JPS60247111A - Apparatus for measuring depth of groove in seamed part of can - Google Patents

Abstract

PURPOSE:To measure the depth of the seamed part of a can to be measured accurately, by fixing a linear electronic micrometer to a moving body which is supported so that it is moved freely. CONSTITUTION:The lower end of a can to be measured 10 is fixed to a clamping table 40. An air cylinder 75 is moved downward by an instruction from a control part. A moving body 71 is moved downward against the tension of a spring 76. A linear electronic micrometer 20 is also moved downward, and a spindle 23 is contacted with the upper surface of the lid of the can 10. An L shaped lever 22 is contacted with the apex of the seamed part of the can 10. Then an air cylinder 65 is moved leftward, and a moving body 61 is moved leftward against a spring 66. The moving body 71 and the micrometer 20 are also moved leftward as a unitary body. The L shaped lever 22 and the tip of the spindle 23 are moved leftward on the diameter of the lid of the can 10. The tip of the spindle 23 reaches the deepest part of a groove S. The pulse output of the micrometer 20 at this time is compared with the adequate preset value of the depth of the groove by a peak hold circuit 90. The series of inspection is automatically performed along the entire circumference of the can 10, and the quality of the seaming state of the can is inspected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for automatically measuring the depth of a groove formed on the inner periphery of a seamed portion of a seamed can lid.

Fig. 1.2 is a diagram showing the process of seaming performed by the first seaming roll processing and the second seaming roll processing in the double seaming machine, and a cross section of the seaming part of the product. As shown in Figure 1, the curled portion 2' of the can lid 2 is bent under the flange 1' of the can body 1 by the first crimping roll, and then each of the curled parts 2' is bent under the flange 1' of the can body 1 by the second crimping roll as shown in Figure 2. The space between them is strongly crimped. In order to check whether the sealing state is good or not due to the seaming process, inspections are carried out from a number of viewpoints, one of which is the depth of the groove.

Through the above-mentioned crimping process, an annular groove S is formed on the inner periphery of the seaming part as shown in Fig. 2, and the cross section of this groove is a shallow dish-like shape that opens upward, and is usually called a countersink. There is. In order to consider the distance C (hereinafter referred to as depth) between the lowest part of this groove and the top of the seamed part, it is necessary to
If the wrapping is insufficient, C will be large, and if the wrapping is excessive, C will be small, and in either case, the seal will be incomplete. Therefore, the degree to which the depth of the annular groove of the product is larger or smaller than the normal value is inspected, and products that are larger or smaller than a certain amount are judged to be defective.

Conventionally, the above-mentioned inspection has been carried out manually, and various inspection instruments have been used. For example, a typical example is a linear electronic micrometer for measuring groove depth.

FIG. 3 shows an example of the linear electronic micrometer 20, in which a spindle 23 is supported in a housing 21 so as to be movable up and down, and an L7 rod 2 whose base is fixed to the bottom of the housing 21.
The through hole at the tip of the spindle 23 faces the tip of the spindle 23, and within the housing 21, the spindle 23 receives a pushing force from an extrusion spring so that its tip is always pushed out toward the L7 rod 22 with a predetermined force. The amount of movement of the spindle 23 through the through hole is converted into a pulse signal by an optical scale for generating moire edges and a charging converter provided inside the housing 21, and the pulse signal is introduced into a reversible counter provided outside. . The reversible counter performs reversible counting of pulse signals corresponding to the moving direction of the spindle 23, and the counted value is displayed on the display section.

The means for detecting the amount of movement of the spindle 23 is not limited to the above, but may be a combination of a magnetic scale and a magneto-electric transducer, or a combination of a rack and pinion mechanism, a slit disk, and a charging converter. There are various types of micrometers 20, and some micrometers 20 have a built-in reversible counter or the like.

The measurement of groove depth using this method can be broken down as follows.

The outer surface of the L7 rod 22 is brought into contact with the top surface of the seaming part, the L7 rod 22 is maintained horizontally, and the tip of the spindle 23 protruding from the L7 rod 22 is brought into contact with approximately the center of the groove S. In this state, read the displayed value on the display section, and then lift the L7 rod 22 slightly to change the location where the spindle 23 hits left and right, read the displayed value each time, and read the maximum displayed value.

After the second operation, the same operation as above is repeated for a different seaming portion of the can. However, since this type of inspection is performed manually, a decrease in inspection efficiency is inevitable.

Therefore, automation of inspection is desired, and the simplest mode for automating the above-mentioned manual operation is as follows.

First, it is necessary to lower the linear electronic micrometer 720, which is located directly above the seaming section, and make the L7 rod 22 reach the top surface of the seaming section. The linear electronic micrometer 20 may be fixed in a vertical position, and the movable body may be moved by air ringing.

By the way, in this case, the contact pressure must be kept as low as possible when the rod 22 is brought into contact with the top surface of the seaming part, but if air sealing alone is used to achieve sufficient contact, the contact pressure may become excessive. turn into. Therefore, in order to make contact and reduce the contact pressure, a simple solution is to use a spring.The spring is tensioned between the movable body and its support, and the spring stretches as the movable body moves. When the tension becomes large and the contact state is reached, the tension of the spring and the weight of the movable body and its accessories may be made approximately equal.

Next, it is necessary to move the linear electronic micrometer 20 that is in contact with the top surface of the seaming part laterally, and to do so, the supporting body of the moving body described above must be supported so as to be movable laterally, and the movement of the linear electronic micrometer 20 must be moved laterally. All you have to do is provide an air shilling for this purpose.

With the above-described simple automation device, it is possible to bring the linear micrometer 20 into contact with the top surface of the seaming portion, and to move the micrometer in the horizontal direction in this state.

However, there is a problem in considering horizontal movement.

Since the deepest part of the groove is to be measured, the tip of the spindle 23 is moved from a position slightly away from the deepest part (right side in Figure 2) through the deepest part to the opposite side (left side in Figure 2). However, after passing through the deepest part,
It becomes inconvenient when approaching the seaming part and reaching a position where the slope becomes steep. In other words, on a slope with a small slope after passing the deepest part, the tip of the spindle moves while ascending, but
It is impossible to climb up a steep slope, and the lateral movement forces can result in bending of the spindle or damage to the seaming section.

The present invention is an attempt to solve the above-mentioned problem, and is designed to minimize the force required to move a linear electronic micrometer in the lateral direction, thereby preventing the micrometer from malfunctioning during measurement. be.

In the present invention, the driving means of the rod-shaped body is engaged in only one direction with respect to the moving body in the lateral direction, and the rod-shaped body is driven in the forward and reverse directions in the moving direction of the moving body. , the movable body is moved in one direction by engagement between the rod-shaped body and the movable body, and when driving in the opposite direction, the above-mentioned locking is released, and a spring is installed between the movable body and its support body. are provided so as to produce elasticity in the opposite direction, and the movement of the movable body in the opposite direction is caused only by the elasticity of the spring.

Embodiments of the present invention will be described below with reference to the drawings.

This embodiment is an example in which a cylinder and a piston are used as the driving means, and the piston shaft is a rod-shaped body.

In FIG. 4, a horizontal support 62 is fixed to the upper surface of a small pedestal 31 fixed on a table 30, and its sliding rail member 62' has a T-shaped cross section. A holding part on the lower surface of the first air cylinder 61 is movably held and supported, and a base of a first air cylinder 65 is fixed to a protruding member 63 that protrudes upward from the left end of the support 62, and the piston shaft and the above-mentioned movement The left end of the body 61 is engaged, and a tension spring 66 is tensioned between the protruding member 63 of the support body 62 and the movable body 61.

FIG. 5 is a front view showing the engagement relationship between the air cylinder 65 and the movable body 61, including a part of the piping system. The air cylinder 65 has left and right air chambers partitioned by an internal piston 65' with respective flow rate control valves 82°8.
3 to the flow path switching solenoid valves 81, and by switching the flow paths of the solenoid valves 81, the communication paths with the left and right air chambers are selectively opened to the atmosphere and the air source 80, respectively. , communicate. The figure shows a state in which the left air chamber is communicated with the air source 80 and the right air chamber is opened to the atmosphere, thereby moving the piston 65' to the right, and vice versa. In this case, contrary to the above, the left air chamber is communicated with the air source 80 by switching the electromagnetic valve 8 to open the left air chamber to the atmosphere. The shaft 68 of the piston 65' protrudes outward from the right wall of the air cylinder 65, and penetrates into the interior through a through hole in the left wall of the cylindrical body 61' whose base is fixed to the right side of the movable body 61. An engagement plate 69 is fixed to the right end of the piston shaft 68 inside the piston shaft 68 . Therefore, when the piston 65' moves to the right, the engagement plate 69 is pressed against the right base of the cylindrical body 61', and the two move to the right against the spring 66 in an integrated state.

On the other hand, if the piston 65' moves to the left, the cylinder 61' will be moved only by the tension of the spring 66 as follows. As the piston 65' moves, the engagement plate 69 moves to the left, and at the same time, the cylindrical body 61' moves to the left while being in contact with the engagement plate 69 due to the tension of the spring 66.

Here, when considering the tensile force of the spring 66, the movable body 61
It is clear that as the spring 66 moves to the left, the tensile force of the spring 66 decreases, and just before it moves to the left and stops, the tensile force becomes extremely small.

The tensile force can be adjusted to a desired level by selecting the spring 66 or adjusting the length of the tensioned spring.

In FIG. 4, the bottom of a fixing member 67 is fixed to the upper surface of the horizontal movable body 61, and a vertical support 72 is fixed to the right side of the fixing member 67. A holding portion on the left side of the upper and lower moving bodies 71 is movably engaged with and supported by the movable rail member 72, and a second air cylinder 75 is attached to a protrusion member 73 that protrudes rightward from the upper end of the support body 72. The base of the moving body 71 is fixed, the piston shaft thereof is coupled to the movable body 71, and the protruding member 73 and the movable body 71 are connected to each other.
A tension spring 76 is tensioned at the opening. A linear electronic micrometer 20 is fixed to the right side of the upper and lower movable body 71 with the L7 rod 22 facing downward.

The linear electronic micrometer 20 is as described with reference to FIG. be done.

The count value output terminal of the reversible counter 80 is connected to the input terminal of the peak hold circuit 90.
At 0, the maximum count value of the reversible counter 80 is held. The air cylinder 75 is in communication with the flow rate control valve and the flow path switching electromagnetic valve as described in FIG. Furthermore, a switching control command is given to each flow path switching electromagnetic valve from a valve control section (not shown) having an internal timer.

In the above process, the object to be measured 10 and the automatic measuring device are put into a measurement preparation state for measurement.

First, regarding the object to be measured, the clamp stand 40 on the stand 30
The lower end of the object to be measured 10 is fixed by a clamp mechanism 50 provided above.

Note that the lower portion of the clamp stand 40 is fixed to an indexing drive mechanism (not shown) provided within the stand 30.

Next, regarding the automatic measuring device, each air cylinder 65.
A switching command for full operation is given from the valve control unit to each of the flow path switching valves 75 (81 and others), and each air cylinder is in an operating state. That is, the piston of the first air cylinder 65 has moved to the right, the piston of the second air cylinder has moved upward, and the linear electronic micrometer 20 has moved away above the can 10.

Next, switching commands are sequentially sent to the valve control section. As a result, the second air cylinder 75 is activated downward, and as a result, the movable body 71 is moved downward against the tension of the spring 76, and the linear electronic micrometer is integrated with it. 20 also moves downward and its spindle 23 comes into contact with the top surface of the lid of the can 10, and then the 17 figure 7-2 comes into contact with the top surface of the seam of the can 10. In this state, the spring 76 is expanded and the tension increases, and this tension reduces the contact pressure of the L7 rod 22 against the top surface of the seaming portion.

Subsequently, after a predetermined period of time has elapsed, the first air cylinder 65 is activated to the left, and as a result, the spring 66 causes the I)
The first movable body 61 moves to the left, and the second movable body 71 and the linear electronic micrometer 20 also move to the left together with it. At this time, the tips of the L7 rod 22 and the spindle 23 of the linear electronic micrometer 20 do not contact the top surface of the seaming part of the can 10 and the inner surface of the groove S, respectively, and move outward, that is, to the left, on the diameter of the can lid. The tip of the spindle 23 reaches the deepest part of the groove S, passes it and ascends a small slope, and the movement is stopped when the drag force and the leftward tension of the spring 66 are balanced. .

In other words, the friction force generated between the tip of the spindle 23 and the slope due to the tensile force becomes larger than the component force on the slope of the tensile force of the spring 66, which has become smaller.
3 stops.

While the above operations are being carried out, the pulse output of the linear electronic micrometer 20 is introduced into the reversible counter 80, which adds or subtracts the pulse output according to the moving direction of the spindle 23, and the counting output is It is sent to the peak hold circuit 90, and the peak hold circuit 90
The output of is sent to a comparator, not shown. Corresponding values for the upper and lower limits of the appropriate groove depth are set in advance in the comparator, and a comparison command applied after a predetermined period of time has elapsed since the sending of the operation command to the left of the first air cylinder 65 causes the peak to be reached. The peak output of the hold circuit 90 is compared with the corresponding upper and lower limit values. The output of the peak hold circuit 90 at this time is the deepest part depth C of the groove S.
As a result of the above comparison, if the value exceeds the upper and lower limit values, the humpator sends a lighting output to the lamp to notify that it is defective. After the comparison is completed, the air cylinders 75+65 are operated upward and to the right again to return each movable body 61, 71 to the preparation position, and then index and move the clamp base 40 of the can 10. The mechanism rotates a predetermined angle,
The groove depths at different positions on the can are inspected again in the same manner as described above, and this series of inspections is subsequently carried out over the entire circumference of the can.

In the above embodiment, an air cylinder and a piston are used as driving means for the movable bodies 61 and 71. The supply current may be switched.

Further, in the above embodiment, the case where the upper and lower moving bodies 71 are coupled with the piston of the air cylinder 75 is illustrated, but both engage only when moving upward, and when moving downward, the moving bodies 71 etc. The same effect can be obtained even if the L7 rod is brought into contact with the seaming top surface by moving it by the force of the difference between its own weight and the resistance force of the spring 76.

As described above, when measuring the depth of a groove, the horizontally moving body crosses the groove from the inside to the outside only by the tension of the spring, and the tension of the spring decreases accordingly.
The speed of movement of the spindle of a linear electronic micrometer is extremely low, which ensures that the tip of the spindle reaches the deepest part of the groove, resulting in accurate measurements.
Furthermore, after the spindle passes through the deepest part, the tension of the spring becomes even smaller, so if the spindle moves slightly up the uphill slope leading to the deepest part, the spindle will immediately stop with a light contact.

[Brief explanation of the drawing]

Figures 1 and 2 are front sectional views of the seaming part, Figure 3 is a front view of a linear electronic micrometer for measuring groove depth, Figure 4 is a front view showing an embodiment of the present invention, and Figure 5. FIG. 2 is a front sectional view showing the engagement relationship between the air cylinder and the moving body. 61.71: Moving body 65.75: Air cylinder 66.76: Spring 20: Linear electronic micrometer Application agent Figure 1 Figure 2 Figure 3 Figure 4 Port

Claims (1)

[Claims] ], A horizontally movable body is supported movably on a horizontal support on a table, and only movement in one direction is transmitted between the end of a rod-shaped body serving as a driving means for this movable body and the movable body. A spring provided between the movable body and the supporting body causes the movable body to move in a direction opposite to the aforementioned movement, and is fixed to a side surface of the movable body. The upper and lower movable bodies are movably supported by the upper and lower supports.
A device for measuring the groove depth of the seam of a can where a linear electronic micrometer is fixed.