JP2010032217A - Weight checker and carrying apparatus with the same - Google Patents

Weight checker and carrying apparatus with the same Download PDF

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JP2010032217A
JP2010032217A JP2008191401A JP2008191401A JP2010032217A JP 2010032217 A JP2010032217 A JP 2010032217A JP 2008191401 A JP2008191401 A JP 2008191401A JP 2008191401 A JP2008191401 A JP 2008191401A JP 2010032217 A JP2010032217 A JP 2010032217A
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conveyor
article
transport
belt
roller
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Katsuyuki Furukawa
勝行 古川
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Ishida Co Ltd
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Ishida Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a weight checker for measuring a weight while an article is carried, suppressing a degradation in a measurement capability due to a change in a length of the to-be-measured article, and ensuring the measurement accuracy, and a carrying apparatus with it. <P>SOLUTION: The weight checker includes: an article carrying plane expanding/contracting means for relatively displacing a carrying roller in the approach direction or the separation direction, and expanding or contracting an article carrying plane; a tension applying roller provided so as to be separated from the carrying roller, and applying a tension to a carrying belt; and a belt tension adjusting means for displacing the tension applying roller, and absorbing an excess and a deficiency in a length of the carrying belt due to an expansion and a contraction of the article carrying plane. The article carrying plane can be expanded or contracted in response to the length of the to-be-measured article. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、物品を搬送しながら重量計量する重量チェッカ及びそれを備える搬送装置に関する。   The present invention relates to a weight checker that weighs an article while conveying the article, and a conveying apparatus including the weight checker.

従来、物品製造工程で物品重量を検査するため、物品を搬送する搬送コンベアとこれを支持する重量センサを備え、重量センサの検出結果に基づいて物品重量を個別計量する重量チェッカが採用されている。かかる物品製造工程において大きさが異なる物品を製造する場合、重量計量が行われる搬送コンベア上には、物品を一つずつ、かつ物品全体を載せる必要があり、そのため、物品搬送方向における物品長が最も大きい物品に合わせて搬送面長さが設定される。例えば、最大物品長が70cmであれば、重量センサから出力される重量計量信号の安定時間を考慮して、搬送面長さを少し大きめの80cmに設定したうえで、搬送間隔(先行して搬送される物品の後端と、その直後に搬送される物品の前端の距離。以下同じ。)を10cm以上確保することになる。   Conventionally, in order to inspect the weight of an article in an article manufacturing process, a weight checker that includes a transport conveyor that transports an article and a weight sensor that supports the conveyor and individually measures the weight of the article based on the detection result of the weight sensor has been employed. . When manufacturing articles of different sizes in such an article manufacturing process, it is necessary to place the articles one by one and the entire article on the transport conveyor on which the weight is measured. The length of the conveyance surface is set according to the largest article. For example, if the maximum article length is 70 cm, the transport surface length is set to a slightly larger 80 cm in consideration of the stabilization time of the weight measurement signal output from the weight sensor, and then the transport interval (advance transport in advance). The distance between the rear end of the article to be transported and the front end of the article transported immediately thereafter (the same shall apply hereinafter) is secured at least 10 cm.

しかしながら、同じ物品製造工程で物品長10cmの物品を製造して、重量計量する場合には、重量計量を行う搬送コンベアに対して同時に二以上の物品が載らないように、70cm以上の大きな搬送間隔を確保する必要があり、その結果、計量能力(単位時間当たりの計量処理可能な物品数)が著しく低下するという問題を生じる。この問題の解決手段としては、重量センサで支持される搬送コンベアであって搬送面長さが小さいものを複数台、物品搬送方向に直列配置してなる重量チェッカが提案されている(例えば、特許文献1参照。)。   However, when an article having an article length of 10 cm is manufactured and weighed in the same article manufacturing process, a large conveyance interval of 70 cm or more is provided so that two or more articles are not placed on the conveyor for performing the weighing. As a result, there is a problem in that the weighing capacity (the number of articles that can be weighed per unit time) is significantly reduced. As a means for solving this problem, there has been proposed a weight checker in which a plurality of transport conveyors supported by a weight sensor and having a small transport surface length are arranged in series in the article transport direction (for example, a patent) Reference 1).

この重量チェッカで物品長が大きい物品を重量計量する場合には、当該物品を同時に載置可能な搬送面長さを確保できるように、複数の搬送コンベアを組み合わせて、それらの重量センサからの計量信号に基づく計量重量を合算して、その物品重量を計量する。また、物品長が小さい物品を重量計量する場合には、当該物品を載置可能な搬送面長さの小さい搬送コンベアを選択し、その重量センサからの計量信号のみに基づき物品重量を計量する。すなわち、この重量チェッカによれば、物品長に応じて適切な搬送面長さを設定することができ、計量能力の低下を抑えることができる。
特開平10−122940号公報
When weighing an article with a large article length with this weight checker, we combine multiple conveyors and weigh from these weight sensors so that the conveyance surface length on which the article can be placed simultaneously can be secured. The weight of the article is weighed by adding the weights based on the signals. Further, when weighing an article having a small article length, a conveyance conveyor having a small conveyance surface on which the article can be placed is selected, and the article weight is measured based only on a weighing signal from the weight sensor. That is, according to this weight checker, an appropriate conveyance surface length can be set according to the article length, and a decrease in weighing capacity can be suppressed.
JP-A-10-122940

しかしながら、上記重量チェッカのように、搬送コンベア及び重量センサを複数組み合わせて使用する場合には、以下のような問題を生じる。まず、重量センサは、非常に高価であり、かつ、その維持のために定期的に点検・校正する必要があるところ、これを複数使用することにより、製造コスト及び維持コストが非常に高くなるという問題がある。また、物品搬送間隔を十分に詰めて計量能力低下の問題を解消しようとする場合、計量対象物品の物品長の組み合わせによっては、装置全体が長くなり過ぎるという問題がある。   However, when using a combination of a plurality of conveyors and weight sensors like the weight checker, the following problems occur. First, the weight sensor is very expensive, and it is necessary to periodically inspect and calibrate it to maintain it. By using multiple weight sensors, the manufacturing and maintenance costs are very high. There's a problem. Moreover, when trying to solve the problem of a decrease in weighing capacity by sufficiently narrowing the article conveyance interval, there is a problem that the entire apparatus becomes too long depending on the combination of article lengths of articles to be weighed.

例えば、計量対象物品の物品長が10、30、40、70cmで、各物品の搬送間隔をすべて10cmに設定する場合、各物品に対して最適な搬送面長さは、20、40、50、80cmで、これらを同時に満足させると、装置全長が長くなり過ぎる。なお、搬送面長さ40cmのコンベア二本、あるいは30cmのコンベア一本と50cmのコンベア一本とすれば、装置全長は80cmに抑えられるが、搬送間隔を20cmや30cmに設定せざる得ない場合を生じる。   For example, when the article length of the object to be weighed is 10, 30, 40, 70 cm and the conveyance intervals of each article are all set to 10 cm, the optimum conveyance surface length for each article is 20, 40, 50, If these are satisfied simultaneously at 80 cm, the total length of the apparatus becomes too long. If two conveyors with a transport surface length of 40 cm, or one conveyor with 30 cm and one conveyor with 50 cm, the overall length of the device can be suppressed to 80 cm, but the transport interval must be set to 20 cm or 30 cm. Produce.

さらに、複数の搬送コンベアに跨る一つの物品を各搬送コンベアの重量センサで計量する場合、物品搬送に伴って各重量センサに負荷される重量が常時変動するため、各重量センサにおける重量計量信号が安定しにくく、計量精度を確保することが難しいという問題がある。   Furthermore, when one article straddling a plurality of conveyors is weighed by the weight sensor of each conveyor, the weight applied to each weight sensor always varies with the conveyance of the article, so the weight measurement signal at each weight sensor is There is a problem that it is difficult to stabilize and it is difficult to ensure measurement accuracy.

本願発明は、上記の事情に鑑みて、物品を搬送しながら重量計量する重量チェッカにおいて、計量対象物品の物品長の変更に伴う計量能力の低下を抑えながら、計量精度を確保することができる重量チェッカ及びそれを備える搬送装置を提供する。   In view of the above circumstances, the invention of the present application is a weight checker that weighs an article while transporting the article, and is capable of ensuring weighing accuracy while suppressing a decrease in weighing ability accompanying a change in the article length of the article to be weighed. Provided are a checker and a transport apparatus including the checker.

請求項1記載の発明は、物品を搬送する搬送コンベアと、該搬送コンベアを支持する重量センサと、を備え、前記重量センサの検出結果に基づき前記搬送コンベアで搬送中の物品を重量計量する重量チェッカにおいて、
前記搬送コンベアは、第一搬送ローラと、第二搬送ローラと、これらの両搬送ローラに巻き掛けられて、前記両搬送ローラ間に物品搬送面を形成する搬送ベルトと、前記両搬送ローラを接近又は離間する方向に相対変位させることにより、前記両搬送ローラ間の距離を変化させて、前記物品搬送面を伸縮する物品搬送面伸縮手段と、前記両搬送ローラとは別に設けられて、前記搬送ベルトに押接されることにより、前記搬送ベルトに張力を付与する張力付与ローラと、前記張力付与ローラを変位させることにより、前記物品搬送面の伸縮に伴う搬送ベルト長さの過不足を吸収するベルト張力調整手段と、を備え、
重量計量する物品の長さに応じて、前記物品搬送面を伸縮可能にしたことを特徴とする重量チェッカを提供する。
The invention according to claim 1 includes a transport conveyor for transporting an article and a weight sensor for supporting the transport conveyor, and the weight for weighing the article being transported by the transport conveyor based on a detection result of the weight sensor. In checker
The conveyor conveys a first conveyor roller, a second conveyor roller, a conveyor belt that is wound around both the conveyor rollers and forms an article conveyance surface between the conveyor rollers, and the conveyor rollers approach each other. Alternatively, the article conveying surface expansion / contraction means for extending / contracting the article conveying surface by changing the distance between the two conveying rollers by relative displacement in the separating direction and the both conveying rollers are provided separately from the conveying rollers. A tension applying roller that applies tension to the conveying belt by being pressed against the belt, and a displacement of the tension applying roller absorbs excess and deficiency of the conveying belt length due to expansion and contraction of the article conveying surface. Belt tension adjusting means,
There is provided a weight checker characterized in that the article conveying surface can be expanded and contracted according to the length of an article to be weighed.

請求項2記載の発明は、請求項1記載の重量チェッカであって、
前記物品搬送面伸縮手段は、前記両搬送ローラを反対方向に同じ距離を変位させることを特徴とする重量チェッカを提供する。
The invention according to claim 2 is the weight checker according to claim 1,
The article conveying surface expansion / contraction means provides a weight checker characterized in that both conveying rollers are displaced by the same distance in opposite directions.

請求項3記載の発明は、請求項1又は2記載の重量チェッカを備える搬送装置であって、
前記重量チェッカへ物品を搬入する搬入コンベア及び/又は前記重量チェッカから物品を搬出する搬出コンベアを、前記搬送コンベアの物品搬送方向の手前側及び/又は向う側に配置されてなり、前記搬入コンベア及び/又は前記搬出コンベアを、前記物品搬送面の伸縮動作に同期して、前記搬送コンベアに接近又は離間させる方向に移動させることにより、前記搬送コンベアとの間隔を一定に保つ移動手段を備えることを特徴とする搬送装置を提供する。
Invention of Claim 3 is a conveying apparatus provided with the weight checker of Claim 1 or 2, Comprising:
A carry-in conveyor for carrying articles into the weight checker and / or a carry-out conveyor for carrying out articles from the weight checker are arranged on the front side and / or the opposite side of the carry conveyor in the article conveyance direction, and the carry-in conveyor and / or Alternatively, it comprises a moving means for keeping the distance from the conveyer constant by moving the carry-out conveyer in a direction of approaching or separating from the conveyer in synchronization with the expansion and contraction operation of the article conveying surface. A conveying device is provided.

請求項1記載の発明によれば、以下の優れた効果を奏する。搬送ベルトが巻き掛けられて物品搬送面を形成する搬送ローラを相互に接近又は離間させることにより、物品搬送面を伸縮する物品搬送面伸縮手段を設けるとともに、搬送ベルトに張力を付与する張力付与ローラを変位させることにより、物品搬送面伸縮手段の作動に伴う搬送ベルトの過不足を吸収させるようにしたので、搬送物品の物品長に応じて、物品搬送面長さを適正化することができ、計量能力の低下を解消することができる。また、単一の重量センサで異なる物品長に対応することができるため、製造コスト及び維持コストが抑えられることに加えて、重量計量信号を安定させ易く計量精度を悪化させる心配が無い。   According to invention of Claim 1, there exist the following outstanding effects. A tension applying roller that provides article conveying surface expansion / contraction means for extending / contracting the article conveying surface by applying or separating the conveying rollers forming the article conveying surface by winding the conveying belt, and applying tension to the conveying belt. , The excess and shortage of the conveyor belt associated with the operation of the article conveyor surface expansion and contraction means is absorbed, so that the article conveyor surface length can be optimized according to the article length of the conveyed article, The decrease in weighing capacity can be eliminated. In addition, since a single weight sensor can cope with different article lengths, the manufacturing cost and the maintenance cost can be suppressed, and the weight measurement signal can be easily stabilized and there is no fear of deteriorating the measurement accuracy.

請求項2記載の発明によれば、請求項1記載の発明の効果に加え、以下の優れた効果を奏する。物品搬送面伸縮手段が、両搬送ローラを物品搬送方向において前後対称に変位させるので、搬送コンベアを支持する重量センサに負荷される偏荷重を抑えることができ、その結果として、高い計量精度を確保することができる。   According to invention of Claim 2, in addition to the effect of invention of Claim 1, there exist the following outstanding effects. The article conveying surface expansion / contraction means displaces both conveying rollers symmetrically back and forth in the article conveying direction, so that it is possible to suppress the unbalanced load applied to the weight sensor that supports the conveying conveyor, and as a result, high weighing accuracy is ensured. can do.

請求項3記載の発明によれば、請求項1又は2記載の発明の効果に加え、以下の優れた効果を奏する。上記搬送コンベアの物品搬送方向の前後に隣接して配置される搬入コンベアや搬出コンベアを搬送コンベアの伸縮に同期して移動させることにより、搬送コンベアとの間隔を一定に保つ移動手段を備えるので、物品長の長さ変更に伴う対応を迅速に行うことができる。   According to invention of Claim 3, in addition to the effect of invention of Claim 1 or 2, there exist the following outstanding effects. Since it is provided with a moving means that keeps the interval between the transfer conveyor constant by moving the carry-in conveyor and the carry-out conveyor arranged adjacent to each other in the article transfer direction of the transfer conveyor in synchronization with the expansion and contraction of the transfer conveyor, It is possible to quickly deal with the change in the length of the article.

(本発明の第一の実施形態)
以下、本発明の第一の実施形態を、添付図面を参照しながら説明する。図1は、本実施形態に係る重量チェッカ1を示す図であって、(a)は物品搬送面Fを最も長く伸ばした状態、(b)は物品搬送面Fを最も短く縮めた状態を表す。
(First embodiment of the present invention)
Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings. 1A and 1B are diagrams showing a weight checker 1 according to the present embodiment, in which FIG. 1A shows a state in which the article transport surface F is extended the longest, and FIG. 1B shows a state in which the article transport surface F is shortened the shortest. .

(重量チェッカ1)
重量チェッカ1は、図1(a)及び(b)中の左側に設けられる物品搬入口INから物品を受け入れ、同図中の右側に設けられる物品搬出口EXへ向けて物品を搬送する搬送コンベア2と、搬送コンベア2を支持する重量センサ3と、を備えてなり、重量センサ3の検出結果に基づき、搬送コンベア2で搬送中の物品を重量計量する。
(Weight Checker 1)
The weight checker 1 receives an article from an article carry-in port IN provided on the left side in FIGS. 1A and 1B, and conveys the article toward an article carry-out port EX provided on the right side in FIG. 2 and a weight sensor 3 that supports the conveyor 2, and weighs articles being conveyed by the conveyor 2 based on the detection result of the weight sensor 3.

(搬送コンベア2)
搬送コンベア2は、図1(a)及び(b)に示されるように、コンベア後端の物品搬入口INに設けられる第一搬送ローラ21と、コンベア前端の物品搬出口EXに設けられる第二搬送ローラ22と、第一及び第二搬送ローラ21,22に巻き掛けられて、両搬送ローラ21,22間に物品搬送面Fを形成する搬送ベルト23と、を備えるベルトコンベアである。さらに、搬送コンベア2は、両搬送ローラ21,22を相互に接近又は離間する方向に相対変位させることにより、両搬送ローラ間の距離Lを、図1(a)に示す最長状態から、同図(b)に示す最短状態までの範囲で変化させて、物品搬送面Fを伸縮する物品搬送面伸縮手段24と、両搬送ローラ21,22とは別に設けられ、搬送ベルト23に押接されることにより、搬送ベルト23に張力を付与する張力付与ローラ25と、張力付与ローラ25を変位させることにより、物品搬送面Fの伸縮に伴う搬送ベルト23の長さの過不足を吸収するとともにベルト張力を調整するベルト張力調整手段26を備える。
(Conveyor 2)
As shown in FIGS. 1A and 1B, the transport conveyor 2 includes a first transport roller 21 provided at an article carry-in port IN at the rear end of the conveyor and a second feed port EX provided at an article carry-out port EX at the front end of the conveyor. The belt conveyor includes a conveyance roller 22 and a conveyance belt 23 that is wound around the first and second conveyance rollers 21 and 22 to form an article conveyance surface F between the conveyance rollers 21 and 22. Further, the conveyor 2 moves the distance between the conveying rollers 21 and 22 from the longest state shown in FIG. The article conveying surface expansion / contraction means 24 that expands and contracts the article conveying surface F by changing in the range up to the shortest state shown in (b) and the conveying rollers 21 and 22 are provided separately and pressed against the conveying belt 23. Thus, by displacing the tension applying roller 25 for applying tension to the conveying belt 23 and the tension applying roller 25, the excess or deficiency of the length of the conveying belt 23 accompanying the expansion and contraction of the article conveying surface F is absorbed and the belt tension. Belt tension adjusting means 26 is provided.

(第一搬送ローラ21及び第二搬送ローラ22)
第一搬送ローラ21は、物品搬送方向に延びる第一コンベアフレーム27の後端に軸受支持される従動ローラである。第二搬送ローラ22は、同じく物品搬送方向に延びる第二コンベアフレーム28の前端に軸受支持され、不図示のコンベア駆動モータにより回転駆動される駆動ローラである。第一コンベアフレーム27は、重量センサ3を介して重量チェッカ本体11に連結固定される一方、第二コンベアフレーム28は、第一コンベアフレーム27に対し、不図示のスライド機構によって物品搬送方向にスライド可能となるように支持され、これによって、両搬送ローラ21,22は、相互に接近又は離間する方向に相対変位可能とされる。なお、スライド機構は、両コンベアフレーム27,28の一方に連結固定されるレールと、他方に連結固定されて前記レールに対してスライド可能なスライダーとを備える。
(First transport roller 21 and second transport roller 22)
The 1st conveyance roller 21 is a driven roller bearing-supported by the rear end of the 1st conveyor frame 27 extended in an article conveyance direction. The second transport roller 22 is a drive roller that is supported by a bearing at the front end of the second conveyor frame 28 that also extends in the article transport direction and is rotationally driven by a conveyor drive motor (not shown). The first conveyor frame 27 is connected and fixed to the weight checker body 11 via the weight sensor 3, while the second conveyor frame 28 is slid in the article conveying direction with respect to the first conveyor frame 27 by a slide mechanism (not shown). By being supported so as to be able to do so, both the transport rollers 21 and 22 can be relatively displaced in a direction approaching or separating from each other. The slide mechanism includes a rail connected and fixed to one of the conveyor frames 27 and 28, and a slider connected and fixed to the other and slidable with respect to the rail.

(搬送ベルト23)
搬送ベルト23は、第一搬送ローラ21及び第二搬送ローラ22に巻き掛けられ、両搬送ローラ21,22間の上面側に物品を載せて搬送する物品搬送面Fを形成し、第二搬送ローラ22の回転駆動に伴って物品搬送方向に走行する。搬送ベルト23は、図1(a)及び(b)に示されるように、物品搬送面Fを形成した後、物品搬出口EXに設けられる第二搬送ローラ22でその下方側に回り込むように方向転換されて、重量センサ3との干渉を避けるように下方へ張り出した概ねコ字形状の迂回経路Rを走行させられ、さらに物品搬入口INに設けられる第一搬送ローラ21まで戻って、再び物品搬送面Fを形成する循環走行を繰り返す。なお、迂回経路Rには、後述する張力付与ローラ25やベルト張力調整手段26が設けられており、これらの作動によって、物品搬送面Fの伸縮に伴って生じる搬送ベルト23の長さの過不足を吸収する。
(Conveyor belt 23)
The conveyance belt 23 is wound around the first conveyance roller 21 and the second conveyance roller 22 to form an article conveyance surface F on which an article is placed and conveyed on the upper surface side between the conveyance rollers 21 and 22, and the second conveyance roller The vehicle travels in the article transporting direction with the rotational drive of 22. As shown in FIGS. 1 (a) and 1 (b), the conveyance belt 23 is formed so as to wrap around the lower side thereof by the second conveyance roller 22 provided at the article carry-out port EX after the article conveyance surface F is formed. In order to avoid the interference with the weight sensor 3, it is caused to travel along a substantially U-shaped detour path R that protrudes downward, and further returns to the first conveying roller 21 provided at the article carry-in port IN, and again the article. The circulating travel that forms the conveyance surface F is repeated. The detour path R is provided with a tension applying roller 25 and a belt tension adjusting means 26 which will be described later, and due to these operations, the length of the transport belt 23 caused by the expansion and contraction of the article transport surface F is excessive or insufficient. Absorbs.

(物品搬送面伸縮手段24)
物品搬送面伸縮手段24は、第一及び第二コンベアフレーム27,28を相対移動させる駆動機構であり、ボールネジ241、ボールナット242及びサーボモータ243を備えてなる。ボールネジ241は、物品搬送方向に延びるように設けられ、第一コンベアフレーム27に連結固定される軸受部材241a,241bで回転可能に軸受支持される。ボールナット242は、第二コンベアフレーム28に連結固定され、かつ、ボールネジ241に螺合されており、ボールネジ241の軸回転に応じて、第二コンベアフレーム28をスライド移動させる。サーボモータ243は、ボールネジ241を軸回転させる駆動源で、ボールネジ241に直接、又は伝導機構を介して連結される。サーボモータ243の作動により、第二搬送ローラ22を支持する第二コンベアフレーム28がモータ回転数に応じてスライド移動し、両搬送ローラ間の距離L、すなわち、物品搬送面Fの長さを無段階で伸縮させる。サーボモータ243は、オペレータによる不図示の操作部への物品長のデータ入力等に基づき制御部Cが生成する制御信号に応じて、物品搬送間隔を最適化できる物品搬送面Fを形成する。
(Article conveying surface expansion / contraction means 24)
The article transport surface expansion / contraction means 24 is a drive mechanism that relatively moves the first and second conveyor frames 27 and 28, and includes a ball screw 241, a ball nut 242, and a servo motor 243. The ball screw 241 is provided so as to extend in the article conveying direction, and is rotatably supported by bearing members 241a and 241b connected and fixed to the first conveyor frame 27. The ball nut 242 is connected and fixed to the second conveyor frame 28 and screwed to the ball screw 241, and slides the second conveyor frame 28 according to the shaft rotation of the ball screw 241. The servo motor 243 is a driving source for rotating the ball screw 241 and is connected to the ball screw 241 directly or via a conduction mechanism. By the operation of the servo motor 243, the second conveyor frame 28 that supports the second conveying roller 22 slides according to the number of rotations of the motor, and the distance L between the two conveying rollers, that is, the length of the article conveying surface F is reduced. Stretch in stages. The servo motor 243 forms an article conveyance surface F that can optimize the article conveyance interval in accordance with a control signal generated by the control unit C based on an article length data input to an operation unit (not shown) by an operator.

(張力付与ローラ25)
張力付与ローラ25は、図1(a)及び(b)に示されるように、第一及び第二搬送ローラ21,22とは別に設けられ、迂回経路R上で搬送ベルト23に押接されることにより、該ベルトに張力を付与するベルトローラ群で、第一コンベアフレーム27に対して位置固定されている固定ローラ251と、これらに対して物品搬送面伸縮手段24の作動に伴い変位する変位ローラ252と、からなる。固定ローラ251は、第二搬送ローラ22で折り返された搬送ベルト23の表側(物品搬送面側)に押接してベルトを迂回経路Rに導く方向転換ローラ251aと、迂回経路R上で所定間隔をおいて搬送ベルト23の裏側に押接し、第一搬送ローラ21へ戻すように導く走行ローラ251b〜251eからなり、すべて第一コンベアフレーム27、すなわち重量チェッカ本体11に対して軸受支持される。変位ローラ252は、迂回経路Rに沿って配置され、走行ローラ251b〜251eの各中間位置に臨むベルトローラ252a〜252cであって、迂回経路Rに対して交差する方向にスライド可能なローラ支持部材253に軸受支持されており、物品搬送面Fの伸縮に応じて変位することで搬送ベルト23に適正な張力を付与する。ローラ支持部材253はレール253aによってスライド可能に支持される。物品搬送面Fを長くする場合は、図1(a)に示されるように、それに応じて搬送ベルト23の張りを緩め、物品搬送面Fが短くする場合は、図1(b)に示されるように、搬送ベルト23を九十九折状に繰り寄せることにより、搬送コンベア2全体における搬送ベルト23の長さの過不足を吸収する。
(Tensioning roller 25)
As shown in FIGS. 1A and 1B, the tension applying roller 25 is provided separately from the first and second transport rollers 21 and 22, and is pressed against the transport belt 23 on the detour path R. Thus, a belt roller group for applying tension to the belt, a fixed roller 251 that is fixed with respect to the first conveyor frame 27, and a displacement that is displaced with the operation of the article conveying surface expansion / contraction means 24 with respect to these. A roller 252. The fixed roller 251 presses against the front side (article conveyance surface side) of the conveyance belt 23 that is folded back by the second conveyance roller 22, and a direction changing roller 251 a that guides the belt to the detour path R, and a predetermined interval on the detour path R. In this case, the driving rollers 251 b to 251 e are pressed against the back side of the conveying belt 23 and guided to return to the first conveying roller 21, and are all supported by the first conveyor frame 27, that is, the weight checker main body 11. The displacement roller 252 is a belt roller 252a to 252c that is disposed along the detour path R and faces each intermediate position of the travel rollers 251b to 251e, and is a roller support member that can slide in a direction intersecting the detour path R. The bearing 253 is supported by a bearing, and an appropriate tension is applied to the conveyor belt 23 by being displaced according to the expansion and contraction of the article conveyance surface F. The roller support member 253 is slidably supported by the rail 253a. When the article conveying surface F is lengthened, as shown in FIG. 1A, the tension of the conveying belt 23 is loosened accordingly, and when the article conveying surface F is shortened, the article conveying surface F is shown in FIG. In this way, by feeding the conveyor belt 23 into a ninety-nine fold shape, excess or deficiency of the length of the conveyor belt 23 in the entire conveyor 2 is absorbed.

(ベルト張力調整手段26)
ベルト張力調整手段26は、第一コンベアフレーム27、すなわち重量チェッカ本体11とローラ支持部材253の間に設けられて、ローラ支持部材253をスライド移動させる駆動機構であり、ボールネジ261、ボールナット262及びサーボモータ263を備える。ボールネジ261は、重量センサ3を介して重量チェッカ本体11に連結固定される軸受部材261a,261bで軸受支持され、ローラ支持部材253のスライド方向に延びるように設けられる。ボールナット262は、ローラ支持部材253に連結固定され、かつ、ボールネジ261に螺合され、その軸回転に応じてローラ支持部材253を移動させる。サーボモータ263は、ボールネジ261を軸回転させる駆動源で、ボールネジ261に直接又は伝導機構を介して連結される。サーボモータ263を作動させることにより、ローラ支持部材253がモータ回転数に応じて無段階にスライド移動し、上述したように搬送ベルト23の長さの過不足を吸収するとともに、ベルト張力を付与する。サーボモータ263の回転角は、サーボモータ243の回転角に応じて、ベルト長さの過不足が吸収できるように予め設定されている。
(Belt tension adjusting means 26)
The belt tension adjusting means 26 is a driving mechanism that is provided between the first conveyor frame 27, that is, the weight checker body 11 and the roller support member 253, and slides the roller support member 253, and includes a ball screw 261, a ball nut 262, and A servo motor 263 is provided. The ball screw 261 is supported by bearing members 261 a and 261 b that are connected and fixed to the weight checker body 11 via the weight sensor 3, and is provided so as to extend in the sliding direction of the roller support member 253. The ball nut 262 is connected and fixed to the roller support member 253 and is screwed to the ball screw 261 to move the roller support member 253 according to the rotation of the shaft. The servo motor 263 is a drive source for rotating the ball screw 261 and is coupled to the ball screw 261 directly or via a conduction mechanism. By operating the servo motor 263, the roller support member 253 slides in a stepless manner according to the number of rotations of the motor, absorbs the excess or deficiency of the length of the transport belt 23 as described above, and applies belt tension. . The rotation angle of the servo motor 263 is set in advance according to the rotation angle of the servo motor 243 so that excess or deficiency of the belt length can be absorbed.

(重量センサ3)
重量センサ3は、重量チェッカ本体11に支持される一方、搬送コンベア2の全体重量を支持するロードセルであって、搬送コンベア2の物品搬送面F上を搬送される物品の重量に応じた計量信号を出力する。当該計量信号は、不図示の制御部Cに入力され、制御部Cにおいて物品重量が求められる。すなわち、重量センサ3の検出結果に基づいて、搬送コンベア2で搬送中の物品を重量計量することができる。なお、重量センサ3は、物品搬送面Fの伸縮に伴う搬送コンベア2の重心移動によって受ける偏荷重の影響を緩和するため、第一コンベアフレーム27の後方寄りを支持している。
(Weight sensor 3)
The weight sensor 3 is a load cell that is supported by the weight checker main body 11 and supports the entire weight of the transport conveyor 2, and is a weighing signal corresponding to the weight of the article transported on the article transport surface F of the transport conveyor 2. Is output. The measurement signal is input to a control unit C (not shown), and the control unit C obtains the article weight. That is, based on the detection result of the weight sensor 3, it is possible to weigh an article being conveyed by the conveyor 2. Note that the weight sensor 3 supports the rear side of the first conveyor frame 27 in order to alleviate the influence of the unbalanced load caused by the movement of the center of gravity of the transport conveyor 2 accompanying the expansion and contraction of the article transport surface F.

(第一の実施形態に係る重量チェッカ1の特徴)
第一の実施形態に係る重量チェッカ1は、以下のような特徴を有している。第一に、単一の重量センサ3で支持される搬送コンベア2において、搬送ベルト23が巻き掛けられて物品搬送面Fを形成する第一及び第二搬送ローラ21,22を接近又は離間する方向に相対変位させることにより、物品搬送面Fを伸縮する物品搬送面伸縮手段24を備えるという特徴を有している。これにより、計量物品の搬送方向における物品長に応じて、物品搬送面Fの長さを変更することができる。その結果、物品搬送間隔を適正化して、計量能力の低下が防止される。また、単一の重量センサで異なる物品長に対応できるため、装置の製造コスト及び維持コストを抑えられ、また、複数の計量コンベアを組み合わせる場合に比べて重量計量信号を安定させ易く、計量精度を悪化させる心配がない。
(Characteristics of the weight checker 1 according to the first embodiment)
The weight checker 1 according to the first embodiment has the following characteristics. First, in the conveyor 2 supported by a single weight sensor 3, the direction in which the conveyor belt 23 is wound and the first and second conveyor rollers 21 and 22 forming the article conveyance surface F are approached or separated from each other. It has the characteristic that the article conveyance surface expansion-contraction means 24 which expands-contracts the article conveyance surface F is provided by making it relatively displace. Thereby, the length of the article conveyance surface F can be changed according to the article length in the conveyance direction of the weighing article. As a result, the article conveyance interval is optimized to prevent the weighing capacity from being lowered. In addition, since a single weight sensor can handle different article lengths, the manufacturing cost and maintenance cost of the device can be reduced, and the weighing signal can be stabilized more easily and weighing accuracy compared to the combination of multiple weighing conveyors. There is no worry to make it worse.

第二に、物品搬送面伸縮手段24は、サーボモータ243で回転駆動されるボールネジ241と、ボールナット242との組み合わせにより、物品搬送面Fの長さを無段階に伸縮できるという特徴を有している。これにより、物品長に応じて、必要最小限の搬送間隔とする物品搬送面長さを実現することができ、その結果、計量能力の低下を完全に解消することができる。また、サーボモータ243の使用により、モータ回転数の制御のみで物品搬送面Fを適当な長さとする調整を容易に行える。   Second, the article conveying surface expansion / contraction means 24 has a feature that the length of the article conveying surface F can be expanded and contracted steplessly by a combination of a ball screw 241 that is rotationally driven by a servo motor 243 and a ball nut 242. ing. Thereby, according to the article length, it is possible to realize the article conveyance surface length that is the minimum necessary conveyance interval, and as a result, it is possible to completely eliminate the decrease in the weighing capacity. Further, by using the servo motor 243, it is possible to easily adjust the article conveyance surface F to an appropriate length only by controlling the motor rotation speed.

第三に、物品搬送面伸縮手段24を作動させて物品搬送面Fを長くする場合は、搬送ベルト23を伸ばすように張りを緩め、物品搬送面Fを短くする場合は、搬送ベルト23を九十九折状に畳むように引き寄せて、ベルト長さの過不足を吸収するベルト張力調整手段26を備えるという特徴を有している。これにより、物品搬送面Fを伸縮させるために、長さの異なる搬送ベルトを準備する必要がなく、段取り替えの際に搬送ベルトに交換する手間も省ける。   Third, when the article conveying surface expansion / contraction means 24 is operated to lengthen the article conveying surface F, the tension is loosened so that the conveying belt 23 is extended, and when the article conveying surface F is shortened, the conveying belt 23 is The belt tension adjusting means 26 is provided that draws it into a nineteen-fold shape and absorbs the excess or deficiency of the belt length. Thereby, in order to expand and contract the article conveyance surface F, it is not necessary to prepare conveyance belts having different lengths, and it is possible to save the trouble of exchanging with the conveyance belt at the time of setup change.

(本発明の第二の実施形態)
次に、本発明の第二の実施形態を、添付図面を参照しながら説明する。図2は、本実施形態に係る重量チェッカ4を示す図であって、(a)は物品搬送面Fを最も長く伸ばした状態、(b)は物品搬送面Fを最も短く縮めた状態を表す。
(Second embodiment of the present invention)
Next, a second embodiment of the present invention will be described with reference to the accompanying drawings. 2A and 2B are diagrams showing the weight checker 4 according to the present embodiment, in which FIG. 2A shows a state in which the article conveying surface F is extended the longest, and FIG. 2B shows a state in which the article conveying surface F is shortened the shortest. .

(重量チェッカ4)
重量チェッカ4は、図2(a)及び(b)中の左側に設けられる物品搬入口INから物品を受け入れ、同図中の右側に設けられる物品搬出口EXへ向けて物品を搬送する搬送コンベア5と、搬送コンベア5を支持する重量センサ6と、を備えてなり、重量センサ6の検出結果に基づき、搬送コンベア5で搬送中の物品を重量計量する。
(Weight Checker 4)
The weight checker 4 receives the article from the article carry-in port IN provided on the left side in FIGS. 2A and 2B, and conveys the article toward the article carry-out port EX provided on the right side in FIG. 5 and a weight sensor 6 that supports the conveyor 5, and weighs articles being conveyed by the conveyor 5 based on the detection result of the weight sensor 6.

(搬送コンベア5)
搬送コンベア5は、コンベア後端の物品搬入口INに設けられる第一搬送ローラ51と、コンベア前端の物品搬出口EXに設けられる第二搬送ローラ52と、両搬送ローラ51,52に巻き掛けられて、それらの間に物品を搬送する物品搬送面Fを形成する搬送ベルト53と、を備えるベルトコンベアである。また、搬送コンベア5は、両搬送ローラ51,52を相互に接近又は離間する方向に相対変位させて、両搬送ローラ間の距離Lを、図2(a)に示す最長状態から、同図(b)に示す最短状態までの範囲内で変化させて、物品搬送面Fを伸縮する物品搬送面伸縮手段54を備える。さらに、両搬送ローラ51,52とは別に設けられ、搬送ベルト53に押接されることで張力を付与する張力付与ローラ55と、これを変位させて物品搬送面Fの伸縮に伴うベルト長さの過不足を吸収しつつベルト張力を調整するベルト張力調整手段56と、を備える。
(Conveyor 5)
The transport conveyor 5 is wound around a first transport roller 51 provided at an article carry-in port IN at the rear end of the conveyor, a second transport roller 52 provided at an article carry-out port EX at the front end of the conveyor, and both the transport rollers 51 and 52. And a conveyor belt 53 that forms an article conveying surface F for conveying articles between them. Further, the transport conveyor 5 relatively displaces both the transport rollers 51 and 52 in the direction approaching or separating from each other, so that the distance L between the both transport rollers is changed from the longest state shown in FIG. An article conveying surface extending / contracting means 54 is provided to expand and contract the article conveying surface F by changing within the range up to the shortest state shown in b). Further, a tension applying roller 55 that is provided separately from both the conveying rollers 51 and 52 and applies a tension by being pressed against the conveying belt 53, and a belt length that is displaced to extend and contract the article conveying surface F. Belt tension adjusting means 56 for adjusting the belt tension while absorbing the excess or deficiency of the belt.

(第一搬送ローラ51及び第二搬送ローラ52)
第一搬送ローラ51は、物品搬送方向に延びる第一コンベアフレーム57の後端に、回転可能に軸受支持される従動ローラであり、第二搬送ローラ52は、同じく物品搬送方向に延びる第二コンベアフレーム28の前端に、回転可能に軸受支持され、不図示のコンベア駆動モータによって回転駆動される駆動ローラである。これらのコンベアフレーム57,58は、図2に示されるように、両者がメインフレーム59に対して前後対称となるように設けられ、不図示のスライド機構により、メインフレーム59に対して物品搬送方向にスライド可能に支持されており、これによって、両搬送ローラ51,52は、相互に接近又は離間する方向に相対変位可能とされる。なお、スライド機構は、メインフレーム59に連結固定されるレールと、各コンベアフレームに連結固定されて、前記レールに対してスライド可能なスライダーと、を備えてなり、メインフレーム59は、重量センサ6を介して重量チェッカ本体41に支持される。
(First transport roller 51 and second transport roller 52)
The first transport roller 51 is a driven roller rotatably supported by the rear end of the first conveyor frame 57 extending in the article transport direction, and the second transport roller 52 is a second conveyor that also extends in the article transport direction. A driving roller is rotatably supported by a bearing at the front end of the frame 28 and is driven to rotate by a conveyor drive motor (not shown). As shown in FIG. 2, these conveyor frames 57 and 58 are provided so that both are symmetrical with respect to the main frame 59, and an article conveyance direction with respect to the main frame 59 by a slide mechanism (not shown). Thus, the conveying rollers 51 and 52 can be relatively displaced in a direction approaching or separating from each other. The slide mechanism includes a rail that is connected and fixed to the main frame 59, and a slider that is connected and fixed to each conveyor frame and is slidable with respect to the rail. The main frame 59 includes the weight sensor 6. It is supported by the weight checker body 41 via

(搬送ベルト53)
搬送ベルト53は、第一搬送ローラ51及び第二搬送ローラ52に巻き掛けられ、両搬送ローラ間の上面側に物品搬送面Fを形成し、第二搬送ローラ52の回転駆動に伴って物品搬送方向に走行する。搬送ベルト53は、図2(a)及び(b)に示されるように、物品搬送面Fを形成した後、物品搬出口EXに設けられる第二搬送ローラ52でその下方側に回り込むように方向転換し、重量センサ6を避けるように下方へ張り出した概ねコ字形状の迂回経路Rを走行して、さらに物品搬入口INに設けられる第一搬送ローラ51まで戻り、再び物品搬送面Fを形成するように、循環走行する。なお、迂回経路Rには、後述する張力付与ローラ55やベルト張力調整手段56が設けられており、これらの作動によって、物品搬送面Fの伸縮に伴って生じる搬送ベルト53の長さの過不足を吸収する。
(Conveyor belt 53)
The conveyance belt 53 is wound around the first conveyance roller 51 and the second conveyance roller 52, forms an article conveyance surface F on the upper surface side between the both conveyance rollers, and conveys the article as the second conveyance roller 52 rotates. Travel in the direction. As shown in FIGS. 2A and 2B, the conveyance belt 53 is formed so as to wrap around the lower side thereof by the second conveyance roller 52 provided at the article carry-out port EX after the article conveyance surface F is formed. In order to avoid the weight sensor 6, the vehicle travels on a substantially U-shaped detour route R protruding downward, and returns to the first transport roller 51 provided at the article carry-in port IN to form the article transport surface F again. Cycle as you do. The detour path R is provided with a tension applying roller 55 and a belt tension adjusting means 56 which will be described later, and due to these operations, the length of the conveying belt 53 caused by the expansion and contraction of the article conveying surface F is excessive or insufficient. Absorbs.

(物品搬送面伸縮手段54)
物品搬送面伸縮手段54は、第一及び第二コンベアフレーム57,58をスライド移動させる駆動機構であり、ボールネジ541,542、ボールナット543,544及びサーボモータ545を備えてなる。ボールネジ541,542は、同ピッチのネジ山が逆方向(右ネジと左ネジ)に切られて同軸で一体形成されるとともに、物品搬送方向に延びるように配設され、重量チェッカ本体41に対して軸受部材で軸受支持される。ボールナット543,544は、それぞれ第一及び第二コンベアフレーム57,58に連結固定され、かつ、ボールネジ541,542に螺合されており、それらの軸回転に応じて、逆方向に同じ距離だけ移動する。サーボモータ545は、ボールネジ541,542を軸回転させる駆動源であって、ボールネジ541,542に伝導機構546を介して連結される。したがって、サーボモータ545の作動により、第一及び第二コンベアフレーム57,58がモータ回転数に応じて、前後逆方向に同じ距離だけスライド移動し、両搬送ローラ51,52間の距離L、すなわち、物品搬送面Fの長さを無段階で伸縮させる。サーボモータ545は、オペレータによる不図示の操作部への入力データに基づき、重量計量する物品の搬送方向の長さに応じて、物品搬送間隔を最適化できる物品搬送面Fを形成する。
(Article conveying surface expansion / contraction means 54)
The article transport surface expansion / contraction means 54 is a drive mechanism that slides the first and second conveyor frames 57 and 58, and includes ball screws 541 and 542, ball nuts 543 and 544, and a servo motor 545. The ball screws 541 and 542 are threaded in the opposite direction (right screw and left screw) and are integrally formed coaxially, and are disposed so as to extend in the article conveying direction. The bearing is supported by the bearing member. The ball nuts 543 and 544 are connected and fixed to the first and second conveyor frames 57 and 58, respectively, and screwed into the ball screws 541 and 542, and according to their axial rotation, the same distance in the opposite direction. Moving. The servo motor 545 is a drive source for rotating the ball screws 541 and 542, and is connected to the ball screws 541 and 542 via a conduction mechanism 546. Therefore, by the operation of the servo motor 545, the first and second conveyor frames 57 and 58 are slid by the same distance in the backward and forward directions according to the motor rotation speed, and the distance L between the transport rollers 51 and 52, that is, The length of the article conveying surface F is expanded and contracted steplessly. The servo motor 545 forms an article conveyance surface F that can optimize the article conveyance interval according to the length of the article to be weighed in the conveyance direction based on data input to an operation unit (not shown) by the operator.

(張力付与ローラ55)
張力付与ローラ55は、図1(a)及び(b)に示されるように、第一及び第二搬送ローラ51,52とは別に設けられ、迂回経路R上で搬送ベルト53に押接されることにより、該ベルトに張力を付与するベルトローラ群で、メインフレーム59に対して位置が固定されている固定ローラ551と、物品搬送面伸縮手段54の作動に伴って変位する変位ローラ552と、からなる。固定ローラ551は、第一及び第二搬送ローラ52で折り返される搬送ベルト53の表側(物品搬送面側)に押接する方向転換ローラ551a,551fと、迂回経路R上で所定間隔をおいて配置され、搬送ベルト53の裏側に押接する走行ローラ551b〜551eとからなり、すべてメインフレーム59に対して軸受支持される。変位ローラ552は、迂回経路Rに沿って配置され、走行ローラ551b〜551eの各中間位置に臨むベルトローラ552a〜552cであって、迂回経路Rに対して交差する方向にスライド可能なローラ支持部材553に軸受支持されており、物品搬送面Fの伸縮に応じて変位することで搬送ベルト53に適正な張力を付与する。ローラ支持部材553は、レール553aによってメインフレーム59に対してスライド可能に支持される。物品搬送面Fを長くする場合は、図2(a)に示されるように、それに応じて搬送ベルト53の張りを緩め、物品搬送面Fが短くする場合は、図2(b)に示されるように、搬送ベルト53を九十九折状に繰り寄せることにより、搬送コンベア5全体におけるベルト長さの過不足を吸収する。
(Tensioning roller 55)
As shown in FIGS. 1A and 1B, the tension applying roller 55 is provided separately from the first and second transport rollers 51 and 52, and is pressed against the transport belt 53 on the detour path R. Thus, a belt roller group that applies tension to the belt, a fixed roller 551 whose position is fixed with respect to the main frame 59, a displacement roller 552 that is displaced in accordance with the operation of the article conveying surface expansion / contraction means 54, Consists of. The fixed roller 551 is disposed on the detour route R at a predetermined interval from the direction changing rollers 551a and 551f that press against the front side (the article conveying surface side) of the conveying belt 53 that is folded back by the first and second conveying rollers 52. The running rollers 551b to 551e are in pressure contact with the back side of the conveyor belt 53, and are all supported by the main frame 59 with bearings. The displacement rollers 552 are belt rollers 552a to 552c that are arranged along the detour path R and face intermediate positions of the travel rollers 551b to 551e, and are slidable in a direction that intersects the detour path R. The bearing 553 is supported by a bearing, and an appropriate tension is applied to the conveying belt 53 by being displaced according to the expansion and contraction of the article conveying surface F. The roller support member 553 is slidably supported with respect to the main frame 59 by the rail 553a. When the article conveyance surface F is lengthened, as shown in FIG. 2A, the tension of the conveyor belt 53 is loosened accordingly, and when the article conveyance surface F is shortened, the article conveyance surface F is shown in FIG. In this way, the belt length in the entire conveyor 5 is absorbed by feeding the conveyor belt 53 into a ninety-fold shape.

(ベルト張力調整手段56)
ベルト張力調整手段56は、メインフレーム59とローラ支持部材553の間に設けられて、ローラ支持部材553をスライド移動させる駆動機構であり、ボールネジ561、ボールナット562及びサーボモータ563を備えてなる。ボールネジ561は、重量チェッカ本体41に重量センサ6を介して連結固定される軸受部材561a,561bで回転可能に軸受支持され、ローラ支持部材553のスライド方向に延びるように設けられる。ボールナット562は、ローラ支持部材553に連結固定され、かつ、ボールネジ561に螺合されて、ボールネジ561の軸回転に応じてローラ支持部材553を移動させる。サーボモータ545は、ボールネジ561を軸回転させる駆動源で、ボールネジ561に直接又は伝導機構を介して連結される。サーボモータ563を作動させることにより、変位ローラ552を支持するローラ支持部材553がモータ回転数に応じて無段階にスライド移動し、上述したように搬送ベルト53の長さの過不足を吸収する。サーボモータ563は、サーボモータ545の回転角に応じて、ベルト長さの過不足が吸収されるように作動するように予め設定されている。
(Belt tension adjusting means 56)
The belt tension adjusting unit 56 is a drive mechanism that is provided between the main frame 59 and the roller support member 553 and slides the roller support member 553, and includes a ball screw 561, a ball nut 562, and a servo motor 563. The ball screw 561 is rotatably supported by bearing members 561a and 561b connected and fixed to the weight checker body 41 via the weight sensor 6, and is provided so as to extend in the sliding direction of the roller support member 553. The ball nut 562 is connected and fixed to the roller support member 553 and is screwed to the ball screw 561 to move the roller support member 553 according to the shaft rotation of the ball screw 561. The servo motor 545 is a drive source for rotating the ball screw 561 and is coupled to the ball screw 561 directly or via a conduction mechanism. By operating the servo motor 563, the roller support member 553 that supports the displacement roller 552 slides steplessly in accordance with the motor rotation speed, and absorbs the excess or deficiency of the length of the conveyor belt 53 as described above. The servo motor 563 is set in advance to operate so as to absorb the excess or deficiency of the belt length according to the rotation angle of the servo motor 545.

(重量センサ6)
重量センサ6は、重量チェッカ本体41に支持される一方、搬送コンベア5の全体重量を支持するロードセルであって、搬送コンベア5の物品搬送面F上を搬送される物品の重量に応じた計量信号を出力する。当該計量信号は、不図示の制御部Cに入力され、制御部Cにおいて物品重量が求められる。すなわち、重量センサ6の検出結果に基づいて、搬送コンベア5で搬送中の物品を重量計量することができる。
(Weight sensor 6)
The weight sensor 6 is a load cell that is supported by the weight checker main body 41 and supports the entire weight of the transport conveyor 5, and is a measurement signal corresponding to the weight of the article transported on the article transport surface F of the transport conveyor 5. Is output. The measurement signal is input to a control unit C (not shown), and the control unit C obtains the article weight. That is, based on the detection result of the weight sensor 6, it is possible to weigh an article being conveyed by the conveyor 5.

(第二の実施形態に係る重量チェッカ4の特徴)
第二の実施形態に係る重量チェッカ4は、第一の実施形態に係る重量チェッカ1と同様に、(1)搬送ローラ51,52を接近又は離間する方向に相対変位させて物品搬送面Fを伸縮する、(2)サーボモータ545で回転駆動されるボールナット541とボールネジ542の組み合わせで物品搬送面Fを無段階に伸縮する、(3)物品搬送面伸縮手段54の作動に応じてベルト長さの過不足を吸収するベルト張力調整手段56を備える、等の特徴を有するほか、以下の特徴を有している。
(Characteristics of the weight checker 4 according to the second embodiment)
Similar to the weight checker 1 according to the first embodiment, the weight checker 4 according to the second embodiment (1) relatively displaces the conveyance rollers 51 and 52 in the direction in which the conveyance rollers 51 and 52 approach or separate from each other so that the article conveyance surface F (2) The article conveyance surface F is expanded and contracted steplessly by the combination of the ball nut 541 and the ball screw 542 that are rotationally driven by the servo motor 545. (3) The belt length according to the operation of the article conveyance surface expansion / contraction means 54 In addition to the features such as the belt tension adjusting means 56 that absorbs excess and deficiency, the following features are provided.

重量チェッカ4では、物品搬送面伸縮手段54が、第一及び第二コンベアフレーム57,58(第一及び第二搬送ローラ51,52)をメインフレーム59に対して、前後逆方向に同じ距離だけスライド変位するという特徴を有している。したがって、重量センサ6で搬送コンベア2(メインフレーム59)の物品搬送方向の中央位置(重心位置)を支持することにより、搬送コンベア5から重量センサ6に負荷される偏荷重を抑えることができ、その結果として、高い計量精度を確保することができる。   In the weight checker 4, the article conveying surface expansion / contraction means 54 moves the first and second conveyor frames 57 and 58 (first and second conveying rollers 51 and 52) from the main frame 59 by the same distance in the front-rear reverse direction. It has the feature of sliding displacement. Therefore, by supporting the center position (center of gravity position) of the conveyance conveyor 2 (main frame 59) in the article conveyance direction by the weight sensor 6, it is possible to suppress the uneven load applied to the weight sensor 6 from the conveyance conveyor 5. As a result, high weighing accuracy can be ensured.

物品搬送面伸縮手段54は、同ピッチのネジ山を逆方向に切った一体形成のボールネジ541,542を回転させて、第一及び第二コンベアフレーム57,58を変位させるという特徴を有している。したがって、第一及び第二搬送ローラ51,52を逆方向に移動させるサーボモータは一個で済み、二個のサーボモータを同期させて使用する場合よりも低コストで容易に対応することが可能となる。   The article conveying surface expansion / contraction means 54 has a feature that the first and second conveyor frames 57 and 58 are displaced by rotating integrally formed ball screws 541 and 542 in which the same pitch thread is cut in the opposite direction. Yes. Therefore, only one servo motor is required to move the first and second transport rollers 51 and 52 in the reverse direction, and it is possible to easily cope with lower costs than when two servo motors are used in synchronization. Become.

(上記実施形態の変形例)
上記第一及び第二の実施形態では、重量チェッカ1,4のみについて説明したが、例えば、図3に示されるように、重量チェッカ4へ物品を搬入する搬入コンベア7及び重量チェッカ4から物品を搬出する搬出コンベア8を、搬送コンベア2の物品搬送方向の手前側及び向う側に隣接配置するとともに、物品搬送面Fの伸縮動作に同期して、搬送コンベア2に接近又は離間させる方向に自動的に移動させることにより、搬送コンベア2との間隔を一定に保つ搬送装置としても良い。これにより、作業者が物品長の変更を伴う段取り替えの都度、前後の搬入・搬出コンベアを動かしたり、間隔寸法を調整したりする手間が省くことができる。搬送コンベア2の前後に配置される搬入・搬出コンベアを、物品搬送面Fの伸縮と同期的に移動させる移動手段としては、図3に示される搬入コンベア7のように、物品搬送面Fのみを伸縮移動させる物品搬送面伸縮手段74や、あるいは、同図に示される搬出コンベア8のように、コンベアを支持するコンベア支持台85を移動させる機構が採用される。
(Modification of the above embodiment)
In the first and second embodiments, only the weight checkers 1 and 4 have been described. For example, as shown in FIG. 3, the articles are loaded from the carry-in conveyor 7 and the weight checker 4 that carry the articles into the weight checker 4. The carry-out conveyor 8 to be carried out is arranged adjacent to the front side and the opposite side in the article conveyance direction of the conveyance conveyor 2 and automatically in a direction to approach or separate from the conveyance conveyor 2 in synchronization with the expansion and contraction operation of the article conveyance surface F. It is good also as a conveying apparatus which maintains the space | interval with the conveyance conveyor 2 by making it move. Thereby, it is possible to save time and labor for the operator to move the front and rear loading / unloading conveyors and adjust the interval dimension each time the setup is changed with the change of the article length. As the moving means for moving the loading / unloading conveyors arranged before and after the conveyor 2 in synchronization with the expansion and contraction of the article conveying surface F, only the article conveying surface F 7 as shown in the loading conveyor 7 shown in FIG. A mechanism for moving a conveyor support base 85 that supports the conveyor is employed, such as an article conveying surface expansion / contraction means 74 that extends and contracts or a carry-out conveyor 8 shown in FIG.

搬入コンベア7は、重量チェッカ1から重量センサ3を取り除いたものと略同様の構造で、コンベア本体7aに連結固定される上流側の第一コンベアフレーム77と、これにスライド機構でスライド支持される下流側(搬送コンベア5側)の第二コンベアフレーム78に、第一搬送ローラ71と第二搬送ローラ72をそれぞれ軸受支持させ、第二コンベアフレーム78を物品搬送面伸縮手段74で移動させる。これにより、物品搬送面Fが搬送コンベア2に接近又は離間させる方向に伸縮移動する。両搬送ローラ71,72に巻き掛けられて物品搬送面Fを形成する搬送ベルト73は、張力付与ローラ75,ベルト張力調整手段76によって、物品搬送面Fの伸縮に伴う過不足が吸収される。物品搬送面Fを下流側にのみ伸縮移動させる構造を採用することで、さらに上流に設けられる別の装置と搬入コンベア7の隙間を一定に保つことができる。 The carry-in conveyor 7 has substantially the same structure as that obtained by removing the weight sensor 3 from the weight checker 1 and is supported by a slide mechanism on the upstream-side first conveyor frame 77 connected and fixed to the conveyor body 7a. The first conveyor roller 71 and the second conveyor roller 72 are supported by bearings on the second conveyor frame 78 on the downstream side (conveyor 5 side), and the second conveyor frame 78 is moved by the article conveying surface expansion / contraction means 74. Thus, the article transport surface F 7 expands and contracts moved in a direction of approaching or away from the conveyor 2. Conveyor belt 73 wound around the two conveyor rollers 71 and 72 to form an article transport surface F 7 are tensioning roller 75, the belt tension adjusting means 76 is absorbed excess and deficiency due to expansion and contraction of the article transport surface F 7 The An article transport surface F 7 By employing the structure to stretch only move to the downstream side, can be kept still another device provided upstream the gap of the carry conveyor 7 constant.

搬出コンベア8は、第一及び第二搬送ローラ81,82に搬送ベルト83を巻き掛けてなるベルトコンベアを、基台84に対して物品搬送方向にレールでスライド支持されるコンベア支持台85に設けてなる。基台84には、モータ841で回転駆動されるボールネジ842が軸受支持される一方、コンベア支持台85には、ボールネジ842と螺合されるボールナット851が固定されている。モータ841の作動によって、ベルトコンベア全体が搬送コンベア5に接近又は離間する方向に移動し、その物品搬送面Fが、搬送コンベア2の物品搬送面Fとの間隔を一定に保つことができる。搬入コンベア7及び搬出コンベア8は、重量チェッカ4に備えられる制御部Cによって、搬送コンベア5の物品搬送面Fの伸縮動作と連係して、その端部の移動距離と同じ距離を移動するように制御される。 The carry-out conveyor 8 is provided with a belt conveyor formed by winding a conveyance belt 83 around first and second conveyance rollers 81 and 82 on a conveyor support base 85 that is slidably supported by rails in the article conveyance direction with respect to the base 84. It becomes. A ball screw 842 that is rotationally driven by a motor 841 is supported by a bearing on the base 84, and a ball nut 851 that is screwed with the ball screw 842 is fixed to the conveyor support base 85. By the operation of the motor 841, the entire belt conveyor moves in a direction approaching or separating from the conveyance conveyor 5, and the article conveyance surface F 8 can keep a constant distance from the article conveyance surface F of the conveyance conveyor 2. The carry-in conveyor 7 and the carry-out conveyor 8 are moved by the control unit C provided in the weight checker 4 so as to move the same distance as the movement distance of the end portion in conjunction with the expansion and contraction operation of the article conveyance surface F of the conveyance conveyor 5. Be controlled.

搬入コンベア7と同様に、物品搬送面が伸縮移動して搬送コンベア2に接近又は離間するコンベアを、搬出コンベア8として採用しても良いし、搬出コンベア8と同様に、ベルトコンベア全体が搬送コンベア5に接近又は離間するコンベアを、搬入コンベア7として採用しても良く、搬送コンベア5の上下流に同タイプのコンベアを配設しても良い。なお、これらのコンベアは、搬送コンベア(重量チェッカ)の物品搬送面の伸縮のために移動する搬送ローラに近接して配設される。したがって、重量チェッカ1については、その下流側にのみ配設される。   Similarly to the carry-in conveyor 7, a conveyer in which the article carrying surface expands and contracts and approaches or separates from the carry conveyor 2 may be adopted as the carry-out conveyor 8. As with the carry-out conveyor 8, the entire belt conveyor is the carry conveyor. 5 may be adopted as the carry-in conveyor 7, and the same type of conveyor may be disposed on the upstream and downstream of the transfer conveyor 5. In addition, these conveyors are arrange | positioned adjacent to the conveyance roller which moves for the expansion-contraction of the article conveyance surface of a conveyance conveyor (weight checker). Therefore, the weight checker 1 is disposed only on the downstream side thereof.

上記第一及び第二の実施形態では、複数個設けた張力付与ローラ25,55の一部(変位ローラ252,552)を変位させることにより、物品搬送面Fの伸縮に伴う搬送ベルト23,53の長さの過不足を吸収させることとしたが、図4(a)に示されるように、張力付与ローラの全部を変位させる構造を採用しても良い。張力付与ローラは、複数個に限らず一個でも良い。また、張力付与ローラのすべてが、常時、搬送ベルトに押接される必要は無く、図4(b)に示されるように、搬送ベルトに張力を与える役割を担わせなくても良いローラについては、押接させないこととしても良い。その他、張力付与ローラの変位は、直線的にスライドさせるだけに限らず、例えばローラ支持部材を回転させて、張力付与ローラを変位させるようにしても良い。   In the first and second embodiments, a part of the plurality of tension applying rollers 25 and 55 (displacement rollers 252 and 552) is displaced, so that the transport belts 23 and 53 accompanying the expansion and contraction of the article transport surface F are achieved. However, as shown in FIG. 4A, a structure in which the entire tension applying roller is displaced may be employed. The number of tension applying rollers is not limited to a plurality and may be one. Further, it is not necessary for all of the tension applying rollers to be always pressed against the conveyance belt, and as shown in FIG. 4B, for a roller that does not need to play a role of applying tension to the conveyance belt. It is good also as not making it press-contact. In addition, the displacement of the tension applying roller is not limited to sliding linearly. For example, the tension applying roller may be displaced by rotating the roller support member.

上記第一及び第二の実施形態では、重量チェッカ2,5は、それぞれ単独で使用するものとして説明したが、複数台を連続配置して使用することを否定するものではない。その他、本発明は、上記した実施の形態に限定されるものではなく、発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。   In the first and second embodiments, the weight checkers 2 and 5 have been described as being used independently. However, it is not denied that a plurality of weight checkers 2 and 5 are used continuously. In addition, the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the scope of the invention.

本発明の第一の実施形態に係る重量チェッカ。The weight checker which concerns on 1st embodiment of this invention. 本発明の第二の実施形態に係る重量チェッカ。The weight checker which concerns on 2nd embodiment of this invention. 本発明の変形例。The modification of this invention. 本発明の別の変形例。Another modification of the present invention.

符号の説明Explanation of symbols

1 重量チェッカ
2 搬送コンベア
3 重量センサ
4 重量チェッカ
5 搬送コンベア
6 重量センサ
7 搬入コンベア
8 搬出コンベア
DESCRIPTION OF SYMBOLS 1 Weight checker 2 Conveyor 3 Weight sensor 4 Weight checker 5 Conveyor 6 Weight sensor 7 Loading conveyor 8 Unloading conveyor

Claims (3)

物品を搬送する搬送コンベアと、該搬送コンベアを支持する重量センサと、を備え、前記重量センサの検出結果に基づき前記搬送コンベアで搬送中の物品を重量計量する重量チェッカにおいて、
前記搬送コンベアは、
第一搬送ローラと、
第二搬送ローラと、
これらの両搬送ローラに巻き掛けられて、前記両搬送ローラ間に物品搬送面を形成する搬送ベルトと、
前記両搬送ローラを接近又は離間する方向に相対変位させることにより、前記両搬送ローラ間の距離を変化させて、前記物品搬送面を伸縮する物品搬送面伸縮手段と、
前記両搬送ローラとは別に設けられて、前記搬送ベルトに押接されることにより、前記搬送ベルトに張力を付与する張力付与ローラと、
前記張力付与ローラを変位させることにより、前記物品搬送面の伸縮に伴う搬送ベルト長さの過不足を吸収するベルト張力調整手段と、を備え、
重量計量する物品の長さに応じて、前記物品搬送面を伸縮可能にしたことを特徴とする重量チェッカ。
In a weight checker comprising a transport conveyor for transporting articles and a weight sensor for supporting the transport conveyor, and weighing the articles being transported by the transport conveyor based on the detection result of the weight sensor,
The conveyor is
A first conveying roller;
A second transport roller;
A conveyor belt wound around both of these conveyor rollers to form an article conveyor surface between the two conveyor rollers;
An article conveying surface expansion / contraction means for changing the distance between the two conveying rollers by relatively displacing the both conveying rollers in the approaching or separating direction;
A tension applying roller that is provided separately from both the transport rollers and applies tension to the transport belt by being pressed against the transport belt;
Belt tension adjusting means for absorbing excess or deficiency of the conveyor belt length accompanying expansion and contraction of the article conveying surface by displacing the tension applying roller;
A weight checker characterized in that the article conveying surface can be expanded and contracted according to the length of an article to be weighed.
請求項1記載の重量チェッカであって、
前記物品搬送面伸縮手段は、前記両搬送ローラを反対方向に同じ距離を変位させることを特徴とする重量チェッカ。
The weight checker according to claim 1,
The weight checker characterized in that the article conveying surface expansion / contraction means displaces both conveying rollers by the same distance in opposite directions.
請求項1又は2記載の重量チェッカを備える搬送装置であって、
前記重量チェッカへ物品を搬入する搬入コンベア及び/又は前記重量チェッカから物品を搬出する搬出コンベアを、前記搬送コンベアの物品搬送方向の手前側及び/又は向う側に配置されてなり、
前記搬入コンベア及び/又は前記搬出コンベアを、前記物品搬送面の伸縮動作に同期して、前記搬送コンベアに接近又は離間させる方向に移動させることにより、前記搬送コンベアとの間隔を一定に保つ移動手段を備えることを特徴とする搬送装置。
A transport device comprising the weight checker according to claim 1 or 2,
A carry-in conveyor for carrying articles into the weight checker and / or a carry-out conveyor for carrying out articles from the weight checker are arranged on the front side and / or the opposite side of the carry conveyor in the article conveyance direction,
Moving means for keeping the distance from the transfer conveyor constant by moving the carry-in conveyor and / or the carry-out conveyor in a direction to approach or move away from the transfer conveyor in synchronization with the expansion and contraction operation of the article transfer surface A conveying device comprising:
JP2008191401A 2008-07-24 2008-07-24 Weight checker and carrying apparatus with the same Pending JP2010032217A (en)

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FR3024717A1 (en) * 2014-06-19 2016-02-12 Somefi TELESCOPIC CONVEYOR.
CN109809118A (en) * 2017-11-22 2019-05-28 江苏中天华宇智能科技有限公司 Transmission device
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3024717A1 (en) * 2014-06-19 2016-02-12 Somefi TELESCOPIC CONVEYOR.
CN109809118A (en) * 2017-11-22 2019-05-28 江苏中天华宇智能科技有限公司 Transmission device
CN113167633A (en) * 2018-11-09 2021-07-23 株式会社大福 Article carrying apparatus
JP2020098117A (en) * 2018-12-17 2020-06-25 アンリツインフィビス株式会社 Weight measurement device
JP7139235B2 (en) 2018-12-17 2022-09-20 アンリツ株式会社 Weight measuring device
CN110921216A (en) * 2019-12-04 2020-03-27 湖南沃峰智能科技有限公司 Conveying device for material handling
CN110921216B (en) * 2019-12-04 2022-04-29 南京奇云智能科技有限公司 Conveying device for material handling
CN111674842A (en) * 2020-06-19 2020-09-18 蚌埠联玺自动化设备有限公司 Adjustable belt conveying device
CN113680712A (en) * 2021-07-01 2021-11-23 肖杰 Metal detector
CN114311604A (en) * 2022-02-11 2022-04-12 贺瑞峰 Damping type traction mechanism for drip irrigation tape production

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