JP4879550B2 - Work thickness inspection device, work transport device and discharge device - Google Patents

Description

  The present invention detects minute fluctuations in the thickness of paper that is stopped and moving or a relatively thin material (hereinafter simply referred to as a workpiece) that cannot be visually determined, and is determined to be defective, for example. The present invention relates to a workpiece thickness inspection apparatus that can be used in a process of removing material, a workpiece transfer apparatus including the inspection apparatus, and a discharge apparatus that discharges a workpiece in response to a thickness variation caused by the inspection apparatus.

Conventionally, there are generally four methods for inspecting the thickness of this kind of work, and each has its own characteristic points and problems.
As a first means, there is a so-called laser optical non-contact type.
This means measures the thickness using a laser sensor.
The second means is what is called an actuating transformer contact type.
This means measures the thickness by pressing the tip of a contact-type sensor against a workpiece and electrically calculating the amount of variation.
The third means is called a mechanical caliper contact type.
With this means, an elliptical object rotates, and the thickness is measured at a large diameter portion.
Furthermore, there is what is called an ultrasonic non-contact type as a fourth means.

JP 05-324980 A JP 05-113325 A

Among such conventional means, the first laser optical non-contact type can be inspected only in the range where the laser is applied. Therefore, the moving workpiece can be inspected only in the line where the laser is applied in the traveling direction. As a result, if the thickness variation occurs outside the line hit by the laser, it is impossible to detect this.
In the second operating transformer contact type, a stopped work can be inspected only within a range where the sensor is in contact. Furthermore, the moving workpiece can be inspected only in the line where the sensor is in contact with the traveling direction. As a result, when the thickness variation occurs outside the line where the sensor is in contact, it is impossible to detect this.
The third mechanical caliper contact type is used for measuring a moving workpiece because the inspection unit is a rotating body. Since the measurement of the moving material can be performed only at a portion where the diameter of the inspection machine is large with respect to the traveling direction, the inspection portion is limited.
Further, the fourth ultrasonic non-contact type has a resolution of 0.1 mm to 1 mm and is not suitable for measuring a thin workpiece.

  In order to solve the problems of the conventional apparatus, the present inventors have been searching for various means that can be inspected in the area so that the thickness variation part can be detected even if it moves back and forth, left and right, We have developed a means to successfully solve this technical problem and propose it here.

  Accordingly, a first object of the present invention is to provide an inspection apparatus capable of accurately inspecting a variation in thickness of a thin workpiece with a simple mechanic. The second purpose is to develop a new workpiece transfer device that can inspect the area even if it is a thin workpiece, or even if the thickness variation part moves back and forth and right and left. Is to provide. A third object is to provide a discharge device capable of accurately discharging a defective workpiece using this inspection device.

To solve the above first technical problem, the inspection apparatus of the workpiece thickness according to claim 1 of the present invention, the rotation roller having a predetermined length in the width direction of the word over click within the support surface The rotating roller and the bar extending integrally from the rotating roller are opposed to each other and move away from the workpiece support surface with a support shaft provided at a part away from the rotating shaft center of the rotating roller as a center. The bar is fitted with an oil damper, and when the thickness of the workpiece varies, the bar moves in accordance with the movement of the rotating roller away from the workpiece support surface. around the shaft and displaced in a direction away from the workpiece conveying surface, the sensing element for detecting the displacement of this bar will cooperate in bar Mokerake, further the sensing element in a limit switch, the rotation roller and the follower The limit switch is set to be in a state just before the limit switch is turned from ON to OFF when the relative distance between the support surfaces of the workpiece is transported. When the workpiece thickness is normal, this limit switch Set to ON when the workpiece thickness is inferior, and at the same time , press the sensing element of the sensing element toward the side in contact with the bar to bring the individual rotating roller closer to the workpiece support surface. Consisting of a spring that moves in the direction and a spring that pulls the bar away from the workpiece support surface and operates the rotating roller in a direction away from the workpiece support surface, which are opposite to each other in the direction away from the workpiece support surface side. The working force is equally distributed in two directions, and the contact pressure of the rotating roller against the work support surface is made as zero as possible by balancing the two working forces. It is those that were kept in so that.

  According to the above configuration, first, the workpiece is inserted between the support surface and the rotating roller. At this time, if the rotating roller stays at the expected normal position without moving away from the workpiece support surface, the bar also stays at the expected normal position without changing. Therefore, the sensing element does not operate. As a result, this work is determined to have a normal thickness. However, when the rotating roller changes in a direction away from the work support surface, the bar also changes. Therefore, the sensing element is activated. As a result, this work is determined to have a poor thickness.

  The rotating roller and the bar integrally connected to the rotating roller can be moved in a direction away from the work support surface with a support shaft provided at a part away from the rotating shaft core of the rotating roller as a center. The arrangement arranged, that is, the arrangement applying the principle of the lever, and the arrangement arranged so that the contact pressure of the rotating roller with respect to the work supporting surface becomes as small as possible are the rotating roller and Even if the actuating force that moves the bar away from the workpiece support surface is a minute force, it works to make the change act sensitively, even if it is a very thin workpiece, Even if it is a change, it works to detect accurately and reliably, and the bar extended from the rotating roller amplifies the movement received by the rotating roller due to the variation in the thickness of the work and transmits it to the detecting element. It works so.

Therefore, this invention has the following effects.
As described above, in the workpiece thickness inspection apparatus according to claim 1 of the present invention, the rotating roller and the bar integrally connected to the rotating roller are configured by applying the principle of the lever, In addition, since the rotating roller and the bar are arranged so that the contact pressure with respect to the work supporting surface becomes as small as possible, the operating force that causes the rotating roller and the bar to move away from the work supporting surface is very small. Even if the workpiece is extremely thin and thick, even a minute change in thickness can be detected accurately and reliably. Therefore, it can be effectively used for inspections that are difficult to judge visually. In addition, since mechanical means are used, it can be manufactured and sold at a relatively low price.

Moreover, since the oil damper is attached to the bar, it can absorb the vibration caused when the work hits the rotating roller, and can prevent the malfunction due to the shaking of the bar. By the way, with the means using a spring, the spring itself vibrates and cannot absorb the shaking of the bar well. By using a liquid waiting for viscosity as the oil , for example, machine oil, the bar can be accurately and reliably prevented from vibrating.

Further, a limit switch is employed for the detection element, and the relative distance between the rotating roller and the workpiece support surface is in a state just before the limit switch is turned from ON to OFF when a workpiece having a normal thickness is conveyed. The limit switch is set to ON when the workpiece thickness is normal, and is set to OFF when the workpiece thickness is bad. Instead, the amount of movement from ON to OFF is smaller, so that the limit switch is turned on when normal and the limit switch is turned off when defective, so that minute thickness fluctuations can be detected more quickly .

Furthermore, the bar, the rotation roller by pulling on the side away a spring and a bar for actuating the press to pieces rollers sensing element on the side contacting the bar of the sensing element toward the workpiece support surface from the workpiece support surface Is composed of a spring that operates in a direction away from the workpiece support surface, and an equal force is applied in two opposite directions in the direction away from the workpiece support surface and in the direction approaching the workpiece support surface. As a result, the contact pressure of the rotating roller with respect to the work support surface is kept as zero as possible, so that even minute thickness fluctuations can be accurately detected with high accuracy. At the same time, the acting force in two directions opposite to each other is easy to manufacture using a simple member called a spring. without killing the variation in thickness, and, not easy to make a structure where the contact pressure against the workpiece support surface of the rotating roller becomes zero as possible so that an ideal zero.

According to a second aspect of the present invention, it is desirable that the work support surface is formed by a rotating roller having a predetermined dimension in the width direction of the work.
This is because, when this inspection apparatus is employed in, for example, a workpiece manufacturing or processing line, the structure of the workpiece can be easily transferred and the configuration of the line can be easily applied without requiring a significant change.

In this invention, as described in claim 3 , it is possible to obtain a workpiece transfer device that employs the workpiece thickness detection device described in claims 1-2 . Specifically, A detection device is provided for each location where the thickness of the workpiece varies on the workpiece conveyance path.

  According to the configuration as described above, unlike the conventional laser optical non-contact type, operating transformer contact type, and mechanical caliper contact type, the workpiece thickness detection device, which is inexpensive, can detect the moving workpiece. It is sufficient to place inspection devices where it is considered appropriate based on the rule of thumb. Of course, it is possible to continuously inspect workpieces that are continuously conveyed. The thickness variation is not unevenly detected, and it is possible to detect accurately and accurately without omission of inspection.

In addition, as described in claim 4 , a workpiece discharge device employing the workpiece thickness detection device described in claims 1-2 can be obtained. Specifically, the workpiece thickness inspection apparatus according to claim 1 or 2 is provided, and a defective workpiece discharge mechanism is provided on the downstream side of the workpiece conveyance path of the inspection apparatus. The inspection apparatus and the defective workpiece discharge mechanism are linked so that the defective workpiece discharge mechanism is operated when the workpiece is detected, and the defective workpiece is discharged out of the workpiece conveyance path.

  According to the above configuration, for example, when a machine is connected to the upstream side of the inspection device and a moving workpiece is continuously inspected, the accuracy of the defective workpiece can be accurately determined by linking the inspection device and the defective workpiece discharge mechanism. It is possible to discharge out of the route.

  The purpose of providing an inspection device that can accurately inspect the variation in thickness of thin workpieces with a simple mechanic is applied to thin paper as the target workpiece, and the variation in thickness, specifically It can be realized as an inspection device that detects the state where paper corners and edges are bent and superposed.

[Example 1]
First, a case where the workpiece thickness inspection apparatus according to the present invention is applied to an inspection apparatus that detects a state in which the thickness of the workpiece has changed due to bending of paper is described in detail below with reference to FIGS. .

  FIG. 1 is a conceptual diagram of a paper thickness variation inspection apparatus employing a workpiece thickness inspection apparatus 1. The thickness variation inspection apparatus 2 is basically opposed to a lower rotating roller 4 which is rotatably supported by a lateral support shaft 3 and forms a work support surface F, and the lower rotating roller 4. The upper rotating roller 5 that is one rotating roller, the inspection bar 6 that is integrally extended from the rotating roller 5, and the inspection that is linked to the extended end of the inspection bar 6. A limit switch 7 is provided as an element.

The lower rotating roller 4 fulfills the function of supporting the paper W that is fed from the previous process or directly inserted from below, and further functions as a transport roller for feeding it to the next process. An important task is to function as a support member for inspecting the thickness of the paper W in cooperation with the upper rotating roller 5.
The lower rotating roller 4 naturally needs to have a smooth surface in contact with the paper W, but can be replaced with a simple flat plate, specifically made of stainless steel or synthetic resin, if necessary.

  The upper rotating roller 5 is fixedly held by a lateral support shaft 8 parallel to the support shaft 3 of the lower rotating roller 4. Further, the end of the inspection bar 6 on the side of the rotating roller 5 is integrally fixedly connected to the lateral support shaft 8. The inspection bar 6 is made of a light material such as a light metal such as aluminum or a synthetic resin. The rotating roller 5 and the inspection bar 6 are connected to a terminal 6A on the rotating roller 5 side of the inspection bar 6 on a side supporting shaft 9 provided at a position slightly above the side supporting shaft 8 of the rotating roller 5. It is hold | maintained rotatably via. The positions shown in FIG. 1 indicate the relative positional relationship when the paper W has a normal thickness. In addition, the arrangement position of the horizontal support shaft 9 is set so as to be shifted on the virtual vertical line X passing through at least the axis of the horizontal support shaft 8 of the rotating roller 5 or on the upstream side of transporting the paper W. Needless to say. In other words, this structure is an application of the so-called lever principle, and the movement of the rotating roller 5 that rotates about the lateral support shaft 9 is amplified to several times the amount of rotation at the extended end 6B of the inspection bar 6. It is devised to work.

  The limit switch 7 is disposed below the extended end 6B of the inspection bar 6. The extension end 6B of the inspection bar 6 is always in contact with the upper end of the sensing element 10 whose tip protrudes upward from the limit switch 7. The contact state is a state just before the limit switch is turned from ON to OFF when the paper W having a normal thickness between the upper rotary roller 5 and the lower rotary roller 4 is sandwiched or conveyed. Thus, the sensing element 10 of the limit switch 7 is always pressed. The limit switch 7 is set so that the limit switch is turned on when the thickness of the paper W is normal and turned off when the thickness of the workpiece is poor. This uses the characteristic that the amount of movement from ON to OFF is much smaller than the amount of movement of the sensing element 10 from OFF to ON due to the structure of the limit switch 7. As a result, a minute thickness variation can be detected accurately with high accuracy.

  In the structure described above, the inspection bar 6 is always subjected to a reaction force toward the OFF side, that is, upward, by the built-in spring 7A that presses the sensing element 10 of the limit switch 7. Therefore, even with this structure, the weight of the inspection bar 6 that presses the sensing element 10 of the limit switch 7 and the pushing force of the built-in spring 7A that pushes up the sensing element 10 are balanced, and thickness variation can be detected with high accuracy. Can be achieved. However, if it remains as it is, the downward pressing force of the limit switch 7 due to the total weight of the inspection bar 6 tends to be insufficient, and the return of the limit switch 7 tends to deteriorate. As a result, erroneous detection still occurs.

  Therefore, the inspection bar 6 is given equal working force in two directions opposite to each other in the direction away from the rotating roller 4 below and the direction approaching downward around the horizontal support shaft 9. A configuration in which the contact pressure of the upper rotating roller 5 with respect to the lower rotating roller 4 is kept as low as possible by the balance of the acting force, and the limit switch 7 quickly returns from OFF to ON as soon as the detection is completed; A so-called balance mechanism is required. The specific structure will be described below.

  The spring 11 that resists the pressing force of the spring 7A that presses the sensing element 10 of the limit switch 7 upward is set so that the contact pressure of the upper rotating roller 5 to the lower rotating roller 4 becomes as low as possible. It is attached to the extended end 6B of the inspection bar 6. Needless to say, the spring 11 is set so that the extended end 6B of the inspection bar 6 is always pulled downward. In addition, it is important to employ a spring having a small spring coefficient so that the spring force does not kill the fluctuation of the thickness of the paper W with a strong pressure.

Thus, by providing the extension end 6B of the inspection bar 6 with the spring 11 that pulls it downward, the contact pressure of the upper rotating roller 5 with respect to the lower rotating roller 4 is kept as low as possible. Be drunk. As a result, minute thickness fluctuations can be accurately detected with high accuracy. In particular, in the case of thick paper W, it may be difficult to return while the limit switch 7 is in the OFF state. However, by providing this spring 11, the balance with the limit switch 7 can be well balanced, and even after the thick paper W is detected, the limit switch 7 quickly returns to the ON state, and a small thickness fluctuation is also caused. Detection can be performed with higher accuracy and more accurately.

Further, the inspection bar 6 is provided with an oil damper 12 to absorb vibrations of the inspection bar 6 and prevent erroneous detection.
For example, when another processing machine or the like is connected to the upstream side of the wall thickness fluctuation inspection apparatus 2 to inspect fluctuations in the thickness of the moving paper W, the paper W sent from the previous process is moved to the upper rotating roller. Often hits 5. The inspection bar 6 reacts sensitively to this impact, and erroneous detection may occur. By using a viscous liquid such as machine oil for this erroneous detection, vibration can be absorbed well, and as a result, malfunction of the limit switch 7 can be prevented.
In this case, means using a spring can be considered. However, when an impact is applied, the spring itself vibrates, and as a result, the vibration of the inspection bar 6 cannot be absorbed well.

  Further, in the structure shown in FIG. 3A, the lower rotating roller 4 is arranged in three in the width direction of the paper W, and the upper rotating roller 5 correspondingly corresponds to the lower rotating roller 4. It is arranged in the form of being divided into three with a width equivalent to the width of.

  In this way, in particular, the upper rotating roller 5 is equal to the lateral width of the lower rotating roller 4, in other words, equal to or slightly longer than the width of the transport path L of the paper W, and thus occurs at any location on the paper W. Thickness fluctuations can all be accurately detected, and detection is far superior to any of the conventional methods such as laser optical non-contact type, actuating transformer contact type, mechanical caliper contact type, and ultrasonic non-contact type. Demonstrate the effect.

  As shown in FIG. 3B, the upper rotating roller 5 has a width that is shorter than that shown in FIG. 3A, and the thickness of the paper W on the transport path L varies. It may be provided every time (it is arranged only on the left and right sides in the figure based on the data obtained from the rule of thumb).

  The workpiece thickness inspection apparatus 1 having such a structure first feeds or inserts the paper W between the lower rotating roller 4 and the upper rotating roller 5 as shown in FIG. At this time, if the upper rotating roller 5 remains in the expected normal position without moving in a direction away from the peripheral surface of the lower rotating roller 4 (state of FIG. 1), the inspection bar 6 also changes. Stay in the expected normal position without. Therefore, the limit switch 7 is in the ON state. As a result, the paper W is determined to have a normal thickness. However, when the upper rotating roller 5 changes in a direction away from the peripheral surface of the lower rotating roller 4, the inspection bar 6 also changes in conjunction with the movement of the upper rotating roller 5. As a result, the limit switch is turned off, and it is determined that the paper W has a bad thickness.

The upper rotating roller 5 and the inspection bar 6 integrally connected to the upper rotating roller 5 are provided on the lateral support shaft 9 provided at a position away from the rotational axis of the upper rotating roller 5. Is arranged so as to be displaceable in the direction away from the lower rotating roller 4, that is, a configuration applying the principle of the lever, and the contact pressure of the upper rotating roller 5 with respect to the lower rotating roller 4 Is arranged such that the upper rotating roller and the inspection bar 6 are moved away from the lower rotating roller 4 even if the operating force is a very small force. Even if the paper W is extremely thin and has a minute change in thickness, it works to detect it accurately and reliably. In addition, the inspection bar 6 extended from the upper rotating roller 5 functions to amplify the movement received by the upper rotating roller 5 due to the variation in the thickness of the paper W and transmit it to the limit switch 7. Further, even when the paper damper W collides with the upper rotating roller 5, the oil damper 12 uses a viscous liquid such as machine oil to transmit the shock without transmitting vibration to the inspection bar 6. This can be absorbed well and malfunction of the limit switch 7 can be prevented in advance.

  Therefore, in the workpiece thickness inspection apparatus 1 described in this embodiment, the upper rotating roller 5 and the inspection bar 6 integrally connected to the upper rotating roller 5 apply the lever principle. The upper rotary roller 5 is arranged so that the contact pressure of the upper rotary roller 5 with respect to the lower rotary roller 4 becomes as low as possible. Even if the operating force to move away from the rotating roller 4 is a minute force, it is sensitively sensed and changed, and even if it is a very thin paper W, it is also a minute change in thickness. Can be detected accurately and reliably. Therefore, it can be effectively used for inspections that are difficult to judge visually. In addition, since mechanical means are employed, it can be manufactured and sold at a relatively low price, and has a great industrial value.

[Example 2]
The basic structure of the present invention has been described so far. A case where a paper thickness variation inspection apparatus is implemented using the workpiece thickness inspection apparatus 1 will be described below.
FIG. 4 is a plan view showing the entire structure of the paper thickness variation inspection apparatus.
The paper thickness variation inspection device 2 includes a paper transport device C (see FIG. 5) and a workpiece thickness inspection device 1 (see FIG. 7) disposed thereabove.

First, the transport apparatus C for the paper W is configured as follows.
As shown in FIGS. 4 to 6, on the frame (machine frame) 13, a pair of upper and downstream sides are close to each other along the transport direction of the paper W (direction indicated by the arrow in the drawing), and the lower rotating roller 4 Each group is fixedly held on a rotating shaft 14 that serves as the lateral support shaft 3. As shown in FIG. 5, a timing belt 16 linked to the drive motor 15 is stretched around the upstream rotating shaft 14 </ b> A. Further, the shaft end of the upstream rotary shaft 14A and the downstream rotary shaft 14B opposite to the side where the timing belt 16 is stretched is linked and linked by a transmission timing belt 17, and the drive motor 15 is transmitted to the downstream rotary shaft 14B via the upstream rotary shaft 14A. Further, as shown in FIG. 6, an idler shaft 18 is further provided further downstream from the downstream rotary roller 4B, and a pulley 19 held on the idler shaft 18 and the upstream rotary shaft are provided. A conveyor belt 21 made of an endless belt is stretched between the pulley 20 held by 14A. As shown in FIG. 5, the rotating roller 4 is divided into three parts in the width direction on both the upstream and downstream sides, and the pulley 20 is held between the rotating rollers on both the left and right sides and the center. Has been. Therefore, a pair of conveying belts 21 are provided at a predetermined interval in the width direction.

The workpiece thickness inspection apparatus 1 disposed above the transport mechanism C configured as described above is configured as follows.
First, the upper rotating roller 5 is arranged above the lower rotating roller 4 with its rotating peripheral surface facing each other. Specifically, as shown in FIGS. 4 and 6 to 8, in the lower rotating roller 4, the rotating roller 4 </ b> A <b> 1 on both sides in the width direction of the upstream rotating roller 4 </ b> A is respectively shown in FIG. ), An upper rotating roller 5A1 having an axial width equal to the axial direction of the rotating roller 4A1 is disposed opposite to the rotating roller 4A1. Further, the upper rotating roller 5B having an axial dimension substantially equal to the axial dimension of the rotating roller 4B1 above the central rotating roller 4B1 of the downstream rotating roller 4B among the lower rotating rollers 4B. Is placed. The upper rotating roller 5A1 on the both sides in the width direction and the central rotating roller 5B are respectively held by the pivot shaft 22 as the lateral support shaft 8. The axial width of the upper rotating roller 5A1 on both sides in the width direction is one-third to one-half axial dimension as shown in FIG. There may be.

  Also, as shown mainly in FIGS. 4 and mainly FIGS. 6 and 8, brackets 23 that rise upward from the respective pivot shafts 22 are integrally raised, that is, are relatively non-rotatably raised. Further, the inspection bar 6 is integrally extended from the upper end of each bracket 23 so as to be in a substantially horizontal posture toward the idle shaft 18 side, that is, the downstream side in the transport direction of the paper W. The inspection bar 6 is made of aluminum. This is to reduce the mass.

  Then, the meeting portion between the bracket 23 and the inspection bar 6, that is, the vicinity of the upper end of the terminal 6A on the rotating roller 5 side is rotatably held by the lateral support shaft 24 as the lateral support shaft 9, respectively. The bracket 23 is configured to be able to swing upward in the transport direction of the paper W with respect to the center of the paper 24. It should be noted that the position where the lateral support shaft 24 is provided is on a virtual vertical line that passes through at least the upstream rotation shaft 14A and the downstream rotation shaft 14B. Desirably, it is biased to the upstream side of the virtual vertical line in the transport direction of the paper W.

The limit switches 7 are provided below the extended end 6A of the inspection bar 6, respectively. Further, the oil damper -1 2 are continuously provided respectively on the lower side of the intermediate portion of the test bar 6. Further, the spring 11 for pulling the inspection bar 6 downward against the built-in spring (not shown) of the limit switch 7 is provided below the limit switch 7 of the inspection bar 6 and the oil damper 12. It has been. The limit switch 7, the oil damper 12, and the spring 11 have the same structure as described in the first embodiment, and the connection structure with each inspection bar 6 and the mutual functions are also described in the first embodiment.

  In the second embodiment, as shown in FIG. 6, the idle rotation is performed above the conveying belt 21 from the downstream side in the conveying direction of the paper W of the central rotating roller 5B among the upper rotating rollers. A top plate 25 is provided up to the vicinity of the pulley 19 held by the shaft 18. More specifically, as shown in FIGS. 4 and 6, the upper surface of the rotating roller 4B on the downstream side is positioned at a height corresponding to the upper peripheral surface of the rotating shaft 18, and the upper surface is positioned. The lateral width of each of the divided rotary rollers 4B is substantially the same as that of each of the rotating rollers 4B on the downstream side, and they are arranged at three locations between the conveying belts 21 and the outside thereof. It functions as a guide for preventing the paper W from colliding with the upper rotating roller 5, and the impact due to this collision is transmitted to the inspection bar 6, causing it to inadvertently vibrate, causing the limit switch 7 to malfunction. To prevent it. The top plate 25 has an upper surface arranged on the same plane as the transport path L, and supports and guides the paper W from below.

  When the paper W is sent between the lower rotating roller 4 and the upper rotating roller 5, the thickness of the paper thickness variation inspection apparatus configured in this way is three upper rotating rollers, that is, Detection is performed by the left and right rotating rollers 5A1 and the central rotating roller 5B. If the paper W has a normal thickness, the three rotating rollers 5A1 and 5B do not rotate at all and maintain the positions shown in FIGS. Therefore, the paper W is sent out downstream as it is. However, if any one portion is bent and polymerized, and there is a variation in thickness, the rotating roller (5A1, 5B) corresponding to that portion moves rearward and upward in the transport direction around the lateral support shaft 24. And turn. This rotation naturally rotates the inspection bar 6 as well. This rotation of the inspection bar 6 is greatly amplified on the extended end 6B side, and as a result, it reacts sensitively to minute thickness fluctuations. Based on the obtained good / bad information, defective products are excluded from the transport path L.

Further, the oil damper 12 shown above can absorb the impact of the paper W even if it collides with the upper rotating rollers 5A1 and 5B without transmitting the impact as vibration of the inspection bar 6. It can prevent malfunction. Furthermore, by providing the transport belt 21, the sent paper W can be transported in contact with the transport belt, and the unintentional lifting of the paper W can be reduced as much as possible. Is significantly less likely to collide with the upper rotating rollers 5A1 and 5B. Further, when the top plate 25 is used in combination, the inconvenience of the paper W being fed inadvertently colliding with the upper rotating rollers 5A1 and 5B can be reduced as much as possible. It is possible to prevent the limit switch 7 from malfunctioning by inadvertently vibrating the limit switch 7.

Example 3
Next, a work discharging apparatus for discharging the paper W, which has been determined to be defective by the paper thickness fluctuation inspection apparatus 2 shown in the second embodiment, to the outside of the conveyance path L, is described in FIGS. Will be described with reference to FIG.
The workpiece discharge device 26 includes the paper thickness variation inspection device 2 shown in the second embodiment and a discharge mechanism 27 disposed on the downstream side in the transport direction of the paper W.
The discharge mechanism 27 will be described in detail below.

  4-6, mainly as shown in FIG. 6, sufficient to allow the paper W to fall further downstream of the pulley 19 provided downstream of the paper thickness variation inspection apparatus 2 in the paper W conveyance direction. A rotating shaft 29 is provided across the machine frame 13 with a clear gap 28, and a flapper 30 having a width dimension at least equivalent to the width of the transport path L is integrally provided on the rotating shaft 29. The flapper 30 extends to a position where the extended edge 30A substantially contacts the upper peripheral surface of the pulley 19 provided on the downstream side in the transport direction of the paper W.

  Then, a part of the transport path L is configured so as not to hinder further downstream transport of the normal paper W. However, when the paper W determined to be defective by the thickness variation inspection apparatus 2 is transported, the rotating shaft 29 rotates backward in the transport direction of the paper W, and the flapper 30 is raised. Then, the conveying path L is blocked, and the gap 28 between the pulley 19 and the flapper 30 is opened. Therefore, the paper W determined to be defective is discharged downward from the gap 28 and stored in a defective product tray 31 provided at the lower part of the machine frame 13.

  The operation of the flapper 30 is performed via a solenoid 32 provided in the machine casing 13. The solenoid 32 is connected to the limit switch 7 of the paper thickness variation inspection device 2, and based on the inspection result of the limit switch 7, the detection signal is transmitted to the solenoid 32 to open and close the flapper 30. It is configured to be

  In FIG. 4 and FIGS. 6 to 8, reference numeral 33 denotes a thickness adjusting knob. The thickness adjusting knob 33 moves the height position of the entire limit switch 7 in the vertical direction in accordance with the thickness of the paper W to be detected. Although not shown in detail, specifically, the bolt portion of the knob 33 is connected to a lifting plate 34 that is arranged on the side surface of the inspection bar 6 and is attached to the machine frame 13 so as to be movable up and down. . The limit switch 7 is attached to the lift plate 34. When the handle portion of the knob 33 is rotated in the forward / reverse direction to raise and lower the lifting plate 34, the limit switch 7 is moved up and down together. Thereby, the ON / OFF timing of the inspection bar 6 and the limit switch 7 can be adjusted, and the thickness of the paper W to be inspected can be adjusted.

  Each of the embodiments described above and the structure employed therein can be used in combination with each other or combined with each other without departing from the intended technical problem.

1 is an overall conceptual diagram showing a first embodiment of a workpiece thickness inspection apparatus according to the present invention. It is explanatory drawing of an effect | action of the structure shown by FIG. FIG. 2 is a structural diagram of each rotating roller shown in FIG. 1, (A) is a front view of the main part, and (B) is a front view of the main part showing a modification. It is a top view which shows the whole structure of the paper thickness fluctuation | variation inspection apparatus using the workpiece | work thickness inspection apparatus which concerns on this invention, and a discharge device. It is a top view of the principal part which shows the conveying apparatus and discharge apparatus of the paper thickness variation inspection apparatus shown in FIG. FIG. 5 is a side view of FIG. 4. It is a top view of the principal part which shows the workpiece | work thickness inspection apparatus of the paper thickness fluctuation | variation inspection apparatus shown in FIG. It is a side view of the principal part which shows the paper thickness fluctuation | variation inspection apparatus shown in FIG.

DESCRIPTION OF SYMBOLS 1 ... Work thickness detection apparatus 2 ... Thickness variation inspection apparatus 3 ... Horizontal support shaft 4 ... Lower rotation roller 4A ... Downstream rotation roller 4B upstream Lower rotation roller 5 ... Upper rotation roller 6 ... Inspection bar 7 ... Limit switch 8 ... Lateral support shaft 9 ... Lateral support shaft 11 ... Spring 12 ... Oil damper 13 ... Machine frame 22 ... Lateral support shaft 27 ... Discharge mechanism 28 ... Gap 29 ... Rotating shaft 30 ... Flapper 31 ... Not applicable Non-defective tray 32 ... Solenoid C ... Conveying device F ... Work support surface L ... Conveyance path W ... Paper

Claims (4)

Rotating roller is provided so as to face the supporting surface having a predetermined length in the width direction of the word over click, bars integrally extend this rotating roller from the rotating roller rotation axis of the rotating roller It is arranged so that it can be shifted in the direction away from the work support surface around the support shaft provided in the part away from the work, and when the oil damper is attached to the bar and the thickness of the work varies, The bar moves in the direction away from the work conveying surface around the support shaft in accordance with the movement of the rotating roller in the direction away from the work support surface, and a detection element for detecting the change of the bar is linked to the bar. provided Te, further the sensing element in a limit switch, to match when the relative spacing of the rollers and the workpiece support surface carrying the workpiece normal thickness, the limit switch is oN Have been set to be in front of the state becomes Luo OFF, this limit switch is ON when the thickness of the workpiece is normal, when the thickness of the workpiece is defective is set to OFF, the in conjunction with bar Presses the sensing element of the sensing element toward the side that contacts the bar to actuate the individual rotating roller in a direction approaching the work supporting surface and pulls the bar away from the work supporting surface to pull the rotating roller to the work supporting surface. It is composed of a spring that moves in a direction away from the workpiece, and an equal working force is given in two directions opposite to each other in the direction away from the workpiece support surface and the direction of the rotating roller due to the balance of both acting forces. An apparatus for inspecting a thickness of a workpiece, characterized in that the contact pressure with respect to the workpiece supporting surface is kept as zero as possible . Word over click support surface inspection apparatus according to claim 1, wherein the workpiece thickness is formed by rotating rollers having a predetermined dimension in the width direction of the workpiece. Conveying device has been workpiece thickness detecting apparatus is provided with a test device of the thickness of Ruwa over click have been found provided for each portion varying the thickness of the workpiece on the workpiece conveying path according to claim 1-2. A work thickness inspection apparatus according to claim 1 is provided, and a defective work discharge mechanism is provided on the downstream side of the work conveyance path of the inspection apparatus, and is discharged when a defective work is detected by the inspection apparatus. by actuating the mechanism, so as to discharge the defective workpiece to the work conveyance path the discharge device of a work you characterized by that is by linking the discharge mechanism and the inspection device.

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