal changes in the unscrewing force of a cap screwed onto a container. The object of the present invention is to provide a detection device for.

Still another object of the present invention is to provide a device for detecting the screw-opening force of a cap screwed onto a container, which is capable of automatically determining the screw-opening force.

According to the present invention, a mount for fixing a container to the mount and for fixing a container having a screw-tightened cap;
A cap screw opening device that grips the side body of the cap and rotates the cap in the screw opening direction, and cooperates with a base to stop the rotation of the mounting base as the cap rotates. A method for controlling the unscrewing force of a cap screwed into a container, comprising a restraining member fixed to the mount or base, and a means for electrically detecting the amount of elastic strain generated in the restraining member when the cap is rotated. The cap screw-unscrewing device includes a gripping tool for gripping the side body of the cap, and a guide surface that engages with the gripping tool and guides the gripping tool toward the cap. A guide member, a support body that rotatably supports the guide member around a cap axis, and the guide member rotates until the gripper moves in the direction of the cap and grips the cap. a locking mechanism that locks the
A rotating body that rotates about the axial direction of the cap or a direction parallel to the cap and engages with the gripping tool, and a drive mechanism that rotates the rotating body and the guide member, the rotating body and the gripping member. The mutually engaging portions of the tools are configured such that the gripping tool moves toward the cap by rotation of the rotating body only while the guide member is locked, and when the cap is stationary. After the cap starts rotating together with the gripping tool and the guide member by moving the gripping tool toward the cap and gripping the cap when the cap is
There is provided a cap screw opening force detecting device characterized in that the gripping tool stops moving toward the cap.

The present invention will be explained below with reference to the drawings.

FIG. 1 shows an apparatus that is an embodiment of the invention.
A container 2 to which a cap 1 is screwed is fixed to a mounting base 3 by two pairs of fixtures 4 facing each other.
As shown in FIGS. 2-a and 2-b, the fixture 4 includes a gripping tool 4a, a sliding member 4b, and a fixing member 4c.
The gripping tool 4a is attached to the tip of the sliding member 4b,
It is rotatably attached via a spring 4d.
The sliding member 4b is a fixed member 4 fixed to the mounting base 3.
c Slide in the hollow part inside. And always spring 4
When the container is to be fixed, it moves to the left in the figure and presses and fixes the container via the gripper 4a by the action of the spring 4e.
The gripping tool 4a is bifurcated, and it is preferable that at least the tip portion that comes into contact with the container is covered with hard elastic rubber having a large coefficient of friction. This is to prevent slippage between the container and the gripper when attempting to rotate the cap. The gripping tool 4a is normally located at the position shown by the solid line in the figure due to the action of the spring 4d, but when the container 2 is fixed, it rotates to the position shown by the chain line in the figure. With this fixture 4, the container 2 can be fixed to the mounting base 3 with one touch.

The support member 5a of the cap screw opening device 5 is adapted to be moved up and down via a rack 7a along a support 7 fixed on a base 8 by rotating a handle 6, thereby fixing the container 2. In the present case, the cap screw opening device 5 is located at the upper level. Note that the support member 5a is configured so as not to rotate about the support column 7. As shown in FIGS. 3 and 4, a rotating shaft 9 coaxial with the central axis of the fixed container is fixed to the lower part of the mounting base.
The rotation shaft 9 is rotatably supported on a pedestal 10 fixed on the base 8 by ball bearings 10b and 10c. A long plate-shaped restraining member 10a protrudes in one direction from the pedestal 10, and its tip end is connected to two screws screwed onto both sides of a protruding piece 11 having a U-shaped cross section and fixed to the lower part of the mounting base 3. is loosely inserted between the pointed ends of the screws 12. Strain gauges 13 are attached to opposite sides near the base of the restraining member 10a, and their input and output lines are connected to a terminal box 14.
is connected to. A DC power supply for input is housed inside the terminal box. The terminal 14a of the terminal box is connected to an indicator (not shown), a recorder, or a circuit for determining the appropriateness of the screw opening force. In this way, the rotation of the container 2 as the cap is screwed open is restrained by the restraining member 10a, and the amount of elastic strain produced in the restraining member at this time is electrically detected using the strain gauge 13. This amount of strain is proportional to the torque required to unscrew the cap.

FIG. 5 shows details of the cap screw opening device. In the cap screw opening device, the force of the gripping tool 51 pressing against the side wall of the cap is such that the frictional force between the gripping tool 51 and the side wall of the cap can overcome at least the maximum torque required to rotate the cap. It is desirable that the cap be large enough not to deform the side wall of the cap. That is, after the cap starts rotating due to the frictional force, it is desirable that the pressing force does not increase any further. This is because deforming the cap side wall by pressing creates an abnormal frictional force between the outer surface of the container and the inner surface of the cap side wall, making it impossible to detect a normal cap screw opening force. The apparatus shown in FIG. 5 is constructed to satisfy the above requirements.

The structure of the cap screw opening device will be explained below with reference to FIGS. 5, 6, 7, and 8.

A plurality of grippers 51 (three in this figure) are provided symmetrically about an extension of the center line of the container to be fixed, and each gripper is attached to the side of the corresponding sliding piece 52 near the center by a nut 53. It is fixed. By loosening the nut 53, the gripping tools 51 can be moved horizontally on the sliding piece 52, and the distance between the gripping tools 51 can be adjusted appropriately according to the diameter of the cap. . Grasp tool 51
It is preferable that at least the surface of the tip of the cap 1 that comes into contact with the cap 1 is covered with an elastic material having a large coefficient of friction (for example, rubber), and that the contact area is as large as possible. This is to prevent slippage during screw drilling. That is, when a slip occurs, the gripping tool 51 moves toward the cap until the slip disappears.
Therefore, if slipping is likely to occur, the cap will deform, creating an undesirable frictional force between the inner surface of the cap and the outer surface of the container (which does not occur when trying to open it by hand), and making it difficult to measure the correct screw-opening torque. This is because there is a risk that it will not be possible.

The sliding piece 52 has a sliding surface 55 cut in the radial direction on a circular guide plate 55 fixed to the bottom of the central shaft 54.
It is attached so that it can slide along a. Sliding piece 5
2 engages with the eccentric cam 56 through a cam groove 52a provided on the outer upper part of the eccentric cam 56.
6 can perform one reciprocating linear motion. That is, when the guide plate 55 is in a fixed state, the sliding piece 52 and hence the gripping tool 51 approach the central axis direction, that is, the direction of the cap 1, as the eccentric cam 56 rotates, and after coming closest, they rotate further. If you continue or rotate in the opposite direction, cap 1
move away from

The eccentric cam 56 is rotated by an electric motor 57 with a reduction gear via gears 58, 59, 60, and 61.

The gears 59 and 60 are connected to a sleeve 64 which is rotatably mounted by a roller bearing 63 inside an inner cylinder 62 fixed to the tip of the arm of the support member 5a.
is fixed to the bottom of the. The center shaft 54 is rotatable within the sleeve 64 via a bushing 65. A circular support plate 6 is attached to the upper end of the central shaft 54.
6 is fixed, and the peripheral edge of the support plate 66 is a needle.
It is supported by a thrust bearing 67 to prevent the center shaft 54 from falling, and to minimize the resistance when the center shaft 54 rotates together with the sleeve 64 (at least the sliding resistance between the center shaft 54 and the bushing 65). dynamic resistance).

Below the support plate 66 is a donut-shaped electromagnet 68.
is fixed to the upper surface of the inner cylinder 62, and a friction plate 66a is attached to the support plate 66 via a ring-shaped leaf spring 66b, facing the upper surface of the electromagnet 68. When the electromagnet 68 is energized, the friction plate 66a is attracted to the electromagnet 68, so that rotation of the central shaft 54 is braked. When the electromagnet 68 is deenergized, the leaf spring 6
6b causes the friction plate 66a to rise and come out of contact with the electromagnet 68, so that it can rotate freely. FIG. 9 shows a control circuit for the electromagnet 68. Electromagnetic coil 71 contacts variable voltage DC power supply 72
Connected in series with _R1 . A relay R for driving contacts R ₁ and R ₂ is connected to a power source 73 in series with a contact R ₂ and a proximity switch contact 74, and a one-way push button switch S is connected in parallel with the contact R ₂ . The proximity switch 69 (FIG. 5) is connected to the central shaft 54.
When facing the protrusion 54a provided at the upper end, the contact 74 is closed, and when the facing is removed by a very slight rotation of the central shaft 54, the contact 74 is closed.
is configured to be open. Before measurement, the protrusion 54a and the proximity switch 69 are adjusted so as to face each other.

When the push button switch S is turned on at the same time as or before starting the electric motor 57, the relay R is energized, the contact _R2 is turned on, and it is self-held.
Contact _R1 also turns ON. Therefore, the electromagnetic coil 7
1, a predetermined current flows through the center shaft 54 by adjusting the voltage of the power source 72, and a constant braking force is applied to the center shaft 54. This braking force is caused by the gripping tool 51
The gripping tool 51 should be large enough to press against the cap side wall to the extent that no slipping occurs between the cap side wall and the cap side wall, while the value should be lower than the initial peak value of the screw-opening force. This appropriate braking force is determined in advance through experiments for containers and caps of the same type. If the frictional force between the gripper 51 and the side wall of the cap is made sufficiently large, this braking force may be of a relatively small value. Next, when the screw opening force reaches its first peak value and the cap begins to rotate, the contact point 74 of the proximity switch turns OFF.
Relay R is deenergized, contact _R1 is also turned OFF, and electromagnetic coil 71, ie, electromagnet 68, is deenergized. Therefore, for the measured value of the screw opening force, the electromagnet 6
8 braking force is not affected.

The operation of the above device will be explained below.

First, turn the handle 6 to raise the cap screw opening device 5, and then insert the container between the fixtures with one touch. Fix it. Next, handle 6
is rotated in the opposite direction to lower the cap screw opening device 5 until the gripping tool 51 reaches the position of the cap 1. Next, switch S for electromagnet 68 input.
After turning on, turn on the input switch of electric motor 57.
Make it. The rotation of the electric motor 57 is controlled by gears 58, 59, 6.
It is transmitted to the eccentric cam 56 via 0 and 61. During this time, the friction plate 66a is attracted by the electromagnet 68, and due to the frictional resistance between the electromagnet 68 and the friction plate 66a, the central shaft 54 and the guide plate do not rotate and are held stationary under a constant braking force. has been
Therefore, as the eccentric cam 56 rotates, the gripper 51 moves on the sliding surface 55a of the guide plate 55 toward the cap 1. Meanwhile, the sleeve 64 is bushing 65
Rotates around the central axis via. Once the three gripping tools 51 grip the side wall of the cap 1, it becomes difficult to move it any further. Therefore, the gear 61 stops rotating, so that the guide plate 55 and the central shaft 54 are aligned with the cap 1.
It starts rotating. In other words, screw opening begins. At this time, even if a slip occurs between the grip 51 and the cap 1, the gear 61 rotates slightly and the grip 51 presses against the side wall of the cap 1 until no slip occurs, and from then on, the gear 61 rotates. The movement stops. When the first peak value of the screw opening force is reached,
At the same time, the central shaft 54 starts rotating and the proximity switch 69
Due to this action, the electromagnet 68 is deenergized, the braking force disappears, and a correct measurement value can be obtained.

However, if the frictional resistance between the electromagnet 68 and the friction plate 66a is negligible with respect to the maximum screw-opening torque, the electromagnet 68 does not necessarily need to be deenergized. When the gripping tool 51 firmly grips the cap 1 and tries to rotate it, the container also tries to rotate, and the force is transmitted through the fixture 4, the mounting base 3, the protruding piece 11, and the screw 12 to the tip of the stopper member 10a. , and a bending moment acts on the restraining member 10a. Elastic strain based on the bending moment is electrically detected by a strain gauge 13, and its signal is outputted via a terminal box 14 to an indicator, a recorder, or a pass/fail determining circuit.

Figure 10 shows the pilfer-proof cap (diameter
An example of measuring the opening force of a screw (28mm, height 18mm, thickness 0.23mm, made of aluminum) is shown. As shown in FIG. 11, the pilfer-proof cap consists of a knurled portion 1a, a threaded portion 1b, a bridge portion 1c, and a bottom portion 1 from the top.
d, and the bridge portion 1c consists of a plurality of strip portions bridging the threaded portion 1b and the bottom portion 1d, and a slit portion therebetween. A vertical score line 1e is engraved at one location on the bottom 1d. In FIG. 10, a indicates the torque corresponding to the braking force by the electromagnet 68, and a indicates the torque when the threaded portion 1b starts to slip, that is, the screw opening force. The plurality of peaks seen between -1 and -n indicate the torque required to cut each of the strips of the bridge portion 1c. Alternatively, the vertically scored line 1e indicates the torque at which it breaks.

As described above, according to the present invention, since the screw opening force is detected electrically, it is possible to record temporal changes in the torque required for screw opening, but the conventional mechanical spring detection method cannot Such a record is impossible.

Next, one embodiment of the pass/fail discriminating circuit will be described with reference to FIG. 12 in the case of a pilfer-proof cap. In this case, the quality of each of the peak in FIG. 10, the maximum peak (that is, the maximum resistance force of the bridge) among the small peaks -1, .

First, the detection signal 101 is converted into a digital signal by the A/D converter 102. All of these digital signals are stored in main memory 103. Next, in order to find the peak in the data stored in the main memory 103, the peak detection circuit 104 has two
Prepare two registers, put the data at address 1 and the data at address 2 into each register, compare the two, detect the difference, and store it. Next, numbers 2 and 3
The addresses are compared and the difference is detected and stored. Thereafter, this operation is repeated in the same way, and an address where the sign of the difference changes (for example, from positive to negative) is detected, and this peak value is stored in address 1 of the sub-memory 105 (corresponding to the peak). Thereafter, peaks are found for all data in the same manner and stored in the submemory. The determination as to whether all data has been detected is based on the fact that the torque becomes 0 when the cap is completely opened. In other words, it is determined that the process has ended when it is detected that the data has fallen below a certain level.
Next, the first peak value (peak in Figure 10)
is sent to the display device 106a and the quality determining circuit 107a. In the display device 106a, the peak value is appropriately converted and digitally displayed on the display element. In the pass/fail judgment circuit 107a, the upper limit of the peak value
U ₁ and lower limit L ₁ are set in advance, and it is determined whether the measured peak value is within the range. That is, an upper limit value U ₁ and a lower limit value L ₁ are stored in a register, the difference from the measured peak value is calculated, and when either the upper limit or the lower limit indicates an abnormality, the defect display circuit 109 is activated. If the purpose of the defect display circuit 109 is only to indicate an abnormality, it is sufficient to simply turn on a lamp.

If the first measured peak value is normal, proceed to the next process.

A plurality of small peak values based on the bridge are stored in addresses 2 to (n-1) of the submemory 105, and two registers are provided in the maximum value detection circuit 108 to select the highest value among them. 2
The values from address to address (n-1) are sequentially compared to find the maximum value. After this maximum value is determined, display and defect determination are performed by following the above-mentioned procedure. n
The address peak (corresponding to that in FIG. 10) is also processed in the same way as for address 1.

In the case of a normal screw cap, the above-mentioned display and quality determination are performed only for the first peak value.

Examples of devices having the same function as the cap screw opening device shown in FIG. 5 are shown in FIGS. 13, 14, and 1.
5 and 16.

The three gripping tools 81 arranged at an angle of 120 degrees to each other move along the sliding surface 82a provided at the lower part of the circular guide plate 82 at an angle of 120 degrees to each other.
It is capable of sliding in the radial direction of 2. Elastic rubber 81a is attached to the tip of each gripper 81 to prevent slipping on the cap 1. Further, on the upper surface of each gripping tool 81, a plurality of protrusions 81b are provided that are parallel to the circumferential direction of the guide plate 82a, and the protrusions 81b are arranged in a spiral groove 83a provided on the lower surface of the drive plate 83. engage with. The drive plate 83 is fixed to a gear 84, and can slide along the outer circumferential surface 82b of the guide plate 82 at the same time as the gear 84 is rotated by a drive mechanism (an electric motor with a reduction gear) not shown. On the other hand, the guide disk 82 is fixed to the central shaft 85, and the upper flange 85a of the central shaft 85 is supported by a support body 86. The support body 86 is connected to a support member (5a in FIG. 1), which is not shown. The flange 85a has a vertical groove 85 having an opening.
b is bored, a coil spring 85c is installed inside it, a steel ball 85d is installed in the lower opening, and the steel ball 85d
is engaged with an annular groove 86a provided at the top of the bottom of the support. The annular groove 86a is blocked at one point by a thin blocking wall 86b.
When the shielding wall 86b and the steel ball 85d collide, a braking force is applied to prevent the center shaft 85 from freely rotating, and when a torque of a certain amount or more is applied to the center shaft, the steel ball 85d is moved by the coil spring 85c. Overcoming the resistance, it rises and crosses the blocking wall 86b, and then the central axis 8
5 is constructed so that the resistance to rotation disappears.

The operation of the above device is as follows.

The gear 84 is rotated by the drive mechanism, and at the same time, the drive plate 83 is rotated. At that time, the central axis 85
The steel ball 85d is engaged with the blocking wall 86b and the first
Since it is prevented from rotating in the direction of the arrow in FIG. 5, it is in a stationary state, and accordingly, the guide plate 82 is also stationary. Therefore, a force toward the center due to the rotation of the screw groove 83a is applied to the protrusion 81b on the upper part of the gripping tool 81, so that the protrusion 81 moves toward the cap 1 along the sliding surface 82a. . And the tip 8 of the protrusion 71
1a grips the side wall of the cap 1 and presses the tip 81.
The frictional force between the side wall of the cap 1 and the shielding wall 8
When the locking force between the steel ball 6b and the steel ball 85d becomes larger, the steel ball 85d becomes able to overcome the blocking wall 86b, and after reaching the maximum torque for opening the cap screw, the cap 1 rotates together with the gripping tool 81. can be unscrewed. Spiral groove 83a and protrusion 81
By reducing the frictional resistance between b and the sliding surface 82, that is, by using a material with low frictional resistance such as Teflon for these sliding surfaces, and by improving the finishing accuracy, Blocking wall 86
Even if the resistance b, that is, the braking force, is made considerably small, it is possible to slide the gripping tool 81 toward the cap 1 while keeping the guide plate 32 stationary. Therefore, by doing so, it is possible to eliminate the influence of the blocking wall 86b on the measured torque value of the braking force. The braking force can be adjusted by moving the screw 85e up and down.

By employing a cap screw opening device based on the principle shown in the above two embodiments, the force with which the gripping tool presses the cap in the radial direction during screw opening can be kept to the necessary minimum value. Therefore, even if a cap is made of thin (for example 0.23 mm) and easily deformable material, such as a pilfer-proof cap made of aluminum, it will be deformed in the radial direction by the gripping tool, and friction due to this deformation will occur. Resistance does not affect the measured torque value. Therefore, it is possible to measure the screw opening force with high accuracy.

However, the present invention is not limited to the above-mentioned embodiments. For example, the amount of elastic strain of the restraining member 10a can be detected using a potentiometer method, a capacitance method, a differential transformer method, an eddy current method, or other known minute displacement detection methods. It may also be detected by a method.

Further, in addition to the embodiment shown in FIG. 1, the form of the restraining member may be as shown in FIGS. 17-a to 17-c, for example.

FIG. 17-a shows a method in which the twisting of the restraining member 10a caused by the rotation of the mounting base 3 is detected using a strain gauge 13 attached to the surface of the restraining member. The restraining member 10a is fixed to the mounting base 3 and the base 8. Fig. 17-b shows a structure between the shaft 9a fixed to the mounting base 3 and the shaft 9b fixed to the base 8, for example.
This is a method of detecting torque by inserting a strain gauge type converter 10c (which also functions as a restraining member) as described in Japanese Patent No. 35073. In Fig. 17-c, two photocouplers 13a and 13b are provided in place of the strain gauge 13 in Fig. 17-a, the light emitting part is fixed to the restraining member 10b, and the light receiving part is fixed to the base. This is intended to detect the difference in the amount of light received by the two light emitting sections, that is, the difference in current (or voltage) due to the twisting of the restraining member 10b. It goes without saying that any known electrical detection method for torsional displacement other than the above may be employed.

The cap screw-opening force detection device of the present invention has the effect that, since the gripping tool does not unnecessarily press the cap and cause it to deform, there is no risk of detecting an abnormally high screw-opening force accompanying deformation. play. Furthermore, since the detection is performed electrically, it is possible to automatically determine whether the cap screw opening force is within an appropriate range. In addition, it is possible to record temporal changes in screw opening torque.
Even in cases where several peaks occur, such as in a pilfer-proof cap, by analyzing the curve, the true level of difficulty in opening a screw can be evaluated, and this can be used as feedback for the development of a cap that is easier to unscrew. It also has the effect that it is possible to determine the degree of difficulty in opening a screw based on the time it takes to reach the maximum torque.

[Brief explanation of the drawing]

FIG. 1 is a front view of an apparatus that is an embodiment of the present invention, and FIGS. 2-a and 2-b are a partially sectional front view and a plan view, respectively, of the container fixture used in FIG. 1. Figure 3 is a sectional view taken along the - line in Figure 1.
Figure 4 is a sectional view taken along the - line in Figure 1, and
The figure shows a partially sectional front view of the cap screw opening device used in the device shown in FIG. 1, FIG. 6 shows a bottom view of the device shown in FIG. 5, and FIG. , FIG. 8 is a sectional view taken along the - line in FIG. 5, FIG. 9 is an electromagnet control circuit, FIG. 10 is an example of recording the cap screw opening torque by the device of the present invention, and FIG. 11 is a pill Fig. 12 shows an embodiment of a digital circuit for determining whether the cap screw opening force is good or bad using the device of the present invention, and Fig. 13 shows the cap used in the device of the present invention. FIG. 14 is a sectional view taken along line XII-XII in FIG. 15, and FIG. 15 is a bottom view of another embodiment of the screw opening device.
Figure 16 is a cross-sectional view taken along the line - - of Figure 13.
The cross-sectional views along the lines are 17-a, 17-b,
Figure 17-c each shows an example of a restraining member used in the device of the present invention. 1...Cap, 2...Container, 3...Mounting stand,
4...Mounting tool, 5...Cap screw opening device, 8
... Base, 10a, 10b, 10c ... Stopping member, 13 ... Strain gauge (means for electrically detecting elastic strain), 51 ... Grip (grip), 54 ... Central shaft (supporting body) , 55... guide plate (guide member), 5
2...Sliding piece (grip), 52a...Cam groove, 5
5a...Sliding surface (guide surface), 56...Cam (rotating body), 57...Electric motor with reducer (drive mechanism including DC motor), 58, 59, 60, 61... Drive mechanism, 66a ...Friction plate (locking mechanism), 68...
...Electromagnet (locking mechanism), 81...Gripper (grip), 82...Guide plate (guide member), 82a...Sliding surface (guide surface), 83...Driving plate (rotating body), 83
a... Spiral groove (the part where the rotating body and the gripping tool engage with each other), 84... Gear (drive mechanism), 85... Center shaft (support body), 85d... Steel ball (locking mechanism) , 86
b...Blocking wall (locking mechanism).

Claims (1)

[Claims] 1. A mounting base for fixing a container to which a cap is screwed, a cap screw opening device that grips the side wall of the cap and rotates the cap in the direction of unscrewing, and a mounting base that accompanies the rotation of the cap. A stopping member fixed to the mounting base or the base in order to stop the rotation of the cap in cooperation with the base, and means for electrically detecting the amount of elastic strain that occurs in the stopping member as the cap rotates. A device for detecting the force for unscrewing a cap screwed onto a container having a guide member having a guide surface that guides the gripping tool toward the cap; a support that rotatably supports the guide member around the cap shaft; A locking mechanism that locks the guide member so that it does not rotate until the cap is gripped, and a locking mechanism that rotates around the axial direction of the cap or a direction parallel to this and engages with the gripping tool. A movable body, a drive mechanism that rotates the rotary body and the guide member, and the portions of the rotary body and the gripping tool that engage with each other prevent the rotation of the rotary body only while the guide member is locked. The gripping tool is configured to move toward the cap when the cap is at rest, and when the cap is at rest, the gripping tool moves toward the cap and grips the cap, thereby causing the cap to move toward the cap. A device for detecting a force for opening a screw in a cap, characterized in that the gripping tool stops moving in the direction of the cap after it starts rotating together with the tool and the guide member.