JP4519660B2 - Roll through hole inspection device - Google Patents

Description

  The present invention relates to a roll through hole inspection apparatus.

  In a copying machine, a laser beam printer, or the like, a roll having a through hole is used as a fixing device roll or the like (see, for example, Patent Document 1).

  Examples of the roll having the through hole include those having a large number of through holes extending in the circumferential direction around the core metal and those having a large number of through holes extending spirally in the longitudinal direction.

A roll having such a through-hole improves air permeability through the through-hole and prevents the roll from rising in temperature, thereby suppressing the thermal expansion of the roll and preventing the occurrence of paper wrinkles due to deformation of the roll. Used for etc.
Japanese Patent No. 2892755

  The through-holes of rolls with through-holes are difficult to control in diameter during processing, satisfying the functions of the through-holes by causing problems such as small diameter in the longitudinal direction and clogging due to spiral twisting. Difficult to do. Further, the through holes have unevenness such as large, medium, and small sizes due to processing convenience.

  As a general means for evaluating the through hole, there are a leak flow tester, a leak checker, and the like, but in the case of a minute hole (about 1 mm to 0.5 mm) such as a through hole of a fixing unit roll, fixing is performed. Since the amount of air flowing through the through hole varies greatly depending on the flow rate of air flowing to the container roll, there is a problem that the through hole cannot be determined with high accuracy.

  In order to solve the above problems, the invention described in claim 1 includes a pair of holding members capable of holding and releasing both end portions of a roll having a through hole, and an opening / closing means for opening and closing the pair of holding members. The one holding member is an air supply means for the through hole, the other holding member is an air discharge means from the through hole, and an air supply source for supplying air to the air supply means via an air pipe is provided. A roll through-hole inspection device comprising an air flow rate adjusting means capable of finely adjusting the air flow rate in the middle of an air pipe for sending air from an air supply source to the air supply means, with pressure detection means attached to the air supply means. It is said.

  In the invention described in claim 2, a flow meter is connected via a gate valve between the air flow rate adjusting means and the air supply means of the air pipe, and the air is switched between the air supply means and the flow meter. The roll through-hole inspection device according to claim 1 is configured to be capable of feeding.

  According to a third aspect of the present invention, the air supply means is divided into a common common piece regardless of the type of roll to be inspected and a switching piece that is switched according to the type of roll, and is inspected by exchanging the switching piece. The roll through-hole inspection device according to claim 1 or 2 configured to be compatible with all rolls.

  According to a fourth aspect of the present invention, the roll through-hole inspection device according to any one of the first to third aspects, further comprising a determination mechanism that determines whether the roll is acceptable based on a detection value of the pressure detection means. It is a feature.

  The invention described in claim 5 is characterized in that the determination mechanism is configured to be able to set and change a threshold value for pass / fail determination according to the type of roll to be inspected. Yes.

  According to the first aspect of the present invention, it is provided with a pair of holding members capable of holding and releasing both end portions of the roll having a through hole, and an opening / closing means for opening and closing the pair of holding members, and one holding member with respect to the through hole An air supply means is provided, the other holding member is an air discharge means from the through hole, and an air supply source is provided for supplying air to the air supply means via an air pipe, and a pressure detection means is provided in the air supply means. The air flow adjustment means that can finely adjust the air flow rate is installed in the middle of the air piping that sends air from the air supply source to the air supply means. It is possible to perform pass / fail determination of a roll having a hole and to obtain high pass / fail determination accuracy.

  According to a second aspect of the present invention, a flow meter is connected between the air flow rate adjusting means and the air supply means of the air pipe via a gate valve, and air is switched between the air supply means and the flow meter. By being configured to be able to supply, the flow rate of air can be easily checked at any time with a flow meter, so that the required inspection accuracy can be maintained routinely and easily.

  According to the invention of claim 3, the air supply means is divided into a common common piece regardless of the type of roll to be inspected and a switching piece that is switched according to the type of roll, and is inspected by exchanging the switching piece. By being configured to be compatible with all the rolls, it is possible to reduce the cost because the apparatus can be made common to various rolls. Further, since the switching piece can cope with each roll in detail, it is possible to easily create more advantageous inspection conditions and inspection conditions.

  According to the invention of claim 4, by providing the determination mechanism for determining whether or not the roll is accepted based on the detection value of the pressure detection means, it is possible to efficiently obtain a determination result without variation.

  According to the fifth aspect of the present invention, the pass / fail judgment threshold value of the judgment mechanism can be set and changed, so that accurate pass / fail judgment can be efficiently performed for various rolls. Moreover, since a common apparatus can be used for various rolls, cost reduction can be achieved.

  A pair of holding members capable of holding and releasing both ends of a roll having a through hole, and opening and closing the pair of holding members for the purpose of accurately performing pass / fail judgment of a roll having a minute through hole And an air supply means for supplying air to the air supply means via an air pipe. A means for providing a supply source, attaching a pressure detection means to the air supply means, and providing an air flow rate adjusting means capable of finely adjusting the air flow rate in the middle of an air pipe for sending air from the air supply source to the air supply means. It was realized.

  Hereinafter, embodiments embodying the present invention will be described together with illustrated examples.

  1 to 14 show an embodiment of the present invention.

  First, the configuration will be described. A roll 3 (see FIG. 2) having a through hole 2 to be inspected by the roll through hole inspection apparatus 1 of this embodiment shown in FIG. It is used for a vessel. This fixing device is configured to thermally fix an unfixed image by toner or the like transferred to a recording medium such as paper, and the roll 3 having the through hole 2 improves air permeability by the through hole 2. By preventing the temperature of the roll 3 from rising, the roll 3 is used for suppressing thermal expansion and preventing the occurrence of paper wrinkles due to deformation of the roll 3. The roll 3 includes a large-diameter columnar roll body 4 and a small-diameter columnar roll shaft portion 5 protruding from both ends of the roll body 4. The roll body 4 and the roll shaft portion 5 are arranged concentrically, and the roll shaft portion 5 is rotatably supported by a bearing (not shown) so that a recording medium such as paper can be fed by the roll body 4. Yes. The through hole 2 extends in the longitudinal direction of the roll body 4 and is opened at both ends (both end faces) of the roll body 4. A large number of through holes 2 are formed in the circumferential direction with respect to the roll body 4 so as to surround the periphery of the roll shaft portion 5. That is, they are arranged in an annular shape. The through hole 2 may extend in a spiral shape with respect to the axis of the roll body 4. The through hole 2 is a minute hole of about 1 mm to 0.5 mm, but has unevenness such as large, medium, and small sizes due to processing convenience.

  And the roll through-hole inspection apparatus 1 of this embodiment is a pair of holding members 11 and 12 capable of holding and releasing both ends of the roll 3 having the through-hole 2 and opening and closing to open and close the pair of holding members 11 and 12. Means 13 are provided. Here, the pair of holding members 11 and 12 are arranged vertically apart from the apparatus base part 14 and the standing plate-like apparatus main body part 15 standing substantially vertically from the apparatus base part 14 ( Top and bottom arrangement (The pair of holding members 11 and 12 can be arranged horizontally or inclined). The lower holding member 11 is fixed to the apparatus base portion 14, and the upper holding member 12 is installed to be movable up and down with respect to the apparatus main body portion 15. That is, the upper holding member 12 is fixed to the slide member 16 that is slidably disposed on the apparatus main body 15 so as to be lifted and lowered. The opening / closing means 13 is interposed between the apparatus main body 15 and the slide member 16, and the pair of holding members 11, 12 are relatively opened / closed by the opening / closing means 13 so that the through hole 2 is opened. It is comprised so that the both ends of the roll 3 which it has can be hold | maintained / released. As shown in FIG. 3, the opening / closing means 13 includes an actuator such as a cylinder 17 extending in the vertical direction, and a lifting guide rod 18 extending in the vertical direction. In addition, in the part below the slide area of the slide member 16 of the apparatus main body 15, there is provided a horizontal flange 19 that fixes the lower end of the cylinder 17 and guides the lower end of the lifting guide rod 18. .

  One holding member 11 is an air supply means 21 for the through hole 2, and the other holding member 12 is an air discharge means 22 from the through hole 2. Here, the lower holding member 11 is the air supply means 21, and the upper holding member 12 is the air discharge means 22.

  For this purpose, as shown in FIGS. 4 and 5, the air supply means 21 is provided with a substantially circular contact portion 23 capable of contacting the entire circumference with the lower end surface of the roll body 4 whose axis is directed in the vertical direction. At the same time, a small-diameter columnar shaft accommodating hole 24 capable of accommodating and holding the roll shaft portion 5 is formed at the center of the contact portion 23. Then, an air supply chamber portion 25 is formed by recessing an inner peripheral portion of the contact portion 23 corresponding to the opening of the through hole 2 into a medium-diameter cylindrical shape that is shallower than the shaft receiving hole portion 24. Furthermore, an air supply port 26 that communicates the air supply chamber portion 25 and the outside is formed on the side of the air supply means 21.

  Similarly, as shown in FIGS. 6 and 7, the air discharge means 22 is provided with a substantially circular contact portion 27 capable of contacting the entire periphery with the upper end surface of the roll body 4 whose axis is directed in the vertical direction. At the same time, a small-diameter columnar shaft housing hole 28 capable of housing and holding the roll shaft 5 is formed at the center of the contact portion 27. Then, an air discharge chamber portion 29 is formed by recessing an inner peripheral portion of the contact portion 27 corresponding to the opening of the through hole 2 into a medium diameter cylindrical shape shallower than the shaft accommodating hole portion 28. Further, an air discharge port 30 that communicates the air discharge chamber 29 and the outside is formed on the side of the air discharge means 22.

  And as shown in FIG. 1, the air supply source 32 which supplies air via the air piping 31 to the air supply means 21 is provided. For the air pipe 31, for example, a rubber tube or the like is used. As shown in FIG. 3, a valve 33 or the like having a check function is provided at a portion where the air pipe 31 is attached to the air supply port 26. As the air supply source 32, an air supply device 34 such as an air pump capable of supplying a small amount of air is used.

  Furthermore, an air leak amount measuring means 36 is provided. As this air leak amount measuring means 36, a pressure detecting means 37 is used. In this embodiment, the pressure detection means 37 is attached to the air supply means 21. As the pressure detection means 37, a differential pressure gauge 38 or the like adapted to detect a differential pressure from the atmosphere is used. That is, the differential pressure gauge 38 is connected to the air supply chamber portion 25. In FIG. 3, a regulator 39 and an on-off valve 40 are provided between the air supply chamber portion 25 and the differential pressure gauge 38.

  In addition, as shown in FIG. 1, an air flow rate adjusting means 42 capable of finely adjusting the air flow rate is provided in the middle of the air pipe 31 that sends air from the air supply source 32 to the air supply means 21. As the air flow rate adjusting means 42, for example, a flow rate control valve 43 that can regulate the air flow rate to 5 L / min or less and finely adjust the air flow rate with an accuracy of 0.1 L / min or less is used.

  A flow meter 45 is connected between the air flow rate adjusting means 42 and the air supply means 21 of the air pipe 31 via a gate valve 44, and air is switched to the air supply means 21 and the flow meter 45. Configure to be possible.

  Further, as shown in FIGS. 4 and 5, the air supply means 21 is divided into a common common piece 51 regardless of the type of the roll 3 to be inspected and a unique switching piece 52 that is switched according to the type of the roll 3. It is configured to be able to handle all the rolls 3 that are divided and inspected by exchanging the switching piece 52. The common piece 51 is fixed to the apparatus base portion 14 using a fastening member 53 such as a bolt. The switching piece 52 is placed on the common piece 51 in an exchangeable manner via a fixing pin 54 such as a knock pin. Pin holes for receiving fixing pins 54 such as knock pins are formed on the corresponding surfaces of the switching piece 52 and the common piece 51, respectively. The switching piece 52 has an outer diameter equal to that of the common piece 51 (similar to the case of air discharge means 22 described later), and an inner diameter corresponding to the corresponding roll 3 (same as the case of air discharge means 22 described later). The air supply chamber portion 25 is provided. The switching pieces 52 have length dimensions corresponding to the corresponding rolls 3 (air discharge means to be described later) so that the intervals between the air supply means 21 and the air discharge means 22 are substantially equal regardless of the length of the roll 3. 22). In this embodiment, the common piece 51 is provided with the shaft accommodating hole 24, and the switching piece 52 is provided with the air supply chamber portion 25.

  Similarly, as shown in FIGS. 6 and 7, the air discharge means 22 includes a common common piece 56 regardless of the type of the roll 3 to be inspected, and a unique switching piece 57 that is switched according to the type of the roll 3. And is configured to be compatible with all the rolls 3 to be inspected by exchanging the switching piece 57. The common piece 56 is formed integrally with the slide member 16. Alternatively, the common piece 56 is fixed to the slide member 16. The switching piece 57 is fixed to the common piece 56 using a fastening member 58 such as a bolt so as to be exchangeable. The switching piece 57 has an outer diameter (a1) equal to that of the common piece 56 and an air discharge chamber portion 29 having inner diameters (b1, b2) corresponding to the corresponding rolls 3 respectively. The switching pieces 57 have length dimensions (L1, L2) corresponding to the corresponding rolls 3 so that the intervals between the air supply means 21 and the air discharge means 22 are substantially equal regardless of the length of the rolls 3. To have. In this embodiment, the switching piece 57 is provided with a shaft accommodating hole 28 and an air discharge chamber 29.

  Furthermore, as shown in FIG. 8, a determination mechanism 61 is provided for determining whether the roll 3 is acceptable based on the detection value of the pressure detection means 37. The determination mechanism 61 is provided inside a control device unit 63 including an inspection operation control unit 62 for controlling various roll inspection mechanism units 60 of the roll through-hole inspection device 1. The determination mechanism 61 is configured to perform determination based on the converted signal after the detection value of the pressure detection means 37 is converted by the A / D converter 64.

  Then, the determination mechanism 61 is configured to be able to set / change the threshold value for pass / fail determination according to the type of the roll 3 to be inspected. For this purpose, the determination mechanism 61 includes a threshold value input unit 65 such as a meter relay. The determination mechanism 61 includes a timer capable of monitoring the air supply time.

  When half of the through holes 2 are inspected, for example, rubber packings 68 and 69 as shown in FIGS. 9 and 10 are attached to the air discharge chamber portion 29 of the air discharge means 22 so that the through holes 2 Try to block half. The rubber packings 68 and 69 are preferably removable.

  9 and 10, two pairs of holding members 11 and 12 each provided with rubber packings 68 and 69 having a phase difference of 90 degrees are arranged in parallel in one roll through-hole inspection apparatus 1, and the roll 3 By conducting the inspection in two steps while sequentially passing between the two pairs of holding members 11 and 12, it is possible to inspect all the through holes 2 with higher accuracy.

  At this time, although not shown in particular, a traverse slide portion capable of setting a plurality of rolls 3 is provided in the roll through hole inspection device 1, and a traverse mechanism is interposed between the traverse slide portion and the apparatus main body portion 15, By making it possible to sequentially pass between the two pairs of holding members 11 and 12 having the rubber packings 68 and 69 having the phases different by 90 degrees, it is possible to further improve the inspection efficiency.

  Next, the operation of this embodiment will be described.

  The inspection of the through hole 2 of the roll 3 by the roll through hole inspection apparatus 1 is performed according to the following procedure.

  First, as a preliminary preparation, the gate valve 44 is switched to the flow meter 45 side, and a minute amount of air flow from the air supply source 32 is finely adjusted using the flow meter 45 and the air flow rate adjusting means 42. This fine adjustment of the air flow rate is performed for each type of roll 3 based on data obtained as a result of a preliminary investigation as will be described later. After fine adjustment of the air flow rate, the gate valve 44 is switched to the air supply means 21 side.

  Next, the pair of holding members 11, 12 are opened and closed using the opening / closing means 13, and the roll 3 having the through hole 2 is set between the pair of holding members 11, 12. At this time, the roll shaft portion 5 is housed and held in the shaft housing holes 24 and 28 of the holding members 11 and 12, and the end surface of the roll body 4 is brought into contact with the entire circumference of the contact portion 23.

  And the threshold value of the pass / fail determination according to the kind of roll 3 to test | inspect is set to the determination mechanism 61. FIG. This threshold value is set in advance for each type of roll 3 as will be described later.

  When the above preparations are completed, the roll operation inspection unit 1 is operated by causing the inspection operation control unit 62 to control the various roll inspection mechanism units 60 to start the inspection. That is, a small amount of air from the air supply source 32 is supplied to the air supply chamber portion 25 of the air supply means 21 through the air pipe 31 and the air supply port 26, and the air discharge means 22 is passed from the air supply means 21 through the through hole 2. The air is discharged (leaked) from the air discharge port 30 formed in the air discharge chamber 29.

  When the roll through-hole inspection device 1 is activated, the timer monitors the air supply time, and the determination mechanism 61 reads the detection value of the pressure detection means 37 after a predetermined time has elapsed. The determination mechanism 61 performs a pass determination if the detection value of the pressure detection means 37 after a predetermined time has elapsed is smaller than a set pass / fail determination threshold, and performs a fail determination if the detection value is larger.

  Here, when an appropriate amount of air is supplied to the roll 3 having large, medium, and small irregularities in the size of the through-hole 2, a relationship that is almost in direct proportion as shown in FIG. Therefore, the size of the through hole 2 can be determined almost accurately based on the amount of air leakage. The air leak amount can be substituted by the detection value of the pressure detection means 37.

  For example, when air of 2 L / min, 3 L / min, 4 L / min is supplied to a roll 3 as shown in FIGS. 12 to 14, between 2 L / min between the hole diameter and the amount of air leakage In addition, a relationship that is close to a smooth, almost direct proportion (a relationship that can be approximated by a straight line that rises to the right) is obtained, and a relationship that is close to a direct proportion is not obtained at 3 L / min and 4 L / min (a straight line that rises to the right) It was impossible to approximate with In this case, since the size of the through hole 2 cannot be accurately determined by the amount of air leakage at 3 L / min and 4 L / min, 2 L / min is adopted as an appropriate air flow rate.

  In this way, an appropriate air flow rate that can obtain a relationship that is almost in direct proportion is examined in advance for each roll 3 and converted into data so that it can be set in the roll through-hole inspection apparatus 1. In addition, as a result of the above investigation, in order to effectively inspect the fixing roller such as a copying machine or a printer by this method, the air flow rate can be regulated to 5 L / min or less as the air flow rate adjusting means 42. It was confirmed that it was necessary and sufficient if the flow rate control valve 43 capable of finely adjusting the air flow rate with an accuracy of 0.1 L / min or less was used.

  When the through hole 2 is clogged, there is no discharge of air from the through hole 2, so that the detection value of the pressure detection means 37 increases even if the air flow rate is appropriate (differential pressure gauge). In the case of 38, the pressure rises with respect to the atmospheric pressure), so that the relationship that is almost in direct proportion is broken. Therefore, if an appropriate threshold value is set, it is possible to make a pass determination depending on the magnitude of the threshold value. This threshold value may be determined in advance when an appropriate air flow rate is investigated.

  Thus, according to this embodiment, the pair of holding members 11 and 12 capable of holding and releasing both ends of the roll 3 having the through hole 2, and the opening and closing means 13 for opening and closing the pair of holding members 11 and 12; One holding member 11 serves as an air supply means 21 for the through hole 2, and the other holding member 12 serves as an air discharge means 22 from the through hole 2, and air is supplied to the air supply means 21 via an air pipe 31. An air supply source 32 is provided, a pressure detection means 37 is attached to the air supply means 21, and the air flow rate can be finely adjusted in the middle of the air pipe 31 that sends air from the air supply source 32 to the air supply means 21. By providing the air flow rate adjusting means 42, an appropriate air flow rate can be obtained, so that it is possible to perform pass / fail determination of the roll 3 having the through hole 2 and to obtain high pass / fail determination accuracy. .

  In addition, a flow meter 45 is connected between the air flow rate adjusting means 42 and the air supply means 21 of the air pipe 31 via a gate valve 44, and air is switched to the air supply means 21 and the flow meter 45. Since the air flow rate can be easily checked at any time with the flow meter 45, the required inspection accuracy can be routinely and easily maintained.

  Further, the air supply means 21 is divided into common common pieces 51 and 56 regardless of the type of the roll 3 to be inspected, and switching pieces 52 and 57 that are switched according to the type of the roll 3. By being configured to be compatible with all the rolls 3 to be inspected by replacement, it is possible to reduce the cost because the apparatus can be made common to the various rolls 3. In addition, since the switching pieces 52 and 57 can be finely adapted to the roll 3, more advantageous inspection conditions and inspection conditions can be easily created.

  And by providing the determination mechanism 61 that determines the pass / fail of the roll 3 based on the detection value of the pressure detection means 37, it is possible to efficiently obtain a determination result without variation.

  Furthermore, since the threshold value for the pass / fail judgment of the judgment mechanism 61 can be set / changed, accurate pass / fail judgment can be efficiently performed for the various rolls 3. Moreover, since a common apparatus can be used with respect to the various rolls 3, the cost can be reduced.

  In addition, two pairs of holding members 11 and 12 each having rubber packings 68 and 69 having a phase difference of 90 degrees are juxtaposed in the roll through-hole inspection device 1, and the roll 3 is placed between the two pairs of holding members 11 and 12. By performing the inspection in two steps while passing through the two in order, it is possible to inspect all the through holes 2 with higher accuracy.

  Furthermore, a traverse slide portion on which a plurality of rolls 3 can be set is provided in the roll through-hole inspection apparatus 1, and a traverse mechanism is interposed between the traverse slide portion and the apparatus main body portion 15 so that the phase is 90 degrees different. By making it possible to sequentially pass between the two pairs of holding members 11 and 12 provided with the rubber packings 68 and 69, it is possible to further improve the efficiency of the inspection.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the embodiments are only examples of the present invention, and the present invention is not limited to the configurations of the embodiments. Needless to say, design changes and the like within a range not departing from the gist of the invention are included in the present invention.

1 is an overall configuration diagram of a roll through hole inspection device according to an embodiment of the present invention. It is the side view (a) and end view (b) of a roll which have a through hole. It is the elements on larger scale of FIG. It is side sectional drawing (a) and end elevation (b) of an air supply means. It is side sectional drawing (a) and an end elevation (b) of another air supply means. They are a side sectional view (a) and an end view (b) of the air discharge means. It is side sectional drawing (a) and an end elevation (b) of another air discharge means. It is a control system diagram including a judgment mechanism. It is an end view of the air discharge means to which the rubber packing is attached. It is an end view of the air discharge means to which another rubber packing is attached. It is a graph showing the relationship between the size of the through hole and the amount of air leakage when the air flow rate is appropriate. 12 is a graph similar to FIG. 11 when the air flow rate is 2 L / min for a roll. 12 is a graph similar to FIG. 11 when the air flow rate is 3 L / min for a roll. 12 is a graph similar to FIG. 11 when the air flow rate is 4 L / min for a roll.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Through-hole 3 Roll 11 Holding member 12 Holding member 13 Opening / closing means 21 Air supply means 22 Air discharge means 31 Air piping 32 Air supply source 37 Pressure detection means 42 Air flow rate adjustment means 44 Gate valve 45 Flow meter 51 Common piece 52 Switching piece 56 Common piece 57 Switching piece 61 Judgment mechanism

Claims (5)

A pair of holding members capable of holding and releasing both ends of a roll having a through hole and an opening / closing means for opening and closing the pair of holding members, one holding member serving as an air supply means for the through hole, and the other holding member As air discharge means from the through hole,
Providing an air supply source for supplying air to the air supply means via an air pipe;
A pressure detection means is attached to the air supply means,
An apparatus for inspecting a roll through-hole, comprising an air flow rate adjusting means capable of finely adjusting an air flow rate in the middle of an air pipe for sending air from an air supply source to an air supply means.   A flow meter is connected via a gate valve between the air flow rate adjusting means and the air supply means of the air pipe, and the air supply means and the flow meter can be switched and supplied to the air. The roll through-hole inspection device according to claim 1.   The air supply means is divided into a common common piece regardless of the type of roll to be inspected and a switching piece that can be switched according to the type of roll, and is configured to be compatible with all rolls to be inspected by exchanging the switching piece. The roll through-hole inspection device according to claim 1 or 2, wherein   The roll through-hole inspection device according to any one of claims 1 to 3, further comprising a determination mechanism that determines whether the roll is acceptable based on a detection value of the pressure detection means. The roll through-hole inspection device according to claim 4, wherein the determination mechanism is configured to be able to set and change a pass / fail determination threshold according to a type of roll to be inspected.

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