JP2015074511A - Tension adjustment device and transport apparatus with tension adjustment mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tension adjustment device which can uniformly adjust tensions of two annular belts, and a transport apparatus with the tension adjustment mechanism.SOLUTION: The transport apparatus is composed of a pair of two conveyor belts 2, 3, three pulley pairs, a belt drive mechanism which rotationally drives any one of the three pulley pairs thereby driving the conveyor belts 2, 3, a tension adjustment mechanism for adjusting tensions of the conveyor belts 2, 3, and so on. The tension adjustment mechanism is composed of : an eccentric shaft 21 having a basic shaft part 21a, a first eccentric part 21b and a second eccentric part 21c; first and second pulleys 22, 23 through which eccentric parts 21b, 21c of the eccentric shaft 21 are inserted respectively; a position adjustment mechanism 30 for adjusting a position of the eccentric shaft 21; and a rotation regulation mechanism 35 for regulating rotation of the eccentric shaft 21.

Description

  The present invention relates to a device for uniformly adjusting tension acting on two belts and a transport device including a tension adjusting mechanism.

  Conventionally, a belt driving mechanism including two belts has been used in a transmission, a transport device, and the like. For example, a transport device provided with a belt drive mechanism is used when transporting an inspection object in an appearance inspection device or the like, and such a transport device is disclosed in Japanese Patent Laid-Open No. 8-168727. The one provided in such an inspection apparatus has been proposed.

  The inspection apparatus includes a turntable-shaped alignment apparatus that aligns capsules as inspection objects input by a hopper, a belt conveyor that is a conveyance apparatus that conveys capsules aligned by the alignment apparatus, and is conveyed by the belt conveyor. The belt conveyor has a slit formed in the center in the length direction, and a pair of annular transport belts are disposed on both sides of the slit. Are driven by a pair of pulleys provided at both ends in the length direction, and one pulley is connected to a shaft of a driving motor. Further, this inspection apparatus is provided with a negative pressure chamber formed below the slit and a suction mechanism for making the negative pressure chamber have a negative pressure.

  According to this inspection apparatus, the capsules thrown in from the hopper are conveyed to the feeder part of the feeder while being aligned by the feeder, and are delivered from the delivery part onto the conveyor belt of the belt conveyor and conveyed by the conveyor belt. Is done. At this time, a suction force acts on the capsule delivered onto the transport belt through the slit, and the capsule is transported in a stable state without falling from the transport belt. The capsules transported by the transport belt are picked up by the image pickup means, and are sorted into normal ones and abnormal ones by appropriate sorting means based on the image pickup results.

JP-A-8-168727

  By the way, in the transport apparatus in the inspection apparatus as described above, there arises a problem that the capsule vibrates due to disturbance caused by the wavy phenomenon or vibration of the transport belt, the posture becomes unstable, and the inspection accuracy is lowered. In order to prevent this, a tension of a predetermined magnitude is applied to the two belts by an appropriate tension applying mechanism. Similarly, a tension of a predetermined magnitude is applied to the two belts provided in the transmission or the like in order to prevent the belt waviness or the like.

  However, the two annular belts provided in the transport device and the transmission have an error in accuracy such as a belt length error and a difference in elongation at the manufacturing stage, and due to a change with time, the elongation in the two belts, Since there is a considerable difference in length, it is difficult to apply a uniform tension to these two belts. For this reason, for example, even if a belt having a predetermined magnitude is applied to the two conveyor belts in the belt conveyor to prevent the belt waviness, the tension applied to the two belts is uniform. However, there is a problem in that vibration caused by a difference in tension acting on each belt is generated and inspection accuracy is lowered.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a tension adjusting device that can uniformly adjust the tension of two annular belts and a transport device that includes the tension adjusting mechanism. .

The present invention for solving the above problems is as follows.
A tension adjusting device that adjusts the tension of two endless annular belts wound around a plurality of pulleys spaced apart from each other,
An eccentric shaft comprising a base shaft portion, a first eccentric portion and a second eccentric portion whose axes are eccentric with respect to the axis of the base shaft portion, and the axes of the two eccentric portions being eccentric from each other;
A first rotating body and a second rotating body in which a through-hole penetrating the front and back is formed in the center, and
A support member that rotatably supports the base shaft portion of the eccentric shaft around the axis;
A position adjusting mechanism for adjusting the position of the eccentric shaft in a plane orthogonal to the axis of the base shaft portion;
The two eccentric portions of the eccentric shaft have their axes parallel to the axis of the base shaft portion, and the distance between each axis and the axis of the base shaft portion is equal.
In the first rotating body, the first eccentric portion is rotatably inserted into the through hole, and one of the two belts is wound around the outer periphery,
The second rotating body relates to a tension adjusting device in which the second eccentric portion is rotatably inserted into a through hole and the other of the two belts is wound around an outer periphery.

The present invention also provides:
A plurality of pulleys spaced apart from each other;
Two endless annular conveyor belts wound around the plurality of pulleys;
A drive mechanism for driving the pulley;
A tension adjusting mechanism for adjusting the tension acting on the conveyor belt,
The tension adjusting mechanism is
An eccentric shaft comprising a base shaft portion, a first eccentric portion and a second eccentric portion whose axes are eccentric with respect to the axis of the base shaft portion, and the axes of the two eccentric portions being eccentric from each other;
A first rotating body and a second rotating body in which a through-hole penetrating the front and back is formed in the center, and
A support member that rotatably supports the base shaft portion of the eccentric shaft around the axis;
A position adjusting mechanism for adjusting the position of the eccentric shaft in a plane orthogonal to the axis of the base shaft portion;
The two eccentric portions of the eccentric shaft have their axes parallel to the axis of the base shaft portion, and the distance between each axis and the axis of the base shaft portion is equal.
In the first rotating body, the first eccentric portion is rotatably inserted in the through hole, and one of the two conveying belts is wound around the outer periphery,
The second rotating body relates to a transport device in which the second eccentric portion is rotatably inserted into a through hole and the other of the two transport belts is wound around an outer periphery.

  According to the tension adjusting device and the tension adjusting mechanism, first, with the driving of the belt (conveying belt) stopped, the position adjusting mechanism causes the belt (conveying belt) to be stuck in a direction orthogonal to the axis of the base shaft portion. The eccentric shaft is moved in the plane to be adjusted, and its position is adjusted. At this time, the eccentric part of the eccentric shaft was inserted so that the tension acting on the two belts (conveying belts) wound around each rotating body became uniform by rotating the eccentric shaft about the axis. The first rotating body and the second rotating body swing around the axis of the base shaft portion. Therefore, the position of the eccentric shaft can be adjusted in a state where a uniform tension is applied to the two belts (conveying belts), and the magnitude of the tension acting on the two belts (conveying belts) after the tension adjustment. Can be made uniform.

  As described above, according to the tension adjusting device and the tension adjusting mechanism according to the present invention, a uniform tension can be applied to the two belts. It is possible to prevent the occurrence of problems due to the difference in the magnitude of the acting tension.

  In addition, in the transport apparatus provided with the tension adjusting mechanism, it is possible to prevent the occurrence of undulation and vibration due to the difference in tension acting on the two transport belts, and transport the object in a stable posture. be able to.

  The tension adjusting device and the tension adjusting mechanism preferably further include a rotation restricting mechanism for restricting the rotation of the base shaft portion of the eccentric shaft about the axis. In this case, after adjusting the position of the eccentric shaft and applying a uniform tension to the two belts (conveying belts), the rotation restricting mechanism causes the base shaft portion of the eccentric shaft to rotate about the axis. Can be regulated. In this way, it is possible to prevent the first and second rotating bodies from swinging around the axis of the eccentric shaft, so that a change in tension acting on the belt (conveying belt) when the belt is driven. Can be suppressed.

  As described above, according to the tension adjusting device and the tension adjusting mechanism according to the present invention, a uniform tension can be applied to two endless annular belts (conveying belts). Since the tension of each conveyor belt can be made uniform, the occurrence of undulation and vibration due to the difference in tension acting on the conveyor belt can be suppressed, and a stable posture can be achieved. The object can be conveyed.

It is a front view which shows schematic structure of the conveying apparatus which concerns on one Embodiment of this invention. It is an expanded sectional view from the arrow AA direction in FIG. It is a perspective sectional view showing a tension adjustment mechanism provided in the transport device. It is a perspective view which shows the tension adjustment mechanism provided in the conveying apparatus. It is a schematic diagram for demonstrating a motion of a tension adjustment mechanism.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the transport device 1 according to the present invention includes a pair of transport belts 2 and 3 that transport an object T, and a belt drive mechanism 5 that drives the transport belts 2 and 3. The guide mechanism 15 for guiding the conveyor belts 2 and 3, the tension adjusting mechanism 20 for adjusting the tension of the conveyor belts 2 and 3, and two side plates disposed so as to face each other with a space therebetween. 41 and 42 and a cover member 40 comprising a top plate 43 disposed in the upper gap in the side plates 41 and 42.

  The conveyor belts 2 and 3 are endless annular timing belts arranged side by side in the width direction, and the conveyor belts 2 and 3 are arranged so as to be substantially rectangular in front view. The object T is placed on the upper part forming the forward path.

  The belt drive mechanism 5 is disposed on the upper edge portions of the side plates 41 and 42 with a space between each other, and one end portion thereof is supported by the side plate 41, similarly to the rotary shafts 11 and 12, respectively. While being supported by the side plate 41, the rotary shaft 10 disposed below the rotary shaft 11 and spaced apart from the rotary shaft 11, and the outer peripheral surfaces mesh with the inner peripheral surfaces of the respective conveyor belts 2, 3. The rotating shafts 10, 11, and 12 are inserted through the through holes in a state where a part of the tooth surface meshes with a part of the inner peripheral surface of each of the conveyor belts 2 and 3. Three sets of pulley pairs 6, 7, 8, which are one set, and a drive motor 9 connected to one end of the rotating shaft 10 are provided. The pulley pair 6 is driven by driving the drive motor 9. The rotary shaft 10 rotates in a predetermined direction around the axis. The pulley pairs 7 and 8 are inserted through the rotation shafts 11 and 12 with bearings interposed therebetween, and rotate about the axis of the rotation shafts 11 and 12, respectively.

  The guide mechanism 15 includes two guide members 16 and 17 provided on the top surface of the top plate 43 so as to be along both sides of the respective conveyor belts 2 and 3. They are guided by these guide members 16 and 17.

  As shown in FIGS. 1 to 4, the tension adjusting mechanism 20 is spaced from the rotary shafts 10 and 12 below the rotary shaft 12 and to the right of the rotary shaft 10 (right side as viewed in FIG. 1). The eccentric shaft 21 disposed at a distance, the first and second pulleys 22 and 23 through which the eccentric shaft 21 is inserted, the position adjusting mechanism 30 for adjusting the position of the eccentric shaft 21, and the rotation of the eccentric shaft 21. It is comprised from the rotation control mechanism 35 which controls.

  The eccentric shaft 21 includes a base shaft portion 21a formed on one end side, a first eccentric portion 21b formed in an intermediate portion with respect to an axis line of the base shaft portion 21a, and the base shaft portion 21a. The axis is decentered with respect to the axis and the axis of the first eccentric portion 21b, and is composed of a second eccentric portion 21c formed on the other end side. Between the first eccentric portion 21b and the second eccentric portion 21c, The first fastening part 21d and the second fastening part 21e are formed. The axis of the first and second eccentric parts 21b and 21c and the axis of the base part 21a are parallel, and the distance between the first eccentric part 21b and the base part 21a is the second eccentric part 21c. The distance between the axis and the axis of the base shaft portion 21a is equal. 2 represents the axis of the base shaft portion 21a, and the alternate long and short dash lines L2 and L3 represent the axes of the first eccentric portion 21b and the second eccentric portion 21c, respectively.

  Further, the base shaft portion 21a of the eccentric shaft 21 is inserted into a through hole 27a formed through the support body 27 through the front and back surfaces with the bearing 28 interposed. The support body 27 is formed with a screw hole 27b that communicates with the through hole 27a and whose axis is orthogonal to the axis of the through hole 27a. 41a is housed so as to be movable along a direction parallel to the axis of the screw hole 27b.

  The first and second pulleys 22 and 23 are formed with through holes 22a and 23a penetrating the front and back, respectively, and tooth surfaces that respectively mesh with the inner peripheral surfaces of the conveyor belts 2 and 3 are formed on the outer peripheral surfaces. Has been. The first pulley 22 is inserted with the first eccentric portion 21b of the eccentric shaft 21 with the bearing 24 interposed in the through hole 22a, and the second pulley 23 has the bearing 25 interposed in the through hole 23a. In this state, the second eccentric portion 21c is inserted, and the conveyor belt 2 is wound around the first pulley 22, and the conveyor belt 3 is wound around the second pulley. The position of the bearing 24 is fixed in a state where the bearing 24 is in contact with the recess 22b and the first fastening portion 21d formed on the inner peripheral surface of the first pulley 22, and the bearing 25 is located inside the second pulley 23. The position is fixed in contact with the recess 23b and the second fastening portion 21e formed on the peripheral surface.

  The position adjusting mechanism 30 is inserted into a through hole 41b formed so that the tip end portion is screwed into the screw hole 27b of the support 27 and the storage hole 41a communicates with the outside of the side plate 41. A position adjusting screw 31 is provided. A hexagonal hole 31a to which a hexagonal crank can be appropriately attached is formed on the rear end surface of the position adjusting screw 31.

  Thus, according to the position adjusting mechanism 30, after the hexagonal crank is appropriately attached to the hexagonal hole 31a of the position adjusting screw 31, the position adjusting screw 31 is rotated by the hexagonal crank, whereby the support body 27 is moved. It can be moved within the storage chamber 41a, and the support 27 can be fixed at an arbitrary position.

  The rotation restricting mechanism 35 has a through hole 36a penetrating the front and back, a split groove 36b communicating with the through hole 36a, an opening on the lower surface, open on both wall surfaces of the split groove 36b, and above the split groove 36b. A regulating member 36 having an engagement hole 36c in which a thread groove is formed, a screw portion is formed at the front end portion, a hexagonal hole 37a is formed at the rear end surface, and the screw portion is formed in the engagement hole 36c. The clamp screw 37 is inserted into the engagement hole 36c so as to be screwed into the screw groove. The base shaft portion 21a of the eccentric shaft 21 is inserted into the through hole 36a of the restriction member 36. According to this rotation restricting mechanism 35, the hexagonal crank is appropriately attached to the hexagonal hole 37 a of the clamp screw 37, and then the clamp screw 37 is rotated, whereby the width of the dividing groove 36 b is reduced and the restricting member 36 is penetrated. The rotation of the eccentric shaft 21 inserted through the hole 36a is restricted.

  Next, a process of transporting the object T by the transport apparatus 1 of the present example having the above configuration will be described.

  In the transport apparatus 1 of this example, when the driving of the transport belts 2 and 3 is started, the tension acting on the transport belts 2 and 3 is adjusted by the tension adjusting mechanism 20.

  More specifically, first, the position adjusting screw 31 of the position adjusting mechanism 30 is rotated in a state where the operation of the drive motor 9 is stopped and the eccentric shaft 21 is rotatable about the base shaft portion 21a. Then, the support 27 in the storage chamber 41a is moved. Thereby, the eccentric shaft 21 moves in the same direction together with the support 27, that is, the first pulley 22 through which the first eccentric portion 21b of the eccentric shaft 21 is inserted and the second pulley 23 through which the second eccentric portion 21c is inserted. Move in the same direction, and tension acts on the conveyor belts 2 and 3.

  At this time, since the first pulley 22 and the second pulley 23 swing around the axis of the base shaft portion 21 a of the eccentric shaft 21, uniform tension acts on the transport belts 2 and 3. This will be described with reference to FIG. FIG. 5 is a schematic diagram for explaining the principle that a uniform tension acts on the conveyor belts 2 and 3. In FIG. 5, reference symbol O denotes the rotation center (base shaft portion) of the base shaft portion 21 a. 21a, the axis of 21a), M is the rotation center of the first pulley 22 (axis of the first eccentric portion 21b), and N is the rotation center of the second pulley 23 (axis of the second eccentric portion 21c). The solid line arrow indicates the direction and magnitude of the moment acting on the pulleys 22 and 23, and the dotted line arrow indicates the rotation direction of the base shaft portion 21a.

  FIG. 5A shows a state when the tension acting on the transport belt 2 becomes larger than the tension acting on the transport belt 3 at the moment when the first pulley 22 and the second pulley 23 are moved downward. FIG. At this time, since the force that the first pulley 22 receives from the conveyor belt 2 is larger than the force that the second pulley 23 receives from the conveyor belt 3, as shown in FIG. The moment that acts is greater than the moment that acts on the second pulley 23. Accordingly, the eccentric shaft 21 rotates in the direction of the dotted arrow, in other words, the first pulley 22 and the second pulley 23 swing around the axis of the base shaft portion 21a.

  The eccentric shaft 21 stops rotating when the moment acting on the first pulley 22 and the moment acting on the second pulley 23 are substantially balanced (FIG. 5B).

  Thus, while changing the position of the eccentric shaft 21 by the position adjusting mechanism 20, the eccentric shaft 21 rotates in a direction in which the moments acting on the first pulley 22 and the second pulley 23 become substantially equal, The conveyor belts 2 and 3 are uniformly tensioned.

  After a predetermined tension is applied to the conveyor belts 2 and 3, the clamping screw 37 of the rotation restricting mechanism 35 is rotated to narrow the width of the dividing groove 36 b of the restricting member 36, and the eccentric shaft 21. Regulate rotation.

  Thereby, the conveyor belts 2 and 3 are in a state where a uniform tension of a predetermined size is applied.

  Thereafter, the drive motor 9 is operated to drive the conveyor belts 2 and 3. Thereafter, an object T is appropriately transferred from an aligning device such as a vibration feeder onto the conveyor belts 2 and 3 to which a uniform tension is applied, and the transferred object T is transferred to the conveyor belt 2. , 3.

  As described above, according to the transport device 1 of the present example, since the tension acting on the transport belts 2 and 3 can be made uniform, the difference in tension acting on the transport belts 2 and 3 can be reduced. Occurrence of the undulation phenomenon and vibration caused can be suppressed, and the object T can be conveyed in a stable posture.

  As mentioned above, although one Embodiment of this invention was described, the specific aspect which this invention can take is not limited to this at all.

  In the transport device 1 of the above example, the transport belts 2 and 3 are wound around the three pairs of pulleys 6, 7 and 8 and the first pulley 22 and the second pulley 23 of the tension adjusting mechanism 20. For example, the conveyor belts 2 and 3 may be wound around two sets of pulley pairs and the first pulley 22 and the second pulley 23, and the number of pulley pairs is equal to the size of the conveyor device. What is necessary is just to set suitably according to the above.

  In the above example, the tension adjustment mechanism is provided in the transport device. However, the present invention is not limited to this, and tension adjustment is possible for other devices that require uniform tension between the two belts. A mechanism may be provided.

DESCRIPTION OF SYMBOLS 1 Conveyance device 2,3 Conveyance belt 5 Belt drive mechanism 6,7,8 Pulley pair 15 Guide mechanism 16,17 Guide member 20 Tension adjustment mechanism 21 Eccentric shaft 21a Base shaft portion 21b First eccentric portion 21c Second eccentric portion 22 First Pulley 23 Second pulley 22a, 23a Through hole 27 Support body 30 Position adjustment mechanism 31 Position adjustment screw 35 Rotation restriction mechanism 36 Restriction member 37 Clamping screw 41, 42 Side plate 43 Top plate T Target

Claims (4)

A tension adjusting device that adjusts the tension of two endless annular belts wound around a plurality of pulleys spaced apart from each other,
An eccentric shaft comprising a base shaft portion, a first eccentric portion and a second eccentric portion whose axes are eccentric with respect to the axis of the base shaft portion, and the axes of the two eccentric portions being eccentric from each other;
A first rotating body and a second rotating body in which a through-hole penetrating the front and back is formed in the center, and
A support member that rotatably supports the base shaft portion of the eccentric shaft around the axis;
A position adjusting mechanism for adjusting the position of the eccentric shaft in a plane orthogonal to the axis of the base shaft portion;
The two eccentric portions of the eccentric shaft have their axes parallel to the axis of the base shaft portion, and the distance between each axis and the axis of the base shaft portion is equal.
In the first rotating body, the first eccentric portion is rotatably inserted into the through hole, and one of the two belts is wound around the outer periphery,
The tension adjusting device, wherein the second rotating body has the second eccentric portion rotatably inserted in a through hole thereof, and the other of the two belts is wound around an outer periphery. .   The tension adjusting device according to claim 1, further comprising a rotation restricting mechanism that restricts rotation of the base shaft portion of the eccentric shaft about the shaft center. A plurality of pulleys spaced apart from each other;
Two endless annular conveyor belts wound around the plurality of pulleys;
A drive mechanism for driving the pulley;
A tension adjusting mechanism for adjusting the tension acting on the conveyor belt,
The tension adjusting mechanism is
An eccentric shaft comprising a base shaft portion, a first eccentric portion and a second eccentric portion whose axes are eccentric with respect to the axis of the base shaft portion, and the axes of the two eccentric portions being eccentric from each other;
A first rotating body and a second rotating body in which a through-hole penetrating the front and back is formed in the center, and
A support member that rotatably supports the base shaft portion of the eccentric shaft around the axis;
A position adjusting mechanism for adjusting the position of the eccentric shaft in a plane orthogonal to the axis of the base shaft portion;
The two eccentric portions of the eccentric shaft have their axes parallel to the axis of the base shaft portion, and the distance between each axis and the axis of the base shaft portion is equal.
In the first rotating body, the first eccentric portion is rotatably inserted in the through hole, and one of the two conveying belts is wound around the outer periphery,
In the second rotating body, the second eccentric portion is rotatably inserted in the through hole, and the other of the two conveying belts is wound around the outer periphery. . The transport apparatus according to claim 3, wherein the tension adjusting mechanism further includes a rotation restricting mechanism that restricts the base shaft portion of the eccentric shaft from rotating about the axis.

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