JP5341423B2 - Conveyor conveyor and weighing device including the same - Google Patents

Description

  The present invention relates to a conveyor that includes a driving pulley and a driven pulley that are provided to face each other via a frame, and an endless belt that can be rotated while being stretched by these pulleys. Further, the present invention relates to a conveyor that can avoid at least dropping of the driven pulley from the frame even when the belt is removed. The present invention also relates to a weighing device provided with the transport conveyor as a weighing table for articles to be weighed.

  As an example of a conveyor, a frame including a drive pulley connected to a rotational drive source and driven to rotate the belt, and a driven pulley driven as the belt rotates, and each pulley is rotatably attached to both ends. The thing of the structure provided with is known. In the transport conveyor having such a configuration, the frame functions as a belt rotation support member that supports the wound belt in the rotation direction, and also functions as an interval holding member that holds an interval between the pulleys.

  In the maintenance of the conveyor belt, it is necessary to remove at least the belt from the pulley and the frame, and depending on the application, it may be necessary to remove the pulley from the frame. In order to facilitate such maintenance, various techniques for simplifying attachment / detachment of belts and pulleys have been proposed.

  For example, Patent Document 1 discloses a technique of providing a detachable plate that can be slid in an inner direction of a belt conveyor device. According to this technology, there is provided a belt conveyor that can be easily attached / detached with a belt conveyor having a simple configuration, and that can easily adjust the tension of the belt, and a weighing device that measures the mass of an article using the belt conveyor. It is said that it is possible.

  Further, Patent Document 2 includes first to fourth arms that are erected on a gantry and have roller bearing portions at their upper ends, and among these, third and fourth arms that are erected on both left and right ends of the gantry. Discloses a carrier roller support device for a belt conveyor in which the roller bearings are movable in a direction away from the endless transport belt. In this technique, by providing the above configuration, each carrier roller can be replaced without lifting the transport surface of the belt conveyor, so that the replacement work can be easily performed by one person. .

  Further, Patent Document 3 discloses a belt conveyance unit used in a document feeding device of a copying machine, in which one side of the belt conveyance unit is pivotally supported by a document rapid-feeding device body and the other side via a lock device. A configuration in which the main body of the document feeder is detachably mounted is disclosed. In this technique, since the belt can be removed by a very simple operation by providing the above-described configuration, the belt can be easily cleaned and replaced by an operator.

By the way, as a measuring device using the above-mentioned conveyor, for example, as exemplified in Patent Document 4, a measuring conveyor that measures the weight of an article to be weighed while conveying the object to be weighed and a measuring device provided with this measuring conveyor are known. Yes. Such weighing conveyors and weighing devices are used in various applications. For example, when used in food weighing applications, it is necessary to frequently clean the weighing conveyor for hygiene management. In this case, it may be necessary to remove the belt or pulley (roller) and clean it. Alternatively, even when powders or highly viscous articles are weighed, it may be necessary to remove the belts and pulleys for cleaning.
Japanese Patent No. 3585673 Japanese Patent Laid-Open No. 11-029211 Japanese Utility Model Publication No. 60-014270 JP 2002-013971 A

  Here, in the conventional conveyor, the pulley can be easily removed from the frame by removing the belt (see, for example, Patent Document 2). This is because in maintenance and the like, it is often necessary to remove the pulley together with the belt, and therefore it is preferable that the pulley can be easily detached from the frame when the belt is removed. In other words, the configuration in which the pulley can be easily removed is a configuration in which the belt also serves as the pulley mounting member.

  However, the configuration in which the pulley can be easily removed from the frame is also a configuration in which the pulley easily drops from the frame. In particular, if the application requires frequent maintenance such as washing, such as food, the frequency of removing the belt increases, so the probability of accidentally dropping the pulley increases. The pulley is not limited to driving or driven, but is an important component for properly rotating the belt. For this reason, there is a risk of generating extra vibration during rotation due to slight deformation caused by dropping. Such extra vibrations not only prevent proper rotation of the belt, but also reduce the life of the bearing to load the bearing.

  Furthermore, when a conveyor is used for applications such as a weight sorter, the deformation of the pulley leads to a deterioration in measurement accuracy. For example, in a weighing conveyor and a weighing apparatus exemplified in Patent Document 4, a weighing sensor is connected to a transfer conveyor to measure an article (an article to be weighed or an article to be inspected) transferred on the transfer conveyor. become. Here, although the vibration due to the rotation of the conveyor conveys the measurement by the measurement sensor, it is a regular vibration and can be removed by filtering processing. However, vibration caused by pulley deformation becomes irregular and difficult to remove by processing such as filtering. Accordingly, the pulley deformation has a great influence on the measurement accuracy.

  Therefore, depending on the use of the conveyor, a high level of caution is required regarding the handling of the pulley. Therefore, it is required to avoid human error as much as possible so that the pulley does not fall even if the belt is removed. However, in order to prevent the pulley from falling even if the belt is removed, the pulley is strictly attached to the frame with a special attachment member, that is, independent so that the belt does not function as a pulley attachment member. It is necessary to have a configuration in which the pulley mounting member is provided separately. In this case, if the pulley is to be removed at the time of maintenance, an operation such as disassembling the pulley mounting member is required, so that the pulley cannot be easily removed, and the efficiency of the maintenance operation is reduced. Therefore, it has been difficult in the past to achieve both the prevention of the pulley from falling and the easy removal of the pulley.

  The present invention has been made to solve the above problems, and can effectively prevent the pulley from dropping from the frame even when the belt is removed, and the pulley can be easily detached from the frame, resulting in maintenance. It is an object of the present invention to provide a transport conveyor that can further improve work efficiency.

In order to solve the above problems, the conveyor according to the present invention has a drive pulley, a driven pulley, and a shape extending in a predetermined direction, and the drive pulley and the driven pulley can be rotated at both ends. a frame mounted, wound across the drive pulley and the driven pulley, and an endless belt which is driven to rotate by the drive pulley, the driven pulley side end portion of the frame, stretching of the rotation axis of the driven pulley And a pair of bearing members that support the rotating shaft of the driven pulley, and extend toward the outside of the frame at the driven pulley side end portion of the frame. pulley mounting portion is provided so as, at least one of the pair of bearing members, it and opening-bearing member that opens in the extending direction of the rotation axis of the driven pulley And, the opening motion bearing member is provided in an the frame in a state of extending in the predetermined direction outwardly, relative to the pulley mounting portion, extending outwardly of the axis of rotation of the driven pulley the pulley mounting portion as a fulcrum It is attached so as to be able to rotate or tilt while receiving a repulsive force, and is configured to open in the extending direction of the rotating shaft of the driven pulley by rotating or tilting to the outside in the extending direction of the rotating shaft of the driven pulley. it is, by the opening motion bearing member is opened as described above, a configuration in which the driven pulley is made removable from the frame.

  According to the above configuration, since at least one is an open bearing member that opens in the extending direction of the rotation shaft of the driven pulley, when it is desired to remove the driven pulley, the bearing members are opened by opening the open bearing member. The interval can be increased. Therefore, as long as the open bearing member is not opened, even if the belt is removed, the driven pulley can be held so as not to fall, and it can be easily driven by opening the open bearing member as necessary. The pulley can be removed. As a result, the deformation of the pulley can be avoided more effectively, so that the shortening of the bearing life can be suppressed, and the deterioration of the measuring accuracy can be suppressed when used for measuring purposes. The efficiency of the maintenance work of the conveyor can be further improved.

  In the transport conveyor, the pulley mounting portion is provided with a biasing member that biases the open bearing member in a direction opposite to the rotation or inclination of the rotation axis of the driven pulley outward in the extending direction. Preferably it is.

  In the transport conveyor, the driven pulley is rotatably attached to the pulley mounting portion by the pair of bearing members, and is perpendicular to the extending direction of the rotating shaft of the driven pulley and in the predetermined direction. It is preferable that a movable portion that can rotate and move the pulley mounting portion in a direction that intersects is preferably provided.

  Further, in the transport conveyor, the pulley mounting portion is configured such that the position of the rotation shaft of the driven pulley supported by the pair of bearing members can be pushed or retracted along the predetermined direction. It is preferable that a belt tension adjusting unit for adjusting the belt tension state is further provided.

  Further, in the transport conveyor, at the end of the rotation shaft of the driven pulley, a part thereof is cut out and opposed to each other, and a parallel surface parallel to the axis is formed. It is preferable that the bearing member is formed with a long hole-like shaft insertion hole having a width corresponding to the parallel surface, and the driven pulley is rotatably provided in the pair of bearing members.

  Further, in the transport conveyor, a pair of bearing members that support the rotation shaft of the drive pulley so as to oppose each other in the extending direction of the rotation shaft of the drive pulley to the drive pulley side end of the frame, The bearing member is provided with a bearing groove that receives the rotation shaft of the drive pulley, and is formed to protrude from the groove inner surface so as to narrow the width of the bearing groove. It is preferable that a return portion for preventing the shaft from dropping off is provided.

  Furthermore, the present invention includes a weighing device provided with the transport conveyor having the above-described configuration as a weighing table for the articles to be weighed. A typical example of the weighing device is a weight sorter that sorts and sorts articles to be weighed according to weight.

  As described above, the conveyor according to the present invention can effectively prevent the pulley from falling from the frame even when the belt is removed, and can easily remove the pulley from the frame. This can be further improved.

Preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout all the drawings, and redundant description is omitted.
[Embodiment 1]
FIG. 1 is a plan view showing a configuration of a transport conveyor according to Embodiment 1 of the present invention, and FIG. 2 is a plan view showing a state in which a driven pulley is removed from the transport conveyor shown in FIG.
[Overall configuration of transfer conveyor]
As shown in FIGS. 1 and 2, the conveyor according to this embodiment includes a frame 11, a drive pulley 12, a driven pulley 13, a belt 14, and a bearing member 15 for mounting the driven pulley 13 (hereinafter referred to as a driven pulley bearing). And a driven pulley mounting portion 51, and a bearing member 16 for mounting the drive pulley 13 (hereinafter referred to as a drive pulley bearing portion 16). In FIGS. 1 and 2, for convenience of explaining the positional relationship between the driven pulley 13 and the driven pulley bearing portion 15, the belt 14 and the frame 11 near the driven pulley bearing portion 15 are partially broken and displayed. ing.

  The frame 11 constitutes the skeleton of the entire transport conveyor, has at least a shape extending in a predetermined direction (the direction of arrow A in the figure), and the belt 14 rotates along the predetermined direction A. In the present embodiment, the frame 11 is formed on a flat plate having a planar shape. A driving pulley 12 and a driven pulley 13 are rotatably attached to both ends in the predetermined direction. The specific configuration of the frame 11 is not particularly limited, but a pair of vertical frames parallel to the predetermined direction A, a flat plate disposed between the vertical frames, and a vertical frame are orthogonal to the vertical frame. The structure provided with the reinforcement part spanned over can be mentioned.

  The drive pulley 12 is attached to one end of the frame 11 by a drive pulley bearing 16 and rotates the endless belt 14 by the rotation of the drive pulley 12 itself. The drive pulley 12 is connected to a drive source (such as a motor) and a drive transmission mechanism (such as a sprocket and a chain) (not shown) and the like, thereby rotating itself and transmitting a rotational driving force to the belt 14.

  The driven pulley 13 is attached to the position opposite to the driving pulley 12 by the driven pulley bearing portion 15 on the other end of the frame 11, and the belt 14 is stretched along the driving pulley 12 in the predetermined direction A. Hold on. Thus, when the belt 14 is rotated by the rotational driving force transmitted from the drive pulley 12, the driven pulley 13 is also rotated along with the rotation.

  Each of the drive pulley 12 and the driven pulley 13 has a columnar shape or a cylindrical shape, and is provided with a rotation shaft at both ends thereof. As these pulleys, for example, a configuration in which a rotating shaft is fitted into a bearing provided in a central portion of a cylindrical pulley main body can be exemplified. If it is this structure, a rotating shaft will rotate freely with respect to a pulley main body.

  The belt 14 has an endless shape and is wound around the drive pulley 12 and the driven pulley 13, so that the belt 14 is rotatably disposed on the outer periphery of the frame 11. And as above-mentioned, it rotates with the rotational driving force transmitted from the drive pulley 12 in the state stretched by the drive pulley 12 and the driven pulley 13, and conveys the articles | goods arrange | positioned on the upper surface. The belt 14 can be removed by pulling out the belt 14 from the side of the frame 11.

  The driven pulley mounting portion 51 is configured to rotatably mount the driven pulley 13 at the end of the frame 11, and the driven pulley 13 is a pair of driven pulley bearing portions that support the rotation shaft of the driven pulley 13. 15 is fixed to the end portion of the frame 11 by a driven pulley mounting portion 51. Of the both ends of the frame 11, if the end on the side to which the drive pulley 12 is attached is the end on the side of the drive pulley and the end on the side to which the driven pulley 13 is attached is the end on the side of the driven pulley, the driven pulley attachment 51 Is provided so as to extend to the outside of the frame 11 at the driven pulley side end.

In other words, the driven pulley mounting portion 51 has a configuration that extends toward the outside of the frame 11 along the predetermined direction A (the rotation direction of the belt 14), that is, a configuration that has a length in a one-dimensional direction. 11 are a pair of driven pulley bearing portions 15.
[Configuration of driven pulley mounting section and driven pulley bearing section]
As shown in FIGS. 1 and 2, the pair of driven pulley bearing portions 15 are provided at the driven pulley side end of the frame 11 so as to face each other in the extending direction of the rotation shaft of the driven pulley 13. As described above, it is attached to the frame 11 by the driven pulley attaching portion 51. The driven pulley 13 is rotatably held by supporting the rotation shaft of the driven pulley 13 with each other.

  In the present invention, at least one of the driven pulley bearing portions 15 is an open bearing member that opens in the extending direction of the rotating shaft of the driven pulley 13, and the driven pulley is removed from the frame by opening the open bearing member. It is removable.

  The specific configuration of the pair of driven pulley bearing portions 15 is not particularly limited as long as the rotation shaft of the driven pulley 13 can be received rotatably. In the present embodiment, the pair of driven pulley bearing portions 15 are provided on the frame 11 so as to extend outward in the predetermined direction A. That is, they are arranged in a state in which at least a part protrudes from the inside to the outside of the frame 11.

  Furthermore, in the present invention, it is necessary that at least one of the pair of driven pulley bearing portions 15 be open as an open bearing member. In the present embodiment, both of the driven pulley bearing portions 15 are required. Both are open bearing members. By providing a movable mechanism at a portion where the driven pulley bearing portion 15 of the frame 11 is attached, the driven pulley bearing portion 15 can be moved so as to rotate or tilt outward in the extending direction of the rotating shaft of the driven pulley 13. Therefore, the driven pulley 13 can be removed.

  The shape of the pair of driven pulley bearing portions 15 is not particularly limited, but in the present embodiment, a flat plate shape having a length in a one-dimensional direction is employed. As shown in FIGS. 1 and 2, a driven pulley bearing portion 15 is formed by extending a portion of the driven pulley mounting portion 51 to the outside of the frame 11, and the driven pulley mounting portion 51 is rotated or rotated as a fulcrum. It can be tilted.

  FIG. 3A is a plan view of a main part showing a state before the driven pulley bearing portion 15 is inclined in the conveyor shown in FIG. 1, and FIG. 3B is a view shown in FIG. It is a principal part top view which shows the state after inclining from a position. 3A corresponds to the state before the inclination of the driven pulley bearing portion 15 shown in FIG. 1, and FIG. 3B corresponds to the state when the driven pulley bearing portion 15 shown in FIG. 2 is inclined. Note that the driven pulley bearing shown in FIG. 3 (b) is shown in FIG. 3 (b), where the position in the state before the driven pulley bearing 15 is inclined (a state parallel to the predetermined direction A) is used as a reference position. The position where the part 15 is inclined is defined as an inclined position. FIG. 4 is a side view of a main part showing a state in which the driven pulley bearing portion 15 holds the rotating shaft 31 of the driven pulley 13 in the transport conveyor according to the present embodiment.

  As shown in FIGS. 3A, 3 </ b> B, and 4, the driven pulley mounting portion 51 is a fixing member 52 for fixing the driven pulley mounting portion 51 to the frame 11 and a main body of the driven pulley mounting portion 51. A plate-like driven pulley bearing 15 is provided. And the edge part which becomes the outer side seeing from the flame | frame 11 of the bearing part 15 for driven pulleys is the bearing end 15a. A shaft insertion hole 54 into which the rotation shaft 31 of the driven pulley 13 is inserted is formed in the bearing end 15a, whereby the rotation shafts 31 at both ends of the driven pulley 13 are respectively received by the shaft insertion holes 54, and the frame 11 It will be attached to the end of the.

  Here, as shown in FIGS. 3A and 3B, the bearing end 15a, which is one end of the driven pulley mounting portion 51, becomes the driven pulley bearing portion 15, and the other end (bearing). The end opposite to the end 15a is a free end 15b. The fixing member 52 fixes the driven pulley mounting portion 51 to the frame 11 at a position close to the free end 15 b side from the center of the driven pulley bearing portion 15. Further, as will be described later, the fixed member 52 is elastically attached to the driven pulley bearing portion 15 on the outer side in the extending direction of the rotating shaft 31 of the driven pulley 13 so as to be rotatable or inclined. Therefore, the driven pulley bearing portion 15 has the driven pulley mounting portion 51 as a fulcrum as shown in FIG. 3B from the reference position state (the state in which the driven pulley 13 is supported) shown in FIG. It is possible to tilt as.

  In this embodiment, as shown in FIGS. 3A and 3B, the driven pulley mounting portion 51 is fixed by the fixing member 52 on the inner surface of the frame 11, and therefore the bearing end 15 a of the fixing member 52. The driven pulley bearing portion 15 can be rotated or inclined with a position (frame contact position) where the driven pulley bearing portion 15 and the frame 11 are in contact with each other in the vicinity of the side as a fulcrum. Moreover, since the free end 15b abuts against the inner wall surface of the frame 11 at the reference position, the free end 15b cannot move to the outside of the frame 11. Therefore, the bearing end 15a opposite to the free end 15b, that is, the driven pulley bearing portion 15 does not move inside the frame 11 but moves only outside the frame 11, as shown in FIG.

  That is, the driven pulley bearing portion 15 is moved from the reference position shown in FIG. 3A to the inclined position shown in FIG. 3B by inclining so that the bearing end 15a is positioned outside the frame 11. It is possible. As a result, as shown in FIG. 2, the pair of driven pulley bearing portions 15 are inclined in the direction of arrow B in the figure, and the interval between the bearing ends 15 a facing each other is larger than the length of the driven pulley 13. .

  As a result, as shown in FIG. 2, the rotating shaft 31 of the driven pulley 13 comes out of the shaft insertion hole 54, and the driven pulley 13 can be removed from the pair of driven pulley bearing portions 15 (for example, the arrows in the figure). C direction). Thus, even if the belt 14 stretched between the drive pulley 12 and the driven pulley 13 is removed, the driven pulley 13 is supported by the driven pulley bearing portion 15. When it is desired to remove the driven pulley 13, the driven pulley 13 can be easily removed by inclining the driven pulley bearing portion 15, so that the situation where the driven pulley 13 is accidentally dropped can be avoided. As a result, the efficiency of maintenance work can be improved.

  In this embodiment, as shown in FIGS. 3A and 3B, the driven pulley bearing portion 15 is a part of the driven pulley bearing portion 15 and is basically plate-shaped. The driven pulley bearing portion 15 has a shape in which the vicinity of the center portion is cut and bent in order to provide a belt tension adjusting portion 17 to be described later. However, the shape of the driven pulley bearing portion 15 according to the present invention is not limited to this embodiment. That is, the shape of the driven pulley bearing portion 15 is only required to be able to rotate or tilt on the outside of the frame 11 by a movable mechanism. For example, the driven pulley bearing portion 15 has a length in a direction along the predetermined direction A. As long as the shaft insertion hole 54 is formed in the end portion, a plate shape, a rod shape, or other shapes may be used, and a general annular bearing (one-dimensional direction) may be used instead of a plate shape or a rod shape. Or a lump having no length).

Furthermore, in this embodiment, the driven pulley bearing portion 15 receives a repulsive force from the driven pulley mounting portion 51 on the outer side in the extending direction of the rotating shaft 31 of the driven pulley 13 with the driven pulley mounting portion 51 as a fulcrum. However, it is not limited to this, and depending on the type of movable mechanism, it is not configured to rotate or tilt around a fulcrum, but parallel to a predetermined direction. It may be configured to translate parallel to the outside of the frame 11 while maintaining the position (reference position).
[Configuration of fixing member and biasing member]
The specific configuration of the fixing member 52 is not particularly limited, but in this embodiment, a bolt-nut provided so as to be orthogonal to the longitudinal direction of the driven pulley bearing portion 15 is used. A coil spring 56 is sandwiched between the bolt and nut as an urging member. The bolt head is positioned outside the frame 11, and the bolt head, frame 11, driven pulley bearing 15, coil spring 56, washer and nut are inserted in this order into the bolt body. According to this configuration, since the driven pulley bearing portion 15 is pressed against the frame 11 by the biasing action of the coil spring 56 between the bolt and the nut, if no external force is applied, the driven pulley as shown in FIG. The bearing portion 15 is a reference position parallel to the predetermined direction A. On the other hand, if an external force is applied to the bearing end 15a toward the outside of the frame 11, as shown in FIG. 3B, the frame contact position of the driven pulley bearing portion 15 is set as a fulcrum as shown in FIG. As a result, the driven pulley bearing portion 15 is inclined. Thus, by providing the coil spring 56, the bearing end 15a of the driven pulley bearing portion 15 can always maintain the reference position shown in FIG. As long as no external force is applied, the driven pulley bearing portion 15 can be prevented from moving to the inclined position. As a result, it is possible to more effectively avoid a situation where the driven pulley 13 is accidentally dropped.

  Further, if the fixing member 52 is configured as described above, tightening of the bolt 11 between the bolt 11 and the frame 11 is also buffered by the coil spring 56. Therefore, the driven pulley bearing portion 15 can be rotated with the fixing member 52 as the rotation axis. At this time, as shown in FIG. 4, the upper side surface 15e on the free end 55 side of the driven pulley bearing portion 15 is in contact with the inner surface of the frame 11 (dotted line in the figure). Therefore, in rotation of the driven pulley bearing portion 15, the inner surface of the frame 11 functions as a stopper, and the bearing end 15 a of the driven pulley bearing portion 15 does not rotate to the lower surface side of the frame 11. Therefore, as will be described later, the fixing member 52 is a toggle that moves the driven pulley mounting portion 51 holding the driven pulley 13 from a horizontal state to the frame 11 to a state in which it is bent to the upper surface side of the conveyor. It functions as a part.

In the present invention, the specific configuration of the urging member is not limited to the coil spring 56, and the driven pulley bearing portion 15 is urged toward the outside in the extending direction of the rotating shaft 31 of the driven pulley 13. Any configuration can be used. If the biasing member is the coil spring 56, the fixing member 52 and the biasing member can be integrated, and the degree of biasing by the coil spring 56 can be adjusted by adjusting the tightening state of the bolt-nut. Can do. As a result, the reference position of the driven pulley bearing portion 15 can be more appropriately maintained.
[Belt tension adjustment part]
In the present invention, as shown in FIGS. 3A and 3B and FIG. 4, a screw shape as a belt tension adjusting portion that adjusts the tension state of the belt 14 supported by the driving pulley 12 and the driven pulley 13. More preferably, the member 17 is provided. The conveying conveyor is stretched by an external force applied from the inside to the outside of the belt 14 by the driving pulley 12 and the driven pulley 13, and as a result, the rotational driving force of the driving pulley 12 is transmitted to the belt 14. The driven pulley 13 also rotates with the rotation. Here, the driven pulley 13 not only functions to stretch the belt 14 but also has a function of adjusting the rotational state of the belt 14.

  The driving pulley 12 and the driven pulley 13 are opposed to each other in a positional relationship in which the longitudinal directions are parallel to each other. However, strictly speaking, the facing positions of the driving pulley 12 and the driven pulley 13 are not completely parallel to each other. The other may be in a slightly inclined state. When the belt 14 wound around the pulleys 12 and 13 rotates, depending on the contact state between the belt 14 and the pulleys 12 and 13, the rotation of the belt 14 may meander. In this case, meandering can be suppressed or prevented by finely adjusting the inclination angle (parallelism) of one of the pulleys 12 and 13 to the other. Usually, the object of adjusting the angle (parallelism) is the driven pulley 13 which is not connected to a drive source or the like and is mechanically simple. Therefore, in the present embodiment, by providing the belt tension adjusting portion 17, the position of the rotary shaft 31 inserted in the driven pulley bearing portion 15 is pushed out or retracted along the rotational direction A independently of each other. Is possible. As a result, the inclination angle of the driven pulley 13 with respect to the drive pulley 12 can be finely adjusted to adjust to a stretched state suitable for the rotation of the belt 14, so that meandering rotation of the belt 14 can be avoided or prevented.

  Although the specific configuration of the belt tension adjusting portion is not particularly limited, in this embodiment, as shown in FIGS. 3A and 3B and FIG. 4, it is integrated with the driven pulley bearing portion 15. The screw-shaped member 17 can be mentioned. The screw-like member 17 supports at least a cylindrical contact portion 71 that contacts the rotation shaft 31 of the driven pulley 13, a knob 72 integrated with the contact portion 71, and the contact portion 71 and the knob 72. And a screw main body portion 73 to be made.

  The tip end side of the contact portion 71 is flat so as to contact the rotating shaft 31 as described above. A disc-shaped knob 72 having a larger diameter than the contact portion 71 is integrally provided on the rear end side of the contact portion 71, and a screw main body portion 73 that is a male screw is inserted. A female screw hole (not shown) is formed. A screw-like member fixing plate 15c is formed at the central portion of the driven pulley bearing portion 15 so that the central portion is cut and bent inside the frame 11 so as to be perpendicular to the extending direction of the driven pulley bearing portion 15. Has been. The rear end side of the screw main body 73 is fixed by the flat screw-like member fixing plate 15c so as to be parallel to the driven pulley bearing portion 15. The tip end side (male screw) of the screw main body 73 is screwed into the female screw hole of the contact portion 71. Further, by forming the screw-like member fixing plate 15c, a window portion 15d that is a gap for projecting the outer periphery of the knob 72 to the outside of the frame 11 is formed in the central portion of the driven pulley bearing portion 15. With this configuration, when the knob 72 is rotated from the outside of the frame 11, the contact portion 71 is pushed out or pulled in along the extending direction of the driven pulley bearing portion 15 (that is, the predetermined direction A).

  Here, the shaft insertion hole 54 formed in the driven pulley bearing portion 15 has a “laterally long” shape having a length in a direction along the predetermined direction A, as shown in FIG. 4. Thereby, the position of the rotating shaft 31 inserted into the shaft insertion hole 54 can be adjusted in the predetermined direction A. The driven pulley 13 is urged toward the inside of the frame 11 by the winding of the belt 14, and the abutting portion 71 abuts on the rotating shaft 31, thereby causing the rotating shaft 31 to move toward the outside of the frame 11. Extruding. Therefore, the position of the rotary shaft 31 can be adjusted by the balance between the urging of the belt 14 toward the inside of the frame 11 and the pushing of the screw-like member 17 toward the outside of the frame 11. Therefore, the inclination angle of the driven pulley 13 with respect to the drive pulley 12 can be changed by changing the position of the rotating shaft 31 due to the contact of the contact portion 71 by the rotation of the knob 72. If it is this structure, since it is simple and can be integrated with the driven pulley attachment part 51, it is possible to make the whole structure compact.

  The screw-shaped member 17 is not limited to the above-described configuration, and the contact portion 71, the knob 72, and the screw main body 73 are all integrated, and the screw main body that is a male screw on the screw-shaped member fixing plate 15c. A female screw hole into which the portion 73 is screwed may be formed. If only the contact portion 71 and the knob 72 are integrated, the contact portion 71 and the knob 72 move along the screw body portion 73 fixed to the driven pulley bearing portion 15. 71, the knob 72, and the screw main body 73 are integrated, the screw-like member 17 itself moves in the extending direction of the driven pulley bearing portion 15 by screwing with the screw-like member fixing plate 15c. become.

In the present embodiment, as shown in FIG. 4, a part of the rotating shaft 31 of the driven pulley 13 is notched and opposed, and a parallel surface parallel to the shaft center is formed, and a shaft insertion hole is formed. 54 is more preferably a rectangular hole having a width corresponding to the parallel plane (long hole hole). According to this configuration, since the parallel surface of the rotation shaft 31 and the parallel part of the shaft insertion hole 54 are inserted correspondingly, and the end of the hole is not semicircular but rectangular, The rotating shaft 31 supported by the driven pulley bearing portion 15 is not inadvertently displaced. As a result, it is possible to more reliably avoid or prevent the driven pulley 13 from falling.
[Configuration for bending the vicinity of the driven pulley]
It is more preferable that the conveyor according to the present invention further includes a configuration that facilitates attachment / detachment of the belt 14. Specifically, for example, a configuration in which the vicinity of the driven pulley 13 is bent or rotationally moved with respect to the spreading surface of the frame 11, that is, the direction intersecting the predetermined direction A can be mentioned. FIG. 5 is a side view showing an example of a movable part that can bend (rotate) the driven pulley mounting part 51 holding the driven pulley 13 to the upper surface side of the transfer conveyor in the transfer conveyor according to the present embodiment. It is.

  In this embodiment, as described above, by providing the fixed member 52 of the driven pulley bearing portion 15 with the coil spring 56 that is an urging member, the driven pulley bearing portion 15 can rotate around the fixed member 52. Further, the upper side surface of the driven pulley bearing portion 15 in the vicinity of the free end 55 is in contact with the inner surface of the frame 11. Therefore, as shown in FIG. 5, the driven pulley bearing portion 15 can move between a position that is horizontal with respect to the frame 11 and a position that is bent toward the upper surface side of the frame 11 (in the direction of arrow D in the figure). ing. Therefore, in this embodiment, the fixing member 52 and the coil spring 56 function as the toggle portion 57.

  According to this configuration, with the driven pulley 13 attached, the driven end 15a of the driven pulley bearing portion 15 is pushed up to the upper surface of the frame 11 with the fixed member 52 as a fulcrum, so that the driven pulley mounting portion 51 is Can be folded. In other words, the driven pulley mounting portion 51 can be rotated and moved to the upper surface side of the frame 11 around the fixed member 52 while maintaining the state where the driven pulley 13 is supported by the driven pulley bearing portion 15. As a result, the distance between the driving pulley 12 and the driven pulley 13 is narrowed, so that the belt 14 stretched between the pulleys 12 and 13 is loosened. As a result, the belt 14 can be easily moved from the side of the frame 11. Can be removed. Similarly, when the removed belt 14 is attached, the driven pulley attaching portion 51 and the driven pulley 13 may be bent and the belt 14 may be fitted from the side of the frame 11. After the fitting, the driven pulley mounting portion 51 can be returned to the initial state of being stretched by the driving pulley 12 and the driven pulley 13 only by returning the driven pulley mounting portion 51 to the horizontal position on the frame 11.

  In particular, in the present embodiment, the toggle portion 57 is integrated with the fixing member 52, so that “the mechanism that controls the rotation or inclination of the driven pulley bearing portion 15” and “the driven pulley mounting portion 51 is bent or rotated. "Mechanism to be managed" is grouped as a single mechanism. Therefore, the configuration of the driven pulley mounting portion 51 can be further simplified and made compact.

  Further, as described above, the fixing member 52 is urged from the inside of the frame 11 to the outside by the coil spring 56. In other words, the state in which the driven pulley 13 is attached by the driven pulley bearing portion 15 is held by the coil spring 56 regardless of whether the driven pulley attaching portion 51 is in the horizontal position or the bent position. Therefore, the driven pulley mounting portion 51 can be bent while maintaining the mounting state of the driven pulley 13 adjusted to a suitable position (a position where no meandering occurs when the belt 14 rotates) by the belt tension adjusting portion 17. Therefore, it is not necessary to adjust the stretch state of the belt 14 every time the belt 14 is attached and detached, and as a result, the efficiency of work such as maintenance can be further improved.

  Moreover, even when the driven pulley 13 is removed from the driven pulley mounting portion 51, the reference position of the driven pulley bearing portion 15 is easily recovered by the coil spring 56. As shown in FIGS. 3A and 3B, the belt tension adjusting portion 17 is integrated with the driven pulley mounting portion 51. Therefore, when the driven pulley bearing portion 15 is restored to the reference position, the belt tension adjusting portion. The adjusted position of the driven pulley 13 by 17 is also restored. Therefore, with the configuration of the present embodiment, as described above, it is not necessary to adjust the rotational state of the belt 14 every time the driven pulley 13 is attached or detached.

  Further, the toggle portion 57 can make the bending torque (rotational movement torque) substantially constant by the biasing action of the coil spring 56. Therefore, it is not necessary to adjust the tension state of the belt 14 by the belt tension adjusting unit 17 every time the driven pulley 13 is bent. That is, in the present embodiment, the driven pulley bearing portion 15, the driven pulley mounting portion 51, the belt tension adjusting portion 17, and the toggle portion 57 are substantially integrated. Although the configuration itself is made compact, when the coil spring 56 is not provided, when the vicinity of the driven pulley 13 is bent, the external force when the toggle portion 57 is operated (folded) is moved to the driven pulley bearing portion 15. The insertion state of the rotary shaft 31 is easily shifted. Accordingly, the position of the driven pulley 13 adjusted by the belt tension adjusting unit 17 is likely to be shifted.

  In such a situation, when the belt 14 is removed or the driven pulley 13 is removed by bending the driven pulley attachment portion 51, the positional deviation of the driven pulley 13 due to the bending or removal is corrected when the belt 14 is subsequently attached. Therefore, adjustment work by the belt tension adjusting unit 17 is required. When the frequency of removing the belt 14 or the driven pulley 13 is low due to maintenance or the like, it may not be so complicated. However, as the frequency of removing each member increases, the belt tension adjusting unit 17 increases the frequency of removal each time. Performing the adjustment work increases the complexity. On the other hand, if the coil spring 56 is provided, the shift | offset | difference of the said insertion state can be avoided substantially. Therefore, when the operation of removing the belt 14 and the driven pulley 13 is performed, even a different operator can stabilize the bending torque, so that a situation in which the force applied at the time of bending is fluctuated due to the difference in the operator is avoided. be able to. As a result, since the frequency of adjusting the stretched state of the belt 14 can be minimized, the efficiency of work such as maintenance can be further improved.

In the present embodiment, the movable portion (toggle portion 57) is configured to be able to bend or rotate the driven pulley attachment portion 51 on the upper surface of the frame 11, but the present invention is limited to this. Any configuration may be used as long as the driven pulley mounting portion 51 can be rotationally moved in a direction intersecting the predetermined direction A. That is, a toggle mechanism that bends the driven pulley attachment portion 51 on the lower surface of the frame 11 may be employed, or a bending mechanism or a movable mechanism other than the toggle mechanism may be employed.
[Configuration to prevent the drive pulley from dropping]
In addition, it is more preferable that the conveyor according to the present invention has a configuration that prevents the drive pulley 12 from dropping from the frame 11. Specifically, a configuration in which the drive pulley 12 is not easily dropped in the drive pulley bearing portion 16 that rotatably attaches the drive pulley 12 to the end portion of the frame 11 may be employed. FIGS. 6A and 6B are main part side views showing an example of a return part provided in the drive pulley bearing part 16 in the transport conveyor according to the present embodiment.

  For example, as shown in FIG. 6A, in the present embodiment, the drive pulley side end of the frame 11 is provided so as to face each other in the extending direction of the rotation axis of the drive pulley 12, and the drive pulley 12 A pair of drive pulley bearings 16 that support the rotation shaft is provided, and a bearing groove 61 that receives the rotation shaft of the drive pulley 12 is formed in the drive pulley bearing 16. More specifically, as shown in FIG. 6A, the drive pulley bearing portion 16 is integrated with the side surface of the frame 11 and is provided to extend outward from the frame 11. The groove 61 opens to the outside of the frame 11 and is formed along the extending direction of the drive pulley bearing portion 16. In other words, the driving pulley bearing portion 16 composed of two arms extends outward from the side surface of the frame 11, and the bearing groove 61 is formed between the pair of arms.

  The bearing groove 61 is closed at the inner end of the frame 11, while the opening is formed at the outer end of the frame 11 for fitting the rotary shaft 21 into the groove. Then, on one side of the groove inner surface in the vicinity of the opening (the lower side in the drawing in the present embodiment), a return portion 62 is provided that protrudes from the groove inner surface so as to narrow the width of the bearing groove 61. .

  In the configuration shown in FIG. 6A, a hole is formed by hitting the groove inner surface side of the lower arm of the pair of arms forming the bearing groove 61 with a punch for punching, and a circle corresponding to the shape of the hole. The return portion 62 is formed by forming an arcuate convex shape on the inner surface of the groove. Alternatively, in the configuration shown in FIG. 6B, when the bearing groove 61 is formed, the return portion 62 is formed by forming a convex shape with a sharp tip on the groove inner surface side of the lower arm of the pair of arms. doing. Since the return portion 62 having such a configuration functions as a stopper that restricts the movement of the rotary shaft 21 in the bearing groove 61, the rotary shaft 21 fitted in the groove is prevented from falling off the bearing groove 61. As a result, the drop of the drive pulley 12 from the frame 11 can be effectively avoided.

  The return portion 62 may be formed at a position where the rotary shaft 21 is held in a state where the rotary shaft 21 is fitted in the bearing groove 61. The return portion 62 is a rotation fitted in the groove. There is no need to contact the outer surface of the shaft 21. As described above, the driving pulley 12 and the driven pulley 13 stretch the belt 14. In other words, the driving pulley 12 (and the driven pulley 13) receives an external force applied to the inside of the frame 11 by the belt 14. Will be. Therefore, even if there is a gap between the position of the return portion 62 and the outer surface of the received rotating shaft 21, the rotating shaft 21 is always the end where the bearing groove 61 is blocked when the belt 14 is wound. It will contact the part. Therefore, the return portion 62 may not be in contact with the outer surface of the received rotating shaft 21, and there may be a margin between the outer surface and the return portion 62.

Further, the height of the return portion 62, that is, the degree of protrusion from the inner surface of the bearing groove 61 is not particularly limited, and conditions such as the width of the bearing groove 61 or the diameter, shape, and material of the rotating shaft 21 ( It is possible to set an appropriate height according to bearing conditions. If the height of the return portion 62 is too large, the rotary shaft 21 cannot be fitted into the bearing groove 61 from the opening. On the other hand, if the height of the return portion 62 is too small, the return portion 62 cannot function effectively. It becomes impossible to prevent the rotary shaft 21 from falling off. However, since insertion and removal of the rotating shaft 21 differ depending on the bearing conditions, an appropriate height may be set as appropriate according to the bearing conditions. The same applies to the shape of the return portion 62, and an appropriate shape may be selected in consideration of ease of insertion and difficulty of dropping according to the bearing conditions.
[Embodiment 2]
The transport conveyor according to the present invention can be used in various fields. As a particularly preferable field, a weighing device including the transport conveyor according to the present invention as a weighing table for an article to be weighed can be cited. As a more specific example, it can be suitably used as a weighing conveyor device provided in a weight sorter that sorts and sorts articles by weight. The weighing conveyor device measures the weight of the article to be weighed while conveying the article to be weighed at a constant speed. As a typical example, the article is placed on the surface of the belt and is weighed by the belt. The structure provided with the weighing | measuring conveyor part which conveys articles | goods, and the weighing | measuring sensor part which detects the load of a to-be-measured article with the said weighing conveyor part is mentioned.

  FIG. 7 is a schematic diagram illustrating a schematic configuration of a main part of a weighing conveyor device including the transport conveyor according to the present embodiment as a weighing conveyor unit and a weight sorter including the weighing conveyor device. The weighing conveyor device 90 includes a weighing conveyor unit (conveyance conveyor) 91 and a weighing sensor unit 92, and the article to be weighed 10 is carried into the weighing conveyor device 90 on the upstream side in the conveyance direction B of the weighing conveyor device 90. A sorting conveyor 94 is provided on the downstream side in the transport direction B, and a sorting conveyor 94 that unloads the articles 10 weighed by the weighing conveyor device 90 and sorts them by weight. Each conveyor is rotationally driven by a drive source such as a motor (not shown), and is controlled so as to be interlocked as a weight sorter by a control device (not shown). The specific configurations of the carry-in conveyor 93, the sorting conveyor 94, and other weight sorters are not particularly limited, and various configurations known in the technical field of weight sorters can be appropriately selected and adopted. it can.

  In the above weight sorter, for example, when the article to be weighed 10 is food, the weighing conveyor 91 needs to be cleaned and disinfected in accordance with the hygiene management according to the type of food in accordance with the food hygiene management standards. It becomes. A representative example of the hygiene management standard is HACCP (Hazard Analysis and Critical Control Point, Hasap or Hasep), which is an international standard for food hygiene management systems. At this time, it is necessary to remove the belt or the belt and the driven pulley. However, with the configuration according to the present invention, it is possible to avoid a situation in which the driven pulley is accidentally dropped even when the belt is removed. At the same time, both the belt and the driven pulley can be easily removed, and even when the belt and the driven pulley are attached, it is not necessary to adjust the belt tension state every time. As a result, it is possible to stabilize the conveyance and weighing state of the article 10 to be weighed in the weighing conveyor device 90, effectively avoiding a decrease in weighing and sorting accuracy, and exhibit an excellent weight sorting capability. In addition, the overall efficiency of maintenance work such as cleaning and disinfection can be further improved.

As shown in FIGS. 1, 2, and 5, in the conveyor according to the present embodiment, the conveyor mounting member 18 is provided on the side surface of the frame 11 (in the drawing, the position from the center of the frame 11 to the driven pulley 13 side). It is preferable to provide. The conveyor attachment member 18 can easily attach and detach the transfer conveyor (the weighing conveyor portion 91 in the configuration shown in FIG. 7) to the weight sorter body. The specific configuration of the conveyor mounting member 18 is not particularly limited, but a known mounting member such as a so-called patchon lock (a bracket-type lock that is tightened after being latched using a lever action) is preferably used. be able to. If it is a patch and lock, since the conveyance conveyor can be attached to or detached from the weight sorter main body with one touch, the efficiency of the maintenance work of the conveyance conveyor can be further improved.
[Modifications of the present invention]
As described above, the present invention is preferably a driven pulley in a transport conveyor in which a drive pulley and a driven pulley are attached to a frame of a transport conveyor, a belt is wound around these, and the belt is stretched by a belt tensioning mechanism. The driven pulley mounting member opens to the outside of the frame after a spring is put on the fulcrum of a driven pulley mounting member (in this embodiment, a pair of driven pulley bearing portions 15) that attaches to the frame. With this structure, the driven pulley can be stably attached without falling even if the belt is removed, and the driven pulley can be easily removed. In addition, if the driven pulley mounting member can be bent, the force applied during bending can be made constant by inserting a spring, so the belt tensioning mechanism can be adjusted when disassembling and assembling the conveyor. There is no need to do it. Further, in the above conveyor, a drive pulley mounting member (a pair of drive pulley bearing portions 16 in the present embodiment) for mounting the drive pulley is provided with a retaining member (return portion 62 in the present embodiment) for preventing the drop from the frame. As a result, not only the driven pulley but also the drive pulley can be avoided.

  In the present embodiment, as shown in FIG. 2, the pair of driven pulley bearing portions 15 are configured to be inclined so that the bearing end 15 a is positioned outside the frame 11. Is not limited to this, and at least one of the pair of driven pulley bearing portions 15 may be inclined. Moreover, although the inclination angle of both the driven pulley bearing portions 15 may be approximately the same, one of the inclination angles may be increased or decreased. That is, in the present invention, it is only necessary that the distance between the opposed bearing ends 15a is widened by the inclination of the driven pulley bearing portion 15 so that the driven pulley 13 can be removed from the mounted state.

  Further, the return portion 62 for preventing the drive pulley 12 from dropping as shown in FIGS. 6A and 6B is necessarily provided in combination with the driven pulley bearing portion 15 and the driven pulley mounting portion 51 according to this embodiment. It does not have to be. If necessary, only the driving pulley bearing portion 16 including the return portion 62 may be employed in the conveyor.

  Furthermore, the return portion 62 may be combined with the driven pulley bearing portion 15. That is, in the present embodiment, the driven pulley bearing portion 15 receives the rotating shaft 31 of the driven pulley 13 and, as shown in FIG. 4, a shaft insertion hole 54 that is a rectangular square hole at the bearing end 15a. However, instead of the shaft insertion hole 54, a groove similar to the bearing groove 61 and the return portion 62 shown in FIGS. 6A and 6B may be formed in the bearing end 15a. Considering the convenience of removing the driven pulley 13, it goes without saying that the configuration for receiving the rotary shaft 31 is not limited to the shaft insertion hole 54.

  It should be noted that the present invention is not limited to the description of the above-described embodiment, and various modifications are possible within the scope shown in the claims, and are disclosed in different embodiments and a plurality of modifications, respectively. Embodiments obtained by appropriately combining technical means are also included in the technical scope of the present invention.

  As described above, the present invention is useful as a mechanism for preventing a pulley from coming off a conveyor. Therefore, the present invention can be widely used in the field of transfer conveyors, and further, in fields where the reduction in the reproducibility of the transfer state of the transfer conveyor due to deformation of pulleys is affected, for example, weighing of weight sorters It can also be effectively used in the field of conveyor devices and the like.

It is a top view which shows the structure of the conveyance conveyor which concerns on one Embodiment of this invention. It is a top view which shows the state which removes a driven pulley in the conveyance conveyor shown in FIG. (A) is a principal part top view which shows the state before the bearing part for driven pulleys inclines in the conveyance conveyor shown in FIG. 1, (b) is the position which the bearing part for driven pulleys shows in (a). It is a principal part top view which shows the state after inclining from. FIG. 2 is a side view of a main part showing a state in which a driven pulley bearing portion holds a rotating shaft in the transport conveyor shown in FIG. 1. FIG. 3 is a side view showing an example of a movable part that can bend the driven pulley attachment part in a state where the driven pulley is supported and supported by the driven pulley bearing part to the upper surface side of the transfer conveyor in the transfer conveyor shown in FIG. 1. (A) and (b) are principal part side views which show an example of the return part provided in the bearing part for drive pulleys in the conveyance conveyor shown in FIG. It is a schematic diagram which shows schematic structure of the principal part of a weighing | measuring conveyor apparatus provided with the conveyance conveyor shown in FIG. 1 as a weighing conveyor part, and a weight sorter provided with the said measuring conveyor apparatus.

Explanation of symbols

11 Frame 12 Drive pulley 13 Drive pulley 14 Belt 15 Drive pulley bearing 16 Drive pulley bearing 17 Screw-like member (belt tension adjusting section)
31 Rotating shaft of driven pulley 51 Driven pulley mounting part (pulley mounting part)
54 Shaft insertion hole 56 Coil spring (biasing member)
57 Toggle part (movable part)
61 Bearing groove 62 Return section 90 Weighing conveyor device

Claims (3)

A driving pulley;
A driven pulley,
A frame having a shape extending in a predetermined direction, the drive pulley and the driven pulley being rotatably attached at both ends;
Wound across the drive pulley and the driven pulley, and an endless belt which is driven to rotate by the drive pulley,
The driven pulley side end of the frame is provided so as to face each other in the extending direction of the rotating shaft of the driven pulley, and includes a pair of bearing members that support the rotating shaft of the driven pulley.
A pulley mounting portion is provided at the driven pulley side end of the frame so as to extend toward the outside of the frame,
At least one of the pair of bearing members is an open bearing member that opens in the extending direction of the rotation shaft of the driven pulley,
The open bearing member is
While being provided on the frame in a state of extending outward in the predetermined direction,
With respect to the pulley mounting part, the pulley mounting part is attached so as to be able to rotate or tilt in a state of receiving a repulsive force on the outer side in the extending direction of the rotating shaft of the driven pulley.
By rotating or tilting outward in the extending direction of the rotating shaft of the driven pulley, the driven pulley is configured to open in the extending direction of the rotating shaft of the driven pulley,
By the opening motion bearing member is opened as described above, the driven pulley is present What Do removable from the frame, the transport conveyor. The aforementioned pulley mounting portion, the rotation or tilting of the stretching outward of the rotational axis of the driven pulley biasing member biasing the opening-bearing member in the opposite direction is provided, according to claim 1 Conveyor conveyor. A weighing device comprising the conveyor according to claim 1 or 2 as a weighing table for an object to be weighed.

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