JPH0428032Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a combination weighing device.

In general, a combination weighing device performs a combination calculation based on each weight value obtained by supplying the object to be weighed to multiple automatic weighing machines and determining whether it is equal to a set weight or not.
Alternatively, a combination of weights closest to that within an allowable range is obtained, and objects to be weighed corresponding to the combination are discharged. As shown in FIG. 1, the conventional combination weighing device has a conical dispersion table 2 on a chute 1 of the main body of the weighing device, and troughs 3 are arranged radially around the outer periphery of the dispersion table 2. A pool hopper 4 and a corresponding weighing hopper 5 are arranged annularly in the lower part along the circumferential direction of the chute 1, and the opening/closing lids 4a, 5 of these hoppers 4, 5
A hopper opening/closing part 6 for opening and closing the hoppers a and 5b by a lever mechanism (not shown) is installed corresponding to both the hoppers 4 and 5 arranged in an annular manner. For this reason, the outer periphery of the weighing device main body becomes larger by the installation space of the hopper opening/closing section 6, resulting in a drawback that the installation volume becomes excessive. In addition, both hoppers 4 and 5
It is necessary to clean the hopper opening/closing part 6 around the outer periphery of the hopper opening/closing part 6, which must be removed each time cleaning is required. Cleaning work required a lot of effort.

This idea was made in view of the above-mentioned drawbacks of the conventional hoppers, and a plurality of hopper opening/closing units for opening and closing the hoppers are installed in a previously unused space surrounded by a plurality of circularly arranged hoppers. are removably arranged in correspondence with each hopper.

This invention will be explained below based on illustrated embodiments.

In FIG. 2, reference numeral 11 denotes a chute that is double-structured inside and outside 12 and outside 13, 14 is a dispersion table that is mounted and supported on an electromagnetic vibration device (not shown) and vibrates in a spiral reciprocating manner, and 15 is a chute of the dispersion table 14. A large number of them are arranged radially below the outer periphery in a non-contact manner, and are also mounted and supported on the electromagnetic vibration device.
A trough for vibrationally transferring the object to be weighed, 16 is a trough 1
A number of pool hoppers 5 are located at the lower end of the chute 11 and arranged at predetermined intervals along the circumferential direction of the chute 11, and a weighing hopper 17 is attached to the weight detector 18 at a position below each pool hopper 16. It is. Each pool hopper 16 has an opening/closing lid 19a that opens inward, and each weighing hopper 17 has an opening/closing lid 19b that opens inward to discharge the object to be weighed into the inner chute 12, and an opening/closing lid 19b that opens inward to discharge the object to be weighed into the outer chute. Opening/closing lid 1 to discharge to 13
9c. 20 is pool hopper 16
and a weighing hopper 17, the opening/closing lids 19a, 19b, 1
This is a hopper opening/closing unit that opens and closes 9c, and both hoppers 16 and 1
Utilizing the space surrounded by 7 and existing on the chute 11, they are arranged radially and removably within the space as shown in FIG. 21 is a pedestal that supports the drive unit 20.

4 to 6 show specific examples of the structure of the drive unit 20. FIG. In the following description, the side of the hopper opening/closing unit 20 facing both the hoppers 16 and 17 is referred to as the front, and the opposite side is referred to as the rear. The hopper opening/closing unit 20 includes an opening/closing lid 19 of the pool hopper 16.
The opening/closing mechanism part A corresponding to the opening/closing mechanism part A corresponding to the opening/closing mechanism part B, C corresponding to the opening/closing lid 19b, 19c of the weighing hopper 17 is arranged at predetermined intervals in a vertically elongated case 22 that is slightly tapered toward the rear end. The motor 24 is installed on the lower surface of the case 22 via a horizontal motor mounting plate 25, and is installed between the plates 23 sequentially from above. 26 is a drive gear fixed to a drive shaft 27 protruding from the lower part of the case 22, and 28 is a driven gear 29 that meshes with the drive gear 26, fixed to the lower end thereof and rotatably connected to each mounting plate 23 via a bearing 30. The supported transmission shaft 31 is a camshaft located closer to the front inside the case 22 than the transmission shaft 28 and supported by each assembly plate 23 via a bearing material 32, and both shafts 28 and 31 are arranged in parallel. It passes through each opening/closing mechanism section A, B, and C in the vertical direction.

Each of the opening/closing mechanisms A, B, and C has the same structure, and in each of them, a transmission gear 33 is pivotally connected to a transmission shaft 28 via a bearing 34, and a clutch plate 36 of a clutch 35 is located below the transmission gear 33. The shaft 28 and the gear 33 are configured to be fixedly fixed so that the shaft 28 and the gear 33 are interlocked when the clutch 35 is connected. On the other hand, a driven gear 38 that meshes with the transmission gear 33 and has an eccentric, substantially disc-shaped cam 37 fixed to its upper surface is pivotally connected to the camshaft 31 via a bearing 39, and a cylindrical brake 40 is provided below the driven gear 38. When the rotation of the gear 38 is stopped by the operation of the brake 40, the corresponding clutch 35 of the transmission shaft 28 is disengaged. 41 is cam 3
7, the lever is movable in the front and back direction of the hopper opening/closing unit 20, and is equipped with a roller 42 on the lower center surface that comes into contact with the circumferential side of the cam 37, and a push rod 43 with one end bent in a substantially dogleg shape fixed to this. At the same time, the other end side is slidably fitted into a guide frame 44 having a substantially inward U-shaped longitudinal section, and is further rotatably attached to a midway portion of the other end side via a pivot pin 45. The case 22 is biased toward the rear side by a coil spring 48 whose both ends are locked by a tabular spring receiver 46 and an L-shaped spring receiver 47 fixed to the rear side of the case 22 on the upper assembly plate 23. . The push rod 43 has protrusions 49a on both sides of the support frame 49, which is generally U-shaped in top view and is attached to the side of the case 22 opposite to the guide frame 44.
It is inserted through through holes 50a, 50b of 49b and is slidably supported, the front end side protrudes outside the case 22, and a vertical pressing plate 51 is fixed to the protruding end portion. Of the push rods 43, the rod 43a belonging to the opening/closing mechanism A has a longer outwardly protruding portion than the rods 43b and 43c belonging to the other opening/closing mechanisms B and C, and the pressing plate 51a of the rod 43a is approximately trapezoidal and tilts forward. protrudes upward, while the rods 43b, 4
The pressing plates 51b and 51c of 3c are both substantially triangular in shape and are configured to protrude downward. 52 is a photo coupler that detects the slit of the slit cam 54 supported by a pin 53 protruding from the lower surface of the gear 38, and outputs an activation signal for the brake 40 when the push rod 43 is in a protruding position in conjunction with the cam 37. It has the function of sending out messages. Here, the vertical wall (not shown) of the pedestal 21 has a through hole into which each hopper opening/closing unit 20 is inserted, and each hopper opening/closing unit 20 is inserted through this through hole toward the center of the pedestal 21. It is designed to be installed on a pedestal 21. Further, reference numeral 55 denotes attachment/detachment means provided on both sides of the front side of the opening/closing mechanism part B, and when the knob 56 is rotated, the engagement arm 58 screwed onto the rear end of the support shaft 57 is rotated approximately 90 degrees. The engaging arm 58 is press-fitted into the vertical wall portion of the through hole provided in the pedestal 21, and each hopper opening/closing unit 20 is attached to the pedestal 21. When removing each hopper opening/closing unit 20 from the pedestal 21, the knob 56 is rotated in the opposite direction to the above to release the engagement arm 58 from the vertical wall and remove each hopper opening/closing unit 20. can be removed from the pedestal 21. 59 is a stopper that prevents the engagement arm 58 from rotating more than necessary. In addition, 60 is a substantially rectangular rod cover arranged on the front surface of the case 22, and 61 is the case 2 at the opening/closing mechanism section A position.
2 flat plates arranged on the front and side surfaces for attaching required wiring and display; 63 a vertical reinforcing frame with both ends fixed to the mounting plates 23 and 25 on both sides of the case 22; 64 the rear surface of the case 22; 65 and 66 are oil guides for the clutch 35 and brake 40, respectively, so that the oil supplied to other parts flows to the clutch 3.
5 and the brake 40. 6
7 is a gear head of the motor 24, and 68 and 69 are holding plates for bearings 30 and 34, respectively.

When the hopper opening/closing unit 20 having the above-mentioned configuration is arranged and fixed on the pedestal 21 as shown in FIG. shall be. In this case, gear 33,
38 does not rotate and therefore cam 37 does not drive.
However, the pool hopper 16 and the weighing hopper 1
When opening any of the opening/closing lids 19a, 19b, and 19c of No. 7 to discharge the weighed object downward, when the clutch 35 is actuated by a predetermined signal and the shaft 28 and gear 33 are interlocked, the corresponding gear 38 is rotated. According to the movement of the cam 37, the lever 41 slides forward against the biasing force of the spring 48, and the push rod 43 is accordingly moved.
As shown in FIG. 7, the pressing plates 51a, 51b, and 51 press required ends of drive arms 70a, 70b, and 70, which project forward in the direction of the arrow and are connected to the opening/closing lids 19a, 19b, and 19c, respectively, so that the opening/closing lids 1
A required one of 9a, 19b, and 19c is opened. At this time, the protruding state of the push rod 43 is detected via the photocoupler 52, and the brake 40 is actuated in response to the signal to stop the rotation of the gear 38 for a predetermined time required for ejecting the object to be weighed, and at the same time, the clutch 35 is also released. state. Subsequently, after a predetermined period of time has elapsed, the brake 40 is activated based on a predetermined signal.
is released, the clutch 35 becomes connected, and the cam 37 rotates to its original position (see Figure 4).
As the lever 41 returns to the position shown in FIG. However, as soon as the return of the lever is completed, the clutch 35 becomes separated, and the gears 33, 38
rotation stops.

In the above embodiment, opening/closing lids 19b and 19c are provided on both sides of the weighing hopper 17 in order to improve the weighing speed, and the object to be weighed is selectively discharged to one side of the inner chute 12 and the outer chute 13. However, this invention is equally applicable to a configuration using a weighing hopper having an opening/closing lid on only one side. Of course, in this case, the hopper opening/closing unit incorporates two opening/closing mechanisms.

Further, in the above embodiment, each of the hopper opening/closing units is provided with a motor 24 as a drive source, but it may be configured such that a driving source such as a motor is common to a plurality or all of the hopper opening/closing units 20. As shown in Fig. 8, a drive shaft 71 rotated by an appropriate drive source is disposed in a central space surrounded by hopper opening/closing units 20 arranged radially, and a large diameter gear 7 is attached to this shaft 71.
2 is attached to mesh with the driven gear 29 of the transmission shaft 28 of each hopper opening/closing unit 20, and the driving force of all hopper opening/closing units 20 is transferred to the drive shaft 7.
Various modifications can be made to the structure obtained from 1.

As described above, the combination weighing device of this invention is provided with a pedestal in the center of a space surrounded by a plurality of annularly arranged hoppers, and a plurality of hopper opening/closing units for opening and closing each of the hoppers on this pedestal.
Since it is arranged to correspond to each hopper and can be attached and detached in the radial direction of the pedestal, the space dedicated to the surrounding hopper opening/closing part in conventional weighing devices is no longer required, and the weighing device itself can be made smaller. This reduces production costs and requires a small installation space, making it economical.
In addition, by arranging the hopper opening/closing part inside the annular arrangement of both hoppers, the position of both hoppers is at the outermost periphery of the weighing device body, improving operability, for example, making it easier to clean both hoppers. be able to. Furthermore, since the hopper opening/closing part is made into a unit corresponding to each pair of pool hopper and weighing hopper and is detachable, it is easy to assemble and install and replace old and new products, and even if troubles such as malfunctions occur, the hopper There is no need to replace or repair the entire opening/closing part, and only that portion of the unit can be replaced or removed and repaired, and the hopper opening/closing part is easy to transport.

[Brief explanation of the drawing]

Fig. 1 is a sectional front view of essential parts of a conventional combination weighing device, Fig. 2 is a sectional front view of main parts of a combination weighing device according to an embodiment of this invention, and Fig. 3 is a hopper and a weighing unit in the above embodiment. FIG. 4 is a plan view showing the topmost assembly plate of the hopper opening/closing unit in the above embodiment removed, and FIG. 5 is a sectional side view of the essential parts of the hopper opening/closing unit. , FIG. 6 is a front view of the above-mentioned hopper opening/closing unit, FIG. 7 is a side view of the main part explaining the opening/closing operation of the hopper by the hopper opening/closing unit, and FIG. 8 is a diagram of a combination weighing device according to another embodiment of this invention. FIG. 2 is a schematic plan view showing the arrangement of main parts. 11...shoot, 16...pool hopper,
17...Measuring hopper, 19a, 19b, 19c
...Opening/closing lid, 20...Hopper opening/closing unit.

Claims (1)

[Scope of utility model registration request] A large number of hoppers are arranged in a ring, a pedestal is installed in the center of the space surrounded by these hoppers, and on this pedestal, a plurality of hopper opening/closing units for opening and closing each of the hoppers are arranged corresponding to each hopper. A combination weighing device characterized by being detachably attached along the radial direction of a pedestal.