JPS6339610Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a weight measuring device used in a device for sorting individuals by weight.

In general, in this type of weight measuring device, the objects to be sorted are placed on individual trays, the trays are made to run on a fixed track, and a number of measuring devices having springs with different spring constants are installed in a line along the track. It is known that when a tray carrying an object to be sorted is placed on the measuring device, a spring is displaced by the weight load, and this displacement causes the tray to tilt, causing the object to be sorted to fall. There is.

In this device, the objects to be sorted fall to a specific position depending on the amount of displacement of the spring, but there are cases where the objects to be sorted fall easily depending on the state on the tray or the shape of the object, and vice versa. Accurate weight selection is difficult.

In addition, as a device that can perform slightly more accurate sorting than this one, one end of the saucer is rotatably supported by a chain provided on both sides, and the other end is slidably supported by a guide rail. The guide rail is cut out only at the location where the device is set, and the spring is displaced when the tray passes the measuring device position.
As a result, the sliding end of the receiving tray may come off the guide rail after passing through the measuring device, causing the receiving tray to overturn at its pivotally supported portion, causing the objects to be sorted placed on it to fall.

In the above-mentioned apparatus, the objects to be sorted are caused to fall depending on whether or not the sliding end of the tray engages with the guide rail that appears next after passing the measuring device. At this time, there is a difference in the falling position of the object to be sorted depending on whether the object to be sorted has a considerable weight or is slightly lighter. Furthermore, if the weight of the object to be sorted is uncertain as to whether or not it will fall in a particular measuring device, the sliding end of the tray of the guide rail that appears again will collide with the part that engages and supports it, damaging the conveying device. Sometimes.

The present invention was proposed to solve the above-mentioned conventional drawbacks, and its feature is that when a predetermined weight is applied, the weight bearing member is displaced by a predetermined amount against the weight support spring. After the measurement, the spring and the weight receiving member are mechanically and mechanically disconnected, so that the weight receiving member can be freely and quickly displaced, and after the measurement, it is configured to return to the state before measurement. There is a particular thing.

Hereinafter, embodiments of the present invention will be explained based on the drawings.

In the figure, reference numeral 1 denotes a base chassis of a weight measuring device, and side walls 2, 2 rising up on both sides are provided.

A weight bearing member 3 is rotatably supported by a fixed pivot pin 5 at key points of the side walls 2, 2. The weight support member 4 has a substantially shape.
The device is held so as not to be displaced until a predetermined weight load is applied.
In the figure), the weight bearing member 3 is rotatably supported around a pivot fixing pin 5 that supports the weight bearing member 3 as a fulcrum.

A roller 6 is provided at a portion of the weight receiving member 3 that receives an external force, and an end of a receiving tray on which an object to be sorted, which will be described later, is placed thereon comes into contact therewith and is pushed upward.

Further, a link mechanism 70 is connected to the weight receiving member 3. This link mechanism 70 consists of a vertical link 7 and a horizontal link 8. In this embodiment, this link mechanism 70 is connected to the upright piece 3 of the weight bearing member 3.
1, one end of the horizontal link 8 is connected and pivotally supported via a movable pin 9, the other end of the horizontal link 8 is pivotally supported at the upper end of the vertical link 7 by a movable pin 10, and further The substantially center of the vertical link 7 is rotatably connected to the weight support member 4 via a movable pin 11.

On the other hand, the lower end of the vertical link 7 is removably engaged with one end of a locking member 12, and the locking member 12 is rotatably connected to the lower end of the weight supporting member 4 via a movable pin 13. and is vertically mounted by a movable pin 13 so as to rotate in the direction of arrow S in the normal state. 15 is a tension spring for weight measurement interposed between the weight support member 4 and the upper part 16 of the base chassis 1. This spring 1
The weight of the object to be sorted is measured according to the difference in the spring constant or tension of 5. This spring 1
The upper end fixing portion of 5 is suspended by an adjustment mechanism that can change its tension. The adjustment mechanism consists of a male threaded rod 17 inserted into a hole drilled in the upper end 16 of the base chassis, and two female threaded rings 18, 18' that are screwed into the male threaded rod 17. 18,
It is attached by sandwiching the upper end portion 16 at 18'.
It goes without saying that this tension adjustment mechanism includes a known adjustment mechanism that has moderation at every fixed rotation angle. A hole 17a for locking the upper end of the spring 15 is bored in the lower end of the male threaded rod 17. In this case, the biasing force of the spring 15 is changed by rotating the female threaded rings 18, 18' to change the screwing position with the male threaded rod 17. , female screw ring 18, 18'
to the upper end of the upper end portion 16 or
The spring constant adjustment mechanism of the present invention also includes a mechanism in which the spring tension is changed by rotating a male screw rod with a female screw (in this case, a female screw ring is not required).

Reference numeral 18a designates a stopper protruding from the side wall of the base 1, which is used to prevent the weight support member 4 from moving upward beyond a certain level by the tensile force of the spring 15. The stopper 18a may be fixed so that its position can be adjusted in the vertical direction.

Reference numeral 19 denotes a restoring spring stretched between the fixed pin 5 and the movable pin 10, and this is provided as necessary in order for the weight receiving member 3 to return to the state before measurement after measuring the object to be sorted. do. That is, the weight receiving member 3 may be returned to its original position by its own weight. Reference numeral 20 denotes a support for supporting the weight receiving member 3 at a predetermined position, so that the height of the weight receiving portion of the weight receiving member 3 is maintained constant before measurement.

As shown in FIG. 2, it is preferable to provide fan-shaped engaging members 7a and 12a with a cross section of approximately 1/4 at the engaging portions of the vertical link 7 and the locking member 12, so that the engagement between the vertical link 7 and the locking member 12 is extremely small. It is engaged by the width. This is because the slight height displacement of the roller 6 instantly releases the engagement between the two and quickly breaks the relationship between the weight receiving member 3 and the spring 15.

Next, the operation of this measuring device will be explained.

3a to 3c are explanatory diagrams showing the effect, and the following explanation will be based on these.

FIG. 3a shows that a load P is applied from below to above on the roller 6 of the weight receiving member 3, and the engaging member 7
A and 12a are shown in a state on the verge of being disengaged from each other. When the weight receiving member 3 rotates in the direction of arrow t about the pivot pin 5 in response to the load P, while the engaging members 7a and 12a are engaged with each other, the weight receiving member 3, the link 7, 8 and weight support member 4
are integrally connected via a locking member 12, and the entire body is rotated clockwise against a spring 15 about the fixing pin 5 as a central axis while maintaining the connected angle. At this time, the lock member 1 connected to the weight support member 4
2 is pushed down while sliding slightly in the direction of the arrow U due to the rotation of the lower end of the weight support member 4, but since its rear end is supported by the pin 14, the tip of the lock member, that is, the engagement The mating member 12a is forcibly lowered. Therefore, by lowering the engaging member 12a, the engaging members 7a, 12a are disengaged.

FIG. 3b shows a state in which the engaging members 7a, 12a are removed.

When the engaging members 7a and 12a are disengaged, the weight receiving member 3, the weight supporting member 4, the vertical link 7, and the horizontal link 8 are released from the action of the spring 15 and become free to rotate, so that the member 3 jumps up vigorously in the direction of arrow t. Rotate to.

On the other hand, the weight support member 4 is rotated counterclockwise about the pivot pin 5 by the tensile force of the spring 15 and returned to its original position. That is, when the engaging members 17a, 12a are disengaged, the transmission of force between the weight bearing member 3 and the weight supporting member 4 is instantaneously interrupted, and the relationship between the weight bearing member 3 and the spring 15 is lost.

FIG. 3c shows the state in which the weight receiving member 3 returns to its original position.

When the load P is removed, the weight balance of the weight receiving member 3, the vertical link 7, and the horizontal link 8 is set so that they rotate counterclockwise around the fixing pin 5 under normal conditions. The receiving member 3 will return to its original state when the load P above a certain level disappears. When the weight bearing member 3 returns to its original state, the engaging members 7a and 12a will be engaged again, and the engaging member 7a will be engaged with the engaging member 12a on its arcuate outer surface. It rotates counterclockwise around the pin 11 while pressing the outer surface formed in an arc shape downward. This pressing action causes the engaging member 12a to rotate counterclockwise around the pin 13. When the edge of the outer surface of the engagement member 7a exceeds the edge of the arcuate outer surface of the engagement member 12a, the downward pressing action of the engagement member 12a is eliminated, and the locking member 12 is locked. It rotates clockwise around 13 and returns to the state before weight measurement as shown in FIG. At this time,
The weight receiving member 3 is connected to the pivot pin 5 by the stopper 20.
Counterclockwise rotation about the center is prevented.

FIG. 4 shows an embodiment using the above-mentioned weight measuring device.

_A1 , _A2 , _. Reference numeral 30 denotes a chain that is wound around two sprockets 31, 31, and 32, . . . are saucers that are attached to the chain 30 at appropriate intervals and are rotatable at 90 degrees with respect to the moving direction of the chain.
33 is a belt for conveying objects to be sorted such as fruits to the tray 32; 34, ... are belts for conveying the sorted fruits, etc.; 35, ... are belts for conveying objects to be sorted such as fruits to the tray 32; 35, ... are belts for conveying objects to be sorted such as fruits to the tray 32; This is a guide plate to prevent rolling.

As shown in FIG. 5, the saucer 32 is pivotally mounted by a saucer attachment fitting 32b attached to a pin link plate 32a of the chain. The tray 32 is provided with a base end 32c that contacts the roller 6 of the weight bearing member 3 of the measuring device from below, and a tray portion 32d on the opposite left end on which fruits or the like are placed. The center of gravity of the saucer 32 is located closer to the saucer portion 32d than the pivot portion.

Now, fruit etc. are placed on the saucer 32, the base end 32c is supported by the guide plate 35, the saucer 32 is moved by the drive of the chain, and the first measuring device is moved.
When the base end portion 32c comes to the position _A1 , the base end portion 32c comes into contact with the roller 6 of the weight receiving member of the device, and the weight is measured. At this time, if the weight of the fruit, etc. is lighter than a predetermined weight, the weight receiving member 3 does not rotate against the spring 15, so that the fruit, etc. placed there passes through as it is, and then Guide plate 3 that appears
5, the working portion 32c is supported and moved to the next measuring device _A2 . If the weight of the fruit is heavier than the weight set in the measuring device _A2 , the weight receiving member 3 is rotated against the spring 15, and the actions shown in FIGS. 3a and 3b are performed. At this time, the saucer 32 is placed in the fifth position around the pin 321b of the mounting bracket.
It rotates in the direction of the arrow u in the figure and drops the fruits etc. placed on it to a predetermined position. Thereafter, the saucer 32 will move while remaining in the fallen state. In this case, saucer 3
The base end portion 32c of No. 2 moves while remaining above the guide plate 35 and the roller 6 of the measuring device that will appear later.

On the other hand, after the saucer 32 falls and rotates, the measuring device
Immediately after the operation described in FIG. 3c, the apparatus automatically returns to a state where the weight of the next fruit on the tray to be moved is measured.

After the tray 32 falls down, it moves to the sprocket 31 in that state, and the tray is turned downward on the sprocket 31, and in this state, the sprocket 3 is moved.
1, at which point the tray is again turned upward and horizontal to accept fruits, etc. A guide wheel 36 is provided on the sprocket 31 side to prevent the saucer 32 from falling over, and the outside of the tray portion 32d abuts against the outer periphery of the guide wheel 36 to change the orientation of the saucer 32.

In the above embodiment, the measuring device is arranged so that the weight is dropped in descending order of weight, and this adjustment is made using the weight measuring spring 15.
Although springs having different spring constants may be used, the adjustment mechanism of the present invention may also be used to employ springs having the same spring constant and change their tensions using the adjustment mechanism.

FIG. 6 shows the support member 1 that supports the lock member 12.
4, in which the support member 14a is an eccentric pin so that the height of the support surface in contact with the locking member 12 can be changed by rotation. By changing the height of the support surface of the locking member 12 in this way,
The width of the engagement portion between the lock member 12 and the vertical link 7 can be adjusted.

By adjusting the width of this engaging part, the spring 1
The displacement position required for the measurement in step 5 can be adjusted. That is, by raising the support surface, the engagement member 12a is lowered, so the engagement width is reduced, and conversely, by lowering the support surface, the engagement member 12a is lowered.
a increases and the engagement width increases. Therefore, by reducing the engagement width, the engagement relationship between the tip of the engaged member 7a and the engaging member 12a is instantly released due to a minute displacement, and the weight receiving member 3 is released while the displacement of the spring 15 is small. However, the connection with spring 15 will be cut off.

The present invention has the above-mentioned configuration, and according to this measuring device, a predetermined weight is determined by disassociating the spring 15 from the measuring spring 15 by a certain amount of displacement, and measuring the weight by the load applied to the weight receiving portion of the weight receiving member 3. The receiving member 3 can rotate. Therefore, since the weight is measured while the amount of displacement of the spring 15 is small, extremely accurate weight selection is possible.

In addition, since the measuring device quickly returns to the state before measurement after measurement, the tray for placing the objects to be sorted can be placed nearby, reducing the time required for sorting and reducing the width of the part to be sorted. This makes it possible to provide an extremely compact weight sorting device.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the weight measuring device of the present invention;
Fig. 2 is a longitudinal sectional view of the same, Figs. 3a to 3c are schematic diagrams showing its operation, Fig. 4 is a perspective view of an embodiment in which it is used in a sorting machine for fruits, etc., and Fig. 5 is a view of the saucer. FIG. 6 is a longitudinal sectional view showing the main part of another embodiment of the support member that supports the locking member 12. FIG. DESCRIPTION OF SYMBOLS 1... Base, 2, 2'... Side wall, 3... Weight receiving member, 4... Weight supporting member, 5... Pivot pin, 7
... Vertical link, 8 ... Horizontal link, 12 ... Lock member, 14 ... Support member, 15 ... Tension spring.

Claims (1)

[Claims for Utility Model Registration] 1. One end of the horizontal part of a substantially inverted T-shaped weight receiving member is rotatably supported on a base chassis via a fixing pin, the other end is a free end, and the tip of the vertical part is is rotatably connected to one end of the horizontal link via a movable pin, and the upper end of the vertical link is rotatably connected to the other end of the horizontal link via a movable pin, while a substantially ¬shaped weight support The horizontal end of the member is rotatably supported on the base chassis via the fixed pin, and the lock member is rotatably supported on the vertical end via the movable pin, and the weight supporting member is rotatably supported on the vertical end. A tension spring is interposed between the key point and the upper part of the base chassis, and the intermediate part of the vertical link and the horizontal intermediate part of the weight supporting member are connected to each other by a movable pin so as to be freely rotatable. The lower end of the vertical link and one end of the locking member are removably engaged, so that the spring action on the weight receiving member can be immediately released when a set measured weight is exceeded. Weight measuring device. 2. The weight measuring device according to claim 1, wherein the tension force of the tension spring is adjustable.