TWI590777B - Buffer device for fastener chain - Google Patents

Buffer device for fastener chain Download PDF

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Publication number
TWI590777B
TWI590777B TW104104643A TW104104643A TWI590777B TW I590777 B TWI590777 B TW I590777B TW 104104643 A TW104104643 A TW 104104643A TW 104104643 A TW104104643 A TW 104104643A TW I590777 B TWI590777 B TW I590777B
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Taiwan
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processing device
processing
arm
fastener chain
chain
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TW104104643A
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Chinese (zh)
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TW201531254A (en
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萩原英一郎
久世和樹
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Ykk股份有限公司
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    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
    • A44B19/00—Slide fasteners
    • A44B19/42—Making by processes not fully provided for in one other class, e.g. B21D53/50, B21F45/18, B22D17/16, B29D5/00

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  • Attitude Control For Articles On Conveyors (AREA)
  • Control Of Conveyors (AREA)
  • Slide Fasteners (AREA)

Description

牙鏈的緩衝裝置 Chain buffer

本發明涉及一種貯存牙鏈(fastener chain)的緩衝裝置。 The present invention relates to a cushioning device for storing a fastener chain.

作為現有牙鏈的緩衝裝置，眾所周知有如下的有底箱型緩衝裝置，即，在包括對牙鏈依次進行加工的多個加工裝置的牙鏈加工裝置中，分別配置於多個加工裝置之間，且大量地貯存牙鏈(例如參照專利文獻1)。 As a cushioning device for a conventional fastener chain, there is known a bottomed box type cushioning device in which a chain processing device including a plurality of processing devices for sequentially processing a fastener chain is disposed between a plurality of processing devices Further, the fastener chain is stored in a large amount (for example, refer to Patent Document 1).

現有技術文獻 Prior art literature

專利文獻 Patent literature

專利文獻1：日本專利特開平02-074205號公報 Patent Document 1: Japanese Patent Laid-Open No. 02-074205

然而，所述專利文獻1記載的緩衝裝置中，為僅貯存大量牙鏈的類型，因而尺寸大，從而牙鏈加工裝置大型化。 However, in the shock absorber described in Patent Document 1, since only a large number of types of fastener chains are stored, the size is large, and the fastener chain processing apparatus is increased in size.

本發明鑒於所述情況而完成，其目的在於提供一種可將牙鏈加工裝置小型化的牙鏈的緩衝裝置。 The present invention has been made in view of the above circumstances, and an object thereof is to provide a damper device for a fastener chain that can reduce the size of a fastener chain processing device.

本發明的所述目的由下述構成而達成。 The object of the present invention is achieved by the following constitution.

(1)一種牙鏈的緩衝裝置，在多個加工裝置之間貯存牙 鏈，所述牙鏈的緩衝裝置的特徵在於包括：基底部，配置於加工裝置的下方；臂，在上下方向上能夠擺動地支撐於基底部；以及輥，能夠轉動地設置於臂的前端部分且對牙鏈進行引導，並且輥配置於多個加工裝置之間。 (1) A cushioning device for a dental chain, storing teeth between a plurality of processing devices The chain buffer device of the fastener chain includes: a base portion disposed under the processing device; an arm rotatably supported by the base portion in the up and down direction; and a roller rotatably disposed at the front end portion of the arm And guiding the fastener chain, and the roller is disposed between the plurality of processing devices.

(2)根據(1)所述的牙鏈的緩衝裝置，其特徵在於包 括：上限感測器，對臂的上限擺動位置進行檢測；以及下限感測器，對臂的下限擺動位置進行檢測。 (2) The cushioning device for a dental chain according to (1), characterized in that Including: an upper limit sensor that detects the upper swing position of the arm; and a lower limit sensor that detects the lower swing position of the arm.

(3)根據(1)或(2)所述的牙鏈的緩衝裝置，其特徵 在於包括對臂的向下方的擺動進行限制的擋塊。 (3) The cushioning device for a dental chain according to (1) or (2), characterized in that It consists of a stop that limits the downward swing of the arm.

根據本發明，包括：基底部，配置於加工裝置的下方；臂，可在上下方向上擺動地支撐於基底部；以及輥，可轉動地設置於臂的前端部分且對牙鏈進行引導，並且輥配置於多個加工裝置之間，因而能夠以比當前節省空間的構成來貯存牙鏈，並且可使牙鏈加工裝置小型化。 According to the invention, the base portion is disposed below the processing device, the arm is swingably supported by the base portion in the up and down direction, and the roller is rotatably disposed at the front end portion of the arm and guides the fastener chain, and Since the roller is disposed between the plurality of processing apparatuses, the fastener chain can be stored in a configuration that is less space-saving than the current one, and the fastener chain processing apparatus can be miniaturized.

10A‧‧‧第一緩衝裝置 10A‧‧‧First buffer

10B‧‧‧第二緩衝裝置 10B‧‧‧Second buffer

11‧‧‧基底部 11‧‧‧ base

12‧‧‧臂 12‧‧‧ Arm

13‧‧‧輥 13‧‧‧ Roll

14‧‧‧上限感測器 14‧‧‧Upper limit sensor

15‧‧‧下限感測器 15‧‧‧lower limit sensor

16‧‧‧擋塊 16‧‧‧blocks

21、22、23、24‧‧‧引導輥 21, 22, 23, 24‧‧‧ guide rolls

25、26、27‧‧‧進料裝置 25, 26, 27‧‧‧ Feeding device

BT‧‧‧基台 BT‧‧‧Abutment

C‧‧‧牙鏈 C‧‧‧Fracture chain

M1‧‧‧第一加工裝置 M1‧‧‧First processing unit

M2‧‧‧第二加工裝置 M2‧‧‧Second processing unit

M3‧‧‧第三加工裝置 M3‧‧‧ third processing unit

PM‧‧‧牙鏈加工裝置 PM‧‧‧tooth chain processing device

圖1是說明採用了本發明的牙鏈的緩衝裝置的一實施方式的牙鏈加工裝置的概略側視圖。 Fig. 1 is a schematic side view showing a fastener chain processing apparatus according to an embodiment of a cushioning device using a fastener of the present invention.

圖2是圖1所示的緩衝裝置的放大側視圖。 Fig. 2 is an enlarged side elevational view of the shock absorbing device shown in Fig. 1.

圖3是說明緩衝裝置的臂擺動到上限擺動位置的狀態的放大側視圖。 Fig. 3 is an enlarged side elevational view showing a state in which the arm of the shock absorber is swung to the upper limit swing position.

圖4是說明緩衝裝置的臂擺動到下限擺動位置的狀態的放大側視圖。 Fig. 4 is an enlarged side elevational view showing a state in which the arm of the shock absorber is swung to a lower limit swing position.

以下，根據附圖對本發明的牙鏈的緩衝裝置的一實施方式進行詳細說明。另外，以後的說明中，關於牙鏈加工裝置及緩衝裝置，上側為相對於圖1的紙面的上側，下側為相對於圖1的紙面的下側，左側為相對於圖1的紙面的近前側，右側為相對於圖1的紙面的內側，前側為相對於圖1的紙面的左側，後側為相對於圖1的紙面的右側。而且，前側也稱為上游側，後側也稱為下游側。而且，左右方向也稱為寬度方向。 Hereinafter, an embodiment of a damper device for a fastener chain of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the upper side of the fastener processing device and the cushioning device is the upper side with respect to the paper surface of FIG. 1, the lower side is the lower side with respect to the paper surface of FIG. 1, and the left side is close to the paper surface of FIG. The front side, the right side is the inner side with respect to the paper surface of Fig. 1, the front side is the left side with respect to the paper surface of Fig. 1, and the rear side is the right side with respect to the paper surface of Fig. 1. Moreover, the front side is also referred to as the upstream side, and the rear side is also referred to as the downstream side. Moreover, the left and right direction is also referred to as the width direction.

首先，牙鏈加工裝置PM如圖1所示，沿著牙鏈的搬送方向而包括多個加工裝置。根據實施方式，牙鏈加工裝置PM具有3台加工裝置。即，牙鏈加工裝置PM從牙鏈C的搬送方向的上游側起依次包括第一加工裝置M1、第二加工裝置M2、以及第三加工裝置M3。第一加工裝置M1~第三加工裝置M3配置於基台BT上。 First, as shown in FIG. 1, the fastener chain processing apparatus PM includes a plurality of processing apparatuses along the conveyance direction of a fastener chain. According to the embodiment, the dental chain processing device PM has three processing devices. In other words, the fastener processing device PM includes the first processing device M1, the second processing device M2, and the third processing device M3 in this order from the upstream side in the transport direction of the fastener chain C. The first processing device M1 to the third processing device M3 are disposed on the base BT.

而且，牙鏈加工裝置PM包括在多個各加工裝置之間貯存牙鏈的緩衝裝置。根據實施方式，牙鏈加工裝置PM包括在第 一加工裝置M1及第二加工裝置M2之間貯存牙鏈C的第一緩衝裝置10A。而且，牙鏈加工裝置PM包括在第二加工裝置M2及第三加工裝置M3之間貯存牙鏈C的第二緩衝裝置10B。 Further, the chain processing device PM includes a buffer device that stores a fastener chain between a plurality of processing devices. According to an embodiment, the dental chain processing device PM is included in the A first buffer device 10A for storing the fastener chain C between the processing device M1 and the second processing device M2. Further, the fastener chain processing apparatus PM includes a second shock absorbing device 10B that stores the fastener chain C between the second processing apparatus M2 and the third processing apparatus M3.

第一加工裝置M1的週期時間(cycle time)為1.5秒。 第二加工裝置M2的週期時間為2.0秒。第三加工裝置M3的週期時間為2.5秒。另外，週期時間是指各加工裝置M1~加工裝置M3對牙鏈C的1次加工時間。 The cycle time of the first processing device M1 is 1.5 seconds. The cycle time of the second processing device M2 is 2.0 seconds. The cycle time of the third processing device M3 is 2.5 seconds. In addition, the cycle time means the processing time of the fastener chain C of each processing apparatus M1 - the processing apparatus M3.

因此，第三加工裝置M3一直進行驅動。而且，週期時間第二慢的第二加工裝置M2對應週期時間第一慢的第三加工裝置M3的驅動，而斷續地受到驅動。而且，週期時間第一快的第一加工裝置M1對應週期時間第二慢的第二加工裝置M2的驅動，而斷續地受到驅動。 Therefore, the third processing device M3 is always driven. Further, the second processing device M2 having the second slowest cycle time is driven intermittently in response to the driving of the third processing device M3 having the first slowest cycle time. Further, the first processing device M1 having the first cycle time corresponds to the driving of the second processing device M2 having the second slowest cycle time, and is intermittently driven.

第一緩衝裝置10A對第一加工裝置M1及第二加工裝置M2之間貯存的牙鏈C的貯存量進行監視，且對第一加工裝置M1的驅動間隔進行控制。而且，第二緩衝裝置10B對第二加工裝置M2及第三加工裝置M3之間貯存的牙鏈C的貯存量進行監視，且對第二加工裝置M2的驅動間隔進行控制。另外，第一緩衝裝置10A及第二緩衝裝置10B為同樣構造的裝置。 The first buffer device 10A monitors the storage amount of the fastener chain C stored between the first processing device M1 and the second processing device M2, and controls the driving interval of the first processing device M1. Further, the second buffer device 10B monitors the storage amount of the fastener chain C stored between the second processing device M2 and the third processing device M3, and controls the driving interval of the second processing device M2. Further, the first shock absorbing device 10A and the second shock absorbing device 10B are devices having the same configuration.

第一緩衝裝置10A如圖2~圖4所示，配置於第一加工裝置M1的下方。而且，第二緩衝裝置10B配置於第二加工裝置M2的下方。各緩衝裝置10A、緩衝裝置10B包括：基底部11，安裝於基台BT的下表面；臂12，可在上下方向上擺動地支撐於 基底部11；輥13，可轉動地設置於臂12的前端部分且對牙鏈C進行引導；上限感測器14，對臂12的上限擺動位置進行檢測；下限感測器15，對臂12的下限擺動位置進行檢測；以及擋塊16，對臂12的向下方的擺動進行限制以使得臂12不會向比下限擺動位置靠下方擺動。 As shown in FIGS. 2 to 4, the first shock absorbing device 10A is disposed below the first processing device M1. Further, the second shock absorbing device 10B is disposed below the second processing device M2. Each of the buffer device 10A and the buffer device 10B includes a base portion 11 attached to a lower surface of the base BT, and an arm 12 that is swingably supported in the vertical direction. a base portion 11; a roller 13 rotatably disposed at a front end portion of the arm 12 and guiding the fastener chain C; an upper limit sensor 14 for detecting an upper limit swing position of the arm 12; a lower limit sensor 15, a pair of arms 12 The lower limit swing position is detected; and the stopper 16 restricts the downward swing of the arm 12 so that the arm 12 does not swing downward below the lower limit swing position.

而且，第一緩衝裝置10A的輥13配置於第一加工裝置M1及第二加工裝置M2之間，第二緩衝裝置10B的輥13配置於第二加工裝置M2及第三加工裝置M3之間。 Further, the roller 13 of the first shock absorbing device 10A is disposed between the first processing device M1 and the second processing device M2, and the roller 13 of the second buffer device 10B is disposed between the second processing device M2 and the third processing device M3.

而且，上限感測器14與下限感測器15固定於基底部11。 作為所述感測器14、感測器15，優選使用如光電感測器或接近感測器般的非接觸感測器。而且，擋塊16從基底部11突出，且與臂12的下表面相向配置。 Further, the upper limit sensor 14 and the lower limit sensor 15 are fixed to the base portion 11. As the sensor 14 and the sensor 15, a non-contact sensor such as a photo-sensing sensor or a proximity sensor is preferably used. Further, the stopper 16 protrudes from the base portion 11 and is disposed to face the lower surface of the arm 12.

另外，圖1中的符號21~符號24是對牙鏈C的搬送進行引導的引導輥。一對引導輥相對於一個輥13而配置于上方，並且配置於搬送方向的上游側與下游側。而且，輥13將牙鏈C朝向下方按壓。由此，牙鏈C在一對引導輥之間朝向下方而彎曲成U字形。 In addition, reference numerals 21 to 24 in Fig. 1 are guide rollers that guide the conveyance of the fastener chain C. The pair of guide rollers are disposed above the one roller 13 and are disposed on the upstream side and the downstream side in the transport direction. Further, the roller 13 presses the fastener chain C downward. Thereby, the fastener chain C is bent in a U shape toward the downward direction between a pair of guide rollers.

而且，符號25~符號27是在第一加工裝置M1~第三加工裝置M3之間移送牙鏈C的進料裝置。進料裝置包括利用未圖示的電動機進行轉動的驅動輥、以及朝向驅動輥按壓牙鏈C的壓輥。 Further, reference numerals 25 to 27 denote a feeding device that transfers the fastener chain C between the first processing device M1 to the third processing device M3. The feeding device includes a driving roller that is rotated by a motor (not shown), and a pressing roller that presses the fastener chain C toward the driving roller.

如此構成的牙鏈加工裝置PM中，因第一加工裝置M1的 週期時間比第二加工裝置M2快，所以在第一加工裝置M1及第二加工裝置M2對牙鏈C進行加工時，第一加工裝置M1及第二加工裝置M2之間的牙鏈C的貯存量增加。由此，第一緩衝裝置10A的臂12向下方擺動(參照圖4)。而且，如果該臂12被下限感測器15檢測到，則貯存量為最大，停止第一加工裝置M1的加工。 另一方面，繼續進行第二加工裝置M2的加工。 In the fastener chain processing apparatus PM thus constructed, due to the first processing apparatus M1 Since the cycle time is faster than that of the second processing device M2, when the first processing device M1 and the second processing device M2 process the fastener chain C, the storage of the fastener chain C between the first processing device M1 and the second processing device M2 The amount increases. Thereby, the arm 12 of the first shock absorber 10A swings downward (refer to FIG. 4). Moreover, if the arm 12 is detected by the lower limit sensor 15, the amount of storage is maximum, and the processing of the first processing device M1 is stopped. On the other hand, the processing of the second processing device M2 is continued.

此外，牙鏈加工裝置PM中，在第一加工裝置M1的加工 已停止的狀態下，第二加工裝置M2對牙鏈C進行加工，由此貯存在第一加工裝置M1及第二加工裝置M2之間的牙鏈C被朝向下游側移送，牙鏈C的貯存量減少。由此，第一緩衝裝置10A的臂12向上方擺動(參照圖3)。而且，如果該臂12被上限感測器14檢測到，則貯存量為最小，重新開始第一加工裝置M1的加工。 In addition, in the dental chain processing device PM, processing in the first processing device M1 In the stopped state, the second processing device M2 processes the fastener chain C, whereby the fastener chain C stored between the first processing device M1 and the second processing device M2 is transferred toward the downstream side, and the storage of the fastener chain C The amount is reduced. Thereby, the arm 12 of the first shock absorber 10A swings upward (refer to FIG. 3). Moreover, if the arm 12 is detected by the upper limit sensor 14, the amount of storage is minimized, and the processing of the first processing device M1 is resumed.

而且，牙鏈加工裝置PM中，因第二加工裝置M2的週期 時間比第三加工裝置M3快，所以在第二加工裝置M2及第三加工裝置M3對牙鏈C進行加工時，第二加工裝置M2及第三加工裝置M3之間的牙鏈C的貯存量增加。由此，第二緩衝裝置10B的臂12向下方擺動(參照圖4)。而且，如果該臂12被下限感測器15檢測到，則貯存量為最大，停止第二加工裝置M2的加工。另一方面，繼續進行第三加工裝置M3的加工。 Moreover, in the dental chain processing device PM, due to the cycle of the second processing device M2 The time is faster than the third processing device M3, so when the second processing device M2 and the third processing device M3 process the fastener chain C, the storage amount of the fastener chain C between the second processing device M2 and the third processing device M3 increase. Thereby, the arm 12 of the second shock absorber 10B swings downward (refer FIG. 4). Moreover, if the arm 12 is detected by the lower limit sensor 15, the amount of storage is maximum, and the processing of the second processing device M2 is stopped. On the other hand, the processing of the third processing apparatus M3 is continued.

此外，牙鏈加工裝置PM中，在第二加工裝置M1的加工 已停止的狀態下，第三加工裝置M3對牙鏈C進行加工，由此貯存在第二加工裝置M2及第三加工裝置M3之間的牙鏈C向下游側 移送，牙鏈C的貯存量減少。由此，第二緩衝裝置10B的臂12向上方擺動(參照圖3)。而且，如果該臂12被上限感測器14檢測到，則貯存量為最小，重新開始第二加工裝置M2的加工。 In addition, in the dental chain processing device PM, processing in the second processing device M1 In the stopped state, the third processing device M3 processes the fastener chain C, whereby the fastener chain C stored between the second processing device M2 and the third processing device M3 is downstream. Transfer, the storage amount of the fastener chain C is reduced. Thereby, the arm 12 of the second shock absorber 10B swings upward (refer to FIG. 3). Moreover, if the arm 12 is detected by the upper limit sensor 14, the amount of storage is minimized, and the processing of the second processing device M2 is resumed.

另外，第一加工裝置M1~第三加工裝置M3因對1根牙鏈C依次進行加工，所以最終對應週期時間最慢的第三加工裝置M3的驅動，第一加工裝置M1及第二加工裝置M2斷續地受到驅動。 Further, since the first processing device M1 to the third processing device M3 sequentially process one tooth chain C, the first processing device M1 and the second processing device are finally driven in response to the third processing device M3 having the slowest cycle time. M2 is driven intermittently.

如以上說明般，根據本實施方式的緩衝裝置10A、緩衝裝置10B，包括：基底部11，配置於加工裝置M1、加工裝置M2的下方；臂12，可在上下方向上擺動地支撐於基底部11；以及輥13，可轉動地設置於臂12的前端部分且對牙鏈C進行引導，並且輥13配置於多個加工裝置M1~M3之間，因而能夠以比當前節省空間的構成來貯存牙鏈C，由此，可使牙鏈加工裝置PM小型化。 As described above, the damper device 10A and the damper device 10B according to the present embodiment include the base portion 11 disposed below the processing device M1 and the processing device M2, and the arm 12 rotatably supported at the base portion in the vertical direction. 11; and the roller 13, rotatably disposed at the front end portion of the arm 12 and guiding the fastener chain C, and the roller 13 is disposed between the plurality of processing devices M1 to M3, thereby being capable of being stored in a space-saving configuration The fastener chain C can thereby miniaturize the PM of the fastener chain processing apparatus.

而且，根據本實施方式的緩衝裝置10A、緩衝裝置10B，包括：上限感測器14，對臂12的上限擺動位置進行檢測；以及下限感測器15，對臂12的下限擺動位置進行檢測，因而可容易地檢測牙鏈C的貯存量，從而可效率佳地使多個加工裝置M1~加工裝置M3受到驅動。 Further, the buffer device 10A and the buffer device 10B according to the present embodiment include an upper limit sensor 14 that detects an upper limit swing position of the arm 12, and a lower limit sensor 15 that detects a lower limit swing position of the arm 12, Therefore, the storage amount of the fastener chain C can be easily detected, and the plurality of processing apparatuses M1 to M3 can be efficiently driven.

而且，根據本實施方式的緩衝裝置10A、緩衝裝置10B，因包括對臂12的向下方的擺動進行限制的擋塊16，所以可防止臂12向下方過度擺動而輥13與地面等發生接觸。 Further, the damper device 10A and the damper device 10B according to the present embodiment include the stopper 16 that restricts the downward swing of the arm 12, so that the arm 12 can be prevented from excessively swinging downward and the roller 13 comes into contact with the ground or the like.

另外，本發明並不限定於所述實施方式例示的內容，在 不脫離本發明的主旨的範圍內可進行適當變更。 In addition, the present invention is not limited to the contents exemplified in the above embodiments, and Appropriate changes can be made without departing from the spirit of the invention.

例如，本實施方式中，例示了在具有3台加工裝置的牙鏈加工裝置中應用本發明的情況，但並不限定於此，也可在具有2台或4台以上的加工裝置的牙鏈加工裝置中應用本發明。 For example, in the present embodiment, the case where the present invention is applied to a fastener processing device having three processing devices is exemplified, but the present invention is not limited thereto, and a chain of two or more processing devices may be used. The present invention is applied to a processing apparatus.

10A‧‧‧第一緩衝裝置 10A‧‧‧First buffer

10B‧‧‧第二緩衝裝置 10B‧‧‧Second buffer

11‧‧‧基底部 11‧‧‧ base

12‧‧‧臂 12‧‧‧ Arm

13‧‧‧輥 13‧‧‧ Roll

21、22、23、24‧‧‧引導輥 21, 22, 23, 24‧‧‧ guide rolls

25、26、27‧‧‧進料裝置 25, 26, 27‧‧‧ Feeding device

BT‧‧‧基台 BT‧‧‧Abutment

C‧‧‧牙鏈 C‧‧‧Fracture chain

M1‧‧‧第一加工裝置 M1‧‧‧First processing unit

M2‧‧‧第二加工裝置 M2‧‧‧Second processing unit

M3‧‧‧第三加工裝置 M3‧‧‧ third processing unit

PM‧‧‧牙鏈加工裝置 PM‧‧‧tooth chain processing device

Claims (1)

一種牙鏈的緩衝裝置(10A、10B)，在多個加工裝置(M1、M2、M3)之間貯存牙鏈(C)，所述牙鏈的緩衝裝置(10A、10B)的特徵在於包括：基底部(11)，配置於所述加工裝置(M1、M2)的下方；臂(12)，在上下方向上能夠擺動地支撐於所述基底部(11)；輥(13)，能夠轉動地設置於所述臂(12)的前端部分，且對所述牙鏈(C)進行引導，並且所述輥(13)配置於所述多個加工裝置(M1、M2、M3)之間；上限感測器(14)，對所述臂(12)的上限擺動位置進行檢測；下限感測器(15)，對所述臂(12)的下限擺動位置進行檢測；以及對所述臂(12)的向下方的擺動進行限制的擋塊(16)。 A chain buffer device (10A, 10B) for storing a fastener chain (C) between a plurality of processing devices (M1, M2, M3), the chain buffer device (10A, 10B) comprising: a base portion (11) disposed under the processing device (M1, M2); an arm (12) rotatably supported by the base portion (11) in a vertical direction; and a roller (13) rotatably Provided at a front end portion of the arm (12), and guiding the fastener chain (C), and the roller (13) is disposed between the plurality of processing devices (M1, M2, M3); a sensor (14) for detecting an upper swing position of the arm (12); a lower limit sensor (15) for detecting a lower swing position of the arm (12); and for the arm (12) A stop (16) that restricts the downward swing.
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