JP5080994B2 - Combination weighing device - Google Patents

Description

  The present invention relates to a combination weighing device for weighing articles such as foods in order to wrap the articles by a predetermined amount, and combining the articles so as to become a predetermined amount, and discharging them to the packaging machine. The present invention relates to such a combination weighing device.

  5 and 6 are a front view and a plan view of the combination weighing device disclosed in Patent Document 1 below. This combination weighing device includes a tank 100 that receives an article W from an upper opening and supplies the article W from a rectangular frame-shaped lower opening. Below the tank 100, a channel 103 having a trough 101 for conveying received articles horizontally to the outside of the tank 100 and a plurality of hoppers 102 having a function of weighing articles supplied from the troughs 101. Is provided. A plurality of channels 103 are arranged along the long sides in such a direction that the conveying direction of each trough 101 is orthogonal to the long side of the lower opening of the tank 100 in the horizontal plane. The group 103 has a back-to-back arrangement in which articles are conveyed toward the outside of the tank 100 whose directions are opposite to each other.

According to this combination weighing device, the article W is stored in the tank 100 fixed to the frame of the device. The article exits from the lower opening of the tank 100 and falls onto the trough 101 of each channel 103, and the article W is conveyed by the vibration of the trough 101 and supplied to the hopper 102 of each channel 103. Then, the weight of the article W supplied by the hopper 102 is weighed, a combination within the target weight range is selected from the combinations of the articles W weighed by the plurality of channels 103, and the selected articles W are assembled. To be discharged into the packaging machine.

JP2004-109078

According to the conventional combination weighing apparatus as described above, since the article W falls from the tank 100 onto the trough 101, the article W is somewhat separated when transported to the hopper 102 by the trough 101 shown in FIG. Many articles were conveyed while being overlapped, and several articles were supplied to each hopper 102 equipped with a weighing function at the same time. In particular, when the article W overlaps with potato chips, it is difficult to separate them. FIG. 4B shows how the article W is conveyed. However, even in such a case, there is no problem as long as an amount having a certain weight is combined. Potato chips are sold in bags of about 60 g or 30 g, but there is no problem even if they are transported in an overlapping manner as long as this is a predetermined amount. Rather, in order to maintain a predetermined conveyance capacity (conveyance amount per unit time), it is often convenient for the article W to be somewhat agglomerated.

However, due to its good portability, prevention of quality deterioration after opening (so-called “burnt size”), provision to small children and the recent increase in health consciousness, demand to be sold in 15 to 25 g bags Has happened. In this case, when an article W close to 10 g is supplied from a trough to a hopper having a weighing function as in the conventional case, the article W of the hopper stays without being selected as a combination, and the weighing efficiency decreases. Will happen.

  Therefore, in order to solve the above-mentioned problems, the present invention provides a combination weighing device that can supply a small amount of articles (about two or three in terms of potato chips) to each hopper equipped with a weighing function to make a small amount of combination. It is intended to provide.

The combination weighing device according to claim 1 has a trough 1 for supplying an article W from an article supply tank 2 to a weighing hopper 3, and the trough has a first descending slope that allows the article to slide by its own weight. In the combination weighing device including the transfer surface 11 and the second transfer surface 12 extending in the horizontal direction from the lower end of the first transfer surface, and including the vibration mechanism 4 for vibrating the trough,
There is a third transport surface 13 extending from the first transport surface at an angle above the second transport surface, and from the upper end 13a of the third transport surface to the second transport surface. The falling article is separated from the following article, and the article on the third conveyance surface is conveyed at a lower speed by the vibration mechanism than the article on the second conveyance surface. It is characterized by that.

The combination weighing device according to claim 2 has a trough 1 for supplying the article W from the article supply tank 2 to the weighing hopper 3, and the trough has a first slope that allows the article to slide by its own weight. In the combination weighing device including the transfer surface 11 and the second transfer surface 12 extending in the horizontal direction from the lower end of the first transfer surface, and including the vibration mechanism 4 for vibrating the trough,
There is a third transport surface 13 extending at an angle from the second transport surface above the second transport surface, and from the upper end 13a of the third transport surface to the second transport surface. The falling article is separated from the following article, and the article on the third conveyance surface is conveyed at a lower speed by the vibration mechanism than the article on the second conveyance surface. It is characterized by

The combination weighing device according to claim 3 includes a trough 1 for supplying an article W from an article supply tank 2 to a weighing hopper 3, and the trough supplies the article from the tank and horizontally in a conveying direction. A vibration mechanism that includes a first conveying surface 11 that extends, and a second conveying surface 12 that supplies the article to the weighing hopper and extends further horizontally from the first conveying surface, and also vibrates the trough. In a combination weighing device with 4
There is a third transport surface 13 extending from the first transport surface at an angle above the second transport surface, and from the upper end 13a of the third transport surface to the second transport surface. The falling article is separated from the following article, and the article on the third conveyance surface is conveyed at a lower speed by the vibration mechanism than the article on the second conveyance surface. It is characterized by that.

The combination weighing device according to claim 4 is the combination weighing device according to any one of claims 1 to 3, wherein the length of the third conveyance surface in the conveyance direction is longer than the bulk of the article. It is characterized by that.

The combination weighing device according to claim 5 is the combination weighing device according to claim 4, wherein the length of the third conveyance surface in the conveyance direction is up to twice the bulk of the article. It is characterized by that.

The combination weighing device according to claim 6 is the combination weighing device according to any one of claims 1 to 5, wherein the vibration mechanism performs a linear reciprocating motion on a line extending obliquely upward with respect to the horizontal direction. The angle (θ2) of the line extending obliquely upward with respect to the horizontal direction is larger than the angle (θ1) of the third transport surface with respect to the horizontal plane.

A combination weighing device according to a seventh aspect is the combination weighing device according to any one of the first to sixth aspects, wherein the trough is replaceable according to the type of the article.

  According to the combination weighing device 10 described in claims 1 and 2, the trough 1 that supplies the articles W to the weighing hopper 3 is located above the second conveyance surface from the first or second conveyance surface 11, 12. Since it has the 3rd conveyance surface 13 which makes | forms the angle (theta) 1 and the upper edge part 13a of the 3rd conveyance surface is located higher than the bulk of the said article W from a horizontal surface, the articles | goods W are dropped one by one Furthermore, the article on the third conveyance surface 13 is conveyed at a low speed by the vibration mechanism 4 with respect to the article W on the second conveyance surface 12, so that one article W is obtained. It can be transported in a state of being pulled apart one by one.

  According to the combination weighing device 10 described in claims 3 and 4, the length of the third transport surface 13 of the trough 1 that supplies the article W to the weighing hopper 3 is longer than the bulk of the article W. The articles W can be more reliably dropped one by one from the upper end portion 13a of the transport surface. Here, since the length of the third transport surface is set to a length up to twice the bulk of the article, the articles W can be dropped efficiently one by one without reducing the production capacity as much as possible.

  According to the combination weighing device 10 described in claim 5, since the angle (θ1) of the vibration direction of the vibration mechanism 4 is larger than the angle (θ2) of the third conveyance surface of the trough 1, However, the article W can be transported.

An example of an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a side view schematically showing a combination weighing device 10 of this embodiment, FIG. 2 is a trough of this embodiment, and FIG. 3 is a perspective view schematically showing a trough of another embodiment. It is. FIG. 4A is a diagram illustrating a state in which the article W is conveyed in the trough of the present embodiment and the vibration mechanism 4.

  The combination weighing device 10 of the present embodiment weighs the articles W with the plurality of weighing hoppers 3 and selects a combination within the target weight range from the combinations of articles weighed with the weighing hoppers 3. It has a function of collecting articles and discharging them as articles W within a desired weight range.

  According to FIG. 1, it is necessary to supply a certain amount of articles W to the weighing hopper 3 in order to allow the articles W weighed by the weighing hoppers 3 to be combined in the target weight range. For this purpose, a trough 1 capable of supplying a predetermined amount of articles W to the weighing hopper 3 is installed above the weighing hopper 3.

  FIG. 2A shows the trough 1. The trough 1 has a first transport surface 11 that is inclined downward with respect to the transport direction. A tank 2 and a dispersion cone 5 are arranged above the trough 1 so as to supply the articles W to the first conveying surface 11 of the trough 1. The articles W supplied from the tank 2 are dispersed in the troughs 1 by the dispersion cones 5, slide on the first conveying surface 11 of the trough 1 and reach the lower end 13 b of the third conveying surface 13. A lower end portion 13 b of the third transport surface 13 is fixed to the first transport surface 11.

  The third transport surface 13 has an inclined surface that extends obliquely upward from the lower end portion 13b fixed to the first transport surface 11 with respect to the transport direction, and the upper end portion 13a is the second transport surface. 12 above.

  A vibration mechanism 4 is installed below the trough 1 to vibrate the trough 1 obliquely upward (arrow CD) with respect to the transport direction. Accordingly, the trough 1 also vibrates obliquely upward (arrow CD) with respect to the transport direction.

  FIG. 4A shows the structure of the vibration mechanism 4. The vibration mechanism 4 connects a trough base 18 installed on a base 17 via a coil spring 16, a pair of leaf springs 19 attached to the trough base 18, and upper ends of these leaf springs 19. A connecting member 20, a coil 15 attached to the trough base 18, and a balancer 21 attached to the trough base 18 are provided. The trough 1 is supported on the connecting member 20. According to the vibration mechanism 4, when the coil 15 is energized, a magnetic force is generated, attracts the connecting member 20, and the trough 1 is displaced inward (arrow D) while sinking downward. While being lifted, the trough 1 is displaced outward (arrow C), and the trough 1 is repeatedly vibrated in the CD direction shown in FIG. The article W on the trough 1 is conveyed to the weighing hopper 3 by this vibration.

Similarly, FIG. 4A shows the state of conveyance of the article W after the first conveyance surface 11 is slid from the tank 2 and reaches the lower end portion 13b of the third conveyance surface 13. At this time, the article W that has reached the lower end portion 13b slides with the first conveying surface 11 in an overlapping state, or slides from one to the next, so that it stays and overlaps. The overlapped articles W are transported by the vibration mechanism 4 in a state of being overlapped on the third transport surface. However, since the vibration by the vibration mechanism 4 is in an oblique direction, there is a vibration component in the upward direction, so that the overlapping articles W are conveyed at a low speed while being separated.

Further, if the vibration direction (CD direction) of the vibration mechanism 4 is an angle θ2 with respect to the horizontal direction, and the angle of the third inclined surface 13 is θ1, θ2 needs to be larger than θ1. There is. This is because the article W cannot smoothly move in the transport direction unless the vibration direction of the vibration mechanism 4 is obliquely upward with respect to the third inclined surface 13.

  When the article W is conveyed to the upper end portion 13a of the third conveyance surface, the article W is separated to the extent that the center of gravity of the other article W does not overlap the center of gravity of the article W. If it does so, the articles | goods W can fall to the 2nd conveyance surface 12 piece by piece from the upper end part 13a, and can be isolate | separated completely.

  Here, the length of the third transport surface 13 in the transport direction is preferably longer than the bulk of the article W (the size, height, volume, etc. of each article). This means that if there is a length corresponding to one article W, when the first conveying surface 11 is slid and reaches the lower end portion 13b of the third conveying surface 13, the upper end portion 13a is exceeded by the momentum. When the article W reaches the lower end portion 13b in a lump shape, the center of gravity of the article W is not overlapped by the vibration of the vibration mechanism 4 while being conveyed on the third conveyance surface 13. This is because they can be separated.

  The article W that has fallen on the second transport surface 12 is transported by the vibration mechanism 4, and the speed thereof is the second transport compared to the third transport surface 13 that is an inclined surface obliquely upward in the transport direction. Surface 12 is fast because it is horizontal. Therefore, the articles W dropped one by one from the upper end portion 13a are conveyed forward from the dropping point when the next article W falls and can be pulled apart. That is, it can be conveyed one by one.

  Here, the upper end portion 13a of the third transport surface is preferably higher in height from the second transport surface 12 than the bulk of the article W. When this is low, the article W straddles the second transport surface 12 and the upper end portion 13a and is difficult to be transported. That is, the article W that falls next cannot be pulled away, or may overlap and be transported on the second transport surface 12 again. For example, although the present invention is not limited, if the article W is potato chips, the bulk cannot be limited because it is indefinite, but if the height is determined so that it can be separated by limiting the longest bulk by experience. Good.

  Next, the second transport surface 12 needs to be horizontal. This is because when the article W is selected and discharged from the weighing hopper 3 arranged below the trough 1, a discharge command is output from the control unit (not shown) to the corresponding trough 1, and the trough 1 is caused by the vibration of the vibration mechanism 4. 1 is driven to convey the article W. That is, when the discharge command is not output, the second conveyance surface 12 is horizontal because it is not driven, so that it is possible to avoid the article W from being discharged to the weighing hopper 3 without permission.

  FIG. 2B shows an embodiment of the second trough 1. The difference from the first embodiment is whether the lower end portion 13a of the third transfer surface 13 is fixed to the first transfer surface 11 or to the second transfer surface 12, The state of conveyance of the article W is the same as in FIG. 4A, and the effect is also the same.

Further, as shown in FIG. 3, as another form of the trough 1, the trough 1 of the present invention described above includes the first conveying surface 11 that forms a downward slope that allows the article W to slide by its own weight. The one transport surface 11 may be a horizontal transport surface. That is, the trough having only the horizontal second conveyance surface 12 may be a trough having a third conveyance surface extending at an angle upward from the second conveyance surface 12. In this case, when the combination weighing device is initially driven, the vibration is transported by the vibration mechanism 4 on the horizontal transport surface, so that the lower end portion of the third transport surface 13 is lower than the first transport surface 11 having a downward slope. Although it takes time to transport to 13b and the trough transport efficiency, that is, the production capacity of the combination weighing device is reduced, the trough 1 including the first transport surface becomes the same transport efficiency after the lower end portion 13b.

Further, it is desirable that the width of the trough 1 is smaller than the bulk of the article W. This is because if the width of the trough 1 is larger than two of the bulk of the article W, the article W is transported side by side and simultaneously falls from the upper end portion 13a of the third transport surface to the second transport surface 12. Similarly, the articles W are transported side by side on the second transport surface 12 without being separated.

  As can be seen from the above description, since the size of the trough 1 varies depending on the type (particularly bulk) of the article W, it is preferable that the trough 1 be replaceable. In this case, the vibration mechanism 4 and the trough 1 are interchangeable. If a configuration (not shown) using a catch clip or the like that is easy to operate is used for the connecting member 20 with the connecting member 1, it is possible to save time and labor when replacing the trough 1.

As described above, a plurality of troughs 1 are arranged, but a pair of adjacent troughs 1 is formed with a gap for preventing the vibrating troughs 1 from interfering with each other. Although not shown, the gaps are closed by forming an overlap portion in which the side portion of one trough 1 is overlapped with the side portion of the other trough 1. Since each trough 1 vibrates, it is necessary to dispose it with a predetermined gap. Although there is a possibility that the article W falls from this gap, in this combination weighing device 10, the article W does not fall from the gap between the troughs 1 inserted in the tank 2 because the gap is covered by the overlap portion. .

  In the above description, the weighing hopper is installed below the trough 1. However, the structure is not limited to this, and the structure of a normal combination weighing device is a stock hopper that temporarily holds the article W below the trough 1. A weighing hopper for weighing articles W is installed below the stock hopper, and a memory hopper to be kept for selection as a combination is installed below the weighing hopper.

The side view of the combination weighing device concerning the present invention. (A) is a perspective view of the 1st trough. (B) is a perspective view of a 2nd trough. The perspective view of other troughs. (A) is a detailed view of a vibration mechanism and a state of conveying an article on a trough according to the present invention, and (b) is a state of conveying an article on a conventional trough. The side view of the conventional combination weighing device. The top view of the conventional combination weighing device. The perspective view of the conventional trough.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Trough 2 Tank 3 Weighing hopper 4 Vibrating mechanism 5 Dispersion cone 10 Combination weighing device 11 1st conveyance surface 12 2nd conveyance surface 13 3rd conveyance surface 13a Upper end part 13a of 3rd conveyance surface
13b Lower end 13b of the third transport surface
15 Coil 16 Coil Spring 17 Base 18 Trough Base 19 Leaf Spring 20 Connecting Member 21 Balancer W Article

Claims (7)

A trough (1) for supplying an article (W) from an article supply tank (2) to a weighing hopper (3), and the trough has a first conveying surface on which a downward slope is formed so that the article can slide by its own weight ( 11) and a second weighing surface (12) extending in the horizontal direction from the lower end of the first conveying surface, and further comprising a vibration mechanism (4) for vibrating the trough,
A third transport surface (13) extending at an angle from the first transport surface to above the second transport surface; and the second transport surface from an upper end (13a) of the third transport surface. The article falling on the transport surface is separated from the subsequent article, and the article on the third transport surface is slower than the article on the second transport surface by the vibration mechanism. A combination weighing device which is conveyed by A trough (1) for supplying an article W from an article supply tank (2) to a weighing hopper (3); the trough having a first conveying surface (11) having a downward slope that allows the article to slide by its own weight And a second weighing surface (12) extending in the horizontal direction from the lower end of the first conveying surface, and a combination weighing device comprising a vibration mechanism (4) for vibrating the trough,
A third transport surface (13) extending at an angle from the second transport surface to above the second transport surface; and the second transport surface from an upper end (13a) of the third transport surface. The article falling on the transport surface is separated from the subsequent article, and the article on the third transport surface is slower than the article on the second transport surface by the vibration mechanism. A combination weighing device which is conveyed by A trough (1) for supplying an article (W) from an article supply tank (2) to a weighing hopper (3); the trough supplies the article from the tank and extends horizontally in a conveying direction; A vibration mechanism that includes a conveyance surface (11) and a second conveyance surface (12) that supplies the article to the weighing hopper and extends further horizontally from the first conveyance surface, and vibrates the trough. (4) In the combination weighing device provided with (4), it has a 3rd conveyance surface (13) extended at an angle from the 1st conveyance surface above the 2nd conveyance surface, and the 3rd conveyance surface The article falling on the second conveyance surface from the upper end (13a) is separated from the subsequent article, and the third conveyance is performed with respect to the article on the second conveyance surface. The article on the surface is conveyed at a low speed by the vibration mechanism. Combination weighing device.   4. The combination weighing device according to claim 1, wherein a length of the third conveyance surface in the conveyance direction is longer than a bulk of the article. 5.   The combination weighing device according to claim 4, wherein the length of the third conveyance surface in the conveyance direction is up to twice the bulk of the article.   The vibration mechanism reciprocates linearly on a line extending obliquely upward with respect to the horizontal direction, and an angle (θ2) of the line extending obliquely upward with respect to the horizontal direction is relative to a horizontal plane of the third transport surface. The combination weighing device according to any one of claims 1 to 5, wherein the combination weighing device is larger than the angle (θ1). The combination weighing device according to any one of claims 1 to 6, wherein the trough is replaceable according to a type of the article.

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