JPH0413593Y2

JPH0413593Y2 -

Info

Publication number: JPH0413593Y2
Application number: JP20080886U
Authority: JP
Priority date: 1986-12-29
Filing date: 1986-12-29
Publication date: 1992-03-30
Also published as: JPS63108078U

Description

【考案の詳細な説明】〔考案の目的〕（産業上の利用分野）本考案は冷凍装置等に用いられる除霜または除
氷のための制御装置に関する。[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a control device for defrosting or deicing used in a refrigeration system or the like.

（従来の技術）この種の除霜制御装置としてはタイマーとサー
モスタツトとをシリーズに組合せたものが知られ
ている。この構造の場合、タイムセーフ中に、感
温部が設定範囲以上に大きく温度変化すると、除
霜用スイツチを何回もオン・オフ動作させてしま
うことになる。このようにスイツチを頻繁に開閉
すると機器の寿命を短かくし、エネルギーの無駄
使いであると共に、使用者に不快感を与える。(Prior Art) As this type of defrosting control device, one in which a timer and a thermostat are combined in series is known. In the case of this structure, if the temperature of the temperature sensing section changes significantly beyond the set range during time safe, the defrosting switch will be turned on and off many times. Frequently opening and closing the switch shortens the life of the device, wastes energy, and causes discomfort to the user.

（考案が解決しようとする問題点）このような不要な除霜動作を電気的に禁止する
制御回路は従来から知られているが、より安定か
な動作を行う機械的制御装置が望まれている。(Problem that the invention aims to solve) Control circuits that electrically prohibit such unnecessary defrosting operations have been known for a long time, but a mechanical control device that operates more stably is desired. .

前述した問題点を解決する機械的制御装置とし
ては、実公昭58−9754号公報で示された構造が知
られている。この装置は前述した問題点を解決で
きるが、カムのほかに別体のストツパ機構を必要
とし、構造が複雑化、大形化する。さらに、カム
やレバーとの間の調整も必要になる等、解決すべ
き点があつた。 As a mechanical control device that solves the above-mentioned problems, the structure shown in Japanese Utility Model Publication No. 58-9754 is known. Although this device can solve the above-mentioned problems, it requires a separate stopper mechanism in addition to the cam, making the structure complicated and large. Furthermore, there were other issues that needed to be resolved, such as the need for adjustment between the cam and the lever.

したがつて本考案の目的は、タイムセーフ中に
おける不要な除霜動作の繰返しを、安定した動作
の機械的な構造により確実に防止でき、しかも小
形に構成でき、面倒な調整作業も不要となる除霜
制御装置を提供することにある。 Therefore, the purpose of the present invention is to reliably prevent unnecessary repetition of defrosting operations during time-safe mode with a mechanical structure that operates stably, and which can be constructed in a compact size and eliminates the need for troublesome adjustment work. An object of the present invention is to provide a defrosting control device.

[Structure of the idea]

（問題点を解決するための手段）本考案による除霜制御装置は、感温部の温度低
下により一定方向に回動力を受けかつ感温部の温
度上昇により上記と反対方向に回動力を受ける応
動レバーを持つ。この応動レバーは上述した回動
ににより除霜用のスイツチをオン・オフ制御す
る。また、応動レバーの先端部には第１の係合
部、第２の係合部および調整ねじが設けられてい
る。この応動レバーに対しては、その第１の係合
部に対応する第１のカム面、第２の係合部に対す
る第２のカム面、調整ねじに対応する第３のカム
面を共通のカム軸に並設したカムを設ける。上記
カム軸は駆動機構により一定の低速度で回転駆動
される。 (Means for Solving the Problems) The defrosting control device according to the present invention receives rotational force in a certain direction as the temperature of the temperature sensing part decreases, and receives rotational force in the opposite direction as the temperature of the temperature sensing part increases. Has a response lever. This responsive lever turns on and off the defrosting switch by rotating as described above. Further, a first engaging portion, a second engaging portion, and an adjustment screw are provided at the tip of the responsive lever. For this responsive lever, a first cam surface corresponding to the first engaging portion, a second cam surface corresponding to the second engaging portion, and a third cam surface corresponding to the adjusting screw are provided in common. A cam is installed in parallel to the camshaft. The camshaft is rotationally driven at a constant low speed by a drive mechanism.

ここで、前記第３のカム面は前記カム軸に一体
的に設けられており、かつ前記調整ねじとの接触
により応動レバーを冷凍運転角に保持する山部お
よび除霜運転角に保持する谷部を持つ。また、第
１のカム面も、前記カム軸に一体的に設けられて
おり、かつ前記第３のカム面の山部から谷部への
切換部から所定の遅れ位相角を保つた除霜開始部
までの間、前記応動レバーを、その第１の係合部
との接触により、前記スイツチのオフ状態角に保
つ山部およびこの除霜開始部以降前記応動レバー
を前記スイツチのオン状態角に作動させる谷部を
持つ。さらに第２のカム面は、前記カム軸に対し
回動可能に設けられ、かつこの回動により原点状
態への復帰力が蓄勢されるばねを持つ。また、上
記原点状態において、前記第１のカム面の谷部内
に相当する位置にて前記第２の係合部を係止する
エツジ部を有する。さらにこのエツジ部から、前
記第３のカム面の谷部から山部への切換部までの
間に、前記第２の係合部との接触により応動レバ
ーを前記スイツチのオフ状態角に保つ山部を設け
ている。 Here, the third cam surface is integrally provided on the camshaft, and has a peak portion that holds the responsive lever at the refrigeration operating angle and a valley portion that holds the responsive lever at the defrosting operating angle by contact with the adjusting screw. have a department. Further, the first cam surface is also provided integrally with the camshaft, and the defrosting starts while maintaining a predetermined delay phase angle from the switching portion from the peak to the valley of the third cam surface. The peak part maintains the responsive lever in the off-state angle of the switch by contact with its first engaging part until the start of defrosting, and the responsive lever is kept in the on-state angle of the switch after this defrosting start point. It has a valley to operate. Further, the second cam surface is provided to be rotatable with respect to the camshaft, and has a spring that stores a force for returning to the original state due to this rotation. Further, in the origin state, an edge portion is provided that locks the second engaging portion at a position corresponding to the inside of the trough portion of the first cam surface. Furthermore, between this edge part and the switching part from the valley part to the peak part of the third cam surface, there is a peak which maintains the responsive lever in the off-state angle of the switch by contact with the second engaging part. We have established a department.

（作用）本考案では、カム軸が一定の低速度で回転し、
第３のカム面に接触している調整ねじが、山部か
ら谷部に移行することにより、応動レバーは冷凍
運転角から除霜運転角に変化しようとする。しか
し、移行後しばらくの間は第１の係合部が第１の
カム面の山部に接触しているので応動レバーは除
霜用のスイツチをオフ状態に保つ角度、すなわち
オフ状態角に保持される。しばらくして、第１の
係合部が除霜開始部に達すると、第１の係合部は
第１のカム面の山部から外れ応動レバーは前記ス
イツチをオン動作させる角度、すなわち、オン状
態角に作動する。この動作によりスイツチがオン
状態となり除霜動作が開始される。また、これと
同時に、第２の係合部が第２のカム面のエツジ部
に係止する。このため第２のカム面はその回転が
阻止され、一方カム軸は回転を続けるので、原点
復帰用のばねが蓄勢される。前述した除霜動作に
より感温度の温度が上昇すると応動レバーは前記
スイツチをオフさせる方向の回動力を受ける。こ
の回動力により第２の係合部は第２のカム面のエ
ツジ部から外され、第２のカム面は蓄勢されたば
ね力により原点状態に復帰すべく回動する。この
第２のカム面の回動により第２の係合部は第２の
カム面の山部に接触し、応動レバーはスイツチの
オフ状態角に保持される。したがつて、この後除
霜動作を行うべくスイツチをオンさせようとして
も、この第２のカム面の山部にて阻止され、スイ
ツチの不要なオン・オフ動作の繰返しが防止され
る。(Function) In this invention, the camshaft rotates at a constant low speed,
When the adjustment screw in contact with the third cam surface moves from the peak to the valley, the response lever attempts to change from the freezing operating angle to the defrosting operating angle. However, for a while after the transition, the first engaging part is in contact with the peak of the first cam surface, so the response lever is held at the angle that keeps the defrosting switch in the off state, that is, the off state angle. be done. After a while, when the first engaging part reaches the defrosting start part, the first engaging part is disengaged from the crest of the first cam surface and the responsive lever moves to the angle at which the switch is turned on. It operates according to the state angle. This operation turns the switch on and starts the defrosting operation. At the same time, the second engaging portion engages with the edge portion of the second cam surface. Therefore, the second cam surface is prevented from rotating, while the camshaft continues to rotate, so that the spring for returning to the origin is stored. When the temperature of the sensing temperature rises due to the above-mentioned defrosting operation, the response lever receives a rotational force in the direction of turning off the switch. This rotational force causes the second engaging portion to be disengaged from the edge portion of the second cam surface, and the second cam surface is rotated to return to the original state by the stored spring force. This rotation of the second cam surface brings the second engaging portion into contact with the crest of the second cam surface, and the responsive lever is held at the off-state angle of the switch. Therefore, even if an attempt is made to turn on the switch to perform a defrosting operation thereafter, this is blocked by the mountain portion of the second cam surface, and unnecessary repetition of on/off operations of the switch is prevented.

すなわち、従来のように、カムの別体のストツ
パ機構を用いることなくカムと応動レバーのみに
て機械的な制御を行うことができ、構成が小形化
すると共に、調整作業等も不要となる。 In other words, mechanical control can be performed using only the cam and the responsive lever without using a separate stopper mechanism for the cam as in the prior art, and the structure is downsized and adjustment work, etc., is not required.

（実施例）以下本考案の一実施例を図面を参照して説明す
る。(Example) An example of the present invention will be described below with reference to the drawings.

第１図において、１１は装置本体のフレーム
で、その一端には感温動作用のベローズ１２が取
付けられている。このベローズ１２は図示しない
感温部に通じており、感温部の温度が上昇する
と、内封されたガス体を膨張し、その図示右端押
圧部１２ａを左方に変位させる。また感温部の温
度低下により、収縮し、上記押圧部１２ａを左方
に移動させる。 In FIG. 1, reference numeral 11 denotes a frame of the main body of the apparatus, and a bellows 12 for temperature sensing operation is attached to one end of the frame. The bellows 12 communicates with a temperature-sensing section (not shown), and when the temperature of the temperature-sensing section rises, it expands the gas contained therein and displaces the right end pressing section 12a (illustrated) to the left. Further, due to a decrease in temperature of the temperature sensitive part, it contracts and moves the pressing part 12a to the left.

１４はベローズレバーで、その一端は、上記ベ
ローズ１２の近くに設けられたピ１５を介してフ
レーム１１に回動可能に軸支されている。このベ
ローズレバー１４の上向きに折曲された先端部に
はレンジスプリング１６の一端が係止されてい
る。このレンジスプリング１６の他端はスプリン
グ取付用のナツト１７に取付けられ、さらにこの
ナツト１７は、フレーム１１に頭部が係止された
レンジスクリユー１８螺合している。したがつ
て、ベローズレバー１４は、このレンジスプリン
グ１６により常時図示左廻りの回動力を受けてお
り、かつこの回動力の強さは、レンジスクリユー
１８を捻回操作し、レンジスプリング１６の張力
を調整することにより調節できる。またベローズ
レバー１４の折曲された中間突部１４ａは、前記
ベローズ１２押圧部１２ａに対向して配置され
る。このため、ベローズレバー１４は感温部の温
度上昇に伴い、ベローズ１２の押圧部１２ａに押
圧され、レンジスプリング１６の張力に抗してピ
ン１５を中心に図示右廻りに回動する。また感温
部の温度低下に伴い、レンジスプリング１６の張
力により、上記方向と反対の方向に回動する。 14 is a bellows lever, one end of which is rotatably supported by the frame 11 via a pin 15 provided near the bellows 12. One end of a range spring 16 is locked to the upwardly bent tip of the bellows lever 14. The other end of the range spring 16 is attached to a spring attachment nut 17, and this nut 17 is further threaded into a range screw 18 whose head is secured to the frame 11. Therefore, the bellows lever 14 is constantly receiving a counterclockwise rotational force from the range spring 16, and the strength of this rotational force can be adjusted by twisting the range screw 18 and adjusting the tension of the range spring 16. It can be adjusted by adjusting. Further, the bent intermediate protrusion 14a of the bellows lever 14 is arranged to face the pressing portion 12a of the bellows 12. Therefore, as the temperature of the temperature sensing portion increases, the bellows lever 14 is pressed by the pressing portion 12a of the bellows 12 and rotates clockwise around the pin 15 against the tension of the range spring 16. Further, as the temperature of the temperature sensing section decreases, the tension of the range spring 16 causes it to rotate in the opposite direction to the above direction.

２０は応動レバーで、その一端は前記ピン１５
により、ベローズレバー１４と共に回動可能に軸
支されており、かつこのベローズレバー１４との
当接によりベローズレバー１４から回動力を受け
る。したがつて、応動レバー２０も、感温部の温
度低下により一定方向（図示右廻り）の回動力を
受け、感温部の温度上昇により上記反対方向（図
示左廻り）の回動力を受ける。この応動レバー２
０は、上述した回動により、その図示下方に位置
するスイツチ２１をオン・オフ制御する。すなわ
ち、スイツチ２１は除霜用スイツチおよび冷凍暗
転用スイツチの２つの機能を持つており、応動レ
バー２０の図示左廻りの回動により除霜用スイツ
チとして機能する接点がオンとなり、図示右廻り
の回動により、冷凍運転用のスイツチとして機能
する接点がオンとなる。このスイツチ２１として
は、例えば実開昭55−20137号公報に示されるよ
うなレバーの回動に伴い、接点部が瞬時にオン・
オフ動作するものを用いればよい。 20 is a response lever, one end of which is connected to the pin 15.
It is rotatably supported on the shaft together with the bellows lever 14, and receives a rotational force from the bellows lever 14 through contact with the bellows lever 14. Therefore, the responsive lever 20 also receives a rotational force in a certain direction (clockwise in the figure) due to a decrease in the temperature of the temperature sensing section, and receives a rotational force in the opposite direction (clockwise in the figure) due to an increase in the temperature of the temperature sensing section. This response lever 2
0 controls the on/off of the switch 21 located below in the drawing by the above-mentioned rotation. In other words, the switch 21 has two functions: a defrost switch and a freeze/dark switch, and when the response lever 20 is rotated counterclockwise in the figure, the contact that functions as the defrost switch is turned on, and when the response lever 20 is rotated clockwise in the figure, it turns on. The rotation turns on a contact that functions as a switch for refrigeration operation. This switch 21 has a contact section that instantly turns on and off when a lever is rotated, for example as shown in Japanese Utility Model Application Publication No. 55-20137.
It is sufficient to use one that operates in the OFF state.

また、前記応動レバー２０の先端部には、第２
図で示すように、後述するカム２２との係合用と
して、第１の係合部２０ａと第２の係合部２０ｂ
とを設け、さらに、調整ねじ２３を取付けてい
る。 Further, at the tip of the response lever 20, a second
As shown in the figure, a first engagement portion 20a and a second engagement portion 20b are provided for engagement with a cam 22, which will be described later.
Further, an adjusting screw 23 is attached.

上記カム２２は、第３図で示すように、互いに
個別に構成された第１のカム面２２Ａ、第２のカ
ム面２２Ｂ、第３のカム面２２Ｃを持ち、これら
を共通のカム軸２２Ｄに並設したものである。こ
こで、前記応動レバー２０の第１の係合部２０ａ
は上記第１のカム面２２Ａに対応し、第２の係合
部２０ｂは第２のカム面２２Ｂに対応し、調整ね
じ２３は第３のカム面２２Ｃに対応する如く配置
構成される。またカム軸２２Ｄは、図示しない駆
動モータにより減速ギヤを介して一定の低速で回
転駆動される。 As shown in FIG. 3, the cam 22 has a first cam surface 22A, a second cam surface 22B, and a third cam surface 22C that are configured individually from each other, and these are attached to a common cam shaft 22D. They are installed side by side. Here, the first engaging portion 20a of the responsive lever 20
corresponds to the first cam surface 22A, the second engaging portion 20b corresponds to the second cam surface 22B, and the adjustment screw 23 is arranged so as to correspond to the third cam surface 22C. Further, the camshaft 22D is rotationally driven at a constant low speed by a drive motor (not shown) via a reduction gear.

次に上記カム２２の形状と応動レバー２０との
関係を第３図および第４図により説明する。 Next, the relationship between the shape of the cam 22 and the responsive lever 20 will be explained with reference to FIGS. 3 and 4.

まず、第３のカム面２２Ｃは、冷凍運転と除霜
運転とを切換えるもので、カム軸２２Ｄに一体的
に設けられており、このカム軸２２Ｄと共に回転
する。また、この第３のカム面２２Ｃは、比較的
広範囲の山部２２C₁と、せまい範囲の谷部２２
C₂とからなる。山部２２C₁は、対応する調整ね
じ２３との接触により、応動レバー２０の先端部
を押し下げ、これを冷凍運転角に保持する。また
谷部２２C₁は、調整ねじ２３を介して応動レバ
ー２０の先端部を上昇させ、これを除霜運転角に
保持する。 First, the third cam surface 22C switches between freezing operation and defrosting operation, is provided integrally with the camshaft 22D, and rotates together with the camshaft 22D. Further, this third cam surface 22C has a relatively wide range of peaks _22C1 and a narrow range of valleys 22C.
Consists of C ₂ . The peak portion 22C ₁ pushes down the tip of the response lever 20 by contact with the corresponding adjustment screw 23, and holds it at the refrigeration operating angle. Further, the valley portion 22C ₁ raises the tip of the response lever 20 via the adjustment screw 23 and maintains it at the defrosting operating angle.

次に第１のカム面２２Ａは、同じくカム軸２２
Ｄに一体的に設けられ、このカム軸２２Ｄと共に
回転する。この第１のカム面２２Ａは、対応する
第１の係合部２０ａとの接触により、応動レバー
２０を、前記スイツチ２１のオフ状態角に保持す
る山部２２A₁を持つ。この山部２２A₁は、前記
第３のカム面２２Ｃの山部２２C₁から谷部２２
C₂への切換部２２C₃から、所定の遅れ位相角を
保つた除霜開始部２２A₂まで形成される。また、
この除霜開始部２２A₂以降には、応動レバー２
０を、前記スイツチ２１のオン状態角に作動させ
る谷部２２A₃を設ける。 Next, the first cam surface 22A is also connected to the cam shaft 22
The camshaft 22D is provided integrally with the camshaft 22D and rotates together with the camshaft 22D. This first cam surface 22A has a peak 22A ₁ that holds the responsive lever 20 in the off-state angle of the switch 21 by contact with the corresponding first engaging portion 20a. This peak portion 22A ₁ extends from the peak portion 22C ₁ of the third cam surface 22C to the valley portion 22
It is formed from the switching section 22C ₃ to C ₂ to the defrosting starting section 22A ₂ that maintains a predetermined delay phase angle. Also,
After this defrosting start part 22A ₂ , the response lever 2
0 to the on-state angle of the switch 21 _is provided.

第２のカム面２２Ｂは、カム軸２２Ｄに対し、
回動可能に設けられており、かつ第３図で示すよ
うに、固定側である第３のカム面２２Ｃとの間に
設けられた復帰用のばね２７を持つ。このばね２
７は、第２のカム面２２Ｂがカム軸２２Ｄに対し
て回動すると、原点状態（本来位置すべき状態）
への復帰力を蓄勢する。また、この第２のカム面
２２Ｂは、原点状態において、前記第１のカム面
２２Ａの谷部２２A₃内に相当する位置にエツジ
部２２B₁を持つ。このエツジ部２２B₁は対応す
る第２の係合部２０ｂを係止させるもので、第２
の係合部２０ｂがエツジ部２２B₁に係止すると、
カム軸２２Ｄが回動しても、第２のカム面２２Ｂ
は回転できず、ばね２７は原点状態への復帰力を
蓄勢する。また、このエツジ部２２B₁から、前
記第３のカム面２２Ｃの、谷部２２C₂から山部
２２C₁への切換部２２C₄までの間に、山部２２
B₂を設ける。この山部２２B₂は、第２の係合部
２０ｂとの接触により応動レバー２０を、前記ス
イツチ２１のオフ状態角に保持する。 The second cam surface 22B is arranged so that the second cam surface 22B is
It is rotatably provided, and has a return spring 27 provided between it and the third cam surface 22C, which is the fixed side, as shown in FIG. This spring 2
7, when the second cam surface 22B rotates with respect to the camshaft 22D, the origin state (the state where it should be originally located)
Accumulate the power to return to Further, this second cam surface 22B has an edge portion 22B ₁ at a position corresponding to the valley portion 22A ₃ of the first cam surface 22A in the original state. This edge portion _22B1 is for locking the corresponding second engaging portion 20b, and the second
When the engaging portion 20b of is engaged with the edge portion _22B1 ,
Even if the camshaft 22D rotates, the second cam surface 22B
cannot rotate, and the spring 27 stores the force to return to the original state. Further, between this edge portion 22B ₁ and the switching portion 22C ₄ of the third cam surface 22C from the valley portion 22C ₂ to the peak portion 22C ₁ , the peak portion 22
Provide B ₂ . This peak portion _22B2 holds the responsive lever 20 in the OFF state angle of the switch 21 by contacting with the second engaging portion 20b.

上記構成において、カム２２は常に一定の低速
度で回転しており、所定の冷凍運転時間経過後、
応動レバー２０の先端部に設けた調整ねじ２３
は、第３のカム面２２Ｃのカム山２２C₁から外
れる。このとき図示しない感温部は充分に低温に
なつており、応動レバー２０は図示左廻りの回動
力を受けているので、上記動作により左廻りに回
動する。この回動によりスイツチ２１の冷凍運転
用接点はオフ状態となるが、応動レバー２０の第
１の係合部２０ａが、第４図で示すように、第１
のカム面２２Ａの山部２２A₁に接触しているた
め、除霜用の接点（除霜用スイツチ）をオンする
には至つていない。 In the above configuration, the cam 22 always rotates at a constant low speed, and after a predetermined refrigeration operation time has elapsed,
Adjustment screw 23 provided at the tip of the response lever 20
is removed from the cam crest 22C ₁ of the third cam surface 22C. At this time, the temperature sensing portion (not shown) has reached a sufficiently low temperature, and the response lever 20 is receiving a rotational force in the counterclockwise direction as shown in the figure, so the above operation causes the response lever 20 to rotate counterclockwise. Due to this rotation, the refrigeration operation contact of the switch 21 is turned off, but the first engaging portion 20a of the response lever 20 is in the first position as shown in FIG.
Since it is in contact with the peak _22A1 of the cam surface 22A, the defrosting contact (defrosting switch) cannot be turned on.

その後しばらくして、応動レバー２０の第１の
係合部２０ａが第１のカム面２２Ａの除霜開始部
２２A₂を過ぎると、第２の係合部２０ａは第５
図で示すように山部２２A₁から外れ谷部２２A₃
に落ち込む。この動作により応動レバー２０は、
さらに左廻りに回動し、スイツチ１４の除霜用接
点をオン動作させ、除霜運転が開始する。また、
これと同時に、第２の係合部２０ｂは、対応する
第２のカム面２２Ｂのエツジ部２２B₁に係止す
る。このとき、カム軸２２Ｄは、一定の低速度で
回転し続けるが、第２のカム面２２Ｂはそのエツ
ジ部２２B₁に第２の係合部２０ｂが係合してい
るため回動できず、第３図で示したじね２７が蓄
勢される。 After a while, when the first engaging part 20a of the responsive lever 20 passes the defrosting start part 22A2 of the first cam surface 22A, the second engaging part _20a passes the fifth engaging part 20a.
As shown in the figure, the valley part _22A3 is separated from the peak part _22A1 .
I feel depressed. This action causes the response lever 20 to
It further rotates counterclockwise to turn on the defrosting contact of the switch 14, and defrosting operation begins. Also,
At the same time, the second engaging portion 20b engages with the corresponding edge portion 22B ₁ of the second cam surface 22B. At this time, the camshaft 22D continues to rotate at a constant low speed, but the second cam surface 22B cannot rotate because the second engaging portion _20b is engaged with its edge portion 22B1. The screw 27 shown in FIG. 3 is energized.

この状態において、前記除霜運転により感温部
の温度が上昇するため、応動レバー２０は、スイ
ツチ２１の除霜用接点をオフさせる方向（図示右
廻り）に回動する。この動作により、第２の係合
部２０ｂはエツジ部２２B₁から外される。この
ため第２のカム面２２Ｂは蓄勢されたばね２７に
よる復帰力により左廻りに回動し、第２の係合部
２０ｂは第６図に示すように、第２のカム面２２
Ｂの山部２２B₂に接合する。このため応動レバ
ー２０は除霜用スイツチをオフ状態にする角度に
保持される。このとき、冷凍運転も再開される
が、これにより感温部の急激な温度低下が生じ、
応動レバー２０再び除霜運転方向に回動しようと
するが、前述のように、第２の係合部２０ｂが第
２のカム面２２Ｂの山部２２B₂に接触している
ため、上記回動は阻止される。したがつて、タイ
ムセーフ中における無要な除霜運転を確実に防止
できる。 In this state, the temperature of the temperature sensing section increases due to the defrosting operation, so the response lever 20 rotates in a direction (clockwise in the figure) to turn off the defrosting contact of the switch 21. By this operation, the second engaging portion 20b is removed from the edge portion _22B1 . Therefore, the second cam surface 22B rotates counterclockwise due to the restoring force of the stored spring 27, and the second engaging portion 20b rotates toward the second cam surface 22B as shown in FIG.
It is joined to the peak part _22B2 of B. Therefore, the responsive lever 20 is held at an angle that turns the defrosting switch off. At this time, the refrigeration operation is restarted, but this causes a sudden temperature drop in the temperature sensing part.
The response lever 20 attempts to rotate in the defrosting operation direction again, but as described above, since the second engaging portion 20b is in contact with the peak portion _22B2 of the second cam surface 22B, the rotation is prevented. is prevented. Therefore, unnecessary defrosting operation during time safe can be reliably prevented.

なお、除霜運転によつても感温部の温度が上昇
せず、第５図の状態を維持し続けても所定の除霜
時間経過後は第７図で示すように調整ねじ２３が
対応する第３のカム面の谷部２２C₂から山部２
２C₁への切換部２２C₄に達すると、応動レバー
２０の先端部を強制的に押し下げ、冷凍運転に移
行する。すなわち第６図の過程を経ることなく直
接第７図の状態に移行し、冷凍運転を再開させる
こともできる。 In addition, even if the temperature of the temperature sensing part does not rise during defrosting operation and the state shown in Fig. 5 is maintained, the adjustment screw 23 will adjust as shown in Fig. 7 after the predetermined defrosting time has elapsed. From the valley part _22C2 of the third cam surface to the peak part 2
When reaching the switching part _22C4 to _2C1 , the tip of the response lever 20 is forcibly pushed down, and the operation shifts to freezing operation. That is, it is possible to directly shift to the state shown in FIG. 7 without going through the process shown in FIG. 6, and restart the refrigeration operation.

このようにカム２２の働きにより予定の時間が
経過すると確実に冷凍または除霜運転状態に移行
することができ、動作が安定する。しかも、スイ
ツチ１４のオン・オフ動作の繰返し、それに伴う
無用な除霜運転を機械的に確実に防止できる。さ
らに従来例にように、カムや応動レバーの外に別
体のストツパー部材を設ける必要がないので構造
が小形化し、別部品相互間の調整操作も不要とな
る。 In this manner, the action of the cam 22 allows the device to reliably shift to the freezing or defrosting operation state after the scheduled time has elapsed, thereby stabilizing the operation. In addition, repeated on/off operations of the switch 14 and unnecessary defrosting operations caused by the repeated on/off operations can be mechanically and reliably prevented. Further, unlike in the conventional example, there is no need to provide a separate stopper member in addition to the cam and the response lever, so the structure becomes more compact and adjustment operations between the separate parts are no longer necessary.

なお、第５図乃至第７図で示すように第２のカ
ム面２２Ｂには調整用のピン孔２２B₃が設けら
れ、また第１のカム面２２Ａには半円状の切欠２
２A₄が設けられているが、これらは調整ねじ２
３を操作して作動温度を調整する際に用いる。す
なわち第８図で示すように、上記ピン孔２２B₃
と切欠２２A₄とを一致させ、この間にピン２９
を挿入して第２のカム面２２Ｂを所定の角度に固
定し、前記作動温度の調整に当つて応動レバー２
０を自由に動作できるようにするものである。 As shown in FIGS. 5 to 7, the second cam surface 22B is provided with a pin hole _22B3 for adjustment, and the first cam surface 22A is provided with a semicircular notch 2.
2A ₄ are provided, but these are the adjustment screws 2
3 to adjust the operating temperature. That is, as shown in FIG. 8, the pin hole 22B ₃
and the notch 22A ₄ , and insert the pin 29 between them.
is inserted to fix the second cam surface 22B at a predetermined angle, and when adjusting the operating temperature, the response lever 2
0 can be operated freely.

[Effect of idea]

以上のように本考案によれば、安定かつ確実に
動作し、タイムセーフ時における無用な除霜運転
を確実に防止でき、しかも従来用いていた別体の
ストツプ部材を必要としないので、小形に構成で
き、調整作業を要しないため容易に取扱うことが
できる機械式の除霜制御装置を得ることができ
る。 As described above, according to the present invention, it operates stably and reliably, can reliably prevent unnecessary defrosting operation during time-safe conditions, and does not require a separate stop member, which was conventionally used, so it can be made smaller. It is possible to obtain a mechanical defrost control device that can be configured and easily handled since no adjustment work is required.

[Brief explanation of the drawing]

第１図は本考案による除霜制御装置の一実施例
を示す構成図、第２図ａ，ｂは第１図で示した応
動レバーの平面図および正面図、第３図ａ，ｂは
第１図で示したカムの正面図および側面図、第４
図乃至第７図は第１図で示した装置の動作状態を
表わしており、第４図は除霜直前の状態を示し、
第５図は除霜中の状態を示し、第６図は温度上昇
による除霜の終了状態を示し、第７図は時間によ
る除霜の終了状態を示し、第８図は作動温度の調
整状態を示す図である。１２……感温部に通じるベローズ、２０……応
動レバー、２０ａ……第１の係合部、２０ｂ……
第２の係合部、２１……スイツチ、２２……カ
ム、２２Ａ……第１のカム面、２２Ｂ……第２の
カム面、２２Ｃ……第３のカム面、２３……調整
ねじ、２４，２５……駆動機構を構成する駆動モ
ータおよび減速機構。 Fig. 1 is a configuration diagram showing one embodiment of the defrosting control device according to the present invention, Figs. 2 a and b are a plan view and a front view of the response lever shown in Fig. 1, and Figs. 3 a and b are Front and side views of the cam shown in Figure 1, Figure 4
7 to 7 show the operating state of the device shown in FIG. 1, and FIG. 4 shows the state immediately before defrosting,
Figure 5 shows the state during defrosting, Figure 6 shows the end state of defrost due to temperature rise, Figure 7 shows the end state of defrost depending on time, and Figure 8 shows the state of adjustment of operating temperature. FIG. 12... Bellows leading to the temperature sensing part, 20... Response lever, 20a... First engaging part, 20b...
2nd engaging portion, 21... switch, 22... cam, 22A... first cam surface, 22B... second cam surface, 22C... third cam surface, 23... adjustment screw, 24, 25... A drive motor and a speed reduction mechanism that constitute the drive mechanism.

Claims

[Scope of Claim for Utility Model Registration] A responsive lever that receives a rotational force in a certain direction as the temperature of the temperature-sensing section decreases and a rotational force in the opposite direction as the temperature of the temperature-sensing section increases; a defrosting switch that is controlled on and off, and a first switch provided at the tip of the response lever.
an engaging part, a second engaging part, an adjusting screw, a first cam surface corresponding to the first engaging part, a second cam surface corresponding to the second engaging part, and an adjusting screw. A cam in which corresponding third cam surfaces are arranged in parallel on a common camshaft, and a drive mechanism that rotationally drives the camshaft at a constant low speed, the third cam surface being integral with the camshaft. and has a peak portion that holds the responsive lever at the refrigeration operating angle and a trough portion that holds the responsive lever at the defrosting operating angle by contact with the adjustment screw, and the first cam surface is disposed on the camshaft. integrally provided, and the third
From the switching point from the peak to the valley of the cam surface to the defrosting start point that maintains a predetermined delay phase angle, the switch is turned off by contacting the responsive lever with its first engaging portion. The second cam surface has a peak portion that maintains the switch at an angle and a valley portion that operates the response lever to the on-state angle of the switch after the defrosting start point, and further a second cam surface is rotatably provided with respect to the cam shaft. , and has a spring that accumulates a force for returning to the home position by this rotation, and in the home position, the first
has an edge portion for locking the second engaging portion at a position corresponding to the valley portion of the third cam surface, and from this edge portion to a switching portion from the valley portion to the peak portion of the third cam surface. A defrosting control device characterized in that a mountain portion is provided between the parts of the switch to maintain the responsive lever in the off-state angle of the switch by contact with the second engaging portion.