JP2008116413A - Weight selector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weight selector of high versatility and high reliability equipped with a weighing device capable of weighing various articles by one load detector. <P>SOLUTION: This weight selector includes the weighing device 100 having the first conveying means 1 for conveying the articles P, the second conveying means 2 having a conveying length longer than a conveying length of the first conveying means and for conveying the articles P, the load detector LC for detecting loads of the first and second conveying means 1, 2 under the condition laid with the articles P, and the first and second clamp switching mechanisms 5, 6 arranged respectively in midways of transmission routes of the loads between the first and second conveying means 1, 2 and the load detector LC, and for controlling load transmission from the first and second conveying means 1, 2 to the load detector LC. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a weight sorter, and more particularly, to a clamp switching technique for controlling transmission of an article load placed on a conveying means to a load detector.

  The weighing conveyor device is a device that measures the weight of an article while conveying the article at a constant speed. For example, the weighing conveyor device is provided as a standard in a weight sorter (auto checker) that sorts articles according to weight. One example of such a weighing conveyor device is a load conveyor (load detector) that loads an article on a belt surface and conveys the article by the belt, and a load cell connected to the weighing conveyor to detect the load of the article together with the weighing conveyor. With.

  Here, from the viewpoint of increasing the processing capacity of the weight sorter, it is preferable if the weight sorter can be designed to a specification capable of automatically weighing as many articles as possible per unit time. For this reason, although it is desirable to carry the articles that are the objects to be weighed in a short time on the weighing conveyor, when two or more articles are placed on the weighing conveyor at the same time, The weight cannot be measured. Therefore, the interval between the articles (that is, the interval of the article carry-in time) is inevitably restricted to be a predetermined interval or more. One of the predetermined intervals described above is that if two or more articles cannot be placed on the weighing conveyor at the same time if an article is carried into the weighing conveyor with an interval longer than the conveyor length (conveyance length) of the weighing conveyor, The guideline is the conveyor length.

  Therefore, if the conveyor length is shortened, the processing capacity of the weight sorter can be improved. However, in order to measure the weight of the article appropriately by the weight sorter, at least the length in the conveyance direction of the article (hereinafter referred to as “article length”). The length of the conveyor cannot be shortened more than the length of the article, and the conveyor length is usually designed to be longer than the article length of the article for the reasons described below.

  Weight from the time when the entire article is completely placed on the weighing conveyor so that the rear end of the article in the conveying direction enters the entrance of the weighing conveyor, until the point when the leading edge of the article in the conveying direction reaches the outlet of the weighing conveyor A certain amount of time is required from the viewpoint of measuring the weight of the appropriate article by the sorter. For example, the control device for the weight sorter calculates the final weight data by filtering the load signal data so as to remove the vibration component by the drive motor that drives the weighing conveyor within the above-mentioned time. . The filtering processing time is almost constant without depending on the article length of the article, and the conveyor length is practically optimum to be longer than the article length of the article by the distance estimated from the above-mentioned time. Designed.

  However, if the article length is frequently changed according to the type of article to be sorted by the weight sorter, the optimum design of the conveyor length becomes difficult. In other words, if the conveyor length is made long enough to match the article of the maximum article length assumed, the processing capacity of the weight sorter will be significantly reduced due to the above reasons.

  On the other hand, it is also one idea to replace the weighing conveyor according to the length of the article, but in this case, it is necessary to replace the feeding conveyor and the distribution conveyor installed before and after the weighing conveyor, which is troublesome. Pass.

  Then, the idea which solves such an inconvenience is described as a prior art example in patent document 1 and patent document 2, for example.

  In the multiple weighing apparatus described in Patent Document 1, two weighing conveyors having different conveyor lengths are arranged in series along the conveying direction of the conveyor, and the weighing with a short conveyor length is performed according to the article length of the article. A suitable use combination between a conveyor and a weighing conveyor with a long conveyor length is shown.

The multiple weighing device described in Patent Document 2 is an apparatus developed from the control method of the multiple weighing device of Patent Document 1, and more specifically, the operation of the weighing conveyor from the processing capacity of the article and the article length of the article. A variation parameter corresponding to the condition is calculated, and an appropriate use combination of two weighing conveyors having different conveyor lengths for weighing articles based on the variation parameter is selected.
JP-A-10-122940 JP 2006-105729 A

  By the way, when the weighing conveyor device is not used, that is, when the operation ON-OFF switch of the weighing conveyor device is turned off (stopped), the weighing conveyor device can be used by the careless operator who is unfamiliar with the handling of the weighing conveyor device. An overload is applied (for example, an extremely excessive amount is put on the weighing conveyor), and the load cell may be damaged. In particular, in the weighing conveyor device described in the above-described conventional example, it is necessary to provide a total of two load cells, one for each of two weighing conveyors having different conveyor lengths. Technology to properly protect the load cell is important. In short, in the experience so far, the situation where an overload that breaks the load cell is given to the load cell frequently occurs in the time zone when the weight sorter (weighing conveyor device) is not used, so the load cell is protected during that time zone. Must be done appropriately. The above-mentioned time zone means the period from the end of the work on the production line by the weight sorter to the start of the next work. More precisely, the end of this work is the weight selection. This refers to the time when the operation ON-OFF switch of the machine (the weighing conveyor device) is turned OFF (operation stopped), and then the original power source of the weight sorter is also turned OFF.

  In other words, the conventional weighing conveyor device can measure various articles (for example, articles of various article lengths) without having to replace the weighing conveyor, but it can protect against an unexpected overload of the load cell. From this point of view, there is room for improvement.

  The present invention has been made in view of such circumstances, and a weighing device that can measure various articles (for example, articles of various article lengths) with a single load detector and has improved versatility and reliability. An object is to provide a weight sorter provided.

  In order to solve the above-described problems, a weight sorter according to the present invention includes a first transport unit that transports an article, a load detector that detects a load of the first transport unit on which the article is placed, and the first transport unit. And a first clamp switching mechanism that is disposed in the middle of a load transmission path between the first conveying means and the load detector, and that controls the load transmission from the first conveying means to the load detector. The device sorts the articles based on the load of the articles by the weighing device.

  As a result, when the operation of the weight sorter is stopped (that is, when the operation ON-OFF switch of the weight sorter is turned off), the load detector is not exposed to the load so that the load detector is not exposed to the load. The load transmission can be controlled appropriately, and as a result, the reliability of the weight sorter increases.

  In addition, a second conveying unit having a conveying length longer than the conveying length of the first conveying unit and conveying an article, and a load transmission path between the second conveying unit and the load detector. And a second clamp switching mechanism that controls load transmission from the second conveying means to the load detector, and the load of the second conveying means in a state where an article is placed is applied to the load detector. May be detected.

  Thereby, various articles | goods (for example, articles | goods of various article length) can be measured with one load detector, As a result, the versatility and reliability of a weight sorter increase.

  Here, the first and second clamp switching mechanisms may be set to any one of a full load transmission mode, a no-load mode, a first partial load transmission mode, and a second partial load transmission mode.

  In the full load transmission mode, the loads of both the first and second transport means are transmitted to the load detector by the first and second clamp switching mechanisms.

  In the first partial load transmission mode, the load of only the first transport means is transmitted to the load detector by the first and second clamp switching mechanisms.

  In the second partial load transmission mode, the load of only the second conveying means is transmitted to the load detector by the first and second clamp switching mechanisms.

  In the no-load mode, the first and second clamp switching mechanisms do not transmit the loads of both the first and second transport means to the load detector.

  Moreover, you may provide the memory | storage part which memorize | stored the article length of the said article | item, the drive device which drives the said 1st and 2nd clamp switching mechanism, and a control apparatus.

  When the load of the article is detected by the load detector, the control device gives an operation parameter for controlling the driving of the driving device based on the article length of the article to the driving device, and The first and second clamp switching mechanisms are set to any one of the full load transmission mode, the first partial load transmission mode, and the second partial load transmission mode by driving the driving device based on the operation parameters. it can.

  Here, when the article length of the article is shorter than the conveyance length of the first conveyance means, it is preferable to set the first and second clamp switching mechanisms to the first partial load transmission mode, When the article length of the article is longer than the conveying length of the first conveying means and shorter than the conveying length of the second conveying means, the first and second clamp switching mechanisms are set to the second partial load. Preferably, the transmission mode is set, and when the article length of the article is longer than the conveyance length of the second conveyance means, the first and second clamp switching mechanisms are set to the full load transmission mode. Is preferred.

  In this way, according to the weight sorter of the present invention, articles of various article lengths can be weighed by a single load detector, and as a result, the versatility and reliability of the weight sorter increases.

  On the other hand, a drive device that drives the first and second clamp switching mechanisms and a control device may be provided.

  When the operation of the weight sorter is stopped, the control device gives an operation parameter for controlling the drive of the drive device to the drive device, and the first and second clamp switching mechanisms are It is preferable that the no-load mode is set by driving the drive device based on the operation parameters.

  In this way, in the weight sorter of the present invention, when the operation of the weight sorter is stopped, load transmission to the load detector is appropriately prevented, and as a result, an unexpected overload to the load detector, etc. Removes the root cause of damage caused by

  For example, when the first and second transport means are overloaded by the carelessness of an operator who is unaccustomed to handling the weight sorter while the weight sorter is shut down, Even if it is a case where it mounts on the 1st and 2nd conveyance means, damage to a load detector can be prevented beforehand.

  In addition, one configuration example of the first clamp switching mechanism includes two or more movable units that enable establishment and release of the connection to the support that supports the first transport unit, and the first movable movable unit includes the first movable unit. The unit may be supported by a pedestal for no load, and the second movable unit may be supported by a pedestal for load placed on the load detector.

  Further, the first movable unit includes a fan-shaped gear connected to a first rotating rod, and the second movable unit is connected to a second rotating rod and includes a disk-shaped gear that meshes with teeth of the fan-shaped gear. Including a connection between the second movable unit and the support when the engagement between the fan-shaped gear and the disk-shaped gear is released by rotation of the fan-shaped gear, When the connection between the first movable unit and the support is released and the fan-shaped gear is engaged with the disk-shaped gear by the rotation of the fan-shaped gear, the first movable unit is May be established, and the connection between the second movable unit and the support may be released.

  As described above, when the meshing between the sector gear and the disk gear is released, the connection between the second movable unit and the support is established, and the first conveying means is established. Since the first clamp switching mechanism is set to an appropriate mode so that the load of the first load is transmitted to the load detector, the load of the article placed on the first or second conveying means is detected by the load detector. Mutual contact based on the meshing between the sector gear and the disk gear can be appropriately cut. As a result, the article load is preferably detected with high accuracy by the load detector.

  In addition, you may provide the drive device which rotates the said 1st rotation rod.

  Thereby, based on the automation of the clamp switching operation of the weighing device, the efficiency of the switching operation can be improved.

  Moreover, you may provide the manual lever which rotates the said 1st rotation rod.

  As a result, the driving device can be eliminated, and the cost of the weighing device can be reduced.

  According to the present invention, a variety of articles (for example, articles of various article lengths) can be weighed by one load detector, and a weight sorter equipped with a weighing device with improved versatility and reliability can be obtained.

  FIG. 1 is a schematic diagram illustrating a configuration example of a weighing conveyor device according to an embodiment of the present invention, and is a view of the weighing conveyor device viewed from the side (left and right direction).

  For convenience of the following description, the conveyance direction of the article P of the weighing conveyor apparatus 100 (refer to the thick arrows shown in FIG. 1) is referred to as “front-rear direction”, and the direction in which the weight of the article P of the weighing conveyor apparatus 100 is applied is “up and down”. A direction perpendicular to the “front-rear direction” and the “up-down direction” (direction perpendicular to the paper surface of FIG. 1) is defined as a “left-right direction”.

  As shown in FIG. 1, the weighing conveyor device 100 includes a first-stage weighing conveyor 1 (first conveying means) and a second-stage weighing conveyor 2 (second conveying means) having different conveyor lengths (conveying lengths) for conveying an article P, and an article P And a single load cell LC (load detector) for detecting the load of the first and second weighing conveyors 1 and 2 in a state where the load is placed.

  Then, as will be described in detail later, the clamp switching mechanisms 5 and 6 (first and second clamp switching mechanisms) are in the middle of the load transmission path of the article P between the front and rear weighing conveyors 1 and 2 and the load cell LC. It arrange | positions and is supported by the base structure B (after-mentioned). As a result, the transmission of the load from the front and rear weighing conveyors 1 and 2 to the load cell LC is controlled by the clamp switching mechanisms 5 and 6. As shown in FIG. 1, the control system of the weighing conveyor device 100 includes a control device 101 that controls the operation of the weighing conveyor device 100, a motor control circuit 106, an A / D converter 103, and various operations. There is an operation setting display unit 102 that performs mode setting, product type registration of the article P, and various displays.

  Here, an example is shown in which the conveyor length of the former-stage weighing conveyor 1 is shorter than that of the latter-stage weighing conveyor 2, but conversely, even if the conveyor length of the former-stage weighing conveyor 1 is longer than that of the latter-stage weighing conveyor 1 Good (however, in this case, the weighing operation of the weighing conveyor device 100 described later needs to be modified).

  In addition, the weight sorter equipped with the weighing conveyor device 100 of this embodiment is usually a feeding conveyor (feeding device) arranged in front of the preceding weighing conveyor 1 in addition to the weighing conveyor device 100 of FIG. The distribution conveyor (distribution device) is arranged behind the weighing conveyor 2 and distributes the articles P based on the load of the articles P detected by the load cell LC. As such, a detailed description of these conveyors is omitted.

  The first-stage and second-stage weighing conveyors 1 and 2 include belts 1c and 2c for conveyance, drive rollers 1a and 2a that drive these belts 1c and 2c, and driven rollers 1b and 2b, respectively. The belts 1c and 2c are moved through the driving rollers 1a and 2a by the driving force of the motors 1d and 2d connected to the rotating shaft 2a. Thereby, the article P placed on the belts 1c and 2c is conveyed from the front to the rear at a predetermined conveyance speed V. In addition, the front and rear weighing conveyors 1 and 2 are connected to conveyor support brackets 7a and 7b and conveyor support brackets 7a and 7b disposed on both sides of the weighing conveyors 1 and 2, respectively. It is connected to a base structure B via a clamp switching mechanism 5, 6 (to be described later) that is connected to a later-described clamp and switches the clamps of the conveyor supports 9a, 9b.

  A load cell LC is stored below the front and rear weighing conveyors 1 and 2 for outputting the load with the article P placed on the belts 1c and 2c of the weighing conveyors 1 and 2 to the control device 101 as weight data. Yes. That is, when the loads of the front and / or rear weighing conveyors 1 and 2 supported by the conveyor support brackets 7a and 7b and the conveyor supports 9a and 9b are transmitted to the load cell LC by the clamp switching mechanisms 5 and 6. (Hereinafter abbreviated as “at the time of load transmission to the load cell LC”), the load of the article P in a state where the loads of the front and rear weighing conveyors 1 and 2 are added is detected by the strain amount of the load cell LC.

  Two photoelectric tubes 26 and 27 (light sensing means) for detecting the load detection timing of the article P are provided in the vicinity of the entrance (front end) of each of the front and rear weighing conveyors 1 and 2. These phototubes 26 and 27 detect when the front end of the article P reaches the entrances of the front and rear weighing conveyors 1 and 2 and detect this when, for example, a detection signal for starting an appropriate timer incorporated in the control device 101. And this signal is transmitted to the control device 101.

  When the load is transmitted to the load cell LC, the control device 101 receives the detection signal transmitted from the phototubes 26 and 27 so that the load of the article P can be measured most accurately from the time when the detection signal is received. After a predetermined time (described later), an analog signal output from the load cell LC is converted into a digital signal (hereinafter abbreviated as “A / D (analog / digital) conversion”), and the digital signal is weighted by the article P. The data is stored in the storage unit 105 built in the control apparatus 101 as data.

  That is, as shown in FIG. 1, the control device 101 includes a CPU 104 made of a microprocessor or the like, and a storage unit 105 made of ROM (read only memory), RAM (random access memory), or the like, and the A / D described above. It is connected to an A / D converter 103 that performs conversion. The CPU 104 operates in accordance with a calculation program stored in the storage unit 105, and for example, calculates the weight data of the article P based on a digital signal output from the A / D converter 103.

  The control device 101 is connected to the motor control circuit 106, and the motor control circuit 106 controls the operation of the actuators of the clamp switching mechanisms 5 and 6 (for example, the rotary motors 3a and 3b; see FIG. 2) according to the command of the CPU 104. To do.

  The control device in this specification refers to any of a control device group in which a plurality of control devices cooperate to control the overall operation of the weighing conveyor device 100 and a single control device in which these control devices are integrated. Also means.

  Therefore, as shown in FIG. 1, the control device 101 uses the motor control circuit 106 to control the operation of the motor 1 d for driving the front-stage weighing conveyor 1 and the motor 2 d for driving the rear-stage weighing conveyor 2. good.

  The storage unit 105 (see, for example, FIG. 8) is connected to the CPU 104, and the above-described calculation program for appropriately performing the operation of the weighing conveyor device 100 and the operation parameters of the clamp switching mechanisms 5 and 6 are stored in the storage unit 105 in advance. Has been.

  The operation setting display unit 102 connected to the control device 101 via an appropriate input / output port (not shown) includes various operation parameters in addition to the power switch and the operation ON / OFF switch of the weighing conveyor device 100. An operation panel (not shown) provided with a setting switch, a display panel (not shown) for displaying various output values related to weight data output from the control device 101 and data input by the operation panel, Data output device (for example, a printer; not shown).

  Next, a clamp switching mechanism 5 that switches the clamp of the front-stage weighing conveyor 1 (conveyor support 9a), which is a characteristic part of the weighing conveyor apparatus 100 of the present embodiment, and a base that supports the front-stage weighing conveyor 1 via the clamp switching mechanism 5 The structure of the structure B will be described in detail with reference to the drawings.

  In addition, since the structure of the clamp switching mechanism 6 which switches the clamp of the back | latter stage weighing conveyor 2 (conveyor support 9b) is the same as the clamp switching mechanism 5, detailed description of a structure of the clamp switching mechanism 6 is abbreviate | omitted here.

  However, in the figure, the reference numerals of the constituent elements of the clamp switching mechanism 6 corresponding to the constituent elements of the clamp switching mechanism 5 are illustrated by changing the end of the reference numerals from “a” to “b”. Yes.

  FIG. 2 is a cross-sectional view of the weighing conveyor device taken along line II-II in FIG. 3 is a cross-sectional view of the clamp switching mechanism and the conveyor support along the line III-III in FIG.

  As shown in FIG. 1 and FIG. 2, the pedestal structure B is disposed on the ground, and is disposed on the load cell LC when the load cell LC is unloaded, and on the load cell LC. There is a support base B2 for load at the time of load transmission.

  As shown in FIGS. 1 and 2, the no-load support pedestal B1 is formed in a substantially rectangular and annular base plate B1A installed on the ground, and extends upward from the vicinity of the four corners of the base plate B1A. And four support plates B1B.

  Of the four support plates B1B, a pair of front two support plates B1B plays a role of supporting the front-stage weighing conveyor 1, and a pair of rear two support plates B1B is a rear-stage weighing conveyor. It has a role to support 2.

  In other words, the clamp switching mechanism 5 of the front weighing conveyor 1 is sandwiched between a pair of front support plates B1B (a support plate B1B located on the right side and a support plate B1B located on the left side) as shown in FIG. Thus, when the load of the preceding weighing conveyor 1 is not transmitted to the load cell LC by the clamp switching mechanism 5, the conveyor support 9a of the clamp switching mechanism 5 supports the front based on the switching operation of the clamp switching mechanism 5 described in detail later. Connected to a pair of plates B1B.

  As shown in FIGS. 1 and 2, the load support base B2 is formed of a substantially rectangular base plate B2A fixed to the upper surface of the load cell LC, and extends upward from the vicinity of the four corners of the base plate B2A. And four support plates B2B.

  Of the four support plates B2B, the pair of front two support plates B2B plays a role of supporting the front-stage weighing conveyor 1, and the pair of rear two support plates B2B is a rear-stage weighing conveyor. It has a role to support 2.

  That is, as shown in FIG. 2, the clamp switching mechanism 5 of the pre-stage weighing conveyor 1 is located on the inner side of the pair of the front support plates B1B and the pair of the front support plates B2B (the support plate located on the right side). B2B and the support plate B2B located on the left side), and when the load is transmitted to the load cell LC, the conveyor support 9a of the clamp switching mechanism 5 is based on the switching operation of the clamp switching mechanism 5 described in detail later. And connected to a pair of front support plates B2B.

  Next, the configuration of the clamp switching mechanism 5 will be described in detail with reference to the drawings.

  As shown in FIGS. 2 and 3, the clamp switching mechanism 5 is located on the upper side and the lower side of the back side of the conveyor support 9a, and extends to the left and right so as to intersect the conveyor support 9a from the back side. A columnar upper rotating rod 10a and a columnar lower rotating rod 11a are provided.

  Further, as shown in FIG. 2, the clamp switching mechanism 5 is connected to the upper rotation rod 10a, and is connected to a pair of left and right clamp linear moving bodies 16a and 18a arranged to face each other at a certain distance from the left and right. And a pair of left and right clamp linear moving bodies 17a and 19a that are connected to the rod 11a and arranged to face each other at a predetermined distance from each other.

  The upper rotary rod 10a is provided at the upper ends of the pair of support plates B1B of the no-load support base B1, is rotatably supported by the bearing portions 21 and 22, and further extends to the right side so as to form a so-called cam (FIG. 1)). The upper rotating rod 10a described above functions as a rotating shaft of the rotating motor 3a and can be rotated by the power of the rotating motor 3a.

  The lower rotating rod 11a is rotatably supported by bearings 33 and 34 provided at the upper ends of the pair of support plates B2B of the load support base B2, and further extends to the right side, and is formed on the right support plate B1B. Through the hole, it is connected to a disk gear (spur gear) 8a that is gear-connected to the sector gear 15a over a certain rotation range.

  Although FIG. 1 shows a form in which the teeth of the sector gear 15a mesh with the teeth of the disc gear 8a, the sector gear 15b and the disc gear 8b of the clamp switching mechanism 6 are illustrated. As will be understood by taking into consideration the mode of meshing with each other, these members can also take a form in which the meshing between them is disengaged. Thus, by making the shape of the sector gear 15a connected to the vicinity of the right end of the upper rotating rod 10a into a sector shape, in addition to the form in which the sector gear 15a and the disc gear 8a are engaged, The reason why the meshed form can be taken will be described later.

  As shown in FIG. 2, the pair of the left and right clamp linear moving bodies 16a and 18a has a trapezoidal cross section by taper-cutting both end faces in the longitudinal direction (front and rear and rearward; the direction perpendicular to the paper surface of FIG. 2). Plate-shaped left and right pawl support portions 16a-1 and 18a-1 that are formed, and a substantially rectangular left and right body portion 16a-2 having notches into which these left and right pawl support portions 16a-1 and 18a-1 are fitted, 18a-2. Then, a pair of depressions having substantially the same shape as the left and right pawl support portions 16a-1 and 18a-1 (the longitudinal section is trapezoidal) so as to face each of the left and right pawl support portions 16a-1 and 18a-1. Portions 9c and 9d are formed on the conveyor support 9a. Accordingly, the left and right pawl support portions 16a-1 and 18a-1 and the pair of recessed portions 9c and 9d are easily fitted.

  When the left and right pawl support portions 16a-1 and 18a-1 are fitted in the recess portions 9c and 9d, the conveyor support 9a is connected to the no-load support base B1 via the upper rotating rod 10a and the bearing portions 21 and 22. Are connected (supported) by a pair of support plates B1B.

  Similarly, as shown in FIG. 2, the pair of left and right clamp linear moving bodies 17a and 19a has a plate-like left and right pawl support portion whose cross section is formed in a trapezoidal shape by tapering both ends in the longitudinal direction. 17a-1 and 19a-1 and rectangular left and right main body portions 17a-2 and 19a-2 having notches into which the left and right pawl support portions 17a-1 and 19a-1 are fitted. And a pair of hollow parts of substantially the same shape (longitudinal section is trapezoidal) as the left and right pawl support parts 17a-1 and 19a-1 so as to face each of these left and right pawl support parts 17a-1 and 19a-1. 9e and 9f are formed on the conveyor support 9a. Accordingly, the left and right pawl support portions 17a-1 and 19a-1 and the pair of recess portions 9e and 9f are easily fitted.

  When the left and right pawl support portions 17a-1 and 19a-1 are fitted into the recess portions 9e and 9f, the conveyor support 9a is connected to the load support base B2 via the lower rotation rod 10a and the bearing portions 33 and 34. It is connected (supported) by a pair of support plates B2B.

  The pair of left and right clamp linear moving bodies 16a and 18a, the upper rotating rod 10a, and the fan-shaped gear 15a constitute one movable body unit that rotates and linearly moves. The pair of left and right clamp linear moving bodies 17a and 19a, the lower rotating rod 11a, and the disc-shaped gear 6a constitute another movable body unit that performs rotational motion and linear motion.

  Here, the left main body portion 16a-2 of the left clamp linear moving body 16a and the right main body portion 18a-2 of the right clamp linear moving body 18a can be appropriately slid right and left by the following three connecting means. It is connected.

  First, a part of the left and right sides is threaded on the surface of the upper rotating rod 10a connected to the pair of left and right clamp linear moving bodies 16a and 18a. More specifically, as shown in FIGS. 2 and 3, a right screw portion 40 with a right screw formed is provided on the right side portion, and a left screw portion 42 with a screw thread formed on the left screw is provided on the left side portion. ing. And the screw hole formed in the approximate center of the right main-body part 18a-2 of the right clamp linear moving body 18a is screwed (connected) to the right screw part 40 of the upper stage rotation rod 10a, and the left clamp linear moving body 16a A screw hole formed substantially at the center of the left main body portion 16a-2 is screwed (connected) to the left screw portion 42 of the upper rotating rod 10a.

  The pair of left and right clamp linear moving bodies 16a and 18a are connected to each other by a spring 50 (elastic body) as shown in FIG. For this reason, the pair of left and right clamp linear moving bodies 16a and 18a is moved by the spring 50 at the time of clamp switching of the conveyor support 9a by the pair of left and right clamp linear moving bodies 16a and 18a described later (left and right clamp linear moving bodies 16a and 18a). The pair of left and right clamp linear moving bodies 16a and 18a is appropriately biased in the left and right direction so as to eliminate backlash.

  Further, as shown in FIGS. 1 and 3, a through hole is formed in the vicinity of the rear end of the pair of left and right clamp linear moving bodies 16a and 18a through which a guide rod 13a extending in parallel with the upper rotation rod 10a. In this way, the pair of left and right clamp linear moving bodies 16a and 18a is guided by the guide bar 13a and supported by the guide bar 13a so as to be slidable left and right.

  Both ends of the guide bar 13a extend further to both sides from the pair of through holes of the left and right clamp linear moving bodies 16a, 18a, and stopper members (for example, nuts 13c, 13d) are fitted to both ends. For this reason, the distance between the pair of the left and right clamp linear moving bodies 16a and 18a can be regulated by the nuts 13c and 13d so as not to spread too much.

  The substantially central portion of the guide bar 13a is supported by a guide fulcrum member 51 fixed at an appropriate position (not shown) of the no-load support pedestal B1, whereby the left and right clamp linear moving body 16a by the guide bar 13a, The support function of the pair 18a is enhanced.

  On the other hand, the surface of the lower rotating rod 11a connected to the pair of left and right clamp linear moving bodies 17a and 19a is similarly threaded on both the left and right sides as shown in FIG. A right screw portion 41 formed with a right screw is provided on the right side portion, and a left screw portion 43 formed with a left screw is provided on the left side portion. Further, as shown in FIG. 1, the guide bar 14a extends in parallel with the lower rotary rod 11a through a through hole formed in the vicinity of the rear end of the pair of left and right clamp linear moving bodies 17a and 19a. Further, the pair of left and right clamp linear moving bodies 17a and 19a are connected to each other by a spring (elastic body; not shown).

  However, if the description of the connection configuration of the pair of left and right clamp linear moving bodies 16a and 18a described above is taken into account, the connection configuration of the pair of left and right clamp linear movement bodies 17a and 19a can be easily understood. Detailed description of the connection configuration will be omitted.

  Next, the operation of the clamp switching mechanism 5 will be described in detail.

  According to the clamp switching mechanism 5, the rotational power of the upper rotary rod 10a by the rotary motor 3a is caused by the screw joint between the upper rotary rod 10a and the pair of left and right clamp linear moving bodies 16a and 18a. , 18a is converted into a moving force in the left or right direction.

  On the other hand, according to the clamp switching mechanism 5, the rotational power of the upper rotary rod 10a by the rotary motor 3a is transmitted to the lower rotary rod 11a by the gear meshing between the teeth of the sector gear 15a and the disk gear 8a. After that, due to the screw joint between the lower rotating rod 10a and the pair of left and right clamp linear moving bodies 17a and 19a, the rotational power of the lower rotating rod 11a becomes the left or right direction of the pair of left and right clamp linear moving bodies 17a and 19a. It is converted to the movement force of.

  That is, the left and right clamp linear moving bodies 16a and 18a are configured to be movable along the axial direction (left and right direction) of the guide bar 13a, while the upper rotation rod 10a and the guide bar 13a are used to center the left and right direction. It is regulated to turn around. Similarly, the left and right clamp linear moving bodies 17a and 19a are configured to be movable along the axial direction (left and right direction) of the guide bar 14a, while the lower rotation rod 11a and the guide bar 14a are used to move the left and right direction. It is regulated to turn around.

  For this reason, when the upper and lower rotary rods 10a and 11a are rotated about the axis thereof, the left and right clamp linear moving bodies 16a, 17a, 18a and 19a engaged with the upper and lower rotary rods 10a and 11a by screw joint are , Move left or right.

  For example, when the upper rotating rod 10a is rotated counterclockwise (hereinafter abbreviated as “inverted”) as shown by the arrow in FIG. 1 by the rotational power of the rotary motor 3a, the upper rotating rod 10a is screwed to the right screw portion 40. The right clamp linear moving body 18 a moves to the left while being guided by the guide rod 13 a against the spring force of the spring 50, and the left clamp linear moving body 16 a screwed to the left screw portion 42 is connected to the spring 50. It moves to the right while being guided by the guide bar 13a against the spring force. That is, by reversing the upper stage rotating rod 10a, the pair of left and right clamp linear moving bodies 16a and 18a connected to the upper stage rotating rod 10a is narrowed in the direction in which the connection with the conveyor support 9a is established. Moving.

  On the other hand, when the upper rotating rod 10a is reversed, the lower rotating rod 11a rotates clockwise based on the gear mesh between the teeth of the sector gear 15a and the disk gear 8a, as shown by the arrows in FIG. Rotate (hereinafter abbreviated as “forward rotation”).

  In this case, the right clamp linear moving body 19a screwed to the right screw portion 41 moves to the right side while being guided by the guide rod 13a against the spring force of the spring 50, and is screwed to the left screw portion 43. The left clamp linear moving body 17a moves to the left while being guided by the guide rod 13a against the spring force of the spring 50. That is, due to the forward rotation of the lower rotating rod 11a, the pair of left and right clamp linear moving bodies 17a and 19a connected to the lower rotating rod 11a is supported in the opposite direction to the pair of the left and right clamp linear moving bodies 16a and 18a. It moves so that a mutual distance may be expanded in the direction which cancels | releases connection of the tool 9a.

  In turn, if the upper rotary rod 10a is rotated forward by the rotational power of the rotary motor 3a, the pair of left and right clamp linear moving bodies 16a and 18a increases the distance between each other in the direction of releasing the connection of the conveyor support 9a. The pair of left and right clamp linear moving bodies 17a and 19a move so as to reduce the distance between them in the direction of establishing the connection with the conveyor support 9a.

  The left / right movement control of the pair of left / right clamp linear moving bodies 16a, 18a connected to the upper rotating rod 10a and the left / right direction of the pair of left / right clamp linear moving bodies 17a, 19a connected to the lower rotating rod 11a. If the movement control of the left and right clamp linear moving bodies 16a and 18a is used (to be precise, by the left and right pawl support portions 16a-1 and 18a-1 of the pair of left and right clamp linear moving bodies 16a and 18a), the conveyor support 9a (the connection between the pair of left and right clamp linear moving bodies 17a and 19a and the conveyor support 9a is released) and the pair of left and right clamp linear moving bodies 17a and 19a. (To be precise, by the left and right pawl support portions 17a-1 and 19a-1 of the pair of left and right clamp linear moving bodies 17a and 19a) and the conveyor support 9a The connection between the pair of left and right clamp linear moving bodies 16a and 18a and the conveyor support 9a is released). It becomes possible to select alternatively based on the operation.

  In addition, the form which establishes the connection between the above-mentioned pair of left and right clamp linear moving bodies 16a and 18a and the conveyor support 9a refers to the pair of support plates B1B of the unloading support base B1 as the load of the preceding weighing conveyor 1 In other words, this form corresponds to a no-load state on the load cell LC in which the load of the preceding weighing conveyor 1 is not transmitted to the load cell LC.

  On the other hand, the form in which the connection between the pair of left and right clamp linear moving bodies 17a and 19a and the conveyor support 9a is established is that the load of the preceding weighing conveyor 1 is applied to the pair of support plates B2B of the load support base B2. In other words, this form corresponds to a load transmission state to the load cell LC in which the load of the preceding weighing conveyor 1 is transmitted to the load cell LC.

  Thus, according to the clamp switching operation of the conveyor support 9a by the clamp switching mechanism 5, either one of the above-described no-load state to the load cell LC and the above-described load transmission state to the load cell LC can be selected. It becomes like this.

  Here, from the viewpoint of improving work efficiency by automating the clamp switching operation, the clamp switching operation by driving the rotary motor 3a is illustrated, but the present invention is not limited to this. For example, the rotating rods 10a and 11a may be manually forward and reverse based on the operation of a manual lever (not shown) by the operator. Thereby, the rotation motors 3a and 3b can be eliminated, and the cost of the weighing conveyor device 100 can be reduced.

  Further, from the viewpoint of reducing the cost by reducing the number of rotary motors as power sources, upper and lower stages by gear meshing between the fan gear 15a and the disk gear 8a based on the control of the rotary motor 3a of the control device 101. Although the forward reversal of the rotating rods 10a and 11a is illustrated, it is not limited to this. For example, each of the upper and lower rotary rods 10a and 11a may be forwardly reversed by a separate rotary motor.

  Further, practically, the switching timing of the clamp switching mechanisms 5 and 6 is such that the conveyor support 9a is always connected (supported) to at least one of the upper and lower rotary rods 10a and 11a at the time of clamp switching. (The control of forward / reverse rotation of the upper and lower rotary rods 10a and 11a) must be performed, but detailed description of such switching timing is omitted here.

  Next, based on the cooperation between the clamp switching mechanism 5 for switching the clamp of the front-stage weighing conveyor 1 (conveyor support 9a) and the clamp switching mechanism 6 for switching the clamp of the rear-stage weighing conveyor 2 (conveyor support 9b). A description will be given of examples of combinations of use of the various preceding-stage weighing conveyors 1 and the subsequent-stage weighing conveyors 2 in the weighing conveyor device 100.

  The clamp switching mechanisms 5 and 6 can be any of the following first-stage weighing conveyor load transmission mode (first partial load transmission mode), rear-stage weighing conveyor load transmission mode (second partial load transmission mode), full-load transmission mode, and no-load mode. Is set to one.

  FIG. 4 is a diagram schematically showing the state of the pre-stage weighing conveyor load transmission mode of the clamp switching mechanism.

  FIG. 5 is a diagram schematically showing the state of the latter-stage weighing conveyor load transmission mode of the clamp switching mechanism.

  FIG. 6 is a diagram schematically illustrating the state of the full load transmission mode of the clamp switching mechanism.

  FIG. 7 is a diagram schematically illustrating the state of the clamp switching mechanism in the no-load mode.

  4, 5, 6, and 7, the mode operation of the configuration of the weighing conveyor device 100 (for example, the front and rear weighing conveyors 1 and 2 and the clamp switching mechanisms 5 and 6) is understood. For simplicity, the illustration is simplified or omitted.

  First, the pre-stage weighing conveyor load transmission mode of the clamp switching mechanisms 5 and 6 will be described.

  As understood from the contents of FIG. 4, the meshing between the sector gear 15a and the disc gear 8a is released by the forward / reverse interlocking operation of the sector gear 15a and the disc gear 8a of the clamp switching mechanism 5. In this case, the lower rotation rod 11a of the clamp switching mechanism 5 and the conveyor support 9a are connected so that the load of the preceding weighing conveyor 1 is transmitted to the load cell LC (the upper rotation rod 10a of the clamp switching mechanism 5). And the conveyor support 9a are uncoupled).

  On the other hand, when the fan gear 15b and the disk gear 8b are engaged by the forward / reverse interlocking operation of the fan gear 15b and the disk gear 8b of the clamp switching mechanism 6, the clamp switching mechanism 6 The upper rotation rod 10b of the clamp switching mechanism 6 and the conveyor support 9b are connected so that the load of the rear weighing conveyor 2 is not transmitted to the load cell LC (the lower rotation rod 11b of the clamp switching mechanism 6 and the conveyor support 9b). Is unlinked).

  Thereby, when the article length of the article P placed on the weighing conveyor device 100 is a dimension suitable for weighing only by the former-stage weighing conveyor 1, for example, the article length of the article P is shorter than the conveyor length of the former-stage weighing conveyor 1. In this case, according to this first-stage weighing conveyor load transmission mode, the load of the article P is preferably transmitted from the first-stage weighing conveyor 1 only to the load cell LC via the clamp switching mechanisms 5 and 6.

  Further, as described above, when the meshing between the fan-shaped gear 15a and the disk-shaped gear 8a is released, the clamp switching mechanism 5 transmits the load on the preceding weighing conveyor so that the load of the preceding weighing conveyor 1 is transmitted to the load cell LC. Since the mode is set, the mutual contact based on the meshing between the fan-shaped gear 15a and the disk-shaped gear 8a can be appropriately cut off when the load cell LC detects the load of the article P placed on the preceding weighing conveyor 1. As a result, it is preferable that the load of the article P is accurately detected by the load cell LC.

  Next, the latter-stage weighing conveyor load transmission mode will be described.

  As understood from the contents of FIG. 5, the engagement between the sector gear 15 a and the disc gear 8 a is achieved by the forward / reverse interlocking operation of the sector gear 15 a and the disc gear 8 a of the clamp switching mechanism 5. In this case, the upper rotating rod 10a of the clamp switching mechanism 5 and the conveyor support 9a are connected so that the load of the preceding weighing conveyor 1 is not transmitted to the load cell LC (the lower rotating rod 11a of the clamp switching mechanism 5 and the conveyor). The connection with the support 9a is released).

  On the other hand, when the engagement between the sector gear 15b and the disc gear 8b is released by the forward / reverse interlocking operation of the sector gear 15b and the disc gear 8b of the clamp switching mechanism 6, the clamp switching mechanism 6 The lower rotation rod 11b of the clamp switching mechanism 6 and the conveyor support 9b are connected so that the load of the rear weighing conveyor 2 is transmitted to the load cell LC (the upper rotation rod 10b of the clamp switching mechanism 6 and the conveyor support). The connection with the tool 9b is released).

  Thereby, when the article length of the article P placed on the weighing conveyor device 100 is a dimension suitable for weighing only by the latter-stage weighing conveyor 2, for example, the article length of the article P is longer than the conveyor length of the former-stage weighing conveyor 1. In the case where the conveyor length of the latter-stage weighing conveyor 2 is shorter, the load on the article P is transmitted from only the latter-stage weighing conveyor 2 to the load cell LC via the clamp switching mechanisms 5 and 6 according to this latter-stage weighing conveyor load transmission mode. It is preferable.

  Further, as described above, when the meshing between the sector gear 15b and the disk gear 8b is released, the clamp switching mechanism 6 is set so that the load of the rear weighing conveyor 2 is transmitted to the load cell LC. Since the transmission mode is set, the mutual contact based on the meshing between the fan-shaped gear 15b and the disk-shaped gear 8b can be appropriately cut off when the load cell LC detects the load of the article P placed on the subsequent weighing conveyor 2. As a result, it is preferable that the load of the article P is accurately detected by the load cell LC.

  Next, the full load transmission mode of the clamp switching mechanisms 5 and 6 will be described.

  As understood from the contents of FIG. 6, the meshing between the fan gear 15a and the disk gear 8a is released by the forward / reverse interlocking operation of the fan gear 15a and the disk gear 8a of the clamp switching mechanism 5. In this case, the lower rotation rod 11a of the clamp switching mechanism 5 and the conveyor support 9a are connected so that the load of the preceding weighing conveyor 1 is transmitted to the load cell LC (the upper rotation rod 10a of the clamp switching mechanism 5). And the conveyor support 9a are uncoupled).

  On the other hand, when the engagement between the sector gear 15b and the disc gear 8b is released by the forward / reverse interlocking operation of the sector gear 15b and the disc gear 8b of the clamp switching mechanism 6, the clamp switching mechanism 6 The lower rotation rod 11b of the clamp switching mechanism 6 and the conveyor support 9b are connected so that the load of the rear weighing conveyor 2 is transmitted to the load cell LC (the upper rotation rod 10b of the clamp switching mechanism 6 and the conveyor support). The connection with the tool 9b is released).

  Accordingly, when the article length of the article P placed on the weighing conveyor device 100 is a size suitable for weighing by both the former-stage weighing conveyor 1 and the latter-stage weighing conveyor 2, for example, the article length of the article P is changed to the latter-stage weighing conveyor 2 In this full load transmission mode, the load of the article P is transmitted from both the preceding weighing conveyor 1 and the latter weighing conveyor 2 to the load cell LC via the clamp switching mechanisms 5 and 6. It is.

  In addition, as described above, when the meshing between the sector gear 15a and the disk gear 8a and between the sector gear 15b and the disk gear 8b is released, the first-stage weighing conveyor 1 and the latter-stage weighing conveyor. Since the clamp switching mechanisms 5 and 6 are set to the full load transmission mode so that the load 2 is transmitted to the load cell LC, the load cell LC detects the load of the article P placed on the preceding weighing conveyor 1 and the latter weighing conveyor 2. Sometimes, mutual contact based on the meshing between the fan-shaped gear 15a and the disk-shaped gear 8a and the meshing between the fan-shaped gear 15b and the disk-shaped gear 8b can be appropriately cut off. As a result, it is preferable that the load of the article P is accurately detected by the load cell LC.

  Next, the no-load mode of the clamp switching mechanisms 5 and 6 will be described.

  As understood from the contents of FIG. 7, the engagement between the sector gear 15a and the disc gear 8a is achieved by the forward / reverse interlocking operation of the sector gear 15a and the disc gear 8a of the clamp switching mechanism 5. In this case, the upper rotating rod 10a of the clamp switching mechanism 5 and the conveyor support 9a are connected so that the load of the preceding weighing conveyor 1 is not transmitted to the load cell LC (the lower rotating rod 11a of the clamp switching mechanism 5 and the conveyor). The connection with the support 9a is released).

  On the other hand, when the fan gear 15b and the disk gear 8b are engaged by the forward / reverse interlocking operation of the fan gear 15b and the disk gear 8b of the clamp switching mechanism 6, the clamp switching mechanism 6 The upper rotation rod 10b of the clamp switching mechanism 6 and the conveyor support 9b are connected so that the load of the rear weighing conveyor 2 is not transmitted to the load cell LC (the lower rotation rod 11b of the clamp switching mechanism 6 and the conveyor support 9b). Is unlinked).

  As a result, when the pre-stage weighing conveyor 1 and the rear-stage weighing conveyor 2 are overloaded due to carelessness of an operator unaccustomed to handling the weighing conveyor apparatus 100 while the operation of the weighing conveyor apparatus 100 is stopped, for example, an extreme overload Even when the item is placed on the weighing conveyor, the load cell LC can be prevented from being damaged.

  Next, an example of the load detection operation of the article P by the weighing conveyor device 100 of the present embodiment will be described with reference to the drawings.

  FIG. 8 is a diagram illustrating an operation example of load detection of an article by the weighing conveyor device when the article length of the article is shorter than the conveyor length of the preceding weighing conveyor.

  FIG. 9 is a diagram for explaining an operation example of load detection of an article by the weighing conveyor device when the article length of the article is longer than the conveyor length of the former-stage weighing conveyor and shorter than the conveyor length of the latter-stage weighing conveyor.

  FIG. 10 is a diagram for explaining an operation example of load detection of an article by the weighing conveyor device when the article length of the article is longer than the conveyor length of the subsequent weighing conveyor.

  8, 9, and 10, the operation of the configuration of the weighing conveyor device 100 (for example, the front and rear weighing conveyors 1 and 2 and the clamp switching mechanisms 5 and 6) is easily understood. The illustration is simplified or omitted.

  8, 9, and 10, the feeding conveyor 110 is illustrated in front of the front-stage weighing conveyor 1, and the feeding conveyor 111 is illustrated behind the rear-stage weighing conveyor 1. As described above, the feeding conveyor 110 is illustrated. The delivery conveyor 111 is well known, and a detailed description of these conveyors 110 and 111 is omitted here.

  According to FIG. 8, a plurality of articles P whose lengths in the front-rear direction (the conveyance direction of the articles P) are shorter than the conveyor length of the preceding weighing conveyor 1 are fed into the feeding conveyor 110, the preceding weighing conveyor 1, the latter weighing conveyor 2, and the delivery. On the conveyance line comprised by the conveyor 111, it conveys by 5 pieces so that a predetermined space | interval may be continued.

  Note that the article length of the article P is input to the storage unit 105 in advance based on an operation performed by the operator's operation setting display unit 102 (type registration work of the article P).

  If the above-mentioned predetermined interval exceeds the weighing section t1 described later, the load of each article P can be detected. However, considering the transport error of the weighing conveyor device 100 and the like, this load is longer than the conveyor length of the preceding weighing conveyor 1 It is preferable to set a predetermined interval.

  In this case, the control device 101 (motor control circuit 106) gives a predetermined operation parameter to the rotary motors 3a and 3b based on the article length of the article P stored in the storage unit 105 in advance, thereby the clamp switching mechanism. 5 and 6 are set to the pre-stage weighing conveyor load transmission mode.

  This operation parameter is used to set the clamp switching mechanisms 5 and 6 in one of the respective modes (front-stage weighing conveyor load transmission mode, rear-stage weighing conveyor load transmission mode, full-load transmission mode, and no-load mode). The drive parameters of the rotary motors 3a and 3b stored in the storage unit 105 in advance are indicated.

  When the front end of the article P is detected by the photoelectric tube 26 installed at the entrance (front end) of the front-stage weighing conveyor 1, the control device 101 reads the conveyance speed V of the article P and the article P stored in the storage unit 105 in advance. Based on the article length, the preparation period from when the detection signal of the photoelectric tube 26 is received until the rear end of the article P is transferred to the front weighing conveyor 1 is calculated as in the second article P from the front of FIG. . A weighing section t1 from when the entire article P is completely transferred to the preceding weighing conveyor 1 until the leading end of the article P reaches the outlet (rear end) of the preceding weighing conveyor 1 is on the preceding weighing conveyor 1. It is known that the article P can be conveyed most stably and the load of the article P can be accurately measured. Therefore, the control device 101 derives the timing at which the tip of the article P exists in the weighing section t1 based on this preparation period, and outputs from the load cell LC by the load transmission of the article P on the preceding weighing conveyor 1 within the timing. The analog signal to be processed is A / D converted by the A / D converter 103, and the converted digital signal is stored in the storage unit 105 as the weight data of the article P.

  In addition, according to FIG. 9, a plurality of articles P whose length in the front-rear direction (the conveyance direction of the articles P) is longer than the conveyor length of the former-stage weighing conveyor 1 and shorter than the conveyor length of the latter-stage weighing conveyor 2 are fed. On the transfer line constituted by the conveyor 110, the former-stage weighing conveyor 1, the latter-stage weighing conveyor 2, and the delivery conveyor 111, three pieces are conveyed continuously at a predetermined interval.

  Note that the article length of the article P is input to the storage unit 105 in advance based on an operation performed by the operator's operation setting display unit 102 (type registration work of the article P).

  If the above-mentioned predetermined interval exceeds the weighing section t2 described later, the load of each article P can be detected. However, in consideration of the conveyance error of the weighing conveyor device 100 and the like, this load exceeds the conveyor length of the latter weighing conveyor 2. It is preferable to set a predetermined interval.

  In this case, the control device 101 (motor control circuit 106) gives a predetermined operation parameter to the rotary motors 3a and 3b based on the article length of the article P stored in the storage unit 105 in advance, thereby the clamp switching mechanism. 5 and 6 are set to the latter-stage weighing conveyor load transmission mode.

  When the front end of the article P is detected by the photoelectric tube 27 installed at the entrance (front end) of the rear-stage weighing conveyor 2, the control device 101 detects the conveyance speed V of the article P and the article P stored in the storage unit 105 in advance. Based on the article length, a preparation period is calculated from the time when the detection signal of the photoelectric tube 27 is received until the rear end of the article P is transferred to the rear weighing conveyor 2, as in the middle article P in FIG. Then, the weighing section t2 from when the entire article P is completely transferred to the latter weighing conveyor 2 until the front end of the article P reaches the outlet (rear end) of the latter weighing conveyor 2 is on the latter weighing conveyor 2. It is known that the article P can be conveyed most stably and the load of the article P can be accurately measured. For this reason, the control device 101 derives the timing at which the tip of the article P exists in the weighing section t2 based on this preparation period, and outputs from the load cell LC by the load transmission of the article P on the subsequent weighing conveyor 2 within the timing. The analog signal to be processed is A / D converted by the A / D converter 103, and the converted digital signal is stored in the storage unit 105 as weight data of the article P.

  Further, according to FIG. 10, a plurality of articles P whose length in the front-rear direction (conveying direction of the article P) is longer than the conveyor length of the rear-stage weighing conveyor 2 are fed into the feed conveyor 110, the front-stage weighing conveyor 1, and the rear-stage weighing conveyor 2. On the conveying line constituted by the delivery conveyor 111, the conveying line 111 is conveyed so as to be continuous at a predetermined interval. However, in FIG. 10, since the article P has a long article length, only one article P is illustrated for convenience of drawing.

  Note that the article length of the article P is input to the storage unit 105 in advance based on an operation performed by the operator's operation setting display unit 102 (type registration work of the article P).

  If the above-mentioned predetermined interval exceeds a later-described weighing section t3, the load of each article P can be detected. However, the conveyor length of the first-stage weighing conveyor 1 and the latter-stage weighing conveyor are taken into consideration in consideration of the conveyance error of the weighing conveyor device 100 and the like. It is preferable to set the predetermined interval to be equal to or greater than the addition distance of the two conveyor lengths.

  In this case, the control device 101 (motor control circuit 106) gives a predetermined operation parameter to the rotary motors 3a and 3b based on the article length of the article P stored in the storage unit 105 in advance, thereby the clamp switching mechanism. 5 and 6 are set to the full load transmission mode.

  When the front end of the article P is detected by the photoelectric tube 26 installed at the entrance (front end) of the front-stage weighing conveyor 1, the control device 101 reads the conveyance speed V of the article P and the article P stored in the storage unit 105 in advance. Based on the article length, a preparation period is calculated from the time when the detection signal of the photoelectric tube 26 is received until the rear end of the article P is transferred to the preceding weighing conveyor 1 as in the article P of FIG. A weighing section t3 from when the entire article P is completely transferred to the front and rear weighing conveyors 1 and 2 until the front end of the article P reaches the outlet (rear end) of the latter weighing conveyor 2 is a front stage. It is also known that the article P on the second weighing conveyors 1 and 2 can be conveyed most stably and the load of the article P can be accurately measured. For this reason, the control device 101 derives the timing at which the tip of the article P exists in the weighing section t3 based on the preparation period, and the load of the article P on the front and rear weighing conveyors 1 and 2 is transmitted within the timing. The analog signal output from the load cell LC is A / D converted by the A / D converter 103 and the converted digital signal is stored in the storage unit 105 as the weight data of the article P.

  Although not shown here, when the operation of the weighing conveyor device 100 is stopped (that is, when the operation ON-OFF switch of the weighing conveyor device 100 is turned OFF), the control device 101 (motor control) The circuit 106) gives predetermined operating parameters to the rotary motors 3a and 3b, whereby the clamp switching mechanisms 5 and 6 are set to the no-load mode.

  As described above, the weighing conveyor device 100 according to the present embodiment detects the loads of the preceding and succeeding weighing conveyors 1 and 2 having different conveyor lengths and the preceding and following weighing conveyors 1 and 2 on which the article P is placed. One possible load cell LC is arranged in the middle of the load transmission path of the article P between the front and rear weighing conveyors 1, 2 and the load cell LC, and the front and rear weighing conveyors 1, 2 are connected to the load cell LC. Clamp switching mechanisms 5 and 6 for controlling load transmission.

  For this reason, according to this weighing conveyor apparatus 100, according to the article length of the article P which is an object to be weighed, the load of the article P placed on the front and rear weighing conveyors 1 and 2 is controlled by the clamp switching mechanisms 5 and 6. The transmission control to the load cell LC can be performed appropriately. That is, in the weighing conveyor device 100 of this embodiment, various articles (for example, articles having various article lengths) can be weighed by one load cell LC, and as a result, versatility and reliability of the weighing conveyor apparatus 100 are increased.

  In addition, according to the weighing conveyor device 100, when the weighing conveyor device 100 is stopped, the clamp switching mechanisms 5 and 6 do not transmit the load of the articles placed on the front and rear weighing conveyors 1 and 2 to the load cell LC. The no-load mode can be set.

  For this reason, in the weighing conveyor device 100 of the present embodiment, the load transmission to the load cell LC is appropriately prevented during the operation stop of the weighing conveyor device 100. As a result, damage due to an unexpected overload to the load cell LC or the like. Can remove the root factor.

  For example, when the pre-stage weighing conveyor 1 or the rear-stage weighing conveyor 2 is overloaded due to carelessness of an operator unaccustomed to handling the weighing conveyor apparatus 100 while the operation of the weighing conveyor apparatus 100 is stopped, for example, an excessive amount of Even when an object is placed on the weighing conveyor, the load cell LC can be prevented from being damaged.

  Here, an example is described in which the article length of the article P is input to the storage unit 105 in advance based on an operation (product type registration work of the article P) by the operation setting display unit 102 of the operator. In the case of a weighing line whose length changes frequently and randomly, the control device 101 automatically acquires the article length of the article P measured by an appropriate detection means, and clamps based on this article length. The clamp switching operation of the switching mechanisms 5 and 6 may be executed.

  According to the weight sorter of the present invention, versatility and reliability are improved, and it can be used as a device that distributes articles for each load.

It is the schematic which showed one structural example of the weighing conveyor apparatus of embodiment of this invention, and is the figure which looked at the weighing conveyor apparatus from the side (left-right direction). It is sectional drawing of the weighing conveyor apparatus along the II-II line of FIG. It is sectional drawing of the clamp switching mechanism and conveyor support along the III-III line | wire of FIG. It is the figure which showed typically the state of the front | former stage measurement conveyor load transmission mode of a clamp switching mechanism. It is the figure which showed typically the state of the back | latter stage measurement conveyor load transmission mode of a clamp switching mechanism. It is the figure which showed typically the state of the full load transmission mode of a clamp switching mechanism. It is the figure which showed typically the state of the no load mode of the clamp switching mechanism. It is a figure explaining the operation example of the load detection of the articles | goods by a weighing conveyor apparatus when the article length of an article | item is shorter than the conveyor length of a front | former stage weighing conveyor. It is a figure explaining the operation example of the load detection of the articles | goods by a weighing conveyor apparatus when the article length of an article is longer than the conveyor length of a front | former stage weighing conveyor, and shorter than the conveyor length of a back | latter stage weighing conveyor. It is a figure explaining the operation example of the load detection of the articles | goods by a measurement conveyor apparatus when the article length of an article is longer than the conveyor length of a back | latter stage measurement conveyor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front stage conveyor 1a, 2a Drive roller 1b, 2b Driven roller 1c, 2c Belt 1d, 2d Motor 2 Rear stage conveyor 3a, 3b Rotary motor 5, 6 Clamp switching mechanism 7a, 7b Conveyor support bracket 8a, 8b Disk type gear 9a , 9b Conveyor support 9c, 9d, 9e, 9f Recessed portion 10a, 10b Upper rotating rod 11a, 11b Lower rotating rod 13a, 14a 13b, 14b Guide rod 13c, 13d Nut 15a, 15b Fan-shaped gear 16a, 17a Left clamp straight line Moving body 18a, 19a Right clamp linear moving body 16a-1, 17a-1 Left pawl support 18a-1, 19a-1 Right pawl support 16a-2, 17a-2, Left main body 18a-2, 19a-2 , Right main body 21, 22, 33, 34 bearing 26, 27 phototube 40, 41 right screw Parts 42 and 43 Left screw part 50 Spring 51 Guide fulcrum member 100 Weighing conveyor device 101 Control device 102 Operation setting display part 103 A / D converter 104 CPU
105 Storage Unit 106 Motor Control Circuit 110 Feeding Conveyor 111 Sorting Conveyor B Support Pedestal Structure B1 Unloaded Support Pedestal B2 Loaded Pedestal Base LC Load Cell P Articles t1, t2, t3 Weighing Section V Conveying Speed

Claims (10)

First conveying means for conveying an article;
A load detector for detecting a load of the first conveying means in a state where an article is placed;
A first clamp switching mechanism that is disposed in the middle of a load transmission path between the first conveyance unit and the load detector and controls load transmission from the first conveyance unit to the load detector; A weight sorter that includes a weighing device and distributes the article based on a load of the article by the weighing device. A second conveying means for conveying an article having a conveying length longer than the conveying length of the first conveying means;
A second clamp switching mechanism that is disposed in the middle of a load transmission path between the second conveying means and the load detector and controls load transmission from the second conveying means to the load detector. ,
The weight sorter according to claim 1, wherein a load of the second conveying means in a state where an article is placed is detected by the load detector. The first and second clamp switching mechanisms are set to any one of a full load transmission mode, a no-load mode, a first partial load transmission mode, and a second partial load transmission mode,
In the full load transmission mode, the loads of both the first and second transport means are transmitted to the load detector by the first and second clamp switching mechanisms.
In the first partial load transmission mode, the load of only the first conveying means is transmitted to the load detector by the first and second clamp switching mechanisms.
In the second partial load transmission mode, the load of only the second transport means is transmitted to the load detector by the first and second clamp switching mechanisms.
3. The weight sorter according to claim 2, wherein, in the no-load mode, the loads of the first and second transporting units are not transmitted to the load detector by the first and second clamp switching mechanisms. A storage unit that stores an article length of the article, a drive device that drives the first and second clamp switching mechanisms, and a control device,
When the load of the article is detected by the load detector, an operation parameter for controlling the driving of the driving device based on the article length of the article is given to the driving device by the control device,
The first and second clamp switching mechanisms are any one of the full load transmission mode, the first partial load transmission mode, and the second partial load transmission mode by driving the driving device based on the operation parameter. The weight sorter according to claim 3, which is set to When the article length of the article is shorter than the conveying length of the first conveying means, the first and second clamp switching mechanisms are set to the first partial load transmission mode,
When the article length of the article is longer than the conveying length of the first conveying means and shorter than the conveying length of the second conveying means, the first and second clamp switching mechanisms are configured to use the second partial load. Set to transmission mode,
The weight sorter according to claim 4, wherein when the article length of the article is longer than the conveyance length of the second conveyance means, the first and second clamp switching mechanisms are set to the full load transmission mode. A drive device for driving the first and second clamp switching mechanisms, and a control device;
When the operation of the weight sorter is stopped, the control device gives an operation parameter for controlling the drive of the drive device to the drive device,
4. The weight sorter according to claim 3, wherein the first and second clamp switching mechanisms are set to the no-load mode by driving a driving device based on the operation parameter. The first clamp switching mechanism includes two or more movable units that enable establishment and release of a connection to a support that supports the first transport unit,
The weight sorter according to claim 1, wherein the first movable unit is supported by a pedestal for no load, and the second movable unit is supported by a pedestal for load placed on the load detector. . The first movable unit includes a sector gear connected to a first rotating rod,
The second movable unit includes a disk-shaped gear connected to a second rotating rod and meshing with teeth of the fan-shaped gear;
When the meshing between the sector gear and the disk gear is released by the rotation of the sector gear, a connection between the second movable unit and the support is established, and the first 1 The connection between the movable unit and the support is released,
When the fan gear and the disk gear are engaged by the rotation of the fan gear, the connection between the first movable unit and the support is established, and the second The weight sorter according to claim 7, wherein the connection between the movable unit and the support is released.   The weight sorter according to claim 8, further comprising a driving device that rotates the first rotating rod.   The weight sorter according to claim 8, further comprising a manual lever for rotating the first rotating rod.

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