JP2012247246A - Tensile force detection mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tensile force detection mechanism which is capable of detecting only a load caused by a tensile force.SOLUTION: In a tensile force detection mechanism, a detection element is configured by integrally assembling a detection roller 2, a pillow block 3, and a slider 4 and the detection element is held freely movable horizontally by receiving a tensile force of a long material 7. The detection element is configured to slide horizontally along with a guide rail 5 fixed to a housing 100 by receiving the tensile force in a horizontal direction while fitting a sliding part 4b of the slider 4 to the guide part 5a. The guide rail 5 holds the detection element, receives and supports a load of the detection element in a gravity direction. When the detection element is moved in the horizontal direction by the tensile force, a distal end part 4c of the slider 4 is abutted to a base 10 of a tensile force detector 1 arranged within the housing 100, and the variation of the base 10 which is rotationally displaced by the tensile force is read.

Description

  The present invention relates to a tension detection mechanism that detects a tension applied to a long material such as paper, film, thread, and wire when the long material is unwound or wound.

The tension detector, which is the sensor part of the tension detection mechanism, is used in machines for controlling the tension of long materials. The tension detection target is a wide material with a predetermined width such as paper or film, and the detection roller is If it is long in the axial direction, a total of two units are used, one at each end of the shaft. The tension detection target is a non-wide material such as a thread or wire.
FIG. 9 shows a side view of a conventional tension detection mechanism.
The conventional tension detector 101 includes a base 110 that is fixed on a horizontal plane of the apparatus with, for example, a bolt, and that rotates and displaces about a hinge as a fulcrum by receiving downward (gravity direction) tension. A pillow block 103 is fixed on the base 110 of the tension detector 101 with a bolt, and a detection roller 102 is supported by the pillow block 103.

When a material tension is applied by arranging two guide rollers 106, one on each side of the detection roller 102, and passing a long material 107 as a tension detection member between the guide roller 106 and the detection roller 102. A load is applied downward to the tension detector 101, and the tension detector 101 outputs this load as an electrical signal. The machine for controlling the tension of the long material 107 takes in a load signal from the tension detector 101 and converts the load into tension to control and display the tension.
However, in the conventional tension detection mechanism, the base 110 of the tension detector 101 is configured to always receive the load due to the weight of the detection roller 102 and the pillow block 103 in the direction of gravity in addition to the tension of the tension detection member.

  In the case of a conventional tension detection mechanism, selection, installation, and calibration of the tension detector 101 are necessary as main operations for use. Selection of the tension detector 101 is based on the fact that the component in the vertical direction with respect to the surface of the base 110 of the tension detector 101, which is a combination of the load due to its own weight and the load due to the tension of the detection roller 102 and the pillow block 103 supporting the detection roller 102, is the rated load. (Allowable load) is not exceeded. Detailed selection calculation related to the tension detector 101 is described in a conventional document (for example, see Non-Patent Document 1).

  In addition, tension calibration is necessary to detect tension. Tension calibration includes zero adjustment for canceling the tare load of the tension detector 101 and span adjustment for predetermining the maximum tension, and the conditions such as the attachment angle of the tension detector 101 and the sheet feeding angle of the material detect the tension. Since they differ from each other, zero adjustment and span adjustment must be performed at each location. In the zero adjustment, the detection roller 102 and the pillow block 103 have a tare load, and the output signal of the tension detector 101 at this time is set as a zero adjustment value. In the span adjustment, a string is passed through the center of the detection roller 102, a weight as a span target value is hung at the end, and a signal obtained by adding a span up to the full scale tension to the output signal from the tension detector 101 at this time. Is the span adjustment value. The tension can be detected by performing such zero adjustment and span adjustment. Details regarding tension calibration are described in conventional literature (for example, see Patent Literature 1).

JP 2004-333298 A "Mitsubishi Electric Clutch and Brake <Powder Type / Hysteresis Type> Mitsubishi Tension Controller 2010 Edition", March 2010, issued by Mitsubishi Electric Corporation

  In the conventional tension detection mechanism, the tension detector receives a load, which is a combination of the weight of the detection roller and the pillow block and the strength of the tension applied to the base, as a vertical component with respect to the horizontal base surface. Therefore, when the rated load (allowable load) of the tension detector is selected only by the magnitude of the load due to the tension without considering the load due to the weight of the detection roller and the pillow block, the resultant force of both will determine the rated load of the tension detector. As a result, the proper selection was not made and the tension could not be detected.

The selection of the conventional tension detector is based on the range in which the total of the load due to the weight of the detection roller and pillow block, which is the vertical (downward) component with respect to the substantially horizontal base surface of the tension detector, and the load due to the tension does not exceed the rated load. It was done in. Therefore, if the load ratio due to the weight of the detection roller and pillow block is large and the load ratio due to tension is small, it is unavoidable to use a tension detector with a large rated load. There is a problem that the load ratio is reduced and the detection accuracy is deteriorated.
The present invention has been made to solve the above-described problems, and an object thereof is to obtain a tension detection mechanism in which a tension detector receives only a load due to tension.

  A tension detection mechanism according to the present invention includes a detector arranged to be movable in the horizontal direction by a tension received from a tension detection member to be conveyed, and a tension detector for detecting the tension applied to the detector. is there.

  According to the tension detection mechanism of the present invention, since the tension detector receives only the load in the horizontal direction due to the tension from the detector, the tension detection accuracy can be improved.

It is a principal part cross-sectional side view of the tension | tensile_strength detection mechanism of Embodiment 1 of this invention. It is a side view from the other direction of the tension | tensile_strength detection mechanism of Embodiment 1 of this invention. It is a figure which shows typically the magnitude | size of the tension | tensile_strength detected with the tension | tensile_strength detection mechanism of Embodiment 1 of this invention. It is a principal part cross-sectional side view of the tension | tensile_strength detection mechanism of Embodiment 2 of this invention. It is the principal part cross-sectional side view of the tension detection mechanism of Embodiment 3 of this invention, and the side view from another direction. It is a figure which shows the self-aligning pillow block of Embodiment 4 of this invention. It is a figure which shows operation | movement at the time of taking in the self-aligning pillow block of Embodiment 4 of this invention to a tension | tensile_strength detection mechanism. It is an enlarged view of the slider front-end | tip part of the tension | tensile_strength detection mechanism of Embodiment 5 of this invention. It is a side view of the conventional tension detection mechanism.

Embodiment 1 FIG.
In the present invention, since the tension detector receives only the load due to the tension, the detector receiving the tension such as the detection roller and the pillow block is separated from the tension detector, and the load due to the weight of the detector is gravity. It has been proposed that the load due to tension works in the horizontal direction in the direction (vertical direction). Therefore, in this application, both the horizontal component of the load due to the weight of the detector and the gravitational direction component of the load due to the tension perpendicular thereto are both zero, and the load due to the weight of the detector composed of the detection roller and the pillow block is all The guide rail (described later) receives and the tension detector is configured to receive only a load due to tension.

  Embodiment 1 of the present invention will be described below with reference to FIGS. FIG. 1 shows a cross-sectional side view of the main part of the tension detection mechanism according to Embodiment 1 of the present invention. In all the drawings, the XY plane indicates the horizontal plane, and the Y axis indicates the direction of gravity. The tension detector 1 is attached and fixed to, for example, an inner wall surface of the casing 100 of the apparatus by a fixing member such as a bolt (not shown), and the base surface is disposed on the YZ plane. The shaft of the detection roller 2 is arranged in parallel to the side wall surface (YZ plane) of the housing 100 and in the horizontal direction (Y-axis direction), and both axial ends of the detection roller 2 are supported by the pillow block 3. The The pillow block 3 is fixed to the flat head 4a of the nail-shaped slider 4 with a bolt or the like. The guide rail 5 is fixed to the housing 100 of the apparatus. The guide rail 5 can be fixed in various forms. In FIG. 1, as an example, a hole that penetrates the side wall of the housing 100 is provided, and a guide is provided in the hole in the horizontal direction (X-axis direction). The case where the rail 5 is inserted and fixed to the housing 100 is shown, and the guide portion 5a which is a sliding surface portion with the slider 4 of the guide rail 5 extends along the horizontal direction (X-axis direction). It shall be installed.

  As described above, the slider 4 is a nail-shaped member, and is an end portion (head portion 4 a) made of a flat plate portion that fixes the pillow block 3, and a cylindrical body portion 4 b that fits into the guide portion 5 a of the guide rail 5. (Sliding part) is connected to the body part 4b, and is mainly composed of a tip part 4c that comes into contact with the tension detector 1. The slider 5 is provided with a through hole opened as a guide portion 5a through the body portion 4b so as to be slidably held. When the body portion 4b is cylindrical, the opening shape of the guide portion 5a is as follows. It becomes a circle.

When the slider 4 is installed in the apparatus, the axial direction is horizontally arranged in the X-axis direction, and the trunk portion 4b serving as a sliding portion is passed through the guide portion 5a of the guide rail 5, and The extended tip 4c is directed to the inside of the housing and the head 4a is directed to the outside of the housing, and is slidably disposed along the direction in which the guide portion 5a of the guide rail 5 extends.
The convex portion 4 d provided at the boundary between the body portion (sliding portion) 4 b and the tip end portion 4 c of the slider 4 is a retaining member for preventing the body portion 4 b of the slider 4 from coming off from the guide rail 5. The slider 4 has a slidable range (indicated by an arrow) between the convex portion 4d and the head 4a.
In the example of FIG. 1, the axis of the sliding part (body part 4b) and the axis of the detection roller 2 are arranged on the same horizontal plane (XY plane). In addition, the slider 4 and the guide rail 5 are comprised with a rigid body.

FIG. 2 is a side view of the tension detection mechanism of FIG. 1 from the other direction. As shown in FIG. 2, the detection roller 2 is supported by two pillow blocks 3 that are spaced apart horizontally (in the Y-axis direction) along the side wall surface of the housing 100, and the axis of the detection roller 2. Are arranged in the Y-axis direction.
The shafts of the two guide rollers 6 arranged with the detection roller 2 interposed therebetween are also arranged on the Y axis, and are arranged in the vertical direction (Z-axis direction) in the order of one guide roller 6, the detection roller 2, and the other guide roller 6. As described above, the housing 100 is disposed on the outer surface. The two guide rollers 6 are fixed to the housing 100 by a fixing member (not shown). Tension detection is performed between the guide roller 6 and the detection roller 2 through a long material 7 that detects tension.

  When tension is applied to the long material 7, the slider 4 that holds the detection roller 2 receives a load due to tension and moves horizontally (in the X-axis direction) toward the tension detector 1, and the tip 4 c of the slider 4 moves. Press the load point 8 of the tension detector 1. The load point 8 of the tension detector 1 is a center point that receives a load. The tension detector 1 includes a sensor body, a base 10 of a rigid plate-like member, and a flexible hinge 9 that connects the base 10 and the sensor body as constituent members. The flat plate portion is arranged on the YZ plane so as to receive the load due to the tension from the (X-axis direction) vertically. The hinge 9 becomes a fulcrum when the tension detector 1 receives a load, and the base 10 is rotationally displaced about the hinge 9 as a fulcrum. The amount of rotation of the base 10 tends to increase as the load due to tension increases. The tension detector 1 outputs a load due to this tension as an electrical signal. This output electrical signal is converted into tension, and tension is controlled and displayed.

In the tension detection mechanism of the first embodiment, the reaction force of the load due to the weight of the detection roller 2, the pillow block 3, and the slider 4 in the gravity direction (Z-axis direction) is all received by the guide rail 5. Further, the slider 4 is movable only in a predetermined horizontal direction (X-axis direction), and other movements in the gravity direction (Z-axis direction) and the Y-axis direction are restrained by the guide rail 5.
Furthermore, the movable direction is taken so that the horizontal component (X-axis direction) becomes zero even with respect to the load due to the arbitrary weight in the gravity direction (Z-axis direction) of the detection roller 2, the pillow block 3, and the slider 4. Therefore, the tension detector 1 is configured to receive only a load due to tension.

FIG. 3 is a block diagram schematically showing a load received by the tension detector 1 when the long material 7 receives a tension in the tension detection mechanism according to the present invention, and is a vector diagram showing the load.
When the tension F is applied to the long material 7, the load W due to the tension is W = 2F × cos θ, which can be easily obtained. When two tension detectors 1 are used, the number of tension detectors 1 is ½, so W = F × cos θ. The tension detector 1 needs to select a rated load according to the magnitude of the load received. However, when selecting the tension detector 1, the rated load does not exceed the load W due to the tension and the closest value is obtained. Selection is possible by selecting. Further, since the detection error of the tension detector 1 is determined by the ratio of the load to the rated load, the closer the two are, the better the detection accuracy.

As described above, the tension detection mechanism of the first embodiment includes the detectors (slider 4 and detection roller 2) that are arranged to be movable in the horizontal direction by the tension received from the tension detection member (long material 7) to be conveyed. A structure that moves in the horizontal direction by the included tension (the pillow block 3 that is a bearing is also included in the detector.), And a tension detector 1 that detects the tension applied to the detector.
Furthermore, the detector is supported by the detection roller 2 that rolls according to the conveyance of the long material 7, and the guide roller 5 that supports the detection roller 2 and is attached to a fixed portion (corresponding to the casing 100). The slider 4 is slidably held in the slider 4 so that the detector slides in the horizontal direction under tension and is pressed against the tension detector 1.

The slider 4 has a structure including a sliding portion (same as 4b) longer than the guide portion 5a, which is fitted into a guide portion 5a provided in the guide rail 5 and extending in one direction.
The guide rail 5 is, for example, a cylindrical member, and a guide portion 5a is configured by a through hole penetrating in one direction with a predetermined opening dimension of the cylindrical member, and a columnar sliding portion 4b is fitted into the through hole. In this state, the slider 4 is held by the guide rail 5.
The slider 4 has a nail shape in which a head part 4a, a body part 4b, and a tip part 4c are arranged coaxially, holds the detection roller 2 on the head part 4a, the body part 4b becomes a sliding part, and the tip part 4c. Is configured to abut against the tension detector 1.

The tension detector 1 is held in a housing 100 that is a fixed portion, the guide rail 5 is fixed by being fitted into a hole that penetrates the side wall of the housing 100, and the slider 4 is moved into and out of the housing 100. It is arranged to communicate.
The guide rails 5 are horizontally spaced apart from the side walls of the housing 100, and the shaft of the detection roller 2 is horizontally disposed between the two guide rails 5. The long material 7 that is a member to be subjected to tension detection is guided by guide rollers 6 that are arranged above and below the detection roller 2 and is conveyed in a substantially vertical direction.

As described above, in the present invention, the tension detector 1 is configured to be tensioned from the horizontal direction (X-axis direction), and the horizontal direction of the load due to the weight of the slider 4 supporting the detection roller 2 in the gravity direction (Z-axis direction). By setting the (X-axis direction) component to zero, the tension detection error detected by the tension detector 1 can be reduced, and accurate detection is possible.
Furthermore, in a state where no tension is applied to the long material 7, the tension detector 1 does not receive any load, and therefore, it is possible to obtain an effect that the zero adjustment for canceling the tare load at the time of the tension calibration described above becomes unnecessary. it can.

Embodiment 2. FIG.
In the first embodiment described above, the slider 4 is formed in a nail shape, and the sliding portion held by the guide rail 5 and the tip portion that presses the tension detector 1 are continuous, and one projecting member The case where In the second embodiment, as shown in FIG. 4 which is a cross-sectional side view of the main part of the tension detection mechanism, the slider 41 combines a flat plate portion 41a and a plurality of protruding members 41b and 41c protruding from the back surface of the flat plate portion 41a. The case where it is formed in a different shape will be described.

  Here, the slider 41 includes a flat plate portion 41a that holds the detection roller 2 on the upper surface side via the pillow block 3, and a plurality of columnar protruding members 41b that protrude from the back surface side of the flat plate portion 41a in parallel to each other. 41c, and one of the protruding members (indicated by reference numeral 41c. Disposed between the two protruding members 41b serving as a sliding portion) is the tension detector 1 as the slider 51 slides. In the example of FIG. 4, there are two upper and lower protrusions 41 cc that contact the load point 8, and in the example of FIG. Part. As described above, in the second embodiment, the protruding member 41b serving as the sliding portion and the protruding member 41c that presses the tension detector 1 are provided separately.

Moreover, the holding state of the detector can be stabilized by providing a plurality of projecting members 41b serving as sliding portions.
Furthermore, as shown in the example of FIG. 4, the axis of the detection roller 2 is arranged in the Y-axis direction on a horizontal plane (XY plane) passing through the axis of the protruding member 41c. In FIG. 4, the axis of the protruding member 41 c indicated by the alternate long and short dash line is the central axis of the slider 41, and the detector can be stably held by holding the detection roller 2 on the central axis. It becomes.

Embodiment 3 FIG.
In the above-described first and second embodiments, when the long material 7 that is a tension detection member is conveyed in the substantially vertical direction along the side wall portion of the casing 100, the axis of the detection roller 2 is in the horizontal direction. An example is shown in which it is arranged and held in In the third embodiment, as shown in FIG. 5, the arrangement of the tension detection mechanism when the long material 7 is conveyed in the horizontal direction along the side wall portion of the housing 100 will be described.

FIG. 5A shows a cross-sectional side view of the main part of the tension detection mechanism of the third embodiment, and FIG. 5B shows another side view. In the third embodiment, the guide rails 5 are arranged at two positions on the side wall portion of the housing 100 so as to be spaced apart in the vertical direction, and the shaft of the detection roller 2 is vertically moved between the two guide rails 5. It is arranged in the direction (Z-axis direction). The tension detectors 1 are respectively arranged on the extension of the guide rail 5 in the housing 100, but errors in the values detected by the respective tension detectors 1 at two locations in the vertical direction are slight. The tension can be obtained as an average value of the values measured by the two tension detectors 1.
As described above, even when the guide rails 5 are arranged at two locations on the upper and lower sides and the axis of the detection roller 2 is directed in the direction of gravity, the tension detector 1 is provided with the detection roller 2 as in the first and second embodiments. In addition, since only the tension applied to the detector in the horizontal direction can be detected without being affected by the load in the gravity direction of the pillow block 3 and the slider 4, the detection accuracy can be improved.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described with reference to FIGS.
As described above, the detection roller 2 is movably held by the slider 4 via the pillow block 3 serving as a bearing, and these constituents serve as detectors. Is configured to move.
In the fourth embodiment, the advantage of the tension detection mechanism when the pillow block 3 as a bearing is configured by an automatic alignment mechanism will be described. 6A is a side view of the pillow block 3, and FIG. 6B is a cross-sectional view of the pillow block 3, showing that the bearing portion (bearing) is self-aligning. FIG. 7 shows a cross-sectional side view of an essential part of a tension detection mechanism incorporating the pillow block 3 of such an automatic alignment mechanism.
Even when an inclination as shown in the figure occurs when the detection roller 2 is attached, it can be adjusted within the allowable alignment angle range of the bearing, and the sliding resistance between the slider 4 and the guide rail 5 can be reduced. Thus, the tension detection mechanism can be assembled and formed with high accuracy.

Embodiment 5 FIG.
Next, in the fifth embodiment, the shape of the tip portion 4c of the slider 4 (or the tip portion 41cc of the slider 41) that contacts the tension detector 1 of the first to third embodiments will be described in detail.
In the above-described example, it has been described that the tip portion 4c (41cc) has a tapered shape, but the tip portion 4c (41cc) is located at the load point 8 as shown in an enlarged view in FIG. The abutting portion is rounded so as to be spherical. When the load due to tension is received, the base 10 of the tension detector 1 has already been described to be rotationally displaced about the hinge 9, but when the tip 4c (41cc) has a sharp conical shape, the base 10 It is conceivable that the contact position changes suddenly with the rotational displacement of the rotation, and the case where the tension detection is not stable is assumed. Therefore, by forming the tip 4c (41cc) of the slider 4 in a spherical shape and rounded shape, as shown in FIG. 8B, the slider 4 strongly presses the base 10 due to a load change due to tension. Even if the angle changes, the spherical tip 4c (41cc) can be in contact with the base 10, preventing the contact position from changing suddenly with respect to the rotational displacement of the base 10, and detecting stable and accurate tension. Is possible.

1 Tension detector,
2 detection rollers,
3 pillow block,
4, 41 slider,
4a head,
4b trunk (sliding part),
4c, 41cc tip,
4d convex part,
5, 51 guide rails,
5a, 51a guide part,
6 guide rollers,
7 materials
8 load points,
9 Hinge,
10 base,
41a flat plate part,
41b Protruding member (sliding part),
41c protruding member,
100 housing.

Claims (11)

  A tension detecting mechanism comprising: a detector arranged to be movable in a horizontal direction by a tension received from a tension detection member being conveyed; and a tension detector for detecting the tension applied to the detector.   The detector includes a detection roller that rolls according to conveyance of the tension detection member, and a slider that supports the detection roller and is slidably held in a horizontal direction by a guide rail attached to a fixed portion. 2. The tension detecting mechanism according to claim 1, wherein the detector slides in the horizontal direction in response to the tension and is pressed against the tension detector.   3. The tension detecting mechanism according to claim 2, wherein the slider includes a sliding portion that is longer than the guide portion and is fitted to a guide portion that extends in one direction provided on the guide rail.   The guide rail is a cylindrical member, and the guide portion is constituted by a through hole penetrating in one direction with a predetermined opening dimension of the cylindrical member, and the columnar sliding portion is fitted into the through hole. 4. The tension detecting mechanism according to claim 3, wherein the slider is held by the guide rail.   The slider has a nail shape in which a head portion, a trunk portion, and a tip portion are arranged coaxially, holds the detection roller on the head portion, the trunk portion becomes the sliding portion, and the tip portion becomes the above-mentioned The tension detection mechanism according to claim 3, wherein the tension detection mechanism is configured to abut against the tension detector.   The slider has a shape including a flat plate portion that holds the detection roller on the upper surface side, and a plurality of columnar protrusion members that protrude from the back surface side of the flat plate portion and are parallel to each other. 4. The tension detecting mechanism according to claim 3, wherein a tip portion that contacts the tension detector by sliding of the slider is included, and the other protruding member serves as the sliding portion.   The tension detector is held in a housing which is the fixing portion, the guide rail is fixed by being fitted into a hole penetrating the side wall portion of the housing, and the slider communicates with the inside and outside of the housing. The tension detection mechanism according to claim 2, wherein the tension detection mechanism is arranged as described above.   The guide rails are arranged in two locations on the side wall of the housing, spaced apart in the horizontal direction, and the shaft of the detection roller is arranged in the horizontal direction between the two guide rails. The tension detection mechanism according to claim 7, wherein:   The guide rails are arranged in two locations on the side wall of the housing, spaced apart in the vertical direction, and the shaft of the detection roller is arranged in the vertical direction between the two guide rails. The tension detection mechanism according to claim 7, wherein:   The tension detecting mechanism according to claim 2, wherein a portion of the detector that contacts the tension detector is formed in a spherical shape.   3. The tension detection mechanism according to claim 2, wherein the detection roller is held by the slider via a bearing portion which is an automatic alignment mechanism.

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